Automatic detection platform and detection method for batch-produced parts

Abstract

The invention belongs to the technical field of detection, and discloses an automatic detection platform for batch-produced parts, which comprises an adjustable working table, a rotary measuring table, a computer and a three-dimensional scanner, and is characterized in that the table top of the adjustable working table is connected with a scanner clamping device, and the three-dimensional scanner is fixed on the scanner clamping device through a scanner fixing frame; the adjustable workbench is connected with a code scanning gun, and the code scanning gun and the three-dimensional scanner are connected to a computer through data lines. According to the invention, automatic acquisition of detection tasks, automatic detection, output of detection reports, uploading of detection results to a quality management system and the like can be realized, and the detection efficiency is greatly improved; and an automatic machining unit is matched to realize integration of processing and measurement.

Description

Technical Field

[0001] The invention belongs to the field of detection technology and relates to an automatic detection platform and a detection method for mass-produced parts. Background Art

[0002] Patent CN 109539990A discloses a method for automatic product size measurement, which is mainly used in the field of automobile parts manufacturing. The coordinates of the parts are measured by a line laser sensor carried by the end of the robot and compared with the theoretical coordinate values ​​to obtain the size deviation value of the parts. This method can only detect the measuring points, and before the measurement begins, the robot coordinate system needs to be fitted with the coordinate system of the object being measured, which may cause large errors and low detection efficiency.

[0003] Patent CN 107421468B discloses a color 3D scanning system and method, which are mainly used for cultural relics scanning and 3D digital model reconstruction. By mounting a 3D scanning device on a robotic arm, the circumferential scanning of the object to be measured on the carrier is performed, and the coding pattern is projected onto the object to be measured. The coding pattern on the object is collected by a projection acquisition module and a 3D model is reconstructed to obtain a color 3D model of the scanned object. This method can only obtain a rough 3D model with low accuracy and cannot obtain accurate dimensions.

[0004] Patent CN 111069078B discloses a multifunctional visual inspection platform, which includes a size inspection area and a defect inspection area, and can realize the size and defect monitoring of regular workpieces. Through multiple visual modules, the size and defect inspection can be completed at one time. However, the platform has a small scope of application and can only realize the inspection of small parts with regular shapes. Moreover, the size inspection only uses top camera, the size inspection range is small, and the inspection size types are single. The use of vibration plate loading may cause scratches on the surface of parts, and the use of two robots and multiple sets of inspection vision is costly. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide an automatic detection platform and a detection method for mass-produced parts.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An automatic inspection platform for mass-produced parts, comprising an adjustable workbench, a rotating measuring table, a computer, and a three-dimensional scanner. The tabletop of the adjustable workbench is connected to a scanner clamping device, the three-dimensional scanner is fixed to the scanner clamping device through a scanner fixing frame, the adjustable workbench is connected to a barcode scanner, and the barcode scanner and the three-dimensional scanner are connected to the computer through a data cable;

[0008] The rotary measuring table includes a rotary table, a rotary table support frame, a cross roller bearing, and a servo motor. The rotary table includes a measuring platform and a target plate. The rotary table is fixed above the cross roller bearing, and the cross roller bearing is fixed to the rotary table support frame through a connecting plate. The servo motor is connected to the angle reducer and fixed to the bottom of the rotary table support frame through a connecting frame. The control line of the servo motor is connected to a computer. The point cloud data of the object to be measured can be obtained through the three-dimensional scanning equipment and the rotary table, and the detection report can be automatically obtained on the computer and uploaded to the management system.

[0009] As a preferred embodiment, a plurality of target points are posted on the target plate.

[0010] The present invention also discloses a detection method for an automatic detection platform for mass-produced parts, comprising the following steps:

[0011] S1. Use a barcode scanner to scan the QR code on the object to be measured, and place the object to be measured in the center of the measuring platform;

[0012] S2, start the automatic detection system software platform to obtain measurement task related information;

[0013] S3, the servo motor drives the rotating table to rotate one circle, and the 3D scanner carried by the automatic detection hardware platform obtains point cloud data and stores it in the specified position after processing in the scanning software;

[0014] S4. Call the measurement software in the automatic detection system software platform. The measurement software will automatically load the standard model and measurement macro command of the object to be measured in the measurement task. After executing the macro command, the measurement software will automatically execute the preset program, align the point cloud data with the standard model, and automatically generate a measurement report. The report can display the measured values ​​and deviations of all preset measurement dimensions, and determine whether the detection dimension is within the calibrated error range.

[0015] The scanning software and measurement software are both existing software.

[0016] As a preferred method, the step S4 also includes checking the dimensions to be exported in the detection software and saving them; importing the measurement data in the automatic detection system software platform, and viewing the detection data on the system interface.

[0017] Further preferably, in step S4, the pre-writing of the macro command includes: definition of empty features based on the digital model, creation of operational relationships between features, matching of the standard digital model and the measurement model, extraction of measurement values ​​of each feature, and verification of the detection results.

[0018] Further preferably, the automatic detection system software includes an inspection item management module, a task management module, a quality management module, and a user management module;

[0019] The inspection item management module is used to add new measurement dimensions, edit measurement dimensions, and cancel measurement dimensions;

[0020] The task management module is used to add tasks, execute tasks, start Polyworks, produce point cloud data of physical parts, execute batch measurement macro scripts, produce measurement reports, and import measurement data;

[0021] The quality management module is used to check the measurement data;

[0022] The user management module is used to edit users, user status, and user query.

[0023] The automatic inspection software platform mainly focuses on the management of batch parts measurement dimension data, and provides a closed-loop control solution for the definition of the dimensions to be measured for batch parts and the centralized management and control of measurement data, so that the dimensions to be measured have a range, and the measurement data can be tracked and automatically compared with the actual measured values ​​and standard values, effectively eliminating the problems of missed dimensions and manual mis-recording of measurement data, thereby improving work efficiency.

[0024] The automatic detection software platform is developed based on the C# platform, which can realize functions such as inspection item management, task management, quality management (measurement data management), and user management. SqlSugar is used as the ORM framework; the background interception and parsing technology of barcode scanner information is broken through to realize direct task acquisition. The software is deeply integrated with the PolyWorks software, and the PolyWorks SDK builds an integration bridge between the two systems to realize the search, screening, and calling of PolyWorks function functions and macro script instructions, and realizes the automatic loading of workspaces, standard measurement models, macro scripts and other loading functions, and completes the detection functions such as measurement report parsing and quality data extraction.

[0025] The automatic detection hardware platform equipped with a 3D scanner can cooperate with the scanning software to obtain the point cloud data of the object under test. After importing the point cloud data into the detection software, the macro commands are used to compare the point cloud data with the theoretical model and automatically generate a detection report. The automatic detection system software platform realizes detection task management, measurement software calling and detection data management and upload.

[0026] The present invention designs a rotating table including an inner detection platform and an outer ring target disk. The detection platform is used to place the object to be detected. A number of target points are posted on the target disk, which can improve the model splicing efficiency when the 3D scanner acquires point cloud data, and can avoid posting and tearing off the target points on the object to be detected. The scanning software can automatically remove irrelevant models such as the measurement platform and the target disk, and only retain the point cloud data of the object to be detected, without affecting the scanning results.

[0027] When three scanners are commonly used to obtain point cloud data of the object being measured, a handheld scanner is basically used to scan around the object being measured. Handheld scanners have poor stability and cannot accurately control the scanning speed, resulting in the need for multiple scans or repeated scanning of defective areas. The speed of obtaining point cloud data is slow and cannot be automated.

[0028] The present invention fixes the 3D scanner on the scanner clamping device through the scanner fixing frame, which can be freely moved and positioned in space. With the rotating table controlled by the servo motor, the 3D scanner can obtain the point cloud data of the measured object after one rotation. The whole process is completed automatically and the scanning speed is stable, and the efficiency of point cloud data acquisition is higher.

[0029] The present invention has the following advantages:

[0030] The present invention is mainly used for automatic size detection of machined parts in batch production. It can realize automatic acquisition of detection tasks, automatic detection and output of detection reports, uploading of detection results to the quality management system, etc., greatly improving the detection efficiency; and cooperate with the automated machining unit to realize the integration of processing and measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a three-dimensional diagram of the detection platform of the present invention;

[0032] Figure 2 for Figure 1 A front view of

[0033] Figure 3 for Figure 2 Section view along line AA;

[0034] Figure 4 This is a system architecture diagram of data interaction of the present invention;

[0035] Figure 5 It is an operation flow chart of automatic detection of the present invention.

[0036] In the figure: 1-adjustable workbench, 2-portable computer, 3-barcode scanner, 4-scanner clamping device, 5-scanner fixing frame, 6-3D scanner, 7-measuring platform, 8-target plate, 9-rotating table support frame, 10-roller, 11-rotating table, 12-cross roller bearing, 13-connecting plate, 14-profile frame, 15-connecting frame, 16-corner reducer, 17-servo motor. DETAILED DESCRIPTION

[0037] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] Embodiment 1:

[0040] An automatic inspection platform for mass-produced parts includes an adjustable workbench 1, a rotating measuring table, a portable computer 2, and a three-dimensional scanner 6. The rotating measuring table includes a rotating table 11, a rotating table support frame 9, a cross roller bearing 12, and a servo motor 17.

[0041] The adjustable workbench 1 can be adjusted up and down in height. A portable computer 2 is placed on the workbench desktop. A barcode scanner 3 is configured on the side of the workbench. The scanner clamping device 4 is fixed to the edge of the workbench desktop. The three-dimensional scanner 6 is fixed to the scanner clamping device 4 through the scanner fixing frame 5. The three-dimensional scanner 6 and the barcode scanner 3 are connected to the portable computer 2 through a data cable.

[0042] The rotating measuring table includes a rotating table support frame 9 and a rotating table 11. The rotating table 11 mainly includes a measuring platform 7 and a target plate 8. The measuring platform 7 area is the area where the object to be measured is placed. Several target points are posted on the target plate 8 to improve the model splicing efficiency when the 3D scanner obtains point cloud data, and it can avoid posting target points on the object to be measured. The scanning software can automatically remove irrelevant models such as the measuring platform and the target plate 8, and only retain the point cloud data of the object to be measured.

[0043] The turntable 11 is fixed above the cross roller bearing 12, and the cross roller bearing 12 is fixed to the turntable support frame 9 through the connecting plate 13. The servo motor 17 is connected to the angle reducer 16 and fixed below the turntable support frame 9 through the connecting frame 15. The control line of the servo motor 17 is connected to the portable computer 2.

[0044] An automatic detection system software platform, a scanning software and a detection software are installed on the portable computer 2 . In addition, a three-dimensional scanner 6 , a barcode scanning gun 3 and a servo motor 17 are also connected to the portable computer 2 .

[0045] The specific detection methods are as follows:

[0046] Before carrying out automatic inspection, it is necessary to prepare the automatic inspection hardware platform, the automatic inspection system software platform, the scanning software and the inspection software, the physical object to be tested, the theoretical three-dimensional model of the object to be tested and the list of inspection items of the object to be tested. And enter the inspection tasks and the inspection items of the object to be tested on the automatic inspection system software platform. Write the inspection process macro commands of the object to be tested in the inspection software to realize the automation of the inspection process. The pre-writing of the inspection process macro commands mainly includes 5 steps: ① Definition of empty features based on digital model ② Creation of operation relationship between features ③ Matching of standard digital model and measurement model ④ Extraction of measurement values ​​of each feature ⑤ Verification of inspection results.

[0047] S1: The inspector enters the account and password on the portable computer 2 to log in to the automatic inspection system software platform.

[0048] S2: Use the barcode scanner 3 to scan the QR code on the object to be measured, and place the object to be measured in the center of the measuring platform 7.

[0049] S3: The automatic detection system software platform will automatically obtain the relevant information of the measurement task. After the inspector confirms that everything is correct, click "Start Detection".

[0050] S4: Control the servo motor 17 to drive the rotating table 11 to rotate one circle, and automatically detect the three-dimensional scanner 6 carried by the hardware platform to obtain point cloud data and store it in a specified position after processing in the scanning software.

[0051] S5: Call the measurement software in the automatic detection system software platform, and the measurement software will automatically load the standard model and measurement macro command of the object to be measured in the measurement task. After executing the macro command with one click, the measurement software will automatically execute the pre-set program, align the point cloud data with the standard model, and automatically generate a measurement report. The report can display the measured values ​​and deviations of all preset measurement dimensions, and determine whether the detection dimension is within the calibrated error range.

[0052] S6: In the inspection software, select the dimensions to be exported and save them in the default location.

[0053] S7: Import the measurement data in the automatic detection system software platform with one click, click the Save button to complete the data import. At this time, you can view the detection data on the system interface.

[0054] Embodiment 2:

[0055] This embodiment measures a specific batch of parts, and the number of measured dimensions of a single part is about 40, including length dimension, spatial point distance dimension (difficult to detect with measuring instruments), plane angle dimension, spatial angle dimension (difficult to detect with measuring instruments), fillet dimension, circular hole diameter, shape position tolerance (coaxiality, verticality). After completing the calibration of all measured dimensions and related preparations, the formal inspection begins.

[0056] Step 1: The inspector uses a barcode scanner to scan the QR code on the object to be measured and places the object to be measured in the center of the measuring platform. The automatic detection system software platform will automatically obtain the relevant information of the measurement task. After the inspector confirms that it is correct, he clicks "Start Detection". The total time for step 1 is about t1 = 15s;

[0057] Step 2: The portable computer controls the servo motor to drive the measuring platform to rotate for one circle, and the 3D scanner on the automatic detection hardware platform obtains point cloud data and stores it in the specified position after processing in the scanning software. The total time of step 2 is about t2 = 110s;

[0058] Step 3: Call the measurement software in the automatic detection system software platform. The measurement software will automatically load the standard model and measurement macro command of the object to be measured in the measurement task. After executing the macro command with one click, the measurement software will automatically execute the pre-set program, align the point cloud data with the standard model, and automatically generate a measurement report. The total time for step 3 is about t3 = 30s;

[0059] Step 4: The report can display the measured values ​​and deviations of all preset measurement dimensions, and determine whether the detected dimensions are within the calibrated error range. The inspector imports the measurement data in the automatic inspection system software platform with one click, clicks the Save button, and completes the data import. Step 4 takes about t4 = 25s;

[0060] In summary, after all the hardware and software preparations before testing are completed, the time for formally measuring a single part is about 3 minutes, and the automatic acquisition of measurement tasks and automatic storage of actual measured data of parts are realized. Compared with the traditional measurement method, which takes several hours to test and record, the efficiency is greatly improved. In addition, the number of measured dimensions has little effect on the measurement time, which is very suitable for the automated inspection of mass-produced parts.

[0061] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. An automatic inspection platform for mass-produced parts, characterized by: It includes an adjustable workbench, a rotating measuring table, a computer, and a three-dimensional scanner. The table top of the adjustable workbench is connected to a scanner clamping device, the three-dimensional scanner is fixed to the scanner clamping device through a scanner fixing frame, the adjustable workbench is connected to a barcode scanner, and the barcode scanner and the three-dimensional scanner are connected to the computer through a data cable; The rotary measuring table includes a rotary table, a rotary table support frame, a cross roller bearing, and a servo motor. The rotary table includes a measuring platform and a target plate. The rotary table is fixed above the cross roller bearing. The cross roller bearing is fixed to the rotary table support frame through a connecting plate. The servo motor is connected to an angle reducer and then fixed below the rotary table support frame through a connecting frame. The control line of the servo motor is connected to a computer.

2. The automatic inspection platform for mass-produced parts according to claim 1, characterized in that: A plurality of target points are posted on the target plate.

3. A detection method for an automatic detection platform for mass-produced parts according to claim 1 or 2, characterized in that: The steps include: S1. Use a barcode scanner to scan the QR code on the object to be measured, and place the object to be measured in the center of the measuring platform; S2, start the automatic detection system software platform to obtain measurement task related information; S3, the servo motor drives the rotating table to rotate one circle, and the 3D scanner carried by the automatic detection hardware platform obtains point cloud data and stores it in the specified position after processing in the scanning software; S4. Call the measurement software in the automatic detection system software platform. The measurement software will automatically load the standard model and measurement macro command of the object to be measured in the measurement task. After executing the macro command, the measurement software will automatically execute the preset program, align the point cloud data with the standard model, and automatically generate a measurement report. The report can display the measured values ​​and deviations of all preset measurement dimensions, and determine whether the detection dimension is within the calibrated error range.

4. The detection method of the automatic detection platform for mass-produced parts according to claim 3 is characterized in that: The step S4 also includes selecting the dimensions to be exported in the detection software and saving them; importing the measurement data into the automatic detection system software platform, and viewing the detection data on the system interface.

5. A detection method for an automatic detection platform for mass-produced parts according to claim 3 or 4, characterized in that: In step S4, the pre-writing of the macro command includes: defining empty features based on the digital model, creating operation relationships between features, matching the standard digital model and the measurement model, extracting the measurement values ​​of each feature, and verifying the detection results.

6. A detection method for an automatic detection platform for mass-produced parts according to claim 3 or 4, characterized in that: The automatic detection system software includes an inspection item management module, a task management module, a quality management module, and a user management module; The inspection item management module is used to add new measurement dimensions, edit measurement dimensions, and cancel measurement dimensions; The task management module is used to add tasks, execute tasks, start Polyworks, produce point cloud data of physical parts, execute batch measurement macro scripts, produce measurement reports, and import measurement data; The quality management module is used for viewing measurement data; The user management module is used to edit users, user status, and user query.

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