A heat treatment device with controlled atmosphere for pipe fittings and a heat treatment method

Abstract

The present invention discloses a heat treatment device and a heat treatment method for a pipe with a controlled atmosphere, which relates to the field of heat treatment technology, and includes a frame, a motor, a pipe, a high-frequency coil module, an atmosphere ejection module, and a coolant ring module. The present invention uses multiple groups of first clamping arms and second clamping arms to clamp and fix the bottom and top of the pipe from the inside of the pipe, respectively. When the motor rotates forward, it can drive the first reciprocating screw rod, the transmission rod, and the second reciprocating screw rod to rotate, so that the first clamping arm and the second clamping arm can clamp and fix the pipe. When the motor rotates reversely, the pipe can be driven to rotate by the first clamping mechanism and the second clamping mechanism, and the reciprocating threaded rod can be driven to rotate by the transmission mechanism, so that the high-frequency coil module is located outside the pipe and moves axially from bottom to top, and the pipe is subjected to high-frequency heating and quenching operations, thereby ensuring that the spacing between any position of the pipe and the high-frequency coil module is consistent.

Description

Technical Field

[0001] The invention relates to the field of heat treatment technology, in particular to a heat treatment device with controlled atmosphere for pipe fittings and a heat treatment method. Background Art

[0002] Heat treatment is a process of changing the physical and chemical properties of a material by heating and cooling it. Heat treatment can be used to improve the hardness, toughness, corrosion resistance, magnetism and other properties of the material, as well as eliminate internal stress and improve the microstructure of the material. Common heat treatment methods include annealing, normalizing, quenching and tempering. Quenching is the process of rapidly cooling the material to below room temperature to make the material reach extremely high hardness.

[0003] High-frequency coil quenching is a heat treatment method that uses high-frequency current to heat and cool the coil. It is usually used to heat and quench conductor materials, such as metal tubes, wires, bars, etc. The working principle of high-frequency coil quenching is to generate high-frequency current through a high-frequency power supply to convert electrical energy into thermal energy. This high-frequency current will generate eddy currents in the conductor material, causing the conductor material to heat itself. Due to the resistance of the conductor material, the eddy currents are mainly generated on the surface of the conductor, causing the surface temperature to rise. By controlling the frequency and power of the high-frequency power supply, rapid heating of the conductor material can be achieved.

[0004] In the prior art, high-frequency coil quenching is often used for pipe fittings. The bottom of the pipe fitting is often directly fixed on a rotating lifting seat, and the high-frequency coil is located on the outside of the pipe fitting. As the rotating lifting seat rotates and rises, the quenching process of the pipe fitting is completed. However, if the pipe fitting is long, and its rotation is driven only by fixing the bottom of the pipe fitting, there will be a certain deviation in the rotation of the bottom and top of the pipe fitting during the rotation process, resulting in inconsistent spacing between different positions of the pipe fitting and the high-frequency coil, resulting in poor uniformity in heating and quenching of the pipe fitting. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a heat treatment device and a heat treatment method with a controlled atmosphere for pipe fittings, so as to solve the technical problem in the prior art that if the pipe fitting is long and is only driven to rotate by fixing the bottom of the pipe fitting, there will be a certain deviation in the rotation of the bottom and top of the pipe fitting during the rotation process, resulting in inconsistent spacing between different positions of the pipe fitting and the high-frequency coil, resulting in poor uniformity in heating and quenching of the pipe fitting.

[0006] To achieve the above object, the present invention provides the following technical solutions: A heat treatment device with a controllable atmosphere for pipe fittings, comprising a frame, a motor, a pipe fitting, a high-frequency coil module, an atmosphere ejection module and a coolant ring module, wherein the atmosphere ejection module and the coolant ring module are respectively fixed above and below the high-frequency coil module, and the atmosphere ejection module and the coolant ring module are respectively connected to external devices through pipelines;

[0007] The top and bottom of the inner side of the frame are respectively provided with a first clamping mechanism and a second clamping mechanism, the frame is provided with a transmission mechanism matched with the motor, the transmission mechanism includes a reciprocating threaded rod, and a high-frequency coil module is movably connected to the outer side of the reciprocating threaded rod, and the pipe is located on the outer sides of the first clamping mechanism and the second clamping mechanism, the first clamping mechanism includes a first fixing plate, a first lifting frame, a first reciprocating screw rod, a first clamping arm, a first one-way bearing and a second one-way bearing, the first one-way bearing and the second one-way bearing are fixed on the outer side of the motor output shaft from top to bottom, and the second clamping mechanism includes a second reciprocating screw rod and a second clamping arm;

[0008] The first lifting frame and the first fixed plate are slidably connected, the first clamping arms are rotatably connected at the four corners of the top of the first fixed plate, and the first reciprocating screw rod and the first lifting frame are threadedly connected, the first reciprocating screw rod and the motor output shaft are connected via a first one-way bearing, and the first reciprocating screw rod of the first clamping mechanism and the second reciprocating screw rod of the second clamping mechanism are fixedly connected via a transmission rod;

[0009] The first clamping mechanism also includes a first tooth plate, a first hinge seat and a first gear, four sets of the first hinge seats are fixed at the four corners of the top of the first fixing plate, and the first gear is fixed at the end of the first clamping arm, and the first tooth plates meshing with the first gear are fixed at the four corners of the outer side of the first lifting frame;

[0010] The first clamping mechanism also includes a rotating ring, which is fixed to the bottom of the first fixed plate, and the rotating ring and the motor output shaft are movably connected via a second one-way bearing;

[0011] The first clamping mechanism also includes a matching frame and a positioning ring, wherein the matching frame is fixed on the outside of the first fixing plate, and the positioning ring is fixed on the bottom end of the frame, and the end of the positioning ring extends to the inside of the matching frame;

[0012] The second clamping mechanism also includes a second fixed plate, a second lifting frame, a second gear plate, a second hinged seat and a second gear, and the second lifting frame and the second fixed plate are slidably connected;

[0013] The transmission mechanism also includes a transmission wheel and a transmission belt, and the transmission wheel and the motor output shaft are connected through the transmission belt.

[0014] By adopting the above technical solution, the pipe fitting is fixed by the first clamping mechanism and the second clamping mechanism, wherein the multiple groups of first clamping arms and second clamping arms respectively perform internal support clamping and fixing on the bottom and the top of the pipe fitting from the inside of the pipe fitting. Specifically, when the motor rotates forward, it can drive the first reciprocating screw rod, the transmission rod and the second reciprocating screw rod to rotate, so that the first clamping arm and the second clamping arm can clamp and fix the pipe fitting. When the motor rotates reversely, the second one-way bearing is locked and the first one-way bearing is idle, so that the pipe fitting can be driven to rotate by the first clamping mechanism and the second clamping mechanism. At the same time, the reciprocating threaded rod can be driven to rotate by the transmission mechanism, so that the high-frequency coil module located on the outside of the pipe fitting is axially moved from bottom to top, and the pipe fitting is subjected to high-frequency heating and quenching operation. It can be seen from the above that the first clamping mechanism and the second clamping mechanism can effectively clamp and fix the pipe fitting as a whole, effectively avoiding the phenomenon of shaking of the pipe fitting during rotation, thereby ensuring that the spacing between the high-frequency coil module and any position of the pipe fitting is consistent, thereby ensuring the uniformity of heating and quenching of the pipe fitting.

[0015] The present invention is further configured such that a top positioning mechanism is provided on the top of the frame, and the top positioning mechanism includes a flip positioning arm, a rotating frame and a positioning rod, the flip positioning arm and the frame are rotatably connected via the rotating frame, and the positioning rod is fixed on the top of the second clamping mechanism, and a positioning hole matching the positioning rod is opened inside the flip positioning arm.

[0016] By adopting the above technical solution, the positioning rod arranged on the top of the second clamping mechanism can be engaged by the flip positioning arm of the top positioning mechanism, thereby further ensuring the stability of the pipe during the rotation process.

[0017] The present invention is further configured such that connecting rods are fixed at the four corners between the first fixing plate and the second fixing plate, and guiding rods matching with the high-frequency coil module are fixed at both ends inside the frame.

[0018] By adopting the above technical solution, the connecting rod plays a role in stabilizing the connection between the first clamping mechanism and the second clamping mechanism, and the guiding rod plays a role in stabilizing the reciprocating movement of the high-frequency coil module.

[0019] A controlled atmosphere heat treatment method for pipe fittings, the process comprising the following steps:

[0020] S1: Loading the pipe: placing the pipe outside between the first clamping mechanism and the second clamping mechanism;

[0021] S2: Clamping of pipe fittings: By starting the motor, the motor first rotates forward, and the output shaft of the motor drives the first reciprocating screw, the transmission rod and the second reciprocating screw to rotate, so that under the cooperation of the gear and the toothed plate, multiple groups of first clamping arms and multiple groups of second clamping arms clamp and fix the inner wall of the pipe fitting in an internal support manner;

[0022] S3: Heat treatment quenching process: The first clamping mechanism, the second clamping mechanism and the pipe are driven to rotate by the reverse rotation of the motor, and at the same time, the high-frequency coil module is driven by the transmission mechanism to perform high-frequency heating quenching operation from bottom to top on the outer side of the pipe;

[0023] S4: Spraying in atmosphere protection: The atmosphere spraying module sprays out protective atmosphere to the pipes during the quenching process, ensuring the overall quenching quality of the pipes;

[0024] S5: Cooling: Cooling liquid is sprayed to the quenched pipes through the coolant ring module at the same time, so that the pipes are cooled.

[0025] In summary, the present invention mainly has the following beneficial effects: the present invention fixes the pipe fitting by means of the first clamping mechanism and the second clamping mechanism, wherein the plurality of first clamping arms and the second clamping arms respectively perform internal support clamping and fixing on the bottom and the top of the pipe fitting from the inside of the pipe fitting. Specifically, when the motor rotates forward, it can drive the first reciprocating screw rod, the transmission rod and the second reciprocating screw rod to rotate, thereby enabling the first clamping arm and the second clamping arm to clamp and fix the pipe fitting. When the motor rotates reversely, the second one-way bearing is locked and the first one-way bearing is idle, thereby enabling the first clamping arm to clamp and fix the pipe fitting. The mechanism and the second clamping mechanism drive the pipe to rotate. At the same time, the reciprocating threaded rod can be driven to rotate through the transmission mechanism, so that the high-frequency coil module is located on the outside of the pipe and moves axially from bottom to top, and the pipe is subjected to high-frequency heating and quenching operations. It can be seen from the above that the first clamping mechanism and the second clamping mechanism can effectively clamp and fix the pipe as a whole, effectively avoiding the shaking of the pipe during rotation, thereby ensuring that the distance between the high-frequency coil module at any position of the pipe is consistent, thereby ensuring the uniformity of heating and quenching of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 is a cross-sectional view of the present invention;

[0028] Figure 3 For the present invention Figure 2 A magnified image of point A;

[0029] Figure 4 For the present invention Figure 2 A magnified view of point B;

[0030] Figure 5 It is a schematic diagram of the internal structure of the present invention;

[0031] Figure 6 It is a structural schematic diagram of the first clamping mechanism of the present invention;

[0032] Figure 7 is a structural schematic diagram of the second clamping mechanism of the present invention;

[0033] Figure 8 It is a structural schematic diagram of the transmission mechanism of the present invention.

[0034] In the figure: 1, frame; 2, motor; 3, first clamping mechanism; 301, first fixed plate; 302, first lifting frame; 303, first reciprocating screw rod; 304, first tooth plate; 305, first hinge seat; 306, first gear; 307, first clamping arm; 308, first one-way bearing; 309, rotating ring; 310, second one-way bearing; 311, matching frame; 312, positioning ring; 4, second clamping mechanism; 401, second fixed plate; 402, second lifting frame; 40 3. Second reciprocating screw rod; 404. Second tooth plate; 405. Second hinged seat; 406. Second gear; 407. Second clamping arm; 5. Transmission mechanism; 501. Transmission wheel; 502. Transmission belt; 503. Reciprocating threaded rod; 6. Transmission rod; 7. Connecting rod; 8. High-frequency coil module; 9. Top positioning mechanism; 901. Flip positioning arm; 902. Rotating frame; 903. Positioning rod; 10. Guide rod; 11. Atmosphere ejection module; 12. Coolant ring module; 13. Pipe fittings. DETAILED DESCRIPTION

[0035] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] The following describes an embodiment of the present invention based on its overall structure.

[0037] A controlled atmosphere heat treatment device for pipe fittings, such as Figure 1-8 As shown, it includes a frame 1, a motor 2, a pipe 13, a high-frequency coil module 8, an atmosphere ejection module 11 and a coolant ring module 12, wherein the atmosphere ejection module 11 and the coolant ring module 12 are respectively fixed above and below the high-frequency coil module 8, and the atmosphere ejection module 11 and the coolant ring module 12 are respectively connected to the external device through pipelines;

[0038] A first clamping mechanism 3 and a second clamping mechanism 4 are respectively arranged at the top and the bottom of the inner side of the frame 1, and a transmission mechanism 5 matched with the motor 2 is arranged inside the frame 1, the transmission mechanism 5 includes a reciprocating threaded rod 503, and a high-frequency coil module 8 is movably connected to the outer side of the reciprocating threaded rod 503, and the pipe 13 is located on the outer sides of the first clamping mechanism 3 and the second clamping mechanism 4, the first clamping mechanism 3 includes a first fixing plate 301, a first lifting frame 302, a first reciprocating screw rod 303, a first clamping arm 307, a first one-way bearing 308 and a second one-way bearing 310, the first one-way bearing 308 and the second one-way bearing 310 are fixed from top to bottom on the outer side of the output shaft of the motor 2, and the second clamping mechanism 4 includes a second reciprocating screw rod 403 and a second clamping arm 407;

[0039] The first lifting frame 302 and the first fixed plate 301 are slidably connected, the first clamping arms 307 are rotatably connected at the four corners of the top of the first fixed plate 301, and the first reciprocating screw rod 303 and the first lifting frame 302 are threadedly connected, the first reciprocating screw rod 303 and the output shaft of the motor 2 are connected via a first one-way bearing 308, and the first reciprocating screw rod 303 of the first clamping mechanism 3 and the second reciprocating screw rod 403 of the second clamping mechanism 4 are fixedly connected via a transmission rod 6;

[0040] The first clamping mechanism 3 further includes a first tooth plate 304, a first hinge seat 305 and a first gear 306. Four sets of first hinge seats 305 are fixed at the four corners of the top of the first fixing plate 301, and the first gear 306 is fixed at the end of the first clamping arm 307. The first tooth plates 304 meshing with the first gear 306 are fixed at the four corners of the outer side of the first lifting frame 302.

[0041] When the motor 2 rotates forward, the first one-way bearing 308 is locked and the second one-way bearing 310 is idle, which can drive the first reciprocating screw 303, the transmission rod 6 and the second reciprocating screw 403 to rotate, so that the first clamping arm 307 and the second clamping arm 407 can clamp and fix the pipe 13;

[0042] The first clamping mechanism further includes a rotating ring 309, which is fixed to the bottom of the first fixed plate 301, and the rotating ring 309 and the output shaft of the motor 2 are movably connected via a second one-way bearing 310;

[0043] The first clamping mechanism 3 also includes a matching frame 311 and a positioning ring 312. The matching frame 311 is fixed on the outside of the first fixing plate 301, and the positioning ring 312 is fixed on the bottom of the frame 1, and the end of the positioning ring 312 extends to the inside of the matching frame 311. The positioning ring 312 cooperates with the matching frame 311 to make the rotation process of the first clamping mechanism 3 and the second clamping mechanism 4 more stable and avoid the phenomenon of deviation.

[0044] The second clamping mechanism 4 further includes a second fixed plate 401, a second lifting frame 402, a second tooth plate 404, a second hinge seat 405 and a second gear 406, and the second lifting frame 402 and the second fixed plate 401 are slidably connected. It should be noted that the connection method between the second fixed plate 401, the second lifting frame 402, the second tooth plate 404, the second hinge seat 405 and the second gear 406 is consistent with the connection method of the corresponding components inside the first clamping mechanism 3;

[0045] It should be noted that the transmission mechanism 5 further includes a transmission wheel 501 and a transmission belt 502 , and the transmission wheel 501 and the output shaft of the motor 2 are connected to each other through the transmission belt 502 .

[0046] For some examples, see Figure 1 , Figure 2 and Figure 5 A top positioning mechanism 9 is provided on the top of the frame 1, and the top positioning mechanism 9 includes a flip positioning arm 901, a rotating frame 902 and a positioning rod 903. The flip positioning arm 901 and the frame 1 are rotatably connected through the rotating frame 902, and the positioning rod 903 is fixed on the top of the second clamping mechanism 4. A positioning hole matching the positioning rod 903 is provided inside the flip positioning arm 901. By setting the above structure, the flip positioning arm 901 of the top positioning mechanism 9 can engage with the positioning rod 903 provided on the top of the second clamping mechanism 4, thereby further ensuring the stability of the pipe fitting 13 during the rotation process.

[0047] For some examples, see Figure 2 and Figure 5 , connecting rods 7 are fixed at the four corners between the first fixing plate 301 and the second fixing plate 401, and guide rods 10 matching the high-frequency coil module 8 are fixed at both ends of the frame 1. The present invention sets the above structure, wherein the connecting rod 7 plays the role of stability in the connection between the first clamping mechanism 3 and the second clamping mechanism 4, wherein the guide rod 10 plays the role of stability in the reciprocating movement of the high-frequency coil module 8.

[0048] A controlled atmosphere heat treatment method for pipe fittings, the process comprising the following steps:

[0049] S1: Loading the pipe: placing the pipe 13 on the outside between the first clamping mechanism 3 and the second clamping mechanism 4;

[0050] S2: Clamping of the pipe fitting: by starting the motor 2, the motor 2 first rotates forward, and the output shaft of the motor 2 drives the first reciprocating screw rod 303, the transmission rod 6 and the second reciprocating screw rod 403 to rotate, so that under the cooperation of the gear and the toothed plate, the multiple groups of first clamping arms 307 and the multiple groups of second clamping arms 407 clamp and fix the inner wall of the pipe fitting 2 in an internal support manner;

[0051] S3: heat treatment quenching process: the first clamping mechanism 3, the second clamping mechanism 4 and the pipe 13 are driven to rotate by the reverse rotation of the motor 2, and at the same time, the high-frequency coil module 8 is driven by the transmission mechanism 5 to perform high-frequency heating quenching operation from bottom to top on the outer side of the pipe 13;

[0052] S4: spraying in atmosphere protection: spraying protective atmosphere to the pipe 13 during quenching synchronously through the atmosphere spraying module 11, thereby ensuring the overall quenching quality of the pipe 13;

[0053] S5: Cooling: The cooling liquid is sprayed to the quenched pipe 13 through the cooling liquid ring module 12 at the same time, so that the pipe 13 is cooled.

[0054] The working principle of the present invention is as follows: when in use, the power is turned on, firstly the high frequency coil module 8 is connected to the external power supply device through the external power line, the interface of the atmosphere ejection module 11 is connected to the external atmosphere storage device through the pipeline, and the interface of the coolant ring module 12 is connected to the external coolant tank through the pipeline;

[0055] Specifically, the atmosphere ejection module 11 is provided with an adjustment module on the pipeline connected to the external atmosphere storage device, wherein the adjustment module may adopt an electromagnetic control valve, thereby adaptively adjusting the atmosphere ejection amount;

[0056] The pipe 13 is fixed by the first clamping mechanism 3 and the second clamping mechanism 4, wherein the plurality of first clamping arms 307 and the second clamping arms 407 respectively clamp and fix the bottom and the top of the pipe 13 from the inside of the pipe 13 in an internal support manner;

[0057] Specifically, when the motor 2 rotates forward, the first one-way bearing 308 is locked and the second one-way bearing 310 is idle, which can drive the first reciprocating screw 303, the transmission rod 6 and the second reciprocating screw 403 to rotate, so that the first clamping arm 307 and the second clamping arm 407 can clamp and fix the pipe 13;

[0058] When the motor 2 rotates in reverse, the second one-way bearing 310 is locked, and the first one-way bearing 308 rotates idly, and then the pipe 13 can be driven to rotate through the first clamping mechanism 3 and the second clamping mechanism 4;

[0059] At the same time, the transmission mechanism 5 can drive the reciprocating threaded rod 503 to rotate, so that the high-frequency coil module 8 located outside the pipe 13 moves axially from bottom to top, and performs high-frequency heating and quenching operation on the pipe 13;

[0060] Furthermore, when the quenching of the pipe 13 is completed, since the surfaces of the first reciprocating screw 303 and the second reciprocating screw 403 are bidirectional thread grooves, when the first lifting frame 302 moves to the top of the first reciprocating screw 303, the pipe 13 is just supported and fixed. If the quenched pipe 13 is removed, the motor 2 only needs to rotate forward again, and the first lifting frame 302 will descend along the first reciprocating screw 303, and then the first clamping arm 307 will shrink inward as a whole, breaking away from the clamping and fixing effect on the pipe 13. The second clamping arm 407 of the second clamping mechanism 4 is separated from the clamping of the pipe 13 in the same way as above;

[0061] As can be seen from the above, the first clamping mechanism 3 and the second clamping mechanism 4 can effectively clamp and fix the pipe 13 as a whole, effectively avoiding the shaking of the pipe 13 during the rotation process, thereby ensuring that the distance between any position of the pipe 13 and the high-frequency coil module 8 is consistent, thereby ensuring the uniformity of heating and quenching of the pipe 13;

[0062] Furthermore, after the first clamping mechanism 3 and the second clamping mechanism 4 clamp and fix the pipe 13, the flip positioning arm 901 of the top positioning mechanism 9 can engage the positioning rod 903 set on the top of the second clamping mechanism 4, further ensuring the stability of the pipe 13 during rotation.

[0063] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A controlled atmosphere heat treatment device for pipe fittings, characterized in that: It comprises a frame (1), a motor (2), a pipe (13), a high-frequency coil module (8), an atmosphere ejection module (11) and a cooling liquid ring module (12); A first clamping mechanism (3) and a second clamping mechanism (4) are respectively arranged at the top and bottom of the inner side of the frame (1); a transmission mechanism (5) matched with the motor (2) is arranged inside the frame (1); the transmission mechanism (5) comprises a reciprocating threaded rod (503); a high-frequency coil module (8) is movably connected to the outer side of the reciprocating threaded rod (503); and the pipe (13) is located on the outer side of the first clamping mechanism (3) and the second clamping mechanism (4); the first clamping mechanism (3) comprises a first fixing plate (301), a first lifting frame (302), a first reciprocating screw rod (303), a first clamping arm (307), a first one-way bearing (308) and a second one-way bearing (310); the first one-way bearing (308) and the second one-way bearing (310) are fixed from top to bottom on the outer side of the output shaft of the motor (2); and the second clamping mechanism (4) comprises a second reciprocating screw rod (403) and a second clamping arm (407); The first lifting frame (302) and the first fixed plate (301) are slidably connected, the first fixing plate (301) is rotatably connected to the first clamping arm (307) at the four corners of the top, the first reciprocating screw (303) and the first lifting frame (302) are threadedly connected, the first reciprocating screw (303) and the output shaft of the motor (2) are connected via a first one-way bearing (308), and the first reciprocating screw (303) of the first clamping mechanism (3) and the second reciprocating screw (403) of the second clamping mechanism (4) are fixedly connected via a transmission rod (6).

2. The controlled atmosphere heat treatment device for pipes according to claim 1, characterized in that: The first clamping mechanism (3) further comprises a first tooth plate (304), a first hinge seat (305) and a first gear (306); four sets of the first hinge seats (305) are fixed at the four corners of the top of the first fixing plate (301); the first gear (306) is fixed at the end of the first clamping arm (307); and first tooth plates (304) meshing with the first gear (306) are fixed at the four corners of the outer side of the first lifting frame (302).

3. The controlled atmosphere heat treatment device for pipes according to claim 1, characterized in that: The first clamping mechanism further comprises a rotating ring (309), the rotating ring (309) being fixed to the bottom of the first fixed plate (301), and the rotating ring (309) and the output shaft of the motor (2) being movably connected via a second one-way bearing (310).

4. The controlled atmosphere heat treatment device for pipes according to claim 1, characterized in that: The first clamping mechanism (3) further comprises a matching frame (311) and a positioning ring (312), wherein the matching frame (311) is fixed to the outside of the first fixing plate (301), and the positioning ring (312) is fixed to the bottom end inside the frame (1), and the end of the positioning ring (312) extends to the inside of the matching frame (311).

5. The controlled atmosphere heat treatment device for pipes according to claim 1, characterized in that: The second clamping mechanism (4) further comprises a second fixed plate (401), a second lifting frame (402), a second toothed plate (404), a second hinged seat (405) and a second gear (406), and the second lifting frame (402) and the second fixed plate (401) are slidably connected.

6. The controlled atmosphere heat treatment device for pipe fittings according to claim 5, characterized in that: Connecting rods (7) are fixed at the four corners between the first fixing plate (301) and the second fixing plate (401), and guide rods (10) matching with the high-frequency coil module (8) are fixed at both ends inside the frame (1).

7. The controlled atmosphere heat treatment device for pipes according to claim 1, characterized in that: The transmission mechanism (5) further comprises a transmission wheel (501) and a transmission belt (502); the transmission wheel (501) and the output shaft of the motor (2) are connected in transmission via the transmission belt (502).

8. The controlled atmosphere heat treatment device for pipes according to claim 1, characterized in that: A top positioning mechanism (9) is provided on the top of the frame (1), and the top positioning mechanism (9) comprises a flip positioning arm (901), a rotating frame (902) and a positioning rod (903); the flip positioning arm (901) and the frame (1) are rotatably connected via the rotating frame (902), and the positioning rod (903) is fixed on the top of the second clamping mechanism (4); a positioning hole matching the positioning rod (903) is provided inside the flip positioning arm (901).

9. The controlled atmosphere heat treatment device for pipes according to claim 1, characterized in that: The atmosphere ejection module (11) and the cooling liquid ring module (12) are respectively fixed above and below the high-frequency coil module (8), and the atmosphere ejection module (11) and the cooling liquid ring module (12) are respectively connected to the atmosphere storage device and the cooling liquid tank via pipelines.

10. A controlled atmosphere heat treatment method for pipe fittings, characterized in that: The heat treatment operation is carried out using the heat treatment device with controlled atmosphere for pipe fittings as claimed in any one of claims 1 to 9, and the process comprises the following steps: S1: loading the pipe: placing the pipe (13) outside between the first clamping mechanism (3) and the second clamping mechanism (4); S2: Clamping of the pipe fitting: by starting the motor (2), the motor (2) first rotates forward, and the output shaft of the motor (2) drives the first reciprocating screw rod (303), the transmission rod (6) and the second reciprocating screw rod (403) to rotate, so that under the cooperation of the gear and the toothed plate, the plurality of groups of first clamping arms (307) and the plurality of groups of second clamping arms (407) clamp and fix the inner wall of the pipe fitting (13) in an internal support manner; S3: heat treatment quenching process: the motor (2) is reversed to drive the first clamping mechanism (3), the second clamping mechanism (4) and the pipe (13) to rotate, and at the same time, the transmission mechanism (5) drives the high-frequency coil module (8) located on the outside of the pipe (13) to perform high-frequency heating quenching from bottom to top; S4: spraying in atmosphere protection: spraying protective atmosphere to the pipe (13) during the quenching process through the atmosphere spraying module (11), thereby ensuring the overall quenching quality of the pipe (13); S5: Cooling: Cooling liquid is sprayed onto the quenched pipe fittings (13) through the cooling liquid ring module (12) at the same time, so that the pipe fittings (13) are cooled.

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