Method of correcting spring hanger scale indicating visual error

Abstract

The application discloses a correction method for visual error of spring support hanger scale indication, which comprises the following steps: observing the pointer reading of the spring support hanger as T2 and the inclination angle as a at point A; observing the pointer reading of the spring support hanger as T1 and the inclination angle as b at point B; the corrected pointer reading of the spring support hanger is T1-T2=tan(b-a) / tan(a-b); wherein, θ is the included angle between the line connecting point A and point B and the horizontal plane. Compared with the close observation by using a UAV or a camera telescopic rod, the correction method for visual error of spring support hanger scale indication can not only avoid the risk of accidental collision, but also has high inspection efficiency and simple operation, and can solve the indication error in visual inspection of the spring support hanger, correctly read the spring load, and guarantee the evaluation results of the pipe system load distribution and stress distribution.

Description

Technical Field

[0001] This invention specifically relates to a method for correcting visual errors in the scale indication of spring supports in the industrial field. Background Technology

[0002] Industrial pipelines are affected by their own weight, thermal expansion, and accidental loads during operation, requiring various types of supports and dampers to bear the loads and regulate displacement. To ensure the normal operation of the pipeline system, according to standards, the integrity and safety of pipeline supports and hangers need to be inspected regularly. Inspections are conducted visually, and for those with significant defects, further analysis, evaluation, or even design modifications are necessary. Visual inspection involves using tools such as cameras, flashlights, and binoculars to visually inspect and record the appearance integrity and structural functionality of the supports and hangers.

[0003] Spring supports, as a type of support, provide linearly varying support force to the piping system as the pipes shift. Spring supports are divided into brackets and hangers, both composed of connecting parts and functional components. The functional component refers to the spring and spring cylinder. The spring cylinder has a nameplate marking it, recording the manufacturer, model, design load, scale, and other information. Visually inspecting spring supports, besides checking for overall integrity, is crucial; the most important step is recording the scale readings on the spring, which directly correspond to the current load the spring provides to the piping system.

[0004] During the inspection, some of the hanging racks were positioned in locations unsuitable for close observation, so high-magnification cameras were needed for shooting and observation. However, due to the shooting angle, visual errors inevitably occurred, affecting the staff's analysis and judgment.

[0005] To address this type of problem, the following three approaches are currently being used: 1. Using drones to get close; 2. Using telescopic poles to get close and take photos; 3. Using load testing to directly measure the spring load.

[0006] However, using drones and telescopic poles for close-up filming can easily lead to accidental collisions. This is especially true in petrochemical, nuclear power, and thermal power plants, where the risk and impact of accidental collisions far outweigh the impact of spring load deviations. Furthermore, load testing techniques require pre-setting or disconnecting the suspension point to accurately measure the actual load, which is not only cumbersome and resource-intensive but also requires extensive on-site coordination (power supply, site, scaffolding, etc.). Summary of the Invention

[0007] In view of this, in order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a method for correcting visual errors in the scale indication of spring supports in nuclear power plants.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A method for correcting visual errors in the scale indication of a spring support hanger includes the following steps:

[0010] At point A, the pointer reading of the spring support is T2, and the tilt angle is a.

[0011] At point B, the pointer reading of the spring support hanger is T1, and the tilt angle is b.

[0012] The corrected pointer reading for the spring support is:

[0013]

[0014] In the formula, θ is the angular difference between point B and point A in the vertical direction.

[0015] According to some preferred embodiments of the present invention, θ is a positive number when the horizontal position of point B is higher than that of point A; θ is a negative number when the horizontal position of point B is lower than that of point A; and θ is 0 when points A and B are on the same horizontal plane.

[0016] According to some preferred embodiments of the present invention, when the angle between the line connecting points A and B and the horizontal plane is θ1, and the extension direction of the spring is at an angle θ2 with the vertical axis, then θ in the above equation is θ1 + θ2.

[0017] According to some preferred embodiments of the invention, the tilt angle is the angle formed between the line connecting the observation device and the pointer and the horizontal plane.

[0018] According to some preferred embodiments of the invention, the projections of points A, B, and the spring support on the horizontal plane are on the same straight line.

[0019] According to some preferred embodiments of the present invention, a slide rail is provided on the straight line formed by the projections of points A, B, and the spring support on the horizontal plane, and the observation device moves on the slide rail.

[0020] According to some preferred embodiments of the present invention, the observation device is provided with an inclinometer for obtaining the tilt angle when the observation device observes the pointer degree.

[0021] According to some preferred embodiments of the invention, the above steps are repeated, and the average of a plurality of corrected readings is taken as the final correction result.

[0022] Due to the adoption of the above technical solutions, the advantages of the present invention compared with the prior art are as follows: The method for correcting visual errors in the scale indication of the spring support of the present invention, compared with using drones or camera telescopic poles for close observation, not only avoids the risk of accidental contact, but also has high inspection efficiency, is simple and easy to operate, can solve the indication error when visually inspecting the spring support, correctly read the spring load, and ensure the evaluation results of the load distribution and stress distribution of the piping system. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figures 1 to 4 These are schematic diagrams illustrating the principle of the method for correcting visual errors in the scale indication of the spring support under different conditions in a preferred embodiment of the present invention. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0026] like Figure 1 As shown, the method for correcting visual errors in the scale indication of the spring support bracket in this embodiment includes the following steps:

[0027] Step 1: Obtain the pointer reading T2 and the tilt angle a of the spring support at point A.

[0028] When observing the pointer reading of the spring hanger at point A, due to the obstruction of the angle and the pointer, the pointer reading observed by the high-definition camera is T2. At this time, the angle between the angle and the horizontal is obtained by the inclinometer attached to the high-definition camera.

[0029] The tilt angle is the angle formed between the line connecting the observation device and the pointer and the horizontal plane. The observation device is equipped with an inclinometer to obtain the tilt angle when the observation device is observing the pointer's degree.

[0030] Step 2: Obtain the pointer reading T1 and the tilt angle b of the spring support at point B.

[0031] When the high-definition camera moves a certain distance to point B, the observed pointer reading is T1, and the angle between the high-definition camera's line of sight and the horizontal is b.

[0032] Step 3, 1) If points A and B are on the same horizontal plane, the distance between A and B is L1. The projections of points A, B, and the spring support on the horizontal plane are on the same straight line. In this embodiment, a slide rail is set on the straight line formed by the projections of points A, B, and the spring support on the horizontal plane, and the device is observed to move on the slide rail to ensure accuracy.

[0033] Based on trigonometric relationships, we obtain the following formula:

[0034]

[0035] The triangular relationship formed by the spring scale readings is as follows: Figure 1 As shown in the top left corner. Similarly, the following formula can be obtained:

[0036]

[0037] In the above formula, L2 is the distance between point B and the projection of the pointer on the horizontal plane; T3 is the distance between T2 and the pointer, which is the visual error.

[0038] The pointer reading of the spring support after visual error correction is T = T2 - T3, that is, the corrected reading is...

[0039]

[0040] 2) When the ground at point B in the second measurement has a counterclockwise tilt angle θ, according to Figure 2 The angular relationship shown indicates that the visual error is:

[0041]

[0042] Similarly, such as Figure 2 As shown in the upper left corner, if the spring has a counterclockwise tilt angle θ with the vertical axis, it can be converted into the angle θ between point B and point A. The visual error in this case is the same as in the previous formula. The corrected reading is then:

[0043]

[0044] Similarly, when the ground at point B in the second measurement has a counterclockwise tilt angle θ1 and the extension direction of the spring has a counterclockwise tilt angle θ2 with respect to the vertical axis, then θ in the above equation is θ1 + θ2, and the corrected reading is:

[0045]

[0046] 3) That is, when the ground at point B in the second measurement has a clockwise tilt angle θ, according to Figure 3 The angular relationship shown indicates that the visual error is:

[0047]

[0048] Similarly, such as Figure 3 As shown in the upper left corner, if the spring has a clockwise tilt angle θ with the vertical axis, it can be converted into the angle θ between point B and point A. The visual error in this case is the same as in the previous formula. The corrected reading is as follows:

[0049]

[0050] Similarly, when the ground at point B in the second measurement has a clockwise tilt angle θ1 and the spring has a clockwise tilt angle θ2 with respect to the vertical axis, then θ in the above equation is θ1 + θ2, and the corrected reading is:

[0051]

[0052] As can be seen, when points A and B are on the same horizontal plane, θ is 0, which is the simplest case. When points B and A are on different horizontal planes, or when the spring cylinder of the spring support is not vertically set, the angle can be converted into the angle difference between point B and point A in the vertical direction, that is, the angle θ between the line connecting points A and B and the horizontal plane, and then substituted into the formula for calculation.

[0053] On the other hand, when observation point A and observation point B, as well as the spring, are not aligned due to constraints, such as... Figure 4 As shown. From any observation point with the spring as the center, the observation angle at every point on the outer circle forming the cone is the same. Therefore, for any two observation points, A' and B' can be found, forming a circle with the object being measured as shown. Figure 1 The straight line shown illustrates that the above method can also be used to eliminate visual errors when observing readings at any two points.

[0054] Step 4: Repeat the above steps and take the average of multiple corrected readings as the final correction result to reduce errors and improve test accuracy.

[0055] The visual error correction method of this invention, based on two independent observations of the spring hanger pointer reading, derives and calculates the true spring hanger pointer reading through theoretical formulas. Compared to using drones or camera telescopic poles for close-range observation, this method not only avoids the risk of accidental contact but also offers high inspection efficiency and simple operation. It resolves indication errors during visual inspection of spring hangers, accurately reads spring loads, and ensures accurate assessment results of pipe system load and stress distribution. The corrected spring pointer reading obtained by this method is independent of the distance between the two observation points. As long as both observations are conducted at the same horizontal level, and the tilt angle and corresponding reading are measured, the corrected spring pointer reading can be obtained. In practical use, the camera can be fixed to an inclined plate with angle adjustment and locking, which is then fixed to a graduated slide rail. During use, a photograph is taken at a point on the slide rail, recording the slide rail graduation and the inclined plate angle at that moment. The inclined plate is then moved to another position, and another photograph is taken, recording the slide rail graduation and the inclined plate angle at that moment. Through these two photographs, the spring graduation position can be accurately calculated. The slide rail can be replaced by a slide rail robot or a walking robot.

[0056] The visual error correction method for spring support bracket scale indication of the present invention can be used for scale measurement in three-dimensional space by observing from different observation points; it can be used to measure the positional changes of constant force spring supports, variable force springs, damping spring supports, hydraulic dampers or other structures; it can be done through multiple measurements (more than two); it can be integrated into daily inspection instruments to facilitate equipment management by on-site inspection personnel; and it can be applied to the observation platform of intelligent inspection tools and inspection robots.

[0057] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for correcting visual errors in the scale indication of a spring support hanger, characterized in that, Includes the following steps: At point A, the pointer reading of the spring support is T2, and the tilt angle is a. At point B, the pointer reading of the spring support hanger is T1, and the tilt angle is b. The corrected pointer reading for the spring support is In the formula, θ is the angle between the line connecting points A and B and the horizontal plane; When the line connecting points A and B makes an angle θ1 with the horizontal plane, and the extension direction of the spring makes an angle θ2 with the vertical axis, then θ is θ1 + θ2. The tilt angle is the angle formed between the line connecting the observation device and the pointer and the horizontal plane; The projections of points A, B, and the spring support on the horizontal plane are on the same straight line; When point B is horizontally higher than point A, θ is a positive number; when point B is horizontally lower than point A, θ is a negative number. When points A and B are on the same horizontal plane, θ is 0; at this time, the corrected pointer reading of the spring support is...

2. The correction method according to claim 1, characterized in that, A slide rail is provided on the straight line formed by the projections of points A, B, and the spring support on the horizontal plane, and the observation device moves on the slide rail.

3. The correction method according to claim 1, characterized in that, The observation device is equipped with an inclinometer to obtain the tilt angle when the observation device is observing the pointer degree.

4. The correction method according to claim 1, characterized in that, This involves repeating the above steps and taking the average of multiple corrected readings as the final correction result.

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