JP2009297845A - Grinding material collecting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding material collecting apparatus capable of preventing the number of man-hours for collecting a grinding material from being increased. <P>SOLUTION: This grinding material collecting apparatus includes a brush section 30 disposed under a bottom plate 21, an air motor 117 serving as the drive source of the brush section 30, and a suction nozzle 41 connected to a vacuum ejector 133 through a pipe. The grinding material stacked on a floor surface is swept off by the brush section 30 which is rotated by the drive force of the air motor 117 and sucked by the suction nozzle 41. The apparatus is run by the reaction force produced between the brush section 30 and the floor surface when the brush section 30 is rotated. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an abrasive recovery device that recovers an abrasive accumulated on a floor surface by blasting.

  In order to prevent corrosion of the steel material constituting the hull, the surface of the steel material is coated with anticorrosion. At this time, in order to improve the adhesion between the steel material surface and the coating film, the steel material surface is subjected to a blasting treatment as a base treatment before painting. For example, in a blasting operation in a ballast tank, an operator wears a dedicated protective device and enters the ballast tank. Then, the abrasive is ejected from a dedicated hose for ejecting the abrasive, and the abrasive is made to collide with the steel plate surface in the ballast tank to remove rust and dirt. After the blasting operation, the abrasive that has fallen and accumulated on the floor surface in the ballast tank by the blasting operation is collected by the operator using a vacuum hose connected to a suction source.

  In order to extend the life of the hull, it is important to prevent corrosion of the steel material that constitutes the hull. Now that welding technology and corrosion protection of steel materials have been developed, the life of the coating applied to the surface of the steel material for corrosion protection has greatly influenced the life of the hull. In particular, a ballast tank for injecting seawater when there is no cargo to enable stable navigation of the hull is in a severe corrosive environment due to seawater. Therefore, extending the paint life in the ballast tank is very important for increasing the life of the hull.

  In order to extend the coating life, higher quality surface treatment is required for the steel surface. For this reason, the amount of blasting increases, and the amount of abrasive that falls and accumulates on the floor surface also increases. Conventionally, the recovery of the abrasive material deposited on the floor surface has been performed by an operator, and as the amount of the abrasive material deposited on the floor surface increases, the recovery man-hour of the abrasive material increases. There was a problem.

  The present invention has been made to solve the above-described problems, and even if the amount of abrasive material deposited on the floor surface increases due to an increase in the amount of blasting, the recovery man-hour of the abrasive material increases. It is an object of the present invention to provide a polishing material recovery apparatus that does not have any problem.

  A polishing material recovery apparatus according to the present invention includes a brush portion disposed below a main body portion, an air motor serving as a driving source for the brush portion, and a suction nozzle connected to a suction means by piping. The brush portion rotated by the driving force of the motor sweeps up the abrasive accumulated on the floor surface, sucks the abrasive from the suction nozzle, and the brush portion and the brush when the brush portion rotates. It is self-propelled by the reaction force generated between it and the floor.

  In the abrasive material recovery device according to the present invention, during the blasting operation, the abrasive material recovery device recovers the abrasive material deposited on the floor surface while traveling on the floor surface. That is, the abrasive material recovery device automatically recovers the abrasive material deposited on the floor without the assistance of an operator. For this reason, since it is not necessary for an operator to remove the polishing material deposited on the floor surface after the blasting operation, it is possible to prevent an increase in the number of removal steps of the polishing material.

  Moreover, the abrasive recovery device according to the present invention can be self-propelled by being connected to an air source and does not require a power source. In general, an air source (including a relay part connected to an air source remote from the blasting work station) is provided in the vicinity of the blast working place to eject the abrasive from the hose. On the other hand, there are many cases where no power source is provided in the vicinity of the blast work place. Since the abrasive recovery device according to the present invention can be self-propelled by being connected to an air source, it is not necessary to install an electric wire for supplying power from a power source remote from the blast work place.

Embodiment.
Hereinafter, the abrasive recovery device in the present embodiment will be described. In the present embodiment, the case where the abrasive recovery device is used in the ballast tank will be described.

  There are various ship hull structures depending on the type of ship. For example, bulk carriers, tankers, LPG or LNG ships have a double bottom structure. And in the double bottom structure, the inside is normally utilized as a ballast tank.

FIG. 1 is an overall perspective view of a ballast tank according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state where the abrasive recovery device in the embodiment of the present invention is used in this ballast tank.
The ballast tank 1 is formed by closing a gap between the outer plate 2 and the double bottom plate 3 with a girder (vertical girder material) 16 and a transformer (horizontal girder material) 5. In the ballast tank 1, a plurality of outer plate longages 6a are erected through the transformer 5 on the bottom surface (outer plate 2 side), and a plurality of outer plate longages 6a pass through the transformer 5 on the upper surface (double bottom plate side). Double bottom longi 6b is erected. Further, between the outer plate long 6a and the double bottom long 6b, a stiffener 7 in which an upper end, a lower end, and a side edge are welded to the outer plate long 6a, the double bottom long 6b, and the transformer 5, respectively. Is provided. Further, the transformer 5 is formed with a manhole 8 for an operator to enter and leave the ballast tank 1.

  Since the abrasive material recovery device 10 is brought into the ballast tank 1 from the manhole 8, the size of the abrasive material recovery device 10 is smaller than that of the manhole 8. Then, as shown in FIG. 2, the abrasive material recovery device 10 brought into the ballast tank 1 from the manhole 8 has an air hose 100 and an abrasive material recovery hose 150 mounted on the upper portion thereof, and between the outer plate longages 6a. Placed in. Further, the air hose 100 and the abrasive material recovery hose 150 are hung with a slack, for example, by a hook provided on the double bottom longitudinal 6b so as not to hinder the self-propelled material of the abrasive material recovery device 10. ing. Then, the abrasive recovery device 10 is self-propelled by the compressed air pumped from the outside of the ballast tank 1 through the air hose 100 without the help of an operator, and the outer plate longi is blasted in the ballast tank 1. The polishing material deposited between 6a is collected. The collected abrasive is discharged out of the ballast tank 1 through the abrasive collection hose 150.

  Note that the polishing material recovery operation by the polishing material recovery device 10 may be performed while the worker is performing the blasting operation in the ballast tank 1 or may be performed after the blasting operation is completed. Further, in the present embodiment, the abrasive material collected by the scouring material collecting device 10 is directly discharged out of the ballast tank 1 through the scouring material collecting hose 150. The collected polishing material may be discharged to the outside of the ballast tank 1 after being stored in a collection tank or the like provided in the ballast tank 1.

(Construction)
Next, the structure of the abrasive recovery device 10 will be described.
3 and 4 are overall perspective views of the abrasive material recovery device according to the embodiment of the present invention. FIG. 3 is an overall perspective view of a state where a cover is attached. FIG. 4 is an overall perspective view of a state where the cover is removed. Indicates. FIG. 5 is a perspective view showing the back side of the scouring material recovery apparatus. The structure of the abrasive material recovery apparatus 10 in the present embodiment will be described with reference to FIGS.

The scouring material recovery apparatus 10 includes a main body 20, a brush part 30, a suction port 41, and the like.
The main body 20 includes a bottom plate 21, a support column 22, a top plate 23, a cover 24, a gripping portion 25, wheels 26, and the like. A plurality of support posts 22 are erected on the upper surface of the substantially disc-shaped bottom plate 21, and a substantially disc-shaped top plate 23 that is slightly smaller than the bottom plate 21 is provided at the upper end portion of the support post 22. Yes. A plurality of wheels 26 are rotatably provided on the bottom surface of the bottom plate 21. A cover 24 is provided so as to enclose between the bottom plate 21 and the top plate 23. The cover 24 has a hollow cylindrical shape 24a and an upper portion of the cylindrical portion 24a, and a conical portion 24b whose diameter is reduced upward is integrally formed. In addition, a plurality of gripping portions 25 are attached to the conical portion 24b in order to facilitate carrying of the scouring material collecting apparatus 10. In addition, each wheel 26 can change the wheel height (the distance between the floor surface and the bottom plate 21). By changing the wheel height, an angle θ (shown in FIG. 6) between a brush portion 30 and a floor surface described later can be changed.

  The brush portion 30 includes a substantially disc-shaped plate member 31 and a plurality of brushes 32 erected on the plate member 31 in a substantially circular shape. In the brush portion 30, a plate member 31 is provided below the bottom plate 21 so as to face the bottom plate 21 of the main body portion 20, and an air motor in which a substantially central portion of the plate member 31 is provided at a substantially central portion of the bottom plate 21. 117 is connected to the rotation shaft. As the rotation shaft rotates, the brush portion 30 also rotates, and the scouring material collecting apparatus 10 self-runs due to the reaction force generated between the brush portion 30 and the floor surface.

  As described above, the abrasive recovery device 10 according to the present embodiment can change the angle θ between the brush portion 30 (the tip of the brush 32) and the floor surface. By providing the angle θ between the brush portion 30 and the floor surface, the brush 32 comes into contact only with the floor surface on one side (the right side in FIG. 6) of the abrasive recovery device 10. Thereby, the self-propelled material recovery device 10 is facilitated. In the abrasive material recovery device 10 according to the present embodiment, the angle θ between the brush portion 30 and the floor surface is adjusted in the range of 0 ° ≦ θ ≦ 3 °. In the present embodiment, the angle θ between the brush portion 30 and the floor surface is adjusted by adjusting the wheel height, but the angle θ between the brush portion 30 and the floor surface may be adjusted by other configurations. . For example, the air motor 117 to which the brush portion 30 is connected is provided in a member that is a separate component from the bottom plate 21, and the angle θ between the brush portion 30 and the floor surface is adjusted by adjusting the angle between this member and the bottom plate 21. May be.

  The suction port 41 has a shape in which a hollow cylindrical pipe is bent into a substantially U-shape, and is provided on the outside of the brush portion 30 below the bottom plate 21 so that both ends are on the floor surface side. ing. In addition, the suction port 41 is provided with a connection port 41 a in a direction substantially opposite to both ends, and the connection port 41 a projects through the bottom plate 21 and projects above the bottom plate 21. The connection port 41a is connected to a suction port of a vacuum ejector 133 (shown in FIG. 7) serving as a suction source.

  The top plate 23 of the main body 20 is provided with pipe connection portions 101 and 102 connected to the air motor 117, the vacuum ejector 133, and the like. By connecting the air hose 100 (100a, 100b) to the pipe connection portions 101, 102, the compressed air can be pressure-fed to the air motor 117, the vacuum ejector 133, and the like. Further, the top plate 23 is also provided with a pipe connection portion 151 connected to the exhaust port of the vacuum ejector 133. By connecting the polishing material recovery hose 150 to the pipe connection portion 151, the polishing material sucked from the suction port 41 can be discharged out of the ballast tank 1.

  In addition to the air motor 117 and the vacuum ejector 133, pneumatic equipment and the like for configuring the scouring material recovery device 10 are disposed in the main body 20. Hereinafter, the arrangement positions of these pneumatic devices and the like will be described with reference to FIGS. 6 and 7, and the connection relationship of these pneumatic devices and the like will be described with reference to FIG.

FIG. 6 is a longitudinal sectional view of the abrasive recovery device in the embodiment of the present invention. FIG. 7 is a cross-sectional view taken along the line AA of FIG. FIG. 8 is a pneumatic circuit diagram of the scouring material recovery apparatus. In order to facilitate understanding of the drawing, in FIG. 8, piping connected to the pilot port of the air operated valve is indicated by a broken line.
A pipe connecting portion 101 to which the air hose 100a is connected is provided on the top plate 23 (FIG. 6), and an air operated valve 116 (see FIG. 8) provided on the pipe branching portion 103 (shown only in FIG. 8) and the bottom plate 21. 7) is connected to the connection port 116a. The connection ports 116b and 116c of the air operated valve 116 are connected to the connection ports 117a and 117b (shown only in FIG. 8) of the air motor 117 via the expansion devices 118a and 118b, respectively.

  The pipe branching portion 103 is connected to mechanical valves 111 and 131 (FIG. 6) provided on the top plate 23. The mechanical valve 111 is connected to a connection port 112a of the air operated valve 112 and a connection port 113a of the air operated valve 113, and these air operated valves 112 and 113 are provided on the bottom plate 21 (FIG. 7). The air operated valve 112 is connected to the connection port 114 a of the time delay valve 114 (FIG. 7) provided in the bottom plate 21 with the connection port 112 b and the tank 114 c, and the time delay valve provided in the bottom plate 21 with the connection port 112 c. 115 (FIG. 7) is connected to the connection port 115a and the tank 115c. Further, expansion devices 114d and 115d are provided between the connection port 112b and the tank 114c and between the connection port 112c and the tank 115c, respectively.

  The air operated valve 113 has a connection port 113b connected to the pilot port 112d of the air operated valve 112 and the pilot port 116d of the air operated valve 116, and the connection port 113c connected to the pilot port 112e of the air operated valve 112 and the air operated valve 116. Of the pilot port 116e. The pilot port 113 d of the air operated valve 113 is connected to the connection port 114 b of the time delay valve 114, and the pilot port 113 e of the air operated valve 113 is connected to the connection port 115 b of the time delay valve 115.

  On the other hand, the pipe connection part 102 to which the air hose 100b is connected is connected to a connection port 132a of an air operated valve 132 (FIG. 7) provided on the bottom plate 21. The air operated valve 132 has a connection port 132 b connected to a vacuum ejector 333 provided on the bottom plate 21, and a pilot port 132 c connected to a mechanical valve 131.

(Description of operation)
Hereinafter, the operation of the abrasive material recovery apparatus 10 will be described with reference to FIG.
The compressed air supplied via the air hose 100a and the pipe connection part 101 is pressure-fed to the air operated valve 116 and the pipe branching part 103. The compressed air that has been pressure-fed to the pipe branching portion 103 is pressure-fed to the mechanical valves 111 and 131.

  By operating the toggle lever of the mechanical valve 111, the compressed air is started to be sent to the downstream side of the mechanical valve 111. Part of the compressed air pressure-fed to the air operated valve 113 is pressure-fed to the pilot port 112d of the air operated valve 112, and the air operated valve 112 is in a state where the connection port 112a and the connection port 112b are connected. As a result, the compressed air sent to the air operated valve 112 is sent to the connection port 114a of the time delay valve 114 and the tank 114c.

  Further, the remaining part of the compressed air pressure-fed to the air operated valve 113 is pressure-fed to the pilot port 116d of the air operated valve 116, and the air operated valve 116 is connected to the connection port 116a and the connection port 116b. . Thereby, the compressed air pressure-fed to the air operated valve 116 is pressure-fed to the air motor 117 from the connection port 117a, and the rotation shaft of the air motor 117 rotates. The compressed air pressure-fed to the air motor 117 is discharged from the connection port 117b, and is discharged from the exhaust port of the air operated valve 116 through the expansion device 118b. At this time, the rotational speed of the air motor 117 can be adjusted by adjusting the opening degree of the expansion device 118b.

  As the rotation shaft of the air motor 117 rotates, the brush unit 30 connected to the rotation shaft also rotates. Then, the blasting operation in the ballast tank 1 sweeps up the polishing material deposited on the floor surface between the outer plate longages 6a, and the scouring material recovery device 10 by the reaction force generated between the brush portion 30 and the floor surface. Self-propelled. For example, if the scouring material collecting device 10 starts to self-propel to the front side of FIG. 2, the self-propelling direction is caused by the resistance of the scouring material accumulated on the floor surface or the collision with the side surface of the outer plate longage 6a. Although it changes, the scouring material recovery apparatus 10 is self-propelled generally toward the front side of FIG.

  The compressed air sent to the tank 114c of the time delay valve 114 is stored in the tank 114c. When a predetermined time elapses, the tank 114c is filled with compressed air, and the time delay valve 114 is switched to a state in which the connection port 114a and the connection port 114b are connected. The compressed air pressure-fed to the connection port 114a of the time delay valve 114 is pressure-fed to the pilot port 113e of the air operated valve 113, and the air operated valve 113 is connected to the connection port 113a and the connection port 113c. The time until the time delay valve 114 is switched (predetermined time) can be adjusted by adjusting the opening of the expansion device 114d.

  When the connection port 113a and the connection port 113c are connected, a part of the compressed air pressure-fed to the air operated valve 113 is pressure-fed to the pilot port 112e of the air operated valve 112, and the air operated valve 112 is connected. The port 112a and the connection port 112c are connected. As a result, the compressed air sent to the air operated valve 112 is sent to the connection port 115a of the time delay valve 115 and the tank 115c. At this time, the tank 114c of the time delay valve 114 is connected to the exhaust port of the air operated valve 112, and the compressed air filled in the tank 114c is discharged to the outside.

  Further, the remaining part of the compressed air pressure-fed to the air operated valve 113 is pressure-fed to the pilot port 116e of the air operated valve 116, and the air operated valve 116 is connected to the connection port 116a and the connection port 116c. . Thereby, the compressed air pressure-fed to the air operated valve 116 is pressure-fed from the connection port 117b to the air motor 117, and the rotation shaft of the air motor 117 rotates in the reverse direction. The compressed air pressure-fed to the air motor 117 is discharged from the connection port 117a, and is discharged from the exhaust port of the air operated valve 116 through the expansion device 118a. At this time, the rotational speed of the air motor 117 can be adjusted by adjusting the opening degree of the expansion device 118a.

  When the rotation direction of the rotation shaft of the air motor 117 is reversed, the brush portion 30 connected to the rotation shaft also changes the rotation direction. Then, the blasting operation in the ballast tank 1 sweeps up the polishing material accumulated on the floor surface between the outer plate longages 6a, and the scouring material recovery device 10 by the reaction force generated between the brush portion 30 and the floor surface. Runs in the opposite direction. For example, if the self-propelled direction of the scouring material recovery device 10 is on the heel side of FIG. 2, the self-propelled direction is due to the resistance of the scouring material accumulated on the floor surface or the collision with the side surface of the outer plate longitudinal 6a. Although it changes, the scouring material recovery device 10 is generally self-propelled toward the heel side of FIG.

  The compressed air pressure-fed to the tank 115c of the time delay valve 115 is stored in the tank 115c. When a predetermined time elapses, the tank 115c is filled with compressed air, and the time delay valve 115 is switched to a state where the connection port 115a and the connection port 115b are connected. The compressed air pressure-fed to the connection port 115a of the time delay valve 115 is pressure-fed to the pilot port 113d of the air operated valve 113, and the air operated valve 113 is connected to the connection port 113a and the connection port 113b. Note that the time (predetermined time) until the time delay valve 115 is switched can be adjusted by adjusting the opening of the expansion device 115d.

  By repeating the above operation, the abrasive material recovery device 10 self-propels the floor surface between the outer plate longages 6a in a random direction and sweeps up the abrasive material deposited on the floor surface.

  On the other hand, the compressed air supplied via the air hose 100 b and the pipe connection portion 102 is pressure-fed to the air operated valve 132. By operating the toggle lever of the mechanical valve 131, the compressed air sent to the mechanical valve 131 is sent to the pilot port 132c of the air operated valve 132, and the connection port 132a and the connection port 132b are connected to the air operated valve 132. It becomes a state. Thereby, the compressed air pressure-fed to the air operated valve 132 is pressure-fed to the vacuum ejector 133.

  When compressed air is pumped to the vacuum ejector 133, the vacuum ejector 133 has a negative pressure. The scouring material recovery device 10 sucks the scouring material that the brush unit 30 has swept up from the floor surface by this negative pressure from the suction port 41, and then scours the scouring material out of the ballast tank 1 through the scouring material recovery hose 150. Is discharged.

  In the scouring material recovery device configured as described above, during the blasting operation, the scouring material recovery device 10 recovers the scouring material deposited on the floor surface while traveling on the floor surface between the outer plate longages 6a. That is, the abrasive material recovery device 10 automatically recovers the abrasive material deposited on the floor without the assistance of an operator. For this reason, since it is not necessary for the operator to remove the polishing material deposited on the floor surface after the blasting operation, it is possible to prevent the number of removal steps of the polishing material from increasing.

  Further, the abrasive recovery device 10 can be self-propelled by connecting to the air hose 100a (air source), and does not require a power source. In general, an air source (including a relay part connected to an air source remote from the blasting work station) is provided in the vicinity of the blast working place to eject the abrasive from the hose. On the other hand, there are many cases where no power source is provided in the vicinity of the blast work place. Since the abrasive recovery device 10 is capable of self-propelled by being connected to an air source, it is not necessary to install an electric wire for supplying power from a power source remote from the blast work place.

  Moreover, since the rotation direction of the brush part 30 switches in predetermined time, the scouring material collection | recovery apparatus 10 can be self-propelled in the random direction on the floor surface between outer-plate longi 6a, and the scouring material collection | recovery efficiency Will improve. Further, the switching of the self-running direction (the rotating direction of the brush unit 30) and the adjustment of the switching time are performed by the air operated valves 112 and 113 and the time delay valves 114 and 115. For this reason, the power supply to the scouring material recovery apparatus 10 is not required for the switching of the self-running direction of the scouring material recovery apparatus 10 and the adjustment of the switching time, and power is supplied from a power source remote from the blast work place. There is no need to install any wires.

  Further, since the brush 32 is provided with the brush 32 in a substantially circular shape, the self-running direction of the scouring material recovery device 10 becomes a more random direction, and the recovery efficiency of the scouring material is improved.

In the present embodiment, the case where the abrasive material recovery device 10 is used in the ballast tank 1 has been described, but it can of course be used in other blast works.
Further, although the vacuum ejector 133 is used as a suction source for collecting the abrasive, other suction sources may be used. Further, the shape of the suction port 41 is not limited to the shape of the present embodiment, and various shapes are possible. For example, a rectangular suction port that is substantially parallel to the floor surface may be used, or a substantially circular suction port that surrounds the brush portion 30 may be used. The number of suction ports 41 is not limited.
Moreover, the shape of the brush part 30 is not limited to this Embodiment, Various shapes are possible. For example, a cylindrical brush portion that rotates substantially parallel to the floor surface may be used. A plurality of brush portions (for example, in a polygonal shape with respect to the floor surface) may be arranged.

It is a whole perspective view of the ballast tank in an embodiment. It is a perspective view which shows the state which is using the scouring material collection | recovery apparatus in embodiment in a ballast tank. It is the whole perspective view of the state where the cover of the scouring material collection device in an embodiment was equipped. It is the whole perspective view of the state where the cover of the scouring material collection device in an embodiment was removed. It is a perspective view which shows the back side of the scouring material collection | recovery apparatus in embodiment. It is a longitudinal cross-sectional view of the scouring material collection | recovery apparatus in embodiment. It is AA sectional drawing of FIG. It is a pneumatic circuit diagram of the abrasive material recovery device in the embodiment.

Explanation of symbols

  1 Ballast tank, 2 Outer plate, 3 Double bottom plate, 4 Girder, 5 Transformer, 6a Outer plate longi, 6b Double bottom longi, 7 Stiffener, 8 Manhole, 10 Abrasive recovery device, 20 Main body, 21 Bottom plate, 22 columns, 23 top plate, 24 cover, 24a cylindrical part, 24b conical part, 25 gripping part, 26 wheels, 30 brush part, 31 plate member, 32 brush, 41 suction port, 41a connection port, 100 (100a, 100b) Air hose, 101 Piping connection, 102 Piping connection, 103 Piping branch, 111 Mechanical valve, 112 Air operated valve, 112a-112c connection port, 112d, 112e Pilot port, 113 Air operated valve, 113a-113c connection port, 113d, 113e Pilot port, 114 Time delay valve, 114a, 114b connection port, 114c tank, 114d throttle device, 115 Time delay valve, 115a, 115b connection port, 115c tank, 115d throttle device, 116 Air operated valve, 116a-116c connection port, 116d, 116e Pilot Port, 117 Air motor, 118a, 118b Throttle device, 131 Mechanical valve, 132 Air operated valve, 132a, 132b Connection port, 132c Pilot port, 133 Vacuum ejector, 150 Abrasive material recovery hose, 151 Piping connection.

Claims (5)

A plurality of wheels rotatably provided at the bottom of the main body,
A brush part disposed below the main body part;
An air motor as a drive source of the brush part;
A suction port piped to the suction means;
With
The brush portion that is rotated by the driving force of the air motor sweeps up the abrasive material deposited on the floor surface, and the abrasive material is sucked from the suction port,
The abrasive material recovery device, which is self-propelled by a reaction force generated between the brush portion and the floor surface when the brush portion rotates.   The abrasive recovery device according to claim 1, wherein the rotation direction of the brush portion is switched at a predetermined time. A switching valve for switching the rotation direction of the air motor is piped to the air motor,
3. The abrasive recovery device according to claim 2, wherein the pipe switching time of the switching valve is adjusted by a time delay valve.   The said brush part is circular shape, The polishing material collection | recovery apparatus as described in any one of Claims 1-3 characterized by the above-mentioned.   The angle of the said brush part and a floor surface is adjustable, The scouring material collection | recovery apparatus as described in any one of Claims 1-4 characterized by the above-mentioned.

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