Low-pressure carburizing vacuum furnace heating chamber with partition temperature control function

Abstract

The utility model relates to the technical field of zoned temperature control heating, and discloses a low-pressure carburizing vacuum furnace heating chamber with zoned temperature control, which comprises a vacuum furnace which has heat conductivity and is provided with a vacuumizing module, and further comprises a plurality of heating bins which are annularly and uniformly arranged, and the vacuum furnace is arranged in one of the heating bins; the rotary bin changing structure comprises a rotary disc and a C-shaped circular track which are connected through a connecting rod. The turntable is rotationally arranged in the center of all the heating bins, and the C-shaped circular track is rotationally arranged at the tops of all the heating bins; the vacuum furnace is connected with the C-shaped circular track; every two adjacent heating bins are connected through the corresponding automatic partition structure, and after the rotary table rotates, the vacuum furnaces pass through the corresponding automatic partition structures and are transferred into the adjacent heating bins; a nitrogen tank and an acetylene tank; and the two are arranged on the turntable and are respectively connected with the vacuum furnace through gas conveying pipes. Compared with the prior art, the temperature control device has the advantages that the temperature of each heating bin can be independently adjusted and controlled, so that the partitioned temperature control is realized.

Description

Technical Field

[0001] This utility model relates to the field of zoned temperature control heating technology, specifically to a heating chamber of a low-pressure carburizing vacuum furnace with zoned temperature control. Background Technology

[0002] A low-pressure carburizing vacuum furnace is a high-temperature device that performs carburizing in a vacuum environment, primarily used for surface strengthening of metal parts. It involves heating, raising the temperature, preheating, and homogenizing in a vacuum to remove oxides and grease from the workpiece surface, activating the surface and facilitating carburizing. After carburizing, carburizing gas is introduced, then removed to achieve a working vacuum. Carburizing and diffusion processes are then repeated several times in a pulsed alternation until the desired carburized layer depth is reached.

[0003] However, existing low-pressure carburizing vacuum furnaces typically only have one heating chamber. In order to prevent uneven heating of the workpiece and ensure that the temperature inside the heating chamber is uniform and stable, it is often necessary to heat and cool it for a long time. This makes it impossible to achieve zoned temperature control, rapid processing of workpieces at different temperatures to achieve efficient heat treatment, and due to the special metallic properties, the processing capacity is limited and the heat treatment efficiency is low. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned technical difficulties and provide a heating chamber of a low-pressure carburizing vacuum furnace with zoned temperature control. The heating chamber includes multiple heating chambers arranged in succession, and the temperature in each heating chamber is different. The vacuum furnace can be moved between each heating chamber and the internal workpiece can be processed using the corresponding temperature, thereby quickly realizing the adjustment of the heating temperature.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A heating chamber for a low-pressure carburizing vacuum furnace with zoned temperature control includes a vacuum furnace, which is thermally conductive and equipped with a vacuum pumping module, and further includes:

[0007] The heating chambers are arranged evenly in a ring, and the vacuum furnace is located in one of the heating chambers.

[0008] The rotating chamber-changing structure includes a turntable and a C-shaped ring rail connected by a connecting rod; the turntable is rotatably positioned in the center of all heating chambers, and the C-shaped ring rail is rotatably positioned on top of all heating chambers; the vacuum furnace is connected to the C-shaped ring rail;

[0009] The automatic partition structure connects two adjacent heating chambers, and after the turntable rotates, the vacuum furnace moves to the adjacent heating chamber through the corresponding automatic partition structure.

[0010] Nitrogen and acetylene cylinders are mounted on a turntable and connected to the vacuum furnace via gas supply pipes.

[0011] As an improvement, the automatic partition structure includes a partition chamber connected between two adjacent heating chambers. A pair of switching shafts are rotatably disposed in the partition chamber. Multiple C-shaped slots adapted to the vacuum furnace are evenly arranged circumferentially on its side wall. The two switching shafts cooperate with each other, and heat-resistant sealing gaskets are provided on the side wall. After the heat-resistant sealing gaskets abut against each other, the two heating chambers are separated. After the vacuum furnace moves through the rotating chamber-changing structure, it simultaneously slides with the C-shaped slots of the two switching shafts, drives the two switching shafts to rotate, and passes between the two switching shafts.

[0012] As an improvement, a sealing disc is provided at the bottom of the switching shaft, and a synchronous gear is provided at the bottom of the sealing disc. The synchronous gears of the two switching shafts mesh with each other, and the side walls of the sealing discs of the two switching shafts abut against each other. A sealing plate is provided at the bottom of the heating chamber, and the sealing plate abuts against and seals the side walls of the two sealing discs. The top surface is flush with the top surface of the sealing disc. The vacuum furnace is slidably mounted on the sealing plate and the sealing disc.

[0013] As an improvement, one of the heating chambers is equipped with a loading and unloading port on the top, and a front cover and a rear cover are respectively provided on the front and rear sides of the loading and unloading port. After the front cover and the rear cover are closed, they cooperate with the C-shaped ring rail to seal the heating chamber and prevent heat leakage.

[0014] As an improvement, a U-shaped gas distribution chamber is fixedly fitted to the top of the vacuum furnace. The opening of the U-shaped gas distribution chamber faces upward and is hinged to the inner side with a furnace cover. Multiple gas outlets connected to the vacuum furnace are evenly arranged around the bottom. The top is connected to both ends of a C-shaped ring rail. Gas supply pipes pass through the C-shaped ring rail and connect to the U-shaped gas distribution chamber. Nitrogen and acetylene enter the U-shaped gas distribution chamber through the gas supply pipes and then enter the vacuum furnace evenly through each gas outlet.

[0015] The advantages of this utility model compared with the prior art are as follows:

[0016] 1. This utility model is equipped with multiple heating chambers, and the temperature of each heating chamber can be independently adjusted and controlled, thereby realizing zoned temperature control, making the heat treatment capability of the workpiece more efficient and powerful, and more convenient to use.

[0017] 2. This new type of vacuum furnace can quickly transfer heating chambers through a rotating chamber-changing structure, thereby achieving rapid temperature change treatment of workpieces, making its heat treatment functions richer and more powerful.

[0018] 3. This utility model is equipped with an automatic isolation structure, which can automatically realize the connection and isolation of adjacent heating chambers. This not only ensures the temperature control effect of each heating chamber and prevents mutual interference between heating chambers, but also ensures the transfer capability of the vacuum furnace, realizes rapid temperature change, and makes it more convenient and safe to use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0021] Figure 3 This is a partial structural schematic diagram of the present invention.

[0022] Figure 4 This is a cross-sectional schematic diagram of the automatic partition structure of this utility model.

[0023] Figure 5 This is a schematic diagram of the rotating chamber-changing structure of this utility model.

[0024] Figure 6 This is a cross-sectional schematic diagram of the vacuum furnace of this utility model.

[0025] As shown in the figure: 1. Vacuum furnace; 2. U-shaped gas distribution chamber; 3. Furnace cover; 4. Vacuuming module; 5. Heating chamber; 6. Isolation chamber; 7. Switching shaft; 8. Heat-resistant sealing gasket; 9. Sealing plate; 10. Rotating shaft; 11. Synchronous gear; 12. Sealing disc; 13. Turntable; 14. Nitrogen tank; 15. Acetylene tank; 16. Gas supply pipe; 17. Gear ring; 18. Drive gear; 19. Gearbox; 20. Motor; 21. C-shaped ring rail; 22. Connecting rod; 23. Heater; 24. Front cover; 25. Rear cover; 26. Loading / unloading port. Detailed Implementation

[0026] In the description of this utility model, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0027] The present invention will now be described in further detail with reference to the accompanying drawings.

[0028] A heating chamber for a low-pressure carburizing vacuum furnace with zoned temperature control, such as... Figure 1 As shown, it includes vacuum furnace 1, and also includes:

[0029] Heating chamber 5 and automatic partition structure; such as Figure 2 , Figure 3 , Figure 4 As shown, six heating chambers 5 are evenly arranged in a ring, and adjacent heating chambers 5 are connected by partition chambers 6 with an automatic partition structure. Each heating chamber 5 is equipped with a heater 23 and a temperature sensor. A ring groove is formed on the top of all heating chambers 5 and partition chambers 6, and one of the heating chambers 5 is provided with a loading and unloading port 26 on its top. A front cover 24 is hinged to the front of the loading and unloading port 26, and a rear cover 25 is hinged to the rear (the non-hinged ends of the front cover 24 and the rear cover 25 are respectively located on the inner and outer sides of the ring groove). Both can be opened outwards. The heating chambers 5, partition chambers 6, front cover 24, and rear cover 25 are all made of heat-insulating material to reduce heat leakage. A pair of rotating shafts 10 are vertically installed in the partition chamber 6, and a pair of switching shafts 7 are rotatably mounted on the two rotating shafts 10 respectively. The switching shafts 7 are as follows: Figure 3 As shown, a cylindrical structure with four C-shaped bayonets evenly arranged circumferentially on the side wall is provided. The C-shaped bayonets are adapted to the vacuum furnace 1. A heat-resistant sealing gasket 8 is provided on the side wall of the switching shaft 7. After the two switching shafts 7 are engaged with each other, the heat-resistant sealing gaskets 8 abut against each other or against the inner wall of the corresponding partition chamber 6, thereby forming a seal and isolating the corresponding two heating chambers 5.

[0030] A sealing disc 12 is provided at the bottom of the switching shaft 7, and a synchronous gear 11 is provided at the bottom of the sealing disc 12. The synchronous gears 11 of the two switching shafts 7 mesh with each other, and the side walls of the sealing discs 12 of the two switching shafts 7 abut against each other. A sealing plate 9 is provided at the bottom of the heating chamber 5, and the sealing plate 9 abuts against and seals the side walls of the two sealing discs 12. The top surface is flush with the top surface of the sealing disc 12. The vacuum furnace 1 is arranged in one of the heating chambers 5 and is slidably set on the sealing disc 12 or the sealing plate 9. During the process of the vacuum furnace 1 moving and passing between the two switching shafts 7, the side wall simultaneously slides and engages with the C-shaped bayonet of the two switching shafts 7, and drives the two switching shafts 7 to rotate synchronously in opposite directions, so that the vacuum furnace 1 blocks the gap and reduces the transfer of hot air between the two heating chambers 5.

[0031] Rotary chamber changing structure, such as Figure 5 As shown, the system includes a drive module, a turntable 13 connected by a connecting rod 22, and a C-shaped ring rail 21. The turntable 13 is rotatably positioned in the center of all heating chambers 5, and the C-shaped ring rail 21 is rotatably positioned in the annular groove at the top of all heating chambers 5. The drive module includes a gear ring 17 sleeved and fixed on the turntable 13, and a gearbox 19 and a motor 20 mounted on one side of the turntable 13 via a bracket. The input end of the gearbox 19 is connected to the drive shaft of the motor 20, and the output end is provided with a drive gear 18 that meshes with the gear ring 17.

[0032] Vacuum furnace 1 Figure 6 As shown, it is a circular barrel structure with thermal conductivity, and the top is provided with an upward-extending furnace opening. A U-shaped gas distribution chamber 2 is fitted and fixed on the furnace opening. The opening of the U-shaped gas distribution chamber 2 is set upward, and the inner side is hinged with a furnace cover 3. The top two ends are respectively connected to the two ends of the C-shaped ring rail 21, and the bottom is evenly provided with multiple gas outlets connected to the vacuum furnace 1. The top of the furnace cover 3 is formed with an arc-shaped locking block corresponding to the C-shaped ring rail 21. The arc-shaped locking block is slidably set in the annular groove and clamped between the two ends of the C-shaped ring rail 21. The C-shaped ring rail 21 and the arc-shaped locking block form a complete ring, and are movably sealed with the annular groove, the front cover 24 and the rear cover 25. After the motor 20 is started, the C-shaped ring rail 21 drives the vacuum furnace 1 to rotate along the annular groove, and the furnace cover 3 rotates to the loading and unloading port 26. After the front cover 24 and the rear cover 25 are opened, the furnace cover 3 can be flipped up.

[0033] like Figure 5 As shown, nitrogen tank 14 and acetylene tank 15 are respectively mounted on turntable 13 and are respectively connected to U-shaped gas distribution chamber 2 of vacuum furnace 1 through gas supply pipe 16 (the two gas supply pipes 16 are respectively equipped with solenoid valves and pass through C-shaped ring rail 21 to connect with U-shaped gas distribution chamber 2). The vacuum pump of vacuum module 4 is mounted on C-shaped ring rail 21 and the gas extraction pipe passes through U-shaped gas distribution chamber 2 to connect with the inner cavity of vacuum furnace 1. Through vacuum module 4, the gas in vacuum furnace 1 is extracted to form a vacuum. Nitrogen and acetylene in nitrogen tank 14 and acetylene tank 15 enter U-shaped gas distribution chamber 2 through corresponding gas supply pipe 16 and then enter vacuum furnace 1 evenly through each gas outlet for high-temperature carburizing and gas pressure regulation.

[0034] In the specific implementation of this embodiment:

[0035] After rotating the vacuum furnace 1 to the loading / unloading port 26, open the front cover 24 and the rear cover 25, then open the furnace cover 3, and place the workpiece to be processed into the vacuum furnace 1. After closing the furnace cover 3, close the front cover 24 and the rear cover 25, and check the seal. Use the vacuum module 4 to extract the gas from the vacuum furnace 1 to create a vacuum environment. Start the heaters 23 in each heating chamber 5 to heat and stabilize the temperature in each heating chamber 5 to different set values ​​(the heating chamber 5 with the loading / unloading port 26 can be used as a cooling chamber and loading / unloading chamber without heating), thereby achieving different temperatures. With zoned control of the degree, the motor 20 is started, and the vacuum furnace 1 rotates along the annular groove under the drive of the rotary chamber switching structure. During the process of passing between the two switching shafts 7, the side wall simultaneously slides and engages with the C-shaped bayonet of the two switching shafts 7, and drives the two switching shafts 7 to rotate synchronously in opposite directions. At the same time, the vacuum furnace 1 blocks the gap, reducing the transfer of hot air between the two heating chambers 5. By transferring between heating chambers 5 at different temperatures, the ambient temperature of the processing is quickly adjusted, and the internal workpiece is processed at different temperatures, achieving rapid, uniform and stable vacuum heating and cooling.

[0036] During the vacuum heating process, nitrogen and acetylene are pulsed into the U-shaped gas distribution chamber 2 by controlling the solenoid valve of the gas supply pipe 16. They are then evenly distributed into the vacuum furnace 1 through the U-shaped gas distribution chamber 2 and come into contact with the workpiece surface at high temperature to complete the high-temperature low-pressure carburizing operation (the role of nitrogen is mainly to regulate pressure and prevent oxidation). The reaction gas is then extracted by the vacuum module 4. The above steps are repeated continuously in a pulsed manner to thicken the carburized layer on the workpiece surface.

[0037] After low-pressure carburizing is completed, start motor 20 to rotate vacuum furnace 1 to loading and unloading port 26 for cooling. After complete cooling, open front cover 24, rear cover 25 and furnace cover 3 to remove the workpiece.

[0038] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A low-pressure carburizing vacuum furnace heating chamber with zoning temperature control, comprising a vacuum furnace (1) having thermal conductivity, provided with a vacuum pumping module (4), characterized in that, Also include: Heating bin (5), along the annular uniform arrangement of multiple, vacuum furnace (1) is arranged in one of the heating bin (5) inside; Rotary bin structure, including the rotary disc (13) and C type loop rail (21) connected by connecting rod (22); Rotary disc (13) is rotationally arranged in the middle of all heating bin (5), and C type loop rail (21) is rotationally arranged on the top of all heating bin (5); Vacuum furnace (1) is connected with C type loop rail (21); Automatic isolation structure, between the adjacent two heating bin (5) is connected through automatic isolation structure, and after the rotation of rotary disc (13), vacuum furnace (1) passes through the corresponding automatic isolation structure, and is transferred to the adjacent heating bin (5) inside; Nitrogen tank (14), acetylene tank (15); Both are arranged on the rotary disc (13), and are connected with vacuum furnace (1) through gas pipe (16) respectively.

2. The low-pressure carburizing vacuum furnace heating chamber with partition temperature control according to claim 1, characterized in that: The automatic isolation structure includes isolation bin (6) connected between the adjacent two heating bin (5), a pair of switching shaft (7) is rotationally arranged in the isolation bin (6), and a plurality of C type sockets matched with vacuum furnace (1) are uniformly arranged on the side wall thereof in the circumferential direction, the two switching shaft (7) are matched with each other after rotation, the two heating bin (5) between them are isolated, and after the movement of vacuum furnace (1) through rotary bin structure, the C type sockets of the two switching shaft (7) are slidably matched, the two switching shaft (7) are rotated, and the two switching shaft (7) are passed through.

3. The low-pressure carburizing vacuum furnace heating chamber with partition temperature control according to claim 2, characterized in that: The bottom of switching shaft (7) is provided with sealing disc (12), the bottom of sealing disc (12) is provided with synchronous gear (11), the synchronous gears (11) of the two switching shaft (7) are engaged, the side walls of the sealing discs (12) of the two switching shaft (7) abut, the bottom of heating bin (5) is provided with sealing plate (9), and the side walls of the two sealing discs (12) abut and seal with the sealing plate (9), and the top surface is flush with the top surface of sealing disc (12).

4. The low-pressure carburizing vacuum furnace heating chamber with partition temperature control according to claim 2, characterized in that: The side wall of the switching shaft (7) is provided with heat-resistant sealing pad (8).

5. The low-pressure carburizing vacuum furnace heating chamber with temperature control by zones according to claim 2, characterized in that: One of the heating bin (5) is provided with loading and unloading opening (26), and the front and rear sides of the loading and unloading opening (26) are respectively provided with front cover (24) and rear cover (25), the front cover (24) and the rear cover (25) are closed, and the heating bin (5) is closed in cooperation with C type loop rail (21).

6. The low-pressure carburizing vacuum furnace heating chamber with partition temperature control according to claim 2, characterized in that: The top of the vacuum furnace (1) is fixed with U type gas distribution bin (2), the opening of the U type gas distribution bin (2) is upwardly arranged and the inner side is hingedly connected with furnace cover (3), and the bottom is uniformly provided with a plurality of gas outlets connected with vacuum furnace (1) in the circumferential direction, the top is connected with the two ends of C type loop rail (21) respectively, and the gas pipe (16) passes through C type loop rail (21) and is connected with U type gas distribution bin (2).

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