A laser-induced underground pipeline bending angle measuring device

Abstract

The application discloses a kind of underground pipeline bend angle measuring devices based on laser induction, including ball hinge and optical angle measuring instrument, optical angle measuring instrument includes plane mirror, laser, receiving assembly and signal processing unit, plane mirror is set on the section of sphere, the output beam of laser is directed to plane mirror, receiving assembly includes circuit vertical plate and multiple photosensitive elements, circuit vertical plate is arranged between laser and plane mirror, the center of circuit vertical plate is provided with light hole, multiple photosensitive elements are distributed in circuit vertical plate with light hole as origin in plane coordinate system array, receiving assembly connects signal processing unit;The application provides a kind of underground pipeline bend angle measuring devices based on laser induction, realizes non-contact angle measurement, ensures the accuracy of measurement data when approaching measurement extreme value.

Description

TECHNICAL FIELD

[0001] The application relates to a laser induction-based underground pipeline bending angle measuring device. BACKGROUND

[0002] Urban underground pipelines mainly include drainage, tap water, power and gas, etc., when construction is carried out around the underground pipelines, the positions of the underground pipelines need to be determined, in the case that the position data of the underground pipelines are lost or difficult to obtain, workers need to carry out on-site detection, and in underground pipeline positioning work, there are mainly geophysical prospecting and touch detection methods.

[0003] A patent document with the authorized announcement number CN112782779B discloses an underground pipeline positioning device, which comprises a front guide assembly and a rear guide assembly, a spherical hinge joint is arranged between the front guide assembly and the rear guide assembly, a pull rope for measuring the moving distance of the front guide assembly is connected to the front guide assembly, and an angle measuring instrument is arranged between the front guide assembly and the rear guide assembly; the rotation of the spherical hinge joint is driven by pipeline bending, the rotation angle is converted into the transverse and longitudinal movement amounts of the end of the fixed rod by the angle measuring instrument, and then the underground pipeline bending angle is measured.

[0004] However, in the above structure, the movement of the fixed rod on the spherical hinge joint limits the measurable angle range, and even when the measurement limit range is approached, the movement limitation of the fixed rod will interfere with the conversion of the angle into the transverse and longitudinal movement amounts, so that the measurement data is wrong. SUMMARY

[0005] The application aims to provide a laser induction-based underground pipeline bending angle measuring device, which realizes non-contact angle measurement through displacement sensing of a light spot, and ensures the accuracy of the measurement data when the measurement limit is approached.

[0006] To achieve the above-mentioned purpose, the technical scheme of the application is to design a laser induction-based underground pipeline bending angle measuring device, which comprises a front guide body and a rear guide body, the front guide body and the rear guide body are both cylindrical, a spherical hinge joint is arranged between the front guide body and the rear guide body, the spherical hinge joint comprises a hemispherical shell and a ball, the ball is fixed to the rear end of the front guide body through a connecting rod, and the center line of the front guide body passes through the ball center of the ball, the hemispherical shell is fixed to the front end of the rear guide body, and the center line of the rear guide body passes through the ball center of the hemispherical shell, and the ball is hingedly connected in the hemispherical shell;

[0007] The underground pipeline bending angle measuring device can move in the underground pipeline, when the front guide body and the rear guide body pass through the turning part of the pipeline, the spherical hinge between the front guide body and the rear guide body rotates following the pipeline, and the rotation angle of the sphere in the hemispherical shell can be obtained by measuring the rotation angle of the sphere in the hemispherical shell, which includes the direction and the degree of the turning angle.

[0008] The rear guide body is internally provided with an optical angle measuring instrument, which comprises a plane mirror, a laser, a receiving assembly and a signal processing unit, the plane mirror is arranged on the tangent plane of the sphere, the output beam of the laser is directed to the plane mirror, the receiving assembly comprises a circuit vertical plate and a plurality of photosensitive elements, the circuit vertical plate is arranged between the laser and the plane mirror, the circuit vertical plate is perpendicular to the output beam, a light transmission hole is formed in the center of the circuit vertical plate, and the plurality of photosensitive elements are arranged in a planar coordinate system array on the reflected light receiving surface of the circuit vertical plate with the light transmission hole as the origin, and the receiving assembly is connected with the signal processing unit.

[0009] By adopting the above technical scheme, the output beam of the laser passes through the light transmission hole and is irradiated on the plane mirror, when the sphere rotates in the hemispherical shell, the plane mirror rotates with the sphere center as the midpoint, the output beam is reflected on the circuit vertical plate by the plane mirror, and a light spot is formed on the circuit vertical plate, the photosensitive elements irradiated by the light spot generate electric signals, the plurality of photosensitive elements are arranged in a planar coordinate system array on the circuit vertical plate, and the azimuth of the light spot in the planar coordinate system and the distance a from the light spot to the light transmission hole can be obtained through the signal processing unit, the distance b from the circuit vertical plate to the sphere center is a preset value, and the distance c from the sphere center to the center of the plane mirror is a fixed value, and the rotation angle of the sphere, that is, the angle of the pipeline turning, can be obtained through the calculation of the right triangle function.

[0010] Preferably, the upper and lower sides of the rear guide body are provided with sliding grooves, same-direction extending screws are arranged in the sliding grooves, motors are arranged at the ends of the screws, sliding blocks are arranged on the screws and move along the sliding grooves, the circuit vertical plate is fixed between the two sliding blocks, and a distance measuring instrument is arranged at the end of the sliding groove close to the sphere, and the distance measuring instrument is used to measure the distance from the circuit vertical plate to the sphere center.

[0011] By adopting the technical scheme, the circuit vertical plate can be translated along the sliding groove between the laser and the plane mirror. Since the area of the reflected light receiving surface of the circuit vertical plate is limited, the number and position of the photosensitive elements distributed on the reflected light receiving surface are unchanged, and the distribution density of the photosensitive elements is proportional to the measurement accuracy. When the measurement starts, the circuit vertical plate is located at one end far away from the plane mirror, and the distance from the circuit vertical plate to the plane mirror is the farthest. The sensing accuracy of the photosensitive elements on the reflected light receiving surface to the light spot movement is the highest. When the light spot moves from the center point to the edge and approaches the edge, the motor is started, the motor drives the screw to rotate, the sliding block drives the circuit vertical plate to move along the sliding groove and approach the plane mirror, and the optical angle measuring instrument is increased in the range of the measurable angle by using the principle that the distance between the two sides of the angle from the vertex of the angle is farther, and the two sides are opened wider.

[0012] Preferably, the plane mirror is parallel to the circuit vertical plate in the state that the pipeline does not appear a bending angle.

[0013] Preferably, the output light beam, the light transmission hole and the center of the sphere are on the same straight line.

[0014] Preferably, the signal processing unit controls the motor.

[0015] The advantages and beneficial effects of the present application are as follows:

[0016] 1. The output light beam of the laser replaces the fixed rod, the output light beam projects a light spot on the receiving assembly, the photosensitive elements sense the displacement of the light spot, the non-contact angle measurement is realized, the problem that the fixed rod moves within a limited range and interferes with the measurement near the measurement extreme value to obtain incorrect measurement data is avoided.

[0017] 2. By arranging the movable circuit vertical plate between the laser and the plane mirror, the circuit vertical plate is arranged to approach the plane mirror according to the principle that the distance between the two sides of the angle from the vertex of the angle is farther, and the two sides are opened wider, the number and position of the photosensitive elements distributed on the reflected light receiving surface of the circuit vertical plate remain unchanged, the farther the distance between the circuit vertical plate and the plane mirror, the higher the sensing accuracy of the photosensitive elements to the light spot movement, when the light spot moves from the center point to the edge and approaches the edge, the circuit vertical plate approaches the plane mirror, and the range of the measurable angle is increased. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is a schematic diagram of the present application.

[0019] Fig. 2 is a schematic diagram of the receiving assembly of the present application.

[0020] Fig. 3 is a schematic diagram of the optical path of the present application. DETAILED DESCRIPTION

[0021] The specific embodiments of the present application are further described below in conjunction with the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.

[0022] The technical solutions of the specific embodiments of the present application are as follows:

[0023] As shown in the drawings, a laser-induced underground pipeline bend angle measuring device comprises a front guide body 1 and a rear guide body 2, both of which are cylindrical, and a spherical hinge element 3 is arranged between the front guide body 1 and the rear guide body 2, the spherical hinge element 3 comprises a hemispherical shell 4 and a spherical body 5, the spherical body 5 is fixed to the rear end of the front guide body 1 through a connecting rod, and the center line of the front guide body 1 passes through the spherical center of the spherical body 5, the hemispherical shell 4 is fixed to the front end of the rear guide body 2, and the center line of the rear guide body 2 passes through the spherical center of the hemispherical shell 4, and the spherical body 5 is hingedly fitted in the hemispherical shell 4. Figs. 1 to 3 By adopting the above technical solutions, the above underground pipeline bend angle measuring device can move in the underground pipeline, when the front guide body 1 and the rear guide body 2 pass through the turning part of the pipeline, the spherical hinge element 3 between the front guide body 1 and the rear guide body 2 follows the pipeline to form rotation, and by measuring the rotation angle of the spherical body 5 in the hemispherical shell 4, the angle of the pipeline turning can be obtained, which includes the direction and the degree of the angle.

[0024] The interior of the rear guide body 2 is provided with an optical angle measuring instrument, the optical angle measuring instrument comprises a plane mirror 6, a laser 7, a receiving assembly 8 and a signal processing unit (not shown in the figure), the plane mirror 6 is arranged on the tangent plane of the spherical body 5, the output beam of the laser 7 is directed to the plane mirror 6, the receiving assembly 8 comprises a circuit vertical plate 9 and a plurality of photosensitive elements 10, the circuit vertical plate 9 is arranged between the laser 7 and the plane mirror 6, the circuit vertical plate 9 is perpendicular to the output beam, a light transmission hole 11 is formed in the center of the circuit vertical plate 9, and the plurality of photosensitive elements 10 are arranged in a planar coordinate system array on the reflected light receiving surface of the circuit vertical plate 9 with the light transmission hole 11 as the origin, and the receiving assembly 8 is connected to the signal processing unit.

[0025]

[0026] ​By adopting the technical scheme, the output light beam of the laser 7 is irradiated on the plane mirror 6 through the light transmission hole 11, the plane mirror 6 is arranged on the tangent plane of the sphere 5, when the sphere 5 rotates in the hemispherical shell 4, the plane mirror 6 rotates with the center of the sphere as the midpoint, the output light beam is reflected on the circuit vertical plate 9 by the plane mirror 6, the light spot is formed on the circuit vertical plate 9, the photosensitive element 10 irradiated by the light spot generates an electric signal, since the plurality of photosensitive elements 10 are arranged in a planar coordinate system on the circuit vertical plate 9, the azimuth of the light spot on the planar coordinate system and the distance a of the light spot to the light transmission hole 11 can be obtained through the signal processing unit, the distance b of the circuit vertical plate 9 to the center of the sphere 5 is a preset value, the distance c of the center of the sphere 5 to the center of the plane mirror 6 is a fixed value, the rotation angle of the sphere 5, that is, the angle of the pipeline turning, can be obtained through the calculation of the right triangle function.

[0027] Preferably, the upper and lower sides of the rear guide body 2 are provided with sliding grooves 12, the sliding grooves 12 are provided with screw rods 13 extending in the same direction, the ends of the screw rods 13 are provided with motors 14, the screw rods 13 are provided with sliding blocks 15 moving along the sliding grooves 12, the circuit vertical plate 9 is fixed between the two sliding blocks 15, the end of the sliding groove 12 close to the sphere 5 is provided with a distance meter 16, and the distance meter 16 is used for measuring the distance of the circuit vertical plate 9 to the center of the sphere 5.

[0028] By adopting the technical scheme, the circuit vertical plate 9 can translate along the sliding groove 12 between the laser 7 and the plane mirror 6, since the area of the reflected light receiving surface of the circuit vertical plate 9 is limited, the number and position of the photosensitive elements 10 distributed on the reflected light receiving surface are unchanged, the distribution density of the photosensitive elements 10 is proportional to the measurement accuracy, when the measurement starts, the circuit vertical plate 9 is located at the end far away from the plane mirror 6, the distance between the circuit vertical plate 9 and the plane mirror 6 is the farthest, the sensing accuracy of the photosensitive elements 10 on the reflected light receiving surface to the movement of the light spot is the highest, when the light spot moves from the center point to the edge and approaches the edge, the motor 14 is started, the motor 14 drives the screw rod 13 to rotate, the sliding block 15 drives the circuit vertical plate 9 to move along the sliding groove 12 and approach the plane mirror 6, the range of the measurable angle of the optical angle measuring instrument is increased by using the principle that when the angle of the angle is unchanged, the farther the two sides of the angle are from the vertex of the angle, the larger the opening between the two sides is.

[0029] Preferably, the plane mirror 6 is parallel to the circuit vertical plate 9 when the pipeline does not appear the turning angle.

[0030] Preferably, the output light beam, the light transmission hole 11 and the center of the sphere 5 are on the same straight line.

[0031] Preferably, the signal processing unit is connected with the motor 14.

[0032] The underground pipeline bending angle measuring method based on the light beam sensing first moves the underground pipeline bending angle measuring device in the underground pipeline, converts the bending angle of the position to be measured in the underground pipeline into the rotating angle of the sphere 5 by using the spherical hinge 3 between the front guide body 1 and the rear guide body 2, and specifically comprises the following steps.

[0033] The circuit vertical plate 9 is moved to the end far from the plane mirror 6, so that the sensing precision of the photosensitive element 10 to the moving light spot is the highest, the output light beam of the laser 7 passes through the light passing hole 11 and irradiates on the plane mirror 6 of the sphere 5, when the sphere 5 rotates, the output light beam is reflected to the circuit vertical plate 9 by the plane mirror 6, the moving light spot is formed on the circuit vertical plate 9, the light spot is converted into an electric signal by the photosensitive element 10 and is transmitted to the signal processing unit, the position of the photosensitive element 10 in the plane coordinate system array can be obtained by the signal processing unit according to the data processing, when the light spot moves from the center point to the edge and approaches the edge, the motor 14 is started, the motor 14 drives the screw rod 13 to rotate, the sliding block 15 drives the circuit vertical plate 9 to move to the plane mirror 6 along the sliding groove 12, and the range of the measurable angle is increased, when the light spot stops moving, the motor 14 stops, the circuit vertical plate 9 stops moving, and the distance between the circuit vertical plate 9 and the sphere center of the sphere 5 is obtained by the distance measuring instrument 16, the rotating angle of the sphere, that is, the angle of the pipeline bending can be obtained by the computer data processing. ;

[0034]

[0035] In the formula: is the distance from the origin (light passing hole) in the plane coordinate system array to the light spot;

[0036] is the distance from the circuit vertical plate to the sphere center;

[0037] is the vertical distance from the sphere center to the center of the plane mirror.

[0038] The above only describes the preferred embodiments of the present application, and it should be noted that, for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A laser-sensing-based underground pipeline bending angle measuring device, comprising a front guide body and a rear guide body, wherein a ball joint is provided between the front guide body and the rear guide body, the ball joint comprising a hemispherical shell and a sphere, wherein the sphere is hinged within the hemispherical shell, characterized in that: The rear guide body is equipped with an optical angle measuring instrument, which includes a plane mirror, a laser, a receiving component, and a signal processing unit. The plane mirror is disposed on the cross-section of the sphere, and the output beam of the laser is directed toward the plane mirror. The receiving component includes a circuit vertical plate and multiple photosensitive elements. The circuit vertical plate is disposed between the laser and the plane mirror and is perpendicular to the output beam. A light-transmitting hole is opened at the center of the circuit vertical plate. Multiple photosensitive elements are distributed in a planar coordinate system array with the light-transmitting hole as the origin on the reflective light receiving surface of the circuit vertical plate. The receiving component is connected to the signal processing unit. The rear guide body has grooves on its upper and lower sides, and a screw extending in the same direction is provided in the groove. A motor is provided at the end of the screw. A slider that moves along the groove passes through the screw. The circuit vertical plate is fixed between the two sliders. A rangefinder is provided at the end of the groove near the sphere. The rangefinder is used to measure the distance from the circuit vertical plate to the center of the sphere. Using the ball joint between the front and rear guide bodies, the bending angle of the underground pipeline to be measured is converted into the rotation angle of the sphere. Specifically, the process involves: moving the circuit vertical plate to the end away from the plane mirror to maximize the sensing accuracy of the photosensitive element in detecting the movement of the light spot; the output beam of the laser passing through the light-transmitting hole and illuminating the plane mirror of the sphere; when the sphere rotates, the output beam is reflected by the plane mirror onto the circuit vertical plate, forming a moving light spot on the circuit vertical plate; the light spot is converted into an electrical signal by the photosensitive element and transmitted to the signal processing unit; the signal processing unit can obtain the position of the photosensitive element in the plane coordinate system array based on the data processing; when the light spot moves from the center point to the edge and approaches the edge, the motor starts, and the motor drives the screw to rotate, causing the slider to move along the slide groove and move the circuit vertical plate closer to the plane mirror, increasing the range of measurable angles; when the light spot stops moving, the motor stops, the circuit vertical plate stops moving, the rangefinder obtains the distance from the circuit vertical plate to the center of the sphere, and after data processing, the rotation angle of the sphere, which is the angle x of the pipeline turning, can be obtained. In the formula: a is the distance from the light aperture to the light spot in the planar coordinate system array; b is the distance from the circuit vertical plate to the center of the sphere; c is the vertical distance from the center of the sphere to the center of the plane mirror.

2. The laser-induced based underground pipeline bend angle measuring device according to claim 1, characterized in that, When the pipe is not bent, the plane mirror is parallel to the circuit vertical plate.

3. The laser-sensing-based underground pipeline bending angle measuring device according to claim 2, characterized in that, The output beam, the light aperture, and the center of the sphere are on the same straight line.

4. The laser-sensing-based underground pipeline bending angle measuring device according to claim 3, characterized in that, The signal processing unit controls the motor.

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