Float glass production line cold end quality monitoring intelligent sensing system

Abstract

The invention discloses an intelligent sensing system for monitoring the quality of a cold end of a float glass production line, and relates to the technical field of glass production. The device comprises a top displacement beam and a bottom displacement beam which are respectively provided with an image sensor and a reflective mirror assembly, and synchronous detection of glass thickness and internal stress is realized in cooperation with a monitoring medium generation unit capable of adjusting the beam diameter. The thickness is calculated by using the refraction offset after the light beam passes through the glass, stress fringes are generated through the double-polaroid structure, and stress monitoring is realized in combination with an image sensor. The screw rod and the transmission belt driving device realize synchronous closed-loop control under the feedback of the grating ruler, so that the light path and the sensor reciprocate in the width direction of the glass, and real-time scanning of the whole glass is completed. The diameter of the light beam can be adjusted to consider accurate thickness measurement and stress fringe imaging, and the system has the advantages of high precision, full coverage, real-time performance and high automation degree, and is suitable for intelligent detection of the quality of the cold end of the float glass.

Description

Technical Field

[0001] This invention relates to the field of glass production technology, specifically to an intelligent sensing system for monitoring the quality of the cold end of a float glass production line. Background Technology

[0002] In existing float glass production lines, cold-end quality inspection is typically divided into two categories: one is manual sampling, which involves visually observing surface defects or using manual instruments to measure thickness and stress. This method suffers from low efficiency, reliance on experience, and an inability to achieve real-time, full-area inspection. Furthermore, traditional thickness measurement often employs a fixed beam direct illumination method; if the beam diameter is not adjustable, it cannot simultaneously measure thickness and stress, failing to meet both requirements. These shortcomings make existing inspection methods ill-suited to meet the urgent need for high-efficiency, high-precision, and comprehensive inspection in modern large-scale, continuous float glass production. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides the following technical solution: an intelligent sensing system for monitoring the cold end quality of a float glass production line, comprising a top displacement beam and a bottom displacement beam, wherein the top displacement beam is disposed obliquely above the bottom displacement beam, and a light shield bracket and a reflector fixing plate are slidably fitted on the top displacement beam and the bottom displacement beam along their respective horizontal directions, wherein an image sensor is fixedly installed on the light shield bracket; wherein a first reflector and a second reflector are fixedly installed on the reflector fixing plate; and further comprising a monitoring medium generating unit, which is capable of generating parallel light beams of different diameters, wherein the first reflector is used to reflect the light beam emitted by the monitoring medium generating unit onto the second reflector, and the second reflector reflects the light beam onto the image sensor.

[0004] Preferably, a lead screw is rotatably mounted on the top displacement beam, and two parallel top guide slides are also fixedly mounted on the top displacement beam. The light shield bracket slides with the top displacement beam through the two top guide slides. A light shield is fixedly mounted on the light shield bracket, and the image sensor is fixedly mounted inside the light shield. A first heat sink for dissipating heat from the image sensor is also fixedly mounted on the light shield. A first polarizer is fixedly mounted on the side of the light shield facing the bottom displacement beam by magnetic attraction. The first polarizer blocks the image sensor inside the light shield.

[0005] Preferably, two parallel bottom guide slides are fixedly installed on the bottom displacement beam. The reflector fixing plate slides with the bottom displacement beam through the two bottom guide slides. A drive sliding lever is slidably inserted into the reflector fixing plate along its vertical direction. Two pulleys are symmetrically rotated and installed on the side of the bottom displacement beam away from the reflector fixing plate. The two pulleys are connected by a transmission belt. A drive rotating shaft is rotatably installed at the edge of the transmission belt and is fixedly engaged with the drive sliding lever. The lead screw and pulleys are driven by independent motors (the motor controlling the lead screw also needs to have the function of reverse rotation; it should be noted that the two drive methods of lead screw and transmission belt can be interchanged, or one of the drive methods can be selected; two methods are listed here). Both the top and bottom displacement beams are equipped with grating rulers for detecting the displacement of the corresponding light shield bracket and reflector fixing plate, which provide a reference for the required rotation angle (number of revolutions) of the corresponding motor, realizing closed control and ensuring that the image sensor inside the light shield and the first and second reflective lenses on the reflector fixing plate move synchronously.

[0006] Preferably, the second reflective lens reflects the light beam of the monitoring medium generating unit perpendicular to the surfaces of the first polarizer and the image sensor, wherein the image sensor and the first polarizer are arranged in parallel.

[0007] Preferably, the monitoring medium generating unit includes a support disk with a light-transmitting hole, a light-shielding plate rotatably mounted on the support disk, and a light-shielding plate control motor for driving the light-shielding plate to rotate on the support disk is fixedly mounted on the support disk. The light-shielding plate has multiple light-shielding holes of different diameters at its circumference, and each light-shielding hole can be concentrically aligned with the light-transmitting hole.

[0008] Preferably, a second polarizer bracket is rotatably fitted at the light-passing hole, a second polarizer is fixedly installed inside the second polarizer bracket, the second polarizer bracket is rotatably mounted on the cover plate, the cover plate is fixedly mounted on the support disc, an adjusting motor is fixedly mounted on the cover plate, and an adjusting gear that meshes with the second polarizer bracket is fixedly mounted on the output shaft of the adjusting motor.

[0009] Preferably, a light-shielding tube coaxially arranged with the second polarizer is fixedly installed on the cover plate. A collimating lens is fixedly installed inside the light-shielding tube. An LED is fixed to the end of the light-shielding tube away from the second polarizer, and a second heat sink for heat dissipation is fixed on the LED. The light emitted by the LED is collimated by the collimating lens and then emitted. The emitted light passes through the second polarizer and the light-shielding hole in sequence. By changing the alignment of the light-shielding hole with the light-passing hole of different diameters, the diameter of the final emitted light beam is changed.

[0010] Preferably, the top displacement beam and the bottom displacement beam are fixedly installed between two symmetrically arranged monitoring support plates, and the support disc is fixedly installed on one of the monitoring support plates; the monitoring support plates are fixedly installed on the workshop floor, and a conveyor roller bracket is also fixedly installed on the workshop floor. Multiple conveyor rollers are rotatably installed on the conveyor roller bracket, and all the conveyor rollers are used to support and convey the glass to be monitored.

[0011] Compared with the prior art, the present invention has the following advantages: (1) The present invention generates a parallel beam with a controllable diameter by setting a monitoring medium generating unit, and guides the beam path with two reflectors, and finally projects the beam onto the image sensor. When the beam passes through the glass and is refracted, its projection on the image sensor will be displaced, and the glass thickness can be obtained by calculating the beam offset. This method based on beam refraction displacement does not rely on contact measurement, will not damage the glass, and can continuously detect the thickness of the glass in real time during transmission, ensuring the reliability and real-time performance of the monitoring results; (2) The system of the present invention sets a first and a second polarizer, and uses an adjusting motor to control the rotation of the second polarizer so that its polarization direction is perpendicular to the first polarizer, forming polarized light. When the light passes through the glass, if there is residual stress in the glass, it will cause birefringence, and finally form a stress stripe image on the image sensor. By analyzing the stripe shape and color distribution, the internal stress state of the glass can be obtained intuitively. This method avoids the subjective error of the traditional manual observation method, realizes the synchronous detection of thickness and stress, and improves the monitoring dimension; (3) The present invention has multiple light-shielding holes of different diameters on the support disk, which can adjust the diameter of the beam according to the detection requirements. Small-diameter beams are suitable for high-precision thickness measurement, reducing blurring errors caused by beam spread; large-diameter beams are suitable for stress fringe observation, providing clearer interference effects. This flexible switching mechanism allows the system to maintain high resolution in thickness measurement while providing clear and intuitive stress images in stress detection, achieving the optimal effect of both functions. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0013] Figure 2 This is a schematic diagram of the structure of the reflector fixing plate of the present invention.

[0014] Figure 3 This is a schematic diagram of the structure at the top displacement beam of the present invention.

[0015] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A in the middle.

[0016] Figure 5 This is a diagram showing the installation arrangement of the reflective lens in this invention.

[0017] Figure 6 This is a schematic diagram of the monitoring medium generation unit structure of the present invention.

[0018] In the diagram: 101-Workshop floor plate; 102-Conveyor roller bracket; 103-Conveyor roller; 104-Monitoring support plate; 105-Support disc; 106-Top displacement beam; 107-Bottom displacement beam; 108-Screw rod; 109-First heat sink; 110-Light shield bracket; 111-Light shield; 112-First polarizer; 113-Transmission belt; 114-Bottom guide slide bar; 115-Reflector fixing plate; 116-First reflector lens; 117-Second reflector lens; 118-Drive sliding lever; 119-Drive rotation shaft; 120-Top guide slide bar; 121-Image sensor; 122-Light shield; 123-Light shielding hole; 124-Light transmission hole; 125-Cover plate; 126-Adjusting gear; 127-Second polarizer bracket; 128-Second polarizer; 129-Adjusting motor; 130-Light shielding control motor; 131-Light shielding tube; 132-Collimating lens; 133-Second heat sink; 134-LED bead; 135-Pulley. Detailed Implementation

[0019] The following is in conjunction with the appendix Figures 1-6 The technical solution of the present invention will be further illustrated through specific embodiments.

[0020] This invention provides an intelligent sensing system for monitoring the cold end quality of a float glass production line, comprising a top displacement beam 106 and a bottom displacement beam 107, wherein the top displacement beam 106 is positioned diagonally above the bottom displacement beam 107, and a light shield bracket 110 and a reflector fixing plate 115 are slidably fitted on the top displacement beam 106 and the bottom displacement beam 107 along their respective horizontal directions, wherein an image sensor 121 is fixedly mounted on the light shield bracket 110; wherein a first reflector 116 and a second reflector 117 are fixedly mounted on the reflector fixing plate 115; and further comprising a monitoring medium generating unit capable of generating parallel light beams of different diameters, wherein the first reflector 116 is used to reflect the light beam emitted by the monitoring medium generating unit onto the second reflector 117, and the second reflector 117 reflects the light beam onto the image sensor 121.

[0021] A lead screw 108 is rotatably mounted on the top displacement beam 106. Two parallel top guide slides 120 are also fixedly mounted on the top displacement beam 106. The light shield bracket 110 slides with the top displacement beam 106 through the two top guide slides 120. A light shield 111 is fixedly mounted on the light shield bracket 110. The image sensor 121 is fixedly mounted inside the light shield 111. A first heat sink 109 for dissipating heat from the image sensor 121 is also fixedly mounted on the light shield 111. A first polarizer 112 is fixedly mounted on the side of the light shield 111 facing the bottom displacement beam 107 by magnetic attraction. The first polarizer 112 blocks the image sensor 121 inside the light shield 111. Two parallel bottom guide slide rods 114 are fixedly installed on the bottom displacement beam 107. The reflector fixing plate 115 is slidably engaged with the bottom displacement beam 107 through the two bottom guide slide rods 114. A drive sliding lever 118 is slidably inserted into the reflector fixing plate 115 along its vertical direction. Two pulleys 135 are symmetrically rotated and installed on the side of the bottom displacement beam 107 away from the reflector fixing plate 115. The two pulleys 135 are connected by a transmission belt 113. A drive rotating shaft 119 is rotatably installed at the edge of the transmission belt 113. The drive rotating shaft 119 is fixedly engaged with the drive sliding lever 118. The lead screw 108 and pulley 135 are driven by independent motors (the motor controlling the lead screw 108 also needs to have the function of reverse rotation; it should be noted that the two driving methods of the lead screw 108 and the transmission belt 113 can be interchanged, or one of the driving methods can be selected; two methods are listed here). Both the top displacement beam 106 and the bottom displacement beam 107 are equipped with grating rulers for detecting the displacement of the corresponding light shield bracket 110 and reflector fixing plate 115, providing a reference for the required rotation angle (number of revolutions) to the corresponding motor, achieving closed-loop control, and ensuring synchronous movement of the image sensor 121 inside the light shield 111 and the first reflector 116 and the second reflector 117 on the reflector fixing plate 115. The second reflector 117 reflects the light beam from the monitoring medium generating unit perpendicular to the surface of the first polarizer 112 and the image sensor 121, wherein the image sensor 121 and the first polarizer 112 are arranged in parallel.

[0022] The monitoring medium generating unit includes a support disk 105 with a light-transmitting hole 124. A light-shielding plate 122 is rotatably mounted on the support disk 105. A light-shielding plate control motor 130 is fixedly mounted on the support disk 105 to drive the light-shielding plate 122 to rotate on the support disk 105. The light-shielding plate 122 has multiple light-shielding holes 123 of different diameters on its circumference, and each light-shielding hole 123 can be concentrically aligned with the light-transmitting hole 124. A second polarizer bracket 127 is rotatably fitted at the light-transmitting hole 124. A second polarizer 128 is fixedly mounted inside the second polarizer bracket 127. The second polarizer bracket 127 is rotatably mounted on a cover plate 125, which is fixedly mounted on the support disk 105. An adjusting motor 129 is fixedly mounted on the cover plate 125, and an adjusting gear 126 that meshes with the second polarizer bracket 127 is fixedly mounted on the output shaft of the adjusting motor 129. A light-shielding tube 131, coaxially arranged with the second polarizer 128, is fixedly installed on the cover plate 125. A collimating lens 132 is fixedly installed inside the light-shielding tube 131. An LED bead 134 is fixed to the end of the light-shielding tube 131 away from the second polarizer 128. A second heat sink 133 for dissipating heat from the LED bead 134 is fixed on the LED bead 134. The light emitted by the LED bead 134 is collimated by the collimating lens 132 and then emitted. The emitted light passes through the second polarizer 128 and the light-shielding hole 123 in sequence. By changing the alignment of the light-shielding hole 123 with the light-passing hole 124, the diameter of the final emitted light beam is changed. The top displacement beam 106 and the bottom displacement beam 107 are fixedly installed between two symmetrically arranged monitoring support plates 104, and the support disc 105 is fixedly installed on one of the monitoring support plates 104. The monitoring support plate 104 is fixedly installed on the workshop floor 101, and a conveyor roller bracket 102 is also fixedly installed on the workshop floor 101. Multiple conveyor rollers 103 are rotatably installed on the conveyor roller bracket 102. All the conveyor rollers 103 are used to support and convey the glass to be monitored.

[0023] After being cooled, the glass produced by the float glass process is conveyed onto conveyor rollers 103, causing it to move forward (in the desired direction). This requires passing between the top displacement beam 106 and the bottom displacement beam 107. At this point, the LED bead 134 is activated, emitting light. This light is collimated by the collimating lens 132, forming a circular beam of light (composed of multiple parallel rays). The beam passes through the second polarizer 128 and the light-passing aperture 124, and then through the light-shielding aperture 123. The light-shielding aperture 123 controls the diameter of the beam, specifically through the light-shielding plate. Motor 130 controls the light-shielding plate 122 to rotate on the support disk 105, so that different light-shielding holes 123 are aligned with light-passing holes 124. Light that is not blocked by the light-shielding holes 123 is emitted to form a beam. The beam illuminates the first reflective lens 116, which reflects the beam to the second reflective lens 117. The second reflective lens 117 reflects the beam to the first polarizer 112, and the beam passes through the first polarizer 112 and is projected onto the image sensor 121 (the first polarizer 112 and the image sensor 121 and the beam reflected by the second reflective lens 117 should be arranged perpendicularly). A portion of the light beam that travels from the second reflector 117 to the first polarizer 112 passes through the glass to be monitored. Since the angle at which the second reflector 117 reflects the light beam is fixed, the angle between the light beam and the glass is known (the glass normally transmits light horizontally or at a known angle). The light beam refracts after entering the glass, and the refracted light refracts again after exiting the glass. This causes the light rays on the upper and lower sides of the glass to be misaligned and parallel, and the amount of misalignment is proportional to the thickness of the glass. Without the glass, the light beam reflected by the second reflector 117 passes directly through the first polarizer 112 and illuminates the image sensor 121. When the light passes through the glass, the spot projected onto the image sensor 121 shifts, and the shift is equal to the number of corresponding pixels multiplied by the pixel size. The thickness of the glass can be calculated from this shift. Simultaneously, by aligning different light-shielding holes 123 with light-transmitting holes 124, the diameter of the light beam can be changed, thereby increasing the ambiguity (accuracy) of the monitoring. At this time, monitoring is only performed on one point of the glass. In order to monitor the entire glass, the corresponding light-shielding bracket 110 and reflector fixing plate 115 need to be driven to reciprocate through the transmission belt 113 and lead screw 108. The movement speed and displacement of the light-shielding bracket 110 and the reflector fixing plate 115 are the same. The movement of the light-shielding bracket 110 drives the first polarizer 112 and the image sensor 121 to move together through the light-shielding 111. The reflector fixing plate 115 drives the first reflector 116 and the second reflector 117 to move together, ensuring that the light beam can always illuminate the image sensor 121. At the same time, the second reflector 117 and the image sensor 121 reciprocate along the width direction of the glass. Combined with the movement direction of the glass itself, the thickness of the entire glass position can be monitored in real time.Simultaneously, the control motor 129, with its output shaft driving the adjustment gear 126 to rotate, in turn drives the second polarizer support 127 to rotate, which in turn drives the second polarizer 128 to rotate (each rotation is at a 90-degree angle, perpendicular to the polarization direction of the first polarizer 112). This causes the light passing through the second polarizer 128 to become polarized light. If there is stress inside the glass, the light will undergo birefringence. The birefringent beam will pass through the first polarizer 112 and project onto the image sensor 121, where stress fringes (color or brightness changes) can be observed. This allows for the monitoring of stress inside the glass while simultaneously monitoring its thickness (when monitoring stress, aligning the large-diameter light-blocking hole 123 with the light-passing hole 124 yields a clearer image).

Claims

1. An intelligent sensing system for monitoring the cold end quality of a float glass production line, characterized in that: It includes a top displacement beam (106) and a bottom displacement beam (107), wherein the top displacement beam (106) is located diagonally above the bottom displacement beam (107), and a light shield bracket (110) and a reflector fixing plate (115) are slidably fitted on the top displacement beam (106) and the bottom displacement beam (107) respectively along their respective horizontal directions. An image sensor (121) is fixedly installed on the light shield bracket (110); and a first reflector (116) and a second reflector (117) are fixedly installed on the reflector fixing plate (115). It also includes a monitoring medium generating unit, which can generate parallel beams of different diameters, wherein a first reflective lens (116) is used to reflect the beam emitted by the monitoring medium generating unit onto a second reflective lens (117), and the second reflective lens (117) reflects the beam onto an image sensor (121).

2. The intelligent sensing system for monitoring the cold end quality of a float glass production line according to claim 1, characterized in that: A lead screw (108) is rotatably mounted on the top displacement beam (106). Two parallel top guide slides (120) are also fixedly mounted on the top displacement beam (106). The light shield bracket (110) slides with the top displacement beam (106) through the two top guide slides (120). A light shield (111) is fixedly mounted on the light shield bracket (110). The image sensor (121) is fixedly mounted inside the light shield (111). A first heat sink (109) for dissipating heat from the image sensor (121) is also fixedly mounted on the light shield (111). A first polarizer (112) is fixedly mounted on the side of the light shield (111) facing the bottom displacement beam (107) by magnetic attraction. The first polarizer (112) blocks the image sensor (121) inside the light shield (111).

3. The intelligent sensing system for monitoring the cold end quality of a float glass production line according to claim 2, characterized in that: Two parallel bottom guide slide rods (114) are fixedly installed on the bottom displacement beam (107). The reflector fixing plate (115) slides with the bottom displacement beam (107) through the two bottom guide slide rods (114). A drive sliding lever (118) is slidably inserted into the reflector fixing plate (115) along its vertical direction. Two pulleys (135) are symmetrically rotated and installed on the side of the bottom displacement beam (107) away from the reflector fixing plate (115). The two pulleys (135) are connected by a transmission belt (113). A drive rotating shaft (119) is rotatably installed at the edge of the transmission belt (113). The drive rotating shaft (119) is fixedly engaged with the drive sliding lever (118).

4. The intelligent sensing system for monitoring the cold end quality of a float glass production line according to claim 3, characterized in that: The second reflector (117) reflects the beam of the monitoring medium generating unit perpendicular to the surface of the first polarizer (112) and the image sensor (121), wherein the image sensor (121) and the first polarizer (112) are arranged in parallel.

5. The intelligent sensing system for monitoring the cold end quality of a float glass production line according to claim 4, characterized in that: The monitoring medium generating unit includes a support disk (105), on which a light-transmitting hole (124) is opened. A light-shielding plate (122) is rotatably mounted on the support disk (105). A light-shielding plate control motor (130) for driving the light-shielding plate (122) to rotate on the support disk (105) is fixedly mounted on the support disk (105). The light-shielding plate (122) has multiple light-shielding holes (123) of different diameters at its circumference. Each light-shielding hole (123) can be concentrically aligned with the light-transmitting hole (124).

6. The intelligent sensing system for monitoring the cold end quality of a float glass production line according to claim 5, characterized in that: A second polarizer bracket (127) is rotatably fitted at the light-passing hole (124). A second polarizer (128) is fixedly installed inside the second polarizer bracket (127). The second polarizer bracket (127) is rotatably mounted on the cover plate (125). The cover plate (125) is fixedly mounted on the support disk (105). An adjustment motor (129) is fixedly mounted on the cover plate (125). An adjustment gear (126) that meshes with the second polarizer bracket (127) is fixedly mounted on the output shaft of the adjustment motor (129).

7. The intelligent sensing system for monitoring the cold end quality of a float glass production line according to claim 6, characterized in that: A light-shielding tube (131) coaxially arranged with the second polarizer (128) is fixedly installed on the cover plate (125). A collimating lens (132) is fixedly installed inside the light-shielding tube (131). An LED bead (134) is fixed at the end of the light-shielding tube (131) away from the second polarizer (128). A second heat sink (133) for dissipating heat from the LED bead (134) is fixed on the LED bead (134).

8. The intelligent sensing system for monitoring the cold end quality of a float glass production line according to claim 7, characterized in that: The top displacement beam (106) and the bottom displacement beam (107) are fixedly installed between two symmetrically arranged monitoring support plates (104), and the support disc (105) is fixedly installed on one of the monitoring support plates (104). The monitoring support plate (104) is fixedly installed on the workshop floor plate (101), and a conveyor roller bracket (102) is also fixedly installed on the workshop floor plate (101). Multiple conveyor rollers (103) are rotatably installed on the conveyor roller bracket (102), and all the conveyor rollers (103) are used to support and convey the glass to be monitored.

Images