CN112028452A - Optical glass continuous melting furnace and method for melting optical glass with different brands by replacing optical glass - Google Patents
Optical glass continuous melting furnace and method for melting optical glass with different brands by replacing optical glass Download PDFInfo
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- CN112028452A CN112028452A CN202010723121.4A CN202010723121A CN112028452A CN 112028452 A CN112028452 A CN 112028452A CN 202010723121 A CN202010723121 A CN 202010723121A CN 112028452 A CN112028452 A CN 112028452A
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- 238000002844 melting Methods 0.000 title claims abstract description 147
- 230000008018 melting Effects 0.000 title claims abstract description 146
- 239000005304 optical glass Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000011521 glass Substances 0.000 claims abstract description 83
- 238000007599 discharging Methods 0.000 claims abstract description 68
- 238000010438 heat treatment Methods 0.000 claims abstract description 40
- 239000006060 molten glass Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000005406 washing Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims description 47
- 239000000919 ceramic Substances 0.000 claims description 12
- 229910000510 noble metal Inorganic materials 0.000 claims description 12
- 239000002893 slag Substances 0.000 claims description 12
- 239000011819 refractory material Substances 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 239000003963 antioxidant agent Substances 0.000 claims description 2
- 230000003078 antioxidant effect Effects 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims 1
- 238000007500 overflow downdraw method Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052697 platinum Inorganic materials 0.000 abstract description 3
- 238000004904 shortening Methods 0.000 abstract description 2
- 239000011449 brick Substances 0.000 description 9
- 238000004040 coloring Methods 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000010309 melting process Methods 0.000 description 4
- 239000005331 crown glasses (windows) Substances 0.000 description 3
- 239000005308 flint glass Substances 0.000 description 3
- 239000000156 glass melt Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000010970 precious metal Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000006066 glass batch Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/02—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating
- C03B5/027—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
- C03B5/0272—Pot furnaces
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/235—Heating the glass
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/235—Heating the glass
- C03B5/2356—Submerged heating, e.g. by using heat pipes, hot gas or submerged combustion burners
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Combustion & Propulsion (AREA)
- Glass Melting And Manufacturing (AREA)
Abstract
The invention discloses an optical glass continuous melting furnace and a method for melting optical glass with different brands, belonging to the technical field of optical glass manufacturing. The method mainly solves the problems that when the mark of the optical glass is frequently changed, the product quality is unqualified or the change period is overlong due to the difference of glass components. It is mainly characterized in that: the glass continuous melting furnace comprises a melting part, a non-melting part and a communicating pipe connected between the melting part and the non-melting part; the bottom of the melting part is provided with a discharging hole and a plug; a first heating device is arranged above the molten glass surface line of the melting part, a second heating device is arranged below the molten glass surface line of the melting part, and a third heating device is arranged on the side part of the discharging hole; a discharging pipe is arranged at the bottom of the non-melting part; the replacing method comprises
Discharging, washing the crucible, discharging and washing the crucible material, feeding normal materials and the like. The invention has the characteristics of obviously shortening the glass brand replacement time, improving the yield and greatly saving the cost, and is mainly used for replacing and melting optical glass with different brands in a ceramic-platinum continuous melting furnace.
Description
Technical Field
The invention belongs to the technical field of optical glass manufacturing. In particular to a ceramic platinum continuous melting furnace suitable for replacing optical glass brands and a method for melting optical glass with different brands. By adopting the method, the replacement time of the optical glass mark can be effectively shortened, and the yield and the product quality of the optical glass can be improved.
Background
The optical glass is a special glass variety, is different from common glass, and has high requirements on the glass performance. In addition to the index requirements of common glass, the optical glass also has to have special index requirements of optics, physics, chemistry, machinery and the like, and often, when one index of the optical glass does not meet the specified requirement, the optical glass product is scrapped. In addition, different from the common glass with wide application range and large market demand, the optical glass is mainly applied to an optical imaging system, and has small market demand and various varieties (brands). Therefore, the brands need to be changed frequently during the manufacture of optical glass, and generally, the whole furnace age of one furnace is switched to more than 10 brands. Frequent replacement of the glass plate causes short service life of the melting furnace, high manufacturing cost and low yield. When the glass marks are replaced, the front marks have large influence on the rear marks due to large difference between glass mark formulas, and if the operation method is not appropriate, the replacement transition period is long, a large number of products are scrapped, and the cost is ultrahigh. Therefore, the method for replacing different glass marks is particularly important.
Disclosure of Invention
The invention aims to provide an optical glass continuous melting furnace and a method for melting optical glass with different brands, which aim to solve the problems existing in the replacement of the brands of the optical glass, reduce the influence of front brands on rear brands, improve the replacement efficiency, reduce the transition period and reduce the cost.
The technical solution of the optical glass continuous melting furnace of the invention is as follows: an optical glass continuous melting furnace, characterized in that: comprises a melting part, a non-melting part and a communicating pipe connected between the melting part and the non-melting part; the bottom of the melting part is provided with a discharging hole and a plug; a first heating device is arranged above the molten glass surface line of the melting part, a second heating device is arranged below the molten glass surface line of the melting part, and a third heating device is arranged on the side part of the discharging hole; and a discharging pipe is arranged at the bottom of the non-melting part.
The bottom of the melting part in the technical scheme of the optical glass continuous melting furnace is of a V-shaped structure with high periphery and low middle part; the discharging hole is positioned at the lowest position in the middle.
The technical proposal of the optical glass continuous melting furnace is that the discharging hole is arranged at the lowest position of the center of the melting part, and the periphery of the inlet of the discharging hole is provided with a plurality of grooves in a radial shape and communicated with the discharging hole.
The aperture of the charging hole in the technical scheme of the optical glass continuous melting furnace is phi 25-35 mm.
In the technical scheme of the optical glass continuous melting furnace, one end of the communicating pipe close to the non-melting part is high, and the other end of the communicating pipe close to the melting part is low; and the communicating pipe is connected with the bottom of the non-melting part.
The technical proposal of the optical glass continuous melting furnace is that the melting part is assembled by refractory materials and comprises a feed inlet and a chimney; the non-melting part is a crucible made of noble metal, a delivery pipe is arranged at the upper part of the crucible, and a fourth heating device is arranged on the crucible.
The technical proposal of the optical glass continuous melting furnace is that the first heating device is a group of burners; the second heating device is a wall electrode made of ceramic or antioxidant precious metal; the third heating device is a ceramic or oxidation-resistant precious metal bottom electrode which is symmetrically arranged at two sides of the discharging hole, and the part of the end surface of the bottom electrode, which protrudes out of the bottom surface of the melting part, is less than 100mm and is used for heating residual glass liquid and reducing the viscosity of the glass liquid; and a burning gun is arranged below the plug. When the wall electrode is made of ceramic, the inner end surface of the electrode is flush with the inner wall surface of the refractory material, and the electrode can be assembled into an electrode wall by a plurality of electrodes side by side; when the wall electrode is made of noble metal, the inner end face of the electrode needs to protrude out of the inner wall face of the refractory material and penetrate into the molten glass. When the bottom electrode is made of ceramic, the inner end face of the electrode can be flush with or protrude out of the bottom wall face of the refractory material; when the electrode is made of noble metal, the inner end face of the electrode needs to protrude out of the bottom wall surface of the refractory material and go deep into the molten glass.
The technical solution of the invention for replacing the melting method of optical glass with different brands is as follows: a method for melting optical glass by replacing optical glass with different brands in an optical glass continuous melting furnace is characterized by comprising the following steps:
discharging:
after the front-brand glass liquid flows out of the discharging pipe at the non-melting part, keeping the first heating device to continue heating, starting the third heating device to heat, taking down the plug, after the front-brand glass liquid flows out of the discharging hole, cleaning the discharging hole, and plugging the plug;
secondly, crucible washing:
adding rear-grade glass slag into the melting part, and after melting, keeping the temperature of the rear-grade glass slag 10-50 ℃ higher than the melting temperature of the front-grade glass slag for 12-24 hours;
placing and washing crucible materials:
after the rear brand glass liquid flows out of the discharging pipe at the non-melting part, keeping the first heating device to continue heating, starting the third heating device to heat, taking down the plug, after the rear brand glass liquid flows out of the discharging hole, cleaning the discharging hole, and plugging the plug;
feeding normal materials:
and adding the normal material of the rear-grade optical glass into the melting part, and melting according to the process of the rear-grade optical glass, namely finishing the replacement of the front and rear optical glass melting.
In the first and third steps, a third heating device is started to heat, and a burning gun below a plug is started to heat while the plug is removed.
Before the fourth step, the third step and the fourth step are repeated once or twice.
The invention has the beneficial effects that:
the invention can effectively reduce the component influence when the optical glass grade is switched, thereby reducing the influence on the performance index of the optical glass, greatly shortening the time for replacing the optical glass grade, effectively improving the yield of products and reducing the product cost.
The melting part of the invention provides heat energy by using a heating mode that gas and electrodes coexist simultaneously. The gas heating provides high temperature for the space of the melting part, so as to ensure the melting of the glass slag when the electrode does not work; electrode heating provides the inside high temperature of glass liquid, promotes the quick melting of glass sediment, can obviously promote the melting efficiency of melting portion glass sediment, reduces the viscosity of glass liquid. Particularly, the use of the bottom electrode can ensure that the glass liquid at the bottom of the furnace is discharged as clean as possible and reduce the influence of grade switching.
The invention adopts the mode of discharging materials from the discharging pipe of the non-melting part and discharging materials from the discharging hole of the post-melting part, thereby avoiding the occurrence of safety accidents. Because the discharging pipe of the non-melting part has a small pipe diameter and uniform viscosity of the molten glass, the flow is small, stable and controllable during discharging. When the glass liquid in the crucible is emptied, the discharging pipe stops discharging, the glass liquid level of the melting part is shallow, the liquid level pressure is low, the wall electrode is exposed out of the glass liquid level, heating is stopped, the viscosity of the glass liquid is relatively increased, and discharging is performed in the discharging hole of the melting part at the moment, so that safety is realized.
The communicating pipe is designed to form a certain angle with the horizontal plane, is slightly lower close to the melting part and is slightly higher close to the crucible, so that the glass liquid at the non-melting part can be effectively ensured to flow back to the melting part, and thus the glass liquid is emptied in the discharge hole, the influence of the residual glass liquid at the non-melting part on the brand replacement is reduced, and the brand replacement is ensured to be thorough.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. a feed inlet; 2. wall bricks; 3. a bottom brick; 4. a bottom electrode; 5. a plug; 6. a discharge hole; 7. a wall electrode; 8. glass melt line; 9. a burner; 10. a chimney; 11. a communicating pipe; 12. a crucible; 13. discharging the material pipe; 14. a delivery pipe; 15. and (4) burning the gun.
Detailed Description
As shown in fig. 1. The invention relates to an optical glass continuous melting furnace, which comprises a melting part, a non-melting part and a communicating pipe 11 connected between the melting part and the non-melting part. The melting part is assembled by wall bricks 2, bottom bricks 3, bottom electrodes 4, wall electrodes 7 and a burner 9, the front end of the melting part is provided with a feed inlet 1, and the top of the melting part is provided with a chimney 10. A group of burners 9 are arranged in the upper space of the glass melt line 8 of the melting part, and the wall electrodes 7 are symmetrically arranged in the wall bricks 2 at the two sides of the lower part of the glass melt line 8 of the melting part. The bottom brick 3 is made of refractory materials and is assembled into a V-shaped structure with high periphery and low middle part, the lowest part is provided with a discharging hole 6, a pair of bottom electrodes 4 are arranged at two sides of the discharging hole 6, and the outlet side of the discharging hole 6 is provided with a cooling plug 5 which can be freely detached. The non-melting part is made of noble metal, the main part is a crucible 12, the bottom of the crucible 12 is provided with a discharging pipe 13, the front end of the lower part of the crucible is communicated with a communicating pipe 11, and the rear end of the upper part of the crucible is provided with a glass eduction pipe 14. The discharging pipe 13 is formed by welding noble metals, has an inner diameter of about phi 15-20 mm, and discharges materials through direct electric heating. The bottom of the rear end wall of the melting part is provided with a round hole which is connected with the communicating pipe 11. The melting part adopts a gas and electrode mixed heating mode to provide heat energy required by glass melting, and the non-melting part adopts a heat radiation mode or a direct power-on mode to heat.
The wall electrode 7 is made of ceramic or oxidation-resistant noble metal. When the wall electrode is made of ceramic, the inner end face of the wall electrode is flush with the inner wall face of the refractory material, and the wall electrode 7 can be assembled into an electrode wall by a plurality of square electrodes left and right or up and down side by side. When the glass liquid is emptied, the structure can effectively protect the ceramic electrode from cracking by utilizing the heat capacity of the brick wall and the electrode; when the wall electrode 7 is made of noble metal, the inner end face of the wall electrode 7 needs to protrude out of the inner wall face of the refractory material and penetrate into the molten glass. Because the metal material has good ductility and high strength, the problem of electrode breakage does not exist. Moreover, the structure can ensure that the heating end of the electrode is completely in the glass liquid, and can reduce the erosion of the electrode to the wall brick.
The bottom electrode 4 mainly functions to heat the residual glass liquid at the bottom, improve the temperature of the glass liquid and reduce the viscosity of the glass liquid, so that the residual glass liquid is as little as possible during discharging. The bottom electrode 4 is made of ceramic or oxidation-resistant noble metal. When the bottom electrode 4 is made of ceramic, the inner end face of the electrode can be flush with or protrude within 100mm of the bottom wall face of the refractory material; when the electrode is made of noble metal, the inner end face of the electrode needs to protrude out of the bottom wall surface of the refractory material and go deep into the molten glass.
The discharge hole 6 of the melting section is provided at the lowest position in the center of the melting section, and the diameter of the hole is preferably 25 to 35 mm. The reason is that the optical glass has a plurality of brands, the glass composition system is complex, the viscosity difference of the glass is huge, and the proper pore size is beneficial to the evacuation of various glass liquids. If the discharge aperture is designed to be too small, the emptying of the high-viscosity glass is very difficult, the discharge time is long, and the discharge efficiency is low; if the discharge aperture is designed to be too large, the discharge flow is large and can be out of control for small-viscosity glass, and high-temperature glass liquid can burn people or explode when meeting water. The periphery of the inlet of the discharging hole 6 is radially provided with a plurality of grooves communicated with the discharging hole 6, which is more beneficial to the collection of the molten glass adhered to the tank wall at the discharging hole 6.
The bottom electrodes 4 are arranged on two sides of the discharging hole 6, the maximum length of the end surfaces of the electrodes protruding out of the bottom brick surface is preferably 100mm, the molten glass at the discharging hole 6 can be heated in a centralized manner, the viscosity of the residual molten glass is reduced, and the molten glass collected at the bottom can flow out of the discharging hole 6. Meanwhile, the burning gun 15 on the outlet side of the discharging hole 6 burns all the time in the discharging process, so that the glass liquid flowing out of the discharging hole 6 is prevented from being condensed due to low temperature, the discharging hole 6 is blocked, and the glass liquid cannot be emptied.
The front end of the communicating pipe 11 is inserted into a round hole at the bottom of the rear wall of the melting part to form a platinum joint connecting device. The communicating pipe 11 is at a certain angle with the horizontal plane, is low near the melting part and is slightly higher near the crucible. The structure is beneficial to the backflow of the residual glass liquid in the non-melting part to the melting part, and the influence of the residual glass liquid is reduced.
The invention relates to a melting method for replacing optical glass with different brands, which comprises the following steps:
discharging:
the non-melting part is in a high-temperature state, the feeding pipe 13 is heated until the front-brand glass metal is discharged, and the front-brand glass metal continuously flows into a crucible of the non-melting part through the communicating pipe 11 until the front-brand glass metal cannot flow out;
keeping the flame power of the melting part burner 9 to be maximum, and electrifying the bottom electrode 4 and keeping a high current state; taking down the plug 5 at the bottom of the melting part, heating the discharging hole 6 by using the burning gun 15 until the front brand glass liquid flows out, and keeping the burning gun 15 heated until the front brand glass liquid cannot flow out; cleaning the discharging hole 6 and plugging the plug 5;
secondly, crucible washing:
keeping the flame power of a burner 9 of the melting part to be maximum, adding rear-grade glass slag from a feed inlet 1 of the melting part regularly and quantitatively until the molten glass surface line 8 reaches the upper edge of a wall electrode 7, stopping adding the glass slag, electrifying the wall electrode 7 and keeping high voltage, and waiting for the molten glass to be slowly conducted to the large current required by the process;
and continuously adding the rear-grade glass slag from a feeding port 1 of the melting part at regular time and quantity until the molten glass liquid surface line 8 reaches the liquid surface of the front-grade glass during normal production. Adjusting the power of a burner 9 and the current of a wall electrode 7 to ensure that the temperature of the glass liquid in the melting part exceeds the melting temperature of the front mark by 10-50 ℃ and is kept for 12-24 hours;
placing and washing crucible materials:
the non-melting part is in a high-temperature state, the material discharging pipe 13 is heated until crucible washing glass liquid is discharged, and the crucible washing glass liquid continuously flows into a crucible of the non-melting part through the communicating pipe 11 until the crucible washing glass liquid cannot flow out;
keeping the flame power of the melting part burner 9 to be maximum, and electrifying the bottom electrode 4 and keeping a high current state; taking down the plug 5 at the bottom of the melting part, heating the emptying hole 6 by using the burning gun 15 until the crucible-washing glass liquid flows out, and keeping the burning gun 15 heated until the crucible-washing glass liquid cannot flow out; cleaning the discharging hole 6 and plugging the plug 5;
fourthly, special crucible washing:
when the components of the front-grade glass and the rear-grade glass are very different, the glass systems of the front-grade glass and the rear-grade glass are completely different, the coloring agent is different, or the viscosity difference of glass liquid is very large, the second step and the third step are repeated, and a first crucible and a second crucible are washed;
feeding normal materials:
keeping the flame power of a burner 9 of the melting part to be maximum, adding rear-grade glass slag from a feed inlet 1 of the melting part regularly and quantitatively until the molten glass surface line 8 reaches the upper edge of a wall electrode 7, stopping adding the glass slag, electrifying the wall electrode 7 and keeping high voltage, and waiting for the molten glass to be slowly conducted to the large current required by the process;
adding the rear-brand glass batch from a feeding port 1 of the melting part regularly and quantitatively until the molten glass liquid surface line 8 reaches the liquid level required by the process; the power of the burner 9 and the current of the wall electrode 7 are adjusted to ensure that the temperature of the glass liquid in the melting part meets the melting process temperature, namely the replacement of the front and the rear optical glass melting is finished.
The present invention is described in more detail by the following examples 1 to 3, but the present invention is not limited to these examples.
Example 1:
and selecting the optical glass H-ZF 4 brand and replacing the optical glass H-ZK 14 brand as an implementation object to compare production data. The melting process temperature is the same with that of the optical glass melting furnace with the same structure and the same type, and the results of the time (hours) when the internal quality of the product meets the standard requirements are shown in the following table 1 by comparing products obtained by different brand replacement methods.
As can be seen from example 1, for the replacement of H-ZF 4 dense flint glass containing coloring ions and medium viscosity into H-ZK 14 dense crown glass without coloring ions, the method of the invention can reduce the replacement time by 216 hours and greatly improve the brand replacement efficiency.
Example 2:
and selecting the optical glass H-F4 brand and replacing the optical glass with the H-ZK 7 brand as implementation objects to compare production data. The melting process temperature is the same with that of the optical glass melting furnace with the same structure and the same type, and the results of the time (hours) when the internal quality of the product meets the standard requirements are shown in the following table 2 by comparing the products obtained by different brand replacing methods.
As can be seen from example 2, for the replacement of H-F4 dense flint glass containing coloring ions and having high viscosity into H-ZK 7 dense crown glass containing no coloring ions and having medium viscosity, the method of the invention can reduce the replacement time by 246 hours and greatly improve the brand replacement efficiency.
Example 3:
and selecting the optical glass H-QK 3L as an implementation object to be replaced by H-ZF 7L for production data comparison. The melting process temperature is the same with that of the optical glass melting furnace with the same structure and the same type, and the results of the time (hours) when the internal quality of the product meets the standard requirements are shown in the following table 3 by comparing the products obtained by different brand changing methods.
From example 3, it can be seen that, when the H-QK 3L light crown glass containing no coloring ions and having high viscosity is replaced by the H-ZF 7 heavy flint glass containing coloring ions and having low viscosity, the method of the invention can reduce the replacement time by 58 hours and obviously improve the brand replacement efficiency.
Claims (10)
1. An optical glass continuous melting furnace, characterized in that: comprises a melting part, a non-melting part and a communicating pipe (11) connected with the melting part and the non-melting part; the bottom of the melting part is provided with a discharging hole (6) and a plug (5); a first heating device is arranged above the molten glass surface line (8) of the melting part, a second heating device is arranged below the molten glass surface line, and a third heating device is arranged on the side part of the discharging hole (6); and a discharging pipe (13) is arranged at the bottom of the non-melting part.
2. An optical glass continuous melting furnace according to claim 1, characterized in that: the bottom of the melting part is of a V-shaped structure with high periphery and low middle part; the discharging hole (6) is positioned at the lowest position of the middle part.
3. An optical glass continuous melting furnace according to claim 2, characterized in that: the discharging hole (6) is arranged at the lowest position of the center of the melting part, and a plurality of grooves are radially formed on the periphery of the inlet of the discharging hole (6) and communicated with the discharging hole (6).
4. An optical glass continuous melting furnace according to claim 3, characterized in that: the aperture of the discharging hole (6) is phi 25-35 mm.
5. An optical glass continuous melting furnace according to claim 4, characterized in that: one end of the communicating pipe (11) close to the non-melting part is higher, and the other end close to the melting part is lower; and the communicating pipe (11) is connected to the bottom of the non-melting part.
6. An optical glass continuous melting furnace according to any one of claims 1 to 5, characterized in that: the melting part is assembled by adopting refractory materials and comprises a charging opening (1) and a chimney (10); the non-melting part is a crucible made of noble metal, a delivery pipe (14) is arranged at the upper part of the crucible, and a fourth heating device is arranged on the crucible.
7. An optical glass continuous melting furnace according to any one of claims 1 to 5, characterized in that: the first heating device is a group of burners (9); the second heating device is a wall electrode (7) made of ceramic or oxidation-resistant noble metal; the third heating device is a bottom electrode (4) which is symmetrically arranged at two sides of the discharging hole (6) and is made of ceramic or antioxidant noble metal, and the part of the end surface of the bottom electrode (4) protruding out of the bottom surface of the melting part is less than 100 mm; and a burning gun (15) is arranged below the plug (5).
8. A method for replacing optical glass melting of different brands by using an optical glass continuous melting furnace as claimed in any one of claims 1-5, characterized by comprising the steps of:
discharging:
after the front-brand glass liquid flows out of the non-melting part discharging pipe (13), keeping the first heating device to continue heating, starting the third heating device to heat, taking down the plug (5), after the front-brand glass liquid flows out of the discharging hole (6), cleaning the discharging hole (6), and plugging the plug (5);
secondly, crucible washing:
adding rear-grade glass slag into the melting part, and after melting, keeping the temperature of the rear-grade glass slag 10-50 ℃ higher than the melting temperature of the front-grade glass slag for 12-24 hours;
placing and washing crucible materials:
after the rear-brand glass liquid flows out of the non-melting part discharging pipe (13), keeping the first heating device to continue heating, starting the third heating device to heat, taking down the plug (5), after the rear-brand glass liquid flows out of the discharging hole (6), cleaning the discharging hole (6), and plugging the plug (5);
feeding normal materials:
and adding the normal material of the rear-grade optical glass into the melting part, and melting according to the process of the rear-grade optical glass, namely finishing the replacement of the front and rear optical glass melting.
9. The fusion-casting method for replacing optical glass with different brands as claimed in claim 8, wherein: in the first step and the third step, the third heating device is started to heat, the plug (5) is taken down, and meanwhile, the burning gun (15) below the plug (5) is started to heat.
10. The fusion method for replacing optical glass with different brands as claimed in claim 8 or 9, which is characterized in that: before the fourth step, the fourth and the third steps are repeated once or twice.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010723121.4A CN112028452A (en) | 2020-07-24 | 2020-07-24 | Optical glass continuous melting furnace and method for melting optical glass with different brands by replacing optical glass |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010723121.4A CN112028452A (en) | 2020-07-24 | 2020-07-24 | Optical glass continuous melting furnace and method for melting optical glass with different brands by replacing optical glass |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN114988668A (en) * | 2022-05-27 | 2022-09-02 | 凤阳凯盛硅材料有限公司 | Emptying process for overcoming defects of borosilicate glass |
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