A device for local heat treatment of pipe fittings based on high-frequency induction heating

Abstract

This utility model discloses a local heat treatment device for pipe fittings based on high-frequency induction heating, relating to the field of pipe fitting heat treatment technology. The utility model includes a processing table and a fixing mechanism positioned above the processing table. Specifically, the fixing mechanism involves retracting an electric push rod, causing the right-side fixing plate to move to the left, bringing both ends of the pipe fitting into contact with the two fixing plates. Then, two motors are activated to rotate clockwise, while the left-side motor drives a rotating shaft, causing the annular protrusion to move to the left, pushing the right ends of the three hinge rods away from each other and into contact with the inner wall of the pipe fitting, thus fixing the left end of the pipe fitting. The right-side motor fixes the right side of the pipe fitting in the same way. After treatment, the two motors are activated to rotate counterclockwise, bringing the two annular protrusions closer together, ceasing to press against the hinge rods, and releasing the fixing. This structure can quickly fix pipe fittings of different lengths and diameters, significantly improving the processing efficiency and applicability of the device.

Description

Technical Field

[0001] This utility model belongs to the field of pipe heat treatment technology, and in particular relates to a local heat treatment device for pipes based on high-frequency induction heating. Background Technology

[0002] In industrial production, local heat treatment of pipe fittings is a key process to ensure their performance. It is widely used in petrochemical, aerospace, and automobile manufacturing industries. For example, the sealing surface of high-pressure pipe fittings needs to be locally quenched to improve hardness, and specific areas of thin-walled pipe fittings need to be tempered to improve toughness. Traditional heat treatment equipment typically heats pipes using high-frequency inductors. Before heating, clamps are used to fix both ends of the pipes. After fixing, heat treatment is performed. However, traditional clamps are mostly fixed structures, making it difficult to handle pipes of different lengths. When fixing pipes with different diameters, workers also need to use tools to adjust the diameter of the clamps before fixing can be done. Therefore, this method has low flexibility. When dealing with pipes of different specifications, the spacing and diameter of the clamps need to be adjusted, which is time-consuming and labor-intensive, leading to a decrease in overall production efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a local heat treatment device for pipe fittings based on high-frequency induction heating. By setting up a fixing mechanism, specifically, the electric push rod is activated to retract, causing the right-side fixing plate to move to the left, bringing both ends of the pipe fitting into contact with the two fixing plates. Then, two motors are activated to rotate clockwise, and the left-side motor drives the rotating shaft to rotate, causing the annular protrusion to move to the left, pushing the right ends of the three hinge rods away from each other and into contact with the inner wall of the pipe fitting, thus fixing the left end of the pipe fitting. The right-side motor fixes the right side of the pipe fitting in the same way. After treatment, the two motors are activated to rotate counterclockwise, bringing the two annular protrusions closer together, no longer pressing the hinge rods, thus releasing the fixation. This structure can quickly fix pipe fittings of different lengths and diameters, significantly improving the processing efficiency and applicability of the device. It solves the problem that existing traditional heat treatment devices require clamps to fix pipe fittings during operation, but these clamps are mostly fixed structures, making it difficult to fix pipe fittings of different specifications, thus requiring a lot of time for adjustment.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to a device for local heat treatment of pipe fittings based on high-frequency induction heating, comprising a processing table, a high-frequency inductor disposed above the processing table, and further comprising: A fixing mechanism, positioned above the processing table, is used to fix pipe fittings. The fixing mechanism includes a fixing pipe, three hinge seats fixedly connected to the outer surface of the fixing pipe, hinge rods hinged inside the hinge seats, an outer pipe slidingly limiting its fit on the outer surface of the fixing pipe, and an annular protrusion fixedly connected to the side of the outer pipe near the hinge seats; and... A moving mechanism is disposed on the front of the top of the processing table, and the moving mechanism is used to move the high-frequency sensor to different positions; The hinge rod has a ball-head post at the end away from the hinge seat, and the three hinge seats and three hinge rods are all distributed in a ring on the outer surface of the fixed tube.

[0005] Furthermore, the fixing mechanism includes two fixing plates. A limiting plate is fixedly connected to the bottom of the fixing plate on the right side. A limiting groove is opened on the right side of the top of the processing table. An electric push rod is installed on the top of the processing table. The right output end of the electric push rod is fixedly connected to the left side of the limiting plate. The limiting plate and the limiting groove are in a sliding limiting fit. The limiting groove is U-shaped, and the parts connected to the left and right sides of the two fixing plates are the same.

[0006] Furthermore, a movable groove is provided on the front of the top of the processing table, an adjustment groove is provided on the front of the inner wall of the movable groove, and several locking grooves are provided at the bottom of the adjustment groove. Among them, several of the locking slots are set at equal intervals, and the height of the adjustment slot is greater than the height of the locking slot.

[0007] Furthermore, the right side of the fixing plate located on the left side is fixedly connected to the left side of the fixing tube, and three springs are fixedly connected to the outer surface of the fixing tube. The ends of the three springs that are far apart from each other are respectively fixedly connected to the sides of the three hinge rods that are close to each other. Three anti-rotation grooves are opened on the outer surface of the outer tube. The annular protrusion abuts against the side of the three hinge rods that are close to each other, and the three anti-rotation grooves are distributed in a ring on the outer surface of the outer tube.

[0008] Furthermore, three anti-rotation blocks are fixedly connected to the right side of the outer surface of the fixed tube, and the anti-rotation blocks are slidably limited to the anti-rotation groove. An inner tube is fixedly connected to the right side of the outer tube, and the outer surface of the inner tube is slidably limited to the inner wall of the fixed tube. The three anti-rotation blocks are arranged in a ring on the right side of the outer surface of the fixed tube, and the inner wall of the inner tube is provided with threads.

[0009] Furthermore, a motor is fixedly connected to the left side of the fixed plate located on the left side, and a rotating shaft is fixedly connected to the right output end of the motor. An annular ring is provided on the left side of the outer surface of the rotating shaft, and the rotating shaft is rotatably connected to the inside of the left fixed plate through the annular ring. The outer surface of the shaft is provided with a thread on the right side, and the shaft is connected to the inner wall of the inner tube by the thread on the outer surface.

[0010] Furthermore, a movable box is slidably limited inside the movable slot, the high-frequency sensor is fixedly connected to the inner wall of the movable box, a vertical tube is fixedly connected to the right side of the movable box, a lifting rod is slidably limited inside the vertical tube, a handle is fixedly connected to the top of the lifting rod, two anti-rotation strips are fixedly connected to the outer surface of the lifting rod, two anti-rotation vertical grooves are opened on the top of the movable box, and the anti-rotation strips are slidably limited to the anti-rotation vertical grooves. The movable box has two rollers installed at its bottom. The length of the lifting rod is greater than the length of the vertical tube. The length of the lifting rod is greater than the length of the vertical tube so that the lifting rod can drive the locking block away from the locking groove through the connecting block. The anti-rotation strip and the anti-rotation vertical groove slide limit cooperation can prevent the lifting rod from rotating when it is raised or lowered, and thus prevent the connecting block from rotating.

[0011] Furthermore, a fixing ring is fixedly connected to the outer surface of the lifting rod, a circular groove is opened inside the vertical tube, the fixing ring slides and limits the engagement with the circular groove, a second spring is fixedly connected to the top of the fixing ring, one end of the top of the second spring is fixedly connected to the top of the inner wall of the circular groove, a connecting block is fixedly connected to the bottom of the lifting rod, a locking block is fixedly connected to the bottom of the connecting block, and the locking block is inserted into the locking groove. The connecting block is L-shaped, with one end of its back side contacting the inner wall of the adjusting groove, and the locking block is adapted to the locking groove.

[0012] This utility model has the following beneficial effects: 1. This utility model, through the setting of a fixing mechanism, specifically involves starting an electric push rod to retract, causing the right-side fixing plate to move to the left, so that both ends of the pipe contact the two fixing plates. Then, two motors are started to rotate clockwise, and the left-side motor drives the rotating shaft to rotate, causing the annular protrusion to move to the left, pushing the right ends of the three hinge rods away from each other and into contact with the inner wall of the pipe, thus fixing the left end of the pipe. The right-side motor fixes the right side of the pipe in the same way. After processing, the two motors are started to rotate counterclockwise, causing the two annular protrusions to move closer together, no longer squeezing the hinge rods, thus releasing the fixation. This structure can quickly fix pipes of different lengths and diameters, and can significantly improve the processing efficiency and applicability of the device.

[0013] 2. This utility model features a moving mechanism. Specifically, pulling the handle upward causes the lifting rod to move upward, compressing the second spring and disengaging the locking block from the locking groove. Subsequently, the moving box moves to the right. Once it reaches the desired position, releasing the handle causes the second spring to push the lifting rod downward, allowing the locking block to enter the locking groove and lock the moving box. After processing, lifting the handle causes the locking block to leave the locking groove and enter the adjustment groove, releasing the moving box from its lock position and allowing it to move to the left. This design allows for flexible adjustment of the high-frequency sensor's position to handle different positions of the pipe fittings.

[0014] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the limiting groove structure of this utility model; Figure 3 This is a schematic diagram of the hinge seat structure of this utility model; Figure 4 This is a schematic diagram of the inner tube structure of this utility model; Figure 5 This is a schematic diagram of the overall structure of the mobile mechanism of this utility model; Figure 6 This is a schematic diagram of the anti-rotation vertical groove structure of this utility model; Figure 7 This is a schematic diagram of the lock groove structure of this utility model.

[0017] The attached diagram lists the components represented by each number as follows: 1. Processing table; 11. High-frequency sensor; 2. Fixing mechanism; 21. Fixing plate; 211. Limiting plate; 212. Limiting groove; 213. Electric push rod; 22. Fixing tube; 221. Hinge seat; 222. Hinge rod; 223. Spring one; 23. Outer tube; 231. Anti-rotation groove; 232. Anti-rotation block; 233. Annular protrusion; 24. Inner tube; 25. Motor; 251. Rotating shaft; 3. Moving mechanism; 31. Moving groove; 311. Adjusting groove; 312. Locking groove; 32. Moving box; 321. Vertical tube; 33. Lifting rod; 331. Handle; 332. Anti-rotation strip; 333. Anti-rotation vertical groove; 334. Fixing ring; 335. Circular groove; 336. Spring two; 34. Connecting block; 341. Locking block. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-7 As shown, this utility model is a local heat treatment device for pipe fittings based on high-frequency induction heating, including a processing table 1, a high-frequency inductor 11 disposed above the processing table 1, and further including: Fixing mechanism 2 is located above processing table 1 and is used to fix pipe fittings. Fixing mechanism 2 includes a fixing pipe 22, three hinge seats 221 fixedly connected to the outer surface of the fixing pipe 22, hinge rods 222 hinged inside the hinge seats 221, and an outer pipe 23 slidingly and limitingly fitted to the outer surface of the fixing pipe 22. An annular protrusion 233 is fixedly connected to the side of the outer pipe 23 near the hinge seats 221. The moving mechanism 3 is located on the front of the top of the processing table 1. The moving mechanism 3 is used to move the high-frequency sensor 11 to different positions. The end of the hinge rod 222 away from the hinge seat 221 is provided with a ball head post. The three hinge seats 221 and the three hinge rods 222 are all distributed in a ring on the outer surface of the fixed tube 22.

[0020] The fixing mechanism 2 includes two fixing plates 21. The bottom of the fixing plate 21 on the right side is fixedly connected to a limiting plate 211. A limiting groove 212 is opened on the right side of the top of the processing table 1. An electric push rod 213 is installed on the top of the processing table 1. The right output end of the electric push rod 213 is fixedly connected to the left side of the limiting plate 211. The limiting plate 211 and the limiting groove 212 are in sliding limiting cooperation. The limiting groove 212 is U-shaped. The parts connected to the left and right sides of the two fixing plates 21 are the same.

[0021] The front of the top of the processing table 1 is provided with a moving groove 31, the front of the inner wall of the moving groove 31 is provided with an adjustment groove 311, and the bottom of the adjustment groove 311 is provided with several locking grooves 312; wherein, the several locking grooves 312 are arranged at equal intervals, and the height of the adjustment groove 311 is greater than the height of the locking groove 312.

[0022] The right side of the fixing plate 21 located on the left is fixedly connected to the left side of the fixing tube 22. Three springs 223 are fixedly connected to the outer surface of the fixing tube 22. The ends of the three springs 223 that are far apart from each other are fixedly connected to the sides of the three hinge rods 222 that are close to each other. Three anti-rotation grooves 231 are provided on the outer surface of the outer tube 23. Among them, the annular protrusion 233 abuts against the sides of the three hinge rods 222 that are close to each other. The three anti-rotation grooves 231 are distributed in a ring on the outer surface of the outer tube 23.

[0023] Three anti-rotation blocks 232 are fixedly connected to the right side of the outer surface of the fixed tube 22. The anti-rotation blocks 232 are slidably limited to the anti-rotation groove 231. An inner tube 24 is fixedly connected to the right side of the outer tube 23. The outer surface of the inner tube 24 is slidably limited to the inner wall of the fixed tube 22. The three anti-rotation blocks 232 are distributed in a ring on the right side of the outer surface of the fixed tube 22. The inner wall of the inner tube 24 is provided with threads.

[0024] A motor 25 is fixedly connected to the left side of the fixed plate 21 located on the left side. A rotating shaft 251 is fixedly connected to the output end of the motor 25 on the right side. An annular ring is provided on the left side of the outer surface of the rotating shaft 251, and the rotating shaft 251 is rotatably connected to the inside of the left fixed plate 21 through the annular ring. The right side of the outer surface of the rotating shaft 251 is provided with a thread, and the rotating shaft 251 is threadedly connected to the inner wall of the inner tube 24 through the thread on the outer surface. When the electric push rod 213 is activated to retract, it drives the right fixed plate 21 to move to the left, so that the two ends of the tube contact the two fixed plates 21. Then, the two... Motor 25 rotates clockwise, and the left motor 25 drives the rotating shaft 251 to rotate, causing the annular protrusion 233 to move to the left. This pushes the right ends of the three hinge rods 222 away from each other and into contact with the inner wall of the pipe, thus fixing the left end of the pipe. The right motor 25 fixes the right side of the pipe in the same way. After processing, the two motors 25 are started to rotate counterclockwise, causing the two annular protrusions 233 to move closer to each other and no longer squeeze the hinge rods 222, thus releasing the fixation. This structure can quickly fix pipes of different lengths and diameters, which can significantly improve the processing efficiency and applicability of the device.

[0025] The movable box 32 is slidably limited inside the movable slot 31. The high-frequency sensor 11 is fixedly connected to the inner wall of the movable box 32. The right side of the movable box 32 is fixedly connected to the vertical tube 321. The lifting rod 33 is slidably limited inside the vertical tube 321. The top of the lifting rod 33 is fixedly connected to the handle 331. Two anti-rotation strips 332 are fixedly connected to the outer surface of the lifting rod 33. Two anti-rotation vertical grooves 333 are opened on the top of the movable box 32. The anti-rotation strips 332 and the anti-rotation vertical grooves 333 are slidably limited. Two rollers are installed at the bottom of the movable box 32. The length of the lifting rod 33 is greater than the length of the vertical tube 321.

[0026] A fixing ring 334 is fixedly connected to the outer surface of the lifting rod 33. A circular groove 335 is opened inside the vertical tube 321. The fixing ring 334 slides and limits the engagement with the circular groove 335. A second spring 336 is fixedly connected to the top of the fixing ring 334. One end of the top of the second spring 336 is fixedly connected to the top of the inner wall of the circular groove 335. A connecting block 34 is fixedly connected to the bottom of the lifting rod 33. A locking block 341 is fixedly connected to the bottom of the connecting block 34. The locking block 341 is inserted into the locking groove 312. When the handle 331 is pulled upward, the lifting rod 33 moves upward, the second spring 336 is squeezed, and the locking block 341 is disengaged from the locking groove 312. Then, the moving box 32 is moved to the right. After reaching the position, the handle 331 is released, and the spring 336 pushes the lifting rod 33 to move down. The locking block 341 enters the locking groove 312 to lock the moving box 32. After processing, the handle 331 is lifted, and the locking block 341 leaves the locking groove 312 and enters the adjusting groove 311, releasing the locking of the moving box 32 and moving it to the left. This setting can flexibly adjust the position of the high-frequency sensor 11 to process different positions of the pipe. Among them, the connecting block 34 is L-shaped. One end of the back of the connecting block 34 contacts the inner wall of the adjusting groove 311, and the locking block 341 is adapted to the locking groove 312.

[0027] A specific application of this embodiment is as follows: In use, the left end of the pipe is inserted into the coil of the high-frequency sensor 11, and finally inserted to the outside of the left fixed pipe 22. Then, the electric push rod 213 is activated to retract, driving the limiting plate 211 and the right fixed plate 21 to move to the left. During the movement, the limiting plate 211 slides and limits the movement with the limiting groove 212 to prevent the right fixed plate 21 from tipping over. When both ends of the pipe contact the sides of the two fixed plates 21 that are close to each other, the electric push rod 213 is turned off. At this time, the two motors 25 are started to rotate clockwise. The left motor 25 drives the rotating shaft 251 to rotate together. 251 is threaded to the inner tube 24, and the anti-rotation groove 231 on the outer tube 23 is slidably limited to the anti-rotation block 232. Therefore, the inner tube 24 will drive the annular protrusion 233 to move to the left. The leftward movement of the annular protrusion 233 will push the hinge rod 222 to rotate around the pin at the left end. At this time, the spring 223 is stretched, and the right ends of the three hinge rods 222 move away from each other. During the rotation of the three hinge rods 222, when the ball head column at the right end of the three hinge rods 222 is in close contact with the inner wall of the pipe, the left motor 25 is turned off. At this time, the left end of the pipe is fixed. At the same time, the right motor 25 will fix the right side of the pipe in the same way. Then, pull the handle 331 upwards. The lifting rod 33, the fixing ring 334, and the connecting block 34 will move upwards together. At this time, the second spring 336 is compressed, and the locking block 341 has left the locking groove 312. Then, the moving box 32 can be moved to the right, with its bottom rollers assisting in the movement. At the same time, the high-frequency sensor 11 inside the moving box 32 will move together. When it reaches the part that needs to be heated, release the handle 331. The second spring 336 will push the fixing ring 334 and the lifting rod 33 downwards through its own elasticity. At this time, the locking block 341 re-enters the locking groove 312, locking the moving box 32. During the movement of the lifting rod 33, the anti-rotation strip 332 and the anti-rotation vertical groove 333 slide and limit each other to prevent the lifting rod 33 from rotating. At this time, the high-frequency sensor 11 can be opened. A high-frequency power supply inputs an alternating current to the induction coil, generating an alternating magnetic field on the surface of the pipe. Through the Joule heating effect, the local temperature rises rapidly. After processing, the handle 331 is lifted, and the locking block 341 leaves the locking groove 312 and enters the adjusting groove 311, releasing the lock of the moving box 32 and moving it to the left. Then, the two motors 25 are started to rotate counterclockwise, and the left rotating shaft 251 will drive the left inner tube 24 to move to the right. At this time, the three hinge rods 222 lose the pressure of the annular protrusion 233, and the three springs 223 will pull the right ends of the three hinge rods 222 closer to each other, releasing the fixation on the left side of the pipe. At the same time, the right side of the pipe will be released in the same way. Then, the electric push rod 213 can be started to push the right fixing plate 21 to the right and remove the pipe.

[0028] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A device for local heat treatment of pipe fittings based on high-frequency induction heating, comprising a processing table, wherein a high-frequency inductor is disposed above the processing table, characterized in that, Also includes: A fixing mechanism, positioned above the processing table, is used to fix pipe fittings. The fixing mechanism includes a fixing pipe, three hinge seats fixedly connected to the outer surface of the fixing pipe, hinge rods hinged inside the hinge seats, an outer pipe slidingly limiting its fit on the outer surface of the fixing pipe, and an annular protrusion fixedly connected to the side of the outer pipe near the hinge seats; and... A moving mechanism is disposed on the front of the top of the processing table, and the moving mechanism is used to move the high-frequency sensor to different positions; The hinge rod has a ball-head post at the end away from the hinge seat, and the three hinge seats and three hinge rods are all distributed in a ring on the outer surface of the fixed tube.

2. The device for local heat treatment of pipe fittings based on high-frequency induction heating according to claim 1, characterized in that, The fixing mechanism includes two fixing plates. A limiting plate is fixedly connected to the bottom of the fixing plate on the right side. A limiting groove is opened on the right side of the top of the processing table. An electric push rod is installed on the top of the processing table. The right output end of the electric push rod is fixedly connected to the left side of the limiting plate. The limiting plate and the limiting groove are in a sliding limiting fit. The limiting groove is U-shaped, and the parts connected to the left and right sides of the two fixing plates are the same.

3. The device for local heat treatment of pipe fittings based on high-frequency induction heating according to claim 1, characterized in that, The front of the top of the processing table is provided with a moving groove, the front of the inner wall of the moving groove is provided with an adjustment groove, and the bottom of the adjustment groove is provided with several locking grooves. Among them, several of the locking slots are set at equal intervals, and the height of the adjustment slot is greater than the height of the locking slot.

4. The device for local heat treatment of pipe fittings based on high-frequency induction heating according to claim 2, characterized in that, The right side of the fixing plate located on the left side is fixedly connected to the left side of the fixing tube. Three springs are fixedly connected to the outer surface of the fixing tube. The ends of the three springs that are far apart from each other are fixedly connected to the sides of the three hinge rods that are close to each other. Three anti-rotation grooves are opened on the outer surface of the outer tube. The annular protrusion abuts against the side of the three hinge rods that are close to each other, and the three anti-rotation grooves are distributed in a ring on the outer surface of the outer tube.

5. A local heat treatment device for pipe fittings based on high-frequency induction heating according to claim 4, characterized in that, Three anti-rotation blocks are fixedly connected to the right side of the outer surface of the fixed tube. The anti-rotation blocks are slidably limited to the anti-rotation groove. An inner tube is fixedly connected to the right side of the outer tube. The outer surface of the inner tube is slidably limited to the inner wall of the fixed tube. The three anti-rotation blocks are arranged in a ring on the right side of the outer surface of the fixed tube, and the inner wall of the inner tube is provided with threads.

6. A local heat treatment device for pipe fittings based on high-frequency induction heating according to claim 5, characterized in that, A motor is fixedly connected to the left side of the fixed plate located on the left side, and a rotating shaft is fixedly connected to the right output end of the motor. An annular ring is provided on the left side of the outer surface of the rotating shaft, and the rotating shaft is rotatably connected to the inside of the left fixed plate through the annular ring. The outer surface of the shaft is provided with a thread on the right side, and the shaft is connected to the inner wall of the inner tube by the thread on the outer surface.

7. A local heat treatment device for pipe fittings based on high-frequency induction heating according to claim 3, characterized in that, The movable slot is fitted with a movable box that slides within it. The high-frequency sensor is fixedly connected to the inner wall of the movable box. A vertical tube is fixedly connected to the right side of the movable box. A lifting rod is fitted with a sliding limit inside the vertical tube. A handle is fixedly connected to the top of the lifting rod. Two anti-rotation strips are fixedly connected to the outer surface of the lifting rod. Two anti-rotation vertical slots are provided on the top of the movable box. The anti-rotation strips slide within the anti-rotation vertical slots. The movable box has two rollers installed at its bottom, and the length of the lifting rod is greater than the length of the vertical tube.

8. A local heat treatment device for pipe fittings based on high-frequency induction heating according to claim 7, characterized in that, A fixing ring is fixedly connected to the outer surface of the lifting rod. A circular groove is opened inside the vertical tube. The fixing ring slides and limits the movement of the circular groove. A second spring is fixedly connected to the top of the fixing ring. One end of the top of the second spring is fixedly connected to the top of the inner wall of the circular groove. A connecting block is fixedly connected to the bottom of the lifting rod. A locking block is fixedly connected to the bottom of the connecting block. The locking block is inserted into the locking groove. The connecting block is L-shaped, with one end of its back side contacting the inner wall of the adjusting groove, and the locking block is adapted to the locking groove.

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