JP2015059755A - Flange gap measuring jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flange gap measuring jig in which, in measuring a gap of flange junction parts, penetration force for inserting a wedge-type penetration part which serves as a function of a taper gauge into the gap of the flanges and a penetration angle are made constant.SOLUTION: A flange gap measuring jig 100 is provided with a scaled shaft 70 rotatably joined to a wedge type penetration part 60, has a dial 80 which rotates the scaled shaft within a set torque range on the same axis as the scaled shaft 70, and has a gauge base 50 which supports the scaled shaft 70 and contacts with an outer peripheral surface of flanges 20. The gauge base 50 and the scaled shaft 70 are screwed with each other.

Description

  The present invention relates to a flange gap measuring jig, and more particularly, to a flange gap measuring jig that keeps the gauge input constant.

  In power plants, chemical plants, etc., flanges are used for joining pipes, and the number thereof is hundreds to thousands depending on the scale of the plant. At the time of construction or periodic inspection, the flanges are joined, and at that time, it is said that good joining without causing leakage can be performed by tightening the bolts uniformly over the entire circumference of the flange. There are two methods for tightening the bolts evenly: a method of joining while keeping the gap between the flanges constant (gap management) and a method of joining while keeping the bolt tightening torque constant (torque management). It depends on the characteristics of gaskets and packings inserted inside.

The former gap measurement method is simple and generally includes inserting a thin metal piece (leaf) into the gap (using a gap gauge or a thickness gauge) or inserting a wedge-shaped scale into the gap (using a taper gauge). However, since the gauge insertion (penetration) force by the measurer and the gauge application method (penetration angle) vary, an error occurs. For example, a measuring device is installed outside the flange as in Patent Document 1. A method of measuring the tightening allowance (gap) has also been devised.
However, the measuring device disclosed in Patent Document 1 requires time and effort for mounting on the flange, and since a magnet is incorporated into a contact piece (jig) for mounting on the flange and magnetically attracted to the flange made of stainless steel. Is not applicable, and because it is sandwiched with screws from the outside of both flanges to be joined, a force other than the original bolting is applied, so there is a concern that this may be affected particularly when soft packing is used. Is done.

Actual Kaihei 5-40851

  Among the methods for inserting the above gauges, the method using a taper gauge that does not require leaf replacement is the simplest and labor-saving method. It is an object of the present invention to provide a flange gap measuring jig to be used.

In order to solve the above-mentioned problems, a flange gap measuring jig according to the present invention is provided with a scale shaft that is rotatably joined to the penetrating part that feeds out a wedge-shaped penetrating part, and is coaxial with the scale axis. It has a dial that rotates the scale shaft within a set torque range, has a gauge base that supports the scale shaft and contacts the outer peripheral surface of the flange, and is configured to screw the gauge base and the scale shaft together. It is characterized by.
Accordingly, the wedge-shaped penetration portion can be penetrated into the gap between the flanges with a constant force, and the penetration angle and the orientation of the penetration portion can be kept constant, thereby preventing variation in measurement values by the measurer.
Further, the flange gap measuring jig according to the present invention has a plurality of female screws in which the dial is inserted from the circumferential direction toward the center, and has a spring that is coaxially penetrated into the female screws, A rotational torque is transmitted to the scale shaft by a frictional force between the scale shaft and the spring.

As a result, the frictional force at the joint between the dial and the scale shaft can be set by the insertion amount of the grommet screw, and slippage occurs above a certain rotational torque, and the penetration amount of the penetration portion into the gap is limited. Measurement errors can be prevented.
Further, the flange gap measuring jig according to the present invention is provided with a support plate having a concave portion that contacts the outer peripheral surface of the flange at the upper and lower ends of the gauge base, and has a plurality of protrusions, and the outer peripheral surface of the flange A rubber band stretched along the line is fixed to the flange by being hooked on the protrusion.
Thereby, since a flange clearance measuring jig can change an installation place easily by attachment and detachment of a rubber band, it can measure in a short time.

  According to the flange gap measuring jig having the above-mentioned features, it can be easily and quickly installed on the flange to be measured, and the gauge can be penetrated with a constant force regardless of the force of the measurer. Since the angle is also constant, gap measurement with little measurement error is possible.

The bird's-eye view which shows Example 1 of this invention. The fragmentary sectional view of Example 1 of the present invention. Sectional drawing of the dial of this invention. The bird's-eye view which shows Example 2 of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
Example 1
FIG. 1 is a bird's-eye view showing Embodiment 1 of the present invention. The flange 20 for joining the pipes 10 to each other is fastened with bolts 30 and nuts 40 via the packing 25. In order to bolt evenly over the entire circumference of the flange 20, a wedge-shaped penetration portion 60 is provided in the gap. Is performed while measuring the distance between the flanges 20. A scale shaft 70 is rotatably joined to the penetrating portion 60, and a dial 80 is provided coaxially with the scale shaft 70 to rotate the scale shaft 70 within a set torque range. The scale shaft 70 penetrates the gauge base 50, and the scale shaft 70 and the gauge base 50 are configured to be screwed together by a thread groove at the penetrating portion. A scale 75 representing the height H of the penetrating portion 60 is engraved on the scale shaft 70, and the H is obtained by reading the position of the side surface of the dial 80 with the scale 75. Support plates 52 having recesses that come into contact with the outer peripheral surface of the flange 20 are provided at the upper and lower ends of the gauge base 50, and the penetration portions 60 are inserted at right angles to the tangent to the flange 20. Variation in installation angle is reduced.

  FIG. 2 is a partial cross-sectional view of the first embodiment of the present invention. A location where the scale shaft 70 penetrates the gauge base 50 is configured to be screwed by a male screw 76 and a female screw 77. The scale shaft 70 is rotatably joined to the penetration portion 60 by a joint 78. As described above, the gap H between the flanges 20 can be obtained by reading the position of the side surface of the dial 80 with the scale 75. In addition, if it replaces with the structure of the external thread 76 and the internal thread 77, and it is set as the structure by a ball screw and a nut, the screwing which the scale shaft 70 rotates more smoothly can be performed.

FIG. 3 is a sectional view of the dial of the present invention. The dial 80 has an inner ring 85 inside the outer ring 84, and a scale shaft 75 passes through the inner ring 85. The outer ring 84 and the inner ring 85 are fitted with thread screws 81 at intervals of 90 °, the thread screws 81 pass through the spring 83, and the plain screws 82 fasten the thread screws 81 and the spring 83. The tip of the spring 83 and the scale shaft 75 are in contact and coupled. When a rotational torque exceeding the frictional force between the scale shaft 75 and the spring 83 is applied to the dial 80, the dial 80 idles, and as a result, a rotational torque exceeding a certain level is not applied to the scale shaft 75. Variations in measured values by the measurer can be prevented.
In addition to the above configuration, as a means for making the rotational torque to the graduation shaft 70 constant, for example, a strain gauge is provided at the contact portion between the dial 80 and the graduation shaft 70, and through input is performed while measuring the stress applied thereto. May be adjusted.

(Example 2)
FIG. 4 is a bird's eye view showing Embodiment 2 of the present invention. A plurality of protrusions 51 are provided on the upper and lower portions of the gauge base 50, and a rubber band 86 or a rubber ring is stretched along the outer peripheral surface of the flange 20 and latched on the protrusions 51. Thereby, the recessed part of the support plate 52 contact | abuts exactly to the outer peripheral surface of the flange 20, and the installation angle of a jig | tool becomes fixed. By removing the rubber band 86 or the rubber ring, it is possible to easily change the setting of the flange gap measuring jig and to stabilize the mounting posture to the flange 20.

10 ......... Piping, 20 ......... Flange, 25 ......... Packing, 30 ......... Bolt, 40 ......... Nut, 50 ......... Gauge base, 51 ...... Protrusion, 52 ......... Support plate 60 ......... Intrusion, 70 ......... Scale shaft, 75 ......... Scale, 76 ......... Male thread, 77 ...... Female thread, 78 ......... Joint, 80 ......... Dial, 81 ... ... female screw, 82 ... ... plain washer, 83 ... ... spring, 84 ... ... outer ring, 85 ... ... inner ring, 86 ... ... rubber band, 100 ... ... gap measuring jig.

Claims (3)

A measuring jig for measuring the gap between the flange joints, which is provided with a scale shaft that is rotatably joined to the penetration part that feeds out the wedge-shaped penetration part, and the scale axis is set coaxially with the scale axis It has a dial that rotates in a torque range, has a gauge base that supports the scale shaft and abuts on the outer peripheral surface of the flange, and is configured to screw the gauge base and the scale shaft. A flange gap measuring jig. The dial has a plurality of male screws fitted from the circumferential direction of the dial toward the center, and has a spring coaxially inserted in the female screw, and the friction force between the scale shaft and the spring The flange clearance measuring jig according to claim 1, wherein rotational torque is transmitted to the scale shaft. A plurality of protrusions are provided on the gauge base, and support plates having recesses that contact the outer peripheral surface of the flange are provided at the upper and lower ends of the gauge base, and a plurality of protrusions are provided along the outer peripheral surface of the flange. The flange gap measuring jig according to claim 1, wherein a rubber band stretched by being hooked is fixed to the flange by being hooked on the protruding portion.

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