CN112833412A

CN112833412A - Environment-friendly flue gas purification equipment for waste incineration

Info

Publication number: CN112833412A
Application number: CN202110097662.5A
Authority: CN
Inventors: 王雪明
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-25
Filing date: 2021-01-25
Publication date: 2021-05-25

Abstract

The invention discloses an environment-friendly flue gas purification device for waste incineration, which comprises an absorption tank, a propeller, a filter screen, a purification tank, blades, bristles and a filter element, wherein a smoke inlet pipe is connected in the middle of the left side of the absorption tank, a shunt pipe is arranged above the smoke inlet pipe, the bottom of the absorption tank is provided with the filter screen, the left end and the right end of the filter screen are provided with collection bins, the bottom of the absorption tank is provided with a servo motor, the propeller is arranged above the servo motor, a spiral plate is arranged in the middle of a rotating shaft, and the bristles are arranged on the outer side of. This environment-friendly flue gas purification equipment for msw incineration is provided with pivot and brush hair, and when the flue gas got into the filter core, through the effect of air current, it is rotatory to promote the blade to drive the pivot rotatory, the pivot is at rotatory in-process, makes the brush hair constantly absorbent dust on the clearance filter core, thereby guarantees the filter effect of filter core, improves purification efficiency, has increased the device's functionality.

Description

Environment-friendly flue gas purification equipment for waste incineration

Technical Field

The invention relates to the technical field of flue gas evolution, in particular to an environment-friendly flue gas purification device for waste incineration.

Background

Along with the continuous development of society, more and more garbage is manufactured by people, in order to protect the environment, the garbage needs to be collected and treated, one traditional mode for treating the garbage is direct combustion, the garbage is treated by an incineration method, the reduction effect is obvious, the land is saved, various pathogens can be eliminated, toxic and harmful substances are converted into harmless substances, the heat generated during the incineration of the garbage can be utilized for generating electricity, the generated electric energy can be used by residents, the economic benefit is improved, the utilization maximization of the waste is achieved, the incineration of the garbage becomes an important component of circular economy, in addition, in the recycling and processing process of waste resources and waste materials, the problem of resource shortage is solved, the garbage emission is reduced, the urban environment is beautified, in the continuous development process of cities, the garbage as a product of urban metabolism is once developed in cities, many cities in the world have a situation of enclosing the cities by the garbage, and nowadays, the garbage is regarded as the inexhaustible 'urban mineral deposit' with the most development potential and is the 'resource misplaced', which is both deep and deepened understanding of the garbage and is the inevitable requirement of urban development, so that a garbage incineration method becomes one of the main methods for treating the urban garbage, but simple open-air incineration generates a large amount of toxic gas to pollute the atmosphere and soil, so the garbage is generally put into a special incinerator for incineration treatment, the incinerator is generally provided with a smoke purification device to purify the harmful gas generated by incineration and then discharge the harmful gas into the atmosphere, but the traditional smoke purification device has reduced purification efficiency after being used for a period of time, and the filtering and adsorbing material needs to be frequently replaced during operation, thereby greatly improving the use cost, through using the manual work to clear up purifier after reuse, also can be very big when frequent dismantlement installation reduce work efficiency, make the maintenance cost increase by a wide margin simultaneously.

Therefore, an environment-friendly flue gas purification device for waste incineration is provided, so as to solve the problems that after the traditional flue gas purification device provided in the above is used for a period of time, the purification efficiency is reduced, manual cleaning is needed, the working efficiency is reduced, and the maintenance cost is increased.

Disclosure of Invention

The invention aims to provide an environment-friendly flue gas purification device for waste incineration, which aims to solve the problems that the traditional flue gas purification device in the market reduces the purification efficiency after being used for a period of time, and needs manual cleaning, thereby reducing the working efficiency and increasing the maintenance cost.

In order to achieve the purpose, the invention provides the following technical scheme: an environment-friendly flue gas purification device for waste incineration comprises an absorption tank, a propeller, a filter screen, a purification tank, blades, bristles and a filter element, wherein a smoke inlet pipe is connected in the middle of the left side of the absorption tank, a shunt pipe is arranged above the smoke inlet pipe, an atomization nozzle is arranged on the inner side of the shunt pipe, the atomization nozzle is connected with a water pump motor through a water pipe, the water pump motor is connected with a pump body through a water pipe, the pump body is arranged at the bottom of the absorption tank, the bottom of the absorption tank is provided with the filter screen, the left end and the right end of the filter screen are provided with collection bins, bin doors are arranged at the lower ends of the collection bins, a servo motor is arranged at the bottom of the absorption tank, the propeller is arranged above the servo motor, a demister is arranged above the propeller, the top end of the, it has the roof to advance the first lower extreme of cigarette cover through the screw connection, and the roof upper surface has seted up the seal groove to install the sealing washer in the seal groove, be provided with the support frame in the middle of the roof, and install the pivot through the second bearing in the middle of the support frame, and install the blade on the pivot, install the spiral plate in the middle of the pivot, and the spiral plate outside is provided with the brush hair, the roof lower extreme is connected with the bottom plate through the support column, and is provided with the filter core in the support column inboard, the ash discharge pipe is installed to the bottom plate below, and the ash discharge pipe lower extreme installs the ash discharge valve to the ash discharge valve lower extreme is installed and is collected the ash box, the.

Preferably, the number of the atomizing nozzles is 6, the atomizing nozzles are rotationally symmetrical relative to the center line of the shunt pipe, and the center line of the shunt pipe and the center line of the absorption tank are coincident with each other.

Preferably, the surface plane of the propeller is electroplated with a silver ion coating, a sponge ring is arranged around the propeller, and the maximum outer diameter of the sponge ring is equal to the inner diameter of the absorption tank.

Preferably, the central line of the collecting bin and the central line of the filter screen are overlapped, and the central line of the collecting bin and the central line of the absorption tank are overlapped.

Preferably, the central line of the smoke inlet hood head and the central line of the purification tank are overlapped, and the central line of the smoke inlet hood head and the central line of the ash discharge pipe are overlapped.

Preferably, the center line of the top plate and the center line of the bottom plate are coincident with each other, and the surface plane of the top plate and the surface plane of the bottom plate are parallel to each other.

Preferably, the central line of the rotating shaft and the central line of the top plate are overlapped, and the central line of the rotating shaft and the central line of the filter element are overlapped

Preferably, the rotating center line of the blade and the center line of the smoke inlet hood head are overlapped, and the rotating center line of the blade and the shaft axis of the rotating shaft are overlapped.

Preferably, the central line of the filter element and the rotation central line of the bristles are coincident with each other, and the inner diameter of the filter element is equal to the rotation diameter of the bristles.

Compared with the prior art, the invention has the beneficial effects that: the environment-friendly flue gas purification equipment for waste incineration;

1. the device is provided with the propeller and the silver ion coating, smoke particles can be brought onto the filter screen through rotation of the propeller in the actual use process, the silver ion coating on the surface of the propeller can be fully contacted with smoke in the rotation process of the propeller to sterilize the smoke and reduce virus propagation, the propeller can adsorb the smoke particles when rotating, the adsorbed smoke particles flow to the filter screen under the action of water vapor, meanwhile, the smoke particles on the filter screen can be pushed into the collection bin when the propeller rotates, the filtering performance of the filter screen is constantly kept, and the practicability of the device is improved;

2. the rotary shaft and the bristles are arranged, in the actual use process, when smoke enters the filter element, the blades are pushed to rotate under the action of air flow, so that the rotary shaft is driven to rotate, and in the rotating process of the rotary shaft, the bristles continuously clean dust adsorbed on the filter element, so that the filtering effect of the filter element is ensured, the purification efficiency is improved, and the functionality of the device is improved;

3. be provided with fan and blade, in the in-service use process, constantly take out through the flue gas after the fan will purify the jar interior filtration, improve the air flow rate in the jar, make the flue gas when getting into the filter core, it constantly rotates to drive the blade, thereby provide power for the pivot, make the pivot drive the automatic filter core inner wall of clearing up of brush hair, make the filter core keep best filtration state, and the rotational speed of rotational speed adjustment blade through control fan, thereby the cleaning efficiency of control brush hair, the controllability of the device has been increased.

Drawings

FIG. 1 is a schematic view of the main sectional structure of the present invention;

FIG. 2 is a schematic view of the connection structure of the screw and the scraper according to the present invention;

FIG. 3 is a schematic view of a connection structure of the top plate and the supporting frame according to the present invention;

FIG. 4 is a schematic view of the connection structure of the bottom plate and the filter element according to the present invention;

FIG. 5 is an enlarged view of the structure at A in FIG. 1 according to the present invention;

FIG. 6 is an enlarged view of the structure at B in FIG. 2 according to the present invention.

In the figure: 1. an absorption tank; 2. a smoke inlet pipe; 3. an atomizing spray head; 4. a demister; 5. a water pipe; 6. a water pump motor; 7. a pump body; 8. a propeller; 9. a filter screen; 10. a collection bin; 11. a bin gate; 12. a servo motor; 13. a silver ion coating; 14. a sponge ring; 15. a shunt tube; 16. a connecting pipe; 17. a smoke inlet hood head; 18. a screw; 19. a seal ring; 20. a purification tank; 21. a top plate; 22. a sealing groove; 23. a support frame; 24. a second bearing; 25. a rotating shaft; 26. a blade; 27. a spiral plate; 28. brushing; 29. a filter element; 30. a support pillar; 31. a base plate; 32. an ash discharge pipe; 33. an ash discharge valve; 34. a dust collecting box; 35. an exhaust duct; 36. a fan.

Detailed Description

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

Referring to fig. 1-6, the present invention provides a technical solution: an environment-friendly flue gas purification device for waste incineration comprises an absorption tank 1, a smoke inlet pipe 2, an atomizing nozzle 3, a demister 4, a water pipe 5, a water pump motor 6, a pump body 7, a propeller 8, a filter screen 9, a collection bin 10, a bin door 11, a servo motor 12, a silver ion coating 13, a sponge ring 14, a shunt pipe 15, a connecting pipe 16, a smoke inlet cover head 17, a screw 18, a sealing ring 19, a purification tank 20, a top plate 21, a sealing groove 22, a support frame 23, a second bearing 24, a rotating shaft 25, blades 26, a spiral plate 27, brush bristles 28, a filter core 29, a support column 30, a bottom plate 31, an ash discharge pipe 32, an ash discharge valve 33, an ash collection box 34, an exhaust pipe 35 and a fan 36, wherein the smoke inlet pipe 2 is connected to the middle of the left side of the absorption tank 1, the shunt pipe 15 is arranged above the smoke inlet pipe 2, the atomizing nozzle 3 is arranged on, the water pump motor 6 is connected with a pump body 7 through a water pipe 5, the pump body 7 is arranged at the bottom of the absorption tank 1, the bottom of the absorption tank 1 is provided with a filter screen 9, the left end and the right end of the filter screen 9 are provided with collection bins 10, the lower end of the collection bin 10 is provided with a bin door 11, the bottom of the absorption tank 1 is provided with a servo motor 12, a screw propeller 8 is arranged above the servo motor 12, a demister 4 is arranged above the screw propeller 8, the top end of the absorption tank 1 is connected with a connecting pipe 16, the right end of the connecting pipe 16 is connected with a smoke inlet hood head 17, a purification tank 20 is arranged outside the smoke inlet hood head 17, the lower end of the smoke inlet hood head 17 is connected with a top plate 21 through a screw 18, the upper surface of the top plate 21 is provided with a sealing groove 22, a sealing ring 19 is arranged in the sealing, install the spiral plate 27 in the middle of the pivot 25, and the spiral plate 27 outside is provided with brush hair 28, and roof 21 lower extreme is connected with bottom plate 31 through support column 30, and the support column 30 inboard is provided with filter core 29, and ash discharge pipe 32 is installed to bottom plate 31 below, and ash discharge pipe 32 lower extreme installs ash discharge valve 33 to ash discharge valve 33 lower extreme installs ash collection box 34, and purification can 20 below is connected with exhaust pipe 35, and exhaust pipe 35 is connected with fan 36.

Atomizer 3 is provided with 6, and atomizer 3 is for shunt tubes 15's central line rotational symmetry to shunt tubes 15's central line and the mutual coincidence of the central line of absorption tank 1, above-mentioned structural design, in the in-service use process, be favorable to improving the degree of consistency that sprays the scope and spray, improve the cleanliness factor to the surface cleaning of screw 8 simultaneously, improve cleaning efficiency.

Screw 8's surface plane is electroplated with silver ion coating 13, and screw 8 installs sponge circle 14 all around, and the biggest external diameter of sponge circle 14 equals with the internal diameter of absorption tank 1, above-mentioned structural design, in the in-service use process, be favorable to driving dust particulate matter downstream through screw 8's rotation, and constantly contact with silver ion coating 13 at removal in-process flue gas, thereby disinfect when carrying out absorption to particulate matter in the flue gas, and make sponge circle 14 clear up the inner wall of absorption tank 1 through screw 8's rotation, and screw 8 is at the rotation in-process, be convenient for push the collection storehouse 10 with the continuous push of smoke and dust impurity on the filter screen 9 in, be convenient for keep the filtering quality of filter screen 9.

The central line of collecting storehouse 10 and the central line of filter screen 9 coincide each other, and the central line of collecting storehouse 10 and the central line of absorption tank 1 coincide each other, above-mentioned structural design, in the in-service use, be favorable to rotating the in-process at screw 8, the continuous smoke and dust granule that will be pushed out by screw 8 is collected, is convenient for concentrate the collection in unison to the smoke and dust granule, has reduced the clearance number of times, has improved work efficiency.

The central line of advancing cigarette cover head 17 and the central line of purifying tank 20 coincide each other, and the central line that advances cigarette cover head 17 and the central line of ash discharge pipe 32 coincide each other, above-mentioned structural design, in the in-service use process, be favorable to the flue gas to filter in advancing cigarette cover head 17 gets into filter core 29, improve the equilibrium when flue gas passes through filter core 29, improve filtration efficiency.

The central line of roof 21 and the central line of bottom plate 31 coincide each other, and the surface plane of roof 21 and the surface plane of bottom plate 31 are parallel to each other, and above-mentioned structural design is favorable to the central line of filter core 29 and the central line of pivot 25 to keep coinciding in actual use, and the pivot 25 of being convenient for drives brush hair 28 and clears up filter core 29, improves the stability when pivot 25 rotates.

The central line of the rotating shaft 25 and the central line of the top plate 21 are overlapped, and the central line of the rotating shaft 25 and the central line of the filter element 29 are overlapped, so that the structural design is beneficial to the free rotation of the bristles 28 in the filter element 29 in the actual use process, the filter element 29 is automatically cleaned in the rotation process of the bristles 28, and the filtering efficiency of the filter element 29 is kept.

The rotation center line of blade 26 and the central line of advancing cigarette cover head 17 coincide each other, and the rotation center line of blade 26 and the axial lead of pivot 25 coincide each other, above-mentioned structural design, in the in-service use process, be favorable to through the impact of air current to blade 26 for blade 26 rotates, thereby drives pivot 25 and rotates, effectively utilizes the energy of flue gas to realize automatic clearance function, has practiced thrift the energy simultaneously.

The central line of filter core 29 and the rotation center line of brush hair 28 coincide each other, and the internal diameter of filter core 29 equals the rotating diameter of brush hair 28, and above-mentioned structural design is in the in-service use in-process, is favorable to brush hair 28 can free rotation in filter core 29, avoids brush hair 28 dead or brush hair 28 not contacting filter core 29 at filter core 29 card, and reduces the clearance effect, has guaranteed the reliability when brush hair 28 automatic clearance.

The working principle is as follows: when the environment-friendly flue gas purification device for waste incineration is used, as shown in fig. 1 and 2, firstly, flue gas generated after waste incineration enters the absorption tank 1 from the smoke inlet pipe 2, then the water pump motor 6 is turned on, the water pump motor 6 sends water into the water pipe 5 through the pump body 7, the water is sequentially sent into the atomizing spray heads 3 through the flow dividing pipes 15, then the atomizing spray heads 3 are turned on, the water in the water pipe 5 is sprayed in a mist shape by the atomizing spray heads 3, so that the atomized water is sprayed on the flue gas entering the absorption tank 1 from the smoke inlet pipe 2, a large amount of water vapor is condensed on the surfaces of large fly ash particles in the flue gas, the large amount of water vapor is continuously condensed through condensation of the water vapor, the fly ash particles finally fall onto the surface of the filter screen 9 under the action of gravity, and the water vapor adsorbed on the surfaces of the particles returns to the bottom of the, larger fly ash particles are continuously accumulated on the surface of the filter screen 9, when the fly ash particles on the surface of the filter screen 9 are gathered to a certain degree, as shown in fig. 2 and fig. 6, the servo motor 12 is simultaneously turned on, the servo motor 12 drives the propeller 8 to rotate, the particles in the flue gas downwards move to fall onto the filter screen 9 through the rotation of the propeller 8, and the propeller 8 makes the flue gas contact with the silver ion coating 13 in the rotating process, thereby disinfecting the flue gas and improving the safety of the discharged gas, meanwhile, in the spraying of the atomizing nozzle 3, the surface of the propeller 8 is sprayed with water vapor, the particles in the flue gas can be adsorbed while the propeller 8 rotates, the adsorbed particles flow onto the filter screen 9 along the propeller 8, and in the rotating process of the propeller 8, the smoke particles filtered by the filter screen 9 can be continuously pushed into the collection bin 10, the filtering effect of the filter screen 9 is maintained all the time, when the collecting bin 10 is filled with fly ash particles, the bin door 11 can be opened to clean the fly ash particles in the collecting bin 10 and then pull the fly ash particles to be buried, as shown in fig. 1, the flue gas from which the fly ash particles are removed removes the water mist in the flue gas through the demister 4, then the flue gas enters the purifying tank 20 through the connecting pipe 16, as shown in fig. 4 and 5, when the flue gas enters the purifying tank 20, the flue gas firstly enters the filter element 29 through the smoke inlet cover head 17, after the harmful substances in the flue gas are filtered through the filter element 29, the harmless flue gas enters the purifying tank 20, meanwhile, the sealing ring 19 prevents the non-filtered flue gas from entering the purifying tank 20 from the connection between the smoke inlet cover head 17 and the top plate 21, and simultaneously prevents the flue gas from entering the purifying tank 20 from the connection between the bottom plate 31 and the ash discharge pipe 32, and then the fan 36, the fan 36 draws out and discharges the harmless flue gas in the purification tank 20 through the exhaust duct 35, as shown in fig. 3 and 4, when the flue gas enters the filter element 29, the flue gas first impacts the blade 26 to drive the blade 26 to rotate, the rotating shaft 25 is driven to rotate through the rotation of the blade 26, so that the spiral plate 27 rotates, the spiral plate 27 drives the brush bristles 28 to continuously and automatically clean the dust adsorbed and gathered on the inner wall of the filter element 29 while rotating, the filter element 29 is kept in the optimal filtering state constantly, the filtering efficiency is improved, meanwhile, the support frame 23 between the top plate 21 and the bottom plate 31 prevents the filter element 29 from deforming when being cleaned by the brush bristles 28, the strength of the filter element 29 is improved, the dust cleaned by the brush bristles 28 falls into the dust collection box 34 through the dust exhaust duct 32 under the action of gravity, when the dust collection box 34 is filled with the dust to be cleaned, the dust exhaust valve 33 can be closed first, and the dust collection box 34 is ensured to be, the smoke in the filter element 29 is prevented from leaking, and when the dust collecting box 34 is reinstalled after cleaning is completed, the dust discharge valve 33 is opened, so that the dust can automatically fall into the dust collecting box 34, thereby completing a series of work.

It is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the purpose of convenience and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and are not to be considered limiting of the scope of the present invention.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides an environment-friendly flue gas purification equipment for msw incineration, includes absorption tank (1), screw (8), filter screen (9), purification tank (20), blade (26), brush hair (28) and filter core (29), its characterized in that: the absorption tank is characterized in that a smoke inlet pipe (2) is connected to the middle of the left side of the absorption tank (1), a shunt pipe (15) is arranged above the smoke inlet pipe (2), an atomizing nozzle (3) is installed on the inner side of the shunt pipe (15), the atomizing nozzle (3) is connected with a water pump motor (6) through a water pipe (5), the water pump motor (6) is connected with a pump body (7) through the water pipe (5), the pump body (7) is arranged at the bottom of the absorption tank (1), a filter screen (9) is arranged at the bottom of the absorption tank (1), collecting bins (10) are arranged at the left end and the right end of the filter screen (9), a bin door (11) is arranged at the lower end of the collecting bin (10), a servo motor (12) is installed at the bottom of the absorption tank (1), a screw (8) is installed above the servo motor (12), a demister (4) is arranged above, the right end of the connecting pipe (16) is connected with a smoke inlet cover head (17), a purifying tank (20) is installed on the outer side of the smoke inlet cover head (17), the lower end of the smoke inlet cover head (17) is connected with a top plate (21) through a screw (18), a sealing groove (22) is formed in the upper surface of the top plate (21), a sealing ring (19) is installed in the sealing groove (22), a supporting frame (23) is arranged in the middle of the top plate (21), a rotating shaft (25) is installed in the middle of the supporting frame (23) through a second bearing (24), blades (26) are installed at the upper end of the rotating shaft (25), a spiral plate (27) is installed in the middle of the rotating shaft (25), brush bristles (28) are arranged on the outer side of the spiral plate (27), the lower end of the top plate (21) is connected with a bottom plate (31) through a supporting column (30), a, and ash valve (33) are installed to ash discharge pipe (32) lower extreme to ash collection box (34) are installed to ash discharge valve (33) lower extreme, purification can (20) below is connected with exhaust pipe (35), and exhaust pipe (35) are connected with fan (36).

2. The environment-friendly flue gas purification equipment for waste incineration as claimed in claim 1, wherein: the atomizing spray heads (3) are arranged in 6 numbers, the atomizing spray heads (3) are rotationally symmetrical relative to the center line of the shunt pipe (15), and the center line of the shunt pipe (15) and the center line of the absorption tank (1) are overlapped.

3. The environment-friendly flue gas purification equipment for waste incineration as claimed in claim 1, wherein: the surface plane of the propeller (8) is electroplated with a silver ion coating (13), a sponge ring (14) is arranged around the propeller (8), and the maximum outer diameter of the sponge ring (14) is equal to the inner diameter of the absorption tank (1).

4. The environment-friendly flue gas purification equipment for waste incineration as claimed in claim 1, wherein: the central line of the collection bin (10) is overlapped with the central line of the filter screen (9), and the central line of the collection bin (10) is overlapped with the central line of the absorption tank (1).

5. The environment-friendly flue gas purification equipment for waste incineration as claimed in claim 1, wherein: the central line of the smoke inlet hood head (17) is overlapped with the central line of the purification tank (20), and the central line of the smoke inlet hood head (17) is overlapped with the central line of the ash discharge pipe (32).

6. The environment-friendly flue gas purification equipment for waste incineration as claimed in claim 1, wherein: the center line of the top plate (21) and the center line of the bottom plate (31) are overlapped, and the surface plane of the top plate (21) and the surface plane of the bottom plate (31) are parallel to each other.

7. The environment-friendly flue gas purification equipment for waste incineration as claimed in claim 1, wherein: the central line of the rotating shaft (25) is superposed with the central line of the top plate (21), and the central line of the rotating shaft (25) is superposed with the central line of the filter element (29).

8. The environment-friendly flue gas purification equipment for waste incineration as claimed in claim 1, wherein: the rotating center line of the blade (26) is overlapped with the center line of the smoke inlet cover head (17), and the rotating center line of the blade (26) is overlapped with the shaft axis of the rotating shaft (25).

9. The environment-friendly flue gas purification equipment for waste incineration as claimed in claim 1, wherein: the central line of the filter element (29) and the rotating central line of the brush hair (28) are coincident with each other, and the inner diameter of the filter element (29) is equal to the rotating diameter of the brush hair (28).