Large rotary type bell jar furnace

Abstract

The invention relates to the technical field of sintering furnaces, and discloses a large rotary type bell jar furnace which comprises a supporting structure, a furnace body, a closed ring, a heating assembly, a control assembly, a furnace cover, a driving mechanism and the like. The interior of the furnace chamber is divided into a plurality of temperature zones, heating control is carried out through corresponding heating assemblies and temperature sensors, heating devices in different temperature zones are distributed unevenly, the corresponding temperature zones are accurately adjusted in cooperation with a control system, the influence of heat loss caused by spatial distance is reduced, and the service life of the furnace chamber is prolonged. And the whole temperature field is more uniform. The closed ring on the furnace body is matched with the butt joint groove filled with the heat-resistant particles on the furnace cover to form a labyrinth sealing structure, dynamic rotary sealing of the position of the furnace cover is achieved, internal and external heat exchange is isolated, and heat loss of the furnace cavity at the position of the furnace opening is reduced. A plurality of air outlet holes communicated with an air source are formed in the inner wall of the position of the furnace mouth, an air curtain can be formed through the air outlet holes to isolate internal and external heat exchange, and heat loss of the position of the furnace mouth is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sintering furnaces, and in particular to a large rotary bell furnace. Background Art

[0002] The rotary bell furnace is an important equipment used for high-temperature processing in the industrial field. It is widely used in new materials fields such as capacitors, electronic ceramics, and powder metallurgy. Among them, large rotary bell furnaces are often used for high-precision sintering of semiconductor oxide ceramics and heat treatment and sintering processes of ceramic materials and products in the aerospace field. Especially when used for sintering large hood-type structure parts in the aerospace field, how to ensure the processing quality is a major problem. First, because the large furnace body has a large space, there is heat loss, and second, there is the possibility of heat loss at the opening of the furnace body. The above reasons will lead to poor uniformity of the temperature field inside the furnace cavity, and ultimately lead to insufficient product processing quality. Summary of the invention

[0003] The technical problem solved by the present invention is: how to ensure the uniformity of the temperature field in the furnace cavity inside a large rotary bell furnace.

[0004] The purpose of the present invention can be achieved through the following technical solutions: A large rotary bell furnace, comprising: Support structure; A furnace body, wherein the furnace body is fixedly connected to the supporting structure, a furnace cavity is formed inside the furnace body, a plurality of temperature zones are formed inside the furnace cavity, a furnace opening communicating with the furnace cavity is formed at the end of the furnace body, a plurality of air outlets are formed on the inner wall at the position of the furnace opening, and the air outlets are communicated with an air source through an air flow channel; A closed ring, which is located outside the furnace mouth and fixedly connected to the furnace body, and is a ring-shaped structure formed by a plate-like member; A plurality of groups of heating components, the heating components are used to heat the furnace cavity, and each temperature zone is provided with a group of heating components; A control component, the control component is used to detect the temperature of each temperature zone respectively and control the working efficiency of the corresponding heating component; A furnace cover, the furnace cover comprises a cover body and a plug body of an integrated structure, the size of the cover body is larger than the size of the furnace cavity, the size of the plug body is consistent with the size of the furnace mouth, the cover body is provided with a docking groove at a position corresponding to the closed ring, and the docking groove is filled with particles of heat-resistant material; A driving mechanism is used to drive the furnace cover to move.

[0005] In one solution of the present invention, a smoke exhaust port is provided on one end of the furnace body away from the furnace opening, and the smoke exhaust port is communicated with the purification component.

[0006] In one embodiment of the present invention, a hot air component is disposed at one end of the furnace body close to the furnace opening, and the hot air component includes a heating source and a hot air channel. One end of the hot air channel is connected to the heating source, and the other end is connected to the furnace cavity.

[0007] In one solution of the present invention: the outlet end of the hot air channel is arranged obliquely, and the outlet of the hot air channel points to the middle position direction of the furnace cavity.

[0008] In one embodiment of the present invention, an annular channel communicating with the air outlet and the air flow channel is provided in the furnace body, and the annular channel is located between the hot air channel and the cover body.

[0009] In one embodiment of the present invention, a support member is provided at a central position in the furnace cavity.

[0010] In one embodiment of the present invention, a heating element is provided at a central position in the furnace cavity.

[0011] In one embodiment of the present invention: a plurality of support blocks are fixedly provided at one end of the plug body away from the cover body, a support plate is laid at one end of the support block away from the plug body, and the height position of the outlet end of the hot air channel is located at the connection position between the support block and the plug body.

[0012] In one solution of the present invention: a limiting portion made of a flexible material is fixedly connected to the cover body, and a docking groove is formed between the limiting portion and the main body of the cover body.

[0013] In one embodiment of the present invention, the driving mechanism includes a lifting driving assembly and a rotating driving assembly.

[0014] A large rotary bell furnace according to the present invention has at least one of the following technical effects: (1) The distribution of heating devices on the upper, middle and lower heating surfaces in the furnace temperature field is uneven. The uneven arrangement cooperates with the control system to accurately adjust the corresponding temperature zones respectively, reducing the impact of heat loss and making the entire temperature field more uniform. At the same time, the separate control of a temperature zone near the furnace mouth can compensate for the heat loss at the furnace mouth, ensuring the uniformity of the entire temperature field.

[0015] (2) The hot air channel is set up to heat by convection. Convection heating is mainly used for preheating or low temperature. Convection and (silicon carbon rod) radiation are coupled at medium temperature, and radiation heating is mainly used at high temperature. The temperature field coupling heating method can maintain good temperature field uniformity from low temperature to high temperature.

[0016] (3) The closed ring on the furnace body and the docking groove on the furnace cover filled with heat-resistant particles cooperate to form a labyrinth sealing structure, which realizes dynamic rotary sealing at the furnace cover position, isolates the internal and external heat exchange, and reduces the heat loss of the furnace cavity at the furnace mouth position.

[0017] (4) A number of air outlets connected to the air source are provided on the inner wall at the furnace mouth. An air curtain can be formed through the air outlets. The dynamic air curtain is used to isolate the internal and external heat exchange and reduce the heat loss at the furnace mouth. At the same time, part of the air flow blown out of the air outlet is diverted upward, which can prevent the hot air in the furnace cavity from flowing downward and eventually causing the heat to be lost through the gap at the furnace mouth.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings. Obviously, the drawings in the following description 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 work. Among them: Figure 1 It is a schematic diagram of the overall structure of the present invention from one viewing angle; Figure 2 It is a schematic diagram of the structure of the furnace body and the furnace cover of the present invention; Figure 3 The present invention Figure 2 A schematic diagram of the structure with a partial enlargement at the center; Figure 4 The present invention Figure 2 A schematic diagram of the structure with a partial enlargement at B in the middle; Figure 5 It is a schematic diagram of the overall structure of the present invention from another perspective; Figure 6 It is a schematic diagram of the overall structure of the present invention from a top view; Figure 7 It is a schematic diagram of the structure of the furnace body and the furnace cover of the present invention; Figure 8 It is a structural schematic diagram of the furnace cover part of the present invention.

[0020] The illustrations in the figure are marked as follows: 1. Support structure; 2. Furnace body; 3. Furnace cover; 4. Closing ring; 5. Heating assembly; 6. Cover body; 7. Plug body; 8. Docking groove; 9. Smoke exhaust port; 10. Purification assembly; 11. Hot air assembly; 12. Hot air channel; 13. Annular channel; 14. Support member; 15. Support block; 16. Support plate; 17. Limiting part; 18. Cross beam; 19. Thermocouple; 20. Air outlet. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0024] When the bell-shaped furnace is used for product processing, in order to ensure the quality of product processing, the temperature field inside it requires uniform temperature, especially when it is used to process large integrated structural parts, such as large hood-shaped parts in the aerospace field, which have higher requirements for temperature field uniformity. In actual production, due to the different distances from the heat source during heating, there is a problem of heat loss, which is prone to uneven temperature field, especially for large rotary bell-shaped furnaces, which will aggravate the uneven temperature field due to the large internal furnace cavity space. For example, the heating zone size of a certain model of bell-shaped furnace is 1200mm in diameter and 2000mm in height. At the same time, since the opening of the furnace body 2 and the furnace cover 3 are dynamically matched, there is a possibility of heat loss, which further increases the difficulty of ensuring uniform temperature field. In order to solve the above problems, the present application provides a large rotary bell-shaped furnace, the furnace cavity is divided into multiple temperature zones along its extension direction, and each temperature zone is provided with a corresponding heating assembly 5 and a temperature sensor for independent heating and temperature control, so that the temperature field in the upper and lower areas of the furnace can ensure uniformity of ±5°C. At the same time, a closed ring 4 is set at the position where the furnace mouth and the furnace cover 3 cooperate as a rotating dynamic sealing structure, and an air outlet 20 connected to the air flow channel is further set to form an air curtain (air curtain), thereby ensuring the dynamic sealing effect of the furnace mouth position, reducing heat loss, and ultimately ensuring the uniformity of the entire temperature field.

[0025] See also Figure 1-8 The present invention is a large rotary bell furnace, comprising a support structure 1, a furnace body 2, a closed ring 4, a heating component 5, a control component, a furnace cover 3 and a driving mechanism, etc. Among them, the support structure 1 is used to support and fix the furnace body 2. The support structure 1 can be a bell-shaped steel structure frame, including an upper and lower frame combination. The upper frame is a sturdy double-layer furnace shell structure, the inner shell is used to fix the entire furnace and the upper cover, and the circular structure is mainly used to support and fix the thermal structure (furnace body 2); the middle layer has multiple fans for heat conduction to ensure that the surface temperature of the outer shell is low. The main structure of the lower frame is a steel frame, which serves as a support for the upper frame and a fixation for the lifting platform. The support structure 1 can also include an inspection platform, an inspection escalator, and a handrail, etc., to facilitate inspection work.

[0026] See also Figure 1-7 In one embodiment of the present invention, the furnace body 2 is fixedly connected to the support structure 1, and the furnace body 2 may include an outer shell, an outer lining, an inner lining, and a refractory material arranged in the outer shell, etc. The refractory material (i.e., thermal insulation material) may be Isolite AL 2 O 3 Multi-layer insulation of ceramic fiber module 1600. The furnace is too heavy and is easily deformed when lifted for a long time. High-strength anchors (the anchors can be ceramic nails) can be embedded in the furnace before assembly to ensure that the furnace does not sink or deform after long-term use. The outer layer is insulated with fiberboard to ensure that the furnace does not leak heat.

[0027] See also Figure 1-7 In one embodiment of the present invention, a furnace cavity is provided inside the furnace body 2, and the furnace cavity can extend in a columnar structure in the up-down direction. As an example, the furnace cavity can be a cylindrical structure. The furnace cavity is divided into a plurality of temperature zones along the extension direction, and a transverse beam 18 can be arranged radially inside the furnace body 2, and the inner end of the transverse beam 18 can be arranged to slightly protrude from the inner wall of the furnace body 2. The transverse beam 18 is arranged to ensure the strength of the furnace body 2 while achieving the division of temperature zones. As an example, the furnace cavity can be divided into three temperature zones from top to bottom.

[0028] See also Figure 1-7In one embodiment of the present invention, a furnace port connected to the furnace cavity is provided at the lower end of the furnace body 2, and the furnace port is used for feeding and discharging, etc., and is closed by a furnace cover 3 when in use. A smoke exhaust port 9 is provided at one end of the furnace body 2 away from the furnace port for discharging smoke or harmful gases generated during the processing, and can also be used for exhausting and adjusting the pressure inside the furnace cavity. In this embodiment, the smoke exhaust port 9 is arranged at the center of the upper end of the furnace body 2. The smoke exhaust port 9 can be connected to a purification structure or a purification component 10 through a pipeline structure, and the smoke is discharged after being purified by the purification component 10. The purification structure can be a tail gas rotary furnace, which absorbs organic matter in the furnace through the tail gas rotary furnace, effectively filters and absorbs micron-sized particles, organic components and their decomposition products, and then performs high-temperature rotation treatment, and finally the exhaust gas meets the local environmental protection standards. The smoke exhaust port 9 can be provided with a gas collecting hood, which can be made of heat-resistant material and can be set as a multi-layer structure, including an outer lining, a thermal insulation layer, a fireproof board, etc. The side of the gas collecting hood is provided with an opening which is connected to the purification component 10 through a pipeline to achieve the purification of the exhaust gas.

[0029] See also Figure 1-7 In one embodiment of the present invention, the heating assembly 5 is used to heat the furnace cavity. The heating assembly 5 can be set to multiple groups, and each temperature zone is respectively provided with a group of heating assemblies 5; the corresponding temperature zones are heated by multiple groups of heating assemblies 5, and are independently controlled to avoid heat loss due to distance problems, and to achieve uniform control of the temperature field inside the furnace cavity. The heating assembly 5 includes a heating element, and the heating element can be a heating rod (high-temperature silicon carbon rod), and the silicon carbon rod can include a U-shaped and / or L-shaped structure. Among them, the top temperature zone can use a U-shaped silicon carbon rod and be fixed on the top of the furnace body 2, and the middle temperature zone and the bottom temperature zone can use an L-shaped silicon carbon rod, which is fixedly installed on the side wall of the furnace, which is convenient for installation and maintenance and replacement. The heating assembly 5 can also include a support brick and a plug brick, and the support brick is fixedly arranged in the shell, and a mounting hole corresponding to the heating element is opened in the support brick. A plug brick can be set at the outer end of the support brick to ensure the stability of the heating element.

[0030] See also Figure 1-7 In one embodiment of the present invention, the control component is used to detect the temperature of each temperature zone respectively and control the working efficiency of the corresponding heating component 5; the control component may include a control module and a thermocouple 19, and the number of the thermocouples 19 is multiple and they are respectively arranged in the corresponding temperature zones. The temperature information of the corresponding temperature zone is collected by each thermocouple 19, and then the corresponding heating component 5 is controlled by the control module. By setting multiple temperatures and each temperature zone is independently controlled, the heat loss is reduced and the uniformity of the temperature field is ensured. At the same time, the independent temperature control of a temperature zone close to the furnace mouth can also compensate for the temperature deviation caused by the furnace mouth.

[0031] See also Figure 1-7 In one embodiment of the present invention, a hot air component 11 is provided at one end of the furnace body 2 near the furnace mouth, and the hot air component 11 includes a heating source and a hot air channel 12. One end of the hot air channel 12 is connected to the heating source, and the other end is connected to the furnace cavity. The heating source can be used to heat the airflow, and then the heated airflow is sent into the furnace cavity through the hot air channel 12, which can preheat the furnace cavity and heat it to low-temperature sintering. A temperature sensor is provided at the inlet end of the hot air channel 12 (or the middle of the hot air channel 12 or the outlet end of the heating source), and the temperature sensor is connected to the control module. The existing hot air temperature control method is to set a sensor in the temperature field and control it by feedback. The temperature change has hysteresis, which is easy to cause the fluctuation of the temperature field. In this embodiment, by setting a temperature sensor at the inlet end of the hot air channel 12, the power of the heating source is adjusted based on the collected temperature data, and the temperature of the hot air entering the furnace cavity is regulated so that the temperature of the hot air entering is consistent with the target temperature of the temperature field, thereby ensuring the uniformity and timeliness of the temperature field and reducing the fluctuation of the temperature field. The hot air channel 12 can be used as a heat source for preheating the furnace cavity and low temperature treatment. The outlet end of the hot air channel 12 can be tilted, and the outlet of the hot air channel 12 points to the middle position of the furnace cavity, so that the hot air can flow into the furnace cavity to the maximum extent.

[0032] See also Figure 1-8In one embodiment of the present invention, the closed ring 4 is fixedly connected to the furnace body 2, and the closed ring 4 is a ring-shaped structure formed by the plate-like parts enclosing the outside of the furnace mouth; the furnace cover 3 may include a cover body 6 and a plug body 7 of an integral structure, the size of the cover body 6 is larger than the size of the furnace cavity, the size of the plug body 7 is consistent with the size of the furnace mouth, and a docking groove 8 is provided at a position corresponding to the closed ring 4 on the cover body 6, and the docking groove 8 is arranged in a ring shape around the center of the cover body 6. The docking groove 8 may be filled with particles of heat-resistant material (the maximum working temperature in the furnace cavity is 1400°C, and the granular filler is outside the furnace cavity, and the temperature is relatively low after being isolated by the furnace cover, and the heat resistance requirement is relatively low. In actual use, it is preferred to use a material that can withstand a higher temperature, such as a material that can withstand at least 300°C without significant change); as an example, the particles may be quartz sand or alumina sand laid at the bottom of the groove. When in use, the plug body 7 of the furnace cover 3 is inserted into the furnace mouth to close the furnace mouth. At this time, the lower end of the closing ring 4 is inserted into the docking groove 8. The closing ring 4 and the docking groove 8 provided with granular fillers together form a furnace mouth labyrinth sealing structure, which realizes the dynamic rotary sealing of the furnace cover 3 position, isolates the internal and external heat exchange, and reduces the heat loss of the furnace cavity at the furnace mouth position. The cover body 6 can be fixedly connected with a limiting part 17 of a flexible heat-resistant material, and a docking groove 8 is formed between the limiting part 17 and the main body of the cover body 6. In this way, when the furnace cover 3 is docked with the furnace body 2, the flexible limiting part 17 is located on the outside of the closing ring 4, which can be more closely attached to the closing ring 4, thereby enhancing the dynamic sealing effect of the closing ring 4 structure.

[0033] See also Figure 7-8 In one embodiment of the present invention, the furnace cover 3 is used to close the furnace mouth and can also be used as a loading platform for carrying materials. The furnace cover 3 can be made of corundum mullite material, and its excellent thermal conductivity, wear resistance, corrosion resistance, and high strength ensure that the support plate 16 will not deform or break during long-term use and has a long service life. A plurality of support blocks 15 are fixedly provided at one end of the plug body 7 away from the cover body 6, and a plurality of support plates 16 can be laid at one end of the support block 15 away from the plug body 7 to form a placement layer, and the height position of the outlet end of the hot air channel 12 is located at the connection position between the support block 15 and the plug body 7. In this way, the hot air blown out of the hot air channel 12 can enter under the support plate 16 (i.e., under the material), and then disperse to affect the entire temperature field, thereby ensuring the uniformity of the temperature field.

[0034] See also Figure 1-4In one embodiment of the present invention, a plurality of air outlet holes 20 are provided on the inner wall at the furnace mouth position, and the plurality of air outlet holes 20 can be evenly distributed along the circumference of the inner wall at the furnace mouth position, and the air outlet holes 20 are connected to the gas source through the air flow channel; the outlet of the air outlet holes 20 is toward the position of the plug body 7, and can be toward the middle position of the plug body 7. The air flow channel can include a hole provided inside the furnace body 2 and a pipe located outside the furnace body 2. The gas source can be a gas that does not affect the sintering of the material in the furnace, such as some inert gas. When in use, a small amount of gas is fed into the air flow channel through the gas source, and then the gas is ejected through the air outlet holes 20 to form an air curtain (air curtain) intersecting the gap between the inner wall of the furnace mouth and the plug body 7, and the dynamic air curtain isolates the internal and external heat exchange, thereby reducing the heat loss at the furnace mouth position. Further, an annular channel 13 connected to the air outlet holes 20 and the air flow channel is provided in the furnace body 2, and the annular channel 13 is located between the hot air channel 12 and the cover body 6. The annular channel 13 ensures that the airflow can be quickly distributed to a plurality of air outlet holes 20 for blowing out.

[0035] See also Figure 1-2 In one embodiment of the present invention, a support member 14 may be provided at the center of the furnace chamber, and the support member 14 may be fixedly connected to the cover body 6, so that it can support and stabilize the workpiece when processing large cover parts. A heating element may be provided at the center of the furnace chamber, and the arrangement of the heating element is consistent with the extension direction of the furnace chamber. In this way, when processing large parts, the inside and outside can be heated together to ensure that the temperature inside and outside is consistent. When processing small workpieces, several workpieces can be stacked around the center and heated together inside and outside to ensure heating efficiency and uniformity of temperature field.

[0036] See also Figure 1-8 In one embodiment of the present invention, the driving mechanism is used to drive the furnace cover 3 to move. The driving mechanism includes a lifting drive assembly and a rotation drive assembly. The furnace cover 3 can be set on a base, and the lifting drive assembly is used to drive the base to rise and fall. The lifting drive assembly can be a screw drive structure, a hydraulic drive structure or other similar linear power mechanisms. The rotation drive assembly is used to drive the furnace cover 3 to rotate. The furnace cover 3 can be rotatably connected to the base, and the furnace cover 3 can be directly driven to rotate by a rotating motor, or a rotating gear disk can be provided for intermediate transmission. During the entire sintering process, the furnace cover 3 is driven by the rotating drive assembly to drive the product thereon to rotate at a uniform speed to ensure that the material is sintered more evenly. The rotation speed of the furnace cover 3 can be 0.1~0.5rpm.

[0037] Working principle of the present invention: When in use, first control the furnace cover 3 to be in the lowest position, and ensure that the upper support plate 16 is used as the placement layer. Then transfer the material to be processed to the furnace cover 3 (loading platform) by a transfer trolley such as a hydraulic trolley. Then drive the furnace cover 3 to rise to a high position by the driving mechanism. At this time, the plug body 7 is inserted in the furnace mouth, and the closed ring 4 is inserted in the docking groove 8 to form a labyrinth sealing structure. Then the equipment can be started for heating and temperature rise. The heating process can use the hot air channel 12 to introduce hot air into the furnace cavity, and preheating is carried out by thermal convection. In the low-temperature debinding stage, the hot air of the hot air channel 12 can also be used as the main heating measure. The airflow heated by the heating source is passed into the furnace cavity through the outlet of the hot air channel 12. Since the outlet of the hot air channel 12 is inclined and located at the side and lower position of the placement layer, the hot air flow will be passed to the bottom of the material to the greatest extent, and then dispersed to heat up the entire temperature field, and at the same time, it can better take away the smoke generated during the product debinding process. The exhaust smoke rises and is discharged through the exhaust port 9. At medium temperature, convection and radiation are coupled with each other, and at high temperature, radiation heating is the main method. The entire temperature control process will also be synchronously servo-followed to ensure the temperature accuracy of low-temperature convection heating. After sintering is completed, the temperature can be quickly cooled or naturally cooled through the vents set at the bottom, and then the furnace cover 3 is opened and lowered to remove the product. After the equipment is started and during the entire processing process, the furnace cover 3 is driven by the driving mechanism to rotate at a constant speed, thereby driving the product on it to rotate, ensuring that the material is sintered more evenly. At the same time as the equipment is started, a small amount of airflow is sent to the air outlet 20 through the air source, and the airflow forms an air curtain to separate the inside and the outside. When the airflow blows onto the plug body 7, part of the airflow flows upward, and is preheated in the upward process and merges with the airflow blown out of the hot air channel 12 to flow upward, effectively reducing heat loss. Part of the airflow flows downward to the docking groove 8 and the closed ring 4 position.

[0038] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A large rotary bell furnace, characterized in that: include: Support structure (1); A furnace body (2), the furnace body (2) being fixedly connected to the support structure (1), a furnace cavity being provided inside the furnace body (2), the furnace cavity being divided into a plurality of temperature zones, a furnace opening communicating with the furnace cavity being provided at the end of the furnace body (2), a plurality of air outlet holes (20) being provided on the inner wall at the position of the furnace opening, the air outlet holes (20) being communicated with an air source via an air flow channel; A closed ring (4), the closed ring (4) being located outside the furnace opening and fixedly connected to the furnace body (2), the closed ring (4) being an annular structure formed by enclosing a plate-like member; A plurality of groups of heating components (5), wherein the heating components (5) are used to heat the furnace cavity, and each temperature zone is provided with a group of heating components (5); A control component, the control component is used to detect the temperature of each temperature zone respectively and control the working efficiency of the corresponding heating component (5); A furnace cover (3), the furnace cover (3) comprising a cover body (6) and a plug body (7) of an integral structure, the size of the cover body (6) being larger than the size of the furnace cavity, the size of the plug body (7) being consistent with the size of the furnace opening, the cover body (6) being provided with a docking groove (8) at a position corresponding to the closed ring (4), the docking groove (8) being filled with particles of a heat-resistant material; A driving mechanism, the driving mechanism is used to drive the furnace cover (3) to move.

2. A large rotary bell furnace according to claim 1, characterized in that: A smoke exhaust port (9) is provided on one end of the furnace body (2) away from the furnace opening, and the smoke exhaust port (9) is in communication with a purification component (10).

3. A large rotary bell furnace according to claim 2, characterized in that: A hot air component (11) is provided at one end of the furnace body (2) close to the furnace opening, the hot air component (11) comprising a heating source and a hot air channel (12), one end of the hot air channel (12) being connected to the heating source and the other end being in communication with the furnace cavity.

4. A large rotary bell furnace according to claim 3, characterized in that: The outlet end of the hot air channel (12) is arranged at an angle, and the outlet of the hot air channel (12) points in the direction of the middle of the furnace cavity.

5. A large rotary bell furnace according to claim 4, characterized in that: An annular channel (13) communicating with the air outlet (20) and the air flow channel is provided in the furnace body (2); the annular channel (13) is located between the hot air channel (12) and the cover body (6).

6. A large rotary bell furnace according to claim 1, characterized in that: A support member (14) is provided at a central position in the furnace cavity.

7. A large rotary bell furnace according to claim 1, characterized in that: A heating element is arranged at the center of the furnace cavity.

8. A large rotary bell furnace according to claim 3, characterized in that: A plurality of support blocks (15) are fixedly provided at one end of the plug body (7) away from the cover body (6), a support plate (16) is provided at one end of the support block (15) away from the plug body (7), and the height position of the outlet end of the hot air channel (12) is located at the connection position between the support block (15) and the plug body (7).

9. A large rotary bell furnace according to claim 1, characterized in that: A limiting portion (17) made of a flexible material is fixedly connected to the cover body (6), and a docking groove (8) is formed between the limiting portion (17) and the main body of the cover body (6).

10. A large rotary bell furnace according to claim 1, characterized in that: The driving mechanism comprises a lifting driving component and a rotating driving component.

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