A glass sheet warp detection device

Abstract

The utility model discloses a glass board warping degree detection device, include: frame, the frame is equipped with the conveying device for transporting glass board, detection device, the detection device includes the support rod of vertical in the conveying device one side, the top of support rod is equipped with the cross bar, a plurality of mutually inclined settings laser sensor are connected on the cross bar, the cross bar is located the just above of conveying device, and laser sensor is towards glass board, is used for detecting the warping degree of glass board surface simultaneously, control device, control device with conveying device and detection device electricity is connected, is used for controlling conveying device and detection device start and stop. The application is through a plurality of laser sensor mutually inclined settings, adopts the mode of multi laser line scanning, and the warping degree feature of glass board surface is completely reflected, can fast, accurately, comprehensively measure the flatness of glass board, improves the measuring efficiency and precision.

Description

Technical Field

[0001] This utility model relates to the field of glass plate testing technology, and in particular to a glass plate warpage testing device. Background Technology

[0002] Glass warpage is an indicator that measures the degree to which the planar shape of glass deviates from an ideal plane, describing the bending or twisting state of the glass surface. The main factors affecting glass warpage include: manufacturing process, glass composition, subsequent processing, and storage and transportation.

[0003] Currently, glass warpage detection devices generally adopt traditional manual contact measurement methods, including manual measurement, conduit measurement, and probe measurement, to ensure that the flatness of the glass cover meets actual needs.

[0004] However, these methods, which involve manual contact for measurement, are prone to scratching the glass surface. In addition, the measurement points are limited, which cannot fully reflect the warpage of the glass. The operation is also cumbersome and the detection efficiency is low. Utility Model Content

[0005] The main purpose of this invention is to propose a glass plate warpage detection device, which aims to solve the problems of cumbersome operation and low detection efficiency of existing manual contact measurement methods.

[0006] To achieve the above objectives, this utility model proposes a glass plate warpage detection device, which includes:

[0007] A frame, the frame being equipped with a conveying device for transporting glass plates;

[0008] The detection device includes a support rod vertically arranged on one side of the conveying device, a crossbar at the top of the support rod, and a plurality of laser sensors arranged at inclinations to each other connected to the crossbar. The crossbar is located directly above the conveying device, and the laser sensors face the glass plate, for simultaneously detecting the warpage of the glass plate surface.

[0009] A control device, electrically connected to the conveying device and the detection device, is used to control the start and stop of the conveying device and the detection device.

[0010] In some embodiments, the number of laser sensors is N, satisfying 2≤N≤4, and the tilt angle formed between the galvanometer plane of the laser sensor and the horizontal plane is α, satisfying 25°≤α≤35°.

[0011] In some embodiments, the detection device further includes:

[0012] A data processing unit, electrically connected to the laser sensor, is used to receive and process the data collected by the laser sensor.

[0013] A power supply unit is electrically connected to the data processing unit and the laser sensor.

[0014] In some embodiments, the conveying device is provided with a pressure sensor, which is disposed opposite to the laser sensor, and the conveying device is configured to convey the glass plate past the pressure sensor.

[0015] In some embodiments, the pressure sensors are spaced apart along the width direction of the conveying device.

[0016] In some embodiments, the distance between two adjacent pressure sensors is L, which satisfies 140mm≤L≤160mm.

[0017] In some embodiments, the conveying device includes a transmission gear and a rotating wheel, the transmission gear being located on at least one side of the rotating wheel, the rotating wheel being rotatable relative to the frame, and a plurality of the rotating wheels being arranged side by side to form a conveying channel.

[0018] In some embodiments, the rotating wheel includes two bearing seats disposed on both sides of the rotating wheel and a roller disposed between the bearing seats, and the transmission gear is coaxially disposed with the roller.

[0019] In some embodiments, the conveying device further includes a drive assembly connected to the transmission gear for driving the transmission gear to rotate. The drive assembly includes a drive motor and a synchronous belt connected to the frame, and the transmission gear is connected to the synchronous belt.

[0020] In some embodiments, an alarm device is also included, which is connected to the conveying device and the control device, and is used to output alarm information.

[0021] The glass plate warpage detection device proposed in this application features a crossbar mounted above the frame, with laser sensors mounted on the crossbar. The laser sensors measure the glass surface non-contactly, avoiding damage to the glass surface and improving the safety and reliability of the detection process. Furthermore, multiple laser sensors are arranged at an angle to each other, employing a multi-laser line scanning method to comprehensively acquire three-dimensional data of the glass plate surface, fully reflecting the warpage characteristics and improving the completeness and accuracy of the detection results. A control device enables automated glass plate transport and detection, improving detection efficiency and meeting the needs of large-scale production. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the overall structure of the glass plate warpage detection device in one embodiment of the present invention;

[0023] Figure 2 This is a front view of a glass plate warpage detection device in one embodiment of the present invention;

[0024] Figure 3 This is a top view of a glass plate warpage detection device in one embodiment of the present invention.

[0025] In the attached diagram: 100-frame; 200-conveyor; 300-detection device; 310-support rod; 320-crossbar; 330-laser sensor; 210-pressure sensor; 220-rotating wheel; 230-transmission gear; 221-bearing seat; 222-roller; 240-drive assembly; 241-drive motor. Detailed Implementation

[0026] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0027] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0028] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0029] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0030] Reference Figure 1 and Figure 2 As shown, this application proposes a glass plate warpage detection device, comprising:

[0031] The frame 100 is equipped with a conveying device 200 for transporting glass plates;

[0032] The detection device 300 includes a support rod 310 vertically disposed on one side of the conveying device 200. A crossbar 320 is provided at the top of the support rod 310. A plurality of laser sensors 330 are connected to the crossbar 320 and are arranged at inclinations to each other. The crossbar 320 is located directly above the conveying device 200 and the laser sensors 330 face the glass plate, for the purpose of simultaneously detecting the warpage of the glass plate surface.

[0033] A control device is electrically connected to the conveying device 200 and the detection device 300, and is used to control the start and stop of the conveying device 200 and the detection device 300.

[0034] In this embodiment, the frame 100 can be a rectangular frame structure used to support and install various functional components. Four adjustable feet are installed at the bottom of the frame 100 to ensure the device remains level under different ground conditions.

[0035] The conveying device 200 is located above the frame 100 and is used to carry and transport the glass plate to be tested. The conveying device 200 can be a roller conveyor line, which includes multiple conveying rollers arranged parallel to each other along the transport direction. Each conveying roller has a driven wheel on the side near the frame 100, which is connected to the drive wheel of a servo motor located at the bottom of the frame 100. The driven wheel rotates under the drive of the driven wheel to achieve smooth movement of the glass plate.

[0036] The detection device 300 is disposed on one side of the conveying device 200 and includes a support rod 310, a crossbar 320, and several laser sensors 330. The support rod 310 is vertically mounted on the side of the frame 100, and the crossbar 320 is fixedly connected to its top. The crossbar 320 spans across the conveying device 200 and is vertically connected to the support rod 310 to form a portal structure for stably mounting multiple laser sensors 330.

[0037] Preferably, the crossbar 320 is made of aluminum alloy profile and has a cable routing groove inside to accommodate the signal line of the laser sensor 330, so as to avoid the cable exposure affecting the detection accuracy and device stability.

[0038] Multiple laser sensors 330 are arranged sequentially at intervals along the length of the crossbar 320. Each laser sensor 330 has a certain tilt angle relative to the crossbar 320, such as 5° to 15°, and faces the glass plate surface below the conveying device 200. It is used to emit laser beams and receive reflected light signals to detect the height difference of the glass plate surface at different positions, and then calculate its warpage.

[0039] In this embodiment, the laser sensor 330 is preferably a laser triangulation sensor, which has the characteristics of high precision and high response speed, and the measurement accuracy can reach ±0.01mm.

[0040] The control device is located in an electrical control cabinet on one side of the frame 100 and is electrically connected to the conveyor 200 and the detection device 300. The control device internally includes modules such as an industrial control computer (IPC), a motion control unit, and a data acquisition unit. The control device is used to control the start and stop of the conveyor 200, adjust its speed, and synchronously control the laser sensor 330 in the detection device 300 to collect data at a preset frequency, transmitting the collected height data to the industrial control computer in real time for processing.

[0041] When the glass plate is conveyed by the conveyor 200 to a position directly below the laser sensor 330, the laser sensor 330 begins to synchronously collect height data from multiple points on the surface of the glass plate. The control device uses a built-in algorithm to perform surface fitting on the height data and calculates the maximum warpage value and distribution morphology of the glass plate, ultimately determining whether the glass plate is qualified.

[0042] The glass plate warpage detection device described in this embodiment has the advantages of simple structure, high measurement accuracy, and high degree of automation. It is suitable for online detection of large batches of glass plates, effectively improving detection efficiency and yield.

[0043] Reference Figure 1 and Figure 2 As shown, in some embodiments, the number of laser sensors 330 is N, satisfying 2≤N≤4, and the tilt angle formed between the galvanometer plane of the laser sensor 330 and the horizontal plane is α, satisfying 25°≤α≤35°.

[0044] In this embodiment, the setting angle and number of laser sensors 330 are further optimized to improve the stability and applicability of glass plate warpage detection. N laser sensors 330 are installed on the crossbar 320. Specifically, the parameters of the laser sensors 330 are a wavelength of 650nm and a power of <5mW. N is a positive integer; preferably, in this embodiment, N=3. The three laser sensors 330 are evenly distributed along the length of the crossbar 320, respectively positioned above the left, middle, and right areas of the glass plate, ensuring comprehensive coverage of the main area of ​​the entire glass plate and effective detection of its full-width warpage. Each laser sensor 330 is a laser displacement sensor with a built-in galvanometer module. Its emission direction is tilted at an angle α relative to the horizontal plane. The tilt angle α ranges from 25° to 35°; in this embodiment, α=30°. The main purpose of tilting the laser sensors 330 is to enhance the sensitivity of the measurement to changes in height and reduce the risk of laser signal loss due to mirror reflection. The tilt angle is determined by the structural parameters of the sensor mounting bracket. The mounting bracket is adjustable in tilt and has a limiting structure, facilitating rapid switching under different operating conditions. For example, a 330-unit set of the German SICK CLV630 line laser sensor can be selected.

[0045] In some embodiments, the detection device 300 further includes:

[0046] A data processing unit is electrically connected to the laser sensor 330 and is used to receive and process the data collected by the laser sensor 330.

[0047] The power supply unit is electrically connected to the data processing unit and the laser sensor 330.

[0048] In this embodiment, a data processing unit and a power supply unit are added to achieve efficient reception, analysis, and stable power supply of data from the laser sensor 330, thereby improving the overall intelligence and stability of the system. The data processing unit is an embedded processing module independent of the control device. It establishes a wired communication connection with the laser sensor 330 via an industrial standard interface (such as RS485, EtherCAT, or CAN bus) to receive, preprocess, and buffer the raw height data collected by the laser sensor 330 in real time. The embedded program in the data processing unit can execute preset algorithms to compensate for the data, including ambient temperature compensation algorithms, motion fuzz correction algorithms, and multi-sensor data fusion algorithms. Through the ambient temperature compensation algorithm, the system can adaptively compensate for the impact of temperature changes on the measurement results within a temperature range of -20℃ to 80℃, ensuring the stability of measurement accuracy. The motion fuzz correction algorithm achieves a speed matching error of <0.1%. This algorithm corrects the measurement data based on the glass transmission speed and laser scanning speed, eliminating the influence of motion fuzz and improving the accuracy of the measurement data. A multi-sensor data fusion algorithm is used to fuse data acquired by three line laser displacement sensors. The weighting coefficients are dynamically allocated to improve the accuracy and reliability of the fused data.

[0049] The power supply unit is connected to the laser sensor 330 and the data processing unit through industrial-grade connectors to ensure stable power supply voltage and current for each component, and has overvoltage, undervoltage and short-circuit protection functions to improve the anti-interference capability and service life of the whole machine.

[0050] Reference Figures 1 to 3 As shown, in some embodiments, the conveying device 200 is provided with a pressure sensor 210, which is disposed opposite to the laser sensor 330, and the conveying device 200 is configured to convey the glass plate past the pressure sensor 210.

[0051] In this embodiment, the conveying device 200 is a roller conveyor line, comprising multiple conveying rollers arranged parallel to each other along the transport direction. A pressure sensor 210 and a laser sensor 330 are disposed opposite each other between two adjacent conveying rollers. The pressure sensor 210 is preferably a thin-film pressure sensor or a capacitive pressure-sensitive sensor. The pressure sensor 210 monitors the pressure distribution of the glass during transport in real time. When uneven force or displacement of the glass is detected, the system can adjust the conveying speed and tension in a timely manner to ensure the smoothness of glass transport. Simultaneously, it can collect surface height information and downward pressure values ​​of the glass plate at the same location, facilitating multi-source data fusion analysis.

[0052] Reference Figures 1 to 3 As shown, in some embodiments, pressure sensors 210 are spaced apart along the width direction of the conveying device 200.

[0053] The distance between two adjacent pressure sensors 210 is L, which satisfies 140mm≤L≤160mm.

[0054] In this embodiment, pressure sensors 210 are arranged sequentially along the width of the conveying device 200, with a spacing of 150mm between them. The pressure sensors 210 are connected to the data processing unit via shielded cables. The data processing unit has a built-in pressure threshold judgment program to determine whether the glass plate experiences uniform stress in different areas. If an abnormally high or low pressure phenomenon is detected in a certain area, the system will combine the warp data of that area to analyze whether there is warping, localized stress concentration, or glass defects such as edge chipping.

[0055] Furthermore, to avoid misjudgments caused by glass plate vibration, the pressure sensor 210 supports dynamic pressure sampling with a sampling frequency of 500Hz. The system collects at least 500 sets of pressure data for each glass plate and performs timing alignment by combining the laser height information.

[0056] Reference Figure 1 and Figure 2 As shown, in some embodiments, the conveying device 200 includes a transmission gear 230 and a rotating wheel 220. The transmission gear 230 is located on at least one side of the rotating wheel 220. The rotating wheel 220 can rotate relative to the frame 100. Multiple rotating wheels 220 are arranged side by side to form a conveying channel.

[0057] Furthermore, the rotating wheel 220 includes two bearing seats 221 disposed on both sides of the rotating wheel 220 and a roller 222 disposed between the bearing seats 221, and the transmission gear 230 is coaxially disposed with the roller 222.

[0058] Furthermore, the conveying device 200 also includes a drive assembly 240 connected to the transmission gear 230 for rotating the transmission gear 230. The drive assembly 240 includes a drive motor 241 connected to the frame 100 and a synchronous belt. The transmission gear 230 is connected to the synchronous belt.

[0059] In this embodiment, the conveying device 200 includes several rotating wheels 220 arranged side by side. The rotation axes of the multiple rotating wheels 220 are parallel to each other and arranged laterally. All of them can rotate synchronously relative to the frame 100. The tops of all rotating wheels 220 are coplanar, forming a smooth and continuous support surface, which facilitates the laser sensor 330 to perform interference-free scanning of the glass plate surface. Together, they form a planar conveying channel for conveying the glass plate. The rotating wheels 220 are preferably metal wheels with a surface microstructure anti-slip treatment, which have good load-bearing capacity and friction performance, preventing the glass plate from slipping or shifting during the conveying process.

[0060] Each rotating wheel 220 includes: bearing seats 221 horizontally fixed on both sides of the frame 100, and rollers 222 disposed between the bearing seats 221. The rollers 222 are mounted in the bearing seats 221 via a rotating shaft and can rotate smoothly along their own axis to support and transport the glass plate. A transmission gear 230 is fixedly disposed on one side of the roller 222 and coaxially arranged with it, achieving integrated rotation. Driven by the transmission gear 230, the rollers 222 can rotate efficiently and smoothly, maintaining a continuous and stable conveying surface in contact with the glass plate and avoiding jumping or synchronization deviation.

[0061] The conveying device 200 also includes a drive assembly 240, which includes a drive motor 241 fixedly mounted on one side of the frame 100. It is preferably a servo motor or a stepper motor and has the ability to precisely control the speed and start / stop.

[0062] A circular synchronous belt is arranged around the drive pulley at the output shaft end of the drive motor 241 and each transmission gear 230, forming a synchronous transmission structure. A double-layer polyurethane synchronous belt with a hardness of 65±5 Shore A is used. The double-layer structure design increases the strength and stability of the synchronous belt and reduces tensile deformation and vibration during transmission. An exemplary conveyor belt configuration uses a Japanese Samsung MXL type synchronous toothed belt.

[0063] To ensure stable synchronous belt tension, the conveying device 200 can also be equipped with a tensioning wheel assembly, with the tension adjustable within the range of 0.2-0.5 MPa. By adjusting the synchronous belt tension in real time, it is ensured that the synchronous belt is always in a suitable tension state, avoiding slippage caused by insufficient tension, and also reducing damage to the synchronous belt and transmission components caused by excessive tension.

[0064] The synchronous belt is equipped with an embedded V-shaped guide groove with a depth of 1.2mm and an angle of 60°. The V-shaped guide groove cooperates with the guide protrusions on the conveyor roller to accurately guide the glass conveying direction, prevent the glass from deviating during the conveying process, and improve the stability and accuracy of the conveying.

[0065] A hysteresis coupling is used to drive the synchronous belt. The hysteresis coupling has overload protection; when an overload occurs during transmission, the coupling will slip, preventing damage to the transmission components. Simultaneously, the hysteresis coupling provides a smooth driving force with speed fluctuations ≤0.5%, effectively reducing vibration and impact during transmission.

[0066] Employing a servo speed control system, the response time is <50ms. The servo motor can quickly adjust its speed based on the feedback signal from the pressure sensor 210, achieving precise control of the conveying speed and ensuring that the glass maintains a constant speed during transmission, reducing the impact of speed fluctuations on measurement data.

[0067] The testing procedure of this testing device is as follows:

[0068] The glass plate to be inspected is placed on the conveying device 200, and the glass is precisely positioned by the positioning device to ensure accurate positioning during the transmission process. The glass plate is smoothly transported by the conveying device 200. When the glass is transported to below the laser sensors 330, the three line laser sensors 330 simultaneously perform three-dimensional scanning of the glass surface to acquire three-dimensional data of the glass surface. The data acquired by the three line laser sensors 330 are subjected to multi-sensor data fusion processing to eliminate noise and errors in the data and improve the accuracy and reliability of the data. Using the fused data, the curvature distribution of the glass surface is calculated through a preset algorithm, thereby obtaining the warp value of the glass. Based on the calculated warp value, the glass is graded for quality, and the detection results are output to the display device or control system for subsequent processing and control.

[0069] In some embodiments, an alarm device is also included, which is connected to the conveying device 200 and the control device, and is used to output alarm information.

[0070] In this embodiment, the alarm device also has fault diagnosis and alarm functions. When a problem occurs in a certain link (such as a fault in the laser sensor 330, a deviation in the position of the glass plate, etc.), the alarm device will automatically sound an alarm, provide the specific component where the alarm occurred, and prompt the operator to repair it.

[0071] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A glass plate warpage detection device, characterized in that, include: A frame, the frame being equipped with a conveying device for transporting glass plates; The detection device includes a support rod vertically arranged on one side of the conveying device, a crossbar at the top of the support rod, and a plurality of laser sensors arranged at inclinations to each other connected to the crossbar. The crossbar is located directly above the conveying device, and the laser sensors face the glass plate, for simultaneously detecting the warpage of the glass plate surface. A control device, electrically connected to the conveying device and the detection device, is used to control the start and stop of the conveying device and the detection device.

2. The glass plate warpage detection device according to claim 1, characterized in that, The number of laser sensors is N, satisfying 2≤N≤4, and the tilt angle formed between the galvanometer plane of the laser sensor and the horizontal plane is α, satisfying 25°≤α≤35°.

3. The glass plate warpage detection device according to claim 2, characterized in that, The detection device further includes: A data processing unit, electrically connected to the laser sensor, is used to receive and process the data collected by the laser sensor. A power supply unit is electrically connected to the data processing unit and the laser sensor.

4. The glass plate warpage detection device according to claim 3, characterized in that, The conveying device is equipped with a pressure sensor, which is positioned opposite to the laser sensor. The conveying device is configured to convey the glass plate past the pressure sensor.

5. The glass plate warpage detection device according to claim 4, characterized in that, The pressure sensors are spaced apart along the width of the conveying device.

6. The glass plate warpage detection device according to claim 4, characterized in that, The distance between two adjacent pressure sensors is L, which satisfies 140mm≤L≤160mm.

7. The glass plate warpage detection device according to any one of claims 1 to 6, characterized in that, The conveying device includes a transmission gear and a rotating wheel. The transmission gear is located on at least one side of the rotating wheel. The rotating wheel can rotate relative to the frame. Multiple rotating wheels are arranged side by side to form a conveying channel.

8. The glass plate warpage detection device according to claim 7, characterized in that, The rotating wheel includes two bearing seats disposed on both sides of the rotating wheel and a roller disposed between the bearing seats, and the transmission gear is coaxially disposed with the roller.

9. The glass plate warpage detection device according to claim 8, characterized in that, The conveying device further includes a drive assembly connected to the transmission gear for driving the transmission gear to rotate. The drive assembly includes a drive motor and a synchronous belt connected to the frame, and the transmission gear is connected to the synchronous belt.

10. The glass plate warpage detection device according to claim 9, characterized in that, It also includes an alarm device, which is connected to the conveying device and the control device, and is used to output alarm information.

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