阅读说明：本技术 玻璃管生产设备及玻璃管的制备方法 (Glass tube production equipment and preparation method of glass tube ) 是由 张烨锋 缪丙华 周进 徐金田 陈京京 于 2021-01-19 设计创作，主要内容包括：一种玻璃管生产设备,用于将中空的玻璃胚块加工成玻璃管,包括：炉体、端拉机构及侧拉机构,炉体包括炉壳及加热件,加热件设置于炉壳内,加热件用于升温玻璃胚块至熔融状态,熔融状态的玻璃胚块受重力拉长以形初加工玻璃管,炉壳开设有出料孔,出料孔用于允许初加工玻璃管伸出炉体；端拉机构包括导轨及滑块,滑块可活动地设置于导轨,导轨包括第一端及与第一端相对的第二端,第一端设置于出料孔的下方,滑块用于连接初加工玻璃管的端部并拉动端部背离炉体移动；侧拉机构包括牵引辊,设置于导轨的相对两侧,牵引辊用于抵压初加工玻璃管的侧部并拉动初加工玻璃管以形成玻璃管。另外,本申请还提供一种玻璃管的制备方法。(A glass tube manufacturing apparatus for processing a hollow glass preform into a glass tube, comprising: the furnace body comprises a furnace shell and a heating element, the heating element is arranged in the furnace shell and used for heating a glass billet to a molten state, the glass billet in the molten state is elongated by gravity to form a primary processing glass tube, and the furnace shell is provided with a discharge hole used for allowing the primary processing glass tube to extend out of the furnace body; the end pulling mechanism comprises a guide rail and a sliding block, the sliding block is movably arranged on the guide rail, the guide rail comprises a first end and a second end opposite to the first end, the first end is arranged below the discharge hole, and the sliding block is used for connecting the end part of the glass tube to be machined and pulling the end part to move away from the furnace body; the side pulling mechanism comprises pulling rollers which are arranged on two opposite sides of the guide rail, and the pulling rollers are used for abutting against the side part of the glass tube to be initially processed and pulling the glass tube to be initially processed to form the glass tube. In addition, the application also provides a preparation method of the glass tube.)

1. A glass tube production apparatus for processing a hollow glass preform into a glass tube, comprising:

the furnace body comprises a furnace shell and a heating element, the heating element is arranged in the furnace shell and is used for heating the glass blank block to a molten state, so that the glass blank block in the molten state is elongated under the action of gravity to form a primary processing glass tube, the furnace shell is provided with a discharge hole, and the discharge hole is used for allowing the primary processing glass tube to extend out of the furnace body;

the end pulling mechanism comprises a guide rail and a sliding block, the sliding block is movably arranged on the guide rail, the guide rail comprises a first end and a second end opposite to the first end, the first end is arranged below the discharge hole, and the sliding block is used for connecting the end part of the glass tube to be machined and pulling the end part to move away from the furnace body;

and the side pulling mechanism comprises pulling rollers, the pulling rollers are arranged on two opposite sides of the guide rail, and the pulling rollers are used for pulling the glass tube to be initially processed from two sides so as to form the glass tube.

2. The glass tube manufacturing apparatus of claim 1, further comprising a pressure control device and a diameter measuring member, wherein the pressure control device comprises a gas supply unit and a controller electrically connected to the gas supply unit, and the gas supply unit is configured to introduce gas into the glass preform;

the diameter measuring piece is arranged on the outer side of the furnace body and close to the discharge hole, and is used for measuring the pipe diameter value of the glass pipe;

the controller is used for adjusting the flow of the gas introduced into the gas supply unit according to the difference value between the pipe diameter value and the preset value.

3. The glass tube manufacturing apparatus as claimed in claim 2, wherein the pressure control device further includes a first pressure measuring device and a second pressure measuring device, the first pressure measuring device and the second pressure measuring device are electrically connected to the controller, the first pressure measuring device is used for measuring an internal pressure value inside the glass blank, the second pressure measuring device is disposed inside the furnace casing, the second pressure measuring device is used for measuring an external pressure value inside the glass blank, and the controller adjusts the flow rate of the gas introduced into the gas supply unit according to the internal pressure value and the external pressure value.

4. The glass tube manufacturing apparatus of claim 2, wherein the controller is further electrically coupled to the pull roll, the controller being further configured to adjust a rotational speed of the pull roll based on the difference.

5. The glass tube producing apparatus of claim 2, further comprising a positioning roller disposed between the caliper and the pulling roller, the positioning roller for limiting a drawing direction of the glass tube.

6. The glass tube production apparatus as claimed in claim 1, further comprising an upper hanger bar and a lower hanger bar, wherein the upper hanger bar is disposed on one side of the furnace body, the lower hanger bar is disposed on the other side of the furnace body, the upper hanger bar is used for connecting the glass blank, and the lower hanger bar is used for connecting the slider and the glass blank.

7. A method for manufacturing a glass tube, comprising the steps of:

providing the glass tube production apparatus as defined in any one of claims 1 to 5 and a hollow glass blank, disposing the glass blank in the furnace body;

heating the glass blank block to a molten state, wherein the molten glass blank block forms a primary processing glass tube under the action of gravity, and the primary processing glass tube is exposed out of the discharge hole;

connecting the slide block with the end part of the glass tube to be machined, and driving the glass tube to be machined to the traction roller by the slide block; and the number of the first and second groups,

and loosening the slide block and the rough glass tube, and drawing the rough glass tube from the side part of the rough glass tube by the drawing roller to form the glass tube.

8. The method of manufacturing a glass tube as claimed in claim 7, wherein the step of providing a hollow glass preform comprises:

providing a solid glass rod, and processing the solid glass rod to form the glass billet; and

and carrying out acid washing on the inner surface and the outer surface of the glass billet.

9. The method of manufacturing a glass tube as in claim 7, wherein the step of heating the glass preform to a molten state further comprises:

and the glass billet is connected with an upper end tail handle and a lower end tail handle, the upper end tail handle is used for connecting an upper suspender, and the lower end tail handle is used for connecting a lower suspender.

Technical Field

The application relates to the technical field of glass preparation, in particular to glass tube production equipment and a glass tube preparation method.

Background

Generally, the step of producing the glass tube comprises: the glass preform is heated to a temperature higher than the glass transition temperature of the glass preform to melt it, and then a glass tube is drawn from the molten glass preform in a vertical direction by a drawing device.

However, the change of the diameter of the glass tube cannot be effectively controlled, which easily causes low yield of quartz glass, and results in waste of raw materials and low output.

Disclosure of Invention

In view of the above, there is a need for a method for manufacturing a glass tube, so as to effectively control the diameter of the glass tube and improve the yield of the glass tube.

In addition, this application still provides a glass manages production facility that is used for the pipe diameter of effective control glass pipe, improves the yield of glass pipe.

A glass tube manufacturing apparatus for processing a hollow glass preform into a glass tube, comprising: furnace body, end draw mechanism and side draw mechanism. The furnace body includes stove outer covering and heating member, and the heating member sets up in the stove outer covering, and the heating member is used for rising temperature glass billet to molten state, and molten state's glass billet receives gravity to stretch with shape just processing glass pipe, and the discharge opening has been seted up to the stove outer covering, and the discharge opening is used for allowing just processing glass pipe to stretch out the furnace body. The end pulling mechanism comprises a guide rail and a sliding block, the sliding block is movably arranged on the guide rail, the guide rail comprises a first end and a second end opposite to the first end, the first end is arranged below the discharge hole, and the sliding block is used for connecting the end part of the glass tube to be initially processed and pulling the end part to deviate from the furnace body to move. The side pulling mechanism comprises pulling rollers which are arranged on two opposite sides of the guide rail, and the pulling rollers are used for abutting against the side part of the glass tube to be initially processed and pulling the glass tube to be initially processed to form the glass tube.

A method for preparing a glass tube, comprising the steps of: the glass tube production equipment and the hollow glass blank are provided, and the glass blank is arranged in the furnace body.

And heating the glass billet to a molten state, wherein the molten glass billet is subjected to the action of gravity to form a primary processing glass tube, and the primary processing glass tube is exposed out of the discharge hole.

And connecting the slide block and the end part of the glass tube to be machined, driving the glass tube to be machined to the traction roller by the slide block, and disconnecting the slide block and the glass tube to be machined, and drawing the glass tube to be machined from the side part of the glass tube to be machined by the traction roller to form the glass tube.

The application provides a glass manages production facility passes through the end is drawn the mechanism and is stretched just to the preliminary working glass pipe the mechanism is drawn to the side, then by the side is drawn the mechanism and will just processing glass pipe is stretched to the glass pipe, can show the interior external diameter fluctuation and the bow degree etc. that improve the glass pipe initial segment to improve the bulk utilization of glass embryo piece, practiced thrift manufacturing cost.

Drawings

FIG. 1 is a schematic view of a glass tube production apparatus provided in an embodiment of the present application.

Fig. 2 is a flowchart of a method for manufacturing a glass tube according to an embodiment of the present disclosure.

Description of the main elements

Glass tube production apparatus 100

Furnace body 10

Furnace shell 11

Discharge hole 111

Heating element 12

End pull mechanism 20

Slider 22

Side pulling mechanism 30

Traction roller 31

Pressure control device 40

Controller 42

First pressure measuring piece 43

Second pressure measuring piece 44

Caliper 50

Positioning roller 60

Glass blank 200

The glass tube 201 is initially processed

Upper end tail handle 205

Lower end tail handle 207

Detailed Description

In order that the above objects, features and advantages of the embodiments of the present application can be more clearly understood, a detailed description of the present application will be given below with reference to the accompanying drawings and detailed description. In addition, the features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth to provide a thorough understanding of embodiments of the application, and the described embodiments are merely a subset of embodiments of the application, rather than all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this application belong. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application.

Referring to fig. 1, an embodiment of the present invention provides a glass tube production apparatus 100, configured to process a hollow glass blank 200 into a glass tube (not shown), where the glass tube production apparatus 100 includes a furnace body 10, an end pulling mechanism 20, and a side pulling mechanism 30, the furnace body 10 includes a furnace shell 11 and a heating element 12, the heating element 12 is disposed in the furnace shell 11, the heating element 12 is configured to heat the glass blank 200 to a molten state, the glass blank in the molten state is elongated by self-weight to form a primary processed glass tube 201, the furnace shell 11 is provided with a discharge hole 111, and the discharge hole 111 is configured to allow the primary processed glass tube 201 to extend out of the furnace body 10, where the furnace body 10 may be a graphite furnace or an induction furnace.

The end pulling mechanism 20 includes a guide rail (not shown) and a slider 22, the guide rail includes a first end and a second end (not shown) opposite to the first end (not shown), the first end is disposed below the discharging hole 111, the slider 22 is movably disposed on the guide rail, the slider 22 can be connected to an end portion (not shown) of the glass tube 201 to be processed, and the slider 22 pulls the end portion to move away from the furnace body 10.

The side-pulling mechanism 30 includes a pair of pulling rolls 31 and a pulling roll driver (not shown), the pulling rolls 31 are disposed on two opposite sides of the guiding rail, the pulling roll driver is connected to the pulling rolls 31, and the pulling rolls 31 are used for stretching the glass tube 201 from the side of the glass tube 201 to form the glass tube.

Specifically, when the glass tube production apparatus 100 is used, first, a hollow glass blank 200 is provided, then the hollow glass blank 200 is placed in the furnace body 10, the furnace body 10 heats the hollow glass blank 200 to a molten state (i.e., a glass state), the hollow glass blank 200 in the molten state is softened and subjected to self-weight to form the glass tube 201, and the glass tube 201 is exposed from the discharge hole 111.

Next, the slider 22 is moved to the vicinity of the discharge hole 111 and connected to the end of the preform glass tube 201. The slide block 22 pulls the glass tube 201 to move slowly towards the direction far away from the furnace body 10, and the diameter R of the glass tube 201 becomes smaller.

Finally, when the slider 22 moves to a position corresponding to the drawing roller 31, the slider 22 and the glass tube 201 are cut, the drawing roller 31 draws the glass tube 201 from the side of the glass tube 201, and the diameter R of the glass tube 201 is further reduced to finally form the glass tube. Compare in the drawing technique of current glass pipe, this application is through setting up end draw mechanism 20 makes just the entering under end draw mechanism 20's traction of primary processing glass pipe 201 side draw mechanism 30 to avoid being got into by primary processing glass pipe 201 by the action of gravity the size and the wall thickness that side draw mechanism 30 leads to are uneven, thereby improved the yield of glass billet 200, reduce raw and other materials extravagant.

In this embodiment, the glass tube manufacturing apparatus 100 further includes a pressure control device (not shown) and a diameter measuring unit 50, wherein the pressure control device 40 includes an air supply unit (not shown) and a controller 42 electrically connected to the air supply unit, the air supply unit is used for introducing gas, which is inert gas or compressed air, into the hollow glass blank 200. The diameter measuring piece 50 is arranged at the outer side of the furnace body 10 adjacent to the discharge hole 111, and the diameter measuring piece 50 is used for measuring the pipe diameter R of the glass pipe.

The controller 42 adjusts the flow rate of the gas introduced into the gas supply unit according to the difference between the pipe diameter R measured by the diameter measuring piece 50 and a preset value. Specifically, when the diameter measuring unit 50 measures that the pipe diameter R of the glass pipe is greater than the preset value (i.e., the pipe diameter R is larger), the controller 42 controls the gas supply unit to reduce the flow of gas, so that the pressure inside the glass pipe is reduced, and the traction speed of the traction roller 31 is not changed, the reduction of the internal pressure of the glass pipe is beneficial to the reduction of the pipe diameter R of the glass pipe, so that the difference between the pipe diameter R and the preset value is reduced, and the pipe diameter R of the glass pipe is effectively controlled.

In this embodiment, the pressure control device 40 further includes a first pressure measuring device 43 and a second pressure measuring device 44, the first pressure measuring device 43 and the second pressure measuring device 44 are electrically connected to the controller 42, the first pressure measuring device 43 is used for measuring an internal pressure value inside the glass blank 200, the second pressure measuring device 44 is disposed inside the furnace shell 11, and the second pressure measuring device 44 is used for measuring an external pressure value inside the glass blank 200.

The controller 42 adjusts the flow rate of the gas introduced into the gas supply unit according to the internal pressure value and the external pressure value. Specifically, when the difference between the internal pressure value and the external pressure value is greater than a preset value, the controller 42 controls the gas supply unit to reduce the flow of the gas, so as to facilitate the reduction of the pipe diameter R of the glass pipe, and when the difference between the internal pressure value and the external pressure value is less than the preset value, the controller 42 controls the gas supply unit to increase the flow of the gas, so as to facilitate the increase of the pipe diameter R of the glass pipe, so as to effectively control the pipe diameter R of the glass pipe.

In this embodiment, the controller 42 is further electrically connected to the pull roll driver, and the controller 42 adjusts the rotation speed of the pull roll driver according to the difference between the pipe diameter R and the preset value.

In this embodiment, the glass tube manufacturing apparatus 100 further includes a positioning roller 60, the positioning roller 60 is disposed between the diameter measuring member 50 and the pulling roller 31, and the positioning roller 60 is used for limiting the stretching direction of the glass tube.

In this embodiment, the glass tube manufacturing apparatus 100 further includes an upper hanger (not shown) and a lower hanger (not shown), the upper hanger is disposed on one side of the furnace body 10, the lower hanger is disposed on the other side of the furnace body 10, the upper hanger is used for hanging the glass blank 200, and the lower hanger is used for connecting the slide block 22 and the glass blank 200.

The method for producing a glass tube provided in an embodiment of the present application will be specifically described below with reference to the above-described glass tube production apparatus 100. The order of the steps of the preparation method can be changed according to different requirements, and certain steps can be omitted or combined. Referring to fig. 2, the preparation method comprises the following steps:

s1, providing a hollow glass blank 200, and placing the hollow glass blank 200 in the furnace body 10, wherein the glass blank 200 may be a quartz glass blank.

In the present embodiment, step S1 includes:

s10, processing the solid glass rod to form a hollow glass billet 200, which specifically comprises: the glass rod is horizontally clamped and fixed through a clamp, the extrusion die head containing a piston is utilized, the extrusion die head can comprise a mandrel, a channel is formed in the glass rod in a drilling mode, then the outer surface of the glass rod is processed in a grinding mode, and the size of the inner diameter and the outer diameter of the glass billet required by the formation of the target glass tube is achieved. For example, the outer diameter is usually 50 to 150mm, the inner diameter of the glass preform 200 varies depending on the outer diameter of the glass preform 200, the inner hole diameter of the glass preform 200 is 40 to 120mm, and the length of the glass preform 200 is 1 to 2 mm.

S12, performing acid cleaning on the inner surface and the outer surface of the glass blank 200, and then placing the glass blank in a wind showering box for blowing and air drying for later use.

S2, heating the glass billet 200 to a molten state, wherein the molten glass billet forms a primary processing glass tube 201 under the action of gravity, and the primary processing glass tube 201 is exposed from the discharge hole 111;

in the present embodiment, step S2 includes:

s20, butting the glass blank 200 and the upper end tail handle 205, and specifically comprising: one end of the upper end tail handle 205 is butted with the glass blank 200 by torch flame processing or other means, and the length of the upper end tail handle can be 1-1.5mm or even longer. The upper end tail 205 also includes a passage that functions as a conduit through which pressurized gas is supplied to the interior of the glass blank 200; in addition, the other end of the upper end shank 205 is used to hang from an upper boom.

S21, butting the glass blank 200 and the lower end tail handle 207, and specifically comprising: and (3) butting one end of the lower end tail handle 207 with the glass billet 200 by adopting a same flame butting mode, wherein the length of the lower end tail handle 207 is about 500-1000 m. The lower end tail handle 205 is also hollow for pressurized gas to pass through, and the other end of the lower end tail handle 207 is used for connecting the lower suspension rod.

In the present embodiment, step S2 includes:

s22, vertically hanging the butted glass billet 200 in the furnace body 10, connecting part of the upper end tail handle 205 with the upper suspension rod, then lowering the glass billet 200 to the center of the furnace body 10 at the drawing starting position, and butting the lower end tail handle 207 with the lower suspension rod;

s23, starting the gas supply unit, wherein the gas supply unit supplies gas to the upper end tail handle 205, the gas then enters the glass billet 200, starting the heating element 12, heating the furnace body 10 to 1700-2000 ℃, and heating and softening the glass billet 200;

and S3, connecting the slide block 22 and the end part of the primary processing glass tube 201, driving the primary processing glass tube 201 to the drawing roller 31 by the slide block 22, disconnecting the slide block 22 and the primary processing glass tube 201, and drawing the primary processing glass tube 201 from the side part of the primary processing glass tube 201 by the drawing roller 31 to form the glass tube.

In the present embodiment, step S3 includes:

and S30, the controller 42 adjusts the flow rate of the gas introduced into the gas supply unit according to the difference between the pipe diameter R measured by the diameter measuring piece 50 and a preset value. Specifically, when the difference between the internal pressure value and the external pressure value is greater than a preset value, the controller 42 controls the gas supply unit to reduce the flow of the gas, so as to facilitate the reduction of the pipe diameter R of the glass pipe, and when the difference between the internal pressure value and the external pressure value is less than the preset value, the controller 42 controls the gas supply unit to increase the flow of the gas, so as to facilitate the increase of the pipe diameter R of the glass pipe, so as to effectively control the pipe diameter R of the glass pipe.

And S31, the controller 42 adjusts the flow rate of the gas introduced into the gas supply unit according to the internal pressure value and the external pressure value. Specifically, when the difference between the internal pressure value and the external pressure value is greater than a preset value, the controller 42 controls the gas supply unit to reduce the flow of the gas, so as to facilitate the reduction of the pipe diameter R of the glass pipe, and when the difference between the internal pressure value and the external pressure value is less than the preset value, the controller 42 controls the gas supply unit to increase the flow of the gas, so as to facilitate the increase of the pipe diameter R of the glass pipe, so as to effectively control the pipe diameter R of the glass pipe.

In this embodiment, the preparation method further includes the steps of:

and S4, cutting the glass tube to obtain glass products (not shown), specifically, cutting the glass products at equal intervals by using a laser cutting device, then clamping and breaking the glass tubes by using a mechanical arm, controlling the separated glass tubes by a computer program, and grabbing and placing the glass tubes into a glass tube conveying device according to a set action, thereby reducing the degree of manual intervention.

And S5, performing end face treatment, acid washing and drying and geometric parameter detection on the glass product.

Examples of the production method of the glass tube of the present application and geometric indexes of the glass tube produced by the production method, including an outer diameter, an inner diameter, a wall thickness, a curvature, an ovality, and a maximum wall displacement, are illustrated below.

[ example 1 ]

An upper end tail handle 205 and a lower end tail handle 207 are butted at both ends of a glass blank 200a with an outer diameter of 105mm and an inner diameter of 85mm by flame processing or other means. The upper end tail handle 205 is connected with the upper suspension rod of the glass tube production apparatus 100, the glass blank 200 is adjusted to the central position of the furnace body 10, the lower end tail handle 207 is connected with the slide block 22, and the gas supply unit is started to introduce gas into the glass blank 200.

Heating the high-temperature furnace to 1850-1900 ℃ to enable the glass blank to reach a molten state, feeding the glass blank into the furnace body 10 at a speed of 5mm/mim, firstly drawing the glass blank 200 by using a slide block 22 to obtain a primary glass tube 201a until the glass tube is stretched onto a drawing roller 31, then drawing the primary glass tube 201 by using the drawing roller 31, and then carrying out equidistant laser cutting according to the length of the required glass tube, wherein a mechanical arm is used for carrying out clamping, cutting and breaking operation in the process to finally obtain the glass tube a with the target outer diameter of 32mm and the target inner diameter of 26mm, and the actual measurement value is shown in table I.

Table one:

[ example 2 ]

An upper end tail handle 205 and a lower end tail handle 207 are butted at both ends of the glass blank 200b with the outer diameter of 98mm and the inner diameter of 85mm by flame processing or other means. The upper end tail handle 205 is connected with the upper suspension rod of the glass tube production apparatus 100, the glass blank 200 is adjusted to the central position of the furnace body 10, the lower end tail handle 207 is connected with the slide block 22, and the gas supply unit is started to introduce gas into the glass blank 200.

Heating the high-temperature furnace to 1800-.

Table two:

[ example 3 ]

The upper end tail handle 205 and the lower end tail handle 207 are butted at both ends of the glass blank 200c with the outer diameter of 95mm and the inner diameter of 80mm by flame processing or other means. The upper end tail handle 205 is connected with the upper suspension rod of the glass tube production apparatus 100, the glass blank 200 is adjusted to the central position of the furnace body 10, the lower end tail handle 207 is connected with the slide block 22, and the gas supply unit is started to introduce gas into the glass blank 200.

Heating a high-temperature furnace to 1760-1800 ℃ to enable the glass blank to reach a molten state, feeding the glass blank into the furnace body 10 at a speed of 10mm/mim, drawing the glass blank 200 by using a slide block 22 to obtain a primary glass tube 201c until the glass tube is stretched onto a drawing roller 31, drawing the primary glass tube 201 by using the drawing roller 31, and performing equidistant laser cutting according to the length of the required glass tube, wherein a mechanical arm is used for clamping, cutting and breaking to obtain the glass tube c with the target outer diameter of 25mm and the target inner diameter of 21mm, and the actual measurement value is shown in table three.

Table three:

comparative example 1

An upper end tail handle 205 and a lower end tail handle 207 are butted to both ends of a glass blank 200d having an outer diameter of 105mm and an inner diameter of 85mm by flame processing or other means. The upper end tail handle 205 is connected with the upper suspension rod of the glass tube production apparatus 100, the glass blank 200 is adjusted to the central position of the furnace body 10, the lower end tail handle 207 is connected with the slide block 22, and the gas supply unit is started to introduce gas into the glass blank 200.

And (3) heating the high-temperature furnace to 1760-1800 ℃ to enable the glass blank to reach a molten state, feeding the glass blank into the furnace body 10 at a speed of 10mm/mim, starting to vertically expand downwards under the action of gravity on the molten part at the lower end of the glass blank 200d until the glass blank falls onto a drawing roller below the device (the distance between the center of the high-temperature furnace and the drawing roller at the lower part is about 1000mm), and drawing by the linear speed provided by the rotation of the drawing roller.

Cutting and knocking are carried out in sections according to the length of the required glass tube, and the glass tube is transported by an operator; finally, the glass tube with the target outer diameter of 32mm and the inner diameter of 26mm is obtained, and the part falling by the action of gravity, namely the ratio of the inner diameter to the outer diameter of the initial end part of the glass tube/fluctuation is abnormal, so that the technical conditions cannot be met, and the actual measurement values are as follows, and are shown in the table IV.

Table four:

by analyzing examples 1 to 3 and comparative example 1, it was found that by drawing the glass tube to be preliminarily processed to the side drawing mechanism by the end drawing mechanism and then drawing the glass tube to be processed to a glass tube by the side drawing mechanism, the fluctuation of the inner and outer diameters, the bow degree and the like of the initial section of the glass tube can be remarkably improved, thereby improving the overall utilization rate of the glass blank block and saving the production cost.

Although the embodiments of the present application have been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the embodiments of the present application.