Device for measuring full-length curvature of steel pipe

Abstract

The utility model belongs to the technical field of steel pipe curvature measurement, and discloses a steel pipe full-length curvature measuring device, which comprises two same magnetic cushion blocks with arc-shaped bases, a measuring line with scales and a depth gauge, the magnetic cushion blocks with the arc-shaped bases are arranged along the horizontal direction, and the measuring line with scales is arranged on the depth gauge. The upper surface of the magnetic cushion block is arranged in a plane mode, the lower surface of the magnetic cushion block is concavely provided with an arc-shaped adsorption part, and the magnetic cushion block is made of a magnet. The measuring line can be tightened and detachably arranged between the two magnetic cushion blocks arranged at the two horizontal ends of the steel pipe to be detected; the depth gauge can measure the maximum value of the full-length bending degree of the steel pipe along the measuring line. The device is provided with two magnetic cushion blocks with arc-shaped bases, a measuring line with scales and a depth gauge, wherein the magnetic cushion blocks are the same in height. By means of the device and the measuring method, the overall-length bending degree and the local bending degree of all types of round steel pipes can be accurately measured.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel pipe curvature measurement, in particular to a device for measuring the full-length curvature of a steel pipe. Background Art

[0002] Curvature refers to the degree of curvature of long rolled products (profiles, bars, pipes) in the length direction. The maximum value of the chord height of the bend per meter is the curvature per meter; the ratio of the maximum chord height of the full-length bend to the total length is the full-length curvature. The curvature of various types of rolled products is specified in the product standards, such as: GB / T 8163-2018 "Seamless Steel Pipes for Transporting Fluids" stipulates that the full-length curvature of the steel pipe should not exceed 0.15% of the total length of the steel pipe; GB / T 30584-2014 "Seamless Steel Pipes for Crane Booms" stipulates that the curvature of the steel pipe per meter should not exceed 1.5mm, the full-length curvature should not exceed 0.10% of the total length of the steel pipe, and should not exceed 10mm. The curvature index is one of the important indicators of the external dimensions of the steel pipe. The full-length curvature is usually used. Figure 1 The method shown in the figure is used for measurement. In the figure, 1 is the tightened wire / wire, 2 is the steel pipe, and L is the total length of the steel pipe (the meanings of 1, 2 and L in all the following figures are the same as those in the following figures). Figure 1 Same), h is the measured bending of the entire length of the steel pipe.

[0003] However, if the "S" type bent steel pipe is still in accordance with the above Figure 1 If the measurement is performed by the method, the measurement results are as follows Figure 2 shown.

[0004] Depend on Figure 2 It can be seen that due to the existence of the "S"-shaped bend, the actual length of the so-called full-length bend h measured is L1, not the full length L. It is obvious that L1<L.

[0005] In summary, it can be seen that the traditional measurement method has the problem of inaccuracy in measuring the full-length curvature of the "S"-shaped curved steel pipe, that is, the conventional full-length curvature measurement device and measurement method in the prior art cannot meet the use requirements of all types of round pipes, and cannot accurately detect the full-length curvature of the "S"-shaped curved steel pipe, which has an adverse effect on actual detection and construction. Therefore, one or several new "S"-shaped curved steel pipe full-length curvature measurement devices and methods are urgently needed. Summary of the invention

[0006] The utility model aims to overcome the shortcomings of the prior art and provide a device for measuring the full-length curvature of a steel pipe.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A device for measuring the full-length curvature of a steel pipe, the device comprising a magnetic pad with an arc-shaped base, a measuring line with a scale and a depth gauge, the magnetic pad with an arc-shaped base is provided as two identical blocks, the magnetic pad with an arc-shaped base is provided in a horizontal direction, and the upper surface of the magnetic pad is provided in a plane, the lower surface of the magnetic pad is provided with an arc-shaped adsorption part which is concave downward, and the material of the magnetic pad is a magnet;

[0009] The steel pipe to be tested is arranged in the horizontal direction, and two magnetic pads with arc-shaped bases can be detachably adsorbed and fixedly arranged on the upper surface of the horizontal ends of the steel pipe along a straight line, and the steel pipe and the arc-shaped adsorption parts of the magnetic pads are coaxially detachably adsorbed and fixedly arranged together;

[0010] The measuring line can be tightened and detachably arranged between two magnetic pads arranged at both ends of the horizontal direction of the steel pipe to be tested;

[0011] The depth gauge can measure the maximum value of the full-length curvature of the steel pipe along the measuring line.

[0012] Furthermore, the measuring line is a thin line or a steel wire with a scale.

[0013] Furthermore, the width a of the magnetic pad with the arc-shaped base is ≥20 mm, the length b of the magnetic pad is ≥10 mm, and the height c of the magnetic pad is = h1 + 0.5 mm, wherein h1 is the height from the middle position of the arc-shaped adsorption part of the magnetic pad to the upper surface of the magnetic pad.

[0014] Furthermore, h1 is selected from integers of 10, 15, and 20 mm.

[0015] Furthermore, the shape of the magnetic pad is approximately rectangular, and the material of the magnetic pad is a strong magnet.

[0016] Furthermore, the magnetic pad with an arc-shaped base is detachably adsorbed and fixed to the steel pipe by magnetic force, and the magnetic pad with an arc-shaped base is suitable for steel pipes with an outer diameter range of 50 to 1000 mm, with no limit on wall thickness and length.

[0017] The advantages and effects achieved by the utility model are:

[0018] 1. In order to solve the problem of inaccurate measurement of the full-length curvature of "S"-shaped curved steel pipes by traditional measuring methods, the utility model device is provided with two magnetic pads with arc-shaped bases of the same height + a measuring line with scale (thin line / steel wire) + a depth gauge. The utility model device and measuring method can accurately measure the full-length curvature and local curvature of all types of round steel pipes.

[0019] 2. The utility model device arranges a magnetic pad with an arc-shaped base that is approximately a rectangular parallelepiped, and the upper surface of the magnetic pad is designed to be flat, and the lower surface of the magnetic pad is designed to be a downwardly concave arc. The material of the magnetic pad is a strong magnet. This material is selected so that the magnetic pad can be tightly adsorbed to the steel pipe to be tested through the arc surface of the lower surface, which is convenient for installation and disassembly, and improves work efficiency.

[0020] 3. By adjusting the length of the measuring line (thin line / steel wire) between the two magnetic pads of this device, the curvature of pipes of different lengths can be measured to meet the user's measurement requirements for curvatures in different length ranges.

[0021] 4. By appropriately changing the adsorption effect of the pad on other metals, the device can be applied to round tubes made of stainless steel, copper, titanium alloy, aluminum alloy and other materials, which greatly expands the scope of use of the device, not only improves the accuracy of detection, but also brings convenience to the actual measurement work, facilitates measurement, and meets different usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of measuring normal full-length curvature in the prior art;

[0023] Figure 2 It is a schematic diagram of measuring the full-length curvature of an "S"-shaped curved steel pipe in the prior art;

[0024] Figure 3 It is a structural connection diagram of the device of the utility model and a measurement diagram of measuring the full-length curvature of an "S"-shaped curved steel pipe (the depth gauge is omitted);

[0025] Figure 4 for Figure 3 A schematic diagram of a structural connection of a magnetic pad with an arc-shaped base;

[0026] Figure 5 The utility model is a schematic diagram of a device for measuring the full-length curvature of a steel pipe of the utility model for measuring the full-length curvature of an "S"-shaped curved steel pipe. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with specific embodiments. The following embodiments are merely descriptive and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0028] The raw materials used in this utility model, unless otherwise specified, are all conventional commercial products. The methods used in this utility model, unless otherwise specified, are all conventional methods in the field. The quality of each substance used in this utility model is the quality of conventional use. The structures, connection relationships, etc. not described in detail in this utility model can be understood as conventional technical means in the field.

[0029] A device for measuring the full-length curvature of a steel pipe, such as Figures 1 to 5 As shown, the measuring device includes a magnetic pad 3 with an arc-shaped base, a measuring line 1 with a scale and a depth gauge 4. The magnetic pad with an arc-shaped base is set as two identical pieces, and the magnetic pad with an arc-shaped base is set in a horizontal direction, and the upper surface of the magnetic pad is set in a plane, and the lower surface of the magnetic pad is recessed downward to provide an arc-shaped adsorption portion 31. The material of the magnetic pad is a magnet. This material is selected so that the magnetic pad is closely adsorbed with the steel pipe to be tested through the arc surface of the lower surface, which is convenient for installation and disassembly, and improves work efficiency.

[0030] The steel pipe 2 to be tested is arranged in the horizontal direction, and two magnetic pads with arc-shaped bases can be detachably adsorbed and fixedly arranged on the upper surface of the horizontal ends of the steel pipe along a straight line, and the steel pipe and the arc-shaped adsorption parts of the magnetic pads are coaxially detachably adsorbed and fixedly arranged together;

[0031] The measuring line can be tightened and detachably arranged between two magnetic pads arranged at both ends of the horizontal direction of the steel pipe to be tested;

[0032] The depth gauge can measure the maximum value of the full-length curvature of the steel pipe along the measuring line.

[0033] The measuring device comprises a magnetic pad with an arc-shaped base, a measuring line with a scale and a depth gauge. When in use, the steel pipe to be tested is laid flat on the testing stand, and two magnetic pads with an arc-shaped base are fixedly adsorbed on the two ends of the upper surface of the steel pipe to be tested along a straight line. During the adsorption installation, it is necessary to ensure that the middle position of the arc-shaped adsorption part of the magnetic pad is in contact with the outer surface of the steel pipe; the measuring line with a scale is placed in the middle position of the upper surface of the two detachable magnetic pads with an arc-shaped base and is tightened, so that the measuring line with a scale can measure the length L of the steel pipe, and the depth gauge is used to measure the maximum value ht of the full-length curvature of the steel pipe with the magnetic pads along the direction of the measuring line, and then the full-length curvature of the steel pipe with a length of L is obtained by subtracting the height h1 of the magnetic pads.

[0034] By adjusting the length of the measuring line between the two magnetic pads, the curvature of pipes of different lengths can be measured to meet the user's measurement requirements for curvatures in different length ranges.

[0035] In order to solve the problem of inaccurate measurement of the full-length curvature of "S"-shaped curved steel pipes by traditional measuring methods, the utility model device is provided with two magnetic pads with arc-shaped bases of the same height + a measuring line with a scale (thin line / steel wire) + a depth gauge. The utility model device and measuring method can accurately measure the full-length curvature and local curvature of all types of round steel pipes.

[0036] In this embodiment, the measuring line is a thin line / steel wire with a scale, and the thin line / steel wire with a scale has the advantages of easy material search, low cost, and convenient carrying.

[0037] In this embodiment, the width a of the magnetic pad with an arc-shaped base is ≥20 mm, the length b of the magnetic pad is ≥10 mm, and the height c of the magnetic pad is = h1 + 0.5 mm, wherein h1 is the height from the middle position of the arc-shaped adsorption part of the magnetic pad to the upper surface of the magnetic pad.

[0038] The schematic diagram of the magnetic pad with curved base is as follows Figure 3 As shown in the figure, a is the width of the magnetic pad, a ≥ 20mm; b is the length of the magnetic pad, b ≥ 10mm; c is the height of the magnetic pad, c = h1 + 0.5mm; h1 is the height from the middle of the arc base to the upper surface. Preferably, for the convenience of calculation, h1 can be selected as an integer of 10, 15, 20mm. This magnetic pad design has the advantages of small pads, light weight, easy to carry, and a wide range of outer diameters of steel pipes.

[0039] Preferably, the shape of the magnetic pad is approximately rectangular, and the material of the magnetic pad is a strong magnet. This material is selected so that the magnetic pad can be tightly adsorbed to the steel pipe to be tested through the curved surface of the lower surface, which is convenient for installation and disassembly and improves work efficiency.

[0040] In this embodiment, the magnetic pad with an arc-shaped base is detachably adsorbed and fixed to the steel pipe by magnetic force. The magnetic pad with an arc-shaped base is suitable for steel pipes with an outer diameter range of 50 to 1000 mm, with no limit on wall thickness and length.

[0041] The principle of this steel pipe full-length curvature measuring device is:

[0042] The measuring device of the utility model adopts the principle of parallel height compensation, that is, after using a magnetic pad with a height of h1 to measure the full-length curvature ht, the full-length curvature of the steel pipe is obtained by subtracting the compensated height h1, thereby avoiding the disadvantage that the measured full-length curvature is not the "real" full-length curvature due to the existence of the "S" bend in conventional measurement.

[0043] The method for measuring the full-length curvature of a steel pipe by the full-length curvature measuring device of the steel pipe comprises the following steps:

[0044] 1. Lay the steel pipe to be tested flat on the test bench. The steel pipe can be rolled in a circular direction and fixed at both ends with wooden wedge-shaped pads;

[0045] 2. Fix the magnetic pad 3 with an arc-shaped base (the height of the magnetic pad is h1) along a straight line and adsorb it on both ends of the upper surface of the steel pipe to be tested. During the adsorption installation, ensure that the middle position of the arc-shaped adsorption part of the magnetic pad is in contact with the outer surface of the steel pipe;

[0046] 3. The measuring line 1 can be detachably placed in the middle of the upper surface of two magnetic pads with arc-shaped bases, and both ends are tightened;

[0047] 4. Use the depth gauge 4 to measure along the measuring line to measure the maximum value ht of the full-length bending of the steel pipe with magnetic pads;

[0048] 5. The full-length curvature of the steel pipe is the difference between the maximum full-length curvature ht of the steel pipe with the magnetic pad and the height of the magnetic pad h1, that is, h = ht-h1;

[0049] 6. Rotate the steel pipe circumferentially and measure the full-length curvature of the steel pipe in different circumferential directions multiple times according to the above steps 2-5. The maximum value of these measurements is the full-length curvature of the steel pipe.

[0050] The results of measuring the full-length curvature of the "S"-shaped curved steel pipe using the device and measurement method of the utility model are as follows: Figure 5 shown.

[0051] Test example 1: Normal bending steel pipe

[0052] Seamless steel pipe specifications: Φ219.1mm×12.7mm×11850mm

[0053] The full-length curvature of the steel pipe measured by conventional methods is 12.0 mm;

[0054] The full-length curvature of the steel pipe measured by the utility model device is 11.9 mm.

[0055] Taking into account the measurement error, the two results are almost the same, indicating that the device of the utility model is applicable to normal bending of steel pipes.

[0056] Test example 2: “S” bent steel pipe

[0057] Seamless steel pipe specifications: Φ406.4mm×13mm×10450mm

[0058] The full-length curvature of the steel pipe measured by conventional methods is 8.0 mm;

[0059] The full-length curvature of the steel pipe measured by the utility model device is 10.5 mm.

[0060] The reason is that there is an "S" bend at about 2 meters at one end of the steel pipe. The full-length curvature of the steel pipe measured by the conventional method is only about 8.5 meters, not the actual length of 10450mm. This shows that the device of the utility model can more accurately measure the full-length curvature of the "S" curved steel pipe.

[0061] Although the embodiments of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments.

Claims

1. A device for measuring the full-length curvature of a steel pipe, characterized in that: The measuring device comprises a magnetic pad with an arc-shaped base, a measuring line with a scale and a depth gauge, wherein the magnetic pad with an arc-shaped base is provided as two identical pieces, the magnetic pad with an arc-shaped base is provided in a horizontal direction, and the upper surface of the magnetic pad is provided in a plane, and the lower surface of the magnetic pad is provided with an arc-shaped adsorption part which is concave downward, and the material of the magnetic pad is a magnet; The steel pipe to be tested is arranged in the horizontal direction, and two magnetic pads with arc-shaped bases can be detachably adsorbed and fixedly arranged on the upper surface of the horizontal ends of the steel pipe along a straight line, and the steel pipe and the arc-shaped adsorption parts of the magnetic pads are coaxially detachably adsorbed and fixedly arranged together; The measuring line can be tightened and detachably arranged between two magnetic pads arranged at both ends of the horizontal direction of the steel pipe to be tested; The depth gauge can measure the maximum value of the full-length curvature of the steel pipe along the measuring line.

2. The device for measuring the full-length curvature of a steel pipe according to claim 1, characterized in that: The measuring line is a thin line or a steel wire with scales.

3. The device for measuring the full-length curvature of a steel pipe according to claim 1, characterized in that: The width a of the magnetic pad with an arc-shaped base is ≥20 mm, the length b of the magnetic pad is ≥10 mm, and the height c of the magnetic pad is = h1 + 0.5 mm, wherein h1 is the height from the middle position of the arc-shaped adsorption part of the magnetic pad to the upper surface of the magnetic pad.

4. The device for measuring the full-length curvature of a steel pipe according to claim 3, characterized in that: The h1 is selected from integers of 10, 15, and 20 mm.

5. The device for measuring the full-length curvature of a steel pipe according to claim 3, characterized in that: The shape of the magnetic pad is approximately rectangular, and the material of the magnetic pad is a strong magnet.

6. The device for measuring the full-length curvature of a steel pipe according to any one of claims 1 to 5, characterized in that: The magnetic pad with an arc-shaped base is detachably adsorbed and fixed to the steel pipe by magnetic force. The magnetic pad with an arc-shaped base is suitable for steel pipes with an outer diameter range of 50 to 1000 mm, with no limit on wall thickness and length.

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