An auxiliary electric heating structure for float line tin bath and a manufacturing method thereof

Abstract

The application discloses a kind of float line tin groove online auxiliary electric heating structure and its manufacturing method, the auxiliary electric heating structure of float line tin groove online, including heating element, for the glass liquid in tin groove is heated;Supporting connection mechanism, including thermal stabilizing element and connecting body, one end of the thermal stabilizing element is connected with the connecting body, and the other end is sleeved and slidably connected on the heating element;Driving mechanism is connected with the connecting body, and the connecting body can be driven to move relative to glass liquid.The auxiliary electric heating structure of float line tin groove online disclosed in the application moves the heating element by driving mechanism, and the heating of fixed area glass plate is controlled, so as to effectively control the temperature field in float glass production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of float glass manufacturing, in particular to an auxiliary electric heating structure for a float line tin bath and a manufacturing method thereof. BACKGROUND

[0002] In float glass production, the tin bath is one of the three major thermal equipment, and the quality of the tin bath seriously affects the quality of the glass product. The working principle of the tin bath is that the glass liquid flowing from the channel is uniformly spread on the molten metal tin liquid, and under the protection of the protective gas, the glass liquid is controlled in the required thickness range by using electric heating and edge puller, while ensuring the uniform and flat spreading of the glass. Under this process, the use of electric heating plays a crucial role.

[0003] The tin bath area generally adopts a top plug type heating element electric heating form, which is controlled in the longitudinal and transverse directions, and is used to control the temperature and viscosity of the glass liquid in different areas, so as to control the thinning extension of the glass plate. In particular in the field of electronic ultra-thin production, the thickness difference of the glass is required to be high, and the wave degree and diopter are required to be high, and the transverse and longitudinal temperature field of the forming area is required to be higher. Unreasonable temperature distribution is easy to cause wave degree and diopter to be bad or even exceed the standard, which affects the surface quality and optical performance of the glass.

[0004] In addition, in the field of high-aluminum electronic glass, especially in the field of two-strong (lithium aluminum silicon glass) electronic glass production, in order to meet the requirements of ultra-thin forming, the use of electric heating is more, especially for the important forming area, the opening of electric heating can reach more than 80%, and higher surface temperature and opening are easy to cause the energy attenuation of the heating element or the fracture of the heating element, thereby seriously affecting the thinning process and apparent optical performance of the glass plate, causing the thickness to exceed the standard, and the wave degree and diopter to exceed the standard.

[0005] In float glass production, there is no very effective means to deal with the above temperature process control problems and heating capacity attenuation problems, and in most cases, cold modification is adopted to deal with the problems, which takes a long time and requires a large investment, and is not conducive to economic production.

[0006] Therefore, how to control the temperature field in float glass production has become a problem that people are eager to solve. SUMMARY

[0007] (I) Purpose of application

[0008] Therefore, in order to solve the problem that the temperature field cannot be effectively controlled in float glass production, the present application discloses the following technical scheme.

[0009] (II) Technical scheme

[0010] The present application discloses an auxiliary electric heating structure for a float line tin bath, comprising:

[0011] a heating element for heating the glass liquid in the tin bath;

[0012] a support connecting mechanism, comprising a heat-stable element and a connecting body, one end of the heat-stable element being connected with the connecting body, and the other end being sleeved and slidingly connected on the heating element;

[0013] a driving mechanism, connected with the connecting body, and capable of driving the connecting body to move relative to the glass liquid.

[0014] Further, the heat-stable element comprises a hollow shell and a fixing groove arranged at one end of the hollow shell, and a through hole for fixing the heating element is arranged at the end of the fixing groove away from the hollow shell.

[0015] Further, an insulating tube is arranged in the through hole, and the heating element is fixed in the insulating tube.

[0016] Further, the fixing groove is further provided with a cooling gas tube.

[0017] Further, the connecting body comprises a cooling device, which extends into the hollow shell after passing through the fixing groove, so as to cool the heating element in the hollow shell.

[0018] Further, the cooling device comprises a water inlet pipe, a water outlet pipe and a cooling pipe wrapping the water inlet pipe and the water outlet pipe, and one end of the water inlet pipe is communicated with one end of the water outlet pipe.

[0019] Further, the part of the cooling pipe extending into the fixing groove and / or the hollow shell is wrapped with a buffer material.

[0020] Further, the hollow shell comprises the following components in weight percentage: Al2O3 60-68 parts, SiO2 30-36 parts, Fe2O3 content ≤0.7 parts, and Na2O content ≤0.3 parts.

[0021] Further, the heating element comprises a conductive part, and a heating part and a connecting terminal arranged at two ends of the conductive part respectively.

[0022] Further, the heating element is a U-shaped silicon-carbon rod, the two end portions of the two side arms of the U-shaped silicon-carbon rod are the connecting terminals, the side of each side arm close to the connecting terminal is provided with the conductive part, and the rest is the heating part.

[0023] Further, the silicon-carbon rod is a U-shaped silicon-carbon rod, the two end portions of the two side arms of the U-shaped silicon-carbon rod are the connecting terminals, the side of each side arm close to the connecting terminal is provided with the conductive part, and the rest is the heating part.

[0024] Further, the driving mechanism comprises a crossbeam, a hanging structure hung on the crossbeam, a lifting mechanism arranged at the bottom of the hanging structure, and a supporting pulley arranged on the lifting mechanism for supporting the connecting body.

[0025] Further, the crossbeam is provided with a sliding groove along the length direction, and the top of the hanging structure is provided with a fixed pulley movable along the sliding groove, wherein the fixed pulley is provided with a coaxial first gear, and the hanging structure is provided with a driving motor and a second gear mounted on the driving motor, and the first gear and the second gear are connected through a transmission belt.

[0026] In another aspect of the present application, a manufacturing method of an auxiliary electric heating structure for an online float line tin bath is provided, comprising the following steps:

[0027] A connecting body and a mold are provided, and the connecting body is fixed in the mold.

[0028] A heat-stable element is prepared by using the mold.

[0029] The connecting body and the driving mechanism are provided, and the heat-stable element, the heating element, the connecting body and the driving mechanism are assembled.

[0030] Further, the method for preparing the heat-stable element by using the mold comprises:

[0031] The raw material of the hollow shell and water are mixed uniformly at a weight ratio of 1:0.08-0.15, and then poured into the mold, wherein the raw material of the hollow shell comprises the following components calculated by weight fraction: Al2O3 60-68 parts, SiO2 30-36 parts, Fe2O3 content ≤0.7 parts, and Na2O content ≤0.3 parts.

[0032] The mixed material in the mold is kept warm, and the keeping warm temperature is 20-50℃, and the keeping warm time is greater than 7 days.

[0033] The mold is demolded.

[0034] Further, the keeping warm of the mixed material in the mold further comprises: spraying water to keep the mixed material in the mold moist during the keeping warm time.

[0035] Further, the fixing of the connecting body in the mold comprises: wrapping the part of the connecting body installed in the mold with thermal insulation cotton.

[0036] (Three) beneficial effects

[0037] The application discloses an auxiliary electric heating structure for a float line tin bath and a manufacturing method thereof. The auxiliary electric heating structure for the float line tin bath moves the heating element through a driving mechanism, controls the heating of the fixed area glass plate at a fixed point, and thus effectively controls the temperature field in the float glass production. In addition, the application sets a thermal stabilizing element, which not only improves the heat preservation efficiency, prevents the temperature of the tin bath from fluctuating after the connecting body enters the tin bath, but also avoids the contact between the connecting body and the heating element, realizes the insulation and support of the heating element, ensures the deeper depth of the heating element in the tin bath, and thus more effectively controls the temperature field. BRIEF DESCRIPTION OF DRAWINGS

[0038] The embodiments described below with reference to the drawings are exemplary and are intended to explain and illustrate the application, and cannot be understood as a limitation on the protection scope of the application.

[0039] Figure 1 is a structural schematic view of an auxiliary electric heating structure for a float line tin bath disclosed by the application;

[0040] Figure 2 is a structural schematic view of a thermal stabilizing element in the auxiliary electric heating structure for the float line tin bath disclosed by the application;

[0041] Figure 3 is a structural schematic view of a connecting body in the auxiliary electric heating structure for the float line tin bath disclosed by the application;

[0042] Figure 4 is a schematic view of a U-shaped silicon-carbon rod in the auxiliary electric heating structure for the float line tin bath disclosed by the application;

[0043] Figure 5 is a structural schematic view of a driving mechanism in the auxiliary electric heating structure for the float line tin bath disclosed by the application;

[0044] Figure 6 is a combined schematic view of a manufacturing mold of the thermal stabilizing element disclosed by the application;

[0045] Marked in the figure: heating element 1, conductive part 101, heating part 102, wiring end 103, thermal stabilizing element 2, hollow shell 201, fixed groove 202, through hole 203, insulating tube 204, cooling gas pipe 205, connecting body 3, water inlet pipe 301, water outlet pipe 302, cooling pipe 303, cross beam 4, suspension structure 5, lifting mechanism 6, supporting pulley 7, fixing part 8, sliding groove 9, fixed pulley 10, first gear 11, driving motor 12, second gear 13, conveying belt 14, mold 15. DETAILED DESCRIPTION

[0046] For the purpose, technical solutions and advantages of the present application, the technical solutions in the embodiments of the present application will be described in more detail below in combination with the drawings in the embodiments of the present application.

[0047] As shown in Figure 1 The application provides an auxiliary electric heating structure for a float line tin bath, comprising a heating element 1, a support connecting mechanism and a driving mechanism, the heating element 1 is used for heating the glass liquid in the tin bath; the support connecting mechanism comprises a thermal stabilizing element 2 and a connecting body, one end of the thermal stabilizing element 2 is connected with the connecting body, and the other end is sleeved and slidably connected on the heating element 1; the driving mechanism is connected with the connecting body and can drive the connecting body to move relative to the glass liquid.

[0048] The auxiliary electric heating structure for the float line tin bath provided by the application adopts a driving mechanism to move the heating element 1, and controls the heating of the fixed area of the glass plate at a fixed point, thereby solving the problems of process defects of ultra-thin glass or thickness or optical defects caused by power attenuation of electric heating in the original design process. In specific use, two sets of the auxiliary electric heating structure for the float line tin bath provided by the application can be used and symmetrically distributed on both sides of the tin bath.

[0049] Preferably, the heating element 1 is located 200 mm above the glass plate, has the advantages of fast heating, good effect, easy control and simple operation, and can effectively solve the problems of optical performance and thickness of the glass plate.

[0050] Preferably, as shown in Figure 2 The thermal stabilizing element 2 comprises a hollow shell 201 and a fixing groove 202 arranged at one end of the hollow shell 201, and a through hole 203 for fixing the heating element 1 is arranged at the end of the fixing groove 202 away from the hollow shell 201. The heating element 1 preferably uses a silicon-carbon rod, and can also use a burner and a brick structure covered with a molybdenum electrode or a platinum-gold electrode.

[0051] Preferably, the heating element 1 comprises a conductive part 101, a heating part 102 and a wiring end 103 arranged at both ends of the conductive part 101, respectively.

[0052] Preferably, the heating element 1 is a silicon-carbon rod, the end of the silicon-carbon rod is a terminal 103, the conductive part 101 is arranged adjacent to the terminal 103, and the rest is a heating part 102. In a specific implementation, the shape of the silicon-carbon rod can be U-shaped or other shapes, as long as one end of the silicon-carbon rod can generate heat as the heating part 102, and the other end can be slidably inserted into the heat-stable element 2. In a specific implementation, when the heating element 1 is a U-shaped silicon-carbon rod, two through holes 203 for fixing the two side arms of the U-shaped silicon-carbon rod are arranged on the fixing groove 202, and the openings of the through holes 203 are completely sealed with sealing mud to avoid the inflow of the source from the gap.

[0053] In a typical embodiment, as shown in Figure 4 , the heating element 1 is a U-shaped silicon-carbon rod, the two side arm ends of the U-shaped silicon-carbon rod are terminals 103, the two side arms are respectively arranged adjacent to the conductive part 101, and the rest is the heating part 102.

[0054] The U-shaped silicon-carbon rod, the heating part 102 is at the U-shaped bending part, the horizontal length of the heating part 102 accounts for 1 / 3-1 / 2 of the horizontal length of the heating element, and the heating part 102 extends from the U-shaped bending part along the two side walls to heat the glass plate. The U-shaped silicon-carbon rod is internally provided with a through hole structure, which can reduce the weight and improve the operation safety; the two side arms of the U-shaped silicon-carbon rod are inserted into the through hole of the heat-stable element 2, and the heating part 102 is located outside the heat-stable element 2. By controlling the forward and backward movement of the suspension structure 5, the heating part 102 is moved to the fixed-point heating area for power supply.

[0055] Preferably, referring to Figure 6 , the through hole 203 is internally provided with an insulating tube 204, and the heating element 1 is fixed in the insulating tube 204. In a specific implementation, the insulating tube 204 can be made of high-temperature-resistant aluminum oxide ceramic tube with a wall thickness of 2-3 mm. The aluminum oxide ceramic tube mainly serves to support the heating element 1 and strengthen the insulation.

[0056] Preferably, referring to Figure 2 , the fixing groove 202 is further provided with a cooling gas pipe 205, and the cooling gas pipe 205 is arranged in a spaced manner with the insulating tube 204. Pure nitrogen gas is introduced into the cooling gas pipe 205 to fill the fixing groove 202 and enter the heat-stable element 2 through the gap between the cooling device and the hollow shell 201, thereby effectively protecting the heat-stable element 2 and preventing the heat-stable element 2 from being weakened due to high temperature.

[0057] Preferably, as shown in Figure 3 , the connecting body 3 comprises a cooling device, which extends into the hollow shell 201 after passing through the fixing groove 202, thereby achieving the cooling of the heating element 1 in the hollow shell 201.

[0058] Preferably, the cooling device comprises water inlet pipe 301, water outlet pipe 302 arranged in parallel, and cooling pipe 303 wrapping water inlet pipe 301 and water outlet pipe 302, one end of water inlet pipe 301 communicates with one end of water outlet pipe 302. In specific implementation, the cooling pipe 303 adopts rectangular steel, arranged in upper and lower, lower rectangular steel wrapping water inlet pipe 301, upper rectangular steel wrapping water outlet pipe 302, the size of rectangular steel can be determined according to the size of edge seal, when applied in float method, the length of the cooling device is greater than or equal to 4.0m, and the length of the cooling device can also be adjusted according to actual situation.

[0059] Preferably, the part of cooling pipe 303 extending into fixed groove 202 and / or hollow shell 201 is wrapped with buffer material. In specific implementation, the buffer material can be selected as pearl wool with thickness of 0.5-1mm, which melts rapidly at high temperature, mainly used for protecting the cooling device under hot state, avoiding the cooling device deformed and leaked due to the hot stable element expanding and pressing the cooling device. Further, the cooling pipe 303 can be selected as square steel, round steel or rectangular steel, and can be selected as ordinary carbon steel or stainless steel material, preferably rectangular stainless steel, which can increase the support area between the hot stable element 2 and the cooling pipe 303, and increase the support force of the hot stable element 2.

[0060] Preferably, as shown in Figure 5 The driving mechanism comprises cross beam 4, hanging structure 5 hung on cross beam 4, lifting mechanism 6 arranged at the bottom of hanging structure 5, and support pulley 7 arranged on lifting mechanism 6 for supporting connecting body 3, and fixing part 8 arranged on hanging structure 5 for fixing connecting body 3. In specific implementation, two groups of lifting mechanisms 6 are symmetrically arranged at the bottom of hanging structure 5, and support pulley 7 for supporting connecting body 3 is arranged on each group of lifting mechanisms 6. The lifting mechanism 6 comprises at least two parallel arranged lifting control screws. The fixing part 8 comprises a plurality of fixing nuts for fixing connecting body 3.

[0061] The hanging structure 5 is fixedly combined with the connecting body 3 through support structure below, the height of support pulley 7 can be adjusted manually by lifting control screw, so as to achieve the purpose of controlling the up and down movement of connecting body 3, the main function of fixing nut is to press and fix connecting body 3, and adjusting the height of lifting control screw can achieve the purpose of adjusting the flatness of connecting body 3; connecting body 3 is placed on support pulley 7, connecting body 3 is fixed by fixing nut, and the up and down and left and right movement of connecting body 3 is realized.

[0062] Also see Figure 1In the middle, the suspension structure can be divided into the upper part of the suspension structure and the lower part of the suspension structure, and the connection part between the upper part of the suspension structure and the lower part of the suspension structure is preferably a simple bolt connection, which is low in cost, and the height of the connection main body 3 is adjusted by manually controlling the lifting control screw rod, and more preferably, a rotary connection structure is selected, the lower part of the suspension structure is driven to rotate as a whole by a rotary motor, and the angle of the connection main body 3 and the electric heating into the tin bath is controlled, so that the electric heating into the tin bath can be selected at a positive angle, a negative angle or 0 angle, and the flexible control of the heating area of the electric heating is realized

[0063] More preferably, the cross beam 4 is provided with a sliding groove 9 along the length direction, and the top of the suspension structure 5 is provided with a fixed pulley 10 which can move along the sliding groove 9, and the fixed pulley 10 is provided with a coaxial first gear 11, and the suspension structure 5 is provided with a driving motor 12 and a second gear 13 mounted on the driving motor 12, and the first gear 11 and the second gear 13 are connected by a conveying belt 14.

[0064] The moving fixed pulley 10 can realize the forward and backward movement of the overall structure under the driving of the driving motor 12 and the gear; on both sides of the cross beam, mechanical limiters are arranged to protect the trolley and prevent falling; in specific use, the cross beam 4 can be selected as an H-shaped cross beam.

[0065] In another aspect of the present application, a manufacturing method of an auxiliary electric heating structure for an online float line tin bath is provided, which comprises the following steps:

[0066] A connection main body and a mold are provided, and the connection main body is fixed in the mold;

[0067] A heat-stable element is prepared by using the mold;

[0068] The connection main body and a driving mechanism are provided, and the heat-stable element, the heating element, the connection main body and the driving mechanism are assembled.

[0069] Preferably, the method for preparing the heat-stable element by using the mold comprises:

[0070] ①, the raw material of the hollow shell is mixed with water in a weight ratio of 1:0.08-0.15, and then poured into the mold, the raw material of the hollow shell comprises the following components in weight fraction: Al2O3 60-68 parts, SiO2 30-36 parts, Fe2O3 content ≤0.7 parts, Na2O content ≤0.3 parts; the heat-stable element prepared by using the raw material of the present application has a maximum temperature resistance ≥1600℃.

[0071] ②, the mixed material in the mold is heat preserved, the heat preservation temperature is 20-50℃, and the heat preservation time is greater than 7 days; then demolding can be carried out.

[0072] Preferably, the heat preservation of the mixture in the mold also includes spraying water on the mixture in the mold to keep it moist during the heat preservation time.

[0073] Preferably, the fixed connection body is in the mold, including wrapping the part of the connection body installed in the mold with insulation cotton.

[0074] In this structure, the heat-stable element 2, which plays an important role in supporting insulation and heat preservation, has the following specific processing steps:

[0075] First step: make a mold 15, the schematic diagram of which is shown in Figure 6 The mold 15 can be made of stainless steel, composite board or other materials, and the composite board is preferred to ensure a smooth surface without burrs.

[0076] Second step: wrap the part of the cooling pipe 303 embedded in the heat-stable element 2 with light and thin insulation cotton, preferably pearl cotton, with a thickness of 0.5-1.0 mm.

[0077] Third step: place the wrapped cooling pipe 303 and insulation pipe inside the hollow shell 201 and fix them, as shown in the effect diagram in Figure 6 Ensure that the cooling pipe 303 and insulation pipe are placed horizontally and evenly coated with lubricating oil inside the hollow shell 201 to facilitate demolding after forming; preferably, the insulation pipe is made of an alumina ceramic pipe.

[0078] Fourth step: select the raw materials for making the heat-stable element 2 and stir them with tap water, with a raw material to water weight ratio of 1:0.08-0.15, preferably 1:0.10. Pour the mixed raw materials into the mold 15 and vibrate them evenly and densely with a handheld vibration device.

[0079] Fifth step: place the vibrated mold 15 in a dry environment with a temperature of 20-50°C. Spray a layer of water on the surface of the mold 15 with a sprayer every morning and evening to protect the surface from drying and cracking. After 7 days of curing, the heat-stable element 2 is formed, and it can be used directly after removing the mold 15.

[0080] Example one

[0081] A 70T / D electronic glass production line, in the production of a strong high-aluminum silicon ultra-thin electronic glass, the surface micro-ripple of the glass plate is relatively poor, when the thickness is 0.65mm, the surface micro-ripple is generally 0.20-0.25μm / 20mm, through the point light source detector, there are tin bath defects such as rain-like on the surface of the glass plate, the surface is similar to a row of stripe defects, the main reason is that during glass forming, due to mechanical stress problem of edge finishing machine or uneven temperature field, resulting in glass liquid forming defects, through the adjustment of electric heating temperature system, there is no improvement, in order to solve this problem, a pair of auxiliary electric heating structure is installed in the heavy heating area of the tin bath, such as before the 4th edge finishing machine, before the 6th edge finishing machine and before the 8th edge finishing machine, the power of a pair of electric heating is opened about 15-25kw, through the temperature effect of the auxiliary electric heating structure, the ripple is obviously improved, and finally the ripple is stabilized at 0.10-0.15μm / 20mm, the surface rain-like stripe defects are obviously reduced and lightened, meeting the qualified product requirements.

[0082] Example two

[0083] During the production of a strong lithium aluminum silicon electronic glass on a 50T / D electronic glass production line, due to the extremely easy crystallization of lithium aluminum silicon, there are many crystallization defects in the glass plate. In order to reduce the defects of the glass plate, the temperature of the glass plate is increased by increasing the power of the silicon-carbon rod to more than 90%. Due to the high opening of the electric heating, the maximum power of the silicon-carbon rod in the important forming area is generally attenuated by more than 50% after long-term use, and the maximum area is attenuated by more than 70%. As a result, the thickness and thickness difference of the produced electronic ultra-thin glass cannot be controlled, and the thickness difference increases from ≤0.02mm to ≥0.05mm, which does not meet the requirement of maximum thickness difference ≤0.03mm. After adding an auxiliary electric heating structure, the thickness difference is effectively controlled, as follows:

[0084] (1) Rectangular stainless steel is used as a cooling water pipe, and the size of the rectangular steel is 100mm*60*4500mm*6mm. The welded rectangular steel is wrapped with 0.5mm thick pearl wool and placed in the mold 15;

[0085] (2) The alumina ceramic pipe is installed in the mold 15 and fixed, and the size of the alumina ceramic pipe is 50mm*1120mm*2.5mm;

[0086] (3) Lubricating oil is applied inside the mold 15, the raw materials for making the thermal stability element 2 are poured into the mold 15, a small vibration rod is vibrated uniformly and densely, and the mold 15 is placed outside the tin bath with an environmental temperature of 38±5℃. After 7 days of placement and curing, the mold 15 is removed;

[0087] (4) The connecting body 3 is placed on the driving mechanism and fixed in position, and the fixed groove is started to be installed. The nitrogen inlet pipe diameter is φ15mm, and the fixed groove is made of stainless steel square groove;

[0088] (5) high-density U-shaped silicon-carbon rod is inserted into the through hole of the alumina ceramic tube, the silicon-carbon rod is high-density silicon-carbon rod, φ40mm, the maximum heating power is 45±5kw, the heating part 102 is located at the head 1000mm position, and the total length is 2250mm;

[0089] (6) three pairs of auxiliary electric heating structures are installed before the first, fifth and eighth edge rollers in the total 16 pairs of edge rollers in the tin bath production line, the auxiliary electric heating structure before the first edge roller is used for heating the glass plate temperature, reducing the crystallization defects caused by low glass liquid temperature, and the auxiliary electric heating structures before the fifth and eighth edge rollers are used for heating and thinning the glass plate in the important thickness thinning area.

[0090] Table 1 is an embodiment of the auxiliary electric heating structure in the tin bath in the float line under multiple production environments:

[0091] During normal production, the thickness difference can be well controlled by increasing or decreasing the electric power because the electric heating power is normal, during the production of 0.55mm, the maximum thickness of the transverse glass plate is 0.555mm, the minimum thickness is 0.541mm, and the thickness difference is 0.014mm, which meets the standard of 0.03mm thickness difference;

[0092] During the electric heating attenuation period, the electric heating attenuation in the forming area is serious, which makes it difficult to control the temperature field of the glass plate, the important thinning area cannot meet the electric heating requirements, and the thickness difference is seriously out of standard, which cannot be adjusted, wherein the maximum thickness is 0.607mm, the minimum thickness is 0.552mm, and the thickness difference is 0.055mm;

[0093] After increasing the auxiliary electric heating, the maximum electric power of each pair can be increased by 80kw, due to the increase of the electric heating capacity, the glass thinning capacity is improved, the thickness difference gradually recovers to be stable, the maximum thickness is 0.563mm, the minimum thickness is 0.542mm, and the thickness difference is 0.021mm, and stable production is realized.

[0094]

[0095] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements within the technical range disclosed in the present application can be easily thought by those skilled in the art, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An auxiliary electric heating structure for use in a float line tin bath, characterized by, include: A heating element, used to heat the glass liquid in the tin bath; A supporting connection mechanism, comprising a heat-stable element and a connection body, wherein one end of the heat-stable element is connected to the connection body, and the other end is sleeved and slidably connected to the heating element; A driving mechanism is connected to the connecting body and can drive the connecting body to move relative to the glass liquid; wherein: The thermally stable element comprises a hollow shell and a fixing groove provided at one end of the hollow shell, wherein the fixing groove has a through hole at one end away from the hollow shell for fixing the heating element; an insulating tube is installed in the through hole, and the heating element is fixed in the insulating tube; the hollow shell comprises the following components calculated by weight: 60-68 parts of Al2O3, 30-36 parts of SiO2, ≤0.7 parts of Fe2O3, and ≤0.3 parts of Na2O; The heating element includes a conductive part, and a heating part and a terminal respectively arranged at both ends of the conductive part; the heating element is a silicon carbon rod, the end of the silicon carbon rod inserted into the thermally stable element is the terminal, the conductive part is adjacent to the terminal, and the remaining part is the heating part; the silicon carbon rod is a U-shaped silicon carbon rod, the ends of the two side arms of the U-shaped silicon carbon rod are the terminal, the two side arms are respectively adjacent to the conductive part, the annular end of the U-shaped silicon carbon rod is the heating part, and the horizontal length of the heating part is 1 / 3-1 / 2 of the horizontal length of the heating element.

2. The auxiliary electric heating structure for on-line use in a float line tin bath according to claim 1, characterized in that: The fixing groove is also equipped with a cooling air pipe.

3. The auxiliary electric heating structure for float line tin bath on-line according to claim 1, characterized in that: The connecting body includes a cooling device, which extends into the hollow shell after passing through the fixing groove to achieve cooling of the heating element in the hollow shell.

4. The auxiliary electric heating structure for on-line use in a float line tin bath according to claim 3, characterized in that: The cooling device includes a water inlet pipe, a water outlet pipe, and a cooling pipe wrapped around the water inlet pipe and the water outlet pipe, one end of the water inlet pipe is connected to one end of the water outlet pipe.

5. The auxiliary electric heating structure for float line tin bath online according to claim 4, characterized in that: The portion of the cooling pipe extending into the fixing groove and / or the hollow shell is wrapped with a buffer material.

6. The auxiliary electric heating structure for on-line use in a float line tin bath according to claim 1, characterized in that: The driving mechanism includes a crossbeam, a suspension structure hung on the crossbeam, a lifting mechanism arranged at the bottom of the suspension structure, and a support pulley arranged on the lifting mechanism for supporting the connection body. The suspension structure is provided with a fixing piece for fixing the connection body.

7. The auxiliary electric heating structure for the float line tin bath according to claim 6, characterized in that: The crossbeam is provided with a slide groove along its length direction, and a fixed pulley movable along the slide groove is provided on the top of the suspension structure, and a coaxial first gear is provided on the fixed pulley, and a drive motor and a second gear installed on the drive motor are provided on the suspension structure, and the first gear and the second gear are connected by a conveyor belt.

8. A method for manufacturing an auxiliary electric heating structure for use in a float line tin bath according to claim 1, characterized by, The following steps are involved: Providing a connecting body and a mold, and fixing the connecting body in the mold; Using molds to prepare thermally stable components; The method for preparing a thermally stable component using a mold comprises: uniformly mixing raw materials for a hollow shell with water in a weight ratio of 1:0.08-0.15, and then pouring the mixture into a mold, wherein the raw materials for the hollow shell comprise the following components calculated by weight: 60-68 parts of Al2O3, 30-36 parts of SiO2, ≤0.7 parts of Fe2O3, and ≤0.3 parts of Na2O; The mixture in the mold is kept warm, the temperature is 20-50 DEG C, and the keeping warm time is more than 7 days; and the mold is demolded; The connecting body and the driving mechanism are provided, and the stable element, the heating element, the connecting body and the driving mechanism are assembled.

9. The method of claim 8, wherein the auxiliary electric heating structure is formed by a method comprising: forming a first electrically conductive layer on the surface of the float line; forming a second electrically conductive layer on the first electrically conductive layer; and forming a third electrically conductive layer on the second electrically conductive layer. The keeping warm of the mixture in the mold further comprises spraying water to keep the mixture in the mold moist during the keeping warm time.

10. The method of claim 9, wherein the auxiliary electric heating structure is formed by a method comprising: forming a first electrically conductive layer on the surface of the float line; forming a second electrically conductive layer on the first electrically conductive layer; and forming a third electrically conductive layer on the second electrically conductive layer. The fixed connecting body in the mold comprises wrapping the part of the connecting body installed in the mold with the heat preservation cotton.

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