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Glass tube secondary drawing apparatus and method thereof

A technology of glass tube and manufacturing method, which is applied in the field of glass tube secondary drawing device, can solve the problems that it is difficult to change glass types, and it is difficult to apply to prepare special glass tubes of many types and small batches, so as to facilitate the replacement of glass types and easy adjustment and the effect of controlling

Active Publication Date: 2018-09-11
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects that the glass tube mechanical drawing method in the prior art is not easy to change glass varieties, and is difficult to be suitable for preparing special glass tubes of many varieties and small batches, thereby providing a glass tube with two Secondary drawing device and method

Method used

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  • Glass tube secondary drawing apparatus and method thereof

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Experimental program
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Effect test

Embodiment 1

[0053] The glass tube secondary drawing device provided in this embodiment, such as figure 1 As shown, a feeding system is included to control the feeding speed and feeding verticality of the glass tube 7. The feeding system includes a feeding motor 5 that can be steplessly speed-regulated to control the feeding speed of the glass tube 7; a stabilizing ring 8 , used to adjust the feeding verticality of the glass tube 7 to ensure the straightness of the secondary drawn tube. The drawing system is used to heat and soften the glass tube 7 and draw it, including a heating furnace 9 and an annealing furnace 11, and the heating furnace 9 and the annealing furnace 11 are oppositely provided with through holes suitable for the passage of the glass tube 7 , the annealing furnace 11 is located below the heating furnace 9, and the setting of the annealing furnace 11 is to prevent bursting when drawing short-cut glass tubes through gradient cooling, so as to improve the yield; the mold 10...

Embodiment 2

[0063] This embodiment provides a glass tube secondary drawing method, using the glass tube secondary drawing device as described in Example 1, comprising the following steps:

[0064] Adopt the following weight percentage composition: 56.3% SiO 2 ; 13.9% ZrO 2 ; 8.9% CaO; 7.5% Na 2 O; 6.6% BaO; 4.3% B 2 o 3 ; 1.6% Al 2 o 3 and 0.9% MgO in a glass tube. Glass tube size is Φ 外 32×Φ 内 22×500mm, without defects such as bubbles, streaks and stones.

[0065] Put the glass tube 7 vertically into the heating furnace 9 through the feeding motor 5 and the stabilizing ring 8 for heat treatment. The heating rate in the heating furnace 9 is 0.3°C / min. The heat preservation temperature is 850±0.5°C, and the glass tube is kept vertical. The glass tube softens, first moves downward through its own gravity, and enters the annealing furnace 11 through the mold 10. The temperature of the annealing furnace 11 is 630°C. ≤10°C / cm. Then drawing is carried out under the action of the trac...

Embodiment 3

[0068] This embodiment provides a glass tube secondary drawing method, which uses the glass tube secondary drawing device as described in Example 1, comprising the following steps:

[0069] Adopt the following weight percentage composition: 56.3% SiO 2 ; 13.9% ZrO 2 ; 8.9% CaO; 7.5% Na 2 O; 6.6% BaO; 4.3% B 2 o 3 ; 1.6% Al 2 o 3 and 0.9% MgO in a glass tube. Glass tube size is Φ 外 64×Φ 内 45×500mm, without defects such as bubbles, streaks and stones.

[0070] Put the glass tube 7 vertically into the heating furnace 9 through the feeding motor 5 and the stabilizing ring 8 for heat treatment. The heating rate in the heating furnace 9 is 0.3°C / min. The heat preservation temperature is 900±0.5°C, and the glass tube is kept vertical. The glass tube softens, first moves downward through its own gravity, and enters the annealing furnace 11 through the mold 10. The temperature of the annealing furnace 11 is 630°C. ≤10°C / cm. Then drawing is carried out under the action of the...

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Abstract

The invention belongs to the technical field of special glass preparation and specifically relates to a glass tube secondary drawing apparatus and a method thereof. according to the drawing method, aglass tube is sent through a feed system into a heating furnace of a drawing system and is softened downwards under the action of gravity; the glass tube enters an annealing furnace through a mould and is drawn under the action of a tractor; the glass tube is sealed by a plugging structure, and pressure in the glass tube and the mould is controlled; by an online detection device, internal and external diameters of the secondary tube are detected on line; when the internal and external diameters of the secondary tube meet preset requirements, a tube cutter is started to cut off the secondary tube; the glass tube is sealed by a plugging structure and drawing continues; when the internal and external diameters of the secondary tube do not meet preset requirements, temperature of the heating furnace and drawing speed of the tractor are regulated until the internal and external diameters of the secondary tube meet the preset requirements. The size of the secondary tube drawn by the above method is easy to regulate and control, and glass varieties are convenient to replace. The apparatus and the method are suitable for multi-varieties and small-batch preparation of special glass tubes, preparation methods of glass tubes are enriched, and the operation is simple.

Description

technical field [0001] The invention belongs to the technical field of special glass preparation, and in particular relates to a glass tube secondary drawing device and method. Background technique [0002] Glass tube products are mainly produced by drawing methods, mainly including manual drawing and mechanical drawing. Manual drawing is mainly used for drawing glass tubes or glass rods in small batches. Manual drawing is to use manual blowing to draw tubes. The glass tubes prepared by this process have low dimensional accuracy, and poor linearity and batch stability, which cannot meet the needs of high-end applications. [0003] Machine drawing is to directly draw a glass tube from a glass furnace by machinery at high temperature. The process is complex and involves the control of parameters such as drawing temperature, gas pressure, drawing rate, product specifications, and glass material properties. These parameters interact. Mechanical drawing can be divided into two...

Claims

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Application Information

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IPC IPC(8): C03B23/047C03B25/00
CPCC03B23/047C03B25/00
Inventor 王衍行祖成奎张超许晓典殷先印
Owner CHINA BUILDING MATERIALS ACAD
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