Coaxial device, measurement system and method of binocular vision measurement system for closed tube

Abstract

The present invention discloses a coaxial device of a binocular vision measurement system for a closed pipe, comprising a mounting plate, a countersunk screw and a truncated cone, wherein the countersunk screw and the truncated cone are respectively mounted on both sides of the mounting plate, a coaxial conical hole is provided on the truncated cone, the truncated cone and the countersunk screw are coaxially arranged, an industrial strong magnet is installed on one side of the mounting plate located on the countersunk screw, and the industrial strong magnet is located; by arranging conical ends at both ends, the countersunk screw and the truncated cone are automatically aligned by using pre-tightening force. The present invention can measure the detailed spatial position of the flange to be measured, including the rotation angle and deflection angle of the flange, and the software automatically reads the measurement data and performs automatic calculations to achieve high-precision measurement of the closed pipe, while having the advantages of digitization, lightness, and high accessibility.

Description

Technical Field

[0001] The invention relates to a coaxial device, a measuring system and a measuring method of a binocular vision measuring system for a closed tube, and belongs to the field of closed tubes. Background Art

[0002] Ships are built in sections. Due to the accumulated errors in the manufacturing process, many closed pipes are produced in the shipbuilding process. The production of closed pipes usually adopts the molding method and on-site welding method. These two methods have the following disadvantages: (1) The precision is not high, and there will be 5% defective products. (2) The operation time is long, and accidents often occur during the handling operation, which poses a safety hazard. (3) Auxiliary tools such as flanges and angle irons are required, resulting in material waste. (4) There is a fire hazard in the welding and cutting operations inside the ship. (5) It requires skilled and experienced professional technicians to complete the production. The most difficult part in pipeline production is to "ensure the good precision of the finished product." However, the above two methods often result in the incorrect position of the bolt holes of the flange of the closed pipe, which makes it impossible to install.

[0003] Patent ZL 2011 1 0309478.9 provides a system for measuring and reproducing a closed pipe and a method for measuring and reproducing the closed pipe. The method can solve the measurement and reproduction of the closed pipe. However, during use, the closed pipe with obstacles in the middle or the pipe diameter less than 76 cannot be measured, which will cause the closed pipes of the whole ship to not be 100% measured, causing great trouble to the on-site construction. The high-precision binocular imaging measurement method for the closed pipe of the present invention can measure the spatial position of the two flanges on site through binocular measurement plus a dedicated target and a measuring head. The measurable pipe diameter range is larger, and the closed pipe with obstacles in the middle can also be measured. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a coaxial device, a measuring system and a method for a binocular vision measuring system for a closed pipe. The method can measure the detailed spatial position of the flange to be measured, including the positional relationship between the flange and the flange hole. The software automatically reads the measurement data and performs automatic calculations to achieve high-precision measurement of the closed pipe. The method also has the advantages of digitization, portability and high accessibility.

[0005] Technical solution: To solve the above technical problems, the coaxial device of the binocular vision measurement system for the closed pipe of the present invention comprises a mounting plate, a countersunk screw and a truncated cone. The countersunk screw and the truncated cone are respectively mounted on both sides of the mounting plate. A coaxial conical hole is provided on the truncated cone. The truncated cone and the countersunk screw are coaxially arranged. An industrial strong magnet is installed on the side of the mounting plate located on the countersunk screw. Conical ends are arranged at both ends, and the countersunk screw and the truncated cone are automatically aligned by pre-tightening force. With this device, the axis coordinates of the flange hole can be measured very cleverly, which plays a very important role in reproducing the flange position. In addition, the assembly is simple, which solves the problem of how to measure the axis of the flange hole.

[0006] Preferably, it comprises the coaxial device as claimed in claim 1, a binocular high-precision three-dimensional measurement system and a target, wherein the target comprises a body, a measuring head is arranged at the end of the body, at least two target plates are arranged on the body, and three or four circular holes are arranged on the target plates.

[0007] Preferably, there are three target plates, which are distributed on both sides of the main body. Three circular holes are provided on the two target plates on one side, and the centers of the three circular holes are distributed in an equilateral triangle. Four circular holes are provided on a target plate on the other side, and the centers of the four circular holes are distributed in a square.

[0008] Preferably, the measuring head is spherical.

[0009] A measurement method for a closed tube binocular vision measurement system comprises the following steps:

[0010] (1) Fix the binocular high-precision 3D measurement system on a tripod or with screws;

[0011] (2) Model the target and measure the relative position of the circular hole on the target plate and the relative position of the center of the measuring head;

[0012] (2) Install the coaxial device for measuring the closed pipe target on any flange hole of the flange;

[0013] (3) Turn on the binocular measurement handheld terminal;

[0014] (4) Place the measuring head of the target into the conical hole of the measuring head for measuring the closed pipe target, adjust the target angle, and all target points can be seen in the handheld terminal. Click to measure and collect data;

[0015] (5) Move the measuring head for the closed pipe target measurement to another flange hole of the flange, repeat the measurement steps (2) to (4), and measure three points;

[0016] (6) Move the measuring head for the closed pipe target measurement to another flange hole and repeat the measurement steps (2) to (4) to measure three points;

[0017] (7) By importing the above image and two sets of measurement points into a computer, the relative position relationship of the two flanges and the position of the flange holes can be calculated.

[0018] In the present invention, the binocular high-precision three-dimensional measurement system is composed of two high-precision industrial cameras, two high-precision lenses, a central processing unit, a battery module, etc., and is the basis of the entire method. The above-mentioned target is mainly imaged in the binocular high-precision three-dimensional measurement system through the calibrated reflection points on the target, and the coordinates of the measurement points relative to the camera are calculated. It is mainly composed of a special measuring head, a reflection target, a battery module and a communication module. The above-mentioned measuring head for measuring the closed pipe target: mainly composed of a measuring head plate, an industrial strong magnet, a mounting screw and a high-precision positioning conical hole, etc. It is used to locate the center position of the flange screw eye. The above-mentioned binocular measurement handheld terminal is mainly composed of a handheld terminal body and measurement software. It is used to complete human-computer dialogue and measurement data collection.

[0019] Beneficial effects: The binocular vision measurement system for closed pipes of the present invention can measure the detailed spatial position of the flange to be measured, including the rotation angle and deflection angle of the flange. The software automatically reads the measurement data and performs automatic calculations to achieve high-precision measurement of the closed pipe. It also has the advantages of digitization, portability, and high accessibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a system schematic diagram of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the measuring head.

[0022] Figure 3 Schematic diagram of the target structure. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] like Figures 1 to 3As shown, the binocular vision measurement system for a closed pipe of the present invention comprises a binocular high-precision three-dimensional measurement system 1, a coaxial device 2 and a target 3, wherein the coaxial device 2 is installed in a flange 4 hole of a flange 4, and the target 3 is inserted into the coaxial device 2; the coaxial device 2 comprises a mounting plate, a countersunk screw 22 and a truncated cone 21, wherein the countersunk screw 22 and the truncated cone 21 are respectively installed on both sides of the mounting plate, a coaxial conical hole is provided on the truncated cone 21, the truncated cone 21 is coaxially arranged with the countersunk screw 22, and an industrial strong magnet 23 is installed on the surface of the mounting plate located on one side of the countersunk screw 22; the target 3 comprises a body 34, a measuring head 31 is provided at the end of the body 34, the measuring head 31 is spherical, at least two target plates 32 and a switch 33 are provided on the body 34, and three or four circular holes are provided on the target plate 32.

[0025] In the present invention, there are three target plates 32, which are distributed on both sides of the body 34. Three circular holes are provided on the two target plates 32 on one side, and the centers of the three circular holes are distributed in an equilateral triangle. Four circular holes are provided on the target plate 32 on the other side, and the centers of the four circular holes are distributed in a square.

[0026] A measurement method of the above-mentioned closed tube binocular vision measurement system comprises the following steps:

[0027] (1) Fix the binocular high-precision three-dimensional measurement system 1 on a tripod or with screws;

[0028] (2) Modeling the target 3, measuring the relative position of the circular hole on the target plate 32 and the relative position of the center of the measuring head 31;

[0029] (2) Install the coaxial device 2 for measuring the closed pipe target 3 on any flange 4 hole of the flange 4;

[0030] (3) Turn on the binocular measurement handheld terminal 6;

[0031] (4) Place the measuring head 31 of the target 3 into the conical hole of the measuring head 31 for measuring the closed pipe target 3, adjust the angle of the target 3, and all target points can be seen in the handheld terminal 6. Click to measure and collect data;

[0032] (5) Move the measuring head 31 of the closed pipe target 3 to another hole of the flange 4, repeat the measuring steps (2) to (4), and measure three points;

[0033] (6) Move the measuring head 31 of the closed pipe target 3 to another flange 4 hole, repeat the measuring steps (2) to (4), and measure three points;

[0034] (7) By importing the above-mentioned image and two sets of measurement points into a computer, the relative position relationship between the two flanges 4 and the position of the holes of the flange 4 can be calculated.

[0035] The principle of the present invention is as follows: by setting a marking point on the target plate 32, the relative position relationship between the marking point and the measuring head 31 is obtained through modeling, and the size of the marking point in the camera coordinate system is measured on the binocular high-precision three-dimensional measurement system 1. Through the relative position relationship between the marking point and the measuring head 31, the size of the center of the measuring head 31 in the camera coordinate system, that is, the coordinates of a point on the axis of the flange 4 hole, can be obtained; the coordinate equation of the flange 4 surface can be obtained through the binocular high-precision three-dimensional measurement system 1. Since the axis of the flange 4 hole is perpendicular to the flange 4 surface, and the coordinates of a certain point on the axis of the flange 4 hole are known, the coordinates of the intersection of the surface of the flange 4 and the axis of the flange 4 hole can be obtained. Through the coordinates of the three measuring points, the size of the diameter of the circle of the center of the flange 4 hole on the flange 4 surface can be obtained. After determining the position and distribution of the flange 4 holes, the relative position relationship between the two flanges 4 can be obtained, and the size of the closed tube can be obtained through modeling.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A measurement method of a binocular vision measurement system for a closed tube, the measurement system comprising a coaxial device, a binocular high-precision three-dimensional measurement system and a target, the target comprising a body, a measuring head being arranged at the end of the body, at least two target plates being arranged on the body, three or four circular holes being arranged on the target plates, the measuring head being spherical, the coaxial device comprising a mounting plate, a countersunk screw and a truncated cone, the countersunk screw and the truncated cone being respectively mounted on both sides of the mounting plate, a coaxial conical hole being arranged on the truncated cone, the truncated cone being coaxially arranged with the countersunk screw, an industrial strong magnet being installed on one side of the mounting plate located at the countersunk screw; conical ends are arranged at both ends, and the countersunk screw and the truncated cone are automatically aligned by the pre-tightening force of the threaded connection between the countersunk screw and the truncated cone, characterized in that The following steps are involved: (1) Fix the binocular high-precision 3D measurement system on a tripod or with screws; (2) Model the target and measure the relative position of the circular hole on the target plate and the relative position of the center of the measuring head; (2) Install the coaxial device for measuring the closed pipe target on any flange hole of the flange; (3) Turn on the binocular measurement handheld terminal; (4) Place the measuring head of the target into the conical hole of the measuring head for measuring the closed pipe target, adjust the target angle, and all target points can be seen in the handheld terminal. Click to measure and collect data; (5) Move the measuring head for the closed pipe target measurement to another flange hole of the flange, repeat the measurement steps (2) to (4), and measure three points; (6) Move the measuring head for the closed pipe target measurement to another flange hole and repeat the measurement steps (2) to (4) to measure three points; (7) By importing the image of the binocular high-precision 3D measurement system and the two sets of measurement points into the computer, the relative position relationship of the two flanges and the position of the flange holes can be calculated.

2. The measurement method of the binocular vision measurement system for closed pipes according to claim 1 is characterized in that: There are three target plates, which are distributed on both sides of the main body. Three circular holes are arranged on the two target plates on one side, and the centers of the three circular holes are distributed in an equilateral triangle. Four circular holes are arranged on a target plate on the other side, and the centers of the four circular holes are distributed in a square.

Images