A device and method for detecting the bevel length of large-diameter pipe ends

Abstract

The present invention relates to the technical field of pipe size detection, and in particular to a device and method for detecting the bevel length of a large-diameter pipe end. The device comprises a moving unit, which includes at least three rollers whose rotation axes are parallel to each other, one of the rollers being configured with a drive, the rollers being used to fit on the inner and outer walls of the pipe to be inspected and to be clamped on the circumference of the pipe through rollers on the inner and outer walls; a detection unit, which moves along the circumference of the pipe following the moving unit, and comprises a telescopic component and a measuring component, one end of the telescopic component being used to fit on the end face of the pipe to be inspected and adapt to its contour expansion and contraction, and the other end being provided with the measuring component, the measuring component being used to detect the expansion and contraction amount of the telescopic component; the device can collect all data along the end face of the pipe during the detection process, and the judgment is more comprehensive and accurate than the existing detection method which only collects data from two or four points, and the detection result is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe size detection, and in particular to a device and method for detecting the bevel length of a large-diameter pipe end. Background Art

[0002] Currently, large-diameter pipes (nominal diameter greater than 650mm) are widely used. During pipe installation and construction, whether the bevel length of the pipe end face meets the standard directly affects the difficulty or success of the pipe installation.

[0003] In the prior art, the bevel length of the end face of large-diameter pipes is usually measured by a square ruler, a plumb line, or a dedicated platform. Among them, (1) square ruler measurement requires a large square ruler, which is less convenient to detect and the measurement is usually carried out at two points, resulting in poor detection accuracy; (2) plumb line measurement is also difficult to collect data. When using this method, four points are usually detected along the circumference, and the detected data also has a large deviation from the actual situation; (3) the dedicated platform detection method reduces the difficulty of the detection personnel, but the detection of large-diameter pipes requires the configuration of a larger detection platform, the detection equipment cost is high, and the pipes need to be transported and hoisted onto the dedicated platform, resulting in a significant increase in detection costs. Its detection flexibility is poor, and its application is limited by the production line scheduling, and it cannot be detected at any time when it is temporarily needed. Summary of the Invention

[0004] In response to the shortcomings of the prior art, the present invention aims to provide a device and method for detecting the bevel length of large-diameter pipe ends, which can automatically move along the circumference of the pipe, have high detection accuracy, and can perform detection at any time. To achieve the above objectives, the present invention solves the problem through the following technical solutions:

[0005] In a first aspect, the present invention provides a device for detecting the bevel length of a large-diameter pipe end, comprising:

[0006] A moving unit comprising at least three rollers with rotation axes parallel to each other, one of the rollers being configured with a drive, the rollers being adapted to fit against the inner and outer walls of the pipe to be inspected and to be clamped against the pipe circumference by the rollers on the inner and outer walls;

[0007] The detection unit moves along the circumference of the pipe following the moving unit, and includes a telescopic component and a measuring component. One end of the telescopic component is used to fit the end face of the pipe to be inspected and adapt to its contour expansion and contraction, and the other end is provided with the measuring component, which is used to detect the expansion and contraction amount of the telescopic component.

[0008] As a further technical solution, the mobile unit also includes a first mounting seat for mounting the roller, only one of the rollers is attached to the inner wall or outer wall of the pipe to be inspected, and the roller is detachably connected to the first mounting seat.

[0009] As a further technical solution, the moving unit includes three rollers, the one detachably connected to the first mounting seat is an active roller, and the other two are driven rollers.

[0010] As a further technical solution, the active roller is used to fit the outer wall of the pipe to be inspected.

[0011] As a further technical solution, the active roller is connected to the first mounting seat by bolts, and the first mounting seat is provided with a hole. The distance between the active roller and the driven roller can be adjusted by adjusting the position of the bolt in the hole.

[0012] As a further technical solution, the end of the telescopic assembly that is in contact with the end face of the pipe to be inspected is provided with a roller that rolls along the end face.

[0013] As a further technical solution, the telescopic assembly is provided with an elastic member for causing it to retract.

[0014] As a further technical solution, the measuring assembly includes a first scale portion and a second scale portion, and the two constitute a vernier scale, and the first scale portion moves following the telescopic assembly.

[0015] As a further technical solution, the measuring component further includes a displacement sensor associated with the vernier caliper, and the displacement sensor is configured with a control system.

[0016] In a second aspect, the present invention provides a detection method according to the detection device according to the first aspect, comprising the following steps:

[0017] The rollers are clamped on the circumference of the pipe to be inspected, and the driven roller rotates and drives the other rollers to rotate, so that the moving unit moves along the circumference of the pipe and drives the detection unit to move at the same time. At this time, the telescopic component is extended and retracted to adapt to the end face of the pipe to be inspected. The telescopic amount of the telescopic component is detected by the measuring component to obtain the bevel cutting length.

[0018] The beneficial effects of the present invention are as follows:

[0019] (1) The detection device of this embodiment of the present invention uses a plurality of rollers to clamp the movable unit on the circumference of the pipe, and drives the movable unit to automatically move along the circumference of the pipe, thereby reducing the intensity and difficulty of manual operation, improving detection efficiency, and avoiding measurement deviations caused by human factors during manual operation.

[0020] (2) In the present invention, since the multiple rollers have a certain length and fit tightly against the pipe wall, the detection device always keeps its trajectory curve perpendicular to the pipe axis when rotating along the circumference of the pipe, thereby ensuring that the position of the detection device relative to the length direction of the pipe remains unchanged.

[0021] (3) The telescopic assembly of the present invention is capable of expanding and contracting to adapt to changes in the end face of the pipe to be inspected. During the inspection process, all data along the end face of the pipe can be collected. Compared with the existing inspection method that only collects data from two or four points, the judgment is more comprehensive and accurate, and the inspection result is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which form part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their description are provided to illustrate the present invention and are not intended to limit the present invention. It should also be understood that these drawings are shown for simplicity and clarity and are not necessarily drawn to scale. The present invention will now be described and explained with additional specificity and detail through the use of the accompanying drawings, in which:

[0023] Figure 1 A schematic diagram of the structure of the detection device according to an embodiment of the present invention is shown;

[0024] Figure 2 A schematic diagram of the disassembly structure of the detection device according to an embodiment of the present invention is shown;

[0025] Figure 3 A schematic diagram of the use of the detection device in an embodiment of the present invention is shown;

[0026] Figure 4 Shown Figure 3 A partial enlarged schematic diagram in the middle;

[0027] Figure 5 A schematic diagram of the use of the detection device in an embodiment of the present invention is shown;

[0028] Figure 6 Shown Figure 5 A partial enlarged schematic diagram of point B in the middle.

[0029] In the figure: 1. Active roller; 2. Active roller retainer; 3. First driven roller; 4. First driven roller retainer; 5. Second driven roller; 6. Second driven roller retainer; 7. First mounting seat; 8. Roller; 9. Roller retainer; 10. Second mounting seat; 11. First scale portion; 12. Spring; 13. Bolt; 14. Belt hole; 15. First through hole; 16. Second through hole; 17. Second scale portion; 18. Sliding portion; 19. Spring mounting portion; 20. Pipe to be inspected; 21. End face of pipe to be inspected. DETAILED DESCRIPTION

[0030] The technical solutions in typical embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] Example 1

[0032] like Figure 1 and Figure 2 As shown, this embodiment provides a device for detecting the bevel length of a large-diameter pipe end, comprising:

[0033] The moving unit comprises at least three rollers with rotation axes parallel to each other, one of the rollers being provided with a drive, the rollers being adapted to fit against the inner and outer walls of the pipe to be inspected and to be clamped against the pipe circumference by the rollers on the inner and outer walls;

[0034] The detection unit moves along the circumference of the pipe following the moving unit. It includes a telescopic component and a measuring component. One end of the telescopic component is used to fit the end face of the pipe to be inspected and adapt to its contour expansion and contraction. The other end is provided with a measuring component, which is used to detect the expansion and contraction amount of the telescopic component.

[0035] The detection device of this embodiment uses the cooperation of multiple rollers to clamp the mobile unit on the circumference of the pipe, and automatically moves the mobile unit along the circumference of the pipe through driving, which reduces the intensity and difficulty of manual operation, improves the detection efficiency, and avoids measurement deviations caused by human factors during manual operation.

[0036] Since the multiple rollers of the detection device have a certain length and fit tightly against the pipe wall, the detection device's trajectory curve is always kept perpendicular to the pipe axis when it rotates along the circumference of the pipe (since the diameter fluctuation of the entire pipe section is relatively small relative to the pipe diameter value, the pipe can be considered as a constant diameter pipe), thereby ensuring that the position of the detection device relative to the length direction of the pipe remains unchanged, that is, the rotation axis of the roller is always parallel to the axis of the pipe to be inspected.

[0037] The telescopic component expands and contracts to adapt to changes in the end face of the pipe to be inspected. During the inspection process, all data along the end face of the pipe can be collected. Compared with the existing inspection method that only collects data from two or four points, the judgment is more comprehensive and accurate, and the inspection results are more accurate.

[0038] The movable unit includes at least three rollers, as long as they can achieve clamping around the pipe. It should be understood that if at least one roller fits the inner wall of the pipe, then at least two rollers fit the outer wall, and vice versa. Furthermore, the driven rollers can be located on either the inner or outer wall of the pipe, as long as they can drive the movable unit. In this embodiment, the drive is a motor (not shown), but other power devices are also possible.

[0039] In order to conveniently install the detection device on the circumference of the pipe to be inspected at the beginning of the inspection, the mobile unit also includes a first mounting seat 7 for mounting a roller. Only one roller is attached to the inner wall or outer wall of the pipe to be inspected, and the roller is detachably connected to the first mounting seat 7.

[0040] In this embodiment, Figure 1 and Figure 2 As shown, the mobile unit includes three rollers. The active roller 1 is detachably connected to the first mounting base 7, and the other two are driven rollers, namely the first driven roller 3 and the second driven roller 5. It is understood that the rollers need to be equipped with a cage in order to rotate. The active roller 1 is equipped with an active roller cage 2, the first driven roller 3 is equipped with a first driven roller cage 4, and the second driven roller 5 is equipped with a second driven roller cage 6. The active roller 1 is used to fit the outer wall of the pipe 20 to be inspected, and the first driven roller 3 and the second driven roller 5 are both used to fit the inner wall of the pipe 20 to be inspected. Figure 3 、 Figure 4 、 Figure 5 and Figure 6 shown.

[0041] The active roller 1, the first driven roller 3 and the second driven roller 5 are arranged in an isosceles triangle, wherein the first driven roller 3 and the second driven roller 5 are fixed to the first mounting seat 7 through a retaining frame, and the active roller 1 is detachably connected to the first mounting seat 7 through the retaining frame.

[0042] The first mounting seat 7 is a plate structure, and is substantially triangular in shape.

[0043] The active roller 1 is bolted to the first mounting seat 7. The first mounting seat 7 has a hole 14. The spacing between the active roller 1 and the driven roller is adjusted by adjusting the position of the bolt 13 in the hole 14. Specifically, the active roller retainer 2 has a boss at the end, and a corresponding groove is provided on the first mounting seat 7. The boss slides within the groove. There are two holes 14, each of a specific length, which aligns with the sliding direction of the boss in the groove. The spacing between the active roller 1 and the driven roller is adjusted by adjusting the position of the bolt 13 in the hole 14, allowing for compatibility with pipes of varying wall thicknesses.

[0044] The end of the telescopic assembly that contacts the end face 21 of the pipe to be inspected is equipped with a roller 8 that rolls along the end face. Roller 8 is designed to contact the end face 21 of the pipe to be inspected. By rolling roller 8 with the pipe end instead of sliding it, the resistance of the inspection device to movement of the vernier scale relative to the pipe is significantly reduced. This avoids the situation in which the vernier scale is blocked and cannot move when it encounters pits or protrusions on the pipe end during point-and-needle contact.

[0045] It is easy to understand that in order to achieve rolling, the roller 8 needs to be equipped with a retaining frame, so the roller 8 is equipped with a roller retaining frame 9.

[0046] The main body of the telescopic assembly is a stepped shaft and a second mounting base 10 that keeps the stepped shaft sliding. The second mounting base 10 is composed of plates forming a gantry structure, and its two leg plates are installed on one side of the first mounting base 7, and a roller is set on the opposite side of the side.

[0047] The telescopic assembly is equipped with an elastic member to promote its retraction. In this embodiment, the elastic member is a spring 12. A first through hole 15 is provided on the first mounting seat 7. It can be understood that after the three rollers are installed around the pipe, the axis of the first through hole 15 just corresponds to the end face of the pipe. Figure 2 A second through-hole 16 is provided (in the center direction) coaxial with the first through-hole 15. The stepped shaft includes a sliding portion 18 and a spring mounting portion 19. The diameter of the spring mounting portion 19 is smaller than that of the sliding portion 18. The sliding portion 18 passes through the first through-hole 15 and slidably engages with it. The spring mounting portion 19 passes through the second through-hole 16 and slidably engages with it. The spring 12 is mounted on the spring mounting portion 19, with one end resting on the stepped end surface of the sliding portion 18 and the other end resting on the right side plate of the second mounting seat 7. It will be understood that the spring 12 cannot pass through the first through-hole 15.

[0048] The measuring assembly includes a first scale portion 11 and a second scale portion 17, and the two constitute a vernier caliper, and the first scale portion 11 moves along with the telescopic assembly. The first scale portion 11 and the second scale portion 17 are both provided with scales, and the vernier caliper can adopt the vernier caliper in the prior art, and its working principle is the same as that of the vernier caliper, which will not be described in detail here. In addition, the measuring assembly also includes a displacement sensor, which is associated with the vernier caliper, and the displacement sensor is equipped with a control system. The control system is provided with an automatic reading supporting device and a screen, so that the corresponding data and curves detected can be displayed on the screen to realize data visualization, and by associating the system with a printer, the test data can be printed. How the displacement sensor and its control system realize detection data and data visualization belongs to the prior art and will not be described in detail here.

[0049] In the initial moving state of the detection device, the spring 12 reserves an appropriate compression amount to ensure that when the detection device moves along the pipe and encounters a concave pipe end, the first scale part 11 can be pushed deeper relative to the first mounting seat 7 under the thrust of the reserved compression force of the spring 12. When the pipe end is convex, the first scale part 11 is placed on the end face of the pipe end, and the roller 8 pushes the first scale part 11 to extend relative to the first mounting seat 7. By providing scales on the first scale part 11 and the second scale part 17, when the detection device moves, when the pipe end is uneven, the first scale part 11 is driven to move relative to the first mounting seat 7, so that By reading the value of the vernier caliper (the telescopic amount of the telescopic assembly is reflected by the value of the vernier caliper), the verticality change value of the pipe end is obtained, and manual reading can be performed in this way; in addition, by installing a displacement sensor on the top of the first mounting seat 7, it is associated with the vernier caliper, and a control system is added outside the detection device to convert the movement of the detection device relative to the pipe along the circumference of the pipe and the displacement of the vernier caliper relative to the first mounting seat 7 into position and end face size change data and curves, thereby achieving the purpose of automatically detecting the end face bevel length when the detection device moves along the circumference of the pipe.

[0050] Example 2

[0051] This embodiment provides a detection method according to the detection device in Embodiment 1, comprising the following steps:

[0052] First, place the pipe horizontally on the pipe placement bracket or roller frame, and keep the measured pipe end hanging out of the bracket or roller frame by ≥150mm.

[0053] Next, place the first driven roller 3 and the second driven roller 5 of the detection device on the inner wall of the pipe and fit them together. Adjust and install the active roller 1 and lock it to clamp the three rollers on the circumference of the pipe 20 to be inspected. At this time, the rotation axis of the rollers is parallel to the axis of the coffin 20 to be inspected. Figure 5 and Figure 6 As shown, at the same time, the roller 8 at the opposite end of the vernier scale is kept close to the end face of the pipe and the spring 12 is kept with a certain preload force.

[0054] Then, the driven active roller 1 rotates and drives the first driven roller 3 and the second driven roller 5 to rotate, so that the moving unit moves along the circumference of the pipe and drives the detection unit to move at the same time. At this time, the telescopic component is telescoped to adapt to the end face of the pipe to be inspected. The telescopic amount of the telescopic component is detected by the measuring component to obtain the end face bevel length data.

[0055] If manual reading is used for inspection, the number of measuring points n along the circumference of the pipe is designed according to the diameter of the pipe, and the pipe end is divided into n sections along the circumference and marked (the larger the n value, the more accurate the measurement result). The active roller 1 is started to move the inspection device along the circumference of the pipe. When it reaches the section, the manual reading of the scale value is paused until all n data are collected. The maximum and minimum values ​​of the n data are the maximum bevel length of the pipe end. If an automatic reading device is used for inspection, the system collects data around the entire circumference and forms the corresponding curve data and the difference between the maximum and minimum values, as well as the average difference around the entire circumference.

[0056] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solutions of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the scope of protection of the technical solutions of the present invention.

Claims

1. A device for detecting the bevel length of a large-diameter pipe end, characterized in that: include: The movable unit comprises at least three rollers whose rotation axes are parallel to each other, one of the rollers being equipped with a drive, the rollers being used to fit against the inner and outer walls of the pipe to be inspected and to be clamped against the pipe circumference by the rollers on the inner and outer walls; the movable unit further comprises a first mounting seat for mounting the rollers, only one of the rollers being in contact with the inner or outer wall of the pipe to be inspected, and the roller is detachably connected to the first mounting seat; the movable unit comprises three rollers, the active roller being detachably connected to the first mounting seat, and the other two being driven rollers; the active roller being used to fit against the outer wall of the pipe to be inspected, the first driven roller and the second driven roller both being used to fit against the inner wall of the pipe to be inspected; the active roller being equipped with an active roller holder, the first driven roller being equipped with a first driven roller holder, and the second driven roller being equipped with a second driven roller holder; The detection unit moves along the circumference of the pipe following the moving unit, and includes a telescopic component and a measuring component. One end of the telescopic component is used to fit the end face of the pipe to be inspected and adapt to its contour expansion and contraction, and the other end is provided with the measuring component, and the measuring component is used to detect the expansion and contraction amount of the telescopic component; the end of the telescopic component that fits the end face of the pipe to be inspected is provided with a roller that rolls along the end face, and the roller is used to fit the end face of the pipe to be inspected, and the roller is equipped with a roller holder; the telescopic component is equipped with an elastic member that causes it to retract.

2. A device for detecting the bevel length of a large-diameter pipe end as claimed in claim 1, characterized in that: The active roller is connected to the first mounting seat by bolts. The first mounting seat is provided with a belt hole. The distance between the active roller and the driven roller can be adjusted by adjusting the position of the bolt in the belt hole.

3. A device for detecting the bevel length of a large-diameter pipe end as claimed in claim 1, characterized in that: The measuring assembly includes a first scale portion and a second scale portion, and the two constitute a vernier scale, and the first scale portion moves following the telescopic assembly.

4. A device for detecting the bevel length of a large-diameter pipe end as claimed in claim 3, characterized in that: The measuring assembly further comprises a displacement sensor associated with the vernier scale, wherein the displacement sensor is configured with a control system.

5. The detection method according to any one of claims 1 to 4, characterized in that: The following steps are involved: The rollers are clamped on the circumference of the pipe to be inspected, and the driven roller rotates and drives the other rollers to rotate, so that the moving unit moves along the circumference of the pipe and drives the detection unit to move at the same time. At this time, the telescopic component is extended and retracted to adapt to the end face of the pipe to be inspected. The telescopic amount of the telescopic component is detected by the measuring component to obtain the bevel cutting length.

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