A quartz glass tube drawing on-line wall deviation and ovality detection device and method

Abstract

This application provides an online device and method for detecting the wall eccentricity and ellipticity of drawn quartz glass tubes, relating to the field of quartz glass tube testing technology. The device includes a support body adjacent to the tube outlet end of a heating furnace; a diameter measuring component on the support body, having two pairs of diameter measuring ends distributed circumferentially along the formed tube; a thickness measuring component on the support body, located on the side of the diameter measuring component away from the heating furnace; the thickness measuring component includes two thickness measuring ends located on an extension line parallel to the radial direction of the formed tube; and a control unit within the support body, used to control the two pairs of diameter measuring ends to simultaneously measure the outer diameter values ​​of the formed tube in two mutually perpendicular directions, and to control the two thickness measuring ends to simultaneously measure the wall thickness values ​​on opposite sides of the formed tube, and to calculate the real-time ellipticity value and real-time wall eccentricity value of the formed tube based on the outer diameter value and wall thickness value. This method avoids the high difficulty and risk of manual operation under high-temperature conditions and solves the problem of large-volume scrap caused by the lag in traditional testing quality feedback.

Description

Technical Field

[0001] This application generally relates to the field of quartz glass tube testing technology, and specifically to a device and method for online detection of wall deviation and ellipticity of quartz glass tubes during drawing. Background Technology

[0002] In the production of quartz glass tubes, quality monitoring typically relies on a combination of manual and offline inspection. Traditional equipment can only inspect the average outer diameter and wall thickness of the formed tubes online. The ovality of the formed tubes requires manual sampling by operators near the high-temperature furnace opening, which is a harsh and risky process. The wall deviation of the formed tubes must be measured offline by a specialized tube measuring machine after the product has cooled and been cut. This inspection method results in a significant delay in quality feedback. Once defective products are discovered, a large number of scraps are often generated, leading to a waste of raw materials and energy, as well as creating significant quality risks and cost pressures in the production process. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide an online wall deviation and ellipticity detection device and method for drawing quartz glass tubes to improve the quality of finished products and reduce production costs.

[0004] In a first aspect, this application provides an online device for detecting the wall deviation and ellipticity of drawn quartz glass tubes, comprising: A support body is provided, which is adjacent to the outlet end of the heating furnace; the support body is provided with a diameter measuring component, which has two pairs of diameter measuring ends distributed along the circumference of the forming tube, for simultaneously measuring the outer diameter values ​​of the forming tube in two mutually perpendicular directions; A thickness measuring component is disposed on the support body and located on the side of the diameter measuring component away from the heating furnace; the thickness measuring component includes two thickness measuring ends located on an extension line parallel to the radial direction of the forming tube, for simultaneously measuring the wall thickness value on the opposite side of the forming tube; A control unit is disposed within the support body and is communicatively connected to the diameter measuring component and the thickness measuring component. The control unit is at least used to control the two pairs of diameter measuring ends to simultaneously measure the outer diameter values ​​of the formed tube in two mutually perpendicular directions during the drawing process, and to control the two thickness measuring ends to simultaneously measure the wall thickness values ​​on opposite sides of the formed tube, and to calculate the real-time ellipticity value and real-time wall deviation value of the formed tube based on the outer diameter value and the wall thickness value.

[0005] According to the technical solution provided in this application, the supporting entity includes: A first support structure and a second support structure are arranged adjacent to each other, with the first support structure positioned closer to the heating furnace than the second support structure. The first support structure is used to install the diameter measuring component. The second support structure is provided with two support wheels and two traction wheels, with the support wheels positioned closer to the first support structure than the traction wheels. The two support wheels are connected one-to-one to the two thickness measuring ends of the thickness measuring component, and the two support wheels are used to always adhere to and support the outer wall of the formed tube during the drawing process.

[0006] According to the technical solution provided in this application, a V-shaped groove is provided on the trolley, and the groove wall of the V-shaped groove abuts against the outer wall of the forming tube.

[0007] According to the technical solution provided in this application, the diameter measuring component includes two pairs of diameter measuring instruments, which are slidably connected to the support body, and the measuring end of the diameter measuring instrument is the diameter measuring end.

[0008] According to the technical solution provided in this application, the outer wall of the thickness measuring component is provided with a hot water insulated jacket.

[0009] According to the technical solution provided in this application, the two trolleys and the two traction wheels are connected to the second support structure through a synchronous opening and closing structure, which is used to drive the two trolleys and the two traction wheels to move synchronously.

[0010] According to the technical solution provided in this application, the control unit includes: A data acquisition module is used to receive the outer diameter value measured by the diameter measuring component and the wall thickness value measured by the thickness measuring component. The data processing module is used to calculate the real-time ellipticity value of the formed tube based on the outer diameter value measured by the diameter measuring component, and to calculate the real-time wall deviation value of the formed tube based on the wall thickness value measured by the thickness measuring component.

[0011] Secondly, this application provides a method for online detection of wall deviation and ellipticity in the drawing of quartz glass tubes, comprising the following steps: Step S10: Move the two support wheels and two traction wheels by synchronous opening and closing structure until the clamping centers of the two support wheels and the clamping centers of the two traction wheels are aligned with the outlet end of the heating furnace. Then start the detection device and use the two traction wheels to move the forming tube at the target traction speed. Step S20: Simultaneously measure the outer diameter of the formed tube in two mutually perpendicular directions using the diameter measuring component, and simultaneously measure the wall thickness of the formed tube on the opposite side using the thickness measuring component. Step S30: Calculate the real-time ellipticity value of the formed tube based on the outer diameter value, and calculate the real-time wall deviation value of the formed tube based on the wall thickness value.

[0012] According to the technical solution provided in this application, the following steps are also included: After driving the diameter measuring component to rotate by a preset angle, repeat steps S20 and S30 to obtain multiple sets of real-time ellipticity values ​​and real-time wall deviation values. If the real-time ellipticity value and real-time wall deviation value of the continuous preset group are both within the target fluctuation range, then the current pulling operation is determined to be in normal operation.

[0013] According to the technical solution provided in this application, the following steps are also included: Based on the target traction speed of the formed tube, the wall thickness value measured by the thickness measuring component is timestamped to align it with the outer diameter value measured by the diameter measuring component of the same cross section in time. Based on the aligned outer diameter value and wall thickness value, the real-time wall deviation value and real-time ellipticity value of the cross section are calculated.

[0014] As can be seen from the above technical solution, this application has at least the following beneficial effects: This application provides an online wall deviation and ellipticity detection device for drawing quartz glass tubes, comprising: a support body, the support body being adjacent to the tube outlet end of a heating furnace; a diameter measuring component on the support body, the diameter measuring component having two pairs of diameter measuring ends distributed along the circumference of the formed tube, used to simultaneously measure the outer diameter values ​​of the formed tube in two mutually perpendicular directions; a thickness measuring component, the thickness measuring component being disposed on the support body and located on the side of the diameter measuring component away from the heating furnace; the thickness measuring component including two thickness measuring ends located on an extension line parallel to the radial direction of the formed tube, used to simultaneously measure the wall thickness value on the opposite side of the formed tube; and a control unit, the control unit being disposed within the support body, the control unit being communicatively connected to the diameter measuring component and the thickness measuring component, the control unit being used at least during the drawing process to control the two pairs of diameter measuring ends to simultaneously measure the outer diameter values ​​of the formed tube in two mutually perpendicular directions, and to control the two thickness measuring ends to simultaneously measure the wall thickness value on the opposite side of the formed tube, and to calculate the real-time ellipticity value and real-time wall deviation value of the formed tube based on the outer diameter value and the wall thickness value.

[0015] This application, by arranging the support body adjacent to the outlet end of the heating furnace, utilizes two pairs of measuring ends of the diameter measuring component to simultaneously measure the outer diameter values ​​of the formed tube in two mutually perpendicular directions. Simultaneously, the two measuring ends of the thickness measuring component can simultaneously measure the wall thickness value on the opposite side of the formed tube. The control unit within the support body then calculates the real-time ellipticity and wall deviation values ​​of the formed tube based on the outer diameter and wall thickness values. This online inspection method changes the traditional inspection model where ellipticity requires manual sampling at the high-temperature furnace opening, and wall deviation requires offline measurement after product cooling and cutting. It avoids the high difficulty and risk of manual operation in high-temperature environments and solves the problem of large-scale scrap caused by delayed quality feedback in traditional inspections. Furthermore, the real-time data acquisition allows operators to adjust production process parameters promptly, reducing quality defects at the source, effectively improving the quality of finished quartz glass tubes, reducing raw material and energy waste and production costs, and eliminating potential quality hazards in the production process. Attached Figure Description

[0016] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0017] Figure 1 A structural diagram of an online eccentricity and ellipticity detection device for drawing quartz glass tubes.

[0018] Figure 2 This is a cross-sectional view of the supporting structure.

[0019] Figure 3 This is a schematic diagram of a V-groove.

[0020] Figure 4 This is a structural diagram of the control unit.

[0021] Figure 5 A flowchart for an online method to detect the wall deviation and ellipticity of quartz glass tubes during drawing.

[0022] Figure 6 This is a structural diagram of the insulated water jacket.

[0023] Figure 7 This is a cross-sectional view of the insulated water jacket.

[0024] The following are the labels in the diagram: 1. Heating furnace; 2. Forming tube; 3. First support structure; 4. Second support structure; 5. Rotary wheel; 6. Traction wheel; 7. V-groove; 8. Diameter gauge; 9. Thickness gauge; 10. Data acquisition module; 11. Data processing module; 12. Feeding device; 13. Quartz mother rod; 14. Insulating water jacket; 15. Quartz glass sheet; 16. Air-cooled structure. Detailed Implementation

[0025] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] like Figure 1 As shown, this application provides an online device for detecting the wall deviation and ellipticity of drawn quartz glass tubes, comprising: The support body is arranged adjacent to the outlet end of the heating furnace 1; the support body is equipped with a diameter measuring component, which has two pairs of diameter measuring ends distributed along the circumference of the forming tube 2, for simultaneously measuring the outer diameter values ​​of the forming tube 2 in two mutually perpendicular directions. The thickness measuring component is mounted on the support body and located on the side of the diameter measuring component away from the heating furnace 1. The thickness measuring component includes two thickness measuring ends located on an extension line parallel to the radial direction of the forming tube 2, which are used to simultaneously measure the wall thickness value on the opposite side of the forming tube 2. The control unit is located inside the support body and is communicatively connected to the diameter measuring component and the thickness measuring component. The control unit is used at least during the drawing process to control the two pairs of diameter measuring ends to simultaneously measure the outer diameter values ​​of the formed tube 2 in two mutually perpendicular directions, and to control the two thickness measuring ends to simultaneously measure the wall thickness values ​​of the opposite side of the formed tube 2, and to calculate the real-time ellipticity value and real-time wall deviation value of the formed tube 2 based on the outer diameter value and the wall thickness value.

[0028] The drawing of quartz glass tubes is a precision thermoforming process based on their high-temperature softening properties. It is usually carried out using a vertical downward drawing method. The process begins by feeding a solid quartz mother rod 13 from top to bottom into a heating furnace 1 using a feeding device 12. The bottom of the mother rod is melted at a temperature exceeding 1700°C to form a viscous bubble. Then, compressed air is blown into the center of the bubble. By coordinating the feeding speed, traction speed, and the air blown into the center, the molten mother rod is formed into a tubular prototype. As the tubular prototype is held and pulled down at a uniform speed by a pair of high-speed rotating traction wheels 6 below, the outer diameter and wall thickness of the tube are directly controlled and formed by coordinating the traction speed and gas pressure. The tube gradually cools and solidifies as it continues to descend, finally yielding the finished quartz glass tube, i.e., the formed tube 2.

[0029] Heating furnace 1 is a quartz glass tube forming device, used to heat and soften quartz mother rod 13 and then draw it into a formed tube 2, which is output from the tube outlet end of heating furnace 1. The support body serves as the basic load-bearing structure of this device and is used to install all detection components; the support body is arranged adjacent to the tube outlet end of heating furnace 1 to facilitate the entry of the formed tube 2 into the detection range of this device.

[0030] The diameter measuring assembly has two pairs of measuring ends distributed circumferentially along the forming tube 2. Each measuring end is a probe used to measure the outer diameter of the forming tube 2. The two pairs of measuring ends can be set perpendicular to each other. By measuring the outer diameter of the forming tube 2 through these two pairs of measuring ends, two perpendicular outer diameter values ​​are obtained. The control unit then calculates the difference between the two outer diameter values ​​and uses this as the current ellipticity value of the forming tube 2, i.e., the real-time ellipticity value. The thickness measuring assembly includes two thickness measuring ends, which are probes used to measure the wall thickness of the forming tube 2. The two thickness measuring ends are located on radially parallel extensions of the forming tube 2, i.e., on both sides of the forming tube 2. The line connecting the two ends is set perpendicular to the axis of the forming tube 2, so that the two thickness measuring ends can measure the opposite wall thickness value at the same cross-sectional position of the forming tube 2. The control unit then calculates the difference between the two wall thickness values ​​and uses this as the current wall thickness deviation value of the forming tube 2, i.e., the real-time wall thickness deviation value.

[0031] The control unit is installed inside the support body. It calculates the real-time ellipticity value of the formed tube 2 based on two outer diameter values ​​and the real-time wall thickness deviation value based on two wall thickness values. This online detection method changes the traditional detection method where ellipticity requires manual sampling at the high-temperature furnace opening and wall thickness deviation requires offline measurement after product cooling and cutting. It avoids the high difficulty and risk of manual operation in high-temperature environments and solves the problem of large-scale scrap caused by delayed quality feedback in traditional detection methods. Simultaneously, the acquisition of real-time data allows operators to adjust production process parameters promptly, reducing quality defects at the source, effectively improving the quality and yield of finished quartz glass tubes, reducing raw material and energy waste and production costs, and eliminating potential quality hazards in the production process.

[0032] Furthermore, such as Figure 1 and Figure 2 As shown, the supporting structure includes: The first support structure 3 and the second support structure 4 are arranged adjacent to each other, with the first support structure 3 positioned closer to the heating furnace 1 than the second support structure 4. The first support structure 3 is used to install the diameter measuring component. The second support structure 4 is provided with two support wheels 5 and two traction wheels 6, with the support wheels 5 positioned closer to the first support structure 3 than the traction wheels 6. The two support wheels 5 are connected one-to-one with the two thickness measuring ends of the thickness measuring component, and the two support wheels 5 are used to always adhere to and support the outer wall of the formed tube 2 during the drawing process.

[0033] The first support structure 3 is positioned closer to the heating furnace 1 than the second support structure 4, and serves as the mounting carrier for the diameter measuring component. The second support structure 4 is used to support at least the thickness measuring component, the support wheel 5, and the traction wheel 6.

[0034] Two support wheels 5 are positioned close to the first support structure 3, opposite the two traction wheels 6. The two support wheels 5 work together to maintain contact with and support the outer wall of the formed tube 2 during the drawing process, preventing the formed tube 2 from shifting and thus preventing subsequent thickness measurement operations from being impossible. Furthermore, the two support wheels 5 are connected one-to-one to the two thickness measuring ends of the thickness measuring assembly, allowing the two thickness measuring ends to move synchronously with the two support wheels 5 to ensure the accuracy of the measured wall thickness.

[0035] Two traction wheels 6 are attached to the outer wall of the forming tube 2. Through the friction with the outer wall of the forming tube 2, they provide a stable and uniform traction force to the forming tube 2, so that the forming tube 2 is continuously pulled out of the heating furnace 1 and passes through the diameter measuring component, the support wheel 5 and the thickness measuring component in sequence at a fixed speed, so as to ensure that the detection process is synchronized with the production process, that is, online detection.

[0036] Furthermore, such as Figure 3 As shown, a V-shaped groove 7 is provided on the trolley 5, and the groove wall of the V-shaped groove 7 abuts against the outer wall of the forming tube 2.

[0037] Here, the two V-shaped groove walls of the V-groove 7 form a symmetrical clamping surface. The forming tube 2 has a cylindrical structure, which allows the symmetrical clamping surface to adapt to forming tubes 2 with different outer diameter specifications, improving the versatility of the device. Furthermore, the forming tube 2 is radially positioned by this contact method, ensuring that the central axis of the forming tube 2 is consistent with the rotation axis of the support wheel 5, thus avoiding the shaking and displacement of the forming tube 2 and affecting the measurement accuracy.

[0038] Furthermore, the diameter measuring assembly includes two pairs of diameter measuring instruments 8, which are slidably connected to the support body, and the measuring end of the diameter measuring instrument is the diameter measuring end.

[0039] Here, the measuring end is the measuring end of the diameter gauge 8, such as... Figure 1 and Figure 2 As shown, the two pairs of diameter gauges 8 are set in two mutually perpendicular directions. The measuring axes of the two pairs of diameter gauges 8 are perpendicular to each other and the measurement operation is started synchronously to measure the outer diameter value at the same cross section of the formed tube 2. This ensures the accuracy of the ellipticity value calculated later. Furthermore, acquiring multiple sets of ellipticity data can also avoid quality misjudgment caused by measurement in a single direction.

[0040] The diameter gauge 8 and the support body are slidably connected, for example, by installing a slider on the diameter gauge 8 and opening an annular guide rail at the first support structure 3. The slider is slidably connected to the guide rail, so that the diameter gauge 8 can move along the guide rail and be in different positions, which is convenient for multi-directional ellipticity detection. After installation and adjustment, the transmitting end and receiving end of the diameter gauge 8 maintain a fixed relative position to ensure that the measurement reference is consistent, thereby accurately measuring the outer diameter of the formed tube 2.

[0041] Furthermore, the outer wall of the thickness measuring component is provided with a hot water insulated sleeve 14. In this embodiment, the thickness measuring component is a thickness gauge 9; the hot water insulated sleeve 14 can be made of pure copper plate, for example, by slotting a pure copper plate and embedding copper pipes, which are respectively arranged on the top, front, left and right sides, and mounting surface of the thickness gauge 9; such as Figure 6 and Figure 7 As shown, a quartz glass plate 15 is installed at the detection port of the thickness gauge 9 in the hot water jacket 14 to prevent the high-temperature formed tube 2 from directly radiating to the thickness gauge 9. Simultaneously, an air-cooling structure 16 is provided at the measurement port of the thickness gauge 9. The air-cooling structure 16 operates, for example, by introducing clean compressed air to dissipate heat and purge the lens of the thickness gauge 9. Here, the outlet temperature of the heating furnace 1 is typically above 500℃. The hot water jacket 14 effectively blocks its direct heat radiation, reducing heat transfer to the interior of the thickness gauge 9 and preventing damage to the precision components inside the thickness gauge 9 due to high temperatures, thereby ensuring the accuracy and stability of the wall thickness measurement.

[0042] Furthermore, the two trolley wheels 5 and the two traction wheels 6 are connected to the second support structure 4 through a synchronous opening and closing structure, which is used to drive the two trolley wheels 5 and the two traction wheels 6 to move synchronously.

[0043] When different specifications of forming tubes need to be drawn, the synchronous opening and closing structure drives two support wheels 5 to move synchronously away from the forming tube 2 along the track of the second support structure 4. At the same time, it drives two traction wheels 6 to move synchronously, so that the clamping surfaces of the V-groove 7 and the traction wheels 6 are always in close contact with the outer wall of the forming tube 2 to be drawn. There is no need to replace this device, which greatly shortens the specification changeover time and adapts to the needs of continuous and multi-variety production. Here, the synchronous opening and closing structure is, for example, a wide-type finger cylinder.

[0044] Furthermore, when the synchronous opening and closing structure drives the support wheel 5 to move, the thickness measuring end will move closer to or further away from the forming tube 2 in sync with the support wheel 5, ensuring that the thickness measuring end is always located on the radially parallel extension line of the forming tube 2, that is, the thickness measuring end is always facing the opposite side of the forming tube 2, without the need for manual adjustment of the thickness measuring position, which further improves the detection efficiency and accuracy.

[0045] Furthermore, such as Figure 4 As shown, the control unit includes: The data acquisition module 10 is used to receive the outer diameter value measured by the diameter measuring component and the wall thickness value measured by the thickness measuring component. The data processing module 11 is used to calculate the real-time ellipticity value of the formed tube 2 based on the outer diameter value measured by the diameter measuring component, and to calculate the real-time wall deviation value of the formed tube 2 based on the wall thickness value measured by the thickness measuring component.

[0046] Here, the data acquisition module 10 is, for example, an industrial-grade data acquisition card / embedded acquisition unit. The data processing module 11 is, for example, an embedded microprocessor unit / industrial PLC.

[0047] like Figure 5 As shown, this application provides a method for online detection of wall deviation and ellipticity in the drawing of quartz glass tubes, comprising the following steps: Step S10: The two support wheels 5 and two traction wheels 6 are moved by the synchronous opening and closing structure until the clamping centers of the two support wheels 5 and the two traction wheels 6 are aligned with the outlet end of the heating furnace 1. Then the detection device is started and the two traction wheels 6 are used to move the forming tube 2 at the target traction speed.

[0048] The synchronous opening and closing structure drives the two support wheels 5 and two traction wheels 6 to move, ultimately aligning the clamping centers of the two support wheels 5, the two traction wheels 6, and the center of the outlet tube of the heating furnace 1. This prevents distortion of subsequent test data due to initial positional deviations. After alignment, the testing device is activated, and the two traction wheels 6 move the quartz glass tube (i.e., the formed tube 2) formed from the heating furnace 1 at a preset target traction speed, providing dynamic samples for subsequent continuous testing. Here, the target traction speed can be set according to the traction requirements of different specifications of quartz glass tubes.

[0049] Step S20: Simultaneously measure the outer diameter of the formed tube 2 in two mutually perpendicular directions using the diameter measuring component, and simultaneously measure the wall thickness of the formed tube 2 on the opposite side using the thickness measuring component.

[0050] The diameter measuring component simultaneously measures the outer diameter of the formed tube 2 in two mutually perpendicular directions, such as one horizontal and the other vertical, thus providing a complete picture of the outer diameter profile of a certain cross-section of the formed tube 2. At the same time as the diameter measurement, the thickness measuring component simultaneously measures the wall thickness on the opposite side of the formed tube.

[0051] Step S30: Calculate the real-time ellipticity value of the formed tube 2 based on the outer diameter value, and calculate the real-time wall deviation value of the formed tube 2 based on the wall thickness value.

[0052] The real-time ellipticity value of the formed tube 2 is the difference between the outer diameter values ​​in two perpendicular directions measured in step S20. Ellipticity reflects the degree of deviation of the cross-sectional position of the formed tube 2 from an ideal circle. The real-time wall thickness deviation value of the formed tube 2 is the difference between the wall thickness values ​​on opposite sides measured in step S20. Wall thickness deviation reflects the uniformity of the wall thickness at the cross-sectional position of the formed tube 2.

[0053] This solution acquires data in real time, enabling operators to adjust production process parameters promptly, thereby reducing quality defects at the source, effectively improving the quality and yield of finished quartz glass tubes, reducing waste of raw materials and energy, lowering production costs, and eliminating potential quality hazards in the production process.

[0054] Furthermore, the method also includes the following steps: After the driving diameter measuring component rotates by a preset angle, steps S20 and S30 are repeated to obtain multiple sets of real-time ellipticity values ​​and real-time wall deviation values. If the real-time ellipticity value and real-time wall deviation value of the continuous preset group are both within the target fluctuation range, then the current pulling operation is determined to be in normal operation.

[0055] Here, the preset angle is, for example, 30°, 45°, or 60°, the preset group is, for example, three groups, and the target fluctuation range is, for example, the standard specification ±0.01mm. After rotating the preset angle, steps S20 and S30 are repeated. The purpose is to collect outer diameter and wall thickness values ​​in more directions to cover more locations of the cross-section of the formed tube 2. If the real-time ellipticity value and real-time wall deviation value of the consecutive preset groups are within the target fluctuation range, the current drawing operation is determined to be in normal operation. Otherwise, it is determined to be in abnormal operation, and an abnormal prompt message is issued to facilitate the operator to adjust the production process parameters in a timely manner and reduce quality defects from the source.

[0056] Furthermore, the method also includes the following steps: Based on the target traction speed of the formed tube 2, the wall thickness value measured by the thickness measuring component is timestamped to align it with the outer diameter value measured by the diameter measuring component of the same cross section in time. Based on the aligned outer diameter value and wall thickness value, the real-time wall deviation value and real-time ellipticity value of the cross section are calculated.

[0057] The diameter measuring component and the thickness measuring component record the timestamp of each measurement (i.e., the precise moment when the measurement occurs) and the corresponding measured value (outer diameter value or wall thickness value) during the measurement.

[0058] Given the target traction speed of the formed tube 2 and the fixed installation distance between the diameter measuring component and the thickness measuring component, the time required for the formed tube 2 to move from the diameter measuring component to the thickness measuring component can be calculated.

[0059] Based on the time required for the formed tube 2 to move from the diameter measuring component to the thickness measuring component, and the timestamp of the diameter measuring component's measurement, a time difference is calculated. This time difference is then used to compensate for the timestamp offset of the thickness measuring component's measurement data. For example, if the thickness measuring component measures a wall thickness value after the diameter measuring component, the corresponding actual cross-section needs to be traced back by the calculated time difference to ensure it belongs to the same cross-section as the outer diameter value measured by the diameter measuring component at that moment. Through this compensation, the outer diameter and wall thickness values ​​of the same cross-section are ultimately aligned in time.

[0060] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A device for online detection of wall deviation and ellipticity in the drawing of quartz glass tubes, characterized in that, include: The supporting body is arranged adjacent to the outlet pipe end of the heating furnace (1); The support body is provided with a diameter measuring component, which has two pairs of diameter measuring ends distributed along the circumference of the forming tube (2) for simultaneously measuring the outer diameter values ​​of the forming tube (2) in two mutually perpendicular directions; Thickness measuring component, the thickness measuring component is disposed on the support body and located on the side of the diameter measuring component away from the heating furnace (1); the thickness measuring component includes two thickness measuring ends located on an extension line parallel to the radial direction of the forming tube (2), for simultaneously measuring the wall thickness value on the opposite side of the forming tube (2); The control unit is located inside the support body and is communicatively connected to the diameter measuring component and the thickness measuring component. The control unit is used at least during the drawing process to control the two pairs of diameter measuring ends to simultaneously measure the outer diameter values ​​of the forming tube (2) in two mutually perpendicular directions, and to control the two thickness measuring ends to simultaneously measure the wall thickness values ​​on the opposite side of the forming tube (2), and to calculate the real-time ellipticity value and real-time wall deviation value of the forming tube (2) based on the outer diameter value and the wall thickness value. The supporting structure includes: A first support structure (3) and a second support structure (4) are arranged adjacent to each other. The first support structure (3) is positioned closer to the heating furnace (1) than the second support structure (4). The first support structure (3) is used to install the diameter measuring component. The second support structure (4) is provided with two support wheels (5) and two traction wheels (6). The support wheels (5) are positioned closer to the first support structure (3) than the traction wheels (6). The two support wheels (5) are connected one-to-one with the two thickness measuring ends of the thickness measuring component. The two support wheels (5) are used to always adhere to and support the outer wall of the forming tube (2) during the drawing process. The two trolleys (5) and the two traction wheels (6) are connected to the second support structure (4) through a synchronous opening and closing structure, which is used to drive the two trolleys (5) and the two traction wheels (6) to move synchronously. The trolley (5) has a V-shaped groove (7) and the groove wall of the V-shaped groove (7) abuts against the outer wall of the forming tube (2); the two groove walls of the V-shaped groove (7) form a symmetrical clamping surface.

2. The online wall deviation and ellipticity detection device for drawing quartz glass tubes according to claim 1, characterized in that, The diameter measuring assembly includes two pairs of diameter measuring instruments (8), which are slidably connected to the supporting body, and the measuring end of the diameter measuring instrument is the diameter measuring end.

3. The online wall deviation and ellipticity detection device for drawing quartz glass tubes according to claim 1, characterized in that, The outer wall of the thickness measuring component is provided with a hot water jacket (14).

4. The online wall deviation and ellipticity detection device for drawing quartz glass tubes according to claim 1, characterized in that, The control unit includes: The data acquisition module (10) is used to receive the outer diameter value measured by the diameter measuring component and the wall thickness value measured by the thickness measuring component. The data processing module (11) is used to calculate the real-time ellipticity value of the forming tube (2) based on the outer diameter value measured by the diameter measuring component, and to calculate the real-time wall thickness value of the forming tube (2) based on the wall thickness value measured by the thickness measuring component.

5. A method for online detection of wall deviation and ellipticity in the drawing of quartz glass tubes, implemented using the online wall deviation and ellipticity detection device for the drawing of quartz glass tubes according to any one of claims 1-4, characterized in that, The method includes the following steps: Step S10: Drive the two support wheels (5) and two traction wheels (6) to move through the synchronous opening and closing structure until the clamping centers of the two support wheels (5) and the clamping centers of the two traction wheels (6) are aligned with the outlet end of the heating furnace (1). Then start the detection device and use the two traction wheels (6) to drive the forming tube (2) to move at the target traction speed. Step S20: Simultaneously measure the outer diameter of the formed tube (2) in two mutually perpendicular directions using the diameter measuring component, and simultaneously measure the wall thickness of the formed tube (2) on the opposite side using the thickness measuring component. Step S30: Calculate the real-time ellipticity value of the formed tube (2) based on the outer diameter value, and calculate the real-time wall deviation value of the formed tube (2) based on the wall thickness value.

6. The method for detecting the wall deviation and ellipticity of a drawn quartz glass tube according to claim 5, characterized in that, It also includes the following steps: After driving the diameter measuring component to rotate by a preset angle, repeat steps S20 and S30 to obtain multiple sets of real-time ellipticity values ​​and real-time wall deviation values. If the real-time ellipticity value and real-time wall deviation value of the continuous preset group are both within the target fluctuation range, then the current pulling operation is determined to be in normal operation.

7. The method for detecting the wall deviation and ellipticity of a drawn quartz glass tube according to claim 5, characterized in that, It also includes the following steps: According to the target traction speed of the formed tube (2), the wall thickness value measured by the thickness measuring component is timestamped to make it aligned with the outer diameter value measured by the diameter measuring component of the same cross section in time, and based on the aligned outer diameter value and wall thickness value, the real-time wall deviation value and real-time ellipticity value of the cross section are calculated.

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