Improved lens vacuum bending machine with controllable air exhaust

Abstract

The invention discloses an air exhaust controllable improved lens vacuum baking bending machine, which relates to the technical field of lenses, and comprises a bowl mold, a baking chamber and an air exhaust device, the bowl mold is used for placing a lens; the baking chamber is provided with a discharging port and a feeding port, the baking chamber is used for continuously heating the lens, and the bowl mold can enter the baking chamber from the feeding port and leave through the discharging port; an air passage is arranged between the air extractor and the bowl mold, the air extractor is communicated with a bowl mold space below the lens through the air passage, the bowl mold enters the baking chamber, the air passage is closed firstly and then gradually opened, when the air passage is in a closed state, the lens can be heated and softened by the baking chamber, and along with the gradual opening of the air passage, the lens can be baked. The air exhaust speed of the air exhaust device on the bowl mold space below the lens is gradually increased, so that the negative pressure formed in the bowl mold space below the lens is gradually increased, and the lens is gradually bent. According to the lens baking and bending device, lens baking and bending can be integrated, and the situation that the edge of a lens is wrinkled and poor due to too fast air exhaust is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of lenses, and particularly to an improved lens vacuum bending machine with controllable air extraction. Background Art

[0002] The current lens bending machine needs to be used in combination with an external baking device. First, the lens is placed in the external baking device to heat and soften the lens, and then the lens is taken out of the baking device and transferred to the bowl mold in the bending machine. The air in the bowl mold space below the lens is evacuated to form a negative pressure, so that the lens is bent by the atmospheric pressure. However, the lens will dissipate heat during the transfer from the baking device to the bowl mold, and the heat loss of the lens will cause incomplete baking of the lens, resulting in incomplete softening of the lens. After the incompletely softened lens is placed in the bowl mold of the bending machine, the air extraction device immediately starts to evacuate the air in the bowl mold space below the lens, and the incompletely heated and softened lens is bent under the action of the negative pressure, resulting in poor wrinkling at the edge of the lens. Summary of the Invention

[0003] The purpose of the present invention is to provide an improved lens vacuum bending machine with controllable air extraction, which can integrate the baking and bending of the lens, and after the lens is fully heated, gradually evacuate the air in the bowl mold space below the lens to form a negative pressure, so as to gradually bend the lens and avoid the occurrence of poor wrinkling at the edge of the lens caused by too fast air extraction.

[0004] To achieve the above purpose, the solution of the present invention is as follows:

[0005] An improved lens vacuum bending machine with controllable air extraction includes a bowl mold, a baking chamber, and an air extraction device; the bowl mold is used to place the lens; the baking chamber has a discharge port and a feed port. The lens is placed in the bowl mold outside the feed port, and the baking chamber is used to continuously heat the lens. The bowl mold can enter the baking chamber through the feed port and leave the baking chamber through the discharge port; an air duct is provided between the air extraction device and the bowl mold, and the air extraction device is connected to the bowl mold space below the lens through the air duct. After the bowl mold enters the baking chamber, the air duct can be closed first and then gradually opened. When the air duct is in the closed state, the lens can be heated and softened by the baking chamber. As the air duct is gradually opened, the air extraction rate of the air extraction device for the bowl mold space below the lens gradually increases, so that the negative pressure formed in the bowl mold space below the lens gradually increases, so as to gradually bend the lens.

[0006] Further, it further includes a vacuum column, with the bowl mold arranged on the top side of the vacuum column. The air duct is arranged inside the vacuum column, and the air duct communicates with the bowl mold space below the lens. A vacuum valve is arranged on the vacuum column, and the vacuum valve is used to open or close the air duct. The vacuum column drives the vacuum valve and the bowl mold to enter the baking chamber through the feeding port and leave the baking chamber through the discharging port. After entering the baking chamber, the vacuum valve can first close and then gradually open the air duct. The air extraction device is connected to the air duct. As the vacuum valve gradually opens the air duct, the air extraction rate of the air extraction device for the bowl mold space below the lens gradually increases, so that the negative pressure formed in the bowl mold space below the lens gradually increases, causing the lens to be gradually bent.

[0007] Further, the baking chamber further includes a control part, which is arranged along the moving path of the vacuum valve. The control part includes a first control part and a second control part. The first control part is connected to the feeding port. After the vacuum valve enters the feeding port, it is within the range of the first control part. The first control part is used to control the vacuum valve to close the air duct. The second control part is connected after the first control part. After the vacuum valve leaves the first control part, it immediately enters the range of the second control part. The second control part can control the vacuum valve to gradually open the air duct.

[0008] Further, the vacuum column drives the vacuum valve and the bowl mold to move horizontally in the baking chamber. The vacuum valve is vertically inserted through the vacuum column and can move up and down on the vacuum column. The vacuum valve is provided with air holes and a blocking area. The blocking area is located below the air holes. The air holes are used to communicate and open the air duct, and the blocking area is used to block and close the air duct. When the vacuum valve moves up, the air holes can be gradually misaligned with the air duct, and the blocking area can be gradually docked with the air duct, so that the air duct is gradually closed. When the vacuum valve moves down, the air holes can be gradually docked with the air duct, and the blocking area can be gradually misaligned with the air duct, so that the air duct is gradually opened. The control part is an orbit, which is arranged along the moving path of the vacuum valve and is located below the vacuum column. The orbit is divided into a flush area and a descending inclined area. The flush area is the first control part, and the top surface heights of the flush area are the same. When the vacuum valve enters the baking chamber from the feeding port, the lower end of the vacuum valve abuts against the top surface of the flush area. The flush area can abut against the vacuum valve and move it up, so that the blocking area is docked with the air duct to close the air duct. The descending inclined area is the second control part, and the top surface height of the orbit in the descending inclined area gradually decreases. After the vacuum valve enters the descending inclined area from the flush area, the vacuum valve gradually moves down, and the air holes and the air duct are gradually docked, gradually increasing the area of the air holes docked with the air duct, so that the air duct is gradually opened, thereby gradually increasing the air extraction rate of the air extraction device, causing the lens to be gradually bent due to the negative pressure.

[0009] Further, the shape of the air holes extends in a V-shaped expansion from the end close to the blocking area to the end far from the blocking area, and continues to extend in a rectangular shape in the direction far from the blocking area at the end of the V-shaped extension. The two side walls of the V-shaped expansion of the air holes bulge in an arc shape towards the center of the air holes.

[0010] Further, the vacuum valve includes an elastic member for elastically pushing the vacuum valve downward.

[0011] Further, the elastic member is a spring. The lower end of the spring is fixed to the lower end of the vacuum valve, and the upper end of the spring abuts against the lower side of the vacuum column.

[0012] Further, the baking chamber is a circular chamber having a notch. The two sides of the notch are respectively the feed port and the discharge port. The lens is placed into the bowl mold within the notch. A turntable is provided within the baking chamber. A sealed cavity is provided within the turntable. A plurality of vacuum columns are circumferentially arrayed around the turntable. The air channels are all connected to the sealed cavity. The sealed cavity is connected to an air extraction device. The turntable is connected to a driving device for rotating the turntable about its own axis, thereby driving the vacuum columns to rotate about the axis of the turntable, causing the vacuum columns to drive the vacuum valve and the bowl mold to circulate into the baking chamber from the feed port and leave the baking chamber through the discharge port.

[0013] Further, after the lens is placed in the bowl mold, a silica gel sheet is covered at the opening of the bowl mold.

[0014] Further, a heating device is further provided on the top wall of the baking chamber. The heating device includes a fan and a heating wire. The heating wire is annular and surrounds the fan for one week. The fan is used to blow air at 360° to the annular heating wire to diffuse the heat dissipated by the heating wire.

[0015] After adopting the above solution, the beneficial effects of the present invention are as follows:

[0016] (1) The present invention integrates a baking chamber and a bending machine. There is no need for an external baking device, nor is it necessary to transfer the lens, avoiding heat loss during the transfer of the lens and enabling the lens to be bent in a timely manner after being fully heated and softened.

[0017] (2) The bowl mold of the present invention enters the baking chamber from the feed port and leaves the baking chamber through the discharge port. After the bowl mold enters the baking chamber, the air channel can be closed first and then gradually opened. When the air channel is in the closed state, the lens can be fully heated and softened by the baking chamber. As the air channel is gradually opened, the air extraction rate of the air extraction device for the space of the bowl mold below the lens gradually increases, causing the negative pressure formed in the space of the bowl mold below the lens to gradually increase, so that the lens is gradually bent, avoiding the occurrence of poor wrinkles at the edge of the lens caused by too fast air extraction.

[0018] (3) The shape of the air hole of the present invention expands and extends in a V shape from one end close to the plugging area to the end far from the plugging area, and continues to extend in a rectangular shape in the direction far from the plugging area at the end of the V-shaped extension. The two side walls of the V-shaped expansion of the air hole bulge in an arc shape towards the center of the air hole; when the vacuum valve gradually moves downward and the air hole and the air passage are gradually butted, the air hole with the above shape can control the air extraction speed when butting the air passage, making the air extraction speed slow first and then fast, avoiding the too fast air extraction speed of the air extraction device, so as to achieve more precise control of the air extraction process and improve the quality and yield of lens bending. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of a preferred embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the structures of various components in the circular baking chamber of the present invention;

[0021] Figure 3 is a schematic diagram of the structure of the vacuum column Figure 1 ;

[0022] Figure 4 is a schematic diagram of the structure of the vacuum column Figure 2 ;

[0023] Figure 5 is a schematic diagram of the structure of the vacuum valve;

[0024] Figure 6 is a schematic diagram of the structure of the butting of the air passage and the plugging area;

[0025] Figure 7 is a schematic diagram of the structure of the conduction of the air passage and the air hole;

[0026] Figure 8 is a schematic diagram of the structure of the bowl mold;

[0027] Figure 9 is a schematic diagram of the connection between the turntable and the vacuum column;

[0028] Figure 10 is a schematic diagram of the structure of the heating device.

[0029] Reference Numeral Explanation:

[0030] 10. Baking chamber; 11. Feed inlet; 12. Discharge outlet; 13. Heating device; 131. Fan; 132. Air blower; 133. Heating wire; 14. Turntable; 141. Sealed cavity; 15. Notch; 16. Driving device; 20. Vacuum column; 201. Vacuum shaft; 202. Hexagonal copper column; 203. Threaded hole; 21. Vacuum valve; 211. Air hole; 212. Sealing area; 213. Insertion part; 214. Limiting part; 215. Elastic part; 22. Air duct; 23. Bowl mold; 231. Threaded column; 232. Air duct of bowl mold; 30. Track; 31. Flush area; 32. Descending inclined area; 40. Silicone sheet; 50. Lens. Detailed implementation mode

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation modes.

[0032] As Figures 1 to 10 described, this embodiment provides an improved lens 50 vacuum bending machine with controllable air extraction, which includes a bowl mold 23, a baking chamber 10, and an air extraction device; the bowl mold 23 is used to place the lens 50; the baking chamber 10 has a discharge outlet 12 and a feed inlet 11, and the lens 50 is placed in the bowl mold 23 outside the feed inlet 11. The baking chamber 10 is used to continuously heat the lens 50. The bowl mold 23 can enter the baking chamber 10 from the feed inlet 11 and leave the baking chamber 10 through the discharge outlet 12; an air duct 22 is provided between the air extraction device and the bowl mold 23. The air extraction device is connected to the space of the bowl mold 23 below the lens 50 through the air duct 22. After the bowl mold 23 enters the baking chamber 10, the air duct 22 can be closed first and then gradually opened. When the air duct 22 is in the closed state, the lens 50 can be fully heated and softened by the baking chamber 10. As the air duct 22 is gradually opened, the air extraction rate of the air extraction device for the space of the bowl mold 23 below the lens 50 gradually increases, so that the negative pressure formed in the space of the bowl mold 23 below the lens 50 gradually increases, so that the lens 50 is gradually bent. Specifically, the air extraction rate of the air extraction device for the space of the bowl mold 23 below the lens 50 can also be gradually increased by controlling the power output of the air extraction device itself.

[0033] Further, the bending and baking machine further includes a vacuum column 20. A bowl mold 23 is provided on the top side of the vacuum column 20. The air duct 22 is arranged inside the vacuum column 20. The air duct 22 communicates with the space of the bowl mold 23 below the lens 50. A vacuum valve 21 is provided on the vacuum column 20. The vacuum valve 21 is used to open or close the air duct 22. The vacuum column 20 drives the vacuum valve 21 and the bowl mold 23 to enter the baking chamber 10 from the feeding port 11 and leave the baking chamber 10 through the discharging port 12. The vacuum valve 21 can first close and then gradually open the air duct 22 after entering the baking chamber 10. An air extraction device is connected to the air duct 22. When the air duct 22 is gradually opened by the vacuum valve 21, the air extraction device extracts air from the bowl mold 23, and the air extraction rate gradually increases. It can be understood that the vacuum valve 21 can be, for example, an electromagnetic valve, an electric valve, or other valves that can achieve closing and gradually opening the air duct 23, which is not limited herein. It can be understood that gradually opening the air duct 22 through the vacuum valve 21 is more stable than increasing the air extraction rate by controlling the power output of the air extraction device itself. Moreover, by gradually opening the air duct 23 through the vacuum valve 21, the opening amount of the air duct 23 can be accurately controlled, so as to accurately control the air extraction rate of the air extraction device.

[0034] Further, the baking chamber 10 further includes a control unit. The control unit is arranged along the moving path of the vacuum valve 21. The control unit includes a first control unit and a second control unit. The first control unit is connected to the feeding port 11. After the vacuum valve 21 enters the feeding port 11, it is within the range of the first control unit. The first control unit is used to control the vacuum valve 21 to close the air duct 22. The second control unit is connected after the first control unit. After the vacuum valve 21 leaves the first control unit, it immediately enters the range of the second control unit. The second control unit can control the vacuum valve 21 to gradually open the air duct 22.

[0035] Such as Figure 1 、 Figure 2 、 Figure 9As shown, in a preferred embodiment, the baking chamber 10 is a circular chamber, which has a notch 15. On both sides of the notch 15 are the feed inlet 11 and the discharge outlet 12 respectively. The lens 50 is placed into the bowl mold 23 within the notch 15. A turntable 14 is provided within the baking chamber 10. A sealed cavity 141 is provided within the turntable 14. A plurality of vacuum columns 20 are circumferentially arrayed around the turntable 14 for one week, and the air channels 22 are all connected to the sealed cavity 141. The sealed cavity 141 is connected to an air extraction device. The turntable 14 is connected with a driving device 16. The driving device 16 is used to rotate the turntable 14 around its own axis, thereby driving the vacuum columns 20 to rotate around the axis of the turntable 14, so that the vacuum columns 20 drive the vacuum valves 21 and the bowl molds 23 to circulate into the baking chamber 10 from the feed inlet 11 and leave the baking chamber 10 through the discharge outlet 12. Specifically, the driving device 16 is, for example, a driving motor. Specifically, the turntable 14 is horizontally arranged within the baking chamber 10, and the driving motor drives the turntable 14 to horizontally rotate around its own axis, driving the vacuum columns 20 to rotate. In this embodiment, the moving path of the vacuum valve 21 is circular. Specifically, an air extraction hole 211 is provided in the sealed cavity 141, and the air extraction device is connected to the air extraction hole 211 to extract the air within the sealed cavity 141.

[0036] In addition, in other embodiments, the baking chamber 10 can be of other shapes that can allow the vacuum columns 20 to enter from the feed inlet 11 and exit from the discharge outlet 12, such as rectangular, annular, etc. One end of the rectangular baking chamber 10 is the feed inlet 11, and the other end is the discharge outlet 12. The vacuum columns 20 enter the baking chamber 10 from the feed inlet 11 and leave the baking chamber 10 through the discharge outlet 12. The annular baking chamber 10 has a notch, such that the annular baking chamber 10 is not connected end to end. One side of the notch is the feed inlet 11, and the other side is the discharge outlet 12. The lens 50 is loaded from the notch.

[0037] Specifically, as Figures 3 to 7As shown in the figure, the vacuum column 20 drives the vacuum valve 21 and the bowl mold 23 to move horizontally in the baking chamber 10. The vacuum valve 21 vertically penetrates and is inserted on the vacuum column 20, and it can move up and down on the vacuum column 20. The vacuum valve 21 is provided with air holes 211 and a blocking area 212. The blocking area 212 is located below the air holes 211. The air holes 211 are used to communicate and open the air passage 22, and the blocking area 212 is used to block and close the air passage 22. When the vacuum valve 21 moves up, the air holes 211 can be gradually misaligned with the air passage 22, and the blocking area 212 can be gradually docked with the air passage 22, so that the air passage 22 is gradually closed. When the vacuum valve 21 moves down, the air holes 211 can be gradually docked with the air passage 22, and the blocking area 212 can be gradually misaligned with the air passage 22, so that the air passage 22 is gradually opened; Preferably, the control part is the track 30. The track 30 is arranged along the moving path of the vacuum valve 21 and is located below the vacuum column 20. The track 30 is divided into a flush area 31 and a descending inclined area 32. The flush area 31 is the first control part, and the top surface heights of the flush area 31 are the same. When the vacuum valve 21 enters the baking chamber 10 from the feed port 11, the lower end of the vacuum valve 21 abuts against the top surface of the flush area 31. The flush area can abut against the vacuum valve 21 and move it upward, so that the blocking area 212 is docked with the air passage 22 to close the air passage 22. The descending inclined area 32 is the second control part, and the top surface height of the track 30 in the descending inclined area 32 gradually decreases. After the vacuum valve 21 enters the descending inclined area 32 from the flush area 31, the vacuum valve 21 gradually moves downward, and the air holes 211 and the air passage 22 are gradually docked, gradually increasing the area of the air holes 211 docked with the air passage 22, so that the air passage 22 is gradually opened, thereby gradually increasing the pumping rate of the pumping device, and the lens 50 is gradually bent due to negative pressure.

[0038] Specifically, the present invention can control the starting position of the descending inclined area 32, so that the lens 50 is pumped and bent only when the user needs it. Therefore, by setting the starting position of the descending inclined area 32, the pumping timing can also be controlled, ensuring that the lens 50 is gradually bent after being fully heated, and avoiding the edge wrinkling defect caused by the lens 50 not being fully softened by heat.

[0039] Specifically, the specific structure of the vacuum valve 21 includes an insertion part 213 and a limiting part 214. The insertion part 213 is used to penetrate and insert into the vacuum column 20. The limiting part 214 is located at the top end of the insertion part 213. After the insertion part 213 is inserted in place, the limiting part 214 abuts against the top side of the vacuum column 20 to limit the insertion part 213 from falling off the vacuum column 20 downward. Both the blocking area 212 and the air holes 211 are arranged on the insertion part 213.

[0040] Such as Figure 3 、 Figure 4 、 Figure 8As shown in the figure, specifically, the vacuum column 20 includes a vacuum shaft 201 and a hexagonal copper column 202, the ends of which are joined. A vacuum shaft air passage is provided inside the vacuum shaft 201, and a hexagonal copper column air passage is provided inside the hexagonal copper column 202. The vacuum shaft air passage and the hexagonal copper column air passage together form the air passage 22. A threaded hole 203 is provided on the vacuum shaft 201, and the threaded hole 203 communicates with the air passage 22. A threaded post 231 is provided at the bottom of the bowl mold 23 and is in contact with the threaded hole 203. The bowl mold 23 is detachably screwed into the threaded hole 203 of the vacuum shaft 201 through the threaded post 231. A bowl mold air passage 232 is provided inside the threaded post 231. One end of the bowl mold air passage 232 opens at the bottom of the bowl mold 23, and the other end opens at the bottom of the threaded post 231. When the bowl mold 23 is screwed into the threaded hole 203 of the vacuum shaft 201, the bowl mold air passage 232 communicates with the air passage 22. Preferably, two threaded holes 203 are provided on one vacuum shaft 201, and two bowl molds 23 can be detachably installed. The number of bowl molds 23 can be set according to the needs of the user and is not set here. The vacuum valve 21 is inserted vertically downward through the hexagonal copper column 202 to block and communicate with the hexagonal copper column air passage, thereby opening and closing the entire air passage 22.

[0041] As Figure 2 shown, in the above preferred embodiment, the track 30 is preferably annular. One end of the flush area 31 of the annular track 30 extends from the feed port 11 to the notch 15 and extends to the discharge port 12. The other end of the flush area 31 extends along the movement path of the vacuum valve 21 inside the baking chamber 10. One end of the descending inclined area 32 is connected to one end of the flush area 31 located inside the baking chamber 10. The other end of the descending inclined area 32 extends along the movement path of the vacuum valve 21 inside the baking chamber 10 and extends to the discharge port 12 and is connected to the end of the flush area 31 at the discharge port 12, thereby forming the annular track 30. Therefore, when the vacuum valve 21 is at the notch 15, it is pushed upward by the flush area 31, so that the blocking area 212 is aligned with the air passage 22. After one round of bending of the lens 50 is completed and it leaves the baking chamber 10 through the discharge port 12 and enters the notch 15, the flush area 31 pushes the vacuum valve 21 upward, closing the air passage 22 and preparing for the next round of bending of the lens 50.

[0042] Additionally, in other embodiments, the track 30 can also be set as an arc-shaped track 30 disposed below the vacuum valve 21 along the movement path of the vacuum valve 21. The arc-shaped track 30 also has a flush area 31 and a descending inclined area 32. One end of the flush area 31 extends from the feed port 11 into the notch 15, and a guiding surface is provided at the top of this end. The guiding surface extends obliquely upward and is connected to the top of the track 30 of the flush area 31. The other end of the flush area 31 extends along the movement path of the vacuum valve 21 within the baking chamber 10. One end of the descending inclined area 32 is connected after the flush area 31, and the other end of the descending inclined area 32 extends within the baking chamber 10 along the movement path of the vacuum valve 21 and has a gap with the discharge port 12 to form the arc-shaped track 30. Therefore, the vacuum valve 21 will move down from the descending inclined area 32 within the baking chamber 10, and then continue to move towards the discharge port 12. After completing one round of bending the lens 50, it leaves the baking chamber 10 from the discharge port 12 and enters the notch 15. After being guided by the guiding surface, the vacuum valve 21 then moves back onto the flush area 31. The flush area 31 abuts against the vacuum valve 21 upward to close the air passage 22 and prepare for the next round of bending the lens 50.

[0043] As Figures 5 to 7 shown, the shape of the air hole 211 extends in a V-shaped expansion from one end close to the blocking area 212 towards the end away from the blocking area 212, and continues to extend in a rectangular shape in the direction away from the blocking area 212 at the end of the V-shaped extension. Further, the two side walls of the V-shaped expansion of the air hole 211 are convex in an arc shape towards the center of the air hole 211. When the vacuum valve 21 gradually moves downward and the air hole 211 and the air passage 22 are gradually docked, the air hole 211 with the above shape can control the air extraction speed when docking with the air passage 22, making the air extraction speed slow first and then fast, avoiding the air extraction speed of the air extraction device being too fast, so as to achieve more precise control of the air extraction process and improve the quality and yield of bending the lens 50. Specifically, the air hole 211 and the air passage 22 partially overlap and do not completely overlap.

[0044] As Figure 3 、 Figure 4 shown, the vacuum valve 21 includes an elastic member 215, and the elastic member 215 is used to elastically push the vacuum valve 21 downward. Preferably, the elastic member 215 is a spring. The lower end of the spring is fixed to the lower end of the vacuum valve 21, and the upper end of the spring abuts against the lower side of the vacuum column 20. When the vacuum column 20 moves upward, the spring is compressed to elastically push the vacuum valve 21 downward and insert it into the vacuum column 20.

[0045] Further, after the lens 50 is placed in the bowl mold 23, a silica gel sheet 40 is covered at the opening of the bowl mold 23; specifically, the area of the silica gel sheet 40 is larger than the area of the opening of the bowl mold 23; since there is no complete seal between the edge of the lens 50 and the inner wall of the bowl mold 23 and there are gaps, when evacuating in this case, the effect of forming a negative pressure in the space below the lens 50 is not good or a negative pressure cannot be formed. By covering the silica gel sheet 40 at the opening of the bowl mold 23, when evacuating, the silica gel sheet 40 is closely attached to the opening edge of the bowl mold 23 to enhance the sealing of the space inside the bowl mold 23, thereby enhancing the effect of forming a negative pressure between the lens 50 and the bottom of the bowl mold 23, helping to bend the lens 50 and improving the yield rate.

[0046] As Figure 1 , Figure 10 shown, a heating device 13 is further provided on the top wall of the baking chamber 10. The heating device 13 includes a fan 131 and a heating wire 133. The heating wire 133 is annular, and the heating wire 133 surrounds the fan 131 for one week. The fan 131 is used to blow air at 360° to the annular heating wire 133 to disperse the heat emitted by the heating wire 133, and the fan 131 blows air at 360°, which can make the heat of the heating wire 133 disperse more evenly; specifically, the fan 131 is connected to the air blower 132, and the air blower 132 is used to drive the fan 131 to rotate. The air blower 132 is located outside the baking chamber 10, and its power output end extends into the baking chamber 10 from the top of the baking chamber 10. The heating device 13 is specifically installed on the top of the baking chamber 10. Specifically, the number of the heating wires 133 is preferably three turns, and the three turns of heating wires 133 are stacked and arranged around the fan 131. The number of the heating wires 133 can be set according to the needs of the user and is not limited herein; specifically, by combining the air blower 132, the fan 131 and the heating wire 133, the lens 50 can be uniformly heated in the baking chamber 10 inside the bending machine without preheating the lens 50 outside the bending machine, simplifying the equipment and processes.

[0047] Specifically, the bowl mold 23 of the present invention can expand the area according to the size of the lens 50 to be able to accommodate the lens 50.

[0048] Specifically, after the lens 50 is bent, it is also necessary to test the bending degree of the lens 50. The test method is as follows: Prepare mold lenses 50 with different curvatures in advance, and attach the bent lens 50 to the mold lens 50. If it is found that the edge of the lens 50 warps up after attachment, it means that the bending is insufficient and the curvature is too small; if it is found that the center bulges and forms a cavity with the mold lens 50 when the edge of the lens 50 is completely attached after attachment, it means that the bending is excessive and the curvature is too large.

[0049] The orientation terms mentioned in this specification are defined with respect to the structures shown in the respective drawings. They are relative concepts and may accordingly change depending on their different positions and usage states. Therefore, these or other orientation terms should not be construed as restrictive terms.

[0050] The above are only the preferred embodiments of the present invention and do not limit the design of this case. All equivalent changes made according to the key design of this case fall within the protection scope of this case.

Claims

1. An improved lens vacuum bending machine with controllable air extraction, characterized in that: It includes a bowl mold, a baking chamber, and an air extraction device; The bowl mold is used to place the lens; The baking chamber has a discharge port and a feed port. The lens is placed in the bowl mold outside the feed port. The baking chamber is used to continuously heat the lens. The bowl mold can enter the baking chamber from the feed port and leave the baking chamber through the discharge port; An air duct is provided between the air extraction device and the bowl mold. The air extraction device is connected to the space of the bowl mold below the lens through the air duct. After the bowl mold enters the baking chamber, the air duct can be closed first and then gradually opened. When the air duct is in the closed state, the lens can be heated and softened by the baking chamber. As the air duct is gradually opened, the air extraction rate of the air extraction device for the space of the bowl mold below the lens gradually increases, so that the negative pressure formed in the space of the bowl mold below the lens gradually increases, so that the lens is gradually bent.

2. The improved lens vacuum bending machine with controllable air extraction according to claim 1, characterized in that: It further includes a vacuum column. The bowl mold is arranged on the top side of the vacuum column. The air duct is arranged in the vacuum column. The air duct is connected to the space of the bowl mold below the lens. A vacuum valve is arranged on the vacuum column. The vacuum valve is used to open or close the air duct; The vacuum column drives the vacuum valve and the bowl mold to enter the baking chamber from the feed port and leave the baking chamber through the discharge port. The vacuum valve can close the air duct first and then gradually open the air duct after entering the baking chamber; The air extraction device is connected to the air duct. As the vacuum valve gradually opens the air duct, the air extraction rate of the air extraction device for the space of the bowl mold below the lens gradually increases, so that the negative pressure formed in the space of the bowl mold below the lens gradually increases, so that the lens is gradually bent.

3. The improved lens vacuum bending machine with controllable air extraction according to claim 2, characterized in that: The baking chamber further includes a control part. The control part is arranged along the moving path of the vacuum valve. The control part includes a first control part and a second control part. The first control part is connected to the feed port. After the vacuum valve enters the feed port, it is within the range of the first control part. The first control part is used to control the vacuum valve to close the air duct. The second control part is connected after the first control part. After the vacuum valve leaves the first control part, it immediately enters the range of the second control part. The second control part can control the vacuum valve to gradually open the air duct.

4. The improved lens vacuum bending machine with controllable air extraction according to claim 3, wherein: The vacuum column drives the vacuum valve and the bowl mold to move horizontally in the baking chamber. The vacuum valve is vertically inserted through the vacuum column and can move up and down on the vacuum column. The vacuum valve is provided with air holes and a blocking area. The blocking area is located below the air holes. The air holes are used to connect and open the air duct. The blocking area is used to block and close the air duct. When the vacuum valve moves up, the air holes can be gradually misaligned with the air duct, and the blocking area can be gradually docked with the air duct, then the air duct is gradually closed. When the vacuum valve moves down, the air holes can be gradually docked with the air duct, and the blocking area can be gradually misaligned with the air duct, then the air duct is gradually opened; The control part is a track, which is arranged along the moving path of the vacuum valve and is located below the vacuum column. The track is divided into a flush area and a descending inclined area. The flush area is the first control part. The top surface height of the flush area is the same. When the vacuum valve enters the baking chamber from the feed port, the lower end of the vacuum valve abuts against the top surface of the flush area. The flush area can abut against the vacuum valve to move upward, so that the blocking area is connected to the airway to close the airway. The descending inclined area is the second control part. The top surface height of the track in the descending inclined area gradually decreases. After the vacuum valve enters the descending inclined area from the flush area, the vacuum valve gradually moves downward, and the air hole and the airway are gradually connected, gradually increasing the area of the air hole connecting the airway, so that the airway is gradually opened, thereby gradually increasing the exhaust rate of the exhaust device, so that the lens is gradually bent due to the negative pressure.

5. The improved lens vacuum bending machine with controllable air extraction according to claim 4, characterized in that: The shape of the pore is V-shaped and extends from one end close to the blocking area to one end far from the blocking area, and continues to extend in a rectangular shape away from the blocking area at the end of the V-shaped extension. The two side walls of the V-shaped expansion of the pore are arc-shaped and bulge toward the center of the pore.

6. The improved lens vacuum bending machine with controllable air extraction according to claim 4, characterized in that: The vacuum valve comprises an elastic member, and the elastic member is used for elastically pushing the vacuum valve to move downward.

7. The improved lens vacuum bending machine with controllable air extraction according to claim 6, characterized in that: The elastic member is a spring, the lower end of the spring is fixed to the lower end of the vacuum valve, and the upper end of the spring is against the lower side of the vacuum column.

8. The improved lens vacuum bending machine with controllable air extraction according to claim 2, characterized in that: The baking chamber is a circular chamber having a notch, with the feed port and the discharge port on either side of the notch respectively. The lens is placed into the bowl mold in the notch. A turntable is provided in the baking chamber, with a closed cavity in the turntable. A plurality of vacuum columns are arranged in a circular array around the turntable, and the airways are all connected to the closed cavity. The closed cavity is connected to the exhaust device. The turntable is connected to a driving device, which is used for the turntable to rotate around its own axis, thereby driving the vacuum column to rotate around the axis of the turntable, so that the vacuum column drives the vacuum valve and the bowl mold to circulate from the feed port into the baking chamber and leave the baking chamber through the discharge port.

9. The improved lens vacuum bending machine with controllable air extraction according to claim 1, characterized in that: After the lens is placed in the bowl mold, a silicone sheet is placed on the opening of the bowl mold.

10. The improved lens vacuum bending machine with controllable air extraction according to claim 1, characterized in that: A heating device is also provided on the top wall of the baking chamber. The heating device includes a fan and a heating wire. The heating wire is annular and surrounds the fan. The fan is used to blow air 360 degrees to the annular heating wire to diffuse the heat emitted by the heating wire.

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