JP2012217976A - Cleaning device of dust collection body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a cleaning device of a dust collection body suitable for work actual situations in an actual maintenance service site.SOLUTION: The cleaning device C of the dust collection body is a device which is provided with a cylindrical drum body 20 having a treatment chamber 20b in its inside, a suction device 3 for sucking air in the treatment chamber 20b and a blowing nozzle 5, removes fine particles (D) in the state that the dust collection body (f) is received in the treatment chamber 20b, and discharges the fine particles from the cylindrical drum body 20. The cylindrical drum body 20 is provided with al least a pair of support rollers 24 which are installed in an inclined state and of which the axial direction is arranged to lie along the drum inner wall in the treatment chamber 20b, and a center roller 25 which is installed on a line near the bottom part of the treatment chamber 20b in the direction nearly orthogonal to each of the support rollers 24 and passing nearly the middle of the bottom part. One or both of the support rollers 24 and the center roller 25 is in the state capable of being driven.

Description

  TECHNICAL FIELD The present invention relates to a dust collector cleaning device mainly for a dust collector such as an air filter for an automobile engine or a diesel engine exhaust gas carbon collection filter called DPF (Diesel Particulate Filter). is there.

A dust collector such as a dust collection filter such as the air filter or the DPF collects collected dust (dust) or the like on the filter element as it is used, and reduces the purification capacity. For this reason, these dust collectors are managed to maintain engine performance by cleaning and removing dust at appropriate intervals until the dust collector itself deteriorates and a replacement cycle comes. .
For removing dust adhering to such filter collection elements, a physical dust removal method such as air blow is used. In addition, in order to prevent deterioration of the surrounding work environment due to dust scattering due to air blow, these dusts are removed. In addition, a suction method for collecting the powder without scattering is considered (Patent Documents 1 and 2).

As an example of this, an air filter is used as a processing target, and the air filter is inserted into a sealable chamber to perform air blowing and suction. However, its spread is not sufficient. The reason is that the apparatus introduction cost is excessive in view of the actual work at the service site, that is, the work frequency, the work difficulty, and the like.
In addition, in such a conventional large-scale apparatus, although the cleaning operation can be performed fully automatically, the work time cannot be sufficiently shortened by including the setup of the operation.
In addition, this device is a dedicated device only for the air filter, and does not take into account the cleaning of the DPF, which has recently been required to work, and cannot be used in combination.

Japanese Patent Laid-Open No. 03-4914 Japanese Patent Laid-Open No. 06-47220

  The present invention has been made in consideration of these various backgrounds, and intends to develop an apparatus that matches the actual work situation in an actual maintenance service site. That is, the present invention can process both the air filter and the DPF, can process even an irregular shape, has good workability, and has a simple configuration that can be supplied at low cost. The present invention proposes a dust collecting body cleaning device including a novel dust collecting filter that can solve various technical problems such as being.

The dust collector cleaning device according to claim 1 is a cylindrical drum body having a processing chamber inside, a suction device connected to the drum body for sucking air in the processing chamber, and inserted into the processing chamber of the drum body. A blowout nozzle device which can be operated freely, while the suction device is operated in a state where the dust collector is received in the processing chamber, the dust collected by the dust collector is removed by the blowing air from the blowout device. A device for discharging dust from the drum body by a suction device,
The drum body is provided in an inclined state, and in the processing chamber of the drum body, at least a pair of support rollers arranged in an axial direction along the inner wall of the drum, and a direction substantially orthogonal to the support roller near the bottom of the processing chamber The center roller is provided on a line passing through the substantially center of the bottom portion, and one or both of the support roller and the center roller are in a driveable state.

  The dust collector cleaning device according to a second aspect is characterized in that, in addition to the requirements of the first aspect, the support working surface of the center roller is in a center-down state.

  In addition to the requirements of claim 1 or 2, the dust collector cleaning device according to claim 3 has a suction port cover for collecting foreign matter inside the drum main body at a site to which the suction device is connected. Is provided as a feature.

  In addition to the requirements of claim 1, 2, or 3, the cleaning device for the dust collector according to claim 4 further includes a recovery device connected to the subsequent stage of the suction device for sucking the processing chamber air. The suction device and the recovery device are both mounted on a frame that supports the drum body.

In addition to the requirements of the fourth aspect, the dust collecting body cleaning device according to claim 5 is provided with a dust collecting drum having a cylindrical shape that is short in the vertical direction, and above the dust collecting drum. A bag filter and a collection bag provided below the bag filter;
A dust receiving hole is formed so that the air guiding direction is a tangential direction with respect to the dust collecting drum, and the inner side of the dust collecting drum has an inner flange shape that is constricted above the dust receiving hole. Cyclone guide is provided,
On the other hand, the collection bag has a constricted portion in the vertical direction, and the dust collecting drum and the cyclone reversing portion above the constricted portion of the collection bag cooperatively constitute a cyclone action portion, and the cyclone action Thus, the main recovery of dust is performed.

According to the first aspect of the present invention, the drum body in the cleaning drum unit is provided in an inclined state, and the dust collector, which is the object to be processed, is disposed on the support roller provided in parallel along the wall surface of the processing chamber. By bringing the dust collector together, the bottom of the dust collector comes into contact with a support roller provided near the bottom of the drum body. By rotating and driving the support roller, in the case of a cylindrical air filter that is normally open at the center, the support roller is supported by the support roller in an inclined state in the processing chamber of the drum body, and is rotated by the drive of the center roller. At this time, the operator blows the dust collected by blowing the pressure on the surface of the air filter with the discharge nozzle, while sucking the air in the drum body by the action of the suction device, thereby removing the dust from the processing chamber. Eliminate smoothly.
By such an operation, it is possible to clean an effective dust collector and the like with a simple configuration.

  According to the second aspect of the present invention, since the center roller contacts the dust collecting filter at one point, the rotation of the dust collecting filter by the center roller is smoothly and reliably performed.

  According to the third aspect of the invention, the presence of the suction port cover can prevent foreign matter other than dust from being accidentally sucked into the collecting device.

  According to the fourth aspect of the present invention, the cleaning device integrally includes a cleaning drum unit, a suction device, and a recovery device, and the dust recovery can be completed with this cleaning device.

  Further, according to the invention described in claim 5, while the dust collecting drum is configured to be short, both of them can cooperatively configure the cyclone action portion by setting the lower collection bag in a constricted state. A compact recovery device is obtained.

It is the perspective view (a) from the front of the cleaning apparatus of the dust collector of this invention, and also shows sectional drawing of an operation state in (b) while showing a dust collection filter and the vehicle applied. It is an exploded perspective view same as the above. It is a perspective view from a back same as the above. It is a top view from the opening side of a cleaning drum unit. It is a vertical side view same as the above. It is a vertical side view which shows the other Example of a center roller same as the above.

  The mode for carrying out the present invention includes an embodiment described below, and includes various improved embodiments based on this technical idea.

Reference numeral C denotes a cleaning device according to the present invention, which cleans and removes the dust D collected by the dust collection filter f.
The dust collection filter f as an example of the dust collector is an air filter fa for cleaning combustion air for automobiles or a DPF fd for collecting diesel gas dust (mainly carbon particles). Needless to say, the dust collection filter used in other industrial equipment can be applied.

  First, considering that the cleaning device C is used in an automobile maintenance service factory or the like, the cleaning device C is preferably configured to be relatively compact and movable. In other words, the cleaning drum unit 2, the suction device 3, the recovery device 4, and the discharge nozzle device 5 are mounted on the frame 1 having a square frame chassis shape in plan view. First, the frame 1 is provided with casters 10 on its bottom surface so as to be movable. A drum support bracket 11 that supports the cleaning drum unit 2 is provided on the upper surface of the frame 1, and a dust collection table 12 that supports the suction device 3 and the collection device 4 is provided on the side thereof.

Next, the cleaning drum unit 2 will be described.
The cleaning drum unit 2 has a drum main body 20 as a main member. The drum main body 20 is a cylindrical hollow member as an example, and an upper portion is opened to form an upper opening 20a and the inside thereof is processed. It is set as the chamber 20b. Further, a bottom hopper 21 is formed at the bottom of the drum main body 20 and takes a so-called bottom-squeezed shape. The drum main body 20 is inclined with respect to the frame 1, and the inclination angle of the drum body 20 is in a range of about 40 ° to 60 °, where 90 ° is a straight standing state. Although it can be set, an inclination of 50 ° is a preferred example.

On the other hand, an upper panel 22 is formed on the upper opening 20a side so as to extend slightly outward, and various control switches 23 are provided using the upper panel 22.
Further, an air regulator dial 23A is provided together with the control switch 23 so as to be opposed thereto. Although not shown in detail, this is a knob member that operates an air regulator provided in the compressed air supply path to the discharge nozzle device 5 to control the air discharge pressure. By setting the air regulator dial 23A, an appropriate blow air pressure is set according to the type of the dust collection filter f that is the object to be processed.
The upper panel 22 has an overhanging portion 22 </ b> A so as to protrude inward from the upper opening 20 a of the drum body 20 to the inside. Accordingly, the movement of the dust D scattered in the processing chamber 20b is suppressed, and the dust D in the processing chamber 20b is prevented from rising from the upper opening 20a although it is a slight ridge-like bulging portion 22A.

A support roller 24 is provided in the drum body 20. The support rollers 24 are provided as a pair on the lower side along the inner wall of the processing chamber 20b of the drum body 20 arranged in an inclined manner, and are substantially in the height direction of the drum of the processing chamber 20b. It is provided over the entire range.
The support roller 24 is a free roller that freely rotates in this embodiment, but may be configured to be separately rotatable.

A center roller 25 is provided near the lower end of the support roller 24. That is, the center roller 25 is provided near the bottom of the processing chamber 20b near the bottom hopper 21 of the drum body 20 and on a line that is substantially orthogonal to the support roller 24 and passes through the center of the bottom of the drum body 20. ing. The center roller 25 is provided so as to be drivable. Specifically, by adopting an outer rotor type motor unit, a form in which a motor mechanism is incorporated in the center roller 25 itself is adopted. Reference numeral 26 denotes a bearing stay disposed near the bottom of the drum body 20 and supports the center roller 25 at the center end of the drum body 20.
The arrangement of the center roller 25 in a side view is such that its rotation center axis is biased toward the bottom hopper 21 near the center of the drum body 20. As a result, the driving action surface 25a, which is the surface of the drum main body 20, is formed in a tip-down shape at a portion from the center of the drum body 20. As will be described later, when a cylindrical air filter fa is applied and rotated in the processing chamber 20b to perform cleaning processing, the center roller 25 that drives the air filter fa always has one point on the air filter fa. This is because it takes a form that acts in contact with. Therefore, when the driving action surface 25a of the center roller 25 has a tapered shape as shown in FIG. 6, for example, the rotation center axis of the center roller 25 is orthogonal to the longitudinal direction of the drum body 20. It is also possible to arrange in a state. In the case where the center roller 25 has a tip-down shape, it is exaggerated in the drawing, but is preferably set to an angle of about 5 °.

  Further, a suction port 27 is provided at the center of the bottom hopper 21 side of the drum body 20 as an example, and a suction tube 27a is further extended to the outside. On the other hand, the suction port 27 is provided with a mesh-shaped suction port cover 28 having air permeability. This is a member for preventing this from being sucked when a washer, a nut or the like that may be used inadvertently for fixing the air filter fa during operation is mixed. . As shown in FIGS. 1B, 4 and 5A, the suction port cover 28 has a cylindrical shape with an upper lid portion 28c having air permeability as a whole, and is illustrated in FIG. 5B. Thus, a suction port cover 28A having a top opening 28m as an upper and lower cylinder dropout without an upper lid portion may be used.

Next, the suction device 3 will be described.
The suction device 3 is for preventing the surrounding environment from being deteriorated by sucking the dust D generated in the processing chamber 20b. As its main member, a suction blower 30 is provided adjacent to the cleaning drum unit 2, and the suction blower 30 and the drum body 20 are connected by a suction hose 31. A discharge hose 32 is provided on the discharge side of the suction blower 30, and this discharge hose 32 reaches the recovery device 4 described later.

Next, the collection device 4 will be described.
The collection device 4 includes a dust collecting drum 41, a bag filter 42, and a collection bag 43 as main members. The dust collecting drum 41 is a cylindrical member, and includes the bag filter 42 above the drum collecting drum 41. A hopper-shaped cyclone guide 44 is provided in the body of the dust collecting drum 41, and the collection bag 43 is fixedly attached to the lower portion of the dust collecting drum 41 by a clip ring or the like in a suspended state. .

This configuration will be described in more detail. The collection device 4 collects the dust D by the cyclone action. For this reason, the dust collection drum 41 having a short size when viewed in the vertical direction and the collection bag 43 below the dust collection drum 41 are collected. Together with the upper part, the cyclone action part is configured. That is, the dust collecting drum 41 is provided with the dust receiving hole 45 below the hopper-shaped cyclone guide 44, and the air guide direction is a tangential direction of the dust collecting drum 41 in a plan view. It is.
Here, the dust collecting drum 41 is “short”, because it collects the dust D by the cyclone action as will be described later, so that the height is not high enough to cause the cyclone action. means.

  On the other hand, for example, a transparent resin bag is used as the collection bag 43, and the collection state of the internal dust D can be visually observed from the outside. The collection bag 43 is regulated so as to be squeezed by a regulation ring 46 at an intermediate portion thereof as an example during the vertical direction thereof, thereby forming a constricted portion 43A. The upper part constitutes a cyclone reversing part 43B in which the upper part becomes a part of the cyclone action part with the constricted part 43A as a boundary, and the lower part becomes the dust collecting part 43C. The diameter of the restriction ring 46 is about 1/4 to 1/2 of the diameter of the collection bag 43 in the expanded state, but is outside this range depending on the amount of air blown in, the wind speed, the particle size of the dust D, the mass, etc. You can also select the appropriate dimensions. Similarly, the height position of the constricted portion 43A can be selected according to conditions, but for example, a position that can be selected as an example of a range sandwiched between about 1/3 from the top and bottom in the height direction with the middle position as the center. It is.

Next, the discharge nozzle device 5 will be described.
This has a nozzle body 51 as a main member, and is appropriately held by an operator to operate it. Further, an air hose 52 is extended from the base end portion of the nozzle body 51, and first passes through an air regulator body integrated with the air regulator dial 23A. The air hose 52 is further connected to an air source hose joint 53 mounted on the frame 1. Connected. The air source hose joint 53 is supplied with blown air, for example, by connecting a pressure pipe of an air compressor that is permanently installed in a maintenance service factory or the like. Of course, the hand side of the nozzle body 51 is provided with a trigger for controlling the ejection amount.

The dust collecting filter f cleaning device C of the present invention has the specific configuration as described above, and is used as follows.
First, a basic processing mode of cleaning will be described. A dust collection filter f as a processing object is set in the processing chamber 20b from the upper opening 20a of the drum body 20 that is always open. In this state, the suction blower 30 in the suction device 3 is operated, the discharge nozzle device 5 is operated, the compressed air is discharged from the nozzle body 51, and the dust D collected by the dust collection filter f is blown away. D is sucked by the suction blower 30 together with the surrounding air.
Suction by the suction blower 30 is performed from the suction port 27 of the bottom hopper 21 of the drum body 20. At this time, since the suction port 27 is provided with the suction port cover 28, foreign matter other than the dust D, for example, a foreign matter W such as a washer fixed to the dust collecting filter f falls off and is about to be sucked. But get caught here.
At this time, as described above, the suction port cover 28A having a hollow shape shown in FIG. 5B has the following effects. That is, this type of suction port cover 28A helps to reliably remove dust D because the upper part of the suction port cover 28A is open and the suction action of the suction blower 30 is reduced. This is because there is no pressure loss in the negative pressure direction, and the dust D is sufficiently sucked.
On the other hand, there is a concern that the foreign matter W is not captured by the suction port cover 28A due to the cylindrical shape, but actually, the drum body 20 is inclined as shown in FIG. The foreign matter W having a large mass is prevented from falling vertically and entering the upper opening 28m of the suction port cover 28A.
Further, since the suction port cover 28A achieves reliable suction from the upper opening 28m, even if a large amount of foreign matter W is captured and concentrated around the suction port cover 28A, the dust D is collected. The ability is not reduced.

On the other hand, during the cleaning operation of the dust collecting filter f, the dust D is scattered in the processing chamber 20b of the drum body 20 although the suction is performed as described above. At this time, since the upper opening 20a is formed with a bowl-shaped bulging portion 22A, this portion acts to prevent the dust D from scattering to the outside. The discharge hose 32 of the suction device 3 is connected to the collection device 4 where dust D is collected.
That is, in the collection device 4, as described above, the dust collection drum 41 and the upper part of the lower collection bag 43 cooperatively form a cyclone action unit, whereby dust D is collected in the collection bag 43. Collect in the collection unit 43C. Specifically, the air containing the dust D sent from the dust receiving hole 45 is first guided by the cyclone guide 44 and the inner peripheral wall of the dust collecting drum 41 to form a high-speed vortex, and is inverted at the bottom. Ascends and rises. At this time, a large amount of dust, such as dust D having a large mass, is separated from the air flow and falls into the collection bag 43 and collected. At this time, the dust D once dropped on the dust collecting part 43C remains trapped without being affected by the air current in the cyclone action part because there is a constricted part 43A.
On the other hand, a part of the dust D that has risen together with the central vortex of the cyclone is collected by the bag filter 42, and this is an impact or vibration that strikes the bag filter 42 by hand or the like while the operation is stopped. Is dropped downward and collected in the collection bag 43.

At this time, the cleaning drum unit 2 adopts different modes of action depending on the form of the dust collection filter f to be received.
(I) Cylindrical air filter fa
The air filter fa is cylindrical in the most general form, sucks outside air from the outer periphery of the air filter fa, captures the dust D by the filter element, and then supplies the purified air to the engine E of the vehicle.
In the case of such a cylindrical air filter fa, after being removed from the vehicle body, it is placed on a pair of support rollers 24 in the processing chamber 20b in the drum body 20 and subjected to a cleaning process. . Since the drum main body 20 is inclined at this time, the air filter fa placed on the support roller 24 takes an inclined posture, and the outer circumference circle from the bottom of the air filter fa is shown in FIG. 5. As shown in FIG. 6, the center roller 25 is brought into contact. When the center roller 25 is driven in this state, the rotation is frictionally transmitted to the air filter fa and rotates on the support roller 24. In this embodiment, the air filter fa is driven to rotate by the center roller 25. However, depending on the inclination angle of the drum body 20, the support roller 24 is rotated, thereby rotating the supported air filter fa. May be. Further, it is possible to drive both the support roller 24 and the center roller 25.
Incidentally, the size of the air filter fa that can be received in the drum main body 20 at this time can be applied in various forms from the maximum dimension that can be accommodated in the processing chamber 20b to a small diameter that can be supported by the support roller 24. .

In this state, the operator inserts and removes the nozzle body 51 exclusively in this vertical direction, that is, from the upper opening 20a, by inserting the nozzle body 51 in the discharge nozzle device 5 mainly into the center side of the rotating air filter fa. The dust D captured by the air filter fa is blown away while moving in such a direction. Of course, it is possible to remove the dust D by the nozzle body 51 under consideration that the dust D is not pushed into the filter element on the outer peripheral side of the air filter fa. In this operation, the air regulator dial 23A is adjusted to obtain air discharge from the nozzle body 51 at an appropriate pressure.
As described above, as the operation of the operator, the air filter fa that is the object to be processed is maintained in the rotating state even if only the operation of taking the nozzle main body 51 out of the processing chamber 20b is performed. It is possible to remove the dust D that has been uniformly captured by the air filter fa. The removed dust D is sequentially sucked out by the action of the suction device 3.

(Ii) Modified air filter fa
On the other hand, as a special example, some air filters fa have irregular shapes that are not cylindrical.
In such a case, the air filter fa is supported by the support roller 24 and the center roller 25 without being rotationally driven, and is placed in the processing chamber 20b. That is, the center roller 25 is not driven, and the operation is performed in a so-called stationary state.
In this case, when the discharge nozzle device 5 is operated, the discharge nozzle device 5 is operated in such a direction as to be taken in and out of the processing chamber 20b, and sequentially ejected so that the dust D can be uniformly removed over the entire periphery of the air filter fa. The dust D is removed over the entire circumference while changing the angle.
Even if the air filter fa has such a shape, it can be processed in any form as long as it can be stored in the drum body 20.

(Iii) Cleaning the DPFfd The DPFfd takes the form of a ceramic block in which a number of long holes are formed so as to follow the flow direction of the exhaust gas. Unlike the air filter fa, the DPFfd is formed by the discharge nozzle device 5 from the center. The dust D is not removed, and air is blown out from the upstream end of the exhaust toward the downstream.
In the case of DPFfd, the processing while rotating the object to be processed is not performed as in the case of the different-diameter air filter fa. In this case, the compressed air is blown onto the end face of the DPF fd, and dust D such as exhaust carbon adhering to the surface of the DPF fd is removed by the impact. The discharge state of the compressed air at this time is set by the air regulator dial 23A, and can be set to a pressure suitable for the properties of the object to be processed.
The dust D released from the DPF fd reaches the recovery device 4 by the suction action of the suction device 3 and is collected by the bag filter 42.

[Other Embodiments]
The present invention is based on the embodiment described above as one basic technical idea, but the following modifications can be considered.
That is, in the embodiment described above, the suction device 3 and the recovery device 4 are mounted on the frame 1 in addition to the cleaning drum unit 2, but the suction device 3 and the recovery device 4 are not mounted integrally, It is also possible to use an existing vacuum cleaner or an existing vacuum pipe.
Moreover, supply of the compressed air to the discharge nozzle device 5 may be performed by mounting an air compressor on the frame 1 in addition to the supply from the existing pipe.
In addition, although the application example was shown about the air filter fa for vehicles, and DPFfd for exhaust gas purification | cleaning as a process target of this invention, it applies to dust collection filters f, such as an appropriate air-conditioner filter, and performs dust D removal. Needless to say, you can. Further, the dust collector includes a floor mat, an ashtray and the like.

C Cleaning device D Dust E Engine f Dust collection filter fa Air filter fd DPF
W Foreign matter

1 frame 10 caster 11 drum support bracket 12 dust collection table

2 Cleaning drum unit 20 Drum body 20a Upper opening 20b Processing chamber 21 Bottom hopper 22 Upper panel 22A Overhang portion 23 Control switch 23A Air regulator dial 24 Support roller 25 Center roller 25a Driving surface

26 Bearing Stay 27 Suction Port 27a Suction Pipe 28 Suction Port Cover (Type with Upper Lid)
28A Suction port cover (Cylindrical type)
28c Upper lid 28m Upper opening

3 Suction Device 30 Suction Blower 31 Suction Hose 32 Discharge Hose

4 collection device 41 dust collection drum 42 bag filter 43 collection bag 43A constricted portion 43B cyclone reversing portion 43C dust collection portion 44 cyclone guide 45 dust receiving hole 46 regulating ring

5 Discharge nozzle device 51 Nozzle body 52 Air hose 53 Air source hose joint

Claims (5)

A cylindrical drum body having a processing chamber inside, a suction device that is connected to the drum body and sucks air in the processing chamber, and a blowout nozzle device that can be inserted into the processing chamber of the drum main body. A device that removes dust collected by the dust collector by the air blown from the blowing device while operating the suction device in a state of receiving the collecting body, and discharges the dust from the drum body by the suction device. ,
The drum body is provided in an inclined state, and in the processing chamber of the drum body, at least a pair of support rollers arranged in an axial direction along the inner wall of the drum, and a direction substantially orthogonal to the support roller near the bottom of the processing chamber And a center roller provided on a line passing through substantially the center of the bottom, and the support roller and the center roller are in a state in which one or both of them can be driven. apparatus.   2. The dust collector cleaning device according to claim 1, wherein a support action surface of the center roller is in a center-lowered state.   3. The dust collector cleaning device according to claim 1, wherein a suction port cover for collecting foreign matter is provided inside the drum main body at a portion to which the suction device is connected.   The suction device for sucking the processing chamber air further connects a recovery device at the subsequent stage, and both the suction device and the recovery device are mounted on a frame that supports the drum body. The dust collector cleaning device according to claim 1, 2, or 3. The collection device comprises a dust collecting drum having a short cylindrical shape in the vertical direction, a bag filter provided above the collection drum, and a collection bag provided below the bag filter,
A dust receiving hole is formed so that the air guiding direction is a tangential direction with respect to the dust collecting drum, and the inner side of the dust collecting drum has an inner flange shape that is constricted above the dust receiving hole. Cyclone guide is provided,
On the other hand, the collection bag has a constricted portion in the vertical direction, and the dust collecting drum and the cyclone reversing portion above the constricted portion of the collection bag cooperatively constitute a cyclone action portion, and the cyclone action The dust collector cleaning device according to claim 4, wherein the main recovery of the dust is performed by the method.

Images