JP3402931B2 - Boiler header inner surface inspection device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection for inspecting and observing a damaged state of an inner surface of a boiler header due to a high-temperature and long-time operation (start and stop operations) of a boiler or the like. Related to the device. 2. Description of the Related Art FIG. 4 is a sectional view of a header body of a boiler. Reference numeral 1 denotes a header body of a boiler. Reference numeral 2 denotes inspection holes provided at two front and rear positions. 3 is a perforated hole and 4 is a fiberscope. Thus, the inner surface of the header body 1 has the inspection hole 2
Conventionally, when inspecting the inner surface, a fiber scope 4 is inserted through the inspection hole 2 having a vertical direction, and the inner surface of the main body and the vicinity of the perforated hole are observed. [0003] When the boiler is used repeatedly for a long time in accordance with the start and stop of the boiler, the inner ligament portion (remaining portion of the main body of the perforated hole portion) on the inner surface of the boiler header and the like.
A thermal fatigue crack (referred to as a ligament crack) occurs. Inspection of the inner ligament portion of the header body of such a boiler can be observed by using a fiberscope 4 or the like as in the prior art, although the ligament portion at the header end can be observed.
It was not possible to observe the ligament in the center of the header. Therefore, the ligament portion at the end of the header can be maintained and managed, but the ligament at the center of the header cannot be maintained and managed. Eventually, the function as a boiler will be stopped. From the above, it was urgently necessary to conduct a detailed inspection of the inside of the header to prevent accidents. [0005] The present invention provides the following means to solve such problems. A device for observing and inspecting the inner surface of a boiler header body having inspection holes communicating with the inside at both ends, wherein the device is inserted between the inspection holes, passes through the inside of the header body, and passes through a predetermined portion. Two wires stretched at an interval; a surface formed by fixing the two wires at the both ends, stretching the two wires, and rotating a fixing portion of the two wires to form the two wires; A wire fixing portion capable of adjusting a rotation angle in the circumferential direction of the header body; and a pulley engaged with the two wires and running along the same wire. An inner surface observing device that moves along the wire and is rotatable by the wire fixing portion; a television camera and illumination mounted on the inner surface observing device; one end of each of which is fixed to both ends of the inner surface observing device; Remove from the inspection holes at both ends and Boiler tube pulling the inner surface inspection apparatus characterized by comprising; and a manipulation wire for moving the observation device manually in the axial direction of the tube pulling body. According to the present invention, in the above means, an inner surface observing device with a pulley attached to a wire which is extended to observe in detail a damaged state at an arbitrary position on the inner surface of the header with a television camera having good image quality is operated. By pulling, the vehicle can be easily moved back and forth manually, and the wire angle can be arbitrarily changed, so that the television camera mounted on the inner surface observation device can also arbitrarily move back and forth and adjust the angle. Therefore, the entire inner surface of the header can be observed in detail. By employing the present invention as described above, the entire inner surface of the header (in the axial direction and in the circumferential direction) can be easily observed in detail. Therefore, an accident can be prevented beforehand by being able to plan and maintain the damage state. Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a plan view when a boiler header inner surface inspection apparatus according to an embodiment of the present invention is installed on the inner surface of a header body, and FIG. 2 is a side view thereof. In both figures, 1 is a header body, 2 is an inspection hole, and 3 is a perforated hole. Reference numeral 5 denotes two wires extending between the front and rear inspection holes 3. A wire fixing jig 6 fixes the wire 5 at both front and rear ends. 7 is an observation camera, 8
Are illuminations, which are mounted on the observation device body 9. Reference numeral 10 denotes a pulley attached to the main body 9, and a wire 5
Is engaged. Reference numeral 11 denotes a thin wire fixed to both ends of the observation device main body 9, pulled back and forth, and
The main body 9 is moved along. 12 is a manual wire winder for winding one end of the wire 11, 13
Is a camera cable, 14 is a lighting cable, and 15 is an angle indicating board attached to the end face of the wire fixing jig 6. In the boiler header inner surface inspection apparatus having such a configuration, first, two inspection holes 2 provided for inspecting the inner surface of the header body 1 are used to connect two wires 5 to the pipe. It is inserted into the inner surface of the shifting body 1. The inserted two wires 5 are connected to wire fixing jigs 6 installed at both ends, and the wire fixing jig 6 is provided with hooks 16 necessary for stretching the wires 5. The wire 5 is stretched on the inner surface of the header body 1 by a lever block or the like. An observation apparatus main body 9 provided with a camera 7 and an illumination 8 for observing the inner surface is attached to the two wires 5 stretched, and the main body 9 slides on the two wires 5 to move back and forth. Since the pulley 10 for traveling is provided, the pulley 10 is engaged and attached along the wire 5 as shown in FIG. Further, one end of a thin wire 11 required for manually moving the observation device main body 9 back and forth is attached to the front and rear of the observation device main body 9, and the other end of the wire 11 is connected to the header body. 1 is connected to a wire manual winder 12 installed outside. Therefore, in order to move the observation apparatus body 9 back and forth, the wire manual winder 12 installed at both ends is used, and observation is performed by winding the thin wire 11 with the manual winder 12 in the direction to be moved. Pulley 1 of device body 9
At 0, the vehicle runs on two wires 5. The camera 7 has a camera cable 13 for connection to an external monitor or the like, and the illumination 8 is provided with an illumination cable 14 for connection to an external illumination power supply. Can be observed outside the header body 1 in detail. FIG. 3 is a view taken in the direction of arrows AA in FIG.
As shown in the figure, an angle indicating panel 15 is provided on the end face of the wire fixing jig 6 installed at both ends so that the angle of the two wires 5 can be finely adjusted. Can easily be adjusted from the rotation angle of the fixing jig 6, and by adjusting the wire angles of the fixing jigs 6 at both ends, the perforated hole 3 on the inner side of the header can be easily observed in the same direction at any level angle. have. According to the embodiment described above, the camera is mounted on the observation device main body 9 with the pulley 10 attached to the extended wire 5 for observing the damage state on the inner surface of the header in detail with the camera 7 having good image quality. 7 and the main body 9 is easily moved back and forth manually, and the angle indicator 15
Thus, the angle of the wire 5 is accurate and can be arbitrarily changed, so that the entire inner surface of the header (in the axial direction and the circumferential direction of the tube) can be easily observed in detail by the camera 7 and the illumination 8. Therefore,
Accidents can be prevented beforehand by maintaining and managing the damage state systematically. As described above, according to the present invention, the two wires stretched between the inspection holes of the boiler header body and the two wires are fixed at both ends of the body. And has a wire fixing portion and a pulley capable of adjusting the rotation angle in the circumferential direction, and is mounted on a rotatable inner surface observation device, which can move back and forth along two wires by the pulley and can rotate. It features a TV camera, lighting, and an operation wire to manually move the inner surface observation device back and forth, so that the inner surface of the header that could not be observed in detail can be observed in detail, and the state of damage to the inner surface can be checked. Maintenance and management can be performed, and a great effect can be expected for safe and stable operation of the entire plant.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view when a boiler header inner surface inspection apparatus according to an embodiment of the present invention is installed on the inner surface of a header body. FIG. 2 is a side view of the boiler header inner surface inspection apparatus in FIG. 1; FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 2; FIG. 4 is a cross-sectional view of a header body of a boiler, showing a state where a conventional fiberscope for inner surface inspection is inserted. [Description of Signs] 1 Header body 2 Inspection hole 3 Perforated hole 5 Wire 6 Wire fixing jig 7 Observation camera 8 Lighting 9 Observation device body 10 Pulley 11 Thin wire 12 Manual wire winder 13 Camera cable 14 Lighting cable 15 Angle indicating board

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-75105 (JP, A) JP-A-7-145670 (JP, A) JP-A-8-15165 (JP, A) JP-A-60-1985 57815 (JP, A) JP-A-4-22847 (JP, A) JP-A-53-25383 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F22B 37/02 F22B 37 / 22 G01N 21/88

Claims (1)

(57) [Claim 1] An apparatus for observing damage on the inner surface of a boiler header body having inspection holes communicating with the inside at both ends and inspecting the inside of the boiler header body, wherein the device is inserted between the inspection holes. Two wires that pass through the inside of the header body and are stretched at predetermined intervals;
The two wires are fixed at the both ends, stretched, and the fixed portion of the two wires is rotated to adjust the rotation angle of the surface formed by the two wires in the circumferential direction of the header body. A pulley that engages with the two wires and travels along the same wire, moves along the two wires by the pulley, and is rotatable by the wire fixing portion. A television camera and illumination mounted on the inner surface observation device; one end fixed to each end of the inner surface observation device, and the other end taken out from each of the inspection holes at both ends. A boiler header inner surface inspection apparatus, comprising: an operation wire for manually moving the header body in the axial direction.