Heat treatment device and method for bent pipe

Abstract

The invention discloses a heat treatment device and method for bent pipes, and relates to the technical field of heat treatment of bent pipes. The heat treatment device comprises a table top, and a fixing assembly, a heat treatment mechanism, an arc-shaped guide mechanism and an infrared temperature measurement camera which are mounted on the table top; the fixing assembly is used for fixing the bent pipe. The heat treatment mechanism comprises a supporting frame, a fine adjustment supporting frame, an inductor, an adjusting assembly and a coarse adjustment supporting frame. The fine adjustment supporting frame, the inductor and the coarse adjustment supporting frame are all fixedly installed on the supporting frame. The adjusting assembly comprises a magnetizer, a coarse adjusting lifting frame and a wedge-shaped magnetic bar; the magnetizer is fixedly arranged on the inductor; a through hole corresponding to the wedge-shaped magnetic bar is formed in the magnetizer; the wedge-shaped magnetic bar is rotationally mounted on the coarse adjustment lifting frame; the coarse adjustment lifting frame is installed on the coarse adjustment supporting frame in a sliding mode. The mode of combining coarse adjustment and fine adjustment is adopted, the heating temperature is adjusted by adjusting the working area, entering the magnetizer, of the wedge-shaped magnetic rod, the guide cylinder and the bent pipe are designed in a matched mode, and only the guide cylinder needs to be replaced when different bent pipes are subjected to heat treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of heat treatment of bent pipes, and in particular to a device and method for heat treatment of bent pipes. Background Art

[0002] As an important part of the pipeline system, pipe bends play a key role in many industries. Whether it is the water supply and drainage system in the construction industry, fluid transmission in mechanical engineering, or high-tech fields such as petrochemicals, shipbuilding, and aerospace, pipe bends play an indispensable role.

[0003] With the advancement of science and technology and the development of the industry, the application field of pipe bending is constantly expanding, and the performance requirements for pipe bending are also constantly increasing. Pipe bending heat treatment technology is mainly used in the heat treatment process of steel pipes to improve the mechanical properties and corrosion resistance of steel pipes. Heat treatment technology includes normalizing, tempering, quenching, etc. By controlling the heating temperature and time, the internal structure of the steel pipe changes, so as to achieve the expected performance requirements.

[0004] Therefore, obtaining bends with high wear resistance, corrosion resistance and high temperature stability has become a difficult problem that is being overcome in the field of bend research and development. However, existing heat treatment equipment and technology may not meet the high quality requirements of bends in some cases. For example, during the bending process of the pipe, due to the plastic deformation of the material, different parts of the pipe will experience different stress states, thereby forming a compression layer (the side close to the center of the bend), a neutral layer (a transition layer that is neither stretched nor compressed) and a tensile layer (the side away from the center of the bend). Due to the different thicknesses of the three, conventional heat treatment equipment that adopts overall tempering cannot evenly heat and cool the bend, resulting in local overheating or uneven cooling, which in turn affects the performance and dimensional stability of the bend, making it impossible to obtain high-quality bends that meet the requirements of high-tech fields and extreme working conditions.

[0005] In summary, it is necessary to invent a set of induction heat treatment equipment and method that can heat different areas of a bent pipe to different temperatures. Summary of the invention

[0006] In view of the above problems, the present invention proposes a device and method for heat treatment of bent pipes, and the technical solutions adopted are as follows: A pipe bending heat treatment device comprises a table, and a fixing assembly mounted on the table, a heat treatment mechanism, an arc-shaped guide mechanism and an infrared temperature measuring camera; the fixing assembly is used to fix the pipe bending; The heat treatment mechanism includes a support frame, a fine-adjustment support frame, a sensor, an adjustment component, a coarse-adjustment support frame and a coarse-adjustment drive component; the fine-adjustment support frame, the sensor and the coarse-adjustment support frame are all fixedly mounted on the support frame; The adjustment assembly includes a magnetic conductor, a coarse adjustment lifting frame, a wedge-shaped magnetic rod and a rotation drive device; the magnetic conductor is fixedly mounted on the inductor; a through hole corresponding to the wedge-shaped magnetic rod is provided on the magnetic conductor; the wedge-shaped magnetic rod is rotatably mounted on the coarse adjustment lifting frame and driven to rotate by the rotation drive device; the coarse adjustment lifting frame is slidably mounted on the coarse adjustment support frame and driven to slide by the coarse adjustment drive assembly; The inductor is hollow inside and is externally connected to a water cooling device and a high-frequency generator; The arc guide mechanism includes a driving screw and an arc guide assembly; the driving screw is installed on the table top, and a slider is provided on it, and the support frame is slidably connected to the slider; the arc guide assembly includes a guide cylinder, a support plate, a guide rack, a guide gear and a guide rod; the guide cylinder is rotatably installed on the slider, and the guide gear is coaxially fixedly installed on the guide cylinder; the support plate is fixedly installed on the table top, and the guide rack is fixedly installed on the support plate and meshed with the guide gear; a spiral guide track is provided on the guide cylinder; the guide rod is fixedly installed on the support frame and slidably installed in the guide track; the guide track is matched with the bent pipe, and its pitch change corresponds to the bending curvature of the bent pipe.

[0007] Furthermore, the rotation drive device includes a fine-tuning support plate, a fine-tuning motor, a fine-tuning gear and an angle adjustment gear; the fine-tuning support plate is fixedly mounted on the fine-tuning support frame; the fine-tuning motor is fixedly mounted on the fine-tuning support plate, and its output end is coaxially fixedly connected to the fine-tuning gear; an angle adjustment gear is coaxially fixedly mounted on the wedge-shaped magnetic rod; the angle adjustment gear is synchronously meshed with the fine-tuning gear.

[0008] Furthermore, the coarse adjustment drive assembly includes a drive support frame, a gear ring, a coarse adjustment gear and a coarse adjustment motor; the drive support frame is fixedly mounted on the support frame; the gear ring is rotatably mounted on the drive support frame; the coarse adjustment motor is fixedly mounted on the drive support frame, and the coarse adjustment gear is coaxially fixedly mounted on the output end of the coarse adjustment motor and meshed with the gear ring; a coarse adjustment rack meshed with the gear ring is fixedly mounted on the coarse adjustment lifting frame.

[0009] Furthermore, the fixing assembly includes an inner support chuck and a tail end support seat fixedly mounted on the table, and the inner support chuck and the tail end support seat correspond to the two ends of the bent pipe respectively.

[0010] Furthermore, it also includes a stand; the table top is fixedly installed on the stand, and the stand is used to drive the table top to rise and fall.

[0011] Furthermore, the cross-sectional area of ​​the wedge-shaped magnetic rod gradually decreases from top to bottom.

[0012] Furthermore, the adjustment component also includes a protection box, the protection box is fixedly mounted on the fine-tuning support plate, and the fine-tuning motor is placed in the protection box.

[0013] The heat treatment method of the bent pipe heat treatment device comprises the following steps: The first step is to determine the model, size, mechanical power and production requirements of the elbow to be heated; The second step is to select the guide cylinder that matches the elbow according to the actual production conditions and replace it; The third step is to preliminarily set the working area of ​​the wedge-shaped magnetic rod according to the different temperature requirements of the compression layer, neutral layer and tensile layer of the bent pipe; The fourth step is to fix the bent pipe on the table; the water cooling device connected to the sensor injects circulating water into the sensor; the high-frequency generator is started, and the high-frequency current passes through the sensor to start heating the bent pipe; the driving screw is started, and the support frame moves along the bent pipe; During the movement of the support frame, the working area of ​​the wedge-shaped magnetic rod is adjusted based on the temperature feedback from the infrared temperature measuring camera, and the heating target is considered to be achieved within the preset temperature error range; during adjustment, the coarse adjustment drive component is started according to the actual production conditions to drive the coarse adjustment lifting frame to slide and adjust the working area of ​​the wedge-shaped magnetic rod entering the magnetizer until the temperature of the heating area of ​​the bent pipe meets the actual production requirements; when the temperature change caused by the coarse adjustment cannot meet the heating requirements, the rotary drive device is started according to the actual production conditions to drive the wedge-shaped magnetic rod to rotate for fine adjustment to achieve the required heating temperature; Step 5. After the heat treatment is completed, remove the bent pipe.

[0014] Since the present invention adopts the above technical solution, the present invention has the following advantages: 1. The heat treatment mechanism of the present invention adopts a combination of coarse adjustment and fine adjustment to adjust the heating temperature by adjusting the working area of ​​the wedge-shaped magnetic rod entering the magnetic conductor, thereby realizing dynamic temperature adjustment during the heating process, and being able to meet the different heating temperature requirements of different areas on the same elbow cross section, thereby realizing regionalized precise temperature control, thereby being able to obtain higher quality and higher performance elbows.

[0015] 2. The infrared temperature measuring camera of the present invention can monitor the temperature of the heated area in real time, so that the heat treatment mechanism can adjust the heating temperature in real time according to temperature feedback, thereby realizing automatic and precise temperature control.

[0016] 3. The arc-shaped guide mechanism of the present invention can drive the heat treatment mechanism to move along the actual curved arc of the bent pipe, and the guide cylinder is designed to match the bent pipe. When different bent pipes are heat treated, only the guide cylinder needs to be replaced, which greatly reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1-Figure 6 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 7It is a structural schematic diagram of the heat treatment mechanism of the present invention.

[0019] Figure 8 This is a schematic diagram of the structure of the heat treatment mechanism of the present invention without the coarse adjustment support frame.

[0020] Fig. 9 It is a structural schematic diagram of the heat treatment mechanism of the present invention without the support frame, fine-tuning support frame and sensor.

[0021] Figure 10-12 It is a schematic diagram of the explosion assembly structure of the heat treatment mechanism of the present invention.

[0022] Figure 13-Figure 14 It is a schematic diagram of the structure of the regulating component in the heat treatment mechanism of the present invention.

[0023] Fig.15 This is a schematic diagram of the structure of the adjustment component of the present invention without the magnetic conductor and the fine-tuning support plate.

[0024] Fig.16 It is a schematic structural diagram of a driving support frame in a coarse adjustment driving assembly of the present invention.

[0025] Fig.17 For the present invention Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0026] Fig.18 It is a schematic structural diagram of a slider in a driving screw of the present invention.

[0027] Figure Number: 1- Countertop; 2-Internal support chuck; 3- Tail end support seat; 4-Heat treatment mechanism; 41-support frame; 42-fine-adjustment support frame; 43-sensor; 44-adjustment assembly (4401-magnetic conductor; 4402-coarse-adjustment lifting frame; 4403-coarse-adjustment rack; 4404-wedge-shaped magnetic rod; 4405-fine-adjustment support plate; 4406-fine-adjustment motor; 4407-fine-adjustment gear; 4408-angle adjustment gear; 4409-protection box); 45-coarse-adjustment support frame (4501-limiting slide rail); 46-coarse-adjustment drive assembly (4601-drive support frame; 4602-gear ring; 4603-coarse-adjustment gear; 4604-coarse-adjustment motor); 5-arc guide mechanism; 51-driving screw [5101-sliding block (5101a-limiting driving block)]; 52-arc guide assembly [5201-guide cylinder (5201a-guide rail); 5202-support plate; 5203-guide rack; 5204-guide gear; 5205-guide rod]; 6-stand; 7-Infrared temperature camera; 8-Bend pipe. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further specifically described below by way of embodiments and in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0029] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "up", "down", "in", "out", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. Embodiment 1:

[0030] This embodiment provides a pipe bending heat treatment device, such as Figure 1-Figure 6 As shown, it includes a table 1, an inner support chuck 2, a tail end support seat 3, a heat treatment mechanism 4, an arc guide mechanism 5, a stand 6 and an infrared temperature measuring camera 7; the stand 6 adopts a scissor-type lifting frame, and the table 1 is fixedly installed on the top platform of the stand 6; the inner support chuck 2 is fixedly installed on the table 1 through a connecting plate (not shown in the figure), and is used to support the bent pipe 8 from the inside of the end side; the tail end support seat 3 is fixedly installed on the table 1, and is provided with an arc-shaped support plate for supporting the end side of the bent pipe 8; the inner support chuck 2 and the tail end support seat 3 correspond to the two ends of the bent pipe 8 respectively; the heat treatment mechanism 4, the arc guide mechanism 5 and the infrared temperature measuring camera 7 are all arranged on the table 1.

[0031] like Figure 17-Figure 18The arc guide mechanism 5 includes a driving screw 51 and an arc guide assembly 52; the driving screw 51 adopts a servo screw and is horizontally installed on the table 1; a slider 5101 is installed on the driving screw 51, and a limited position driving block 5101a is fixedly installed on the slider 5101; the arc guide assembly 52 includes a guide cylinder 5201, a support plate 5202, a guide rack 5203, a guide gear 5204 and a guide rod 5205; the axis of the guide cylinder 5201 is perpendicular to the axis of the driving screw 51, and the guide cylinder 5201 is rotatably installed on the guide cylinder 5201. On the slider 5101; a spiral guide track 5201a is provided on the guide cylinder 5201; the guide rod 5205 is slidably installed in the guide track 5201a; the support plate 5202 is fixedly installed on the table 1, the guide rack 5203 is horizontally fixedly installed on the support plate 5202 and is parallel to the driving screw 51, and the guide gear 5204 is coaxially fixedly installed on the guide cylinder 5201 and meshed with the guide rack 5203; the guide track 5201a is matched with the heat-treated curved pipe 8, and its pitch change corresponds to the bending curvature of the curved pipe 8.

[0032] like Figure 7-Figure 16 As shown, the heat treatment mechanism 4 includes a support frame 41, a fine-adjustment support frame 42, an inductor 43, an adjustment assembly 44, a coarse-adjustment support frame 45 and a coarse-adjustment drive assembly 46; a sliding rod is fixedly provided on the support frame 41, and the sliding rod and the axis of the driving screw 51 are perpendicular to each other, and a limiting hole is provided on the limiting drive block 5101a corresponding to the sliding rod, and the sliding rod passes through the limiting hole and is slidably connected to the limiting drive block 5101a; the guide rod 5205 is fixedly installed on the sliding rod of the support frame 41; the fine-adjustment support frame 42, the inductor 43 and the coarse-adjustment support frame 45 are all fixedly installed on the support frame 41; the inductor 43 adopts a circular coil with a hollow interior, and the inductor 43 is externally connected to a water cooling device, and circulating water is introduced for cooling during operation; the inductor 43 is externally connected to a high-frequency generator; The adjustment assembly 44 is provided with two groups, each group includes a magnetic conductor 4401, a coarse adjustment lifting frame 4402, a coarse adjustment rack 4403, a wedge-shaped magnetic rod 4404, a fine adjustment support plate 4405, a fine adjustment motor 4406, a fine adjustment gear 4407, an angle adjustment gear 4408 and a protective box 4409; the fine adjustment support plate 4405 is fixedly mounted on the fine adjustment support frame 42, and the protective box 4409 is fixedly mounted on the fine adjustment support plate 4405; the fine adjustment motor 4406 adopts a servo motor, and is fixedly mounted on the fine adjustment support plate 4405 and placed in the protective box 4409; the fine adjustment gear 4407 is coaxially fixedly mounted on the output end of the fine adjustment motor 4406; The magnetizer 4401 is fixedly mounted on the inductor 43; the magnetizer 4401 is provided with two through holes with diameters slightly larger than the maximum cross-sectional area of ​​the wedge-shaped magnetic rod 4404; each through hole corresponds to a wedge-shaped magnetic rod 4404; the two wedge-shaped magnetic rods 4404 are both rotatably mounted on the coarse adjustment lifting frame 4402, and the coarse adjustment lifting frame 4402 intermittently drives the wedge-shaped magnetic rods 4404 into the corresponding through holes; the coarse adjustment support frame 45 is provided with a limiting slide rail 4501, and the coarse adjustment rack 4403 is fixedly mounted on the coarse adjustment lifting frame 4402 and slidably mounted on the limiting slide rail 4501; The cross-sectional area of ​​the wedge-shaped magnetic rod 4404 gradually decreases from top to bottom, and the temperature of the heated area of ​​the curved tube 8 is positively correlated with the working area of ​​the wedge-shaped magnetic rod 4404 entering the magnetizer 4401; an angle adjustment gear 4408 is coaxially fixedly installed on the top of each wedge-shaped magnetic rod 4404; a transition gear rotatably installed on the coarse adjustment lifting frame 4402 is provided between the two angle adjustment gears 4408, and the two angle adjustment gears 4408 are meshed with the transition gear; one of the angle adjustment gears 4408 is meshed with the fine adjustment gear 4407; The coarse adjustment drive assembly 46 includes a drive support frame 4601, a ring gear 4602, a coarse adjustment gear 4603 and a coarse adjustment motor 4604; the drive support frame 4601 is fixedly mounted on the support frame 41; each coarse adjustment rack 4403 is correspondingly provided with a set of ring gears 4602, coarse adjustment gears 4603 and coarse adjustment motor 4604, the ring gear 4602 is rotatably mounted on the drive support frame 4601 and meshes with the corresponding coarse adjustment rack 4403, the coarse adjustment motor 4604 adopts a servo motor and is fixedly mounted on the drive support frame 4601, and the coarse adjustment gear 4603 is coaxially fixedly mounted on the output end of the coarse adjustment motor 4604 and meshes with the ring gear 4602.

[0033] The working method and principle of the pipe bending heat treatment device are as follows: In the first step, the operator inserts one end of the bent pipe 8 through the driving support frame 4601, the coarse adjustment support frame 45, the sensor 43 and the fine adjustment support frame 42 into the inner support chuck 2, and places the other end on the tail end support seat 3; starts the inner support chuck 2, opens it from the inside to fix the bent pipe 8; installs the guide cylinder 5201 matching the bent pipe 8 to be heat treated; In the second step, the water cooling device connected to the inductor 43 injects circulating water into the inductor 43; the high-frequency generator is started, and a high-frequency current passes through the inductor 43 to start heating the bent pipe 8; The third step is to start the driving screw 51, and the slider 5101 drives the support frame 41, the guide cylinder 5201 and the guide gear 5204 to move; the guide gear 5204 meshes with the guide rack 5203 and rotates, driving the guide cylinder 5201 to rotate relative to the slider 5101, so that the guide rod 5205 slides in the guide track 5201a, driving the sliding rod of the support frame 41 to slide in the limit driving block 5101a, so that the support frame 41 can move along the curved pipe 8, and the sensor 43 moves accordingly, and the curved pipe 8 is heat treated; During the movement of the support frame 41, the infrared temperature measuring camera 7 monitors the temperature of the heated area in real time and performs dynamic temperature adjustment according to the temperature feedback; the adjustment is divided into coarse adjustment and fine adjustment: during coarse adjustment, the coarse adjustment motor 4604 is started, the coarse adjustment gear 4603 drives the gear ring 4602 to rotate, the gear ring 4602 drives the coarse adjustment rack 4403 to move along the limit slide rail 4501 on the coarse adjustment support frame 45, and the coarse adjustment lifting frame 4402 drives the wedge-shaped magnetic rod 4404 to move, changing the working area of ​​the wedge-shaped magnetic rod 4404 entering the magnetizer 4401; during fine adjustment, the fine adjustment motor 4406 is started, the fine adjustment gear 4407 drives the angle adjustment gear 4408 meshing therewith to rotate, and the angle adjustment gear 4408 drives another angle adjustment gear 4408 to rotate through the transition gear, so that the two wedge-shaped magnetic rods 4404 rotate, changing the working area of ​​the wedge-shaped magnetic rod 4404 entering the magnetizer 4401; Step 4: After the heat treatment is completed, the inner support chuck 2 releases the bent pipe 8 and the bent pipe 8 is removed. Embodiment 2:

[0034] A heat treatment method for a bent pipe based on the bent pipe heat treatment device in Example 1 comprises the following steps: The first step is to determine the model, size, mechanical power and production requirements of the elbow 8 to be heated; The second step is to select the guide cylinder 5201 matching the elbow 8 according to the actual production conditions and replace it; The third step is to preliminarily set the working area of ​​the wedge-shaped magnetic rod 4404 to 30%, 40% and 50% according to the different temperature requirements of the compression layer, neutral layer and tensile layer of the bent pipe 8; The fourth step is to insert one end of the curved pipe 8 through the driving support frame 4601, the coarse adjustment support frame 45, the sensor 43 and the fine adjustment support frame 42 into the inner support chuck 2, and place the other end on the tail end support seat 3; start the inner support chuck 2, open it from the inside to fix the curved pipe 8; the water cooling device connected to the sensor 43 injects circulating water into the sensor 43; start the high-frequency generator, and the high-frequency current passes through the sensor 43 to start heating the curved pipe 8; start the driving screw 51, and the support frame 41 moves along the curved pipe 8; During the movement of the support frame 41, the working area of ​​the wedge-shaped magnetic rod 4404 is adjusted based on the temperature feedback from the infrared temperature measuring camera 7, and the difference of ±5°C from the preset temperature is considered to have reached the heating target; during adjustment, the coarse adjustment motor 4604 is started according to the actual production conditions, and the working area of ​​the wedge-shaped magnetic rod 4404 entering the magnetizer 4401 is adjusted, and the adjustment amount is 10% each time until the temperature of the heating area of ​​the bent pipe 8 meets the actual production requirements; when the temperature change caused by the coarse adjustment is ≥50°C and cannot meet the heating requirements, the fine adjustment motor 4406 is started according to the actual production conditions, and the wedge-shaped magnetic rod 4404 rotates for fine adjustment to achieve the required heating temperature; Step 5: After the heat treatment is completed, remove the bent pipe 8.

Claims

1. A pipe bending heat treatment device, characterized in that: It comprises a table top (1), and a fixing component mounted on the table top (1), a heat treatment mechanism (4), an arc-shaped guide mechanism (5), and an infrared temperature measuring camera (7); the fixing component is used to fix the bent pipe (8); The heat treatment mechanism (4) comprises a support frame (41), a fine-adjustment support frame (42), a sensor (43), an adjustment component (44), a coarse-adjustment support frame (45), and a coarse-adjustment drive component (46); the fine-adjustment support frame (42), the sensor (43), and the coarse-adjustment support frame (45) are all fixedly mounted on the support frame (41); The adjustment assembly (44) comprises a magnetic conductor (4401), a coarse adjustment lifting frame (4402), a wedge-shaped magnetic rod (4404) and a rotation drive device; the magnetic conductor (4401) is fixedly mounted on the inductor (43); a through hole corresponding to the wedge-shaped magnetic rod (4404) is provided on the magnetic conductor (4401); the wedge-shaped magnetic rod (4404) is rotationally mounted on the coarse adjustment lifting frame (4402) and driven to rotate by the rotation drive device; the coarse adjustment lifting frame (4402) is slidably mounted on the coarse adjustment support frame (45) and driven to slide by the coarse adjustment driving assembly (46); The inductor (43) is hollow inside and is externally connected to a water cooling device and a high-frequency generator; The arc guide mechanism (5) comprises a driving screw (51) and an arc guide assembly (52); the driving screw (51) is mounted on the table (1) and is provided with a slider (5101); the support frame (41) is slidably connected to the slider (5101); the arc guide assembly (52) comprises a guide cylinder (5201), a support plate (5202), a guide rack (5203), a guide gear (5204) and a guide rod (5205); the guide cylinder (5201) is rotatably mounted on the slider (5101), and the guide gear (5204) is coaxial with the slider (5101). The guide rod (5205) is fixedly mounted on the guide cylinder (5201); the support plate (5202) is fixedly mounted on the table (1); the guide rack (5203) is fixedly mounted on the support plate (5202) and meshes with the guide gear (5204); a spiral guide track (5201a) is provided on the guide cylinder (5201); the guide rod (5205) is fixedly mounted on the support frame (41) and slidably mounted in the guide track (5201a); the guide track (5201a) is matched with the curved pipe (8), and the pitch variation of the guide track corresponds to the curvature of the curved pipe (8).

2. A pipe bending heat treatment device according to claim 1, characterized in that: The rotation drive device comprises a fine-tuning support plate (4405), a fine-tuning motor (4406), a fine-tuning gear (4407) and an angle adjustment gear (4408); the fine-tuning support plate (4405) is fixedly mounted on the fine-tuning support frame (42); the fine-tuning motor (4406) is fixedly mounted on the fine-tuning support plate (4405), and its output end is coaxially fixedly connected to the fine-tuning gear (4407); an angle adjustment gear (4408) is coaxially fixedly mounted on the wedge-shaped magnetic rod (4404); and the angle adjustment gear (4408) is synchronously meshed with the fine-tuning gear (4407).

3. The pipe bending heat treatment device according to claim 1, characterized in that: The coarse adjustment drive assembly (46) comprises a drive support frame (4601), a gear ring (4602), a coarse adjustment gear (4603) and a coarse adjustment motor (4604); the drive support frame (4601) is fixedly mounted on the support frame (41); the gear ring (4602) is rotatably mounted on the drive support frame (4601); the coarse adjustment motor (4604) is fixedly mounted on the drive support frame (4601); the coarse adjustment gear (4603) is coaxially fixedly mounted on the output end of the coarse adjustment motor (4604) and meshes with the gear ring (4602); and a coarse adjustment rack (4403) meshing with the gear ring (4602) is fixedly mounted on the coarse adjustment lifting frame (4402).

4. The pipe bending heat treatment device according to claim 1, characterized in that: The fixing assembly comprises an inner support chuck (2) and a tail end support seat (3) fixedly mounted on the table top (1); the inner support chuck (2) and the tail end support seat (3) respectively correspond to the two ends of the bent pipe (8).

5. The pipe bending heat treatment device according to claim 1, characterized in that: It also includes a stand (6); the table top (1) is fixedly mounted on the stand (6), and the stand (6) is used to drive the table top (1) to rise and fall.

6. The pipe bending heat treatment device according to claim 1, characterized in that: The cross-sectional area of ​​the wedge-shaped magnetic rod (4404) gradually decreases from top to bottom.

7. The device for heat treatment of bent pipe according to claim 2, characterized in that: The adjustment component (44) further comprises a protection box (4409), wherein the protection box (4409) is fixedly mounted on the fine-tuning support plate (4405), and the fine-tuning motor (4406) is placed inside the protection box (4409).

8. The heat treatment method of a pipe bending heat treatment device according to claim 1, characterized in that: The following steps are involved: The first step is to determine the model, size, mechanical power and production requirements of the bent pipe (8) to be heated; The second step is to select a guide cylinder (5201) matching the elbow (8) according to actual production conditions and replace it; The third step is to preliminarily set the working area of ​​the wedge-shaped magnetic rod (4404) according to the different temperature requirements of the compression layer, neutral layer and tensile layer of the bent pipe (8); In the fourth step, the curved pipe (8) is fixed on the table (1); a water cooling device connected to the sensor (43) injects circulating water into the sensor (43); the high-frequency generator is started, and a high-frequency current passes through the sensor (43) to start heating the curved pipe (8); the driving screw (51) is started, and the support frame (41) moves along the curved pipe (8); During the movement of the support frame (41), the working area of ​​the wedge-shaped magnetic rod (4404) is adjusted based on the temperature feedback from the infrared temperature measuring camera (7), and the heating target is considered to be achieved if the temperature is within the preset temperature error range; during the adjustment, the coarse adjustment drive component (46) is started according to the actual production conditions to drive the coarse adjustment lifting frame (4402) to slide and adjust the working area of ​​the wedge-shaped magnetic rod (4404) entering the magnetizer (4401) until the temperature of the heating area of ​​the bent pipe (8) meets the actual production requirements; when the temperature change caused by the coarse adjustment cannot meet the heating requirements, the rotation drive device is started according to the actual production conditions to drive the wedge-shaped magnetic rod 4404 to rotate for fine adjustment to achieve the required heating temperature; Step 5. After the heat treatment is completed, remove the bent pipe (8).

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