Hand-held device and method for measuring thickness of whole peripheral wall of pipe

Abstract

The invention relates to the field of thickness measurement tools, in particular to pipe thickness measurement, and specifically relates to a handheld pipe full-circumferential wall thickness measurement device and a measurement method. The device overcomes the problems of low speed and inaccuracy caused by limited measurement range in the measurement of the whole peripheral wall of the pipe in the prior art, can quickly and accurately measure the thickness of the whole peripheral wall of the pipe, improves the measurement efficiency and precision, and provides powerful support for the quality control and performance evaluation of the pipe. The upper part of the side surface of the base is provided with a cantilever support which is transversely distributed, the lower part of the side surface of the base is provided with a measuring anvil rod which is transversely distributed, the outer end of the cantilever support is provided with a dial indicator, the outer end of the measuring anvil rod is provided with a spherical measuring anvil head, and the outer side of the inner end of the measuring anvil rod is sleeved with a rotatable miniature bearing; the lower end of the measuring rod of the dial gauge is provided with a rolling wheel measuring head which is arranged right above the measuring anvil head.

Description

Technical Field

[0001] This invention relates to the field of thickness measurement tools, and in particular to pipe thickness measurement, specifically to a handheld pipe full-circumference wall thickness measurement device and method. Background Technology

[0002] Accurate measurement of pipe wall thickness is crucial for evaluating pipe performance and ensuring safety during pipe manufacturing and use. However, due to the special shape and material properties of pipes, existing wall thickness measurement methods have many limitations. Traditional wall thickness measurement tools include micrometers, ultrasonic thickness gauges, and coordinate measuring machines.

[0003] While micrometers can measure pipe wall thickness to some extent, they typically only measure pipes with an inner diameter larger than the measuring tool, and their measurement range is limited. For example, a micrometer measures wall thickness at a single point on the pipe's sidewall. However, measuring the wall thickness of a circular pipe requires measuring multiple points along the circumference to create a set of data, which is then calculated to obtain the maximum and minimum values. Micrometer measurements require manually selecting multiple points, limiting the measurement range and making the obtained maximum and minimum values ​​prone to inaccuracy. Ultrasonic thickness gauges, on the other hand, provide non-destructive data for measuring circular pipe wall thickness. However, based on experience, they cannot obtain accurate data in a single measurement; multiple measurements at the same point are required to eliminate errors, resulting in a slower measurement process. Summary of the Invention

[0004] This invention provides a handheld device and method for measuring the full circumference wall thickness of pipes, overcoming the problems of slow measurement speed and limited measurement range leading to inaccuracy in the prior art. It can quickly and accurately measure the full circumference wall thickness of pipes, improving measurement efficiency and accuracy, and providing strong support for the quality control and performance evaluation of pipes.

[0005] This invention is achieved through the following technical solution: A handheld pipe wall thickness measuring device includes a base, a cantilever bracket arranged laterally on the upper side of the base, and a measuring anvil rod arranged laterally on the lower side. A dial indicator is provided at the outer end of the cantilever bracket, and a spherical measuring anvil head is provided at the outer end of the measuring anvil rod. A rotatable miniature bearing is sleeved on the outer side of the inner end of the measuring anvil rod. The dial indicator has a rolling roller probe at the lower end of its probe rod, which is located directly above the anvil. A vertically distributed balance bar is located at the inner end of the cantilever bracket. The balance bar moves up and down relative to the cantilever bracket. A guide wheel assembly is located at the lower end of the balance bar, comprising two rotatable unit guide wheels. Miniature bearings Directly above, two unit guide wheels and the miniature bearing are arranged in a triangular pattern.

[0006] Furthermore, the roller probe includes a probe support fixed to the lower end of the probe rod, and a rotatable roller or ball bearing is installed inside the probe support.

[0007] Furthermore, the centerlines of the roller component and the guide wheel assembly are both parallel to the centerline of the miniature bearing.

[0008] Furthermore, the inner end of the cantilever bracket is permeated with vertically distributed oil-free bushings, the balance bar is slidably fitted within the oil-free bushings, and a limiting plate is provided at the upper end of the balance bar.

[0009] Furthermore, a compression spring is fitted onto the balance bar, with the lower end of the compression spring abutting against the top of the guide wheel assembly and the upper section abutting against the bottom side of the cantilever bracket.

[0010] Furthermore, a compression spring is fitted onto the balance bar, with the lower end of the compression spring abutting against the top side of the cantilever bracket and the upper section abutting against the limiting plate.

[0011] Furthermore, the outer end of the cantilever bracket is machined with a through mounting hole, and the bottom of the dial indicator is provided with a connecting cylinder that allows the measuring rod to pass through. The connecting cylinder is assembled in the mounting hole and fixedly connected by a fastening assembly.

[0012] Furthermore, the inner end of the anvil is detachably connected to the lower side of the base.

[0013] Furthermore, the measuring anvil is a steel ball, and the outer surfaces of the steel ball, miniature bearing, and roller are precision ground to a surface roughness Ra≤0.2μm.

[0014] A method for measuring the full circumference wall thickness of a pipe, using the aforementioned handheld pipe full circumference wall thickness measuring device, includes the following steps: S10. Make the roller probe contact the anvil, zero the dial indicator, and then lift the probe rod to separate the roller probe from the anvil. S20. Pick up the pipe to be tested and insert the anvil head and anvil rod into the inner cavity of the pipe. S30. As one end of the tube approaches the inner end of the anvil, lift the balance bar to separate the guide wheel assembly from the miniature bearing, allowing the end of the tube to pass through the gap between the guide wheel assembly and the miniature bearing. Control the balance bar to move downward so that the miniature bearing and the two unit guide wheels of the guide wheel assembly clamp the side wall of the tube end area. Lower the measuring rod so that the roller measuring head and the measuring anvil head clamp the side wall of the middle area of ​​the pipe; S40. Rotate the pipe and read the data using a dial indicator, recording the maximum and minimum values ​​respectively.

[0015] The beneficial effects achieved by this invention compared with the prior art are as follows: 1. This invention employs a design combining a spherical anvil and a roller probe, which allows for a closer fit to the pipe surface, significantly improving the accuracy and reliability of the measurement. The use of a balance bar, guide wheel assembly, and miniature bearings ensures the clamping of the sidewall of the pipe end region, guaranteeing stability during the measurement process. It also allows for smooth circumferential rotation of the pipe, enabling the dial indicator to measure the circumferential wall thickness continuously. This continuous measurement process improves efficiency and accuracy, providing strong support for pipe quality control and performance evaluation. This invention provides a method for measuring the full circumference wall thickness of pipes, which can continuously measure the wall thickness of pipes in the entire circumference. The pipe is rotated, and data is read by a dial indicator. The maximum and minimum values ​​are recorded respectively. The measurement efficiency is high and the measurement results are accurate. 2. The cantilever bracket and the measuring anvil are fixed parallel to each other on one side of the base. The measuring anvil adopts a detachable connection design, which can adapt to pipes of different shapes and sizes, overcome the shortcomings of the limited measurement range of traditional measuring tools, and improve the versatility and flexibility of measurement. 3. The balance bar controls the guide wheel assembly and the miniature bearing to clamp the side wall of the pipe end area. The two unit guide wheels of the miniature bearing and guide wheel assembly clamp the side wall of the pipe end area, thereby fixing the end of the pipe. The middle measurement area is pressured by the roller probe of the dial indicator to ensure the stability of the sample and effectively prevent irregular shaking of the sample during the measurement process, which would lead to measurement instability. 4. The design of mounting a roller probe at the lower end of the dial indicator's probe makes the measurement data more intuitive and accurate, facilitating recording and analysis, and improving the accuracy and efficiency of the measurement. 5. The present invention has a reasonable structural design, with tight fit between the various components, and is simple and convenient to operate. It is particularly suitable for daily rapid measurement and on-site testing, and solves the problems of long measurement time and inconvenience of carrying some special measuring tools. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the handheld pipe full-circumference wall thickness measuring device described in Example 1; Figure 2 This is a schematic diagram of the roller probe described in Example 1; Figure 3 This is a side view of the guide wheel assembly described in Example 1; Figure 4 This is a schematic diagram of the handheld pipe full-circumference wall thickness measuring device described in Example 2; In the diagram: 1. Base; 2. Cantilever bracket; 3. Anvil; 4. Dial indicator; 41. Connecting cylinder; 42. Measuring rod; 5. Anvil head; 6. Miniature bearing; 7. Roller probe; 71. Probe support; 72. Roller assembly; 8. Balance bar; 81. Limiting plate; 82. Compression spring; 9. Guide wheel assembly. Detailed Implementation The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0017] In the description of the invention, it should be understood that the terms "front", "rear", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention. Example 1 like Figure 1-2 As shown, this embodiment discloses a handheld pipe circumference wall thickness measuring device, including a base 1, a cantilever bracket 2, a measuring anvil 3, a dial indicator 4, and a balance bar 8. The base 1 is made of aluminum alloy and the surface is anodized, which has good wear resistance and corrosion resistance. The base 1 allows for a weight reduction hole in the middle for easy hand gripping, and a heat insulation layer is installed in the hand grip area.

[0018] A horizontally distributed cantilever bracket 2 is installed on the upper side of the base 1, and a horizontally distributed anvil rod 3 is installed on the lower side. The cantilever bracket 2 and the anvil rod 3 are arranged parallel to each other vertically. The cantilever bracket 2 and the base 1 can be manufactured as a single piece, while the inner end of the anvil rod 3 is detachably connected to the lower side of the base 1. This design facilitates the replacement of anvil rods 3 of different specifications. For quick assembly and disassembly, a connector can be machined at the inner end of the anvil rod 3, and the connector of the anvil rod 3 can be fixed to the lower side of the base 1 by threaded connection or plug-in connection.

[0019] The anvil 3 is made of high-strength alloy steel, with a length of 30-40mm and a diameter of 3-5mm. A spherical anvil head 5 is machined at the outer end of the anvil 3. In this embodiment, the anvil head 5 is a steel ball with a diameter greater than or equal to 6mm. A rotatable miniature bearing 6 is fitted on the outer side of the inner end of the anvil 3. In this embodiment, the miniature bearing 6 has an outer diameter greater than or equal to 6mm and less than 9mm. The outer surfaces of the steel ball and the bearing are precision ground, with a surface roughness Ra≤0.4μm. Because the anvil 3 is detachably connected to the base 1, it is easy to replace steel balls and bearings of different diameters, adapting to pipes of different shapes and sizes. This overcomes the limitation of traditional measuring tools in terms of measurement range, improving the versatility and flexibility of measurement.

[0020] The dial indicator 4 is a high-precision dial indicator with a graduation of 0.02 mm and a maximum range of 25.4 mm. The lower part of the dial indicator 4 has a vertically movable measuring rod 42, with the centerline of the dial indicator and the centerline of the measuring rod collinear. A through-hole is machined at the outer end of the cantilever bracket 2. A connecting cylinder 41, allowing the measuring rod to pass through, is located at the bottom of the dial indicator 4. The connecting cylinder 41 is fitted into the mounting hole and secured using fastening components. A roller probe 7 is mounted at the lower end of the measuring rod 42 of the dial indicator 4. The roller probe 7 includes a probe support 71 fixed to the lower end of the measuring rod. A rotatable roller component 72 or ball bearing is mounted on the lower part of the probe support 71 via a shaft. The axis of the roller component 72 is parallel to the axis of the miniature bearing 6. The roller component 72 is made of hard alloy material. The diameter of the roller component 72 is 8-10mm and the width is 9-12mm. The surface of the roller component 72 is precision ground and the surface roughness Ra≤0.2μm. The roller component 72 can roll on the surface of the sample when the sample is rotated.

[0021] The stabilizer bar 8 is made of carbon steel, with a length of 50-60mm and a diameter of 8-10mm. Vertically distributed oil-free bushings penetrate the inner end of the cantilever bracket 2, allowing the stabilizer bar 8 to slide within these bushings. The stabilizer bar 8 moves vertically relative to the cantilever bracket 2. A limit plate 81 is machined at the upper end of the stabilizer bar 8, and a guide wheel assembly 9 is bolted to the lower end of the stabilizer bar 8. Figure 3 As shown, the guide wheel assembly 9 includes two rotatable unit guide wheels, and the guide wheel assembly 9 is located at... Miniature bearings Directly above 6, two unit guide wheels are arranged in a triangular pattern with the miniature bearing. A compression spring 82 is fitted on the balance bar 8, with the lower end of the compression spring 82 abutting against the top of the guide wheel assembly 9 and the upper section abutting against the bottom side of the cantilever bracket 2. Under the action of the compression spring 82, the balance bar 8 enables the guide wheel assembly 9 to abut against the surface of the miniature bearing.

[0022] A pipe is taken as a sample, and the circumferential wall thickness of the middle region of the pipe is measured to obtain the maximum and minimum values. Based on the above-mentioned handheld pipe full circumferential wall thickness measuring device, this embodiment discloses a handheld pipe full circumferential wall thickness measuring method, including the following steps: S10. Make the roller probe 7 contact the anvil head 5, zero the dial indicator 4, and then lift the measuring rod to separate the roller probe 7 from the anvil head 5. S20. Pick up the pipe to be tested and insert the anvil head 5 and the anvil rod 3 into the inner cavity of the pipe. S30. As one end of the pipe approaches the inner end of the anvil rod 3, lift the balance rod 8 to separate the guide wheel assembly 9 from the miniature bearing 6, so that the end of the pipe passes through the gap between the guide wheel assembly 9 and the miniature bearing 6. Under the action of the compression spring 82, control the balance rod 8 to move downward so that the two unit guide wheels of the miniature bearing 6 and the guide wheel assembly 9 clamp the side wall of the pipe end area. Lower the measuring rod so that the roller measuring head 7 and the measuring anvil head 5 clamp the side wall of the middle area of ​​the pipe; In this step, the balance bar controls the guide wheel assembly and the miniature bearing to clamp the side wall of the tube end area, thereby fixing the end of the tube. The middle measurement area is pressured by the roller probe of the dial indicator to ensure the stability of the sample and effectively prevent irregular shaking of the sample during the measurement process from causing measurement instability. S40. Rotate the pipe and read the data through dial indicator 4. The wall thickness can be continuously measured throughout the circumference, and the maximum and minimum values ​​can be recorded respectively.

[0023] The above-described handheld pipe wall thickness measurement method allows for continuous measurement of the pipe wall thickness in the entire circumference. By rotating the pipe and reading the data using a dial indicator, the maximum and minimum values ​​are recorded. This method offers high measurement efficiency and accurate results.

[0024] Example 2 like Figure 4 As shown, this embodiment discloses a handheld pipe full circumference wall thickness measuring device. Unlike embodiment 1, a compression spring 82 is sleeved on the balance bar 8. The lower end of the compression spring 82 abuts against the top side of the cantilever bracket 2, and the upper end abuts against the limiting plate 81.

[0025] When using the aforementioned handheld pipe circumference wall thickness measuring device, when one end of the pipe approaches the inner end of the anvil rod 3, the balance rod 8, under the action of the compression spring, causes the guide wheel assembly 9 to automatically separate from the miniature bearing 6, allowing the end of the pipe to pass through the gap between the guide wheel assembly 9 and the miniature bearing 6. Pressing the balance rod with your finger causes it to move downwards, allowing the miniature bearing 6 and the guide wheel assembly 9 to clamp the side wall of the pipe end area, making it more convenient to use.

Claims

1. A handheld pipe wall thickness measuring device, comprising a base (1), wherein a cantilever bracket (2) is provided on the upper side of the base (1) and a measuring anvil (3) is provided on the lower side, and a dial indicator (4) is provided at the outer end of the cantilever bracket (2), characterized in that, The outer end of the anvil rod (3) is provided with a spherical anvil head (5), and the inner end of the anvil rod (3) is fitted with a miniature bearing (6). The dial indicator (4) has a rolling roller probe (7) at the lower end of its measuring rod. The roller probe (7) is located directly above the anvil head (5). A vertically distributed balance bar (8) is located at the inner end of the cantilever bracket (2). The balance bar (8) moves up and down relative to the cantilever bracket (2). A guide wheel assembly (9) is located at the lower end of the balance bar (8). The guide wheel assembly (9) includes two rotatable unit guide wheels. The guide wheel assembly (9) is located at... Miniature bearings (6) Directly above, the two unit guide wheels and the micro bearing are arranged in a triangular pattern.

2. The handheld pipe full-circumference wall thickness measuring device according to claim 1, characterized in that, The roller probe (7) includes a probe support (71) fixed at the lower end of the probe rod, and a rotatable roller component (72) or ball bearing is installed inside the probe support (71).

3. The handheld pipe full-circumference wall thickness measuring device according to claim 2, characterized in that, The axis of the roller (72) and the guide wheel assembly (9) are both parallel to the axis of the roller assembly (72). Miniature bearings (6) The axis of the axis.

4. The handheld pipe full-circumference wall thickness measuring device according to claim 3, characterized in that, The inner end of the cantilever bracket (2) is permeated with vertically distributed oil-free bushings, the balance bar (8) is slidably fitted inside the oil-free bushings, and the upper end of the balance bar (8) is provided with a limiting plate (81).

5. The handheld pipe full-circumference wall thickness measuring device according to claim 4, characterized in that, A compression spring (82) is fitted on the balance bar (8). The lower end of the compression spring (82) abuts against the top of the guide wheel assembly (9), and the upper part abuts against the bottom side of the cantilever bracket (2).

6. The handheld pipe full-circumference wall thickness measuring device according to claim 4, characterized in that, A compression spring (82) is fitted on the balance bar (8). The lower end of the compression spring (82) abuts against the top side of the cantilever bracket (2), and the upper end abuts against the limiting plate (81).

7. The handheld pipe full-circumference wall thickness measuring device according to claim 4, characterized in that, The outer end of the cantilever bracket (2) is machined with a through mounting hole. The bottom of the dial indicator (4) is provided with a connecting cylinder (41) that allows the measuring rod to pass through. The connecting cylinder (41) is assembled in the mounting hole and fixedly connected by a fastening assembly.

8. The handheld pipe full-circumference wall thickness measuring device according to claim 7, characterized in that, The inner end of the anvil (3) is detachably connected to the lower side of the base (1).

9. The handheld pipe circumference wall thickness measuring device according to any one of claims 2-8, characterized in that, The anvil (5) is a steel ball, and the outer surfaces of the steel ball, the miniature bearing (6) and the roller (72) are precision ground, with a surface roughness Ra≤0.2μm.

10. A method for measuring the full circumference wall thickness of a pipe, characterized in that, Measuring pipe thickness using the handheld pipe full-circumference wall thickness measuring device according to any one of claims 1-9 includes the following steps: S10. Make the roller probe (7) contact the anvil (5), zero the dial indicator (4), and then lift the probe rod to separate the roller probe (7) from the anvil (5). S20. Pick up the pipe to be tested and insert the anvil (5) and the anvil rod (3) into the inner cavity of the pipe. S30. As one end of the pipe approaches the inner end of the anvil rod (3), lift the balance rod (8) to separate the guide wheel assembly (9) from the miniature bearing (6), so that the end of the pipe passes through the gap between the guide wheel assembly (9) and the miniature bearing (6), and control the balance rod (8) to move downward so that the two unit guide wheels of the miniature bearing (6) and the guide wheel assembly (9) clamp the side wall of the pipe end area. Lower the measuring rod so that the roller measuring head (7) and the measuring anvil head (5) clamp the side wall of the middle area of ​​the pipe; S40. Rotate the pipe and read the data using a dial indicator (4). Record the maximum and minimum values ​​respectively.

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