A plate straightness automatic detection device and method

Abstract

The present invention discloses an automatic detection device and method for sheet material straightness, comprising a feeding device, a straight gauge, a light emitting module, a light receiving module, a light shield, and an industrial computer. The feeding device is installed on an equipment platform, the straight gauge is installed at the front end of the sheet material to be tested, the gap between the straight gauge and the detection edge of the sheet material to be tested is the straightness gap, the light emitting module is installed above the straightness gap, the light receiving module is installed below the straightness gap, the light receiving module receives the light source emitted by the light emitting module through the straightness gap, and the light receiving module is connected to the acquisition signal input of the industrial computer. The present invention is used for measuring the straightness of sheet material, and generates a gap curve diagram after measurement, accurately reflecting the size of the gap and the adjustment value of the gap adjustment bolt.

Description

Technical Field

[0001] The invention relates to a plate material shearing edge cut straightness technology, in particular to a plate material straightness automatic detection device and method. Background Art

[0002] One of the sheet metal processing technologies is laser welding. The principle of laser welding is to use laser energy to automatically assemble and weld several steels, stainless steels, aluminum alloys, etc. of different materials, thicknesses, and coatings to form an integral plate. In laser welding, the materials are butted rather than overlapped, which will bring about the characteristics of the weld: the weld width does not exceed 0.1mm. If it exceeds 0.1mm, defects will appear in the weld, such as pores and holes, causing the product to be scrapped. Therefore, the straightness of the weld edge of a single sheet is required to be no more than 0.05mm. The existing method for testing the straightness of the weld edge is to manually push the weld edge to the edge of the straight gauge, and the inspector inserts a 0.05mm feeler gauge into the gap between the weld edge and the straight gauge. If the feeler gauge does not enter, it means that the straightness is qualified, and if the feeler gauge enters, it means that the straightness is out of tolerance. This inspection method depends entirely on the inspector's touch, and it is difficult to judge the gap of about 0.05mm. And when the gap exceeds 0.05mm, there is no specific value, and there is no reference for subsequent adjustments. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a device and method for automatically detecting the straightness of a sheet metal, which is used to measure the straightness of the sheet metal and generates a gap curve graph after measurement to accurately reflect the size of the gap and the adjustment value of the gap adjustment bolt.

[0004] The purpose of the present invention is achieved through the following technical solutions.

[0005] A device for automatically detecting straightness of a sheet material, comprising:

[0006] A loading device, the loading device is used to support and move the sheet material to be tested;

[0007] A straight line gauge, which is used as a straightness measurement reference and is in contact with the sheet to be measured during operation;

[0008] A light emitting module, which is used to provide the light source required in the detection process;

[0009] A light receiving module, which is used to receive the light source emitted by the light emitting module and convert the received light into an electrical signal;

[0010] A light shield, which is used to shield external light sources generated by non-light-emitting modules;

[0011] An industrial computer receives the electrical signal generated by the light receiving module, and stores and feeds back the electrical signal;

[0012] The feeding device is installed on the equipment platform, the straightness gauge is installed at the front end of the sheet to be tested, the gap between the straightness gauge and the detection edge of the sheet to be tested is the straightness gap, the light emitting module is installed above the straightness gap, the light receiving module is installed below the straightness gap, the light receiving module receives the light source emitted by the light emitting module through the straightness gap, and the light receiving module is connected to the acquisition signal input of the industrial computer.

[0013] The loading device comprises a suction cup bracket, on which a plurality of suction cups are distributed. The suction cups suck air to grab and move the sheet material so that the detection side of the sheet material to be tested is placed against the straight line gauge.

[0014] The side of the feeding device is provided with a retaining edge.

[0015] The feeding device comprises an adjusting screw and a servo motor, the suction cup bracket is connected to the adjusting screw through a screw seat, and the adjusting screw is connected to the servo motor through a synchronous belt.

[0016] A loading detection sensor is arranged on the equipment platform, and the loading detection sensor detects whether the sheet material reaches the work station.

[0017] The light receiving module is provided with a CMOS or CCD chip, and the CMOS or CCD chip is used to convert the amount of received light into an electrical signal.

[0018] A method for automatically detecting the straightness of a sheet metal comprises the following steps:

[0019] S1: Multiple suction cups are distributed on the loading device, and the positions of the suction cups are adjusted according to the length and width data of the sheet;

[0020] S2: The manipulator grabs the sheet material onto the loading device. After the loading detection sensor detects the sheet material, the suction cup grabs the sheet material by suction, and the detection edge of the sheet material to be tested is placed against the straightness gauge. The gap between the detection edge and the straightness gauge is the straightness gap.

[0021] S3: The light emitting module emits a beam of light, which passes through the straightness gap and shines on the light receiving module;

[0022] S4: The light passing through the straightness gap shines on the CMOS or CCD chip in the light receiving module, and the data is converted into an electrical signal by the position and size of the light spot on the CMOS or CCD chip;

[0023] S5: The industrial computer receives the electrical signals from different light receiving modules, converts the electrical signals into the size of the gap at the point, and generates a numerical value for the calculated gap;

[0024] S6: The numerical values ​​generated by the gap at each point are plotted according to the detection position and the gap size to intuitively reflect the straightness condition of the sheet metal.

[0025] The step S2: the suction cup grabs the sheet by suction, first moves from right to left to the left side of the sheet to position it, and then moves from bottom to top to place the detection edge of the sheet to be tested against the straightness gauge, and the gap between the detection edge and the straightness gauge is the straightness gap.

[0026] In step S5, the light spot emitted by the light-emitting module is B, the amount of light received by the light-receiving module is B1, the distance from the light-emitting module to the light-receiving module is H1, the distance from the light-emitting module to the reference plane of the sheet is H2, the thickness of the sheet is H, the straightness gap value is C, K is a constant, and the value range of K is 0.8~1.2 according to the different oil film thicknesses on the sheet surface, and is calculated by the formula .

[0027] According to the straightness gap value of each reference point of the sheet metal, the position of the reference point is determined by the position of the shearing machine knife gap adjustment bolt. When the straightness gap corresponding to the reference point is too large, the straightness gap value of the reference point is subtracted by 0.05mm, which is the adjustment value of the knife gap adjustment bolt at the reference point. The adjustment value L is divided by the bolt pitch P*360 o , and obtain the adjustment degree of the reference point bolt.

[0028] Compared with the prior art, the present invention has the advantages of generating a gap curve diagram after measurement, accurately reflecting the size of the gap and the adjustment value of the gap adjustment bolt, and feeding back an adjustment plan. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the present invention.

[0030] In the figure: 1, light emitting module 2, light receiving module 3, suction cup 4, suction cup bracket 5, screw seat 6, adjustment screw 7, straight line gauge 8, feeding detection sensor 9, light shield 10, rib 11, synchronous belt 12, servo motor. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1 As shown, a sheet metal straightness automatic detection device comprises:

[0033] The feeding device includes a suction cup support 4, a retaining edge 10, an adjusting screw rod 6, and a servo motor 12, and is used for supporting and moving the sheet material to be tested.

[0034] Straightness gauge 7: used as a straightness measurement reference, in contact with the sheet to be measured during operation.

[0035] Light-emitting module 1: generates light and provides the light required during the detection process.

[0036] Light receiving module 2: used to receive the light source emitted by light emitting module 1 and convert the received light into an electrical signal through a chip.

[0037] Light shield 9: used to shield external light sources not generated by light-emitting module 1.

[0038] Industrial computer: receives the electrical signal generated by the light receiving module 2, stores and calculates the electrical signal, generates the result in the form of a data chart, and generates a feedback report based on the data.

[0039] The feeding device is installed on the plane of the equipment, the straight line gauge 7 is installed at the front end of the object to be tested, the light emitting module 1 is installed vertically above the plate to be tested, the light receiving module 2 is installed vertically below the plate to be tested, the light shield 9 is connected to the equipment body, and the light receiving module 2 is connected to the acquisition signal input of the industrial computer. There are multiple suction cups 3 distributed on the feeding device. The system adjusts the position of the suction cup 3 according to the length and width data of the plate. The manipulator grabs the plate to the feeding device. After the feeding detection sensor 8 detects the plate, the suction cup 3 sucks air to grab and move the plate to be tested. The detection edge of the plate to be tested is against the straight line gauge 7. The gap between the welding edge and the straight line gauge 7 is the straightness gap. Several independent light emitting modules 1 are arranged just above the contact edge of the straight line gauge 7 and the detection edge of the plate to be tested, and corresponding light receiving modules 2 are arranged below. There is an integral light shield 9 outside the light emitting module 1 and the light receiving module 2 to prevent interference from other light sources. The light emitting module 1 emits light vertically downward, and when the light is directed to the contact edge of the straight gauge 7 and the sheet to be tested, only the light at the gap can pass through to the light receiving module 2. The light receiving module 2 calculates the amount of light received, which can be converted into the size of the gap at that point, and generates a numerical value for the calculated gap. The light spot emitted by the light emitting module is B, the amount of light received by the light receiving module 2 is B1, the distance from the light emitting module to the light receiving module 2 is H1, the distance from the light emitting module to the reference plane of the sheet is H2, the thickness of the sheet is H, and the sheet gap to be tested is C.

[0040] The feeding device includes a suction cup bracket 4, a rib 10, an adjustment screw 6, and a servo motor 12. The suction cup bracket 4 includes a suction cup 3 and a screw seat 5. The suction cup bracket 4 is connected to the adjustment screw 6 through the screw seat 5. The adjustment screw 6 is connected to the servo motor 12 through a synchronous belt 11. The rib 10 is located on the leftmost side of the equipment platform, and a feeding detection sensor 8 is provided in the upper left corner of the equipment platform.

[0041] A method for automatically detecting the straightness of a sheet metal comprises the following steps:

[0042] S1: Multiple suction cups 3 are distributed on the loading device. The system adjusts the position of the suction cups 3 according to the length and width data of the sheet.

[0043] S2: The robot grabs the sheet material onto the loading device. After the loading detection sensor 8 detects the sheet material, the suction cup 3 sucks air to grab the sheet material, first moves from right to left to the left side of the sheet material for positioning, and then moves from bottom to top to place the detection edge of the sheet material to be tested against the straightness gauge 7. The gap between the detection edge and the straightness gauge 7 is the straightness gap.

[0044] S3: The light emitting module emits a beam of light, and the light emitted passes through the gap between the detection edge and the straight line gauge 7 and shines on the light receiving module 2.

[0045] S4: The light passing through the slit illuminates the CMOS or CCD chip in the light receiving module 2, and the data is converted into an electrical signal by the position and size of the light spot on the CMOS or CCD chip.

[0046] S5: The industrial computer receives the electrical signals from different light receiving modules 2, converts the electrical signals into the size of the gap at the point, and generates a numerical value for the calculated gap. The light spot emitted by the light emitting module is B, the amount of light received by the light receiving module 2 is B1, the distance from the light emitting module to the light receiving module 2 is H1, the distance from the light emitting module to the reference surface of the sheet is H2, the thickness of the sheet is H, the sheet gap to be measured is C, K is a constant, and the value range of K is 0.8~1.2 according to the different oil film thicknesses on the sheet surface. It is calculated by the formula .

[0047] S6: Generate a chart of the values ​​generated by the gap at each point according to the detection position to intuitively reflect the straightness of the sheet metal. A gap value of ≤0.05mm is qualified, and a gap value of >0.05mm is unqualified.

[0048] S7: According to the gap size of each reference point of the sheet metal, the position of the point of the automatic straightness detection device is determined by the position of the shearing machine knife gap adjustment bolt. The knife gap corresponding to the unqualified point is too large. The gap value of the point is subtracted by 0.05mm, which is the adjustment value of the knife gap adjustment bolt at the point. The adjustment value L is divided by the bolt pitch P*360 o The value obtained is the adjustment degree of the bolt at that point. The adjustment degree is displayed in the chart and can be fed back to the shearing machine as a basis for adjusting the knife gap.

[0049] After each straightness test of the sheet metal, the system will archive the test data. The system will display a red reminder for the data with out-of-tolerance straightness, and give feedback on the basis for adjusting the gap. After adjusting the equipment according to the feedback and testing the straightness of the sheet metal again, if the straightness is out of tolerance, the system will display a red reminder again and give feedback until the straightness test data fully meets the straightness requirements of the weld. At this time, the system will record that the equipment status at this time is the ideal working status, and record the workload until the straightness is out of tolerance after the test. At this time, the system will give feedback again and calculate the time and workload of the ideal working status. After accumulating the data after multiple productions, the system will formulate a working status table according to the characteristics of various production specifications of sheet metal, and calculate the trend of sheet metal straightness changes and the wear trend of the blade. The functions of work log and management ledger are achieved.

Claims

1. A method for automatically detecting the straightness of a sheet metal, characterized in that A sheet metal straightness automatic detection device is used, and the sheet metal straightness automatic detection device comprises: A loading device, the loading device is used to support and move the sheet material to be tested; A straight line gauge, which is used as a straightness measurement reference and is in contact with the sheet to be measured during operation; A light emitting module, which is used to provide the light source required in the detection process; A light receiving module, which is used to receive the light source emitted by the light emitting module and convert the received light into an electrical signal; A light shield, which is used to shield external light sources generated by non-light-emitting modules; An industrial computer receives the electrical signal generated by the light receiving module, and stores and feeds back the electrical signal; The feeding device is installed on the equipment platform, the straight gauge is installed on the front end of the plate to be tested, the gap between the straight gauge and the detection edge of the plate to be tested is the straightness gap, the light emitting module is installed above the straightness gap, the light receiving module is installed below the straightness gap, the light receiving module receives the light emitted by the light emitting module through the straightness gap, and the light receiving module is connected to the acquisition signal input of the industrial computer; The steps include: S1: Multiple suction cups are distributed on the loading device, and the positions of the suction cups are adjusted according to the length and width data of the sheet; S2: The manipulator grabs the sheet material onto the loading device. After the loading detection sensor detects the sheet material, the suction cup grabs the sheet material by suction, and the detection edge of the sheet material to be tested is placed against the straightness gauge. The gap between the detection edge and the straightness gauge is the straightness gap. S3: The light emitting module emits a beam of light, which passes through the straightness gap and shines on the light receiving module; S4: The light passing through the straightness gap is irradiated onto the CMOS or CCD chip in the light receiving module, and the data is converted into an electrical signal by measuring the position and size of the light spot on the CMOS or CCD chip; S5: The industrial computer receives the electrical signals from different light receiving modules, converts the electrical signals into the size of the straightness gap, and generates a numerical value for the calculated gap; S6: Generate a chart based on the values ​​of the gaps at each point according to the detection position and the gap size, which can intuitively reflect the straightness condition of the sheet metal at this location; In step S5, the light amount of the light spot emitted by the light-emitting module is B, the light amount received by the light-receiving module is B1, the distance from the light-emitting module to the light-receiving module is H1, the distance from the light-emitting module to the reference plane of the sheet is H2, the thickness of the sheet is H, the straightness gap value is C, K is a constant, and the value range of K is 0.8~1.2 according to the different oil film thicknesses on the sheet surface, and is calculated by the formula .

2. The automatic detection method for sheet metal straightness according to claim 1 is characterized in that The loading device comprises a suction cup bracket, on which a plurality of suction cups are distributed. The suction cups suck air to grab and move the sheet material so that the detection side of the sheet material to be tested is placed against the straight line gauge.

3. A sheet metal straightness automatic detection method according to claim 1 or 2, characterized in that A rib is provided on the side of the feeding device.

4. The method for automatically detecting the straightness of a sheet metal according to claim 2, characterized in that The feeding device comprises an adjusting screw and a servo motor, the suction cup bracket is connected to the adjusting screw through a screw seat, and the adjusting screw is connected to the servo motor through a synchronous belt.

5. A sheet metal straightness automatic detection method according to claim 1 or 2, characterized in that A loading detection sensor is arranged on the equipment platform, and the loading detection sensor detects whether the sheet material reaches the work station.

6. The automatic detection method for sheet metal straightness according to claim 1 is characterized in that The light receiving module is provided with a CMOS or CCD chip, and the CMOS or CCD chip is used to convert the amount of received light into an electrical signal.

7. The automatic detection method for sheet metal straightness according to claim 1 is characterized in that The step S2: the suction cup grasps the sheet by suction, first moves from right to left to the left side of the sheet for positioning, and then moves from bottom to top to place the detection edge of the sheet to be tested against the straightness gauge, and the gap between the detection edge and the straightness gauge is the straightness gap.

8. The automatic detection method for sheet metal straightness according to claim 1 is characterized in that Adjust the straightness gap value of each reference point according to the sheet material. The position of the reference point is determined by the position of the shearing machine knife gap adjustment bolt. When the straightness gap corresponding to the reference point is too large, subtract 0.05mm from the straightness gap value of the reference point to obtain the adjustment value of the knife gap adjustment bolt at the reference point. Divide the adjustment value L by the bolt pitch P*360° to obtain the adjustment degree of the reference point bolt.

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