JP2714428B2 - Cylindrical inner surface cleaning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cylindrical inner surface cleaning apparatus for removing harmful foreign substances such as oxide scale adhered and formed on a cylindrical inner surface by using water pressure. .

[Related Art] On the inner surface of a shaft that is exposed to a high temperature for a long time, such as a steam turbine shaft of a power plant, the surface of the member is oxidized to form an oxide scale. At the time of periodic inspection, it is necessary to remove this oxide scale and expose the background to check for defects.

Conventionally, in order to remove such oxide scale, a roller whetstone is rotated and inserted into the inner surface of the cylinder of the shaft to perform the cleaning operation.However, it takes an enormous amount of work time per shaft. I have. For example, when removing the oxide scale on the inner surface of a shaft having a diameter of 120 mm and a length of 6000 mm, it takes 140 to 200 hours for each one.

In addition, such a problem is not limited to the steam turbine shaft of the power plant, but similarly exists in various cylinders in which harmful foreign substances are easily attached and formed on the inner surface.

[Problems to be Solved by the Invention] The present invention has been proposed to solve the above-mentioned problems of the prior art, and its object is to remove foreign substances on the inner surface of a cylinder reliably in a short working time. An object of the present invention is to provide an excellent cylindrical inner surface cleaning device that can be used.

[Means for Solving the Problems] The present invention focuses on removing foreign matters on the inner surface of a circular pipe such as a heat exchanger by using high-pressure jet water. The inner surface of the cylinder is polished by the injection and the outflow of the slurry containing the abrasive.

That is, the present invention is directed to a polishing head that is inserted into a cylinder, injects high-pressure water, and at the same time, discharges a slurry containing a polishing material to polish the inner surface of the cylinder, and a high-pressure water generating unit that generates high-pressure water And a high-pressure water supply means for supplying the generated high-pressure water to the cleaning head, a recovery tank for recovering excess water including the cleaning material in the cylinder, and stirring the water including the cleaning material in the recovery tank. A stirrer for suspending the abrasive and forming a slurry;
A slurry supply means for supplying the formed slurry to the polishing head, a first drive mechanism for linearly moving the polishing head in the axial direction, and a second driving mechanism for rotating the polishing head to both sides about its axis. And a third drive mechanism for rotating the cylinder to both sides about its axis.
And the cleaning head is disposed in parallel at a fixed interval and two disks of the same diameter supported integrally, and sealing means for sealing between the outer periphery of each disk and the inner surface of the cylinder, An opening for excess water overflow provided in at least one of the disks, and a high-pressure water injection means and a slurry outflow means supported by one of the disks and arranged so that the opening end is located between the two disks And characterized in that:

[Operation] The operation of the present invention having the above-described configuration is as follows.

That is, when the cleaning head is inserted into the cylinder, the two disks and the sealing means constitute a cleaning space sandwiched between the two disks in the cylinder. In this state, when the high-pressure water is injected and the slurry containing the cleaning material flows out, the mixed water of the high-pressure water and the slurry collected in the cleaning space becomes a stirring jet, and the high water pressure and the cleaning material are removed. By the action, the inner surface of the cylinder can be efficiently cleaned in a short time.

Then, the first to third driving mechanisms can move the polishing head in the axial direction, rotate the polishing head around the axis, and rotate the cylinder. By performing the cleaning operation described above, the entire inner surface of the target cylinder can be cleaned.

In addition, since the surplus water of this cleaning operation overflows from the opening provided in the disk and is collected in the collection tank, the water in the collection tank is stirred by a stirrer to form a slurry, By supplying the formed slurry to the cleaning head, the cleaning operation can be performed repeatedly. Therefore, the abrasive can be used without waste.

Further, if the polishing head or the cylinder is reciprocated in small increments by the second and third driving mechanisms,
A more effective stirring jet can be formed, and the efficiency of the cleaning operation can be improved.

[Embodiment] An embodiment of a cylindrical inner surface cleaning apparatus according to the present invention will be specifically described below with reference to Figs. 1 to 3. Here, FIG. 1 is a perspective view showing the whole, FIG. 2 is a sectional view in the axial direction showing a cleaning operation state, and FIG. 3 is a sectional view in the same direction perpendicular to the shaft.

In FIG. 1, 1 is a cylinder, and 2 is a cleaning head.
The cleaning head 2 is composed of two disks 3, 4 on the supply side and the overflow side, which are arranged in parallel at a fixed interval, and each disk.
A sealing elastic body 5 for sealing between the outer circumferences of the cylinders 3 and 4 and the inner surface of the cylinder 1, an opening 4a for excess water overflow provided in the disk 4 on the overflow side, and the disks 3 and 4 are integrally connected. Support member 6, a high-pressure water injection nozzle unit 7 inserted in the middle of the support member 6, and a slurry outlet having a slurry outlet 8 a disposed in parallel with the support member 6 and near the high-pressure water injection nozzle unit 7. And a tube 8. Here, as shown in FIG. 2, one of the overflow openings 4a holds a sufficient amount of water in the cleaning space, and the injection nozzle 9 of the high-pressure water injection nozzle unit 7 The height is set to be higher by a predetermined dimension H.

The injection nozzle 9 is, as shown in FIGS. 2 and 3,
A plurality of high pressure water is supplied from a water pressure pump 11 outside the cleaning head 2 via a high pressure water pipe 10. Here, the high-pressure water pipe 10 penetrates the disk 3 on the supply side and is inserted and arranged in the support member 6. The slurry outflow pipe 8 is supported by the disk 3 on the supply side so as to penetrate therethrough.
, A slurry of the abrasive material is supplied.

Further, water receivers 13 are disposed at the opening ends on both sides of the cylinder 1, and all the excess water in the cylinder 1 is recovered to the recovery tank 14 via the water receiver 13. A stirrer 15 is disposed in the recovery tank 14, and the collected surplus water, that is, the water containing the abrasive is stirred to float the abrasive and form a slurry. The formed slurry is supplied again into the cylinder 1 by the above-mentioned slurry pump 12. Further, a concentration sensor 16 is provided in the middle of the slurry outflow pipe 8, and a control means (not shown) is operated by a signal from the concentration sensor 16, and a polishing material hopper 17 provided in the collection tank 14 is provided.
And a suitable concentration of abrasive material is supplied to maintain a constant concentration.

By the way, as described above, since the slurry is configured to circulate between the cylinder 1 and the collection tank 14,
When all the surplus water in the cylinder 1 is collected in the collection tank 14, the high-pressure water jetted from the high-pressure water jet nozzle unit 7 in the collection tank 14 becomes the surplus water. In the present embodiment, the surplus water is pumped out by the drainage pump 19 via the filter 18 and discharged as clean water. Further, a backwash valve 20 is provided between the filter 18 and the drainage pump 19, and sends pressure air to the filter 18,
The element is appropriately cleaned to prevent the filter 18 from being clogged.

Further, in this embodiment, first and second driving mechanisms for driving the cleaning head 2 and a third driving mechanism for driving the cylinder 1 are provided. That is, in the cleaning head 2,
A driving rod 24 is provided extending from the center of the disk 3 on the supply side in the external axial direction.
Via the driving force 24, the first driving mechanism 21 can be linearly moved in the axial direction by the driving force, and the driving force of the second driving mechanism 22 can reciprocate within a certain range. . In this case, the polishing head 2 is provided with a guide rod 25 extending from the center of the disk 4 on the overflow side symmetrically to the drive rod 24, and these rods 24, 25 are provided near the polishing head 2. , Cleaning head 2 in cylinder 1
And guide rollers 26 for guiding the same. The cylinder 1 is supported on a third drive mechanism 23,
The operation of the drive mechanism 23 allows the drive mechanism 23 to turn to both sides.

The operation of the present embodiment having the above configuration is as follows.

First, the cylinder 1 is supported at a predetermined position above the third driving mechanism 23, and in this state, the driving force of the first driving mechanism 21
The cleaning head 2 is inserted into the cylinder 1. Then, the two disks 3 and 4 of the cleaning head 2 and the seal elastic body 5 form a cleaning space sandwiched between the two disks 3 and 4 in the cylinder 1. In this state, the hydraulic pump 11 is operated to inject high-pressure water from the injection nozzle 9 of the high-pressure water injection nozzle unit 7 through the high-pressure water pipe 10, and at the same time, simultaneously drive the slurry pump 12
Is operated, and the slurry flows out from the slurry outlet 8a through the slurry outlet pipe 8. Then, the mixed water of the high-pressure water and the slurry collected in the cleaning space becomes a stirring jet,
Due to the high water pressure and the action of the abrasive material contained in the slurry,
The inner surface of the cylinder 1 can be efficiently cleaned in a short time. The cleaning range in this case corresponds to a range where high-pressure jet water jetted from the jet nozzle 9 contacts as shown in FIG.

Then, the first to third driving mechanisms 21 to 23 can move the polishing head 2 in the axial direction, rotate about the axis, and rotate the cylinder 1. By performing the above-mentioned cleaning work while shifting
The entire inner surface of the target cylinder 1 can be efficiently cleaned in a short time.

Specifically, when removing the oxide scale on the inner surface of the shaft having a diameter of 120 mm and a length of 6000 mm, the operation time of 140 to 200 hours in the prior art was required for each of the shafts. Has confirmed that the cleaning operation can be performed in about 14 hours, which is about 14 hours.

In addition, since the surplus water of the cleaning operation overflows through the opening 4a provided in the disk 4 and is collected in the collection tank 14, the water in the collection tank 14 is stirred by the stirrer 15 to obtain slurry. Is formed, and the formed slurry is used as a polishing head 2
, The cleaning operation can be repeated. In this case, since not all of the slurry supplied to the polishing head 2 can be recovered, the concentration of the polishing material gradually decreases as the cleaning operation is repeated. The concentration of the slurry is detected by a concentration sensor 16 provided on the way, and when the concentration of the polishing material falls below a predetermined level, the polishing is controlled by a polishing material hopper 17 provided in the recovery tank 14. Since the material can be appropriately replenished, a constant concentration can be maintained.

Furthermore, by performing the polishing operation while the polishing head 2 is reciprocated in small increments by the second drive mechanism 22, a more effective stirring jet can be formed, and the efficiency of the cleaning operation can be improved.

Note that the present invention is not limited to the above embodiment, and the number of the injection nozzles 9 of the high-pressure water injection nozzle unit 7 can be appropriately selected, and the specific configuration of the first to third drive mechanisms and the like. Can also be selected as appropriate. Further, in the above embodiment, the excess water in the recovery tank 14 is filtered by the filter 18.
Through the drain pump 19 and discharge it as clean water. However, if the clean water is re-supplied to the hydraulic pump 11, a water saving effect can be obtained.

In addition, the present invention is suitable for removing oxide scale in a steam turbine shaft of a power plant, but is not limited thereto.
The present invention can be similarly applied to various types of cylinders on which harmful foreign substances are likely to adhere and form on the inner surface, and similarly excellent effects can be obtained.

[Effects of the Invention] As described above, in the cylindrical inner surface cleaning apparatus of the present invention, a cleaning space is formed by the disk of the cleaning head and the sealing means, and high-pressure water is injected into the cleaning space and By flowing out the slurry containing the abrasive material, the high water pressure and the abrasive material can act synergistically, so that foreign materials on the inner surface of the cylinder can be reliably removed in a significantly shorter working time than before. Effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a cylindrical inner surface cleaning apparatus according to the present invention, FIG. 2 is an axial sectional view showing a cleaning operation state by the apparatus, and FIG. It is sectional drawing. 1 ... Cylinder, 2 ... Sweeping head, 3,4 ... Disc, 4a ...
Opening, 5 ... Seal elastic body, 6 ... Support member, 7 ...
High pressure water injection nozzle unit, 8 ... Slurry outflow pipe, 8a
... Slurry outlet, 9 ... Injection nozzle, 10 ... Pipe for high pressure water, 11 ... Hydraulic pump, 12 ... Slurry pump, 13
…… Water receiver, 14 …… Recovery tank, 15 …… Agitator, 16 ……
Concentration sensor, 17: Abrasive hopper, 18: Filter, 19
... drain pump, 20 ... check valve, 21 ... first drive mechanism, 22 ... second drive mechanism, 23 ... third drive mechanism, 24
… Driving rod, 25… Guide rod, 26 …… Guide roller.

Claims (1)

(57) [Claims] 1. A cleaning head inserted into a cylinder to spray high-pressure water and at the same time to discharge slurry containing a cleaning material to clean the inner surface of the cylinder, and high-pressure water generating means for generating high-pressure water. A high-pressure water supply means for supplying the generated high-pressure water to the cleaning head, a recovery tank for recovering surplus water containing the cleaning material in the cylinder, and stirring the water containing the cleaning material in the recovery tank. A stirrer for suspending the cleaning material to form a slurry; a slurry supply means for supplying the formed slurry to the polishing head; a first drive mechanism for linearly moving the polishing head in the axial direction; A second drive mechanism for rotating the cylinder on both sides about the axis thereof, and a third drive mechanism for rotating the cylinder on both sides about the axis center. 2 which are arranged in parallel and are integrally supported Disks having the same diameter, sealing means for sealing between the outer periphery of each disk and the inner surface of the cylinder, an opening for excess water overflow provided in at least one disk, and an opening supported by one disk and its opening A cylindrical inner surface cleaning device having high-pressure water injection means and slurry outflow means arranged so that an end is located between two disks.