System and method for automatically measuring the diameter of metal bars

Abstract

The system and method for automatically measuring the diameter of a metal bar disclosed in the present invention include a transmission platform, a feeding platform is provided at the feeding end of the transmission platform, a pressing device is provided above the transmission platform, a laser diameter gauge is provided at the discharging end of the transmission platform, a computer is electrically connected to the laser diameter gauge, the computer is provided with detection acquisition and data processing software, and a supporting centering mechanism is provided at the discharging end of the laser diameter gauge. The present invention forms an automated measurement system by combining a laser diameter gauge with a transmission platform, a pressing device, and a supporting centering mechanism, and can realize automatic collection and analysis of diameter data in combination with detection acquisition and data processing software, and utilizes automated detection and analysis to replace manual detection, thereby solving the problem of low efficiency and large error in manual diameter measurement of metal bars, and the inability to perform statistical analysis between dimensional data due to a small number of measurement data points.

Description

Technical Field

[0001] The invention belongs to the technical field of metal bar diameter measurement, and in particular relates to a system for automatically measuring the diameter of a metal bar. The invention also relates to a method for automatically measuring the diameter of a metal bar. Background Art

[0002] The existing small-size bar diameters are mostly measured manually. Each bar is measured with a ruler at the head, middle and tail. The ovality measurement requires the bar to be rotated 90 degrees and then measured at three points. The manual measurement, reading and recording of each point are low in detection efficiency. In addition, manual measurement is prone to cause large systematic errors and accidental errors. At the same time, there are few measurement data points, and statistical analysis between dimensional data cannot be performed.

[0003] The laser diameter measuring instrument measures the diameter of bars through symmetrical laser reception, and uses a non-contact method to measure the diameters of objects such as cables and optical cables. The maximum measurable size can meet the diameter requirements of small-sized bars. If used to measure the diameters of small-sized bars, it can replace manual labor and improve inspection quality control and detection efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a system for automatically measuring the diameter of a metal bar, which solves the problems of low detection efficiency and data quality in the existing manual measurement method.

[0005] Another object of the present invention is to provide a method for automatically measuring the diameter of a metal bar.

[0006] The first technical solution adopted by the present invention is: a system for automatically measuring the diameter of a metal bar, comprising a transmission platform, a feeding platform is arranged at the feeding end of the transmission platform, a downward pressing device is arranged above the transmission platform, a laser diameter gauge is arranged at the discharging end of the transmission platform, the laser diameter gauge is electrically connected to a computer, the computer has built-in detection acquisition and data processing software, and a supporting centering mechanism is arranged at the discharging end of the laser diameter gauge.

[0007] The first technical solution of the present invention is also characterized in that: The pressing device comprises a lifting seat fixed above the transmission platform, a lifting rod is connected to the top of the lifting seat, and the front and rear ends of the lifting seat facing the transmission platform are rotatably connected to pressing wheels.

[0008] The top of the transmission platform is a transmission belt, and an accommodating groove is provided on the upper surface of the transmission belt along the traveling direction.

[0009] The supporting centering mechanism includes a lifting platform, a linear slide rail is arranged in the top plane of the lifting platform along the direction of travel of the vertical transmission belt, a moving seat is arranged on the linear slide rail, and a plurality of centering wheels are connected to the moving seat for rotation at even intervals along the direction of travel of the transmission belt.

[0010] A groove is provided on the centering wheel corresponding to the accommodating groove along the circumferential direction.

[0011] An adjusting screw rod parallel to the linear guide rail passes through and is threadedly connected to the bottom of the moving seat.

[0012] The second technical solution adopted by the present invention is: a method for automatically measuring the diameter of a metal bar, using a system for automatically measuring the diameter of a metal bar, comprising the following steps: Step 1: Place the metal bar to be measured on the feeding platform, feed one end of the metal bar into the transmission platform and press it down through the pressing device; Step 2: The transmission platform starts to feed the metal bar into the laser diameter gauge, which measures the diameter of the fed metal bar segment and transmits the detection data to the detection acquisition software. The metal bar segment that has completed the diameter measurement enters the support centering mechanism; Step 3: The detection and acquisition software stores each batch of detection data as a txt file, applies the Python batch processing program to compile the data processing software, and outputs a summary excel table for each batch, including the "measured diameter" and "ovality" of each metal bar.

[0013] The second technical solution of the present invention is also characterized in that: In step 2, an optical sensor is added at the beginning of the detection to determine the collection and completion node storage data of each metal bar.

[0014] The beneficial effects of the present invention are as follows: the system and method for automatically measuring the diameter of a metal bar of the present invention, through a laser diameter gauge and a transmission platform, a downward pressure device, and a support centering mechanism, form an automated measurement system, and combined with detection acquisition and data processing software, can realize automatic acquisition and analysis of diameter data, and use automated detection and analysis instead of manual detection, thereby solving the problem of low efficiency and large error in manual diameter measurement of metal bars, and the inability to perform statistical analysis between dimensional data due to a small number of measurement data points. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a system for automatically measuring the diameter of a metal bar according to the present invention; Figure 2 It is a collection software diagram of the system for automatically measuring the diameter of metal bars of the present invention; Figure 3 It is a diagram of laser diameter measurement data analysis software of the system for automatically measuring the diameter of metal bars of the present invention; Figure 4 This is the operation diagram of the software for collecting titanium alloy bars with a specification of Ф11 mm; Figure 5 (a) shows the equipment measurement (X axis) and manual measurement results of Ф11 mm material bars; Figure 5 (b) shows the results of equipment measurement (Y axis) and manual measurement of Ф11 mm material bars; Figure 6 This is the software operation diagram for collecting titanium alloy bars with a specification of Ф22 mm; Figure 7 (a) shows the equipment measurement (X axis) and manual measurement results of Ф22 mm material bars; Figure 7 (b) shows the equipment measurement (Y axis) and manual measurement results of Ф22 mm material bars.

[0016] In the figure, 1. transmission platform, 2. feeding platform, 3. laser diameter gauge, 4. computer, 5. lifting seat, 6. lifting rod, 7. lower pressure wheel, 8. lifting platform, 9. linear slide rail, 10. moving seat, 11. centering wheel, 12. adjusting screw, 13. PLC control cabinet, 14. material transfer channel. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Example 1 The present invention provides a system for automatically measuring the diameter of a metal bar, such as Figure 1 As shown, it includes a transmission platform 1, a feeding platform 2 is arranged at the feeding end of the transmission platform 1, the top of the transmission platform 1 is a transmission belt, and an accommodating groove is opened on the upper surface of the transmission belt along the traveling direction for placing rods to limit their rolling.

[0019] A pressing device is arranged above the transmission platform 1, which can fix the two in the same box. Through holes are provided on the two side walls of the box facing the front and rear ends of the transmission belt. The pressing device includes a lifting seat 5 fixed above the transmission platform 1, and a lifting rod 6 is connected to the top of the lifting seat 5. The body of the lifting rod 6 is fixed to the top of the box. The lifting seat 5 is rotatably connected to the front and rear ends of the transmission platform 1 with a follow-up pressing wheel 7.

[0020] A laser diameter measuring instrument 3 is provided at the discharging end of the transmission platform 1, and the laser diameter measuring instrument 3 is electrically connected to a computer 4, and the computer 4 is provided with detection collection and data processing software.

[0021] The discharge end of the laser diameter gauge 3 is provided with a supporting centering mechanism, which includes a lifting platform 8. A linear slide 9 is provided in the top plane of the lifting platform 8 along the direction of travel of the vertical transmission belt. A moving seat 10 is provided on the linear slide 9. Three centering wheels 11 are connected to the moving seat 10 and rotated evenly at intervals along the direction of travel of the transmission belt. The centering wheels 11 are provided with grooves corresponding to the receiving grooves along the circumferential direction to limit the shaking of the bar material after the diameter measurement is completed. The upper surface of the feeding platform 2, the receiving grooves, the diameter measuring opening of the laser diameter gauge 3, and the grooves together form a material passage 14 located in the horizontal plane and used to pass the metal bar material. An adjusting screw 12 parallel to the linear slide 9 is passed through and threadedly connected to the bottom of the moving seat 10, which is used to align the grooves on the centering wheel 11 with the receiving grooves on the transmission belt through the moving seat 10.

[0022] The discharging end of the support centering mechanism can also be connected to the qualified and unqualified sorting mechanism through a transmission belt. According to the diameter detection result of the metal bar, the metal bar that does not meet the diameter standard will be pushed out, and finally the metal bar that meets the diameter standard will be collected.

[0023] Through the above-mentioned method, the system for automatically measuring the diameter of metal bars of the present invention forms an automatic measuring system through the laser diameter gauge 3, the transmission platform 1, the pressing device, and the supporting centering mechanism. The transmission platform 1, the lifting rod 6, and the laser diameter gauge 3 can be programmed and automatically controlled by the PLC control cabinet 13. Combined with the detection collection and data processing software, the diameter data can be automatically collected and analyzed. Automated detection and analysis are used instead of manual detection, which solves the problem of low efficiency and large error in manual diameter measurement of metal bars, and the inability to perform statistical analysis between dimensional data due to the small number of measurement data points.

[0024] Example 2 The present invention provides a system for automatically measuring the diameter of a metal bar. The system construction and operation method are as follows: 1) Install PLC to complete the detection control platform. Implement PLC to control the operation of the entire system. Through PLC intervention, control the movement of the system and control the forward speed during the movement.

[0025] 2) Install the transmission platform. Use the belt transmission and the upper roller pressing mode to prevent the material from shaking during transmission and ensure the concentricity of the material transmission.

[0026] 3) Install the laser diameter measuring platform. It consists of a laser diameter measuring instrument and a transmission roller. The transmission roller can be adjusted up and down and left and right by a lead screw to ensure that the platform and the laser diameter measuring instrument are aligned and the concentricity of the entire platform is <0.5mm.

[0027] 4) Install and debug the diameter measurement data acquisition software. The diameter gauge data is transmitted to the detection software through the serial port for collection. After data screening, the PLC can be controlled to automatically sort qualified and unqualified.

[0028] 5) Compile the laser diameter measurement data analysis software using Python batch processing program. The software automatically outputs a summary Excel table for each batch, which includes the "measured diameter" and "ovality" of each bar.

[0029] Through the above-mentioned method, the system for automatically measuring the diameter of metal bars of the present invention is programmed and automatically controlled through the detection control platform, the transmission platform, and the laser diameter measurement platform. Combined with the diameter measurement data acquisition software and the laser diameter measurement data analysis software, it can realize automatic collection and analysis of diameter data, and utilize automated detection and analysis to replace manual detection, thereby solving the problem of low efficiency and large error in manual diameter measurement of metal bars, and the inability to perform statistical analysis between dimensional data due to the small number of measurement data points.

[0030] Example 3 The present invention provides a method for automatically measuring the diameter of a metal bar, such as Figure 1 As shown, the following steps are included: Step 1, place the metal bar to be measured on the feeding platform 2, feed one end of the metal bar into the transmission platform 1 so that the bar is placed along the receiving groove, and lower the lifting seat 5 through the lifting rod 6 so that the lower pressing wheel 7 presses the bar; Step 2, the transmission platform 1 is started, and the rod moves along with the transmission belt. The head end is sent to the diameter measuring port of the laser diameter gauge 3. The laser diameter gauge 3 measures the diameter of the metal rod segment sent in and transmits the detection data to the detection and acquisition software of the computer 4. At the beginning of the detection, an optical sensor is added to determine the collection and completion node storage data of each metal rod. The metal rod segment that has completed the diameter measurement immediately enters the groove of the centering wheel 11 to limit the jitter. Since the rod after the detection loses the constraint of the pressing device, it will produce a small jitter or swing towards both sides during the movement. If it is not restricted by the groove, it will affect the detection accuracy of the rod segment under detection. Before the detection, the height of the linear slide 9 and the moving seat 10 are adjusted in advance by the lifting platform 8, so that the groove height of the centering wheel 11 is equivalent to the height of the accommodating groove. Then, the moving seat 10 is adjusted by adjusting the screw 12 to move it back and forth along the linear slide 9, and at the same time, the notch of the groove is aligned with the notch of the accommodating groove. Step 3: The detection and acquisition software stores each batch of detection data as a txt file, applies the Python batch processing program to compile the data processing software, and outputs a summary excel table for each batch, including the "measured diameter" and "ovality" of each metal bar.

[0031] Through the above-mentioned manner, the method for automatically measuring the diameter of a metal bar of the present invention forms an automated measuring system through the laser diameter gauge 3, the transmission platform 1, the lifting rod 6, and the centering wheel 11. The transmission platform 1, the lifting rod 6, and the laser diameter gauge 3 can be programmed and automatically controlled by the PLC control cabinet 13. Combined with the detection acquisition and data processing software, the diameter data can be automatically collected and analyzed. Automated detection and analysis are used instead of manual detection, which solves the problem of low efficiency and large error in manual diameter measurement of metal bars, and the inability to perform statistical analysis between dimensional data due to the small number of measurement data points.

[0032] Example 4 The present invention provides a method for automatically measuring the diameter of a metal bar. The selected laser diameter gauge has a dual-axis optical scanning system and a processing circuit for generating diameter data and statistical data. When the bar passes through the diameter gauge, it is scanned 600 times per second. The generated data is transmitted to the detection software through the serial port for collection. At the beginning of the collection, an optical sensor is added to determine the collection and completion nodes for each bar to store data. After the bar starts to collect and complete the data, it will send a code to the detection software. The software will collect all the diameter data of the diameter gauge. The results of each axis (X, Y axis) being scanned 600 times per second during the diameter measurement will be transmitted and stored to the computer through the RS232 interface. The data results will intuitively display the maximum, minimum and average values ​​of the diameter. The collection software can be found at http: / / www.cnbc.com / en / Figure 2 .

[0033] Based on the acquisition software, each batch of data is automatically stored as a txt file. The Python batch processing program is used to compile the diameter measurement processing system software, and the summary excel table of each batch is output, which includes the "measured diameter" and "ovality" of each bar. The laser diameter measurement data analysis software can be found in Figure 3 .

[0034] Verify that this method of automatically measuring the diameter of a metal bar is effective: 1) Check whether the bar can move forward normally at the set speed.

[0035] 2) Verify whether the diameter gauge can automatically collect and store information.

[0036] 3) Verify whether the diameter deviation and ovality are automatically output by the data analysis software. After checking, the size meets the requirements of manual measurement (deviation ≤ 0.02mm), the diameter tolerance band of Φ11mm~Φ25mm is greater than 0.02mm, and the metal bars with a length greater than 1m can be measured by this method.

[0037] Through the above-mentioned manner, the method for automatically measuring the diameter of a metal bar of the present invention forms an automatic measuring system through a laser diameter gauge and a transmission platform, which is automatically controlled by a PLC control cabinet. Combined with detection acquisition and data processing software, it can realize automatic collection and analysis of diameter data, and utilizes automated detection and analysis to replace manual detection, thereby solving the problem of low efficiency and large error in manual diameter measurement of metal bars, and the inability to perform statistical analysis between dimensional data due to the small number of measurement data points.

[0038] Example 5 Diameter measurement of Ф11mm titanium alloy test bar The material is tested at a speed of 10m / min, material specification: Ф11 mm, and the number of tested materials is 10. The data is stored normally. The operation diagram of the titanium alloy bar collection software for this specification is shown in Figure 4 The equipment measurement and manual measurement results of each bar were statistically analyzed. Figure 5 (a) and Figure 5 (b) show the equipment measurement and manual measurement results (partial) of Ф11 mm material bars.

[0039] The material specification was Ф11 mm and the quantity was 10. After comparing different measurement methods (equipment measurement and manual measurement), the overall measurement of the 10 materials was statistically analyzed. The maximum error between equipment and manual measurement was 0.011 mm, and the range was <0.02 mm.

[0040] Example 6 Ф22mm test bar diameter measurement The material is tested at a speed of 10 m / min, material specification: Ф22 mm, and the number of tested materials is 10. The equipment measurement and manual measurement results of each bar are statistically analyzed. The operation diagram of the titanium alloy bar acquisition software for this specification is shown in Figure 6 ,Figure 7(a) and Figure 7(b) are the results of equipment measurement and manual measurement of Ф22 mm material bars.

[0041] The material specification was selected as Ф22 mm, and the quantity was 10 pieces. After comparing different measurement methods (equipment measurement and manual measurement), the overall measurement of the 10 pieces of materials was statistically analyzed. The maximum error between equipment and manual measurement was 0.014 mm, and the range was <0.02 mm.

Claims

1. A system for automatically measuring the diameter of metal bars, characterized in that: The transmission platform (1) comprises a transmission platform (1), a feeding platform (2) is arranged at the feeding end of the transmission platform (1), a pressing device is arranged above the transmission platform (1), a laser diameter measuring instrument (3) is arranged at the discharging end of the transmission platform (1), the laser diameter measuring instrument (3) is electrically connected to a computer (4), the computer (4) is equipped with detection collection and data processing software, and a supporting centering mechanism is arranged at the discharging end of the laser diameter measuring instrument (3).

2. The system for automatically measuring the diameter of a metal bar according to claim 1, characterized in that: The pressing device comprises a lifting seat (5) fixed above the transmission platform (1), a lifting rod (6) being connected to the top of the lifting seat (5), and lower pressing wheels (7) being rotatably connected to the front and rear ends of the lifting seat (5) facing the transmission platform (1).

3. The system for automatically measuring the diameter of a metal bar according to claim 1, characterized in that: The top of the transmission platform (1) is a transmission belt, and an accommodating groove is provided on the upper surface of the transmission belt along the traveling direction.

4. The system for automatically measuring the diameter of a metal bar according to claim 3, characterized in that: The support centering mechanism comprises a lifting platform (8), a linear slide rail (9) is arranged in a top plane of the lifting platform (8) along the direction of travel of a vertical transmission belt, a movable seat (10) is arranged on the linear slide rail (9), and a plurality of centering wheels (11) are connected to the movable seat (10) for rotation at even intervals along the direction of travel of the transmission belt.

5. The system for automatically measuring the diameter of a metal bar according to claim 4, characterized in that: The centering wheel (11) is provided with a groove corresponding to the accommodating groove along the circumferential direction.

6. The system for automatically measuring the diameter of a metal bar according to claim 4, characterized in that: An adjusting screw rod (12) parallel to the linear guide rail (9) passes through and is threadedly connected to the bottom of the movable seat (10).

7. A method for automatically measuring the diameter of a metal bar, characterized in that: The system for automatically measuring the diameter of a metal bar as claimed in claim 1 comprises the following steps: Step 1: Place the metal bar to be measured on the feeding platform (2), feed one end of the metal bar into the transmission platform (1) and press it with a pressing device; Step 2, the transmission platform (1) starts to feed the metal bar into the laser diameter measuring instrument (3), the laser diameter measuring instrument (3) measures the diameter of the fed metal bar segment and transmits the detection data to the detection acquisition software, and the metal bar segment that has completed the diameter measurement enters the support centering mechanism; Step 3: The detection and acquisition software stores each batch of detection data as a txt file, applies the Python batch processing program to compile the data processing software, and outputs a summary excel table for each batch, including the "measured diameter" and "ovality" of each metal bar.

8. The method for automatically measuring the diameter of a metal bar according to claim 7, characterized in that: In step 2, an optical sensor is added at the beginning of the detection to determine the collection and completion node storage data of each metal bar.

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