Crucible kiln for glass manufacturing test

Abstract

The utility model discloses a crucible kiln for a glass manufacturing test, which is characterized in that a heating flange, closest to the bottom of the crucible kiln, on a platinum discharge pipe in the existing crucible kiln is detached, an insulating sleeve is used for wrapping the part on the platinum discharge pipe, and a heating wire is arranged on the insulating sleeve to heat and preserve heat of the platinum discharge pipe. The current of the electric heating wire cannot act on the platinum discharge pipe, even if the distance between the electric heating wire and the platinum stirring rod is close, a loop cannot be formed in the molten glass due to potential difference, the number of bubbles in the molten glass can be reduced, and the problem that the molten glass in an existing crucible kiln is prone to generating bubbles due to potential difference can be effectively solved. The quality of the glass obtained by the test is closer to that of the actual production, and the test reliability is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of glass manufacturing, and particularly relates to a glass manufacturing test crucible kiln. BACKGROUND

[0002] In the special glass manufacturing industry, a new glass formula generally needs to be tested by using a small test kiln and cooperating with related components before being put into production, the small test kiln is generally called a crucible kiln because of its appearance like a crucible, the related components include a heating element, a platinum stirring rod and a platinum discharge pipe, the heating element is annularly arranged outside the crucible kiln to realize heat transfer through the side wall and heating, the platinum stirring rod is vertically arranged in the crucible kiln, the upper end of the platinum stirring rod is connected to a power source to be used for stirring, the platinum discharge pipe is vertically arranged below the crucible kiln and is connected to a discharge hole in the bottom of the crucible kiln to be used for outputting glass liquid, heating flanges are arranged on the platinum discharge pipe at intervals to be used for heating and heat preservation, after glass production ingredients are put into the crucible kiln, the heating element melts the glass production ingredients to form glass liquid which is stirred uniformly by the platinum stirring rod, the glass liquid in the crucible kiln is conveyed to a forming device through the platinum discharge pipe, the glass liquid temperature is kept through the heating flanges during the conveying process, and the forming device is used for forming and annealing the glass liquid.

[0003] In order to fully stir the glass liquid, the lower end of the platinum stirring rod is generally close to the bottom of the crucible kiln, and in order to avoid rapid temperature drop of the glass liquid after flowing out of the crucible kiln, the multiple heating flanges on the platinum discharge pipe are generally arranged axially at intervals from the position close to the bottom of the crucible kiln, which makes the lower end of the platinum stirring rod close to the position of the uppermost heating flange, since the heating flanges heat the platinum discharge pipe through electric current, the heating flanges close to the platinum stirring rod are prone to electric potential difference and form a loop in the glass liquid, which causes the glass liquid to be prone to bubbles, the bubbles affect the quality of the test formed glass, a large deviation of the quality of the test glass and the actual production glass occurs, and the judgment and analysis of the test results are affected. SUMMARY

[0004] In view of the above problems in the prior art, the utility model aims to provide a crucible kiln for glass manufacturing test, solve the technical problem that the glass liquid in the existing crucible kiln is prone to bubbles due to electric potential difference, and achieve the effects of reducing the deviation of the quality of the test and actual formed glass and improving the reliability of the test.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] The utility model provides a glass manufacturing test crucible kiln, which comprises a kiln body and a platinum discharge pipe, the bottom of the kiln body is provided with a discharge hole, one end of the platinum discharge pipe is opposite to the discharge hole and connected with the outer bottom surface of the kiln body; the platinum discharge pipe is provided with a first heating element, the first heating element is insulated from the platinum discharge pipe and arranged close to the bottom of the kiln body.

[0007] Further, the first heating element comprises an insulating sleeve, the insulating sleeve is sleeved on the platinum discharge pipe, and the insulating sleeve is provided with a first heating wire.

[0008] Further, the insulating sleeve is composed of two first ceramic pieces which are axially split and oppositely spliced, and the two first ceramic pieces are respectively provided with a first heating wire.

[0009] Further, the outer side surface of the first ceramic piece is axially and uniformly provided with a plurality of first wire grooves extending in the circumferential direction, and the outer side surface of the first ceramic piece is respectively provided with a first reversing groove close to the circumferential two ends, the first reversing groove extends axially and communicates with all the first wire grooves; the first heating wire is located in the first wire groove and the first reversing groove of the first ceramic piece, and in the axial direction of the insulating sleeve, the first heating wire alternately passes through the first wire groove and the first reversing groove.

[0010] Further, on the first ceramic piece, the first reversing groove is symmetrically arranged with respect to the axis of the insulating sleeve.

[0011] Further, the platinum discharge pipe is further provided with a plurality of heating flanges, the first heating element and the plurality of heating flanges are axially and spaced apart on the platinum discharge pipe, and the first heating element is close to the bottom of the kiln body.

[0012] Further, the outer bottom surface of the kiln body is insulated and provided with a second heating element.

[0013] Further, the second heating element comprises an insulating plate and a second heating wire, the insulating plate is connected to the outer bottom surface of the kiln body, the insulating plate is provided with a clearance hole for the platinum discharge pipe to pass through, and the second heating wire is arranged on the insulating plate.

[0014] Further, the insulating plate is composed of two second ceramic pieces which are axially split and oppositely spliced, the opposite ends of the two second ceramic pieces respectively have semicircular clearance notches, and the clearance notches on the two second ceramic pieces oppositely splice to form the clearance hole; the two second ceramic pieces are respectively provided with a second heating wire.

[0015] Further, the second ceramic sheet is provided with a plurality of second wiring grooves distributed along the radial direction of the kiln body on the side of the second ceramic sheet away from the kiln body, the second wiring grooves extend along the circumferential direction of the kiln body, and adjacent two second wiring grooves are communicated through a second commutation groove extending along the radial direction of the kiln body at the same end in the circumferential direction, and the two second commutation grooves communicated with the same second wiring groove are respectively located at the two ends of the second wiring groove in the circumferential direction; the second electric heating wire is located in the second wiring groove and the second commutation groove of the second ceramic sheet, and in the radial direction of the kiln body, the second electric heating wire alternately passes through the second wiring groove and the second commutation groove.

[0016] Further, the other end of the platinum gold discharge pipe is connected with a discharge nozzle.

[0017] Compared with the prior art, the utility model has the advantages of:

[0018] 1、the glass manufacturing test is used the crucible kiln of example, it is with existing crucible kiln closest to the heating flange of platinum gold discharge pipe on the bottom of crucible kiln is removed, and the part on platinum gold discharge pipe is wrapped with insulating sleeve, and the heating wire is arranged on the insulating sleeve and is used for heating and heat preservation of platinum gold discharge pipe, the current of electric heating wire does not act on platinum gold discharge pipe, even if the distance between electric heating wire and platinum stirring rod is close, and electric potential difference also does not form loop in glass liquid, is favorable for reducing the bubble quantity of glass liquid, can effectively solve the problem that glass liquid is easy to produce bubble due to electric potential difference in existing crucible kiln, makes the quality of glass obtained by test and actual production are more close, is favorable for improving the reliability of test.

[0019] 2、the glass manufacturing test is used the crucible kiln of example, and it is different from the heating element only acting on the side wall of existing crucible kiln, the second heating element is arranged on the outer bottom surface of crucible kiln, is used for keeping the temperature of the bottom of crucible kiln consistent with the temperature of the side, makes the temperature distribution of glass liquid in crucible kiln more uniform, is favorable for heating and bubble removal and reducing the generation of bubble, is also used for keeping the temperature of the bottom of crucible kiln higher than the upper limit of crystallization temperature of glass liquid, thereby preventing the generation of crystallization and affecting the quality of glass.

[0020] 3、the glass manufacturing test is used the crucible kiln of example, and the pipe section of discharge pipe close to the kiln body is heated by electric heating wire and insulating sleeve, under the premise of guaranteeing the heating and heat preservation effect, the amount of heating flange on platinum gold discharge pipe is reduced, and then the area of platinum gold discharge pipe direct heating by electrification is reduced, is favorable for reducing the loss speed of platinum gold discharge pipe, prolongs the service life. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structure schematic view of the glass manufacturing test crucible kiln of example described for example;

[0022] Figure 2a perspective view of the insulating sleeve according to the embodiment;

[0023] Figure 3 a perspective view of the insulating plate according to the embodiment;

[0024] Wherein, the kiln body 1, platinum discharge pipe 2, the first heating element 3, the insulating sleeve 4, the first ceramic piece 5, the first wiring groove 6, the first reversing groove 7, the heating flange 8, the second heating element 9, the insulating plate 10, the give hole 11, the second ceramic piece 12, the give gap 13, the second wiring groove 14, the second reversing groove 15, the discharge nozzle 16, platinum stirring rod 17. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0026] Embodiment:

[0027] Please see Figure 1 A glass manufacturing test crucible kiln, comprising a kiln body 1 and a platinum discharge pipe 2, the kiln body 1 bottom is provided with a discharge hole, and the platinum discharge pipe 2 is opposite to the discharge hole and connected with the outer bottom surface of the kiln body 1;The platinum discharge pipe 2 is provided with a first heating element 3, the first heating element 3 is insulated from the platinum discharge pipe 2, and is arranged close to the bottom of the kiln body 1.

[0028] The glass manufacturing test crucible kiln, wherein the platinum discharge pipe 2 is provided with a first heating element 3 close to the bottom of the crucible kiln, is used for heating the platinum discharge pipe 2, the first heating element 3 adopts an electric heating element insulated from the platinum discharge pipe 2, and the current of the electric heating element cannot act on the platinum discharge pipe 2;Even when the platinum stirring rod 17 is inserted into the kiln body 1 and keeps a close distance with the platinum stirring rod 17, no potential difference is generated between the platinum stirring rod 17 and the platinum discharge pipe 2, and no loop is formed in the glass liquid, so that the problem that the glass liquid is easy to generate bubbles due to the potential difference in the existing crucible kiln can be effectively solved, the number of bubbles generated in the glass liquid during the test can be reduced, the quality of the glass obtained by the test is more close to the actual production, and the reliability of the test is improved.

[0029] Please see Figure 1 And Figure 2 The first heating element 3 comprises an insulating sleeve 4, the insulating sleeve 4 is sleeved on the platinum discharge pipe 2, and the first electric heating wire (not shown in the figure) is arranged on the insulating sleeve 4.

[0030] In this way, the first heating wire is kept insulated from the platinum discharge pipe 2 by the insulating sleeve 4, so that the current does not act on the platinum discharge pipe 2, and the heat generated by the energization of the first heating wire is transmitted to the platinum discharge pipe 2 through the insulating sleeve 4 to maintain the temperature of the glass liquid in the platinum discharge pipe 2; the insulating sleeve 4 is made of high-temperature-resistant ceramic with excellent insulation and heat conduction performance.

[0031] Please refer to Figure 2 The insulating sleeve 4 is composed of two first ceramic pieces 5 split axially and spliced together, and the two first ceramic pieces 5 are respectively provided with first heating wires.

[0032] In this way, the insulating sleeve 4 is designed to be composed of two first ceramic pieces 5 split axially and spliced together, and the two first ceramic pieces 5 are respectively provided with first heating wires, so that the two first ceramic pieces 5 and the corresponding first heating wires form independent heating elements respectively, and the first heating element 3 does not need to be sleeved from one end of the platinum discharge pipe 2, which is not only convenient to install and adjust the position, but also simple to disassemble, maintain and replace, which is beneficial to improve the practicability; in implementation, adhesive or magnets can be applied to the opposite ends of the two first ceramic pieces 5 to splice and fix them, or high-temperature-resistant straps or clamps can be wound or arranged outside the two first ceramic pieces 5 to splice and fix them.

[0033] Please refer to Figure 2 The outer side surface of the first ceramic piece 5 is axially and uniformly provided with a plurality of first wire grooves 6 extending in the circumferential direction, and the outer side surface of the first ceramic piece 5 is respectively provided with first reversing grooves 7 near the circumferential two ends, and the first reversing grooves 7 axially extend and communicate with all the first wire grooves 6; the first heating wire is located in the first wire groove 6 and the first reversing groove 7 of the first ceramic piece 5, and in the axial direction of the insulating sleeve 4, the first heating wire alternately passes through the first wire groove 6 and the first reversing groove 7; in this embodiment, the first reversing grooves 7 are symmetrically arranged with respect to the axis of the insulating sleeve 4 on the first ceramic piece 5.

[0034] In this way, the first wire groove 6 and the first reversing groove 7 are arranged on the outer side surface of the first ceramic piece 5 to accommodate the first heating wire, which not only avoids the exposure of the first heating wire, but also avoids the short circuit of the first heating wire itself, which is beneficial to improve the safety and reliability in use, in addition, the first heating wire alternately passes through the first wire groove 6 and the first reversing groove 7 in the axial direction of the insulating sleeve 4, so that the first heating wire is more uniformly distributed on the first ceramic piece 5, thereby providing more uniform heating effect for the platinum discharge pipe 2.

[0035] Please refer to Figure 1 The platinum discharge pipe 2 is also provided with a plurality of heating flanges 8, the first heating element 3 and the plurality of heating flanges 8 are axially and spacedly arranged on the platinum discharge pipe 2, and the first heating element 3 is close to the bottom of the kiln body 1.

[0036] Thus, the first heating element 3 is used to heat the platinum discharge pipe 2 near the kiln body 1 to reduce the generation of bubbles in the glass liquid, and the existing heating flange 8 is used to heat between the discharge end of the platinum discharge pipe 2 and the first heating element 3, which not only reduces the cost and weight, but also facilitates the support and stability of the structure, and the temperature of the glass liquid can be controlled by the heating flange 8 to control the flow of the glass liquid output by the platinum discharge pipe 2.

[0037] The existing crucible kiln generally only has heating elements acting on the side wall, such as silicon-molybdenum rods or silicon-carbon rods distributed circumferentially outside the crucible kiln and arranged in the axial direction, which are used to heat and melt the glass production ingredients in the crucible kiln to form a glass liquid, and the bottom of the crucible kiln generally does not have heating elements, which causes the temperature of the central area of the bottom of the crucible kiln to be low, and the glass liquid with uneven temperature is prone to generate bubbles due to heating, and if the temperature of the bottom of the crucible kiln is low to the crystallization range of the glass liquid, crystals will be generated at the bottom of the crucible kiln and output through the platinum discharge pipe 2, thereby affecting the service life of the platinum discharge pipe 2 and the quality of the glass;

[0038] Please refer to Figure 1 Therefore, the second heating element 9 is covered and insulated on the outer bottom surface of the kiln body 1; in this way, the second heating element 9 not only keeps the temperature of the bottom of the crucible kiln consistent with the temperature of the side part, so that the temperature distribution of the glass liquid in the crucible kiln is more uniform, which is conducive to heating and bubble removal and reduces the generation of bubbles, but also keeps the temperature of the bottom of the crucible kiln higher than the upper limit of the crystallization temperature of the glass liquid, thereby preventing the crystallization from affecting the quality of the glass, making the quality of the glass obtained by the test more close to the actual production, and facilitating to improve the reliability of the test.

[0039] Please refer to Figure 1 and Figure 2 The second heating element 9 includes an insulating plate 10 and a second electric heating wire (not shown in the figure), the insulating plate 10 is connected to the outer bottom surface of the kiln body 1, the insulating plate 10 is provided with a through hole 11 for the platinum discharge pipe 2 to pass through, and the second electric heating wire is arranged on the insulating plate 10.

[0040] In this way, the second electric heating wire is insulated from the kiln body 1 by the insulating plate 10, so that the current does not act on the kiln body 1 to generate bubbles in the glass liquid inside the kiln body 1, and the heat generated by the second electric heating wire is transmitted to the bottom of the kiln body 1 through the insulating plate 10 to keep the temperature of the bottom of the crucible kiln consistent with the temperature of the side part, so that the glass liquid is uniformly distributed.

[0041] Please refer to Figure 2, the insulating plate 10 is composed of two second ceramic sheets 12 split in the axial direction and connected oppositely, the opposite ends of the two second ceramic sheets 12 are respectively provided with semicircular accommodation notches 13, and the accommodation notches 13 on the two second ceramic sheets 12 are oppositely connected to form the accommodation hole 11; and the two second ceramic sheets 12 are respectively provided with second heating wires.

[0042] In this way, the insulating plate 10 is designed to be composed of two second ceramic sheets 12 split in the axial direction and connected oppositely, and the two second ceramic sheets 12 are respectively provided with second heating wires, i.e. the two second ceramic sheets 12 and the corresponding second heating wires form independent heating elements respectively, and the accommodation hole 11 formed by the accommodation notches 13 avoids the platinum discharge pipe 2, and the two second ceramic sheets 12 do not need to be sleeved from one end of the platinum discharge pipe 2, which is convenient for installation and position adjustment, and is simple for disassembly, maintenance and replacement, and is beneficial to improve the practicability.

[0043] Please refer to Figure 1 and Figure 2 , the second ceramic sheet 12 is provided with a plurality of second wire grooves 14 distributed along the radial direction of the kiln body 1 on the side away from the kiln body 1, the second wire grooves 14 extend along the circumferential direction of the kiln body 1, and the adjacent two second wire grooves 14 at the same end in the circumferential direction are connected by the second reversing grooves 15 extending along the radial direction of the kiln body 1, and the two second reversing grooves 15 connected with the same second wire groove 14 are respectively located at the two ends of the second wire groove 14 in the circumferential direction; and the second heating wire is located in the second wire groove 14 and the second reversing groove 15 of the second ceramic sheet 12, and in the radial direction of the kiln body 1, the second heating wire alternately passes through the second wire groove 14 and the second reversing groove 15.

[0044] In this way, the second wire groove 14 and the second reversing groove 15 are arranged on the outer side of the second ceramic sheet 12 to accommodate the second heating wire, which can not only avoid the exposure of the second heating wire, but also avoid the short circuit of the second heating wire itself, and is beneficial to improve the safety and reliability in use, in addition, the second heating wire alternately passes through the second wire groove 14 and the second reversing groove 15 in the radial direction of the kiln body 1, so that the second heating wire is more uniformly distributed on the second ceramic sheet 12, thereby providing more uniform heating effect for the bottom of the kiln body 1.

[0045] Please refer to Figure 1 , the other end of the platinum discharge pipe 2 is connected with a discharge nozzle 16; in this way, the discharge nozzle 16 is arranged at the end of the platinum discharge pipe 2 away from the kiln body 1, so as to make the platinum discharge pipe 2 output the glass liquid more stably.

[0046] Finally, it needs to be explained that the above examples are only used to illustrate the technical solutions of the present application, but not to limit the technical solutions, and those of ordinary skill in the art should understand that those who modify or equivalently replace the technical solutions of the present application without departing from the purpose and scope of the present application should be covered in the scope of the claims of the present application.

Claims

1. A glass manufacturing test crucible furnace characterized by: The kiln body is provided with a discharge hole in the bottom, and the platinum discharge pipe is connected to the outer bottom surface of the kiln body.

2. The glass manufacturing test crucible furnace of claim 1, wherein: The first heating element comprises an insulating sleeve, which is sleeved on the platinum discharge pipe and is provided with a first electric heating wire.

3. The glass manufacturing test crucible furnace of claim 2, wherein: The insulating sleeve is composed of two first ceramic pieces which are axially split and oppositely spliced.

4. The glass manufacturing test crucible furnace of claim 3, wherein: The outer side surface of the first ceramic piece is axially and uniformly provided with a plurality of first wire grooves extending in the circumferential direction.

5. The glass manufacturing test crucible furnace of claim 1, wherein: The first ceramic piece is provided with a first reversing groove near each of the two circumferential ends of the outer side surface.

6. The glass manufacturing test crucible furnace of claim 1, wherein: The first electric heating wire is located in the first wire groove and the first reversing groove of the first ceramic piece.

7. The glass manufacturing test crucible furnace of claim 1, wherein: The first reversing groove is symmetrically arranged with respect to the axis of the insulating sleeve.

8. A glass manufacturing test crucible furnace as in claim 7, wherein: The platinum discharge pipe is further provided with a plurality of heating flanges.

9. A glass manufacturing test crucible furnace as in claim 8, wherein: The first heating element and the plurality of heating flanges are axially and spacedly distributed on the platinum discharge pipe, and the first heating element is close to the bottom of the kiln body.

10. The glass manufacturing test crucible furnace of claim 9, wherein: The outer bottom surface of the kiln body is insulated and provided with a second heating element.

11. The glass manufacturing test crucible furnace of claim 1, wherein: The second heating element comprises an insulating plate and a second electric heating wire. The insulating plate is connected to the outer bottom surface of the kiln body and is provided with a clearance hole for the platinum discharge pipe. The insulating plate is composed of two second ceramic pieces which are axially split and oppositely spliced. The two second ceramic pieces are provided with semicircular clearance notches at opposite ends, and the clearance notches of the two second ceramic pieces oppositely spliced form the clearance hole. The second ceramic piece is provided with a second electric heating wire. The second ceramic piece is provided with a second electric heating wire. The other end of the platinum discharge pipe is connected with a discharge nozzle.

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