A device for measuring the thickness of a laminated glass and its use

Abstract

This invention discloses a laminated glass thickness measuring device, comprising: a reference probe and a sensing probe disposed within a measuring area. The reference probe is positioned above a conveyor roller, and the sensing probe is positioned between two adjacent conveyor rollers, corresponding vertically to the reference probe. Both the reference probe and the sensing probe have eddy current sensors on their backs for detecting their displacement. When the laminated glass enters the measuring area, it pushes the reference probe and the sensing probe upwards or downwards. The laminated glass thickness measuring device proposed in this application obtains the true thickness of the laminated glass by measuring the initial distance and displacement between the reference probe and the sensing probe. This prevents thickness measurement deviations caused by indirect encoder measurement and mechanical transmission errors, achieving precise control of the laminated glass pressing process and avoiding issues such as bubbles, delamination, uneven thickness, and cracking, thus ensuring the quality of the laminated glass pressing.

Description

Technical Field

[0001] This invention relates to laminated glass, and more specifically to a laminated glass thickness measuring device and its application. Background Technology

[0002] Laminated glass is typically made of two or more sheets of glass with one or more layers of organic polymer interlayer sandwiched between them. It is a composite glass product formed by preheating, rolling, and high-temperature, high-pressure processes to bond the glass and interlayer together. During the lamination process, after the glass sheets and interlayer are laminated, they need to enter a pressing station for heating and rolling to expel gas between the glass sheets and the interlayer, promoting full adhesion between the interlayer and the glass, and ensuring the optical performance and structural strength of the finished glass.

[0003] However, when using pressure rollers to press glass, the pressure applied by the rollers directly depends on the height control of the gap between the rollers and the glass surface. If the gap is too high, insufficient pressure will be applied, which may easily lead to residual air bubbles between layers or local delamination; if the gap is too low, excessive pressure will be applied, which may easily cause the glass to crack or the interlayer to be overstretched and deformed, affecting the safety and uniformity of the product.

[0004] Existing methods for controlling the height gap of pressure rollers typically involve mounting an encoder on the drive motor. The encoder measures the motor's rotation angle to indirectly estimate the glass thickness, and the pressure roller's displacement height is adjusted accordingly. However, this method cannot directly obtain the actual thickness of the glass being pressed. It cannot respond in real-time to the thickness tolerances of the incoming glass or the total thickness deviation after lamination, leading to a mismatch between the pressure applied by the pressure roller and the actual requirements. Furthermore, gears and lead screws in the mechanical transmission system are prone to gaps, wear, and elastic deformation after prolonged use, causing errors between the encoder reading and the actual pressure roller height. This results in inaccurate pressure control during pressing, leading to problems such as bubbles, delamination, uneven thickness, and glass breakage, affecting product quality. Therefore, those skilled in the art provide a laminated glass thickness measuring device and its application to solve the problems mentioned in the background. Summary of the Invention

[0005] The purpose of this invention is to provide a laminated glass thickness measuring device and its application. By measuring the initial distance and displacement between the reference probe and the sensing probe, the true thickness of the laminated glass can be obtained. This prevents the thickness measurement deviation caused by indirect measurement by the encoder and mechanical transmission errors, achieves precise control of the laminated glass pressing, avoids bubbles, delamination, uneven thickness and cracking of the glass, and ensures the quality of laminated glass pressing, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A laminated glass thickness measuring device includes a reference probe and a sensing probe disposed within a measuring area. The reference probe is positioned above a conveyor roller, and the sensing probe is positioned between two adjacent conveyor rollers, corresponding vertically to the reference probe. Both the reference probe and the sensing probe have eddy current sensors on their backs for detecting their displacement. When the laminated glass enters the measuring area, it pushes the reference probe and the sensing probe upwards or downwards. The eddy current sensors feed back the displacement of the reference probe and the sensing probe to a PLC controller. The PLC controller calculates the laminated glass thickness based on the initial distance and displacement between the reference probe and the sensing probe. Based on the laminated glass thickness, it checks whether the pressure roller height meets the standard. If the pressure roller height does not meet the standard, the PLC controller controls a driver to adjust the height of the pressure roller located within the pressing area.

[0008] As a further embodiment of the present invention: an upper base is provided above the conveyor roller, a reference sleeve is provided on the inner side wall of the upper base, a reference probe is slidably installed inside the reference sleeve, and a reference reset spring for adjusting the position of the reference probe is provided around the inner side wall of the upper base surrounding the outside of the reference sleeve, so that the reference probe can be tightly attached to the upper end surface of the laminated glass by the reference reset spring.

[0009] As a further embodiment of the present invention: a lower base is provided below the conveyor rollers, one end of the lower base extends into the interior of the conveyor rollers and is located between two conveyor rollers, and an induction sleeve is provided at the end of the lower base located between the two conveyor rollers, the induction probe is slidably installed inside the induction sleeve, and an induction reset spring for adjusting the position of the induction probe is provided around the end face of the lower base surrounding the outside of the induction sleeve, so that the induction probe can be tightly attached to the lower end face of the laminated glass by the induction reset spring.

[0010] As a further embodiment of the present invention: the eddy current sensor is set at the bottom of the reference sleeve and the sensing sleeve, and the reference probe and the sensing probe are each provided with a sensing iron plate at one end of the reference sleeve and the sensing sleeve. The eddy current sensor can monitor the displacement of the reference probe and the sensing probe by the displacement of the sensing iron plate.

[0011] As a further aspect of the present invention, both the reference probe and the sensing probe are laser rangefinders.

[0012] As a further embodiment of the present invention: the reference probe and the sensing probe are both provided with a contact front end at the end near the laminated glass, and the contact front end is one of the following: a guide wheel, a bearing, an inclined slider, a linear slide rail, and a hinged lever.

[0013] As a further aspect of the present invention: the PLC controller is embedded with an analog-to-digital converter and a microprocessor, wherein the analog-to-digital converter is used to convert the analog voltage signal of the eddy current sensor into a digital signal of displacement, and the microprocessor calculates the thickness value of the laminated glass based on the digital signal of displacement.

[0014] Application of a laminated glass thickness measuring device in the field of laminated glass processing.

[0015] As a further aspect of the present invention, the application includes the conveying of laminated glass during the laminated glass processing.

[0016] Compared with the prior art, the advantages of the present invention are as follows:

[0017] By setting reference probes and sensing probes on the conveyor rollers, the initial distance between the reference probes and sensing probes is measured. When the glass passes by, the glass pushes the reference probes and sensing probes to move upward or downward. At the same time, the eddy current sensor monitors the displacement of the reference probes and sensing probes in real time. Based on the displacement of the reference probes and sensing probes and the initial distance, the true thickness of the laminated glass is calculated, realizing accurate measurement of the laminated glass thickness. This prevents the measurement deviation of the laminated glass thickness caused by indirect measurement by the encoder and mechanical transmission errors. It also accurately controls the height and pressure of the pressure rollers, avoiding glass bubbles, delamination, uneven thickness, and cracking, and ensuring the quality of laminated glass pressing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram showing the distribution of a laminated glass thickness measuring device according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the use state of a laminated glass thickness measuring device according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the signal transmission of a sensor according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram illustrating the application process of a laminated glass thickness measuring device according to an embodiment of the present invention.

[0023] In the diagram: 1. Reference probe; 2. Induction probe; 3. Eddy current sensor; 31. Induction iron plate; 4. Upper base; 41. Reference sleeve; 42. Reference return spring; 5. Lower base; 51. Induction sleeve; 52. Induction return spring; 6. Contact front end. Detailed Implementation

[0024] Combination Figures 1-4 As shown in this embodiment, a laminated glass thickness measuring device includes: a reference probe 1 and a sensing probe 2 disposed within the measuring area. The reference probe 1 is disposed above the conveyor roller, and the sensing probe 2 is disposed between two adjacent conveyor rollers and corresponds vertically to the reference probe 1. Since both the reference probe 1 and the sensing probe 2 are infrared laser rangefinders, the initial gap distance between the reference probe 1 and the sensing probe 2 is measured using an infrared laser rangefinder, and the initial gap distance is calibrated as the initial distance, providing a basis for the calculation of laminated glass thickness measurement.

[0025] In this embodiment, an upper base 4 is provided above the conveyor roller, and a reference sleeve 41 is provided on the inner side wall of the upper base 4. The reference probe 1 is slidably installed inside the reference sleeve 41. When the glass passes the reference probe 1, the glass can press the reference probe 1 to slide into the reference sleeve 41 and press the reference return spring 42 to deform. Under the push of the elastic force of the reference return spring 42, the reference probe 1 is pressed tightly against the upper end surface of the laminated glass, which facilitates the detection of the displacement of the reference probe 1 and the amount of displacement.

[0026] In this embodiment, a lower base 5 is provided below the conveyor rollers. One end of the lower base 5 extends into the interior of the conveyor rollers and is located between two conveyor rollers. Furthermore, an induction sleeve 51 is provided at the end of the lower base 5 located between the two conveyor rollers. The induction probe 2 is slidably installed inside the induction sleeve 51. When the glass passes the induction probe 2, the glass can press the induction probe 2 to slide into the induction sleeve 51 and press the induction reset spring 52 to deform. Under the push of the elastic force of the induction reset spring 52, the induction probe 2 is pressed tightly against the lower end surface of the laminated glass, which facilitates the detection of the displacement of the induction probe 2 and the amount of displacement.

[0027] In this embodiment, the eddy current sensor 3 is disposed at the bottom end of the reference sleeve 41 and the sensing sleeve 51. Furthermore, the reference probe 1 and the sensing probe 2 are each provided with a sensing iron plate 31 at one end of the reference sleeve 41 and the sensing sleeve 51. When the glass pushes the reference probe 1 and the sensing probe 2 to move upward or downward, the reference probe 1 and the sensing probe 2 push the sensing iron plate 31 closer to the eddy current sensor 3 in the reference sleeve 41 and the sensing sleeve 51, thereby changing the electromagnetic field of the coil inside the eddy current sensor 3 and generating an analog voltage signal proportional to the displacement. At the same time, the eddy current sensor 3 feeds back the analog voltage signal to the PLC controller, where it is converted into a digital signal by the analog-to-digital converter, thus obtaining the displacement of the reference probe 1 and the sensing probe 2.

[0028] In this embodiment, both the reference probe 1 and the sensing probe 2 are provided with a contact front end 6 at the end near the laminated glass. The contact front end 6 is one of the following: a guide wheel, a bearing, an inclined slider, a linear slide rail, and a hinged lever. It allows the reference probe 1 and the sensing probe 2 to contact the laminated glass through the contact front end 6. When the glass passes by, the glass pushes the reference probe 1 and the sensing probe 2 to move upward or downward through the contact front end 6, preventing the reference probe 1 and the sensing probe 2 from blocking the front of the glass and preventing it from passing through. This ensures that the reference probe 1 and the sensing probe 2 can move upward or downward with the passage of the glass.

[0029] In this embodiment, the PLC controller calculates the sum of the initial distance, the displacement of the reference probe 1, and the displacement of the sensing probe 2 using a microprocessor to obtain the true thickness of the laminated glass. Then, it compares the true thickness of the laminated glass with the preset pressure roller height to confirm whether the pressure roller height meets the standard. If the pressure roller height does not meet the standard, the microprocessor calculates the difference between the true thickness of the laminated glass and the pressure roller height to obtain the adjustment value of the pressure roller height. The PLC controller sends adjustment instructions and parameters to the driver based on the adjustment value of the pressure roller height. The driver drives the pressure roller to move according to the adjustment parameters to achieve precise adjustment of the pressure roller height and meet the rolling requirements of the laminated glass.

[0030] The working principle of this invention is as follows: The laminated glass thickness measuring device proposed in this application sets a reference probe 1 and a sensing probe 2 on the conveyor rollers, measures the initial gap distance between the reference probe 1 and the sensing probe 2, and calibrates the initial gap distance as the initial distance. Then, the laminated glass is conveyed to the pressing area through the conveyor rollers. When the glass passes through the measuring area, the glass pushes the reference probe 1 and the sensing probe 2 to push the sensing iron plate 31 upward or downward in the reference sleeve 41 and the sensing sleeve 51. At the same time, the displacement of the reference probe 1 and the sensing probe 2 is measured by an eddy current sensor 3. The true thickness of the laminated glass is calculated based on the displacement of the reference probe 1 and the sensing probe 2 and the initial distance, so as to achieve accurate measurement of the thickness of the laminated glass, prevent the thickness measurement deviation of the laminated glass caused by indirect measurement by the encoder and mechanical transmission error, accurately control the height and pressure of the pressure roller, avoid the occurrence of bubbles, delamination, uneven thickness and cracking of the glass, and ensure the pressing quality of the laminated glass.

[0031] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for measuring the thickness of laminated glass, characterized in that, include: A reference probe (1) and a sensing probe (2) are set in the measurement area. The reference probe (1) is set above the conveyor roller, and the sensing probe (2) is set between two adjacent conveyor rollers and corresponds vertically to the reference probe (1). Furthermore, an eddy current sensor (3) for detecting the displacement of the reference probe (1) and the sensing probe (2) is set on the back of both the reference probe (1) and the sensing probe (2). When the laminated glass enters the measurement area, the laminated glass pushes the reference probe (1) and the sensing probe (2) to move upward or downward. The eddy current sensor (3) can feed back the displacement of the reference probe (1) and the sensing probe (2) to the PLC controller. The PLC controller calculates the thickness of the laminated glass based on the initial distance and displacement between the reference probe (1) and the sensing probe (2). Based on the thickness of the laminated glass, it confirms whether the height of the pressure roller meets the standard. If the height of the pressure roller does not meet the standard, the PLC controller controls the driver to adjust the height of the pressure roller located in the pressing area.

2. The laminated glass thickness measuring device according to claim 1, characterized in that, An upper base (4) is provided above the conveyor roller. A reference sleeve (41) is provided on the inner side wall of the upper base (4). The reference probe (1) is slidably installed inside the reference sleeve (41). A reference reset spring (42) for adjusting the position of the reference probe (1) is provided around the outside of the reference sleeve (41) on the inner side wall of the upper base (4). The reference probe (1) can be tightly attached to the upper surface of the laminated glass by the reference reset spring (42).

3. The laminated glass thickness measuring device according to claim 2, characterized in that, A lower base (5) is provided below the conveyor rollers. One end of the lower base (5) extends into the interior of the conveyor rollers and is located between two conveyor rollers. A sensing sleeve (51) is provided at the end of the lower base (5) located between the two conveyor rollers. The sensing probe (2) is slidably installed inside the sensing sleeve (51). A sensing reset spring (52) for adjusting the position of the sensing probe (2) is provided around the end face of the lower base (5) around the outside of the sensing sleeve (51). The sensing probe (2) can be pressed tightly against the lower end face of the laminated glass by the sensing reset spring (52).

4. The laminated glass thickness measuring device according to claim 3, characterized in that, The eddy current sensor (3) is disposed at the bottom end of the reference sleeve (41) and the sensing sleeve (51). Furthermore, the reference probe (1) and the sensing probe (2) are each provided with a sensing iron plate (31) at one end of the reference sleeve (41) and the sensing sleeve (51). The eddy current sensor (3) can monitor the displacement of the reference probe (1) and the sensing probe (2) by the displacement of the sensing iron plate (31).

5. The laminated glass thickness measuring device according to claim 1, characterized in that, Both the reference probe (1) and the sensing probe (2) are laser rangefinders.

6. The laminated glass thickness measuring device according to claim 1, characterized in that, The reference probe (1) and the sensing probe (2) are each provided with a contact front end (6) at one end near the laminated glass. The contact front end (6) is one of the following: guide wheel, bearing, inclined slider, linear slide rail and hinged lever.

7. The laminated glass thickness measuring device according to claim 1, characterized in that, The PLC controller is embedded with an analog-to-digital converter and a microprocessor. The analog-to-digital converter is used to convert the analog voltage signal of the eddy current sensor (3) into a digital signal of displacement. The microprocessor calculates the thickness value of the laminated glass based on the digital signal of displacement.

8. An application of a laminated glass thickness measuring device, characterized in that, The application of a laminated glass thickness measuring device according to any one of claims 1-7 in the field of laminated glass processing.

9. The application of the laminated glass thickness measuring device according to claim 8, characterized in that, The applications include the conveying of laminated glass during the processing of laminated glass.

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