CN219059205U

CN219059205U - Device for improving temperature of melt in middle of crucible in artificial crystal furnace

Info

Publication number: CN219059205U
Application number: CN202223196096.2U
Authority: CN
Inventors: 朱振业
Original assignee: Luoyang Changying New Energy Technology Co ltd
Current assignee: Luoyang Changying New Energy Technology Co ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2023-05-23
Anticipated expiration: 2032-11-16

Abstract

The utility model relates to a device for improving the temperature of melt in a crucible in an artificial crystal furnace, which relates to the field of artificial crystal material preparation, and effectively reduces the heat loss of a lower heater by arranging a heat-insulating plate which can be lifted up and down below the lower heater (9), thereby ensuring that the temperature of melt in the crucible (18) is unchanged without improving the heating power of the side heater (5) or the lower heater, further reducing the energy consumption during heating, improving the drawing efficiency of crystals, and the like.

Description

Device for improving temperature of melt in middle of crucible in artificial crystal furnace

Technical Field

The utility model relates to the field of artificial crystal material preparation, in particular to a device for improving the temperature of melt in the middle of a crucible in an artificial crystal furnace.

Background

The artificial crystal furnace is special equipment for preparing the artificial crystal material, wherein the core technology of the artificial crystal furnace is how to control the temperature gradient of the melt in a crucible, namely how to provide a proper thermal field during the preparation of the artificial crystal material, taking the crystal furnace for preparing crystalline silicon as an example, the use amount of columnar silicon rods with the diameter of 8 mm-12 mm is very large in the whole production process of multi/single crystal silicon, in the actual production process, the surplus materials occurring in the preparation process of the columnar silicon rods are found, the treatment of broken silicon rods which are carelessly broken is very complicated, the broken materials generated by multi/single crystal silicon production enterprises in the process stages of cutting, breaking and the like are very complicated, a plurality of enterprises directly discard the broken materials or stack the broken materials in a warehouse for a long time for saving trouble, and other enterprises recycle the broken materials by drawing the broken materials into the silicon rods through a Czochralski furnace, then the production cost of the columnar silicon rods with the size of Cheng Fushu pieces of 8mm or 10mm is increased in the whole production process of multi-line cutting machine, the quality is also increased in the actual production process, and the technical waste of the broken materials is also greatly reduced, and the technical resources are wasted in the field is also required to be used for the long time.

The inventor finds that the technology of pulling a silicon rod by adopting a Czochralski method is very mature and is widely applied in the field of artificial crystal preparation, but when the silicon rod is pulled by adopting the existing Czochralski method, firstly, the silicon material is placed in a crucible, then a heater is started to heat the silicon material in the crucible, at the moment, because the annular heater with the existing structure is sleeved on the periphery of the crucible, when the crucible is heated, heat is transferred from the crucible wall of the crucible to the center of the crucible, the crucible wall of the crucible is close to the heater, the central part of the crucible is far away from the heater, so that the temperature distribution of the crucible gradually decreases from the inner side wall of the crucible to the central part of the crucible (which is the technical common sense in the field), namely, the temperature is higher, the silicon material in the crucible is melted, then, the lifting mechanism arranged above the central part of the crucible drives a seed crystal to descend, and when the lower end of the seed crystal contacts with the melt in the crucible and melts into a whole, at the moment, the temperature of the melt can only follows the rising, the heating power of the heater is increased, the viscosity of the melt is increased (the temperature of the crucible is close to the crucible, and the temperature of the silicon rod is gradually pulled at the central part of the crucible is gradually, and the temperature is gradually lowered along with the rising temperature of the silicon rod, and the crystal is gradually rising temperature of the crystal is gradually, and the crystal is gradually is pulled at the temperature of the crystal in the crystal is gradually rising temperature is gradually after the silicon crystal is pulled. For example, the Chinese patent is 201320678696.4, the application date is 2013, 10, 30, the bulletin number is CN203639604U, and the patent name is a flexible shaft pulling type single crystal furnace; the utility model patent of China is 202011063763.2, the application date is 9 months and 30 days in 2020, the bulletin number is CN112176400A, and the patent name is a Czochralski single crystal furnace and a melt temperature gradient control method thereof.

Through further searching, the technical scheme that a bottom heater is added at the bottom of a crucible is provided in order to improve the phenomenon that the material in the crucible is not completely melted due to the fact that the temperature field is not uniformly distributed in the practical application of the patent, such as Chinese patent with the application number of CN201820981578.3 and the application date of 2018 and 25 months, with the publication (bulletin) number of CN208869724U and the publication (bulletin) date of 2019 and 05 and 17 months, the technical scheme that a crucible is provided in the furnace chamber, a side heater is arranged on the outer wall of the crucible, and a lower heater is fixedly arranged below the crucible, such as the technical scheme disclosed in the section [ 0030 ] of the specification, the lower heater is added, so that the silicon material at the bottom of the crucible can be sufficiently heated, melted and completely heated, and the whole temperature field is uniformly heated. "etc.

The technical schemes disclosed in the above patent are all technical schemes for drawing silicon rods by adopting a Czochralski method, but the technical schemes can only realize simultaneous drawing of one silicon rod and cannot realize simultaneous drawing of a plurality of silicon rods.

At this time, the inventor finds through analysis that, because the range of the central area of the crucible is smaller, the method can only draw one silicon rod at the same time, and can not realize the simultaneous drawing of a plurality of silicon rods, in order to realize the simultaneous drawing of a plurality of silicon rods, the drawing area of the silicon rod can only be shifted to the outer side of the central part of the crucible from the central part of the existing crucible (avoiding the central position of the crucible), the nearer to the inner wall of the crucible is, and the more the number of the silicon rods are drawn simultaneously, and through repeated experiments, the simple shifting of the drawing area of the silicon rod from the central part of the existing crucible to the outer side of the central part of the crucible mainly has the following defects when the silicon rods are drawn:

1. during drawing, the melt in the center of the crucible crystallizes with a decrease in heating power, specifically: when the silicon material is put into the crucible, the crucible is heated by the heater to melt the silicon material in the crucible, after the silicon material in the crucible is melted, the lifting mechanism drives the seed crystal to descend, when the lower end of the seed crystal contacts with the melt in the crucible and is melted into a whole, the lifting mechanism drives the seed crystal to slowly ascend, at the moment, in order to ensure that the melt can ascend along with the seed crystal, the viscosity of the melt can only be increased by reducing the heating power, when the temperature of the drawing area at the periphery of the central part of the crucible is reduced to reach the drawing requirement, the temperature of the central part of the crucible is lower than the temperature at the periphery of the central part, the heating power of the heater is reduced, the melt at the central part of the crucible is extremely easy to crystallize due to the fact that the temperature reaches the crystallization temperature, the drawing is interrupted due to the crystallization of the melt at the middle part of the crucible in severe cases, and the like.

2. In order to avoid the crystallization of the molten liquid at the central part of the crucible, the temperature of the molten liquid at the central part of the crucible can be always kept above the crystallization temperature, and the temperature of the molten liquid at the periphery of the central part of the crucible is higher than the crystallization temperature, so that the smooth drawing of the silicon rod can be ensured, the silicon rod drawing efficiency can be finally reduced only by reducing the lifting speed.

3. The temperature uniformity of the melt at the center of the crucible and the periphery of the center of the crucible cannot be realized.

4. The existing lower heater is fixedly arranged, the lower heater cannot lift along with the crucible, in the practical application process, when the crucible gradually rises and is far away from lower heating, the lower heater loses the heating effect on the crucible, and further energy consumption is increased, namely after the crucible rises to a certain height, the lower heater weakens the heating effect on the crucible, even if the lower heater lifts together with the crucible, when the lower heater rises, the heating heat of the lower heater is scattered downwards along with the continuous increase of the distance between the lower heater and the furnace bottom, at the moment, in order to ensure that the temperature of melt in the crucible is unchanged, the heating power of the side heater or the lower heater is required to be increased, and further energy consumption is increased and the like.

Therefore, it would be a long felt technical need of those skilled in the art how to provide a device for increasing the temperature of the melt in the middle of a crucible in an intraocular lens furnace.

Disclosure of Invention

In order to overcome the problems in the background art, the utility model provides a device for improving the temperature of the melt in the middle part of a crucible in an artificial crystal furnace, and the device is provided with a heat insulation plate which can be lifted up and down below a lower heater, so that the heat loss of the lower heater is effectively reduced, and the purpose that the temperature of the melt in the crucible is unchanged without improving the heating power of a side heater or the lower heater is further ensured.

In order to achieve the aim of the utility model, the utility model adopts the following technical scheme:

the utility model provides a device for improving crucible middle part melt temperature in intraocular lens stove, includes side heater, heated board, lower heater lift electrode, lower axle, crucible and side heater electrode, the crucible sets up in the furnace body, connects the lower axle below the crucible, is equipped with the side heater at the periphery of crucible, side heater connection side heater electrode is equipped with down the heater in the below of crucible, lower heater connection lower heater lift electrode is equipped with the heated board that goes up and down in the below of lower heater, the heat dissipation of heater forms under the heated board isolation crucible middle part melt temperature's device in intraocular lens stove.

The device for improving the temperature of the molten liquid in the middle of the crucible in the artificial crystal furnace is characterized in that the outer diameter of the heat insulation plate is close to the inner wall of the furnace body or a heat insulation cylinder on the inner wall of the furnace body, so that the furnace body is divided into an upper cavity and a lower cavity.

The device for improving the temperature of the molten liquid in the middle of the crucible in the artificial crystal furnace is characterized in that the crucible tray is connected with the lower surface of the crucible, and the lower end surface of the crucible tray is connected with the lower shaft.

The device for improving the temperature of the melt in the middle of the crucible in the artificial crystal furnace is characterized in that at least one layer of upper heat preservation cylinder extending downwards is arranged below the crucible tray.

The device for improving the temperature of the melt in the middle of the crucible in the artificial crystal furnace is characterized in that at least one layer of upper heat preservation cylinder extending upwards is arranged on the heat preservation plate, and the upper heater is arranged in the upper heat preservation cylinder.

The device for improving the temperature of the molten liquid in the middle of the crucible in the artificial crystal furnace is characterized in that an insulation board supporting pipe is sleeved on the outer edge surface of the lifting electrode of the lower heater, and an insulation board is arranged on the insulation board supporting pipe below the lower heater.

The device for improving the temperature of the molten liquid in the middle of the crucible in the artificial crystal furnace is characterized in that an insulating spacer is arranged between the inner edge surface of the lower end head of the heat insulation plate supporting tube and the outer edge surface of the lifting electrode of the lower heater.

The device for improving the temperature of the molten liquid in the middle part of the crucible in the artificial crystal furnace, the heat insulation plate comprises a heat insulation plate body, a cover plate and heat insulation materials, a lower shaft perforation is arranged on the heat insulation plate body, a lower heater lifting electrode perforation is arranged on the periphery of the lower shaft perforation, the cover plate is arranged at the opening end of the heat insulation plate body, and the heat insulation materials are arranged in a cavity in the heat insulation plate body.

The device for improving the temperature of the melt in the middle of the crucible in the artificial crystal furnace is characterized in that the heat-insulating plate is replaced by at least one layer of graphite plate or graphite felt or carbon composite plate, a lower shaft perforation is arranged on the heat-insulating plate, and a lower heater lifting electrode perforation is arranged on the periphery of the lower shaft perforation.

The device for improving the temperature of the molten liquid in the middle of the crucible in the artificial crystal furnace is characterized in that a side wall heat preservation layer is arranged on the inner wall of the furnace body, a heat preservation cylinder is arranged on the inner edge surface of the side wall heat preservation layer, a bottom heat preservation layer is arranged on the bottom of the furnace body, and a bottom graphite plate is arranged on the bottom heat preservation layer.

The device for improving the temperature of the melt in the middle of the crucible in the artificial crystal furnace is characterized in that the lifting electrode of the lower heater and the lower end head of the lower shaft are respectively connected with a lifting plate arranged in a lifting support below the furnace body.

The device for improving the temperature of the molten liquid in the middle part of the crucible in the artificial crystal furnace comprises a guide rail, a lifting support seat, a lifting plate, a spiral lifter and a lifting sliding block, wherein at least one guide rail is arranged on a vertical plate of the lifting support seat, the lifting sliding block is respectively arranged on each guide rail, the spiral lifter is arranged on a bottom plate of the lifting support seat, the lifter in the spiral lifter is connected with a lifting unit, the lifting unit is connected with the lifting sliding block, and the lifting plate is connected with a lower shaft and a lower end head of a lifting electrode of a lower heater.

Due to the adoption of the technical scheme, the utility model has the following beneficial effects:

according to the utility model, the heat insulation plate capable of lifting up and down is arranged below the lower heater, so that the heat dissipation of the lower heater is effectively reduced, the purpose that the temperature of the molten liquid in the crucible is unchanged while the heating power of the side heater or the lower heater is not improved is further ensured, the energy consumption during heating is further reduced, the drawing efficiency of crystals is improved, and the like.

Drawings

FIG. 1 is a schematic cross-sectional view of a front view of the structure of the present utility model;

FIG. 2 is a schematic cross-sectional view of a left-hand structure of the present utility model;

FIG. 3 is a schematic view showing a structure in which a crucible is in a raised state in the embodiment of the present utility model;

FIG. 4 is a schematic view of a lifting support according to an embodiment of the present utility model;

in the figure: 1. a bottom insulation layer; 2. a bottom graphite plate; 3. a heat preservation cylinder; 4. a side wall insulating layer; 5. a side heater; 6. a thermal insulation tray body; 7. a cover plate; 8. a thermal insulation material; 9. a lower heater; 10. a lower heater lifting electrode; 11. the heat insulation board supports the pipe; 12. an insulating spacer; 13. a lower shaft; 14. a crucible tray; 15. an upper heat preservation cylinder; 16. a lower heat preservation cylinder; 17. crucible position; 18. a crucible; 19. a side heater connection bolt; 20. a side heater electrode; 21. a lower heater connecting bolt; 22. and lifting and supporting.

Detailed Description

The present utility model will be explained in more detail by the following examples, and the purpose of the present utility model is to protect all changes and modifications within the scope of the present utility model, but the present utility model is not limited to the following examples;

in the description of the present utility model, it should be understood that the terms "center", "side", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in fig. 1 are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The device for improving the temperature of the molten liquid in the middle part of a crucible in an artificial crystal furnace is described by combining with figures 1-4, and comprises a side heater 5, a heat insulation plate, a lower heater 9, a lower heater lifting electrode 10, a lower shaft 13, a crucible 18 and a side heater electrode 20, wherein the crucible 18 is arranged in a furnace body, the inner wall of the furnace body is provided with a side wall heat insulation layer 4, the inner edge surface of the side wall heat insulation layer 4 is provided with a heat insulation cylinder 3, the bottom heat insulation layer 1 is arranged on the bottom of the furnace body, the bottom graphite plate 2 is arranged on the bottom heat insulation layer 1 of the bottom, the furnace body is arranged on a frame, lifting supports for lifting and lowering the lower heater lifting electrode 10 and lifting and rotating the lower shaft 13 are arranged in the frame, the lower shaft 13 is connected below the crucible 18, and when the device is implemented, as shown in figures 1, 2 and 3, the lower surface of the crucible 18 is connected with a crucible tray 14, the crucible top 17 is arranged on the outer edge surface of the crucible 18, and the lower end surface of the crucible tray 14 is connected with the lower shaft 13.

Further, a side heater 5 is arranged at the periphery of the crucible 18, the side heater 5 is connected with a side heater electrode 20 through a side heater connecting bolt 19, the lower end of the side heater electrode 20 passes through the bottom of the furnace body and then is connected with a power supply, and a lower heater 9 is arranged below the crucible 18, when the crucible is implemented, a lower shaft through hole is arranged on the lower heater 9, at this time, if the stability of the connection between the lower shaft 13 and the crucible tray 14 is improved, firstly, a transition connecting seat is arranged at the upper end of the lower shaft 13, the crucible tray 14 is connected through the transition connecting seat, so that the connection contact area between the lower shaft 13 and the crucible tray 14 can be increased, when the upper end of the lower shaft 13 is provided with the transition connecting seat, the diameter of the lower shaft through hole arranged on the lower heater 9 is slightly larger than the diameter of the transition connecting seat, that is positioned in the lower shaft through hole (specifically shown in fig. 1 and 2), so that the lower heater 9 is closer to the crucible 18, or when the upper end of the lower shaft 13 is provided with the transition connecting seat, the diameter of the lower shaft through hole arranged on the lower heater 9 can be also slightly larger than the diameter of the lower shaft through hole than the upper shaft 13 which can be positioned below the transition connecting seat of the crucible;

further, the lower heater 9 is connected with the lower heater lifting electrode 10 through the lower heater connecting bolt 21, the lower heater 9 is driven by the lower heater lifting electrode 10 to realize up-and-down lifting, and when the crucible 18 is lifted, the lower heater 9 can be lifted together with the lifting of the lower heater 9, so that the lower heater 9 can always heat the crucible 18, and the temperature of the molten liquid in the crucible 18 is ensured not to change due to the lifting of the crucible 18;

further, a heat insulation board which can be lifted up and down is arranged below the lower heater 9, heat dissipation of the lower heater 9 is isolated through the heat insulation board, when the heat insulation board is implemented, the lifting mode of the heat insulation board can be set to be that a heat insulation board support pipe 11 is sleeved on the outer edge surface of the lifting electrode 10 of the lower heater, the heat insulation board support pipe 11 lifts along with the lifting electrode 10 of the lower heater, a heat insulation board is arranged on the heat insulation board support pipe 11 below the lower heater 9, an insulation spacer 12 is arranged between the inner edge surface of the lower end head of the heat insulation board support pipe 11 and the outer edge surface of the lifting electrode 10 of the lower heater, and when the heat insulation board is implemented, the heat insulation spacer 12 is made of ceramics, so that the heat insulation board support pipe 11 is isolated from the lifting electrode 10 of the lower heater through the insulation spacer 12; the insulation board is driven to lift up and down through the insulation board supporting pipe 11; the lifting mode of the heat-insulating plate can also be that the lower surface of the heat-insulating plate is connected with a lifting rod, the lower end of the lifting rod penetrates through the furnace bottom to be connected with the lifting plate arranged in the lifting support 22 below the furnace body, and a sealing mechanism is arranged between the lifting rod and the furnace bottom;

further, the lower ends of the lower heater lifting electrode 10 and the lower shaft 13 are respectively connected with lifting plates arranged in the lifting support 22 below the furnace body to form a follow-up structure of the lower heater lifting electrode 10 and the lower shaft 13, or the lower ends of the lower heater lifting electrode 10 and the lower shaft 13 are respectively connected with two sets of lifting plates arranged in the lifting support 22 below the furnace body, and the two sets of lifting plates can realize follow-up, differential motion and the like.

In the implementation, the diameter of the heat-insulating plate can be slightly larger than that of the lower heater 9, the outer diameter of the lower heater 9 can be set to be close to but not contact with the inner wall of the furnace body or the heat-insulating cylinder 3 on the inner wall of the furnace body, the diameter of the lower heater 9 can be set to be smaller than that of the lower heater 9, that is to say, the heat-insulating plate which is lifted up and down is arranged below the lower heater 9, which is the key point of the protection of the utility model, in the implementation process, preferably, the outer diameter of the lower heater 9 is close to but not contact with the inner wall of the furnace body or the heat-insulating cylinder 3 on the inner wall of the furnace body, when the outer diameter of the heat-insulating plate is close to the inner wall of the furnace body or the heat-insulating cylinder 3 on the inner wall of the furnace body, the furnace body is divided into an upper cavity and a lower cavity, in the implementation, as the heights of the crucible 18 and the lower heater 9 rise, the heat-insulating plate also rises, at the moment, the distance between the heat-insulating plate and the furnace bottom is larger and larger, the cavity between the heat-insulating plate and the furnace bottom is a reactive cavity in working, namely, the temperature change of the cavity cannot influence the drawing of crystals, the cavity above the heat-insulating plate is an active cavity, the temperature field change of the cavity can influence the temperature of melt in the crucible, therefore, the cavity can be divided through the arrangement of the heat-insulating plate, and at the moment, the required temperature gradient can be ensured without increasing power due to the reduced volume of the active cavity;

further, in order to further improve the heat insulation effect, as shown in fig. 1, 2 and 3, at least one layer of upper heat insulation cylinder 15 extending downwards is arranged below the crucible tray 14, or at least one layer of lower heat insulation cylinder 16 extending upwards is arranged above the heat insulation plate, and the lower heater 9 is positioned in the lower heat insulation cylinder 16; or be equipped with the upper insulating cylinder 15 of at least one deck downwardly extending below crucible tray 14 be equipped with the lower insulating cylinder 16 of at least one deck upwardly extending above the heated board, lower heater 9 is in lower insulating cylinder 16, when setting up upper insulating cylinder 15 and lower insulating cylinder 16 simultaneously, upper insulating cylinder 15 is in the outside of lower insulating cylinder 16 or upper insulating cylinder 15 is in the inboard of lower insulating cylinder 16 can, in the concrete application, the heated board is connected to the lower extreme of lower insulating cylinder 16, the upper end of lower insulating cylinder 16 is close to crucible 18 or crucible tray 14 but can not contact crucible 18 or crucible tray 14, that is because in the course of the work, crucible 18 is rotatory for not influencing crucible 18 or crucible tray 14's rotation, the upper end of upper insulating cylinder 15 connects crucible 18 or crucible tray 14, the lower end of upper insulating cylinder 15 can not contact the heated board, in this way can guarantee 18 or tray 14 when rotatory, upper insulating cylinder 15 can not take place with the board friction, can not realize the same effect of crucible tray 14 if the implementation of upper insulating cylinder 15, can realize directly the same insulating effect of crucible tray 18.

Further, as shown in fig. 1, 2 and 3, the thermal insulation board comprises a thermal insulation tray body 6, a cover plate 7 and a thermal insulation material 8, a lower shaft perforation is arranged on the thermal insulation tray body 6, a lower heater lifting electrode perforation is arranged on the periphery of the lower shaft perforation, the cover plate 7 is arranged at the opening end of the thermal insulation tray body 6, the thermal insulation material 8 is arranged in a cavity in the thermal insulation tray body 6, and when the thermal insulation board is implemented, graphite felt, graphite, quartz cotton, zirconia, carbon-carbon composite material, alumina cotton and other materials can be selected as the thermal insulation material 8.

Further, the replacement structure of the insulation board is that the insulation board is at least one layer of graphite board or graphite felt or carbon composite board, when the graphite board or graphite felt or carbon composite board is arranged to be multi-layer, the multi-layer graphite board or graphite felt or carbon composite board is overlapped and arranged, or the insulation board can also be arranged to be a composite board of graphite board and graphite felt, or a composite board of graphite board and carbon composite board, or a composite board of graphite felt and carbon composite board, or a composite board of graphite board, graphite felt and carbon composite board is provided with lower shaft perforation on the insulation board, and lower heater lifting electrode perforation is arranged on the periphery of the lower shaft perforation.

Further, as shown in fig. 4, the lifting support 22 includes a guide rail, a lifting support base, a lifting plate, a spiral lifter and a lifting slider, at least one guide rail is disposed on the vertical plate of the lifting support base, a lifting slider is disposed on each guide rail, a spiral lifter is disposed on the bottom plate of the lifting support base, the lifter in the spiral lifter is connected with the lifting plate to form a lifting unit, the lifting unit is connected with the lifting slider, and the lifting plate is connected with the lower shaft 13 and the lower end of the lower heater lifting electrode 10.

The lifting support 22 works as a lifting nut in a spiral lifting machine, wherein the lifting nut is connected with a lifting plate through a bolt, magnetic fluid is arranged on the lifting plate, a lower shaft lifting corrugated pipe is arranged on the magnetic fluid, the upper end face of the lower shaft lifting corrugated pipe is connected with a furnace bottom, the lower end head of the lower shaft 13 passes through the magnetic fluid and is positioned below the lifting plate, a supporting plate is arranged on the magnetic fluid, two electrode lifting corrugated pipes are arranged on the supporting plate, the upper end faces of the two electrode lifting corrugated pipes are connected with the furnace bottom, two lower heater lifting electrodes 10 are respectively positioned in the electrode lifting corrugated pipes, the lower end head of the lower heater lifting electrode 10 is fixed on the supporting plate, the lower end head of the lower heater lifting electrode 10 passes through the supporting plate and is connected with an electrode joint positioned below the supporting plate, a perforation is arranged at the position corresponding to the lower shaft lifting corrugated pipe on the supporting plate, at the moment, the lower shaft lifting corrugated pipe is arranged in the perforation and can move up and down in the perforation, a first power input shaft of a fixed box body in the spiral lifter is connected with a quick lifting motor, a screw rod is driven by the quick lifting motor to rotate quickly, a second power input shaft of the fixed box body is connected with a power output shaft of a slow lifting speed reducer, the power input shaft of the slow lifting speed reducer is connected with the slow lifting motor, the screw rod is driven by the slow lifting motor to rotate slowly, an electromagnetic clutch can be arranged between the power output shaft of the slow lifting speed reducer and the second power input shaft of the fixed box body when the quick lifting motor directly drives the fixed box body, the power output shaft of the slow lifting speed reducer is disconnected from the second power input shaft of the fixed box body through the electromagnetic clutch, when the slow lifting motor works, the electromagnetic clutch is attracted, the quick lifting motor is powered off, the main shaft of the quick lifting motor is in an idle state, and no matter the quick lifting or the slow lifting is realized, because the lower heater electrode connected with the lower heater and the lower shaft connected with the crucible are simultaneously arranged on the lifting plate, when the lifting plate is lifted, the crucible 18 and the lower heater 9 are simultaneously lifted, so that the distance between the lower heater 9 and the crucible 18 is always kept unchanged, and the purpose that the temperature of the melt in the crucible is unchanged without improving the heating power of the side heater or the lower heater is realized.

It should be noted that the lifting support 22 is not an important point of the protection of the present utility model, and the present inventors have separately filed a patent on a specific structure of the lifting support 22, and meanwhile, the lifting support 22 may be any lifting support capable of realizing lifting of the crucible 18, so long as the lifting support is capable of realizing lifting of the crucible 18, and in the implementation, according to the different structures of the lifting support 22, the lower heater 9 and the heat insulation plate may move synchronously with the crucible 18, and meanwhile, the lower heater 9 and the heat insulation plate may also realize a differential motion with the crucible 18, and further adjust a distance between the crucible 18 and the lower heater 9, etc., which relates to the specific structure of the lifting support 22, and may be further detailed in the patent separately filed by the applicant.

When the utility model is embodied, when the lower shaft 13 drives the crucible 18 to rise, the lower heater 9 rises simultaneously along with the crucible 18, the distance between the crucible 18 and the lower heater 9 is not changed, when the lower heater 9 rises, the lower heater lifting electrode 10 drives the insulation board support pipe 11 to rise synchronously, at the moment, the insulation board support pipe 11 drives the insulation board to rise, the insulation board realizes the effect of preventing the heat of the lower heater 9 from being dissipated downwards, and further, the lower heater 9 is enclosed in a cavity with a relatively small volume through the arrangement of the upper insulation cylinder 15 or the lower insulation cylinder 16 or the upper insulation cylinder 15 and the lower insulation cylinder 16, the heat dissipation of the lower heater 9 to the periphery is realized while the downward dissipation of the heat of the lower heater 9 is avoided, and the like.

The above is not described in detail in the prior art.

The embodiments selected herein for the purposes of disclosing the present utility model are presently considered to be suitable, however, it is to be understood that the present utility model is intended to include all such variations and modifications as fall within the spirit and scope of the present utility model.

Claims

1. The utility model provides a device for improving crucible middle part melt temperature in intraocular lens stove, includes side heater (5), heated board, lower heater (9), lower heater lift electrode (10), lower axle (13), crucible (18) and side heater electrode (20), characterized by: the crucible (18) is arranged in the furnace body, the lower shaft (13) is connected below the crucible (18), the side heater (5) is arranged on the periphery of the crucible (18), the side heater (5) is connected with the side heater electrode (20), the lower heater (9) is arranged below the crucible (18), the lower heater (9) is connected with the lower heater lifting electrode (10), the heat insulation plate which is lifted up and down is arranged below the lower heater (9), and the device for improving the temperature of the melt in the middle of the crucible in the artificial crystal furnace is formed by isolating heat dissipation of the lower heater (9) through the heat insulation plate.

2. The apparatus for increasing the temperature of a melt in a crucible in an intraocular lens furnace according to claim 1, wherein: the outer diameter of the heat insulation plate is close to the inner wall of the furnace body or a heat insulation cylinder (3) on the inner wall of the furnace body, so that the furnace body is divided into an upper cavity and a lower cavity.

3. The apparatus for increasing the temperature of a melt in a crucible in an intraocular lens furnace according to claim 1, wherein: the lower surface of the crucible (18) is connected with a crucible tray (14), and the lower end surface of the crucible tray (14) is connected with a lower shaft (13).

4. A device for increasing the temperature of a melt in a crucible in an intraocular lens furnace according to claim 3, wherein: at least one layer of upper heat preservation cylinder (15) extending downwards is arranged below the crucible tray (14).

5. The apparatus for increasing the temperature of a melt in a crucible in an intraocular lens furnace according to claim 1, wherein: at least one layer of upper heat preservation cylinder (16) extending upwards is arranged on the heat preservation plate, and the lower heater (9) is positioned in the upper heat preservation cylinder (16).

6. The apparatus for increasing the temperature of a melt in a crucible in an intraocular lens furnace according to claim 1, wherein: the outer edge surface of the lower heater lifting electrode (10) is sleeved with an insulation board supporting pipe (11), and an insulation board is arranged on the insulation board supporting pipe (11) below the lower heater (9).

7. The apparatus for increasing the temperature of a melt in a crucible in an intraocular lens furnace according to claim 6, wherein: an insulating spacer bush (12) is arranged between the inner edge surface of the lower end head of the heat insulation board supporting pipe (11) and the outer edge surface of the lower heater lifting electrode (10).

8. The apparatus for increasing the temperature of a melt in a crucible in an intraocular lens furnace according to claim 1, wherein: the heat preservation board comprises a heat preservation tray body (6), a cover plate (7) and heat preservation materials (8), wherein a lower shaft perforation is arranged on the heat preservation tray body (6), a lower heater lifting electrode perforation is arranged on the periphery of the lower shaft perforation, the cover plate (7) is arranged at the opening end of the heat preservation tray body (6), and the heat preservation materials (8) are arranged in a cavity in the heat preservation tray body (6).

9. The apparatus for increasing the temperature of a melt in a crucible in an intraocular lens furnace according to claim 1, wherein: the heat-insulating plate is characterized in that the heat-insulating plate is at least one layer of graphite plate or graphite felt or carbon-carbon composite plate, a lower shaft perforation is arranged on the heat-insulating plate, and a lower heater lifting electrode perforation is arranged on the periphery of the lower shaft perforation.

10. The apparatus for increasing the temperature of a melt in a crucible in an intraocular lens furnace according to claim 1, wherein: the inner wall of the furnace body is provided with a side wall heat preservation layer (4), the inner edge surface of the side wall heat preservation layer (4) is provided with a heat preservation cylinder (3), the bottom heat preservation layer (1) is arranged on the bottom of the furnace body, and a bottom graphite plate (2) is arranged on the bottom heat preservation layer (1).

11. The apparatus for increasing the temperature of a melt in a crucible in an intraocular lens furnace according to claim 1, wherein: the lower heater lifting electrode (10) and the lower end of the lower shaft (13) are respectively connected with lifting plates arranged in a lifting support (22) below the furnace body.

12. The apparatus for increasing the temperature of a melt in a crucible in an intraocular lens furnace according to claim 11, wherein: the lifting support (22) comprises guide rails, a lifting support seat, a lifting plate, a spiral lifter and a lifting sliding block, wherein at least one guide rail is arranged on the vertical plate of the lifting support seat, the lifting sliding block is respectively arranged on each guide rail, the spiral lifter is arranged on the bottom plate of the lifting support seat, the lifter in the spiral lifter is connected with the lifting unit, the lifting unit is connected with the lifting sliding block, and the lifting plate is connected with the lower shaft (13) and the lower end head of the lower heater lifting electrode (10).