RU2661071C1 - Device for measuring the cylindrical pipe - Google Patents

Abstract

FIELD: measuring equipment.

SUBSTANCE: invention relates to a measuring device for measuring cylindrical pipes used in chemical and similar plants. Measuring device for measuring the cylindrical pipe is designed in such a way that it is possible to fold with each other its parts and immobilize it with respect to the outer circumference of reaction tube (11); and the measuring device comprises: left upper plate (21a) and right upper plate (21b), each of which is provided with a notch; connecting member (23) for connecting these upper plates on the outer circumference of reaction tube (11); and holding member (28) for holding the opening portion comprising left upper plate (21a) and right upper plate (21b) that can be opened and closed.

EFFECT: creation of a device for measuring a cylindrical tube in a simple way with high accuracy.

5 cl, 8 dwg

Description

The technical field of the invention

The present invention relates to a measuring device for measuring cylindrical pipes used in chemical and similar enterprises.

BACKGROUND OF THE INVENTION

Typically, chemical plants use pipes that can withstand high temperatures, where they are exposed to internal pressure in a high-temperature environment in such a way that a special deformation, called "creep deformation," develops. With the development of such creeping deformation, a phenomenon can occur in which a part of the pipe expands in the diametrical direction, which leads to its damage.

To prevent such damage, various methods for predicting the service life have been developed. For example, there is a method according to which the phenomenon of creep development is restrained, based on the determination of the expansion of the diameter of the pipe, and the term of its possible operation is predicted. However, it is very difficult to accurately measure the diameter of the pipe used in a factory or similar enterprise.

On the other hand, with respect to such creep damage, there is also a simplified method for predicting the useful life without the need to measure the diameter of the pipe.

For example, according to Patent Document 1 (Japanese Patent Application Laid-Open No. 2003-232719), damage due to creep of a pipe used in a boiler furnace can be predicted by determining the amount of creeping deformation before and after the pipe deformation at a plurality of points of the bent portion of the pipe by using a strain gauge or a similar device and the subsequent calculation of the bending moment based on this strain value. This eliminates the need for accurate measurement of the diameter of the pipe. Using this method, it is possible, however, to predict the magnitude of the deformation of the entire bent portion of the pipe from the magnitude of the deformation of the portion of the bent portion in such a way that this can lead to a decrease in the accuracy of the forecast. In addition, when using this method, the amount of deformation of the entire pipe, with the exception of the bent part, is not really measured, but calculations based on the amount of deformation in the bent part are performed. Thus, this can also lead to a decrease in the accuracy of the forecast in comparison with the case when the strain value of the diameter of the entire pipe is actually measured.

According to Patent Document 2 (Japanese Patent Application Laid-Open No. H09-159582), there is a calculation method according to which instead of the values of the inner diameter and the outer diameter of the pipe before deformation, the values of the inner diameter and the outer diameter of the pipe in the part that is not exposed to relatively high temperature are used (i.e. in the cold end part), as parameters of the pipe after deformation. In this case, the expansion value is determined by calculating the difference between the inner and outer diameters after deformation, actually measured in different parts of the pipe, and the inner and outer diameters in the cold end part, and the life expectancy before the pipe is damaged. Thus, the possibility of fluctuations in the accuracy of the measurement can be reduced by eliminating measurements of the inner and outer diameters before the pipe deforms. However, even when using this method, the prediction accuracy tends to be low in comparison with the case when the strain value of the diameter of the entire pipe is actually measured.

List of Patent Reference Documents

Patent Document 1 - Japanese Patent Application Laid-Open No. 2003-232719

Patent Document 2: - Japanese Patent Application Laid-Open No. H09-159582

SUMMARY OF THE INVENTION

Problem to be Solved by the Invention

Considering the state of affairs in the art described above, it is an object of the present invention to provide a device for measuring a cylindrical pipe in a simple manner with high accuracy.

Means for solving the problem

To achieve the above goal, a device for measuring a cylindrical pipe according to the present invention is created, comprising: at least one pair of fastened elements, each of which contains an inner surface provided with a cutout for folding them together and immobilizing relative to the outer circumference of the cylindrical pipe from both sides relative to the diameter perpendicular to the direction of diameter measurement; a first holding member for connecting the fastened members to the outer circumference of the cylindrical pipe; and a second holding member for holding the disclosed portion for the fastened members so that they can be opened and closed; where at least a portion of each fastened element forms a plane perpendicular to the axial direction of the cylindrical pipe.

Each fixed element may be provided with a support part for supporting an ultrasonic device for measuring a thickness in contact with the outer circumference of the cylindrical pipe on a line extending in the direction of measurement of the cylindrical pipe.

The elastic element may be located on the inner surface of each fixed element.

A device for measuring a cylindrical pipe may include an upper plate configured to rotate in the circumferential direction of the cylindrical pipe.

Each fixed element may be provided with a supporting part for supporting a non-contact type device for measuring the outer diameter on a line extending in the direction of measurement of the cylindrical pipe.

The technical result of the invention

Using the apparatus for measuring a cylindrical pipe according to the present invention, the shape of the pipe can be accurately measured using a simple mechanism, as a result of which the prediction of the life of the pipe can be realized with high accuracy.

Brief Description of the Drawings

In FIG. 1 is a diagram of a reforming installation on which a device for measuring a cylindrical pipe according to the present invention is arranged;

in FIG. 2 is a schematic top view of a first embodiment of a device for measuring a cylindrical pipe according to the present invention, which shows the relative position when performing measurements on the reaction pipe;

in FIG. 3 is a schematic front view of a first embodiment of a device for measuring a cylindrical pipe according to the present invention, which shows the relative position when measuring on a reaction pipe;

in FIG. 4 is a schematic top view of a second embodiment of a device for measuring a cylindrical pipe according to the present invention, which shows the relative position when performing measurements on the reaction pipe;

in FIG. 5 is a schematic side view of a second embodiment of a device for measuring a cylindrical pipe according to the present invention, which shows the relative position when measuring on a reaction pipe;

in FIG. 6 is a section A-A in FIG. 5 of a second embodiment of a device for measuring a cylindrical pipe according to the present invention, which shows the relative position when measuring on a reaction pipe;

in FIG. 7 is a schematic top view of a third embodiment of a device for measuring a cylindrical pipe according to the present invention, which shows the relative position when performing measurements on the reaction pipe;

in FIG. 8 is a front view of a third embodiment of a device for measuring a cylindrical pipe according to the present invention, which shows the relative position when measuring on a reaction pipe;

The method of carrying out the invention

The following describes embodiments of a device for measuring a cylindrical pipe (hereinafter also referred to as a "measuring device") according to the present invention with reference to the accompanying drawings.

In FIG. 1 shows a reformer, the dimensions of which are measured using the measuring device described below. In FIG. 1 is a schematic view, in particular, a reforming unit 1 used among other pipes in chemical and similar plants.

The reforming unit 1 described herein is a device into which a mixture of gases (e.g., water vapor, methane, etc.) is supplied and the mixture of gases is converted by heating and applying pressure, whereby a gas having other properties is generated (e.g. hydrogen, steam, carbon monoxide, carbon dioxide, etc.).

As shown in FIG. 1, the pipe of the reformer is positioned so that its axial direction extends vertically and is introduced into the high temperature furnace and maintains high pressure therein at a natural gas processing plant or the like. The upper part of the reaction tube 11 is connected to a pipe for supplying natural gas (not shown), and the lower part of the reaction tube 11 is tapered so that its inner diameter and outer diameter are gradually reduced. The reaction tube, with the exception of its upper and lower parts, has a cylindrical shape with a relatively identical size of the inner diameter and relatively the same size of the outer diameter.

The gas generated in the reaction tube 11 enters a pipe (not shown) located at the bottom of the reaction tube 11. The reaction tube 11 is heated externally in a furnace to a temperature of about 1000 ° C.

In the following description, it is assumed that the reaction tube 11 is a cylindrical tube, which is measured using a measuring device according to the present invention. The following describes the case in which the measuring device is located in the region of the cylindrical part of the reaction tube 11, where the inner diameter and outer diameter are, for example, relatively the same. In further embodiments, examples of the use of the measuring device for measuring the reaction tube 11 are provided. However, the use of the measuring device according to the present invention is not limited to the measurement of the reaction tube 11. It can also be used to measure other pipes that are part of the reforming unit 1. In addition, the use of the measuring device according to the present invention is not limited only to the measurement of the components that are part of the installation for reef rminga 1; it can also be used to measure various other cylindrical pipes and, therefore, cylindrical objects other than pipes.

First Embodiment

First, a measuring device according to a first embodiment is described with reference to FIG. 2 and 3.

As shown in FIG. 2, in the first embodiment, the measuring device 2 is used, mounted externally around the reaction tube 11. The measurement direction X of the reaction tube 11 is the direction of its diameter, which extends horizontally across the width. The initial direction Y is the direction of the diameter of the pipe, which is perpendicular to the direction of measurement X. The measuring device 2 contains a pair of fastened elements placed one against the other around the reaction pipe 11 on the right and left sides symmetrically with respect to this initial direction Y. As shown in FIG. 3, a pair of fasteners consists of a left fastener 22a and a right fastener 22b.

In addition, a connecting element 23 was used as the first holding element for connecting these fastened elements 22a and 22b on the outer circumferential surface of the reaction tube 11. As shown in FIG. 2, the holding member 28 is used as the second holding member in the released portion between the fixed members 22a and 22b. As shown in FIG. 3, this holding member 28 is formed from at least the lower members 25a and 25b and the latches 27a-27c. The holding element 28 is configured to open and close the released part. Thus, the measuring device 2 has a structure that is removably attached to the reaction tube 11 from both sides.

The left fastening member 22a is formed of at least a left upper plate 21a and a left member 29a. Similarly, the right pivotable element 22b is also formed of at least the right upper plate 21b and the right element 29b.

The left upper plate 21b and the right upper plate 21b (each) are made of a relatively thin plate. The upper front surface of the left upper plate 21a and the upper right plate 21b form a plane perpendicular to the axial direction of the reaction tube 11.

As shown in FIG. 2, the inner side of the left upper plate 21a and the upper right plate 21b, located closer to the reaction tube 11, contain a V-shaped notch. The inner corner of the V-shaped notch forms an obtuse angle of 140 °. The two sides forming this angle are in contact with the outer circumference of the reaction tube 11, in general, at least at four points, i.e. at two points with each (left and right) of the upper side plates. Thus, the left upper plate 21a and the right upper plate 21b can be attached to the reaction tube 11 to form a plurality of contact points.

Furthermore, as shown in FIG. 3, there is a left element 29a and a right element 29b on the lower sides of the left upper plate 21a and the right upper plate 21b. The left element 29a and the right element 29b are designed so that each of their inner surfaces, located closer to the reaction tube 11, contains a V-shaped cut in coplanar relationship with the cut either in the left upper plate 21a or in the upper right plate 21b. In other words, in a front view in FIG. 2, the left element 29a and the right element 29b are also attached to the outer circumference of the reaction tube, in general, at least at four points, i.e. at two points on each side, as well as the left upper plate 21 and the right upper plate 21b.

Furthermore, as shown in FIG. 3, the left element 29a and the right element 29b are configured to have a certain length along the axial direction of the reaction tube 11. Thus, the left element 29a and the right element 29b can also be stably attached to the reaction tube 11 in the same way as left upper plate 21a and right upper plate 21b.

Furthermore, as shown in FIG. 3, the upper front surface of the left element 29a is connected to the lower front surface of the left upper plate 21a, and the upper front surface of the right element 29b is connected to the lower front surface of the right upper plate 21b. In the first embodiment, fillet welding is used to provide a strong connection so that each bonded surface is not inclined. Especially, the left element 29a and the right element 29b are connected so that their inner surfaces closer to the reaction tube 11 are perpendicular to the upper face surfaces of the left upper plate 21a and the right upper plate 21b, respectively. This makes it possible for the upper front surfaces of the left upper plate 21a and the right upper plate 21b to reliably provide planes perpendicular to the axial direction of the reaction tube 11.

In addition, the aforementioned connecting element 23 is mounted above the reaction tube 11, as shown in FIG. 2. The lateral opposite edges of the inner surface of the connecting element 23 are respectively connected to the inner surfaces of the left element 29a and the right element 29b with hinges 61a and 61b with the possibility of rotation. In a state in which the reaction tube 11 is enclosed on the right and left sides by the left upper plate 21a, and the right upper plate 21b, and the left element 29a, and the right element 29b, a gap is formed between the connecting element 23 and the reaction pipe 11, as a result of which they Do not touch each other.

In addition, a pair of lower elements 25a and 25b is located under the reaction tube 11, as shown in FIG. 2. The left edge of the lower element 25a is connected to the left element 29a by a hinge 61c, and the right edge of the lower element 25b is connected to the right element 29b by a hinge 61d. By means of these hinges 61a-61d, it is possible to rotate the internal elements located closer to the reaction tube 11 of the corresponding elements. Accordingly, these elements have a structure due to which they can be independently opened and closed.

In a state in which the reaction tube 11 is enclosed on the right and left sides by the left upper plate 21a, and the right upper plate 21b, and the left element 29a, and the right element 29b, a gap similarly forms between the lower elements 25a and 25b and the reaction pipe 11 as in the case of the connecting element 23. Thus, the lower elements 25a and 25b, and the reaction tube 11 are not in contact with each other. As shown in FIG. 3, lightening openings 26a and 26b may be formed in the lower elements 25a and 25b, but external peripheral regions satisfying the minimum strength requirements are left. Thus, the weight of the measuring device 2 can be reduced.

As shown in FIG. 3, the latches 27a-27c are located between the lower elements 25a and 25b in three places along the axial direction of the reaction tube 11. In the first embodiment, the latches 27a-27c are spring-type latches having a switch-off adjustment function. The measuring device 2 can be tightened and secured to the reaction tube 11 by connecting the lower elements 25a and 25b located on the left and right sides, as shown in FIG. 3. This makes it possible to prevent a change in the position and direction of the measuring device 2 for measuring the cylindrical pipe, despite changes in the outer diameter of the reaction pipe 11 due to its expansion.

Furthermore, as shown in FIG. 2, a relatively thin rubber plate 63 may be glued to each of the connecting elements 23, the lower elements 25a and 25b, the left upper plate 21a, the right upper plate 21b, the left element 29a and the right element 29b in the area to be contacted with the reaction the pipe 11. This makes it possible to increase the frictional force between the measuring device 2 and the reaction pipe 11 so that a reliable connection can be ensured. As a result of this, slipping of the measuring device 2 attached to the cylindrical tube during the measurement of the reaction tube 11 can be prevented, and thus the displacement of the position, direction and the like in which the measurement is carried out can be prevented.

As described above, the connecting element 23, the left element 29a, the right element 29b and the lower elements 25a and 25b are connected by hinges 61a-61c so that the angles between them can be adjusted accordingly. In addition, upon releasing the latches 27a-27c, the disclosed portion of the measuring device 2 is opened, after which the measuring device 2 may be deformed. Thus, when installing the measuring device 2 on the reaction tube 11 or removing it from the reaction tube 11, even in a small space in which the row of pipes is tightly located, it is possible to relatively easily install and remove the measuring device 2.

The following describes a method for measuring the outer diameter of a reaction tube 11 by using a measuring device 2 according to a first embodiment.

As shown in FIG. 2, a measuring device 2 for measuring a cylindrical pipe 2 is mounted around the reaction pipe 11, tightened and secured thereto by means of latches 27a-27c. In this state, as shown in FIG. 3, the left upper plate 21a and the right upper plate 21b (each) form a plane perpendicular to the axial direction of the reaction tube 11. Then, as shown in FIG. 2, a contact type measuring device 4 is arranged on the left and right upper plates 21a and 21b and the outer diameter of the reaction tube 11 is measured, whereby the outer diameter can be measured in a direction perpendicular to the axial direction of the reaction tube 11. In the first embodiment, as the measuring devices 4 use a caliper.

Typically, when measuring a size performed using only a caliper and without using a measuring device 2, it is difficult to measure the outer diameter in a plane perpendicular to the axial direction of the reaction tube 11. In contrast, when using a measuring device 2 according to the first embodiment, to ensure correct measurements, it is easy to maintain a plane perpendicular to the axial direction of the reaction tube 11. As a result, the measurement error is usually about only ± 1.5%, while when using the measuring device 2 according to the first embodiment of the invention, the measurement error can be reduced to about ± 0.3%.

The cutouts in the upper left plate 21a and in the upper right plate 21b are for stable attachment of the measuring device 2 to the cylindrical reaction tube 11. Thus, in order to achieve this goal with this shape, the cut angle does not have to be obtuse and equal to 140 °. In addition to the V-shape, the notch may also have, for example, some polygonal shape or curvilinear shape, for example, an arched shape. In the first embodiment, although each upper plate is formed of a plate-like element, the upper plate can be made thinner if this provides a certain degree of stiffness. It can also be made thicker, for example, can be made in the form of a block.

In the first embodiment, the left upper plate 21a and the right upper plate 21b are attached to the left element 29a and to the right element 29b by fillet welding, respectively. In addition to welding, they can be bolted or bonded, or they can be prefabricated as a unit.

Similarly, as in the case of the lower elements 25a and 25b, the connecting element 23 must have a certain degree of rigidity in the state in which the device 2 for measuring the cylindrical pipe is attached to the reaction pipe 11, and material can be selected from the connecting element in such a way so that only a minimum of the required parts remains, in terms of ensuring strength.

In the first embodiment, hinges 61a-61c are used to connect the respective elements. However, provided that the respective elements can be connected so that they can be opened and closed, not only hinges, but also any other connecting means can be used. In addition, four hinges 61a-61c need not be used. This design can also be performed in such a way that a small number of elements are connected by hinges, and other elements are fixed so that they cannot be opened and closed.

The latches 27a-27c for fastening the lower elements 25a and 25b are designed to attach the device 2 for measuring the cylindrical pipe to the reaction pipe 11. Thus, their number is not limited to three pieces, and their number can be increased or decreased, depending on the situation. In addition, since the method can be used for securing, with the possibility of removal, regardless of the gap between the lower elements 25a and 25b, it is not necessary to use a spring-type lock with an adjustment function. For example, the following can be used: a method according to which an elastic element, for example rubber, is laid in width for attaching the lower elements, or a method according to which a cord is laid in width to use or screws are used to hold the lower elements.

In addition, in the first embodiment, the rubber plate 63 is adhered to the entire surface of the inner wall. However, it is also possible to glue the rubber plate 63 only to the part that is brought into contact with the reaction tube 11. The purpose of attaching the rubber plate 63 is to increase the friction forces. Thus, in addition to the rubber plate 63 mentioned here, it is possible to use an elastic material, for example a polymer having a high friction force, which can replace the rubber. In addition, this material can be replaced by surface treatment or coating to increase the friction force on the left upper plate 21a, the right upper plate 21b, the left element 29a and the right element 29b into parts to be brought into contact with the reaction tube 11. In addition , you can not use the element to increase the friction force; you can also use, for example, a mounting method, according to which you can arrange a magnet or similar means for using its magnetic force; mounting method, according to which the screw is tightened, etc.

The following is the dimensional order of the measuring device 2 of the first embodiment. Firstly, the reaction tube 11, on which the measuring device 2 is placed, has an outer diameter of about 135 mm and an inner diameter of about 115 mm. The left upper plate 21a and the right upper plate 21b have (each), as shown in FIG. 2, a height of about 146 mm, a width of about 50 mm and a thickness of about 5 mm. The left element 29a and the right element 29b have (each) an axial length of about 100 mm. The connecting element 23 to which these elements are connected has a plate shape, as shown in FIG. 2, having a width of 95 mm, a height of 5 mm and a depth of 100 mm. The lower elements 25a and 25b (each) are in the form of a plate, as shown in FIG. 2, having a width of 42.5 mm, a height of 5 mm and a depth of 100 mm.

The dimensions listed above are provided by way of example only to the measuring device 2 according to the first embodiment, but the present invention is not limited to these sizes. For example, although it is mentioned that the axial length of the left element 29a and the right element 29b is 100 mm, it can be at least about 50 mm. Given the convenience of measurement, it is desirable that this size is about 200 mm or less.

Second Embodiment

A second embodiment is described with reference to FIG. 4-6. Since the second embodiment is a modification of the first embodiment (see FIGS. 2 and 3), the same reference numbers indicate parts similar or similar to those used in the first embodiment, and a repeated description thereof may be omitted.

As shown in FIG. 4, in the second embodiment, the sensors 51a and 51b are sampled in the left and right upper panels 21a and 21b, respectively. These sensors 51a and 51b are arranged along the diameter in the direction of measurement X. The sensors 51a and 51b are arranged so that they are brought into contact with the outer surface of the peripheral wall of the reaction tube 11.

Sensors 51a and 51b (each) comprise a transmitting portion (not shown) for emitting ultrasonic waves in the direction of the reaction tube 11 near the contact portion described above. Each sensor also contains a receiving part (not shown) for receiving ultrasonic waves reflected by the inner circumferential surface of the wall of the reaction tube 11. Thus, the transmitting part transmits ultrasonic waves, the receiving part receives reflected ultrasonic waves, and the time elapsed between these events is calculated. as a result, the thickness of the reaction tube 11 can be determined.

Furthermore, as shown in FIG. 5, the center of the measuring portion of the sensor 51 is positioned so that it lies in the same plane with the upper face of the upper right plate 21b so that the sensor 51b is in contact with the reaction tube in the same measurement position in which the caliper 4 was brought into contact. Similarly, on the back side of FIG. 5, the center of the measuring portion of the sensor 51a is positioned so that it lies in the same plane with the upper face of the upper left plate 21a.

As shown in FIG. 6, the sensors 51a and 51b are pressed against the reaction tube 11 by means of stops 53a and 53b, respectively. Accordingly, no gap is formed between the sensors 51a and 51b and the reaction tube 11. Thus, the wall thickness of the reaction tube can be accurately measured. The stops 53a and 53b are pressed against the reaction tube 11 by means of the forces of the springs 57a and 57b attached to the left element 29a and the right element 29b, respectively. Therefore, by pulling the stops 53a and 53b and compressing the springs 57a and 57b, the sensors 51a and 51b can be removed. Thus, the sensors 51a and 51b can be removed when the outer diameter is measured using a caliper 4.

The following describes a method for measuring the inner diameter of the reaction tube 11 using the apparatus 2b for measuring a cylindrical tube in the second embodiment. In the second embodiment, as in the first embodiment described above, the size of the outer diameter of the reaction tube 11 in the measurement direction X can be precisely determined using a caliper 4. In addition, the wall thickness of the reaction tube 11 can be measured in the same position measurement by removing caliper 4 and installing sensors 51a and 51b to measure wall thickness. The inner diameter of the reaction tube 11 can be accurately calculated by subtracting the wall thickness from the size of the outer diameter, which was measured as described above.

According to this method, for example, even when the oxidation / decrease in thickness caused by subsequent heating before and after changing the inner diameter of the outer wall of the reaction tube 11, or even when a certain amount of the substance has settled on the wall, the inner diameter can be accurately measured and these factors will not have detrimental effect on measurement.

Third Embodiment

A third embodiment is described with reference to FIG. 7 and 8. Since the third embodiment is a modification of the first and second embodiments (see FIGS. 2-6), the same reference numbers indicate parts similar or similar to those used in the first and second embodiments, and their repeated description may be omitted.

As shown in FIG. 7, in the third embodiment, instead of the left upper plate 21a and the right upper plate 21b, there is a rotatable upper plate 21c. Laser measuring devices 59a and 59b are mounted on the left and right sides of the pivoting upper plate 21c (see FIG. 7). As shown in FIG. 8, this pivoting upper plate 21c is located on the upper sides of the left element 29a, the right element 29b, and the lower elements 25a and 25b. In addition, the rotatable top plate 21c is provided with a mechanism by which the plate 21c can be rotated from the outside of the reaction tube 11 independently of these components. By rotating the upper pivot plate 21c, the above-described laser measuring devices 59a and 59b can be rotated without changing their constant distance from the center of the reaction tube 11.

The pivoting upper plate 21c comprises at least two slots (not shown) that extend from the outer circumference to the inner circumference of a cylindrical shape, where at least one of the slots is provided with a hinge or retainer, so that the upper plate has a structure in which it would open and cover at least part of the cylinder. Thus, the pivoting upper plate 21c can also be opened and closed in accordance with the opening and closing of the latches 27a-27c.

The following describes a method for measuring the diameter of the reaction tube 11 using a cylindrical tube measuring device 2c in a third embodiment of the invention. In a third embodiment, the outer diameter of the reaction tube 11 can be measured using laser measuring devices 59a and 59b located on the pivoting upper plate 21c. In addition, the laser measuring devices 59a and 59b are not in contact with the outer circumference of the reaction tube 11, so that the rotatable top plate 21c can be rotated smoothly during measurements. Thus, the outer diameter of the reaction tube 11 can be accurately measured over one revolution around the reaction tube 11.

Also, since in the present third embodiment, if such a laser measuring device is located in two opposite places on the rotatable top plate 21c, the outer diameter of one circumference of the pipe 11 can be measured by rotating the rotatable top plate 21c through 180 °.

On the other hand, it is also possible to detach the laser measuring devices 59a and 59b from the rotatable top plate 21c and to install a contact type sensor for ultrasonic measurement, as in the second embodiment. In this case, the size of the inner diameter of the reaction tube 11 can be measured by subtracting the wall thickness measured by this sensor from the size of the outer diameter measured by laser measuring devices 59a and 59b. In this case, as in the case of installing the laser measuring device, the thickness in one section of the reaction tube 11 can be measured by turning the pivoting upper plate 21c, and the size of the inner diameter of the reaction tube 11 can be advantageously calculated.

In the third embodiment, there are two laser measuring devices 59a and 59b, but any one of them can be left and the other can be removed. In this case, the outer diameter of one section of the reaction tube 11 can be measured by setting the rotation angle of the pivoting upper plate 21c to 360 °.

Although the rotatable upper plate 21c described above has a cylindrical shape in the third embodiment, it absolutely does not have to have a cylindrical shape. For example, the shape of its inner and outer periphery may be rectangular or any other polygonal shape.

In addition, the pivoting upper plate 21c need not be provided with an open and close type mechanism. For example, the pivoting upper plate may be cylindrical without a slot so that it cannot be opened or closed, and may have a structure that can be worn externally with an inner hole in the pivoting upper plate 21 on the free end of the reaction tube 11. In addition, the pivoting upper the plate 21 may have a structure that can be detached independently of the bottom (see Fig. 8), or may be a structure made as a whole.

Other embodiments of the invention

The above description of embodiments is given only as an example of a device for measuring a cylindrical pipe according to the present invention and is not intended to limit the scope of the invention defined by the claims. In addition, the relevant features of the parts of the present invention are not limited to those indicated in the embodiments described above, and many modifications can be made within the technical scope of the invention as defined in the claims.

For example, although the first to third embodiments are used to measure a reaction pipe used in a transducer that may undergo creep deformation, they can be used to measure various other pipes, such as gas pipes, water pipes, and the like. The use of the measuring device according to the invention is not limited to the measurement of pipes, if only the tubular object contains a hollow inner space, then using the measuring device can be measured inner diameter, outer diameter and wall thickness of the object.

In addition, in the measuring device for measuring the outer diameter in the first and second embodiments, it is also possible to use a micrometer or the like, as well as calipers in accordance with the outer diameter of the pipe to be measured.

In addition, the outer cross-sectional shape of the pipe to be measured does not have to be round, it can have, for example, a curved, for example elliptical, shape.

Considering that the measuring device according to the present invention is used in a workshop with a complex structure, which is difficult to operate in, the measuring device can be designed so that it contains an opening in a certain part thereof for passing a cable, a seat belt, etc. P. to prevent falling.

List of positions and their interpretation

1 - Converter

2 - Measuring device

2b - Measuring device

2c - Measuring device

4 - Measuring device

11 - Reaction tube

21a - Left upper plate

21b - Right upper plate

21c - Swivel Top Plate

22a - Left fixed element

22b - Right Lockable Element

23 - Connecting element

25a - Lower element

25b - Lower Element

26a - Facial opening

26b - Facial opening

27a - Lock

27b - Lock

27c - Lock

28 - Holding element

29a - Left element

29b - Right Element

51a - Sensor

51b - Sensor

53a - Emphasis

53b - Emphasis

55a - Pusher device

55b - Pusher device

57a - Spring

57b - Spring

59a - Laser measuring device

59b - Laser measuring device

61a - Hinge

61b - Hinge

61c - Hinge

61d - Hinge

X - Measurement Direction

Y - Starting direction

Claims (9)

1. A device for measuring a cylindrical pipe, containing: at least one pair of fastened elements, each of which contains an inner surface provided with a cutout and designed to position the outer circumference of the cylindrical pipe in the middle and fix it on both sides with respect to the diameter perpendicular to the direction of diameter measurement; a first retaining element for connecting fixed elements to each other on the outer circumference of the cylindrical pipe; and a second retaining element for holding the disclosed portion for fastened elements with the possibility of opening and closing; in which at least a portion of each fixed element forms a plane perpendicular to the axial direction of the cylindrical pipe. 2. A device for measuring a cylindrical pipe according to claim 1, wherein each fixed element is provided with a supporting part for mounting an ultrasonic device for measuring a thickness brought into contact with the outer circumference of the cylindrical pipe along a line passing in the direction of measurement of the cylindrical pipe. 3. A device for measuring a cylindrical pipe according to claim 1 or 2, in which the elastic element is installed on the inner surface of each fixed element. 4. A device for measuring a cylindrical pipe according to any one of paragraphs. 1-3, containing the upper plate, made with the possibility of rotation in the circumferential direction of the cylindrical pipe. 5. A device for measuring a cylindrical pipe according to any one of paragraphs. 1-4, in which each fixed element is equipped with a supporting part for mounting a non-contact type device for measuring the outer diameter along a line running in the direction of measurement of the cylindrical pipe.

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