Glass plate directional stretching device and stretching method

Abstract

The present invention discloses a glass plate directional stretching device and stretching method, belonging to the field of glass processing and manufacturing technology, which includes a clamping mechanism, a heating mechanism and a traction stretching mechanism arranged in sequence along the vertical direction, the clamping mechanism is used to clamp the glass plate to be processed, and vertically feed the glass plate to be processed into the heating mechanism; the heating mechanism includes a heating cavity with upper and lower openings, and a preheating temperature zone, a melting temperature zone and a heat preservation temperature zone are arranged vertically in the heating cavity in sequence; the traction stretching mechanism is arranged in the heat preservation temperature zone, and is used to traction and stretch the glass plate to be processed; a controller is also provided between the clamping mechanism and the traction stretching mechanism, and the controller is used to sense the moving speed of the clamping mechanism and control the traction stretching mechanism to traction the glass plate to be processed, so that the glass plate to be processed is stretched at a uniform speed. The directional stretching device in the present application can realize the constant stretching of the glass plate in the molten softened state and the stable molding after stretching, and can obtain an ultra-thin glass plate with a constant aspect ratio of metal particles.

Description

Technical Field

[0001] The invention belongs to the technical field of glass processing and manufacturing, and specifically relates to a glass plate directional stretching device and a stretching method. Background Art

[0002] Ultra-thin glass is a special optical glass with special needle-shaped metal particles distributed in the glass in a directional manner, which has optical polarization properties by utilizing the plasma resonance effect inside the glass. This special optical glass has a wide working band, large incident angle, high optical damage threshold, high mechanical strength and excellent high temperature resistance, and has extremely important applications in the field of optical communications.

[0003] For the stretching process, which is a key technical link in the batch preparation of this type of ultra-thin special glass, the softening and stretching of the glass is the key point to ensure that it is stretched evenly, with uniform thickness and stable aspect ratio of metal particles. The softening of the glass involves related melting heating equipment. During the stretching process of the glass, the current heating equipment has a large temperature gradient inside the equipment, and the overall uniformity of the temperature field is very poor. The softening degree of each part of the glass itself is different, which makes it impossible to continuously and constantly stretch the glass, and it is impossible to obtain the target glass with uniform size and thickness and stable aspect ratio of metal particles. Summary of the invention

[0004] In response to one or more of the above defects or improvement needs in the prior art, the present invention provides a glass plate directional stretching device and a stretching method to solve the problem that the existing stretching equipment cannot obtain glass with uniform size and thickness and stable aspect ratio of metal particles.

[0005] To achieve the above object, the present invention provides a method for directional stretching of a glass sheet, which is implemented by a glass sheet directional stretching device, wherein the glass sheet directional stretching device comprises a clamping mechanism, a heating mechanism and a traction stretching mechanism arranged vertically in sequence, wherein the heating mechanism comprises a preheating temperature zone, a melting temperature zone and a heat preservation temperature zone arranged vertically in sequence; the method comprises the following steps:

[0006] S1: preheating the heating mechanism so that the preheating temperature zone is at a first temperature;

[0007] S2: The clamping mechanism clamps the glass plate to be processed and drives the glass plate to be processed to extend into the preheating temperature zone, and the clamping mechanism drives the glass plate to be processed to continuously descend until the glass plate to be processed moves away from one end of the clamping mechanism and enters the melting temperature zone;

[0008] S3: The heating mechanism performs secondary heating so that the melting temperature zone is at a second temperature, and the melting temperature zone continuously heats the glass sheet to be processed, and the second temperature is not less than the glass transition temperature of the glass sheet to be processed;

[0009] S4: The glass plate to be processed melts and falls away from one end of the clamping mechanism and contacts the traction and stretching mechanism. The traction and stretching mechanism pulls the glass plate to be processed and continuously stretches it to obtain a target glass plate.

[0010] As a further improvement of the present invention, the traction and stretching mechanism includes a driving motor and a reducer;

[0011] In step S4, the stretching force F of the traction and stretching mechanism on the glass plate to be processed is calculated according to the torque T of the drive motor, the reduction ratio i of the reducer, the speed N of the drive motor and the stretching rate V2 of the traction and stretching mechanism on the glass plate to be processed.

[0012] As a further improvement of the present invention, the stretching rate V2 of the glass plate to be processed by the traction and stretching mechanism is calculated based on the descending rate V1 of the glass plate to be processed by the clamping mechanism, the width W1 of the glass plate to be processed, the thickness t1 of the glass plate to be processed, the target glass plate width W2, and the target glass plate thickness t2.

[0013] As a further improvement of the present invention, the stretching rate V2 of the glass sheet to be processed by the traction stretching mechanism is calculated as follows:

[0014] V2=V1*W1*t1 / (W2*t2) (Formula 1)

[0015] As a further improvement of the present invention, the stretching force F of the traction stretching mechanism on the glass sheet to be processed is calculated as follows:

[0016] F=W2*t2*π*N*T*i / (30t1*W1*V1) (Formula 2)

[0017] As a further improvement of the present invention, the traction and stretching mechanism is located in the heat preservation temperature zone, and the temperature of the heat preservation temperature zone is A~B.

[0018] The present application also includes a glass sheet directional stretching device, which includes:

[0019] A clamping mechanism, a heating mechanism and a pulling and stretching mechanism are arranged in sequence vertically;

[0020] Wherein, the clamping mechanism is used to clamp the glass plate and vertically feed the glass plate to be processed into the heating mechanism;

[0021] The heating mechanism comprises a heating cavity with upper and lower openings, wherein the openings are used for introducing and leading out the glass sheet to be processed;

[0022] The heating chamber includes a preheating temperature zone, a melting temperature zone and a heat preservation temperature zone which are arranged vertically in sequence;

[0023] The traction and stretching mechanism is arranged in the heat preservation zone and is used for traction and stretching of the glass sheet to be processed;

[0024] A controller is provided between the clamping mechanism and the traction and stretching mechanism. The controller is electrically connected to the clamping mechanism and the traction and stretching mechanism respectively, and is used to sense the moving speed of the clamping mechanism and control the traction speed of the traction and stretching mechanism to pull the glass plate to be processed, so that the glass plate to be processed is stretched at a uniform speed.

[0025] As a further improvement of the present invention, at least one heating unit is provided in each of the preheating temperature zone, the melting temperature zone and the heat-insulating temperature zone, and the heating temperature of each heating unit is individually adjustable.

[0026] As a further improvement of the present invention, a plurality of heat sensing mechanisms are arranged on the circumferential side wall of the heating mechanism, and each of the heat sensing mechanisms is distributed in the preheating temperature zone, the melting temperature zone and the insulation temperature zone.

[0027] As a further improvement of the present invention, the vertical length of the preheating temperature zone is greater than the vertical length of the melting temperature zone.

[0028] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0029] In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

[0030] (1) The glass plate directional stretching method of the present invention is to divide a heating mechanism into a preheating temperature zone, a melting temperature zone and a heat preservation temperature zone, and place the glass plate to be processed in the preheating temperature zone for heating by a clamping mechanism. The glass plate to be processed is heated in a first temperature interval so that the glass plate to be processed can be quickly melted and softened when entering the melting temperature zone, and the softened glass is stretched by the clamping mechanism so that the glass plate to be processed is in a uniform stretching state. The obtained target glass plate has good uniformity, and the uniform stretching of the glass plate to be processed allows the metal particles in the glass plate to be processed to be in a relatively stable stretching state, thereby obtaining an ultra-thin glass plate with a constant aspect ratio of the metal particles.

[0031] (2) The glass plate directional stretching method of the present invention preliminarily preheats the glass plate to be processed in the preheating temperature zone. On the one hand, it can facilitate the rapid melting and softening of the glass plate to be processed after entering the melting temperature zone, which is convenient for the traction and stretching of the traction and stretching mechanism. On the other hand, it can prevent most of the glass plate to be processed from being in a molten and softened state, making the glass plate to be processed too easy to stretch, resulting in the metal particles being unable to be effectively stretched.

[0032] (3) The glass plate directional stretching method of the present invention sets a preheating temperature zone, a melting temperature zone and a heat preservation temperature zone to ensure that the glass plate to be processed has a temperature buffer area before and after the melting and stretching stage, thereby avoiding excessive vertical temperature gradient of the glass plate to be processed, resulting in large thermal stress inside the glass plate to be processed, and causing warping of the glass plate to be processed.

[0033] (4) The glass plate directional stretching method of the present invention strictly calculates and controls the descending rate of the glass plate to be processed and the stretching force of the traction and stretching mechanism on the glass plate to be processed, so that when the glass plate to be processed is in a stable heating and melting range, the traction and stretching mechanism can stretch the glass plate to be processed at a uniform and stable speed, thereby obtaining a target glass plate with uniform shape and size, and the metal particles in the glass plate to be processed are in a constant and uniform stretching state, so as to obtain an ultra-thin glass plate with a stable aspect ratio of the metal particles.

[0034] (5) The glass plate directional stretching device of the present invention strictly senses the moving rate of the clamping mechanism and the pulling rate of the pulling and stretching mechanism through a controller to ensure constant stretching of the glass plate to be processed in a molten and softened state, and uses a thermal sensing mechanism to sense the temperatures of the preheating temperature zone, the melting temperature zone and the insulation temperature zone in the heating mechanism in real time to ensure constant softening and stretching of the glass plate to be processed and the forming after stretching, thereby ensuring stable forming of the target glass plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 2 is a schematic diagram of the overall structure of a glass plate directional stretching device according to an embodiment of the present invention;

[0036] Figure 2 is a schematic structural diagram of a preheating temperature zone in an embodiment of the present invention;

[0037] Figure 3 2 is a schematic diagram of the structure of the melting temperature zone in an embodiment of the present invention;

[0038] Figure 4 It is a structural schematic diagram of a heating unit in an embodiment of the present invention;

[0039] Figure 5 It is a structural schematic diagram of a heating unit in an embodiment of the present invention.

[0040] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0041] 1. Clamping mechanism; 2. Glass plate to be processed; 3. Preheating temperature zone; 4. Melting temperature zone; 5. Traction and stretching mechanism; 6. Insulation temperature zone; 7. Bracket; 8. Heating unit; 9. Heating wire; 10. Ceramic fiber. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] In the conventional preparation process of special ultra-thin glass, the uniform melting and stable stretching of prefabricated special glass plates are important links in the production process, which determine important performance parameters such as the extinction ratio and particle aspect ratio of special ultra-thin glass. The furnace body of the traditional open single-temperature zone heating furnace cannot meet the heating and stable stretching requirements of prefabricated special glass plates, which is specifically reflected in the following aspects:

[0048] 1. The open single-temperature zone heating furnace has a large heat exchange with the environment outside the furnace, resulting in a very large temperature gradient in the furnace and poor temperature field uniformity, which causes the prefabricated special glass plate to be severely warped in the thickness direction during the melting and softening process, and it cannot be melted synchronously in the width direction, and even the molten prefabricated special glass cannot extend out of the bottom opening of the heating furnace;

[0049] 2. The large temperature gradient in the temperature field will also cause large thermal stress inside the molten prefabricated special glass plate. When it is impacted by the lower temperature at the bottom of the heating furnace, obvious cracks will appear, or even burst;

[0050] 3. After the melted prefabricated special glass plate leaves the single temperature zone heating furnace, it will quickly cool and harden due to the low ambient temperature outside the furnace, causing it to directly break during the stretching stage and unable to achieve effective directional stretching.

[0051] Based on this, the present application proposes a glass sheet directional stretching device and a stretching method, which are as follows:

[0052] See also Figures 1 to 5 The ultra-thin glass plate directional stretching method of the present invention is mainly implemented by a glass plate directional stretching device.

[0053] Specifically, the glass plate directional stretching device in the present application includes a clamping mechanism 1, a heating mechanism and a pulling and stretching mechanism 5 which are arranged in sequence along the vertical direction; wherein the clamping mechanism 1 is used to clamp the glass plate and vertically feed the glass plate 2 to be processed into the heating mechanism, the heating mechanism includes a heating cavity with upper and lower openings, the openings on the above-mentioned heating cavity are used to introduce and lead out the glass plate 2 to be processed; the heating cavity includes a preheating temperature zone 3, a melting temperature zone 4 and a heat preservation temperature zone 6 which are arranged in sequence along the vertical direction, and the above-mentioned pulling and stretching mechanism 5 is arranged in the heat preservation temperature zone 6, and is used to pull and stretch the glass plate 2 to be processed in a molten and softened state; a controller is also provided between the clamping mechanism 1 and the pulling and stretching mechanism 5, and the controller is electrically connected to the clamping mechanism 1 and the pulling and stretching mechanism 5 respectively, and is mainly used to sense the moving speed of the clamping mechanism 1 and correspondingly control the pulling speed of the pulling and stretching mechanism 5 to pull the glass plate 2 to be processed, so that the glass plate 2 to be processed is stretched at a uniform speed.

[0054] The glass plate directional stretching device in the present application is mainly used to sense the descending rate of the glass plate 2 to be processed by the clamping mechanism 1 in real time, and control the traction rate of the traction stretching mechanism 5 accordingly, so that the glass plate 2 to be processed in a molten and softened state is subjected to a constant stretching force; at the same time, the glass plate 2 to be processed is constantly heated by the heating mechanism, so that the glass plate to be processed is in a constant molten and softened state. Under the condition of controlling the softening state and traction force of the glass plate 2 to be processed, the stretching of the glass plate 2 to be processed is in a dynamic equilibrium state, ensuring the constant stretching of the glass plate 2 to be processed and ensuring the stable stretching of the aspect ratio of the metal particles in the glass plate 2 to be processed.

[0055] Preferably, a tensile force sensor is provided on the clamping device in the present application, and the tensile force sensor is used to sense the tensile force data of the glass plate 2 to be processed in a molten softening state. When the tensile force sensing data is stable, it proves that the glass plate 2 to be processed is in a constant tensile state. When the tensile force sensing data fluctuates, it proves that the tensile force of the glass plate 2 to be processed fluctuates or the molten softening rate of the glass to be processed is unstable. Preferably, both ends of the above-mentioned traction clamping mechanism 1 extend horizontally out of the heat preservation zone 6, and a bracket 7 is provided under the traction clamping mechanism 1 to support it. That is, a through hole is correspondingly provided on the side wall of the heating mechanism, and both ends of the traction clamping mechanism 1 pass through the heating mechanism from the through hole and are supported by the bracket 7. It is worth noting that the through hole on the side wall of the heating mechanism needs to be sealed accordingly to prevent the internal heat of the heating mechanism from escaping to the outside through the through hole.

[0056] Furthermore, at least one heating unit 8 is provided in each of the preheating temperature zone 3, the melting temperature zone 4 and the heat preservation temperature zone 6 in the present application, and the temperature of each heating unit 8 is individually adjustable. The heating mechanism in the present application includes a heating cavity, and the preheating temperature zone 3, the melting temperature zone 4 and the heat preservation temperature zone 6 are detachably embedded in the heating cavity, and each temperature zone is substantially composed of each heating unit 8, and each temperature zone is composed of different numbers of heating units 8 to form different temperature areas. In addition, the temperature and number of the heating units 8 in each temperature zone are adjustable to adapt to the glass sheets 2 to be processed with different heating requirements.

[0057] Furthermore, the heating units 8 in each temperature zone are all wound in a certain manner using a certain length of high-temperature resistant heating wire 9, which can be arranged in a circumferential winding form or a vertical winding form, and then embedded in the ceramic fiber 10 by negative pressure molding. In addition, the length of the heating wire 9 can be calculated according to the power required for heating, and the spacing between the heating wires 9 can also be selected according to the diameter of the heating wire 9 and the negative pressure molding process parameters. Preferably, inlay notches are reserved at the upper and lower ports of the ceramic fiber 10 body of each heating unit 8 to facilitate the assembly and embedding of the heating units 8 in each temperature zone.

[0058] Furthermore, a heat insulating layer is respectively arranged between the preheating temperature zone 3, the melting temperature zone 4 and the heat preservation temperature zone 6 in the above-mentioned heating mechanism, and a through hole is also provided on the heat insulating layer for the glass plate 2 to be processed to pass through. The heat insulating layer can reduce the temperature in the melting temperature zone 4 to a certain extent from being dissipated to the preheating temperature zone 3 and the heat preservation temperature zone 6. Since through holes need to be provided on the preheating temperature zone 3 and the heat preservation temperature zone 6 for the glass plate 2 to be processed and the target glass plate to pass through, the heat dissipation at the upper and lower ends of the heating mechanism is relatively serious, and therefore a heat insulating layer needs to be provided between the temperature zones to reduce the heat dissipated from the heating mechanism to the upper and lower ends.

[0059] The purpose of setting the preheating temperature zone 3, the melting temperature zone 4 and the heat preservation temperature zone 6 in the heating mechanism is to preliminarily heat the glass plate 2 to be processed through the preheating temperature zone 3, so that the glass plate 2 to be processed will not melt between the glass transition temperatures, and by controlling the temperature of the preheating temperature zone 3, the glass plate 2 to be processed can be quickly raised to the melting temperature range in the melting temperature zone 4, so as to facilitate the pulling and stretching mechanism 5 to stretch the glass plate 2 to be processed. At the same time, the glass plate 2 to be processed directly enters the melting temperature zone 4 from room temperature, which will cause a large change in its temperature gradient, resulting in a large thermal stress inside the glass plate 2 to be processed, causing the glass plate 2 to be processed to warp. Moreover, when the glass plate 2 to be processed is in the melting temperature zone 4 for a large portion, the glass plate 2 to be processed is severely melted and softened, and it falls seriously under gravity and is easily stretched, resulting in the metal particles inside it being unable to be effectively stretched and the aspect ratio of the metal particles being unable to be guaranteed. Therefore, it is necessary to pre-set a preheating temperature zone 3 so that the glass plate 2 to be processed can be quickly melted and softened after entering the melting temperature zone 4 while avoiding premature melting of the glass plate 2 to be processed.

[0060] Furthermore, in order to avoid the problem that most of the glass plate 2 to be processed is in the melting temperature zone 4, which causes it to melt and soften prematurely, the vertical arrangement length h1 of the preheating temperature zone 3 is preferably greater than the vertical arrangement length h2 of the melting temperature zone 4, so that most of the glass to be processed is in a preheating state and can soften quickly after entering the melting temperature zone 4.

[0061] At the same time, the preheating temperature zone 3, the melting temperature zone 4 and the insulation temperature zone 6 in the heating mechanism realize heat exchange inside the heating mechanism through heat convection and heat radiation, and realize the temperature field coupling inside the entire heating mechanism, so as to ensure that the temperature in the heating mechanism forms a gradient temperature range within a certain range, which facilitates the uniform melting and flow of metal particles in the glass plate 2 to be processed along the direction of gravity, and ensures that the metal particles extend along the direction of the tensile force under the action of the downward tensile force, so as to achieve the purpose of stretching the aspect ratio of the metal particles.

[0062] Furthermore, the setting of the above-mentioned insulation temperature zone 6 is to avoid the problem that the glass sheet 2 to be processed coming out of the melting temperature zone 4 is rapidly cooled and hardened, resulting in direct breakage during stretching by the traction stretching mechanism 5. In addition, the temperature of the above-mentioned insulation temperature zone 6 needs to be strictly set and has a certain temperature difference with the temperature of the melting temperature. The temperature difference design between the insulation temperature zone 6 and the melting temperature zone 4 is to avoid the rebound phenomenon of the metal particles at the melting temperature after stretching, and the rebound of the metal particles is reduced by a certain temperature difference design.

[0063] Further preferably, a plurality of heat sensing mechanisms are arranged on the circumferential side wall of the heating cavity in the present application, and each heat sensing mechanism is distributed in the preheating temperature zone 3, the melting temperature zone 4 and the insulation temperature zone 6, so as to monitor the temperature of each temperature zone, so as to adjust the temperature of each temperature zone at any time to make it in a dynamic equilibrium state. Specifically, the above-mentioned heat sensing mechanism is a thermocouple, and a plurality of through holes for inserting thermocouples are provided on the circumferential side wall of the heating cavity. Preferably, the number of thermocouples inserted can be arranged according to the actual test accuracy, and the through holes where the thermocouples are not inserted are filled with insulation materials to block them to avoid heat dissipation.

[0064] Furthermore, the glass sheet directional stretching method in the present application is implemented by the above-mentioned glass sheet directional stretching device, which comprises the following steps:

[0065] S1: preheating the heating mechanism so that the preheating temperature zone 3 is at a first temperature;

[0066] S2: the clamping mechanism 1 clamps the glass plate 2 to be processed and drives the glass plate 2 to be processed to extend into the preheating temperature zone 3, and the clamping mechanism 1 drives the glass plate 2 to be processed to continuously descend until the glass plate 2 to be processed moves away from one end of the clamping mechanism 1 and enters the melting temperature zone 4;

[0067] S3: The heating mechanism performs secondary heating so that the melting temperature zone 4 is at a second temperature, and the melting temperature zone 4 continues to heat the glass plate 2 to be processed, and the second temperature is not less than the glass transition temperature of the glass plate 2 to be processed;

[0068] S4: The end of the glass plate 2 to be processed that is away from the clamping mechanism 1 melts and falls and contacts the traction and stretching mechanism 5. The traction and stretching mechanism 5 pulls the glass plate 2 to be processed and continuously stretches it to obtain a target glass plate.

[0069] Specifically, in the above step S1, the temperature of the heating mechanism is increased by heating the heating mechanism as a whole, and the first temperature of the preheating temperature zone 3 is preferably 450±10°C, 450°C is lower than the glass transition temperature of the conventional glass plate 2 to be processed, so that the glass plate 2 to be processed will not be deformed, and is close to the glass transition temperature (500-800°C) of the glass plate 2 to be processed, while avoiding the melting and softening of the glass plate 2 to be processed, so that the glass plate 2 to be processed can quickly reach the melting and softening temperature after entering the melting temperature zone 4, where the glass transition temperature of the glass plate 2 to be processed is determined according to the characteristics of the glass plate itself.

[0070] Furthermore, in the above step S3, the secondary heating of the heating mechanism is achieved through the heating unit 8 inside it, and the second temperature of the melting temperature zone 4 is not less than the glass transition temperature of the glass plate 2 to be processed, and the second temperature is adjusted according to the actual glass transition temperature of the glass plate 2 to be processed. Normally, the second temperature is 5°C to 35°C higher than the glass transition temperature of the glass plate 2 to be processed, so as to ensure that the glass plate 2 to be processed is melted and softened, while avoiding excessive melting degree to affect the stretching of the metal particles.

[0071] Furthermore, the above-mentioned directional stretching method for glass sheets needs to achieve constant stretching of the glass sheet 2 to be processed, which relies on the traction and stretching force of the traction and stretching mechanism 5 and the clamping and feeding rate of the clamping mechanism 1.

[0072] Specifically, the traction and stretching mechanism 5 includes a driving motor and a reducer, and the stretching force F of the traction and stretching mechanism 5 on the glass plate 2 to be processed is calculated according to the torque T of the driving motor, the reduction ratio i of the reducer, the speed N of the driving motor and the stretching rate V2 of the traction and stretching mechanism 5 on the glass plate 2 to be processed, as follows:

[0073] F=T*i*π*N / (30*V2) (Formula 3)

[0074] Furthermore, the stretching rate V2 of the glass plate 2 to be processed by the traction stretching mechanism 5 is calculated according to the descending rate V1 of the glass plate 2 to be processed by the clamping mechanism 1, the width W1 of the glass plate 2 to be processed, the thickness t1 of the glass plate 2 to be processed, the target glass plate width W2, and the target glass plate thickness t2, as follows:

[0075] V2=V1*W1*t1 / (W2*t2) (Formula 1)

[0076] By substituting V2 in Formula 1 into Formula 3, the calculation method of the tensile force F of the traction and stretching mechanism 5 on the glass plate 2 to be processed can be obtained, which is specifically as follows:

[0077] F=W2*t2*π*N*T*i / (30t1*W1*V1) (Formula 2)

[0078] In the process of preparing the target glass plate, the width W2 and thickness t2 of the target glass plate are known, the width W1 and thickness t1 of the glass plate 2 to be processed are known, the torque T of the driving motor, the reduction ratio i of the reducer, the speed N of the driving motor, and the descending rate V1 of the glass plate 2 to be processed by the clamping mechanism 1 can all be obtained by setting, and the tensile force F of the traction and stretching mechanism 5 on the glass plate 2 to be processed can be obtained. When the tensile force of the traction and stretching mechanism 5 on the glass plate 2 to be processed is determined and the temperature of the heating mechanism is constant, the stable stretching of the size of the target glass plate can be ensured. In addition, the target glass plate with a thickness between 0.1 and 1 mm can be obtained by the above-mentioned stretching method.

[0079] Furthermore, the traction and stretching mechanism 5 is located in a heat preservation zone 6 to ensure that the target glass plate is cooled and formed. To avoid the rebound of the elongated metal particles in the target glass plate, the temperature of the heat preservation zone 6 is preferably between 200 and 300°C.

[0080] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for directional stretching of a glass sheet, used for directional stretching of a glass sheet containing metal particles inside, characterized in that: The method is realized by a glass plate directional stretching device, which comprises a clamping mechanism, a heating mechanism and a traction stretching mechanism arranged vertically in sequence, the heating mechanism comprises a heating cavity, a preheating temperature zone, a melting temperature zone and a heat preservation temperature zone arranged vertically in sequence in the heating cavity, a heat insulation layer is arranged between the preheating temperature zone, the melting temperature zone and the heat preservation temperature zone respectively, a through hole for the glass plate to be processed to pass through is provided on the heat insulation layer, the preheating temperature zone, the melting temperature zone and the heat preservation temperature zone in the heating mechanism are coupled with the internal temperature field of the heating mechanism by means of heat convection and heat radiation, and the traction stretching mechanism is located in the heat preservation temperature zone; It includes the following steps: S1: preheating the heating mechanism so that the preheating temperature zone is at a first temperature; S2: The clamping mechanism clamps the glass plate to be processed and drives the glass plate to be processed to extend into the preheating temperature zone, and the clamping mechanism drives the glass plate to be processed to continuously descend until the glass plate to be processed moves away from one end of the clamping mechanism and enters the melting temperature zone; S3: The heating mechanism performs secondary heating so that the melting temperature zone is at a second temperature, and the melting temperature zone continuously heats the glass sheet to be processed, and the second temperature is not less than the glass transition temperature of the glass sheet to be processed; S4: The glass plate to be processed melts and falls away from one end of the clamping mechanism and contacts the traction and stretching mechanism. The traction and stretching mechanism pulls the glass plate to be processed and continuously stretches it to obtain a target glass plate with a stable aspect ratio of metal particles.

2. The method for directional stretching of a glass sheet according to claim 1, characterized in that: The traction and stretching mechanism includes a driving motor and a reducer; In step S4, the stretching force F of the traction and stretching mechanism on the glass plate to be processed is calculated according to the torque T of the drive motor, the reduction ratio i of the reducer, the speed N of the drive motor and the stretching rate V2 of the traction and stretching mechanism on the glass plate to be processed.

3. The method for directional stretching of a glass sheet according to claim 2, characterized in that: The stretching rate V2 of the glass plate to be processed by the traction and stretching mechanism is calculated according to the descending rate V1 of the glass plate to be processed by the clamping mechanism, the width W1 of the glass plate to be processed, the thickness t1 of the glass plate to be processed, the target glass plate width W2, and the target glass plate thickness t2.

4. The method for directional stretching of a glass sheet according to claim 3, characterized in that: The calculation method of the pulling and stretching mechanism for the stretching rate V2 of the glass sheet to be processed is: V2=V1*W1*t1 / (W2*t2) (Formula 1).

5. The method for directional stretching of a glass sheet according to claim 3, characterized in that: The calculation method of the tensile force F of the traction and stretching mechanism on the glass plate to be processed is: F=W2*t2*π*N*T*i / (30t1*W1*V1) (Formula 2).

6. The method for directional stretching of a glass sheet according to claim 1, characterized in that: The temperature of the insulation zone is 200°C to 300°C.

7. A glass plate directional stretching device, characterized in that: include: A clamping mechanism, a heating mechanism and a pulling and stretching mechanism are arranged in sequence vertically; Wherein, the clamping mechanism is used to clamp the glass plate to be processed and vertically feed the glass plate to be processed into the heating mechanism; The heating mechanism comprises a heating cavity with upper and lower openings, wherein the openings are used for introducing and leading out the glass sheet to be processed; The heating cavity includes a preheating temperature zone, a melting temperature zone and a heat preservation temperature zone arranged vertically in sequence, and heat insulation layers are respectively arranged between the preheating temperature zone, the melting temperature zone and the heat preservation temperature zone, and the heat insulation layers are provided with through holes for the glass plate to be processed to pass through; The traction and stretching mechanism is arranged in the heat preservation zone and is used for traction and stretching of the glass sheet to be processed; A controller is provided between the clamping mechanism and the traction and stretching mechanism. The controller is electrically connected to the clamping mechanism and the traction and stretching mechanism respectively, and is used to sense the moving speed of the clamping mechanism and control the traction speed of the traction and stretching mechanism to pull the glass plate to be processed, so that the glass plate to be processed is stretched at a uniform speed.

8. The glass sheet directional stretching device according to claim 7, characterized in that: At least one heating unit is provided in each of the preheating temperature zone, the melting temperature zone and the heat preservation temperature zone, and the temperature of each heating unit is independently adjustable.

9. The glass sheet directional stretching device according to claim 7, characterized in that: A plurality of heat sensing mechanisms are arranged on the circumferential side wall of the heating mechanism, and each of the heat sensing mechanisms is distributed in the preheating temperature zone, the melting temperature zone and the heat preservation temperature zone.

10. The glass sheet directional stretching device according to claim 7, characterized in that: The vertical length of the preheating temperature zone is greater than the vertical length of the melting temperature zone.

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