Glass thermal bending process and thermal bending device thereof

Abstract

This invention relates to the field of glass hot bending technology, specifically a glass hot bending process and its apparatus. The invention includes an arched base, with a gantry frame fixedly connected to the top of the arched base. A roller feed belt is fixedly connected to one side of the arched base, and roller rows are symmetrically arranged on the top of the arched base. A roller transfer belt is installed inside the arched base. After the glass is embedded in the concave mold and hot-bent, the roller transfer belt directly drives the concave mold carrying the formed glass to move precisely, avoiding shape deviation caused by the separation of the glass and mold in traditional transfer methods. When the concave mold reaches below the arc-shaped nozzle, the hot glass is cooled gradient through uniform air jetting from the arc-shaped nozzle, effectively preventing shape rebound caused by untimely cooling. From post-forming transfer to cooling and fixing, the glass shape remains stable throughout the entire process, completely solving the problem of shape loss during transfer.

Description

Technical Field

[0001] This invention relates to the field of glass hot bending technology, specifically a glass hot bending process and its hot bending apparatus. Background Technology

[0002] With the development of electronic equipment, architectural decoration, transportation and other fields, the demand for irregularly shaped glass sheets is increasing. Glass hot bending process has become one of the core technologies for forming irregularly shaped glass. The core process of glass hot bending is as follows: flat glass blanks are placed in a specific mold, and the temperature is gradually raised to the glass hot bending temperature by heating equipment, so that the glass is in a softened state and conforms to the mold to form the target curved shape. Then, the formed hot glass sheet needs to be transferred from the hot bending station to the cooling station for cooling and fixing.

[0003] However, at hot bending temperatures, the molecular structure of glass is in a relaxed state, and its bending and shear strengths decrease significantly, making it susceptible to plastic deformation under external forces. In existing transfer methods, whether it's robotic arm clamping, conveyor belt transport, or manual assistance, it's difficult to completely avoid external interference: during robotic arm clamping, contact pressure can easily cause localized indentations in the glass; during manual assistance, uneven operating force can easily cause surface misalignment; and during conveyor belt transport, the softened glass body, due to its own gravity, tends to indent downwards along the conveyor belt contact surface, causing deformation of the newly formed curved surface and reducing product yield. Summary of the Invention

[0004] The purpose of this invention is to provide a glass hot bending process and a hot bending apparatus to solve the problems mentioned in the background art.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A preferred glass hot bending device includes an arched base, a gantry frame fixedly connected to the top of the arched base, a roller feed belt fixedly connected to one side of the arched base, roller rows symmetrically arranged on the top of the arched base, a roller transfer belt arranged inside the arched base, an upper convex mold arranged inside the gantry frame, a lower concave mold placed on the top of the roller transfer belt, the roller row arranged between the upper convex mold and the lower concave mold, the output end of the roller feed belt aligned with the roller row, a T-shaped lifting roller frame symmetrically hinged to one end of the lower concave mold, a tension spring hooked at the bottom of the T-shaped lifting roller frame, and the bottom of the tension spring fixedly connected to the lower concave mold.

[0007] One end of the arched base is equipped with a control component and a cooling component. The control component is used to control the mold temperature and position the concave mold, while the cooling component is used to cool the formed glass evenly. The positioning concave mold carrying the glass is transferred directly from below the convex mold to the cooling component by a roller conveyor belt, which can avoid deformation caused by its own gravity during the transfer of high-temperature glass, thus achieving stable hot bending and cooling.

[0008] Preferably, a pair of guide slide rods are symmetrically slidably connected to the top of the arched base, two roller rows are fixedly connected to the two adjacent guide slide rods respectively, a guide rack is fixedly connected to one end of the roller rows, a guide gear that meshes with the guide rack is symmetrically rotatably connected to the top of the arched base, a first bevel gear is fixedly connected to one end of the guide gear, and a drive shaft is rotatably connected to the top of the arched base, a second bevel gear that meshes with the first bevel gear is symmetrically fixedly connected to one end of the drive shaft.

[0009] Preferably, a transmission gear is fixedly connected to the middle section of the transmission shaft, a transmission rack that meshes with the transmission gear is fixedly connected to one end of the upper convex mold, and a downward sliding rod is symmetrically fixedly connected to the top of the upper convex mold. One end of the downward sliding rod passes through the gantry frame and is slidably connected to the gantry frame. A hydraulic rod is fixedly connected to the top of the gantry frame, and the output end of the hydraulic rod passes through the gantry frame and is fixedly connected to the upper convex mold.

[0010] Preferably, one end of the drive shaft is symmetrically fixedly connected to a lifting gear, one end of the arched base is symmetrically slidably connected to a lifting slide rod, the top of the two lifting slide rods is fixedly connected to a U-shaped support frame, the top of the U-shaped support frame is symmetrically fixedly connected to a lifting rack that meshes with the lifting gear, the bottom of the concave mold is symmetrically provided with positioning slots, one end of the U-shaped support frame passes through the roller conveyor belt and is embedded in the interior of the positioning slot.

[0011] Preferably, the end of the roller array away from the roller feed belt is rotatably connected to an abutment wheel, and three lifting grooves are evenly opened at one end of the roller array. A lifting frame is inserted into the three lifting grooves, and one end of the lifting frame passes through the lifting groove and is rotatably connected to a lifting wheel. The rotation direction of the lifting wheel is perpendicular to the rotation direction of the roller array. Lifting slide rods are symmetrically fixedly connected to the bottom of the lifting frame. One end of the lifting slide rod passes through the roller array and is slidably connected to the roller array. An electric push rod is fixedly connected to the bottom of the roller array. The output end of the electric push rod passes through the roller array and is fixedly connected to the lifting frame.

[0012] Preferably, the top of the rollers is symmetrically provided with alignment grooves, the inside of which is slidably connected to an alignment slider. The top of the alignment slider is inclinedly provided with a sliding guide groove. The top of the lifting frame is symmetrically rotatably connected with a sliding push rod. One end of the sliding push rod passes through the sliding guide groove and rolls against the sliding guide groove.

[0013] Preferably, the cooling assembly includes a liquid nitrogen storage tank fixedly connected to the top of the arched base, an air distribution pipe fixedly connected to the output end of the liquid nitrogen storage tank, three arc-shaped nozzles evenly connected to the output end of the air distribution pipe, the arc-shaped nozzles being installed between the arched base and the roller conveyor belt, and a control valve being provided at the input end of the air distribution pipe.

[0014] Preferably, the control component includes a controller fixedly connected to the top of the arched base, and heating grooves are provided inside both the upper convex mold and the lower concave mold. A temperature sensor and an arc-shaped electric heater are fixedly connected inside the heating groove, and the controller is electrically connected to the temperature sensor and the arc-shaped electric heater.

[0015] Preferably, the control assembly further includes a laser receiving unit fixedly connected to the inner side of the arched base, a laser emitting unit fixedly connected to one side of the recessed mold, and a controller electrically connected to the laser receiving unit and the laser emitting unit.

[0016] A preferred glass hot bending process includes the following steps:

[0017] S1. Glass pretreatment and loading / positioning

[0018] First, wipe the glass surface with a dust-free cleaning tool to remove oil, dust and other impurities to avoid bubbles or scratches after bending. Then, heat the pre-treated glass to the hot bending temperature suitable for its material and place it on a roller feeder.

[0019] Then start the roller feeder to transport the glass to the top of the rollers on the arched base until one end of the glass makes smooth contact with the contact wheel of the rollers. After confirming that the glass is not shifting forward or backward, stop the roller feeder.

[0020] Next, the electric push rod at the bottom of the rollers is activated, which pushes the lifting frame to move the lifting wheel towards the bottom of the glass until the lifting wheel is completely in contact with the bottom of the glass and forms a stable support. During the movement of the lifting frame, the sliding push rod is simultaneously driven to slide along the sliding guide groove, pushing the alignment slider to extend from the alignment groove and clamping and calibrating both sides of the glass until the center line of the glass is aligned with the preset center line of the concave mold, thus completing the loading and positioning.

[0021] S2. Positioning and preheating of the concave mold

[0022] First, start the roller conveyor belt to transport the concave mold to the area directly below the roller row. At the same time, start the laser emitting unit and laser receiving unit of the control component to monitor the position of the concave mold through laser alignment. If a misalignment is found between the concave mold and the glass, the operation of the roller conveyor belt is finely adjusted by the controller until the center line of the concave mold coincides with the center line of the glass, and then the roller conveyor belt is stopped.

[0023] Then, the arc-shaped electric heater is activated to preheat the concave mold and the convex mold inside the gantry. During the preheating process, the mold temperature is monitored in real time by a temperature sensor to ensure that the mold temperature matches the glass hot bending temperature and avoid excessive temperature difference that could cause the glass to break during bending. After the mold temperature stabilizes, the arc-shaped electric heater is turned off, and the glass enters the bending state.

[0024] S3, Glass bending forming

[0025] First, start the hydraulic rod at the top of the gantry frame to push the upper convex mold down along the lower sliding rod at a steady speed to avoid glass impact and breakage due to excessive speed. During the downward movement of the upper convex mold, the transmission rack at one end meshes with the transmission gear of the transmission shaft, driving the transmission shaft and the second bevel gears at both ends to rotate.

[0026] The second bevel gear meshes with the first bevel gear, driving the guide gear to move the guide rack, pulling the two rollers to move smoothly away from both sides until the rollers are completely detached from under the glass, thus avoiding friction and scratches with the glass.

[0027] At the same time, the lifting gear at one end of the drive shaft meshes with the lifting rack, driving the U-shaped lifting frame to move upward, so that the U-shaped lifting frame is embedded in the positioning slot of the concave mold, lifting the concave mold upward, shortening the falling stroke of the glass and the mold, and preventing the glass from slipping and deviating.

[0028] The upper convex mold continues to move downward, pushing the glass into the lower concave mold. After the glass contacts the lower concave mold, the T-shaped lifting roller frame is deflected outward around the hinge axis by the glass pressure, pulling the tension spring to extend until the T-shaped lifting roller frame is completely deflected to the outside of the lower concave mold and does not obstruct the glass forming. The upper convex mold continues to press down, so that the glass completely fits the inner contour of the lower concave mold. This state is maintained for a period of time to ensure that the glass forming is stable and the bending is completed.

[0029] S4. Glass Cooling and Transfer

[0030] After bending is completed, the hydraulic rod is activated in reverse to move the upper convex mold smoothly upward along the lower sliding rod until the upper convex mold is completely separated from the lower concave mold to avoid rubbing against the formed glass. Then, the roller conveyor belt is activated to transfer the lower concave mold carrying the formed glass to the area below the arc-shaped nozzle of the cooling component.

[0031] Simultaneously, the control valve of the cooling component is opened, allowing the cooling medium in the liquid nitrogen storage tank to be transported to the arc-shaped nozzle through the gas distribution pipe. The cooling medium is then evenly sprayed onto the formed glass through the arc-shaped nozzle to prevent localized rapid cooling that could cause the glass to crack. Once the glass temperature has dropped to a safe range for transfer, the control valve is closed, and the roller conveyor belt is started to transfer the cooled glass to the next process.

[0032] The beneficial effects of this invention are:

[0033] 1. In this invention, after the glass is embedded in the concave mold and hot-bending is completed, the roller conveyor belt directly drives the concave mold carrying the formed glass to move precisely, avoiding the shape deviation caused by the separation of glass and mold in traditional transfer. When the concave mold is delivered to the bottom of the arc-shaped nozzle, the hot glass is cooled by uniform air jetting through the arc-shaped nozzle, which effectively prevents the shape rebound caused by untimely cooling. The glass shape is kept stable throughout the entire process from post-forming transfer to cooling and fixing, completely solving the problem of shape loss of control in the transfer process.

[0034] 2. In this invention, when the hydraulic rod pushes the upper convex mold downward, the transmission shaft drives the lifting gear to mesh with the lifting rack of the U-shaped support frame, causing the U-shaped support frame to move upward along the lifting slide bar and embed into the positioning slot at the bottom of the lower concave mold. This lifts the lower concave mold upward, shortening the distance between it and the glass, reducing the risk of the glass slipping off the lifting wheel. At the same time, the guide gear, in conjunction with the guide rack, drives the symmetrical rollers to smoothly separate to both sides along the guide slide bar, ensuring that the glass falls centered above the lower concave mold, avoiding forming deviations caused by glass offset during the transfer process.

[0035] 3. In this invention, when the upper convex mold is continuously pressed down, the T-shaped lifting roller frame deflects around the hinge axis under the pressure of the glass. The tension spring stretches and deforms, causing the lifting roller frame to fit against the side of the mold, avoiding local deformation caused by hard contact with the bottom of the glass, and ensuring that the glass is completely embedded in the lower concave mold for forming. At the same time, the meshing transmission of the transmission gear, the first bevel gear and the second bevel gear realizes the synchronous linkage of the lifting and lowering of the U-shaped lifting frame and the separation of the roller row, ensuring the alignment accuracy of the glass and the mold and improving the consistency of the hot bending finished product quality. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 This is a three-dimensional structural diagram showing the relative positions of the upper convex mold and the lower concave mold in this invention;

[0039] Figure 3 This is a side view showing the relative positions of the upper convex mold and the lower concave mold in this invention;

[0040] Figure 4 This is a three-dimensional structural diagram of the transmission shaft in this invention;

[0041] Figure 5 This is a schematic diagram of the internal structure of the upper convex mold and the lower concave mold in this invention;

[0042] Figure 6 This is a three-dimensional structural diagram of the roller array in this invention;

[0043] Figure 7 This is an exploded view of the internal structure of the lifting slide and the alignment slide in this invention;

[0044] Figure 8 This is an exploded view of the connection relationship between the U-shaped support frame and the roller conveyor belt in this invention;

[0045] Figure 9 This is a side view of the arched base in this invention;

[0046] Figure 10 This is a schematic diagram of the overall structure of the cooling component in this invention.

[0047] The attached diagram is labeled as follows: 1. Arched base; 2. Gantry frame; 3. Roller feeder belt; 4. Roller row; 5. Roller transfer belt; 6. Upper convex mold; 7. Lower concave mold; 8. T-shaped lifting roller frame; 9. Tension spring; 10. Guide slide bar; 11. Guide rack; 12. Guide gear; 13. First bevel gear; 14. Drive shaft; 15. Second bevel gear; 16. Drive gear; 17. Drive rack; 18. Lowering slide bar; 19. Hydraulic rod; 20. Lifting gear; 21. Lifting slide bar; 22. U-shaped 23. Lifting frame; 24. Lifting rack; 25. Positioning slot; 26. Abutting wheel; 27. Lifting slide; 28. Lifting frame; 29. ​​Lifting slide rod; 30. Electric push rod; 31. Alignment slide; 32. Alignment slider; 33. Sliding guide groove; 34. Sliding push rod; 35. Liquid nitrogen storage tank; 36. Gas distribution pipe; 37. Arc-shaped nozzle; 38. Control valve; 39. Controller; 40. Temperature sensor; 41. Arc-shaped electric heater; 42. Laser receiving unit; 43. Laser emitting unit. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] A glass hot bending process and its apparatus are disclosed. The glass sheet hot bending process is the core technology, which solves the problems of gravity sinking during the transfer stage, shape rebound due to lack of timely cooling after forming, and excessive curvature caused by misalignment in traditional hot bending by the coordinated management and control of the entire process of transportation, forming, and cooling, and the coordinated operation of multiple structural support and protection. The glass sheet hot bending apparatus belongs to the field of glass forming equipment technology and is specifically designed to achieve stress-free deformation, precise curved surface forming, and uniform gradient cooling of glass during the hot bending process by using alternating support switching of rollers and lifting wheels, precise positioning structure of laser alignment unit and U-shaped lifting frame, mold temperature control design of arc electric heater, and liquid nitrogen uniform cooling component of arc nozzle.

[0050] A glass hot bending device, such as Figures 1-8 As shown, it includes an arched base 1, a gantry frame 2 fixedly connected to the top of the arched base 1, a roller feed belt 3 fixedly connected to one side of the arched base 1, roller rows 4 symmetrically arranged on the top of the arched base 1, a roller transfer belt 5 arranged inside the arched base 1, an upper convex mold 6 arranged inside the gantry frame 2, a lower concave mold 7 placed on the top of the roller transfer belt 5, roller rows 4 arranged between the upper convex mold 6 and the lower concave mold 7, the output end of the roller feed belt 3 aligned with the roller rows 4, a T-shaped lifting roller frame 8 symmetrically hinged to one end of the lower concave mold 7, a tension spring 9 hooked at the bottom of the T-shaped lifting roller frame 8, and the bottom of the tension spring 9 fixedly connected to the lower concave mold 7.

[0051] The arched base 1 is equipped with a control component and a cooling component at one end. The control component is used to control the mold temperature and position the concave mold 7. The cooling component is used to cool the formed glass evenly. The positioning concave mold 7 carrying the glass is directly transferred from below the convex mold 6 to the cooling component by the roller conveyor belt 5. This can avoid deformation caused by gravity during the transfer of high temperature glass, and achieve stable hot bending and cooling.

[0052] Among them, a pair of guide slide rods 10 are symmetrically slidably connected to the top of the arched base 1, two roller rows 4 are fixedly connected to the two adjacent guide slide rods 10 respectively, a guide rack 11 is fixedly connected to one end of the roller row 4, a guide gear 12 that meshes with the guide rack 11 is symmetrically rotatably connected to the top of the arched base 1, a first bevel gear 13 is fixedly connected to one end of the guide gear 12, a transmission shaft 14 is rotatably connected to the top of the arched base 1, and a second bevel gear 15 that meshes with the first bevel gear 13 is symmetrically fixedly connected to one end of the transmission shaft 14;

[0053] Furthermore, a transmission gear 16 is fixedly connected to the middle section of the transmission shaft 14, a transmission rack 17 that meshes with the transmission gear 16 is fixedly connected to one end of the upper protruding mold 6, a downward sliding rod 18 is symmetrically fixedly connected to the top of the upper protruding mold 6, one end of the downward sliding rod 18 passes through the gantry frame 2 and is slidably connected to the gantry frame 2, a hydraulic rod 19 is fixedly connected to the top of the gantry frame 2, the output end of the hydraulic rod 19 passes through the gantry frame 2 and is fixedly connected to the upper protruding mold 6;

[0054] Furthermore, a lifting gear 20 is symmetrically fixedly connected to one end of the drive shaft 14, a lifting slide rod 21 is symmetrically slidably connected to one end of the arched base 1, a U-shaped lifting frame 22 is fixedly connected to the top of the two lifting slide rods 21, a lifting rack 23 that meshes with the lifting gear 20 is symmetrically fixedly connected to the top of the U-shaped lifting frame 22, a positioning slot 24 is symmetrically opened at the bottom of the concave mold 7, one end of the U-shaped lifting frame 22 passes through the roller conveyor belt 5 and is embedded in the interior of the positioning slot 24.

[0055] In use, firstly, the hydraulic rod 19 is set as the power source to push the upper convex mold 6 to move vertically along the lower sliding rod 18. The end transmission rack 17 meshes with the transmission gear 16 in the middle section of the transmission shaft 14, converting the vertical motion into the rotational power of the transmission shaft 14. Then, the second bevel gears 15 at both ends drive the guide gear 12 to rotate, thereby realizing the horizontal movement of the roller rack 4.

[0056] When the hydraulic rod 19 pushes the upper convex mold 6 downward, the transmission gear 16 rotates synchronously, driving the lifting gears 20 at both ends of the transmission shaft 14 to rotate, meshing with the lifting rack 23 at the top of the U-shaped support frame 22, causing the U-shaped support frame 22 to move upward along the lifting slide bar 21, and its end is embedded in the positioning slot 24 at the bottom of the lower concave mold 7, lifting the lower concave mold 7 upward, shortening the distance with the glass, and reducing the risk of slippage;

[0057] Then, the guide gear 12 rotates with the transmission shaft 14 through the meshing of the first bevel gear 13 and the second bevel gear 15, driving the guide rack 11 to move, so that the symmetrically arranged rollers 4 are smoothly separated to both sides along the guide slide bar 10, releasing the glass to the top of the concave mold 7, ensuring that the glass falls in the center;

[0058] Next, the upper convex mold 6 continues to press down, pushing the glass into the lower concave mold 7. The T-shaped lifting roller frame 8 deflects around the hinge axis under the pressure of the glass, and the tension spring 9 stretches and deforms, so that the lifting roller frame fits against the side of the mold, avoiding interference with the glass forming. Finally, the hot bending is completed through the cooperation of the upper and lower molds.

[0059] like Figures 2-4 and Figures 6-8As shown, the end of the roller rack 4 away from the roller feed belt 3 is rotatably connected to an abutment wheel 25. Three lifting grooves 26 are evenly opened at one end of the roller rack 4. A lifting frame 27 is inserted into the three lifting grooves 26. One end of the lifting frame 27 passes through the lifting groove 26 and is rotatably connected to a lifting wheel 28. The rotation direction of the lifting wheel 28 is perpendicular to the rotation direction of the roller rack 4. Lifting slide rods 29 are symmetrically fixedly connected to the bottom of the lifting frame 27. One end of the lifting slide rod 29 passes through the roller rack 4 and is slidably connected to the roller rack 4. An electric push rod 30 is fixedly connected to the bottom of the roller rack 4. The output end of the electric push rod 30 passes through the roller rack 4 and is fixedly connected to the lifting frame 27.

[0060] The roller rack 4 is symmetrically provided with alignment grooves 31 at the top. Alignment sliders 32 are slidably connected inside the alignment grooves 31. A sliding guide groove 33 is inclinedly provided at the top of the alignment sliders 32. A sliding push rod 34 is symmetrically rotatably connected to the top of the lifting frame 27. One end of the sliding push rod 34 passes through the sliding guide groove 33 and rolls against the sliding guide groove 33.

[0061] In use, firstly, the lifting wheel 28 at the top of the lifting frame 27 rotates in a direction perpendicular to the roller row 4. When the roller row 4 separates to both sides, the lifting wheel 28 only moves longitudinally with the glass, reducing lateral friction and avoiding scratching the glass surface.

[0062] Then, after the glass reaches the roller row 4, the electric push rod 30 is activated, the lifting frame 27 rises until the lifting wheel 28 contacts the bottom of the glass, and during the upward movement of the lifting frame 27, the sliding push rod 34 slides along the sliding guide groove 33. Due to the inclined design of the guide groove, it pushes the alignment slider 32 to move towards the center of the glass until the sliders on both sides lightly touch the edge of the glass, completing the left and right alignment and ensuring that the glass is accurately located directly above the mold.

[0063] like Figure 1 and Figure 5 , Figure 9 , Figure 10 As shown, the cooling assembly includes a liquid nitrogen storage tank 35 fixedly connected to the top of the arched base 1. A gas distribution pipe 36 is fixedly connected to the output end of the liquid nitrogen storage tank 35. Three arc-shaped nozzles 37 are evenly connected to the output end of the gas distribution pipe 36. The arc-shaped nozzles 37 are installed between the arched base 1 and the roller conveyor belt 5. A control valve 38 is provided at the input end of the gas distribution pipe 36.

[0064] The control component includes a controller 39 fixedly connected to the top of the arched base 1. Heating grooves are provided inside the upper convex mold 6 and the lower concave mold 7. A temperature sensor 40 and an arc-shaped electric heater 41 are fixedly connected inside the heating groove. The controller 39 is electrically connected to the temperature sensor 40 and the arc-shaped electric heater 41.

[0065] Furthermore, the control assembly also includes a laser receiving unit 42 fixedly connected to the inner side of the arched base 1, a laser emitting unit 43 fixedly connected to one side of the recessed mold 7, and a controller 39 electrically connected to the laser receiving unit 42 and the laser emitting unit 43.

[0066] In use, firstly, before hot bending, the controller 39 presets the required hot bending temperature of the mold according to parameters such as the material and thickness of the glass. Then, during the heating process, the temperature sensor 40 collects the surface temperature data of the mold in real time, and the controller 39 dynamically adjusts the heating power of the arc-shaped electric heater 41 to make the surface temperature of the mold match the hot bending temperature of the glass, thereby reducing problems such as local overheating deformation and cracking caused by overcooling of the glass due to temperature difference.

[0067] During the processing, the laser receiving unit 42 inside the arched base 1 cooperates with the laser emitting unit 43 on the side of the concave mold 7 to realize real-time monitoring of the position of the concave mold 7. When the concave mold 7 moves under the drive of the roller conveyor belt 5, the laser emitting unit 43 continuously emits a laser beam, and the laser receiving unit 42 receives the beam. When the mold position is offset, the position of the laser signal received by the laser receiving unit 42 will also change accordingly. By analyzing the deviation of the signal, the controller 39 can accurately calculate the offset of the concave mold 7 and immediately send a command to the roller conveyor belt 5. By finely adjusting the running speed or direction of the roller conveyor belt 5, the position of the concave mold 7 is precisely adjusted to ensure the precise alignment of the upper and lower molds with the glass.

[0068] Next, after the glass is bent, the concave mold 7 moves the formed glass along the roller conveyor belt 5 to below the arc-shaped nozzle 37. At this time, the controller 39 opens the control valve 38, and liquid nitrogen is sprayed evenly from the arc-shaped nozzle 37, covering the surface of the formed glass. After the temperature sensor 40 detects that the glass temperature has dropped to the safe transport range, the internal stress of the glass is basically stable, and the control valve 38 is closed to complete one hot bending cycle.

[0069] A glass hot bending process includes the following steps:

[0070] S1. Glass pretreatment and loading / positioning

[0071] First, wipe the glass surface with a dust-free cleaning tool to remove oil, dust and other impurities to avoid bubbles or scratches after bending. Then, heat the pre-treated glass to a hot bending temperature suitable for its material and place it on the roller feeder 3.

[0072] Then start the roller feeder belt 3 to transport the glass to the top of the roller row 4 on the arched base 1 until one end of the glass makes smooth contact with the contact wheel 25 of the roller row 4. After confirming that the glass does not shift back and forth, stop the roller feeder belt 3.

[0073] Next, the electric push rod 30 at the bottom of the roller rack 4 is activated, which pushes the lifting frame 27 to move the lifting wheel 28 towards the bottom of the glass until the lifting wheel 28 is completely in contact with the bottom of the glass and forms a stable support. During the movement of the lifting frame 27, the sliding push rod 34 is simultaneously driven to slide along the sliding guide groove 33, pushing the alignment slider 32 to extend from the alignment groove 31 to clamp and calibrate both sides of the glass until the center line of the glass is aligned with the preset center line of the concave mold 7, thus completing the loading and positioning.

[0074] S2. Positioning and preheating of the concave mold

[0075] First, start the roller conveyor belt 5 to transport the concave mold 7 to the area directly below the roller row 4. At the same time, start the laser emitting unit 43 and the laser receiving unit 42 of the control component to monitor the position of the concave mold 7 through laser alignment. If a misalignment is found between the concave mold 7 and the glass, the operation of the roller conveyor belt 5 is finely adjusted by the controller 39 until the center line of the concave mold 7 coincides with the center line of the glass, and then the roller conveyor belt 5 is stopped.

[0076] Then, the arc-shaped electric heater 41 is activated to preheat the concave mold 7 and the convex mold 6 inside the gantry 2. During the preheating process, the mold temperature is monitored in real time by the temperature sensor 40 to ensure that the mold temperature is compatible with the glass hot bending temperature and to avoid excessive temperature difference that could cause the glass to break during bending. After the mold temperature stabilizes, the arc-shaped electric heater 41 is turned off and the glass enters the bending state.

[0077] S3, Glass bending forming

[0078] First, start the hydraulic rod 19 at the top of the gantry 2 to push the upper convex mold 6 downward along the lower sliding rod 18 at a steady speed to avoid glass impact and breakage due to excessive speed. During the downward movement of the upper convex mold 6, the transmission rack 17 at one end meshes with the transmission gear 16 of the transmission shaft 14, driving the transmission shaft 14 and the second bevel gears 15 at both ends to rotate.

[0079] The second bevel gear 15 meshes with the first bevel gear 13, driving the guide gear 12 to move the guide rack 11, pulling the two roller rows 4 to move smoothly away from both sides until the roller rows 4 are completely detached from under the glass, avoiding friction and scratches with the glass.

[0080] At the same time, the lifting gear 20 at one end of the drive shaft 14 meshes with the lifting rack 23, driving the U-shaped lifting frame 22 to move upward, so that the U-shaped lifting frame 22 is embedded in the positioning slot 24 of the concave mold 7, lifting the concave mold 7 upward, shortening the falling stroke of the glass and the mold, and preventing the glass from slipping and deviating.

[0081] The upper convex mold 6 continues to move downward, pushing the glass into the lower concave mold 7. After the glass contacts the lower concave mold 7, the T-shaped lifting roller frame 8 is deflected outward around the hinge axis by the glass pressure, pulling the tension spring 9 to extend until the T-shaped lifting roller frame 8 is completely deflected to the outside of the lower concave mold 7 and does not obstruct the glass forming. The upper convex mold 6 continues to press down, so that the glass completely fits the inner contour of the lower concave mold 7. This state is maintained for a period of time to ensure that the glass forming is stable and the bending is completed.

[0082] S4. Glass Cooling and Transfer

[0083] After bending is completed, the hydraulic rod 19 is activated in the reverse direction, which drives the upper convex mold 6 to move smoothly upward along the lower sliding rod 18 until the upper convex mold 6 is completely separated from the lower concave mold 7 to avoid rubbing against the formed glass. The roller conveyor belt 5 is activated to transfer the lower concave mold 7 carrying the formed glass to the area below the arc-shaped nozzle 37 of the cooling component.

[0084] Simultaneously, the control valve 38 of the cooling component is opened, allowing the cooling medium in the liquid nitrogen storage tank 35 to be transported to the arc-shaped nozzle 37 through the gas distribution pipe 36. The cooling medium is then evenly sprayed onto the formed glass through the arc-shaped nozzle 37 to prevent localized rapid cooling that could cause the glass to crack. Once the glass temperature has dropped to a safe range for transport, the control valve 38 is closed, and the roller conveyor belt 5 is started to transport the cooled glass to the next process.

[0085] The working principle of the glass hot bending process and hot bending device provided by this invention is as follows:

[0086] First, the glass heated to the hot bending temperature is conveyed to the top of the roller row 4 by the roller feeder 3. The roller row 4 provides stable support for the glass, and at the same time, one end of the glass abuts against the contact wheel 25, which effectively prevents the glass from falling off the top of the roller row 4 and achieves preliminary alignment of the front and back of the glass. Then, the electric push rod 30 is activated, which pushes the lifting frame 27 to slide along the length of the lifting slide rod 29, driving the lifting wheel 28 to move to the bottom of the glass and form a support.

[0087] At the same time, the lifting frame 27 synchronously drives the sliding push rod 34 to slide along the sliding guide groove 33 at the top of the alignment slider 32, pushing the alignment slider 32 out from the alignment groove 31, thereby clamping and aligning the glass between the two roller rows 4, ensuring that the glass is precisely above the concave mold 7.

[0088] The concave mold 7 is transported by the roller conveyor belt 5 to the bottom of the roller row 4. The laser receiving unit 42 and the laser emitting unit 43 work together to guide the position of the concave mold 7, ensuring the alignment accuracy between the concave mold 7 and the glass.

[0089] Next, before bending the glass, the arc-shaped electric heater 41 is activated to heat the surface of the upper convex mold 6 inside the gantry 2 and the lower concave mold 7 at the top of the roller conveyor belt 5, so as to reduce the temperature difference between the glass and the upper convex mold 6 and the lower concave mold 7, and avoid glass breakage or forming defects due to temperature difference during bending. At the same time, the temperature sensor 40 monitors the temperature of the upper convex mold 6 and the lower concave mold 7 in real time to ensure that the mold temperature is maintained within a reasonable range suitable for hot bending of glass.

[0090] Subsequently, the hydraulic rod 19 is activated to bend and shape the glass. The hydraulic rod 19 pushes the upper convex mold 6 to move down along the length of the lower sliding rod 18. During the downward movement of the upper convex mold 6, the transmission rack 17 fixed at one end meshes with the transmission gear 16 in the middle section of the transmission shaft 14, causing the transmission gear 16 to rotate. This causes the transmission shaft 14 and the second bevel gears 15 at both ends to rotate synchronously. The second bevel gear 15 meshes with the first bevel gear 13 at one end of the guide gear 12, driving the guide gear 12 to rotate.

[0091] At the same time, the guide gear 12 meshes with the guide rack 11 at one end of the roller row 4, driving the guide rack 11 to pull the two roller rows 4 to move away from each other, so that the glass that was originally supported on the top of the lifting wheel 28 is centered and removed from the top of the two roller rows 4, and falls smoothly on the top of the T-shaped lifting roller frame 8 hinged at one end of the concave mold 7. Since the rotation direction of the lifting wheel 28 is perpendicular to the rotation direction of the roller row 4, the friction between the lifting wheel 28 and the glass is less than the friction between the roller row 4 and the glass, reducing the possibility of scratches on the glass surface.

[0092] At the same time, the lifting gear 20 at one end of the drive shaft 14 rotates with the drive shaft 14 and meshes with the lifting rack 23 at the top of the U-shaped lifting frame 22, causing the U-shaped lifting frame 22 to move up along the length of the lifting slide bar 21, so that one end of the U-shaped lifting frame 22 passes through the roller conveyor belt 5 and is embedded in the positioning slot 24 at the bottom of the concave mold 7, lifting the concave mold 7 to move up to shorten the stroke between the concave mold 7 and the glass, reducing the accidental situation such as deviation that may occur when the glass falls.

[0093] Meanwhile, the upper convex mold 6 continues to move downward, pushing the glass that falls on the top of the two T-shaped lifting roller frames 8 into the lower concave mold 7 and pressing it into shape. During this process, the T-shaped lifting roller frame 8 is subjected to force and deflects outward around the hinge axis, pulling the tension spring 9 to produce extension deformation. Finally, the T-shaped lifting roller frame 8 deflects to the outside of the lower concave mold 7 and no longer forms resistance to the bottom of the glass, ensuring that the glass is completely embedded into the lower concave mold 7 for shaping.

[0094] Finally, the hydraulic rod 19 is activated in reverse, causing the upper convex mold 6 to move upward along the length of the lower sliding rod 18 and disengage from the interior of the lower concave mold 7. Then, the roller conveyor belt 5 is activated, which drives the lower concave mold 7 carrying the formed glass to move downward under the arc-shaped nozzle 37. After the lower concave mold 7 reaches the designated cooling position, the control valve 38 is opened to release the seal on the gas distribution pipe 36. The nitrogen gas inside the liquid nitrogen storage tank 35 is transported to the arc-shaped nozzle 37 through the gas distribution pipe 36 and evenly sprayed into the interior of the lower concave mold 7 through the arc-shaped nozzle 37 to uniformly cool the formed glass inside the lower concave mold 7.

[0095] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A glass heat bending apparatus, characterized by: The utility model provides an arch base (1), the top fixed connection of arch base (1) has gantry (2), one side of arch base (1) is fixedly connected with roll type feeding belt (3), the top symmetry of arch base (1) is provided with roll row (4), the inside of arch base (1) is provided with roll type transfer belt (5), the inside of gantry (2) is provided with upper male die (6), the top of roll type transfer belt (5) places lower female die (7), roll row (4) is arranged between upper male die (6) and lower female die (7), the output end of roll type feeding belt (3) is aligned with roll row (4), one end of lower female die (7) is symmetrically hinged with T-shaped lifting roller frame (8), the bottom of T-shaped lifting roller frame (8) is hooked with tension spring (9), the bottom of tension spring (9) is fixedly connected with lower female die (7), one end of roll row (4) is fixedly connected with guide rack (11), The top rotationally connected of arch base (1) has transmission shaft (14), one end of transmission shaft (14) is fixedly connected with lifting gear (20) symmetrically, one end of arch base (1) is slidably connected with lifting slide rod (21) symmetrically, the top of two lifting slide rods (21) is fixedly connected with U-shaped lifting frame (22), the top of U-shaped lifting frame (22) is fixedly connected with lifting rack (23) engaged with lifting gear (20) symmetrically, the bottom of lower female die (7) is symmetrically provided with positioning clamping groove (24), one end of U-shaped lifting frame (22) passes through roll type transfer belt (5) and is embedded in the inside of positioning clamping groove (24), The end away from roll type feeding belt (3) of roll row (4) is rotationally connected with abutting wheel (25), one end of roll row (4) is uniformly provided with three lifting sliding grooves (26), three lifting sliding grooves (26) are inserted with lifting frame (27), one end of lifting frame (27) passes through lifting sliding groove (26) and is rotationally connected with lifting wheel (28), the rotation direction of lifting wheel (28) is perpendicular to the rotation direction of roll row (4), the bottom of lifting frame (27) is fixedly connected with lifting slide rod (29) symmetrically, one end of lifting slide rod (29) passes through roll row (4) and is slidably connected with roll row (4), the bottom of roll row (4) is fixedly connected with electric push rod (30), the output end of electric push rod (30) passes through roll row (4) and is fixedly connected with lifting frame (27), One end of arch base (1) is provided with control assembly and cooling assembly, control assembly is used for controlling die temperature and positioning lower female die (7), cooling assembly is used for uniformly cooling to the glass of shaping, positioning lower female die (7) with glass is directly transferred from the lower side of upper male die (6) to cooling assembly through roll type transfer belt (5), can avoid the deformation of high temperature glass transfer due to its gravity traction, realizes stable heat bending and cooling; The middle segment of transmission shaft (14) is fixedly connected with transmission gear (16), one end of upper male die (6) is fixedly connected with transmission rack (17) engaged with transmission gear (16). One end of the transmission shaft (14) is fixedly connected with a second bevel gear (15) symmetrically, the top of the arched base (1) is rotatably connected with a first bevel gear (13) engaged with the second bevel gear (15) symmetrically, one end of the first bevel gear (13) is fixedly connected with a guide gear (12).

2. The glass thermal bending apparatus of claim 1, wherein: The top of the arched base (1) is slidably connected with a pair of guide sliding rods (10) symmetrically, and the two roller rows (4) are fixedly connected with two adjacent guide sliding rods (10) respectively.

3. The glass thermal bending apparatus of claim 2, wherein: The top of the upper male die (6) is fixedly connected with a pressing sliding rod (18) symmetrically, one end of the pressing sliding rod (18) penetrates through the gantry (2) and is slidably connected with the gantry (2), the top of the gantry (2) is fixedly connected with a hydraulic rod (19), the output end of the hydraulic rod (19) penetrates through the gantry (2) and is fixedly connected with the upper male die (6).

4. The glass thermal bending apparatus of claim 3, wherein: The top of the roller row (4) is symmetrically provided with an alignment sliding groove (31), the inside of the alignment sliding groove (31) is slidably connected with an alignment sliding block (32), the top of the alignment sliding block (32) is obliquely provided with a sliding guide groove (33), the top of the lifting frame (27) is rotatably connected with a sliding push rod (34), one end of the sliding push rod (34) penetrates through the sliding guide groove (33) and is rollingly abutted with the sliding guide groove (33).

5. The glass thermal bending apparatus of claim 4, wherein: The cooling assembly comprises a liquid nitrogen storage tank (35) fixedly connected to the top of the arched base (1), the output end of the liquid nitrogen storage tank (35) is fixedly connected with a gas distribution pipe (36), the output end of the gas distribution pipe (36) is uniformly connected with three arc-shaped nozzles (37), the arc-shaped nozzles (37) are installed between the arched base (1) and the roller type transfer belt (5), and the input end of the gas distribution pipe (36) is provided with a control valve (38).

6. The glass thermal bending apparatus of claim 1, wherein: The control assembly comprises a controller (39) fixedly connected to the top of the arched base (1), the inside of the upper male die (6) and the lower female die (7) is provided with a heating groove, the inside of the heating groove is fixedly connected with a temperature sensor (40) and an arc-shaped electric heater (41), and the controller (39) is electrically connected with the temperature sensor (40) and the arc-shaped electric heater (41).

7. The glass thermal bending apparatus of claim 6, wherein: The control assembly further comprises a laser receiving unit (42) fixedly connected to the inner side of the arched base (1), one side of the lower female die (7) is fixedly connected with a laser emitting unit (43), and the controller (39) is electrically connected with the laser receiving unit (42) and the laser emitting unit (43).

8. A glass thermal bending process characterized by: The glass hot bending device comprises the following steps: S1, glass pretreatment and feeding positioning First, wipe the glass surface with a dust-free cleaning tool to remove oil and dust, avoid air bubbles or scratches after bending, then heat the pretreated glass to the preset hot bending temperature, and then place it on the roller feeding belt (3); Then start the roller feeding belt (3), and convey the glass to above the roller row (4) on the top of the arched base (1), until the glass end abuts against the abutting wheel (25) of the roller row (4) stably, and then pause the roller feeding belt (3) after confirming that the glass is not offset front and back; Then start the electric push rod (30) at the bottom of the roller row (4), push the lifting frame (27) to drive the lifting wheel (28) to move to the bottom of the glass, until the lifting wheel (28) is completely matched with the bottom of the glass, forming a stable lifting, and in the process of moving the lifting frame (27), the sliding push rod (34) is driven to slide along the sliding guide groove (33), pushing the alignment slider (32) to extend from the alignment sliding groove (31), clamping and aligning the two sides of the glass, until the center line of the glass is aligned with the preset center line of the lower concave mold (7), completing the positioning of the glass; S2, lower concave mold positioning and mold preheating First, start the roller transfer belt (5) to transfer the lower concave mold (7) to the area directly below the roller row (4), and start the laser emitting unit (43) and the laser receiving unit (42) of the control assembly, and monitor the position of the lower concave mold (7) through laser alignment: if it is found that there is an alignment deviation between the lower concave mold (7) and the glass, adjust the operation of the roller transfer belt (5) through the controller (39), until the center line of the lower concave mold (7) coincides with the center line of the glass, stop the roller transfer belt (5); Then start the arc-shaped electric heater (41) to preheat the lower concave mold (7) and the upper convex mold (6) in the gantry (2), and monitor the mold temperature in real time through the temperature sensor (40) during the preheating process, to ensure that the mold temperature is adapted to the glass bending temperature, and after the mold temperature is stable, turn off the arc-shaped electric heater (41), and enter the state of waiting for bending; S3, glass bending forming First, start the hydraulic rod (19) at the top of the gantry (2) to push the upper convex mold (6) to move downward along the downward sliding rod (18), and in the process of moving downward of the upper convex mold (6), the transmission rack (17) at one end is engaged with the transmission gear (16) of the transmission shaft (14), driving the transmission shaft (14) and the second bevel gear (15) at both ends to rotate; The second bevel gear (15) is engaged with the first bevel gear (13), driving the guide gear (12) to drive the guide rack (11) to move, pulling the two roller rows (4) to move away from both sides, until the roller row (4) completely separates from the glass below, avoiding friction and scratching the glass; At the same time, the lifting gear (20) at one end of the transmission shaft (14) is engaged with the lifting rack (23), driving the U-shaped lifting frame (22) to move upward, so that the U-shaped lifting frame (22) is embedded in the positioning clamping groove (24) of the lower concave mold (7), lifting the lower concave mold (7) to move upward, shortening the falling distance of the glass and the mold, preventing the glass from sliding and deviating; The upper convex mold (6) continues to move downward, pushing the glass to embed into the lower concave mold (7) below, after the glass contacts the lower concave mold (7), the T-shaped lifting roller frame (8) is deflected outward around the hinge shaft under the pressure of the glass, pulling the tension spring (9) to stretch, until the T-shaped lifting roller frame (8) is completely deflected to the outside of the lower concave mold (7), not hindering the glass forming, the upper convex mold (6) continues to press downward, making the glass completely match the inner contour of the lower concave mold (7), keeping this state for a period of time to ensure the stability of the glass forming, completing the bending; S4, glass cooling and transfer After the bending is completed, the hydraulic rod (19) is started in reverse to drive the upper convex mold (6) to move upward along the lower pressing slide rod (18) stably until the upper convex mold (6) is completely separated from the lower concave mold (7) to avoid scratching the formed glass, and the roller transfer belt (5) is started to transfer the lower concave mold (7) carrying the formed glass to below the arc-shaped spray head (37) of the cooling assembly; At the same time, the control valve (38) of the cooling assembly is opened to make the cooling medium in the liquid nitrogen storage tank (35) be delivered to the arc-shaped spray head (37) through the gas distribution pipe (36), and the cooling medium is uniformly sprayed to the formed glass through the arc-shaped spray head (37) to avoid the local cooling being too fast to cause the glass to crack, and after the temperature of the glass is reduced to a safe transfer range, the control valve (38) is closed, and the roller transfer belt (5) is started to transfer the cooled glass to the next process.

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