Center-free arc bending radius measuring ruler and bend pipe bending radius measuring method

A technology of bending radius and measurement method, which is applied to measurement devices, mechanical measurement devices, instruments, etc., can solve problems such as difficulty for inspectors and equipment supervisors to grasp and use, poor repeatability of pipeline bending radius, and large randomness. Observation and supervision, easy to grasp, the effect of simple tools

Inactive Publication Date: 2013-08-07
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the laser tracker or three-coordinate measuring instrument is expensive and requires professional operation, it is difficult for general inspectors and equipment supervisors to master and use it.
At the same time, when taking points before computer fitting, there are also artificial points, which are relatively random, which makes the repeatability of the pipe bending radius obtained by different times of computer fitting poor.

Method used

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  • Center-free arc bending radius measuring ruler and bend pipe bending radius measuring method
  • Center-free arc bending radius measuring ruler and bend pipe bending radius measuring method
  • Center-free arc bending radius measuring ruler and bend pipe bending radius measuring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 Shown, a kind of centerless circular arc bending radius measuring ruler of the present invention, it comprises beam 2, left supporting leg 1, right supporting leg 3 and telescopic ruler 4. The crossbeam 2 is arranged horizontally, and the two ends of the crossbeam 2 are respectively symmetrically connected with a left outrigger 1 and a right outrigger 3 , and a telescopic ruler 4 is connected at the center of the crossbeam 2 .

[0033] The left supporting leg 1, the right supporting leg 3 and the telescopic ruler 4 are all perpendicular to the beam 2.

[0034] The left supporting leg 1 and the right supporting leg 3 are equal in length, and the distance W from the left supporting leg 1 and the right supporting leg 3 to the center of the beam 2 is equal;

[0035] Between the left supporting leg 1, the right supporting leg 3 and the crossbeam 2, it can be an adjustable sliding type, or a fixed type.

[0036] There are scale marks on the beam 2 and the t...

Embodiment 2

[0039] A method for measuring the bending radius of an elbow using the centerless circular arc bending radius measuring ruler described in Embodiment 1, see figure 2 with image 3 , when measuring the bending radius of the outer arc of the elbow, see Figure 4 with Figure 5 ;

[0040] Specifically include the following steps:

[0041] (1) On the center line of the inner or outer arc of the elbow, divide the arc length of the center arc from 2 to 20 within the arc length from the bending point at one end to the bending point at the other end (for example: 2, 10 or 20 equal divisions, the specific number of equal divisions can be determined according to the accuracy requirements), forming multiple equal division points; when there is no obvious starting point, the arc length of the mid-arc surface is used instead of from the starting point of one end to the other end The arc length of the mid-arc surface within the arc length of the inflection point;

[0042] (2) Use a ce...

Embodiment 3

[0048] Taking the hot section of a main pipeline of a certain project as an example below, the present invention will be further described in conjunction with the accompanying drawings.

[0049] (1) Use a steel plate to make a simple measuring ruler for arc bending radius without a center, such as Image 6 Said, where W=300mm, E=120mm.

[0050] (2) According to the design drawing of the hot section of the main pipeline, the theoretical design length of the outer arc of the elbow part of the hot section of the main pipeline is calculated to be 1876mm.

[0051] (3) According to the design theoretical arc length, find out the corresponding arc length range on the outer arc of the hot section elbow of the main pipeline, and perform 10 equal divisions to obtain 11 equal division points, as shown in Figure 7 shown.

[0052] (4) Measure the distance L between the center of the beam length and the surface of the hot section A of the main pipe with the simple centerless arc bending ...

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Abstract

The invention provides a center-free arc bending radius measuring ruler and a bend pipe bending radius measuring method. The measuring ruler is respectively connected with a left supporting leg and a right supporting leg symmetrically at both ends of a cross beam; an extension rule is connected at the center of the cross beam; and the extension rule moves up and down along the vertical direction of the cross beam. The measuring method comprises the following steps of: firstly equally dividing the inner arc or outer arc of a bend pipe bending part into a plurality of parts; then respectively measuring the arc heights of partial arc segments by taking each equal diversion point as a beginning point in two directions of the inner arc or outer arc by adopting the center-free arc bending radius measuring ruler; then obtaining the radius of each partial arc segment through calculation; and finally calculating the average value of the radius of each partial arc segment so as to calculate a bend pipe bending radius. The tool has the characteristics of being simple to manufacture, simple to measure, easy to grasp and the like; the position of the circle center of a workpiece is not required to be found out; manual measurement can be carried out; the measuring ruler is convenient to observe and monitor; and the bend pipe bending radius can be measured under any condition of the workpiece.

Description

technical field [0001] The invention relates to a measuring tool and method for mechanical equipment, in particular to a centerless arc bending radius measuring ruler and a method for measuring the bending radius of an elbow. Background technique [0002] At present, the manufacture of large-diameter thick-walled pipe generally adopts intermediate frequency bending, machining forming, hot bending and cold bending. Among them, when the intermediate frequency bending is used, the bending arc of the elbow is naturally formed, and its bending radius is uniform, which is easy to measure accurately, but special intermediate frequency bending equipment is required; when the bending pipe is formed by machining, the bending radius of the elbow is uniform, and the bending radius is easy to measure. Accurate measurement, but the mechanical forming of the elbow also requires special machining equipment, the machining volume is large and the time is long, especially the machining of aust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B5/213
Inventor 施永兵徐臻陈敏张玉邱健关岭松
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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