Thermal cycle structure of high-temperature sintering furnace

Abstract

The invention discloses a thermal cycle structure of a high-temperature sintering furnace, which belongs to the technical field of high-temperature sintering furnaces and comprises a base, a support frame is arranged at the upper end of the base, a furnace body is arranged in the support frame, a sealing cover is arranged on the side edge of the furnace body, the furnace body is rotatably connected with the sealing cover through a pin shaft, and a sealing ring is arranged on the inner side of the sealing cover. Through the arrangement of the rotating mechanism, the furnace body rotates at a constant speed after a motor drives a gear ring through a transmission gear, a limiting ring is matched with an annular groove to ensure axial positioning, a hidden spray head continuously sprays hot air along with rotation, and the temperature difference between the interior and the exterior of a material layer is rapidly reduced; the sintering time is shortened, densification is more uniform, meanwhile, forced convection of smoke is formed in a hearth through the rotation action, heat is secondarily carried to the surface of materials, the heat utilization rate is increased, and energy consumption is remarkably reduced.

Description

Technical Field

[0001] This invention belongs to the field of high-temperature sintering furnace technology, and specifically relates to a high-temperature sintering furnace thermal circulation structure. Background Technology

[0002] A high-temperature sintering furnace is a specialized thermal equipment used for solid-state sintering of ceramics, powder metallurgy, or cemented carbide blanks within the temperature range of 1200℃ to 1800℃. Its basic structure consists of a refractory furnace chamber, heating elements, an insulation layer, and a fixed material platform. During operation, heat is transferred unidirectionally to the stationary material via radiation and convection, achieving densification and grain growth. Due to low furnace space utilization and limited material layer thickness, the single-furnace processing capacity is small, and energy consumption is generally higher than 2000 kWh. Rotary kiln calcination has become a key aspect of energy conservation and emission reduction in high-end manufacturing.

[0003] Existing high-temperature sintering furnaces have fixed furnace chambers and charging platforms, keeping the materials stationary throughout the sintering process. This results in a large temperature difference between the center and surface of the material layer, leading to uneven heating. Extended holding times are necessary to ensure core sintering quality, causing a decrease in thermal efficiency of over 15%. Simultaneously, high-temperature flue gas is directly discharged during dehumidification and binder removal stages, preventing the recovery of sensible and latent heat, resulting in significant energy waste. Furthermore, the fixed horizontal charging platform necessitates vertical lifting for feeding, sampling, and maintenance operations. The large furnace door opening and prolonged opening time increase heat loss and limit flexible connections between the furnace and upstream / downstream processes, making it difficult to meet the demands of continuous and automated modern production. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention provides a high-temperature sintering furnace thermal circulation structure, which facilitates furnace rotation, high-temperature flue gas recycling, and angle adjustment of the high-temperature sintering furnace.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-temperature sintering furnace thermal circulation structure, including a base, a support frame provided at the upper end of the base, a furnace body provided inside the support frame, a sealing cover provided on the side of the furnace body, the furnace body and the sealing cover being rotatably connected by a pin, a sealing ring provided on the inner side of the sealing cover, a controller provided at the upper corner of the base, a rotating mechanism provided on the surface of the furnace body, and an angle adjustment mechanism connected between the base and the support frame;

[0006] The rotating mechanism includes a gear ring, a gear ring is provided on the surface of the center position of the furnace body, a drive component is provided at the lower end of the gear ring, a heating component is provided on the inner wall of the furnace body, and a flue gas recycling component is provided on the other side of the furnace body.

[0007] Preferably, the furnace body further includes limiting rings, with limiting rings provided on both ends of the furnace body, and annular grooves corresponding to the limiting rings being opened inside the support frame.

[0008] Preferably, the drive assembly includes a motor, the motor is provided at the lower side of the support frame, the output end of the motor is provided with a drive shaft, and the other end of the drive shaft is provided with a transmission gear that meshes with a gear ring.

[0009] Preferably, the heating assembly includes a heating ring, the inner wall of the furnace body is provided with a heating ring, and the inner wall of the heating ring is provided with multiple sets of concealed nozzles.

[0010] Preferably, the flue gas recycling component includes a flue pipe, a flue pipe is provided on the other side of the furnace body, a return flue pipe is provided at the upper end of the flue pipe and connected to the heating ring inside the furnace body, a second solenoid valve is provided on the side of the return flue pipe, and a first solenoid valve is provided at the other end of the flue pipe.

[0011] Preferably, a pressure gauge is installed on the side of the exhaust pipe near the furnace body.

[0012] Preferably, the pressure gauge monitors the gas pressure inside the furnace body and transmits the monitored pressure data to the controller, which then controls solenoid valve one and solenoid valve two to open and close accordingly.

[0013] Preferably, the angle adjustment mechanism includes a fixing block, two sets of fixing blocks are fixed on one side of the lower end of the support frame, two sets of hinge seats are provided on the upper side of the base, the hinge seats and the fixing blocks are rotatably connected by a rotating shaft, two sets of hinge seats are provided on the other side of the lower end of the support frame, the lower end of the hinge seats is rotatably connected to a rotating frame by a rotating shaft, the lower end of the rotating frame is rotatably connected to a hinge seat, the lower end of the hinge seat is provided with a T-shaped nut block, one set of T-shaped nut blocks is internally threaded to a lead screw, the other set of T-shaped nut blocks is internally threaded to a lead screw, and the other end of the lead screw and lead screw is provided with a transmission component.

[0014] Preferably, the transmission assembly includes a mounting box, with the mounting box located on the side of the base, and a second motor located on the side of the mounting box. The output end of the second motor is connected to one end of a lead screw. A first synchronous pulley is located inside the mounting box on the surface of the first lead screw, and a second synchronous pulley is located inside the mounting box on one end of the second lead screw. A synchronous belt is meshed between the outer surfaces of the first and second synchronous pulleys.

[0015] Preferably, the other ends of both lead screw one and lead screw two are rotatably connected to the base via bearings, and the interiors of both sets of T-shaped nut blocks are provided with corresponding screw holes for lead screw one and lead screw two and are threadedly connected to them.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention features a rotating mechanism. The furnace body rotates at a constant speed after being driven by a gear ring via a motor. The limiting ring and the annular groove cooperate to ensure axial positioning. The concealed nozzle continuously sprays hot gas as the material rotates, rapidly reducing the temperature difference between the inside and outside of the material layer, shortening the sintering time, and making densification more uniform. At the same time, the rotation causes the flue gas to form forced convection in the furnace, and the heat is carried a second time to the surface of the material, improving the heat utilization rate and significantly reducing energy consumption.

[0017] 2. This invention incorporates a flue gas recycling component. A pressure gauge monitors the furnace pressure in real time and sends the signal to the controller. The controller opens and closes solenoid valve one and solenoid valve two according to a set logic, allowing high-temperature flue gas to flow back to the heating ring through the flue gas return pipe. After mixing with fresh hot gas, the gas is sprayed back onto the material. Both sensible heat and latent heat are recovered, there is no heat waste during the dehumidification stage, the furnace heating rate is accelerated, and the temperature of the exhaust gas is reduced, achieving the dual goals of energy saving and emission reduction.

[0018] 3. This invention features an angle adjustment mechanism. Motor 2 drives lead screw 1 and lead screw 2 simultaneously via a synchronous belt. The T-shaped nut block pushes and pulls the rotating frame synchronously, and the support frame rotates smoothly around the hinge seat 1. The furnace body tilt angle can be adjusted arbitrarily within a continuous range. Feeding, unloading, and maintenance operations are changed from horizontal to inclined sliding. The furnace door opening time is shortened, heat loss is reduced, manual intervention is reduced, and the connection between the equipment and the preceding and following processes is more flexible, meeting the needs of automated production lines. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a three-dimensional sectional view of the rotating mechanism of the present invention; Figure 3 This is a perspective view of the heating component of the present invention; Figure 4 This is a three-dimensional sectional view of the support frame location of the present invention; Figure 5 This is a perspective view of the flue gas recycling component of the present invention; Figure 6 This is a three-dimensional sectional view of the angle adjustment mechanism of the present invention; Figure 7 This is an enlarged view of the transmission component of the present invention; In the diagram: 1. Base; 2. Support frame; 3. Furnace body; 4. Pin; 5. Sealing cover; 6. Rotating mechanism; 61. Gear ring; 62. Limiting ring; 63. Annular groove; 64. Heating component; 641. Heating ring; 642. Concealed nozzle; 65. Drive component; 651. Motor 1; 652. Drive shaft; 653. Transmission gear; 66. Flue gas recirculation component; 661. Exhaust pipe; 662. Solenoid valve 1; 663. Return... 664. Smoke pipe; 665. Solenoid valve II; 6666. Pressure gauge; 7. Angle adjustment mechanism; 71. Hinge seat I; 72. Fixing block; 73. Transmission assembly; 731. Mounting box; 732. Synchronous pulley II; 733. Synchronous belt; 734. Motor II; 735. Synchronous pulley I; 74. Lead screw I; 75. Lead screw II; 76. T-nut block; 77. Hinge seat II; 78. Rotating frame; 79. Hinge seat III; 8. Sealing ring; 9. Controller. Detailed Implementation

[0020] 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.

[0021] Example 1 Please see Figure 1-7 The present invention provides the following technical solution: a high-temperature sintering furnace thermal circulation structure, including a base 1, a support frame 2 is provided at the upper end of the base 1, a furnace body 3 is provided inside the support frame 2, a sealing cover 5 is provided on the side of the furnace body 3, the furnace body 3 and the sealing cover 5 are rotatably connected by a pin 4, a sealing ring 8 is provided on the inner side of the sealing cover 5, a controller 9 is provided at the upper corner of the base 1, a rotating mechanism 6 is provided on the surface of the furnace body 3, and an angle adjustment mechanism 7 is connected between the base 1 and the support frame 2; The rotating mechanism 6 includes a gear ring 61. The gear ring 61 is provided on the surface of the center position of the furnace body 3. The lower end of the gear ring 61 is provided with a drive component 65. The inner wall of the furnace body 3 is provided with a heating component 64. The other side of the furnace body 3 is provided with a flue gas recycling component 66.

[0022] Specifically, the furnace body 3 also includes a limiting ring 62. The two end surfaces of the furnace body 3 are provided with limiting rings 62, and the inside of the support frame 2 is provided with annular grooves 63 corresponding to the limiting rings 62. By adopting the above technical solution, the furnace body 3 can rotate stably within the support frame 2 without axial movement. At the same time, the annular grooves 63 can be filled with high-temperature grease to further reduce frictional resistance and wear, and improve the reliability of long-term operation.

[0023] Specifically, the drive assembly 65 includes a motor 651. The motor 651 is located at the lower side of the support frame 2. The output end of the motor 651 is equipped with a drive shaft 652. The other end of the drive shaft 652 is equipped with a transmission gear 653 that meshes with the gear ring 61. By adopting the above technical solution, the motor 651 drives the gear ring 61 to rotate via the transmission gear 653, thereby achieving uniform rotation of the furnace body 3. The transmission gear 653 and the gear ring 61 adopt an involute tooth profile design, which ensures smooth meshing, low noise, and easy disassembly and maintenance in the future.

[0024] Specifically, the heating component 64 includes a heating ring 641, which is installed on the inner wall of the furnace body 3. The inner wall of the heating ring 641 is provided with multiple sets of concealed nozzles 642. By adopting the above technical solution, the concealed nozzles 642 can still uniformly spray hot air onto the material in the rotating state, forming a turbulent flow field, which allows heat to quickly penetrate into the material layer and significantly shorten the sintering cycle. The nozzles are made of high-temperature resistant alloy and coated with an anti-oxidation coating, which extends their service life.

[0025] Specifically, the flue gas recycling component 66 includes an exhaust pipe 661. An exhaust pipe 661 is provided on the other side of the furnace body 3. An exhaust pipe 663 is provided at the upper end of the exhaust pipe 661 and is connected to the heating ring 641 inside the furnace body 3. A second solenoid valve 664 is provided on the side of the exhaust pipe 663, and a first solenoid valve 662 is provided at the other end of the exhaust pipe 661. By adopting the above technical solution, high-temperature flue gas can re-enter the furnace through the exhaust pipe 663 to realize heat recycling. Both the first solenoid valve 662 and the second solenoid valve 664 adopt high-temperature stainless steel valve bodies, and the sealing surface is overlaid with hard alloy to ensure zero leakage under long-term high-temperature conditions.

[0026] Specifically, a pressure gauge 665 is installed on the side of the flue pipe 661 near the furnace body 3. By adopting the above technical solution, the pressure gauge 665 monitors the furnace pressure in real time and provides the controller 9 with a judgment signal for opening and closing the solenoid valve. The pressure gauge 665 is selected as a high temperature resistant and vibration resistant type, and the dial is coated with a fluorescent coating, which is easy to read in a dim environment.

[0027] Specifically, pressure gauge 665 monitors the air pressure inside furnace body 3 and transmits the monitored pressure data to controller 9. Controller 9 controls solenoid valve 662 and solenoid valve 664 to open and close accordingly. By adopting the above technical solution, a closed-loop control is formed to prevent overpressure or heat loss inside the furnace. Controller 9 has a built-in PID algorithm that can adjust the valve opening in advance according to the pressure fluctuation trend, thereby improving the system response speed and stability.

[0028] In this embodiment, the sealing cover 5 is first opened and materials are loaded. After closing, the motor 651 is started by the controller 9. The furnace body 3 rotates smoothly under the cooperation of the limiting ring 62 and the annular groove 63. The heating ring 641 heats up while the concealed nozzle 642 sprays hot air, so that the materials are heated evenly. The flue gas in the furnace enters the return flue pipe 663 through the exhaust pipe 661 for circulation. The pressure gauge 665 provides real-time feedback. The controller 9 switches between the solenoid valve 662 and the solenoid valve 664 as needed to achieve the dual purpose of energy saving and protection. Throughout the process, the sealing ring 8 ensures the airtightness of the furnace and prevents the backflow of cold air from the outside, further reducing energy consumption.

[0029] Example 2 The difference between this embodiment and embodiment 1 is that: the angle adjustment mechanism 7 includes a fixing block 72; two sets of fixing blocks 72 are fixed on one side of the lower end of the support frame 2; two sets of hinge seats 71 are provided on the upper side of the base 1; the hinge seats 71 and the fixing blocks 72 are rotatably connected by a rotating shaft; two sets of hinge seats 79 are provided on the other side of the lower end of the support frame 2; the lower end of the hinge seats 79 is rotatably connected to a rotating frame 78 by a rotating shaft; the lower end of the rotating frame 78 is rotatably connected to a hinge seat 77 by a rotating shaft; the hinge seat 77... The lower end of 77 is provided with a T-shaped nut block 76. One set of T-shaped nut blocks 76 is internally threaded with a lead screw 74, and another set of T-shaped nut blocks 76 is internally threaded with a lead screw 75. The other end of the lead screw 74 and the lead screw 75 is provided with a transmission assembly 73. By adopting the above technical solution, the overall tilt angle of the support frame 2 and the furnace body 3 can be continuously adjusted. The rotating frame 78 adopts a box-shaped welded structure with internal reinforcing ribs to ensure sufficient rigidity under high load and avoid swaying during tilt angle adjustment.

[0030] Specifically, the transmission assembly 73 includes a mounting box 731. The mounting box 731 is located on the side of the base 1, and a second motor 734 is located on the side of the mounting box 731. The output end of the second motor 734 is connected to one end of a lead screw 74. A first synchronous pulley 735 is located inside the mounting box 731 on the surface of the first lead screw 74. A second synchronous pulley 732 is located inside the mounting box 731 on one end of the second lead screw 75. A synchronous belt 733 is meshed with the outer surfaces of the first synchronous pulley 735 and the second synchronous pulley 732. By adopting the above technical solution, the second motor 734 can achieve synchronous rotation of the two lead screws with a single input, ensuring smooth lifting. The synchronous belt 733 is made of high-temperature resistant polyurethane matrix and Kevlar fiber core, and can work for a long time in an environment of 200 ℃ without additional cooling.

[0031] Specifically, the other ends of lead screw 1 74 and lead screw 2 75 are rotatably connected to base 1 via bearings. The interiors of the two sets of T-shaped nut blocks 76 are provided with corresponding threaded holes for lead screw 1 74 and lead screw 2 75 and are threadedly connected to them. By adopting the above technical solution, the rotation of the lead screw is converted into the linear displacement of the T-shaped nut block 76, thereby pushing and pulling the rotating frame 78 to complete the angle change. The surface of the lead screw is treated with high frequency quenching and hard chrome plating, which has both high hardness and corrosion resistance. The nut block is inlaid with a copper alloy self-lubricating sleeve, which extends the maintenance-free cycle.

[0032] In this embodiment, when the furnace body 3 needs to be tilted for unloading or maintenance, the controller 9 starts the second motor 734. The first synchronous pulley 735 and the second synchronous pulley 732 rotate at the same speed under the action of the synchronous belt 733. The first lead screw 74 and the second lead screw 75 synchronously drive the T-shaped nut block 76 to move forward or backward, and the rotating frame 78 swings accordingly. The support frame 2 rotates around the hinge seat 71, and the tilt angle of the furnace body 3 can be adjusted as needed. During the tilt angle change, the limit ring 62 still maintains cooperation with the annular groove 63 to ensure that the rotation function of the furnace body 3 is not affected. After the operation is completed, the reverse operation can reset it. The entire adjustment process does not require manual intervention, which reduces labor intensity and avoids the risk of high temperature burns.

[0033] Working principle and usage process of the present invention: When in use, the furnace body 3 is rotated at a uniform speed by the rotating mechanism 6, and the material is heated evenly under the dual action of the heating ring 641 and the hidden nozzle 642, thus shortening the sintering cycle.

[0034] The flue gas recycling component 66 recirculates high-temperature flue gas for reuse, reducing energy consumption and emissions.

[0035] The angle adjustment mechanism 7 can quickly adjust the tilt angle of the furnace body 3 to meet the needs of feeding, unloading and maintenance; the sealing ring 8 and high-temperature lubricating grease together ensure the airtightness and smooth operation of the system.

[0036] The entire process is centrally controlled by controller 9, enabling efficient, energy-saving, safe, and automated high-temperature sintering operations.

[0037] 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 high-temperature sintering furnace thermal circulation structure, comprising a base (1), a support frame (2) provided at the upper end of the base (1), a furnace body (3) provided inside the support frame (2), a sealing cover (5) provided on the side of the furnace body (3), the furnace body (3) and the sealing cover (5) being rotatably connected by a pin (4), a sealing ring (8) provided on the inner side of the sealing cover (5), and a controller (9) provided at the upper corner of the base (1), characterized in that: A rotating mechanism (6) is provided on the surface of the furnace body (3), and an angle adjustment mechanism (7) is connected between the base (1) and the support frame (2). The rotating mechanism (6) includes a toothed ring (61), a toothed ring (61) is provided on the surface of the center position of the furnace body (3), a drive assembly (65) is provided at the lower end of the toothed ring (61), a heating assembly (64) is provided on the inner wall of the furnace body (3), and a flue gas recycling assembly (66) is provided on the other side of the furnace body (3).

2. The high-temperature sintering furnace thermal circulation structure according to claim 1, characterized in that: The furnace body (3) also includes a limiting ring (62). The two ends of the furnace body (3) are provided with limiting rings (62), and the inside of the support frame (2) is provided with annular grooves (63) corresponding to the limiting rings (62).

3. The high-temperature sintering furnace thermal circulation structure according to claim 1, characterized in that: The drive assembly (65) includes a motor (651), the lower side of the support frame (2) is provided with a motor (651), the output end of the motor (651) is provided with a drive shaft (652), and the other end of the drive shaft (652) is provided with a transmission gear (653) that meshes with the gear ring (61).

4. The high-temperature sintering furnace thermal circulation structure according to claim 1, characterized in that: The heating component (64) includes a heating ring (641), and the inner wall of the furnace body (3) is provided with a heating ring (641). The inner wall of the heating ring (641) is provided with multiple sets of concealed nozzles (642).

5. The high-temperature sintering furnace thermal circulation structure according to claim 4, characterized in that: The flue gas recycling component (66) includes a flue pipe (661), a flue pipe (661) is provided on the other side of the furnace body (3), a return flue pipe (663) is provided at the upper end of the flue pipe (661) and is connected to the heating ring (641) inside the furnace body (3), a second solenoid valve (664) is provided on the side of the return flue pipe (663), and a first solenoid valve (662) is provided at the other end of the flue pipe (661).

6. The high-temperature sintering furnace thermal circulation structure according to claim 5, characterized in that: A pressure gauge (665) is installed on the side of the exhaust pipe (661) near the furnace body (3).

7. The high-temperature sintering furnace thermal circulation structure according to claim 1, characterized in that: The pressure gauge (665) monitors the air pressure inside the furnace body (3) and transmits the monitored pressure data to the controller (9). The controller (9) controls the opening and closing of solenoid valve one (662) and solenoid valve two (664).

8. The high-temperature sintering furnace thermal circulation structure according to claim 1, characterized in that: The angle adjustment mechanism (7) includes a fixing block (72). Two sets of fixing blocks (72) are fixed on one side of the lower end of the support frame (2). Two sets of hinge seats (71) are provided on the upper side of the base (1). The hinge seats (71) and the fixing blocks (72) are rotatably connected by a rotating shaft. Two sets of hinge seats (79) are provided on the other side of the lower end of the support frame (2). The lower end of the hinge seats (79) is rotatably connected to a rotating frame (78) by a rotating shaft. The lower end of the rotating frame (78) is rotatably connected to a hinge seat (77) by a rotating shaft. The lower end of the hinge seat (77) is provided with a T-shaped nut block (76). The internal threads of one set of T-shaped nut blocks (76) are connected to a lead screw (74). The internal threads of another set of T-shaped nut blocks (76) are connected to a lead screw (75). The other ends of the lead screw (74) and the lead screw (75) are provided with a transmission assembly (73).

9. The high-temperature sintering furnace thermal circulation structure according to claim 8, characterized in that: The transmission assembly (73) includes a mounting box (731). The mounting box (731) is provided on the side of the base (1). The second motor (734) is provided on the side of the mounting box (731). The output end of the second motor (734) is connected to one end of the lead screw (74). The surface of the lead screw (74) is located inside the mounting box (731) and a first synchronous pulley (735) is provided. The surface of one end of the second lead screw (75) is located inside the mounting box (731) and a second synchronous pulley (732) is provided. The outer surfaces of the first synchronous pulley (735) and the second synchronous pulley (732) are meshed with a synchronous belt (733).

10. The high-temperature sintering furnace thermal circulation structure according to claim 8, characterized in that: The other ends of the lead screw 1 (74) and lead screw 2 (75) are rotatably connected to the base (1) through bearings. The interior of the two sets of T-shaped nut blocks (76) is provided with corresponding screw holes for lead screw 1 (74) and lead screw 2 (75) and is threadedly connected to them.

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