JPH0330857Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe rotation support device for rotating a pipe, such as a cast iron pipe or a steel pipe, when inspecting the pipe for defects.

Eddy current flaw detection equipment is commonly used to inspect pipes such as cast iron pipes and steel pipes for defects. When inspecting with this flaw detection device, as shown in FIG.
A detector 3 supported on the tube 2' and having an arcuate recess 3a formed therein which approximately matches the outer diameter of the tube 1 is disposed with a predetermined gap, and in this state, the detector 3 is supported on the tube 1. 3 is moved along the tube axis to inspect the upper half. Once the upper half has been inspected, the rotating rollers 2, 2' are rotated to rotate the tube 1, for example, by 180 DEG, and the remaining section is inspected in the same manner as above. By the way, the rotary rollers 2 and 2' of this tube rotation support device are fixedly arranged on the rotation drive mechanism, and the roller diameter is also constant, so when supporting a tube with a small diameter, the tube axis position will rotate. Because it is lower than the top surface of rollers 2 and 2',
The detector 3 overlapped with the rotating rollers 2 and 2' and could not be moved over the entire length in the tube axis direction, making it impossible to perform eddy current flaw detection.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tube rotation support device that can eliminate the above-mentioned drawbacks.

That is, in the present invention, when a tube is inspected for flaws using a detector that is formed with an arcuate concave portion that approximately matches the outside diameter of the tube and is movable along the tube axis,
A tube rotation support device that rotatably supports a tube to be inspected, and includes a pair of left and right first rollers that support a large diameter tube at both end positions on a bed, and a rotation drive that rotates the first rollers. A pair of elevating frames are provided with a shaft and are movable up and down in the vertical direction by being guided by guide bodies provided at both ends of the bed. Second
A roller is provided, a plurality of sprockets are provided on each of the second rollers and the lifting frame, and a driving sprocket is provided on the rotational drive shaft, and a sprocket on the lifting frame side with respect to the driving sprocket can be moved up and down on each of the sprockets. like,
Wrap the endless chain around the lifting frame,
A pipe rotation support device comprising a cylinder device that moves up and down between an upper position where a small diameter pipe is supported by a second roller and a lower position where a large diameter pipe is supported by a first roller. be.

According to this configuration, the first roller that supports the large-diameter pipe and the second roller that supports the small-diameter pipe are provided on the same bed, and the second roller is provided on the elevating frame that is movable up and down. Therefore, large diameter pipes and small diameter pipes can be selectively supported at the same position, and therefore pipes of different diameters can be tested for eddy current flaws on the same bed. In addition, a plurality of sprockets are arranged on the elevating frame, and an endless chain is wound around the driving sprocket supported on the bed side to allow the elevating frame to move up and down. If the drive sprocket is linked to the rotational drive device for the supported first roller, only one rotational drive device is required.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5. Reference numerals 11 and 11' denote a pair of left and right first rollers that are rotatably supported at positions near both ends of the upper bed 12, and are used to support the large diameter pipe 13. Note that the first roller 11,
11', a second roller, an elevating frame, etc., which will be described later, are the same at the front and rear positions of the bed 12, so the drawings show the configuration of one end, and the one end will be explained. Reference numeral 14 denotes a rotation drive shaft that rotates at least one of the first rollers 11, 11' and a second roller (described later). That is, the rotary drive shaft 14 is rotatably supported via a bearing 15 at a central position above the upper bed 12 and below the first rollers 11, 11', and the first rollers 11, 11 are supported on the way. ’ support shaft 1
A second gear 18 that meshes with a first gear 17 attached to the second gear 6 is attached, and the rear end thereof extends into the elevating frame, which will be described later. Although not shown, a rotation drive device for a rotation drive shaft 14 is provided on the upper bed 12. Reference numeral 19 denotes an elevating frame that is movable up and down at positions corresponding to the front and rear ends of the upper bed 12, and this elevating frame 19 is provided with a pair of left and right second rollers 21, 21' that rotatably support the small diameter pipe 20. attitude.

That is, on the lower bed 22 provided outside and below the upper bed 12, a pair of left and right guide bodies 23, 23' having vertical guide grooves 23a, 23'a, respectively, are erected. The elevating frame 19 includes a rectangular frame 24 having a through hole 24a in the center, and guide roller portions 25 attached to both outer surfaces of the frame 24 and inserted into the guide grooves 23a and 23'a. 25'. At the upper position of the frame body 24, a pair of left and right second rollers 21, 21' that rotatably support the small diameter pipe 20 are connected to support shafts 26, 21'.
The second rollers 21, 21' are coupled to the rotary drive shaft 14 so as to allow the elevating frame 19 to move up and down, and are rotationally driven. That is, the support shafts 26, 26' include:
A first sprocket 27 connected to the second roller 21 on the left side and a second sprocket 28 connected to the second roller 21' on the right side are rotatably supported,
Further, at a lower position of the frame body 24, a third sprocket 29 and a fourth sprocket 30 are rotatably supported via support shafts 31, corresponding to the first sprocket 27 and the second sprocket 28, respectively. Furthermore, each of the above sprockets 27,
A drive sprocket 32 is located at an upper position in the through hole 24a in a vertical plane including 28, 29, and 30 and between the left and right and upper and lower positions of each sprocket 27, 28, 29, and 30, and an idler is located at a lower position. A sprocket 33 is arranged. The drive sprocket 32 is integrated with a third gear 36, which is rotatably supported by a support shaft 35 protruding from a bracket 34 provided at the end of the upper bed 12. is rotatably supported at the end of a rotary drive shaft 14 supported on the upper bed 12. The drive sprocket 32, the third gear 36, and the rotary drive shaft 14 are interlocked and connected by a fourth gear 37, and each of the sprockets 27, 28, 29,
An endless chain 38 is wound around the sprockets 30, 32, 33 so that the first to fourth sprockets 27, 28, 29, 30 can be moved up and down relative to the drive and idle sprockets 32, 33. That is, the endless chain 38 is connected to the lower side of the drive sprocket 32, the upper side of the first sprocket 27, the lower side of the third sprocket 29, the upper side of the idle sprocket 33, the lower side of the fourth sprocket 30, and the second sprocket 28. It is wrapped around the upper side of the . Therefore, even if the elevating frame 19 moves up and down, the first and second sprockets 27 and 28 and the drive sprocket 3
Since the sum of the distance _l1 between the axes of the second sprocket 2 and the distance _l2 between the axes of the third and fourth sprockets 29, 30 and the idle sprocket 33 is always constant,
The rollers 21, 21' can be rotated by a rotary drive shaft 14 supported on the fixed upper bed 12. 39 is an air cylinder (cylinder device) located inside the lower bed 22;
The lifting frame 19 is moved by the second rollers 21 and 2.
1' to support the small diameter pipe 20 (shown in FIG. 5), and the first rollers 11, 11' to support the large diameter pipe 13 in the lower position (shown in FIG. 4). This is for raising and lowering between the two. The amount of elevation at this time is such that the tube axes of the large-diameter tube 13 and the small-diameter tube 20 that are supported are aligned with each other.

In the above configuration, when performing eddy current flaw detection on the large diameter pipe 13, as shown in FIG.
9 to the lower position, and the first roller 11,
After placing the large diameter tube 13 on the large diameter tube 11', the detector 40 of the eddy current flaw detector is set on the large diameter tube 13 and the detector 40 is moved along the tube axis direction.
When the eddy current flaw detection of the upper half is completed, the first rollers 11 and 11' are rotated via the rotary drive shaft 14 to position the lower half of the large diameter pipe 13 on the upper side.
Eddy current flaw detection is performed in the same manner as above.

Next, when performing eddy current flaw detection on the small diameter pipe 20, as shown in FIG.
After raising the elevating frame 19 to the upper position and placing the small diameter pipe 20 on the second rollers 21, 21',
As in the case of the large diameter tube 13, the detector 40 may be set in the upper half of the small diameter tube 20 and moved in the direction of the tube axis. After the eddy current flaw detection of the upper half is completed,
When the rotary drive shaft 14 is rotated, the first and second sprockets 27, 2 are connected via the endless chain 38.
8, that is, the second rollers 21, 21' rotate, and the small diameter tube 20 is reversed. Then, the detector 40 may be moved again and the remaining portion may be subjected to eddy current flaw detection.

According to the above configuration, the first roller supporting the large diameter pipe is supported on the upper bed, and the second roller supporting the small diameter pipe is supported on the lower bed via the elevating frame. It is possible to selectively support tubes at the same axial position, and therefore tubes of different diameters can be tested using the same device. Further, the first to fourth sprockets are arranged on the elevating frame, and an endless chain is wound around the drive sprocket and idle sprocket, which are directly supported on the bed side, to allow the elevating frame to move up and down. Further, since the drive sprocket is interlocked and connected by a rotary drive shaft that rotates the first roller, only one rotary drive device is required.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a conventional example, Figs. 2 to 5 show an embodiment of the present invention, Fig. 2 is a sectional view of the main part, and Fig. 3 is a view taken from the - arrow in Fig. 2. FIGS. 4 and 5 are views taken along the - arrow in FIG. 2. 11, 11'...First roller, 12...Upper bed, 13...Large diameter pipe, 14...Rotation drive shaft, 1
9...Elevating frame, 20...Small diameter pipe, 21,2
1'...Second roller, 22...Lower bed, 23,
23'...Guide body, 26, 26'...Support shaft, 2
7...First sprocket, 28...Second sprocket, 29...Third sprocket, 30...Fourth sprocket
Sprocket, 31...Support shaft, 32...Drive sprocket, 33...Idle sprocket, 3
6... Third gear, 37... Fourth gear, 38... Chain, 39... Air cylinder (cylinder device).

Claims (1)

[Scope of utility model registration request] A tube rotation mechanism that rotatably supports the tube to be inspected when the tube is inspected for flaws using a detector that is formed with an arcuate recess that approximately matches the outer diameter of the tube and is movable along the tube axis. The support device is provided with a pair of left and right first rollers that support the large diameter pipe at both end positions on the bed, and
A rotary drive shaft for rotating the rollers is provided, and a pair of elevating frames are provided which can be raised and lowered in the vertical direction by being guided by guide bodies provided at both ends of the bed, and a small diameter pipe is installed at the top of each elevating frame. A pair of left and right second rollers are provided to support the second rollers, a plurality of sprockets are provided to each of the second rollers and the elevating frame, and a drive sprocket is provided to the rotational drive shaft, and each of the sprockets includes:
An endless chain is wound so that the sprocket on the elevating frame side can move up and down with respect to the drive sprocket, and the elevating frame is placed at an upper position where the small diameter pipe is supported by the second roller, and by the first roller. A pipe rotation support device characterized by being provided with a cylinder device that moves up and down between a lower position that supports a large diameter pipe.