KR101552163B1 - High efficiency dry street sweeper - Google Patents

Abstract

The present invention relates to a high-efficiency dry-type road cleaning vehicle. The purpose of the present invention is to provide the high-efficiency dry-type road cleaning vehicle capable of cleaning various kinds of wastes and being used for four seasons by smoothly cleaning regardless of a kind or a condition of the wastes sucked with air. To achieve the same, the present invention provides the high-efficiency dry-type road cleaning vehicle including a vehicle with a storage container; a sucking device installed in the lower side of the vehicle, connected to the storage container, and sucking the wastes on a road to the inside of the storage container (110); a sucking fan installed in the vehicle or the storage container and generating a sucking force to suck the wastes using the sucking device; and a filtering device separating the wastes received inside the storage container by the sucking device from air and storing the separated waste inside the storage container. The present invention includes a chain filter characterized by including a first filtering chamber formed inside the storage container to receive air sent to the inside of the storage container by the sucking device preferentially and multiple chains compose of multiple connected rings, hung from the ceiling of the filtering chamber, separating the wastes sent to the filtering chamber from air by being hung from the first filtering chamber to have a structure separated from each other.

Description

[0001] The present invention relates to a high efficiency dry street sweeper,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-efficiency dry road surface sweeper, and more particularly, to a filter device for improving the efficiency of a filtering device to smoothly perform a road surface cleaning operation without clogging the filtering device regardless of the type and state of the inhaled trash, The present invention relates to a high-efficiency dry road surface sweeper capable of operating in all seasons, as well as being usable in a cleaning operation of a road surface.

Generally, each local government or an organization that manages roads carries out the task of maintaining and managing the roads in a clean state by removing the dust and dirt that have fallen on the roads periodically to the roads already constructed and used.

Especially, the treatment of waste is very important in relation to the beauty of the city. Among them, cleaning of roads and roads is important because of the characteristics of the city where the population is concentrated.

As a result, a road sweeper which sucks foreign matter on the road surface and cleans the road surface is used so that even a man with less maintenance and management of the road can be easily handled.

On the other hand, a conventional street sweeper is provided with a water spray nozzle for spraying water on the front portion of the vehicle, and a brush and a vacuum suction device are installed in the center or rear of the vehicle to perform cleaning work on the road surface.

However, the above-described conventional road sweeper has a problem in that it can not be operated in winter.

In other words, the conventional road sweeper prevents the scattering of dust by spraying water through the water spray nozzle. However, in winter, the water sprayed on the road freezes on the road to form an icing area, It was virtually impossible to use it.

In addition, the water sprayed on the road is scattered around in the process of driving the vehicle, causing a secondary pollution, and a large amount of water is required for the cleaning work. There was a problem.

On the other hand, a road dust cleaner capable of performing a cleaning operation using only a vacuum suction device without spraying water is disclosed in Patent Registration No. 0926900.

The road dust sweeper disclosed in the above patent document includes a blower, an inhaler, a cyclone dust collector, and a bag filter, and has a method of sucking and collecting various dusts present on the road surface.

However, in the case of the above-mentioned road dust cleaner, when the waste having relatively large area such as a fallen leaf or paper is introduced into the cyclone dust collector, a part or all of the air flow path provided in the cyclone dust collector is blocked, .

Meanwhile, since the cyclone dust collector provides a function of primarily filtering various kinds of garbage sucked by a sweeping car, a large amount of garbage is loaded in the inside during the cleaning operation. Therefore, in order to perform cleaning work on the road surface for a long time by using a road sweeper equipped with a cyclone dust collector, the dust collection capacity of the cyclone dust collector must be considerably large.

However, since the capacity of the cyclone dust collector to be mounted on the sweeper is limited, the conventional dust sweeper using the cyclone dust collector can not perform the cleaning work for a long time.

Further, when wet or water-containing trash flows into the cyclone dust collector or the bag filter, holes are formed in the cyclone dust collector or the bag filter to lower the suction force.

Patent Registration No. 0926900 (issued on Nov. 17, 2009) Patent Registration No. 1384729 (issued on Apr. 14, 2014)

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a cleaning apparatus and a method of cleaning a garbage, And to provide a highly efficient dry road sweeper capable of operating four seasons.

According to an aspect of the present invention, there is provided a vehicle comprising: a vehicle; A suction device installed at a lower end of the vehicle and connected to the loading box to suck the waste on the road surface into the loading box; A suction fan installed in the vehicle or the loading box, the suction fan generating a suction force to enable the suction of the waste by the suction device; And a filtering device for separating the waste introduced into the loading box from the air by the suction device so as to be collected in the loading box, wherein the filtering device comprises a chain filter, a dust collecting filter and a perforated network filter, The chain filter includes: a first filtering chamber formed inside the loading box to receive the air sucked into the loading box by the suction device; And a plurality of chains connected to the first filtering chamber and separated from the air, the first filter chamber being suspended from the first filtering chamber to have a mutually spaced structure, Wherein the dust filtering filter is installed inside the loading box to allow the air discharged from the first filtering chamber to flow therein and is connected to the suction fan to receive a suction force, Wherein the perforated network filter is hinged to a bottom surface of the dust filter and is installed to open or close an inlet formed on a bottom surface of the dust filter while being rotated around a hinge axis, ; And a plurality of screen members formed of a vertical portion and an inclined portion and disposed inside the frame so as to be spaced apart from each other by a predetermined distance.

In the high efficiency dry road surface sweeper, at least one side surface of the first filtering chamber may be provided with a buffer plate for colliding with the chain to mitigate the impact.

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Meanwhile, in the high efficiency dry road surface cleaner, the dust filter is installed inside the loading box, and the bottom surface portion is opened to allow the air discharged from the first filtering chamber to be opened, A second filtering chamber formed on one side surface thereof; A separation plate installed in the second filtering chamber to divide the inside of the second filtering chamber into an inlet side space and a discharge side space, the separation plate having at least one installation hole in which a bag filter is installed; And at least one bag filter installed in the installation hole for filtering dust, wherein each of the bag filters comprises: a head mounted on a separation plate when the separation plate and the bag filter are coupled; A gore-Tex layer formed integrally with the head portion so as to have a structure penetrating through the installation hole when the bag filter and the separator are coupled to each other, the filter layer comprising a net of a woven fabric or a metal thin wire, And a filtration part formed by forming a limestone powder coating layer on the surface of the filter.

In the high-efficiency dry road surface sweeper, the front and back surfaces of the filtration unit may have a corrugated structure in which convex portions and concave portions are repeated continuously.

On the other hand, in the high efficiency dry road surface sweeper, two inclined surfaces having mutually symmetric structures are formed on the upper surface of the head portion, and a groove having a triangular cross-sectional structure may be further formed.

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In the high efficiency dry road surface sweeper, at least one air injection pipe installed in the second filtering chamber for spraying air toward the head portion from above the head portion of the bag filter; An air tank installed in the loading box to store compressed air supplied from a compressor under a preset pressure condition; And an electric opening / closing valve installed in a pipe connecting the air tank and the air injection pipe to supply compressed air of the air tank to the air injection pipe by opening a flow path of the pipe in accordance with a control signal. .

According to the present invention, most of the garbage excluding the dust among the garbage that is sucked into the inside of the loading box by the suction device is caught by the chain filter composed of a plurality of chains and separated from the air, Since the vibrations generated during the operation of the vehicle or the airflow inside the loading box continuously shake it up, even if the garbage having relatively large area such as paper or fallen leaves or the wetted and wetted garbage is introduced and attached to the chain, Since most of the garbage flowing into the loading box is directly dropped to the bottom of the loading box, the efficiency of the cleaning operation can be improved. have.

In addition, the multi-stage filtering method using a chain filter, a perforated network filter and a dust filter can collect not only fine dust but also ultrafine dust, and the Gore-Tex layer formed on the surface of the bag filter, It is possible to prevent damage to the bag filter caused by wet trash, and thus, it is possible to operate both the dry cleaning operation and the wet cleaning operation.

1 is a side view of a dry road surface sweeper according to a preferred embodiment of the present invention;
2 is a plan view of a dry road surface sweeper according to a preferred embodiment of the present invention,
3 is a perspective view showing a structure of a chain filter according to the present invention,
4 is a side view showing the structure of the dust filter according to the present invention,
5 is an exploded perspective view showing the structure of a dust filter according to the present invention,
6 is a sectional view showing the structure of a bag filter according to the present invention,
7 is a sectional view showing a structure of a head of a bag filter according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a side view of a dry road surface sweeper according to a preferred embodiment of the present invention, and FIG. 2 is a plan view of a dry road surface sweeper according to a preferred embodiment of the present invention.

The dry road surface sweeping apparatus according to the present invention improves the structure of the filtering device 400 for separating the waste sucked in with the air into the inside of the loading box 110 from the air to collect various kinds of waste irrespective of the type and state of the waste. So that the efficiency of cleaning work on the road surface can be improved.

To this end, the dry road surface sweeper according to the present invention comprises a vehicle 100, a suction device 200, a suction fan 300, and a filtering device 400.

The vehicle 100 includes a plurality of wheels, an engine for generating power for rotating the wheels, a power transmission device for transmitting the power generated by the engine to the wheels, And a loading box 110 on which waste materials to be collected are stacked is installed at the rear side.

The suction device 200 is installed at a lower end of the vehicle 100 and connected to the loading box 110 to receive and receive a suction force. The suction device 200 sucks the waste on the road surface, .

In order to increase the collection efficiency of the garbage by the suction device 200, brushes 210 and 220 may be installed before and after the suction device 200. In FIG. 1, There is shown a structure in which a circular brush 210 having a structure rotating around an axis is disposed and a cylindrical brush 220 having a structure rotating around a substantially horizontal rotation axis is disposed behind the suction device 200 .

The suction fan 300 generates a suction force so that the suction device 200 can suck the waste. The suction fan 300 can be installed inside or outside the loading box 110. The suction fan 300 generates a suction force inside the loading box 110 by forcibly discharging the air inside the loading box 110 to the outside of the loading box 110. The suction fan 300 is provided with a power take- Or may be configured to operate by receiving power generated by a separate engine or motor.

The filtering device 400 separates the waste introduced into the loading box 110 from the air so that the waste is collected in the loading box 110 and the clean air from which the waste is removed is discharged to the outside. A dust collection filter 420 and a perforated network filter 430.

3 is a perspective view showing a structure of a chain filter according to the present invention.

The chain filter 410 separates relatively bulky waste out of the trash 110 from the air, and is composed of a first filtering chamber 411 and a plurality of chains 412.

The first filtering chamber 411 is connected to the loading unit 110 through a tube 230 connecting the loading unit 110 and the suction unit 200 so that the air and trash are introduced into the loading unit 110 first. The first filtering chamber 411 has a structure in which an upper surface, front, rear, left and right sides are closed, and a bottom surface is opened.

The tubular body 230 connecting the loading unit 110 and the inhalation unit 200 is configured such that the air and the waste introduced into the loading unit 110 are moved upward from the lower side of the front side of the first filtering chamber 411 in a substantially inclined upward direction And is connected to the front side of the loading box 110 so as to have an upward inclined structure so as to be introduced into the first filtering chamber 411.

The chain 412 primarily filters the heavy trash other than dust among the trash introduced into the first filtering chamber 411 so that the chain 412 is dispersed as a whole in the first filtering chamber 411, As shown in FIG.

Each of the chains 412 is formed to have a predetermined length by being connected to a plurality of rings in order, and has a structure in which one end is suspended from the ceiling of the first filtering chamber 411.

The chain filter 410 composed of the first filtering chamber 411 and the plurality of chains 412 is configured such that air flows through the gaps between the chains 412 and the rings and the rings forming the chain 412, And the waste introduced into the first filtering chamber 411 together with the air is caught by the chain 412 and then left as it is and accumulates on the floor of the loading box 110. [

Each of the chains 412 has a structure in which the upper end thereof is suspended from the ceiling of the first filtering chamber 411. The vibration generated in the running process of the sweeping car and the flow of air formed inside the loading box 110 It is possible to prevent the trash from being caught by the chain 412 and remaining in the chain filter 410.

As described above, when the chain 412 swinging in the first filtering chamber 411 collides with the front, rear, left and right sides constituting the first filtering chamber 411, noise is generated as well as noise is generated in the first filtering chamber 411 411 and the chain 412 may be damaged, a buffer plate 413 may be provided on at least one of the front, rear, left, and right sides of the first filtering chamber 411.

3, the ceiling, the front side surface and the right side surface are formed by the ceiling, the front side surface and the right side surface of the loading box 110, and the first filtering chamber 411 formed by the rear side surface and the left side surface by the buffer plate 413, .

The first filtering chamber 411 may be formed inside the loading box 110 by using a part of the loading box 110 as a side surface of the first filtering chamber 411. The buffering plate 413 May be configured to form the side of the first filtering chamber 411 by itself and a buffer plate 413 may be provided on the front and right sides of the first filtering chamber 411 although not shown.

The buffer plate 413 may be made of a rubber material and fixed to the ceiling or side of the loading box 110 by bolting or an adhesive.

FIG. 4 is a side view showing the structure of the dust filter according to the present invention, FIG. 5 is an exploded perspective view showing the structure of the dust filter according to the present invention, FIG. 6 is a sectional view showing the structure of the bag filter according to the present invention, 7 is a cross-sectional view showing the structure of the head of the bag filter according to the present invention.

The dust filter 420 removes dust contained in the air discharged from the loading box 110 to discharge clean air to the outside and includes a second filtering chamber 421, a separation plate 422, a bag filter 423 ).

The second filtering chamber 421 is positioned at the upper end of the inner rear end of the loading unit 110 and the bottom of the second filtering chamber 421 is opened to allow the air discharged from the first filtering chamber 411 to flow. And a discharge port 4211 connected to the discharge port 4211 is formed on one side surface.

The separating plate 422 is installed inside the second filtering chamber 421 so as to have a horizontal structure and divides the internal space of the second filtering chamber 421 into the inflow space S1 and the discharge space S2 .

One or more installation holes 4221 for installing the bag filter 423 are formed in the separation plate 422. In the separation plate 422 applied to the high efficiency dry road surface sweeper according to the preferred embodiment of the present invention, An installation hole 4221 is formed.

The bag filter 423 filters dust contained in the air flowing from the inflow space S1 to the discharge space S2 by being installed in the installation hole 4221 formed in the separation plate 422, (4231) and a filtration unit (4232).

The head portion 4231 is a portion which is seated on the separating plate 422 when the separating plate 422 and the bag filter 423 are coupled to fix the bag filter 423 to the separating plate 422, A plurality of holes 4233 are formed so that the air filtered by the filter 4232 can be introduced into the discharge-side space S2.

A groove 4234 is formed on the upper surface of the head portion 4231 so that air can be smoothly communicated through the hole 4233. The groove 4234 has two inclined surfaces 4234a and 4234b are formed at the lower end to have a triangular cross-sectional structure, and the upper end of the hole 4233 forms a trumpet-like structure by the groove 4234 thus formed.

The filtration unit 4232 is integrally formed with the head unit 4231 so as to have a structure to pass through the installation hole 4221 when the bag filter 423 and the separation plate 422 are coupled, It provides a function to block the flow of dust or other fine trash.

The filter portion 4232 is configured to filter ultrafine dust as well as fine dust, and to prevent moisture or water from penetrating into the inside of the filtration portion 4232.

More specifically, the filtration part 4232 is formed by forming a gore-Tex layer 4232b on the surface of a filter layer 4232a made of a mesh or a metal fine wire mesh and forming a limestone powder coating layer 4233c on the surface of the gore- ).

Meanwhile, the limestone powder coating layer 4233c may be formed by applying a paint mainly composed of limestone powder to the surface of the gore-Tex layer 4232b.

In order to increase the contact area with the air in the limited space, the front and rear surfaces of the filtration unit 4232 are structured such that the convex and concave portions are repeatedly continuous in the wave structure, and a plurality of rhombs As shown in Fig.

The perforated network filter 430 is installed on the open bottom portion of the second filtering chamber 421 to prevent waste having a volume other than dust from entering the second filtering chamber 421, A frame 431 hinged to the bottom of the second filtering chamber 421 and hinged to the bottom of the second filtering chamber 421 to rotate about the hinge axis H and to open or close the bottom of the second filtering chamber 421 and a vertical portion 4321 and an inclined portion 4322, And a plurality of screen members 432 provided on the inner side of the frame 431 so as to be spaced apart from each other by a predetermined distance.

On the side of the frame 431, a plurality of holes 4311 for air flow are formed.

The perforated network filter 430 thus configured prevents the bulky waste from being introduced into the second filtering chamber 421 and is separated from the air by the bag filter 423 and flows to the bottom of the second filtering chamber 421 The falling dust flows down on the upper surface of the screen member 432 due to the shape characteristic of the screen member 432 having a sectional shape of '∧', and falls to the bottom of the loading box 110.

The dust collecting filter 420 may include an air pulsing means 440 for periodically removing dust attached to the bag filter 423 to allow the dust filter 420 to continuously maintain its performance during a cleaning operation . ≪ / RTI >

The air pulsing means 440 is composed of an air injection pipe 441, an air tank 442 and an electric opening / closing valve 443.

The air injection pipe 441 is horizontally disposed inside the discharge side space S2 of the second filtering chamber 421 so as to inject air toward the head part 4231 from above the head part 4231 of the bag filter 423 And one or more air injection pipes 441 may be installed according to the number and arrangement of the bag filters 423 installed in the dust filter 420.

The air tank 442 is connected to an air injection pipe 441 and connected to a compressor (not shown) installed in the vehicle 100 to store compressed air supplied from a compressor under predetermined pressure conditions, And is installed in the loading box 110 by supplying the air to the spraying pipe 441.

The electric opening / closing valve 443 is installed in a pipe connecting the air tank 442 and the air injection pipe 441, and opens the flow path of the pipe while operating by a control signal generated periodically or by an operator's operation .

The air pulsing means 440 having such a structure can instantaneously blow the high-pressure compressed air stored in the air tank 442 into the bag filter 423 so that dust attached to the bag filter 423 can be shaken out more effectively do.

The process of treating the waste introduced into the loading box 110 by the suction device 200 during the cleaning operation of the road surface using the highly efficient dry road surface sweeper according to the present invention will be described. So that the effect of the high efficiency dry road sweeper can be more clearly shown.

The waste introduced into the first filtering chamber 411 from the suction device 200 is first introduced into the first filtering chamber 411. The waste introduced into the first filtering chamber 411 is introduced into the first filtering chamber 411 411, and can not flow together with the air and fall off to the bottom of the loading box 110. [0052] As shown in FIG.

Of course, some of the trash may be caught in the chain 412 and remain in the first filtering chamber 411, but each chain 412 is suspended from the ceiling of the first filtering chamber 411, The interval between the adjacent two chains 412 is changed in the process of rocking the chain 412, or the distance between the adjacent two chains 412 is changed 412 are rubbed with each other to induce detachment of waste, so that most of the waste introduced into the first filtering chamber 411 falls to the bottom of the loading box 110.

On the other hand, the air introduced into the first filtering chamber 411 flows through the clearance between the chain 412 and the chain 422 and the clearance between the rings constituting the chain 412, 1 through the lower part of the first filtering chamber 411 and then into the second filtering chamber 421 through the perforated network filter 430.

In the process of introducing air discharged from the first filtering chamber 411 into the second filtering chamber 421 as described above, the perforated filter 430 discharges the waste accumulated on the bottom of the loading box 110 to the air flow, So that it is prevented from flowing into the inside of the filtering chamber 421.

As described above, since most of the trash that is introduced into the inside of the loading box 110 by the suction device 200 except dust is separated from the air by the chain filter 410 and the perforated network filter 430, Only the dust in the form of dust is mainly introduced into the filtering chamber 421.

Meanwhile, since the dust introduced into the second filtering chamber 421 is separated from the air by the bag filter 423, the air discharged from the loading box 110 through the suction fan 300 is kept in a clean state .

The filtration section 4232 of the bag filter 423 is formed of triple layers of the filter layer 4232a, the gore-Tex layer 4232b and the limestone powder coating layer 4233c to be filtered out as fine dust as well as fine dust. The Gore-Tex layer 4232b prevents moisture from flowing into the interior of the bag filter 423, so that the bag filter 423 is damaged or contaminated even when wet trash is introduced into the loading box 110 .

As described above, the dry road surface sweeper according to the present invention is advantageous in that the filtering device 400 is not clogged even when garbage such as paper or fallen leaves is sucked so that a smooth cleaning operation can be performed irrespective of the type of the garbage .

In addition, since the chain filter 410, the perforated network filter 430, and the bag filter 423 are not affected by moisture, the dry road surface sweeper according to the present invention can be used not only for dry cleaning without water, There is an advantage in that the efficiency of the operation of the road sweeper can be improved so as to be usable for the wet cleaning operation.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Description of the Related Art
100: vehicle 110: load
200: Suction device 300: Suction fan
400: Filtering device 410: Chain filter
411: first filtering chamber 412: chain
413: buffer plate 420: dust collecting filter
423: bag filter 430: perforated filter
421: second filtering chamber 4211: outlet
422: separation plate 4221: installation hole
423: bag filter 4231: head part
4232: Filtration section 4232a:
4232b: Gore-Tex layer 4233c: Limestone powder coating layer
4234: Home 431: Frame
4311: hole 432: screen member
4321: vertical part 4322: inclined part
440: air pulsing means 441: air blowing pipe
442: Air tank 443: Electric opening / closing valve

Claims (8)

A vehicle 100 provided with a loading box 110;
A suction device 200 installed at a lower end of the vehicle 100 and connected to the loading box 110 to suck the waste on the road surface into the loading box 110;
A suction fan (300) installed in the vehicle (100) or the loading box (110) and generating a suction force to enable the suction device (200) to suck garbage;
And a filtering device (400) for separating the waste introduced into the loading box (110) from the air by the suction device (200) and collecting the waste in the loading box (110)
The filtering device 400 includes a chain filter 410, a dust collection filter 420, and a perforated network filter 430,
The chain filter 410 includes a first filtering chamber 411 formed inside the loading chamber 110 to receive the air sucked into the loading chamber 110 by the suction device 200 preferentially. And a plurality of rings are connected to each other. The first filtering chamber 411 is suspended from the ceiling of the first filtering chamber 411 and is suspended from the first filtering chamber 411 to have a mutually spaced structure and flows into the first filtering chamber 411 And a plurality of chains (412) for separating the waste from the air,
The dust collecting filter 420 is installed in the loading chamber 110 so that the air discharged from the first filtering chamber 411 flows into the loading chamber 110 and is connected to the suction fan 300 to receive the suction force. Or more of the bag filter 423,
One end of the perforated filter 430 is hinged to the bottom of the dust filter 420 to open or close an inlet formed in the bottom of the dust filter 420 while rotating around the hinge axis H A frame 431 provided with a plurality of holes 4311 on the side surface thereof; And a plurality of screen members (432) made up of a vertical portion (4321) and an inclined portion (4322) and provided inside the frame (431) so as to be spaced apart from each other by a predetermined distance. The method according to claim 1,
Wherein at least one side of the side of the first filtering chamber 411 is provided with a buffer plate 413 for colliding with the chain 412 to mitigate impact. delete The method according to claim 1,
The dust collecting filter (420)
And a discharge port 4211 connected to the suction fan 300 is installed in the loading box 110. The discharge port 4211 is connected to the suction fan 300, A second filtering chamber (421) formed on the side surface;
The second filtering chamber 421 is provided with an installation hole 4221 in which the bag filter 423 is installed so as to divide the inside of the second filtering chamber 421 into the inlet side space S1 and the discharge side space S2. A separation plate 422 formed at least one of the separation plates 422;
And at least one bag filter (423) installed in the installation hole (4221) for filtering dust,
Each of the bag filters (423)
A head portion 4231 which is seated on the separating plate 422 when the separating plate 422 and the bag filter 423 are engaged;
A filter layer 4232a formed integrally with the head portion 4231 so as to have a structure to pass through the installation hole 4221 when the bag filter 423 and the separation plate 422 are coupled, And a filtration part (4232) having a gore-Tex layer (4232b) formed on the surface thereof and a limestone powder coating layer (4233c) formed on the surface of the gore-Tex layer (4232b). The method of claim 4,
Wherein a front surface and a rear surface of the filtration part (4232) have a wave structure in which convex portions and concave portions are repeatedly continuous. The method of claim 4,
And a groove (4234) having a triangular cross-sectional structure is further formed on the upper surface of the head part (4231), with two inclined surfaces (4234a, 4234b) having symmetrical structures formed at the lower end thereof. delete The method according to claim 1,
At least one air injection pipe (441) installed in the second filtering chamber (421) to inject air toward the head part (4231) from above the head part (4231) of the bag filter (423);
An air tank (442) installed in the loading box (110) to store compressed air supplied from a compressor under a preset pressure condition;
Is provided in a pipe connecting the air tank 442 and the air injection pipe 441 so that the compressed air of the air tank 442 is supplied to the air injection pipe 441 by opening the flow path of the pipe in accordance with the control signal And an air opening / closing valve (443) for opening / closing the valve.

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