Atmosphere box type glue discharging sintering furnace with rapid cooling function

Abstract

The invention relates to the field of sintering furnaces, and discloses an atmosphere box type glue discharging sintering furnace with a rapid cooling function, the atmosphere box type glue discharging sintering furnace comprises a furnace body, a heating mechanism and an air supply mechanism, the heating mechanism and the air supply mechanism are arranged in the furnace body, the heating mechanism is arranged at the top of a furnace cavity, and the output end of the air supply mechanism is connected with the inner side face of the furnace body; the air supply mechanism supplies air from left to right or from right to left after the heating mechanism is started for a preset time, hot air circulation is formed in the furnace cavity, a rotatable furnace door is arranged on the front end face of the furnace body, a ventilation hole plate is arranged on the inner wall of the furnace door, and a heat preservation layer is arranged behind the ventilation hole plate. By improving an existing hot air circulating system, the problem that the subsequent heat dissipation efficiency is low due to the design of a heat preservation layer is solved; by setting the time sequence and direction of an air supply path, circulation and discharge of hot air are achieved, furnace temperature is evenly distributed in the heating stage, residual heat is rapidly taken away after heating is stopped, and the overall heat dissipation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of sintering furnaces, and in particular to an atmosphere box type debinding sintering furnace with a rapid cooling function. Background Art

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

[0003] However, after the sintering process is completed, the products in the furnace often need to be cooled quickly to meet process requirements or to facilitate removal and entry into the next batch. During this stage, the structure originally used for insulation becomes an obstacle to the cooling process. Because the insulation layer significantly slows 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 the time efficiency of the entire process is seriously affected. 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 cavity atmosphere and affect product quality, but may also adhere to the heating elements or inner wall surface, causing furnace pollution and even equipment damage. Therefore, how to effectively achieve the rapid discharge of volatiles during the sintering process and achieve efficient cooling of the furnace chamber after sintering has become an important technical issue affecting equipment performance and process efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide an atmosphere box type debinding sintering furnace with a rapid cooling function to solve the problem that the existing sintering box body is provided with a thermal insulation layer, which slows down the transfer of heat from the furnace cavity to the external environment after sintering is completed, resulting in low efficiency of natural cooling of the furnace body and difficulty in effectively discharging a large amount of volatile organic compounds generated during the sintering process. The specific technical solution is as follows: An atmosphere box-type debinding sintering furnace with a rapid cooling function comprises a furnace body and a heating mechanism and an air supply mechanism arranged inside the furnace body. A furnace cavity is provided inside the furnace body, the heating mechanism is arranged at the top of the furnace cavity, the output end of the air supply mechanism is connected to the inner side surface of the furnace body, the air supply mechanism supplies air from left to right or from right to left and discharges it outward after the heating mechanism is started for a predetermined time, the furnace body is provided with a rotatable furnace door at the front end face, the inner wall of the furnace door is provided with a ventilation hole plate, and an insulation layer is provided behind the ventilation hole 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 hole plate.

[0005] As one of the improvements of the above technical solution, a gas detection mechanism is provided in the furnace cavity, and the air supply mechanism is used to transport oxygen, nitrogen or hydrogen into the furnace cavity.

[0006] As one of the improvements of the above technical solution, a return air duct is formed between the ventilation hole plate and the thermal insulation layer, and the return air duct is connected to an exhaust pipe extending to the outside of the furnace body.

[0007] As one of the improvements of 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.

[0008] As one of the improvements of the above technical solution, a humidifier is further included, which is connected to the furnace cavity and is used to transport high-temperature moisture to the furnace cavity.

[0009] As one of the improvements of the above technical solution, the heating mechanism includes a heating element, a wind wheel and a water-cooled motor, the output end of the water-cooled motor is set downward and the wind wheel is connected to the output end of the water-cooled motor, and the heating element is set below the wind wheel.

[0010] As one of the improvements of the above technical solution, the furnace door is provided with an electromagnetic lock, and the furnace body is provided with a snap-fit ​​portion for cooperating with the electromagnetic lock.

[0011] As one of the improvements of the above technical solution, a plurality of carrier plates are provided at intervals from top to bottom inside the furnace cavity, and the carrier plates are used to carry products.

[0012] As one of the improvements of the above technical solution, the air supply mechanism includes an air outlet duct, the air outlet duct is arranged on the side of the ventilation hole plate, and a plurality of air outlet holes are provided on the air outlet duct.

[0013] As one of the improvements of the above technical solution, a rubber oil collector is provided at the bottom of the furnace door.

[0014] The beneficial effects of the present invention are as follows: By improving the existing hot air circulation system, the present invention solves the problem of low subsequent heat dissipation efficiency caused by the design of the insulation layer. By setting the timing and direction of the air supply path, the circulation and exhaust of hot air are achieved, achieving uniform furnace temperature distribution during the heating phase and quickly removing residual heat after heating stops, thereby improving overall heat dissipation efficiency. When equipment cleaning and maintenance are required, simply open the furnace door to directly clean the vent plate surface or the oil collector without disassembling the furnace body or auxiliary structures, greatly improving cleaning efficiency and convenience, and preventing carbon accumulation or blockage of volatile substances that may affect the next use. The closed return air channel formed between the ventilation plate and the insulation layer can quickly guide the high-temperature gas and volatile organic compounds generated in the furnace cavity to the external exhaust system, avoiding gas retention in the furnace cavity and improving the exhaust efficiency during debinding and sintering. The existence of the return air channel facilitates the formation of a directional airflow path, which helps to maintain the dynamic balance of the atmosphere in the furnace cavity. In conjunction with the gas detection mechanism and control valve, the concentration of nitrogen, oxygen, hydrogen, etc. can also be accurately adjusted according to real-time detection data, thereby improving the consistency and controllability of the sintering quality. When sintering is completed and enters the cooling stage, the return air channel and the exhaust system can be used as a forced heat conduction path to accelerate the discharge process of hot air in the furnace cavity, break through the barrier effect of the traditional insulation layer on heat dissipation, significantly shorten the cooling time, and improve the production rhythm.

[0015] Additional aspects and advantages of the present invention will be given in part in the description below, and in part will become apparent from the description below, or will be understood through the practice of the present invention. Of course, it is not necessary to achieve all of the advantages described above at the same time to implement any product or method of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 It is a structural schematic diagram of the furnace chamber of the present invention.

[0019] Figure 3 It is a structural schematic diagram of the heating mechanism of the present invention.

[0020] Figure 4 It is a structural schematic diagram of the valve of the present invention.

[0021] Figure 5 It is a structural schematic diagram of a furnace door of the present invention.

[0022] Figure 6 It is a structural schematic diagram of the ventilation hole plate of the present invention.

[0023] In the figure: 1. Furnace body; 2. Furnace cavity; 3. Heating mechanism; 4. Air supply mechanism; 5. Furnace door; 6. Insulation layer; 7. Ventilation plate; 8. Return air duct; 9. Exhaust pipe; 10. Valve; 11. Humidifier; 12. Carrier plate; 13. Rubber oil collector; 31. Water-cooled motor; 32. Heating element; 33. Wind wheel. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0025] Due to the fact that the existing sintering box body is provided with the insulation layer 6, the heat transfer speed of the furnace chamber 2 to the external environment is delayed after the sintering is completed, resulting in low efficiency of the natural cooling of the furnace body 1 and difficulty in effectively discharging the large amount of volatile organic compounds generated during the sintering process. Figures 1-6 The present invention provides some embodiments to solve the above problems: an atmosphere box-type debinding sintering furnace with a rapid cooling function, comprising a furnace body 1 and a heating mechanism 3 and an air supply mechanism 4 arranged inside the furnace body 1. A furnace cavity 2 is provided inside the furnace body 1, and the heating mechanism 3 is arranged on the top of the furnace cavity 2. The output end of the air supply mechanism 4 is connected to the inner side surface of the furnace body 1, and can be connected to one or more inner side surfaces. The air supply mechanism 4 supplies air from left to right or from right to left after the heating mechanism 3 is started for a predetermined time and forms a hot air circulation in the furnace cavity. A rotatable furnace door 5 is provided at the front end face of the furnace body 1, and a ventilation hole plate 7 is provided on the inner wall of the furnace door 5. An insulation layer 6 is provided behind the ventilation hole 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 hole plate 7. Preferably, a glue oil collector 13 is provided at the bottom of the furnace door 5.

[0026] It is understandable that in the prior art, in order to maintain the high temperature environment required for the sintering process, the sintering box is usually provided with an insulation layer 6 around it to reduce heat loss, improve thermal efficiency, and ensure the stability of the temperature inside the furnace chamber 2. This type of insulation layer 6 is mostly made of thermal insulation materials such as ceramic fiber cotton, aluminum silicate board, and high-temperature resistant foam. It has a large thickness and low thermal conductivity, which can effectively prevent heat from being conducted outward. It is a conventional structural configuration of the high-temperature furnace body 1. To this end, the present invention solves 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 discharge of hot air are realized, the furnace temperature is evenly distributed during the heating stage, and the residual heat is quickly taken away after the heating is stopped, thereby improving the overall heat dissipation efficiency.

[0027] 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. The amount of nitrogen used can be appropriately reduced. If the oxygen in the furnace chamber 2 exceeds the standard, hydrogen needs to be introduced for neutralization. Preferably, a gas detection mechanism is provided in the furnace chamber 2, and an air supply mechanism 4 is used to transport 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 also replenish nitrogen or hydrogen in a timely manner according to the detection data of the gas detection mechanism. For example, in the initial stage of debinding or the heating stage, when the temperature of the furnace chamber 2 reaches about 300°C, only air can be used for preliminary sintering; and when the temperature is further increased to 500°C or above, in order to prevent oxidation reaction or product deterioration, a nitrogen protective atmosphere can be switched. If it is detected that the oxygen concentration exceeds the standard, a certain amount of hydrogen can be injected to react with oxygen for reduction, thereby achieving precise atmosphere control and optimizing sintering quality. After sintering is complete, heating mechanism 3 stops operating, but furnace chamber 2 still retains a relatively high temperature, along with volatile organic compounds released during the binder removal process. To accelerate cooling and effectively remove the remaining gases in furnace chamber 2, air supply mechanism 4 switches its air supply path, sending air from the rear to the front of furnace body 1. The air then passes through ventilation plate 7 located on the inner wall of furnace door 5 and is discharged out of the furnace. Because ventilation plate 7 is located on the inner wall of front furnace door 5 and is backed by insulation layer 6, it effectively receives the high-temperature airflow and guides it evenly, while preventing heat from being directly transferred to the outer surface of furnace door 5, thereby ensuring safe operation.

[0028] During this phase, any volatile organic compounds remaining within the furnace chamber 2 are either discharged from the furnace along with the forward airflow or partially intercepted and condensed onto the surface of the ventilation plate 7. Since the ventilation plate 7 is located on the inner wall of the rotatable furnace door 5, when equipment cleaning and maintenance is required, the furnace door 5 can be opened to directly clean the surface of the ventilation plate 7 without disassembling the furnace body 1 or auxiliary structures. This significantly improves cleaning efficiency and convenience, and prevents carbon accumulation or blockage of volatile compounds that could affect subsequent use.

[0029] The present invention provides an air supply mechanism 4 with switchable wind direction, a ventilation hole plate 7, an insulation layer 6 and an atmosphere adjustment system, so that the temperature field is stable and uniform during the sintering stage, the atmosphere is controllable, and the heat dissipation is fast and efficient during the cooling stage. At the same time, the effective guidance and discharge of volatile substances and convenient cleaning are achieved, which greatly improves the comprehensive performance and industrial adaptability of the atmosphere box-type debinding sintering furnace.

[0030] In some embodiments, a return air duct 8 is formed between the ventilation hole plate 7 and the insulation layer 6, and the return air duct 8 is connected to an exhaust pipe 9 extending to the outside of the furnace body 1, and the exhaust pipe 9 is connected to one or more valves 10 for controlling the amount of gas passing through the exhaust pipe 9. Specifically, ventilation holes 7 are provided on the inner walls of the four sides of the furnace cavity 2, and an insulation layer 6 is provided behind the ventilation holes 7; a gap of a certain width is reserved between the ventilation hole plate 7 and the insulation layer 6, and the gap constitutes an annular return air duct 8 running through the four sides of the furnace cavity 2, and one end or multiple positions of the return air duct 8 are provided with an exhaust pipe 9 connected to the outside of the furnace body 1, and multiple valves 10 for controlling the exhaust flow rate can be provided on the exhaust pipe 9, which are used to adjust the exhaust gas emission efficiency or regulate the flow direction of the gas in the furnace cavity 2.

[0031] The ventilation hole plate 7 is provided with a number of evenly distributed through holes or air outlet slots. Under the driving action of 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 duct. Since the ventilation hole plate 7 isolates the insulation layer 6 from the furnace cavity 2 space 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, thereby extending its service life.

[0032] When a large amount of high-temperature exhaust gas, glue oil vapor, microparticles, and other volatile by-products are generated during the sintering or debinding process, these gases can be effectively guided into the return air duct 8 and promptly discharged 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, to further purify the gas before discharge.

[0033] Through the closed return air channel formed between the ventilation hole plate 7 and the insulation layer 6, the high-temperature gas and volatile organic compounds generated in the furnace chamber 2 can be quickly guided to the external exhaust system to avoid gas retention in the furnace chamber 2, thereby improving the exhaust efficiency during the debinding and sintering process; the existence of the return air duct 8 facilitates the formation of a directional airflow path, which helps to maintain the dynamic balance of the atmosphere in the furnace chamber 2. In conjunction with the gas detection mechanism and the control valve 10, the concentration of nitrogen, oxygen, hydrogen, etc. can also be accurately adjusted according to real-time detection data, thereby improving the consistency and controllability of the sintering quality; when sintering is completed and enters the cooling stage, the return air duct 8 cooperates with the exhaust system to serve as a forced heat conduction path, accelerates the discharge process of hot air in the furnace chamber 2, breaks through the barrier effect of the traditional insulation layer 6 on heat dissipation, significantly shortens the cooling time, and improves the production rhythm.

[0034] Since the hot air flow no longer directly acts on the surface of the insulation layer 6, but is guided into the return air duct 8 through the ventilation hole plate 7, the thermal shock and pollution of the high-temperature gas on the insulation material are reduced, its aging and structural degradation are delayed, and the maintenance frequency and cost are reduced.

[0035] In some embodiments, in order to meet the humidity requirements of a specific debinding or sintering process, a humidifier 11 is further included in some embodiments. The humidifier 11 is connected to the furnace cavity 2 and is used to deliver high-temperature moisture to the furnace cavity 2. The humidifier 11 can be in the form of an electrically heated steam generator, an ultrasonic atomizer, or a high-pressure steam injection system. An independent temperature control heating unit can be provided on the humidifier 11 to ensure that the water vapor reaches the target temperature before being injected into the furnace cavity 2. In order to facilitate the control of the injection amount and time of moisture, the humidifier 11 can be equipped with a corresponding controller. According to the stage requirements of the sintering program, the humidifier 11 can be triggered to turn on / off through program control or gas detection feedback signal to achieve intelligent control of the entire process.

[0036] The heating mechanism 3 includes a heating element 32, a wind wheel 33, and a water-cooled motor 31. The output end of the water-cooled motor 31 is arranged downward and the wind wheel 33 is connected to the output end of the water-cooled motor 31. The heating element 32 is arranged below the wind wheel 33. Specifically, the water-cooled motor 31 is arranged vertically with its rotating shaft facing downward. The wind wheel 33 is coaxially connected to the rotating shaft of the water-cooled motor 31 to achieve rotational drive. A cooling water chamber is provided inside the water-cooled motor 31. The motor is continuously cooled by an external cooling water circulation system to prevent it from thermal attenuation or damage during long-term operation at the top of the high-temperature furnace chamber 2, thereby improving the safety and stability of the system operation. When the wind wheel 33 rotates, a vertical downward high-speed airflow is formed. The airflow first passes through the heating element 32 for heating, and then drives the hot air to flow to the lower part of the furnace cavity 2, prompting the hot air to form a forced heat circulation in the furnace cavity 2, thereby improving the uniformity of temperature distribution in various areas of the furnace cavity 2.

[0037] In some embodiments, in order to enhance the airtightness and safety of the furnace door 5, an electromagnetic lock structure is provided on the furnace door 5, and a snap-fit ​​portion that cooperates with the electromagnetic lock is correspondingly provided on the furnace body 1. The electromagnetic lock can be automatically locked and unlocked under the control of the controller. When the equipment is in a heating or dangerous atmosphere operating state, the electromagnetic lock remains closed to prohibit personnel from accidentally opening the furnace door 5; after the temperature is cooled to a safe temperature or the exhaust is completed, the electromagnetic lock is released by the controller and allowed to be opened.

[0038] In some embodiments, the air supply mechanism 4 further includes an air outlet duct, which is arranged on the side of the ventilation plate 7 of the furnace cavity 2. A plurality of air outlet holes are evenly arranged on the air outlet duct for directing the delivery of atmosphere 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 air flow requirements.

[0039] In some embodiments, a plurality of mutually spaced carrier plates 12 are vertically disposed within the furnace chamber 2. These carrier plates 12 are typically made of high-temperature alloys, stainless steel, or ceramic support plates. Each carrier plate 12 has holes, and each carrier plate 12 can be used to place a product to be processed, such as a ceramic component, electrode sheet, powder compact, etc. The spacing between the carrier plates 12 can be adjusted based on product thickness or airflow distribution requirements, supporting multi-layer stacking heating treatment.

[0040] In some embodiments, considering that nitrogen, hydrogen and other gases will be used in the sintering process and direct discharge will increase gas loss, and the gas in the furnace cavity 2 after sintering will usually contain volatile by-products such as microparticles, in order to take into account the cooling effect, a circle of cooling channels surrounding the furnace cavity 2 can be provided on the outside of the furnace cavity 2, and a separate blower is provided to connect with the cooling channel. The blower continuously delivers gas to take away the heat of the furnace cavity 2 and thus achieve rapid cooling. The above situation can be flexibly adapted according to the usage scenario.

[0041] 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 embodied 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 illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. An atmosphere box type debinding sintering furnace with rapid cooling function, characterized in that: The invention comprises a furnace body and a heating mechanism and an air supply mechanism arranged inside the furnace body, a furnace cavity is provided inside the furnace body, the heating mechanism is arranged at the top of the furnace cavity, the output end of the air supply mechanism is connected to the inner side surface of the furnace body, the air supply mechanism supplies air from left to right or from right to left after the heating mechanism is started for a predetermined time and forms a hot air circulation in the furnace cavity, the furnace body is provided with a rotatable furnace door at the front end face, the inner wall of the furnace door is provided with a ventilation hole plate, and an insulation layer is provided behind the ventilation hole plate, and the air supply mechanism supplies air from back to front when the heating mechanism stops and discharges the air outward after passing through the ventilation hole plate.

2. The atmosphere box type debinding sintering furnace with rapid cooling function according to claim 1, characterized in that: A gas detection mechanism is provided in the furnace cavity, and the air supply mechanism is used to transport 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 hole plate and the thermal 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 is used to deliver high-temperature moisture 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 wind wheel and a water-cooled motor. The output end of the water-cooled motor is arranged downward and the wind wheel is connected to the output end of the water-cooled motor. The heating element is arranged below the wind wheel.

7. The atmosphere box type debinding sintering furnace with rapid cooling function according to claim 1, characterized in that: The furnace door is provided with an electromagnetic lock, and the furnace body is provided with a buckle portion for cooperating with the electromagnetic lock.

8. The atmosphere box type debinding sintering furnace with rapid cooling function according to claim 1, characterized in that: A plurality of carrier plates are arranged at intervals from top to bottom inside the furnace cavity, and the carrier plates are used to carry 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, the air outlet duct is arranged on the side of the ventilation hole plate, and a plurality of air outlet holes are provided on the air outlet duct.

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

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