Hollow non-circular glass tube preparation system and preparation method

Abstract

The invention provides a hollow non-circular glass tube preparation system which comprises a lathe bed, a connecting base used for connecting the two ends of a quartz tube is further arranged on the lathe bed, a carrying table capable of moving in the length direction of the quartz tube is further arranged on the lathe bed, a heating blast burner is arranged on the carrying table and aligns to the quartz tube, and a graphite rod is arranged in the quartz tube. A gap cavity is formed between the outer wall of the graphite rod and the inner wall of the quartz tube, the two ends of the graphite rod are connected with the connecting seat, sealing plugs are arranged at the two ends of the graphite rod and the two ends of the quartz tube, and a negative-pressure air pipe is further arranged and communicated with the gap cavity between the graphite rod and the quartz tube; the problem of high-precision forming of the non-circular glass tube is solved.

Description

Technical Field

[0001] The invention relates to the field of optical fiber manufacturing, and in particular to a hollow non-circular glass tube preparation system and preparation method. Background Art

[0002] Glass tubes or quartz glass tubes are a common industrial and laboratory material. They have many uses, such as chemical pipes, test tubes, and some special optical fibers.

[0003] At present, most conventional glass tubes are circular. In special applications, square glass tubes, hexagonal glass tubes and various non-standard glass tubes are also needed. These glass tubes can be prepared by different methods, such as glass melt drawing, blowing and machining. Patent CN 209636103 U discloses a device and method for converting a circular glass tube into a square glass tube, which is mainly achieved by converting a circular glass tube into a glass tube with a square inner hole by a mold and vertical stretching. Patent CN 203429051U discloses a lifting furnace for producing square-hole quartz tubes. The lifting furnace is mainly composed of a furnace body, a tungsten crucible, a forming material table, a square forming port and a square tungsten core rod. A glass tube with a square inner hole is prepared by feeding materials into the furnace body, heating and melting, and using a square tungsten core rod.

[0004] The above methods either rely on manual production, and the uniformity and consistency of the glass shell wall thickness are difficult to meet the dimensional accuracy requirements, or have high requirements on equipment, consume a long processing time, high cost, and lack of economy. Summary of the invention

[0005] The invention provides a hollow non-circular glass tube preparation system and preparation method, which solves the problem of high-precision forming of non-circular glass tubes.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a hollow non-circular glass tube preparation system, including a bed, a connecting seat for connecting the two ends of a quartz tube is provided on the bed, a carrier that can move along the length direction of the quartz tube is provided on the bed, a heating blowtorch is provided on the carrier, the heating blowtorch is aimed at the quartz tube, a graphite rod is provided in the quartz tube, a gap cavity is provided between the outer wall of the graphite rod and the inner wall of the quartz tube, both ends of the graphite rod are connected to the connecting seat, sealing plugs are provided at both ends of the graphite rod and the quartz tube, and a negative pressure air pipe is provided, and the negative pressure air pipe is connected to the gap cavity between the graphite rod and the quartz tube.

[0007] In a preferred solution, the connecting seat includes a fixed seat and a movable seat, and both the fixed seat and the movable seat are provided with a rotatable chuck fixture, and the chuck fixture is used to position the two ends of the quartz tube.

[0008] In a preferred embodiment, the graphite rod includes a non-circular segment, and end shafts are provided at both ends of the non-circular segment, and the end shafts are sleeved with the sealing plugs. Extended welding tubes are provided at both ends of the quartz tube, and the length of the non-circular segment is greater than the length of the quartz tube.

[0009] In a preferred solution, the graphite rod is a hollow structure, the non-circular segment is broken in the middle to form two half segments, and a central axis is sleeved inside the graphite rod.

[0010] In a preferred solution, a recessed groove structure is provided at the central break of the non-circular segment, the half segment includes a central segment and a side segment, the side segment is connected to the end shaft portion, and a protrusion is provided at the recessed groove structure of the non-circular segment in the center of the central axis.

[0011] In a preferred embodiment, the sealing plug includes a basic sleeve, which is provided with an outer ring sealing ring and an inner ring sealing ring, wherein the outer side of the outer ring sealing ring abuts against the inner wall of the raised portion, and the inner side of the inner ring sealing ring abuts against the outer wall of the end shaft portion.

[0012] In the preferred scheme, a slope surface is provided on the outer side of the basic sleeve, one side of the outer ring sealing ring rests on the slope surface, a reverse slope surface is provided on the inner side of the basic sleeve, one side of the inner ring sealing ring rests on the reverse slope surface, the basic sleeve is provided with an outer sleeve and an inner sleeve, a first push rod and a second push rod are respectively provided with threaded connections on the bottom walls of the outer sleeve and the inner sleeve, an outer push ring is provided between the outer ring sealing ring and the first push rod, the first push rod pushes the outer push ring to squeeze the outer ring sealing ring, an inner push ring is provided between the inner ring sealing ring and the second push rod, the second push rod pushes the inner push ring to squeeze the inner ring sealing ring, a plurality of first threaded adjustment rods are provided along the circumferential direction on the side wall of the outer sleeve, one end of the first adjustment rod rests on the outer wall of the extended welding pipe, a plurality of second adjustment rods are provided along the circumferential direction on the side wall of the inner sleeve, one end of the second adjustment rod rests on the outer wall of the end shaft portion.

[0013] In a preferred solution, a clamping portion is provided at one end of the outer sleeve away from the quartz tube.

[0014] In a preferred solution, one end of the basic sleeve inserted into the lengthened welded pipe is provided with a detachable hollow end sleeve, and the slope surface is provided on the hollow end sleeve.

[0015] The preparation method includes: selecting a sealing plug, a graphite rod, a quartz tube and an extended welding tube of suitable specifications; Connect the extended welding tubes to both ends of the quartz tube; Insert the graphite rod into the quartz tube and install the sealing plug to form an integrated sleeve; Place the integrated sleeve on the bed, and clamp the two ends of the integrated sleeve with a chuck fixture; The chuck fixtures on the fixed seat and the movable seat rotate synchronously; Start the heating torch to preheat the quartz tube; Turn on the negative pressure to evacuate the cavity between the quartz tube and the graphite rod, and at the same time move the heating torch from the end of the quartz tube away from the exhaust to the end close to the exhaust; The quartz tube shrinks until it is close to the outer wall of the graphite rod; Wait for the quartz tube to cool, remove and cut off the extended welded tube.

[0016] The beneficial effects of the present invention are as follows: a negative pressure device is used in conjunction with a fire bed to prepare glass tubes of various shapes, the equipment is simple, the investment is small, the consistency between batches is good, and it is suitable for mass production; a graphite inner core is used as an inner mold for forming the glass tube, the graphite is resistant to high temperatures, and the surface friction coefficient is small, it is easy to pull out, and it can be reused; the ends of the glass tube and the graphite core adopt a sealing plug with a coaxial positioning structure, the sealing plug at one end has an airway, and can be directly connected to the negative pressure pipeline, the glass tube and the graphite core can be assembled in advance and ensure coaxiality, and finally installed on the fire bed fixture, the operation is simple, the coaxiality is high, and the accuracy of the formed glass tube is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 is a schematic diagram of the preparation apparatus.

[0019] Figure 2 It is a simplified schematic diagram of the installed integrated casing.

[0020] Figure 3 This is a diagram of the segmented structure of a graphite core rod.

[0021] Figure 4 This is a multi-section structure diagram of a graphite core rod.

[0022] Figure 5 This is a cross-sectional view of the sealing plug.

[0023] Figure 6 It is a cross-sectional view of the sealing plug.

[0024] Figure 7 It is a schematic diagram of the double sealing structure of the sealing plug.

[0025] Figure 8 This is a diagram of the coaxial installation system of the quartz tube and the sealing plug.

[0026] In the figure: bed 1; fixed seat 2; movable seat 3; carrier 4; support frame 401; heating torch 5; chuck fixture 6; sealing plug 7; airway 701; basic sleeve 702; outer ring sealing ring 703; inner ring sealing ring 704; slope surface 705; reverse slope surface 706; outer push ring 707; inner push ring 708; outer sleeve 709; inner sleeve 710; first push rod 711; second push rod 712; first adjustment rod 713; second adjustment rod 714; clamping part 71 5; dovetail groove 716; negative pressure air pipe 8; graphite rod 9; central segment 901; side segment 902; end shaft 903; non-circular segment 904; half segment 905; sink structure 906; quartz tube 10; extended welding tube 1001; central axis 11; raised portion 1101; vacuum pump 12; hollow end sleeve 13; collar 14; marble ruler 15; marble platform 16; rack 17; first servo motor 18; lead screw 19; second servo motor 20; guide rail 21. DETAILED DESCRIPTION

[0027] Embodiment 1: like Figure 1-8 A hollow non-circular glass tube preparation system includes a bed 1, a connecting seat for connecting two ends of a quartz tube 10 is provided on the bed 1, a carrier 4 movable along the length direction of the quartz tube 10 is provided on the bed 1, a heating torch 5 is provided on the carrier 4, the heating torch 5 is aimed at the quartz tube 10, a graphite rod 9 is provided in the quartz tube 10, a gap cavity is provided between the outer wall of the graphite rod 9 and the inner wall of the quartz tube 10, two ends of the graphite rod 9 are connected to the connecting seat, two ends of the graphite rod 9 and the quartz tube 10 are provided with sealing plugs 7, and a negative pressure air pipe 8 is also provided, and the negative pressure air pipe 8 is connected to the gap cavity between the graphite rod 9 and the quartz tube 10.

[0028] A support frame 401 is provided on the carrier 4 to elevate the heating torch 5 .

[0029] One end of the negative pressure air pipe 8 is connected to a vacuum pump 12 , an air channel 701 is provided on the sealing plug 7 , an air joint is provided at the outer end of the air channel 701 , the negative pressure air pipe 8 is connected to the air joint, and the inner end of the air channel 701 is connected to the gap cavity between the graphite rod 9 and the quartz tube 10 .

[0030] A guide rail is laid on the bed 1, a slider is provided at the lower end of the platform 4, and is clamped on the guide rail 21 to slide. A lead screw 19 can be arranged on the bed 1, a nut seat is set on the platform 4 and is sleeved on the lead screw 19, and a second servo motor 20 is provided at one end of the lead screw 19 to drive it.

[0031] The heating torch 5 heats the outer wall of the quartz tube 10, and the carrier 4 moves from the end away from the negative pressure air pipe 8 to the end close to the negative pressure air pipe 8. Graphite has high temperature resistance, and the graphite rod 9 will not produce a large deformation. After the quartz tube 10 is hot-melted, it gradually shrinks and sticks to the surface of the graphite rod 9 under the action of the negative pressure gas, and becomes the shape of the graphite rod 9 after cooling.

[0032] In a preferred solution, the connecting seat includes a fixed seat 2 and a movable seat 3 , and a rotatable chuck fixture 6 is provided on both the fixed seat 2 and the movable seat 3 , and the chuck fixture 6 is used to position the two ends of the quartz tube 10 .

[0033] A torque turntable is provided on the fixed seat 2 and the movable seat 3, and a chuck fixture 6 is installed on the flange of the torque turntable.

[0034] The chuck fixture 6 is a three-jaw chuck with a hollow center.

[0035] A slider is installed at the lower end of the moving seat 3 and is clamped on the guide rail 21 of the bed 1 .

[0036] A first servo motor 18 is provided on one side of the moving seat 3 , a gear is installed on the motor shaft, and a rack 17 is installed on the side of the bed 1 , the gear is meshed with the rack 17 , and the servo motor drives the moving seat 3 to move horizontally.

[0037] In the preferred embodiment, the graphite rod 9 includes a non-circular segment 904, and end shafts 903 are provided at both ends of the non-circular segment 904. The end shafts 903 are sleeved with the sealing plug 7. Extended welding tubes 1001 are provided at both ends of the quartz tube 10. The length of the non-circular segment 904 is greater than the length of the quartz tube 10.

[0038] The end shaft portion 903 has a circular cross section.

[0039] The quartz tube 10 needs to be made into a finished tube, so usually an extended welded tube 1001 is hot-melt welded at both ends of the quartz tube 10 for clamping or other surface contact operations. The non-circular segment 904 has a rectangular cross-section, and the central quartz tube 10 is attached to the outer surface of the non-circular segment 904 under the action of negative pressure. The extended welded tube 1001 is a transition section and is not completely deformed. After cooling and forming, the graphite rod 9 can be pulled out and the extended welded tubes 1001 at both ends can be cut off.

[0040] Since the graphite powder on the outside of the graphite rod 9 is fine and smooth, when the graphite rod 9 is not inserted into the quartz tube 10 for a long time, it is not difficult to extract it from the deformed quartz tube 10.

[0041] In a preferred solution, the graphite rod 9 is a hollow structure, the non-circular segment 904 is broken in the middle to form two half segments 905 , and a central shaft 11 is sleeved inside the graphite rod 9 .

[0042] When the quartz tube 10 is long, the graphite rod 9 cannot be prevented from getting stuck. The graphite rod 9 is divided into two ends from the middle and supported by the central axis 11. After the quartz tube 10 is deformed, the non-circular segments 904 are pulled out from both ends, which is more labor-saving.

[0043] In the preferred embodiment, a recessed groove structure 906 is provided at the central break of the non-circular segment 904, the half segment 905 includes a central segment 901 and a side segment 902, the side segment 902 is connected to the end shaft portion 903, and a protrusion 1101 is provided at the recessed groove structure 906 of the non-circular segment 904 in the center of the central axis 11.

[0044] The non-circular segment 904 is divided into two segments again, and the entire graphite rod 9 is divided into four segments, and the side segment 902 at the outer end is pulled out along with the end shaft portion 903. The central segment 901 in the middle can be pulled out on one side of the central segment 901 by pulling the central shaft 11, and the protrusion 1101 squeezes the sink structure 906, and then pushes the central shaft 11, and the protrusion 1101 pushes out the other central segment 901.

[0045] In a preferred embodiment, the sealing plug 7 includes a basic sleeve 702 , which is provided with an outer ring sealing ring 703 and an inner ring sealing ring 704 . The outer side of the outer ring sealing ring 703 abuts against the inner wall of the raised portion 1101 , and the inner side of the inner ring sealing ring 704 abuts against the outer wall of the end shaft portion 903 .

[0046] The outer sealing ring 703 and the inner sealing ring 704 can be made of rubber or silicone.

[0047] Since the graphite rod 9 can be processed in one piece, the coaxiality of the end shaft portion 903 and the non-circular segment 904 can be guaranteed. However, due to the large deformation generated during welding and cooling of the extended welded tube 1001 and the quartz tube 10, there may be a slight deviation in the coaxiality. Therefore, when making the sealing plug 7, the coaxiality of the non-circular segment 904 and the quartz tube 10 cannot be judged by the coaxiality of the end shaft portion 903 and the extended welded tube 1001. Therefore, in actual operation, the coaxiality of the end shaft portion 903 and the quartz tube 10 can be detected by a micrometer, and the coaxiality of the graphite rod 9 and the quartz tube 10 can be adjusted. Therefore, the final axial position of the end shaft portion 903 and the extended welded tube 1001 is random, which poses a great challenge to the sealing ability and adjustable amount of the sealing plug 7.

[0048] In the preferred embodiment, a slope surface 705 is provided on the outer side of the basic sleeve 702, one side of the outer ring sealing ring 703 is pressed against the slope surface 705, a reverse slope surface 706 is provided on the inner side of the basic sleeve 702, one side of the inner ring sealing ring 704 is pressed against the reverse slope surface 706, the basic sleeve 702 is provided with an outer sleeve 709 and an inner sleeve 710, a first push rod 711 and a second push rod 712 are respectively provided with threaded connections on the bottom walls of the outer sleeve 709 and the inner sleeve 710, an outer push ring 707 is provided between the outer ring sealing ring 703 and the first push rod 711, and the first push rod 712 is provided with a threaded connection on the bottom walls of the outer sleeve 709 and the inner sleeve 710. The rod 711 pushes the outer push ring 707 to squeeze the outer ring sealing ring 703. An inner push ring 708 is provided between the inner ring sealing ring 704 and the second push rod 712. The second push rod 712 pushes the inner push ring 708 to squeeze the inner ring sealing ring 704. The side wall of the outer sleeve 709 is circumferentially provided with a plurality of first adjusting rods 713 with threaded connections. One end of the first adjusting rod 713 rests on the outer wall of the extended welded pipe 1001. The side wall of the inner sleeve 710 is circumferentially provided with a plurality of second adjusting rods 714. One end of the second adjusting rod 714 rests on the outer wall of the end shaft portion 903.

[0049] The center of the bottom wall of the outer sleeve 709 and the inner sleeve 710 is hollowed out, and soft material blocks are provided at the contact ends of the first adjustment rod 713 and the second adjustment rod 714 with the extended welding pipe 1001 and the end shaft 903 to increase the contact area and reduce the push-up damage.

[0050] In a preferred embodiment, a clamping portion 715 is provided at one end of the outer sleeve 709 away from the quartz tube 10 .

[0051] In a preferred solution, one end of the basic sleeve 702 inserted into the extended welded pipe 1001 is provided with a detachable hollow end sleeve 13 , and the slope surface 705 is provided on the hollow end sleeve 13 .

[0052] The conical end sleeve of the basic sleeve 702 can be designed to be separated and assembled, and can be disassembled from the main body of the basic sleeve 702 to adapt to the inner diameter of different quartz tubes 10. The minimum inscribed circle diameter of the non-circular segment 904 is larger than the diameter of the end shaft portion 903. The diameter of the end shaft portion 903 can be customized to a fixed size. Therefore, the inner push ring 708, the inner ring sealing ring 704 and other parts matching the end shaft portion 903 do not need to be replaced.

[0053] A dovetail groove 716 is formed on the inner wall of the basic sleeve 702 , and one end of the inner ring sealing ring 704 is clamped in the dovetail groove 716 .

[0054] After the quartz tube 10 and the extended welding tube 1001 are welded, the graphite rod 9 and the center axis 11 are inserted into the quartz tube 10, the sealing plugs 7 are installed at both ends of the extended welding tube 1001 to slightly fix the graphite rod 9, and a ring 14 is sleeved on the clamping part 715, and the outer diameter of the ring 14 is equal to the outer diameter of the quartz tube 10.

[0055] Two rotating brackets are arranged on the marble platform 16 and hold the two ends of the quartz tube 10 .

[0056] A marble ruler 15 nearly parallel to the axis of the quartz tube 10 is arranged on the marble platform 16, the dial base is placed against the marble ruler 15, the micrometer base is moved, the dial needle hits the outer wall of the quartz tube 10, and the marble ruler 15 is adjusted to be flush with the axis of the quartz tube 10 according to the degree.

[0057] Move the dial base against the marble ruler 15 until the needle hits the outer wall of the ring 14 of the clamping part 715, rotate the quartz tube 10 so that the clamping part 715 and the ring 14 rotate accordingly, adjust each first adjustment rod 713 so that when the micrometer reading remains unchanged, the basic sleeve 702 is coaxial with the quartz tube 10.

[0058] Move the needle to the outer wall of the end shaft 903, rotate the quartz tube 10, and the graphite rod 9 rotates accordingly. Adjust each second adjustment rod 714 so that when the micrometer reading remains unchanged, the end shaft 903 is coaxial with the quartz tube 10.

[0059] Finally, the first push rod 711 and the second push rod 712 are rotated to squeeze the outer ring sealing ring 703 and the inner ring sealing ring 704, so that the outer ring sealing ring 703 blocks the gap between the basic sleeve 702 and the inner wall of the extended welding pipe 1001, and the inner ring sealing ring 704 blocks the gap between the inner wall of the basic sleeve 702 and the outer wall of the end shaft part 903.

[0060] The preparation method includes: selecting a sealing plug 7, a graphite rod 9, a quartz tube 10 and an extended welding tube 1001 of appropriate specifications; Connect the extended welding tube 1001 to both ends of the quartz tube 10; Insert the graphite rod 9 into the quartz tube 10 and install the sealing plug 7 to form an integrated sleeve; The integrated sleeve is placed on the bed 1, and the chuck fixture 6 clamps the two ends of the integrated sleeve; The chuck fixture 6 on the fixed seat 2 and the movable seat 3 rotate synchronously; Start the heating torch 5 to preheat the quartz tube 10; The negative pressure is turned on to evacuate the cavity between the quartz tube 10 and the graphite rod 9, and at the same time, the heating torch 5 moves from the end of the quartz tube 10 away from the exhaust to the end close to the exhaust; The quartz tube 10 shrinks until it is close to the outer wall of the graphite rod 9; Wait for the quartz tube 10 to cool down, remove and cut off the extended welded tube 1001.

[0061] Embodiment 2: A horizontal melting and shrinking method for forming a glass tube. 1. The main equipment required is a fire bed and a vacuum pump, and the main materials required are a round quartz tube, a round quartz extension tube, and a graphite core.

[0062] The above-mentioned fire bed is mainly composed of a bed, a carrier, a quartz lamp holder and a hydrogen and oxygen flow control system. The bed is the main structure of the fire bed, which is used to place quartz materials and perform heat processing. The bed has mechanical claws at both ends to clamp the quartz tube and can rotate at a constant speed according to the set value. The carrier can move back and forth between the claws at both ends on the guide rail of the bed at a set speed. A quartz lamp holder is installed on the carrier, and the quartz lamp holder burns hydrogen and oxygen to heat the quartz tube under the control of an external hydrogen and oxygen flow control system.

[0063] The function of the vacuum pump is to evacuate the inside of the quartz tube so that when the viscosity of the quartz tube decreases due to heat, it can melt and collapse inward due to the pressure difference between the inside and outside of the tube. The shape of the collapse depends on the shape of the graphite core inside the tube.

[0064] The round quartz tube is a quartz tube outside the graphite core, and is the material processed into tubes of various shapes by this method.

[0065] Both ends of the quartz tube are connected with quartz extension tubes. The extension tubes are used to increase the length of the tube to facilitate the clamping of the fire bed and to match the sealing chuck of the quartz tube and the vacuum connection chuck.

[0066] The following takes a square quartz tube with an inner hole of 16.75 mm and an outer diameter of 21.15 as an example to illustrate its manufacturing process.

[0067] Step 1: Select a suitable circular quartz tube according to the required cross-sectional area of ​​the quartz tube. The quartz tube selected in this embodiment has an outer diameter of 29 mm, a wall thickness of 2 mm, and a length of 900 mm; the extension tubes connected to both ends of the quartz tube have an outer diameter of 50 mm, a wall thickness of 3 mm, and a length of 500 mm. The required graphite core rod has a square cross-section with a side length of 16.5 mm and a length that is consistent with the length of the quartz tube, which is 900 mm; Step 2: Insert the square graphite core rod into the quartz tube connected to the extension tube; Step 3: Install sealing chucks and vacuum connection chucks on both ends of the graphite core and the quartz tube, and fix the graphite rod and the quartz tube through the chucks at both ends to make them completely concentric; Step 4: Place the quartz tube with the chucks installed on both ends onto the mechanical claws of the fire bed, release the stress, tighten the claws, and fix the quartz tube; Step 5: Ignite the hydrogen and oxygen flowing out of the quartz lamp holder, and move the lamp holder to preheat the quartz tube through the hydrogen and oxygen flame combustion. The total flow rate of hydrogen in the preheating quartz lamp holder is 60slm, the total flow rate of oxygen is 30slm, and the moving speed of the lamp holder is 80mm / min; Step 6: After preheating, the quartz lamp holder returns to the starting point of the quartz tube near the sealing chuck end, and the quartz tube is heated by a high fire. At this time, the total flow rate of hydrogen in the quartz lamp holder is 90slm, and the total flow rate of oxygen is 45slm. The heated quartz tube shrinks inward, close to the square graphite core inside, and finally burns solid; Step 7: Turn on the vacuum pump to evacuate the inside of the quartz tube, and at the same time, the lamp holder starts to move uniformly from one end of the quartz tube to the other end at a speed of 35 mm / min. The flow rates of hydrogen and oxygen in the quartz lamp holder remain the same as in step 6; Step 8: During the process of moving the quartz lamp holder, the entire quartz tube and the graphite core are burned into one. At this time, the shape of the quartz tube is consistent with the shape of the graphite rod and becomes a square; Step 9: After sintering is completed, wait for the quartz tube to completely cool down and remove it from the fire bed, extract the graphite core in the middle, cut off the extension tubes at both ends, and the uniform part in the middle is a square quartz tube with an inner hole of 16.75mm and an outer diameter of 21.15.

[0068] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A hollow non-circular glass tube preparation system, characterized by: The invention comprises a bed (1), a connection seat for connecting two ends of a quartz tube (10) is provided on the bed (1), a carrier (4) movable along the length direction of the quartz tube (10) is provided on the bed (1), a heating torch (5) is provided on the carrier (4), the heating torch (5) is aimed at the quartz tube (10), a graphite rod (9) is provided in the quartz tube (10), a gap cavity is provided between the outer wall of the graphite rod (9) and the inner wall of the quartz tube (10), two ends of the graphite rod (9) are connected to the connection seat, two ends of the graphite rod (9) and the quartz tube (10) are provided with sealing plugs (7), and a negative pressure air pipe (8) is provided, and the negative pressure air pipe (8) is communicated with the gap cavity between the graphite rod (9) and the quartz tube (10).

2. The hollow non-circular glass tube preparation system according to claim 1, characterized in that: The connecting seat comprises a fixed seat (2) and a movable seat (3), and a rotatable chuck fixture (6) is provided on the fixed seat (2) and the movable seat (3), and the chuck fixture (6) is used to position the two ends of the quartz tube (10).

3. The hollow non-circular glass tube preparation system according to claim 1, characterized in that: The graphite rod (9) comprises a non-circular segment (904), and end shaft portions (903) are provided at both ends of the non-circular segment (904). The end shaft portions (903) are sleeved with a sealing plug (7). Extended welding tubes (1001) are provided at both ends of the quartz tube (10), and the length of the non-circular segment (904) is greater than the length of the quartz tube (10).

4. The hollow non-circular glass tube preparation system according to claim 3, characterized in that: The graphite rod (9) is a hollow structure, the non-circular segment (904) is broken in the middle to form two half segments (905), and a central shaft (11) is sleeved inside the graphite rod (9).

5. The hollow non-circular glass tube preparation system according to claim 4, characterized in that: A recessed groove structure (906) is provided at the central break of the non-circular segment (904); the half segment (905) comprises a central segment (901) and a side segment (902); the side segment (902) is connected to the end shaft portion (903); and a protrusion (1101) is provided at the center of the central shaft (11) at the recessed groove structure (906) of the non-circular segment (904).

6. The hollow non-circular glass tube preparation system according to claim 3, characterized in that: The sealing plug (7) comprises a basic sleeve (702), wherein the basic sleeve (702) is provided with an outer ring sealing ring (703) and an inner ring sealing ring (704), wherein the outer side of the outer ring sealing ring (703) abuts against the inner wall of the raised portion (1101), and the inner side of the inner ring sealing ring (704) abuts against the outer wall of the end shaft portion (903).

7. The hollow non-circular glass tube preparation system according to claim 6, characterized in that: The outer side of the basic sleeve (702) is provided with a slope surface (705), one side of the outer ring sealing ring (703) is pressed against the slope surface (705), the inner side of the basic sleeve (702) is provided with a reverse slope surface (706), one side of the inner ring sealing ring (704) is pressed against the reverse slope surface (706), the basic sleeve (702) is provided with an outer sleeve (709) and an inner sleeve (710), the bottom walls of the outer sleeve (709) and the inner sleeve (710) are respectively provided with a first push rod (711) and a second push rod (712) which are threadedly connected, an outer push ring (707) is provided between the outer ring sealing ring (703) and the first push rod (711), and the first push rod ( The outer push ring (707) is pushed by the second push rod (711) to extrude the outer ring sealing ring (703); an inner push ring (708) is provided between the inner ring sealing ring (704) and the second push rod (712); the second push rod (712) pushes the inner push ring (708) to extrude the inner ring sealing ring (704); a plurality of first adjustment rods (713) connected by threads are provided along the circumferential direction on the side wall of the outer sleeve (709); one end of the first adjustment rod (713) abuts against the outer wall of the extended welding pipe (1001); a plurality of second adjustment rods (714) are provided along the circumferential direction on the side wall of the inner sleeve (710); one end of the second adjustment rod (714) abuts against the outer wall of the end shaft portion (903).

8. The hollow non-circular glass tube preparation system according to claim 7, characterized in that: A clamping portion (715) is provided at one end of the outer sleeve (709) away from the quartz tube (10).

9. The hollow non-circular glass tube preparation system according to claim 7, characterized in that: One end of the basic sleeve (702) inserted into the extended welded pipe (1001) is provided with a detachable hollow end sleeve (13), and the slope surface (705) is provided on the hollow end sleeve (13).

10. The method for preparing the hollow non-circular glass tube preparation system according to claim 2, characterized in that: Selecting a sealing plug (7), a graphite rod (9), a quartz tube (10) and an extended welding tube (1001) of appropriate specifications; Connecting the extended welding tube (1001) to both ends of the quartz tube (10); Inserting the graphite rod (9) into the quartz tube (10) and installing the sealing plug (7) to form an integrated sleeve; The integrated sleeve is placed on the bed (1), and the chuck fixture (6) clamps the two ends of the integrated sleeve; The chuck fixture (6) on the fixed seat (2) and the movable seat (3) rotate synchronously; Starting the heating torch (5) to preheat the quartz tube (10); The negative pressure is turned on to evacuate the cavity between the quartz tube (10) and the graphite rod (9), and at the same time, the heating torch (5) is moved from the end of the quartz tube (10) away from the exhaust to the end close to the exhaust; The quartz tube (10) shrinks until it is close to the outer wall of the graphite rod (9); Wait for the quartz tube (10) to cool down, remove and cut off the extended welded tube (1001).

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