CN117628631A - Dust raising and removing device for interior decoration - Google Patents

Abstract

The invention relates to the technical field of decoration dust removal, in particular to a dust-raising and dust-removing device for indoor decoration; the dust-raising and dust-removing device for the interior decoration comprises a box body, a dust collection mechanism and a stirring mechanism, wherein the box body is provided with a cavity and an air outlet communicated with the cavity; the dust collection mechanism comprises a dust collection fan, a dust collection assembly arranged at the input end of the dust collection fan and an air outlet assembly arranged at the output end of the dust collection fan, and the air outlet assembly is positioned in the cavity; the stirring mechanism comprises a motor and a stirring assembly, the motor is arranged on the box body, a rotating shaft is arranged at the power output end of the motor and connected with the stirring assembly, the stirring assembly is positioned at the air outlet end of the air outlet assembly and used for cutting air bubbles output by the air outlet assembly, and the dust-raising dust-removing device for indoor decoration can raise dust for timely and effectively treatment, so that the damage to the body of workers is avoided, and meanwhile, the pollution to the district environment is avoided.

Description

Dust raising and removing device for interior decoration

Technical Field

The invention relates to the technical field of decoration dust removal, in particular to a dust-raising and dust-removing device for interior decoration.

Background

In the interior decoration process, a lot of dust can be generated in both new house decoration and old house repair. The dust can not only influence the health of workers, but also fly out of the room through a doorway and a window, so that the environment of a community is influenced to some extent, and the neighborhood is not full. At present, there is no dust removing device specially used for interior decoration, so there is a need for a device capable of treating dust generated during interior decoration to ensure the health of workers and protect the environment of a community.

Disclosure of Invention

(one) solving the technical problems

Aiming at the defects of the prior art, the invention provides the dust-raising and dust-removing device for the interior decoration, which can effectively treat the dust in time, avoid damaging the body of workers and avoid polluting the environment of a community.

(II) technical scheme

To achieve the above object, an embodiment of the present application provides a dust-collecting device for interior decoration, including: the box body is provided with a cavity and an air outlet communicated with the cavity; the dust collection mechanism comprises a dust collection fan, a dust collection assembly arranged at the input end of the dust collection fan and an air outlet assembly arranged at the output end of the dust collection fan, and the air outlet assembly is positioned in the cavity; and the stirring mechanism comprises a motor and a stirring assembly, the motor is arranged on the box body, a rotating shaft is arranged at the power output end of the motor, the rotating shaft is connected with the stirring assembly, and the stirring assembly is positioned at the air outlet end of the air outlet assembly and is used for cutting bubbles output by the air outlet assembly.

In one possible implementation, the air outlet assembly includes: the annular body, the outer lane of the annular body has multiple air inlets evenly, the inner circle of the annular body has annular air outlets; the annular grating plate is arranged at the air outlet of the annular body; the output end of the dust collection fan is provided with a plurality of communicating pipes which penetrate through the side wall of the box body and are respectively communicated with a plurality of air inlets.

In one possible implementation, the air outlet is inclined downwardly, and the stirring assembly is located within the annular body and at the air outlet end of the air outlet.

In one possible implementation manner, a plurality of spray heads are arranged in the annular body, the output ends of the spray heads are opposite to the annular grating plate, a plurality of water inlet tanks are arranged at the top of the annular body, and the water inlet tanks are respectively communicated with the spray heads; the stirring mechanism further comprises a water pushing groove arranged on the rotating shaft, and the water pushing groove is used for pressing water in the cavity into the water inlet groove in the rotating process.

In one possible implementation, the water inlet channel is of an arc-shaped structure, and the water pushing channel is of an arc-shaped structure arranged opposite to the water inlet channel.

In one possible implementation, the agitation assembly includes: the shell is fixed in the cavity; the gear set is arranged in the shell, and the power input end of the gear set is connected with the rotating shaft; the stirring rod penetrates through the shell and is connected with the power output end of the gear set; and the cutting blade is arranged at one end of the stirring rod, which is far away from the gear set, and is positioned at the air outlet end of the air outlet assembly.

In one possible implementation, a guide cover is arranged in the cavity and positioned below the air outlet component; the bottom of annular body is provided with the mud mouth, and the mud mouth is located the bottom of annular grating board.

In one possible implementation, a filter screen is laterally disposed within the cavity, the filter screen being located above the agitation assembly.

In one possible implementation manner, a gas collecting hood is further arranged in the cavity, the gas collecting hood is positioned above the filter screen, and a plurality of annular gas collecting grooves are formed in the bottom of the gas collecting hood; the stirring mechanism further comprises a hairbrush arranged on the rotating shaft, the hairbrush is positioned in the gas collecting tank and used for cleaning gas collected in the gas collecting tank.

In one possible implementation, a vent hole is arranged between two adjacent gas collecting grooves, and the vent hole is used for allowing gas below the gas collecting hood to pass through to the position above the gas collecting hood.

(III) beneficial effects

Compared with the prior art, the invention provides the dust-raising and dust-removing device for the interior decoration, which has the following beneficial effects: this dust collector for interior decoration is through adorning water in the cavity of box, through arranging dust extraction component in the position that produces the raise dust in the fitment process, in leading-in box through the air-out subassembly with the raise dust through dust absorption fan, catch the raise dust granule through water, drive the pivot and stir the subassembly through the motor and rotate, cut the bubble of air-out subassembly derivation into little bubble, be favorable to the raise dust to be caught by water more, the raise dust in the gas is caught the back by water and is discharged through the venthole, can carry out timely effectual processing by the raise dust, avoid causing the injury to workman's health, avoid causing the pollution to district environment simultaneously.

Drawings

Fig. 1 is a schematic perspective view of a dust-collecting device for interior decoration according to an embodiment of the present disclosure;

FIG. 2 shows a schematic view of a partial enlarged structure at A of FIG. 1;

fig. 3 shows a schematic top view of a water pushing tank and a water collecting tank according to an embodiment of the present application;

fig. 4 shows a schematic perspective view of a gas-collecting hood according to an embodiment of the present application;

FIG. 5 shows a schematic perspective view of the other angle of FIG. 4;

fig. 6 shows a schematic perspective view of an annular body and an annular grating plate according to an embodiment of the present application.

The reference numerals in the drawings:

1. a case; 11. an air outlet hole;

2. a dust collection mechanism; 21. a dust collection fan; 211. a communicating pipe; 22. a dust collection assembly; 23. an air outlet assembly; 231. an annular body; 2311. an air inlet; 2312. a mud outlet; 232. annular grating plates; 233. a spray head; 234. a water collection tank;

3. a stirring mechanism; 31. a motor; 32. an agitation assembly; 321. a housing; 322. a gear set; 323. a stirring rod; 324. a cutting blade; 33. a rotating shaft; 34. a water pushing groove; 35. a brush;

4. a guide cover;

5. a filter screen;

6. a gas collecting hood; 61. a gas collecting tank; 62. and a vent hole.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Fig. 1 is a schematic perspective view of a dust-collecting device for interior decoration according to an embodiment of the present disclosure; FIG. 2 shows a schematic view of a partial enlarged structure at A of FIG. 1; fig. 3 shows a schematic top view of a water pushing tank and a water collecting tank according to an embodiment of the present application; fig. 4 shows a schematic perspective view of a gas-collecting hood according to an embodiment of the present application; FIG. 5 shows a schematic perspective view of the other angle of FIG. 4; fig. 6 shows a schematic perspective view of an annular body and an annular grating plate according to an embodiment of the present application.

Referring to fig. 1 to 6, an embodiment of the present application provides a dust-collecting device for interior decoration, including: the dust collection device comprises a box body 1, a dust collection mechanism 2 and a stirring mechanism 3.

The case 1 has a cavity and an air outlet 11 communicating with the cavity. Specifically, box 1 is the barrel structure, and the top of box 1 is provided with the case lid, opens the case lid and can pour into the clear water in the box 1 into, and the bottom of box 1 still is provided with the walking wheel, conveniently removes in the room, still is provided with the handle on the box 1, conveniently carries through the handle.

The dust collection mechanism 2 comprises a dust collection fan 21, a dust collection assembly 22 arranged at the input end of the dust collection fan 21 and an air outlet assembly 23 arranged at the output end of the dust collection fan 21, wherein the air outlet assembly 23 is positioned in the cavity. Specifically, the dust collection assembly 22 comprises a dust collection pipe and a dust collection cover arranged at the end part of the dust collection pipe, wherein the dust collection cover has various specifications and can be replaced according to different construction schemes so as to ensure that dust generated in different construction processes is effectively collected.

The stirring mechanism 3 comprises a motor 31 and a stirring assembly 32, the motor 31 is arranged on the box body 1, a rotating shaft 33 is arranged at the power output end of the motor 31, the rotating shaft 33 is connected with the stirring assembly 32, and the stirring assembly 32 is positioned at the air outlet end of the air outlet assembly 23 and is used for cutting bubbles output by the air outlet assembly 23.

In this application, through the water-logging in the cavity of box 1, through arranging dust collection subassembly 22 in the position that produces the raise dust in the fitment process, in leading-in box 1 through air-out subassembly 23 with the raise dust through dust absorption fan 21, catch the raise dust granule through water, drive pivot 33 and stirring subassembly 32 rotation through motor 31, cut into the tiny bubble with the bubble of air-out subassembly 23 derivation, be favorable to the raise dust to be caught by water more, the raise dust in the gas is caught by water after the back through venthole 11 discharge, can raise dust carry out timely effectual processing, avoid causing the injury to the workman's health, avoid causing the pollution to the district environment simultaneously.

The raise dust for interior decoration has the characteristics of high concentration and concentration, and the volume of the dust removing device is not suitable to be too large, so that the dust removing device is not convenient to carry if the volume is large, and is not convenient to move after water is filled. Therefore, the volume of the dust removing device needs to be portable, because the volume of the box body 1 is limited, a large amount of dust-containing bubbles enter water when the dust suction fan 21 sucks dust, the situation that dust in the dust-containing bubbles is not fully absorbed by water and is discharged out of the box body 1 can occur, and the discharged dust has a certain speed, so that indoor secondary pollution is caused. In order to guarantee to effectively catch the dust of big amount of wind under the less volumetric circumstances of box 1, this application can cut the dust-containing bubble of deriving at stirring subassembly 32, divides into the tiny bubble with the bubble to guarantee the capture effect to the dust.

In some embodiments, the air outlet assembly 23 includes: the annular body 231, the outer ring of the annular body 231 is uniformly provided with a plurality of air inlets 2311, and the inner ring of the annular body 231 is provided with an annular air outlet; and an annular grating plate 232 disposed at the air outlet of the annular body 231; the output end of the dust suction fan 21 is provided with a plurality of communication pipes 211, and the plurality of communication pipes 211 penetrate through the side wall of the case 1 and are respectively communicated with the plurality of air inlets 2311.

In this application, the quantity of air intake 2311 is four, and four communicating pipes 211 communicate with four air intakes 2311 respectively for the dust can get into the aquatic of box 1 through the air outlet after evenly distributed in annular body 231, avoids gas to concentrate and forms the condition of big bubble in box 1, and in passing through annular body 231 to the dust gas lets in the water, can effectively slow down gas moreover, also can improve the capture effect to the dust in the bubble.

Specifically, the communicating pipe 211 is provided with a check valve, so that gas can only flow to the annular body 231 through the check valve, and the condition that water enters the communicating pipe 211 cannot occur, after the dust-containing gas enters the annular body 231, large bubbles are firstly formed in the annular body 231, the bubbles can enter the water body after being divided into small bubbles when passing through the annular grating plate 232, the primary division of the bubbles is realized, and then the led-out bubbles are divided again through the stirring assembly 32, so that the bubbles are cut into smaller bubbles, and the capturing effect on dust is further improved.

In some embodiments, the air outlet is downwardly sloped and the agitation assembly 32 is located within the annular body 231 and at the air outlet end of the air outlet.

In this application, through setting up the air outlet downward sloping for the bubble of deriving behind annular grating board 232 can continue slant downwardly moving a section distance on the basis of initial velocity, is cut by stirring subassembly 32 and upwards floats again, has increased the removal displacement of bubble in box 1, has further improved the capture effect to the dust under the condition of the same degree of depth water.

In some embodiments, a plurality of spray heads 233 are disposed in the annular body 231, output ends of the plurality of spray heads 233 face the annular grid plate 232, a plurality of water inlet grooves 234 are disposed at the top of the annular body 231, and the plurality of water inlet grooves 234 are respectively communicated with the plurality of spray heads 233; the stirring mechanism 3 further comprises a water pushing groove 34 arranged on the rotating shaft 33, wherein the water pushing groove 34 is used for pressing water in the cavity into the water inlet groove 234 in the rotating process.

In this application, pivot 33 drives the push away basin 34 and rotates, through the cooperation of push away basin 34 and intake groove 234, in pressing into intake groove 234 with water intermittent type nature, the water in intake groove 234 passes through shower nozzle 233 blowout, can further separate the bubble that gets into in the annular body 231, and shower nozzle 233 spun water can also clear up the rubbish that annular grid board 232 inboard is attached, avoids the impurity to be attached at the surface of annular grid board 232.

Specifically, a primary filtering piece is arranged in the water inlet tank 234, water entering the water inlet tank 234 is filtered, the phenomenon that impurities block the spray head 233 is avoided, the spray holes of the spray head 233 are not required to be too small, the primary function is to clean the annular grating plate 232, and the auxiliary function is to impact bubbles to enable the bubbles to break.

In some embodiments, the water inlet channel 234 is an arcuate structure and the water pushing channel 34 is an arcuate structure disposed opposite the water inlet channel 234.

In this application, intake channel 234 and push away basin 34 set up into relative arc structure, push away basin 34 and rotate along with pivot 33, can drive the water rotation at pivoted in-process, after water gets into intake channel 234 back water still has certain speed, thereby make water pass through shower nozzle 233 blowout, the next water gets into intake channel 234 again after the blowout, thereby realize carrying out intermittent type nature in the annular body 231 and wash in the twinkling of an eye, make shower nozzle 233 spun water have great kinetic energy, and then guarantee the impact effect to the bubble and to annular grating 232's clearance effect.

In some embodiments, the agitation assembly 32 includes: a housing 321 fixed in the cavity; the gear set 322 is arranged in the shell 321, and the power input end of the gear set 322 is connected with the rotating shaft 33; a stirring rod 323 passing through the housing 321 and connected with the power output end of the gear set 322; and a cutting blade 324, which is disposed at one end of the stirring rod 323 far away from the gear set 322, wherein the cutting blade 324 is located at the air outlet end of the air outlet assembly 23.

In this application, casing 321 is located the centre of box 1, and casing 321 is fixed through periphery side branch, forms a relatively airtight space in the casing 321, and gear train 322 does not receive the pollution of outside clear water and impurity in casing 321, and pivot 33 passes through gear train 322 with power transmission for puddler 323 drives cutting blade 324 fast rotation, cuts again air outlet spun bubble.

Specifically, the gear set 322 includes a first conical wheel and a second conical wheel, the first conical wheel is connected with the rotating shaft 33, the second conical wheel is connected with the stirring rod 323, and the first conical wheel is meshed with the second conical wheel, so that power transmission is realized, the position of the cutting blade 324 in the box body 1 is fixed, and the cutting blade is always located at the air outlet, so that the cutting effect of guiding out bubbles at the air outlet is ensured.

In some embodiments, a guide cover 4 is arranged in the cavity, and the guide cover 4 is positioned below the air outlet assembly 23; the bottom of the annular body 231 is provided with a mud outlet 2312, and the mud outlet 2312 is located at the bottom of the annular grating plate 232.

In this application, kuppe 4 is used for carrying out the water conservancy diversion to the dust of catching, with impurity water conservancy diversion to the below of kuppe 4, and kuppe 4 is with the water in the cavity into the water of upper portion and the water of lower part, and upper portion's water not only has the bubble and stirs in addition, is unfavorable for the deposit of impurity, and lower part's water does not have the bubble and stirs for the impurity that gets into kuppe 4 below is difficult for being turned up, and the inside of annular body 231 also can detain a part impurity, and this part impurity is exported through play mud mouth 2312 then flows to kuppe 4 on, flows to the below of kuppe 4 along kuppe 4.

In some embodiments, a filter 5 is disposed laterally within the cavity, the filter 5 being located above the agitation assembly 32.

In this application, can cut once more the bubble that rises in the cavity through filter screen 5, further improve the capture effect to the impurity, can also filter the impurity of aquatic moreover for the impurity is below filter screen 5.

In some embodiments, a gas collecting hood 6 is further arranged in the cavity, the gas collecting hood 6 is positioned above the filter screen 5, and a plurality of annular gas collecting grooves 61 are formed in the bottom of the gas collecting hood 6; the stirring mechanism 3 further comprises a brush 35 arranged on the rotating shaft 33, wherein the brush 35 is positioned in the gas collecting groove 61 and is used for cleaning the gas collected in the gas collecting groove 61.

In this application, when the amount of wind is great, there is in some bubbles gets into the gas collecting channel 61 of gas collecting channel 6, overflows again after the gas in the gas collecting channel 61 fills up, drives the brush 35 through pivot 33 and rotates, can adsorb the impurity in the gas that is located in the gas collecting channel 61 for the impurity can mix in the aquatic.

Specifically, the brush 35 can drive water to flow in the gas collecting tank 61 in the rotating process, the flowing water can continuously wash the brush 35, impurities on the brush 35 are washed away, the wet brush 35 adsorbs impurities in the gas collecting tank 61 again, and the impurities in the air bubbles in the gas collecting tank 61 are adsorbed and cleaned in a circulating manner, so that the cleaning effect on the impurities is further improved.

In some embodiments, a vent hole 62 is provided between two adjacent gas collecting channels 61, and the vent hole 62 allows gas below the gas collecting hood 6 to pass through to above the gas collecting hood 6.

In this application, after the gas in the gas collecting hood 6 is accumulated to a certain extent, the gas overflows to the upper part of the gas collecting hood 6 through the vent holes 62 between the two gas collecting grooves 61, and then the bubbles are separated from the water surface and discharged through the gas outlet holes 11.

The dust collector is used for cleaning dust in the interior decoration process, and is portable and convenient to move through a small volume. Through arranging dust collection assembly 22 in the position that produces the raise dust in the fitment process, in leading-in box 1 through air-out subassembly 23 with the raise dust through dust absorption fan 21, catch the raise dust granule through water, drive pivot 33 and stir subassembly 32 rotation through motor 31, cut the bubble of air-out subassembly 23 derivation into the tiny bubble, be favorable to the raise dust to catch by water more, the raise dust in the gas is caught the back by water and is discharged through venthole 11, can the raise dust go on in time effectual processing, avoid causing the injury to the workman's health, avoid causing the pollution to the district environment simultaneously.

It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

It should be readily understood that the terms "on … …", "above … …" and "above … …" in this disclosure should be interpreted in the broadest sense such that "on … …" means not only "directly on something", but also includes "on something" with intermediate features or layers therebetween, and "above … …" or "above … …" includes not only the meaning "on something" or "above" but also the meaning "above something" or "above" without intermediate features or layers therebetween (i.e., directly on something).

Further, spatially relative terms, such as "below," "beneath," "above," "over," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The utility model provides a raise dust collector for interior decoration which characterized in that includes:

the box body (1) is provided with a cavity and an air outlet hole (11) communicated with the cavity;

the dust collection mechanism (2) comprises a dust collection fan (21), a dust collection assembly (22) arranged at the input end of the dust collection fan (21) and an air outlet assembly (23) arranged at the output end of the dust collection fan (21), wherein the air outlet assembly (23) is positioned in the cavity; and

the stirring mechanism (3) comprises a motor (31) and a stirring assembly (32), wherein the motor (31) is arranged on the box body (1), a rotating shaft (33) is arranged at the power output end of the motor (31), the rotating shaft (33) is connected with the stirring assembly (32), and the stirring assembly (32) is positioned at the air outlet end of the air outlet assembly (23) and used for cutting air bubbles output by the air outlet assembly (23).

2. A dust collector for interior decoration as set forth in claim 1, wherein said air outlet assembly (23) comprises:

the annular body (231), wherein a plurality of air inlets (2311) are uniformly formed in the outer ring of the annular body (231), and an annular air outlet is formed in the inner ring of the annular body (231); and

an annular grating plate (232) provided at the air outlet of the annular body (231);

the output end of the dust collection fan (21) is provided with a plurality of communicating pipes (211), and the communicating pipes (211) penetrate through the side wall of the box body (1) and are respectively communicated with the air inlets (2311).

3. A dust collector for interior decoration as set forth in claim 2 wherein said air outlet is downwardly inclined and said agitation assembly (32) is located within said annular body (231) at the air outlet end of said air outlet.

4. A dust collector for interior decoration according to claim 3, wherein a plurality of nozzles (233) are provided in the annular body (231), the output ends of the plurality of nozzles (233) are opposite to the annular grid plate (232), a plurality of water inlet grooves (234) are provided at the top of the annular body (231), and the water inlet grooves (234) are respectively communicated with the plurality of nozzles (233);

the stirring mechanism (3) further comprises a water pushing groove (34) arranged on the rotating shaft (33), and the water pushing groove (34) is used for pressing water in the cavity into the water inlet groove (234) in the rotating process.

5. The dust collector for interior decoration of claim 4, wherein the water inlet channel (234) has an arc-shaped structure, and the water pushing channel (34) has an arc-shaped structure opposite to the water inlet channel (234).

6. A dust collector for interior decoration as set forth in claim 2, wherein said agitation assembly (32) comprises:

a housing (321) secured within the cavity;

the gear set (322) is arranged in the shell (321), and the power input end of the gear set (322) is connected with the rotating shaft (33);

a stirring rod (323) which passes through the shell (321) and is connected with the power output end of the gear set (322); and

the cutting blade (324) is arranged at one end, far away from the gear set (322), of the stirring rod (323), and the cutting blade (324) is positioned at the air outlet end of the air outlet assembly (23).

7. The dust-raising and dust-removing device for interior decoration according to claim 6, wherein a guide cover (4) is arranged in the cavity, and the guide cover (4) is positioned below the air outlet assembly (23);

the bottom of annular body (231) is provided with mud mouth (2312), mud mouth (2312) are located the bottom of annular grid board (232).

8. The dust-raising and dust-removing device for interior decoration according to claim 1, wherein a filter screen (5) is transversely arranged in the cavity, and the filter screen (5) is positioned above the stirring assembly (32).

9. The dust-raising and dust-removing device for interior decoration according to claim 8, wherein a gas-collecting hood (6) is further arranged in the cavity, the gas-collecting hood (6) is positioned above the filter screen (5), and a plurality of annular gas-collecting grooves (61) are formed in the bottom of the gas-collecting hood (6);

the stirring mechanism (3) further comprises a hairbrush (35) arranged on the rotating shaft (33), and the hairbrush (35) is positioned in the gas collecting groove (61) and used for cleaning gas collected in the gas collecting groove (61).

10. The dust-collecting device for interior decoration according to claim 9, wherein a vent hole (62) is provided between two adjacent gas collecting grooves (61), and the vent hole (62) allows the gas below the gas collecting hood (6) to pass through to above the gas collecting hood (6).