A pipe drawing device for quartz tube production

Abstract

The utility model discloses a pull pipe device for quartz tube production belongs to quartz tube production technical field, and it is including: smelt material equipment, smelt material equipment is used for melting raw material, temperature adjusting equipment, temperature adjusting equipment is used for adjusting the temperature of melting raw material, forming guide equipment, forming guide equipment is used for guiding the shaping of raw material after melting, cooling assembly, cooling assembly is used for the cooling of the quartz tube after forming, wherein, cooling assembly includes water cooling part and air cooling part, and water cooling part is located close to one end of forming guide equipment. The utility model discloses a water cooling part and air cooling part are combined, and high temperature quartz tube first passes through water cooling fast setting, then passes through air cooling and cools down, can avoid the problem that quartz tube cooling is not thorough due to the length of water cooling channel is too long, forms the obvious axial cooling gradient, and water cooling channel is too short.

Description

Technical Field

[0001] This utility model relates to the field of quartz tube production technology, specifically to a tube drawing device for quartz tube production. Background Technology

[0002] In the quartz tube drawing process, the high-temperature tube formed after the molten raw material is guided by the forming process needs to be cooled efficiently to achieve shape fixation and stress release. The rationality of the cooling process directly determines the diameter accuracy, straightness and cracking rate of the quartz tube. In the existing technology, most quartz tube drawing devices use air cooling or water cooling.

[0003] In the existing technology, the air nozzles of the air-cooled components are mostly fixed and can only blow air at a specific angle of the tube body. There is a significant cooling blind zone (such as the angle area between adjacent air nozzles), which causes a significant temperature difference in the circumferential direction of the tube body. Ultimately, this affects the quality of the formed quartz tube. Moreover, if only air cooling is used, the cooling efficiency of the high-temperature tube body is insufficient due to the low specific heat capacity of air. During this period, the high-temperature tube body that has not yet been shaped is prone to bending and deformation due to its own weight or traction tension, which affects the quality of the tube body. In existing technologies, water-cooling channels are mostly straight-tube axially distributed. These channels are opened axially along the side wall of the bushing. The coolant has a short flow path in the channel and is unevenly distributed circumferentially. The tube body in the overheated area is prone to expansion due to softening, while the tube body in the undercooled area is prone to contraction, resulting in a reduction in tube diameter. Ultimately, this affects the quality of the formed quartz tube. In addition, spiral water-cooling channels are also used. However, if the length of the spiral water-cooling channel is too long, it will cause an excessive temperature difference between the inlet and outlet sections of the coolant, forming a significant axial cooling gradient and affecting the cooling efficiency. If the water-cooling channel is too short, it will result in incomplete cooling of the quartz tube.

[0004] To solve the above problems, this utility model provides a tube drawing device for quartz tube production. Utility Model Content

[0005] To address the aforementioned technical shortcomings, the purpose of this utility model is to provide a tube drawing device for quartz tube production. By combining a water-cooling section and an air-cooling section, the high-temperature quartz tube is first rapidly shaped by water cooling and then cooled by air cooling. This avoids the problems of a significant axial cooling gradient due to an excessively long water-cooling channel and incomplete cooling of the quartz tube due to an excessively short water-cooling channel.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a tube drawing device for quartz tube production, comprising: A melting device, wherein the melting device is used to melt raw materials; A temperature regulating device, wherein the temperature regulating device is used to regulate the temperature of the molten raw material; A molding and guiding device, used to guide and shape molten raw materials; A cooling assembly for cooling the formed quartz tube; The cooling assembly includes a water-cooled section and an air-cooled section, with the water-cooled section located at one end near the molding guide device.

[0007] Preferably, the water-cooling section includes: The bushing is located at one end of the outlet of the forming guide equipment, and the inner side wall of the bushing is provided with a space for coolant to flow. The two ends of the bushing are respectively fixedly installed with an inlet pipe and an outlet pipe.

[0008] Preferably, the bushing has multiple flow grooves inside its sidewall, and the multiple flow grooves are distributed along the circumference of the bushing, with the two ends of the multiple flow grooves respectively connected to the inlet pipe and the outlet pipe.

[0009] Preferably, the flow channel is spiral in shape.

[0010] Preferably, the bushing has a connecting cavity at both ends, and the two connecting cavities are respectively connected to the ends of multiple flow channels, and the water inlet pipe and the water outlet pipe are respectively connected to the two connecting cavities.

[0011] Preferably, the water inlet pipe is located at the end of the bushing away from the molding guide device, and the water outlet pipe is located at the end of the bushing closer to the molding guide device.

[0012] Preferably, the air-cooling section includes: A frame, located at the end of the bushing away from the forming guide device, and rotatably connected to the bushing; The frame has air nozzles at both ends that are inclined toward the center of the frame, and the frame is connected to an external air pump. When the air pump is started, the frame rotates synchronously, forming a spiral wind field on the surface of the quartz tube.

[0013] Preferably, the frame comprises: Two base rings are connected to each other by multiple connecting rods. The base rings are hollow structures, and the multiple connecting rods are also hollow structures. Each base ring is connected to an external air pump through an air inlet pipe.

[0014] Preferably, the connecting rod has multiple inclined air outlets on the side facing the base ring, and the air outlets are also inclined towards the middle position of the corresponding connecting rod.

[0015] Preferably, the intake pipe is fixedly mounted on the sleeve frame, and the sleeve frame is rotatably sleeved on the corresponding base ring and communicates with the interior of the corresponding base ring.

[0016] The beneficial effects of this utility model are as follows: This invention, through the design of a water-cooling section and an air-cooling section, enables high-temperature quartz tubes to be rapidly shaped by water cooling and then cooled by air cooling. This avoids insufficient cooling efficiency of the air cooling system, which could lead to bending and deformation of the unshaped high-temperature tube. It also avoids the problems of excessively long water cooling channels causing significant axial cooling gradients, and excessively short water cooling channels leading to incomplete cooling of the quartz tube.

[0017] This invention, through the installation of a bushing, enables rapid cooling and shape fixation of the high-temperature quartz tube during its initial molding process using water cooling, preventing deformation due to the tube's own weight or traction force. Simultaneously, the inlet pipe is located away from the molding end of the bushing, while the outlet pipe is close to the molding end, creating a counter-current flow of coolant in the opposite direction to the tube's movement. This allows the low-temperature coolant to first contact the middle and rear sections of the tube (relatively lower temperature) before flowing to the high-temperature section (highest temperature) just outside the molding opening. This gradual heat absorption from low to high temperature avoids the direct impact of low-temperature coolant on the high-temperature section, which can cause localized rapid cooling and lead to quality problems in the quartz tube, as is common in traditional co-current flow systems.

[0018] This invention, through the arrangement of base rings and connecting rods, achieves the fixed installation of air nozzles inclined towards the center of the frame on one side of the two base rings facing each other, and the air outlet on the connecting rod is inclined towards the middle of the connecting rod. Furthermore, the base rings are rotated and installed, which can form a spiral wind field during the air cooling process, so that the airflow can evenly sweep across the entire circumference of the tube, eliminate cooling blind spots, and uniform air cooling can avoid excessive local shrinkage of the tube, reduce internal stress concentration, and reduce the risk of cracking. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a tube drawing device for quartz tube production provided in an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the bushing of this utility model.

[0022] Figure 3 This is a schematic diagram showing the connection between the bushing and the water inlet pipe of this utility model.

[0023] Figure 4 This is a cross-sectional view of the bushing of this utility model.

[0024] Figure 5 This is a schematic diagram of the structure of the base ring and connecting rod of this utility model.

[0025] Figure 6 This is a cross-sectional view of the base ring and connecting rod of this utility model.

[0026] Figure 7 This utility model Figure 6 Enlarged view of point A.

[0027] Figure 8 This is a partial sectional view of the connecting rod of this utility model.

[0028] Explanation of reference numerals in the attached figures: 1. Melting equipment; 2. Temperature control equipment; 3. Molding guide equipment; 4. Bushing; 5. Water inlet pipe; 6. Water outlet pipe; 7. Flow channel; 8. Connecting cavity; 9. Base ring; 10. Connecting rod; 11. Air inlet pipe; 12. Sleeve frame; 13. Motor. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] This utility model provides a tube drawing device for quartz tube production, such as... Figures 1 to 8 As shown.

[0031] Example 1: A tube drawing device for quartz tube production includes a melting device 1, a temperature regulating device 2, a forming guide device 3, and a cooling assembly. The melting device 1 is a high-frequency induction heating furnace, which can heat quartz sand raw material to a molten state of 1700-1800℃. The temperature regulating device 2 is an embedded temperature control module that monitors the temperature of the molten raw material in real time via thermocouples, stabilizing the temperature at 1750℃±20℃ to ensure that the raw material is in a easily shaped and non-carbonized state. The forming guide device 3 is a conical ceramic mold with a through hole in the center that matches the inner diameter of the quartz tube. The molten raw material is injected from the top of the mold and, under the action of a traction device (not shown), flows downward along the through hole and initially forms a tubular structure. The structure and working principle of the melting device 1, temperature regulating device 2, forming guide device 3, and traction device in the above process are all existing technologies and are not the technical features of this utility model. Therefore, this utility model will not elaborate on them.

[0032] The cooling assembly includes a water-cooled section and an air-cooled section, with the water-cooled section located at the end near the outlet of the forming guide device 3. The core component is the bushing 4, which is a cylindrical graphite bushing (high temperature resistant and with good thermal conductivity). Its inner wall is fitted to the outer wall of the initially formed quartz tube, allowing it to quickly remove heat from the quartz tube through heat conduction. Multiple flow grooves 7 are evenly distributed circumferentially along the inner sidewall of the bushing 4. The flow grooves 7 are spiral-shaped, which both extends the flow path of the coolant and ensures that the coolant is evenly distributed circumferentially along the bushing 4, avoiding uneven cooling in certain areas.

[0033] Both ends of the bushing 4 have annular connecting cavities 8. The two connecting cavities 8 and multiple flow channels 7 form a water cooling channel. The connecting cavity 8 closer to the forming guide device 3 is welded to the water outlet pipe 6, and the connecting cavity 8 farther from the forming guide device 3 is welded to the water inlet pipe 5. The water inlet pipe 5 and the water outlet pipe 6 are connected to external circulating cooling equipment (such as an industrial chiller). The two ends of the multiple flow channels 7 are respectively connected to the two connecting cavities 8. During operation, the external cooling water pump delivers coolant to the bushing 4 through the water inlet pipe 5. The coolant first enters the connecting cavity 8 farther from the forming guide device 3 and is evenly distributed to the interior of the multiple spiral flow channels 7. It flows along the spiral flow channels 7 and continuously absorbs the heat from the quartz tube transferred by the bushing 4. Finally, it is discharged from the water outlet pipe 6 through the upper connecting cavity 8.

[0034] This flow design, which is opposite to the direction of movement of the quartz tube, allows the low-temperature coolant to first contact the middle and rear sections of the quartz tube before flowing to the high-temperature section just outside the forming port. This avoids the localized sudden cooling caused by the direct impact of the low-temperature coolant on the high-temperature section in traditional co-current flow, and prevents the quartz tube from cracking due to thermal stress. At the same time, the spiral flow grooves 7 are evenly distributed around the circumference, and together with the flow-dividing effect of the connecting cavity 8, ensure that the temperature of the bushing 4 is consistent throughout the circumference, and that the quartz tube cools down evenly in the circumferential direction, avoiding deviations in tube diameter due to local shrinkage differences.

[0035] Example 2: Based on Embodiment 1, this embodiment adds an air-cooled section at the end of the water-cooled section away from the forming guide device 3. The core of the air-cooled section is a frame, which includes two base rings 9 and multiple connecting rods 10.

[0036] The air-cooled section allows for continued cooling of the quartz tube while shortening the length of the water-cooling channel. This solves the problems of a significant axial cooling gradient forming when the water-cooling channel is too long, and incomplete cooling of the quartz tube when the water-cooling channel is too short.

[0037] The base ring 9 is a hollow stainless steel ring. Two base rings 9 are connected to each other by multiple connecting rods 10. The multiple connecting rods 10 are evenly distributed around the base ring 9. The connecting rods 10 are hollow and their interiors are connected to the interiors of the base ring 9, forming a continuous airflow channel.

[0038] Multiple air nozzles are evenly welded to one side of the base ring 9 facing the center of the frame. Multiple air outlets are opened on one side of the connecting rod 10 facing the axis of the base ring 9. A sleeve frame 12 is fitted on the outer side of any base ring 9. The sleeve frame 12 communicates with the interior of the base ring 9. The sleeve frame 12 is a hollow stainless steel sleeve. A sealed bearing is installed between its inner wall and the outer wall of the base ring 9 to ensure that the base ring 9 can rotate freely and to prevent air leakage.

[0039] An air inlet pipe 11 is welded to the side wall of the sleeve 12. The end of the air inlet pipe 11 away from the sleeve 12 is connected to an external high-pressure air pump. The airflow can enter the interior of the two base rings 9 and the connecting rod 10 through the air inlet pipe 11 and the sleeve 12, and then be ejected from the air nozzle and the air outlet, so as to continue to cool the quartz tube that has passed through the water-cooled section.

[0040] Example 3: Based on Embodiment 2, in order to improve the cooling uniformity of the air-cooled section, the frame is designed to be rotatable. The base ring 9 near the bushing 4 is rotatably connected to the bushing 4, and a support part is provided below the base ring 9 away from the bushing 4. Multiple teeth are fixedly connected to the base ring 9 near the bushing 4. The base ring 9 is connected to the gear through the teeth provided on it. The gear is fixedly installed on the motor 13, and the motor 13 is installed on the bushing 4. When cooling is performed, the motor 13 starts and drives the base ring 9 to rotate, forming a spiral airflow in the circumferential direction of the quartz tube. The air outlet of the connecting rod 10 will increase the airflow intensity in the axial direction of the quartz tube, forming a spiral wind field covering the entire circumference and axial direction of the quartz tube. This wind field design completely eliminates the cooling blind zone of the traditional fixed air nozzle. The airflow spirals forward along the surface of the quartz tube, and each area can be swept by the airflow, so as to cool the quartz tube steadily.

[0041] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A tube drawing device for quartz tube production, characterized in that, include: Melting equipment (1), said melting equipment (1) is used to melt raw materials; Temperature regulating device (2), the temperature regulating device (2) is used to regulate the temperature of the molten raw material; A molding guide device (3) is used to guide and shape the molten raw material; A cooling assembly for cooling the formed quartz tube; The cooling assembly includes a water-cooled section and an air-cooled section, with the water-cooled section located at one end near the forming guide device (3).

2. The tube drawing device for quartz tube production as described in claim 1, characterized in that, The water-cooling section includes: The bushing (4) is located at one end of the outlet of the forming guide device (3), and the side wall of the bushing (4) is provided with a space for coolant to flow. The two ends of the bushing (4) are respectively fixedly installed with an inlet pipe (5) and an outlet pipe (6).

3. The tube drawing device for quartz tube production as described in claim 2, characterized in that, The bushing (4) has multiple flow grooves (7) inside its side wall, and the multiple flow grooves (7) are distributed along the circumference of the bushing (4). The two ends of the multiple flow grooves (7) are respectively connected to the water inlet pipe (5) and the water outlet pipe (6).

4. The tube drawing device for quartz tube production as described in claim 3, characterized in that, The flow channel (7) is spiral in shape.

5. The tube drawing device for quartz tube production as described in claim 3, characterized in that, The bushing (4) has a connecting cavity (8) inside both ends, and the two connecting cavities (8) are respectively connected to the ends of multiple flow channels (7). The water inlet pipe (5) and the water outlet pipe (6) are respectively connected to the two connecting cavities (8).

6. The tube drawing device for quartz tube production as described in claim 2, characterized in that, The inlet pipe (5) is located at the end of the bushing (4) away from the molding guide device (3), and the outlet pipe (6) is located at the end of the bushing (4) close to the molding guide device (3).

7. The tube drawing device for quartz tube production as described in claim 1, characterized in that, The air-cooled section includes: The frame is located at the end of the bushing (4) away from the forming guide device (3) and is rotatably connected to the bushing (4); The frame has air nozzles at both ends that are inclined toward the center of the frame, and the frame is connected to an external air pump. When the air pump is started, the frame rotates synchronously, forming a spiral wind field on the surface of the quartz tube.

8. The tube drawing device for quartz tube production as described in claim 7, characterized in that, The framework includes: Two base rings (9) are connected to each other by multiple connecting rods (10). The base rings (9) are hollow structures, and the multiple connecting rods (10) are also hollow structures. Any base ring (9) is connected to an external air pump through an air inlet pipe (11).

9. A tube drawing device for quartz tube production as described in claim 8, characterized in that, The connecting rod (10) has multiple inclined air outlets on the side facing the base ring (9), and the air outlets are also inclined towards the middle position of the corresponding connecting rod (10).

10. A tube drawing device for quartz tube production as described in claim 8, characterized in that, The air intake pipe (11) is fixedly installed on the sleeve frame (12), and the sleeve frame (12) is rotatably sleeved on the corresponding base ring (9) and communicates with the interior of the corresponding base ring (9).

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