Manufacturing method of glass tube with special structure inside and eccentric broken filament tube

Abstract

The invention relates to a manufacturing method of a glass tube with a special structure inside, which comprises the following steps: S1, selecting supplied materials, S2, tapering an inner sleeve, S3, assembling the inner sleeve and the outer sleeve, S4, fixing an assembled structure, and S5, wiredrawing: wiredrawing an assembled tube by adopting a wiredrawing process to form the glass tube with the special structure inside, the manufacturing method breaks through the limitation of an existing glass tube punching technology, and the length, the inner diameter and the outer diameter can be freely customized; according to the technical scheme, the stability of the internal structure of the glass tube can be guaranteed, internal collapse and breakage are avoided, products with the same specification and multiple batches can be produced according to the selected master batch sleeve, and replicability is achieved. The invention further provides the eccentric broken filament pipe manufactured through the manufacturing method.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber and communication equipment structure, and in particular to a manufacturing method of a glass tube with a special structure inside and an eccentric capillary tube. Background Art

[0002] In the optical fiber and communication industry, it is often very difficult to obtain glass tubes with special internal structures (such as eccentric inner holes, special hole structures, or multiple inner hole structures). It requires very precise drilling positioning and matching long-distance drilling. If there are multiple holes, the stability of the adjacent structure must also be considered to prevent damage and collapse inside. This undoubtedly increases the cost and difficulty of obtaining.

[0003] However, glass tubes with complex structures are essential raw materials for various types of special optical fibers. The industry is in urgent need of an effective method to simply and efficiently obtain glass tubes with special internal structures. Summary of the invention

[0004] Based on the above description, the present invention provides a method for manufacturing a glass tube having a special internal structure to solve the technical problems in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: A method for manufacturing a glass tube having a special structure inside, comprising the following steps: S1. Select incoming materials, select an outer sleeve with a predetermined diameter and an inner sleeve with a predetermined structure, prepare solid wool, and pre-treat the outer sleeve, inner sleeve and solid wool; S2, inner sleeve taper drawing, using a drawing tower to draw one end of the inner sleeve into a taper; S3, assembling the inner and outer sleeves, installing a hose at one end of the inner sleeve taper, and installing an extension tube at the other end of the hose to form an inner sleeve assembly; placing the inner sleeve assembly into the outer sleeve, and filling the gap between the outer sleeve and the inner sleeve with solid wool of a predetermined specification until it is full, ensuring that the whole is filled without obvious gaps, to form an assembled tube; S4. The assembly structure is fixed, and one end of the assembly tube is softened. After softening, it is slightly squeezed to shrink the end, ensuring that all the solid hair threads inside are sticky and the solid hair threads will not fall out in the vertical state; a plug is installed at the other end of the assembly tube; S5, wire drawing; the assembled tube is drawn by a wire drawing process to form a glass tube with a special internal structure. During the wire drawing process, air is blown into the inner sleeve through the extension tube and the gap between the inner sleeve and the outer sleeve is compressed.

[0006] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. Break through the limitations of existing glass tube drilling technology and be able to freely customize the length and inner and outer diameters; 2. It can ensure the stability of the internal structure of the glass tube and prevent internal collapse and breakage.

[0007] 3. According to the selected masterbatch sleeve, multiple batches of products with the same specifications can be produced, and they are reproducible.

[0008] 4. The equipment requirements are not high, and the process can be carried out using only conventional wire drawing or stretching equipment.

[0009] 5. It takes little time and can prepare the target tube in a short time.

[0010] 6. The cost is extremely low. You can select conventional products on the market as glass masterbatch sleeves for production.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the material selection in step S1 also includes: S11. Incoming material inspection to ensure the ovality and eccentricity of incoming pipe fittings; S12, acid treatment, pickling the inner sleeve and the outer sleeve, and completely immersing the solid wool in the acid solution; S13, deacidification, washing with deionized water to remove acid; S14, alcohol washing and dehydration, the cleaned inner sleeve, outer sleeve and solid wool are subjected to alcohol washing and dehydration, and then purged with clean compressed air; S15, drying, placing the inner sleeve, outer sleeve and solid wool in a drying cabinet for drying.

[0013] Furthermore, the step S2 of using a drawing tower to draw one end of the inner sleeve into a tapered shape includes: S21, installing the inner sleeve to the drawing tower; S22, setting a predetermined wire drawing temperature, and slowly heating up to a target temperature; S23, the softened front end falls out of the drawing tower under the action of gravity, the fallen part is removed, and the heating is stopped; S24. After the inner sleeve is cooled, cut the material and the front end of the cone.

[0014] Furthermore, the hose in step S3 is a rubber tube with a predetermined wall thickness, and the connection parts between the two ends of the rubber tube and the inner sleeve and the extension tube are reinforced and sealed with thermoplastic tubes.

[0015] Furthermore, in step S4, the solid wool threads include at least two solid wool threads with different outer diameters, and the filling is performed by first filling the solid wool threads with larger outer diameters and then filling the solid wool threads with smaller outer diameters.

[0016] Furthermore, the inner sleeve is placed in the outer sleeve, and the end faces of the two sleeves are kept consistent.

[0017] Furthermore, the wire drawing process in step S5 includes: S51, complete the preparation work for going up the tower; S52, rod feeding mark, determining the effective interval length of the target assembly tube; S53, setting wire drawing process parameters, wherein the wire drawing process parameters at least include furnace temperature, wire diameter and rod feeding speed; S54, turning the cone head, after the softened cone head falls to the predetermined position, clamping the cone head, clamping the glass fiber, setting the pulling speed, confirming that the drawing base temperature is reached, closing the lower furnace mouth sealing piece, and starting automatic feeding; S55, wire drawing, gradually adjust the pulling speed to make the assembled tube reach the target rod feeding speed S56, brushed finish.

[0018] Furthermore, it also includes: S6. Finished products are sorted and data is recorded. According to the inner diameter and outer diameter information detected online during the wire drawing process, the finished wire drawing products are classified and placed in grades.

[0019] Furthermore, it also includes: S7, cutting and packaging, cutting the qualified finished products into glass tubes of predetermined length according to the corresponding inspection standards, and then packaging and arranging them for storage.

[0020] The present application also provides an eccentric bristle tube, which is prepared by the above-mentioned manufacturing method, and includes an outer sleeve, an inner sleeve and solid bristles. The inner sleeve is placed inside the outer sleeve, and the inner sleeve is eccentrically arranged relative to the outer sleeve. The gap between the outer sleeve and the inner sleeve is filled with the solid bristles until it is full. The combined structure composed of the outer sleeve, the inner sleeve and the solid bristles is drawn as a whole to form an eccentric bristle tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the steps of a method for manufacturing a glass tube having a special internal structure provided by an embodiment of the present invention; Figure 2 is a schematic diagram of the steps of step S1; Figure 3 is a schematic diagram of the steps of step S2; Figure 4 is a schematic diagram of the steps of step S5; Figure 5 A side cross-sectional view of the inner sleeve assembly in the embodiment of the present application; Figure 6This is the end cross-sectional view when the solid hair begins to fill; Figure 7 This is the end cross-sectional view after the solid hair filling is completed. DETAILED DESCRIPTION

[0022] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0024] It will be appreciated that spatial relationship terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as "on" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90° or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0025] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0026] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0027] like Figure 1As shown, the present application provides a method for manufacturing a glass tube having a special structure inside, which comprises the following steps: S1. Select incoming materials, select an outer sleeve with a predetermined diameter and an inner sleeve with a predetermined structure, prepare solid wool, and pre-treat the outer sleeve, inner sleeve and solid wool; S2, inner sleeve taper drawing, using a drawing tower to draw one end of the inner sleeve into a taper; S3, assembling the inner and outer sleeves, installing a hose at one end of the inner sleeve taper, and installing an extension tube at the other end of the hose to form an inner sleeve assembly; placing the inner sleeve assembly into the outer sleeve, and filling the gap between the outer sleeve and the inner sleeve with solid wool of a predetermined specification until it is full, ensuring that the whole is filled without obvious gaps, to form an assembled tube; S4. The assembly structure is fixed, and one end of the assembly tube is softened. After softening, it is slightly squeezed to shrink the end, ensuring that all the solid hair threads inside are sticky and the solid hair threads will not fall out in the vertical state; a plug is installed at the other end of the assembly tube; S5, wire drawing; the assembled tube is drawn by a wire drawing process to form a glass tube with a special internal structure. During the wire drawing process, air is blown into the inner sleeve through the extension tube.

[0028] Among them, Figure 2 As shown, the material selection in step S1 also includes: S11. Incoming material inspection to ensure the ovality and eccentricity of incoming pipe fittings; this ensures the normal progress of subsequent cold processing or acid treatment process.

[0029] S12, acid treatment, pickling the inner sleeve and the outer sleeve, and completely immersing the solid wool in the acid solution; S13, deacidification, washing with deionized water to remove acid; S14, alcohol washing and dehydration, the cleaned inner sleeve, outer sleeve and solid wool are subjected to alcohol washing and dehydration, and then purged with clean compressed air; S15, drying, placing the inner sleeve, outer sleeve and solid wool in a drying cabinet for drying.

[0030] like Figure 3 As shown, the step S2 of using a drawing tower to draw one end of the inner sleeve into a tapered shape includes: S21, installing the inner sleeve to the drawing tower; S22, setting a predetermined wire drawing temperature, and slowly heating up to a target temperature; S23, the softened front end falls out of the drawing tower under the action of gravity, the fallen part is removed, and the heating is stopped; S24. After the inner sleeve is cooled, cut the material and the front end of the cone.

[0031] Wherein, the hose in step S3 is a rubber tube with a predetermined wall thickness, and the connection parts between the two ends of the rubber tube and the inner sleeve and the extension tube are reinforced and sealed with thermoplastic tubes.

[0032] In step S4, the solid wool threads include at least two solid wool threads with different outer diameters, and the filling is performed by first filling the solid wool threads with larger outer diameters and then filling the solid wool threads with smaller outer diameters.

[0033] Wherein, when the inner sleeve is placed in the outer sleeve, the end faces of the two sleeves are kept consistent.

[0034] like Figure 4 As shown, the wire drawing process in step S5 includes: S51, complete the preparation work for going up the tower; S52, rod feeding mark, determining the effective interval length of the target assembly tube; S53, setting wire drawing process parameters, wherein the wire drawing process parameters at least include furnace temperature, wire diameter and rod feeding speed; S54, turning the cone head, after the softened cone head falls to the predetermined position, clamping the cone head, clamping the glass fiber, setting the pulling speed, confirming that the drawing base temperature is reached, closing the lower furnace mouth sealing piece, and starting automatic feeding; S55, wire drawing, gradually adjust the pulling speed to make the assembled tube reach the target rod feeding speed S56, brushed finish.

[0035] Based on the above steps, the manufacturing method further comprises: S6. Finished products are sorted and data is recorded. According to the inner diameter and outer diameter information detected online during the wire drawing process, the finished wire drawing products are classified and placed in grades.

[0036] S7, cutting and packaging, cutting the qualified finished products into glass tubes of predetermined length according to the corresponding inspection standards, and then packaging and arranging them for storage.

[0037] During use, the manufacturing method can be made into a single-hole tube or a multi-hole tube according to the number of selected inner sleeves, can be made into tubes with different inner hole shapes according to the hole structure of the selected inner sleeve, and can be made into an eccentric tube according to the position of the inner sleeve in the outer sleeve. The present application takes an eccentric hairline tube as an example to explain the manufacturing method in detail, wherein, Figure 6 The eccentric bristle tube shown includes an outer sleeve 10, an inner sleeve 20 and a solid bristle 30. The inner sleeve 20 is placed inside the outer sleeve 10. The inner sleeve 20 is eccentrically arranged relative to the outer sleeve 10. The gap between the outer sleeve 10 and the inner sleeve 20 is filled with the solid bristle 30 until it is full. The combined structure formed by the outer sleeve 10, the inner sleeve 20 and the solid bristle 30 is drawn as a whole to form an eccentric bristle tube.

[0038] In this embodiment, the eccentric hairline tube is specifically manufactured from an eccentric borosilicate tube with a target size of 2*0.4*4.

[0039] The first step S1 is material selection, selecting an outer sleeve with a predetermined diameter and an inner sleeve with a predetermined structure, preparing solid wool, and pre-treating the outer sleeve, the inner sleeve and the solid wool; In this application, the outer sleeve and the inner sleeve are selected as borosilicate tubes of 50*40*1500 and 20*10*1200 respectively, and the solid hair wire is solid borosilicate hair wire with a length of 1000mm. There are three specifications in total, including 200 pieces with an outer diameter of 1.00mm, 50 pieces with an outer diameter of 0.80mm, and 50 pieces with an outer diameter of 0.75mm.

[0040] First, S11 and incoming material inspection are carried out to ensure that the ovality and eccentricity of the mother tube (i.e. the initial outer sleeve and inner sleeve of the incoming material) are good, so as to ensure the normal progress of the subsequent cold processing or acid treatment process.

[0041] Among them, according to actual production needs, the inspection standards for outer casing and inner casing are Material outer diameter inner diameter length Ellipticity Eccentricity Tube Type High borosilicate 50.00±0.50mm 40.00±0.50mm 1500.00±1mm <0.30mm <100um Outer sleeve High borosilicate 20.00±0.50mm 10.00±0.50mm 1200.00±1mm <0.30mm <100um Inner casing The inspection method is shown in the figure. Take any mother pipe fitting as an example, determine the A end and B end of the mother pipe, where M is the middle point of the base pipe, and use a digital caliper to measure the relevant data of the three points A, M, and B. During the specific measurement, rotate and measure 5 sets of data of the inner and outer diameters of the A end and the B end, record the maximum and minimum values, and calculate the ovality of the two ends. Among them, the measurement points of the A and B ends are required to be within the range of 15.00~25.00mm from the two end surfaces; the M point is rotated to measure 5 sets of data of the outer diameter.

[0042] Then measure the eccentric wall thickness, that is, the thickness from the inner ring edge to the outer ring edge. Measure the wall thickness on both opposite sides of the radial direction of the mother tube, record 5 sets of data, take the maximum value a and the minimum value b, where the eccentricity is (ab) / 2.

[0043] Then S12, acid treatment, is performed. In actual operation, the pickling operator needs to confirm the incoming materials, check whether the incoming materials are consistent with the parameter information and whether they meet the process requirements, and determine whether pickling or acid etching process is required based on the incoming material information.

[0044] In order to ensure the smooth progress of subsequent processes, the pickling operator is also required to review the inner and outer diameters of both ends of the mother tube, measure the outer diameter of the mother tube at intervals, use a tape measure to measure the length of the mother tube, and check whether there are obvious defects on the inner and outer surfaces of the mother tube. If there are defects, determine whether the defects will be eliminated or become more serious due to corrosion, and record them after the evaluation is completed; then confirm the number of solid hair fibers, and place them separately according to specifications. Note that hair fibers of different specifications cannot be cleaned at the same time.

[0045] When pickling, simply pickle the inner and outer sleeves, and the immersion time of the effective area cannot exceed 5 minutes; the solid wool wire must be completely immersed in the acid solution, and the number of wires cleaned each time must be guaranteed to be within 30 to ensure that there are no inclusions between the wool wires.

[0046] After the pickling is completed, S13, deacidification, is performed; specifically, deionized water is used for rinsing and deacidification, and the rinsing time needs to be greater than 5 minutes to ensure that the acid is completely removed.

[0047] Then proceed to S14, alcohol washing and dehydration, and alcohol washing and dehydration of the cleaned inner sleeve, outer sleeve and solid wool. The alcohol washing time is greater than 5 minutes, and then purged with clean compressed air to remove residual ethanol. It can be observed with the naked eye that there is no strand of flow.

[0048] Finally, S15 is performed, and the inner sleeve, outer sleeve and solid wool are placed in a drying cabinet for drying. The drying time is more than 30 minutes. After the dried masterbatch is taken out, the appearance is confirmed, and no obvious water stains and floating dust residue are required.

[0049] The above-mentioned pre-processing preparation work before preparation is completed, and the second step S2 is entered, the inner sleeve is tapered, and one end of the inner sleeve is drawn into a taper using a drawing tower.

[0050] Specifically, first, S21, the inner sleeve is installed on a drawing tower to perform a taper removal process; S22, setting a predetermined drawing temperature. In this embodiment, the drawing temperature is 980° C. and slowly raising the temperature to the target temperature; S23, the softened front end falls out of the drawing tower under the action of gravity, the fallen part is removed, and the heating is stopped; S24. After the inner sleeve is cooled, cut the material and the front end of the cone.

[0051] Lateral cross-section of the inner casing after implementation Figure 5 As shown.

[0052] Then proceed to S3, assemble the inner and outer sleeves, install the hose 40 at one end of the inner sleeve 20, and install the extension tube 50 at the other end of the hose 40 to form an inner sleeve assembly; put the inner sleeve assembly into the outer sleeve 10, and fill the gap between the outer sleeve 10 and the inner sleeve 20 with solid wool 30 of predetermined specifications until it is full, ensuring that the whole is filled without obvious gaps, to form an assembled tube.

[0053] Specifically, the hose 40 is a thick-walled rubber tube. The rubber tube needs to be at least 100 mm long and needs to be soft enough to adjust its position. The other end of the rubber tube is installed with a 10mm*5mm*500mm long borosilicate tube. During the installation process, ensure that the middle part of the rubber tube is adjustable. The middle rubber tube and the connecting parts at both ends are reinforced and sealed with thermoplastic tubes to prevent air leakage.

[0054] During the specific assembly process, the outer sleeve 10 and the inner sleeve assembly are taken out and placed horizontally, and the inner sleeve assembly is placed horizontally into the outer sleeve 10 to ensure that the horizontal end surfaces are consistent.

[0055] The filling is carried out by first filling the solid wool with a larger outer diameter and then filling the solid wool with a smaller outer diameter. Specifically, the 1.0 mm wool is gradually filled into the gap between the outer sleeve 10 and the inner sleeve 20 until it is full, and then the 0.8 mm and 0.75 mm wool are filled into the remaining gap to ensure that the overall filling has no obvious gaps.

[0056] End section view after filling starts and after filling is completed Figure 6 As shown in the figure and Figure 7 shown.

[0057] Then enter S4, fix the assembly structure, soften one end of the assembly tube, and squeeze it slightly to shrink it after softening, so as to ensure that all the solid hair ends inside are sticky and the solid hair will not fall out in the vertical state; install a plug at the other end of the assembly tube.

[0058] Specifically, place the assembled assembly tube horizontally on a welding lathe, turn on the welding lathe to soften its end face, squeeze it slightly to shrink it after softening, ensure that all the solid hair ends inside are sticky, remove the assembly sleeve, tilt it slightly, the internal solid hair does not move, assemble the sleeve completely vertically, the internal solid hair does not fall out, install a plug at the other end of the assembly tube, ensure that the gap between the inner sleeve and the inner and outer sleeves has an external air pipe for pumping pressure.

[0059] Finally, blade S5 is entered for wire drawing. The assembled tube is wire drawn by a wire drawing process to form a glass tube with a special internal structure. During the wire drawing process, air is blown into the inner sleeve through the extension tube and the gap between the inner sleeve and the outer sleeve is compressed.

[0060] An extension tube 50 is added to the inner sleeve 20 for gas transmission, and an airtight plug is added to the outer sleeve 10 to ensure that the internal gap can be evacuated under negative pressure when the internal ventilation is performed to ensure that the middle part is completely melted and shrunk.

[0061] The wire drawing process in step S5 includes: S51, complete the preparation work for going up the tower; First, on the drawing tower, according to the type of capillary product being drawn, open the corresponding process parameter estimation template and select the drawing base temperature; refer to the feed speed of the same or similar specifications in the process estimation table to estimate the pulling speed and the drawing time. After the base temperature and the turning temperature are selected, in principle, no changes are allowed during the subsequent drawing process. If any abnormality occurs, it needs to be reported to the drawing team leader before processing.

[0062] In this embodiment, according to the drawing tower requirements, the preparation work also includes: (1) Preheating of the heating furnace: After verifying that the size of the mother tube (combined tube to be drawn) is correct, the heating furnace is heated to 200°C for preheating; (2) Confirmation of the drawing tower status: clean the tail vertebrae left by the drawing and confirm that the drawing tower equipment functions normally; (3) Upper furnace mouth sealing: Based on the outer diameter of the mother tube, select a suitable sealing glass cover and align it to the upper furnace mouth; (4) Rod support: Insert the rod from above the chuck jaws, move the chuck up to a suitable height, and clamp the chuck at a position where the opening is expanded by 30mm-50mm; (5) Centering of the upper furnace mouth: Move the lower end of the mother tube to be flush with the upper edge of the sealing cover to confirm the centering. If there is a significant misalignment, the centering can be performed by rotating the mother tube or adjusting the position of the sealing cover within the gap of the positioning cover. (6) Furnace centering: Move the mother tube down 100mm - 120mm into the furnace, and use a reflector to check the symmetry of the gap between the base tube and the furnace from below the heating furnace; (7) Furnace preheating: set the temperature to 600°C and preheat the heating furnace; S52, rod feeding mark, determining the effective interval length of the target assembly tube; Specifically, the tube without a taper at the end needs to be fed down 100mm - 120mm, and the tube with a taper at the end can be fed an additional 10mm. The effective drawing length of the mother tube needs to be recorded each time.

[0063] S53, setting wire drawing process parameters, wherein the wire drawing process parameters at least include furnace temperature, wire diameter and rod feeding speed; Specifically include: (1) After confirming that the mother tube has stayed at the set value of 600℃ for more than 5 minutes, set the furnace temperature to 800℃, wait for the furnace temperature to reach 2000℃ for 3-5 minutes, and then set the turning temperature to the turning temperature required by the process; (2) Set the measurement range of the outer diameter of the hair wire, set the rod feeding speed according to the rod feeding speed of similar products, and start automatic feeding when the temperature drops to the wire drawing base temperature after the cone falls off; (3) After the lower end is sealed, start to evacuate with an external vacuum pump, strictly control the evacuation pressure, and make real-time adjustments; S54, turning the cone head, after the softened cone head falls to the predetermined position, clamping the cone head, clamping the glass fiber, setting the pulling speed, confirming that the drawing base temperature is reached, closing the lower furnace mouth sealing piece, and starting automatic feeding; When turning around, ensure that the sealing piece of the lower furnace mouth is open and the diameter gauge is coaxial with the center line of the wire drawing process, and open the gap of the traction wheel to ensure that its value is not less than the outer diameter of the mother tube; while waiting for the cone to fall, promptly use a reflector to regularly observe and track the deformation state of the glass in the furnace to prevent the softening zone caused by high temperature from contacting the inner wall of the furnace; wait for the cone head to fall to 100mm - 200mm below the traction wheel, and after the cone head is clamped off, adjust the traction wheel to just clamp the glass filament, and use the pulley to limit the glass filament to the center line of the wire drawing process; set the traction wheel speed to 0.03-0.04 m / min for slow traction, and wait for the furnace temperature to drop to the base temperature of wire drawing; open the valve of compressed air for cooling to cool the glass filament to prevent scalding the traction wheel.

[0064] S55, wire drawing, gradually adjusting the pulling speed so that the assembled tube reaches the target rod feeding speed; Specifically, (1) starting from automatic feeding, wire drawing is performed at 1 / 2 of the pulling speed. When the wire diameter reaches 2 / 3 of the target, the pulling speed is adjusted to the reference value. When the wire diameter is stable within 0.03 mm for 3 min, the pulling speed is precisely optimized to reach the target value. Among them, when the hairy wire tube turns to the stable stage, it is necessary to pay attention to whether there are air lines, and observe whether there are air holes on the end face under a microscope. Only after the appearance and size are qualified can it be counted as a finished product; before stable traction, the main thing is to observe the change trend, and at the same time, the display value lag caused by the beta position should be taken into account. It is not recommended to frequently adjust the traction speed according to the display value; in the wire drawing process, controlling the inner diameter to meet the requirements is the first task, and the actual target value of the outer diameter is converted through the measured actual OD / ID (outer diameter / inner diameter) ratio. Controlling the outer diameter target value to achieve precise control of the inner diameter geometry index is the core task of online process control; in addition, at the beginning of the wire drawing, when the outer diameter is close to the target value, it is necessary to confirm whether the outer diameter and inner diameter ellipticity, structural defects, surface finish and other indicators are scrapped; Among them, connect the glass tube extending from the upper end plug to compressed air, slowly open the flow meter, and adjust the size of the flow meter to align with the inner aperture size.

[0065] S56, brushed finish.

[0066] It should be noted that in the final stage of wire drawing, because the heat dissipation mode of the tube / rod is changed after the weld enters the upper sealing glass cover, it has a certain impact on the temperature field of the cone area in the furnace, which is generally reflected in the wire diameter diagram as a significant change in wire diameter (generally first smaller and then larger); at this time, it is recommended to first go up the tower to confirm that the weld has entered the upper sealing glass cover, and check the centering state of the sealing cover and the extension tube, and adjust the centering if necessary; the principle is to not adjust the traction speed, wait for the wire diameter to stabilize, and then decide whether to complete the wire drawing of the tail cone by adjusting the traction according to the actual situation of the inner and outer diameters; to ensure the structural stability of the wire drawing tower, after stopping feeding, if the wire drawing is not continuous within 4 hours, set the furnace temperature to 200℃ and turn off the power of the heating furnace, otherwise the furnace temperature will drop to 600℃; among them, after cooling down, move the chuck up to keep the tail cone to the area where the sealing cover does not come out of the upper furnace mouth for insulation; after removing the tail cone, cover the upper furnace mouth with asbestos, clean the wire drawing area, and complete the wire drawing.

[0067] Then enter the sixth step S6, finish product sorting and data recording, and classify and grade the finished wire drawing products according to the inner diameter and outer diameter information detected online during the wire drawing process.

[0068] Specifically, glass fibers whose geometric indicators do not meet the technical specifications will not be counted as finished products, but whose inner and outer diameters are uniform and whose structural defects are in good condition will be marked with the indicator fluctuation range parameters and labeled as "capillaries to be processed" or "glass tubes to be processed", bundled separately and stored in designated shelf areas for customer customization. Products with large wire diameter fluctuations, large ovality, poor smoothness or white air lines in the internal structure will be directly scrapped after being reported to the technical person in charge of the wire drawing process for confirmation.

[0069] S7, cutting and packaging, cutting the qualified finished products into glass tubes of predetermined length according to the corresponding inspection standards, and then packaging and arranging them for storage.

[0070] During slitting, the target hair tube rotates twice on the edge of the grinding wheel blade and then is slowly cut off. During the slitting process, it is necessary to periodically check the length of the hair after slitting. Specifically, use a tape measure to measure the length of the hair tube after slitting to determine whether it meets the requirements.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for manufacturing a glass tube having a special internal structure, characterized in that: The steps include: S1. Select incoming materials, select an outer sleeve with a predetermined diameter and an inner sleeve with a predetermined structure, prepare solid wool, and pre-treat the outer sleeve, inner sleeve and solid wool; S2, inner sleeve taper drawing, using a drawing tower to draw one end of the inner sleeve into a taper; S3, assembling the inner and outer sleeves, installing a hose at one end of the inner sleeve taper, and installing an extension tube at the other end of the hose to form an inner sleeve assembly; placing the inner sleeve assembly into the outer sleeve, and filling the gap between the outer sleeve and the inner sleeve with solid wool of a predetermined specification until it is full, ensuring that the whole is filled without obvious gaps, to form an assembled tube; S4. The assembly structure is fixed, and one end of the assembly tube is softened. After softening, it is slightly squeezed to shrink the end, ensuring that all the solid hair threads inside are sticky and the solid hair threads will not fall out in the vertical state; a plug is installed at the other end of the assembly tube; S5, wire drawing, using a wire drawing process to draw the assembled tube to form a glass tube with a special internal structure. During the wire drawing process, air is blown into the inner sleeve through the extension tube and the gap between the inner sleeve and the outer sleeve is compressed.

2. The method for manufacturing a glass tube having a special internal structure according to claim 1, characterized in that: In step S1, the material selection also includes: S11. Incoming material inspection to ensure the ovality and eccentricity of incoming pipe fittings; S12, acid treatment, pickling the inner sleeve and the outer sleeve, and completely immersing the solid wool in the acid solution; S13, deacidification, washing with deionized water to remove acid; S14, alcohol washing and dehydration, the cleaned inner sleeve, outer sleeve and solid wool are subjected to alcohol washing and dehydration, and then purged with clean compressed air; S15, drying, placing the inner sleeve, outer sleeve and solid wool in a drying cabinet for drying.

3. The method for manufacturing a glass tube having a special internal structure according to claim 1, characterized in that: The step S2 of using a drawing tower to draw one end of the inner sleeve into a tapered shape includes: S21, installing the inner sleeve to the drawing tower; S22, setting a predetermined wire drawing temperature, and slowly heating up to a target temperature; S23, the softened front end falls out of the drawing tower under the action of gravity, the fallen part is removed, and the heating is stopped; S24. After the inner sleeve is cooled, cut the material and the front end of the cone.

4. The method for manufacturing a glass tube having a special internal structure according to claim 1, characterized in that: The hose in step S3 is a rubber tube with a predetermined wall thickness, and the connection parts between the two ends of the rubber tube and the inner sleeve and the extension tube are reinforced and sealed with thermoplastic tubes.

5. The method for manufacturing a glass tube having a special internal structure according to claim 1, characterized in that: In step S4, the solid wool threads include at least two solid wool threads with different outer diameters, and the filling is performed by first filling the solid wool threads with larger outer diameters and then filling the solid wool threads with smaller outer diameters.

6. The method for manufacturing a glass tube having a special internal structure according to claim 5, characterized in that: The inner sleeve is placed in the outer sleeve, and the end faces of the two sleeves are consistent.

7. The method for manufacturing a glass tube having a special internal structure according to claim 1, characterized in that: The wire drawing process in step S5 includes: S51, complete the preparation work for going up the tower; S52, rod feeding mark, determining the effective interval length of the target assembly tube; S53, setting wire drawing process parameters, wherein the wire drawing process parameters at least include furnace temperature, wire diameter and rod feeding speed; S54, turning the cone head, after the softened cone head falls to the predetermined position, clamping the cone head, clamping the glass fiber, setting the pulling speed, confirming that the drawing base temperature is reached, closing the lower furnace mouth sealing piece, and starting automatic feeding; S55, wire drawing, gradually adjusting the pulling speed so that the assembled tube reaches the target rod feeding speed; S56, brushed finish.

8. The method for manufacturing a glass tube having a special internal structure according to claim 1, characterized in that: Also includes: S6. Finished products are sorted and data is recorded. According to the inner diameter and outer diameter information detected online during the wire drawing process, the finished wire drawing products are classified and placed in grades.

9. The method for manufacturing a glass tube having a special internal structure according to claim 1, characterized in that: Also includes: S7, cutting and packaging, cutting the qualified finished products into glass tubes of predetermined length according to the corresponding inspection standards, and then packaging and arranging them for storage.

10. An eccentric capillary tube, characterized in that: It is prepared by the manufacturing method described in claim 1, and includes an outer sleeve, an inner sleeve and solid hair. The inner sleeve is placed inside the outer sleeve, and the inner sleeve is eccentrically arranged relative to the outer sleeve. The gap between the outer sleeve and the inner sleeve is filled with the solid hair until it is full. The combined structure composed of the outer sleeve, the inner sleeve and the solid hair is drawn as a whole to form an eccentric hair tube.

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