An annular carburizing furnace which separates furnace cavity functional areas by a partition and a partition wall

Abstract

An annular carburizing furnace is provided with a plurality of partitions and three walls for separating the functional zones of the furnace cavity. The partitions are vertically embedded in the annular rotary bottom between the work stations. The three walls are spaced apart from each other, and one of the walls is located adjacent to the inlet and outlet of the annular furnace body. The annular furnace cavity is sequentially divided into a heating carburizing section, a carburizing diffusion section and a holding cooling section by the three walls, which are connected to the inlet and outlet. The walls have through openings for the partitions and work stations carrying workpieces to pass through. The annular rotary bottom is driven by a rotary bottom driving device to rotate step by step, so that the walls and the partitions moving into the through openings of the walls periodically form an isolation structure, and the heating carburizing section, the carburizing diffusion section and the holding cooling section are periodically connected or isolated. Accordingly, the structure of the annular furnace body can be simplified to reduce operating costs, and the temperature and carbon potential of each functional section are stable and uniform to improve the carburizing quality of the workpieces.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment technology for metal workpieces, and in particular to an annular carburizing furnace that separates the functional areas of the furnace cavity by partitions and partition walls. Background Technology

[0002] Currently, the isolation between different functional zones within the annular furnace cavity of an annular carburizing furnace is achieved through several partition doors located at the top of the annular furnace body, such as... Figure 1 As shown, the partition door mainly consists of a door box A1, a lifting motor A2, a chain storage unit A3, a chain A4, a connecting rod A5, and an isolation door A6. The door box A1 is sealed on the outside of the top of the annular furnace body B1 to house the lifting motor A2, chain storage unit A3, chain A4, connecting rod A5, and the isolation door A6 for upward retraction. The top of the annular furnace body B1 also has a lower opening corresponding to the door box A1, which provides a raising and lowering channel B2 for the isolation door A6. The isolation door A6 is connected to one end of the chain A4 via the connecting rod A5. The other end of the chain A4 is located in the chain storage unit A3. The lifting motor A2 is located on the outside of the door box A1, and its drive end is connected to the chain storage unit A3 inside the door box A1. The lifting motor A2 drives the chain storage unit A3 to raise and lower the chain A4, thereby driving the connecting rod A5 and the isolation door A6 to rise or fall, thus allowing the isolation door A6 to isolate or connect the various functional areas of the annular furnace cavity B3. In addition, since the carburizing environment in the annular furnace cavity B3 is interconnected, that is, the carburizing process gas is injected into the entire annular furnace cavity B3 and flows and distributes between the functional zones, the descent of the isolation door A6 does not seal and isolate the functional zones. This isolation is a relative isolation state, which mainly isolates the process temperature of each functional zone. In actual operation, in order to avoid impact damage to the annular rotating bottom B4 after the isolation door A6 is lowered, a safety gap of at least 5mm is usually required between the lower edge of the isolation door A6 and the upper side of the annular rotating bottom B4.

[0003] However, the high-temperature environment inside the annular furnace chamber B3 and the precipitated carbon black are highly destructive to the connecting rod A5 and chain A4 that connect to the isolation door A6. The high-temperature environment causes the connecting rod A5 and chain A4 to deform due to heat and accelerate metal fatigue, while the carbon black will deposit on the surface of the above components, causing severe corrosion. As a result, the annular carburizing furnace has to be shut down for maintenance every few months to replace the corroded chain A4, connecting rod A5 and other components. This leads to the long-term high operating and maintenance costs of the annular carburizing furnace, and the shutdown maintenance will also seriously affect the heat treatment efficiency of the workpiece.

[0004] Therefore, how to avoid the adverse effects of the high-temperature environment inside the annular furnace cavity and the precipitated carbon black on the partition doors, and reduce the operation and maintenance costs of the annular carburizing furnace, has become one of the technical problems that urgently need to be solved in this field. Utility Model Content

[0005] The technical problem to be solved by this solution is how to avoid the adverse effects of the high-temperature environment and precipitated carbon black in the annular furnace cavity on the partition doors, reduce the operation and maintenance costs of the annular carburizing furnace, and improve the heat treatment efficiency of the workpiece.

[0006] To address the aforementioned technical problems, this technical solution provides an annular carburizing furnace that separates the functional areas of the furnace cavity using partitions and walls. The furnace includes an annular furnace body, a rotating bottom drive device, several partitions, and three walls. The annular furnace body has an annular furnace cavity inside. The outer wall of the annular furnace body has inlet and outlet ports communicating with the annular furnace cavity. The bottom of the annular furnace cavity is equipped with a circumferentially rotating annular bottom. Several workstations are evenly distributed on the upper side of the annular bottom. The lower part of the annular bottom is driven by the rotating bottom drive device, which drives the annular bottom to rotate in a step-like circumferential manner. The surfaces of the partitions are vertical and extend radially along the annular furnace body. The upper side of the annular rotating bottom is embedded and fixed between the several workstations. The three partition walls are set in the annular furnace cavity at intervals, with one partition wall located near the inlet and outlet. The annular furnace cavity is sequentially divided by the three partition walls into a heating and carburizing section, a carburizing diffusion section, and a heat preservation and cooling section that connects the inlet and outlet. The partition walls have through openings for the partition plates and workstations carrying workpieces to pass through. The annular rotating bottom is driven by a rotating bottom drive device to rotate and move in a step-by-step manner so that the three partition walls and the partition plates that move into their through openings periodically form an isolation structure, thereby periodically connecting or isolating the heating and carburizing section, the carburizing diffusion section, and the heat preservation and cooling section in the annular furnace cavity. Accordingly, the annular carburizing furnace of this technical solution abandons the use of partition doors as a means of isolating the functional sections within the annular furnace cavity. Instead, it adopts a method of setting three partition walls within the annular furnace cavity and embedding several partitions between several workstations on the annular rotating bottom. The rotating bottom is driven to rotate and move in a step-by-step manner by a rotating bottom drive device, so that each partition wall and the partition that moves into its through-hole form a relative isolation structure. This makes the heating carburizing section, the carburizing diffusion section, and the heat preservation and cooling section relatively isolated, thereby effectively preventing crosstalk between different process temperatures in the above-mentioned functional sections. Because the annular carburizing furnace of this technical solution eliminates the need for partition doors, there is no need to create a loading and unloading channel in the top wall of the annular furnace cavity that communicates with the door boxes of the partition doors. This greatly simplifies the structure of the annular furnace body, reduces manufacturing and maintenance costs, and also reduces the spatial height of the annular carburizing furnace. In addition, since the partition walls and baffles are not metal components such as connecting rods or chains, frequent furnace shutdowns for maintenance are not required, thus extending the maintenance cycle of the annular carburizing furnace and improving the heat treatment efficiency of the workpiece. Furthermore, since baffles are embedded on the front and rear sides of each station, the space in which each station is located is relatively enclosed, reducing disturbances from other stations or functional areas. This makes the temperature and carbon potential in the space in which the station is located more stable and uniform, thereby improving the carburizing quality of the workpiece.

[0007] In another implementation of this technical solution, the partition wall consists of two wall piers and a door arch. The two wall piers are fixedly installed on both sides of the annular furnace cavity, spaced apart and facing each other. The door arch is fixedly installed on the top side of the annular furnace cavity and connected to the upper part of the two wall piers. The two wall piers, the door arch, and the upper side of the annular bottom enclose a through opening, and the area of ​​the through opening is smaller than the area of ​​the longitudinal cross-section of the annular furnace cavity. Accordingly, the partition wall physically separates the annular furnace cavity.

[0008] In another implementation of this technical solution, the wall piers, arches, and furnace cavity walls of the annular furnace are all constructed by laying multiple fireproof bricks inside the shell of the annular furnace body, and the fireproof brick structures constituting the wall piers and arches protrude beyond the fireproof brick structures constituting the furnace cavity walls. Therefore, the partition wall structure can be manufactured using only the ordinary process of laying fireproof bricks, thereby reducing the difficulty of the manufacturing process.

[0009] As another implementation of this technical solution, the shape of the partition plate is the same as that of the through opening, and the area of ​​the partition plate is smaller than that of the through opening. When the partition plate moves into the through opening, there are narrow gaps between the two side edges and the top edge of the partition plate and the corresponding two wall piers and arches. Accordingly, the partition wall and the partition plate form a relative isolation structure, which not only allows the carburizing process gas to flow between the functional sections in the annular furnace cavity, but also effectively blocks the crosstalk between different process temperatures between the functional sections.

[0010] As another implementation of this technical solution, an annular groove is provided at the bottom of the annular furnace cavity, and an annular rotating bottom is embedded in the annular groove. The bottom of the annular rotating bottom has an annular seat protruding downwards from the annular furnace body. The lower part of the annular seat has an annular bearing. The inner or outer annular surface of the annular bearing has teeth. The rotating bottom driving device includes at least one drive motor. The output end of the drive motor is connected to a drive gear plate through a reducer. The teeth on the drive gear plate mesh with the teeth of the annular bearing, so that the drive motor drives the annular bearing and drives the annular rotating bottom to rotate circumferentially. Accordingly, the drive motor drives the annular rotating bottom to rotate circumferentially through the transmission structure.

[0011] As another implementation of this technical solution, the rotating bottom drive device also includes several radio frequency (RF) storage magnetic sheets and at least one read / write station. The RF storage magnetic sheets are mounted on an annular base, and their installation positions correspond one-to-one with the positions of several workstations on the upper side of the annular rotating bottom. The at least one read / write station is located below the annular furnace body and is electrically connected to the drive motor via a switch control unit. The read / write station can identify the RF signals on the RF storage magnetic sheets, enabling the switch control unit to control the turn-off and start-up times of the drive motor. This facilitates step-by-step operation control of the partitions on the annular rotating bottom, and the RF signals read by the read / write station also allow for real-time monitoring of the relative isolation of each functional section.

[0012] As another implementation of this technical solution, the radio frequency storage magnetic sheet is an NFC card, the read / write station is an NFC card reader, and the switch control unit is a programmable logic controller.

[0013] As another implementation of this technical solution, several high-temperature resistant circulating fans are evenly installed on the top of the annular furnace cavity. Several heating elements are distributed in the heating and carburizing zone, the carburizing diffusion zone, and the heat preservation and cooling zone. The density of heating elements in the heating and carburizing zone is greater than that in the carburizing diffusion zone, which in turn is greater than that in the heat preservation and cooling zone. Therefore, the high-temperature resistant circulating fans allow for a more uniform distribution of carbon potential and process temperature within the annular furnace cavity; and the varying densities of the heating elements meet the temperature requirements of each functional zone.

[0014] As another implementation of this technical solution, the partition is made of a silicon carbide plate. This makes the partition both heat-resistant and resistant to carbon black corrosion.

[0015] In another implementation of this technical solution, the workstation is constructed by several refractory rods spaced evenly and parallel to the radial direction of the annular furnace body on the upper side of the annular rotating bottom. This facilitates the loading and unloading of workpieces. Attached Figure Description

[0016] Figure 1 A longitudinal sectional view of the portion of an annular carburizing furnace equipped with partition doors in the prior art; Figure 2 This is a top-view, transverse sectional view of the annular carburizing furnace of this utility model. Figure 3 This is a longitudinal sectional view of the partition wall and partition plate forming an isolation structure in the annular carburizing furnace of this utility model. Figure 4 This is a partial longitudinal sectional view of the partition wall and partition plate forming an isolation structure in the annular carburizing furnace of this utility model from another angle. Figure 5 This is a partial cross-sectional view from a top angle of the partition wall and partition plate forming the isolation structure in the annular carburizing furnace of this utility model. Figure 6 This is a schematic diagram showing the operation of the radio frequency storage magnetic sheet and the read / write station in this utility model.

[0017] Explanation of symbols in the attached diagram: In the prior art: A1 Door box; A2 Lifting motor; A3 Chain reel storage; A4 Chain; A5 Connecting rod; A6 Isolation door; B1 Annular furnace body; B2 Loading and unloading channel; B3 Annular furnace cavity; B4 Annular rotating bottom.

[0018] In this utility model: 1. Annular furnace body; 11. Annular furnace cavity; 111. Heating and carburizing zone; 112. Carburizing and diffusion zone; 113. Insulation and cooling zone; 114. Furnace cavity wall; 115. Annular channel; 12. Inlet and outlet; 13. Annular rotating bottom; 131. Station; 132. Annular seat; 133. Annular support; 14. High-temperature resistant circulating fan; 15. Heating element; 2. Baffle; 3. Partition wall; 31. Through opening; 32. Wall pier; 33. Door arch; 41. Radio frequency storage magnetic plate; 42. Read / write station; A. Workpiece. Detailed Implementation

[0019] The detailed description and technical content of this utility model are explained below with reference to the accompanying drawings. However, the accompanying drawings are provided for reference and illustration only and are not intended to limit this utility model.

[0020] In the context of this specification, any two or more embodiments of this utility model can be arbitrarily combined, and the resulting technical solutions are part of the original disclosure of this specification and also fall within the protection scope of this utility model.

[0021] like Figure 2 , 3Figures 4 and 5 show schematic diagrams of a specific embodiment of an annular carburizing furnace according to the present invention, which uses partitions and walls to separate functional areas of the furnace cavity. The annular carburizing furnace (hereinafter referred to as the annular carburizing furnace) of the present invention includes an annular furnace body 1, a rotating bottom driving device, several partitions 2, and three partitions 3. The annular furnace body 1 has an annular furnace cavity 11 inside. The outer wall of the annular furnace body 1 has inlet and outlet ports 12 communicating with the annular furnace cavity 11. The bottom of the annular furnace cavity 11 is equipped with an annular rotating bottom 13 capable of circumferential rotation. Several workstations 131 are evenly and spaced on the upper side of the annular rotating bottom 13. The lower part of the annular rotating bottom 13 is driven and connected to the rotating bottom driving device, which can drive the annular rotating bottom 13 to rotate and move in a step-like manner along the circumference. The surfaces of the several partitions 2 are vertical and embedded and fixed to the several workstations 131 along the radial direction of the annular furnace body 1. The three partition walls 3 are arranged at intervals between each other in the annular furnace cavity 11, with one partition wall 3 located near the inlet / outlet 12. The annular furnace cavity 11 is sequentially divided by the three partition walls 3 into a heating and carburizing zone 111, a carburizing and diffusion zone 112, and a heat preservation and cooling zone 113 that connects to the inlet / outlet 12. The partition wall 3 has a through-hole 31 for the partition plate 2 and the workstation 131 carrying the workpiece A to pass through. The annular rotating bottom 13 is driven to rotate in a stepwise manner by the rotating bottom driving device so that the three partition walls 3 and the partition plate 2 that moves into its through-hole 31 periodically form an isolation structure, thereby periodically connecting or isolating the heating and carburizing zone 111, the carburizing and diffusion zone 112, and the heat preservation and cooling zone 113 in the annular furnace cavity 11. In addition, several high-temperature resistant circulating fans 14 are evenly installed on the top of the annular furnace cavity 11 to make the carbon potential and process temperature distribution in each functional section more uniform. Several heating elements 15 are evenly distributed in the heating and carburizing section 111, the carburizing and diffusion section 112, and the heat preservation and cooling section 113. The heating element density in the heating and carburizing section 111 is greater than that in the carburizing and diffusion section 112, and the heating element density in the carburizing and diffusion section 112 is greater than that in the heat preservation and cooling section 113. This can meet the process temperature requirements of each functional section. The workstation 131 can be formed by several refractory rods arranged in a radial direction parallel to the annular furnace body 1 and evenly spaced on the upper side of the annular rotating bottom 13 to facilitate the loading and unloading of workpiece A.

[0022] In operation, the annular carburizing furnace of this invention uses a workpiece loading mechanism (not shown in the figure) located outside the inlet / outlet 12 to remove the carburized workpiece A from the station 131 on one side of the heating carburizing section 111, directly opposite the inlet / outlet 12. Then, the workpiece A to be carburized is loaded into the empty station 131. Next, the rotating bottom drive device drives the annular rotating bottom 13 to move the station 131, which just had workpiece A loaded, one station distance to the other side of the heating carburizing section 111. During this station movement, the through openings 31 of the three partition walls 3 allow the station 131 carrying workpiece A to pass through, thus allowing the heating carburizing section 111 and the carburizing diffusion section to pass through. The heating and carburizing section 111, the carburizing diffusion section 112, and the heat preservation and cooling section 113 are connected. When the annular rotating bottom 13 stops rotating in a step-by-step manner, that is, when the inlet and outlet 12 moves out of the subsequent station 131 and the workpiece A to be carburized is loaded, the through opening 31 of the three partition walls 3 forms an isolation structure with the partition 2 that moves into it, so that the heating and carburizing section 111, the carburizing diffusion section 112, and the heat preservation and cooling section 113 are isolated from each other. Thus, with the step-by-step rotation of the annular rotating bottom 13, the loading and unloading operation of workpiece A, the connection and isolation operation between the functional sections, and the heating, carburizing diffusion and heat preservation and cooling operation of workpiece A are carried out simultaneously.

[0023] Specifically, the partition wall 3 is composed of two wall piers 32 and a door arch 33. The two wall piers 32 are fixedly installed on both sides of the annular furnace cavity 11, spaced apart from each other. The door arch 33 is fixedly installed on the top side of the annular furnace cavity 11 and is connected to the upper part of the two wall piers 32. The two wall piers 32, the door arch 33 and the upper side of the annular bottom 13 form a through opening 31. The area of ​​the through opening 31 is smaller than the area of ​​the longitudinal section of the annular furnace cavity 11, so that the partition wall 3 forms a physical separation of the annular furnace cavity 11.

[0024] Furthermore, the wall pier 32, the archway 33, and the furnace cavity wall 114 of the annular furnace cavity 11 are all constructed by laying multiple fireproof bricks on the inner side of the shell of the annular furnace body 1. The fireproof brick structures constituting the wall pier 32 and the archway 33 protrude from the fireproof brick structures constituting the furnace cavity wall 114. Therefore, the partition wall structure can be manufactured using only the ordinary process of laying fireproof bricks, reducing the difficulty and cost of the manufacturing process. In addition, the partition 2 can be made of silicon carbide material, so that the partition 2 is both heat-resistant and will not be damaged by carbon black corrosion. The shape of the partition plate 2 is the same as that of the through opening 31, and the area of ​​the partition plate 2 is smaller than that of the through opening 31. The area of ​​the longitudinal section of the workstation 131 carrying workpiece A is smaller than that of the partition plate 2. When the partition plate 2 moves into the through opening 31, there are narrow gaps between the two side edges and the upper side edge of the partition plate 2 and the corresponding two wall piers 32 and door arches 33. This makes the partition wall 3 and the partition plate 2 form a relative isolation structure, which not only allows the carburizing process gas to flow between the functional sections in the annular furnace cavity 11, but also effectively blocks the crosstalk between different process temperatures between the functional sections.

[0025] In the specific embodiments of this utility model, combined with Figure 6 As shown, the bottom of the annular furnace cavity 11 is provided with an annular channel 115, and the annular rotating bottom 13 is embedded in the annular channel 115. The bottom of the annular rotating bottom 13 has an annular seat 132 that protrudes downward outside the annular furnace body 1. The lower part of the annular seat 132 has an annular bearing 133. The inner or outer annular surface of the annular bearing 133 has teeth (not shown in the figure). The rotating bottom driving device includes at least one drive motor (not shown in the figure). The output end of the drive motor is connected to a drive gear plate (not shown in the figure) through a reducer. The teeth on the drive gear plate mesh with the teeth of the annular bearing 133 so that the drive motor drives the annular bearing 133 and drives the annular rotating bottom 13 to rotate circumferentially. In order to achieve step-by-step operation control of the partition 2 on the annular rotating bottom 13, the rotating bottom drive device also includes several radio frequency storage magnetic sheets 41 and at least one read / write station 42. The several radio frequency storage magnetic sheets 41 are installed on the annular seat 132, and the installation positions of the several radio frequency storage magnetic sheets 41 correspond one-to-one with the positions of the several workstations 131 on the upper side of the annular rotating bottom 13. The at least one read / write station 42 is located below the annular furnace body 1, and the read / write station 42 is electrically connected to the drive motor through a switch control unit (not shown in the figure). The read / write station 42 can identify the radio frequency signals on the radio frequency storage magnetic sheets 41 so that the switch control unit can control the shutdown and start-up time of the drive motor. The radio frequency storage magnetic sheet 41 can be an NFC card, the read / write station 42 can be an NFC card reader, and the switch control unit can be a programmable logic controller. Thus, the relative isolation of each functional section can be understood in real time through the radio frequency signals read by the read / write station 42.

[0026] In summary, the annular carburizing furnace of this invention abandons the use of partition doors as a means of isolating the functional sections within the annular furnace cavity. Instead, it employs three partition walls within the annular furnace cavity and several partitions embedded between several workstations on the annular rotating bottom. By using a rotating bottom drive device to drive the annular rotating bottom in a stepwise manner, each partition wall and the partition that moves into its through-hole form a relative isolation structure. This ensures that the heating carburizing section, the carburizing diffusion section, and the heat preservation and cooling section are relatively isolated, thereby effectively preventing crosstalk between different process temperatures in the aforementioned functional sections. Because the annular carburizing furnace of this invention eliminates the need for partition doors, there is no need to create a passageway in the top wall of the annular furnace cavity that connects to the door box of the partition door. This greatly simplifies the structure of the annular furnace, reduces manufacturing and maintenance costs, lowers operational safety hazards, and reduces the spatial height of the annular carburizing furnace. In addition, since the partition walls and baffles are not metal components such as connecting rods or chains, frequent furnace shutdowns for maintenance are unnecessary, thus extending the maintenance cycle of the annular carburizing furnace and improving the heat treatment efficiency of the workpiece. Furthermore, since baffles are embedded on the front and rear sides of each station, the space of each station is relatively enclosed, reducing disturbances from other stations or functional areas. This makes the temperature and carbon potential within the space of the station more stable and uniform, thereby improving the carburizing quality of the workpiece.

[0027] The above are merely preferred embodiments of the present utility model and are not intended to limit the patent scope of the present utility model. Other equivalent changes made using the patent concept of the present utility model should all fall within the patent protection scope of the present utility model.

Claims

1. An annular carburizing furnace with functional zones of the furnace cavity separated by partitions and walls, comprising: The annular furnace body and rotating bottom driving device are described. The annular furnace body has an annular furnace cavity inside. The outer wall of the annular furnace body has inlet and outlet ports communicating with the annular furnace cavity. The bottom of the annular furnace cavity is equipped with a circumferentially rotatable annular rotating bottom. Several workstations are evenly distributed on the upper side of the annular rotating bottom. The lower part of the annular rotating bottom is driven by the rotating bottom driving device, which drives the annular rotating bottom to rotate and move in a step-like manner along the circumference. The annular carburizing furnace further includes several partitions and three partition walls. The surfaces of the partitions are vertical and embedded and fixed between the several workstations along the radial direction of the annular furnace body. On the upper side of the rotating bottom, the three partition walls are spaced apart from each other and arranged in the annular furnace cavity, with one partition wall located near the inlet and outlet. The annular furnace cavity is sequentially divided by the three partition walls into a heating and carburizing section, a carburizing diffusion section, and a heat preservation and cooling section that connects to the inlet and outlet. The partition walls have through openings for the partition plates and the workstations carrying the workpieces to pass through. The rotating bottom is driven by the rotating bottom drive device to rotate and move in a step-by-step manner so that the three partition walls and the partition plates that move into their through openings periodically form an isolation structure, thereby periodically connecting or isolating the heating and carburizing section, the carburizing diffusion section, and the heat preservation and cooling section in the annular furnace cavity.

2. The annular carburizing furnace according to claim 1, characterized in that, The partition wall consists of two wall piers and a door arch. The two wall piers are fixedly installed on both sides of the annular furnace cavity, spaced apart from each other. The door arch is fixedly installed on the top side of the annular furnace cavity and is connected to the upper part of the two wall piers. The two wall piers, the door arch and the upper side of the annular bottom enclose the through opening, and the area of ​​the through opening is smaller than the area of ​​the longitudinal section of the annular furnace cavity.

3. The annular carburizing furnace according to claim 2, characterized in that, The wall piers, arches, and furnace cavity walls of the annular furnace are all constructed by building multiple fireproof bricks on the inner side of the shell of the annular furnace body, and the fireproof brick structures constituting the wall piers and arches protrude from the fireproof brick structures constituting the furnace cavity walls.

4. The annular carburizing furnace according to claim 2, characterized in that, The shape of the partition is the same as that of the through opening, and the area of ​​the partition is smaller than that of the through opening. When the partition moves into the through opening, there are narrow gaps between the two side edges and the top edge of the partition and the corresponding two wall piers and arches.

5. The annular carburizing furnace according to claim 1, characterized in that, The bottom of the annular furnace cavity is provided with an annular channel, and the annular rotating bottom is embedded in the annular channel. The bottom of the annular rotating bottom has an annular seat that protrudes downward from the annular furnace body. The lower part of the annular seat has an annular bearing. The inner or outer annular surface of the annular bearing has teeth. The rotating bottom driving device includes at least one drive motor. The output end of the drive motor is connected to a drive gear disk through a reducer. The teeth on the drive gear disk mesh with the teeth of the annular bearing so that the drive motor drives the annular bearing and drives the annular rotating bottom to rotate circumferentially.

6. The annular carburizing furnace according to claim 5, characterized in that, The rotating bottom drive device also includes several radio frequency storage magnetic sheets and at least one read / write station. The several radio frequency storage magnetic sheets are mounted on the annular base, and the installation positions of the several radio frequency storage magnetic sheets correspond one-to-one with the positions of the several workstations on the upper side of the annular rotating bottom. The at least one read / write station is located below the annular furnace body. The read / write station is electrically connected to the drive motor through a switch control unit. The read / write station can identify the radio frequency signals on the radio frequency storage magnetic sheets so that the switch control unit can control the shutdown and startup times of the drive motor.

7. The annular carburizing furnace according to claim 6, characterized in that, The radio frequency storage magnetic sheet is an NFC card, the read / write station is an NFC card reader, and the switch control unit is a programmable logic controller.

8. The annular carburizing furnace according to claim 1, characterized in that, The top of the annular furnace cavity is uniformly equipped with several high-temperature resistant circulating fans, and the heating and carburizing zone, the carburizing diffusion zone, and the heat preservation and cooling zone are all equipped with several heating elements. The heating element density in the heating and carburizing zone is greater than that in the carburizing diffusion zone, and the heating element density in the carburizing diffusion zone is greater than that in the heat preservation and cooling zone.

9. The annular carburizing furnace according to claim 1, characterized in that, The partition is made of silicon carbide sheet material.

10. The annular carburizing furnace according to claim 1, characterized in that, The workstation is formed by several refractory rods arranged at intervals and evenly on the upper side of the annular rotating bottom, parallel to the radial direction of the annular furnace body.

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