Mould pressing device for preparing optical glass

Abstract

The invention discloses a mold pressing device for preparing optical glass, and belongs to the technical field of glass mold pressing. The mold pressing device for optical glass preparation comprises a base table, an electric telescopic cylinder is fixedly connected to the side, close to a fixing base, of the top end of the base table, and a ventilation assembly used for injecting helium in a gas storage tank into a heating cabin is arranged in the base table. Helium is injected into the heating cabin by starting the ventilation assembly, air in the heating cabin is pumped out at the same time, the helium has the characteristic of efficient heat conductivity, rising of the temperature in the heating cabin can be accelerated, and therefore the forming efficiency of quartz stone glass is improved; after quartz stone glass is pressed and formed, the ventilation assembly is started again to achieve circulation of helium between the heating cabin and the gas storage tank, the helium can take away heat in the heating cabin in the circulation process due to the efficient heat dissipation characteristic of the helium, rapid cooling of the heating cabin is achieved, and the service life of the heating cabin is prolonged. And the helium is inert gas and cannot react with the quartz stone glass to oxidize the quartz stone glass.

Description

Technical Field

[0001] The invention relates to the technical field of glass molding, in particular to a molding device for preparing optical glass. Background Art

[0002] High-purity fused quartz glass has the characteristics of excellent spectral transmittance, extremely low thermal expansion coefficient and electrical conductivity, extremely high chemical stability, radiation resistance and long working life under extreme conditions. It is widely used in components such as gyroscopes, laser line reflectors, and semiconductor mask plates.

[0003] The Chinese patent CN115477464B published on January 23, 2024 discloses a quartz glass compression molding device and method. The composite heating system is composed of an electromagnetic heating unit and an infrared heating unit. Under the action of the composite heating system, the temperature in the heating chamber can be quickly raised to above 1500°C within 10 minutes, and the heating temperature is more uniform. Compared with the existing molding equipment, it solves the problem that the current glass compression molding equipment cannot be heated to a high temperature of 1500°C, and the heating efficiency is high. However, the quartz glass compression molding device and method need to be vacuumed during the compression molding of the quartz glass to prevent oxidation reaction after molding, but the heat dissipation efficiency in the vacuum state will be reduced. Summary of the invention

[0004] The object of the present invention is to provide a molding device for preparing optical glass to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a molding device for preparing optical glass, comprising a base, a fixing seat is fixedly connected to the top outer wall of the base, a supporting assembly for placing quartz glass is arranged on the top outer wall of the fixing seat, an electric telescopic cylinder is fixedly connected to the top of the base at a position directly above the fixing seat, an upper mold is fixedly connected to the electric telescopic cylinder on a side direction close to the fixing seat, an annular groove is provided on the top surface of the base along the outer edge of the fixing seat, a heating element adapted to the fixing seat is arranged inside the annular groove, a cylinder adapted to the heating element is arranged inside the base, the heating element slides axially along the inner wall of the base through the cylinder, a sealing cover adapted to the heating element is arranged on a side direction close to the upper mold, a plurality of groups of heating units are arranged at equal intervals in the circumferential direction of the outer periphery of the heating element, and a sealing mechanism is cooperated with the heating element to form a heating chamber, a gas storage tank is installed inside the base, and the helium inside the gas storage tank is injected into the heating chamber through a ventilation assembly.

[0006] Furthermore, the ventilation component includes an air pump located inside the base and connected to the air storage tank, an exhaust mechanism for exhausting the air inside the heating chamber and a circulation mechanism for recovering helium inside the heating chamber, an air outlet pipe adapted to the air pump is provided inside the base, a connecting pipe is provided inside the base and is connected to the air outlet pipe through the exhaust mechanism, a telescopic tube is installed on the top end of the connecting pipe on the side close to the inner wall of the heating element, an air outlet joint is installed on the side close to the inner wall of the heating element, a connecting spring adapted to the telescopic tube is provided inside the base, a ventilation groove adapted to the air outlet joint is provided inside the heating element, a valve core adapted to the ventilation groove is provided on the outer wall of the top end of the heating element, an air inlet groove adapted to the valve core is provided inside the sealing cover, and a sealing ring for connecting and sealing with the air inlet groove is provided on the outer wall of the valve core.

[0007] Furthermore, the circulation mechanism includes an exhaust groove opened on the surface of the base at the inner edge of the annular groove, an electric three-way valve adapted to the exhaust groove is arranged inside the base, an exhaust pipe adapted to the electric three-way valve is arranged inside the base, a recovery pipe is fixedly connected to the surface of the gas storage tank, the interior of the base is located between the exhaust pipe and the recovery pipe to form a cooling bin, and the two ends of the cooling bin are respectively connected to the exhaust pipe and the recovery pipe, and a plurality of groups of refrigeration plates are arranged on the inner wall of the cooling bin.

[0008] Furthermore, the exhaust mechanism includes a helium detector installed below the electric three-way valve, and a connecting groove opened on one side surface of the base and adapted to the exhaust groove, the interior of the base is located between the exhaust pipe and the connecting pipe, and is hollow to form a first empty chamber, and the two ends of the first empty chamber are respectively connected to the exhaust pipe and the connecting pipe, the interior of the base is located between the exhaust groove and the connecting groove, and is hollow to form a second empty chamber, and the two ends of the second empty chamber are respectively connected to the exhaust groove and the connecting groove, the interior of the first empty chamber is rotatably connected to a turbine, the top of the turbine is fixedly connected to a first connecting bevel gear, a first transmission bevel gear adapted to the first connecting bevel gear is provided on the inner wall of the first empty chamber, a second transmission bevel gear adapted to the first transmission bevel gear is provided on the inner wall of the second empty chamber, a second connecting bevel gear adapted to the second transmission bevel gear is provided on the inner wall of the second empty chamber, and a second connecting bevel gear adapted to the second transmission bevel gear is provided on the inner wall of the second empty chamber, and a fan is fixedly connected to the side of the second connecting bevel gear close to the direction of the connecting groove.

[0009] Furthermore, the supporting assembly includes a plurality of groups of T-slots arranged at equal intervals along the circumferential direction on the inner circumferential surface of the fixed seat, a slide groove is provided on the inner wall at the bottom end of the T-slot, a spring sheet is slidably connected inside the slide groove, a lower mold is slidably connected to the inner wall of the T-slot, and quartz glass is placed on the top surface of the lower mold.

[0010] Furthermore, the sealing mechanism includes multiple groups of iron sheets arranged along the circumferential direction on the inner circumferential surface of the top end of the heating element, and a threaded groove opened on the outer wall of the top end of the heating element. A magnet adapted to the iron sheet is arranged on one side of the sealing cover close to the heating element.

[0011] Furthermore, the sealing mechanism also includes a plurality of groups of air bins arranged in a circumferential direction along one side of the sealing cover close to the heating element, a return spring is fixedly connected to the inner wall of the air bin, a slider adapted to the air bin is arranged on one side of the return spring close to the heating element, a through groove adapted to the air bin is arranged inside the sealing cover, an air bag adapted to the threaded groove is arranged on one side of the sealing cover close to the heating element, and the air bag is connected to one end of the through groove.

[0012] The difference from the prior art lies in that the beneficial effect of the present application lies in that the molding device for preparing optical glass injects helium into the interior of the heating chamber by starting the ventilation component, and at the same time extracts the air inside the heating chamber. Due to the high thermal conductivity of helium, the temperature inside the heating chamber can be increased faster, thereby promoting the molding efficiency of the quartz glass. After the quartz glass is pressed and formed, the ventilation component is started again to realize the circulation of helium between the heating chamber and the gas storage tank. Due to the high thermal conductivity of helium, it also has excellent characteristics in heat dissipation, so that it can take away the heat inside the heating chamber during the circulation process, thereby realizing rapid cooling of the heating chamber, and helium is an inert gas and will not react with the quartz glass to cause it to oxidize. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a side view structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the iron sheet and the thread groove cooperating with each other in the present invention; Figure 3 This is a schematic diagram of the structure of the sealing cover and the magnet cooperating with each other in the present invention; Figure 4 This is a schematic diagram of the structure of the return spring and the slider cooperating with each other in the present invention; Figure 5 It is a schematic diagram of the internal structure of the present invention; Figure 6 This is a schematic diagram of the structure of the connection pipe and the recovery pipe cooperating with each other in the present invention; Figure 7 For the present invention Figure 5 The enlarged structural diagram at A in the middle; Figure 8 For the present invention Figure 5 The enlarged structural diagram at B in the middle; Fig. 9 For the present invention Figure 5 The enlarged structural diagram at C in the middle; Fig.10For the present invention Figure 5 The enlarged structural diagram at D in the middle; Fig.11 For the present invention Figure 5 Enlarged structural diagram at E in the middle.

[0014] In the figure: 1, base; 2, fixing seat; 3, T-slot; 4, slide; 5, spring sheet; 6, lower mold; 7, quartz glass; 8, electric telescopic cylinder; 9, upper mold; 10, heating element; 11, heating unit; 12, iron sheet; 13, threaded groove; 14, sealing cover; 15, magnet; 16, air chamber; 17, return spring; 18, slider; 19, through groove; 20, air bag; 21, air tank; 22, air pump; 23, air outlet pipe; 24, connecting pipe; 25, telescopic pipe; 26, air outlet joint; 27. Connecting spring; 28. Ventilation groove; 29. ​​Cylinder; 30. Valve core; 31. Sealing ring; 32. Intake groove; 33. Exhaust groove; 34. Electric three-way valve; 35. Helium detector; 36. Connecting groove; 37. Exhaust pipe; 38. Cooling bin; 39. Refrigeration plate; 40. Recovery pipe; 41. First empty bin; 42. Second empty bin; 43. Turbine; 44. First connecting bevel gear; 45. First transmission bevel gear; 46. Second transmission bevel gear; 47. Second connecting bevel gear; 48. Fan. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. Example

[0017] See also Figure 1-Figure 11The present invention provides a technical solution: a molding device for preparing optical glass, comprising a base 1, a fixing seat 2 is fixedly connected to the top outer wall of the base 1, a supporting component for placing a quartz glass 7 is arranged on the top outer wall of the fixing seat 2, an electric telescopic cylinder 8 is fixedly connected to the top of the base 1 at a position directly above the fixing seat 2, an upper mold 9 is fixedly connected to the electric telescopic cylinder 8 on one side of the fixing seat 2, an annular groove is opened on the top surface of the base 1 along the outer edge of the fixing seat 2, and a fixed The base 2 is adapted to a heating element 10, and a cylinder 29 adapted to the heating element 10 is arranged inside the base 1. The heating element 10 slides axially along the inner wall of the base 1 through the cylinder 29. A sealing cover 14 adapted to the heating element 10 is arranged on one side of the electric telescopic cylinder 8 close to the upper mold 9. A plurality of groups of heating units 11 are arranged at equal intervals in the circumferential direction of the outer periphery of the heating element 10, and a heating chamber is formed along the heating element 10 in cooperation with a sealing mechanism. A gas storage tank 21 is installed inside the base 1, and the helium inside the gas storage tank 21 is injected into the heating chamber through a ventilation component.

[0018] When in use, firstly, the quartz glass 7 is placed on the surface of the fixing seat 2 through the supporting assembly, and then the cylinder 29 is started to push the heating element 10 to move upward and close it with the sealing cover 14 to form a heating chamber, and then the ventilation assembly is started to inject helium into the interior of the heating chamber, and the air inside the heating chamber is extracted at the same time, and then the heating unit 11 is started to heat the interior of the heating chamber, and the electric telescopic cylinder 8 is started to push the upper mold 9 downward. Due to the high thermal conductivity of helium, the temperature inside the heating chamber can be increased quickly, thereby promoting the molding efficiency of the quartz glass 7. After the quartz glass 7 is pressed and formed, the ventilation assembly is started again to realize the circulation of helium between the heating chamber and the gas storage tank 21. Due to the high thermal conductivity of helium, it also has excellent characteristics in heat dissipation, so that it can take away the heat inside the heating chamber during the circulation process, thereby realizing rapid cooling of the heating chamber, and helium is an inert gas and will not react with the quartz glass 7 to oxidize it.

[0019] See also Figure 5 , Figure 8 and Fig. 9As shown in the figure, the ventilation component includes an air pump 22 located inside the base 1 and connected to the air storage tank 21, an exhaust mechanism for exhausting the air inside the heating chamber and a circulation mechanism for recovering helium inside the heating chamber, an outlet pipe 23 adapted to the air pump 22 is arranged inside the base 1, a connecting pipe 24 is arranged inside the base 1, and is connected to the outlet pipe 23 through the exhaust mechanism, a telescopic tube 25 is installed on the top of the connecting pipe 24 on one side close to the inner wall of the heating element 10, an outlet joint 26 is installed on the side close to the inner wall of the heating element 10, a connecting spring 27 adapted to the telescopic tube 25 is arranged inside the base 1, a ventilation groove 28 adapted to the outlet joint 26 is arranged inside the heating element 10, a valve core 30 adapted to the ventilation groove 28 is arranged on the outer wall of the top end of the heating element 10, an air inlet groove 32 adapted to the valve core 30 is arranged inside the sealing cover 14, and a sealing ring 31 for connecting and sealing with the air inlet groove 32 is arranged on the outer wall of the valve core 30.

[0020] When in use, when the heating element 10 moves upward and closes with the sealing cover 14 to form a heating chamber, the valve core 30 at the top of the heating element 10 will be inserted into the inside of the air inlet groove 32 on the surface of the sealing cover 14, and the sealing ring 31 on the surface of the valve core 30 ensures the sealing of the connection between the valve core 30 and the air inlet groove 32. At the same time, the connecting spring 27 is forced to push the telescopic tube 25 to extend outward, thereby pushing the air outlet connector 26 out of the base 1, so that one end of the air outlet connector 26 is engaged with one end of the air vent 28, and then connected to the outside The power supply starts the air pump 22 to pump the helium in the gas storage tank 21 into the connecting pipe 24 through the outlet pipe 23. The helium then enters the ventilation groove 28 through the outlet joint 26 and enters the heating chamber from the inlet groove 32. Since the density of helium is lower than that of air, the helium will float above the heating chamber after entering the heating chamber. As the helium content gradually increases, it will press the air below and discharge it into the heating chamber through the exhaust groove 33 and the connecting groove 36, so that the helium can completely fill the heating chamber.

[0021] See also Figure 5 , Figure 6 and Fig.10 As shown in the figure, the circulation mechanism includes an exhaust groove 33 opened on the surface of the base 1 at the inner edge of the annular groove, an electric three-way valve 34 adapted to the exhaust groove 33 is arranged inside the base 1, an exhaust pipe 37 adapted to the electric three-way valve 34 is arranged inside the base 1, a recovery pipe 40 is fixedly connected to the surface of the gas storage tank 21, a cooling bin 38 is formed in the hollow between the exhaust pipe 37 and the recovery pipe 40 inside the base 1, and the two ends of the cooling bin 38 are respectively connected to the exhaust pipe 37 and the recovery pipe 40, and a plurality of groups of refrigeration plates 39 are arranged on the inner wall of the cooling bin 38.

[0022] When in use, the electric three-way valve 34 is started to open the connection between the exhaust groove 33 and the exhaust pipe 37, and the pipeline from the exhaust groove 33 to the helium detector 35 is closed. Then, the air pump 22 is started to inject new helium into the heating chamber, and the original heated helium in the heating chamber is squeezed into the exhaust groove 33. The helium at this time is guided to the exhaust pipe 37 through the electric three-way valve 34 and enters the cooling chamber 38. At the same time, the external power supply is connected to start the refrigeration plate 39 to cool the helium entering the cooling chamber 38. The cooled helium returns to the gas storage tank 21 through the recovery pipe 40. In this cycle, the helium newly injected into the heating chamber will continuously take away the heat inside the heating chamber during the process of entering the exhaust groove 33 and returning to the gas storage tank 21, thereby achieving a rapid cooling effect.

[0023] See also Figure 5 , Fig.10 and Fig.11 As shown in the figure, the exhaust mechanism includes a helium detector 35 installed below the electric three-way valve 34, and a connecting groove 36 opened on one side surface of the base 1 and adapted to the exhaust groove 33. The interior of the base 1 is located between the outlet pipe 23 and the connecting pipe 24 to form a first empty chamber 41, and the two ends of the first empty chamber 41 are respectively connected to the outlet pipe 23 and the connecting pipe 24. The interior of the base 1 is located between the exhaust groove 33 and the connecting groove 36 to form a second empty chamber 42, and the two ends of the second empty chamber 42 are respectively connected to the exhaust groove 33 and the connecting groove 36. Then, the first empty chamber 41 is internally rotatably connected to a turbine 43, the top of the turbine 43 is fixedly connected to a first connecting bevel gear 44, a first transmission bevel gear 45 adapted to the first connecting bevel gear 44 is provided on the inner wall of the first empty chamber 41, a second transmission bevel gear 46 adapted to the first transmission bevel gear 45 is provided on the inner wall of the second empty chamber 42, a second connecting bevel gear 47 adapted to the second transmission bevel gear 46 is provided on the inner wall of the second empty chamber 42, and a fan 48 is fixedly connected to the side of the second connecting bevel gear 47 close to the connecting groove 36.

[0024] When in use, when helium is injected into the interior of the heating chamber, the helium enters the interior of the first empty chamber 41 through the air outlet pipe 23, blows the turbine 43 to drive the first connecting bevel gear 44 to rotate, and through the meshing of the first connecting bevel gear 44 and the first transmission bevel gear 45, drives the first transmission bevel gear 45 and the second transmission bevel gear 46 to rotate, and through the meshing of the second transmission bevel gear 46 and the second connecting bevel gear 47, the turbine 43 can drive the fan 48 to rotate synchronously when rotating, so that the air inside the second empty chamber 42 is discharged to the outside air through the connecting groove 36, so that the air pressure inside the second empty chamber 42 is reduced, so that the air inside the heating chamber enters the second empty chamber 42 through the second empty chamber 42. In the empty chamber 42, when the helium detector 35 detects that the helium content in the air entering the exhaust groove 33 reaches a critical value, the electric three-way valve 34 will be started to close the exhaust groove 33 to prevent the helium from continuing to be discharged. The trace amount of helium discharged is not enough to cause harm to the human body. When air is re-injected into the interior of the heating chamber, the electric three-way valve 34 is started to open the exhaust groove 33 and close the connection between the exhaust groove 33 and the exhaust pipe 37, and then the air pump 22 is started to evacuate the air, so that the helium inside the heating chamber returns to the interior of the gas storage tank 21 along the original route. At this time, the air pressure inside the heating chamber is reduced, which will generate a suction force to the outside, and the external air is sucked into the interior of the heating chamber through the connecting groove 36 and the exhaust groove 33.

[0025] See also Figure 7 As shown in the figure, the supporting assembly includes a plurality of groups of T-slots 3 arranged at equal intervals along the circumferential direction on the inner circumferential surface of the fixed seat 2, a slide groove 4 is opened on the inner wall of the bottom end of the T-slot 3, a spring sheet 5 is slidably connected inside the slide groove 4, a lower mold 6 is slidably connected to the inner wall of the T-slot 3, and a quartz glass 7 is placed on the top surface of the lower mold 6.

[0026] When in use, first insert multiple groups of lower molds 6 into the interior of each group of T-slots 3 respectively, then put the quartz glass 7 on the surface of the lower mold 6, and then start the electric telescopic cylinder 8 to push the upper mold 9 to move downward. Because the shapes of the multiple groups of quartz glass 7 may be different, it is difficult for the upper mold 9 to press each group of quartz glass 7 at the same time. At this time, the quartz glass 7 that contacts the upper mold 9 before the upper mold 9 is pressed down by the force, so that the lower mold 6 presses the spring sheet 5, so that the two ends of the spring sheet 5 slide inside the slide groove 4 and deform, thereby ensuring that the upper mold 9 can cover the surfaces of multiple groups of quartz glass 7 at the same time when pre-pressing the quartz glass 7.

[0027] See also Figure 1-Figure 3 As shown in the figure, the sealing mechanism includes a plurality of groups of iron sheets 12 arranged along the circumferential direction on the inner circumferential surface of the top end of the heating element 10, and a threaded groove 13 opened on the outer wall of the top end of the heating element 10. A magnet 15 adapted to the iron sheet 12 is arranged on one side of the sealing cover 14 close to the heating element 10.

[0028] When in use, when the cylinder 29 pushes the heating element 10 to move upward and close with the sealing cover 14, the magnet 15 on the surface of the sealing cover 14 will adsorb the iron sheet 12 on the surface of the heating element 10, thereby ensuring the stability of the sealing cover 14 and the heating element 10 after being connected.

[0029] See also Figure 3-Figure 4 As shown in the figure, the sealing mechanism also includes a plurality of groups of air bins 16 arranged in a circumferential direction along one side of the sealing cover 14 close to the heating element 10, a return spring 17 is fixedly connected to the inner wall of the air bin 16, a slider 18 adapted to the air bin 16 is arranged on one side of the return spring 17 close to the heating element 10, a through groove 19 adapted to the air bin 16 is arranged inside the sealing cover 14, an air bag 20 adapted to the threaded groove 13 is arranged on one side of the sealing cover 14 close to the heating element 10, and the air bag 20 is connected to one end of the through groove 19.

[0030] During use, when the cover 14 and the heating element 10 are closed, the slider 18 will be squeezed to slide toward the inside of the air bin 16 and the return spring 17 will be contracted. When the slider 18 slides toward the inside of the air bin 16, it will squeeze the internal air of the air bin 16, so that the air inside the air bin 16 enters the inside of the air bag 20 through the through groove 19. The air bag 20 inflates and expands outward and fits with the threaded groove 13, thereby ensuring the sealing of the cover 14 and the heating element 10 after closing.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A molding device for preparing optical glass, comprising a base (1), characterized in that: A fixing seat (2) is fixedly connected to the top outer wall of the base (1), a supporting assembly for placing quartz glass (7) is arranged on the top outer wall of the fixing seat (2), an electric telescopic cylinder (8) is fixedly connected to the top of the base (1) at a position directly above the fixing seat (2), an upper mold (9) is fixedly connected to the electric telescopic cylinder (8) on one side close to the fixing seat (2), an annular groove is provided on the top surface of the base (1) along the outer edge of the fixing seat (2), a heating element (10) adapted to the fixing seat (2) is arranged inside the annular groove, and the base (1) A cylinder (29) adapted for the heating element (10) is arranged inside the base (1), and the heating element (10) slides axially along the inner wall of the base (1) through the cylinder (29); a sealing cover (14) adapted for the heating element (10) is arranged on one side of the electric telescopic cylinder (8) close to the upper mold (9); a plurality of groups of heating units (11) are arranged at equal intervals in the circumferential direction of the outer periphery of the heating element (10), and cooperate with the sealing mechanism to form a heating chamber along the heating element (10); a gas storage tank (21) is installed inside the base (1), and the helium inside the gas storage tank (21) is injected into the heating chamber through the ventilation component.

2. A molding device for preparing optical glass according to claim 1, characterized in that: The ventilation assembly comprises an air pump (22) located inside the base (1) and connected to the air storage tank (21), an exhaust mechanism for exhausting the air inside the heating chamber, and a circulation mechanism for recovering the helium inside the heating chamber. An air outlet pipe (23) adapted to the air pump (22) is arranged inside the base (1). A connecting pipe (24) is arranged inside the base (1) and connected to the air outlet pipe (23) via the exhaust mechanism. A telescopic pipe (25) is installed on one side of the top end of the connecting pipe (24) close to the inner wall of the heating element (10). The telescopic pipe (25) is close to the heating element (10). An air outlet joint (26) is installed on one side of the inner wall of the heating element (10), a connecting spring (27) adapted to the telescopic tube (25) is arranged inside the base (1), a ventilation groove (28) adapted to the air outlet joint (26) is arranged inside the heating element (10), a valve core (30) adapted to the ventilation groove (28) is arranged on the top outer wall of the heating element (10), an air inlet groove (32) adapted to the valve core (30) is arranged inside the sealing cover (14), and a sealing ring (31) for connecting and sealing with the air inlet groove (32) is arranged on the outer wall of the valve core (30).

3. A molding device for preparing optical glass according to claim 2, characterized in that: The circulation mechanism comprises an exhaust groove (33) provided on the surface of the base (1) and located at the inner edge of the annular groove; an electric three-way valve (34) adapted to the exhaust groove (33) is arranged inside the base (1); an exhaust pipe (37) adapted to the electric three-way valve (34) is arranged inside the base (1); a recovery pipe (40) is fixedly connected to the surface of the gas storage tank (21); a cooling chamber (38) is formed in the hollow space between the exhaust pipe (37) and the recovery pipe (40) inside the base (1), and two ends of the cooling chamber (38) are respectively connected to the exhaust pipe (37) and the recovery pipe (40); and a plurality of groups of refrigeration fins (39) are arranged on the inner wall of the cooling chamber (38).

4. The molding device for preparing optical glass according to claim 2, characterized in that: The exhaust mechanism comprises a helium detector (35) installed below the electric three-way valve (34), and a connecting groove (36) provided on a side surface of the base (1) and adapted to the exhaust groove (33); the interior of the base (1) is located between the exhaust pipe (23) and the connecting pipe (24) to form a first empty chamber (41), and the two ends of the first empty chamber (41) are respectively connected to the exhaust pipe (23) and the connecting pipe (24); the interior of the base (1) is located between the exhaust groove (33) and the connecting groove (36) to form a second empty chamber (42), and the two ends of the second empty chamber (42) are respectively connected to the exhaust groove (33) and the connecting groove (36). The first empty chamber (41) is internally rotatably connected to a turbine (43), the top end of the turbine (43) is fixedly connected to a first connecting bevel gear (44), the inner wall of the first empty chamber (41) is provided with a first transmission bevel gear (45) adapted to the first connecting bevel gear (44), the inner wall of the second empty chamber (42) is provided with a second transmission bevel gear (46) adapted to the first transmission bevel gear (45), the inner wall of the second empty chamber (42) is provided with a second connecting bevel gear (47) adapted to the second transmission bevel gear (46), and the second connecting bevel gear (47) is fixedly connected to a fan (48) on one side of the second connecting bevel gear (47) close to the connecting groove (36).

5. The molding device for preparing optical glass according to claim 1, characterized in that: The supporting assembly comprises a plurality of groups of T-shaped grooves (3) arranged at equal intervals in a circumferential direction along the inner circumferential surface of the fixing seat (2); a slide groove (4) is provided on the inner wall at the bottom end of the T-shaped groove (3); a spring sheet (5) is slidably connected inside the slide groove (4); a lower mold (6) is slidably connected to the inner wall of the T-shaped groove (3); and a quartz glass (7) is placed on the top surface of the lower mold (6).

6. The molding device for preparing optical glass according to claim 1, characterized in that: The sealing mechanism comprises a plurality of groups of iron sheets (12) arranged in a circumferential direction on the inner circumferential surface of the top end of the heating element (10), and a threaded groove (13) provided on the outer wall of the top end of the heating element (10); and a magnet (15) adapted to the iron sheet (12) is arranged on one side of the sealing cover (14) close to the heating element (10).

7. A molding device for preparing optical glass according to claim 6, characterized in that: The sealing mechanism further comprises a plurality of groups of air bins (16) arranged in a circumferential direction along a side direction of the sealing cover (14) close to the heating element (10); a return spring (17) is fixedly connected to the inner wall of the air bin (16); a slider (18) adapted to the air bin (16) is arranged on a side direction of the return spring (17) close to the heating element (10); a through groove (19) adapted to the air bin (16) is arranged inside the sealing cover (14); an air bag (20) adapted to the threaded groove (13) is arranged on a side direction of the sealing cover (14) close to the heating element (10); and the air bag (20) is connected to one end of the through groove (19).

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