Tool for rapidly measuring inner diameter of seamless steel pipe

Abstract

The utility model relates to the technical field of pipeline measurement, in particular to a rapid measuring tool for the inner diameter of a seamless steel pipe. The device comprises a measuring main body, the measuring main body is provided with a plurality of groups of miniature laser ranging heads, the outer sides of the two end parts of the measuring main body are rotatably provided with rotating wheels through bearings respectively, one end of the measuring main body is connected with a connecting rod, the connecting rod is connected with an angle calibration plate which is perpendicular to the connecting rod, and the connecting rod is connected to the central position of the angle calibration plate; the measuring tool is simple in structure, uses laser to measure the inner diameter of the steel pipe, is simple and rapid in measurement, and does not need a power structure for driving; the measuring tool is provided with the angle calibration plate, so that the angle calibration plate can assist in calibrating the placement angle of the tool during lying type measurement and can also be directly used as a placement tool during vertical measurement, and the operation is simple and efficient; according to the measuring tool, the magnet block is arranged on the angle calibration plate, the angle calibration plate is assisted by magnetic force to fix the position, and the stable state in the measuring process is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline measurement technical field, concretely relates to a seamless steel pipe inner diameter quick measurement tool. BACKGROUND

[0002] With the development of industrial manufacturing and building engineering, the quality requirement of pipe material is higher and higher, especially in the production of seamless steel pipe such as special pipe material, the inner diameter precision of steel pipe directly influences the performance and safety of system.

[0003] The traditional inner diameter measurement method usually relies on mechanical measuring tools, such as caliper or inner diameter gauge. These tools need manual operation when using, are limited by the skills and experience of operators, and factors such as dirt on the inner wall of the pipeline and wear of the head of the graduated scale can cause low measurement efficiency and large error. UTILITY MODEL CONTENT

[0004] The utility model aims at the defects and insufficient of prior art, provides a seamless steel pipe inner diameter quick measurement tool with reasonable design, which can solve the above defects.

[0005] In order to achieve the above object, the utility model adopts the following technical scheme: it contains the measurement main part, is equipped with a plurality of miniature laser range finder heads on the measurement main part, the outer side of the both ends of the measurement main part is rotatably installed with a rotating wheel through the bearing respectively, one end of the measurement main part is connected with the connecting rod, the connecting rod is connected with the angle calibration plate which is arranged perpendicularly, and the connecting rod is connected to the center position of the angle calibration plate.

[0006] Preferably, each group of the miniature laser range finder heads contains three miniature laser range finder heads arranged along the circumference of the measurement main part.

[0007] Preferably, the included angle between adjacent range finder heads in each group of the miniature laser range finder heads is 120 DEG.

[0008] Preferably, a plurality of counterweights are connected below the measurement main part.

[0009] Preferably, recesses are opened at the both ends of the outer side of the angle calibration plate, and magnet blocks are movably arranged in the recesses, and the recesses and magnet blocks at the both ends of the angle calibration plate are symmetrically arranged.

[0010] Preferably, a handle is arranged on the angle calibration plate.

[0011] Preferably, buckle grooves are opened at the both sides of the recess.

[0012] After adopting the above structure, the utility model has the beneficial effects that:

[0013] 1. The measurement tool has simple structure, uses laser to measure the inner diameter of steel pipe, and is simple and fast in measurement without power structure driving.

[0014] 2. The angle calibration plate is installed on the measuring tool, which can assist in calibrating the placement angle of the tool when lying down measurement, and can also be directly used as a tool for placing when vertical measurement, which is simple and efficient to operate.

[0015] 3. The measuring tool is provided with a magnet block on the angle calibration plate, which uses magnetic force to assist the angle calibration plate in position fixing, so as to ensure the stability in the measurement process. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a front side structure schematic view of the utility model;

[0017] Figure 2 is a structure side view of the utility model;

[0018] Figure 3 is a simple schematic view of the distance measuring principle of the miniature laser ranging head in the utility model.

[0019] BRIEF DESCRIPTION OF DRAWINGS

[0020] 1, measuring body; 2, rotating wheel; 3, miniature laser ranging head; 4, counterweight; 5, connecting rod; 6, angle calibration plate; 7, handle; 8, magnet block; 9, buckle groove. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0022] Referring to Figures 1-2 As shown in the figure, it comprises a measuring body 1, a plurality of miniature laser ranging heads 3 are arranged on the measuring body 1, rotating wheels 2 are rotatably installed on the outer sides of the two end portions of the measuring body 1 through bearings, a connecting rod 5 is connected to one end of the measuring body 1, an angle calibration plate 6 is arranged perpendicularly on the connecting rod 5, and the connecting rod 5 is connected to the center position of the angle calibration plate 6;

[0023] Each group of miniature laser ranging heads 3 comprises three miniature laser ranging heads 3 arranged along the circumference of the measuring body 1, and the included angle between adjacent ranging heads in each group of miniature laser ranging heads 3 is 120°;

[0024] A plurality of counterweights 4 are connected below the measuring body 1;

[0025] The angle calibration plate 6 has grooves at both ends of its outer side, and a magnet 8 is movably installed in the groove. The grooves and magnets 8 at both ends of the angle calibration plate 6 are symmetrically arranged, and a buckle 9 is opened on both sides of the groove. The angle calibration plate 6 is equipped with a handle 7.

[0026] The principle and usage process of this utility model:

[0027] During measurement, if the steel pipe is laid down, the magnet 8 can be removed first. Grasp the connecting rod 5 and push the measuring tool along the pipe opening, ensuring the inner side of the angle calibration plate 6 is against the side wall edge of the steel pipe. The measuring body 1, once inside the steel pipe, will automatically maintain its angle due to the counterweight 4. Simultaneously, each rotating wheel 2 can rotate independently, allowing the tool to automatically align its angle, making the axis of the measuring body 1 parallel to the axis of the steel pipe. At the same time, the user can judge the fit between the angle calibration plate 6 and the steel pipe opening. If the inner side of the angle calibration plate 6 is in contact with the edge of the steel pipe or both sides maintain the same gap, and the measuring body 1 is perpendicular to the angle calibration plate 6, and the horizontal plane of the pipe opening is perpendicular to the pipe, then the tool is confirmed to be installed correctly. If not, the user can fine-tune it using the handle 7, or insert the magnet 8 into the groove. The magnet 8, through the angle calibration plate 6, will attract the steel pipe backward, thus assisting in position correction.

[0028] When measuring shorter steel pipe samples, the pipe can be erected, and then the tool can be placed vertically inside the pipe, so that the angle calibration plate is placed horizontally above the opening of the pipe. Under the action of gravity, the tool can maintain a vertical posture without additional adjustment.

[0029] After the measurement begins, each set of miniature laser rangefinders 3 measures the distance between itself and the pipe wall. Since the installation position of the miniature laser rangefinder 3 is fixed, the distance between its head and the axis of the measuring body 1 is also fixed. By adding the distance measured by each set to the axis distance, the distance between the axis of the measuring body 1 and the pipe wall at the angle where the miniature laser rangefinder 3 is located can be obtained.

[0030] like Figure 3 As shown, point P is the axis of the measuring body 1 where the single set of miniature laser rangefinder 3 is located. The measurement points on the pipe wall by the laser of the miniature laser rangefinder 3 are points A, B, and C. The corresponding distances AP, BP, CP, AB, AC, and BC are denoted as α, β, γ, f, d, and e. The circular shape of the steel pipe is O, and the radius is r. Then the inner diameter of the steel pipe to be measured is 2r.

[0031] Since the angle between AP, BP, and CP is 120°, according to the Law of Cosines:

[0032] c 2 =a2 +b 2 -2abcos(c)

[0033] Thus, the value of d can be obtained

[0034] Similarly, the values of d and e can be obtained

[0035] According to the formula of the radius of the circumscribed circle of a triangle:

[0036] (where ).

[0037] Thus, the value of d can be obtained

[0038] Further

[0039] Simplifying, we have

[0040] Thus, the diameter of the circle O, i.e., the inner diameter of the steel pipe, can be obtained

[0041] Since the micro laser ranging head 3 is provided in multiple groups, each group of micro laser ranging head 3 can measure and calculate the inner diameter of the steel pipe respectively, and the user can perform error checking according to the measurement structure of each group to improve the measurement accuracy.

[0042] It should be understood that the above specific embodiments of the present application are only used for illustrative or explanatory purposes of the principles of the present application, and do not constitute a limitation of the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included in the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all changes and modifications falling within the scope and boundary of the appended claims, or the equivalent forms of such scope and boundary.

Claims

1. A tool for rapidly measuring the inner diameter of a seamless steel pipe, comprising a measuring body (1), characterized in that: The measuring body (1) is equipped with an array of miniature laser rangefinders (3). Rotating wheels (2) are mounted on the outer sides of both ends of the measuring body (1) via bearings. A connecting rod (5) is connected to one end of the measuring body (1). An angle calibration plate (6) is connected to the connecting rod (5) and is perpendicular to it. The connecting rod (5) is connected to the center of the angle calibration plate (6).

2. The tool for quickly measuring the inner diameter of a seamless steel pipe according to claim 1, characterized in that: Each set of miniature laser rangefinders (3) includes three miniature laser rangefinders (3) arranged circumferentially along the measuring body (1).

3. The tool for quickly measuring the inner diameter of a seamless steel pipe according to claim 2, characterized in that: The included angle between adjacent rangefinders in each group of miniature laser rangefinders (3) is 120°.

4. The tool for quickly measuring the inner diameter of a seamless steel pipe according to claim 3, characterized in that: Several counterweights (4) are connected below the measuring body (1).

5. The tool for quickly measuring the inner diameter of a seamless steel pipe according to claim 4, characterized in that: The angle calibration plate (6) has grooves at both ends on the outer side, and magnets (8) are movably arranged in the grooves. The grooves and magnets (8) at both ends of the angle calibration plate (6) are symmetrically arranged.

6. The tool for quickly measuring the inner diameter of a seamless steel pipe according to claim 5, characterized in that: The angle calibration plate (6) is provided with a handle (7).

7. The tool for quickly measuring the inner diameter of a seamless steel pipe according to claim 5, characterized in that: The groove has a notch (9) on each side.

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