JP2012086133A - Device for cleaning inside duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for cleaning inside a duct usable regardless of the angle of orientation of the duct with respect to a duct having a circular cross section various in size and changed in diameter on the way and capable of cleaning the inner surface of the duct.SOLUTION: The device 1 for cleaning inside the duct for cleaning the inner surface of the duct 2 having a circular cross section includes: a rotary drive means 6; a rotary member 62 attached to the rotary drive means and rotatable in the peripheral direction of the duct; a plurality of rod-shaped members 61 attached to the rotary member so as to be oriented in a radial direction in a manner movable in a radial direction; an elastic member 66 for energizing the rod-shaped members 61 to the inside in the radial direction; a cleaner 5 provided to the outside end part in the radial direction of the rod-shaped member; and an endless track device 3 having an adsorbing member provided to an earthing part 52a and is equipped with a running drive means 40 capable of advancing forward and rearward in the axial direction of the duct.

Description

  The present invention relates to an in-duct cleaning device for cleaning a duct such as an exhaust, particularly an inner surface of a duct having a circular cross section.

Conventionally, when cleaning an exhaust duct having a circular cross section, it has been often performed manually or by a dust collector. However, it has been difficult to reliably and easily remove contamination adhered to the inner surface of the duct.
Therefore, for example, an inner surface cleaning device for a tubular member having a rotating brush as shown in Patent Documents 1 and 2 has been proposed.

However, what is disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 3-188980) is a duct inner surface cleaning device provided with a brush that spreads brush ears by rotation on a shaft rotated by an air motor. Therefore, it is necessary to replace the brush depending on the duct diameter.
Further, this mechanism cannot be applied to a duct extending in the vertical direction.
In Patent Document 2 (Japanese Patent Laid-Open No. 6-277640), a spring is disposed inside a radially arranged brush so as to urge the brush in the outer circumferential direction, and such a brush is circularly arranged. The inner surface of the circular tube is cleaned by rotating in the circumferential direction of the tube. Therefore, the brush is always urged in the outer circumferential direction and tries to protrude, and thus the compactness of the apparatus cannot be obtained.
In addition, since the brush rotates passively with the water flow that flows in the circular pipe, it is not active rotation. Depending on the water flow, an additional mechanism such as a speed increasing mechanism may be required, and depending on the diameter of the circular pipe. There are strong restrictions and poor versatility.

Japanese Patent Laid-Open No. 3-188980 (FIG. 1) JP-A-6-277640 (FIG. 1)

The present invention provides an in-duct cleaning device capable of cleaning the inner surface of a duct, which can be used regardless of the orientation angle of the duct, with respect to a duct having a circular cross section whose diameter changes in the middle in various sizes. Is an issue.
It is another object of the present invention to provide an in-duct cleaning device that has explosion-proof properties against flammable gas and dust generated by dust removal and is easy to remote control.

  In order to solve the above-mentioned problems, the invention according to claim 1 is an in-duct cleaning device for cleaning the inner surface of a duct having a circular cross section. The rotation drive means and the rotation drive means are attached to the rotation drive means. A rotating member that is rotatable in the circumferential direction, a plurality of rod-shaped members that are radially oriented and attached to the rotating member so as to be movable in the radial direction, and an elastic member that urges the rod-shaped member inward in the radial direction And a cleaning tool provided at the radially outer end of the rod-shaped member, and an endless track device including a suction drive member at the ground contact portion and a traveling drive means capable of moving back and forth in the axial direction of the duct. This is an in-duct cleaning device.

  According to a second aspect of the present invention, in the in-duct cleaning device according to the first aspect, a plurality of the endless track devices are arranged in a circumferential direction of the duct, and can be expanded and contracted in a radial direction of the duct. A drive means is provided.

  According to a third aspect of the present invention, in the duct internal cleaning device according to the second aspect, the expansion / contraction driving means connects the expansion / contraction link mechanisms of the endless track devices to each other and drives them together. The expansion / contraction link mechanisms are configured to have the same expansion / contraction displacement in the radial direction.

  According to a fourth aspect of the present invention, in the duct cleaning device according to any one of the first to third aspects, the attraction member is a permanent magnet.

  According to a fifth aspect of the present invention, in the in-duct cleaning device according to any one of the first to fourth aspects, the rotation driving unit and the driving unit related to the endless track device are driven by compressed air for driving. It is characterized by that.

According to the in-duct cleaning device of the first aspect of the present invention, when the rotation driving unit drives the rotation member to rotate, the plurality of rod-like members attached to the rotation member move outward in the radial direction by centrifugal force. Therefore, in a state where the cleaning tool provided at the radially outer end of the rod-shaped member is in contact with the inner peripheral surface of the duct, the rod-shaped member rotates and the inner surface of the duct is cleaned.
Since a plurality of rod-like members provided with the cleaning tool are provided, it can be arranged so as to be balanced during rotation.
Since the rod-shaped member is urged radially inward by the elastic member, it can move closer to the center of the rotating member when not in operation (non-rotating), and the duct cleaning device can be made compact. The movement of the duct cleaning device is facilitated.
On the other hand, the rod-shaped member can be moved by centrifugal force against the elastic member until the cleaning tool abuts on the inner peripheral surface of the duct. Cleaning can be performed corresponding to ducts of various diameters without exchanging members.

Since the in-duct cleaning device has an endless track device having travel driving means, the inner surface of the duct can be sequentially cleaned in the axial direction by moving in the axial direction of the duct.
Therefore, the inside of the duct can be cleaned without entering a duct.
In addition, since the endless track device is provided with an adsorbing member in the ground contact portion, it can move in the axial direction in the vertical duct without sliding down, and thus is not restricted by the orientation angle of the duct.
Moreover, since the diameter of the duct is not selected within a predetermined range, it is easy to cope with the case where the diameter of the duct changes as the duct cleaning device moves.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the endless track device can easily cope with ducts having various sizes and circular cross sections whose diameter changes midway. become.

  According to the invention of claim 3, in addition to the effect of the invention of claim 2, the expansion / contraction drive means simultaneously expands / contracts each expansion / contraction link mechanism of the plurality of endless track devices in the same amount in the radial direction. The rotation center of the rotating member can be made to coincide with the center of the duct, and the rod-shaped member provided with the cleaning tool is smoothly rotated, and the cleaning is made uniform.

  According to the invention of claim 4, in addition to the effect of the invention of any one of claims 1 to 3, when the duct is made of ordinary steel, the endless track device can be reliably adsorbed to the duct, and the vertical direction Application to the duct becomes easier.

  According to the invention of claim 5, in addition to the effect of the invention of any one of claims 1 to 4, the explosion-proof property is high against the flammable gas and dust generated by dust removal, and the compressed air for driving is used. By controlling the supply, remote control of the duct cleaning device is facilitated.

It is typical explanatory drawing which shows the use condition of the cleaning apparatus in a duct which concerns on one Embodiment of this invention. It is a side view which illustrated the air motor as a rotation drive means of the cleaning device in a duct concerning one embodiment of the present invention roughly. It is a III-III arrow line view in FIG. It is a side view of a traveling air motor as an endless track device and its traveling drive means. In FIG. 4, it is a VV arrow line view. In FIG. 4, it is a VI-VI arrow line view. It is explanatory drawing of the state by which the air motor as a rotation drive means was attached to the rotation member in FIG. In FIG. 7, it is explanatory drawing of the rotation member by a VIII-VIII arrow, a rod-shaped member, a cleaning tool, etc., and is also equivalent to the VIII-VIII arrow in FIG.

Hereinafter, an in-duct cleaning device according to an embodiment of the present invention will be described with reference to FIGS. In the description of the present specification, the term “rear” refers to the side where the compressed air tube for driving is extended in the axial direction of the duct when the cleaning device in the duct enters the duct, and the term “front” It is a reverse direction and is the side where the cleaning tool is provided in the axial direction of the duct. In the figure, the arrow FR indicates the front.
Moreover, the black arrow attached in the figure shows the operation direction of the member required for description typically.

  As shown in FIG. 1, the in-duct cleaning device 1 of this embodiment is inserted into a duct 2 having a circular cross section, moves forward and backward in the duct 2 by an endless track device 3, and the cleaning tool 5 is moved forward. Then, the air motor 6 (see FIG. 7) as a rotation driving means is rotated along the inner peripheral surface 2a of the duct 2 to clean the inner surface of the duct 2. In FIG. 1, the duct 2 is oriented substantially horizontally.

From the rear part of the in-duct cleaning device 1, a driving compressed air tube 7 for supplying or returning driving compressed air for driving each driving means in the in-duct cleaning device 1 extends.
The driving compressed air tube 7 is connected to the driving compressed air control / supply device 9 via an appropriate compressed air tube feeding / drawing device 8 if necessary.
A remote controller 10 is connected to the drive compressed air control / supply device 9, and the drive compressed air control / supply device 9 is controlled by the remote controller 10, thereby controlling the supply of drive compressed air. Each drive means of the duct cleaning device 1 is remotely controlled.

As will be described later, the endless track device 3 is provided with an adsorbing member at the ground contact portion, and does not slide down in the vertically oriented duct 2 'shown by the two-dot chain line in FIG. The inner surface of the directional duct 2 'can be cleaned.
Therefore, the in-duct cleaning device 1 of the present embodiment is applied without being restricted regardless of the orientation angle of the duct 2.

Based on FIG. 2, FIG. 3, the structure of the cleaning apparatus 1 in a duct of this embodiment is demonstrated.
The main body 11 of the in-duct cleaning device 1 is composed of a rear end plate 12, a front end plate 13, and three main shafts 14 that connect between them and are oriented in the front-rear direction.
The front and rear ends of the main shaft 14 are fastened to the front end plate 13 and the rear end plate 12 at three equal intervals on the same circle C as shown in FIG. 3, and the central axis of the circle C is The center axis X of the output shaft 6a of the air motor 6 as the rotation driving means is concentric, and the center axis X is also the rotation center axis of the rotating member 62 to which the rod-shaped member 61 provided with the cleaning tool 5 is attached.

A fixing bracket 31 is inserted into each main shaft 14 and fixed in contact with the front end plate 13, and a link pin hole 31 a is provided outside the fixing bracket 31 in the radial direction.
A first sliding bracket 32 and a second sliding bracket 33 are inserted between the fixed bracket 31 and the rear end plate 12 in order from the front, and are slidably mounted. The link pin holes 32a and 33a are respectively attached. Is provided.
A connecting rod 34 is fastened between the first sliding bracket 32A and the second bracket 32B to define the distance between them.

The main frame 35 of the endless track device 3 is oriented parallel to the outside in the radial direction of the main shaft 14, and is provided with link pin holes 35a and 35b from the front at the same interval as the link pin holes 32a and 33a.
Between the link pin hole 32a and the link pin hole 35a, and between the link pin hole 33a and the link pin hole 35b, link bars 36A and 36B having pin holes at both ends having the same length are connected by pin joining. The parallel link is configured.
The main frame 35 is composed of two parallel bar-shaped plate members spaced apart from each other (see FIGS. 5 and 6), and the link bars 36A and 36B have their end portions inserted between them and pin-joined.
A link pin hole 36Aa is also provided in the center of the link bar 36A, and a constraining link bar 37 having pin holes at both ends is pin-bonded between the link pin hole 31a of the fixed bracket 31.

The endless track device 3 is attached to each main shaft 14 via a similar link mechanism, and the respective first sliding brackets 32 are attached to a common connecting plate 21 and have the same longitudinal position. is doing.
A cylinder rod end 20a of an air cylinder 20 as an expansion / contraction drive means is attached to the connecting plate 21, the air cylinder 20 is disposed in the front-rear direction, and the rear end 20b is fixed to the rear end plate 12.

When the connecting plate 21 is moved in the front-rear direction by the air cylinder 20, all the first sliding brackets 32 are driven so as to move in the front-rear direction, and the link bar is pin-joined to the restraining link bar 37 by the link pin hole 36Aa. 36A changes the inclination, and the action of the parallel link causes the main frame 35 of the endless track device 3 to expand and contract in the same radial direction while maintaining parallel to the main shaft 14.
That is, each link mechanism forms an expansion / contraction link mechanism 38 having the same expansion / contraction displacement in the radial direction.
Accordingly, the connecting plate 21 constitutes a part of the expansion / contraction drive means that connects the expansion / contraction link mechanisms 38 together with the air cylinder 20 and drives them together.

In FIG. 2, the upper main shaft 14 is illustrated in a state of being positioned at the upper end of the circle C in the drawing, and shows the state where the endless track device 3 is extended outward in the radial direction. The cylinder rod end 20a, the connecting plate 21 and the first sliding bracket 32 of the air cylinder 20 are moved forward.
In FIG. 2, the lower main shaft 14 is illustrated in a state of being located at the lower end of the top circle C in the figure, and shows a state in which the endless track device 3 is retracted radially inward. The cylinder rod end 20a, the connecting plate 21 and the first sliding bracket 32 of the air cylinder 20 are moved rearward. In the endless track device 3 shown on the lower side, a traveling air motor 40 as traveling driving means is not shown.

As shown in FIG. 3, two air cylinders 20 as expansion / contraction drive means are provided at positions avoiding interference with the endless track device 3 and the travel air motor 40 as the travel drive means.
The connecting plate 21 is formed in a shape that avoids interference with the traveling air motor 40 and the expansion / contraction link mechanism 38 of the endless track device 3.

Based on FIGS. 4-6, the structure which concerns on the driving | running | working of the endless track apparatus 3 is demonstrated. 4 to 6 corresponds to the state of the endless track device 3 shown on the lower side in FIG.
The main frame 35 disposed in the front-rear direction is provided with a pair of rolling rollers 41 so as to sandwich the main frame 35, and chain drive sprockets 42 are provided behind the roller rollers 41. An endless chain 43 as an endless orbital belt that circulates around the main frame 35 is wound around the main frame 35 in total. As shown in FIG. 5, a driven sprocket 44 fixed coaxially is attached to one side of the chain drive sprocket 42.

  On the other hand, a traveling air motor mounting block 45 is fastened to the main frame 35 in the lateral direction. Between the traveling air motor mounting block 45 and the pressing member 46, the traveling air motor 40 has its output shaft 40a facing backward and forward and backward. And are sandwiched. A bevel gear 47 is attached to the output shaft 40a.

  A drive shaft support member 48 extends from the traveling air motor mounting block 45, and a drive shaft 49 having a bevel gear 49a meshing with the bevel gear 47 at a right angle is mounted. A drive sprocket 49b is fixed to the drive shaft 49, and a drive chain 50 is stretched between the drive sprocket 49b and the driven sprocket 44.

Therefore, when the travel air motor 40 rotates, the bevel gear 47 fixed to the output shaft 40a rotates, the bevel gear 49a of the drive shaft 49 that meshes with it rotates, and the drive sprocket 49b also rotates.
The rotation of the drive sprocket 49b is transmitted to the driven sprocket 44 on the main frame 35 side via the drive chain 50, and the chain drive sprocket 42 fixed coaxially rotates.
As a result, the endless chain 43 as an endless track wound around the chain drive sprocket 42 is driven to travel.

As shown in FIGS. 5 and 6, since the endless chain 43 is stretched over the main frame 35 of each endless track device 3, one end of the endless chain 43, so that each endless track device 3 is stable. Thus, it can be grounded to the duct inner peripheral surface 2a.
In this embodiment, every other link 51 of the endless chain 43 is provided with a laterally extending portion 51a and a grounding member 52 is attached, but the most grounded portion 52a is formed of a permanent magnet. Yes.

Therefore, if the duct 2 is made of ordinary steel, when the endless chain 43 is driven, the permanent magnets of the grounding portions 52a of the links 51 are sequentially attracted to the duct inner peripheral surface 2a when the endless chain 43 is driven. .
On the other hand, on the advancing rear side, the permanent magnets of the grounding portions 52a of the links 51 are sequentially separated from the duct inner peripheral surface 2a. However, the grounding portions 52a of the many grounded links 51 are attracted to the duct inner peripheral surface 2a. Therefore, the endless chain 43 as a whole can travel while maintaining the suction state on the duct inner peripheral surface 2a even when the endless track device 3 is traveling.
That is, in the endless track device 3 of the present embodiment, the grounding portion (adsorption member) 52a is formed of a permanent magnet, and when the duct is made of ordinary steel, the endless track device can be reliably attracted to the duct. The vertical duct 2 '(see FIG. 1) can be moved in the axial direction without slipping down, so that it is not restricted regardless of the orientation angle of the duct 2.

In this embodiment, a permanent magnet is used as the attracting member, but any other attracting member may be used as the attracting member depending on the material and usage state of the duct 2.
For example, each link 51 is provided with a suction cup as a grounding portion (adsorption member), and the expansion / contraction link mechanism 38 presses the endless track device 3 against the duct inner peripheral surface 2a. You may make it adsorb | suck by pressing against the internal peripheral surface 2a, and separating sequentially in back.

  A driving compressed air tube 7 connected to an air cylinder (extension / contraction driving means) 20 and a traveling air motor (traveling driving means) 40 as driving means related to the endless track device 3 extends rearward in an appropriate bundled form. Then, as described with reference to FIG. 1, if necessary, it is connected to a drive compressed air control / supply device 9 via a compressed air tube feeding / drawing device 8.

  As described above, the three endless track devices 3 are arranged at equal intervals in the circumferential direction around the main body 11 of the in-duct cleaning device 1, and the endless chain 43 as the endless track band is provided on the inner peripheral surface 2 a of the duct. The main frame 35 to which the endless chain 43 is attached is brought into contact with the cleaning device 1 in the duct, but the expansion and contraction link mechanisms 38 connected to each other by the connecting plate 21 have the same expansion and contraction displacement in the radial direction. The central axis X of the main body 11 of the duct cleaning device 1 always coincides with the central axis of the duct 2.

  In FIG. 2, a rotating shaft 62a of a rotating member 62 is supported at the center of a front end plate 13 via a bearing holder set 60 so as to be rotatable and non-movable in the axial direction. A rotating plate 62b is fixed perpendicularly to X.

FIG. 7 shows a state in which the air motor 6 as the rotation driving means is attached to the rotating member 62 in FIG. 2, and the cleaning tool 5, the rotating member 62, and the like of this embodiment will be described below.
The front end plate 13 is fastened with a hanger bracket 63 projecting rearward on one side (the upper side in the figure) passing the bearing holder set 60, and the air motor 6 is interposed between the hanger bracket 63 and the pressing member 64 at the rear end. The output shaft 6a faces forward and is oriented and sandwiched.

The output shaft 6a of the air motor 6 is connected so that the rotation shaft 62a of the rotation member 62 and the center axis X coincide with each other, and the rotation plate 62b is driven to rotate about the center axis X by the air motor 6.
As shown in FIG. 8, the rotary plate 62b is provided with a plurality of sliding holders 65 radially from the central axis X. In the present embodiment, four sliding holders 65 are equally provided in four directions in a point-symmetric manner.

  The slide holder 65 is a hollow rectangular tube, and a rod-shaped member 61 is inserted therein, and the rod-shaped member 61 is supported by the slide holder 65 so as to be movable in a radial direction within a predetermined range. The cleaning tool 5 is attached to the attachment portion 61a at the outer end in the radial direction of the rod-shaped member 61 by fixing means that can be easily replaced and attached, for example, by fastening. The coil-shaped spring 66 as an elastic member causes the rod-shaped member 61 to move radially. It is urged inward.

Therefore, when the air motor 6 is rotationally driven in the duct 2, the rotating plate 62 b rotates, and the rod-like member 61 inserted and supported in the sliding holder 65 overcomes the urging force of the coil spring 66 by centrifugal force. The cleaning tool 5 moves outward in the radial direction until it strikes the duct inner peripheral surface 2a.
In this state, the cleaning tool 5 rotates around the central axis X while rubbing the duct inner circumferential surface 2a in the circumferential direction, and cleaning such as removal of deposits on the inner surface of the duct 2 is performed. Still further, the endless track device 3 moves the axial direction of the duct 2 to perform cleaning along the axial direction of the duct.
Therefore, the inside of the duct 2 can be cleaned without entering the duct 2.
Note that a plurality of rod-like members 61 provided with the cleaning tool 5 are provided and point-symmetrically inserted and held in the plurality of sliding holders 65, respectively, so that a balance is achieved in rotation, and the occurrence of vibration is suppressed.

At this time, the cleaning tool 5 moves until it abuts against the duct inner peripheral surface 2a by centrifugal force, and performs cleaning in accordance with the diameter of the duct inner peripheral surface 2a, so that it corresponds to the movable range of the rod-shaped member 61. In the range (Dmax to Dmin) of the diameter of the duct inner peripheral surface 2a, the inner surface of the duct 2 having an arbitrary diameter can be cleaned without exchanging the cleaning tool 5 or the rod-shaped member 61.
Moreover, if it is in the range (Dmax-Dmin) of the diameter of the duct internal peripheral surface 2a, even if the diameter of the duct 2 changes in the middle, it will automatically follow and can be continuously cleaned.

  As described above, since the plurality of endless track devices 3 over the entire circumference are displaced by the same amount from the rotation center axis X of the rotating member 62 and are grounded to the duct inner peripheral surface 2a, the rotation center axis X of the rotating member 62 and The central axis of the duct 2 coincides.

Further, each endless track device 3 is displaced in the radial direction, and all the endless track devices 3 are matched with the diameter of the duct inner peripheral surface 2a within the above-mentioned diameter range (Dmax to Dmin) of the duct inner peripheral surface 2a. Can be grounded to the duct inner peripheral surface 2a and can support the cleaning apparatus 1 in the duct.
Even if the diameter of the duct inner peripheral surface 2a is different, the grounding of all the endless track devices 3 to the duct inner peripheral surface 2a can be maintained by controlling the pressure of the air cylinder 20 to be the same.

Therefore, in the rotation of the rotating member 62, that is, the rotation along the duct inner peripheral surface 2a of the cleaning tool 5, the cleaning tool 5 can be brought into contact with the duct inner peripheral surface 2a in an even state, and the cleaning tool 5 is provided. The rod-shaped member 61 is smoothly rotated, the generation of vibration is prevented, and cleaning is performed uniformly.
As shown in FIG. 8, the rotating plate 62b is provided with a vent hole 62c for ventilation for cleaning. Although not shown, the rear end plate 12 having a large diameter is also provided with appropriate ventilation holes.

When the cleaning is stopped or stopped and the rotation of the rotating member 62 is stopped (when not rotating), the rod-shaped member 61 moves in the direction of the rotation center axis X of the rotating member 62 by the biasing force of the coil spring 66. Therefore, the cleaning device 5 in the duct can be moved without the cleaning tool 5 being in contact with the inner peripheral surface 2a of the duct, and the in-duct cleaning device 1 can be easily carried in and out of the duct 2.
Further, since the rod-shaped member 61 and the cleaning tool 5 are pulled in even outside the duct 2, the duct cleaning device 1 is compact and easy to handle.

In the present embodiment, the air motor 6 is a one-way rotation type, but may be a two-way rotation switching type, and in this case, a cleaning operation suitable for the situation is facilitated.
In either case, the compressed air tube 7 for driving extends rearward from the air motor 6, and driving means related to the endless track device 3, that is, an air cylinder (extension / contraction driving means) 20 and a traveling air motor (traveling driving means) 40. 1, together with the compressed air tube 7 for driving, as described with reference to FIG. 1, if necessary, it is connected to a compressed air control / supply device 9 for driving via an appropriate compressed air tube feeding / retracting device 8.

Therefore, all the driving means of the in-duct cleaning apparatus 1 of the present embodiment uses the driving compressed air as a driving source and is remotely controlled by the driving compressed air. Therefore, the in-duct cleaning apparatus 1 has no ignition source. High explosion resistance. That is, it has explosion-proof properties when the gas handled in the duct 2 contains a flammable gas or dust removed by cleaning.
Moreover, the remote control of the in-duct cleaning device 1 can be easily performed by controlling the supply of the compressed air for driving.

  As the cleaning tool 5, an appropriate material and shape are selected according to the material of the duct 2, the handling gas, the adhered contaminants and the state thereof, and can be easily replaced and attached at the attachment portion 61 a of the rod-shaped member 61. For example, there are a nylon brush roll and a gold brush roll. An appropriate explosion-proof brush roll (for example, a commercially available AMPCO AMCWB-30C) can be used to further improve the explosion-proof property.

Although the cleaning tool 5 of this embodiment shown by FIG. 8 is roll shape (circular), you may attach not only that but the brush-shaped thing toward the duct internal peripheral surface 2a.
However, in the case of the roll-shaped embodiment of the present embodiment as shown in the figure, when a certain level of torque is applied to the roll-shaped cleaning tool 5, the cleaning tool 5 rotates relative to the rod-shaped member 61 at the attachment portion 61a. It is preferable that the cleaning tool 5 is fastened and attached with an appropriate tightening force, for example, via an elastic member so that the cleaning tool 5 is fixed without rotating with respect to the torque below that.
That is, the cleaning tool 5 is normally pressed against the duct inner peripheral surface 2a by centrifugal force, and cleaning is performed without rotation of the cleaning tool 5 itself by the rotation of the rod-shaped member 61. When there is a protrusion, a certain amount of torque is generated in the cleaning tool 5 by striking the protrusion, and the cleaning tool 5 rotates in the attachment portion 61a to get over the protrusion.
The duct inner peripheral surface 2a has seams (welded portions), bolt protrusions, and the like, but the cleaning tool 5 can be rotated with respect to a certain torque or more, so that the cleaning tool 5 is prevented from being damaged. .
Further, when the surface of the cleaning tool 5 is clogged with dust adhering to the inner peripheral surface 2a of the duct, the friction with the inner peripheral surface 2a of the duct increases and a torque exceeding a certain level is generated in the cleaning tool 5. As the cleaning tool 5 rotates at the attachment portion 61a, the cleaning can be continued with a clean roll surface.
Therefore, the frequency | count of cleaning tool 5 replacement | exchange by the clogging of the cleaning tool 5 is reduced significantly.

The duct inner surface cleaning apparatus of the present embodiment as described above has the following characteristics.
That is, in the in-duct cleaning device 1 for cleaning the inner surface of the duct 2 having a circular cross section, an air motor (rotation drive means) 6, a rotating member 62 attached to the air motor 6 and rotatable in the circumferential direction of the duct 2, and rotation A plurality of rod-shaped members 61 that are radially oriented and attached to the member 62 in a radially movable manner, a coil spring (elastic member) 66 that biases the rod-shaped member 61 radially inward, and the radius of the rod-shaped member 61 An endless track device 3 provided with a cleaning tool 5 provided at the outer end in the direction, a traveling air motor (traveling drive means) 40 provided with an adsorbing member in the ground contact portion 52a and capable of moving back and forth in the axial direction of the duct 2, It is comprised so that it may have.

Therefore, when the air motor 6 rotationally drives the rotating member 62, the plurality of rod-like members 61 attached to the rotating member 62 move outward in the radial direction by centrifugal force. Therefore, the rod-shaped member 61 rotates and the inner surface of the duct 2 is cleaned while the cleaning tool 5 provided at the radially outer end of the rod-shaped member 61 is in contact with the duct inner peripheral surface 2a.
Since a plurality of rod-like members 61 provided with the cleaning tool 5 are provided, it can be arranged so as to be balanced during rotation.
Since the rod-shaped member 61 is biased radially inward by the coil spring 66, when it is not in operation (non-rotating), it moves toward the center of the rotating member 62 so that the in-duct cleaning device 1 is in a compact state. This can facilitate the movement of the in-duct cleaning device 1.
On the other hand, since the rod-shaped member 61 can move by centrifugal force against the coil spring 66 until the cleaning tool 5 abuts against the inner circumferential surface 2a of the duct, the diameter of the duct 2 is not selected within a predetermined range, Cleaning can be performed corresponding to the ducts 2 of various diameters without exchanging the cleaning tool 5 or the rod-shaped member.

Moreover, since the in-duct cleaning device 1 includes the endless track device 3 including the traveling air motor 40, the inner surface of the duct 2 can be sequentially cleaned in the axial direction by moving in the axial direction of the duct 2. it can.
Therefore, the inside of the duct 2 can be cleaned without entering the duct 2.
Moreover, since the endless track device 3 is provided with the adsorbing member in the ground contact portion 52a, it can move in the axial direction in the vertical duct 2 'without slipping down. Not receive.
Moreover, since the diameter of the duct 2 is not selected within a predetermined range, it is easy to cope with the case where the diameter of the duct 2 changes as the in-duct cleaning device 1 moves.

Further, the endless track device 3 includes a plurality of air cylinders (extension / contraction drive means) 20 that are arranged in the circumferential direction of the duct 2 and that can expand and contract in the radial direction of the duct 2.
Therefore, the endless track device 3 can easily cope with the duct 2 having various sizes and a circular cross section whose diameter changes in the middle.

In addition, the air cylinder 20 is connected to the expansion / contraction link mechanism 38 of each endless track device 3 by the connecting plate 21 and is driven together. The expansion / contraction link mechanism 38 of each endless track device 3 has the same expansion / contraction displacement in the radial direction. Is configured to do.
For this reason, the air cylinder 20 and the connecting plate 21 simultaneously expand and contract the expansion / contraction link mechanisms 38 of the plurality of endless track devices 3 in the same amount in the radial direction, so that the rotational center X of the rotating member 62 of the in-duct cleaning device 1 is ducted. The rod-shaped member 61 provided with the cleaning tool 5 can be smoothly rotated, and the cleaning can be performed uniformly.

The attracting member of the ground contact portion 52a of the endless track device 3 is a permanent magnet.
Therefore, when the duct 2 is made of ordinary steel, the endless track device 3 can be reliably adsorbed to the duct 2 and can be easily applied to the duct 2 'in the vertical direction.

In addition, the air motor 6 and the traveling air motor 40 and the air cylinder 20 which are driving means according to the endless track device 3 are driven by compressed air for driving.
Therefore, it is highly explosion-proof against combustible gas and dust generated by dust removal, and remote control of the duct cleaning device 1 is facilitated by controlling the supply of driving compressed air.

  As mentioned above, although one Embodiment of the cleaning apparatus in a duct of this invention was described, this invention is not limited to the aspect of the said embodiment, What is implemented by the various aspects in the range of the summary of invention is carried out. Of course.

  DESCRIPTION OF SYMBOLS 1 ... Duct cleaning device, 2 ... Duct, 2 '... Duct, 2a ... Duct inner peripheral surface, 3 ... Endless track device, 5 ... Cleaning tool, 6 ... Air motor (rotation drive means), 7 ... Driven compressed air tube , 12 ... rear end plate, 13 ... front end plate, 14 ... main shaft, 20 ... air cylinder (extension drive means), 21 ... coupling plate (extension drive means), 35 ... main frame, 38 ... expansion / contraction link mechanism, 40 ... Traveling air motor (traveling drive means), 43 ... endless chain (endless track), 51 ... link, 51a ... laterally extending part, 52 ... grounding member, 52a ... grounding part (adsorption member), 61 ... rod-shaped member, 61a ... Mounting part, 62 ... Rotating member, 62a ... Rotating shaft, 62b ... Rotating plate, 65 ... Sliding holder, 66 ... Coil spring (elastic member)

Claims (5)

In the duct cleaning device for cleaning the inner surface of the duct having a circular cross section,
Rotation drive means;
A rotating member attached to the rotation driving means and rotatable in the circumferential direction of the duct;
A plurality of rod-shaped members attached to the rotating member in a radial direction and movably in the radial direction;
An elastic member for urging the rod-shaped member radially inward;
A cleaning tool provided at the radially outer end of the rod-shaped member;
An in-duct cleaning device comprising: an endless track device including a suction drive member provided in the grounding portion and capable of moving back and forth in the axial direction of the duct.   2. The in-duct cleaning device according to claim 1, wherein a plurality of the endless track devices are provided in the circumferential direction of the duct, and are provided with expansion / contraction driving means that can expand and contract in the radial direction of the duct.   The expansion / contraction drive means is configured such that the expansion / contraction link mechanisms of the endless track devices are connected to each other and driven together, and the expansion / contraction link mechanisms of the endless track devices are configured to have the same expansion / contraction displacement in the radial direction. The in-duct cleaning device according to claim 2.   The in-duct cleaning device according to any one of claims 1 to 3, wherein the attraction member is a permanent magnet.   The in-duct cleaning device according to any one of claims 1 to 4, wherein the rotation driving unit and the driving unit related to the endless track device are driven by compressed air for driving.

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