Atmosphere box type glue removal sintering furnace with rapid cooling function

Abstract

The present application relates to sintering furnace field, disclose a kind of atmosphere box type glue removal sintering furnace with quick cooling function, including furnace body and heating mechanism and air supply mechanism being arranged in the inside of furnace body, the heating mechanism is arranged at the top of the furnace cavity, the output end of the air supply mechanism is connected with the inside of the furnace body, the air supply mechanism is from left to right or from right to left air supply after the heating mechanism is started for predetermined time and forms hot air circulation in the furnace cavity, the furnace body is equipped with rotatable furnace door in front end face, the inner wall of the furnace door is equipped with vent plate, the rear of the vent plate is equipped with heat preservation layer;The present application improves the existing hot air circulation system, solves the problem of low subsequent heat dissipation efficiency due to the design of heat preservation layer;By setting the timing and direction of air supply path, the circulation and discharge of hot air are realized, the uniform distribution of furnace temperature is achieved during the heating stage, the residual heat is quickly removed after stopping heating, and the overall heat dissipation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of sintering furnaces, and more particularly to an atmosphere box-type debinding sintering furnace with rapid cooling function. Background Technology

[0002] In the prior art, in order to maintain the high-temperature environment required for the sintering process, the sintering box is usually equipped with an insulation layer around it to reduce heat loss, improve thermal efficiency, and ensure the stability of the temperature inside the furnace cavity.

[0003] However, after the sintering process is completed, the products inside the furnace often need to be cooled rapidly to meet process requirements or to facilitate removal and entry into the next batch. At this stage, the structure originally intended for heat preservation becomes an obstacle to the cooling process. Because the insulation layer significantly slows down the transfer of heat from the furnace cavity to the external environment, the natural cooling efficiency of the furnace body is low, the temperature drops slowly, and this seriously affects the time efficiency of the entire process.

[0004] Secondly, during the sintering or debinding process, especially when processing ceramics, electrode materials, organic binders or other products containing organic matter, a large amount of volatile organic compounds (such as glue, steam, smoke, etc.) will be generated in the furnace cavity. If these volatile compounds are not discharged in time, they will not only pollute the furnace atmosphere and affect product quality, but may also adhere to the heating elements or inner wall surface, causing furnace pollution or even equipment damage.

[0005] Therefore, how to effectively achieve rapid discharge of volatiles during sintering and efficient cooling of the furnace cavity after sintering has become an important technical issue affecting equipment performance and process efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide an atmosphere box-type debinding sintering furnace with rapid cooling function to solve the problems of existing sintering chambers having insulation layers, which slows down the transfer of heat from the furnace cavity to the external environment after sintering, resulting in low natural cooling efficiency and difficulty in effectively removing the large amount of volatile organic compounds generated during sintering. The specific technical solution is as follows:

[0007] An atmosphere box-type debinding sintering furnace with rapid cooling function includes a furnace body and a heating mechanism and an air supply mechanism disposed inside the furnace body. The furnace body has a furnace cavity inside, the heating mechanism is disposed at the top of the furnace cavity, and the output end of the air supply mechanism is connected to the inner side of the furnace body. After the heating mechanism is started for a predetermined time, the air supply mechanism supplies air from left to right or from right to left and discharges it outward. The furnace body has a rotatable furnace door on the front end face, and the inner wall of the furnace door has a ventilation perforated plate. A heat insulation layer is disposed behind the ventilation perforated plate. When the heating mechanism stops, the air supply mechanism supplies air from back to front and discharges it outward after passing through the ventilation perforated plate.

[0008] As an improvement to the above technical solution, a gas detection mechanism is provided inside the furnace cavity, and the air supply mechanism is used to deliver oxygen, nitrogen or hydrogen into the furnace cavity.

[0009] As one of the improvements to the above technical solution, a return air duct is formed between the ventilation perforated plate and the insulation layer, and the return air duct is connected to an exhaust pipe extending to the outside of the furnace body.

[0010] As an improvement to the above technical solution, the exhaust pipe is connected to one or more valves for controlling the amount of gas passing through the exhaust pipe.

[0011] As one of the improvements to the above technical solution, a humidifier is also included, which is connected to the furnace cavity and used to supply high-temperature humid air to the furnace cavity.

[0012] As an improvement to the above technical solution, the heating mechanism includes a heating element, a fan, and a water-cooled motor. The output end of the water-cooled motor is arranged downwards, and the fan is connected to the output end of the water-cooled motor. The heating element is arranged below the fan.

[0013] As an improvement to the above technical solution, the furnace door is equipped with an electromagnetic lock, and the furnace body is equipped with a latching part for cooperating with the electromagnetic lock.

[0014] As an improvement to the above technical solution, the furnace cavity is provided with several spaced-apart carrier plates from top to bottom, which are used to support the products.

[0015] As an improvement to the above technical solution, the air supply mechanism includes an air outlet duct, which is located on the side of the ventilation perforation plate and has a plurality of air outlet holes.

[0016] As an improvement to the above technical solution, an oil collector is provided at the bottom of the furnace door.

[0017] The beneficial effects of this invention are as follows: By improving the existing hot air circulation system, this invention solves the problem of low heat dissipation efficiency caused by the design of the insulation layer; by setting the timing and direction of the air supply path, it achieves the circulation and exhaust of hot air, ensuring uniform furnace temperature distribution during the heating phase and quickly removing residual heat after heating stops, thus improving overall heat dissipation efficiency. When equipment cleaning and maintenance are required, simply opening the furnace door allows for direct cleaning of the ventilation perforated plate surface or the adhesive collector without disassembling the furnace body or auxiliary structures, significantly improving cleaning efficiency and convenience, and preventing carbon buildup or blockage of volatile substances that could affect future use.

[0018] The closed return air channel formed between the ventilation perforated plate and the insulation layer can quickly guide the high-temperature gases and volatile organic compounds generated in the furnace cavity to the external exhaust system, preventing gases from stagnating in the furnace cavity and improving exhaust efficiency during the debinding and sintering processes. The existence of the return air channel facilitates the formation of a directional airflow path, which helps maintain the dynamic balance of the atmosphere in the furnace cavity. In conjunction with the gas detection mechanism and control valves, the concentrations of nitrogen, oxygen, hydrogen, etc. can be precisely adjusted according to real-time detection data, thereby improving the consistency and controllability of sintering quality. When sintering is completed and the cooling stage begins, the return air channel, in conjunction with the exhaust system, can serve as a forced heat conduction path, accelerating the exhaust process of hot air in the furnace cavity, breaking through the heat dissipation barrier effect of the traditional insulation layer, significantly shortening the cooling time, and improving the production cycle.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the furnace cavity structure of the present invention.

[0023] Figure 3 This is a schematic diagram of the heating mechanism of the present invention.

[0024] Figure 4 This is a schematic diagram of the valve structure of the present invention.

[0025] Figure 5 This is a schematic diagram of the furnace door structure of the present invention.

[0026] Figure 6 This is a schematic diagram of the ventilation perforated plate of the present invention.

[0027] In the diagram: 1. Furnace body; 2. Furnace cavity; 3. Heating mechanism; 4. Air supply mechanism; 5. Furnace door; 6. Insulation layer; 7. Ventilation perforated plate; 8. Return air duct; 9. Exhaust pipe; 10. Valve; 11. Humidifier; 12. Carrier plate; 13. Adhesive oil collector; 31. Water-cooled motor; 32. Heating element; 33. Fan wheel. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0029] The existing sintering chamber, with its insulation layer 6, slows down the heat transfer from the furnace cavity 2 to the external environment after sintering. This results in low natural cooling efficiency of the furnace body 1 and difficulty in effectively removing the large amount of volatile organic compounds generated during sintering. Please refer to [link to relevant documentation]. Figures 1-6 The present invention provides some embodiments to solve the above problems: an atmosphere box type glue removal sintering furnace with rapid cooling function, including a furnace body 1 and a heating mechanism 3 and an air supply mechanism 4 disposed inside the furnace body 1. The furnace body 1 is provided with a furnace cavity 2. The heating mechanism 3 is disposed at the top of the furnace cavity 2. The output end of the air supply mechanism 4 is connected to the inner side of the furnace body 1 and can be connected to one or more inner sides. After the heating mechanism 3 is started for a predetermined time, the air supply mechanism 4 supplies air from left to right or from right to left and forms a hot air circulation in the furnace cavity. The furnace body 1 is provided with a rotatable furnace door 5 at the front end. The inner wall of the furnace door 5 is provided with a ventilation perforated plate 7. A heat insulation layer 6 is provided behind the ventilation perforated plate 7. When the heating mechanism 3 stops, the air supply mechanism 4 supplies air from back to front and discharges it outward after passing through the ventilation perforated plate 7. Preferably, a glue collector 13 is provided at the bottom of the furnace door 5.

[0030] Understandably, in existing technologies, to maintain the high-temperature environment required for the sintering process, the sintering chamber is typically equipped with an insulation layer 6 around its perimeter to reduce heat loss, improve thermal efficiency, and ensure the stability of the internal temperature of the furnace cavity 2. This type of insulation layer 6 is often made of insulating materials such as ceramic fiber cotton, aluminum silicate board, and high-temperature resistant foam. It is relatively thick, has a low thermal conductivity, and effectively prevents heat from being conducted outwards. This is a standard structural configuration for high-temperature furnace bodies 1. Therefore, this invention addresses the problem of low subsequent heat dissipation efficiency caused by the design of the insulation layer 6 by improving the existing hot air circulation system. By setting the timing and direction of the air supply path, the circulation and exhaust of hot air are achieved, resulting in a uniform furnace temperature distribution during the heating phase and rapid removal of residual heat after heating is stopped, thereby improving overall heat dissipation efficiency.

[0031] In some embodiments, the heating mechanism 3 is first activated to raise the temperature in the furnace chamber 2 from 300°C to 500°C. During this process, at 300°C, the air in the furnace chamber 2 is used for sintering. As the temperature is subsequently raised to 500°C, nitrogen is introduced for sintering, which can appropriately reduce the amount of nitrogen used. If the oxygen in the furnace chamber 2 exceeds the standard, hydrogen needs to be introduced for neutralization.

[0032] Preferably, the furnace chamber 2 is equipped with a gas detection mechanism, and the air supply mechanism 4 is used to supply oxygen, nitrogen, or hydrogen into the furnace chamber 2. When the heating mechanism 3 is started, the air in the furnace chamber 2 is used for sintering. During this process, in order to meet the sintering requirements at different stages, the air supply mechanism 4 can simultaneously supplement nitrogen or hydrogen in a timely manner based on the detection data of the gas detection mechanism. For example, in the initial stage of glue removal or the heating stage, when the temperature of the furnace chamber 2 reaches about 300°C, only air can be used for preliminary sintering; when the temperature is further increased to 500°C or above, in order to prevent oxidation reaction or product deterioration, the atmosphere can be switched to nitrogen protection. If the oxygen concentration is detected to be excessive, a certain amount of hydrogen can also be injected to react with oxygen to produce a reduction reaction, thereby achieving precise atmosphere control and optimizing sintering quality.

[0033] After sintering is completed, the heating mechanism 3 stops operating, but the furnace cavity 2 still retains a relatively high temperature and volatile organic compounds released during the debinding process. At this time, in order to accelerate cooling and effectively remove the residual gas in the furnace cavity 2, the air supply mechanism 4 switches the air supply path, supplying air from the rear to the front of the furnace body 1, and then exhausting it outside the furnace after passing through the ventilation perforated plate 7 located on the inner wall of the furnace door 5. Since the ventilation perforated plate 7 is located on the inner wall of the front furnace door 5, and the insulation layer 6 is behind it, it can effectively receive the high-temperature airflow and guide the gas to pass evenly, while preventing heat from being directly conducted to the outer surface of the furnace door 5, thereby ensuring operational safety.

[0034] During this stage, the residual volatile organic compounds inside the furnace chamber 2 will also be discharged outside the furnace along with the forward airflow, or partially intercepted and condensed onto the surface of the ventilation perforation plate 7. Since the ventilation perforation plate 7 is arranged on the inner wall of the rotatable furnace door 5, when equipment cleaning and maintenance are required, simply open the furnace door 5 to directly clean the surface of the ventilation perforation plate 7 without disassembling the furnace body 1 or auxiliary structures, greatly improving cleaning efficiency and convenience, and avoiding carbon buildup or blockage of volatile compounds that could affect the next use.

[0035] This invention, by setting up a switchable air supply mechanism 4, a ventilation perforated plate 7, a heat insulation layer 6, and an atmosphere conditioning system, enables a stable and uniform temperature field and controllable atmosphere during the sintering stage, and rapid and efficient heat dissipation during the cooling stage. At the same time, it achieves effective guidance and discharge of volatiles and convenient cleaning, greatly improving the comprehensive performance and industrial adaptability of the atmosphere box-type debinding sintering furnace.

[0036] In some embodiments, a return air duct 8 is formed between the ventilation perforated plate 7 and the insulation layer 6. The return air duct 8 is connected to an exhaust pipe 9 extending to the outside of the furnace body 1. The exhaust pipe 9 is connected to one or more valves 10 for controlling the gas flow rate of the exhaust pipe 9. Specifically, ventilation perforated plates 7 are provided on all four sides of the inner wall of the furnace cavity 2, and an insulation layer 6 is provided behind the ventilation perforated plate 7. A gap of a certain width is reserved between the ventilation perforated plate 7 and the insulation layer 6. This gap forms an annular return air duct 8 that runs through the circumference of the furnace cavity 2. An exhaust pipe 9 communicating with the outside of the furnace body 1 is provided at one or more positions of the return air duct 8. Multiple valves 10 for controlling the exhaust flow rate can be provided on the exhaust pipe 9 for adjusting the exhaust gas emission efficiency or regulating the flow direction of the gas in the furnace cavity 2.

[0037] The ventilation perforated plate 7 is provided with several evenly distributed through holes or air outlet slots. Driven by the air supply mechanism 4 in the furnace cavity 2, gas (such as oxygen, nitrogen or hot air) is blown into the interior of the furnace cavity 2 from the air outlet pipe. Since the ventilation perforated plate 7 isolates the insulation layer 6 from the space of the furnace cavity 2 while maintaining the gas permeation channel, it not only helps to improve the gas flow efficiency, but also prevents heat radiation from directly acting on the insulation material and extends its service life.

[0038] When a large amount of high-temperature waste gas, adhesive vapor, microparticles, and other volatile byproducts are generated during sintering or adhesive removal, these gases can be effectively guided into the return air duct 8 and discharged in a timely manner through the exhaust pipe 9. The exhaust pipe 9 is connected to an external exhaust gas treatment system, such as a condenser, activated carbon adsorber, or plasma decomposition device, which can further purify the gas before discharge.

[0039] The closed return air channel formed between the ventilation perforated plate 7 and the insulation layer 6 can quickly guide the high-temperature gas and volatile organic compounds generated in the furnace cavity 2 to the external exhaust system, avoiding gas stagnation in the furnace cavity 2 and improving exhaust efficiency during the glue removal and sintering process. The presence of the return air duct 8 facilitates the formation of a directional airflow path, which helps maintain the dynamic balance of the atmosphere in the furnace cavity 2. In conjunction with the gas detection mechanism and control valve 10, the concentrations of nitrogen, oxygen, hydrogen, etc. can be precisely adjusted according to real-time detection data, thereby improving the consistency and controllability of sintering quality. When sintering is completed and the cooling stage begins, the return air duct 8, in conjunction with the exhaust system, can serve as a forced heat conduction path, accelerating the exhaust process of hot air in the furnace cavity 2, breaking through the heat dissipation barrier effect of the traditional insulation layer 6, significantly shortening the cooling time, and improving the production cycle.

[0040] Since the hot airflow no longer acts directly on the surface of the insulation layer 6, but is guided into the return air duct 8 through the ventilation perforated plate 7, the thermal shock and pollution of the insulation material by the high-temperature gas is reduced, its aging and structural deterioration are delayed, and the maintenance frequency and cost are reduced.

[0041] In some embodiments, to meet the humidity requirements of specific debinding or sintering processes, a humidifier 11 is also included in some embodiments. The humidifier 11 is connected to the furnace cavity 2 and is used to supply high-temperature humid air to the furnace cavity 2. The humidifier 11 can be in the form of an electric heating steam generator, an ultrasonic atomizing device, or a high-pressure steam injection system. An independent temperature control heating unit can be set on the humidifier 11 to ensure that the water vapor reaches the target temperature before being injected into the furnace cavity 2.

[0042] To facilitate control of the amount and time of moisture injection, the humidifier 11 can be equipped with a corresponding controller. Based on the stage requirements of the sintering process, the humidifier 11 can be triggered to turn on / off through program control or gas detection feedback signals, thereby achieving intelligent control of the entire process.

[0043] The heating mechanism 3 includes a heating element 32, a fan 33, and a water-cooled motor 31. The output end of the water-cooled motor 31 is arranged downwards, and the fan 33 is connected to the output end of the water-cooled motor 31. The heating element 32 is located below the fan 33. Specifically, the water-cooled motor 31 is arranged vertically with its rotating shaft facing downwards. The fan 33 is coaxially connected to the rotating shaft of the water-cooled motor 31 to achieve rotational drive. The water-cooled motor 31 has a cooling water chamber inside, and the motor is continuously cooled by an external cooling water circulation system to prevent thermal attenuation or damage during long-term operation at the top of the high-temperature furnace cavity 2, thereby improving the safety and stability of the system operation.

[0044] When the impeller 33 rotates, it will form a high-speed airflow that is vertically downward. This airflow is first heated by the heating element 32, and then drives the hot air to flow to the lower part of the furnace cavity 2, which promotes the hot air to form a forced thermal circulation in the furnace cavity 2 and improves the uniformity of temperature distribution in various areas of the furnace cavity 2.

[0045] In some embodiments, in order to enhance the airtightness and safety of the furnace door 5, the furnace door 5 is provided with an electromagnetic lock structure, and the furnace body 1 is correspondingly provided with a latching part that cooperates with the electromagnetic lock. Under the control of the controller, the electromagnetic lock can automatically lock and unlock. When the equipment is in a heating or hazardous atmosphere operation state, the electromagnetic lock remains closed to prevent personnel from accidentally opening the furnace door 5. After the temperature drops to a safe temperature or the exhaust is completed, the electromagnetic lock is released by the controller to allow opening.

[0046] In some embodiments, the air supply mechanism 4 further includes an air outlet duct arranged on the side of the ventilation hole plate 7 of the furnace cavity 2. The air outlet duct is evenly provided with a plurality of air outlet holes for directionally supplying atmospheric gas or circulating hot air to different heights or different areas of the furnace cavity 2. The size, angle and number of the air outlet holes can be designed and optimized according to the size of the furnace cavity 2 and the airflow requirements.

[0047] In some embodiments, a plurality of spaced-apart carrier plates 12 are arranged vertically inside the furnace cavity 2. These carrier plates are typically made of high-temperature alloys, stainless steel plates, or ceramic plates. The carrier plates 12 have holes, and each carrier plate 12 can hold a product to be processed, such as a ceramic element, electrode sheet, or powder compact. The spacing between the carrier plates 12 can be adjusted according to the product thickness or airflow distribution requirements, supporting multi-layer stacked heating treatment.

[0048] In some embodiments, considering that the direct discharge of gases such as nitrogen and hydrogen during the sintering process will increase gas loss, and that the gas in the furnace cavity 2 after sintering usually contains volatile byproducts such as microparticles, in order to take into account the cooling effect, a cooling channel can be provided around the outside of the furnace cavity 2, and a separate blower can be connected to the cooling channel. The blower continuously delivers gas to remove the heat from the furnace cavity 2, thereby achieving rapid cooling. The above can be flexibly adapted according to the application scenario.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. An atmosphere box-type debinding sintering furnace with rapid cooling function, characterized in that, The furnace includes a furnace body and a heating mechanism and an air supply mechanism disposed inside the furnace body. The furnace body has a furnace cavity inside, and the heating mechanism is disposed at the top of the furnace cavity. The output end of the air supply mechanism is connected to the inner side of the furnace body. After the heating mechanism is started for a predetermined time, the air supply mechanism supplies air from left to right or from right to left and forms a hot air circulation in the furnace cavity. The furnace body has a rotatable furnace door on the front end face. The inner wall of the furnace door has a ventilation perforated plate. A heat insulation layer is disposed behind the ventilation perforated plate. When the heating mechanism stops, the air supply mechanism supplies air from back to front and discharges it outward after passing through the ventilation perforated plate.

2. The atmosphere box-type debinding sintering furnace with rapid cooling function according to claim 1, characterized in that: The furnace cavity is equipped with a gas detection mechanism, and the air supply mechanism is used to deliver oxygen, nitrogen or hydrogen into the furnace cavity.

3. The atmosphere box-type debinding sintering furnace with rapid cooling function according to claim 2, characterized in that: A return air duct is formed between the ventilation perforated plate and the insulation layer, and the return air duct is connected to an exhaust pipe extending to the outside of the furnace body.

4. The atmosphere box-type debinding sintering furnace with rapid cooling function according to claim 3, characterized in that: The exhaust pipe is connected to one or more valves for controlling the amount of gas passing through the exhaust pipe.

5. The atmosphere box-type debinding sintering furnace with rapid cooling function according to claim 1, characterized in that: It also includes a humidifier, which is connected to the furnace cavity and used to supply high-temperature humid air to the furnace cavity.

6. The atmosphere box-type debinding sintering furnace with rapid cooling function according to claim 1, characterized in that: The heating mechanism includes a heating element, a fan, and a water-cooled motor. The output end of the water-cooled motor is arranged downwards, and the fan is connected to the output end of the water-cooled motor. The heating element is arranged below the fan.

7. The atmosphere box-type debinding sintering furnace with rapid cooling function according to claim 1, characterized in that: The furnace door is equipped with an electromagnetic lock, and the furnace body is equipped with a latching part for engaging the electromagnetic lock.

8. The atmosphere box-type debinding sintering furnace with rapid cooling function according to claim 1, characterized in that: The furnace cavity is provided with several spaced-apart carrier plates from top to bottom, which are used to support products.

9. The atmosphere box-type debinding sintering furnace with rapid cooling function according to claim 2, characterized in that: The air supply mechanism includes an air outlet duct, which is located on the side of the ventilation perforation plate and has a plurality of air outlet holes.

10. The atmosphere box-type debinding sintering furnace with rapid cooling function according to claim 1, characterized in that: The bottom of the furnace door is equipped with an oil collector.

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