Hollow quartz cylinder manufacturing device and method

Abstract

The invention discloses a manufacturing device for a hollow quartz cylinder. The manufacturing device comprises a rack, a metal cylinder, a transmission mechanism, a heating mechanism and a feeding system, the metal cylinder is horizontally arranged, and the bottom of the metal cylinder is supported above the rack through a supporting piece; the transmission mechanism is mounted on the rack; the driving end of the transmission mechanism is connected with the center of one end of the metal cylinder to drive the metal cylinder to rotate; the heating systems are arranged at the two ends of the metal cylinder correspondingly and used for heating the metal cylinder. The feeding system comprises a feeding gun, a feeding valve, an inner-layer material feeding assembly and an outer-layer material feeding assembly, wherein the inner-layer material feeding assembly and the outer-layer material feeding assembly are communicated with the feeding valve. The invention also discloses a manufacturing process of the hollow quartz cylinder. The device has the beneficial effects that heat insulation and heat preservation can be effectively carried out on a temperature zone, the heating heat loss is reduced, the energy consumption is reduced, the volatilization amount of quartz sand is reduced, and the finished product quality of the quartz cylinder is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of optical fibers, and in particular to a hollow quartz tube manufacturing device and method. Background Art

[0002] At present, there are three main process methods for manufacturing hollow quartz tubes (rings) in the industry: one is to prepare the quartz ingot and then obtain the quartz ring material by material processing; the second is to melt the quartz sand directly by continuous melting and pulling process, and use the external former and forming core rod below the outlet to make the molten material into a hollow tube; the third is to use plasma arc as the heat source, and use centrifugal rotation to melt and form, and then prepare the hollow quartz tube in one step. The first method has a long processing flow, more waste, high processing cost, and low masterbatch yield. The second method requires the configuration of internal and external formers of various sizes, the equipment and spare parts are too complicated, and the product size change cycle is long. The third method is a method for preparing a quartz tube, as introduced in U.S. Patent No. 5,312,471. The quartz tube is prepared by feeding and melting layer by layer, but the feeding point is fixed. The viscosity is reduced by high-temperature melting to make it flatten naturally. This method has high temperature, high energy consumption, and large volatilization volume. When the equipment container is too long, the sand material will accumulate in a certain area after feeding. The high-temperature viscosity of the quartz liquid is high, and it is difficult to ensure that the inner wall of the quartz tube is completely flattened. This will result in low quality of the finished quartz tube and even defective products. Summary of the invention

[0003] The purpose of the present invention is to provide a hollow quartz tube manufacturing device and method to address the deficiencies of the prior art, so as to save energy consumption and improve the quality of the finished quartz tube.

[0004] The technical solution adopted by the present invention is: a hollow quartz tube manufacturing device, comprising:

[0005] Frame, metal cylinder, transmission mechanism, heating mechanism and feeding system;

[0006] The metal cylinder is arranged horizontally, and the bottom is supported above the frame by a support member;

[0007] The transmission mechanism is installed on the frame; the driving end of the transmission mechanism is connected to the center of one end of the metal cylinder to drive the metal cylinder to rotate;

[0008] The heating systems are respectively arranged at both ends of the metal cylinder to heat the metal cylinder;

[0009] The feeding system includes a feeding gun, a feeding valve, and an inner layer material feeding assembly and an outer layer material feeding assembly respectively connected to the feeding valve; the feeding gun is arranged on a frame, and is connected to a horizontal driving mechanism. Driven by the horizontal driving mechanism, the feeding gun reciprocates along the axial direction of the metal cylinder, so that the inner end of the feeding gun extends into the metal cylinder to feed the material; the outer end of the feeding gun is connected to a compressed air pipeline, and the outer end of the feeding gun is also connected to the outlet of the feeding valve through a pipeline. The feeding valve is provided with two outlets, one of which is connected to the inner layer material feeding assembly, and the other is connected to the outer layer material feeding assembly.

[0010] According to the above scheme, the transmission mechanism includes a transmission motor, a transmission box, a flange and a rotary sealing support; the motor shaft of the transmission motor is connected to the input end of the transmission box, the output end of the transmission box is connected to one end face of the flange, and the other end face of the flange is fixed to the end of the metal cylinder; a rotary sealing support is arranged on the inner side of the transmission box.

[0011] According to the above scheme, the heating mechanism includes two electrodes fixed at both ends of the metal cylinder, and a power supply connected to the electrodes; the electrodes are hollow inside and arranged horizontally, and the feeding gun passes through the electrodes; a jacket is provided outside the electrodes, and cooling water flows through the jacket.

[0012] According to the above scheme, the inner layer material feeding assembly and the outer layer material feeding assembly are structurally connected, and each includes a filling hopper, a feeding pipe and a filling valve. The bottom outlet of the filling hopper is connected to the upper end of the feeding pipe, and the feeding pipe is provided with a filling valve; the lower ends of the feeding pipes of the inner layer material feeding assembly and the outer layer material feeding assembly are respectively connected to the feeding valves.

[0013] According to the above scheme, the frame has two groups, namely the first frame and the second frame; the frame includes a body and a base, and the body is welded to the body; the transmission mechanism is arranged on the body of the first frame; the metal cylinder is arranged on the body of the first frame through a support; the horizontal driving mechanism of the feeding gun is installed on the body of the second frame.

[0014] The present invention also adopts a quartz tube manufacturing method, which comprises the following steps:

[0015] Step 1: Rotate the metal cylinder;

[0016] Step 2: Feed the outer layer material into the metal cylinder: the feeding valve is switched to connect the feeding pipe of the outer layer material feeding assembly with the feeding gun, and the feeding end of the feeding gun reciprocates axially in the metal cylinder to feed the outer insulation layer particles into the metal cylinder, so that the outer insulation layer particles are evenly attached to the inner wall of the metal cylinder under the action of centrifugal force;

[0017] Step 3: Feed the inner layer of quartz sand into the metal cylinder: replace the feeding pipe of the feeding gun, and then switch the feeding valve to connect the feeding pipe of the inner layer material feeding assembly with the feeding gun, so that the feeding end of the feeding gun moves axially back and forth in the metal cylinder, and the quartz sand is fed into the metal cylinder. The quartz sand is evenly distributed axially in the outer insulation layer particles;

[0018] Step 4: Heat up and melt to complete the melting of the quartz sand layer of the inner layer material;

[0019] Step 6: Cool down and trim the quartz tube.

[0020] According to the above scheme, the rotation speed of the metal cylinder is 400-1500 rad / min.

[0021] According to the above scheme, the particle size of the outer layer material is 1-5 mm; the filling speed of the outer layer material is 20-50 kg / min; and the moving speed of the feeding gun is 1000 mm / min.

[0022] According to the above scheme, the filling speed of the inner layer material is 5-30kg / min; the moving speed of the feeding gun is 1000mm / min.

[0023] According to the above scheme, the particle size of the outer layer material is 1-5mm, the particle size of the inner layer material is 60-300um, and the product of the particle size of the outer layer material and the inner layer material is 0.3mm 2 .

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention first lays the external heat-insulating granular material inside the metal cylinder, and then lays the quartz sand. Compared with the method of directly laying quartz sand inside the metal cylinder in the prior art, the present invention can effectively insulate the temperature zone, reduce the heat loss of heating, save energy consumption, and reduce the volatilization of quartz sand, thereby ensuring the quality of the finished product of the quartz cylinder;

[0026] 2. In the present invention, the metal cylinder is rotated first, and then the outer insulation layer material and quartz sand are laid, and the insulation material is granular (avoiding the original block or solid overall structure). This design reduces the weight of the metal cylinder and reduces the torque load of the transmission mechanism;

[0027] 3. The method of rotating first and then filling in the present invention can avoid the contact contamination problem between the inner quartz sand material and the outer metal tube, specifically solves the high requirements of high-purity quartz products on product purity, improves product purity, and ensures the quality of the finished product of the quartz tube;

[0028] 4. The present invention first lays a layer of heat-insulating material on the inner layer of the metal cylinder, which can enhance gas flow, improve air permeability, and facilitate the removal of bubbles during the melting process;

[0029] 5. When laying the thermal insulation material and quartz sand, the feeding gun reciprocates axially at a uniform speed in the metal cylinder, ensuring that the thermal insulation material and quartz sand are laid uniformly in the axial direction of the metal cylinder, which is beneficial to the uniformity of the overall temperature and product;

[0030] 6. Two sets of feeding components are designed in the present invention, and the inner layer material and the outer layer material are transported through these two sets of feeding components respectively. The feeding gun and the feeding pipe are replaced when the inner layer material (that is, quartz sand material) is transported, and there is a replaceable high-purity quartz tube inside the inner layer material feeding gun as a feeding channel, which can ensure the high purity of the inner layer material and avoid the problem of introducing additional impurities.

[0031] 7. The method of preparing the quartz tube by plasma arc heating in the present invention can avoid the impurity pollution problem caused by the volatilization of solid heaters such as graphite heating at high temperature.

[0032] 8. In the present invention, the particle sizes of the outer layer material and the inner layer material are limited respectively, which is beneficial to the degassing and heat preservation effect of the gap between the inner layer materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention.

[0034] Among them: 1. Body; 2. Base; 3. DC power supply; 4. Transmission motor; 5. Transmission box; 6. Transmission flange; 7. Rotary seal support; 8. Metal cylinder; 9. Support wheel; 10. Electrode; 11. Filling hopper; 12. Feeding pipe; 13. Filling valve; 14. Feeding gun; 15. Horizontal drive mechanism; 16. Compressed air pipeline; 17. Feeding valve. DETAILED DESCRIPTION

[0035] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] like Figure 1 A hollow quartz tube manufacturing device is shown, comprising:

[0037] Frame, metal cylinder 8, transmission mechanism, heating mechanism and feeding system;

[0038] The metal cylinder 8 is arranged horizontally, and the bottom is supported above the frame by a support member;

[0039] The transmission mechanism is installed on the frame; the driving end of the transmission mechanism is connected to the center of one end of the metal cylinder 8, driving the metal cylinder 8 to rotate;

[0040] The heating system is respectively arranged at both ends of the metal cylinder 8 to heat the metal cylinder 8;

[0041] The feeding system includes a feeding gun 14, a feeding valve 17, and an inner layer material feeding assembly and an outer layer material feeding assembly respectively connected to the feeding valve 17; the feeding gun 14 is arranged on the frame, and is connected to the horizontal driving mechanism 15. Under the drive of the horizontal driving mechanism 15, the feeding gun 14 reciprocates along the axial direction of the metal cylinder 8, so that the inner end of the feeding gun 14 extends into the metal cylinder 8 to feed the material; the outer end of the feeding gun 14 is connected to the compressed air pipeline 16, and the outer end of the feeding gun 14 is also connected to the outlet of the feeding valve 17 through a pipeline. The feeding valve 17 is provided with two outlets, one of which is connected to the inner layer material feeding assembly, and the other is connected to the outer layer material feeding assembly; Figure 1 The diagram shows the outer layer material feeding assembly.

[0042] In the present invention, the transmission mechanism drives the metal cylinder 8 to rotate; the inner layer material feeding assembly and the outer layer material feeding assembly respectively provide the inner layer material (that is, quartz sand material) and the outer layer material (that is, the insulation layer granular material, avoiding the selection of the original block or solid integral structure) into the feeding gun 14, and the feeding gun 14 feeds the inner layer material and the outer layer material into the metal cylinder 8; the feeding gun 14 is a hollow structure, with a removable and replaceable conveying pipe embedded inside, and a high-purity quartz glass tube made of the same material as the inner layer material is used as the conveying pipe for conveying the inner layer material, which not only ensures the convenience of operation, but also avoids the problem of cross-contamination of impurities between the outer layer material and the inner layer material, thereby ensuring the high purity of the inner layer material.

[0043] Preferably, the transmission mechanism includes a transmission motor 4, a transmission box 5, a flange 6 and a rotary sealing support 7; the motor shaft of the transmission motor 4 is connected to the input end of the transmission box 5, the output end of the transmission box 5 (located on the inner side of the transmission box 5) is connected to one end face of the flange 6, and the other end face of the flange 6 is fixed to the end of the metal cylinder 8; the rotary sealing support 7 is arranged on the inner side of the transmission box 5.

[0044] In the present invention, the transmission motor 4 is powered by a power supply; the motor shaft of the transmission motor 4 drives the flange 6 to rotate through the transmission box 5, and then drives the metal cylinder 8 to rotate; two groups of transmission mechanisms are set, respectively located at the two ends of the metal cylinder 8.

[0045] Preferably, the heating mechanism is plasma arc heating, which includes two electrodes 10 respectively fixed at both ends of the metal cylinder 8, and a DC power supply 3 connected to the electrode 10; the electrode 10 is hollow inside and arranged horizontally, and the feed gun 14 passes through the electrode 10; a jacket is provided outside the electrode 10, and cooling water flows through the jacket. In the present invention, the electrode 10 is powered by a power supply; the inner end of the electrode 10 passes through the rotary seal support 7, the transmission box 5 and the flange 6 in sequence, and extends into the interior of the metal cylinder 8. The electrode 10 is also provided with a jacket, and the interior of the jacket is connected to the cooling water for cooling and protecting the electrode 10.

[0046] In the present invention, the horizontal driving mechanism 15 for driving the feeding gun 14 to move axially can be a translation driving motor, which is a conventional technology and will not be described in detail here.

[0047] In the present invention, the inner layer material feeding assembly and the outer layer material feeding assembly are connected in structure and configuration, and each of them includes a filling hopper 11, a feeding pipe 12 and a filling valve 13. The bottom outlet of the filling hopper 11 is connected to the upper end of the feeding pipe 12, and the feeding pipe 12 is provided with a filling valve 13; the lower ends of the feeding pipes 12 of the inner layer material feeding assembly and the outer layer material feeding assembly are respectively connected to the feeding valve 17. Quartz sand is filled into the filling hopper 11 of the inner layer material feeding assembly, and the outer insulation layer granular material is filled into the filling hopper 11 of the outer layer material feeding assembly.

[0048] In the present invention, the feeding valve 17 is a four-way valve; the horizontal driving mechanism 15 provides power to make the feeding gun 14 move back and forth along the direction of the electrode 10; the feeding gun 14 is hollow inside and is connected to the feeding pipeline and the compressed air pipeline respectively, and the compressed air provides power for feeding. Under constant air pressure and air flow, by controlling the moving speed of the feeding gun 14, it can be ensured that the metal cylinder 8 can be evenly covered with quartz sand in the circumference.

[0049] In the present invention, the frame includes a body 1 and a base 2, and the body 1 is welded on the body 1. The frame has two groups, namely the first frame and the second frame; the transmission mechanism is arranged on the body 1 of the first frame; the metal cylinder 8 is arranged on the body 1 of the first frame through a support. The horizontal driving mechanism 15 of the feeding gun 14 is installed on the body 1 of the second frame. The support member includes a support wheel 9 driven by a cylinder to rise and fall, and the support wheel 9 is located at the bottom of the metal cylinder 8 to support the metal cylinder 8.

[0050] A method for manufacturing a quartz cylinder based on the device as described above, the process comprising the following steps:

[0051] Step 1, rotating the metal cylinder 8: starting the transmission mechanism to drive the metal cylinder 8 to rotate;

[0052] Step 2: feeding the outer layer material (i.e., the insulation layer granular material) into the metal cylinder 8: the feeding valve 17 is switched to connect the feeding pipe 12 of the outer layer material feeding assembly with the feeding gun 14, and the feeding end of the feeding gun 14 reciprocates axially in the metal cylinder 8 to feed the outer insulation layer granules into the metal cylinder 8. The outer insulation layer granules are evenly attached to the inner wall of the metal cylinder 8 under the action of centrifugal force;

[0053] Step 3: Feed the inner layer of quartz sand into the metal cylinder 8: Replace the feeding pipe of the feeding gun 14, and then switch the feeding valve 17 to connect the feeding pipe 12 of the inner layer material feeding assembly with the feeding gun 14, so that the feeding end of the feeding gun 14 reciprocates axially in the metal cylinder 8, and feed the quartz sand into the metal cylinder 8. The quartz sand is evenly distributed axially in the outer insulation layer particles;

[0054] Step 4, heating and melting: using the DC power supply 3 to start the arc, using the high temperature of the plasma arc to melt the quartz sand layer of the inner layer material layer by layer, so that the quartz sand layer of the inner layer material is completely melted;

[0055] Step 6, cooling and trimming the quartz tube: After the quartz sand layer is completely melted, the arc power supply is turned off to cool the quartz tube; when the temperature drops to a temperature at which the metal tube 8 can be disassembled, the metal tube 8 is disassembled, the quartz tube is taken out, and the shape is trimmed to meet the size requirements.

[0056] In step 1, after the metal cylinder 8 and the flanges 6 at both ends are connected and fixed, the transmission mechanism is started to rotate the metal cylinder 8 at a high speed of 400 to 1500 rad / min.

[0057] In step 2, the material of the outer insulation layer is zirconium oxide, or coarse-grained quartz sand with the same composition as the inner quartz sand but with a slightly lower purity and larger particle size; the particle size of the outer layer material (i.e., the outer insulation layer particles) is 1 to 5 mm. The filling speed of the outer layer material is selected to be 20-50 kg / min, and the optimal speed is 30 kg / min; the moving speed of the feeding gun 14 is 1000 mm / min.

[0058] In step 3, the inner layer material feeding assembly and feeding system are used to feed the quartz sand into the metal cylinder 8, and the quartz sand is evenly distributed in the horizontal direction in the outer layer insulation material. In step 3, the quartz sand is laid according to the thickness of the target product. The filling speed of the inner layer material (i.e., quartz sand) is 5-30 kg / min, and the optimal speed is 10 kg / min; the moving speed of the feeding gun 14 is 1000 mm / min.

[0059] In step 4, the arc is started using a DC power supply 3, and the high temperature of the plasma arc is used to melt the quartz sand layer by layer;

[0060] In step five, after the quartz sand layer in the previous step is completely melted, the arc power supply is turned off to cool the quartz tube; when the temperature drops to a temperature at which the metal tube 8 can be disassembled, the metal tube 8 is disassembled, the quartz tube is taken out, and the shape is trimmed to meet the size requirements.

[0061] In the present invention, based on the generally applicable particle size range of granular thermal insulation materials, the particle size of the outer layer material is generally 1-5 mm, the particle size of the inner layer material is 60-300 um, and the product of the particle size (in millimeters) of the outer layer material and the inner layer material is 0.3, that is, φ outer layer material particle size (mm) × φ inner layer material particle size (mm) = 0.3 mm 2 This is beneficial to the degassing of the gap between the inner layer materials and the thermal insulation effect and the stability of the structure. In the present invention, the outer layer thermal insulation material needs to be coarser than the inner layer thermal insulation material, and the thermal insulation effect is better; but when the particle size of the inner layer material is large, the outer layer material cannot be too large, and the present invention limits the two particle sizes to ensure the stability of the inner and outer layer stacking connection.

[0062] The present invention can coordinate the thickness of the outer layer insulation material and the inner layer quartz sand material according to the required product size, so as to prepare a quartz tube with a size close to the target size, thereby greatly reducing the amount of later processing and material loss.

[0063] The present invention can prepare both transparent quartz tubes and opaque quartz tubes.

[0064] Embodiment 1

[0065] 1. After installing the metal cylinder 8 with an inner diameter of 600 mm and a length of 2500 mm, start the transmission mechanism to rotate the metal cylinder 8 at a high speed of 500 rad / min;

[0066] 2. Use the feeding system to evenly feed zirconium oxide particles with a diameter of 1 to 4 mm into the rotating metal cylinder 8, so that the zirconium oxide particles are evenly laid to form an outer ring insulation layer with an outer diameter of 600 mm, an inner diameter of 500 mm, and a length of 2500 mm. The weight of the zirconium oxide particles is about 300 kg;

[0067] 3. Use the feeding system to evenly feed high-purity quartz sand into the metal cylinder 8, so that the quartz sand particles are evenly laid to form a sand layer with an outer diameter of 500mm, an inner diameter of 340mm, and a length of 2500mm. The input weight of the high-purity quartz sand is about 400kg;

[0068] 4. Utilize the high temperature of the plasma arc of the heating mechanism to gradually melt the quartz sand layer, and finally melt all the quartz sand layers of the inner layer;

[0069] 5. The plasma arc is powered off, and the metal cylinder 8 keeps rotating until the temperature drops to an operable temperature, then stops rotating, disassembles the metal cylinder 8, and takes out the hollow quartz cylinder inside;

[0070] 6. The quartz tube is trimmed to meet the requirements. The size of the quartz tube is 490mm in outer diameter, 390mm in inner diameter and 2300mm in length. After inspection, the inner and outer diameters of the quartz tube are uniform, and there are no impurities and few bubbles inside.

[0071] Embodiment 2

[0072] 1. After installing the metal cylinder 8 with an inner diameter of 500 mm and a length of 2500 mm, start the transmission mechanism to rotate the metal cylinder 8 at a high speed of 600 rad / min;

[0073] 2. Use the feeding system to feed low purity quartz sand (SiO 2 The quartz sand particles (with a purity of more than 99.9% but lower than the purity of the inner layer material) are uniformly fed into the rotating metal cylinder 8 and evenly laid to form an outer insulation layer with an outer diameter of 500mm, an inner diameter of 440mm and a length of 2500mm. The weight of the quartz sand particles is about 170kg;

[0074] 3. Use the feeding system to evenly feed high-purity quartz sand into the metal cylinder 8, so that the quartz sand particles are evenly laid into a sand layer with an outer diameter of 440 mm, an inner diameter of 300 mm, and a length of 2500 mm. The weight of the high-purity quartz sand input is about 300 kg;

[0075] 4. Use the high temperature of the plasma arc of the heating system to gradually melt the inner layer material (quartz sand layer), and finally melt all the inner layer material quartz sand layer;

[0076] 5. The plasma arc is powered off, and the metal cylinder 8 keeps rotating until the temperature drops to an operable temperature, then stops rotating, disassembles the metal cylinder 8, and takes out the hollow quartz cylinder inside;

[0077] 6. The quartz tube is trimmed to meet the requirements. The size of the quartz tube is 430mm in outer diameter, 350mm in inner diameter and 2300mm in length. After inspection, the inner and outer diameters of the quartz tube are uniform, and there are no impurities and few bubbles inside.

[0078] Comparative Example 1: Using the existing general process (the metal cylinder 8 does not rotate, the delivery tube of the feeding gun 14 is not replaced, and the existing general process parameters are used)

[0079] 1. Install the metal cylinder 8 with an inner diameter of 500mm and a length of 2500mm at both ends. The metal cylinder 8 does not rotate;

[0080] 2. Use the feeding system to make the feeding gun 14 stay at the outlet of the electrode 10, and feed 400 kg of high-purity quartz sand into the metal cylinder 8;

[0081] 3. Start the transmission mechanism to make the metal cylinder 8 rotate at high speed, with a rotation speed of 600 rad / min;

[0082] 4. Use the high temperature of the plasma arc of the heating mechanism to gradually melt the quartz sand layer;

[0083] 5. The plasma arc is powered off, and the metal cylinder 8 keeps rotating until the temperature drops to an operable temperature, then stops rotating, disassembles the metal cylinder 8, and takes out the hollow quartz cylinder inside;

[0084] 6. After the furnace is dismantled, the outer diameter of the quartz tube is about 450mm and the inner diameter is 380mm, but the inner and outer diameters are not uniform. The wall thickness in the middle of the quartz tube is 40mm and the wall thickness at both ends is 25mm. The wall thickness difference is large, and there are many impurities such as black spots and bubbles inside.

[0085] It can be seen from the above two embodiments and comparative examples that the quartz tube product obtained by adopting the technical solution of the present invention is of high quality.

[0086] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0087] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hollow quartz tube manufacturing device, characterized in that: include: Frame, metal cylinder, transmission mechanism, heating mechanism and feeding system; The metal cylinder is arranged horizontally, and the bottom is supported above the frame by a support member; The transmission mechanism is installed on the frame; the driving end of the transmission mechanism is connected to the center of one end of the metal cylinder to drive the metal cylinder to rotate; The heating systems are respectively arranged at both ends of the metal cylinder to heat the metal cylinder; The feeding system includes a feeding gun, a feeding valve, and an inner layer material feeding assembly and an outer layer material feeding assembly respectively connected to the feeding valve; the feeding gun is arranged on a frame, and is connected to a horizontal driving mechanism. Driven by the horizontal driving mechanism, the feeding gun reciprocates along the axial direction of the metal cylinder, so that the inner end of the feeding gun extends into the metal cylinder to feed the material; the outer end of the feeding gun is connected to a compressed air pipeline, and the outer end of the feeding gun is also connected to the outlet of the feeding valve through a pipeline. The feeding valve is provided with two outlets, one of which is connected to the inner layer material feeding assembly, and the other is connected to the outer layer material feeding assembly.

2. The hollow quartz tube manufacturing device according to claim 1, characterized in that: The transmission mechanism includes a transmission motor, a transmission box, a flange and a rotary sealing support; the motor shaft of the transmission motor is connected to the input end of the transmission box, the output end of the transmission box is connected to one end face of the flange, and the other end face of the flange is fixed to the end of the metal cylinder; a rotary sealing support is arranged on the inner side of the transmission box.

3. The hollow quartz tube manufacturing device according to claim 1 or 2, characterized in that: The heating mechanism comprises two electrodes respectively fixed at two ends of the metal cylinder and a power source connected to the electrodes; the electrodes are hollow inside and arranged horizontally, and the feeding gun passes through the electrodes; a jacket is arranged outside the electrodes, and cooling water flows through the jacket.

4. The hollow quartz tube manufacturing device according to claim 3, characterized in that: The inner layer material feeding assembly and the outer layer material feeding assembly are structurally connected, and each includes a filling hopper, a feeding pipe and a filling valve. The bottom outlet of the filling hopper is connected to the upper end of the feeding pipe, and the feeding pipe is provided with a filling valve; the lower ends of the feeding pipes of the inner layer material feeding assembly and the outer layer material feeding assembly are respectively connected to the feeding valves.

5. The hollow quartz tube manufacturing device according to claim 4, characterized in that: The frame has two groups, namely the first frame and the second frame; the frame includes a body and a base, and the body is welded to the body; the transmission mechanism is arranged on the body of the first frame; the metal cylinder is arranged on the body of the first frame through a support; the horizontal driving mechanism of the feeding gun is installed on the body of the second frame.

6. A method for manufacturing a hollow quartz cylinder according to any one of claims 1 to 5, characterized in that: The process includes the following steps: Step 1: Rotate the metal cylinder; Step 2: Feed the outer layer material into the metal cylinder: the feeding valve is switched to connect the feeding pipe of the outer layer material feeding assembly with the feeding gun, and the feeding end of the feeding gun reciprocates axially in the metal cylinder to feed the outer insulation layer particles into the metal cylinder, so that the outer insulation layer particles are evenly attached to the inner wall of the metal cylinder under the action of centrifugal force; Step 3: Feed the inner layer of quartz sand into the metal cylinder: replace the feeding pipe of the feeding gun, and then switch the feeding valve to connect the feeding pipe of the inner layer material feeding assembly with the feeding gun, so that the feeding end of the feeding gun moves axially back and forth in the metal cylinder, and the quartz sand is fed into the metal cylinder. The quartz sand is evenly distributed axially in the outer insulation layer particles; Step 4: Heat up and melt to complete the melting of the quartz sand layer of the inner layer material; Step 6: Cool down and trim the quartz tube.

7. The hollow quartz tube manufacturing process according to claim 6, characterized in that: The rotation speed of the metal cylinder is 400-1500 rad / min.

8. The method for manufacturing a hollow quartz cylinder according to claim 6, characterized in that: The particle size of the outer layer material is 1-5 mm; the filling speed of the outer layer material is 20-50 kg / min; the moving speed of the feeding gun is 1000 mm / min.

9. The method for manufacturing a hollow quartz cylinder according to claim 6, characterized in that: The filling speed of the inner layer material is 5-30kg / min; the moving speed of the feeding gun is 1000mm / min.

10. The method for manufacturing a hollow quartz cylinder according to claim 6, characterized in that: The particle size of the outer layer material is 1-5mm, the particle size of the inner layer material is 60-300um, and the product of the particle size of the outer layer material and the inner layer material is 0.3mm 2 .

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