CN213067453U - Dimension measuring instrument based on machine vision - Google Patents

Abstract

A dimension measuring instrument based on machine vision comprises a fixed frame, an operation table, a detection table, a light source and a camera; the detection table, the light source and the camera are arranged on the fixing frame; a through hole is formed in the middle of the detection table, an object carrying plate is arranged at the through hole, and the object carrying plate is made of transparent materials; the light source is arranged below the detection platform and corresponds to the object carrying plate; the camera is arranged on the camera fixing plate right above the object carrying plate; the light source is arranged on the light source fixing plate below the carrying plate; the operating platform is electrically connected with the light source and the camera; the micro-adjusting knobs are arranged at the four corners of the carrying plate, so that the telecentric coaxial lens and the carrying plate are arranged in parallel; through at the camera fixed plate with examine to set up laser rangefinder between the test table to set up perpendicular high accuracy and adjust the slide rail examining between test table and the mount, guarantee the camera fixed plate and examine parallel arrangement between the test table.

Description

Dimension measuring instrument based on machine vision

Technical Field

The utility model relates to a size measurement device especially relates to a size measurement appearance based on machine vision.

Background

At present, mechanical processing training courses are set for specific major in domestic colleges and universities, wherein students are generally examined in the training process or at the end of the training, and one widely-used examination project is to require the students to design and manufacture mechanical workpieces according to the requirements of questions, and the mechanical workpieces are compared with standard parts or requirements according to indexes such as accurate values and tolerances by measuring the size specifications of the mechanical workpieces so as to score the works of the students. At present, the traditional measuring tools such as a vernier caliper, a micrometer and the like are still adopted in schools for manual detection, and the size specification of a mechanical workpiece is obtained.

The following drawbacks exist with conventional measuring tools: 1. time is consumed for positioning the measurement object; 2. the more measurement positions of a single measurement object, the longer the time consumption; 3. the long-time measurement causes various burdens such as eye fatigue on the measuring staff; 4. the measurement position is judged by a measurer, so that the measurement result is different from person to person; 5. human errors also exist in the measurement readings; 6. the measured data needs to be manually input and counted by measuring personnel, the time consumption is long, the efficiency is low, and errors are easy to occur.

On the other hand, the current assessment and test method of the machining training course does not have the following functions: 1. the examination questions are intelligently acquired through the server, and the randomness of the examination questions is ensured; 2. in the examination process, the size measurement result of the part manufactured by the examinee is bound according to the identity information of the examinee, so that the accuracy of the examination score is ensured; 3. the measurement result is evaluated in real time according to the examination requirement, and a teacher does not need to manually input the examination result, so that the efficiency is improved, and mistakes are not easy to make; 4. aiming at the special examination scene of the mechanical processing course in colleges and universities, only the front and side surfaces of the same part are required to be measured, and the measurement result is uploaded to the server after the measurement is completed, so that the examination score is obtained, and the method is accurate and efficient.

Therefore, a device and a method for detecting and scoring the mechanical part machined parts manufactured by students are needed to be capable of achieving high efficiency and intellectualization.

Disclosure of Invention

The utility model aims at solving the deficiencies of the prior art, providing a dimensional measurement appearance based on machine vision, simple structure, convenient to use.

A dimension measuring instrument based on machine vision comprises a fixed frame, an operation table, a detection table, a light source and a camera; the detection table, the light source and the camera are arranged on the fixing frame; a through hole is formed in the middle of the detection table, an object carrying plate is arranged at the through hole, and the object carrying plate is made of transparent materials; the light source is arranged below the detection platform and corresponds to the object carrying plate; the camera is arranged on the camera fixing plate right above the object carrying plate; the light source is arranged on the light source fixing plate below the carrying plate; the operating platform is electrically connected with the light source and the camera; a telecentric coaxial lens is arranged at the lens of the camera.

Furthermore, a fine adjustment knob is arranged between the object carrying plate and the detection table.

Furthermore, a bracket is arranged on the detection table and is positioned on the object carrying plate; the middle part of the bracket is provided with a groove.

Furthermore, a vertical high-precision adjusting slide rail is arranged between the detection table and the fixed frame; the vertical high-precision adjusting slide rails are positioned at four corners of the detection platform.

Further, a laser ranging device is arranged between the camera fixing plate and the detection table; the laser ranging device comprises a laser ranging sensor transmitting head and a laser ranging receiver; laser rangefinder receiver sets up on four angles that detect the platform, and laser rangefinder sensor transmission head sets up on four angles that are used for camera fixed plate lower surface, and laser sensor transmission head is just to laser rangefinder receiver setting.

Furthermore, the whole fixed frame is in a shape of a straight quadrangular prism, and the inside of the fixed frame is hollow.

Further, the fixing frame is arranged above the optical shock insulation table; four corners at the bottom of the optical shock insulation table are provided with Fu horse wheels.

Furthermore, a transparent checkerboard and an identity card reader are further arranged on the detection table.

Further, the operation panel is arranged above the camera fixing plate and comprises a display module.

The utility model has the advantages that:

the micro-adjusting knobs are arranged at the four corners of the carrying plate, so that the telecentric coaxial lens and the carrying plate are arranged in parallel;

the laser distance measuring device is arranged between the camera fixing plate and the detection table, and the vertical high-precision adjusting slide rail is arranged between the detection table and the fixing frame, so that the camera fixing plate and the detection table are arranged in parallel;

setting a transparent checkerboard on a detection table, calibrating a flat field of a camera and calculating the image magnification;

by arranging the bracket and the grooves on the bracket, the heights of the acquired images are close when the front surface of the part to be detected is arranged upwards and the side surface of the part to be detected is arranged upwards, so that the image amplification rates of the cameras are consistent, the dependence on the depth of a lens is reduced, the system error caused by long-distance lifting or descending of the camera is avoided, and the precision is improved;

by arranging the bracket, the parts to be detected can be placed as far as possible according to the set standard, and the front image and the side image which are easy to compare with the parts to be detected are obtained; on the other hand, through setting up the difficult gliding transparent support, can guarantee to wait to detect the part and acquire the in-process of image at the camera and keep stable.

Drawings

Fig. 1 is a perspective view of a first embodiment of the present invention;

fig. 2 is a front view of a first embodiment of the present invention;

fig. 3 is a schematic view of a main body part of a first embodiment of the present invention;

fig. 4 is a schematic view of a detection table according to a first embodiment of the present invention.

The attached drawings indicate the following: the device comprises a fixed frame 1, a camera fixing plate 11, a light source fixing plate 12, an optical shock isolation table 13, an operation table 2, a display module 21, a detection table 3, a laser distance measuring device 31, an object carrying plate 32, a fine adjustment knob 33, a support 34, a vertical high-precision adjustment slide rail 35, a transparent checkerboard 36, an identity card reader 37, a light source 4, a camera 5 and a telecentric coaxial lens 51.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic concept of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.

The first embodiment is as follows:

as shown in fig. 1, a dimension measuring instrument based on machine vision includes an operation table 2, an inspection table 3, a light source 4, and a camera 5. A through hole is formed in the middle of the detection table 3, an object carrying plate 32 is arranged at the through hole, and the object carrying plate 32 is made of transparent materials; the light source 4 is arranged below the detection table 3 and corresponds to the object carrying plate 32; the camera 5 is arranged right above the carrying plate 32, and the camera 5 is positioned on the camera fixing plate 11; the console 2 is electrically connected to the light source 4 and the camera 5, and the console 2 can control the operation of the light source 4 and the camera 5.

The detection table 3, the light source 4 and the camera 5 are arranged on the fixing frame 1, the fixing frame 1 is integrally in a straight quadrangular prism shape and is hollow inside, the fixing frame 1 is arranged above the optical shock insulation table 13, the center of gravity is reduced through the optical shock insulation table 13, and the purpose of isolating external shock is achieved. Four corners at the bottom of the optical shock-insulation platform 13 are provided with horseback wheels.

The lens position of the camera 5 is provided with a telecentric coaxial lens 51, and the deformation of the image can be reduced by the camera 5 through the telecentric coaxial lens 51, so that the accuracy of the acquired image is ensured.

The light source 4 is disposed on the light source fixing plate 12. The light source fixing plate 12 and the camera fixing plate 11 are disposed on the fixing frame 1. The light source fixing plate 12 is located below the inspection stage 3.

As shown in fig. 2, a support 34 is disposed on the inspection table 3, the support 34 is located on the object carrying plate 32, and the support 34 is made of a transparent material and is used for fixing the part to be inspected and preventing the part to be inspected from shifting. The bracket 34 is in a shape of a straight quadrangular prism as a whole, and a groove is formed in the middle of the bracket 34. The top of the bracket 34 enables the part to be detected to be horizontally arranged, so that the camera 5 acquires a front image of the part to be detected; the groove portion of the bracket 34 enables the part to be detected to be vertically arranged, so that the camera 5 acquires a side image of the part to be detected. The depth of the groove of the support 34 is determined by the difference value of the width and the thickness of the part to be detected, and through the arrangement of the support and the groove in the support, when the front face of the part to be detected is arranged upwards and the side face of the part to be detected is arranged upwards, the collected images are close in height, and the image amplification rate of the camera is consistent.

Examine test table 3 and set up on mount 1, examine and be provided with perpendicular high accuracy between test table 3 and the mount 1 and adjust slide rail 35, perpendicular high accuracy is adjusted slide rail 35 and is located four angles that examine test table 3. The adjustment of the overall height and inclination angle of the detection table 3 can be realized by adjusting the vertical high-precision adjusting slide rail 35.

A laser ranging device 31 is arranged between the camera fixing plate 11 and the detection table 3, and the distance between the camera 5 and the detection table 3 can be detected through the laser ranging device 31. Laser rangefinder 31 includes laser rangefinder sensor transmission head and laser rangefinder receiver, and wherein the laser rangefinder receiver sets up on four angles that detect platform 3, and the laser rangefinder sensor transmission head sets up on four angles that are used for camera fixed plate 11 lower surface, and wherein the laser sensor transmission head is just setting up laser rangefinder receiver.

A micro-adjusting knob 33 is arranged between the object carrying plate 32 and the detection platform 3, and the height and the inclination angle of the object carrying plate 32 can be adjusted by adjusting the micro-adjusting knob 33.

As shown in fig. 3, the inspection table 3 is further provided with a transparent checkerboard 36, and the transparent checkerboard 36 is disposed adjacent to the object plate 32. An accurate focusing of the camera 5 can be achieved by the transparent checkerboard 36. An identity card reader 37 is also arranged on the detection table 3.

The console 2 is disposed above the camera fixing plate 11, and the console 2 includes a display module 21 capable of displaying a detection result and a detection process.

Alignment between telecentric coaxial lens 51 and objective plate 32 is achieved by adjusting fine adjustment knob 33 during implementation. The vertical high-precision adjusting slide rail 35 is adjusted through the laser ranging device 31, so that the camera fixing plate 11 is parallel to the detection table 3; and acquiring front and side images of the part to be detected after the adjustment is finished, and uploading the images to the operating table 2 so as to finish the detection of the part to be detected.

The above description is only one specific example of the present invention and does not constitute any limitation to the present invention. It will be apparent to those skilled in the art that various modifications and variations in form and detail may be made without departing from the principles and structures of the invention without departing from the spirit and scope of the invention, but such modifications and variations are within the purview of the appended claims.

Claims (9)

1. A dimension measuring instrument based on machine vision is characterized by comprising a fixed frame, an operation table, a detection table, a light source and a camera; the detection table, the light source and the camera are arranged on the fixing frame; a through hole is formed in the middle of the detection table, an object carrying plate is arranged at the through hole, and the object carrying plate is made of transparent materials; the light source is arranged below the detection platform and corresponds to the object carrying plate; the camera is arranged on the camera fixing plate right above the object carrying plate; the light source is arranged on the light source fixing plate below the carrying plate; the operating platform is electrically connected with the light source and the camera; a telecentric coaxial lens is arranged at the lens of the camera.

2. The machine vision based dimension measuring instrument according to claim 1, wherein a fine adjustment knob is provided between the carrier plate and the inspection table.

3. The dimension measuring instrument based on the machine vision is characterized in that a bracket is arranged on the detection table and is positioned on the object carrying plate; the middle part of the bracket is provided with a groove.

4. The dimension measuring instrument based on the machine vision is characterized in that a vertical high-precision adjusting slide rail is arranged between the detection table and the fixed frame; the vertical high-precision adjusting slide rails are positioned at four corners of the detection platform.

5. The dimension measuring instrument based on the machine vision is characterized in that a laser distance measuring device is arranged between the camera fixing plate and the detection table; the laser ranging device comprises a laser ranging sensor transmitting head and a laser ranging receiver; laser rangefinder receiver sets up on four angles that detect the platform, and laser rangefinder sensor transmission head sets up on four angles that are used for camera fixed plate lower surface, and laser sensor transmission head is just to laser rangefinder receiver setting.

6. The dimension measuring instrument based on the machine vision as claimed in the claim 1, wherein the fixing frame is in a shape of a right quadrangular prism overall, and the inside of the fixing frame is hollow.

7. The machine-vision-based dimension measuring instrument as claimed in claim 6, wherein the fixing frame is arranged above the optical vibration isolation table; four corners at the bottom of the optical shock insulation table are provided with Fu horse wheels.

8. The machine vision-based dimension measuring instrument as claimed in claim 1, wherein a transparent checkerboard and an identity card reader are further provided on the detection table.

9. The machine-vision-based dimension measuring instrument as claimed in claim 1, wherein the console is disposed above the camera fixing plate, and the console comprises a display module.

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