Pipeline deformation measuring device

Abstract

The invention provides a pipeline deformation measuring device which is characterized in that two first guide rails are arranged on the top surface of the inner wall of a pipeline along the axial direction, a clamping groove is formed between the two first guide rails, and a second guide rail is arranged on the bottom surface of the inner wall of the pipeline along the axial direction; the measuring device comprises a shell, measuring arms are arranged on the four side faces of the shell, and displacement sensors are installed in the measuring arms and used for measuring the distance between the inner wall of the pipeline and the axis. The tail end of the measuring arm on the top face of the shell extends into the clamping groove to abut against the top face of the pipeline, the tail ends of the measuring arms on the left side face and the right side face of the shell abut against the left side face and the right side face of the pipeline respectively, and the tail end of the measuring arm on the bottom face of the shell abuts against the top face of the second guide rail. A distance measuring sensor is arranged at the front end of the shell and used for detecting the distance between the shell and a pipeline port. The measuring device is dragged to move in the axial direction of the pipeline, the four measuring arms are used for measuring radius data of the pipeline, meanwhile, the distance measuring sensor is matched, the radius change curve of the pipeline in the axial direction can be accurately determined, and the pipeline deformation measuring precision and measuring efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline measurement, and particularly to a pipeline deformation measurement device. Background Art

[0002] Special pipelines for deep - sea equipment assembly generally use steel pipelines with a length of 20 m and a diameter of 0.8 m. Along the axial direction, two guide rails are provided on the top surface of the inner wall of the pipeline, and a track groove is formed between the two guide rails to prevent the equipment from deflecting; a guide rail is provided on the bottom surface of the inner wall of the pipeline to support and fix the equipment.

[0003] The service environment of this kind of special pipeline is harsh, and it is often immersed in a high - salt and highly corrosive environment. After long - term use, it is prone to rust and deformation, resulting in changes in the straightness or aperture of the pipeline, affecting the loading and use of deep - sea equipment. Therefore, it is necessary to regularly measure the deformation of the pipeline to ensure the normal loading and use of deep - sea equipment.

[0004] Currently, generally, manual measurement methods or mechanical tooling dragging measurement methods are used to measure the deformation of the pipeline. The manual measurement method has low accuracy and low reliability, cannot determine the accurate position of the pipeline deformation, and cannot measure the bending deformation of the axis. The mechanical tooling dragging measurement method has a large workload, cannot complete the measurement at one time in the case of multi - point deformation, and cannot give accurate deformation amounts. Summary of the Invention

[0005] The present invention provides a pipeline deformation measurement device, which solves the problems of low accuracy and large workload existing in the existing solutions for measuring the deformation of special pipelines.

[0006] The technical solution of the present invention is realized as follows:

[0007] The present invention provides a pipeline deformation measurement device. Along the axial direction, two spaced - apart first guide rails are provided on the top surface of the inner wall of the pipeline, and a card slot is formed between the two first guide rails; along the axial direction, a second guide rail is provided on the bottom surface of the inner wall of the pipeline; the measurement device includes a housing. Measuring arms are provided on the top surface, bottom surface, left side surface and right side surface of the housing. A displacement sensor is installed inside the measuring arm for measuring the distance between the inner wall of the pipeline and the axis. The end of the measuring arm on the top surface of the housing extends into the card slot and abuts against the top surface of the inner wall of the pipeline. The ends of the measuring arms on the left side surface and right side surface of the housing respectively abut against the left side surface and right side surface of the inner wall of the pipeline. The end of the measuring arm on the bottom surface of the housing abuts against the top surface of the second guide rail; a distance measuring sensor is provided at the front end of the housing for detecting the distance between the housing and the pipeline port.

[0008] Specifically, the measuring arm includes a fixed arm and a telescopic arm. A sliding cavity is provided inside the fixed arm along the length direction. A first limiting ring and a second limiting ring are provided on the inner wall of the sliding cavity. A third limiting ring is provided outside the telescopic arm. The third limiting ring is located between the first limiting ring and the second limiting ring. A compression spring is sleeved outside the telescopic arm. Two ends of the compression spring are respectively abutted against the first limiting ring and the third limiting ring. The compression spring forces the telescopic arm to displace towards the outlet of the sliding cavity. The displacement sensor is installed at a position on the bottom surface of the sliding cavity facing the end surface of the telescopic arm for detecting the distance between the end surface of the telescopic arm and the bottom surface of the sliding cavity.

[0009] Further, a roller is installed at the end of the telescopic arm through a U-shaped frame. The roller is in rolling abutment with the inner wall of the pipeline.

[0010] Further, two measuring arms are provided on the top surface of the housing. The roller at the end of one measuring arm extends into the card slot and is in rolling abutment with the top surface of the inner wall of the pipeline. The two rollers at the end of the other measuring arm are respectively in rolling abutment with the bottom surfaces of the two first guide rails.

[0011] Specifically, guide assemblies are provided at both the front and rear ends of the top surface of the housing. The guide assembly includes a support rod. A guide block is provided at the top of the support rod. The outer diameter of the guide block matches the inner diameter of the card slot.

[0012] Specifically, two limiting rollers are installed on the measuring arm on the bottom surface of the housing through a bracket. The distance between the two limiting rollers matches the width of the second guide rail. The two limiting rollers are in rolling abutment with the outer wall of the second guide rail.

[0013] Preferably, the measuring device further includes an axis measuring assembly. The axis measuring assembly includes a laser emitter installed at the port of the pipeline and a laser receiving assembly installed on the housing. The laser receiving assembly includes a laser target surface, a camera located on the back of the laser target surface, and an image processing module. The laser emitter is installed at the axial center position of the port of the pipeline. The camera is used to capture an image of the light spot on the laser target surface. The image processing module is used to process the light spot image to obtain the coordinate information of the light spot.

[0014] Specifically, the laser emitter is installed at the port of the pipeline through an annular frame. The annular frame includes a clamping ring, an installation cylinder, and a plurality of connecting arms. The laser emitter is fixedly installed inside the installation cylinder. The clamping ring and the installation cylinder are connected through a plurality of connecting arms. The outer diameter of the clamping ring matches the inner diameter of the pipeline. The clamping ring and the pipeline are fixed by screws.

[0015] Further, a plurality of limiting blocks are provided on the outer wall of the clamping ring along the circumferential direction. The inner side surface of the limiting block abuts against the end surface of the pipeline.

[0016] Preferably, a temperature sensor is provided on the housing for detecting the temperature of the measuring device. The temperature sensor is connected to the main control chip for temperature compensation of the data detected by the displacement sensor.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] (1) By dragging the measuring device to move along the axial direction of the pipeline, the present invention uses four measuring arms, namely up, down, left and right, to measure the radius data of the pipeline. At the same time, with the cooperation of the ranging sensor, the radius change curve of the pipeline along the axial direction can be accurately determined, improving the measurement accuracy and efficiency of pipeline deformation measurement;

[0019] (2) By installing two measuring arms on the top surface of the housing, which are respectively used to measure the distance from the top surface of the inner wall of the pipeline to the axis and the distance from the bottom surface of the first guide rail to the axis, the deformation amount of the first guide rail can be calculated according to the distance difference, thereby improving the accuracy of pipeline deformation measurement;

[0020] (3) By providing a guiding component at the front and rear ends of the top surface of the housing, on the one hand, it is convenient to guide the rollers at the ends of the measuring arms on the top surface of the housing to be embedded in the card slots, improving the assembly efficiency of the measuring device; on the other hand, it can prevent the measuring device from swaying left and right when displacing along the axis in the pipeline, enhancing the stability of the measuring device, thereby further improving the accuracy of pipeline deformation measurement;

[0021] (4) By installing a laser emitter at the pipeline port and a laser receiving component on the housing, the position change of the pipeline axis can be accurately measured through the cooperation of the laser receiving component and the laser emitter, further improving the accuracy of pipeline deformation measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is a schematic assembly structure diagram of a pipeline deformation measuring device of the present invention in a pipeline;

[0024] Figure 2 It is a schematic internal structure diagram of the measuring arm in the embodiment of the present invention;

[0025] Figure 3 It is a schematic assembly structure diagram of the measuring device in a pipeline in another embodiment of the present invention;

[0026] Figure 4Schematic side view of the measuring device in the embodiment of the present invention;

[0027] Figure 5 Schematic installation structure of the axis measuring component at the pipe port in the embodiment of the present invention;

[0028] In the figure: 1, pipe; 2, first guide rail; 3, second guide rail; 4, housing; 5, displacement sensor; 6, distance measuring sensor; 7, fixed arm; 8, telescopic arm; 9, sliding cavity; 10, first limiting ring; 11, second limiting ring; 12, third limiting ring; 13, compression spring; 14, roller; 15, support rod; 16, guide block; 17, limiting roller; 18, laser emitter; 19, target surface; 20, snap ring; 21, mounting cylinder; 22, connecting arm; 23, screw; 24, limiting block. Detailed implementation manners

[0029] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Referring to Figures 1 to 5 , the present invention provides a pipeline deformation measuring device for measuring the deformation amount of a special pipeline 1 for assembling deep-sea equipment. Two spaced first guide rails 2 are provided along the axial direction on the inner wall top surface of the pipeline 1, and a card slot is formed between the two first guide rails 2. A second guide rail 3 is provided along the axial direction on the inner wall bottom surface of the pipeline 1; the measuring device includes a housing 4. Measuring arms are provided on the top surface, bottom surface, left side surface and right side surface of the housing 4. A displacement sensor 5 is installed inside the measuring arm for measuring the distance between the inner wall of the pipeline 1 and the axis. The end of the measuring arm on the top surface of the housing 4 extends into the card slot to abut against the inner wall top surface of the pipeline 1. The ends of the measuring arms on the left side surface and the right side surface of the housing 4 respectively abut against the left side surface and the right side surface of the inner wall of the pipeline 1. The end of the measuring arm on the bottom surface of the housing 4 abuts against the top surface of the second guide rail 3. A distance measuring sensor 6 is provided at the front end of the housing 4 for detecting the distance between the housing 4 and the port of the pipeline 1.

[0031] In this embodiment, a power module, a control main board, and a data acquisition module are further provided inside the housing 4. The data acquisition module is connected to each displacement sensor 5, and is used to synchronously collect the displacement data detected by each displacement sensor 5 and convert it into a digital signal for transmission to the control main board. The control main board is connected to the upper computer (industrial tablet computer) through an RS-422 communication interface. The upper computer is used to send control commands to the main control chip on the measuring device, receive the measurement data from the main control chip, analyze and process these data, finally obtain the deformation parameters of the pipeline 1, and display and store these data.

[0032] In this embodiment, the ranging sensor 6 adopts a laser rangefinder, with a measurement range of not less than 20 m, a measurement accuracy of not less than 1 mm, a measurement speed of up to 30 times / s, and has an external trigger function, and sends measurement data to the main control chip through an RS-232 interface.

[0033] Specifically, as Figure 2 shown, the measuring arm includes a fixed arm 7 and a telescopic arm 8. A sliding cavity 9 is provided inside the fixed arm 7 along the length direction. A first limiting ring 10 and a second limiting ring 11 are provided on the inner wall of the sliding cavity 9. A third limiting ring 12 is provided outside the telescopic arm 8. The third limiting ring 12 is located between the first limiting ring 10 and the second limiting ring 11. A compression spring 13 is sleeved outside the telescopic arm 8. Two ends of the compression spring 13 are respectively abutted against the first limiting ring 10 and the third limiting ring 12. The compression spring 13 forces the telescopic arm 8 to displace towards the outlet of the sliding cavity 9. The displacement sensor 5 (in this embodiment, the displacement sensor 5 adopts a photoelectric displacement sensor, model Keyence IL-100, with a resolution of 0.01 mm, a sampling frequency of 1 kHz, and the output signal is processed by a 16-bit high-precision A / D converter and then transmitted to the main control chip) is installed at a position on the bottom surface of the sliding cavity 9 facing the end surface of the telescopic arm 8, and is used to detect the distance between the end surface of the telescopic arm 8 and the bottom surface of the sliding cavity 9.

[0034] In this embodiment, the stiffness of the compression spring 13 is 5 N / mm, and the pre-pressure is 20 N, ensuring a stable contact force between the telescopic arm 8 and the inner wall of the pipeline.

[0035] In the present invention, by providing the first limiting ring 10 and the second limiting ring 11 on the inner wall of the sliding cavity 9, and providing the third limiting ring 12 outside the telescopic arm 8, through the cooperation of the third limiting ring 12 with the first limiting ring 10 and the second limiting ring 11, the upper and lower limit positions of the telescopic movement of the telescopic arm 8 can be restricted. At the same time, the limiting ring can also conduct guiding restriction on the telescopic direction of the telescopic arm 8, avoiding radial jitter during the telescopic process and improving the measurement accuracy.

[0036] Furthermore, as Figures 1 to 4As shown, a roller 14 is installed at the end of the telescopic arm 8 through a U-shaped frame. The roller 14 is in rolling contact with the inner wall of the pipe 1. By installing the roller 14 at the end of the telescopic arm 8, the friction between the end of the telescopic arm 8 and the inner wall of the pipe 1 can be reduced, making the movement of the measuring device in the pipe 1 smoother. At the same time, the damage to the inner wall of the pipe 1 can be reduced.

[0037] Optionally, the end of the telescopic arm 8 can be made of a measuring head made of a material with a smooth surface, a small friction coefficient, hardness and wear resistance, and the sliding is smooth.

[0038] Furthermore, as Figure 4 shown, in another embodiment, two measuring arms are provided on the top surface of the housing 4. The roller 14 at the end of one of the measuring arms (i.e., Figure 4 the left measuring arm in Figure 1 ) extends into the card slot and is in rolling contact with the top surface of the inner wall of the pipe 1 (reference can be made to Figure 4 ), which is used to measure the change in the distance (i.e., radius) between the top surface of the inner wall of the pipe 1 and the axis of the pipe 1. The two rollers 14 at the end of the other measuring arm (i.e., Figure 4 the right measuring arm in Figure 3 ) are respectively in rolling contact with the bottom surfaces of the two first guide rails 2 (reference can be made to Figure 3 ), which is used to measure the distance between the bottom surface of the first guide rail 2 and the axis of the pipe 1. The deformation amount of the first guide rail 2 can be calculated based on the difference between the two distances, thereby further improving the measurement accuracy of the deformation of the pipe 1.

[0039] Specifically, as Figure 4 shown, guide assemblies are provided at both the front and rear ends of the top surface of the housing 4. The guide assembly includes a support rod 15. A guide block 16 is provided at the top of the support rod 15. The outer diameter of the guide block 16 matches the inner diameter of the card slot. In this embodiment, the cross-section of the guide block 16 is oval, which facilitates the guide block 16 to enter the card slot. By providing two guide assemblies, on the one hand, it can guide the roller 14 at the end of the measuring arm on the top surface of the housing 4 to enter the card slot, and on the other hand, it can prevent the measuring device from swaying left and right when moving along the axis in the pipe 1, improving the stability of the measuring device, and thus further improving the measurement accuracy of the deformation of the pipe 1.

[0040] Specifically, as Figure 1 、 3 shown, two limiting rollers 17 are installed on the measuring arm on the bottom surface of the housing 4 through a bracket. The distance between the two limiting rollers 17 matches the width of the second guide rail 3. The two limiting rollers 17 are in rolling contact with the outer wall of the second guide rail 3. By installing two limiting rollers 17 on the measuring arm on the bottom surface of the housing 4 to cooperate with the side wall of the second guide rail 3, it can ensure that the roller 14 at the end of the measuring arm on the bottom surface of the housing 4 is always in rolling contact with the top surface of the second guide rail 3, preventing it from falling off the second track. The surface of the limiting roller 17 is coated with a titanium nitride coating, and the friction coefficient ≤ 0.1, and the rolling resistance is reduced by graphite grease.

[0041] Preferably, as Figure 1 , 3 As shown in 5, the measuring device further includes an axis measuring assembly. The axis measuring assembly includes a laser emitter 18 installed at the port of the pipeline 1 and a laser receiving assembly installed on the housing 4. The laser receiving assembly includes a laser target surface 19, a camera located on the back of the laser target surface 19, and an image processing module. The laser emitter 18 is installed at the axial center position of the port of the pipeline 1. The camera is used to capture the image of the light spot on the laser target surface 19, and the image processing module is used to process the light spot image to obtain the coordinate information of the light spot (the image processing module uses the OpenCV library to implement the extraction of the center coordinates of the light spot, and the positioning accuracy is improved to ±0.05 mm through the sub-pixel algorithm). Through the cooperation of the laser receiving assembly and the laser emitter 18, the position change of the axis of the pipeline 1 can be accurately measured, further improving the accuracy of the deformation measurement of the pipeline 1

[0042] In this embodiment, the camera adopts an industrial camera with a USB interface, the image resolution is not less than 2000×1500 pixels, and a high-speed image processing board is used to obtain the center coordinates of the light spot through an image processing algorithm, and the ranging frequency is not less than 20 times / s.

[0043] The axis measuring assembly adopts a scheme of using an industrial digital camera to image the target surface 19 in order to obtain a larger light spot tracking range. The target surface 19 adopts a semi-transparent white glass sheet with a diameter of not less than 50 mm.

[0044] In this embodiment, the displacement stroke of the telescopic arm 8 is not less than 6 mm, the linearity is not less than 0.1%, the displacement sensor 5 outputs a DC voltage division signal, which is converted into a digital signal through a high-precision A / D conversion circuit and transmitted to the main control chip; to ensure that the measuring device can synchronously obtain the displacement data of each measuring point during the dragging process, the multi-channel analog / digital conversion circuit board should have the ability of high-speed synchronous sampling.

[0045] Specifically, as Figure 5 As shown, the laser emitter 18 is installed at the port of the pipeline 1 through an annular frame. The annular frame includes a snap ring 20, an installation cylinder 21, and a plurality of connecting arms 22 (in this embodiment, the connecting arm 22 is a flat plate structure, which is used to connect the installation cylinder 21 and the annular frame on the one hand, and to reflect the laser emitted by the ranging sensor 6 on the other hand, facilitating the detection of the distance between the measuring device and the pipe orifice). The laser emitter 18 is fixedly installed in the installation cylinder 21. The snap ring 20 is connected to the installation cylinder 21 through a plurality of connecting arms 22. The outer diameter of the snap ring 20 matches the inner diameter of the pipeline 1, and the snap ring 20 is fixed to the pipeline 1 through screws 23.

[0046] Furthermore, as Figure 5As shown, a number of limiting blocks 24 are provided on the outer wall of the snap ring 20 in the circumferential direction. The inner side of the limiting block 24 abuts against the end face of the pipeline 1, facilitating the rapid assembly of the snap ring 20 and the port of the pipeline 1. When the limiting block 24 abuts against the end face of the pipeline 1, the through holes on the snap ring 20 can be aligned with the through holes on the side wall of the pipeline 1 by selecting the snap ring 20, facilitating fixation by the screw 23.

[0047] Preferably, a temperature sensor is provided on the housing 4 for detecting the temperature of the measuring device. The temperature sensor is connected to the main control chip for temperature compensation of the data detected by the displacement sensor 5.

[0048] If the size of the measuring device changes during the measurement process (such as thermal expansion, etc.), the change amount will be directly superimposed on the measurement result, thereby increasing the measurement error. The thermal expansion coefficient of ordinary metal materials is usually on the order of 10-5 / °C, that is to say, the thermal expansion caused by a 1°C temperature difference may affect the measurement result. Therefore, a temperature sensor needs to be installed to correct the measurement result according to the known thermal expansion coefficient.

[0049] This embodiment uses a high-precision CMOS digital temperature sensor chip. The temperature range it can measure is -55°C to +125°C, and within the range of 0°C to +70°C, the measurement accuracy is ±0.5°C. It can directly output a 14-bit digital temperature value to the main control chip through the I2C bus. The temperature sensor (model DS18B20) collects the temperature data of the housing 4 in real time, and the main control chip performs linear compensation on the displacement sensor data according to the formula ΔL = α·L0·ΔT (α is the material thermal expansion coefficient, L0 is the reference length), and the error of the compensated data ≤0.02mm / °C.

[0050] In this embodiment, the main control chip uses STM32F407, which has a built-in multi-channel synchronous sampling ADC module to realize the synchronous acquisition of data from multiple displacement sensors 5 (sampling rate 1kHz). The data is transmitted to the host computer through the RS-422 interface in Modbus protocol, and the transmission rate is 115200bps to ensure real-time performance.

[0051] The working process of the measuring device of the present invention is as follows:

[0052] Install the measuring device into the pipeline 1, ensure that the roller 14 at the end of the measuring arm on the top surface of the housing 4 is embedded in the card slot, and ensure that the center of the laser target surface 19 is located at the axis position of the pipeline 1; and fix the laser emitter 18 at the port position of the pipeline 1 through the annular frame, ensuring that the laser emitter 18 is located at the axis position;

[0053] Pull the measuring device to move axially in the pipeline 1 through the pull rope, measure the distance data from the pipe orifice through the laser rangefinder, and simultaneously synchronously measure the coordinate change of the axis light spot and the radius data in the up, down, left, and right directions;

[0054] Comprehensively analyze and process all measurement data (including compensating and correcting the measurement data using temperature data), and use the least squares method to fit the change curve of the axial coordinates - axial positions of the axis of Pipeline 1 and the deformation data at each position;

[0055] The measuring device is dragged at a uniform speed of 0.2 m / s. The ranging sensor 6 records the axial position in real time, and at the same time, the host computer synchronously displays the radius change curve and the axis offset; when it is detected that the local deformation exceeds the threshold (such as the radius deviation > 2 mm), the system automatically marks the abnormal position and triggers an alarm.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pipeline deformation measurement device, wherein two spaced first guide rails (2) are arranged axially along the top surface of the inner wall of the pipeline (1), a clamping groove is formed between the two first guide rails (2), and a second guide rail (3) is arranged axially along the bottom surface of the inner wall of the pipeline (1); characterized in that, The measuring device includes a housing (4). Measuring arms are provided on the top surface, bottom surface, left side surface and right side surface of the housing (4). A displacement sensor (5) is installed inside the measuring arm for measuring the distance between the inner wall of the pipe (1) and the axis. The end of the measuring arm on the top surface of the housing (4) extends into the card slot and abuts against the top surface of the inner wall of the pipe (1). The ends of the measuring arms on the left side surface and right side surface of the housing (4) respectively abut against the left side surface and right side surface of the inner wall of the pipe (1). The end of the measuring arm on the bottom surface of the housing (4) abuts against the top surface of the second guide rail (3). A distance measuring sensor (6) is provided at the front end of the housing (4) for detecting the distance between the housing (4) and the port of the pipe (1).

2. The pipeline deformation measuring device according to claim 1, wherein, The measuring arm includes a fixed arm (7) and a telescopic arm (8). A sliding cavity (9) is provided inside the fixed arm (7) along the length direction. A first limiting ring (10) and a second limiting ring (11) are provided on the inner wall of the sliding cavity (9). A third limiting ring (12) is provided outside the telescopic arm (8). The third limiting ring (12) is located between the first limiting ring (10) and the second limiting ring (11). A compression spring (13) is sleeved outside the telescopic arm (8). The two ends of the compression spring (13) respectively abut against the first limiting ring (10) and the third limiting ring (12). The compression spring (13) forces the telescopic arm (8) to displace towards the outlet of the sliding cavity (9). The displacement sensor (5) is installed at a position on the bottom surface of the sliding cavity (9) facing the end surface of the telescopic arm (8) for detecting the distance between the end surface of the telescopic arm (8) and the bottom surface of the sliding cavity (9).

3. The pipeline deformation measurement device according to claim 2, wherein A roller (14) is installed at the end of the telescopic arm (8) through a U-shaped frame. The roller (14) is in rolling abutment with the inner wall of the pipe (1).

4. The pipeline deformation measurement device according to claim 2, characterized in that, Two measuring arms are provided on the top surface of the housing (4). The roller (14) at the end of one measuring arm extends into the card slot and is in rolling abutment with the top surface of the inner wall of the pipe (1). The two rollers (14) at the end of the other measuring arm are respectively in rolling abutment with the bottom surfaces of the two first guide rails (2).

5. The pipeline deformation measuring device according to claim 1, wherein Guide assemblies are provided at both the front and rear ends of the top surface of the housing (4). The guide assembly includes a support rod (15). A guide block (16) is provided at the top of the support rod (15). The outer diameter of the guide block (16) matches the inner diameter of the card slot.

6. The pipeline deformation measurement device according to claim 1, characterized in that, Two limiting rollers (17) are installed on the measuring arm on the bottom surface of the housing (4) through a bracket. The distance between the two limiting rollers (17) matches the width of the second guide rail (3). The two limiting rollers (17) are in rolling abutment with the outer wall of the second guide rail (3).

7. The pipeline deformation measuring device according to claim 1, wherein, The measuring device further includes an axis measuring assembly. The axis measuring assembly includes a laser emitter (18) installed at the port of the pipe (1) and a laser receiving assembly installed on the housing (4). The laser receiving assembly includes a laser target surface (19), a camera located on the back of the laser target surface (19) and an image processing module. The laser emitter (18) is installed at the axis position of the port of the pipe (1). The camera is used to capture the image of the light spot on the laser target surface (19). The image processing module is used to process the light spot image to obtain the coordinate information of the light spot.

8. The pipeline deformation measurement device according to claim 7, wherein The laser emitter (18) is mounted at the port of the pipeline (1) through an annular frame. The annular frame includes a snap ring (20), a mounting cylinder (21) and a plurality of connecting arms (22). The laser emitter (18) is fixedly mounted in the mounting cylinder (21). The snap ring (20) and the mounting cylinder (21) are connected through a plurality of connecting arms (22). The outer diameter of the snap ring (20) matches the inner diameter of the pipeline (1). The snap ring (20) and the pipeline (1) are fixed by screws (23).

9. The pipeline deformation measuring device according to claim 8, wherein, A plurality of limiting blocks (24) are arranged on the outer wall of the snap ring (20) along the circumferential direction. The inner side surface of the limiting block (24) abuts against the end surface of the pipeline (1).

10. The pipeline deformation measurement device according to claim 1, wherein, A temperature sensor is arranged on the housing (4) for detecting the temperature of the measuring device. The temperature sensor is connected to the main control chip for performing temperature compensation on the data detected by the displacement sensor (5).

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