CN103486941A - Casing pipe end sealing face inner diameter measuring device - Google Patents

Abstract

The invention discloses a casing pipe end sealing face inner diameter measuring device. The measuring device comprises a dial indicator, backup plates and measuring contacts. A locking bolt is arranged on the dial indicator, a movable rod is arranged at one end of the dial indicator, a locating mechanism is arranged at the other end of the dial indicator, the two backup plates are arranged on the movable rod and the locating mechanism respectively, and the two measuring contacts are arranged on the end portion of the movable rod and the end portion of the locating mechanism respectively. The measurement range can be adjusted conveniently with the measuring device so that a gauge can be used for measuring products in different specification ranges, the number of the equipped gauges is favorable for being reduced, production cost is saved, repeatability is high, and the measuring device is suitable for precision measurement of the inner diameter of the sealing face of the pipe end of a special casing pipe which is high in precision requirement and within the tolerance range.

Description

A device for measuring the inner diameter of the sealing surface of the casing pipe end

technical field

The invention relates to gauges, more specifically, to a device for measuring the inner diameter of the sealing surface of the casing pipe end.

Background technique

With the continuous improvement of oil and gas fields' requirements for various types of oil pipelines, special casings with high added value are gradually gaining favor in the market, but these products have high precision and are difficult to process. Especially for special casing female joints, the inner diameter of the sealing surface of the pipe end is the main part to ensure the sealing of the product. The inner diameter control is particularly important, but it is difficult to measure due to the position of the pipe end and the sealing surface. Fig. 1 is a cross-sectional view of a special casing female joint. The female joint pipe end of a special casing 100 mainly includes a circular arc surface section 101, a sealing surface section 102 and an inclined surface section 103, wherein the length from the inclined surface section 103 to the arc surface section 101 is L1, the length L2 of the sealing surface segment, and the intersection point of the inclined surface segment 103 and the arc surface segment 101 has a circular arc with a radius R. In order to ensure that the oil casing male joint and the special casing female joint are in close contact after screwing together to achieve an interference fit and play the role of auxiliary sealing, the inner diameter of the sealing surface section 102 must be strictly controlled, but due to the small length range of the length L1 , the dimensional tolerance of the inner diameter of the sealing surface is small, and there is a high requirement on the ovality, which results in the inability of common measuring instruments to accurately measure the inner diameter and ovality of the sealing surface 102 .

At present, the measurement of the inner diameter of the sealing surface of the special casing pipe end with sealing effect can generally be measured with a three-point inner diameter micrometer or inner diameter micrometer. There are three shortcomings: First, the three-point inner diameter micrometer or inner diameter micrometer cannot be realized The 360-degree rotation measurement cannot accurately find the maximum and minimum values of the inner diameter of the sealing surface; secondly, when the three-point inner diameter micrometer or inner diameter micrometer inspects such products, because there is no reference for measurement, it is easy to cause the probes on both sides to tilt up and down. The measurement results that cause gross errors or even errors cannot meet the inner diameter requirements of the special casing sealing surface with extremely high precision requirements; finally, none of the above-mentioned general-purpose inner diameter measuring tools can accurately measure the ellipticity of the sealing surface position of the pipe end.

Contents of the invention

In view of the above-mentioned shortcomings existing in the prior art, the object of the present invention is to provide a casing pipe end sealing surface inner diameter measuring device, which can conveniently and accurately measure the processing deviation and ellipticity of the inner diameter of the special casing pipe end sealing surface.

To achieve the above object, the present invention adopts the following technical solutions:

The device for measuring the inner diameter of the sealing surface of the casing pipe end includes a dial indicator, a backing plate, and a measuring contact. A backing plate is respectively arranged on the movable rod and the positioning mechanism, and two measuring contacts are respectively arranged on the ends of the movable rod and the positioning mechanism.

The positioning mechanism includes an arc-shaped fixed block, a connecting rod and a conversion rod. The fixed block is fixed to the dial indicator. One end of the connecting rod is connected with the fixed block, and the other end is connected with the conversion rod. at the end of the transition rod.

The one backing plate is fixed on the conversion rod through a circular clamp; the other backing plate is installed on an upper pressing plate, and is clamped on the movable bar by being clamped with the lower pressing plate.

A dial is also arranged on the movable rod.

The dial gauge is also provided with bolts for locking the rotary dial.

In the above technical solution, the device for measuring the inner diameter of the sealing surface of the casing pipe end of the present invention includes a dial indicator, a backing plate, and a measuring contact. The dial indicator is provided with a locking bolt, and one end of the dial indicator is provided with a movable rod. The other end is provided with a positioning mechanism, two backing plates are respectively arranged on the movable rod and the positioning mechanism, and two measuring contacts are respectively arranged on the ends of the movable rod and the positioning mechanism. The measuring device can be used to adjust the measuring range conveniently, so that one gauge can measure products of different specifications, which helps to reduce the equipment of this type of gauge, save production costs, and has high repeatability, which is suitable for precision requirements. Precision measurement of the inner diameter of the sealing surface of the special casing pipe end under the high and tolerance range.

Description of drawings

Fig. 1 is the sectional view of existing special bushing female joint;

Fig. 2 is the structural representation of measuring device of the present invention;

Fig. 3 is the top view of measuring device among Fig. 2;

Fig. 4 is a schematic diagram of the use state of the measuring device of the present invention.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 to 3, the inventive device for measuring the inner diameter of the sealing surface of the casing pipe end includes a dial indicator 1, a backing plate 2, and a measuring contact 3, wherein the dial indicator 1 has a rotating dial on its surface 4. One end of the dial indicator 1 is provided with a movable rod 5, which is linked with the pointer in the table, and the other end is provided with a positioning mechanism 6. Two backing plates 2 are respectively arranged on the movable rod 5 and the positioning mechanism 6. The two measuring contacts The head 3 is separately arranged at the ends of the movable rod 5 and the positioning mechanism 6 . The specific structure is as follows: the positioning mechanism 6 includes an arc-shaped fixed block 7, connecting rod 8 and conversion rod 9, the fixed block is fixed with the dial indicator 1, one end of the connecting rod 8 is connected with the fixed block 7 by threads, and the other end It is also connected with the conversion rod 9 through threads, and the connecting rod 8 can be configured with multiple lengths according to different casing sizes to be measured, such as 10mm, 25mm, 50mm, etc., to be extended, so that the maximum measurement range of the entire measuring device reaches 100 ~ 500mm, to meet the measurement requirements of casings of different specifications. And the effect of conversion rod 9 is to be used for installing the measurement contact 3 of this side and back plate 2, and this side measurement contact 3 is fixed on the end of conversion rod 9 by screw thread as fixed measurement contact 3, and this side Backing plate 2 is fixed on the conversion rod 9 by circular clamp 14, and backing plate 2 on the other side is then installed on an upper pressing plate 10 by screws, and is clamped on the movable bar 5 by cooperating with lower pressing plate 11 again. The movable rod 5 is also provided with a toggle plate 12 for actuating the expansion and contraction of the movable rod 5 , and the dial indicator 1 is also provided with a bolt 13 for locking the rotary dial 4 .

Please refer to Figure 4, the working principle of the measuring device is as follows:

First, according to the size of the inner diameter of the tube end of the special casing 100 to be tested, select the connecting rod 8 of the corresponding length to assemble; secondly, hold the measuring device and compress the dial with your fingers to retract the movable rod 5, and at the same time place the measuring device on the In a standard calibration ring, and make both sides of the support plate 2 erected on the upper end surface of the calibration ring, at this time loosen the dial, so that the movable rod 5 is stretched out so that the measuring contacts 3 on both sides are against the inner wall of the calibration ring, and the After the measuring device rotates 360 degrees in the standard ring, find the maximum and minimum swing points of the pointer, then loosen the locking bolt 13, and rotate the rotary dial 4 so that its zero position is aligned with the pointer; after completing the zero calibration, Place the measuring device on the pipe end of the special bushing 100 to be tested according to the same method as the above-mentioned calibration, make the two backing plates 2 close to the pipe end, and then slightly swing and rotate the measuring device so that it is on the pipe section The inner wall can rotate 360 degrees, and the maximum deviation value of the inner diameter of the sealing surface of the pipe end under test can be read directly on the dial gauge 1, and the ellipticity value can be obtained by subtracting the minimum deviation value from the maximum deviation value.

Using the measuring device of the present invention has the following advantages:

1. The measurement range is large. With the standard calibration ring as a reference, the measurement range can be adjusted conveniently by installing connecting rods 8 of different lengths, so that only one gauge can be used to measure products of different specifications, which helps to reduce the number of such measuring tools. Equipped with the amount, saving production costs.

2. The measurement accuracy is within 0.01mm, with high repeatability, and is suitable for measuring the inner diameter of the sealing surface of the special casing pipe end with high precision requirements and tolerance range.

3. It is small in size and light in weight, and is easy to calibrate and detect on site. If the leaning plate 2 has measurement errors due to wear and tear, it can be easily removed and replaced.

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than as a limitation to the present invention, as long as within the scope of the spirit of the present invention, the above-described embodiments Changes and modifications will fall within the scope of the claims of the present invention.

Claims (5)

1. a sleeve pipe pipe end sealing surface inner diameter measuring device is characterized in that:

Comprise dial gauge, backup plate, measurement contact, have a rotation scale on dial gauge, and dial gauge one end is provided with motion bar, the other end is provided with detent mechanism, two backup plates are located at respectively on motion bar and detent mechanism, measure the end that contact is divided into motion bar and detent mechanism for two.

2. sleeve pipe pipe end sealing surface inner diameter measuring device as claimed in claim 1 is characterized in that:

Described detent mechanism comprises arc fixed block, connecting link and selector bar, and fixed block and dial gauge fix, and connecting link one end is connected with fixed block, and the other end is connected with selector bar, and described one measures the end that contact is fixedly arranged on selector bar.

3. sleeve pipe pipe end sealing surface inner diameter measuring device as claimed in claim 1 is characterized in that:

A described backup plate is fixed on selector bar by circular clamp; Described another backup plate is arranged on a top board, and by being clamped on motion bar with lower platen.

4. sleeve pipe pipe end sealing surface inner diameter measuring device as claimed in claim 1 is characterized in that:

Also be provided with plate on described motion bar.

5. sleeve pipe pipe end sealing surface inner diameter measuring device as claimed in claim 1 is characterized in that:

Also be provided with to lock the bolt of rotation scale on described dial gauge.

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