Pipe orifice laser measuring device for large-diameter seawater conveying anti-corrosion steel pipe

Abstract

The invention discloses a laser measuring device for a pipe orifice of a large-caliber anti-corrosion steel pipe for seawater transportation, and relates to the technical field of metering equipment characterized by adopting an optical method, the laser measuring device comprises a movable base, the movable base is rotatably connected with a shell, and the shell is provided with a laser transmitter and a binocular camera which are used for measurement. A limiting mechanism for mounting a steel pipe is arranged in the shell, the limiting mechanism comprises a mounting hole formed in one end of the shell, a mounting groove is fixed in the mounting hole, and a plurality of abutting rollers are annularly distributed and rotationally connected in the mounting groove; large friction force is generated through the dead weight of the steel pipe and the rotating drum on the driving transmission shaft, the rotating drum rotates and drives the steel pipe to rotate through the friction force, rotating scanning measurement is achieved under transmission rotation of the other rotating drums, and in the process, the laser transmitter and the binocular camera do not move; the steel pipe is always in the initial axis, and the scanning measurement part is always in the initial coordinate, so that the measurement result is more accurate.

Description

Technical Field

[0001] This invention relates to the field of metrology equipment technology characterized by the use of optical methods, and more particularly to a laser measuring device for the pipe opening of a large-diameter anti-corrosion steel pipe used for seawater transportation. Background Technology

[0002] In fields such as marine engineering, coastal power plants, and seawater desalination, large-diameter seawater transmission pipelines are critical infrastructure, often employing corrosion-resistant steel pipes to withstand the highly corrosive environment of seawater. During installation, the precision of the pipe joint connection directly affects sealing performance and service life. Excessive ellipticity, end-face flatness deviations, or bevel dimension errors can easily lead to leaks and accelerated localized corrosion. Therefore, accurate measurement of the pipe joint geometric parameters is a core element in ensuring project quality. Among non-contact technologies for measuring the pipe joints of corrosion-resistant steel pipes used in large-diameter seawater transmission, optical measurement has become a current research hotspot due to its advantages of not requiring direct contact with the pipe joint and its theoretically high measurement efficiency. Its core principle is to utilize the propagation characteristics of light to convert the geometric shape of the pipe joint into quantifiable optical signals, which are then processed by algorithms to obtain specific parameters.

[0003] After the pipeline leaves the factory, it may deform during transportation and hoisting. It needs to be re-measured at the construction site by the sea. However, the steel pipes at the construction site are mostly placed horizontally. During the laser measurement process, the pipeline needs to be rotated. The operator usually holds the pipe and rotates it by hand to scan and measure. During the rotation of the pipeline, due to its own weight, the axis of the pipeline is prone to shift, which causes the coordinates of different scanning positions to shift, resulting in a large error in the measurement results.

[0004] To address the aforementioned technical deficiencies, a solution is proposed. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that when measuring pipelines at seaside construction sites, the pipelines tend to deviate from their own axis due to their own weight, causing changes in the initial scanning coordinates and resulting in errors in the measurement results.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a laser measuring device for the pipe opening of a large-diameter anti-corrosion steel pipe for seawater transportation, comprising a movable base, a housing rotatably connected to the movable base, and a laser emitter and a binocular camera for measurement on the housing;

[0007] The housing is equipped with a limiting mechanism for installing steel pipes. The limiting mechanism includes an installation hole at one end of the housing, an installation groove fixed in the installation hole, and several abutment rollers arranged in a ring and rotatably connected in the installation groove. The steel pipe passes through the several abutment rollers and contacts the abutment rollers. An outer installation ring and an outer guide ring are vertically fixed on the bottom wall of the housing. An inner installation ring and an inner guide ring are sequentially fixed along the axial direction of the steel pipe at the end of the housing away from the installation groove. The inner installation ring is located inside the outer installation ring, and the inner guide ring is located inside the outer guide ring. Several annularly distributed rotating cylinders are rotatably connected between the inner guide ring and the inner installation ring, and between the outer guide ring and the outer installation ring, through a rotating shaft. The rotating shaft and the rotating cylinders are fixedly connected. The rotating cylinders between the inner guide ring and the inner installation ring are in contact with the inner wall of the steel pipe, and the rotating cylinders between the outer guide ring and the outer installation ring are in contact with the outer wall of the steel pipe.

[0008] The shell, contact roller, outer mounting ring, outer guide ring, inner mounting ring, inner guide ring, and rotating drum are distributed along the axis of the steel pipe. The rotating drum is equipped with a drive transmission assembly for rotating the steel pipe without changing the axis.

[0009] Furthermore, the inner guide ring is fixedly connected to the inner mounting ring, and both the inner guide ring and the outer guide ring have chamfers on the opposite sides away from the outer mounting ring.

[0010] Furthermore, the rotating shaft includes a drive transmission shaft and a clamping shaft. The drive transmission shaft is located at a lower position between the outer guide ring and the outer mounting ring. The drive transmission assembly includes a first motor fixedly installed at the end of the housing away from the mounting groove. The output end of the first motor is fixedly connected to one of the several drive transmission shafts, and a first gear is keyed to the output end of the first motor. Second gears are keyed to the remaining several drive transmission shafts. The first gear and the second gear mesh. A groove is provided on the bottom wall of the housing below the first gear and the second gear. The contact roller and the surface of the rotating drum are both made of soft rubber.

[0011] Furthermore, a first electric actuator mounting end is fixedly installed on the top of the movable base below the mounting groove. The movable end of the first electric actuator is rotatably connected to a first push plate via a rotating joint. The top of the first push plate contacts the bottom of the housing. Gas springs are provided on both sides of the first electric actuator. One end of the gas spring is rotatably connected to the housing, and the other end of the gas spring is rotatably connected to the movable base. A second electric actuator is fixedly installed on the top of the movable base below several rotating cylinders. The top of the second electric actuator is rotatably connected to a second push plate via a rotating joint. The top of the second push plate contacts the housing. The straight line of the first electric actuator and the second electric actuator is parallel to the straight line of the steel pipe axis.

[0012] Furthermore, a slide rail is fixed at one end of the housing above the first motor, and a second motor is fixedly installed at the bottom of the slide rail. The output end of the second motor is fixedly connected to a lead screw via a coupling. A mounting angle plate is fixed to the nut on the outer surface of the lead screw via bolts. The lead screw is rotatably connected inside the slide rail. The laser emitter includes a controller and an emitter. The controller is fixedly installed on the top of the mounting angle plate. A circular hole is opened on the top of the mounting angle plate. The emitter is vertically inserted through and fixedly installed in the circular hole, and the emitter is perpendicular to the axis of the steel pipe. The binocular camera is fixedly installed on the inner wall of the housing near the outer mounting ring. The binocular camera is located on the axial direction of the steel pipe.

[0013] Furthermore, a transparent cover is fixedly installed on the side surface of the mounting corner plate. The transparent cover is made of acrylic and slides movably on the upper part of the outer wall of the housing. The inner wall of the transparent cover is fitted with the outer wall of the housing, and an isolation cavity is provided between the transparent cover and the housing. The side of the mounting corner plate near the slide rail is fitted with the outer surface of the slide rail, and the mounting corner plate is movably slidably connected to the surface of the slide rail.

[0014] Furthermore, a square hole is provided on the side surface of the housing, and a negative pressure fan is fixedly installed in the square hole. The input end of the negative pressure fan is connected to the isolation cavity.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0016] 1. This laser measuring device for the pipe opening of a large-diameter anti-corrosion steel pipe for seawater transportation meets the flexibility required for construction sites at seaside locations through a movable base and a rotatable housing. After hoisting, a section of the pipe is sequentially placed into the mounting groove, inner guide ring, and outer guide ring within the housing, thus fixing the pipe's axis. The scanning and measuring part, consisting of a binocular camera and a laser emitter directly or indirectly mounted on the housing, rotates with the housing, ensuring that the scanning and measuring part and the steel pipe remain relatively stationary. The significant friction generated by the steel pipe's own weight and the rotating drum on the drive shaft causes the drum to rotate, which in turn drives the steel pipe. This rotational scanning measurement is achieved through the rotation of the other rotating drums. During this process, the laser emitter and binocular camera remain stationary, ensuring that the steel pipe and the scanning and measuring part remain on their initial axes and coordinates, resulting in more accurate measurement results.

[0017] 2. This laser measurement device for the pipe opening of a large-diameter anti-corrosion steel pipe for seawater transportation utilizes an isolation cavity created between the shell that limits the steel pipe and the transparent cover. A negative pressure fan ventilates the isolation cavity, extracting the salt mist characteristic of the coastal environment. This reduces laser attenuation and blurring of the light spot caused by the salt mist during optical measurement, enhancing the laser measurement effect. The transparent cover allows for the application of outdoor light, and the rotatable shell and movable base, designed for labor-saving operation, avoid direct sunlight. Furthermore, a shielding cloth can be flexibly added to the transparent shell surface to adjust the lighting conditions according to the required laser scanning, improving the laser emission and scanning measurement effects. Attached Figure Description

[0018] Figure 1 A schematic diagram of the overall external structure of the present invention is shown;

[0019] Figure 2 This invention is shown as a schematic diagram of its overall external structure from another angle.

[0020] Figure 3 A schematic diagram of the limiting mechanism portion of the present invention is shown;

[0021] Figure 4 A schematic diagram shows a structure in which several annularly distributed abutment rollers are rotatably connected within a mounting groove;

[0022] Figure 5 A schematic diagram of the drive transmission assembly is shown.

[0023] Figure 6 A schematic diagram of the meshing structure of the first gear and the second gear is shown;

[0024] Figure 7 A schematic diagram of the structure of the first electric actuator and the second electric actuator is shown;

[0025] Figure 8 A schematic diagram of the structure in which the transparent cover is fixedly installed on the side surface of the mounting corner plate is shown;

[0026] Figure 9 A schematic diagram of the structure is shown, showing the transparent cover sliding and fitting into the upper part of the outer surface of the shell.

[0027] Legend: 1. Movable base; 2. Gas spring; 3. First electric actuator; 4. First push plate; 5. Second electric actuator; 6. Second push plate; 7. Housing; 8. First motor; 9. First gear; 10. Second gear; 11. Rotating shaft; 12. Rotating cylinder; 13. Outer mounting ring; 14. Outer guide ring; 15. Inner mounting ring; 16. Inner guide ring; 17. Mounting groove; 18. Abutment roller; 19. Negative pressure fan; 20. Slide rail; 21. Second motor; 22. Lead screw; 23. Mounting angle plate; 24. Transparent cover; 25. Laser emitter; 26. Binocular camera. Detailed Implementation

[0028] 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 are within the scope of protection of the present invention.

[0029] like Figure 1 , Figure 2 As shown, the laser measuring device for the pipe opening of the large-diameter anti-corrosion steel pipe for seawater transportation in this embodiment includes a movable base 1, a housing 7 rotatably connected to the movable base 1, and a laser emitter 25 and a binocular camera 26 for measurement on the housing 7.

[0030] The mobile base 1 is a high-load-bearing frame with universal wheels and brake universal wheels fixedly connected to the bottom. The high-load-bearing frame has adjustable support feet on the side. The laser emitter 25 is a line laser emitter that emits a fan-shaped laser beam to form a continuous laser line on the surface of the steel pipe opening, covering half of the pipe opening. The binocular camera 26 is connected to a controller. The controller transmits the laser line image captured by the binocular camera 26 to the CPU embedded in the controller. The three-dimensional coordinates of the object under test are calculated through algorithms such as laser line extraction, stereo matching, and three-dimensional reconstruction to achieve measurement. The above structure and principle are all existing technologies and will not be described in detail below.

[0031] After hoisting one end of the steel pipe to be measured, align it with the mounting groove 17 at one end of the housing 7 and place it in the groove. The steel pipe contacts the contact roller 18, and the moving base 1 is pushed. The housing 7 rotates to adapt to the tilt angle of the steel pipe. After the steel pipe is installed, adjust the support feet on the moving base 1 downward to fix the moving base 1 stably on the ground. Adjust the position of the mounting angle plate 23. After the adjustment is completed, run the laser emitter 25 and the binocular camera 26 to measure the opening of the steel pipe.

[0032] like Figures 3-5As shown, the housing 7 is equipped with a limiting mechanism for installing a steel pipe. The limiting mechanism includes a mounting hole at one end of the housing 7, a mounting groove 17 fixed in the mounting hole, and several abutment rollers 18 arranged in a ring and rotatably connected in the mounting groove 17. The steel pipe passes through the abutment rollers 18 and contacts the abutment rollers 18. An outer mounting ring 13 and an outer guide ring 14 are vertically fixed to the bottom wall of the housing 7. An inner mounting ring 15 and an inner guide ring 16 are sequentially fixed along the axial direction of the steel pipe at the end of the housing 7 away from the mounting groove 17. The inner mounting ring 15 is located inside the outer mounting ring 13, and the inner guide ring 16 is located inside the outer guide ring 14. The inner guide ring 16 and the inner mounting ring 15, and the outer guide ring 14 and the outer mounting ring 13 are connected. Several annularly distributed rotating cylinders 12 are rotatably connected to each other via rotating shaft 11. The rotating shaft 11 is fixedly connected to the rotating cylinders 12. The rotating cylinders 12 between the inner guide ring 16 and the inner mounting ring 15 are in contact with the inner wall of the steel pipe, and the rotating cylinders 12 between the outer guide ring 14 and the outer mounting ring 13 are in contact with the outer wall of the steel pipe. The housing 7, the contact roller 18, the outer mounting ring 13, the outer guide ring 14, the inner mounting ring 15, the inner guide ring 16, and the rotating cylinders 12 are distributed along the axis of the steel pipe. The rotating cylinders 12 are provided with a drive transmission assembly for driving the steel pipe to rotate without changing the axis. The inner guide ring 16 is fixedly connected to the inner mounting ring 15. The inner guide ring 16 and the outer guide ring 14 are both provided with chamfers on the opposite sides away from the outer mounting ring 13.

[0033] The contact roller 18 is rotatably connected to the mounting groove 17 via a bearing. The bearing is installed between the contact roller 18 and the mounting groove 17 via a bearing housing. The rotating shaft 11 is rotatably connected to the outer guide ring 14, the outer mounting ring 13, the inner mounting ring 15, and the inner guide ring 16 via bearings, and is installed via a bearing housing. The bearings are ejector bearings, which include an inner ring, an outer ring, rolling elements, and a cage.

[0034] After the steel pipe enters the housing 7 through the mounting groove 17, it continues to slide in for installation. It is guided by the chamfer of the inner guide ring 16 and the outer guide ring 14. The steel pipe then passes between the outer mounting ring 13 and the inner mounting ring 15 and continues until it reaches the binocular camera 26 at a suitable shooting distance according to the pipe diameter, camera parameters, and line laser position. At this point, the rotating cylinder 12 between the inner mounting ring 15 and the inner guide ring 16 contacts the inner wall of the steel pipe, and the rotating cylinder 12 between the outer mounting ring 13 and the outer guide ring 14 contacts the outer wall of the steel pipe. After the steel pipe stops moving, the crane lowers the steel pipe and uses an external object to hold the end of the steel pipe away from the housing 7 to fix the steel pipe. Then, the laser emitter 25 and the binocular camera 26 are used for measurement.

[0035] like Figure 5 , Figure 6As shown, the rotating shaft 11 includes a drive transmission shaft and a clamping shaft. The drive transmission shaft is located at a lower position between the outer guide ring 14 and the outer mounting ring 13. The drive transmission assembly includes a first motor 8 fixedly installed at one end of the housing 7 away from the mounting groove 17. The output end of the first motor 8 is fixedly connected to one of the several drive transmission shafts, and the output end of the first motor 8 is keyed to a first gear 9. The remaining several drive transmission shafts are keyed to a second gear 10. The first gear 9 and the second gear 10 mesh. The bottom wall of the housing 7 is provided with a groove below the first gear 9 and the second gear 10. The surfaces of the contact roller 18 and the rotating drum 12 are made of soft rubber.

[0036] The first motor 8 is electrically connected to an external power supply. Its structure and principle are existing technologies. The clamping shaft consists of several rotating shafts 11, excluding the drive transmission shaft. The groove is provided to provide space for the rotation of the first gear 9 and the second gear 10. The first motor 8 is fixedly connected to its fixed drive transmission shaft through a coupling. The outer surface edge of the coupling is located between the outer mounting ring 13 and the first gear 9 to achieve no spatial motion interference.

[0037] When the steel pipe needs to be rotated, the first motor 8 is activated. The first motor 8 drives the first gear 9, which is fixedly connected to it, and the drive transmission shaft connected to the output end of the first motor 8 to rotate. The second gear 10 rotates with the first gear 9, and the remaining drive transmission shafts rotate with the second gear 10. The rotating drum 12, which is fixed to the drive transmission shaft, rotates with the drive transmission shaft. The steel pipe rotates on several rotating drums 12 around its axis through friction. The remaining rotating drums 12 and the contact rollers 18 also rotate with the steel pipe through friction, reducing the relative force generated by the steel pipe's own weight during rotation and improving stability.

[0038] like Figure 7 As shown, the first electric actuator 3 is fixedly installed at the top of the movable base 1 below the mounting groove 17. The movable end of the first electric actuator 3 is rotatably connected to the first push plate 4 through a rotating joint. The top of the first push plate 4 contacts the bottom of the housing 7. Gas springs 2 are provided on both sides of the first electric actuator 3. One end of the gas spring 2 is rotatably connected to the housing 7, and the other end of the gas spring 2 is rotatably connected to the movable base 1. The second electric actuator 5 is fixedly installed at the top of the movable base 1 below several rotating cylinders 12. The top of the second electric actuator 5 is rotatably connected to the second push plate 6 through a rotating joint. The top of the second push plate 6 contacts the housing 7. The straight line of the first electric actuator 3 and the second electric actuator 5 is parallel to the straight line of the steel pipe axis.

[0039] The structure and working principle of the first electric actuator 3, the second electric actuator 5, and the gas spring 2 are all existing technologies. The first electric actuator 3 and the second electric actuator 5 are electrically connected to an external power source. The first electric actuator 3 and the second electric actuator 5 are located below the two locations with the greatest force inside the housing 7, which improves the overall support force of the device.

[0040] During the steel pipe installation process, the housing 7 rotates with the steel pipe, and the gas spring 2 rotates and extends with the housing 7, maintaining the connection between the housing 7 and the movable base 1. At this time, the nuts on the rotating shafts of the first electric push rod 3 and the second electric push rod 5 are loosened, and the first push plate 4 and the second push plate 6 can rotate flexibly. The first electric push rod 3 and the second electric push rod 5 are fully retracted until the steel pipe installation is completed. Then, the first electric push rod 3 and the second electric push rod 5 are operated. The first push plate 4 extends with the first electric push rod 3 and contacts the bottom of the housing 7. The second push plate 6 extends with the second electric push rod 5 and contacts the bottom of the housing 7. The first push plate 4 and the second push plate 6 rotate by the force of contacting the bottom of the housing 7 until the first push plate 4 and the second push plate 6 are tightly attached to the bottom of the housing 7. At this time, the first electric push rod 3 and the second electric push rod 5 are stopped, and the first electric push rod 3 and the second electric push rod 5 support the housing 7.

[0041] like Figure 8 , Figure 9 As shown, a slide rail 20 is fixed at one end of the housing 7 above the first motor 8. A second motor 21 is fixedly installed at the bottom of the slide rail 20. The output end of the second motor 21 is fixedly connected to a lead screw 22 via a coupling. A mounting angle plate 23 is fixed to the nut on the outer surface of the lead screw 22 by bolts. The lead screw 22 is rotatably connected inside the slide rail 20. The laser emitter 25 includes a controller and an emitter. The controller is fixedly installed on the top of the mounting angle plate 23. A round hole is opened on the top of the mounting angle plate 23. The emitter is vertically inserted through and fixedly installed in the round hole, and the emitter is perpendicular to the axis of the steel pipe. A binocular camera 26 is fixedly installed on the housing 7. The binocular camera 26 is located on the axial direction of the steel pipe on the inner wall near the outer mounting ring 13. A transparent cover 24 is fixedly installed on the side surface of the mounting angle plate 23. The transparent cover 24 is made of acrylic and slides movably on the upper part of the outer wall of the housing 7. The inner wall of the transparent cover 24 fits into the outer wall of the housing 7. An isolation cavity is provided between the transparent cover 24 and the housing 7. The side of the mounting angle plate 23 near the slide rail 20 fits into the outer surface of the slide rail 20 and slides movably on the surface of the slide rail 20. A square hole is opened on the side surface of the housing 7. A negative pressure fan 19 is fixedly installed in the square hole. The input end of the negative pressure fan 19 is connected to the isolation cavity.

[0042] The second motor 21 and the negative pressure fan 19 are both electrically connected to an external power source. The specific structure and working principle of the second motor 21 and the negative pressure fan 19 are existing technologies. The bottom of the laser emitter 25 is the laser output port.

[0043] After the steel pipe is installed, the second motor 21 is activated. The output of the second motor 21 drives the lead screw 22 to rotate. The nut on the lead screw 22 generates a threaded transmission with the lead screw 22, enabling the nut on the lead screw 22 to move vertically within the range of the slide rail 20. The mounting angle plate 23 moves vertically with the nut on the lead screw 22. The laser emitter 25 moves along a straight line perpendicular to the axis of the steel pipe with the mounting angle plate 23. During the movement, the linear distance between the laser emitter 25 and the opening of the steel pipe changes until it moves to the required distance. After shutting down the second motor 21, the laser emitter 25 and binocular camera 26 are then used to measure the pipe opening. During the measurement process, the negative pressure fan 19 is run to extract the salt mist from the isolation chamber, keeping the air inside the isolation box clean. As the mounting plate 23 moves, the transparent cover 24 moves with it. The transparent cover 24 is always facing the laser output port of the laser emitter 25, and it is always kept closed with the housing 7. If the light needs to be blocked, the external light-blocking cloth can be placed on the transparent cover 24 as needed.

[0044] Working principle: After hoisting one end of the steel pipe to be measured, align it with the mounting groove 17 at one end of the housing 7 and place it in. The steel pipe contacts the contact roller 18, pushing the moving base 1. The housing 7 rotates to adapt to the tilt angle of the steel pipe. After the steel pipe is installed, adjust the support feet on the moving base 1 downward to fix the moving base 1 stably on the ground.

[0045] The installation process of the steel pipe is as follows: after the steel pipe enters the housing 7 through the installation groove 17, it continues to slide in for installation. It is guided by the chamfer of the inner guide ring 16 and the outer guide ring 14 through the inner guide ring 16 and the outer guide ring 14. Then the steel pipe passes through the outer installation ring 13 and the inner installation ring 15 and continues until it reaches the binocular camera 26 at a suitable shooting distance according to the pipe diameter, camera parameters, line laser position and other requirements. At this time, the rotating cylinder 12 between the inner installation ring 15 and the inner guide ring 16 contacts the inner wall of the steel pipe, and the rotating cylinder 12 between the outer installation ring 13 and the outer guide ring 14 contacts the outer wall of the steel pipe. After the steel pipe stops moving, the crane lowers the steel pipe and uses an external object to hold the end of the steel pipe away from the housing 7.

[0046] During the steel pipe installation process, the housing 7 rotates with the steel pipe, and the gas spring 2 rotates and extends with the housing 7 to maintain the connection between the housing 7 and the movable base 1. At this time, the nuts on the rotating shafts of the first electric push rod 3 and the second electric push rod 5 are loosened, the first push plate 4 and the second push plate 6 can rotate flexibly, and the first electric push rod 3 and the second electric push rod 5 are fully retracted. After the steel pipe installation is completed, the first electric push rod 3 and the second electric push rod 5 are operated. The first push plate 4 extends with the first electric push rod 3 and contacts the bottom of the housing 7. The second push plate 6 extends with the second electric push rod 5 and contacts the bottom of the housing 7. The first push plate 4 and the second push plate 6 rotate by the force of contacting the bottom of the housing 7 until the first push plate 4 and the second push plate 6 are tightly attached to the bottom of the housing 7. At this time, the first electric push rod 3 and the second electric push rod 5 are stopped. The first electric push rod 3 and the second electric push rod 5 support the housing 7.

[0047] When the steel pipe needs to be rotated, the first motor 8 is operated. The first motor 8 drives the first gear 9, which is fixedly connected to it, and the drive transmission shaft connected to the output end of the first motor 8 to rotate. The second gear 10 rotates with the first gear 9, and the remaining drive transmission shafts rotate with the second gear 10. The rotating drum 12, which is fixed to the drive transmission shaft, rotates with the drive transmission shaft. The steel pipe rotates on several rotating drums 12 around its axis through friction. The remaining rotating drums 12 and the contact roller 18 also rotate with the steel pipe through friction between them.

[0048] After the steel pipe is installed, the second motor 21 is activated. The output of the second motor 21 drives the lead screw 22 to rotate. The nut on the lead screw 22 generates a threaded transmission with the lead screw 22, enabling the nut on the lead screw 22 to move vertically within the range of the slide rail 20. The mounting angle plate 23 moves vertically with the nut on the lead screw 22. The laser emitter 25 moves along a straight line perpendicular to the axis of the steel pipe with the mounting angle plate 23. During the movement, the linear distance between the laser emitter 25 and the opening of the steel pipe changes until it moves to the required distance. After shutting down the second motor 21, the laser emitter 25 and binocular camera 26 are then used to measure the pipe opening. During the measurement process, the negative pressure fan 19 is run to extract the salt mist from the isolation chamber, keeping the air inside the isolation box clean. As the mounting plate 23 moves, the transparent cover 24 moves with it. The transparent cover 24 is always facing the laser output port of the laser emitter 25, and it is always kept closed with the housing 7. If the light needs to be blocked, the external light-blocking cloth can be placed on the transparent cover 24 as needed.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A laser measuring device for the pipe opening of a large-diameter anti-corrosion steel pipe used for seawater transportation, characterized in that, It includes a movable base (1), on which a housing (7) is rotatably connected, and on which a laser emitter (25) and a binocular camera (26) for measurement are provided; The housing (7) is provided with a limiting mechanism for installing a steel pipe. The limiting mechanism includes an installation hole at one end of the housing (7), an installation groove (17) fixed in the installation hole, and several abutment rollers (18) arranged in a ring and rotatably connected in the installation groove (17). The steel pipe passes through the several abutment rollers (18) and contacts the abutment rollers (18). An outer mounting ring (13) and an outer guide ring (14) are vertically fixed on the bottom wall of the housing (7). An inner mounting ring (15) and an inner guide ring (16) are sequentially fixed along the axial direction of the steel pipe at the end of the housing (7) away from the installation groove (17). The mounting ring (15) is located inside the outer mounting ring (13), and the inner guide ring (16) is located inside the outer guide ring (14). Several annularly distributed rotating cylinders (12) are rotatably connected between the inner guide ring (16) and the inner mounting ring (15) and between the outer guide ring (14) and the outer mounting ring (13) via a rotating shaft (11). The rotating shaft (11) and the rotating cylinders (12) are fixedly connected. The rotating cylinders (12) between the inner guide ring (16) and the inner mounting ring (15) are in contact with the inner wall of the steel pipe, and the rotating cylinders (12) between the outer guide ring (14) and the outer mounting ring (13) are in contact with the outer wall of the steel pipe. The housing (7), the contact roller (18), the outer mounting ring (13), the outer guide ring (14), the inner mounting ring (15), the inner guide ring (16), and the rotating drum (12) are distributed along the axis of the steel pipe. The rotating drum (12) is provided with a drive transmission assembly for driving the steel pipe to rotate without changing the axis.

2. The laser measuring device for the pipe opening of a large-diameter anti-corrosion steel pipe for seawater transportation according to claim 1, characterized in that, The inner guide ring (16) is fixedly connected to the inner mounting ring (15), and both the inner guide ring (16) and the outer guide ring (14) have chamfers on the opposite sides away from the outer mounting ring (13).

3. The laser measuring device for the pipe opening of a large-diameter anti-corrosion steel pipe for seawater transportation according to claim 1, characterized in that, The rotating shaft (11) includes a drive transmission shaft and a clamping shaft. The drive transmission shaft is located at a lower position between the outer guide ring (14) and the outer mounting ring (13). The drive transmission assembly includes a first motor (8) fixedly installed at one end of the housing (7) away from the mounting groove (17). The output end of the first motor (8) is fixedly connected to one of the several drive transmission shafts, and the output end of the first motor (8) is keyed to a first gear (9). The remaining several drive transmission shafts are keyed to a second gear (10). The first gear (9) meshes with the second gear (10). The bottom wall of the housing (7) is provided with a groove located below the first gear (9) and the second gear (10). The surface material of the contact roller (18) and the rotating drum (12) is soft rubber.

4. The laser measuring device for the pipe opening of a large-diameter anti-corrosion steel pipe for seawater transportation according to claim 1, characterized in that, The first electric push rod (3) is fixedly installed at the top of the movable base (1) below the mounting groove (17). The movable end of the first electric push rod (3) is rotatably connected to the first push plate (4) through a rotating joint. The top of the first push plate (4) contacts the bottom of the housing (7). Gas springs (2) are provided on both sides of the first electric push rod (3). One end of the gas spring (2) is rotatably connected to the housing (7), and the other end of the gas spring (2) is rotatably connected to the movable base (1). The second electric push rod (5) is fixedly installed at the top of the movable base (1) below several rotating cylinders (12). The top of the second electric push rod (5) is rotatably connected to the second push plate (6) through a rotating joint. The top of the second push plate (6) contacts the housing (7). The straight line of the first electric push rod (3) and the second electric push rod (5) is parallel to the straight line of the steel pipe axis.

5. The laser measuring device for the pipe opening of a large-diameter anti-corrosion steel pipe for seawater transportation according to claim 1, characterized in that, One end of the housing (7) is fixed with a slide rail (20) above the first motor (8). A second motor (21) is fixedly installed at the bottom of the slide rail (20). The output end of the second motor (21) is fixedly connected to a lead screw (22) through a coupling. A mounting plate (23) is fixed to the nut on the outer surface of the lead screw (22) by bolts. The lead screw (22) is rotatably connected in the slide rail (20). The laser emitter (25) includes a controller and an emitter. The controller is fixedly installed on the top of the mounting plate (23). A round hole is opened on the top of the mounting plate (23). The emitter is vertically inserted and fixedly installed in the round hole. The emitter is perpendicular to the axis of the steel pipe. The binocular camera (26) is fixedly installed on the inner wall of the housing (7) near the outer mounting ring (13). The binocular camera (26) is located on the axis of the steel pipe.

6. The laser measuring device for the pipe opening of a large-diameter anti-corrosion steel pipe for seawater transportation according to claim 5, characterized in that, A transparent cover (24) is fixedly installed on the side surface of the mounting angle plate (23). The transparent cover (24) is made of acrylic and slides on the upper part of the outer wall of the housing (7). The inner wall of the transparent cover (24) is fitted with the outer wall of the housing (7). An isolation cavity is provided between the transparent cover (24) and the housing (7). The side of the mounting angle plate (23) near the slide rail (20) is fitted with the outer surface of the slide rail (20) and slides on the surface of the slide rail (20).

7. The laser measuring device for the pipe opening of a large-diameter anti-corrosion steel pipe for seawater transportation according to claim 6, characterized in that, A square hole is provided on the side surface of the housing (7), and a negative pressure fan (19) is fixedly installed in the square hole. The input end of the negative pressure fan (19) is connected to the isolation cavity.

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