CN113636747A - Glass heating furnace and glass heating method - Google Patents
Glass heating furnace and glass heating method Download PDFInfo
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- CN113636747A CN113636747A CN202111072729.6A CN202111072729A CN113636747A CN 113636747 A CN113636747 A CN 113636747A CN 202111072729 A CN202111072729 A CN 202111072729A CN 113636747 A CN113636747 A CN 113636747A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B29/00—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
Abstract
The invention relates to a glass heating furnace and a glass heating method. Compared with the prior art, the upper convection heating element of the glass heating furnace can be lifted under the control of the convection heating lifting system, so that the blowing distance between the upper convection heating element and the surface of the glass can be adjusted according to the difference of glass products and the difference of process requirements, and when the common glass is heated, the temperature difference between the surface temperature of the common glass when the common glass enters the furnace and the hot air in the heating furnace can be reduced by adjusting the distance between the upper convection heating element and the surface of the glass, so that the defects of edge warping and surface scalding of the common glass are avoided.
Description
The technical field is as follows:
the invention relates to the technical field of glass heating, in particular to a glass heating furnace and a glass heating method.
Background art:
glass used in the building and automobile industries is generally bent glass with various curvatures, the bent glass is obtained by heating and softening flat glass and then bending and forming, and a heating furnace is used for heating the glass in the production process so as to heat the glass from normal temperature to the softening temperature. The specific steps of the traditional heating furnace for heating the glass are as follows: and conveying the glass from the inlet to the outlet of the heating furnace by using a conveying device, and carrying out radiant heating on the glass by using heating furnace wires in the furnace body of the heating furnace in the conveying process so as to gradually raise the temperature of the glass to the softening temperature. The conventional heating furnace which only utilizes the radiation heating of the furnace wire can only be used for heating common glass; in addition, one or more layers of metal, metal alloy and metal oxide thin layers are deposited on the surface of the coated glass, so that the functions of heat insulation, electric heating and the like are achieved, and the metal thin layers, the metal alloy thin layers and the metal oxide thin layers have reflection effects on heat radiation, so that the traditional heating furnace has long heating time and poor heating effect on the coated glass, and the heating requirements of the coated glass in actual production cannot be met. In addition, a heating furnace using hot air convection technology is also used in the prior art, and hot air in the furnace body is sucked and then sprayed to the surface of the glass again, so that the heat exchange efficiency between the surface of the glass and the hot air is improved. However, when the heating furnace heats the ordinary glass, the temperature difference between the surface temperature of the ordinary glass when the ordinary glass enters the furnace and the hot air is too large, which easily causes the edge of the ordinary glass to warp and even causes the surface scald defect.
With the increasing demand for the product performance of the coated glass, the number of metal thin layers, metal alloy thin layers and/or metal oxide thin layers in the coated glass is also increasing, for example, double-silver coated glass (including two metal silver layers), triple-silver coated glass (including three metal silver layers), four-silver coated glass (including four metal silver layers), and the like, it is difficult for the heating furnace in the prior art to reduce the temperature difference between the surface temperature and the surface temperature of the coated glass.
The invention content is as follows:
the present invention is to overcome the above-mentioned drawbacks, and aims to provide a glass heating furnace and a glass heating method capable of reducing the temperature difference between the surface temperature of ordinary glass and hot air when the glass enters the furnace and reducing the temperature difference between the two surfaces of coated glass.
In order to achieve the purpose, the invention adopts the following technical scheme:
a glass heating furnace comprises a furnace body and a transmission device, wherein the furnace body is provided with an inlet end, an outlet end, a furnace body top and a furnace body bottom, the conveying device is positioned between the top of the furnace body and the bottom of the furnace body and is used for conveying the glass from the inlet end to the outlet end, an upper radiation heating element and an upper convection heating element are arranged between the conveying device and the top of the furnace body, the upper convection heating element is located between the transport and the upper radiant heating element, the upper radiant heating element is used for carrying out radiant heating on the upper surface of the glass, the upper convection heating element is used for carrying out convection heating on the upper surface of the glass, a lower radiation heating element is arranged between the transmission device and the bottom of the furnace body and used for carrying out radiation heating on the lower surface of the glass;
the heating furnace also comprises a convection heating lifting system, the convection heating lifting system is used for controlling the upper convection heating element to vertically lift between the conveying device and the upper radiation heating element, and the difference between the temperature of the upper surface and the temperature of the lower surface of the glass at the outlet end is smaller than or equal to a set temperature difference value.
Compared with the prior art, the upper convection heating element of the glass heating furnace can be lifted under the control of the convection heating lifting system, so that the blowing distance between the upper convection heating element and the surface of the glass can be adjusted according to the difference of glass products and the difference of process requirements, and when the common glass is heated, the temperature difference between the surface temperature of the common glass when entering the furnace and the hot air in the heating furnace can be reduced by adjusting the distance between the upper convection heating element and the surface of the glass, so that the defects of edge warping and surface scalding of the common glass are avoided; for the coated glass, the glass heating furnace can also adjust the position of the upper convection heating element according to the size of the glass and the surface coating condition, so that the temperature difference between the two surfaces of the coated glass can be reduced; and for complex multilayer coated glass, the distance between the upper convection heating element and the glass surface can be changed to solve the problem of difficult heating of the multilayer coated glass.
A glass heating method for heating glass by using the glass heating furnace comprises the following steps:
the method comprises the following steps of firstly, acquiring a set temperature difference between the upper surface temperature and the lower surface temperature of glass at an outlet end;
secondly, controlling a preset distance between an upper convection heating element and the upper surface of the glass through a convection heating lifting system according to the set temperature difference;
placing at least one piece of glass on a conveying device, conveying the glass from an inlet end to an outlet end of a furnace body by the conveying device, carrying out radiant heating on the upper surface of the glass by an upper radiant heating element, carrying out convection heating on the upper surface of the glass by an upper convection heating element, and carrying out radiant heating on the lower surface of the glass by a lower radiant heating element;
measuring the upper surface temperature and the lower surface temperature of the glass at the outlet end to obtain the actual temperature difference between the upper surface temperature and the lower surface temperature;
step five, if the actual temperature difference is larger than the set temperature difference, adjusting the preset distance in the step two, and repeating the step three and the step four until the actual temperature difference is smaller than or equal to the set temperature difference;
if the actual temperature difference is less than or equal to the set temperature difference, the distance between the upper convection heating element and the upper surface of the glass is the set distance;
and step six, heating the glass according to the set distance in the step 5, and enabling the temperature of the upper surface and the temperature of the lower surface of the glass conveyed to the outlet end to be both greater than 500 ℃.
Compared with the prior art, the glass heating method can control the surface temperature in the glass heating process by adjusting the distance between the convection heating element and the glass surface, thereby ensuring that the actual temperature difference of the two surfaces of the glass can be lower than or equal to the set temperature difference.
Description of the drawings:
FIG. 1 is a schematic view showing the overall structure of a glass heating furnace according to the present invention;
FIG. 2 is a front view of a glass heating furnace according to the present invention;
FIG. 3 is a schematic view showing a front windshield placed on the lower furnace body;
FIG. 4 is a schematic structural view of a convection heating lift system;
FIG. 5 is a schematic view of a second zone within the furnace body;
FIG. 6 is a schematic view of the structure of the upper convection heating element in the first zone of the furnace interior;
fig. 7 is a schematic view of the structure of the upper convection heating element in the second zone inside the furnace body.
Description of reference numerals:
1. a furnace body; 11. an inlet end; 12. an outlet end; 13. an upper furnace body; 14. a lower furnace body; 2. a transmission device; 3. an upper radiant heating element; 4. an upper convection heating element; 41. an upper preheating pipeline; 42. an upper exhaust line; 5. a lower radiant heating element; 6. a lower convection heating element; 61. a lower preheating pipeline; 62. a lower exhaust line; 7. a convection heating lift system; 71. lifting the frame; 711. a lifting bar; 712. an upper frame; 713. a lower frame; 714. a fixed seat; 72. a power-lifting motor; 73. lifting the spiral lifter; 731. a screw; 74. a transmission assembly; 741. a power shaft; 742. a power steering gear; 8. an upper gas control system; 81. an upper air intake line; 82. an upper valve body; 9. a lower gas control system; 91. a lower air inlet pipeline; 92. and a lower valve body.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the glass heating furnace according to the present invention comprises a furnace body 1 and a conveying device 2, wherein the furnace body 1 has an inlet end 11, an outlet end 12, a top of the furnace body 1 and a bottom of the furnace body 1, the furnace body 1 is divided into an upper furnace body 13 and a lower furnace body 14, the top of the furnace body 1 is located at the top of the upper furnace body 13, the bottom of the furnace body 1 is located at the bottom of the lower furnace body 14, and the inlet end 11 and the outlet end 12 are located between the upper furnace body 13 and the lower furnace body 14;
as shown in fig. 3, the conveying device 2 is located between the top of the furnace body 1 and the bottom of the furnace body 1, and the conveying device 2 is used for conveying glass from the inlet end 11 to the outlet end 12, wherein the conveying device may be specifically a ceramic conveying roller, or a conveying ring, etc.;
as shown in fig. 1, an upper radiation heating element 3 and an upper convection heating element 4 are provided between the transfer device 2 and the top of the furnace body 1, the upper convection heating element 4 is located between the conveyor 2 and the upper radiant heating element 3, the upper radiant heating element 3 is used for radiant heating of the upper surface of the glass, the upper convection heating element 4 is used for convection heating of the upper surface of the glass, a lower radiation heating element 5 is arranged between the conveying device 2 and the bottom of the furnace body 1, the lower radiation heating element 5 is used for heating the lower surface of the glass in a radiation way, wherein, the upper radiation heating element 3 can be a heating wire, a ceramic heating pipe, a heating rod or the like, and the lower radiation heating element 5 can be a heating wire, a ceramic heating pipe, a heating rod or the like;
as shown in fig. 1 and 2, the heating furnace further includes a convection heating and lifting system 7, the convection heating and lifting system 7 is configured to control the upper convection heating element 4 to vertically lift between the conveying device 2 and the upper radiation heating element 3, a difference between an upper surface temperature and a lower surface temperature of the glass at the outlet end 12 is less than or equal to a set temperature difference value, and a value range of the set temperature difference value is 0 to 5 ℃. In a specific embodiment, when a glass heating furnace is used for heating common glass, the temperature difference between the upper surface and the lower surface of the glass heating furnace is required to be within the range of 0-1 ℃, namely, the set temperature difference value is 1 ℃; in another embodiment, the single-layer coated glass is heated by a glass heating furnace, the temperature difference between the upper surface and the lower surface is required to be within the range of 0-2 ℃, namely, the set temperature difference value is 2 ℃; in another embodiment, when a glass heating furnace is used to heat double-layer coated glass or double-layer or more coated glass, the temperature difference between the upper surface and the lower surface is required to be in the range of 0 to 5 ℃, i.e. the set temperature difference is 5 ℃.
Further, a lower convection heating element 6 is further provided between the conveyor 2 and the lower radiant heating element 5, the lower convection heating element 6 is used for convection heating of the lower surface of the glass, and the heating furnace further comprises a gas control system for supplying compressed air to the upper convection heating element 4 and the lower convection heating element 6.
As can be seen from the above description, the upper convection heating element 4 and the lower convection heating element 6 are heated by the upper radiation heating element 3 and the lower radiation heating element 5, respectively, in the furnace body 1, and the gas control system controls the ratio of the compressed gas to the heated upper convection heating element 4 and the heated lower convection heating element 6, so that the compressed gas is heated to be approximately consistent with the temperature in the furnace body 1 during the flowing process of the compressed gas in the upper convection heating element 4 and the lower convection heating element 6, and then is sprayed onto the glass surface for heating. And the glass to be heated is conveyed forwards under the action of the conveying device 2 after entering the furnace body 1, and meanwhile, the upper convection heating element 4 is vertically lifted under the control of the convection heating lifting system 7, so that the upper convection heating element 4 and the surface of the glass are positioned at a proper heating distance according to the product characteristics of the glass to be heated. In addition, each or each group of upper convection heating elements 4 can be independently controlled by the convection heating lifting system 7, and the compressed gas in each or each group of upper convection heating elements 4 and lower convection heating elements 6 can also be independently controlled by the gas control system, so that each upper convection heating element 4 can work along with the movement of the glass, and the difference between the upper surface temperature and the lower surface temperature of the glass at the outlet end 12 is smaller than or equal to the set temperature difference value.
Specifically, as shown in fig. 4, the furnace further includes a gas control system, the gas control system includes an upper gas control system 8 and a lower gas control system 9, the top of the upper furnace 13 is provided with the upper gas control system 8 for introducing compressed gas into the upper convection heating element 4, the upper gas control system 8 includes an upper gas inlet pipeline 81 and an upper valve body 82 arranged on the upper gas inlet pipeline 81, the upper gas inlet pipeline 81 is communicated with the upper convection heating element 4 through the upper valve body 82, one upper valve body 82 can be simultaneously communicated with the plurality of upper convection heating elements 4 through one pipe for shunting, meanwhile, the situation that one upper valve body 82 is connected with one upper convection heating element 4 is not excluded, and the upper valve body 82 is specifically a proportional valve. As shown in fig. 3, a lower gas control system 9 for introducing compressed gas into the lower convection heating element 6 is disposed at the bottom of the lower furnace body 14, the lower gas control system 9 includes a lower gas inlet pipeline 91 and a lower valve body 92 disposed on the lower gas inlet pipeline 91, the lower gas inlet pipeline 91 is communicated with the lower convection heating element 6 through the lower valve body 92, one lower valve body 92 can be simultaneously communicated with a plurality of lower convection heating elements 6 through one pipe for splitting, and meanwhile, the condition that one lower valve body 92 is connected with one lower convection heating element 6 is not excluded, and the lower valve body 92 is specifically a proportional valve.
Specifically, as shown in fig. 2, 6 and 7, the upper convection heating element 4 includes an upper preheating pipe 41 and an upper exhaust pipe 42 which are communicated with each other, one end of the upper preheating pipe 41 is communicated with the gas control system, the other end of the upper preheating pipe 41 is communicated with the upper exhaust pipe 42, and the upper exhaust pipe 42 is provided with a plurality of upper exhaust holes; the lower convection heating element 6 comprises a lower preheating pipeline 61 and a lower exhaust pipeline 62 which are communicated with each other, one end of the lower preheating pipeline 61 is communicated with a gas control system, the other end of the lower preheating pipeline 61 is communicated with the lower exhaust pipeline 62, and the lower exhaust pipeline 62 is provided with a plurality of lower exhaust holes; the difference between the temperature of the compressed air discharged from the upper discharge holes of the upper discharge line 42 or the lower discharge holes of the lower discharge line 62 and the temperature inside the furnace body 1 is 1 ℃ or less.
Specifically, as shown in fig. 6 and 7, the upper preheating pipe 41 is wound in a reciprocating manner in a horizontal direction, wherein the reciprocating winding of the upper preheating pipe 41 in the horizontal direction does not require that the pipes of the upper preheating pipe 41 after each turn are parallel, but means that the upper preheating pipe 41 is integrally formed into a strip shape after reciprocating winding, and in addition, it is not excluded that the upper preheating pipe 41 is wound in a reciprocating manner in a vertical direction, or in a reciprocating manner in a direction inclined at any angle, or in a manner of winding into any regular or irregular geometric shape,
specifically, as shown in fig. 6 or fig. 7, the lower preheating pipe 61 is wound in a reciprocating manner in the horizontal direction, wherein the reciprocating winding of the lower preheating pipe 61 in the horizontal direction does not require that the pipe after each turn of the lower preheating pipe 61 is parallel, but means that the lower preheating pipe 61 is integrally formed into a strip shape after the reciprocating winding, and in addition, the reciprocating winding of the lower preheating pipe 61 in the vertical direction, or the reciprocating winding in the direction inclined at any angle, or the winding in any regular or irregular geometric shape is not excluded.
As can be seen from the above description, the upper preheating pipe 41 and the lower preheating pipe 61 are both wound in a reciprocating manner in the horizontal direction, so that the projected length of the upper convection heating element 4 or the lower convection heating element in the vertical direction can be reduced while the total length thereof is kept unchanged, and further, the compressed gas inside can be heated by a sufficient length without affecting the installation and lifting of the upper convection heating element 4 or the lower convection heating element 6.
Specifically, the total length of the upper preheating pipeline 41 is 3-7 meters, in a specific embodiment, the length of the upper preheating pipeline 41 is 3 meters, and the average temperature difference between the temperature of the compressed gas heated by the upper preheating pipeline 41 and the temperature in the furnace is less than or equal to 1 ℃; in another embodiment, the length of the upper preheating pipeline 41 is 5 meters, and the average temperature difference between the sprayed compressed gas heated by the upper preheating pipeline 41 and the temperature in the furnace is less than or equal to 0.5 ℃; in another embodiment, the length of the upper preheating pipeline 41 is 6 meters, and the average temperature difference between the sprayed compressed gas heated by the upper preheating pipeline 41 and the temperature in the furnace is less than or equal to 0.2 ℃; in another embodiment, the length of the upper preheating pipe 41 is 7 m, and the average temperature difference between the injected compressed gas heated by the upper preheating pipe 41 and the temperature in the furnace is less than or equal to 0.1 ℃. The total length of the lower preheating pipeline 61 is 3-7 meters, in a specific embodiment, the length of the lower preheating pipeline 61 is 3 meters, and the average temperature difference between the temperature of the compressed gas heated by the lower preheating pipeline 61 and the temperature in the furnace is less than or equal to 1 ℃; in another embodiment, the length of the lower preheating pipeline 61 is 5 meters, and the average temperature difference between the sprayed compressed gas heated by the lower preheating pipeline 61 and the temperature in the furnace is less than or equal to 0.5 ℃; in another embodiment, the length of the lower preheating pipeline 61 is 6 meters, and the average temperature difference between the sprayed compressed gas heated by the lower preheating pipeline 61 and the temperature in the furnace is less than or equal to 0.2 ℃; in another embodiment, the lower preheating pipe 61 has a length of 7 m, and the average temperature difference between the injected compressed gas heated by the lower preheating pipe 61 and the temperature in the furnace is less than or equal to 0.1 ℃.
Specifically, the diameter of the upper vent line 42 is smaller than or equal to the diameter of the lower vent line 62. When the coated glass is heated, the coated surface of the coated glass is generally positioned on the upper surface, so that the diameter of the upper vent hole of the upper vent pipe is smaller than that of the lower vent hole of the lower vent pipe, the diameter of the inner jet flow of the upper vent hole can be reduced, the heating precision of the coated surface is improved, and the temperature distribution of the coated surface can be uniform.
Specifically, a transparent conductive film is deposited on the upper surface of the glass, and the transparent conductive film comprises at least two metal layers, metal alloy layers or metal oxide layers. Wherein, the metal layer is made of gold (Au), silver (Ag), copper (Cu), aluminum (Al) or molybdenum (Mo); the metal alloy layer is made of silver alloy, such as silver-copper alloy, silver-indium alloy and the like; the metal oxide layer is made of Indium Tin Oxide (ITO), fluorine-doped tin oxide (FTO), aluminum-doped zinc oxide (AZO) or antimony-doped tin oxide (ATO); in order to protect the metal layer, the metal alloy layer or the metal oxide layer and improve the optical property, the chemical property and the mechanical property of the transparent conductive film, the transparent conductive film further comprises a plurality of dielectric layers, and the material of the dielectric layers is selected from at least one of oxides of Zn, Mg, Sn, Ti, Nb, Zr, Ni, In, Al, Ce, W, Mo, Sb and Bi elements, or nitrides and oxynitrides of Si, Al, Zr, Y, Ce and La elements and mixtures thereof.
Further, the convection heating lift system 7 controls the distance between the upper convection heating element 4 and the upper surface of the glass to be less than or equal to the distance between the lower convection heating element 6 and the lower surface of the glass. The closer the upper convection heating element 4 is to the upper surface of the glass, the better the upper convection heating element 4 heats the upper surface of the glass. In one embodiment, when the heating furnace is used for heating ordinary glass, the distance between the upper convection heating element 4 and the upper surface of the glass is equal to the distance between the lower convection heating element 6 and the lower surface of the glass; in another embodiment, when the surface-coated glass is heated using a heating furnace, the distance between the upper convection heating element 4 and the upper surface of the glass is smaller than the distance between the lower convection heating element 6 and the lower surface of the glass.
Further, the convection heating elevating system 7 controls the distance between the upper radiation heating element 3 and the upper surface of the glass to be 20mm to 200 mm.
Specifically, as shown in fig. 4, the convection heating lifting system 7 includes a lifting frame 71, a power mechanism and a lifting mechanism, the upper convection heating element 4 is fixedly connected to the lifting frame 71 through a lifting rod 711, the power mechanism is fixedly connected to the lifting frame 71, one end of the lifting mechanism is connected to the lifting frame 71, the other end of the lifting mechanism is connected to the furnace body 1, and the power mechanism is connected to the lifting mechanism and drives the lifting mechanism to change the distance between the lifting frame 71 and the furnace body 1; the power mechanism is connected with the lifting mechanism through a transmission assembly 74, the transmission assembly 74 comprises a power shaft 741 and a power steering gear 742, the power mechanism is connected with the lifting mechanism through the power shaft 741, or the power mechanism is connected with the power steering gear 742 through the power shaft 741 first and then connected with the lifting mechanism through the power steering gear 742 through the other power shaft 741, when the power mechanism and the lifting mechanism are located on the same straight line, the power mechanism and the lifting mechanism can be directly connected through the power shaft 741, and when the lifting mechanism is large in number and is not located on the same straight line with the power mechanism completely, the power mechanism and different lifting mechanisms can change the power transmission direction through the power steering gear 742. The furnace body 1 is provided with a guide ring, the lifting rod 711 is arranged in the guide ring in a penetrating manner, after the upper convection heating element 4 is fixedly connected with the lifting frame 71 through the lifting rod 711, the lifting rod 711 is limited through the guide ring fixed on the furnace body 1 so as to improve the stability of the lifting process. In a specific embodiment, the power mechanism is a power lifting motor 72, the lifting mechanism is a lifting screw lifter 73, the power lifting motor 72 is connected to the lifting screw lifter 73 through a transmission assembly 74 and drives a screw 731 of the lifting screw lifter 73 to extend, an end of the screw 731 of the lifting screw lifter 73 is fixedly connected to the furnace body 1, the power lifting motor 72 can drive the screw 731 of the lifting screw lifter 73 to extend through the transmission assembly 74, and since one end of the screw 731 of the lifting screw lifter 73 is fixed to the furnace body 1, when the screw 731 of the lifting screw lifter 73 extends or retracts, the whole lifting frame 71 connected to the power lifting motor can be driven to move, thereby achieving the lifting of the upper convection heating element 4 in the vertical direction. In addition, in some embodiments, the power mechanism may also be a mechanism that can provide power, such as a hydraulic assembly or a cylinder assembly, and the lifting mechanism may also be a mechanism that can implement a length changing function, such as a hydraulic telescopic rod or a jack.
As shown in fig. 4, the lifting frame 71 includes an upper frame 712 and a lower frame 713, the upper frame 712 and the lower frame 713 are connected by a fixing base 714, wherein the upper frame 712 is used for fixing the power lifting motor 72 and the lifting screw lifter 73, the power lifting motor 72 is connected with the lifting screw lifter 73 through the transmission assembly 74 and drives the screw 731 of the lifting screw lifter 73 to extend and retract, the end of the screw 731 of the lifting screw lifter 73 is fixedly connected to the top end of the upper furnace body, and the upper convection heating element 4 is fixedly connected to the lower frame 713 through the lifting rod 711 penetrating through the top end of the upper furnace body. The transmission assembly 74 includes a power shaft 741 and a power steering gear 742, the power lifting motor 72 is connected to the lifting screw elevator 73 through the power shaft 741, or the power lifting motor 72 is connected to the power steering gear 742 through one power shaft 741, and then the power steering gear 742 is connected to the lifting screw elevator 73 through the other power shaft 741.
Further, the furnace body 1 includes a first region and a second region, as shown in fig. 2, the first region has only one set of upper convection heating elements 4 in the direction perpendicular to the glass transportation direction, as shown in fig. 5, the second region has at least two sets of upper convection heating elements 4 in the direction perpendicular to the glass transportation direction, and the projection length of one set of upper convection heating elements 4 in the first region in the vertical direction is equal to the projection total length of the plurality sets of upper convection heating elements 4 in the second region in the vertical direction. The first area and the second area in the furnace body 1 are not in a sequential relation, the first area and the second area can be continuously arranged or arranged at intervals, when glass enters the first area, a group of upper convection heating elements 4 above the first area can be lifted to a proper distance under the control of a convection heating lifting system 7 and spray heated compressed gas on the whole glass surface; when glass gets into in the second region, three group upper portion convection heating elements 4 above it can be controlled at different heights by different convection heating operating system 7 respectively to the realization is heated the subregion of glass, and then improves and carries out different heats in order to guarantee that the temperature of each part of glass surface tends to the same to glass surface different region.
The invention also provides a glass heating method, which is used for heating glass by using the glass heating furnace and comprises the following steps:
the method comprises the following steps of firstly, obtaining a set temperature difference between the upper surface temperature and the lower surface temperature of the glass at the outlet end 12, wherein the value range of the set temperature difference is 0-5 ℃, and specific values of the set temperature difference are different according to different glasses to be heated, for example: for common glass, the value of the set temperature is 1 ℃; setting the temperature to be 2 ℃ for the single-layer coated glass; setting the temperature to be 5 ℃ for the double-layer or more than double-layer coated glass;
secondly, controlling a preset distance between the upper convection heating element 4 and the upper surface of the glass through the convection heating lifting system 7 according to the set temperature difference;
placing at least one piece of glass on a conveying device 2, conveying the glass to an outlet end 12 from an inlet end 11 of a furnace body 1 by the conveying device 2, carrying out radiation heating on the upper surface of the glass by an upper radiation heating element 3, carrying out convection heating on the upper surface of the glass by an upper convection heating element 4, carrying out radiation heating on the lower surface of the glass by a lower radiation heating element 5, and arranging a lower convection heating element 6 between the conveying device 2 and the lower radiation heating element 5, wherein the lower convection heating element 6 is used for carrying out convection heating on the lower surface of the glass;
measuring the upper surface temperature and the lower surface temperature of the glass of the mouth end 12 to obtain the actual temperature difference between the upper surface temperature and the lower surface temperature;
step five, if the actual temperature difference is larger than the set temperature difference, adjusting the preset distance in the step two, and repeating the step three and the step four until the actual temperature difference is smaller than or equal to the set temperature difference;
if the actual temperature difference is less than or equal to the set temperature difference, the distance between the upper convection heating element 4 and the upper surface of the glass is the set distance; if the actual temperature difference is larger than the set temperature difference and the upper surface temperature is larger than the lower surface temperature, increasing the preset distance in the second step; if the actual temperature difference is larger than the set temperature difference and the upper surface temperature is smaller than the lower surface temperature, reducing the preset distance in the second step;
and step six, heating the glass according to the set distance in the step 5, and enabling the temperature of the upper surface and the temperature of the lower surface of the glass conveyed to the outlet end 12 to be both greater than 500 ℃.
The glass heating furnace and the glass heating method are used for heating glass, the position of the upper convection heating element 3 can be adjusted according to the properties of different glass products, so that the upper convection heating element 3 can be located at the optimal heating distance, meanwhile, for common glass, the upper convection heating element 3 can efficiently spray compressed gas close to the temperature in the furnace to the surface of the glass, the temperature difference between the surface of the glass and the furnace is reduced, the conditions of edge warping and surface scalding are avoided, for complex multilayer coated glass, the heating temperature of one side of a coating layer plated on the glass can be improved by adjusting the distance between the upper convection heating element 3 and the surface of the glass, and the temperature of the two sides of the glass tends to be the same.
It should be understood that the invention is not limited to the embodiments described above, but that modifications and variations can be made by one skilled in the art in light of the above teachings, and all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (18)
1. A glass heating furnace is characterized by comprising a furnace body and a conveying device, wherein the furnace body is provided with an inlet end, an outlet end, a furnace body top and a furnace body bottom, the conveying device is positioned between the top of the furnace body and the bottom of the furnace body and is used for conveying the glass from the inlet end to the outlet end, an upper radiation heating element and an upper convection heating element are arranged between the conveying device and the top of the furnace body, the upper convection heating element is located between the transport and the upper radiant heating element, the upper radiant heating element is used for carrying out radiant heating on the upper surface of the glass, the upper convection heating element is used for carrying out convection heating on the upper surface of the glass, a lower radiation heating element is arranged between the transmission device and the bottom of the furnace body and used for carrying out radiation heating on the lower surface of the glass;
the heating furnace also comprises a convection heating lifting system, the convection heating lifting system is used for controlling the upper convection heating element to vertically lift between the conveying device and the upper radiation heating element, and the difference between the temperature of the upper surface and the temperature of the lower surface of the glass at the outlet end is smaller than or equal to a set temperature difference value.
2. The glass heating furnace according to claim 1, wherein the set temperature difference value is in a range of 0 to 5 ℃.
3. The glass-heating furnace of claim 1, wherein a lower convection heating element is further disposed between the conveyor and the lower radiant heating element, the lower convection heating element for convectively heating a lower surface of the glass.
4. The glass heating furnace according to claim 3, wherein the furnace further comprises a gas control system for supplying compressed air to the upper convection heating element and the lower convection heating element.
5. The glass heating furnace according to claim 4, wherein the upper convection heating element comprises an upper preheating pipe and an upper exhaust pipe which are communicated with each other, one end of the upper preheating pipe is communicated with the gas control system, the other end of the upper preheating pipe is communicated with the upper exhaust pipe, and the upper exhaust pipe is provided with a plurality of upper exhaust holes; the lower convection heating element comprises a lower preheating pipeline and a lower exhaust pipeline which are communicated with each other, one end of the lower preheating pipeline is communicated with the gas control system, the other end of the lower preheating pipeline is communicated with the lower exhaust pipeline, and the lower exhaust pipeline is provided with a plurality of lower exhaust holes; the difference between the temperature of the compressed air discharged from the upper vent holes of the upper vent pipeline or the lower vent holes of the lower vent pipeline and the temperature in the furnace body is less than or equal to 1 ℃.
6. The glass heating furnace according to claim 5, wherein the upper preheating pipe has a total length of 3 to 7 m, and the lower preheating pipe has a total length of 3 to 7 m.
7. The glass heating furnace according to claim 5, wherein the diameter of the upper vent line is smaller than or equal to the diameter of the lower vent line.
8. The glass heating furnace according to claim 1, wherein a transparent conductive film is deposited on the upper surface of the glass, and the transparent conductive film comprises at least two metal layers, metal alloy layers, or metal oxide layers.
9. The glass heating furnace according to claim 3, wherein the convection heating lift system controls a distance between the upper convection heating element and an upper surface of the glass to be less than or equal to a distance between the lower convection heating element and a lower surface of the glass.
10. The glass heating furnace according to claim 1, wherein the convection heating lift system controls a distance between the upper radiant heating element and the upper surface of the glass to be 20mm to 200 mm.
11. The glass heating furnace according to claim 1, wherein the convection heating elevating system comprises an elevating frame, a power mechanism and an elevating mechanism, the upper convection heating element is fixedly connected to the elevating frame through an elevating rod, the power mechanism is fixedly connected to the elevating frame, one end of the elevating mechanism is connected to the elevating frame, the other end of the elevating mechanism is connected to the furnace body, the power mechanism is connected to the elevating mechanism and drives the elevating mechanism to change the distance between the elevating frame and the furnace body; the power mechanism is connected with the lifting mechanism through a transmission assembly, the transmission assembly comprises a power shaft and a power steering gear, and the power mechanism is connected with the lifting mechanism through the power shaft, or the power mechanism is connected with the power steering gear through one power shaft and then connected with the lifting mechanism through the other power shaft by the power steering gear.
12. The glass-heating furnace of claim 11, wherein the furnace body is provided with a guide ring, and the lifting rod is inserted into the guide ring.
13. The glass heating furnace according to any one of claims 1 to 12, wherein the furnace body includes a first region in which there is only one set of upper convection heating elements in a direction perpendicular to the glass transport direction and a second region in which there are at least two sets of upper convection heating elements in the direction perpendicular to the glass transport direction, and a projected length of the one set of upper convection heating elements in the first region in the vertical direction is equal to a projected total length of the plurality sets of upper convection heating elements in the second region in the vertical direction.
14. A glass heating method for heating glass using the glass heating furnace according to any one of claims 1 to 13, characterized by comprising the steps of:
the method comprises the following steps of firstly, acquiring a set temperature difference between the upper surface temperature and the lower surface temperature of glass at an outlet end;
secondly, controlling a preset distance between an upper convection heating element and the upper surface of the glass through a convection heating lifting system according to the set temperature difference;
placing at least one piece of glass on a conveying device, conveying the glass from an inlet end to an outlet end of a furnace body by the conveying device, carrying out radiant heating on the upper surface of the glass by an upper radiant heating element, carrying out convection heating on the upper surface of the glass by an upper convection heating element, and carrying out radiant heating on the lower surface of the glass by a lower radiant heating element;
measuring the upper surface temperature and the lower surface temperature of the glass at the outlet end to obtain the actual temperature difference between the upper surface temperature and the lower surface temperature;
step five, if the actual temperature difference is larger than the set temperature difference, adjusting the preset distance in the step two, and repeating the step three and the step four until the actual temperature difference is smaller than or equal to the set temperature difference;
if the actual temperature difference is less than or equal to the set temperature difference, the distance between the upper convection heating element and the upper surface of the glass is the set distance;
and step six, heating the glass according to the set distance in the step 5, and enabling the temperature of the upper surface and the temperature of the lower surface of the glass conveyed to the outlet end to be both greater than 500 ℃.
15. The glass heating method according to claim 14, wherein in the first step, the set temperature difference is in a range of 0 to 5 ℃.
16. The glass heating method according to claim 14, wherein in step three, a lower convection heating element is further disposed between the conveyor and the lower radiant heating element, the lower convection heating element for convection heating of the lower surface of the glass.
17. The method for heating glass according to claim 14, wherein in the fifth step, if the actual temperature difference is larger than the set temperature difference and the upper surface temperature is higher than the lower surface temperature, the preset distance in the second step is increased.
18. The method for heating glass according to claim 14, wherein in the fifth step, if the actual temperature difference is larger than the set temperature difference and the upper surface temperature is lower than the lower surface temperature, the preset distance in the second step is decreased.
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| CN113636747B (en) | 2023-10-13 |
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