JPH0560671A - Holding device for hydraulic tester for pipes - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a holding device for hydraulic testers for pipes. A first platen 1 having an annular recess 1a into which one end of the pipe 2 in the direction of the central axis is fitted in a liquid-tight manner, and a high pressure hose 1d for applying water pressure to the inside of the pipe 2,
A second platen 4 connected to the platen 1 by a tie rod 3, a spindle 5 connected to the second platen 4 with a screw 23, and an end portion of the spindle 5 on the side of the first platen 1 rotatable about a central axis. The support member 7, which is supported by the support member 7, the seal flange 11 which is connected to the support member 7 and has the annular recess 11b into which the other end portion of the pipe 2 in the central axis direction is fitted in a liquid-tight manner, and the spindle 5 is rotationally driven. Rotation drive device 1
3 and 3. [Effect] A reciprocating linear motion due to a screw connection is given to the seal flange to securely hold the pipe. As a result, accidents such as high-pressure water jetting are prevented.

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 in the central axis direction of the pipe 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 tie rod, a cylinder device fixed to the second platen, a cylinder device connected to the cylinder device, and the other end in the central axis direction of the pipe 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 a cylinder device. Since the structure is such that it is pressed and held, it is easy for pressure fluid leakage 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 configuration is an annular shape in which one end portion of the pipe in the direction of the central axis is liquid-tightly inserted. 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 supporting 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 an annular recess that is connected to the supporting member and that fits the other end of the pipe in the central axial direction in a liquid-tight manner. A holding device for a hydraulic tester for pipes, comprising: a seal flange having a position; and a rotary drive device for rotationally driving a spindle. The support member is supported by the spindle so as to be movable in the central axis direction, and is urged toward the first platen by a spring interposed between the support member and the spindle. It is possible to secure a predetermined gap in the normal state.

[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. Insert into the platen's annular recess in a liquid-tight manner.
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 support member supported by the spindle so as to be relatively rotatable around the central axis is non-rotating, and the seal flange connected to the support 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. Therefore, the water pressure test can be performed for a long time 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. If 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, so The spring inserted in the will start to be compressed. Thus, 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 to 6 show an embodiment of a holding device for a 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 portion of the pipe 2 in the central axis direction is fitted in a liquid-tight manner in the central portion. 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 to face the base 15 with respect to the first platen 1, and the both 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,
It is formed with the second step surface 5f and the third step surface 5g 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 in 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. 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.

At one end 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 are formed.
The small diameter portion 7a of the support member 7 is supported so as to be rotatable relative to each other. 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. 7g is a bush, and 7e is a lid that closes one end of the through hole 7b. 5
Reference numeral j denotes a bush which is locked to the third step surface 5g and fitted in 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 in a tight contact. 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 contacts the annular member 5i by the elastic force of the spring 8 and forms a predetermined gap δ with the one end surface of the spindle 5. is 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 arranged 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 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 central axis direction 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 interposing 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.

Then, a rotary drive device 13 for rotationally driving the spindle 5 is provided. As shown in detail in FIG. 3, the rotary drive device 13 includes a rotary drive shaft 14 that is 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. Speed reducer 17 for reducing the speed of rotation, and a coupling device 19 for connecting the connecting shaft 18 and the rotary drive shaft 14 that are decelerated by the reducer 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. It is splined to the circumference. Reference numeral 14a is a bush that comes into contact with the circular hole 5n, and 14b is a restraining 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 connection are formed. Spindle 5 rotates. As a result, the spindle 5 that is connected to the second platen 4 and the screw 23 moves back and forth in the axial direction. The limit of the axial forward / backward movement of the spindle 5 and thus of the seal flange 11 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 projection 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, and the spindle 5 and thus the seal flange 11 is returned 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 the 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 this 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 comes into contact with the annular recess 1a of the first platen 1 and its reaction force begins to act on the support member 7 via the seal flange 11, the space between the spindle 5 and the shaft member 9 is reduced. 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 this 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 through 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 direction of the central axis 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 successively subjected to the hydraulic test.

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 the 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 for the hydraulic tester for pipes of the present invention, since the reciprocating linear motion due to 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 device 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.

[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 sectional view showing an enlarged main part of the first platen and the seal flange.

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

[Explanation of symbols]

1: first 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:
Rotation drive device, 14: rotation drive shaft, 15: base, 16:
Motor, 17: reduction gear, 18: connecting shaft, 19: joint device, 20: bearing, 23: screw, δ: gap.

Claims (2)

[Claims] 1. A first platen having an annular recess into which one end in the direction of the central axis of the pipe 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 center axis, and a support member. Holding of a hydraulic tester for pipes, comprising: a seal flange having an annular recess connected to the other end of the pipe in the direction of the central axis of the pipe in a liquid-tight manner; and a rotary drive device for rotationally driving the spindle. apparatus. 2. 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. The holding device for a hydraulic tester for pipes according to claim 1, wherein a predetermined gap is secured in the normal state.