A general measuring device for pipe joint misalignment

Abstract

This utility model discloses a universal measuring device for pipe joint misalignment, comprising: a V-shaped block, which is an axisymmetric block structure with a V-shaped top surface; a clamping mechanism, which includes a vertically arranged first guide rail and a bidirectional guide rail that can move up and down along it; the bidirectional guide rail is horizontally arranged and has two clamping arms that can move towards or away from it; a measuring mechanism, which includes a vertically arranged second guide rail, the second guide rail being connected to a measuring arm via a second universal joint, and the measuring arm being connected to a displacement sensor via a first universal joint; wherein, the two clamping arms are used to clamp the non-measuring end of the pipe joint; the displacement sensor is used to contact the outer wall surface of the end of the pipe to be measured and to collect the circumferential trajectory on the same cross section; a data processing module is used to receive the circumferential trajectory and use it to determine whether there is misalignment in the end of the pipe joint to be measured. This solves the problem that existing pipe joint forging misalignment detection devices cannot simultaneously meet the requirements of adapting to the forging environment and achieving high detection accuracy.

Description

[Technical Field]

[0001] This utility model belongs to the field of forging inspection technology, specifically relating to a universal measuring device for pipe joint misalignment. [Background Technology]

[0002] Pipe fitting forgings are key connecting components in mechanical manufacturing and are widely used in hydraulic pipelines, exhaust systems, and other fields. During forging production, factors such as die fitting accuracy, uneven metal flow, or forging pressure fluctuations can cause "misalignment" deviations when the two half-dies are joined. This deviation directly affects the positioning accuracy and assembly reliability of subsequent machining, leading to an increase in the scrap rate.

[0003] Current inspection methods include coordinate measuring machines (CMMs) and template comparison methods, but they have the following significant drawbacks: Although CMMs achieve an accuracy of ±0.01mm, the inspection time for a single piece is 5-10 minutes, which cannot meet the high-frequency inspection requirements of 2-3 pieces per minute on a production line. Furthermore, they are not easily moved to the field and cannot inspect pipe fittings under high-temperature conditions. Template comparison methods are simple to operate, but due to their low accuracy (error ≥ ±0.2mm) and high subjectivity, they are difficult to meet the inspection requirements of high-precision fields such as aerospace (misalignment ≤ 0.05mm). [Utility Model Content]

[0004] The purpose of this invention is to provide a universal measuring device for pipe joint misalignment, so as to solve the problem that existing pipe joint forging misalignment detection devices cannot simultaneously meet the requirements of adapting to the forging environment and achieving high detection accuracy.

[0005] This utility model adopts the following technical solution: a universal measuring device for pipe joint misalignment, wherein the pipe joint is a right-angle pipe joint or a tee pipe joint, and the measuring device includes:

[0006] A V-shaped block, which is an axisymmetric block structure with a V-shaped top surface, on which the pipe body to be tested, the pipe fitting, is placed; the axis of the pipe body to be tested is perpendicular to the center of symmetry of the V-shaped block;

[0007] A clamping mechanism includes a vertically arranged first guide rail and a bidirectional guide rail that can move up and down along it; the bidirectional guide rail is horizontally arranged and has two clamping arms that can move towards or away from each other along it; the extension direction of each clamping arm is perpendicular to the axial direction of the bidirectional guide rail.

[0008] A measuring mechanism includes a vertically arranged second guide rail, the second guide rail being connected to a measuring arm via a second universal joint, the measuring arm being connected to a displacement sensor via a first universal joint; the displacement sensor being connected to a data processing module.

[0009] The system includes two clamping arms for holding the non-measured end of the pipe fitting; a displacement sensor for contacting the outer wall of the pipe fitting under test and collecting the circumferential trajectory on the same cross-section; and a data processing module for receiving the circumferential trajectory and using it to determine whether there is misalignment of the pipe fitting at the test end.

[0010] Furthermore, the bidirectional guide rail is detachably connected to the first guide rail via fasteners.

[0011] Furthermore, each clamping arm is detachably connected to the bidirectional guide rail via a locking element.

[0012] Furthermore, the second guide rail is a telescopic guide rail.

[0013] The beneficial effects of this utility model are: it provides a special measuring tool that takes into account high precision, high efficiency and adaptability to forging environment (high temperature, oil pollution) to realize real-time monitoring at the production line, reduce scrap rate and improve production efficiency.

[0014] In terms of measurement accuracy, the clamping mechanism allows the clamping arms to move horizontally along bidirectional guide rails. The relative distance between the two clamping arms can be precisely adjusted based on the position of the pipe body at the non-measuring end of the pipe joint. Finally, the locking mechanism locks the position of the clamping arms, achieving stable clamping of the pipe body and effectively avoiding errors caused by pipe joint swaying during measurement. Simultaneously, the contact displacement sensor has an accuracy of ±0.03mm and a single-piece detection time of ≤10 seconds (including clamping), improving efficiency by more than 30 times compared to CMM. The displacement sensor collects the circumferential trajectory on the same cross-section, which is then precisely analyzed in conjunction with the data processing module to ensure accurate and reliable measurement results. The hard alloy probe of the displacement sensor has a lifespan of ≥100,000 cycles, avoiding frequent sensor replacements and reducing maintenance costs.

[0015] In terms of versatility, the bidirectional guide rail can move up and down along the first guide rail, and the bidirectional guide rail and the first guide rail can be detachably locked together by fasteners. The height of the bidirectional guide rail can be flexibly adjusted to adapt to different specifications of pipe fittings. Moreover, the device is suitable for testing pipe fittings of various sizes, such as right-angle pipe fittings or tee pipe fittings, thus expanding its application range.

[0016] This invention uses a base and clamping mechanism made of high-temperature resistant alloy material, and the heat insulation coating on it can work stably in an environment of about 150°C. It can be tested directly without waiting for the forging to cool down, saving time. [Attached Image Description]

[0017] Figure 1 This is a schematic diagram of the structure of a universal measuring device for pipe joint misalignment according to the present invention;

[0018] Figure 2 for Figure 1 Top view;

[0019] Figure 3 This is a schematic diagram of the assembly of the bidirectional guide rail and the first guide rail of this utility model;

[0020] Figure 4 for Figure 3 Rear view;

[0021] Figure 5 This is a schematic diagram illustrating the working state of the measuring right-angle pipe joint of this utility model;

[0022] Figure 6 This is a schematic diagram showing the working state of the measuring tee pipe joint of this utility model.

[0023] The components include: 1. base; 2. first guide rail; 3. bidirectional guide rail; 4. V-block; 5. displacement sensor; 6. second guide rail; 7. data processing module; 8. clamping arm; 9. first universal joint; 10. measuring arm; 11. second universal joint; 12. fastener; 13. locking component; 14. right-angle pipe connector; and 15. tee pipe connector.

Detailed Implementation Methods

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0025] This utility model provides a universal measuring device for pipe joint misalignment, such as... Figure 1 As shown, the pipe fitting is a right-angle pipe fitting 14 or a tee pipe fitting 15. The measuring device includes a clamping mechanism, a V-block 4, and a measuring mechanism arranged sequentially on the upper surface of the base 1. The specific structure is as follows:

[0026] V-block 4 is an axisymmetric block structure with a V-shaped top surface, on which the test end tube of the pipe connector is placed; the axis of the test end tube is perpendicular to the center of symmetry of the V-block.

[0027] The clamping mechanism includes a vertically arranged first guide rail 2 and a bidirectional guide rail 3 that can move up and down along it; the bidirectional guide rail 3 is horizontally arranged and has two clamping arms 8 that can move towards or away from each other along it; the extension direction of each clamping arm 8 is perpendicular to the axial direction of the bidirectional guide rail 3.

[0028] The measuring mechanism includes a vertically arranged second guide rail 6, which is connected to a measuring arm 10 via a second universal joint 11. The measuring arm 10 is connected to a displacement sensor 5 via a first universal joint 9, and the displacement sensor 5 is connected to a data processing module 7. The displacement sensor 5 is preferably a non-contact laser displacement sensor or an inductive displacement sensor. The measuring end is equipped with a carbide probe (hardness HRC 60-65) to avoid probe wear caused by oxide scale on the surface of high-temperature forgings, ensuring long-term detection accuracy.

[0029] The two clamping arms 8 are used to clamp the non-measured end of the pipe joint; the displacement sensor 5 is used to contact the outer wall of the pipe to be measured and collect the circumferential trajectory on the same cross section; the data processing module is used to receive the circumferential trajectory and use it to determine whether there is misalignment of the pipe to be measured end of the pipe joint, and supports stable data transmission under high temperature environment.

[0030] The base 1 and all components of the clamping mechanism are made of high-temperature resistant alloys (such as Inconel 718) and coated with ceramic heat-insulating coating. They can work continuously in an environment of 200°C. Compared with the application scenarios of a coordinate measuring machine, the universal measuring device for measuring pipe joint misalignment of this utility model is more suitable for measuring the residual heat state of pipe joint forgings after forging (usually the temperature is ≤150°C).

[0031] In some embodiments, the bidirectional guide rail 3 is detachably connected to the first guide rail 2 via fasteners 12. After the bidirectional guide rail 3 moves up and down to a certain position on the first guide rail 2, the positions of both are locked by the fasteners 12.

[0032] In some embodiments, each clamping arm 8 is detachably connected to the bidirectional guide rail 3 via a locking member 13. The relative positions of the two clamping arms 8 are adjusted according to the position of the non-measuring end of the pipe fitting under test. After clamping the non-measuring end of the pipe fitting, the clamping arms 8 are locked to the bidirectional guide rail 3 via the locking member 13, ensuring stable clamping and improving measurement accuracy.

[0033] In some embodiments, the second guide rail 6 is a telescopic guide rail. The second guide rail 6 can be raised and lowered, which can easily adjust the position of the displacement sensor 5 to meet the measurement needs of pipe joints of different sizes, further improving the versatility and ease of operation of the device.

[0034] The method of using the universal measuring device for pipe joint misalignment of this utility model is as follows:

[0035] Place the measuring end of the right-angle pipe connector 14 or the tee pipe connector 15 horizontally between the two clamping arms 8, ensuring that the axis of the pipe to be measured is perpendicular to the center of symmetry of the V-block 4.

[0036] Move the bidirectional guide rail 3 up and down along the first guide rail 2 and adjust it to a suitable height. Then, use fastener 12 to lock the position of the bidirectional guide rail 3 and the first guide rail 2. According to the position of the non-measuring end of the pipe body of the pipe joint to be tested, adjust the two clamping arms 8 so that they move towards each other or away from each other on the bidirectional guide rail 3 and clamp the non-measuring end of the pipe joint to be tested. Then, use locking member 13 to fix the clamping arms 8 to the bidirectional guide rail 3.

[0037] Adjust the height of the telescopic second guide rail 6 so that the displacement sensor 5 is in a suitable measurement position;

[0038] Adjust the measuring arm 10, and make the displacement sensor 5 contact the outer wall surface of the tube to be measured through the first universal joint 9 and the second universal joint 11;

[0039] The displacement sensor 5 collects circumferential trajectory data on the same cross section and transmits the data to the data processing module 7. The data processing module 7 analyzes and processes the received circumferential trajectory data to determine whether there is misalignment of the pipe body at the test end of the pipe joint, and outputs the measurement results.

[0040] Example

[0041] Right-angle pipe joints and tee pipe joints to be tested were selected, with the right-angle pipe joint having a diameter of 50mm and the tee pipe joint having a main pipe diameter of 60mm and a branch pipe diameter of 40mm. Three sets of tests were performed using the universal pipe joint misalignment measuring device provided by this invention, and the results were compared with those obtained by calipers and a coordinate measuring machine (CMM). Among existing measurement methods, the CMM has the highest accuracy; therefore, the CMM measurement results are considered the actual misalignment values ​​in this comparative data analysis.

[0042] Table 1 Comparison of test results

[0043]

[0044] The test results are shown in Table 1:

[0045] When this device was used to measure the right-angle pipe joint, the measured misalignment value was 0.12 mm. Compared with the actual misalignment value of 0.11 mm measured by the coordinate measuring machine, the measurement error was 0.01 mm. For the tee pipe joint, the measured misalignment value was 0.15 mm, while the actual misalignment value was 0.14 mm, and the measurement error was also 0.01 mm.

[0046] The misalignment of the right-angle pipe joint was 0.18 mm when measured manually with conventional calipers. Compared with the actual value of 0.11 mm measured by the coordinate measuring machine, the measurement error reached 0.07 mm. When measuring the tee pipe joint, the misalignment value measured by conventional methods was 0.22 mm, while the actual misalignment value was 0.14 mm, and the measurement error was 0.08 mm.

[0047] In summary, the measurement error of this measuring device is around 0.01mm, while the error of conventional measuring methods is as high as 0.07-0.08mm. The measurement accuracy of this device is significantly better than that of caliper measurement and is closer to the actual misalignment value. It not only meets the requirements of adapting to the forging environment, but also achieves high precision and high efficiency in measurement.

[0048] This invention provides a specialized measuring tool that combines high precision and efficiency with adaptability to forging environments (high temperature, oil contamination), enabling real-time monitoring on the production line, reducing scrap rates, and improving production efficiency. Because this invention uses a high-temperature resistant alloy base and clamping mechanism, and its heat-insulating coating allows for stable operation at around 150°C, it allows for direct testing without waiting for the forging to cool, saving time.

[0049] Regarding measurement accuracy, in the clamping mechanism of this invention, the clamping arms can move horizontally along the bidirectional guide rails. The relative distance between the two clamping arms can be precisely adjusted according to the position of the pipe body at the non-measuring end of the pipe joint. Finally, the position of the clamping arms can be locked by the locking element to achieve stable clamping of the pipe body, effectively avoiding errors caused by pipe joint shaking during measurement. At the same time, the contact displacement sensing accuracy is ±0.03mm, and the single-piece detection time is ≤10 seconds (including clamping), which is more than 30 times more efficient than CMM. The displacement sensor collects the circumferential trajectory on the same cross-section and performs precise analysis in conjunction with the data processing module to ensure accurate and reliable measurement results. The hard alloy probe of the displacement sensor has a lifespan of ≥100,000 cycles, avoiding frequent sensor replacements and reducing maintenance costs.

[0050] In terms of versatility, the bidirectional guide rail of this utility model can move up and down along the first guide rail, and the bidirectional guide rail and the first guide rail can be detachably locked together by fasteners. The height of the bidirectional guide rail can be flexibly adjusted to adapt to different specifications of pipe joints. Moreover, the device is suitable for testing pipe joints of various sizes, such as right-angle pipe joints or tee pipe joints, thus expanding its application range.

Claims

1. A universal measuring device for pipe joint misalignment, characterized in that, The pipe fitting is a right-angle pipe fitting or a tee pipe fitting, and the measuring device includes: A V-shaped block (4) is an axisymmetric block structure with a V-shaped top surface, on which the test end tube of the pipe connector is placed; the axis of the test end tube is perpendicular to the center of symmetry of the V-shaped block; A clamping mechanism includes a vertically arranged first guide rail (2) and a bidirectional guide rail (3) that can move up and down along it; the bidirectional guide rail (3) is horizontally arranged and has two clamping arms (8) that can move towards or away from each other along it; the extension direction of each clamping arm (8) is perpendicular to the axial direction of the bidirectional guide rail (3). A measuring mechanism includes a vertically arranged second guide rail (6), which is connected to a measuring arm (10) via a second universal joint (11). The measuring arm (10) is connected to a displacement sensor (5) via a first universal joint (9). The displacement sensor (5) is connected to a data processing module (7). Among them, the two clamping arms (8) are used to clamp the non-measured end of the pipe joint; the displacement sensor (5) is used to contact the outer wall surface of the end pipe to be measured and collect the circumferential trajectory on the same cross section; the data processing module is used to receive the circumferential trajectory and use it to determine whether there is misalignment of the end pipe of the pipe joint to be measured.

2. The universal measuring device for pipe joint misalignment as described in claim 1, characterized in that, The bidirectional guide rail (3) is detachably connected to the first guide rail (2) by fasteners (12).

3. A universal measuring device for pipe joint misalignment as described in claim 1 or 2, characterized in that, Each of the clamping arms (8) is detachably connected to the bidirectional guide rail (3) via a locking element (13).

4. The universal measuring device for pipe joint misalignment as described in claim 3, characterized in that, The second guide rail (6) is a telescopic guide rail.

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