A method for online measurement of the skew angle of a spring hanger rod.

Abstract

This invention discloses an online measurement method for the skew angle of a spring hanger rod, which falls under the category of pipeline support and hanger inspection and can be widely applied in the power and energy fields. The method includes the following steps: (1) A baffle is horizontally installed at the bottom of the steel beam, and a set of laser rangefinders are installed on both sides of the pipe clamp bolt. The first set of laser rangefinders can swing freely around the pipe clamp bolt and can always remain vertical under its own weight. The second set of laser rangefinders is fixedly installed on the pipe clamp bolt, with the installation direction parallel to the direction of the spring hanger rod; (2) The vertical distance from the pin shaft center to the bottom of the baffle and the lower edge of the spring hanger cover are measured respectively; (3) The measurement data of the two sets of laser rangefinders are read in real time and imported into the computer for processing. The skew angle of the spring hanger rod is calculated according to the skew angle calculation formula. The method is simple in principle and easy for technicians to master. After the measuring equipment is installed once, remote real-time monitoring can be realized, which greatly reduces the labor cost.

Description

Technical Field

[0001] This invention relates to an online measurement method for the skew angle of a spring hanger rod, which falls under the category of pipeline support and hanger inspection and testing, and can be widely applied in the power and energy fields. Background Technology

[0002] Spring hangers are load-bearing hangers that play a crucial role in reducing the thrust or torque borne by equipment. Due to the inherent properties of metallic materials, steam pipelines undergo thermal expansion when transporting media, resulting in a three-dimensional thermal displacement of the pipeline. This horizontal thermal displacement causes the hanger rod to deflect at a certain angle. The larger the deflection angle, the greater the additional reaction force exerted by the hanger rod on the pipeline, increasing the secondary stress level and hindering the safe and stable operation of the pipeline. The power industry standard "Maintenance and Adjustment Guidelines for Steam and Water Pipelines and Supports in Thermal Power Plants" (DL / T 616-2006) clearly stipulates that the deflection angle of the spring hanger rod shall not exceed 4°.

[0003] Currently, the skew angle of spring hanger rods is generally inspected visually. However, the inspection results are greatly affected by factors such as the inspector's position and experience, resulting in extremely low reliability of the data. Furthermore, since rod skew is a motion problem occurring in three-dimensional space, even using an inclinometer during on-site inspections makes it difficult to guarantee the accuracy of the measurement results. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings in the prior art and to propose a scientific, reasonable and easy-to-operate method for measuring the deflection angle of the spring hanger rod.

[0005] The technical solution adopted by this invention to solve the above problems is: an online measurement method for the deflection angle of a spring hanger rod, characterized by comprising the following steps:

[0006] Step 1: Install a baffle horizontally at the bottom of the steel beam. Measure the vertical distance from the pin shaft center to the bottom of the baffle and record it as a0. Measure the distance from the pin shaft center to the lower edge of the spring hanger cover and record it as b0.

[0007] Step 2: Install a set of laser rangefinders on each side of the pipe clamp bolt. The first set of laser rangefinders can swing freely around the pipe clamp bolt, and the second set of laser rangefinders is fixedly installed on the pipe clamp bolt.

[0008] Step 3: Use a data acquisition device to collect measurement data from two sets of laser rangefinders in real time and import it into a computer. Use auxiliary calculation software to process the collected data and calculate the boom tilt angle.

[0009] Furthermore, the tail counterweight of the first set of laser rangefinders is increased so that the first set of laser rangefinders can always remain vertical under its own weight, and the installation direction of the second set of laser rangefinders is parallel to the direction of the boom.

[0010] Furthermore, the area of ​​the baffle is larger than the area of ​​the plane formed by the horizontal thermal displacement of the spring hanger, and it can ensure that the light from the first set of laser rangefinders is always blocked during the operation of the spring hanger.

[0011] Furthermore, the reading 'a' of the first set of laser rangefinders represents the vertical distance from the pipe clamp bolt axis to the baffle, and the reading 'b' of the second set of laser rangefinders represents the distance from the pipe clamp bolt axis to the lower edge of the spring hanger cover; the formula for calculating the hanger rod deflection angle θ is:

[0012] Furthermore, when the suspended platform is installed on the embedded iron at the bottom of the building platform, the bottom plane of the building platform can be directly used as a baffle.

[0013] Furthermore, visualization software can be used to generate a curve from the measurement results of the hanger rod deflection angle, enabling remote real-time monitoring of the hanger rod deflection angle of the spring hanger.

[0014] Compared with the prior art, the present invention has the following advantages and effects: (1) The principle of the method is relatively simple and easy for technicians to master; (2) The laser rangefinder is used to collect data. Compared with other sensors, the technology is mature, the manufacturing cost is low, and the maintenance is convenient; (3) Once the measuring equipment is installed, remote real-time monitoring can be realized, which can greatly reduce the labor cost. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the arrangement structure for measuring the deflection angle of the spring hanger rod in this invention.

[0016] Figure 2 This is a schematic diagram illustrating the principle of measuring the deflection angle of the spring hanger rod in this invention.

[0017] In the diagram: 1. Steel beam; 2. Hanging plate; 3. Pin shaft; 4. Spring hanger; 5. Hanging rod; 6. Pipe clamp bolt; 7. First group of laser rangefinders; 8. Second group of laser rangefinders; 9. Pipe clamp. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0019] Example

[0020] See Figures 1 to 2In this embodiment, a method for online measurement of the skew angle of a spring hanger rod is provided. A baffle is horizontally set at the bottom of the steel beam 1, and a set of laser rangefinders is installed on each side of the pipe clamp bolt 6. The first set of laser rangefinders 7 can swing freely around the pipe clamp bolt 6, and the second set of laser rangefinders 8 is fixedly installed on the pipe clamp bolt 6. The tail counterweight of the first set of laser rangefinders 7 is increased so that the first set of laser rangefinders 7 can always remain vertical under its own weight. The installation direction of the second set of laser rangefinders 8 is parallel to the direction of the hanger rod 5.

[0021] In this embodiment, the area of ​​the baffle is larger than the area of ​​the plane formed by the horizontal thermal displacement of the spring hanger 4, and it can ensure that the light from the first set of laser rangefinders 7 is always blocked during the operation of the spring hanger 4. However, if the hanging plate 2 is installed on the embedded iron at the bottom of the building platform, the bottom plane of the building platform can be directly used as the baffle.

[0022] In this embodiment, the reading 'a' of the first set of laser rangefinders 7 represents the vertical distance from the axis of the pipe clamp bolt 6 to the baffle, and the reading 'b' of the second set of laser rangefinders 8 represents the distance from the axis of the pipe clamp bolt 6 to the lower edge of the spring hanger 4 cover; the vertical distance from the axis of the measuring pin 3 to the bottom of the baffle is recorded as 'a0', and the distance from the axis of the measuring pin 3 to the lower edge of the spring hanger 4 cover is recorded as 'b0'; the formula for calculating the deflection angle θ of the hanger 5 is: The data acquisition device reads the measurement data of the two laser rangefinders in real time and imports them into the computer. According to the deflection angle calculation formula, the collected data is processed by auxiliary calculation software to calculate the deflection angle of the boom.

[0023] Any content not described in detail in this specification is prior art known to those skilled in the art.

[0024] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the scope of protection of the present invention. Any modifications and refinements made by those skilled in the art without departing from the concept and scope of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A method for online measurement of the deflection angle of a spring hanger rod, characterized in that, Includes the following steps: Step 1: Set a baffle horizontally at the bottom of the steel beam (1), measure the vertical distance from the center of the pin (3) to the bottom of the baffle and record it as a0, measure the distance from the center of the pin (3) to the lower edge of the spring hanger (4) cover and record it as b0; Step 2: Install a set of laser rangefinders on each side of the pipe clamp bolt (6). The first set of laser rangefinders (7) can swing freely around the pipe clamp bolt (6), and the second set of laser rangefinders (8) is fixedly installed on the pipe clamp bolt (6). Step 3: Use a data acquisition device to collect the measurement data of the two sets of laser rangefinders in real time and import them into the computer. Use auxiliary calculation software to process the collected data and calculate the boom tilt angle. The addition of a tail counterweight to the first set of laser rangefinders (7) ensures that the first set of laser rangefinders (7) remains vertical under its own weight, and the installation direction of the second set of laser rangefinders (8) is parallel to the direction of the boom (5). The area of ​​the baffle is larger than the area of ​​the plane formed by the horizontal thermal displacement of the spring hanger (4), and it can ensure that the light of the first set of laser rangefinders (7) is always blocked during the operation of the spring hanger (4); The reading 'a' of the first set of laser rangefinders (7) represents the vertical distance from the axis of the pipe clamp bolt (6) to the baffle; the reading 'b' of the second set of laser rangefinders (8) represents the distance from the axis of the pipe clamp bolt (6) to the lower edge of the spring hanger (4) cover; the formula for calculating the deflection angle θ of the hanger rod (5) is: 。 2. The method for online measurement of the skew angle of the spring hanger rod according to claim 1, characterized in that, When the hanging plate (2) is installed on the embedded iron at the bottom of the building platform, the bottom plane of the building platform is directly used as the baffle.

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