JPH05245456A - Pipe-line cleaning device - Google Patents

Abstract

PURPOSE:To make it possible to ride over a stepped part by providing a cylinder-driven shuttle slide cylinder on the outer periphery of an intake pipe, then installing a parallel link and further, a shuttle drive wheel on the cylinder- driven shuttle slide cylinder through a link respectively, and pressing each drive wheel against the inner surface of a pipe-line. CONSTITUTION:A front slide cylinder 27a is moved to the rear and a rear slide cylinder 27b is moved to the front using the first air cylinder 37. Consequently, front and rear parallel links 23, 24 are shrunk in a radial direction. Next, in this state, an intake pipe 14 is set in a pipe-line 10, and front and rear driven wheels 26a, 26b are allowed to come in contact with the inner surface of the tubular path 10 by reversing each part using the first air cylinder 37. When moving the intake pipe 14 through the pipe-line 10 to perform cleaning by suction, the first air cylinder 37 contracts through the front activation link 36a as the front drive wheel 26a climbs over a stepped part 10a. Thus only the front slide cylinder 27a moves backward and thereby the front parallel link 23 contracts to allow the front drive wheel 26a to fit into the pipe inner diameter d7 of the stepped part 10a. The same process takes place on the rear drive wheel 26b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a pipeline cleaning device for cleaning the interior of pipelines such as agricultural water and rainwater.

[0002]

2. Description of the Related Art Conventionally, as a pipe line cleaning device as described above, a suction pipe is arranged at the axial center (center) of the pipe line, and a wheel attached to the suction pipe is brought into contact with the inner surface of the pipe line. While running the suction pipe in the axial direction of the pipe with each wheel, the suction nozzle at the front end of the suction pipe is oscillated in the circumferential direction to suck and collect sludge accumulated on the lower inner surface of the pipe. There is something I did.

However, since the suction nozzle swings in the circumferential direction around the suction tube, unless the suction tube is accurately arranged at the axial center of the conduit, the suction nozzle is not positioned accurately. Since the tip of does not swing along the inner surface of the pipe,
There is a problem in that there is a suction remaining portion where sludge and the like are not sucked.

Therefore, the applicant of the present invention has disclosed in Japanese Patent Application No. 3-225694 that the suction pipe can be accurately arranged at the axial center position in the pipe line and has a different pipe diameter, although it has not been published yet. We have proposed a pipeline cleaning device that allows the suction tube to be accurately placed at the axial center position even by simply replacing parts on the road.

According to the above proposed pipeline cleaning device, FIG.
~ As shown in FIG. 14, the suction pipe 1 is provided in the pipe line 10 (A, F).
2 and slide the slide cylinder 22 to one side,
The parallel links 29, 30 expand outward in the radial direction via the first connecting member 31 and the second connecting member 32, and the front drive wheels 34a and the rear drive wheels 34b of the second connecting member 32 are connected to the conduit 10 (A). ,
It touches the inner surface of F) at equally divided positions on the circumference. Due to the tensioning action associated with the expansion of the parallel links 29, 30, the suction pipe 12 is accurately arranged at the axial center position C of the conduit 10 (A, F). As a result, the tip of the suction nozzle 13 always swings along the inner surface of the conduit 10 (A, F), so that a portion of the sludge 11 that remains unsucked is less likely to occur. If the parallel links 29, 30 are replaced with ones having different link lengths, the expansion stroke can be changed and the different pipe diameters d
It becomes possible to adapt to the pipeline 10 (A, F) of 1, d6.

[0006]

However, as shown in FIG.
As shown in FIG. 3, when the pipeline 10 becomes old and a step portion 10a is formed in the middle, in the pipeline cleaning device, the front drive wheels 34a and the rear drive wheels 34b are connected to each other by the parallel links 29 and 30. The front drive wheel 34a is reduced to the inner diameter d7 of the step portion 10a because only the same stroke is expanded and contracted at the same time.
Even if it is possible to pass over 0a, the rear drive wheel 3
4b is also reduced to the same diameter so that it is not stretched on the inner surface of the conduit 10 and the propulsive force of the rear drive wheel 34b is reduced, and in the end there is a problem that the front drive wheel 34a cannot get over the step portion 10a.

Therefore, an object of the present invention is to provide a pipe line cleaning device which can accurately dispose the suction pipe at the axial center position in the pipe line and can easily overcome even if the pipe line has a step portion. Especially.

[0008]

In order to achieve the above-mentioned object, the first aspect of the present invention is to provide a suction pipe arranged at the axial center position of a pipe line, and a circumference at a front portion and a rear portion of the suction pipe. At least three front parallel links and rear parallel links that are supported at substantially equal positions and are expandable and contractible in the radial direction, and supported by the front parallel links and the rear parallel links, respectively, and contact the inner surface of the conduit. Front drive wheel and rear drive wheel, a front slide cylinder and a rear slide cylinder axially slidably supported at intermediate portions of the suction pipe, a front parallel cylinder and a front parallel link, and a rear slide cylinder and a rear slide cylinder. It is characterized in that it is provided with a front actuation link and a rear actuation link respectively connecting the parallel links, and air cylinders provided on the front slide cylinder and the rear slide cylinder.

According to a second aspect of the present invention, a suction pipe disposed at an axial center position of the pipe line, an outer cylinder slidably supported by the suction pipe and having a suction nozzle at a front end portion thereof, and an outer cylinder At least three front parallel links and rear parallel links, which are supported at substantially equal positions on the circumference of the front and rear portions of the cylinder and are expandable and contractible in the radial direction, and supported by the front parallel links and rear parallel links, respectively. A front drive wheel and a rear drive wheel that come into contact with the inner surface of the pipe, a front slide tube and a rear slide tube that are slidably supported in the axial direction at an intermediate portion of the outer tube, and the front slide tube. A front parallel link, a front working link and a rear working link that respectively connect the rear slide cylinder and the rear parallel link, an air cylinder provided in the front slide cylinder and the rear slide cylinder, and the outer cylinder and the suction pipe. Ayr It is characterized by having a Sunda.

[0010]

According to the pipe line cleaning device of the first aspect of the present invention, when the suction pipe is inserted in the pipe line and the front and rear slide cylinders are slid by the air cylinder, the front and rear operation links are inserted. The front and rear parallel links expand outward in the radial direction, and the front drive wheel and the rear drive wheel come into contact with the inner surface of the conduit at equal circumferential positions. Due to the tensioning action that accompanies the expansion of the parallel links, the suction pipe is accurately arranged at the axial center position of the conduit.

When the front drive wheel hits the stepped portion of the pipeline, the front drive wheel rides on the stepped portion, and the air cylinder is contracted (the air in the air cylinder is compressed by the front operating link). Then, only the front drive wheel is reduced to the inner diameter of the step. At this time, since the rear drive wheels are still expanded, the propulsive force of the rear drive wheels causes the front drive wheels to move forward over the step. Immediately after this advance,
The front drive wheel expands, the air cylinder extends, and the forward drive wheel and the rear drive wheel propel the vehicle forward.

Next, when the rear drive wheel hits the step of the pipeline,
When this rear drive wheel rides on the step portion, the air cylinder is contracted (the air in the air cylinder is compressed) via the rear actuation link, and only the rear drive wheel is contracted to the inner diameter of the step portion. At this time, since the front drive wheels are still enlarged, the propulsive force of the front drive wheels causes the rear drive wheels to move forward over the step. Immediately after this forward movement, the rear drive wheels expand, the air cylinder extends, and the forward drive wheels and the rear drive wheels move forward with the propulsive force.

According to the second aspect of the present invention, when the suction pipe is inserted into the pipe together with the outer cylinder and the front and rear slide cylinders are slid by the air cylinder, the front and rear operation links are linked. The front and rear parallel links expand outward in the radial direction via, and the front drive wheel and the rear drive wheel come into contact with the inner surface of the pipe line at equal circumferential positions. Due to the tensioning action that accompanies the expansion of the parallel links, the suction pipe is accurately arranged at the axial center position of the conduit.

When the front drive wheel hits the step of the pipeline, the front drive wheel rides on the step, whereby the air cylinder is contracted through the front operating link (the air in the air cylinder is compressed). Then, only the front drive wheel is reduced to the inner diameter of the step. At this time, since the rear drive wheels are still expanded, the propulsive force of the rear drive wheels causes the front drive wheels to move forward over the step. Just before this advance,
By opening the other air cylinder to the atmosphere, the connection between the suction pipe and the outer cylinder will be released,
Since only the front and rear drive wheels and the outer cylinder are used, and the heavy objects of the suction pipe and the suction hose remain at their original positions, the load of the propulsive force by only the rear drive wheels is reduced. Immediately after this forward movement, the front drive wheels expand, the air cylinder extends, and the forward drive wheels and the rear drive wheels move forward by the propulsive force. At the same time, when the other air cylinders are reduced in size, the suction pipe and the like are pulled in the forward direction from the original position and are again connected to the outer cylinder.

Next, when the rear drive wheel hits the step of the pipeline,
When the rear drive wheel rides on the step portion, the air cylinder is contracted (the air in the air cylinder is compressed) via the rear actuation link, and only the rear drive wheel is contracted to the inner diameter of the step portion. At this time, since the front drive wheels are still enlarged, the propulsive force of the front drive wheels causes the rear drive wheels to move forward over the step. Immediately before this advance, opening the other air cylinder to the atmosphere releases the connection between the suction pipe and the outer cylinder, so only the front and rear drive wheels and the outer cylinder move forward. Heavy loads on the pipe and suction hose remain in their original position, reducing the load of propulsive force from the front drive wheels only. Immediately after this forward movement, the rear drive wheels expand,
The air cylinder extends and moves forward with the propulsive force of the front and rear drive wheels. At the same time, when the other air cylinders are reduced in size, the suction pipe and the like are pulled in the forward direction from the original position and are again connected to the outer cylinder.

[0016]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. 1 is a side view of the front half of the pipeline cleaning device, FIG. 2 is a side view of the rear half of the device, and FIGS.
Combine with L. Similarly, FIG. 3 is a plan view of the front half of the apparatus, and FIG. 4 is a plan view of the rear half of the apparatus.
Join at the cutting line CL.

As shown in FIGS. 1 to 4, a suction tube 14 which is long in the axial direction is arranged at the axial center position C of the conduit 10. A suction hose 15 is connected to the rear end of the suction pipe 14,
The suction hose 15 is connected to suction means of a suction wheel (not shown). An outer cylinder 16 is fitted in the suction pipe 14 so as to be slidable in the axial direction relative to the suction pipe 14, and a bellows-shaped suction nozzle 17 is provided at a front end portion of the outer cylinder 16.
Are connected.

The tip of the suction nozzle 17 and the front end of the outer cylinder 16 are connected by a cylinder 18 and a link 19, and the cylinder 18 and the link 19 cause the suction nozzle 17 to move to a retracted position (2 It is rocked up and down to a suction position (see a dotted line) and a suction position (see a solid line) which curves downward and extends along the inner surface of the conduit 10.

Motors 20 and 20 for swinging the suction nozzle 17 in the circumferential direction (left and right direction of the conduit 10) are provided at the front end of the suction pipe 14. Also, the outer cylinder 1
At the upper part of the front end of 6, C for monitoring the situation in the pipeline 10
A CD camera 21a and a light 21b are mounted.

On the other hand, on the outer circumference of the front part of the outer cylinder 16, front parallel links 23 composed of links 23a, 23b, and 23c are attached at three equal positions on the circumference, and on the outer circumference of the rear part of the outer cylinder 16, Rear parallel link 24 consisting of links 24a, 24b, 24c
Are mounted at three equal positions on the circumference. A bracket 25a is pivotally attached to the link 23b of each front parallel link 23 so as to be rotatable, and the front drive wheel 26a is attached to the bracket 25a.
Is installed. A bracket 25b is pivotally attached to the link 24b of each of the rear parallel links 24, and rear drive wheels 26b are attached to the bracket 25b.

A pair of turning cylinders 35a, 35b are attached to the links 23b, 24b, respectively. The turning cylinders 35a, 35b are mounted on the brackets 25a, 35b.
25b are respectively connected. The drive wheels 26a and 26b are moved by the turning cylinders 35a and 35b.
The front-rear traveling position to be directed in the axial direction of the pipeline 10 and the pipeline 1
90 ° to the left and right running positions to move in the direction perpendicular to the 0 axis
Turn in degrees. Although not specifically shown, each of the drive wheels 26a, 26b has a built-in motor,
The drive wheels 26a and 26b are rotationally driven by this motor.

A front slide cylinder 27a and a rear slide cylinder 27b are fitted on both sides of the intermediate portion of the outer cylinder 16 so as to be slidable in the axial direction. This front slide cylinder 27a
And the front parallel link 23 are connected by a front operating link 36a, and the rear slide cylinder 27b and the rear parallel link 24 are connected by a rear operating link 36b.

A front end portion 37a of the piston rod of the first air cylinder 37 is connected to the front slide cylinder 27a, and a rear end portion 37b of the cylinder body of the first air cylinder 37 is connected to the rear slide cylinder 27b. Has been done.
When the first air cylinder 37 is extended, the front slide cylinder 27a slides forward, and the rear slide cylinder 27b.
Slides rearward, the front and rear parallel links 23, 24 expand radially outward with the same stroke via the respective operating links 36a, 36b, and conversely, when the first air cylinder 37 is contracted, The slide cylinder 27a slides backward,
The rear slide cylinder 27b slides forward, and the front and rear parallel links 23, 24 are contracted radially inward by the same stroke via the respective operating links 36a, 36b.

A bracket 38 straddling the first air cylinder 37 is fixed to an intermediate portion of the outer cylinder 16, and a rear end portion 39b of a cylinder body of a second air cylinder 39 is connected to the bracket 38, A front end 39a of the piston rod of the second air cylinder 39 is connected to the rear end of the suction pipe 14. This second air cylinder 3
The reference numeral 9 connects the suction pipe 14 and the outer cylinder 16 to the state shown in FIGS. 1 and 2 when the air is supplied and contracts, but when the second air cylinder 39 is opened to the atmosphere, The connection between 14 and the outer cylinder 16 is released. As a result, the suction pipe 14 and the outer cylinder 16 can relatively slide with each other at a predetermined stroke L.

According to the above configuration, the first air cylinder 3
7, the front slide cylinder 27a is slid backward, the rear slide cylinder 27b is slid forward, and the front and rear parallel links 23 and 24 are contracted inward in the radial direction. Set it at the entrance.

Then, the front slide cylinder 27a is slid forward by the first air cylinder 37, and the rear slide cylinder 27b is moved.
Slide backwards to connect front and rear parallel links 23, 24
Is expanded radially outward with the same stroke, the front and rear drive wheels 26a, 26b come into contact with the inner surface of the pipe line 10 at trisection positions on the circumference (see FIGS. 5 and 6). Due to the tensioning action associated with the expansion of the parallel links 23, 24, the suction pipe 14 is accurately arranged at the axial center position C of the conduit 10.

Next, the suction nozzle 17 is attached to the cylinder 18 and the link 1 at the suction position calculated from the inner diameter of the conduit 10.
When it is swung downward at 9, the suction pipe 14 is arranged at the axial center position C, and therefore the tip of the suction nozzle 17 always swings left and right along the inner surface of the pipe line 10. Is less likely to occur.

On the other hand, as shown in FIG. 7, the front drive wheel 26a hits the step portion 10a of the pipe line 10 during the cleaning work of the pipe line 10, and as shown in FIG. 1
By riding on 0a, the first air cylinder 37 is contracted (the air in the first air cylinder 37 is compressed) via the front operation link 36a, and only the front slide cylinder 27a slides rearward, and the front parallel Link 23
Is reduced, and as shown in FIG. 8, only the front drive wheel 26a is reduced to the inner diameter d7 of the step portion 10a. At this time, the rear drive wheels 2
Since 6b is still enlarged, the propulsive force of the rear drive wheel 26b causes the front drive wheel 26a to move forward over the step portion 10a.

Immediately before this advance, the second air cylinder 3
By opening 9 to the atmosphere, the suction pipe 14 and the outer cylinder 16
Since the connection with is released, only the front and rear drive wheels 26a, 26b and the outer cylinder 16 can move forward, and since the heavy objects of the suction pipe 14 and the suction hose 15 remain in their original positions, the rear drive The load of propulsive force due to only the wheel 26b is reduced.

Immediately after this forward movement, as shown in FIG. 9, the front drive wheel 26a expands again, the first air cylinder 37 extends, and the forward drive wheel 26a and the rear drive wheel 26b move forward by the propulsive force. become. At the same time, when the second air cylinder 39 is contracted, as shown in FIG. 10, the suction pipe 14 and the like are pulled from the original position in the forward direction and are connected to the outer cylinder 16 again.

Next, the rear drive wheel 26b is connected to the step portion 1 of the pipeline 10.
When the rear drive wheel 26b hits the step portion 10a upon hitting 0a, the first air cylinder 37 is contracted (the air in the air cylinder 37 is compressed) via the rear operation link 36b, and only the rear slide cylinder 27b. By sliding forward, the rear parallel link 24 is reduced and the rear drive wheel 2
Only 6b is reduced to the inner diameter d7 of the step 10a. At this time, since the front drive wheel 26a is still expanded, the rear drive wheel 26b moves over the step 10a by the propulsive force of the front drive wheel 26a.

Immediately before this advance, the second air cylinder 3
When 9 is opened to the atmosphere, the connection between the suction pipe 14 and the outer cylinder 16 is released, and therefore the forward drive wheel 26a, the rear drive wheel 26a,
26b and the outer cylinder 16 only, and the heavy objects of the suction pipe 14 and the suction hose 15 remain in their original positions, so that the load of the propulsive force by only the front drive wheel 26a is reduced.

Immediately after this forward movement, the rear drive wheel 26b expands, the first air cylinder 37 extends, and the front drive wheel 26b expands.
A and the rear drive wheels 26b propel the vehicle forward. At the same time, when the second air cylinder 39 is contracted, the suction pipe 14 and the like are pulled from the original position in the forward direction, and the outer cylinder 1 again.
6 is connected.

As described above, even if the conduit 10 has the step portion 10a, the front and rear drive wheels 26a and 26b can be easily overcome.

On the other hand, the suction pipe 14 is set at the inlet of the pipe line 10, and the front and rear parallel links 23, 24 are expanded outward in the radial direction by the same stroke, so that the drive wheels 26a, 26b are extended.
When the drive wheels 26a, 26b are in the front-rear traveling position in the process of contacting the inner surface of the pipe 10 with the trisection position on the circumference, the drive wheels 26a, 26b, which are located below, slide sideways while slipping. It will be in a state of climbing the inner surface of. The sideslip acts as a resistance, the expansion of the parallel links 23 and 24 is not smooth, and if the sideslip resistance is different, the suction tube 14 may tilt (turn). This suction tube 1
When 4 is tilted, the suction nozzle 17 cannot sufficiently suck and collect sludge and the like, so that a suction remaining portion occurs.

Therefore, after the suction pipe 14 is set at the inlet of the conduit 10, the drive wheels 26a and 26b are turned to the left and right traveling positions by the turning cylinders 35a and 35b. After that, each slide cylinder 27a,
When 27b is slid and the front and rear parallel links 23 and 24 are expanded outward in the radial direction by the same stroke, the drive wheels 26a and 26b, which are located below, move in the left and right directions,
Climb the inner surface of the pipe, and come into contact with the inner surface of the pipe line 10 at three equal positions on the circumference. Due to the tensioning action associated with the expansion of the parallel links 23, 24, the suction pipe 14 is accurately arranged at the axial center position C of the conduit 10. After that, the first air cylinder 37 turns the drive wheels 26a and 26b to the forward and backward traveling positions.

As described above, when the drive wheels 26a and 26b are turned while the suction tube 14 is set in the conduit 10 (or unset), the drive wheels 26a and 26b do not slide sideways.
The expansion (or contraction) of each parallel link 23, 24 is smooth. Further, since the drive wheels 26a, 26b run without skidding, a difference in running resistance between the drive wheels 26a, 26b is unlikely to occur, so that the suction tube 14 is less likely to tilt (turn).

In addition, the suction tube 1 for some reason during the cleanup
In the case where 4 is tilted, in the past, an operator had to enter the pipe 10 and return it to the original position. In the present embodiment, however, the drive wheels 26a and 26b are moved to the left and right traveling positions by the turning cylinders 35a and 35b. Drive wheel 26a, in the opposite direction to the tilted direction.
By driving 26b, the inclination of the suction tube 14 can be corrected. The drive wheels 26a, 26 at the left and right traveling positions
b can rotate 360 degrees, and if there is a protrusion in the conduit 10, for example, to avoid it, the drive wheels 26a, 2
6b can be turned.

In the above embodiment, the outer cylinder 16 to which the suction nozzle 17 is connected is fitted into the suction pipe 14, and the outer cylinder 1
Although the slide cylinders 27a, 27b, the parallel links 23, 24, etc. are attached to the slide cylinder 6, the outer cylinder 16 and the second air cylinder 39 are omitted, and the slide cylinders 27a, 2 are attached to the suction pipe 14.
7b or parallel links 23, 24 may be attached. Further, the first air cylinder 37 is attached to the front slide cylinder 2
7a and the rear slide cylinder 27b are connected, but each slide cylinder 27a, 27b may be provided with an independent air cylinder.

[0040]

As is apparent from the above description, in the duct cleaning device according to claim 1 of the present invention, when the drive wheel hits the step portion of the pipe, the drive wheel rides on the step portion.
The first air cylinder is contracted (the air in the first air cylinder is compressed) via the operation link, and only the front or rear drive wheel is contracted to the inner diameter of the step portion, and the rear or front drive wheel is expanded. It is the one that is left as it is.
Therefore, it is possible to easily get over the front and rear drive wheels even if there is a step in the pipe line.

Further, in the pipeline cleaning device according to the second aspect of the present invention, when the drive wheel hits the step portion of the pipeline, the drive wheel rides on the step portion so that the first air cylinder is actuated via the operation link. The air is reduced in size (the air in the first air cylinder is compressed) so that only the front or rear drive wheel is reduced to the inner diameter of the step portion, and the second air cylinder is opened to the atmosphere. Therefore, since the connection between the suction pipe and the outer cylinder is released by the second air cylinder, only the front and rear drive wheels and the outer cylinder move forward, and the heavy objects such as the suction pipe and the suction hose are the original. Since it remains in the position, it is possible to reduce the load of propulsive force due to only the front or rear drive wheels.

[Brief description of drawings]

FIG. 1 is a side view of a front half of a cleaning device of the present invention.

2 is a side view of the rear half of the device of FIG.

FIG. 3 is a plan view of the front half of the device of FIG.

4 is a plan view of the rear half of the apparatus of FIG.

5 is a sectional view taken along the line AA of FIG.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is a schematic side view of a front drive wheel in a stepped contact state.

FIG. 8 is a schematic side view of the front drive wheel in a contracted state.

FIG. 9 is a schematic side view of the front drive wheel in an enlarged state.

FIG. 10 is a schematic side view of the suction tube in a drawn state.

FIG. 11 is a schematic side view of a prior art front drive wheel in a stepped contact state.

FIG. 12 is a perspective view of a prior art cleaning device.

FIG. 13 is a cross-sectional view of a pipe having a small inner diameter.

FIG. 14 is a cross-sectional view of a large inner diameter pipe line.

[Explanation of symbols]

10 ... Pipeline, 10a ... Step, 14 ... Suction tube, 15 ... Suction hose, 16 ... Outer cylinder, 17 ... Suction nozzle, 23 ... Front parallel link, 24 ... Rear parallel link, 26a ... Front drive wheel, 26b
... rear drive wheels, 27a ... front slide cylinder, 27b ... rear slide cylinders, 36a, 36b ... operating links, 37 ... first air cylinder, 39 ... second air cylinder.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ogura ▲ Hiro ▼ Line 6-45 Koshienguchi, Nishinomiya-shi, Hyogo Within Far East Development Co., Ltd.

Claims (2)

[Claims] 1. A suction pipe arranged at an axial center position of a pipe line, and at least three suction pipes which are supported in front and rear portions of the suction pipe at circumferentially substantially equal positions and are expandable and contractible in a radial direction. Front parallel link and rear parallel link, front drive wheel and rear drive wheel supported by the front parallel link and the rear parallel link, respectively, which come into contact with the inner surface of the conduit, and the axial direction at the intermediate portion of the suction pipe. A front slide cylinder and a rear slide cylinder slidably supported to the front slide cylinder, a front parallel link, a front parallel link, and a front slide link and a rear parallel link connecting the rear slide cylinder and the rear parallel link, respectively, and the front slide cylinder. A conduit cleaning device comprising: an air cylinder provided on a rear slide cylinder. 2. A suction pipe arranged at an axial center position of a pipe line, an outer cylinder slidably supported by the suction pipe in an axial direction and having a suction nozzle at a front end portion, and a front portion of the outer cylinder. At least three front parallel links and rear parallel links, which are respectively supported in the rear portion at substantially equal positions on the circumference and are expandable and contractible in the radial direction, and supported by the front parallel links and the rear parallel links, respectively, Front drive wheel and rear drive wheel that come into contact with the inner surface of the front slide cylinder, a front slide cylinder and a rear slide cylinder that are axially slidably supported at the intermediate portion of the outer cylinder, and the front slide cylinder, the front parallel link, and the rear parallel cylinder. A front operating link and a rear operating link connecting the slide cylinder and the rear parallel link respectively, an air cylinder provided in the front slide cylinder and the rear slide cylinder, and an air cylinder connecting the outer cylinder and the suction pipe. Pipe cleaning device, characterized in that.