Vacuum low-pressure composite heat treatment device

Abstract

The invention relates to a vacuum low-pressure composite heat treatment device, and relates to the technical field of metal part machining, the vacuum low-pressure composite heat treatment device comprises a base, the upper surface of the base is fixedly connected with a vacuum furnace body, the left side of the vacuum furnace body is provided with a vacuum assembly, and the right side of the vacuum furnace body is provided with a low-pressure gas circulation assembly; a scattering assembly is arranged in the vacuum furnace body, and a rotating assembly is arranged in the vacuum furnace body. By designing the vacuum assembly, the external pressure of a workpiece is reduced, the internal pressure of the workpiece is increased, and therefore the low-pressure carburizing efficiency is improved, mixed gas is introduced, activated carbon atoms generated through acetylene decomposition are accelerated to diffuse under low pressure, nitrogen inhibits carbon black generation, and carbon black is not prone to being formed on the surface of the workpiece; the inner gas particles are impacted and ejected to the surface of the workpiece, the gas flow rate in the low-pressure environment is increased, the permeation speed is increased, meanwhile, the workpiece is rotated, and uniform permeation of the workpiece in the complex shape is achieved.

Description

Technical Field

[0001] This invention relates to the field of metal parts processing technology, and in particular to a vacuum low-pressure composite heat treatment device. Background Technology

[0002] Heat treatment of metal parts, as a core process for improving their mechanical properties, plays a decisive role in product quality and service life. Currently, the mainstream technologies of vacuum heat treatment, low-pressure carburizing, and nitriding each have their advantages and applications. Vacuum heat treatment heats metal parts in a low-pressure vacuum environment, effectively preventing metal oxidation and decarburization by isolating oxygen, thus greatly improving the surface quality of the metal parts. It is widely used in high-end fields such as aerospace and mold manufacturing. For example, after treatment, the strength and corrosion resistance of aero-engine blades are significantly enhanced, enabling them to adapt to extreme working conditions. Low-pressure carburizing technology relies on precise control of carbon potential to uniformly diffuse carbon elements into the metal surface to form a hardened layer, significantly improving the wear resistance and fatigue strength of metal parts. It is often used in the treatment of automotive gearbox gears, which can improve tooth surface hardness, optimize transmission efficiency, and extend service life. Nitriding technology diffuses nitrogen atoms into the metal surface to generate a nitride layer with high hardness and strong chemical stability. It performs excellently in precision machine tool parts and high-speed cutting tools. The surface hardness of nitrided tools can reach HV1000. These mainstream technologies, which significantly improve cutting performance and reduce wear, play a key role in various industries due to their unique properties. Furthermore, they are continuously optimized and upgraded with technological advancements, continuously empowering the improvement of metal material performance and driving the manufacturing industry towards higher levels.

[0003] According to the public announcement (CN202410022792.6), a heating device for carbonitriding is disclosed. This technology includes an outer shell, a processing area within the outer shell, a feeding area connected to the processing area, and a discharging area connected to the processing area. The feeding area has a feeding component, and the processing area is partially divided into zones. A transport component includes a silicon nitride track within the processing area and processing components mounted on the silicon nitride track. The carbonitriding process is performed on the workpiece within the same furnace chamber. The material tray slides smoothly on the silicon nitride track. The workpiece is placed in the material frame, preventing material loss. There are no blind spots in the carbonitriding layer, resulting in a more uniform carbonitriding structure. The bottom support of the furnace is equipped with a silicon nitride track throughout, ensuring durability and a long service life. The partition walls inside the furnace divide the furnace into four separate zones, allowing for separate control of different carbon potential requirements in different zones.

[0004] The heat treatment method adopted in the above technical solution is carried out under normal pressure. Although it can achieve rapid carburization, it requires frequent gas replenishment. Impurities in the furnace can easily cause roughness of the workpiece surface and carbon black to form on the workpiece surface. The uniformity of carburization layer is poor for complex-shaped workpieces. In addition, the equipment is complex and costly. Furthermore, if vacuum heat treatment is adopted, carburization requires additional gas to be introduced. Moreover, a single heat treatment technology cannot achieve high carburization rate and no oxidation at the same time. The cycle is as long as 8-12 hours, which is inefficient and energy-intensive.

[0005] To address the aforementioned problems, this application proposes a vacuum low-pressure composite heat treatment device. Summary of the Invention

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a vacuum low-pressure composite heat treatment device, which solves the problems of easy carbon black formation on the workpiece surface and low efficiency.

[0007] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a vacuum low-pressure composite heat treatment device, comprising a base, a vacuum furnace body fixedly connected to the upper surface of the base, a vacuum assembly disposed on the left side of the vacuum furnace body, and a low-pressure gas circulation assembly disposed on the right side of the vacuum furnace body. The vacuum assembly includes a vacuum pump and a suction pipe. The upper surface of the base is fixedly connected to the vacuum pump, the input end of the vacuum pump is fixedly connected to the suction pipe, and the end of the suction pipe away from the vacuum pump is connected to the interior of the vacuum furnace body. A heating assembly is disposed on the top inner wall of the vacuum furnace body, the heating assembly including a heat-conducting plate and a molybdenum wire heating element, the molybdenum wire heating element being located inside the heat-conducting plate. The vacuum furnace body is equipped with a dispersing component, which includes a baffle fan, a rotating shaft, a disc, and an eccentric roller. The inside of the baffle fan is fixedly connected to the rotating shaft, the end of the rotating shaft away from the baffle fan is fixedly connected to the disc, and the side surface of the disc is fixedly connected to the eccentric roller. The vacuum furnace body is equipped with a rotating assembly, which includes a threaded sleeve, a reciprocating screw, a limiting plate, and a lifting column. The inside of the threaded sleeve is threadedly connected to the reciprocating screw, the upper end of the reciprocating screw is fixedly connected to the limiting plate, and the side surface of the limiting plate is slidably connected to the lifting column.

[0008] Preferably, a filter element is detachably connected inside the vacuum furnace body, and the air extraction pipe is connected to the filter element.

[0009] By adopting the above technical solution and setting up a filter, the gas drawn into the vacuum furnace by the vacuum pump is filtered, preventing dust from entering the vacuum pump and causing blockage, thus interfering with the normal operation of the vacuum pump.

[0010] Preferably, the low-pressure gas circulation assembly includes a gas mixing chamber, a turbo pump, and a gas delivery pipe. The upper surface of the base is fixedly connected to the gas mixing chamber, the interior of the gas mixing chamber is connected to the turbo pump, the output end of the turbo pump is fixedly connected to the gas delivery pipe, and the end of the gas delivery pipe away from the turbo pump is connected to the vacuum furnace body.

[0011] By adopting the above technical solution, a low-pressure gas circulation component is set up to pump acetylene, nitrogen and other gases mixed in the gas mixing box into the vacuum furnace. The active carbon atoms produced by the decomposition of acetylene diffuse faster under low pressure, nitrogen inhibits the formation of carbon black, and a turbopump is used to maintain dynamic balance.

[0012] Preferably, a limit ring is rotatably connected to the side surface of the lifting column, a connecting rod is fixedly connected to the lower surface of the limit ring, the lower end of the connecting rod is fixedly connected to a threaded sleeve, a motor is fixedly connected to the lower surface of the vacuum furnace body, and the output end of the motor is fixedly connected to a reciprocating screw.

[0013] By adopting the above technical solution, the motor drives the reciprocating screw to rotate, the reciprocating screw drives the limit plate to rotate synchronously, the limit plate drives the lifting column to rotate inside the limit ring, and since the threaded sleeve is provided with reciprocating threads, the reciprocating screw will drive the threaded sleeve to move up and down during the rotation inside the threaded sleeve. The threaded sleeve pushes the connecting rod so that the limit ring pulls the lifting column to move up and down, thereby realizing that the lifting column can also move up and down linearly during the rotation.

[0014] Preferably, a lifting rod is fixedly connected to the side surface of the threaded sleeve, a triangular support rod is fixedly connected to the upper surface of the lifting rod, a limit block is fixedly connected to the upper end of the triangular support rod, a limit groove is provided inside the limit block, the side surface of the eccentric roller is movably connected to the limit groove, a positioning element is fixedly connected to the lower surface of the heat-conducting plate, and the side surface of the rotating shaft is rotatably connected to the positioning element.

[0015] By adopting the above technical solution, the threaded sleeve drives the lifting rod to move up and down reciprocally. The lifting rod drives the triangular support rod, which in turn drives the limiting block to move up and down. Since the eccentric roller is located at the edge of the disc, the limiting block moves up and down through the limiting groove, causing the eccentric roller to pull the disc to rotate around the axis of the rotating shaft. This causes the rotating shaft to drive the turbulence fan to rotate, generating airflow and dispersing the gas inside the vacuum furnace. This causes the gas particles inside to be impacted and ejected to the surface of the workpiece, thereby greatly increasing the gas flow rate in the low-pressure environment and thus increasing the penetration rate.

[0016] Preferably, the inner wall of the vacuum furnace body is provided with symmetrically distributed sliding grooves, the end of the lifting rod is slidably connected to the sliding groove, the interior of the vacuum furnace body is provided with a circular groove, and the end of the eccentric roller away from the disc is slidably connected to the circular groove.

[0017] By adopting the above technical solution, a sliding groove is set to limit the lifting rod, making it easier for it to slide up and down. By using the limiting of the circular groove, the eccentric roller can circle around the circular groove as a trajectory during the process of being pulled by the limiting block, thereby improving the stability of the shaft rotation.

[0018] Preferably, the upper end of the lifting column is provided with a clamping assembly, which includes a clamping plate, a bolt and a nut. The upper surface of the lifting column is movably connected to the clamping plate, the bolt passes through the interior of the clamping plate, and the side surface of the bolt is threadedly connected to the nut.

[0019] By adopting the above technical solution, bolts are passed through the clamping plate and the workpiece, and the nuts are tightened, so that the clamping plate clamps the workpiece and fixes it.

[0020] Preferably, the inner wall of the vacuum furnace body is provided with a sealing assembly, which includes a lower sealing plate, a gate plate and an electric telescopic rod. The side surface of the lower sealing plate is fixedly connected to the vacuum furnace body, the inside of the gate plate is fixedly connected to the electric telescopic rod, and the end of the electric telescopic rod away from the gate plate is fixedly connected to the vacuum furnace body.

[0021] By adopting the above technical solution and utilizing the sealing component, the sealing component can be closed after the workpiece is placed inside the vacuum furnace to achieve a seal, which facilitates subsequent vacuum and low-pressure processing.

[0022] Preferably, a bracket is fixedly connected to the lower surface of the base, and the bracket has multiple through holes inside.

[0023] By adopting the above technical solution, perforations are set inside the bracket to facilitate the installation of the equipment by passing the fasteners through the perforations.

[0024] (III) Beneficial Effects In summary, this application includes at least one of the following beneficial technical effects: 1. A vacuum low-pressure composite heat treatment device, which reduces the external pressure and increases the internal pressure of the workpiece by designing vacuum components, thereby accelerating the efficiency of low-pressure carburizing. Furthermore, by introducing mixed gas, the active carbon atoms generated by the decomposition of acetylene diffuse more rapidly under low pressure, and nitrogen inhibits the formation of carbon black, making it difficult for carbon black to form on the surface of the workpiece.

[0025] 2. A vacuum low-pressure composite heat treatment device, by designing a dispersing component, causes the internal gas particles to be impacted and ejected to the surface of the workpiece, thereby greatly increasing the gas flow rate in the low-pressure environment and thus increasing the penetration rate. At the same time, the rotating component is used to rotate the workpiece to achieve uniform penetration of complex-shaped workpieces, improving the processing quality. Furthermore, the rotating component can be linked with the dispersing component to perform multi-position reciprocating lifting and rotation during rotation, achieving a synchronous linkage effect of dispersing, rotating and lifting the workpiece simultaneously. The device has a high degree of integration, optimizes the processing flow, further improves the uniformity of heating and penetration on the workpiece surface, and greatly improves the processing efficiency of the workpiece. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a partial structural schematic diagram of the present invention; Figure 4 This is a schematic diagram of the limiting block structure of the present invention; Figure 5 This is a schematic diagram of the rotating component structure of the present invention; Figure 6 This is a schematic diagram of the vacuum component structure of the present invention; Figure 7 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle; Figure 8 for Figure 3 Enlarged schematic diagram of the structure at point B.

[0027] Explanation of reference numerals in the attached figures: 1. Base; 2. Vacuum furnace body; 3. Vacuum pump; 4. Evacuation pipe; 5. Filter element; 6. Gas mixing box; 7. Turbine pump; 8. Gas delivery pipe; 9. Baffle fan; 10. Shaft; 11. Disc; 12. Eccentric roller; 13. Threaded sleeve; 14. Reciprocating screw; 15. Limiting plate; 16. Lifting column; 17. Limiting ring; 18. Connecting rod; 19. Motor; 20. Lifting rod; 21. Triangular support rod; 22. Limiting block; 23. Limiting groove; 24. Sliding groove; 25. Circular groove; 26. Heat-conducting plate; 27. Molybdenum wire heating element; 28. Positioning component; 29. ​​Clamping plate; 30. Bolt; 31. Nut; 32. Lower sealing plate; 33. Gate plate; 34. Electric telescopic rod; 35. Bracket; 36. Perforation. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 -Appendix Figure 8 This application will be described in further detail below.

[0029] Example: A vacuum low-pressure composite heat treatment device, referring to... Figure 1 , Figure 2 and Figure 7 The system includes a base 1, a vacuum furnace body 2 fixedly connected to the upper surface of the base 1, a vacuum assembly on the left side of the vacuum furnace body 2, and a low-pressure gas circulation assembly on the right side of the vacuum furnace body 2. The vacuum assembly includes a vacuum pump 3 and a suction pipe 4. The upper surface of the base 1 is fixedly connected to the vacuum pump 3, the input end of the vacuum pump 3 is fixedly connected to the suction pipe 4, and the end of the suction pipe 4 away from the vacuum pump 3 is connected to the interior of the vacuum furnace body 2. A heating assembly is provided on the top inner wall of the vacuum furnace body 2. The heating assembly includes a heat-conducting plate 26 and a molybdenum wire heating element 27, with the molybdenum wire heating element 27 located inside the heat-conducting plate 26.

[0030] The vacuum furnace body 2 is equipped with a dispersing component, which includes a baffle fan 9, a rotating shaft 10, a disc 11 and an eccentric roller 12. The interior of the baffle fan 9 is fixedly connected to the rotating shaft 10, the end of the rotating shaft 10 away from the baffle fan 9 is fixedly connected to the disc 11, and the side surface of the disc 11 is fixedly connected to the eccentric roller 12.

[0031] The vacuum furnace body 2 is equipped with a rotating assembly, which includes a threaded sleeve 13, a reciprocating screw 14, a limiting plate 15, and a lifting column 16. The inside of the threaded sleeve 13 is threadedly connected to the reciprocating screw 14, the upper end of the reciprocating screw 14 is fixedly connected to the limiting plate 15, and the side surface of the limiting plate 15 is slidably connected to the lifting column 16.

[0032] Reference Figure 2 and Figure 6 The vacuum furnace body 2 has a detachable filter element 5 inside, and the suction pipe 4 is connected to the filter element 5. By setting the filter element 5, the gas drawn into the vacuum furnace body 2 by the vacuum pump 3 is filtered, preventing dust from entering the vacuum pump 3 and causing blockage, thereby interfering with the normal operation of the vacuum pump 3.

[0033] Reference Figure 1 and Figure 2 The low-pressure gas circulation assembly includes a gas mixing chamber 6, a turbo pump 7, and a gas delivery pipe 8. The upper surface of the base 1 is fixedly connected to the gas mixing chamber 6. The interior of the gas mixing chamber 6 is connected to the turbo pump 7. The output end of the turbo pump 7 is fixedly connected to the gas delivery pipe 8. The end of the gas delivery pipe 8 away from the turbo pump 7 is connected to the vacuum furnace body 2. By setting up the low-pressure gas circulation assembly, gases such as acetylene and nitrogen mixed in the gas mixing chamber 6 are pumped into the vacuum furnace body 2. The active carbon atoms produced by the decomposition of acetylene diffuse more rapidly under low pressure, nitrogen inhibits the formation of carbon black, and the turbo pump 7 maintains a dynamic balance.

[0034] Reference Figure 2 , Figure 3 and Figure 5A limit ring 17 is rotatably connected to the side surface of the lifting column 16. A connecting rod 18 is fixedly connected to the lower surface of the limit ring 17. The lower end of the connecting rod 18 is fixedly connected to the threaded sleeve 13. A motor 19 is fixedly connected to the lower surface of the vacuum furnace body 2. The output end of the motor 19 is fixedly connected to the reciprocating screw 14. By setting the motor 19, starting the motor 19 drives the reciprocating screw 14 to rotate. The reciprocating screw 14 drives the limit plate 15 to rotate synchronously. The limit plate 15 drives the lifting column 16 to rotate inside the limit ring 17. Since the threaded sleeve 13 is provided with reciprocating threads, the reciprocating screw 14 will drive the threaded sleeve 13 to move up and down during the rotation inside the threaded sleeve 13. The threaded sleeve 13 pushes the connecting rod 18, causing the limit ring 17 to pull the lifting column 16 up and down, thereby realizing that the lifting column 16 can also move up and down linearly during the rotation.

[0035] Reference Figure 3 , Figure 4 and Figure 7 A lifting rod 20 is fixedly connected to the side surface of the threaded sleeve 13. A triangular support rod 21 is fixedly connected to the upper surface of the lifting rod 20. A limit block 22 is fixedly connected to the upper end of the triangular support rod 21. A limit groove 23 is provided inside the limit block 22. The side surface of the eccentric roller 12 is movably connected to the limit groove 23. A positioning element 28 is fixedly connected to the lower surface of the heat-conducting plate 26. The side surface of the rotating shaft 10 is rotatably connected to the positioning element 28. The threaded sleeve 13 drives the lifting rod 20 to move up and down reciprocally. The lifting rod 20 drives the triangular support rod 21. The triangular support rod 21 drives the limit block 22 to move up and down. Since the eccentric roller 12 is located at the edge of the disk 11, the limit block 22 is limited by the limit groove 23 during its up and down movement, causing the eccentric roller 12 to pull the disk 11 to rotate. The rotation of the axis of shaft 10 causes the rotating shaft 10 to drive the turbulence fan 9 to rotate, generating airflow and dispersing the gas inside the vacuum furnace body 2. This causes the gas particles inside to be impacted and ejected to the surface of the workpiece, thereby greatly increasing the gas flow rate in the low-pressure environment and thus increasing the permeation rate. The inner wall of the vacuum furnace body 2 is provided with symmetrically distributed sliding grooves 24. The end of the lifting rod 20 is slidably connected to the sliding groove 24. The interior of the vacuum furnace body 2 is provided with a circular groove 25. The end of the eccentric roller 12 away from the disc 11 is slidably connected to the circular groove 25. By setting the sliding groove 24, the lifting rod 20 is limited, which facilitates its up and down sliding. By using the limitation of the circular groove 25, the eccentric roller 12 is pulled by the limiting block 22 and rotates around the circular groove 25 as the trajectory, thereby improving the stability of the rotation of the rotating shaft 10.

[0036] Reference Figure 1 , Figure 3 and Figure 8The upper end of the lifting column 16 is equipped with a clamping assembly, which includes a clamping plate 29, a bolt 30, and a nut 31. The upper surface of the lifting column 16 is movably connected to the clamping plate 29. The bolt 30 passes through the interior of the clamping plate 29, and the side surface of the bolt 30 is threadedly connected to the nut 31. By using the clamping assembly, the bolt 30 is passed through the clamping plate 29 and the workpiece, and the nut 31 is tightened, so that the clamping plate 29 clamps the workpiece, thereby fixing the workpiece. The inner wall of the vacuum furnace body 2 is equipped with a sealing assembly, which includes a lower sealing plate 32, a gate 33, and an electric telescopic rod 34. The side surface of the sealing plate 32 is fixedly connected to the vacuum furnace body 2. The inside of the gate plate 33 is fixedly connected to the electric telescopic rod 34. The end of the electric telescopic rod 34 away from the gate plate 33 is fixedly connected to the vacuum furnace body 2. By setting the sealing component, the sealing component can be closed after the workpiece is placed inside the vacuum furnace body 2 to achieve sealing, which facilitates the subsequent processing of vacuum low pressure. The lower surface of the base 1 is fixedly connected to the bracket 35. The inside of the bracket 35 is provided with multiple through holes 36. By setting the through holes 36 inside the bracket 35, it is convenient to pass the fixing parts through the through holes 36 to realize the installation of the equipment.

[0037] The implementation principle of this application embodiment is as follows: The electric telescopic rod 34 is activated to open the gate 33, the workpiece is installed on the clamping plate 29, and then the gate 33 is closed to achieve a seal. The vacuum pump 3 is then activated to evacuate the interior of the vacuum furnace 2 to the required vacuum level. The heating assembly is activated to heat the interior of the vacuum furnace 2 to 900°C. A mixed gas is introduced by the turbine pump 7. While the workpiece is being heated inside the vacuum furnace 2, the motor 19 drives the reciprocating screw 14 to rotate. The reciprocating screw 14 drives the limiting plate 15 to rotate synchronously. The limiting plate 15 drives the lifting column 16 to rotate inside the limiting ring 17. Because the threaded sleeve 13 has a reciprocating thread, the reciprocating screw 14, while rotating inside the threaded sleeve 13, causes the threaded sleeve 13 to move up and down. The threaded sleeve 13 pushes the connecting rod 18, causing the limiting ring 17 to pull the lifting column 16 up and down. This allows the lifting column 16 to move linearly up and down during rotation, thereby enabling the workpiece to reciprocate up and down during rotation, resulting in more efficient surface processing. The reciprocating screw 14 rotates uniformly inside the threaded sleeve 13. The threaded sleeve 13 drives the lifting rod 20 to move up and down reciprocally. The lifting rod 20 drives the triangular support rod 21, and the triangular support rod 21 drives the limiting block 22 to move up and down. Since the eccentric roller 12 is located at the edge of the disc 11, the limiting block 22 is limited by the limiting groove 23 during its up and down movement, causing the eccentric roller 12 to pull the disc 11 to rotate around the axis of the rotating shaft 10. During the process of being pulled by the limiting block 22, the eccentric roller 12 also circles around the circular groove 25, causing the rotating shaft 10 to drive the turbulence fan 9 to rotate, generating airflow and dispersing the gas inside the vacuum furnace body 2. This causes the gas particles inside to be impacted and ejected to the surface of the workpiece, thereby greatly increasing the gas flow rate in the low-pressure environment and thus increasing the penetration rate. This achieves the effect of simultaneous dispersing, rotating, and lifting of the workpiece while the rotating component is rotating, resulting in a high degree of equipment integration, optimized processing flow, and greatly improved workpiece processing efficiency.

[0038] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A vacuum low-pressure composite heat treatment device, comprising a base (1), characterized in that: A vacuum furnace body (2) is fixedly connected to the upper surface of the base (1). A vacuum assembly is provided on the left side of the vacuum furnace body (2), and a low-pressure gas circulation assembly is provided on the right side of the vacuum furnace body (2). The vacuum assembly includes a vacuum pump (3) and a suction pipe (4). The upper surface of the base (1) is fixedly connected to the vacuum pump (3). The input end of the vacuum pump (3) is fixedly connected to the suction pipe (4). The end of the suction pipe (4) away from the vacuum pump (3) is connected to the interior of the vacuum furnace body (2). A heating assembly is provided on the top inner wall of the vacuum furnace body (2). The heating assembly includes a heat-conducting plate (26) and a molybdenum wire heating element (27). The molybdenum wire heating element (27) is located inside the heat-conducting plate (26). The vacuum furnace body (2) is equipped with a dispersing component, which includes a baffle fan (9), a rotating shaft (10), a disc (11) and an eccentric roller (12). The interior of the baffle fan (9) is fixedly connected to the rotating shaft (10), and the end of the rotating shaft (10) away from the baffle fan (9) is fixedly connected to the disc (11). The side surface of the disc (11) is fixedly connected to the eccentric roller (12). The vacuum furnace body (2) is equipped with a rotating assembly, which includes a threaded sleeve (13), a reciprocating screw (14), a limiting plate (15), and a lifting column (16). The inside of the threaded sleeve (13) is threadedly connected to the reciprocating screw (14), the upper end of the reciprocating screw (14) is fixedly connected to the limiting plate (15), and the side surface of the limiting plate (15) is slidably connected to the lifting column (16).

2. The vacuum low-pressure composite heat treatment device according to claim 1, characterized in that: The vacuum furnace body (2) is detachably connected to a filter element (5), and the exhaust pipe (4) is connected to the filter element (5).

3. The vacuum low-pressure composite heat treatment device according to claim 1, characterized in that: The low-pressure gas circulation assembly includes a gas mixing box (6), a turbo pump (7), and a gas delivery pipe (8). The upper surface of the base (1) is fixedly connected to the gas mixing box (6). The interior of the gas mixing box (6) is connected to the turbo pump (7). The output end of the turbo pump (7) is fixedly connected to the gas delivery pipe (8). The end of the gas delivery pipe (8) away from the turbo pump (7) is connected to the vacuum furnace body (2).

4. The vacuum low-pressure composite heat treatment device according to claim 1, characterized in that: The side surface of the lifting column (16) is rotatably connected to a limiting ring (17), and the lower surface of the limiting ring (17) is fixedly connected to a connecting rod (18). The lower end of the connecting rod (18) is fixedly connected to a threaded sleeve (13). The lower surface of the vacuum furnace body (2) is fixedly connected to a motor (19), and the output end of the motor (19) is fixedly connected to a reciprocating screw (14).

5. The vacuum low-pressure composite heat treatment device according to claim 4, characterized in that: A lifting rod (20) is fixedly connected to the side surface of the threaded sleeve (13), a triangular support rod (21) is fixedly connected to the upper surface of the lifting rod (20), a limiting block (22) is fixedly connected to the upper end of the triangular support rod (21), a limiting groove (23) is provided inside the limiting block (22), the side surface of the eccentric roller (12) is movably connected to the limiting groove (23), a positioning element (28) is fixedly connected to the lower surface of the heat-conducting plate (26), and the side surface of the rotating shaft (10) is rotatably connected to the positioning element (28).

6. The vacuum low-pressure composite heat treatment device according to claim 1, characterized in that: The inner wall of the vacuum furnace body (2) is provided with symmetrically distributed sliding grooves (24), the end of the lifting rod (20) is slidably connected to the sliding groove (24), the interior of the vacuum furnace body (2) is provided with a circular groove (25), and the end of the eccentric roller (12) away from the disc (11) is slidably connected to the circular groove (25).

7. The vacuum low-pressure composite heat treatment device according to claim 1, characterized in that: The upper end of the lifting column (16) is provided with a clamping assembly, which includes a clamping plate (29), a bolt (30) and a nut (31). The upper surface of the lifting column (16) is movably connected to the clamping plate (29). The bolt (30) passes through the interior of the clamping plate (29), and the side surface of the bolt (30) is threadedly connected to the nut (31).

8. The vacuum low-pressure composite heat treatment device according to claim 1, characterized in that: The inner wall of the vacuum furnace body (2) is provided with a sealing assembly, which includes a lower sealing plate (32), a gate (33) and an electric telescopic rod (34). The side surface of the lower sealing plate (32) is fixedly connected to the vacuum furnace body (2), the interior of the gate (33) is fixedly connected to the electric telescopic rod (34), and the end of the electric telescopic rod (34) away from the gate (33) is fixedly connected to the vacuum furnace body (2).

9. The vacuum low-pressure composite heat treatment device according to claim 1, characterized in that: A bracket (35) is fixedly connected to the lower surface of the base (1), and the bracket (35) has multiple perforations (36) inside.

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