Matrix type temperature control furnace for parallel heating and wire drawing of glass rods

Abstract

The invention relates to the technical field of glass hot working equipment, in particular to a matrix type temperature control furnace for parallel heating and wire drawing of glass bars, which comprises a core heating temperature equalizing module, a three-dimensional staggered heating assembly, an end face protection enhancing module, a closed-loop temperature control system and a furnace body fixing and supporting module. The core heating temperature-equalizing module is an aluminum oxide or silicon carbide integrally-formed high-temperature refractory brick, a temperature-equalizing cavity and a bar channel are arranged in the core heating temperature-equalizing module, and the wall of the cavity is coated with a zirconium oxide coating. The three-dimensional staggered heating assembly comprises silicon carbide rods which are embedded through staggered mounting holes in four sides and are connected in parallel; the end face protection reinforcing module is a double-layer stainless steel plate, and a ceramic fiber heat insulation pad is clamped. The closed-loop temperature control system comprises a K-type thermocouple, a temperature itinerant detector and a temperature controller and is in linkage with a silicon controlled rectifier power adjusting power source, and the furnace body fixing and supporting module comprises a side wall protection plate and threaded lifting supporting legs. According to the technical scheme, the thermal field is uniform, temperature control is accurate, the structure is stable, multi-rod parallel wire drawing is adapted, and the production efficiency and the product uniformity are improved.

Description

Technical Field

[0001] This invention relates to the field of glass thermal processing equipment technology, specifically a matrix temperature control furnace for parallel heating and drawing of glass rods. Background Technology

[0002] In the fields of optical glass, specialty optical fibers, and precision instrument manufacturing, the glass rod drawing process demands extremely high levels of heating uniformity, temperature stability, and production efficiency. Traditional drawing furnaces often employ single-channel or a few parallel-channel designs, making it difficult to meet the demands of high-volume, high-consistency production. Existing equipment generally suffers from uneven heat distribution, delayed temperature control response, and insufficient structural strength.

[0003] Conventional resistance furnaces typically place heating elements on the top and bottom or one side of the furnace chamber, resulting in asymmetrical heating of the glass rods. This can easily lead to uneven softening, diameter fluctuations, or even breakage. Furthermore, refractory materials are often pieced together, and differences in thermal expansion can easily cause cracking, affecting the furnace's lifespan and sealing performance. In addition, most temperature control systems rely on single-point temperature measurement, which cannot accurately reflect the temperature field distribution within the chamber, making high-precision control difficult. Temperature differences often exceed ±5℃, severely impacting the quality of the glass drawing process.

[0004] Although some equipment attempts have been made to increase the number of channels, the heat source layout has not been optimized, resulting in cold zones caused by mutual obstruction between multiple bars; the end faces lack effective protection, and the channel openings are prone to deformation at high temperatures, leading to glass rod jamming or surface scratches. At the same time, the support structure lacks rigidity and is prone to displacement under long-term thermal cycling, affecting alignment accuracy. Summary of the Invention

[0005] Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a matrix-type temperature-controlled furnace for parallel heating and drawing of glass rods.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: A matrix-type temperature-controlled furnace for parallel heating and drawing of glass rods, comprising a core heating and temperature-equalizing module, a three-dimensional staggered heating assembly, an end-face protection and reinforcement module, a closed-loop temperature control system, and a furnace body fixing and support module. The core heating and temperature-equalizing module is an integrally formed structure. The three-dimensional staggered heating assembly is embedded in the side of the core heating and temperature-equalizing module. The end-face protection and reinforcement module covers both ends of the core heating and temperature-equalizing module. The closed-loop temperature control system is electrically connected to the three-dimensional staggered heating assembly. The furnace body... The fixed support module is assembled at the bottom of the end face protection and reinforcement module and on the side of the core heating and temperature equalization module. The core heating and temperature equalization module includes an integrally formed high-temperature refractory brick. The three-dimensional staggered heating assembly includes several rod-shaped electric heating elements and several mounting holes. The rod-shaped electric heating elements are silicon carbide rods. The end face protection and reinforcement module includes an inner liner and an outer reinforcing plate. The closed-loop temperature control system includes several K-type thermocouples, a temperature monitoring instrument, a temperature controller, and a silicon controlled rectifier power supply. The furnace body fixed support module includes a side protection plate and at least four bottom support feet.

[0007] Preferably, the high-temperature refractory brick has a cuboid structure and is made of alumina or silicon carbide; the interior of the high-temperature refractory brick is hollowed out to form a cuboid uniform temperature cavity with uniform wall thickness in all directions; at least 25 circular bar material channels are opened through the top and bottom surfaces of the high-temperature refractory brick and arranged in a 5×5 matrix, with the bar material channels on the top and bottom surfaces precisely aligned and the center distance between all adjacent bar material channels being equal.

[0008] More preferably, the inner wall of the temperature equalization chamber is coated with a high-temperature anti-oxidation coating, and the high-temperature anti-oxidation coating material is zirconium oxide; the diameter of the bar material channel is Φ8mm, and the center distance between adjacent bar material channels is 60mm.

[0009] Preferably, the three-dimensional staggered heating assembly includes at least twelve rod-shaped heating elements and twenty-four mounting holes. The mounting holes are opened on the four side walls of the high-temperature refractory brick. Six first mounting holes are opened at the vertical center position of the first opposite side wall of the high-temperature refractory brick, and six second mounting holes are opened at a height of 120mm from the bottom surface of the second opposite side wall of the high-temperature refractory brick. The first and second mounting holes are spatially staggered, and their horizontal projections are aligned with the gap between the bar material channels.

[0010] Preferably, the rod-shaped heating element is fixed in the first mounting hole and the second mounting hole by high-temperature refractory mortar, and its electrode lead-out end is fitted with a high-temperature insulating sleeve made of corundum material; and all rod-shaped heating elements are connected in parallel by aluminum foil connecting strips.

[0011] In a further preferred embodiment, the inner lining plate is in close contact with the top and bottom surfaces of the high-temperature refractory brick, and a ceramic fiber heat insulation pad is laid between the inner lining plate and the high-temperature refractory brick; the outer reinforcing plate is fastened to the inner lining plate and the high-temperature refractory brick by high-temperature bolts made of alloy material; both the inner lining plate and the outer reinforcing plate are provided with 25 through holes, the edges of the through holes are chamfered, and the through holes are adapted to the bar material channel.

[0012] Preferably, one of the K-type thermocouples is installed at the center of the outer reinforcing plate on top of the high-temperature refractory brick, and the other four K-type thermocouples are respectively installed on the outer reinforcing plates at the four corners of the temperature equalization cavity. The probes of the K-type thermocouples all extend into the temperature equalization cavity to a depth of 50mm. The temperature monitoring instrument is electrically connected to the K-type thermocouples, and the temperature controller is electrically connected to the temperature monitoring instrument and the thyristor power supply in sequence. The temperature controller is also electrically connected to the rod-shaped heating element.

[0013] Preferably, the side protective plate is arranged around the core heating and temperature equalization module, and a heat dissipation gap of at least 8cm is reserved between the side protective plate and the electrode lead-out end of the rod-shaped heating element; the bottom support foot adopts a threaded lifting installation structure, and the bottom of the bottom support foot is provided with an anti-slip rubber pad.

[0014] More preferably, the temperature controller has a built-in PID adjustment algorithm to maintain the temperature inside the equalization chamber within a set value ±2℃.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a matrix temperature control furnace for parallel heating and drawing of glass rods, which has the following beneficial effects: The core heating and temperature equalization module of this technical solution adopts an integrally molded high-temperature refractory brick, forming a cuboid temperature equalization cavity inside. The top and bottom surfaces are equipped with 25 Φ8mm rod channels arranged in a 5×5 matrix. The channels have high alignment accuracy and consistent spacing, ensuring that multiple glass rods are heated simultaneously, realizing efficient parallel wire drawing and greatly improving production efficiency.

[0016] The three-dimensional staggered heating assembly has 12 silicon carbide heating elements staggered on the four side walls of the furnace body. Their horizontal projection is aligned with the gap between the rods to avoid direct radiation causing local overheating. Combined with the zirconium oxide anti-oxidation coating on the inner wall of the uniform temperature chamber, it effectively improves the uniformity of the heat field and the life of the elements.

[0017] The closed-loop temperature control system is equipped with 5 K-type thermocouples to monitor the temperature distribution inside the cavity in real time. Through the linkage of temperature monitoring instrument, temperature controller and thyristor power supply, combined with PID algorithm, the temperature difference is controlled within ±2℃ to ensure the uniform softening of glass rod and reduce wire breakage and diameter fluctuation.

[0018] The end-face protection enhancement module adopts a three-layer structure of inner lining plate, ceramic fiber heat insulation pad, and outer reinforcement plate, with through-hole chamfer design to avoid scratching the glass rod; the furnace body fixing support module is equipped with adjustable threaded support feet and anti-slip rubber pads to ensure the equipment is stable and adaptable to different installation environments.

[0019] The machine features a compact structure, high thermal efficiency, and convenient maintenance. It is particularly suitable for batch drawing processes of high-precision glass rods such as optical glass and special optical fibers, significantly improving product quality and production capacity. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall device structure of the present invention; Figure 2 This is a schematic diagram of the structure of the core heating and temperature equalization module mounting end face protection enhancement module of the present invention; Figure 3 This is a top view of the core heating and temperature equalization module of the present invention. Figure 4 This is a bottom view of the core heating and temperature equalization module of the present invention; Figure 5 This is a schematic diagram of the connection structure between the temperature controller and various electrical components of the present invention; In the diagram: 1. High-temperature refractory brick; 2. Bar material channel; 3. Inner lining plate; 4. Outer reinforcing plate; 5. Ceramic fiber heat insulation pad; 6. Through hole; 7. First mounting hole; 8. Second mounting hole; 9. Rod-shaped heating element; 10. Heat dissipation gap; 11. K-type thermocouple; 12. Bottom support foot; 13. Side protective plate. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-5This invention discloses a matrix-type temperature control furnace for parallel heating and drawing of glass rods, comprising a core heating and temperature equalization module, a three-dimensional staggered heating assembly, an end-face protection and reinforcement module, a closed-loop temperature control system, and a furnace body fixing and support module. The core heating and temperature equalization module is an integrally formed structure. The three-dimensional staggered heating assembly is embedded in the side of the core heating and temperature equalization module. The end-face protection and reinforcement module covers both ends of the core heating and temperature equalization module. The closed-loop temperature control system is electrically connected to the three-dimensional staggered heating assembly. The furnace body fixing and support module is assembled on the end-face protection and reinforcement module. The module bottom and the side of the core heating and temperature equalization module, the core heating and temperature equalization module includes an integrally formed high-temperature refractory brick 1, the three-dimensional staggered heating assembly includes several rod-shaped electric heating elements 9 and several mounting holes, the rod-shaped electric heating elements 9 are silicon carbide rods, the end face protection and reinforcement module includes an inner lining plate 3 and an outer reinforcing plate 4, the closed-loop temperature control system includes several K-type thermocouples 11, a temperature monitoring instrument, a temperature controller and a thyristor power supply, and the furnace body fixing support module includes a side protective plate 13 and at least four bottom support feet 12.

[0023] The working principle of this technical solution is overall uniform temperature conduction, three-dimensional staggered heating, closed-loop precise temperature control, and multi-dimensional stable protection: A uniform thermal field carrier is constructed based on integrally formed high-temperature refractory bricks 1. Multi-channel synchronous heating is achieved through a three-dimensional staggered layout of silicon carbide rods. Temperature is dynamically controlled using multi-point temperature measurement and a PID algorithm, coupled with double-layer end-face protection and a stable support structure, ensuring that the 25 glass rods soften synchronously in a consistent thermal environment, meeting the stringent requirements of temperature uniformity and stability for parallel filament drawing. The entire technical solution is based on mature materials science and temperature control technology, with clear collaborative logic among modules and strong feasibility.

[0024] By using an integrally formed high-temperature refractory brick 1 and an internal uniform temperature cavity design, uniform heat conduction and heat storage are achieved, providing a consistent heating environment for multiple bars and solving the temperature gradient problem of traditional multi-bar heating.

[0025] High-temperature refractory brick 1 is made of alumina or silicon carbide, both of which are commonly used high-temperature resistant materials in the field of heat processing equipment. They possess excellent thermal stability, a long-term operating temperature ≥1200℃, uniform thermal conductivity, and high mechanical strength, avoiding the risk of cracking caused by differences in the coefficients of thermal expansion between spliced ​​bricks. The cuboid structure design, combined with a uniform wall thickness in all directions (e.g., 80mm), ensures that heat is conducted from the sidewalls of the brick to the uniform temperature cavity without local deviations, laying the foundation for a uniform thermal field.

[0026] Alumina refractory bricks, such as T-3 refractory bricks and silicon carbide refractory bricks, are industrial standard parts with wide market channels. They can be integrally formed by CNC milling machines, and the dimensional accuracy is easy to control, which can be achieved by ordinary machine shops.

[0027] The high-temperature refractory brick 1 has a hollowed-out interior forming a cuboid temperature uniform cavity, which serves as a heat buffer and diffusion space, allowing the heat generated by the silicon carbide rod to form a dynamic balance within the cavity and avoiding local overheating. The 25 circular rod channels 2 are arranged in a 5×5 matrix, running through the top and bottom surfaces. They are precisely aligned, and the center distance between adjacent channels is 60mm. This layout ensures that each channel is heated independently, while avoiding thermal interference caused by excessively small channel spacing, ensuring a consistent heat flow distribution around each rod.

[0028] The channel processing adopts a CNC drilling machine, with a hole diameter accuracy of ±0.1mm and a center distance error of ≤0.2mm, which can meet the requirements of precise one-to-one alignment; the 60mm center distance has been verified by thermal field simulation and referenced the design of similar multi-channel heating equipment, which can effectively avoid thermal coupling interference between adjacent channels.

[0029] The inner wall of the uniform temperature chamber is coated with a high-temperature anti-oxidation coating of zirconia material, with a thickness of 0.1-0.3mm. Zirconia has a melting point as high as 2715℃ and has excellent high-temperature corrosion resistance and heat reflection performance. It can prevent the brick from oxidizing and peeling off at high temperatures, reduce heat loss to the interior of the brick, and improve the stability of the thermal field.

[0030] Zirconia coating is achieved using plasma spraying, a mature industrial method for treating high-temperature resistant coatings. The coating thickness can be precisely controlled by the speed of the spray gun movement, and can be completed by ordinary coating processing plants.

[0031] The diameter of the bar material channel 2 is set to Φ8mm, which is suitable for glass bars with a standard diameter of 3mm. A 5mm heat conduction gap is reserved so that the surface of the bar material can uniformly receive the radiant heat and conductive heat from the uniform temperature cavity, avoiding local overheating or poor heat transfer caused by the channel being too narrow.

[0032] The Φ8mm hole diameter is easy to process and can be achieved with ordinary drill bits. It is compatible with mainstream glass rod materials on the market and does not require custom-made special-sized rod materials, making it highly versatile.

[0033] The three-dimensional staggered arrangement of silicon carbide rods allows for surround heating of the temperature equalization cavity from all four sides, ensuring that heat is evenly distributed to each rod channel 2, thus achieving synchronous and equal heating of all 25 channels.

[0034] The 24 mounting holes are arranged in two groups on the four side walls of the high-temperature refractory brick 1. The first group consists of six first mounting holes 7 on each of the opposite side walls, such as the front and back of the high-temperature refractory brick 1, vertically centered. The second group consists of six second mounting holes 8 on each of the opposite side walls, such as the left and right sides of the high-temperature refractory brick 1, 120mm from the bottom surface. The spatially staggered distribution design allows the 12 silicon carbide rods to form a "well"-shaped three-dimensional heat source after insertion. The horizontal projection is precisely aligned with the gaps between the rod channels 2, and the heat radiates from the channel gaps to the center, eliminating heating blind spots.

[0035] The mounting holes are machined using a CNC drilling machine to ensure precise alignment between the silicon carbide rod and the channel gap after installation; the 120mm height difference has been optimized through thermal field simulation to balance the temperature distribution in the upper and lower areas and avoid temperature differences between the upper and lower parts of the equalization cavity.

[0036] The silicon carbide rod is fixed in the mounting hole by high-temperature refractory mortar. The high-temperature refractory mortar, such as clay refractory mortar, is resistant to high temperatures of ≥1500℃. After curing, it can firmly fix the silicon carbide rod and fill the gap between the silicon carbide rod and the mounting hole, thereby improving the thermal conductivity. The electrode lead-out end is fitted with a high-temperature insulating sleeve made of corundum. Corundum is resistant to high temperatures and has excellent insulation properties, which can prevent short circuits between the electrode and the side protective plate 13 and ensure electrical safety.

[0037] Silicon carbide rods are commonly used heating elements in thermal processing equipment. Commercially available silicon carbide rods of the same diameter, high-temperature refractory mortar, and corundum sleeves are all standard consumables that are easy to purchase. During installation, simply insert the silicon carbide rod into the mounting hole, fill it with refractory mortar, and it is ready to use after curing.

[0038] All silicon carbide rods are connected in parallel via aluminum foil connectors. The aluminum foil width is 50mm to ensure stable current transmission and prevent localized heating caused by excessive contact resistance. Parallel connection ensures that the voltage across each silicon carbide rod is consistent, resulting in the same heating power (e.g., 500W per rod), and avoids uneven heating caused by series connection.

[0039] Aluminum foil connecting strips are commonly used conductive connectors in industry, with a high temperature resistance of ≥200℃. They are fixed to the silicon carbide rod electrodes with bolts, ensuring a reliable connection. Parallel circuit design is a conventional method of electrical connection, which can be directly implemented by personnel in the relevant technical field.

[0040] The double-layer stainless steel plate structure achieves heat insulation of the end face of the uniform temperature chamber and mechanical protection of the high-temperature refractory brick 1, while also being compatible with the bar material channel 2, so as not to affect the insertion and wire drawing operations of the bar material.

[0041] The inner lining plate 3 is made of 2mm thick 304 stainless steel plate, closely attached to the end face of the high-temperature refractory brick 1, serving both heat insulation and buffering functions. A 3-5mm thick ceramic fiber heat insulation pad 5 is laid between the inner layer and the brick body. The ceramic fiber has a low thermal conductivity, such as ≤0.12W / (m・K), effectively preventing heat loss from the end face of the equalization cavity and improving thermal efficiency by more than 30%. The outer reinforcing plate 4 is made of 10mm thick 304 stainless steel plate, providing sufficient structural rigidity to prevent damage to the brick end face during transportation or use.

[0042] Both the 304 stainless steel plate and the ceramic fiber heat insulation pad 5 are industrial standard parts, resulting in low procurement costs. The inner lining plate 3 and the heat insulation pad can be fixed with high-temperature adhesive, making the operation simple.

[0043] The outer reinforcing plate 4, inner lining plate 3, and high-temperature refractory brick 1 are fastened together using high-temperature bolts made of alloy material. Inconel alloy has a high temperature resistance of ≥800℃ and can withstand the heat conducted by the uniform temperature cavity without failing due to high temperature, ensuring a firm connection. Eight bolts are evenly distributed on each reinforcing plate, located in the edge area, to avoid obstructing the bar material channel 2.

[0044] Inconel alloy bolts are commonly used fasteners for high-temperature equipment and are commercially available. The bolt mounting holes are machined using a drilling machine, and the thread accuracy meets the standard (6H), allowing ordinary workers to complete the assembly.

[0045] Both the inner liner 3 and the outer reinforcing plate 4 have 25 through holes 6 with a diameter of 9mm each. These holes are 1mm larger than the bar material channel 2 to ensure smooth insertion of the glass bar material. The edges of the through holes 6 are chamfered to prevent the bar material from being scratched by the sharp edges of the holes when it is inserted or pulled out, thus ensuring product quality.

[0046] The through hole 6 is machined using a drilling machine and a chamfering tool. The chamfering accuracy is easy to control and can be achieved by ordinary machining without the need for special equipment.

[0047] Through a closed-loop system of multi-point temperature measurement, data aggregation, algorithm analysis, and power adjustment, the temperature inside the equalization chamber is monitored in real time, and the heating power of the silicon carbide rod is dynamically adjusted to ensure that the temperature remains stable within the set value ±2℃.

[0048] Five K-type thermocouples 11 are respectively arranged in the center of the temperature equalization cavity, the center of the top reinforcing plate, and the four corners, corresponding to the positions of the reinforcing plate. The probes extend 50mm into the temperature equalization cavity, which can comprehensively collect temperature data of the central and edge areas of the cavity, avoiding temperature misjudgment caused by single-point temperature measurement. The K-type thermocouples 11 have a wide temperature measurement range, such as -200℃ to 1300℃, which is suitable for the operating temperature range of 800-900℃ of the temperature equalization cavity.

[0049] Type K thermocouple 11 is a commonly used temperature measuring element in industry, widely available in the market. During installation, it is fixed to the reserved mounting hole of the reinforcing plate with bolts, and the probe insertion depth can be adjusted by the nut, making it easy to operate.

[0050] Temperature monitoring devices, such as the AI-7048 model, are electrically connected to five thermocouples to aggregate and convert scattered temperature signals into standard 4-20mA electrical signals, which are then transmitted to the temperature controller. The temperature controller has a built-in PID control algorithm that can quickly respond to temperature deviations. Through proportional (P), integral (I), and derivative (D) calculations, it outputs precise control signals to avoid excessive temperature fluctuations.

[0051] The temperature monitoring instrument and temperature controller are both commercially available standard temperature control devices, supporting multi-channel input and PID adjustment, requiring no custom development; parameter settings can be completed through the device panel or host computer, which can be quickly mastered by personnel in the relevant technical field.

[0052] The temperature controller is connected to a SCR-regulated power supply, such as the KSG-100A model, and is electrically connected to the silicon carbide heating element. When the temperature is below the set value, the temperature controller outputs a signal to increase the power supply's output power; when the temperature is above the set value, it decreases the output power, forming a closed-loop control. The SCR-regulated power supply enables continuous power adjustment, ensuring temperature stability.

[0053] Thyristor-controlled power supplies are commonly used power regulation devices in industry. They are compatible with resistive loads made of silicon carbide rods and can be wired in a conventional three-phase or single-phase manner. Personnel in the relevant technical field can implement them directly.

[0054] The side protective plate 13 provides physical protection and heat dissipation guidance for the core components, while the bottom support foot 12 ensures the horizontal fixation and installation adaptation of the furnace body, thus ensuring the stability and reliability of the furnace body during the wire drawing process.

[0055] The side protective plate 13 is made of 3mm thick 304 stainless steel plate and is arranged around the core heating and temperature equalization module. It can block external dust and debris from entering the heating area and protect the operator from high temperature burns. A heat dissipation gap 10 of ≥8cm is reserved between the protective plate and the lead-out end of the silicon carbide rod to provide sufficient heat dissipation space for the lead-out end and the power connection line, and avoid component aging or short circuit due to poor heat dissipation.

[0056] The 3mm thick 304 stainless steel plate can be processed into a shape that fits the furnace body by bending machine, and connected to the mounting ear plate on the edge of the outer reinforcement plate 4 by bolts, making assembly simple; the 8cm heat dissipation gap 10 has been verified by heat dissipation simulation and can meet the heat dissipation requirements of the electrode lead-out end.

[0057] Four bottom support feet 12 are installed at the four corners of the bottom outer reinforcement plate 4. They adopt a threaded lifting structure with an adjustment range of ±10mm. The furnace body can be flexibly leveled according to the flatness of the installation site to ensure that the bar material channel 2 is vertical and to prevent the glass bar material from tilting when it is inserted. The bottom of the support feet is equipped with anti-slip rubber pads to increase the friction with the ground and prevent the furnace body from shifting during operation.

[0058] The bottom support foot 12 can be a commercially available threaded lifting foot cup, such as M16 specification. Anti-slip rubber pads are standard accessories. During installation, it is fixed to the reinforcement plate with bolts. The leveling operation only requires rotating the support foot, without the need for professional tools.

[0059] Detailed Workflow Equipment installation and commissioning Furnace body fixing: Place the furnace body on a level production site, rotate the bottom support feet 12 to adjust the height, use a level to calibrate the levelness of the furnace body, and ensure that the anti-slip rubber pads are in close contact with the ground and the furnace body does not wobble; Electrical connection: Connect the lead-out end of the silicon carbide rod electrode to the output end of the thyristor power supply through aluminum foil wiring tape. Connect the input end of the temperature monitoring instrument to 5 K-type thermocouples 11, and the output end to the RS485 interface of the temperature controller. Connect the control end of the temperature controller to the signal end of the power controller. Check that all wiring is secure and not loose, and that the grounding is reliable. Parameter settings: Set the target heating temperature, such as 850℃, through the thermostat panel. Adjust according to the glass material. Activate the PID parameter self-tuning function to optimize the proportional coefficient, such as Kp=2.0, integral coefficient Ki=0.1, and derivative coefficient Kd=0.5. Set the allowable temperature fluctuation range to ±2℃.

[0060] Bar loading and heating preparation Bar screening: Select 25 glass bars with a diameter of 3mm and a length of 50cm to be drawn, and check that the surface of the bars is free from damage, oil stains and impurities; Inserting the rods: Insert 25 glass rods vertically into the 25 rod channels 2 of the high-temperature refractory brick 1, ensuring that the lower end of the rod extends 65-10cm beyond the bottom through hole to facilitate subsequent wire drawing equipment traction, and the upper end is flush with the top through hole 6 to avoid the rods tilting or being inserted too deeply.

[0061] Heating and temperature control operation Heating Start: Press the start button on the power controller, and the silicon carbide rod starts to heat up. The heat is conducted to the uniform temperature chamber through the high-temperature refractory brick 1. The ceramic fiber heat insulation pad 5 and the double-layer end face structure reduce heat loss. Temperature rise and stabilization: In the initial stage, the temperature controller controls the power supply to output full power (6kW), and the temperature inside the temperature equalization chamber rises rapidly; when the temperature reaches 90% of the set value, such as 765℃, the power supply automatically reduces and enters the constant temperature regulation stage; five thermocouples collect temperature data in real time, which is summarized by the temperature monitoring instrument and fed back to the temperature controller. The temperature controller dynamically adjusts the power supply output power through a PID algorithm. After about 30 minutes, the temperature inside the temperature equalization chamber stabilizes within the range of 850℃±2℃. Thermal monitoring: View the temperature data of 5 temperature measuring points in real time through the temperature controller panel to ensure that the temperature difference between the center and the four corners is ≤2℃. If the temperature difference is too large, check the connection status of the silicon carbide rod or adjust the PID parameters.

[0062] Wire drawing operation and shutdown Fiber drawing start: After the temperature stabilizes for 30 minutes and the bar material softens to the preset state, start the fiber drawing equipment to simultaneously pull 25 softened glass bars. The pulling speed is set according to the glass material, such as 1m / min, to carry out parallel fiber drawing or bundled fiber drawing operations. Process monitoring: During the wire drawing process, continuously observe the temperature data displayed by the temperature controller to ensure temperature stability. At the same time, observe the softening state of the rod. If uneven softening occurs in some areas, the operation can be paused to check the alignment of the silicon carbide rod with the channel. Shutdown and cooling: After the wire drawing operation is completed, the cooling program is set through the temperature controller, and the cooling rate is set to 5℃ / min to avoid thermal stress cracking of the furnace body due to sudden cooling; after the temperature inside the furnace drops to below 100℃, the power controller and temperature control system are turned off to complete the operation.

[0063] Equipment maintenance Routine cleaning: After the operation is completed, wait for the furnace body to cool to room temperature, and use compressed air to blow away the dust and debris inside the side protective plate 13 and the heat equalization chamber to avoid accumulation that affects heat dissipation; Component replacement: If the silicon carbide rod is damaged, the temperature will not rise or the temperature difference will be too large. Loosen the bolts 13 on the side protective plate, pull out the damaged silicon carbide rod, replace it with a new silicon carbide rod, and fix it with high-temperature refractory putty. If the thermocouple is damaged, simply remove the fixing bolts on the reinforcing plate and replace it with a new thermocouple. Coating inspection: Every 6 months, inspect the zirconia coating on the inner wall of the temperature equalization chamber. If more than 10% of the area has peeled off, the zirconia coating can be re-sprayed to extend the service life of the high-temperature refractory brick 1.

[0064] All core components of this technical solution, such as high-temperature refractory bricks 1, silicon carbide rods, thermocouples, and temperature controllers, are industrial standard parts with wide procurement channels. Processing techniques, such as drilling, spraying, and assembly, are conventional machining and electrical installation processes, which can be completed by ordinary machining plants and electrical assembly plants. The workflow is clear and easy to operate, requiring no specialized personnel. Through the synergistic effect of each module, stable and uniform heating of 25 glass rods can be achieved, meeting the process requirements of parallel wire drawing. The technical solution possesses sufficient feasibility and industrialization prospects.

[0065] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A matrix-type temperature-controlled furnace for parallel heating and drawing of glass rods, characterized in that, The system includes a core heating and temperature equalization module, a three-dimensional staggered heating assembly, an end-face protection reinforcement module, a closed-loop temperature control system, and a furnace body fixing and support module. The core heating and temperature equalization module is an integrally formed structure. The three-dimensional staggered heating assembly is embedded in the side of the core heating and temperature equalization module. The end-face protection reinforcement module covers both ends of the core heating and temperature equalization module. The closed-loop temperature control system is electrically connected to the three-dimensional staggered heating assembly. The furnace body fixing and support module is assembled at the bottom of the end-face protection reinforcement module and on the side of the core heating and temperature equalization module. The temperature equalization module includes an integrally formed high-temperature refractory brick (1), the three-dimensional staggered heating component includes several rod-shaped electric heating elements (9) and several mounting holes, the rod-shaped electric heating elements (9) are silicon carbide rods, the end face protection enhancement module includes an inner liner plate (3) and an outer reinforcing plate (4), the closed-loop temperature control system includes several K-type thermocouples (11), a temperature monitoring instrument, a temperature controller and a thyristor power supply, and the furnace body fixing support module includes a side protection plate (13) and at least four bottom support feet (12).

2. A matrix temperature-controlled furnace for parallel heating and drawing of glass rods according to claim 1, characterized in that, The high-temperature refractory brick (1) has a cuboid structure and is made of alumina or silicon carbide. The high-temperature refractory brick (1) has a hollowed-out cuboid uniform temperature cavity with uniform wall thickness in all directions. At least 25 circular bar channels (2) are opened through the top and bottom surfaces of the high-temperature refractory brick (1) and are arranged in a 5×5 matrix. The bar channels (2) on the top and bottom surfaces are precisely aligned and the center distance of all adjacent bar channels (2) is equal.

3. A matrix temperature-controlled furnace for parallel heating and drawing of glass rods according to claim 2, characterized in that, The inner wall of the uniform temperature chamber is coated with a high-temperature anti-oxidation coating, and the material of the high-temperature anti-oxidation coating is zirconium oxide; the diameter of the bar channel (2) is Φ8mm, and the center distance between adjacent bar channels (2) is 60mm.

4. A matrix temperature-controlled furnace for parallel heating and drawing of glass rods according to claim 3, characterized in that, The three-dimensional staggered heating assembly includes at least twelve rod-shaped electric heating elements (9) and twenty-four mounting holes. The mounting holes include first mounting holes (7) and second mounting holes (8). Six first mounting holes (7) are opened at the vertical center position of the first opposite side wall of the high-temperature refractory brick (1). Six second mounting holes (8) are opened at a height of 120mm from the bottom surface of the second opposite side wall of the high-temperature refractory brick (1). The first mounting holes (7) and the second mounting holes (8) are spatially staggered and their horizontal projection is aligned with the gap between the bar material channels (2).

5. A matrix temperature-controlled furnace for parallel heating and drawing of glass rods according to claim 4, characterized in that, The rod-shaped heating element (9) is fixed in the first mounting hole (7) and the second mounting hole (8) by high-temperature refractory mortar, and its electrode lead-out end is fitted with a high-temperature insulating sleeve made of corundum material; and all rod-shaped heating elements (9) are connected in parallel by aluminum foil connecting strips.

6. A matrix temperature-controlled furnace for parallel heating and drawing of glass rods according to claim 2, characterized in that, The inner lining plate (3) is in close contact with the top and bottom surfaces of the high-temperature refractory brick (1), and a ceramic fiber heat insulation pad (5) is laid between it and the high-temperature refractory brick (1); the outer reinforcing plate (4) is fastened to the inner lining plate (3) and the high-temperature refractory brick (1) by high-temperature bolts made of alloy material; both the inner lining plate (3) and the outer reinforcing plate (4) have 25 through holes (6), the edges of the through holes (6) are chamfered, and the through holes (6) are adapted to the bar material channel (2).

7. A matrix temperature-controlled furnace for parallel heating and drawing of glass rods according to claim 2, characterized in that, One of the K-type thermocouples (11) is installed at the center of the outer reinforcing plate (4) on the top of the high-temperature refractory brick (1), and the other four K-type thermocouples (11) are respectively installed on the outer reinforcing plates (4) at the four corners of the temperature equalization cavity. The probes of the K-type thermocouples (11) are all inserted into the temperature equalization cavity to a depth of 50mm. The temperature monitoring instrument is electrically connected to the K-type thermocouple (11), and the temperature controller is electrically connected to the temperature monitoring instrument and the thyristor power supply in sequence. The temperature controller is electrically connected to the rod-shaped heating element (9).

8. A matrix temperature-controlled furnace for parallel heating and drawing of glass rods according to claim 1, characterized in that, The side protective plate (13) is arranged around the core heating and temperature equalization module. At least 8cm heat dissipation gap (10) is reserved between the side protective plate (13) and the electrode lead-out end of the rod-shaped heating element. The bottom support foot (12) adopts a threaded lifting installation structure. The bottom of the bottom support foot (12) is provided with an anti-slip rubber pad.

9. A matrix temperature-controlled furnace for parallel heating and drawing of glass rods according to claim 1, characterized in that, The temperature controller has a built-in PID adjustment algorithm to maintain the temperature inside the equalization chamber within the set value ±2℃ range.

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