Pipeline welded junction assembly alignment tolerance measuring tool

Abstract

The invention belongs to a measuring tool, and particularly relates to a pipeline welded junction assembly alignment tolerance measuring tool. The pipeline welded junction assembly alignment tolerance measuring tool comprises a digital display dial indicator, a dial indicator support arranged below the digital display dial indicator, a dial indicator vertical auxiliary rod arranged on the side wall of the dial indicator support, and a movable measuring rod and a fixed measuring rod arranged below the dial indicator support. The invention has the following remarkable effects: (1) the structure is simple, the manufacture is convenient, and the mass production can be realized; (2) the device is convenient to use, and parts are convenient to disassemble and replace; (3) the method is wide in application, can be widely applied to the assembly alignment tolerance measurement of industrial pipeline weld joints, and is suitable for the assembly alignment tolerance measurement of weld junctions with various wall thicknesses and groove forms; and (4) the construction quality and efficiency can be improved, and the labor force is reduced.

Description

Technical Field

[0001] The invention belongs to a measuring tool, and in particular relates to a tool for measuring the misalignment of a pipeline weld group. Background Art

[0002] Nuclear power plant pipeline welding has high requirements for weld joint assembly quality. When welding joints, excessive misalignment of the blunt edge of the groove may cause poor fusion at the root of the weld. Therefore, it is necessary to accurately measure and control the amount of misalignment of the blunt edge of the weld joint when welding joints. For example, when implementing narrow gap mechanized welding of the main pipeline of a nuclear power plant, the misalignment of the blunt edge of the weld joint assembly is required to be ≤1.5mm and the gap of the blunt edge assembly is ≤1mm. When implementing manual welding of the surge pipe of a nuclear power plant, the misalignment of the blunt edge of the weld joint assembly is required to be ≤0.5mm and the gap of the blunt edge assembly is 1 to 4mm.

[0003] The outer bevel and blunt edge gap of the narrow gap mechanized welding of the main pipeline of a nuclear power plant are relatively narrow, and there is no suitable misalignment measurement tool. However, the inner diameter of the main pipeline is large and personnel can crawl in. Therefore, when measuring the weld gap, personnel usually enter the main pipeline and use a depth vernier caliper to measure the internal misalignment of the weld. For small and medium-sized pipes such as surge pipes, personnel cannot enter the interior. When manual welding is used, due to the large blunt edge gap, a high and low gauge misalignment ruler can be used to insert into the pipe from the blunt edge gap to measure the internal misalignment. The measurement accuracy of the high and low gauge misalignment ruler is low. If narrow gap mechanized welding is implemented for small and medium-sized pipes, there is currently no reliable and high-precision measurement tool in China.

[0004] In summary, the previous pipeline weld misalignment measurement technology has the following limitations:

[0005] 1) For large-diameter pipelines that personnel can enter, if narrow-gap mechanized welding is used, personnel need to enter the pipeline to measure the weld misalignment data. The pipeline equipment is a confined space operation, and it is necessary to apply for relevant work tickets, ventilation and oxygen measurement, and change jumpsuits. Therefore, the construction operation is more troublesome and time-consuming, there are safety risks, and the construction environment is harsh, which also increases the risk of internal damage to nuclear-grade pipelines.

[0006] 2) The accuracy of the misalignment measurement tool is low and cannot meet the measurement requirements of the misalignment of narrow gap welds;

[0007] 3) There is no reliable, accurate and easy-to-use misalignment measurement tool in China. Summary of the invention

[0008] Aiming at the defects of the prior art, the present invention provides a tool for measuring the misalignment of a pipe weld group.

[0009] The present invention is implemented as follows: a pipeline weld group misalignment measurement tool, which includes a digital dial indicator, a dial indicator bracket is arranged below the digital dial indicator, a dial indicator vertical auxiliary rod is arranged on the side wall of the dial indicator bracket, and a movable measuring rod and a fixed measuring rod are arranged below the dial indicator bracket.

[0010] The above-mentioned pipeline weld joint group misalignment measurement tool also includes a dial indicator zeroing calibration block.

[0011] A pipeline weld assembly misalignment measurement tool as described above, wherein the dial indicator bracket includes a bracket, a dial indicator vertical auxiliary rod pressure plate is arranged on the side wall of the bracket, the dial indicator vertical auxiliary rod pressure plate and the bracket have corresponding grooves, and a dial indicator top screw and a fixed measuring rod top screw are also arranged on the bracket respectively.

[0012] A pipe weld assembly misalignment measurement tool as described above, wherein a clamping hole for a dial indicator fixed sleeve rod, a dial indicator measuring rod mounting hole, a movable measuring rod mounting hole, a fixed measuring rod mounting hole, and a dial indicator vertical auxiliary rod slide groove are arranged inside the bracket, wherein the clamping hole, the dial indicator measuring rod mounting hole, and the movable measuring rod mounting hole are coaxially arranged, connected up and down, and their diameters decrease successively; the dial indicator vertical auxiliary rod slide groove is arranged on the side wall of the bracket and is arranged parallel to the axial direction of the movable measuring rod mounting hole, and the fixed measuring rod mounting hole is arranged at the bottom end of the bracket.

[0013] As described above, a tool for measuring the misalignment of a pipe weld assembly is provided, wherein the cross section of the vertical auxiliary rod of the dial indicator is similar to an "I"-shaped part, a sliding head is arranged at the upper end, and the lower cross bar is a reference plate, and the sliding head is fixed in the sliding groove of the bracket through the dial indicator vertical auxiliary rod pressure plate; when the tool is used, the reference plate coincides with the pipe surface to ensure that the tool is perpendicular to the blunt edge when measuring the misalignment, thereby ensuring the measurement accuracy.

[0014] The remarkable effects of the present invention are as follows: (1) the present invention has a simple structure, is easy to manufacture, and can be mass-produced; (2) the present invention is easy to use, and the parts are easy to disassemble and replace; (3) the present invention has a wide range of applications, and can be widely used in the measurement of the misalignment of industrial pipeline weld groups, and is suitable for the measurement of the misalignment of weld groups with various wall thicknesses and groove forms; (4) the present invention can improve the construction quality and efficiency, and reduce labor: the micrometer measurement of the misalignment can make the measurement accuracy of the misalignment reach 0.01mm. After using the present invention, personnel no longer need to enter the interior of the pipeline to measure the misalignment inside the pipe mouth, and the digital display micrometer reading is also faster than other measuring tools, so that the construction quality and efficiency are greatly improved, and the labor intensity of workers is also greatly reduced. (5) The present invention can solve the problem of the difficulty in measuring the misalignment of narrow-gap mechanized welding welds of small and medium-sized pipes, and provide necessary conditions for the application of narrow-gap mechanized welding to small and medium-sized pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 :device for measuring misalignment;

[0016] Figure 2 : Dial indicator bracket;

[0017] Figure 3 : Bracket;

[0018] Figure 4 : movable measuring rod;

[0019] Figure 5 :Fix the measuring rod;

[0020] Figure 6 : Dial indicator verticality auxiliary device;

[0021] Figure 7 : Dial indicator zero calibration block;

[0022] Figure 8 :Application example of zero calibration of the dial indicator of misalignment measurement tool;

[0023] Fig. 9 :Application example of mechanized weld misalignment measurement in narrow gap of main pipeline;

[0024] Fig.10 :Application example of measuring the misalignment of manual welding seams of surge pipes;

[0025] Fig.11 :Application example of mechanized weld misalignment measurement for narrow gap of surge pipe.

[0026] In the figure: 1. digital display dial indicator, 2. dial indicator bracket, 3. movable measuring rod, 4. fixed measuring rod, 5. dial indicator vertical auxiliary rod, 6. dial indicator zero calibration block, 21. bracket, 22. dial indicator top screw, 23. dial indicator vertical auxiliary rod pressure plate, 24. fixing screw, 25. fixed measuring rod top screw, 211. clamping hole of dial indicator fixed sleeve rod, 212. dial indicator own measuring rod mounting hole, 213. movable measuring rod mounting hole, 214. fixed measuring rod mounting hole, 215. dial indicator vertical auxiliary rod slide groove, 51. sliding head, 52. time reference plate. DETAILED DESCRIPTION

[0027] A tool for measuring the misalignment of a pipe weld joint group. The device has a variety of measuring rod lengths to choose from, which can meet the measurement of the misalignment of pipe weld joint groups with various wall thicknesses. The device is suitable for measuring the misalignment of narrow-gap grooves. A device is designed on the device to ensure that the dial indicator is vertical, so as to improve measurement accuracy and reduce errors.

[0028] The misalignment measuring tool mainly consists of: a digital dial indicator 1, a dial indicator bracket 2, a movable measuring rod 3, a fixed measuring rod 4, a dial indicator vertical auxiliary rod 5, and a dial indicator zeroing calibration block 6. Figure 1 As shown. The digital display dial indicator can be purchased as a finished product on the market.

[0029] The dial indicator bracket 2 is composed of: a bracket 21, a dial indicator top screw 22, a dial indicator vertical auxiliary rod pressure plate 23, a fixing screw 24, and a fixed measuring rod top screw 25.

[0030] The internal structure of the support 21 is as follows: Figure 3 As shown: a clamping hole 211 of a dial indicator fixed sleeve rod, a dial indicator measuring rod mounting hole 212, a movable measuring rod mounting hole 213, a fixed measuring rod mounting hole 214, and a dial indicator vertical auxiliary rod slide groove 215.

[0031] Movable measuring rod 3: Movable measuring rods of different lengths can be selected according to the pipe wall thickness.

[0032] Fixed measuring rod 4: movable measuring rods of different lengths can be selected according to the pipe wall thickness.

[0033] Dial indicator verticality auxiliary device 5: The sliding head 51 is fixed in the slide groove of the bracket 21 through the dial indicator vertical auxiliary rod pressure plate 23; when the tool is used, the reference plate 52 coincides with the pipe surface to ensure that the tool is perpendicular to the blunt edge when measuring the misalignment, thereby ensuring measurement accuracy.

[0034] Dial indicator zero calibration block 6: Before using the misalignment measurement tool, it must be calibrated to zero using the dial indicator zero calibration block before using it for measurement.

[0035] Here is a specific example of usage:

[0036] 1) Use the dial indicator zero calibration block 6 to perform zero calibration on the misalignment measurement tool. Figure 8 As shown, place the misalignment measuring tool on the dial indicator zeroing calibration block 6, press down gently so that the heads of the movable measuring rod 3 and the fixed measuring rod 4 are in contact with the calibration block, and at the same time, press down the dial indicator verticality auxiliary device 5 to make it fit with the surface of the calibration block, and then use the zeroing button of the dial indicator on the misalignment measuring tool to return the dial indicator to zero.

[0037] 2) Insert the misalignment measuring tool into the weld, press down gently to make the heads of the movable measuring rod 3 and the fixed measuring rod 4 contact the blunt edges of the grooves on both sides respectively, and at the same time press down the dial indicator verticality auxiliary device 5 to make it linearly fit with the outer surface of the pipe to ensure that the misalignment measuring tool is perpendicular to the blunt edge, thereby ensuring the measurement accuracy.

[0038] 3) Read the dial indicator reading on the misalignment measuring tool, which is the misalignment of the weld.

[0039] Application scenarios: Fig. 9 As shown, the wall thickness of the main pipe is 72mm, and the groove form is a narrow gap mechanized welding groove; Fig.10 As shown, the wall thickness of the surge tube is 36mm, and the groove form is a manual welding groove form; Fig.11 As shown, the wall thickness of the surge tube is 36 mm, and the groove form is a narrow gap mechanized welding groove form.

Claims

1. A tool for measuring the misalignment of a pipe weld, characterized by: The invention comprises a digital dial gauge (1), a dial gauge bracket (2) is arranged below the digital dial gauge (1), a dial gauge vertical auxiliary rod (5) is arranged on the side wall of the dial gauge bracket (2), and a movable measuring rod (3) and a fixed measuring rod (4) are arranged below the dial gauge bracket (2).

2. A pipeline weld joint misalignment measurement tool as claimed in claim 1, characterized in that: Also included is a dial indicator zero calibration block (6).

3. A pipeline weld joint misalignment measurement tool as claimed in claim 2, characterized in that: The dial gauge bracket (2) comprises a bracket (21), a dial gauge vertical auxiliary rod pressure plate (23) is arranged on the side wall of the bracket (21), the dial gauge vertical auxiliary rod pressure plate (23) and the bracket (21) are provided with grooves corresponding to the positions, and a dial gauge top screw (22) and a fixed measuring rod top screw (25) are also respectively arranged on the bracket (21).

4. A pipeline weld joint misalignment measurement tool as claimed in claim 3, characterized in that: The bracket (21) is provided with a clamping hole (211) for a dial gauge fixed sleeve rod, a dial gauge measuring rod mounting hole (212), a movable measuring rod mounting hole (213), a fixed measuring rod mounting hole (214), and a dial gauge vertical auxiliary rod slide groove (215), wherein the clamping hole (211), the dial gauge measuring rod mounting hole (212), and the movable measuring rod mounting hole (213) are coaxially arranged, connected up and down, and their diameters are successively reduced; the dial gauge vertical auxiliary rod slide groove (215) is arranged on the side wall of the bracket (21) and is arranged parallel to the axial direction of the movable measuring rod mounting hole (213), and the fixed measuring rod mounting hole (214) is arranged at the bottom end of the bracket (21).

5. A pipeline weld joint misalignment measurement tool as claimed in claim 4, characterized in that: The cross section of the dial gauge vertical auxiliary rod (5) is similar to an "I"-shaped part, with a sliding head (51) arranged at the upper end and a horizontal rod at the lower end being a reference plate (52). The sliding head (51) is fixed in a slide groove of a bracket (21) through a dial gauge vertical auxiliary rod pressure plate (23); when the tool is used, the reference plate (52) coincides with the surface of the pipe to ensure that the tool is perpendicular to the blunt edge when measuring the misalignment, thereby ensuring measurement accuracy.

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