JPH0816643B2 - Holding device for hydraulic tester for pipes - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding device for a hydraulic tester for pipes.

[0002]

2. Description of the Related Art As a conventional device for holding a hydraulic tester for pipes, for example, a high-pressure hose having an annular recess into which one end of the pipe in the central axis direction is fitted in a liquid-tight manner and which applies hydraulic pressure to the inside of the pipe. A first platen provided, a second platen connected to the first platen by a rod, a cylinder device fixed to the second platen, and a cylinder device connected to the other end of the pipe in the direction of the central axis. It is known to have a sealing flange having an annular recess that is closely fitted.

[0003]

However, in such a conventional device for holding a hydraulic tester for a pipe, the pipe to be sandwiched between the first platen and the seal flange is sandwiched by the cylinder device. Since the structure is such that it is pressed and held, pressure leakage is likely to occur in the cylinder device,
The pressure of the pipe is insufficient to cause water jet accident. As a result, there was a technical problem that it was not suitable for the high pressure test.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional technical problems, and its structure is an annular shape in which one end portion of the pipe in the central axis direction is fitted in a liquid-tight manner. A first platen having a recess and having a high-pressure hose for applying water pressure to the inside of the pipe; a second platen connected to the first platen by a tie rod; and a spindle connected to the second platen with a screw A support member that is supported at the end of the spindle on the first platen side so as to be rotatable relative to the center axis, and an annular recess that is connected to the support member and that fits the other end of the pipe in the center axis direction in a liquid-tight manner. A seal flange having a point and a rotary drive device for rotationally driving the spindle, supporting the supporting member on the spindle so as to be movable in the central axis direction, and by using a spring interposed between the supporting member and the supporting member. Provided urged toward the platen, the holding device of the hydraulic tester pipe, characterized in that to secure at normal a predetermined gap between the support member and the spindle
It is.

[0005]

According to this holding device for a hydraulic tester for a pipe, however, the pipe is positioned between the annular recess of the first platen and the annular recess of the seal flange which face each other, and one end of the pipe is moved to the first recess. It is fitted liquid tight in the annular recess of the platen.
Then, the spindle is rotatably driven by the rotation driving device to move the spindle coupled to the second platen with a screw to one end side, and the other end of the pipe is liquid-tightly fitted into the annular recess of the seal flange. At that time, the supporting member supported by the spindle so as to be rotatable relative to the center axis is non-rotating, and the seal flange connected to the supporting member is also non-rotating.

By the first platen and the seal flange,
When the required clamping force acts on the pipe, the rotary drive is stopped. When the pipe is held between the first platen and the seal flange in this way, a predetermined water pressure from the water pressure source is applied to the inside of the pipe through the high pressure hose to perform a water pressure test on the pipe. Since the spindle is screwed to the second platen, it does not move due to water pressure acting in the central axis direction. Thus, a long-term water pressure test can be performed without causing water leakage due to the movement of the seal flange. When the water pressure test is completed, the water in the pipe is discharged, and the rotary drive device is driven to return the spindle and the seal flange to the other end side to secure a sufficient space between the seal flange and the first platen. And remove the pipe.

The support member is supported by the spindle so as to be movable in the direction of the central axis, and is urged toward the first platen by a spring interposed between the support member and the spindle to provide a support member and a spindle. Since a predetermined gap is secured in the normal state, one end of the pipe comes into contact with the annular recess of the first platen, and the reaction force of the pipe begins to act on the support member via the seal flange. The spring inserted in the will start to be compressed. Therefore, as long as there is a gap between the support member and the spindle, the seal flange is kept in the non-rotating state, and the required clamping force can be applied to the pipe in this state.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1-6 shows one Example of the holding device of the hydraulic tester for pipes. In the figure, reference numeral 1 is a base 1
5 shows the first platen arranged in FIG. 5, and has an annular recess 1a in which one end of the pipe 2 in the central axis direction is fitted in a liquid-tight manner in the central part. Actually, as shown in FIG. 5, the liquid tightness is maintained by interposing the seal member 1c between the inner circumference of the pipe 2 and the end surface of the first platen 1. The high-pressure hose 1d joined to the first platen 1 is connected to a water pressure source (not shown) to apply water pressure to the inside of the pipe 2. 1e is a semi-annular convex portion formed on the outer peripheral edge of the lower end portion of the annular recess 1a, and has a function of supporting one end of the pipe 2 and guiding it to the annular recess 1a.

The second platen 4 is arranged opposite to the first platen 1 on the base 15, and the two plates 1 and 4 are connected by a plurality of tie rods 3. On the second platen 4,
As shown in detail in FIG. 3, the spindle 5 is connected to the center of the spindle 5 with a single irreversible screw 23, and one end of the spindle 5 on the side of the first platen 1 is attached to the base 15. It is supported by a fixed guide member 6 so that it can move freely in the central axis direction. 6a is a bush.

A support member 7 is rotatably supported on one end of the spindle 5 about a central axis. Specifically, as shown in detail in FIG. 4, one end of the spindle 5 has a first hole 5a, a second hole 5b, and a third hole 5a that gradually increase in diameter from the bottom side.
The first step surface 5e is provided between the hole 5c and the fourth hole 5d,
The second step surface 5f and the third step surface 5g are interposed to form a recess 5h in the central axis direction. Then, the shaft member 9 in which the outward flange portion 9a is slidably guided to the second hole 5b is compressed by the spring 8 interposed between the outward flange portion 9a and the first step surface 5e. Then, push it toward one end and insert it. Reference numeral 5i is an annular member that is fixed to the second step surface 5f and that abuts and supports one end surface of the outward flange portion 9a of the shaft member 9.

A pair of bearings 10a, 10b having an inner ring fixed to the small diameter portion 9b of the shaft member 9 is provided at one end of the shaft member 9.
The small-diameter portion 7a of the support member 7 is rotatably supported with the interposition of. The outer rings of the bearings 10a and 10b are fixed to both sides of the inward flange portion 7c of the through hole 7b formed in the central portion of the support member 7, respectively. 7 g is a bush, and 7 e is a lid that closes one end of the through hole 7 b. 5
j is a bush that is locked to the third step surface 5g and fitted into the fourth hole 5d, and is brought into contact with the outer peripheral surface of the small-diameter portion 7a of the support member 7. Oil sump 5k on the inner surface of bush 5j
Is provided so that oil can be supplied from the outside through the oil hole 5m. Thus, the large diameter portion 7d at one end of the support member 7
The annular inner side surface of the shaft member 9 is in a normal state in which the outward flange portion 9a of the shaft member 9 is in contact with the annular member 5i by the elastic force of the spring 8 and forms a predetermined gap δ with one end surface of the spindle 5. are doing.

A seal flange 11 is connected to one end of such a supporting member 7. That is, as shown in FIG. 3, the seal flange 11 is movably provided on the guide member 15 a provided on the base 15 by the U-shaped cross-section members 11 c provided on both sides. The fittings 11a of the seal flange 11 are superposed on a plurality of fittings 7f which are fixedly provided on the outer periphery of the portion 7d at predetermined intervals in the circumferential direction, and these are joined by bolts and nuts (not shown). An annular recess 11b into which the other end of the pipe 2 in the direction of the central axis is fitted in a liquid-tight manner is formed on one end surface of the seal flange 11. Actually, as shown in FIG. 5, the liquid tightness is maintained by inserting the seal member 11d between the inner peripheral surface of the pipe 2 and the one end surface of the seal flange 11. Thus, the first platen 1
Annular recess 1a of the seal and annular recess 11b of the seal flange 11
And are opposed to each other at a predetermined interval. 11e is a semi-annular convex portion formed on the outer peripheral edge of the lower end portion of the annular recess 11b, and has a function of supporting the other end of the pipe 2 and guiding it to the annular recess 11b.

A rotary drive device 13 for rotating the spindle 5 is provided. As shown in detail in FIG. 3, the rotary drive device 13 includes a rotary drive shaft 14 spline-coupled to the other end of the spindle 5, a motor 16 fixed to a base 15 via a support 25, and a motor 16. Device 17 for reducing the rotation of the rotary drive shaft, and a coupling device 19 for connecting the connecting shaft 18 and the rotary drive shaft 14 that are decelerated and rotated by the reducer device 17.
Consists of Reference numeral 20 is a bearing device that rotatably supports the intermediate portion of the rotary drive shaft 14. One end of the rotary drive shaft 14 is fitted into a circular hole 5n in the central axis direction of the spindle 5 and is slidably supported, and an intermediate portion of the annular member 5o is fixed to the other end of the spindle 5. It is splined to the circumference. Reference numeral 14a is a bush that is in close contact with the circular hole 5n, and 14b is a pressing plate that fixes the bush 14a to one end of the rotary drive shaft 14.

When the motor 16 is rotationally driven in the forward and reverse directions, the rotational drive shaft 14 is rotated in the forward and reverse directions through the speed reducer 17, the connecting shaft 18, and the joint device 19, so that the rotational drive shaft 14 and the spline are connected. Spindle 5 rotates. As a result, the spindle 5, which is connected to the second platen 4 and the screw 23, moves back and forth in the axial direction. The limit of the forward / backward movement of the spindle 5 and thus the seal flange 11 in the axial direction is determined by the pair of limit switches 21a and 21b fixed to the bracket 24 of the second platen 4 and the annular member 5.
It is detected by the contact of the protrusion 5p of o, and the rotation drive of the motor 16 is stopped by this detection signal.

Next, the operation of the above embodiment will be described. Initially, the motor 16 is rotationally driven in one direction to return the spindle 5 and thus the seal flange 11 to the other end side. In this state, the pipe 2 is lifted by a crane or the like (not shown) and positioned between the annular recess 1a of the first platen 1 and the annular recess 11b of the seal flange 11 which are opposed to each other, and one end of the pipe 2 is moved to the first position. 1 The platen 1 is fitted into the annular recess 1a in a liquid-tight manner. Next, the motor 16 is rotationally driven in the other direction to move the spindle 5 to one end side, and the other end of the pipe 2 is fitted into the annular recess 11b of the seal flange 11 in a liquid-tight manner. At that time, the shaft member 9 shown in FIG. 4 rotates integrally with the spindle 5, but the support member 7 supported by the shaft member 9 with the pair of bearings 10a and 10b interposed therebetween is non-rotating, and is integrated with the support member 7. The seal flange 11 also does not rotate.

When one end of the pipe 2 abuts on the annular recess 1a of the first platen 1 and the reaction force thereof starts to act on the support member 7 via the seal flange 11, the space between the spindle 5 and the shaft member 9 is increased. The spring 8 inserted in the
As long as the gap δ exists between the support member 7 and the spindle 5, the rotational force is not transmitted to the seal flange 11. When the required clamping force of the first platen 1 and the seal flange 11 acts on the pipe 2, the motor 16 is stopped. At that time, the elastic force of the spring 8 is set so that the gap δ is zero or slight.

When the pipe 2 is held between the first platen 1 and the seal flange 11, a predetermined water pressure from the water pressure source is applied to the inside of the pipe 2 via the high pressure hose 1d, and the pipe 2 is supplied with the predetermined water pressure. Perform the test. Since the gap δ is zero to slight, the amount of movement of the seal flange 11 and the support member 7 in the central axis direction due to the water pressure acting in the pipe 2 can be suppressed to zero to slight. The spindle 5 has a second
Since it is connected to the platen 4 by the irreversible screw 23, it does not move due to water pressure acting in the central axis direction. Therefore, the water pressure test can be performed for a long time without causing water leakage due to the movement of the seal flange 11.

When the water pressure test is completed, the water in the pipe 2 is discharged and the pipe 2 is lifted and supported by a crane or the like. Next, the motor 16 is rotationally driven in one direction to return the spindle 5 and the seal flange 11 to the other end side, and the pipe 2 is removed while ensuring a sufficient space between the seal flange 11 and the first platen 1. In this way, the pipe 2 can be subjected to a hydraulic test one after another.

By the way, when performing a hydraulic test on pipes 2 having different diameters, the first platen 1 having an annular recess 1a that matches the diameter and wall thickness of the pipe 2 and a similar annular recess 11b. Replace with seal flange 11 having. Further, when the water pressure test is performed on the pipe 2 having a short length, an intermediate connecting member (not shown) is interposed between the support member 7 and the seal flange 11.

[0020]

As can be understood from the above description,
According to the holding device of the hydraulic tester for pipes of the present invention, since the reciprocating linear motion by the screw connection is applied to the seal flange to hold the pipe, the pipe is held by a hydraulic cylinder device as compared with the one using the hydraulic cylinder device. As a result, movement due to liquid leakage is unlikely to occur, and the pipe is reliably held during the hydraulic pressure test. As a result, accidents such as jetting of high-pressure water can be prevented in advance. In addition, almost the seal flange
Apply the required clamping force while maintaining the non-rotating state.
Since it can be applied to the seal,
It may rotate with the pipe and frictional force due to the movement may act.
And a seal member that is normally interposed between them.
It is possible to prevent early wear deterioration.

[Brief description of drawings]

FIG. 1 is a front view showing a holding device for a hydraulic tester for pipes according to an embodiment of the present invention, in which a tie rod is partially omitted.

FIG. 2 is a plan view of the same.

FIG. 3 is a front view showing a cross section of the main part of the same.

FIG. 4 is a front view showing a spindle and a supporting member in cross section.

FIG. 5 is a cross-sectional view showing enlarged main parts of the first platen and the seal flange in the same manner.

FIG. 6 is a side view showing an enlarged main part of the first platen and the seal flange in the same manner.

[Explanation of symbols]

1: 1st platen, 1a: annular recess, 1c: seal member, 1d: high pressure hose, 2: pipe, 3: tie rod,
4: second platen, 5: spindle, 5h: recess, 7:
Support member, 8: spring, 9: shaft member, 9a: outward flange portion, 10a, 10b: bearing, 11: seal flange, 11b: annular recess, 11d: seal member, 13:
Rotary drive device, 14: rotary drive shaft, 15: base, 16:
Motor, 17: reducer, 18: connecting shaft, 19: joint device, 20: bearing, 23: screw, δ: gap.

Claims (1)

[Claims] 1. A first platen having an annular recess into which one end of the pipe in the central axis direction is fitted in a liquid-tight manner and provided with a high-pressure hose for applying water pressure to the inside of the pipe; A second platen that is connected to the second platen, a spindle that is screwed to the second platen, a support member that is supported at the end of the spindle on the first platen side so as to be rotatable relative to the central axis, and a support member. The support member is provided with a seal flange that is connected and has an annular recess into which the other end of the pipe in the central axis direction is fitted in a liquid-tight manner and a rotary drive device that rotationally drives the spindle.
Support the spindle on the
The mounted spring urges it toward the first platen.
And a predetermined gap between the support member and the spindle.
A device for holding a hydraulic tester for pipes, which is secured in the state .