JP3481128B2 - Inspection equipment for pipe joints - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint sealing inspection apparatus. [0002] After joining a pipe joint formed of a cast iron pipe or the like, it is called a test band to inspect whether or not the pipe joint is joined in a well-sealed state. An airtightness inspection device is used. FIG. 9 shows a conventional sealing test apparatus of this kind. Here, reference numeral 1 denotes one of the cast iron pipes joined to each other, and a receiving port 2 is formed at the tip thereof. Reference numeral 3 denotes the other tube, and an insertion port 4 to be inserted into the receiving port 2 of the one tube 1 is formed at the tip of the other tube. Reference numeral 5 denotes a ring-shaped rubber sealing material, which is disposed between the inner peripheral surface of the receiving port 2 and the outer peripheral surface of the insertion port 4 to seal between the receiving port openings. The sealing member 5 is pressed by an unillustrated pressing mechanism against the inner peripheral surface of the receiving port 2 and the outer peripheral surface of the insertion port 4 with a predetermined sealing surface pressure. The joints of the pipes 1 and 3 are configured as described above. [0004] Reference numeral 7 denotes a conventional airtightness inspection apparatus, which has a carriage 8 that can travel in a pipe. The cart 8 has a four-wheel structure, and has a pair of wheels 10 at the front and rear. A support ring 9 having an annular frame structure is mounted on the carriage 8. 1
Reference numeral 2 denotes a plurality of holding bolts in the circumferential direction, which are configured to be screwed radially outward from the support ring 9.
At the tip of the holding bolt 12, an annular holding plate 13 divided into a plurality in the circumferential direction corresponding to the holding bolt 12 is provided.
Are connected. An annular rubber packing material 14 is provided on the outer peripheral side of the holding plate 13. The packing material 14 is arranged from the inner surface of the receiving port 2 to the inner surface of the insertion port 4. According to such a configuration, by operating the holding bolt 12 of the bogie 8 moved to the joint portion between the pipes 1 and 3, each of the holding plates 13 divided into a plurality in the circumferential direction is divided. The portion is moved radially outward, whereby the pressing plate 13 is displaced so as to expand in diameter, and the packing material 14 is pressed against the inner peripheral surfaces of the receiving port 2 and the insertion port 4. [0006] As a result, an annular closed space 15 is formed between the receiving port 2 and the insertion port 4 on the outer peripheral side of the packing material 14, and pressurized water or the like is pressurized in the space 15. The fluid is injected and its pressure is examined over time. If the pressure does not decrease even after the lapse of time, it can be determined that the sealing state of the joint portion is good. When the pressure decreases with the passage of time, it is detected that leakage from the joint to the outside of the pipe has occurred, and therefore, it is possible to determine that the sealing state of the joint is poor. [0007] When the sealing state of the joints of the pipes 1 and 3 is inspected by using the conventional sealing inspection apparatus 7, FIG.
As shown in (1), the packing material 14 is previously arranged from the inner surface of the receiving port 2 of the pipe 1 to the inner surface of the insertion port 4 of the pipe 3 in the joint portion. Then, the truck 8
Is moved, and the set state shown in FIG. 9 is completed. [0008] However, as shown in FIG. 9, the truck 8 must be placed over the packing material 14, and at this time, any one of the front and rear wheels 10 of the truck is required.
Must overcome the packing material. For this reason,
Using the inclined guide block 16 as shown in FIG.
There is a problem that it is necessary to get over. Further, when the carriage 8 is moved from a distance toward the joint to be inspected, or when the carriage 8 is carried out of the tube after the inspection is completed, the packing material 14 does not exist, and therefore, the tip of the insertion hole 4 is not provided. In order to prevent the derailing from occurring in the recess between the inner end of the socket 2 and the rear end, the cart 8 has to be lifted and passed through this recess by manual power. is there. Accordingly, the present invention solves the above problems and eliminates the problem of the packing material at the sealing test place in the pipeline and the recess of the joint portion other than the test place by the truck of the seal test apparatus. It is intended to enable easy and trouble-free passage without any difficulty. [0010] In order to achieve the above object, the present invention is to dispose a ring-shaped pressing plate on a bogie that can travel in a pipe, and provide an outer peripheral side of the pressing plate with a joint portion. An annular packing material is provided from the inner periphery of one tube to the inner periphery of the other tube and is pressed against the inner surface of the tube by the pressing plate, and the bogie is provided at one end of the bogie relative to the pressing plate. A first wheel, a second wheel provided at a distance from the first wheel to one end of the bogie, a third wheel at the other end of the bogie relative to the holding plate, A fourth wheel is provided at a distance from the third wheel to the other end of the bogie, and the first wheel and the second wheel are configured to be selectively usable, and The third wheel and the fourth wheel can be selectively used. Things. With such a configuration, for example, when it is necessary to cross the obstacle at the one end side of the bogie such as the packing material at the sealing inspection site or the concave portion of the joint at a position other than the inspection site, the second step is performed. The second wheel is passed through the obstacle in a state where the first wheel is used without using the wheel. Thereafter, using the second wheel and the first
Are switched to a state where they are not used, and the first wheel is passed through the obstacle. In the case where the failure location is a sealing inspection site, the truck, that is, the pressing plate straddles the packing material, and the sealing test can be performed by pressing the packing material with the pressing plate. is there. After the inspection, the third wheel and the fourth wheel are similarly used alternately so that the third wheel and the fourth wheel pass through the obstacle, that is, the packing material. In the case where the obstacle is the concave portion of the joint portion, after the first wheel passes through the concave portion, the third wheel is not used, and the third wheel is used. Pass the wheel through the recess. Thereafter, the third wheel is used and the fourth wheel is switched off, and the fourth wheel is passed through the recess. As a result, all wheels can easily and without difficulty cross the recess without difficulty. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 6, and the same members as those shown in FIGS. Then, it will be described in detail.
As shown in the figure, a pair of housings 22 spaced apart in the circumferential direction are provided at the center of the bogie 21 along the pipe axis direction in the seal inspection device 20. Support ring 23
Are arranged along the inner circumference of the tubes 1 and 3 such that the bottom 24 is located below the housing 22. The support ring 23 is supported by the bogie 21 in a state where the bottom portion 24 is suspended from the housing 22 of the bogie 21 via a tension coil spring 25 so as to be centered with respect to the tubes 1 and 3. . The support ring 23 is provided with a cylinder device 26 at a plurality of positions in the circumferential direction, and the holding plate 13 is attached to the expansion / contraction end of the cylinder device 26, so that the holding plate 13 can be expanded and reduced in diameter. Have been. In each of the housings 22 of the carriage 21, brackets 2 protrude from the support ring 23 at one end and the other end of the carriage 21 along the tube axis direction.
8, 28 are provided. Each bracket 28 has a pair of bosses 29, 29 spaced apart in the tube axis direction, and the bosses 29, 29 allow a round bar bar 30, 29 in the tube axis direction.
30 are each supported in a fixed state. The bases of a wheel case 32 supporting a first wheel 31 and a wheel case 34 supporting a third wheel 33 are provided at the respective bars 30, 30 between the bosses 29, 29. The part is supported in an fitted state so as to be pivotable about the axis of the bar 30. The pair of wheel cases 32, 32 and the wheel cases 34, 34 are connected to each other by a turnbuckle 35. By operating the turnbuckle 35, the wheel cases 32, 32 and the wheel case The configuration is such that an opening angle between the wheel cases 32, that is, a turning position of the wheel cases 32 and 34 around the axis of the bar 30 can be defined. More specifically, as shown in FIG. 2, the wheel cases 32, 32, 34, 34 are so arranged that the treads of the first wheel 31 and the third wheel 33 contact the plane 36 outside the tube. The turnbuckle 35 is adjusted in advance. Further, as shown in FIG. 2, the bogie 21 is adjusted in such a manner that the tread surfaces of the wheels 31 and 33 are adjusted to be in contact with the flat surface 36.
Is carried into the pipes 1 and 3, this wheel 3
The outer edges of the pipes 1, 33 are configured to contact the inner surfaces 37 of the tubes 1, 3. In a state where the tread surfaces of the wheels 31 and 33 are adjusted so as to be in contact with the plane 36, the wheel case 32,
The wheel cases 32 and 34 are further moved so that the wheel cases 32 and the wheel cases 34 and 34 do not move obliquely due to the parallel movement, that is, so that the wheel cases 32 and the wheel cases 34 do not open outward from this state. Is provided with a stopper mechanism for restricting the turning of the shaft. As shown in FIG. 1 and the like, the stopper mechanism is screwed out from the wheel cases 32 and
8 is constituted by bolts 17. For this reason, the wheel cases 23 and 24 are turned by the operation of the turnbuckle 35 as shown by the solid lines in FIG.
3 and a position turned inward from the position shown by the solid line, that is, a position separated from the inner surface 37 of the tubes 1 and 3 as shown by a virtual line in FIG. It is configured to be able to turn only at. The turnbuckle 35 has one end 35A.
Is one of the wheel cases 32, 32 and the wheel case 34,
One of the wheel cases 34 is rotatably connected around a horizontal axis, and the other end 35B is detachably connected to the other of the wheel cases 32, 32 and the other of the wheel cases 34, 34. That is, the other end 35B is
As shown by arrow A in FIG.
2 and the other one of the wheel cases 34, 34 so that they can be lifted upward. Each bar 30 is provided with a flip-up portion 41 at one end and the other end thereof. The flip-up portion 41 is formed of a round bar having the same thickness as the bar 30, and is swung around a pin 42 at the tip of the bar 30, so as to be continuous with an extension of the bar 30, and upward from this position. It is configured so as to be able to take the position that is flipped up. A wheel case 44 supporting a second wheel 43 provided at a distance from the first wheel 31 to the end of the bogie 21 is provided at the one end side and the flip-up portion 41 at the other end side.
And a wheel case 46 supporting a fourth wheel 45 provided at a distance from the third wheel 33 toward the end of the bogie 21.
Are fixed in an externally fitted state.
As shown in FIG. 2, the treads of a pair of second and fourth wheels 43, 45 provided at a distance in the circumferential direction of the tubes 1, 3 are inner surfaces of the tubes 1, 3, respectively. 37
Are fixed to the flip-up portions 41 in the direction in contact with. The pin 42 is provided in a direction parallel to the rotation axis of the wheels 43 and 45 in this state, so that the flip-up portion 41 can be flipped obliquely in a direction substantially toward the center of the tubes 1 and 3. It is configured. The slide pipe 18 is fitted over the bar 30 and the flip-up portion 41 corresponding to the pin 42. Also, the slide pipe 18 and the wheel case 44,
The compression coil spring 19 is externally fitted to a portion of the flip-up portion 41 between the spring 46 and the spring 46. The compression coil spring 19 pushes the slide pipe 18 until it hits the boss 29, thereby holding the slide pipe 18 in a state where the slide pipe 18 is fitted over the bar 30 and the flip-up portion 41 corresponding to the pin 42. Therefore, in the normal state, the flip-up section 41 is configured so as not to be flipped up by being hindered by the slide pipe 18. That is, the slide pipe 18 is disengaged from the position of the bar 30 and the flip-up portion 41 corresponding to the pin 42 against the force of the spring 19, and is slid in a direction approaching the wheel cases 44 and 46 for the first time. It is configured to be able to perform the jump. Each flip-up section 41 has a wheel case 44,
A grip portion 4 protruding further to the tip side than the fixed portion 46
7 are formed. Then, when the operator has
It is configured such that a flip-up operation or the like of the flip-up unit 41 can be performed by holding the grip 7. In such a configuration, when the truck 21 of the seal inspection device 20 is run inside the pipes 1 and 3,
As shown in FIG. 1, four types of wheels 43, 31, 33, 45
, That is, with eight wheels in contact with the inner surfaces 37 of the tubes 1 and 3. Alternatively, the position of the slide pipe 18 is displaced so as to approach the wheel cases 44 and 46 against the spring 19, the grip portion 47 is operated to lift the flip-up portion 41, and the second and fourth wheels 43 and 45 are moved. By moving away from the inner surfaces 37 of the tubes 1 and 3, only the four wheels of the first and third wheels 31, 33 are connected to the inner surface 3 of the tubes.
It is also possible to make the vehicle travel in a state in which it is brought into contact with 7. Additionally or alternatively, the turnbuckle 35 is operated to pivot the first and third wheels 31,33 around the bar 30 and away from the inner surface 37 of the tube, thereby allowing the second and fourth wheels 4
It is also possible to run the vehicle in a state where only the three wheels 45 are in contact with the inner surface 37 of the pipe. As shown in FIG. 1, a packing material 14 is preliminarily applied to a joint portion between the pipes 1 and 3, and at this time, the packing material 14 projects radially inward from an inner surface 37 of the pipe. It is in a state of having done. Then, when the second wheel 43 approaches the protruding packing material 14 due to the traveling of the cart 21, as shown in FIG.
These second wheels 43 are moved away from the inner surface 37 of the pipe, that is, the packing material 14 by flipping up the flip-up portions 41 corresponding to the wheels 43. Thereby, the second wheel 43 can pass above the position of the packing material 14 without any trouble. When the second wheel 43 has passed the position of the packing material 14, the flip-up portion 41 is returned to its original position,
Wheel 43 again contacts the inner surface 37 of the tube. As a result, the slide vipes 18 are automatically returned to a position where they cover the bar 30 and the flip-up portion 41 corresponding to the pins 42 by the force of the spring 19. At the same time, the operation of the turnbuckle 35 causes the pair of first wheels 31 to separate from the inner surface 37 of the pipe so that the wheel case 3
Turn 2 As a result, as shown in FIG.
Wheels move away from the inner surface 37 of the pipe, and these first wheels 31 can pass through the position of the packing material 14 without any trouble. When the first wheel 31 has passed the position of the packing material 14, the turnbuckle 35 is operated in the opposite direction to bring the first wheel 31 into contact with the inner surface 37 of the pipe again.
Then, as shown in FIG.
3 will straddle the packing material 14. Therefore, by pressing the packing material 14 with the pressing plate 13, it is possible to inspect the tightness of the joint between the pipes 1 and 3. When the inspection is completed, turnbuckle 35
This time, the third wheel 33 is moved away from the inner surface 37 of the pipe to pass through the position of the packing material 14, and then the third wheel 33 is again brought into contact with the inner surface 37 of the pipe, and the flip-up section 41 is operated. As a result, the fourth wheel 45 is moved away from the inner surface 37 of the pipe and passes through the position of the packing material 14. In the above description, the case where the wheels 43, 31, 33, and 45 pass through the position of the packing material 14 at the time of inspection of airtightness has been described, but the inspection apparatus 20 is moved toward the joint to be inspected. When the inspection is performed or when the inspection apparatus 20 after the inspection is carried out of the pipe, the gap between the front end of the insertion port 4 and the rear end of the receptacle 2 is present as a recess without the packing material 14. It is necessary to make the carriage 21 travel for the part where the vehicle is to be moved. In that case, the wheels 43, 3
By sequentially moving 1, 33, 45 away from the inner surface 37 of the tube, it is possible to pass through the position of this concave portion. When the device 20 is taken out of the tube after the inspection and stored in an appropriate place, both the flip-up portions 41 at both ends are flipped up as shown in FIG. If only the four wheels, the first wheel 31 and the pair of third wheels 33, support the cart 21, the support ring 9, and the holding plate 13, a compact folded state that does not take up space as shown in the figure. Storage becomes possible. As described above, according to the present invention, the first wheel on one end side of the bogie relative to the holding plate for pressing the packing material is provided on the bogie that can travel in the pipe, and the first wheel. A second wheel provided at a distance from one end of the bogie to
A third wheel provided on the other end of the bogie with respect to the holding plate, and a fourth wheel provided at a distance from the third wheel to the other end of the bogie; And the second wheel are configured to be selectively usable, and the third wheel and the fourth wheel are configured to be selectively usable. The bogie can be run with the wheels that have not been moved away from the packing material.Therefore, with respect to obstacles such as the packing material at the inspection location and the concave portion of the joint portion other than the inspection location, the bogie of the sealability inspection device Can be passed easily and without difficulty with no difficulty.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a running state of a pipe joint sealing inspection device according to an embodiment of the present invention. FIG. 2 is a side view of the inspection apparatus. FIG. 3 is a front view showing a traveling state of the inspection device in a stage next to FIG. 1; FIG. 4 is a front view showing the traveling state of the inspection device in the next stage of FIG. 3; FIG. 5 is a front view showing the inspection apparatus in a state next to FIG. 4; FIG. 6 is a front view showing a state at the time of storage of the inspection apparatus. FIG. 7 is a front view showing a state during traveling by a conventional pipe joint airtightness inspection device. FIG. 8 is a front view showing a running state of the conventional inspection device at a stage next to FIG. 7; FIG. 9 is a front view showing a state at the time of inspection by a conventional inspection device. [Description of Signs] 1 Cast iron tube 3 Cast iron tube 13 Pressing plate 14 Packing material 21 Cart 30 Bar 31 First wheel 33 Third wheel 35 Turnbuckle 41 Flip-up portion 43 Second wheel 45 Fourth wheel

Continuing from the front page (72) Inventor Masayoshi Ozawa 2-16-1, Sakaemachi, Funabashi-shi, Chiba Prefecture Inside the Kubota Funabashi Plant (72) Inventor Hisashi Suzuki 2-161-1, Sakaemachi, Funabashi-shi, Chiba Prefecture Kubota Funabashi Co., Ltd. In-plant (56) References JP-A-61-172029 (JP, A) JP-A-57-10435 (JP, A) JP-A-63-240 (JP, U) (58) Fields investigated (Int. . ^7, DB name) G01M 3/28 F16L 55/00 F17D 5/04

Claims (1)

(57) [Claims 1] An annular pressing plate is disposed on a bogie that can travel in a pipe, and the outer side of the pressing plate is provided from the inner circumference of one pipe to the other in the joint portion. An annular packing material is provided over the inner periphery of the tube and pressed against the inner surface of the tube by the holding plate, and the bogie has a first wheel on one end side of the bogie than the holding plate, and A second wheel provided at a distance from the first wheel to one end of the bogie, a third wheel at the other end of the bogie relative to the holding plate, and a third wheel of the bogie from the third wheel. A fourth wheel provided at a distance from the other end is provided so that the first wheel and the second wheel can be selectively used, and the third wheel and the fourth wheel can be selectively used. A seal inspection device for pipe joints, characterized in that wheels and a wheel can be selectively used.