A hand-held large-diameter segment roundness detection tool

Abstract

The utility model discloses a handheld large diameter cylinder section roundness detection tool, and the tool comprises a main part, the axial width of the main part is less than the maximum width value of handheld article when detecting, a first detection surface is arranged on one side wall surface of the main part, the first detection surface is a circular arc surface, and the diameter of the arc surface is equal to the standard cylinder section inner diameter, a second detection surface is arranged on the other side wall surface of the main part, the second detection surface is a circular arc surface, and the diameter of the arc surface is equal to the standard cylinder section outer diameter. The detection tool is designed with the inner and outer arc curves of the detection tool in the reverse direction of the inner and outer wall diameters of the cylinder section, the fitting degrees of the two are used to judge the curvature precision of the cylinder section, the operation handheld hole is designed by combining with the human engineering operation science, and the tool is convenient to carry and operate, the tool is easy to operate, practical, light in weight, convenient to carry and good in economy.

Description

Technical Field

[0001] This utility model relates to the field of detection technology for the curvature of large cylindrical sections, and in particular to a handheld tool for detecting the roundness of large-diameter cylindrical sections. Background Technology

[0002] Large cylindrical sections are mainly used in fluid transportation, machinery manufacturing, energy transportation, and bridge construction, and are widely applied in petrochemical, construction, transportation, power, and bridge construction fields. For example, in the main body of bridges, large cylindrical sections are mainly used in steel arch bridges and steel tower structures. The diameter and length of the cylindrical sections in steel arch bridges and steel towers are generally between 1m and 4m. The span of steel arch bridges is generally over 100m, and the height of steel towers is around 200m. They are all formed by welding together many cylindrical sections of the same diameter but different lengths to form large-span arch bridges or steel towers.

[0003] Currently, due to difficulties in transporting semi-finished cylindrical sections and insufficient loading rates, these large cylindrical sections are usually rolled in processing plants using three-axis or four-axis pipe rolling equipment. Since the cylindrical sections require butt welding, to avoid assembly difficulties, the rolled sections are typically required to have an ellipticity of no less than D / 500 (D being the outer diameter of the cylindrical section). This places extremely high demands on the rolling precision of the cylindrical sections. While the diameter of the rolled cylindrical sections can be measured with a ruler at both ends, the inner and outer diameters at other locations cannot be measured using traditional tools such as rulers or vernier calipers. Therefore, how to quickly check whether the curvature of the inner and outer walls of the cylindrical section meets the requirements is a problem that urgently needs to be solved. Summary of the Invention

[0004] To address the aforementioned problems, this utility model aims to provide a handheld large-diameter cylindrical section roundness testing tool. This tool addresses the difficulty in detecting the inner and outer diameters of large-diameter cylindrical sections by designing a handheld device through the reverse arrangement of the inner and outer wall radii of the cylindrical section. The device's outline is formed by the intersection of the inner and outer diameter curves of the cylindrical section. It can detect whether the arc and curvature at any position of the cylindrical section meet the requirements using a circumferential baseline set within the section.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A handheld large-diameter cylindrical section roundness testing tool, comprising: a handheld main body, wherein a first testing surface is provided on the outer side of the main body, the first testing surface being an arc surface, and the diameter of the arc surface being equal to the standard inner diameter of the large-diameter cylindrical section; and a second testing surface is provided on the inner side of the main body, the second testing surface also being an arc surface, and the diameter of the arc surface being equal to the standard outer diameter of the large-diameter cylindrical section.

[0006] Preferably, the main body is crescent-shaped, and the outer arc surface of the crescent shape is designated as the first detection surface and the inner arc surface is designated as the second detection surface.

[0007] Preferably, the ends of the first detection surface and the second detection surface are smoothly connected by a rounded surface.

[0008] Preferably, a handheld hole is provided in the center of the main body.

[0009] Preferably, the handheld hole is an arc-shaped hole, which is arranged along the length direction of the main body and has its concave surface facing the inside of the main body.

[0010] Preferably, the arc length of the first detection surface is greater than one-quarter of the arc length of the standard inner diameter of the large-diameter cylinder section; the arc length of the second detection surface is greater than one-quarter of the arc length of the standard outer diameter of the large-diameter cylinder section.

[0011] The beneficial effects of this utility model are: 1) The testing tool is designed with the inner and outer wall diameters of the cylinder in reverse to form the inner and outer arc curves of the testing tool. The accuracy of the cylinder curvature is judged by the fit between the two. At the same time, the tool is designed with a hand-held hole in combination with ergonomics to facilitate carrying and operation. The tool is very easy to operate, practical, lightweight, easy to carry and economical.

[0012] 2) This tool can adapt to different conditions and different sizes of cylinder sections for curvature detection; ordinary operators can use a 2mm feeler gauge and a tape measure to check whether the curvature accuracy of any position of a large cylinder section meets the requirements.

[0013] 3) This tool, in conjunction with the detection method, can detect the curvature accuracy at any position of the cylinder section, which greatly assists in improving the accuracy after the cylinder section is rolled into a circle.

[0014] 4) This tool ensures the roundness of the joints of large steel pipe arch bridge sections. It can also detect the curvature accuracy of the sections before and after welding, thus playing a good role in ensuring the quality control of steel bridge processing. Attached Figure Description

[0015] Figure 1 A baseline diagram is drawn on the flat blank before the current section is rolled.

[0016] Figure 2 This is a schematic diagram of the folding point before the current cylindrical section is rolled up.

[0017] Figure 3 This is a schematic diagram of the current longitudinal seam welding of the cylinder section.

[0018] Figure 4 This is the current cylindrical section return diagram.

[0019] Figure 5 This is a structural diagram of the tool of this utility model.

[0020] Figure 6 This is a schematic diagram of the segmentation detection unit on the cylindrical section of this utility model.

[0021] Figure 7 This is a diagram showing the division of the detection area on the cylindrical section of this utility model.

[0022] Figure 8 This is a schematic diagram of the tool of this utility model for inspecting the inner wall surface of a cylindrical section.

[0023] Figure 9 This is a single circumferential inspection diagram of the inner wall surface of the cylindrical section of this utility model.

[0024] Figure 10 This is a single circumferential inspection diagram of the outer wall surface of the cylindrical section of this utility model.

[0025] Figure 11 This is a schematic diagram of the inspection of the inner wall of the cylinder section and the gap at the circumferential baseline position according to this utility model.

[0026] Figure 12 This is a schematic diagram of the inner wall inspection and gap of the cylindrical section outside the circumferential baseline of this utility model.

[0027] Figure 13 This is a partial enlarged view illustrating the inspection of the inner wall of the cylindrical section and the gap of this utility model.

[0028] Figure 14 This is a schematic diagram of the detection of the outer wall of the cylindrical section and the gap at the circumferential baseline position according to this utility model.

[0029] Figure 15 This is a schematic diagram of the detection of the outer wall of the cylindrical section outside the circumferential baseline and a schematic diagram of the gap in this utility model.

[0030] Figure 16 This is a partial enlarged view illustrating the detection of the outer wall of the cylindrical section and the gap of this utility model.

[0031] In the figure: 1-Main body; 11-First detection surface; 12-Second detection surface; 13-Arc surface; 14-Handheld hole. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] The current manufacturing process for cylindrical sections is roughly as follows: Existing rolling machinery can only roll sections up to a maximum width of 3.5m or less; therefore, the length L of the cylindrical section is generally 3m or less. In actual operation, to ensure that the relevant parameters meet the requirements after rolling, the section is unfolded based on the diameter at its center. According to the aforementioned schematic diagram, the diameter of the cylindrical section is φ(Dt) at the center line position. Therefore, the required rolling width is: B = π × (Dt). A longitudinal baseline and a circumferential transverse baseline are then marked on both sides of the unfolded cylindrical section. The circumferential transverse baseline is perpendicular to the longitudinal baseline (e.g., ...). Figure 1 (As shown).

[0034] Next, using the dimensions after unfolding along the center line as a reference, roll the dough into a circle. Since welding is required after rolling, leave a 200mm margin on both sides before rolling. Fold the dough at the 200mm mark and then roll it into a circle (e.g., ...). Figure 2 (As shown). After rolling, a longitudinal weld is formed. After fixing both sides of the weld, welding is performed (as shown). Figure 3 (As shown). After welding, the weld is inspected, and the cylinder section is rounded back. The main functions of rounding back are: first, to round the corner positions; second, to correct the deformation caused during welding; and third, to further correct the curvature of the cylinder section (such as...). Figure 4 (As shown).

[0035] To rapidly detect the curvature of the inner and outer walls of the aforementioned rolled large cylindrical sections, this application provides a handheld large-diameter cylindrical section roundness detection tool, such as... Figure 5 As shown, the tool includes: The main body 1 is handheld, and its axial width in the detection position is less than the maximum width of the handheld object. The detection position is a detection state in which the tool is held vertically along the radial direction of the cylindrical section. In this state, the operator needs to... Figure 9-10 As shown, the tool is held in a way that the axial width of the main body 1 is smaller than the maximum width of a conventional object held by an operator, allowing the operator to hold the tool firmly and drive the tool's displacement detection. Therefore, the cross-section of the main body 1 of the tool is a small square or rectangular structure.

[0036] To inspect the inner wall of the cylindrical section, a first inspection surface 11 is provided on the outer side of the main body 1. The first inspection surface 11 is located on one side wall of the main body 1 and is an arc surface, the diameter of which is equal to the standard inner diameter of the large-diameter cylindrical section. By holding the main body 1, the first inspection surface 11 is brought into arc-shaped contact with the inner wall surface of the cylindrical section. The curvature at the inspection location of the inner wall surface is determined based on the degree of contact (whether there is a gap). By shifting the tool, the curvature of all parts of the inner wall surface can be inspected.

[0037] Similarly, to inspect the outer wall surface of the cylindrical section, a second inspection surface 12 is provided on the inner side of the main body 1. The second inspection surface 12 is located on the other side wall of the main body 1 and is also an arc surface, with a diameter equal to the standard outer diameter of the large-diameter cylindrical section. By holding the main body 1, the second inspection surface 12 is brought into contact with the arc of the outer wall surface of the cylindrical section. The curvature at the inspection location is determined based on the degree of contact (whether there is a gap). Moving the tool completes the curvature inspection of all parts of the outer wall surface.

[0038] To facilitate tool fabrication and separate inspection of the inner and outer walls of the cylinder section, such as Figure 5 As shown, the main body 1 is crescent-shaped, with the outer arc surface of the crescent shape serving as the first detection surface 11 and the inner arc surface serving as the second detection surface 12. When inspecting the inner and outer wall surfaces, the tool is held on the side of the first detection surface 11 and inspected through the second detection surface 12, and vice versa.

[0039] Because the tool has a short arc and long structure, it needs to be continuously moved to complete the inspection of the entire circumference. Therefore, to avoid obstruction of contact or arc-shaped wear between the ends of the first inspection surface 11 or the second inspection surface 12 and the inner and outer walls of the cylinder section during the movement, such as... Figure 5 As shown, the ends of the first detection surface 11 and the second detection surface 12 are connected by an arc surface 13, which allows the tool to move smoothly along the axial direction.

[0040] When performing curvature testing, the tool must be vertical and aligned with the radial direction of the cylinder section. Therefore, to avoid the problem of the tool's left and right deflection affecting the test results during the inspection process after the first testing surface 11 or the second testing surface 12 of the tool is in contact with the inner and outer walls of the cylinder section, such as... Figure 5 As shown, preferably, the two sides where the first detection surface 11 intersects with the main body 1, and the two sides where the second detection surface 12 intersects with the main body 1, are both right-angled corner structures. The right-angled corner structure ensures that the first detection surface 11 and the second detection surface 12 can adhere to the inner and outer walls of the cylinder section throughout their entire axial width, guaranteeing the contact area and stability. Furthermore, by avoiding contact with the inner and outer walls of the cylinder section, the corners of the right-angled structure, compared to a rounded corner structure, provide frictional resistance during displacement with the inner and outer walls of the cylinder section. This effectively limits the deflection of the tool during cylinder section detection, improving detection quality.

[0041] To facilitate holding the tool, such as Figure 5 As shown, a handheld hole 14 is provided in the center of the main body 1, through which the tool is moved as a whole. The specific gripping method is as follows... Figure 9-10As shown, when inspecting the inner wall of the cylinder section, the entire tool is held from the second inspection surface 12 side through the handheld hole 14, so that the first inspection surface 11 is fully exposed and in complete contact with the inner wall of the cylinder section; when inspecting the outer wall of the cylinder section, the tool is held in the opposite direction. The handheld hole 14 is designed based on the optimal grip of a normal operator's hand after gripping the device. The handheld hole 14 is 20mm away from the first inspection surface 11 and the second inspection surface 12 of the tool, and has R20mm rounded corners at both ends to prevent hand injury during operation.

[0042] To improve the comfort of holding the tool through the handheld port 14, such as Figure 5 As shown, the handheld hole 14 is configured as an arc-shaped hole structure, and the arc-shaped hole is arranged along the length direction of the main body 1, with its concave surface facing the inner side of the main body. This structure makes the arc of the handheld hole 14 similar to that of the first detection surface 11 and the second detection surface 12. Therefore, when the first detection surface 11 and the second detection surface 12 are held respectively, the surface thickness of the handheld hole 14 on both sides of the first detection surface 11 and the second detection surface 12 is basically the same, allowing the operator to hold it firmly.

[0043] To improve detection efficiency, while reducing the weight of the tool and facilitating displacement detection, such as... Figure 9-10 As shown, the arc length of the first detection surface 11 is greater than one-quarter of the standard inner diameter of the large-diameter cylindrical section, and the arc length of the second detection surface 12 is greater than one-quarter of the standard outer diameter of the large-diameter cylindrical section. This arc length allows the tool to connect with the area within the adjacent quadrant of the cylindrical section during a single measurement in the circumferential direction. This enables the curvature detection within the circumference to be completed with only four shift detections on the same circumference, and ensures that two shift detection surfaces connect, avoiding detection gaps.

[0044] The first detection surface 11 and the second detection surface 12 of the tool described in this application are designed in reverse according to the curvature parameters of the inner and outer walls of the standard cylindrical section, thus becoming the parameters of the detection tool. The outer wall radius φD / 2 of the cylindrical section is used as the inner curve radius of the detection device, and the inner wall diameter φd1 / 2 of the cylindrical section is used as the outer curve radius of the detection device. A 10mm radius arc transition is preferably provided at the intersection of the two curves to avoid sharp protrusions that could injure the operator. The tool is preferably 300mm high (vertical height from the end to the center), which is convenient for the operator to hold and ensures lightweight operation. The tool is preferably made of 4mm stainless steel through machining, and its weight is approximately 1.8kg, making it easy to operate.

[0045] The method of using the testing tool disclosed in this utility model is as follows: S1. Draw a circumferential baseline along the length of the large-diameter cylindrical section to divide its inner and outer walls into multiple detection units (e.g., ...). Figure 6(Medium units 1-6), the width of each detection unit is preferably 500mm. Simultaneously, each detection unit is circumferentially divided into four detection zones according to the quadrant points of the circle (e.g., ...). Figure 7 (middle ad zone), and each detection zone is axially delineated with a transverse baseline, and each transverse baseline runs through the cylinder section.

[0046] S2. Roundness inspection of the inner wall of the cylinder section: Starting from one inspection unit, the first inspection surface 11 of the tool is radially flat against the inner wall surface of the cylinder section through the handheld hole 14 (the initial measurement in each unit is based on the circumferential baseline, and both ends of the tool are connected to the adjacent transverse baseline). Based on the contact state between the first inspection surface 11 and the inner wall surface of the cylinder section, the curvature at the current inspection position of the inner wall surface of the cylinder section is determined. Then, it is moved circumferentially to the next inspection area for inspection (when moving axially within a single inspection unit, the front measurement position is used as the reference. After the tool leaves the circumferential baseline, the distance between the upper and lower sides of the tool and the circumferential baselines on both sides can be measured using a measuring ruler to ensure the verticality of the tool). The inspection positions of adjacent inspection areas overlap. After the inspection of four inspection areas is completed, the tool is moved axially to inspect the four inspection areas in the next inspection unit, and the adjacent inspection positions of the tool overlap (and overlap is performed, with an overlap width preferably of 5mm). This continues until the roundness inspection of the inner wall of the cylinder section in all inspection units is completed.

[0047] S3. Roundness detection of the outer wall of the cylinder section. The detection method is basically the same as that of the inner wall of the cylinder section. The difference is that the hand tool is used to make the second detection surface 12 flatly adhere to the outer wall surface of the cylinder section in the radial direction. The curvature at the current detection position of the outer wall surface of the cylinder section is determined based on the adhesion state between the second detection surface 12 and the outer wall surface of the cylinder section.

[0048] When there is a gap between the testing surface of the tool and the inner and outer walls of the cylinder during testing, in order to accurately determine the width of the gap, when the first testing surface 11 / second testing surface 12 of the tool is in contact with the inner and outer walls of the cylinder, a feeler gauge (preferably 2mm thick) is used to test the gap (δ) between the outer wall of the cylinder and the inner side of the testing device. If the feeler gauge cannot be inserted, it is determined that the curvature of the cylinder meets the requirements; otherwise, it does not meet the requirements. After marking, it is corrected by rounding.

[0049] When the inner diameter of the cylinder section is small and it is difficult for the operator to enter to inspect the curvature of the inner wall surface, the curvature of the inner wall surface can be determined by inspecting the curvature of the outer wall surface.

[0050] The principle of this invention is as follows: the inner and outer arcs (first detection surface 11 and second detection surface 12) of the handheld testing tool are designed in opposite directions to the inner and outer walls of the cylindrical section. That is, the radius of the outer arc of the testing tool is the same as the radius of the inner wall of the cylindrical section, and the radius of the inner arc of the testing tool is the same as the radius of the outer wall of the cylindrical section. The size and handhold position are designed in accordance with the optimal handholding posture for human operation. The operator holds the tool on either the first detection surface 11 or the second detection surface 12 and places it on either the inner or outer wall of the cylindrical section. By checking the fit between the two, it can be determined whether the curvature of the inner and outer walls of the cylindrical section meets the requirements, thus quickly completing the curvature detection of the inner and outer walls of large cylindrical sections.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope of protection, and all such changes and modifications fall within the scope of protection claimed by this utility model.

Claims

1. A hand-held large diameter segment roundness tool, characterized by, include: The main body is handheld, and a first detection surface is provided on the outer side of the main body. The first detection surface is an arc surface, and the diameter of the arc surface is equal to the standard inner diameter of the large-diameter cylindrical section. A second detection surface is provided on the inner side of the main body. The second detection surface is also an arc surface, and the diameter of the arc surface is equal to the standard outer diameter of the large-diameter cylindrical section.

2. The tool of claim 1, wherein: The main body is crescent-shaped, with the outer arc surface of the crescent shape serving as the first detection surface and the inner arc surface serving as the second detection surface.

3. The tool of claim 2, wherein: The ends of the first detection surface and the second detection surface are smoothly connected by a rounded surface.

4. A tool according to any one of claims 1 to 3, characterised in that: A handheld hole is provided in the center of the main body.

5. The tool of claim 4, wherein: The handheld hole is an arc-shaped hole, which is arranged along the length of the main body and has its concave surface facing the inside of the main body.

6. The tool according to claim 4, characterized in that: The length of the arc surface of the first detection surface is greater than one-quarter of the arc length of the standard inner diameter of the large-diameter cylinder section; the length of the arc surface of the second detection surface is greater than one-quarter of the arc length of the standard outer diameter of the large-diameter cylinder section.

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