A pipe diameter measuring device

Abstract

The utility model relates to measuring technical field discloses a kind of pipeline pipe diameter measuring device, the device includes measurement unit, drive unit, control unit and processing unit, wherein, measurement unit includes laser range finder and moving mechanism, for continuous collection pipe end inner diameter and corresponding angle data, control unit and drive unit and processing unit carry out data interaction, control unit sends instruction to motor driver and laser driver in drive unit, motor driver and laser driver respectively drive moving mechanism and laser range finder in measurement unit to measure, and feedback measurement data to control unit, control unit again upload measurement data to processing unit, processing unit receives measurement data, determines pipe end long and short axis and perimeter etc. according to measurement data.The utility model discloses pipeline pipe diameter measuring device, easy operation, high measurement efficiency, measurement result is accurate, and wide application range.

Description

Technical Field

[0001] This utility model relates to the field of pipe end inner diameter measurement technology, and in particular to a pipe diameter measurement device applicable to large-diameter pipes. Background Technology

[0002] Domestic and international long-distance pipelines generally use large-diameter, high-strength pipeline steel, and pipeline welding commonly employs automated welding processes. This process has high requirements for pipe end diameter and out-of-roundness deviation, which are standard requirements for steel pipes in pipeline transportation systems. Before leaving the factory, the pipe end diameter and circumference are measured manually. Manual measurement has disadvantages such as large errors, poor data repeatability, and low measurement efficiency. Therefore, it is necessary to develop a new type of efficient measuring instrument with high measurement accuracy and precision, suitable for batch measurement and data processing. Summary of the Invention

[0003] The purpose of this invention is to provide at least one pipe diameter measuring device, which can improve the measurement efficiency and accuracy of the inner diameter of large-diameter pipes.

[0004] To solve the above-mentioned technical problems, at least one embodiment of the present invention provides a pipe diameter measuring device, wherein the device includes:

[0005] The measuring unit includes a moving mechanism and a laser rangefinder mounted on the moving mechanism, wherein the laser rangefinder is moved to the target position by the moving mechanism to perform a measurement task on the diameter of the pipe being measured;

[0006] The driving unit includes a laser driver and a motor driver, which are electrically connected to the laser rangefinder in the measurement unit and the motor of the moving mechanism, respectively, so as to drive the laser rangefinder to perform a measurement task and drive the moving mechanism to move.

[0007] The control unit is electrically connected to the laser driver and the motor driver in the drive unit, and is used to control the operation of the laser driver and the motor driver, thereby driving the laser rangefinder to perform measurement tasks and driving the moving mechanism to move;

[0008] The processing unit, electrically connected to the control unit, is used to receive relevant data uploaded by the control unit. The relevant data includes measurement data collected by the measurement unit and fed back by the drive unit, thereby determining the diameter of the pipe being measured based on the measurement data.

[0009] In some alternative embodiments, the moving mechanism includes a rotating component comprising a detachable and / or length-adjustable rotating arm, one end of which is mounted on the output shaft of a motor of the moving mechanism, and the other end of which is mounted on the laser rangefinder, such that the rotating arm rotates when the motor outputs power, thereby rotating the laser rangefinder to the target position.

[0010] In some alternative embodiments, the motor of the moving mechanism includes a motor rotary encoder for recording the target position reached by the rotation of the laser rangefinder.

[0011] In some alternative embodiments, the laser rangefinder includes a laser probe that measures the distance between itself and the inner wall of the pipe being measured by means of laser scanning.

[0012] In some alternative embodiments, the laser rangefinder is detachably mounted at the end of the rotating arm.

[0013] In some alternative embodiments, the rotating component further includes a detachable and / or height-adjustable support for supporting the rotating component inside the pipe being tested.

[0014] In some alternative embodiments, the control unit and the drive unit exchange data via an EtherCAT bus.

[0015] In some optional embodiments, the processing unit includes a serial port server and a mobile terminal, and the control unit interacts with the mobile terminal through the serial port server.

[0016] In some optional embodiments, the processing unit further includes a terminal display component for displaying relevant data in real time.

[0017] The pipe diameter measuring device provided in the embodiments of this utility model has the following beneficial technical effects:

[0018] This invention employs a novel, highly efficient laser rangefinder to measure the inner diameter and ellipticity of large-diameter pipe ends. It mainly comprises a measurement unit, a drive unit, a control unit, and a processing unit. The measurement unit includes a laser rangefinder and a moving mechanism for continuously acquiring pipe end inner diameter and corresponding angle data. The control unit interacts with the drive and processing units, issuing commands to the motor driver and laser driver in the drive unit. The motor driver and laser driver respectively drive the moving mechanism and the laser rangefinder mounted on the moving mechanism to perform measurements and feed back the measurement data to the control unit. The control unit then uploads the measurement data to the processing unit. The processing unit receives the measurement data and, based on the principle of trigonometric measurement, uses the least squares method to iteratively fit the standard ellipse equation, obtaining the fitted ellipse equation. By solving the ellipse equation, it obtains data such as the major and minor axes and circumference of the pipe end, ultimately achieving accurate measurement of the inner diameter and ellipticity of the pipe end. This invention discloses a pipe diameter measuring device that is simple to operate, highly efficient, accurate in measurement results, and widely applicable. Attached Figure Description

[0019] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, and these illustrative descriptions do not constitute a limitation on the embodiments.

[0020] Figure 1 This is a schematic diagram of the composition of the pipe diameter measuring device provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram illustrating the usage process of the pipe diameter measuring device provided in an embodiment of this utility model;

[0022] Figure 3 This is a flowchart illustrating the steps of the pipe diameter measurement method used in an embodiment of this utility model. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details are provided in the various embodiments of this utility model to facilitate a better understanding of the invention. However, the technical solutions claimed by this utility model can be implemented even without these technical details and various variations and modifications based on the following embodiments. The division of the various embodiments below is for ease of description and should not constitute any limitation on the specific implementation of this utility model. The various embodiments can be combined with and referenced by each other without contradiction.

[0024] To address the shortcomings of existing measurement technologies, this invention provides an instrument for measuring the diameter and circumference of pipe ends using laser ranging.

[0025] The technical problem to be solved by this utility model is achieved through the following technical solution, and the instrument mainly includes:

[0026] The measuring unit includes a moving mechanism and a laser rangefinder mounted on the moving mechanism, wherein the laser rangefinder is moved to the target position by the moving mechanism to perform a measurement task on the diameter of the pipe being measured.

[0027] The drive unit includes a laser driver and a motor driver, which are electrically connected to the laser rangefinder and the motor of the moving mechanism in the above-mentioned measurement unit, respectively, so as to drive the laser rangefinder to perform the measurement task and the moving mechanism to move.

[0028] The control unit is electrically connected to the laser driver and motor driver in the drive unit. On the one hand, it controls the operation of the laser driver and motor driver, thereby precisely controlling the laser rangefinder to perform measurement tasks and the rotation of the motor of the moving mechanism. On the other hand, it receives measurement data collected by the measurement unit via feedback from the laser driver and motor driver.

[0029] The processing unit, electrically connected to the control unit, is used to receive relevant data uploaded by the control unit. The relevant data includes measurement data collected by the measurement unit via feedback from the laser driver and the motor driver, thereby determining the diameter of the pipe being measured based on the measurement data.

[0030] The implementation details of the above method are described in detail below through examples. The following content is only for the convenience of understanding the implementation details and is not necessary for implementing this solution.

[0031] Example 1

[0032] like Figure 1 As shown in the figure, this embodiment provides a pipe diameter measuring device. The device mainly uses a new type of high-efficiency laser rangefinder to measure distance. Based on the measurement principle of triangulation, it realizes the measurement of the distance from the laser probe to the inner wall of the pipe being measured.

[0033] In this embodiment, the measuring unit includes a laser rangefinder and a rotating mechanism. The rotating mechanism consists of a motor 2, a bearing 3, a connecting shaft (also called an output shaft) 5, a rotating arm 7, a battery, and a bracket. The motor 2 is coaxially mounted with the connecting shaft 5, and the rotating arm 7 is mounted on the connecting shaft 5 via the bearing 3. The battery 11 supplies power to the motor 2, and the bracket 10 can be placed on the inner wall of the pipe being measured to support the rotating mechanism. Furthermore, to accommodate different pipe diameters, this embodiment employs interchangeable legs and rotating arms, or adjusts the height of the legs and the length of the rotating arm. The legs, rotating arm, and the entire rotating mechanism are designed to be detachable, enabling measurement of different pipe diameters. The design requires the entire rotating mechanism to be small, lightweight, and robust, easy to carry and disassemble, and free from jamming or vibration during rotation to ensure the accuracy of the laser rangefinder measurement. Battery capacity is also considered to meet the requirements for the number of measurements. The laser probe 8 of the laser rangefinder is mounted at the end of the rotating arm 7 and can rotate continuously around its axis. When the rotating arm 7 rotates 360 degrees around the connecting shaft 5 under the drive of the motor 2, the laser rangefinder at the end of the rotating arm 7 can measure the distance between the probe and the inner wall of the pipe being measured in real time. Simultaneously, the motor 2 is equipped with a rotary encoder (not shown in the figure) to record the rotational position (or rotation angle) of the laser rangefinder in real time. In this embodiment, by combining a single-point laser rangefinder with a rotary encoder, continuous data acquisition within a 360-degree range of the pipe opening can be achieved. Furthermore, to ensure the uniformity and smoothness of the rotational motion during measurement, a controller is used in conjunction with a servo motor to ensure an accurate correspondence between the acquired position data rθ and the angle data θ.

[0034] In this embodiment, the drive unit includes a laser driver 14 and a motor driver 15. The laser driver 14 and the motor driver 15 are electrically connected to the laser rangefinder and the motor of the rotating mechanism in the aforementioned measurement unit, respectively, to drive the laser rangefinder to perform measurement tasks and the motor of the rotating mechanism to rotate. Furthermore, the laser driver 14 and the motor driver 15 are also responsible for feeding back the measurement data (angle data) collected by the laser rangefinder and the measurement data (position data) collected by the rotary encoder of the rotating mechanism to the control unit, respectively.

[0035] In this embodiment, the control unit interacts with the laser driver 14 and the motor driver 15 via an EtherCAT bus (e.g., Figure 2As shown in the diagram, precise rotational motion control is achieved during the detection process. The control unit has built-in preset program code and can start operation in both manual and automatic measurement modes. In manual mode, the control unit is associated with the user's manual start "Start Measurement" button and responds to manual operation of the "Start Measurement" button. In automatic mode, when the user touches the "Start Measurement" button displayed on the handheld tablet, a measurement command is sent to the control unit via the serial port server 16 of the machine head, according to the Modbus TCP protocol. The control unit then sends a command to the motor driver, causing the rotating arm to rotate uniformly one revolution at a set linear speed. The rotary encoder and laser rangefinder record measurement data (position and angle) at equal intervals, and then feed this data back to the control unit via its own driver. This measurement data is stored in the control unit as text data.

[0036] In this embodiment, the processing unit includes a serial port server and a tablet computer (such as...). Figure 2 (As shown). The control unit has an RS485 communication interface, which transmits data to the host computer (handheld computer) via a serial server, enabling data exchange between the control unit and the host computer (handheld computer). In this embodiment, the control unit transmits the measurement data to the host computer (handheld computer) in CSV file format all at once. The host computer (handheld computer) has a built-in computer program that performs spatial coordinate transformation on the data (rθ, θ) collected and recorded by the laser rangefinder and motor encoder. It iteratively fits the standard ellipse equation using the least squares method to obtain the fitted ellipse equation. Then, by solving the ellipse equation, data such as the major and minor axes and the circumference are obtained. Finally, pipe diameter data is matched using a preset algorithm (pairing principle), and a measurement database is established. In addition, the host computer (handheld computer) has a screen to display the processing results. The handheld computer preferably uses a touch screen operation mode for user convenience.

[0037] like Figure 3 As shown, a pipe diameter measurement method is provided, which can be implemented based on the pipe diameter measurement device of Embodiment 1.

[0038] The main steps in pipe diameter measurement are as follows:

[0039] First, establish a polar coordinate system with the rotation center of the rotating arm of the rotating mechanism as the origin;

[0040] When a command to perform a measurement task is received, the control unit controls the laser driver and motor driver to start. The motor driver drives the moving mechanism to rotate the laser rangefinder at a set linear speed. Whenever the laser rangefinder rotates to the preset target position, the laser driver drives the laser rangefinder to measure the distance between the laser rangefinder and the inner wall of the pipe being measured, thereby obtaining multiple sets of polar coordinate measurement data (rθ, θ). Each set of measurement data includes the distance value rθ measured by the laser rangefinder and the angle value θ of the laser rangefinder's rotation.

[0041] The control unit uploads the measurement data (rθ, θ) fed back from the laser driver and motor driver to the processing unit. The processing unit performs a spatial coordinate transformation on the polar coordinate measurement data, converting it into Cartesian coordinate data. Based on the transformed data, it fits a standard ellipse equation and determines the pipe diameter by solving for the major and minor axes and the circumference of the ellipse equation. Finally, a measurement database for all measured pipes is established.

[0042] Furthermore, the above-mentioned fitting of an ellipse equation based on the transformed data, and determining the pipe diameter of the measured pipe by solving the major and minor axes and the circumference of the ellipse equation, may include the following steps:

[0043] Using the standard ellipse equation as the fitting target, the least squares method is used to iteratively approximate the target ellipse equation, and the coefficients of the ellipse equation are determined.

[0044] Determine the major and minor axes and the circumference of the ellipse.

[0045] Following the pairing principle of prioritizing those with similar perimeter values ​​and secondarily those with similar major and minor axes, the pipe openings are paired sequentially according to their grade classification to determine the pipe diameter.

[0046] It should be noted that the control unit and processing unit in the above-mentioned device each include at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the steps of the pipe diameter measurement method in the above embodiments.

[0047] The memory and processor are connected via a bus, which can include any number of interconnecting buses and bridges, connecting various circuits of one or more processors and memories. The bus can also connect various other circuits, such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and will not be described further herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be a single element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices over a transmission medium. Data processed by the processor is transmitted over the wireless medium via an antenna, which further receives data and transmits it to the processor.

[0048] The processor manages the bus and handles general processing, and also provides various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions. Memory, on the other hand, is used to store data used by the processor during operation.

[0049] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A pipe diameter measuring device, characterized by, include: The measuring unit includes a moving mechanism and a laser rangefinder mounted on the moving mechanism, wherein the laser rangefinder is moved to the target position by the moving mechanism to perform a measurement task on the diameter of the pipe being measured; The driving unit includes a laser driver and a motor driver, which are electrically connected to the laser rangefinder in the measurement unit and the motor of the moving mechanism, respectively, so as to drive the laser rangefinder to perform a measurement task and drive the moving mechanism to move. The control unit is electrically connected to the laser driver and the motor driver in the drive unit, and is used to control the operation of the laser driver and the motor driver, thereby driving the laser rangefinder to perform measurement tasks and driving the moving mechanism to move; The processing unit, electrically connected to the control unit, is used to receive relevant data uploaded by the control unit. The relevant data includes measurement data collected by the measurement unit and fed back by the drive unit, thereby determining the diameter of the pipe being measured based on the measurement data.

2. The pipe diameter measuring device of claim 1, wherein, The moving mechanism includes a rotating component, which includes a detachable and / or length-adjustable rotating arm. One end of the rotating arm is mounted on the output shaft of the motor of the moving mechanism, and the other end of the rotating arm is mounted on the laser rangefinder, so that the rotating arm rotates when the motor outputs power, thereby rotating the laser rangefinder to the target position.

3. The pipe diameter measuring device according to claim 2, characterized in that, The motor of the moving mechanism includes a motor rotary encoder for recording the target position reached by the rotation of the laser rangefinder.

4. The pipe diameter measuring device according to claim 2, characterized in that, The laser rangefinder includes a laser probe, which is used to measure the distance between itself and the inner wall of the pipe being measured by scanning.

5. The pipe diameter measuring device according to claim 4, characterized in that, The laser rangefinder is detachably mounted at the end of the rotating arm.

6. The pipe diameter measuring device according to claim 2, characterized in that, The rotating component also includes a detachable and / or height-adjustable support for supporting the rotating component inside the pipe being tested.

7. The pipe diameter measuring device according to claim 1, characterized in that, An EtherCAT bus is provided between the control unit and the drive unit for data exchange.

8. The pipe diameter measuring device according to claim 1, characterized in that, The processing unit includes a serial port server and a mobile terminal, and the control unit interacts with the mobile terminal through the serial port server.

9. The pipe diameter measuring device according to claim 8, characterized in that, The processing unit also includes a terminal display component for displaying relevant data in real time.

10. The pipe diameter measuring device according to claim 1, characterized in that, The motor is a servo motor.

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