JP2010046737A - Rust removal treatment device in steel pipe of steel pipe structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suspension type rust removal treatment device capable of being operated by a general-purpose power supply source and performing not only a rust removal treatment from an upper side toward a lower side but also a rust removal treatment from the lower side toward the upper side. <P>SOLUTION: This rust removal treatment device includes a generally thin and long body 1, a rust removal part 2 arranged on a lower side at a lower end of a suspending direction of the body 1 and at least a support part 3 arranged in the body 1 and having a support arm 30 which can be opened to hold the body 1 at a hollow position in a steel pipe P. The rust removal part 2 is constituted of an openable/closable grinding arm 20 provided with a grinding device 23 at the distal end, and an arm driving device 22 for opening/closing the grinding arm 20 in a radiating direction from the body 1. The body 1 includes a rotary driving device 10 to rotate the rust removal part 2 by making a center shaft of the body 1 as a rotary shaft. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rust removal treatment apparatus for removing rust and the like generated on the inner surface of a steel pipe structure such as a steel pipe tower, and in particular, suspended and moved inside the steel pipe to remove the generated rust and the like. The present invention relates to a rust removal treatment apparatus for removing the rust. In the description of the present invention, the terms “upper” and “lower” are used in a positional relationship in a state in which a derusting apparatus is suspended inside an installed steel pipe, and the term “tip” It means the lower end in a state where the rust removal treatment device is suspended inside the steel pipe.

  Steel pipe structures such as steel pipe towers have the potential to generate rust on the inner surface due to the intrusion of moisture such as rainwater over time. This is one of the major factors that reduce the durability of objects.

  As a means for removing the rust generated inside the steel pipe, the present applicant suspends and moves the rust removal device inside the steel pipe, puts a sealing cup on the rust occurrence place, and puts the inside into a vacuum state. After that, an apparatus for removing rust by generating a vacuum arc discharge with the rust in the sealing cup by supplying a high voltage to the electrode provided in the sealing cup was proposed (Patent Document 1). reference). While this device has the advantage of removing rust by sublimation, it has the advantage of not producing residue during rust removal, but requires a large power supply source and vacuum pump for vacuum arc discharge. It is not necessarily suitable for use in a transmission tower.

Also, the rust generated near the joint of the steel pipe, in particular, the lower surface of the part projecting inward of the steel pipe at the joint and the inner surface part adjacent to the lower surface of the steel pipe needs to be derusted from below to above. However, in the case of a type of rust removal processing apparatus that is moved by suspending the inside of a steel pipe, it is a fact that no apparatus that can cope with processing in such a direction has been proposed.
JP 2004-11013 A

  The present invention does not require a vacuum pump or a large power supply source necessary for the derusting process using the above-described vacuum arc discharge. It is an object of the present invention to provide a hanging type rust removal treatment apparatus that can also carry out a rust removal treatment toward the surface.

  The rust removal treatment apparatus according to the present invention is a rust removal treatment apparatus for removing rust and the like generated on the inner surface of a steel pipe by suspending and moving inside the steel pipe of a steel pipe structure. The derusting apparatus is generally elongated, a derusting portion disposed below the lower end of the main body in the hanging direction, and disposed in the main body, and the main body is held in a hollow position in the steel pipe. And at least one pair of support portions having support arms that can be opened as much as possible. The derusting part includes a grinding arm having a grinding device at a distal end and freely opening and closing legs, and an arm driving device for causing the grinding arm to open and close in the radial direction from the main body with the base end of the grinding arm as a fulcrum. It is the composition provided with. The main body is provided with a rotation driving device for rotating the derusting portion with the central axis of the main body as a rotation axis.

  When the present rust removal treatment apparatus is suspended from the top of the steel pipe to the inside of the steel pipe and lowered to the rust position to be removed, the main body is held at the hollow position of the steel pipe by the legs of the support arm. Then, the arm driving device is operated to open the grinding arm, and the grinding device is operated by being brought into contact with the inner surface of the steel pipe having rust to be removed, thereby performing the rust removal treatment. The rotary drive device can rotate the grinding arm in the circumferential direction of the inner surface of the steel pipe to move the grinding device to the required rust position, and also rotate the grinding arm by the required angle even during the rust removal process. It is possible to continuously perform rust removal work at different positions in the circumferential direction on the inner surface of the steel pipe. When the derusting process is completed, the support arm is closed, the grinding arm is closed, the derusting apparatus is raised, and the steel pipe is extracted.

  A rust removing apparatus according to the present invention includes a motor, a bolt attached to the output rotation shaft of the motor, a nut that is screwed to the bolt and moved linearly in the direction of the central axis of the bolt, An arm driving device is provided that includes a coupled rack and a pinion that meshes with each of the racks and is provided at the base end of the grinding arm, and elastically pushes the rack in a direction in which the grinding arm opens. A spring member can be provided between the nut and the rack. The spring member allows the rack to move in the closed leg direction when the grinding arm of the grinding arm is pressed against the inner surface of the steel pipe and then the leg of the grinding arm is further opened. And elastically presses against the change of the distance from the center of rotation of the grinding arm to the inner surface of the steel pipe.

  The rust removal treatment device according to the present invention is also provided with a grinding device at the distal end portion of the rotating arm disposed on the distal end side of the grinding arm, and the rotating arm has a proximal end portion at the distal end portion of the grinding arm. In addition to being rotatably connected to an axis parallel to the rotation axis in the opening and closing leg movement, the arm turning device is driven to rotate relative to the grinding arm. You may make it the structure by which the grinding head was provided so that it might protrude.

  Further, the rust removal processing apparatus of the present invention includes a video camera for photographing the lower part of the rust removal treatment apparatus and photographing the rust removal work of the grinding apparatus, and an illumination device for irradiating the photographing direction of the video camera May be provided on the grinding arm.

  Furthermore, the rust removing apparatus of the present invention includes a video camera for photographing the rust removing operation of the grinding apparatus while photographing the lower part of the rust removing apparatus, and an illumination device for irradiating the photographing direction of the video camera. May be provided on the rotary arm.

  According to the present invention, the grinding device of the grinding arm can be pressed against the inner surface of the steel pipe by opening the grinding arm while the main body is supported at the hollow position in the steel pipe by the support arm. For this reason, the operation of the grinding device can reliably perform the rust removal work on the inner surface of the steel pipe. Further, by rotating the grinding arm along the circumferential direction of the steel pipe inner surface by the rotation drive device, it is possible to continuously remove rust generated at different positions in the circumferential direction on the steel pipe inner surface. Moreover, by providing a spring member between the nut and the rack, the grinding device can always be pressed against the inner surface of the steel pipe during the grinding operation with an elastic force. In addition, even if there is a gap between the central axis of the rotational movement by the rotary drive device and the central axis of the inner surface of the steel pipe, the deviation can be absorbed, so that the derusting operation can be performed reliably and continuously. . Furthermore, if the steel pipe has an inner diameter substantially equal to the entire length of the rotary arm including the grinding device by moving the opening leg of the grinding arm and the rotation of the rotary arm in an appropriate combination, the inside of the steel pipe Since the direction of the grinding device can be reversed in the case, without removing the rust removal processing device from the steel pipe, it occurs on the lower surface of the part protruding inward of the steel pipe at the joint and the inner surface part adjacent to the lower surface of the steel pipe, etc. Rust that has been removed can also be removed. Further, when the rust removal processing device is suspended and lowered in the steel pipe or during rust removal work, it can be photographed with a video camera while illuminating the lower part of the rust removal treatment device or the direction of the rust removal work with a lighting device. The photographed image is displayed on, for example, a display of a control device installed outside the steel pipe, so that the operator can move the rust removal processing device and open / close the grinding arm while viewing the image displayed on the display. It is possible to rotate the legs and the rotating arm, operate and stop the grinding apparatus, and the like.

  An embodiment as the best mode of the present invention will be described with reference to the drawings. As shown in FIG. 1, the rust removal treatment apparatus shown in this embodiment is configured to move while being suspended by a suspension wire W inside a steel pipe P of a steel pipe structure such as a steel pipe tower. And this derusting processing apparatus is provided in the main body 1 having a generally elongated shape, a derusting portion 2 disposed below the tip of the main body 1 (lower end in the hanging direction), and the main body 1. The main body 1 is configured to include at least one set (two sets in the case) of support portions 3 having a plurality of support arms 30 that can be opened to hold the main body 1 in a hollow position in the steel pipe P. .

  That is, as shown in FIG. 2, a plurality of support portions 3 that open and close in the radial direction from the central axis of the main body 1 (in the illustrated example, three support portions 3 are provided at intervals of 120 degrees in the circumferential direction of the main body 1. However, a plurality of them may be provided at a predetermined interval in the circumferential direction, such as four at 90 ° intervals in the circumferential direction or two at 180 ° intervals in the circumferential direction). The support arm 30 and an arm drive device 31 for opening and closing the support arm 30 are provided. The arm driving device 31 is engaged with the motor 311, the bolt 312 coupled to the output shaft of the motor 311, the nut 313 screwed to the bolt 312, the rack 314 coupled to the nut 313, and the rack 314. A plurality of (three in this example, the number corresponding to the number of support arms 30) pinions 315 are provided, and one end (base end) of each support arm 30 is fixed to each pinion 315. . A spring member 316 is interposed between the nut 313 and the rack 314 for elastically pushing the rack 314 in the direction in which the support arm 30 opens. When the output shaft of the motor 311 rotates, the bolt 312 rotates, and the nut 313 screwed to the bolt 312 reciprocates in the linear direction along the central axis of the bolt 312. Since the rack 314 is also reciprocated in the linear direction by the reciprocating movement of the nut 313 in the linear direction, the pinion 315 meshed with the rack 314 is rotated, whereby the support arm fixed to the pinion 315 is rotated. 30 rotates around the rotation axis of the pinion 315. That is, the support arm 30 swings about the base end portion as a fulcrum, and thereby opens and closes. In addition, an unintended displacement with respect to the support arm 30, for example, a displacement that attempts to push the support arm 30 back in the closed leg direction by colliding with a projection or the like inside the steel pipe P may act. Can be absorbed by the compression deformation of the spring member 316, and the movement of the rack 314 can be allowed. As a result, a large external force acts due to the above-described unexpected displacement, which damages the support arm 30, the rack 314, the pinion 315, and the like. Can be avoided. Further, each support arm 30 has its distal end abutted against the inner surface of the steel pipe P by an open leg, so that the main body 1 is held in a hollow position in the steel pipe P and substantially at the position of the central axis of the steel pipe P. It has become. For more detailed configurations of the support arm 30 and the arm driving device 31 (the same applies to the grinding arm 20 and the arm driving device 22 described later), see Japanese Patent Application No. 2006-283139 filed by the present applicant. .

  As shown in FIG. 3, the rust removing unit 2 is attached to the output shaft 101 of the rotary drive device 10 provided at the tip of the main body 1, and is rotated by the motor 102 with the central axis of the main body 1 as the rotation axis. The As shown in FIG. 4, the rust removing unit 2 also includes a grinding arm 20 for removing rust, and an arm driving device 22 for opening and closing the grinding arm 20 from the central axis of the main body 1 in the radial direction. It has a configuration. The rust removing portion 2 is basically the same as the configuration of the support portion 3 described above, but differs in that the grinding arm 20 is configured using one of the support arms 30 of the support portion 3. Yes. That is, the arm drive device 22 meshes with the motor 221, the bolt 222 connected to the output shaft of the motor 221, the nut 223 screwed to the bolt 222, the rack 224 connected to the nut 223, and the rack 224. A plurality of (three in this example) pinions 225 are provided, and one end of the grinding arm 20 is connected to one pinion 225. Thereby, the opening / closing leg of the grinding arm 20 is performed by the motor 221. Similarly to the arm driving device 31, a spring member 226 is interposed between the nut 223 and the rack 224 for elastically pushing the rack 224 in the direction in which the grinding arm 20 is opened.

  FIG. 5 is a view showing the grinding arm 20 of the rust removing portion 2, in which (A) shows a front view of the grinding arm 20, and (B) shows a state in which a lighting device described later is removed from (A). The front view of this grinding arm 20 is shown, (C) has shown the right view of (A).

  The grinding arm 20 includes a grinding device 23 on the side of the free end (the other end (tip)) opposite to the one end (base end) on the pinion 225 side. The grinding device 23 is constituted by a conventional grinder having a grinding head 231. Preferably, the grinding device 23 is disposed with the rotation axis of the grinding device 23 appropriately inclined with respect to the extending direction of the grinding arm 20 so that the grinding head 231 is positioned outward from the outer peripheral surface of the grinding arm 20. Is done. Thereby, even if it is a steel pipe of a small internal diameter which cannot almost open the grinding arm 20, a rust removal operation | work can be performed.

  Further, as shown in FIG. 5C, a video camera 25 </ b> A is disposed on the grinding arm 20 above the grinding head 231. The video camera 25 </ b> A is arranged so that the photographing center line is positioned outward from the grinding arm 20 by shifting the position substantially parallel to the extending direction of the grinding arm 20. Thus, the video camera 25A can take a picture to monitor the rust removal work of the grinding head 231, and the grinding arm 20 is closed and the steel pipe P is suspended by the suspension wire W. When moving, it is possible to take a picture to monitor the lower side (tip side). The photographed image is transmitted to the outside of the steel pipe P through a communication line (not shown), and is moved up and down of the rust removal processing device, the open / close legs of the arms 30 and 20, the rotation of the rust removal unit 2, and the grinding device 23. Used by workers during control and the like. In the case shown in the figure, another video camera 25B for monitoring the rust removal work of the grinding head 231 closer is provided, and the images from the two video cameras 25A and 25B are selectively used as necessary.

  Further, as shown in FIGS. 5A and 5C, the grinding arm 20 includes video cameras 25 </ b> A and 25 </ b> B on the left and right sides along the extending direction of the grinding arm 20. A plurality of illumination devices 26 are provided to enable photographing with 25A and 25B. Each lighting device 26 can illuminate a range that can sufficiently cover the shooting range of each video camera 25A, 25B.

  In the rust removal treatment apparatus of the present invention configured as described above, the rust to be rusted while being suspended inside the steel pipe P by the suspension wire W and viewing the video of one or both of the video cameras 25A and 25B. Lower to the point of occurrence. And in order to enable a rust removal operation | work, each support arm 30 in each support part 3 is opened, and the front-end | tip part of each support arm 30 is contacted with the inner surface of the steel pipe P, The main body 1 is made into the steel pipe P. Hold in the hollow position. In this case, the main body 1 is held so that its central axis substantially coincides with the central axis of the steel pipe P. By holding the main body 1 against the steel pipe P in this manner, the grinding head 231 of the grinding device 23 can be pressed against the inner surface of the steel pipe P having rust by the legs of the grinding arm 20. Here, when the position of the grinding head 231 is shifted in the circumferential direction of the inner surface of the steel pipe P from the position of the rust to be rusted, the rust removing portion 2 is rotationally driven by the rotation drive device 10, and the grinding head 231 is moved. Set to the rust removal position. At this time, the grinding arm 20 is biased via the spring member 226 of the arm driving device 22 so that the grinding head 231 is pressed against the position of rust to be rusted with an appropriate elastic force. 20 is preferably opened. Next, a motor (not shown) of the grinding device 23 is operated to perform rust removal work by the grinding head 231, rotation of the rust removal portion 2 by the rotation driving device 10 of the main body 1, and feeding / winding of the suspension wire W In combination, it is possible to perform the rust removal work on the part spread in a planar shape. These operations can be performed while viewing the images sent from the video cameras 25A and 25B.

  FIG. 6 is a view of a rust removing apparatus shown as another embodiment of the present invention. In the derusting apparatus described above, the grinding head 231 of the grinding apparatus 23 installed on the grinding arm 20 is configured so as to be directed generally downward only (that is, the grinding head 231 is in the up / down direction (oblique up / down direction). For example, as shown in FIG. 7, the inner side of the steel pipe P in the joint F connecting the steel pipe P is provided. The grinding head 231 does not reach the rust generated on the lower surface F1 of the protruding portion and the inner surface portion P1 adjacent to the lower surface F1 of the steel pipe P (the lower surface F1 and the inner surface portion P1 are indicated by hatching in the drawing). The rust cannot be removed. On the other hand, the rust removal treatment apparatus shown in FIG. 6 uses the grinding apparatus 23 of the grinding arm 20 so that the direction of the grinding head 231 can be changed so as to protrude upward with respect to the grinding arm 20. It is provided at the tip of a rotating arm 27 that is rotatably attached to the tip.

  That is, the rotary arm 27 has a base end portion rotatably connected to a tip end portion of the grinding arm 20 and is driven to rotate with respect to the grinding arm 20 by the arm turning device 28. In this case, the rotary arm 27 is connected to the tip of the grinding arm 20 so as to be rotatable about a rotation axis in the opening / closing leg movement of the grinding arm 20, that is, an axis parallel to the rotation axis of the pinion 225. ing. As long as the arm turning device 28 can rotate the rotary arm 27, any configuration can be applied. In the illustrated case, however, the tip of the grinding arm 20 (or the base end of the rotary arm 27) is applicable. ) And a small-diameter side gear 282 and a large-diameter side gear 283 that constitute a pair of two-axis crossing gears such as a bevel gear and a hypoid gear. The small-diameter side gear 282 is attached to the output shaft of the motor 281, and the large-diameter side gear 283 is disposed at the proximal end portion of the rotating arm 27 (or the distal end portion of the grinding arm 20). The rotation axis of the large-diameter side gear 283 is provided in parallel with the rotation axis (that is, the rotation axis of the pinion 225) in the opening / closing leg movement of the grinding arm 20. The grinding device 23 is attached to the tip of the rotary arm 27 so that the grinding head 231 protrudes outward from the free end (tip) of the rotary arm 27.

  As shown in the solid line in FIG. 6, the rust removing apparatus provided with the rotating arm 27 is normally held at a position where the grinding head 231 protrudes below the grinding arm 20 extending vertically, and is the same as described above. Rust removal work is performed. At this time, if necessary, it is easy to rotate the rotary arm 27 so that the grinding head 231 is positioned outward from the outer surface of the grinding arm 20 by operating the arm turning device 28. Will be understood.

  Further, when removing rust generated on the lower surface F1 of the joint F shown in FIG. 7 and the inner surface portion P1 adjacent to the lower surface F1 of the steel pipe P, the arm turning device 28 is operated as shown in FIG. Thus, the direction of the rotary arm 27 is changed so that the grinding head 231 faces upward in the steel pipe P. This direction changing operation may be performed after the rust removal processing device is once extracted from the steel pipe P. However, the length of the portion that is rotationally driven by the arm turning device 28 including the grinding device 23 and the rotating arm 27 is the processing length. If it is smaller than the inner diameter of the steel pipe P to be processed, it can be performed in the steel pipe P. Specifically, as shown by a two-dot chain line in FIG. 6, the grinding head 231 rotates the rotary arm 27 in the direction of arrow a which is a direction toward the inner surface of the steel pipe P in a predetermined direction, and the grinding arm 20 is Rotate in the direction of arrow b opposite to the direction of arrow a. Then, while maintaining the state in which the tip of the grinding arm 20 is close to the inner surface of the steel pipe P, the rotating arm 27 is further rotated in the directions of arrows c, d, e, and f, so that the grinding head 231 in the steel pipe P is obtained. Can be turned so as to protrude upward relative to the grinding arm 20.

  Therefore, the grinding device 23 can remove rust on the lower surface F1 of the joint F projecting into the steel pipe P and the inner surface portion P1 adjacent to the lower surface F1 of the steel pipe P.

  In FIG. 6, the grinding head 231 with a shaft having a disk-shaped grindstone is shown. However, the grinding head 231 has a shaft having a grindstone of another shape such as a spherical shape or a conical shape. It may be a thing. Further, as the grinding head 231, a brush with a shaft, a steel bar, a carbide bar, a diamond bar or the like in which at least the cutting edge portion of the outer peripheral surface is made of carbon steel, cemented carbide, diamond or the like may be used. . Even when such a grinding head is used, the shape of the outer peripheral surface formed by the brush or the cutting edge can be formed into a cylindrical shape (disc shape), a spherical shape, a conical shape, or the like as described above. And the rust which generate | occur | produced in the corner part of the lower surface F1 shown in FIG. 7 and the inner surface part P1 can be removed by using the grinding head formed in the cone shape. In addition, when a brush with a shaft is used, it is possible to remove rust generated at the corner even if the brush is not formed in a conical shape due to its flexibility.

  6 shows an example in which the video camera and the lighting device are omitted, the video camera 25A, 25B and the lighting device 26 described above may be provided on the rotating arm 27. Needless to say, it is good.

It is sectional drawing which shows the outline | summary of the rust removal processing apparatus shown as one Example of this invention. It is a fragmentary sectional view which shows the support part in the rust removal processing apparatus. It is a fragmentary sectional view which shows the rotational drive apparatus in the same rust removal processing apparatus. It is a fragmentary sectional view which shows the rust removal part in the rust removal processing apparatus. It is a fragmentary sectional view which shows the grinding arm of the rust removal part in the rust removal processing apparatus. It is a figure which shows the rust removal processing apparatus as other Examples of this invention, Comprising: It is a schematic diagram which shows the rotation modification of a rotation arm. It is sectional drawing of the steel pipe which shows the lower surface of the joint in the steel pipe which can delete rust using a rust removal processing apparatus, and the inner surface part of the steel pipe adjacent to this lower surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Rust removal part 3 Support part 10 Rotation drive device 20 Grinding arm 22 Arm drive device 23 Grinding device 25A, 25B Video camera 26 Illumination device 27 Rotation arm 28 Arm turning device 30 Support arm 31 Arm drive device 101 Output shaft 102 Motor 221 Motor 222 Bolt 223 Nut 224 Rack 225 Pinion 226 Spring member 231 Grinding head 281 Motor 282 Small diameter side gear 283 Large diameter side gear 311 Motor 312 Bolt 313 Nut 314 Rack 315 Pinion 316 Spring member P Steel pipe W Suspension wire

Claims (5)

It is a rust removal treatment device for removing rust generated on the inner surface of a steel pipe, suspended and moved inside the steel pipe of a steel pipe structure,
A generally elongated main body, a rust removing portion disposed below the lower end of the main body in the suspension direction, and a leg that is disposed on the main body and can be opened to hold the main body in a hollow position in the steel pipe. And at least one set of support portions having a supporting arm.
The derusting part includes a grinding arm with a grinding device provided at a distal end thereof, which can be freely opened and closed, and an arm drive for causing the grinding arm to be opened and closed in a radial direction from the main body with the base end of the grinding arm as a fulcrum. With the device,
The said main body is a rust removal processing apparatus provided with the rotation drive device for rotating the said rust removal part by making the central axis of this main body into a rotating shaft. The arm driving device is connected to a motor, a bolt attached to an output rotation shaft of the motor, a nut that is screwed with the bolt and linearly moved in a direction of a central axis of the bolt, and the nut. A rack, and a pinion that meshes with each of the racks and is provided at a base end portion of the grinding arm,
The rust removing apparatus according to claim 1, wherein a spring member for elastically pushing the rack in a direction in which the grinding arm is opened is disposed between the nut and the rack. The grinding device is provided at a distal end portion of a rotating arm disposed on a distal end side of the grinding arm,
The rotating arm has a base end portion rotatably connected to a tip end portion of the grinding arm with an axis parallel to a rotation axis in the opening / closing leg movement of the grinding arm as a rotation axis, and an arm turning device for the grinding arm. Is driven to rotate,
The rust removal treatment apparatus according to claim 1, wherein the grinding apparatus is provided with a grinding head so as to protrude outward.   The grinding arm includes a video camera for photographing a rust removal operation of the grinding device and a lighting device for irradiating a photographing direction of the video camera. The rust removal treatment apparatus according to 1 or 2.   The rotating arm includes a video camera for photographing a rust removal operation of the grinding device while photographing a lower portion of the rust removal processing device, and an illumination device for irradiating a photographing direction of the video camera. 3. A rust removing apparatus according to 3.

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