An auxiliary device for establishing an optical measurement coordinate system

Abstract

The present invention discloses an auxiliary device for establishing an optical measurement coordinate system, comprising: a base; and a universal ball joint, which is rotatably arranged on the base; a main structure, which is fixedly connected to the universal ball joint, and the main structure comprises an x-axis, a y-axis and a z-axis and a first angle measuring instrument, a second angle measuring instrument and a third angle measuring instrument; wherein the x-axis, the y-axis and the z-axis are an integrated structure and are arranged perpendicular to each other, the first angle measuring instrument is arranged on the x-axis, the second angle measuring instrument is arranged on the y-axis, and the third angle measuring instrument is arranged on the z-axis. The present invention has the characteristics of high precision, high experimental efficiency and convenience.

Description

Technical Field

[0001] The present invention relates to the field of optical measurement technology, and more particularly to an auxiliary device for establishing an optical measurement coordinate system. Background Art

[0002] Optical measurement combines photoelectric technology, mechanical measurement, and computer technology, and uses optical measuring heads to record the dimensions, coordinate displacement, deformation strain, and other data of the measured object. Due to its advantages such as high measurement accuracy and speed, and no need to contact the measured object, optical measurement has become the focus of modern measurement and is widely used in mechanical manufacturing, aerospace, civil engineering, and other fields. Optical measurement in the automotive industry is mainly used for reverse engineering of automotive parts, displacement and strain measurement of material stretching, crushing, and destruction, and vibration testing.

[0003] When using optical measurement equipment to test automotive parts, whether measuring strain, displacement or scanning reverse, only data based on the whole vehicle coordinate system is of practical significance. At present, when testing automotive parts, it is necessary to separate them from the whole vehicle for separate experiments. Since they are separated from the whole vehicle environment, it is often impossible to directly obtain experimental data in the whole vehicle coordinate system. At present, the default coordinate system of the optical measurement equipment is generally used. When processing data, the coordinate transformation is performed using post-processing software according to the direction and position of the measured parts in the whole vehicle, and then the experimental data in the whole vehicle coordinate system is obtained. This method is complex and time-consuming, and the experimental efficiency is low. Summary of the invention

[0004] The purpose of the present invention is to design and develop an auxiliary device for establishing an optical measurement coordinate system. By adjusting the universal ball joint, the spatial rotation of the three coordinate axes of the main structure can be realized. At the same time, with the help of an angle measuring instrument to read the angle value, it can be adjusted to any angle required for the experiment, and the coordinate system of the entire vehicle can be quickly established. The data has high accuracy and the experimental data of automobile parts in the coordinate system of the entire vehicle can be obtained quickly and conveniently.

[0005] The technical solution provided by the present invention is:

[0006] An auxiliary device for establishing an optical measurement coordinate system, comprising:

[0007] Base; and

[0008] A universal ball joint, which is rotatably arranged on the base;

[0009] A main structure, which is fixedly connected to the universal ball joint, and the main structure includes an x-axis, a y-axis, a z-axis, and a first angle measuring instrument, a second angle measuring instrument, and a third angle measuring instrument;

[0010] The x-axis, y-axis and z-axis are an integrated structure and are arranged perpendicular to each other. The first angle measuring instrument is arranged on the x-axis, the second angle measuring instrument is arranged on the y-axis, and the third angle measuring instrument is arranged on the z-axis.

[0011] Preferably, the base comprises:

[0012] A first fixed base, which is a disc structure;

[0013] The second fixed base is fixed on the first fixed base, and the inner surface of the second fixed base is a curved surface.

[0014] Preferably, the universal ball joint comprises:

[0015] A fixed cover, which is detachably arranged on the second fixed base, and the inner surface of the fixed cover is a curved surface, and a spherical cavity is formed between the fixed cover and the second fixed base;

[0016] A ball head is disposed in the spherical cavity, and the diameter of the ball head is the same as the diameter of the spherical cavity;

[0017] A cylindrical screw has one end fixed on the ball head and the other end detachably arranged on the main structure.

[0018] Preferably, the x-axis, y-axis and z-axis are all provided with rectangular grooves, and the first angle measuring instrument, the second angle measuring instrument and the third angle measuring instrument are respectively interference-fitted with the rectangular grooves.

[0019] Preferably, the first angle measuring instrument, the second angle measuring instrument and the third angle measuring instrument are parallel to the length directions of the x-axis, the y-axis and the z-axis respectively.

[0020] Preferably, the x-axis, y-axis and z-axis are all cuboids.

[0021] Preferably, a plurality of digital dots symmetrically arranged at equal intervals are provided on each side surface of the x-axis, y-axis and z-axis.

[0022] Preferably, six digital dots are arranged on each side surface of the x-axis, y-axis and z-axis.

[0023] The beneficial effects of the present invention are:

[0024] The present invention designs and develops an auxiliary device for establishing an optical measurement coordinate system. The spatial rotation of the three coordinate axes of the main structure can be realized by adjusting the universal ball joint. At the same time, the angle value is read with the help of an angle measuring instrument installed on the coordinate axis of the main structure. The main structure can be adjusted to any angle required for the experiment. The optical measurement equipment is used to scan the marking points pasted on the coordinate axis of the main structure, so the coordinate system of the whole vehicle can be quickly established. The data has high accuracy and test efficiency, and the experimental data of automobile parts in the whole vehicle coordinate system can be easily and conveniently obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the auxiliary device for establishing an optical measurement coordinate system according to the present invention.

[0026] Figure 2 It is a structural schematic diagram of the base described in the present invention.

[0027] Figure 3 The figure is a schematic diagram of the exploded structure of the universal ball joint of the present invention.

[0028] Figure 4 It is a schematic diagram of the cross-sectional structure of the assembly of the base and the universal ball joint described in the present invention.

[0029] Figure 5 It is a structural schematic diagram of the main structure of the present invention.

[0030] Figure 6 It is a schematic structural diagram of side A of the present invention. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below so that those skilled in the art can implement it according to the description.

[0032] like Figure 1 As shown, the present invention provides an auxiliary device for establishing an optical measurement coordinate system, comprising: a base 110, a universal ball joint 120 and a main structure 130, wherein one end of the universal ball joint 120 is rotatably arranged on the base 110, and the main structure 130 is fixedly connected to the other end of the universal ball joint 120, and the spatial rotation of the main structure 130 can be achieved by adjusting the universal ball joint 120.

[0033] like Figure 2 , Figure 4As shown, the base is an integral structure, and the base 110 includes: a first fixed base 111, a second fixed base 112 and a plurality of first threaded holes 113, wherein the first fixed base 111 is a disc structure; the second fixed base 112 is fixed on the first fixed base 111, and the second fixed base 112 is a cylindrical structure, but the inner surface is a curved surface, and the size matches the ball head 122, and is used to place the lower half of the ball head 122, and a plurality of first threaded holes 113 are spaced apart on the upper surface of the second fixed base 112.

[0034] like Figure 3 , Figure 4 As shown, the universal ball joint 120 includes: a fixing cover 123, a ball head 122, a cylindrical screw 121, a plurality of through holes 124 and a plurality of fixing bolts 125, wherein the fixing cover 123 is arranged on the second fixing base 112, and the fixing cover 123 is provided with a plurality of through holes 124 matching the positions and sizes of the plurality of first threaded holes 113, the plurality of through holes 124 are arranged in a one-to-one correspondence with the plurality of first threaded holes 113, the sizes of the plurality of fixing bolts 125 match the plurality of first threaded holes 113 and the plurality of through holes 124, and the plurality of fixing bolts 125 pass through the plurality of first threaded holes 113 and the plurality of through holes 124 respectively and in a one-to-one correspondence. The first threaded hole 113 and multiple through holes 124 detachably fix the fixing cover 123 and the second fixing base 112. The inner surface of the fixing cover 123 is a curved surface, and its size matches the ball head 122, and is used to place the upper half of the ball head 122. A spherical cavity is formed between the fixing cover 123 and the second fixing base 112; the ball head 122 is spherical and is arranged in the spherical cavity, and the diameter of the ball head 122 is the same as the diameter of the spherical cavity; one end of the cylindrical screw 121 is an integral structure with the ball head 122, and the other end is detachably arranged on the main structure 130 through a thread.

[0035] A certain gap is left between the second fixed base 112 and the fixed cover 123. When the plurality of fixing bolts 125 are in a loose state, the ball head 122 can rotate freely in the inner curved surface space of the fixing cover 123 and the second fixed base 112, thereby driving the main structure 130 to move together. When the plurality of fixing bolts 125 are in a tightened state, the gap between the fixing cover 123 and the second fixed base 112 is reduced. At this time, the ball head 122 is clamped by the fixing cover 123 and the second fixed base 112, thereby achieving locking of the ball head 122.

[0036] like Figure 5As shown, the main structure 130 includes: an x-axis 131, a y-axis 132, and a z-axis 133, as well as a first angle measuring instrument 134, a second angle measuring instrument 135, and a third angle measuring instrument 136. The x-axis 131, the y-axis 132, and the z-axis 133 are connected and form an integral structure, and are perpendicular to each other in space. The cross-section of each coordinate axis is rectangular and has the same size. A rectangular groove is formed on each of the x-axis 131, the y-axis 132, and the z-axis 133. The first angle measuring instrument 134, the second angle measuring instrument 135, and the third angle measuring instrument 136 are connected and form an integral structure. The x-axis 131, the y-axis 132, and the z-axis 133 are each provided with a rectangular groove. The measuring instrument 135 and the third angle measuring instrument 136 are respectively installed in the rectangular groove and the connection method is a small interference fit. The first angle measuring instrument 134, the second angle measuring instrument 135 and the third angle measuring instrument 136 are respectively parallel to the length directions of the x-axis 131, the y-axis 132 and the z-axis 133. A second threaded hole 137 is opened at the bottom of the main structure 130 for connecting the main structure 130 and the universal ball joint. The size of the second threaded hole 137 matches the thread at the other end of the cylindrical screw 121.

[0037] like Figure 6 As shown, a number of digital marking points identifiable by the optical measuring equipment are pasted on the four side surfaces of each coordinate axis, which serve as reference points for establishing the coordinate system during optical scanning and measurement. Taking the A side of the x-axis 131 as an example, the center lines of the digital points P1, P2, and P3 and the center lines of the digital points P4, P5, and P6 pasted on the surface are parallel to the vertical axis of the A side, the center lines of the digital points P1 and P4, the center lines of the digital points P2 and P5, and the center lines of the digital points P3 and P6 are parallel to the horizontal axis of the A side, and the arrangement of the digital points on the other three side surfaces of the x-axis 131 and the four side surfaces of the y-axis 132 and the z-axis 133 is the same as that on the A side of the x-axis 131.

[0038] In this embodiment, the number of digital dots arranged on each side of the x-axis 131 , the y-axis 132 , and the z-axis 133 is 6.

[0039] The auxiliary device designed and developed by the present invention for establishing an optical measurement coordinate system is used to rotate the ball head 122 and read the angle values ​​displayed by the first angle measuring instrument 134, the second angle measuring instrument 135 and the third angle measuring instrument 136 according to the angles between the experimental parts and the X-axis, Y-axis and Z-axis of the whole vehicle coordinate system during experiments, and adjust the position of the main structure 130 so that the angles between the experimental parts and the three coordinate axes of the main structure are consistent with the angles between the experimental parts and the X-axis, Y-axis and Z-axis of the whole vehicle coordinate system, tighten a plurality of fixing bolts 125, lock the ball head 122, and keep the main structure 130 in the current spatial position unchanged, store the digital points on the x-axis 131, the y-axis 132 and the z-axis 133 in the computer through the camera, and use the digital points on the coordinate axes of the main structure 130 photographed in the scanning software or the measuring software to establish the spatial coordinate system. At this time, the coordinate system can restore the positional relationship between the experimental parts and the whole vehicle coordinate system, and then the experimental data of the experimental parts in the whole vehicle coordinate system can be conveniently and directly obtained.

[0040] The present invention provides an auxiliary device for establishing an optical measurement coordinate system. The spatial rotation of the three coordinate axes of the main structure can be realized by adjusting the universal ball joint. At the same time, the angle value is read with the help of an angle measuring instrument installed on the coordinate axis of the main structure. The main structure can be adjusted to any angle required for the experiment. The optical measurement equipment is used to scan the marking points pasted on the coordinate axis of the main structure, so that the coordinate system of the whole vehicle can be quickly established, and the experimental data of the automobile parts in the whole vehicle coordinate system can be easily and conveniently obtained.

[0041] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. An auxiliary device for establishing an optical measurement coordinate system, characterized in that: include: Base; as well as A universal ball joint, which is rotatably arranged on the base; A main structure, which is fixedly connected to the universal ball joint, and the main structure includes an x-axis, a y-axis, a z-axis, and a first angle measuring instrument, a second angle measuring instrument, and a third angle measuring instrument; The x-axis, y-axis and z-axis are an integrated structure and are arranged perpendicular to each other, the first angle measuring instrument is arranged on the x-axis, the second angle measuring instrument is arranged on the y-axis, and the third angle measuring instrument is arranged on the z-axis; The base comprises: A first fixed base, which is a disc structure; A second fixed base, which is fixed on the first fixed base, and the inner surface of the second fixed base is a curved surface; The universal ball joint comprises: A fixed cover, which is detachably arranged on the second fixed base, and the inner surface of the fixed cover is a curved surface, and a spherical cavity is formed between the fixed cover and the second fixed base; A ball head is disposed in the spherical cavity, and the diameter of the ball head is the same as the diameter of the spherical cavity; A plurality of fixing bolts are arranged between the second fixing base and the fixing cover so that the ball head can be selectively rotated or locked.

2. The auxiliary device for establishing an optical measurement coordinate system according to claim 1, characterized in that: The universal ball joint also includes: A cylindrical screw has one end fixed on the ball head and the other end detachably arranged on the main structure.

3. The auxiliary device for establishing an optical measurement coordinate system according to claim 2, characterized in that: The x-axis, y-axis and z-axis are all provided with rectangular grooves, and the first angle measuring instrument, the second angle measuring instrument and the third angle measuring instrument are respectively interference-fitted with the rectangular grooves.

4. The auxiliary device for establishing an optical measurement coordinate system according to claim 3, characterized in that: The first angle measuring instrument, the second angle measuring instrument and the third angle measuring instrument are parallel to the length directions of the x-axis, the y-axis and the z-axis respectively.

5. The auxiliary device for establishing an optical measurement coordinate system according to claim 4, characterized in that: The x-axis, y-axis and z-axis are all cuboids.

6. The auxiliary device for establishing an optical measurement coordinate system according to claim 5, characterized in that: A plurality of digital dots symmetrically arranged at equal intervals are arranged on each side surface of the x-axis, y-axis and z-axis.

7. The auxiliary device for establishing an optical measurement coordinate system according to claim 6, characterized in that: Six digital dots are arranged on each side surface of the x-axis, y-axis and z-axis.

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