Quenching device for steel circular pipe machining

Abstract

The utility model relates to the technical field of steel pipe quenching, and discloses a quenching device for processing a steel circular pipe, which comprises an operation box, a support frame is fixedly arranged on the back of the operation box, and a transverse plate is fixedly arranged on the inner wall of the support frame; the moving mechanism is fixedly mounted at the top of the transverse plate; and the rotating mechanism is arranged above the operation box and is fixedly connected with the moving mechanism. Compared with a traditional device, by arranging the lifting mechanism, the heating process of the steel round pipe is more flexible and accurate in the heating process of the steel round pipe, the lifting speed and height of the moving block can be accurately controlled by adjusting the rotating speed and direction of the first motor, and therefore the requirement for heating the steel round pipe at different positions is met; due to the fact that the moving block can be rapidly lifted to the designated position, the distance between the steel round pipe and the heating source can be rapidly adjusted, unnecessary waiting time in the heating process is shortened, and therefore production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe quenching, and more specifically, to a quenching device for processing steel round pipes. Background Art

[0002] Quenching is one of the metal heat treatment processes. Quenching is to heat the metal product to a certain temperature and then quickly cool it in water, oil or air to improve the hardness and strength of the metal. Quenching is also a common process for heat treatment of steel pipes. At present, the quenching of steel pipes is often done by heating the steel pipes to a certain temperature and then quickly cooling them in water. However, for steel pipes with smaller diameters, if they are quickly cooled in water after heating, they are prone to deformation, distortion and even cracking. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a quenching device for processing steel round pipes, which has the advantages of uniform heating and stable clamping.

[0004] To achieve the above object, the utility model provides the following technical solution: a quenching device for processing steel round pipes, comprising an operating box, a support frame is fixedly installed on the back of the operating box, and a horizontal plate is fixedly installed on the inner wall of the support frame;

[0005] The moving mechanism is fixedly mounted on the top of the horizontal plate;

[0006] The rotating mechanism is arranged above the operating box and is fixedly connected to the moving mechanism;

[0007] Among them, the moving mechanism includes a motor 1 fixedly installed on the top of the horizontal plate, a gear 1 is fixedly installed on the output shaft of the motor 1, a threaded rod is rotatably installed on the top of the horizontal plate, the threaded rod passes through the middle of the support frame and is rotatably connected to the top inner wall of the support frame, a gear 2 is fixedly installed on the outer wall of the threaded rod, the gear 2 is meshed with the gear 1, and a moving block is threadedly sleeved on the outer wall of the threaded rod.

[0008] As a preferred technical solution of the utility model, a clamping box is fixedly installed on the front of the moving block, and the clamping box is a hollow cavity structure. A rotating block is rotatably installed inside the clamping box, and a circular groove is opened inside the rotating block;

[0009] The clamping mechanism is fixedly mounted on the inner wall of the circular groove;

[0010] Among them, the clamping mechanism includes a hydraulic cylinder fixedly installed on the inner wall of the circular groove, a rectangular block is fixedly installed on the inner wall of the circular groove, the output shaft of the hydraulic cylinder passes through the rectangular block and is slidably connected to the rectangular block, a push plate is fixedly installed on the output shaft of the hydraulic cylinder, two clamping blocks are intersectingly installed on the inner wall of the rectangular block, and the push plate passes through the two clamping blocks and is slidably connected to the two clamping blocks.

[0011] As a preferred technical solution of the utility model, a limiting slide bar is fixedly installed on the top of the horizontal plate, the limiting slide bar passes through the middle part of the support frame and is fixedly connected to the top inner wall of the support frame, and the limiting slide bar passes through the moving block and is slidably connected to the moving block.

[0012] As a preferred technical solution of the utility model, the rotating mechanism includes a power component and a rotating component, the power component is fixedly installed on the clamping box on the front side of the moving block, a protective shell is fixedly installed on the top of the clamping box, a motor 2 is fixedly installed on the bottom inner wall of the protective shell, and a gear 3 is fixedly installed on the output shaft of the motor 2.

[0013] As a preferred technical solution of the utility model, the rotating assembly includes two fixed blocks fixedly mounted on the outer wall of the clamping box, a rotating rod is rotatably mounted on one side of the two fixed blocks close to each other, the top of the rotating rod extends into the protective shell and is rotatably connected to the protective shell, gear four and gear five are fixedly mounted on the outer wall of the rotating rod, gear four is meshed with gear three, a rectangular groove is opened on the outer wall of the clamping box, and gear five is meshed with the teeth.

[0014] As a preferred technical solution of the utility model, limiting grooves are respectively opened on the outer walls of the two push plates, and the two limiting grooves respectively penetrate the corresponding push plates. Two limiting blocks are fixedly installed on the top and bottom of the rectangular block, and the limiting grooves are adapted to the limiting blocks.

[0015] As a preferred technical solution of the utility model, it also includes:

[0016] The quenching mechanism is fixedly installed on the top of the operating box;

[0017] Among them, the quenching mechanism includes a fixed frame fixedly installed on the top of the operation box, an annular nozzle is fixedly installed on the inner wall of the fixed frame, a funnel groove is fixedly installed on the inner wall of the operation box, a filter is slidably installed on the inner wall of the operation box, a water tank is fixedly installed on the bottom inner wall of the operation box, a hollow tube is fixedly installed on the right side of the water tank, the hollow tube extends outside the operation box and is fixedly connected to the annular nozzle, and an eddy current heating coil is fixedly installed on the front of the support frame.

[0018] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0019] 1. The utility model starts motor 1, and the output shaft of motor 1 drives gear 1 to rotate, gear 1 meshes with gear 2 to drive gear 2 to rotate, gear 2 drives the threaded rod to rotate, and the threaded rod drives the moving block to move in the vertical direction. Compared with the traditional device, the lifting mechanism is set up, so that the heating process of the steel round pipe is more flexible and accurate during the heating of the steel round pipe. By adjusting the speed and direction of motor 1, the lifting speed and height of the moving block can be accurately controlled, so as to realize the heating requirements of the steel round pipe at different positions, greatly improving the accuracy and controllability of heating. The design of the lifting mechanism improves the heating efficiency. Since the moving block can be quickly lifted to the specified position, the distance between the steel round pipe and the heating source can be quickly adjusted, reducing unnecessary waiting time during the heating process, thereby improving production efficiency.

[0020] 2. The utility model starts the hydraulic cylinder, and the output shaft of the hydraulic cylinder telescopes to drive the push plate to move together. The push plate drives the two clamping blocks to move closer to or away from each other, thereby achieving the purpose of three-point clamping. Compared with the traditional device, through three-point clamping, the steel round tube can obtain more uniform force during the processing process, reducing the deviation or deformation caused by unstable clamping. At the same time, the telescopic movement of the hydraulic cylinder makes it possible to adjust the clamping force as needed, so as to adapt to steel round tube workpieces of different sizes and weights, thereby improving the flexibility and practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of the support frame of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the clamping box of the utility model;

[0024] Figure 4 This is a schematic diagram of the internal structure of the protective shell of the utility model;

[0025] Figure 5 This is a schematic diagram of the partial explosion structure of the utility model;

[0026] Figure 6 This is a schematic diagram of the side sectional structure of the clamping box of the utility model;

[0027] Figure 7 This is a schematic diagram of the internal structure of the operating box of the utility model.

[0028] In the figure: 1. operating box; 2. supporting frame; 3. horizontal plate; 4. motor 1; 5. gear 1; 6. gear 2; 7. threaded rod; 8. limit slide bar; 9. moving block; 10. clamping box; 11. protective shell; 12. motor 2; 13. gear 3; 14. fixed block; 15. rotating rod; 16. gear 4; 17. gear 5; 18. circular groove; 19. hydraulic cylinder; 20. rectangular block; 21. push plate; 22. clamping block; 23. limit groove; 24. limit block; 25. funnel groove; 26. filter screen; 27. water tank; 28. hollow pipe; 29. ​​fixed frame; 30. eddy current heating coil; 31. annular nozzle; 32. rotating block; 33. teeth; 34. rectangular groove. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] like Figures 1 to 7 As shown, the utility model provides a quenching device for processing steel round pipes, comprising an operating box 1, a support frame 2 is fixedly installed on the back of the operating box 1, and a horizontal plate 3 is fixedly installed on the inner wall of the support frame 2;

[0031] The moving mechanism is fixedly mounted on the top of the horizontal plate 3;

[0032] The rotating mechanism is arranged above the operation box 1 and is fixedly connected to the moving mechanism;

[0033] Among them, the moving mechanism includes a motor 4 fixedly installed on the top of the horizontal plate 3, a gear 5 is fixedly installed on the output shaft of the motor 4, a threaded rod 7 is rotatably installed on the top of the horizontal plate 3, the threaded rod 7 passes through the middle of the support frame 2 and is rotatably connected to the top inner wall of the support frame 2, a gear 2 6 is fixedly installed on the outer wall of the threaded rod 7, the gear 2 6 is meshed with the gear 1 5, and a moving block 9 is threadedly sleeved on the outer wall of the threaded rod 7.

[0034] By starting motor 14, the output shaft of motor 14 drives gear 15 to rotate, gear 15 meshes with gear 26 to drive gear 26 to rotate, gear 26 drives threaded rod 7 to rotate, and threaded rod 7 drives moving block 9 to move in the vertical direction. Compared with the traditional device, by setting the lifting mechanism, the heating process of the steel round tube is made more flexible and precise during the heating of the steel round tube. By adjusting the speed and direction of motor 14, the lifting speed and height of moving block 9 can be accurately controlled, so as to realize the heating requirements of steel round tubes at different positions, which greatly improves the accuracy and controllability of heating. The design of the lifting mechanism improves the heating efficiency. Since the moving block 9 can be quickly lifted to the specified position, the distance between the steel round tube and the heating source can be quickly adjusted, which reduces unnecessary waiting time during the heating process and improves production efficiency.

[0035] The staff first fixes the steel round tube, and then starts the motor 4. The output shaft of the motor 4 drives the gear 5 to rotate. The gear 15 is engaged with the gear 2 6 to drive the gear 2 6 to rotate. The gear 2 6 drives the threaded rod 7 to rotate. The threaded rod 7 drives the moving block 9 to move in the vertical direction. The moving block 9 drives the clamping box 10 to move together. At the same time, start the motor 2 12. The output shaft of the motor 2 12 drives the gear 3 13 to rotate together. The gear 3 13 is engaged with the gear 4 16 to drive the gear 4 16 to rotate. The gear 4 16 drives the rotating rod 15 to rotate. The rotating rod 15 drives the gear 5 17 to rotate. The gear 5 17 is engaged with the teeth 33 to drive the teeth 33 and the rotating block 32 to rotate, so that the steel round tube can rotate and move in the vertical direction at the same time.

[0036] Among them, a clamping box 10 is fixedly installed on the front of the moving block 9, and the clamping box 10 is a hollow cavity structure. A rotating block 32 is rotatably installed inside the clamping box 10, and a circular groove 18 is opened inside the rotating block 32;

[0037] The clamping mechanism is fixedly mounted on the inner wall of the circular groove 18;

[0038] Among them, the clamping mechanism includes a hydraulic cylinder 19 fixedly installed on the inner wall of the circular groove 18, a rectangular block 20 is fixedly installed on the inner wall of the circular groove 18, the output shaft of the hydraulic cylinder 19 passes through the rectangular block 20 and is slidably connected to the rectangular block 20, a push plate 21 is fixedly installed on the output shaft of the hydraulic cylinder 19, two clamping blocks 22 are installed at the inner wall of the rectangular block 20, and the push plate 21 passes through the two clamping blocks 22 and is slidably connected to the two clamping blocks 22.

[0039] By starting the hydraulic cylinder 19, the output shaft of the hydraulic cylinder 19 telescopes and drives the push plate 21 to move together, and the push plate 21 drives the two clamping blocks 22 to move closer to or away from each other, thereby achieving the purpose of three-point clamping. Compared with the traditional device, through three-point clamping, the steel round tube can obtain more uniform force during the processing process, reducing the deviation or deformation caused by unstable clamping. At the same time, the telescopic movement of the hydraulic cylinder makes it possible to adjust the clamping force as needed, so as to adapt to steel round tube workpieces of different sizes and weights, thereby improving the flexibility and practicality of the device.

[0040] Before the staff carries out the quenching operation of the steel round tube, they first place the steel round tube at the designated position and start the hydraulic cylinder 19. The output shaft of the hydraulic cylinder 19 begins to extend and retract, driving the synchronous movement of the push plate 21. Driven by the hydraulic cylinder 19, the push plate 21 drives the two clamping blocks 22 to move closer to each other. When the two clamping blocks 22 gradually approach the steel round tube, they contact the outer surface of the steel round tube and exert a certain clamping force. At the same time, the push plate 21 is also close to the steel round tube, so that the steel round tube is in contact with the push plate 21 and the two clamping blocks 22 at three points, thereby ensuring the stability of the steel round tube during the quenching process.

[0041] Among them, a limiting slide bar 8 is fixedly installed on the top of the cross plate 3, the limiting slide bar 8 passes through the middle of the support frame 2 and is fixedly connected to the top inner wall of the support frame 2, and the limiting slide bar 8 passes through the moving block 9 and is slidably connected to the moving block 9.

[0042] By setting the limiting slide bar 8, when the moving block 9 moves, the limiting slide bar 8 can provide additional support and fixation, reduce the shaking and vibration of the moving block 9, and can also effectively limit the moving block 9 during its movement, thereby maintaining the stable operation of the entire device and improving the stability of the device.

[0043] Among them, the rotating mechanism includes a power component and a rotating component. The power component is fixedly installed on the clamping box 10 on the front of the moving block 9. A protective shell 11 is fixedly installed on the top of the clamping box 10. A motor 2 12 is fixedly installed on the bottom inner wall of the protective shell 11. A gear 3 13 is fixedly installed on the output shaft of the motor 2 12.

[0044] By starting the motor 2 12, the output shaft of the motor 2 12 drives the gear 3 13 to rotate together. The close cooperation between the output shaft of the motor 2 12 and the gear 3 13 also ensures the stability and accuracy of power transmission, providing power support for the rotating mechanism.

[0045] Among them, the rotating assembly includes two fixed blocks 14 fixedly installed on the outer wall of the clamping box 10, and a rotating rod 15 is rotatably installed on the side of the two fixed blocks 14 close to each other. The top of the rotating rod 15 extends into the protective shell 11 and is rotatably connected to the protective shell 11. Gear four 16 and gear five 17 are fixedly installed on the outer wall of the rotating rod 15. Gear four 16 is meshed with gear three 13. A rectangular groove 34 is opened on the outer wall of the clamping box 10, and gear five 17 is meshed with the tooth 33.

[0046] By rotating gear three 13, gear three 13 meshes with gear four 16 to drive gear four 16 to rotate, gear four 16 drives rotating rod 15 to rotate, rotating rod 15 drives gear five 17 to rotate, gear five 17 meshes with teeth 33 to drive teeth 33 and rotating block 32 to rotate. Compared with the traditional device, when performing the steel round tube quenching process, the steel round tube is rotated while heating and cooling operations are performed. The rotating heating and cooling method makes the surface of the steel round tube heated more evenly. In the traditional fixed heating and cooling process, some parts of the steel round tube may produce temperature differences due to uneven heating, resulting in inconsistent quenching effects. By rotating the steel round tube, it can be ensured that the heating and cooling media act evenly on various parts of the steel round tube, thereby improving the quenching quality and consistency.

[0047] The outer walls of the two push plates 21 are provided with limiting grooves 23 , which penetrate the corresponding push plates 21 . The top and bottom of the rectangular block 20 are respectively fixed with two limiting blocks 24 , which are matched with the limiting grooves 23 .

[0048] By setting the limit groove 23 and the limit block 24, the stability and accuracy of the push plate 21 during movement are ensured. When the push plate 21 moves closer to or away from each other under the drive of the hydraulic cylinder 19, the limit block 24 will slide along the limit groove 23. This sliding constrains the movement trajectory of the push plate 21 and prevents the push plate 21 from deflecting or shaking during movement, thereby ensuring the stability and accuracy of clamping the steel round tube.

[0049] Among them, also include;

[0050] The quenching mechanism is fixedly installed on the top of the operation box 1;

[0051] Among them, the quenching mechanism includes a fixed frame 29 fixedly installed on the top of the operation box 1, an annular nozzle 31 is fixedly installed on the inner wall of the fixed frame 29, a funnel groove 25 is fixedly installed on the inner wall of the operation box 1, a filter screen 26 is slidably installed on the inner wall of the operation box 1, a water tank 27 is fixedly installed on the bottom inner wall of the operation box 1, a hollow tube 28 is fixedly installed on the right side of the water tank 27, the hollow tube 28 extends to the outside of the operation box 1 and is fixedly connected to the annular nozzle 31, and an eddy current heating coil 30 is fixedly installed on the front of the support frame 2.

[0052] The design of the annular nozzle 31 allows the cooling medium to be evenly sprayed on the surface of the steel round pipe. The setting of the funnel 25 helps to collect the cooling medium in the operating box 1 to prevent it from scattering everywhere. The sliding installation design of the filter 26 allows it to be easily taken out and cleaned, thereby maintaining the cleanliness of the cooling medium. The water tank 27 serves as a storage and supply device for the cooling medium. The hollow tube 28 extends outside the operating box 1, which is convenient for connection with the external cooling system, thereby realizing the recycling and temperature control of the cooling medium. This design not only improves the quenching efficiency, but also reduces energy consumption.

[0053] The working principle and use process of this utility model:

[0054] The staff first fixes the steel round tube, and then starts the motor 4. The output shaft of the motor 4 drives the gear 5 to rotate. The gear 15 is engaged with the gear 2 6 to drive the gear 2 6 to rotate. The gear 2 6 drives the threaded rod 7 to rotate. The threaded rod 7 drives the moving block 9 to move in the vertical direction. The moving block 9 drives the clamping box 10 to move together. At the same time, start the motor 2 12. The output shaft of the motor 2 12 drives the gear 3 13 to rotate together. The gear 3 13 is engaged with the gear 4 16 to drive the gear 4 16 to rotate. The gear 4 16 drives the rotating rod 15 to rotate. The rotating rod 15 drives the gear 5 17 to rotate. The gear 5 17 is engaged with the teeth 33 to drive the teeth 33 and the rotating block 32 to rotate, so that the steel round tube can rotate and move in the vertical direction at the same time.

[0055] Before the staff carries out the quenching operation of the steel round tube, they first place the steel round tube at the designated position and start the hydraulic cylinder 19. The output shaft of the hydraulic cylinder 19 begins to extend and retract, driving the synchronous movement of the push plate 21. Driven by the hydraulic cylinder 19, the push plate 21 drives the two clamping blocks 22 to move closer to each other. When the two clamping blocks 22 gradually approach the steel round tube, they contact the outer surface of the steel round tube and exert a certain clamping force. At the same time, the push plate 21 is also close to the steel round tube, so that the steel round tube is in contact with the push plate 21 and the two clamping blocks 22 at three points, thereby ensuring the stability of the steel round tube during the quenching process.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quenching device for processing steel round pipes, comprising an operating box (1), characterized in that: A support frame (2) is fixedly mounted on the back of the operation box (1), and a transverse plate (3) is fixedly mounted on the inner wall of the support frame (2); A moving mechanism, fixedly mounted on the top of the horizontal plate (3); The rotating mechanism is arranged above the operating box (1) and is fixedly connected to the moving mechanism; The moving mechanism comprises a motor 1 (4) fixedly mounted on the top of the horizontal plate (3), a gear 1 (5) fixedly mounted on the output shaft of the motor 1 (4), a threaded rod (7) rotatably mounted on the top of the horizontal plate (3), the threaded rod (7) passing through the middle of the support frame (2) and rotatably connected to the top inner wall of the support frame (2), a gear 2 (6) fixedly mounted on the outer wall of the threaded rod (7), the gear 2 (6) meshing with the gear 1 (5), and a moving block (9) threadedly sleeved on the outer wall of the threaded rod (7).

2. A quenching device for processing steel round pipes according to claim 1, characterized in that: A clamping box (10) is fixedly mounted on the front of the moving block (9), the clamping box (10) is in a hollow cavity structure, a rotating block (32) is rotatably mounted inside the clamping box (10), and a circular groove (18) is provided inside the rotating block (32); A clamping mechanism, fixedly mounted on the inner wall of the circular groove (18); The clamping mechanism comprises a hydraulic cylinder (19) fixedly mounted on the inner wall of a circular groove (18); a rectangular block (20) is fixedly mounted on the inner wall of the circular groove (18); an output shaft of the hydraulic cylinder (19) passes through the rectangular block (20) and is slidably connected to the rectangular block (20); a push plate (21) is fixedly mounted on the output shaft of the hydraulic cylinder (19); two clamping blocks (22) are intersectingly mounted on the inner wall of the rectangular block (20); the push plate (21) passes through the two clamping blocks (22) and is slidably connected to the two clamping blocks (22).

3. A quenching device for processing steel round pipes according to claim 1, characterized in that: A limiting slide bar (8) is fixedly installed on the top of the transverse plate (3); the limiting slide bar (8) passes through the middle of the support frame (2) and is fixedly connected to the top inner wall of the support frame (2); the limiting slide bar (8) passes through the moving block (9) and is slidably connected to the moving block (9).

4. The quenching device for processing steel round pipes according to claim 1, characterized in that: The rotating mechanism comprises a power assembly and a rotating assembly, wherein the power assembly is fixedly mounted on a clamping box (10) on the front side of the moving block (9), a protective shell (11) is fixedly mounted on the top of the clamping box (10), a motor 2 (12) is fixedly mounted on the bottom inner wall of the protective shell (11), and a gear 3 (13) is fixedly mounted on the output shaft of the motor 2 (12).

5. A quenching device for processing steel round pipes according to claim 4, characterized in that: The rotating assembly comprises two fixed blocks (14) fixedly mounted on the outer wall of the clamping box (10); a rotating rod (15) is rotatably mounted on one side of the two fixed blocks (14) close to each other; the top end of the rotating rod (15) extends into the protective shell (11) and is rotatably connected to the protective shell (11); a gear four (16) and a gear five (17) are fixedly mounted on the outer wall of the rotating rod (15); the gear four (16) is meshed with the gear three (13); a rectangular groove (34) is provided on the outer wall of the clamping box (10); the gear five (17) is meshed with the teeth (33).

6. A quenching device for processing steel round tubes according to claim 2, characterized in that: The outer walls of the two push plates (21) are respectively provided with limit grooves (23), and the two limit grooves (23) respectively penetrate the corresponding push plates (21). The top and bottom of the rectangular block (20) are respectively fixedly mounted with two limit blocks (24), and the limit grooves (23) are adapted to the limit blocks (24).

7. The quenching device for processing steel round tubes according to claim 1, characterized in that: Also includes; A quenching mechanism, fixedly mounted on the top of the operating box (1); The quenching mechanism comprises a fixing frame (29) fixedly mounted on the top of the operating box (1), an annular nozzle (31) fixedly mounted on the inner wall of the fixing frame (29), a funnel groove (25) fixedly mounted on the inner wall of the operating box (1), a filter screen (26) slidably mounted on the inner wall of the operating box (1), a water tank (27) fixedly mounted on the bottom inner wall of the operating box (1), a hollow tube (28) fixedly mounted on the right side of the water tank (27), the hollow tube (28) extending outside the operating box (1) and fixedly connected to the annular nozzle (31), and an eddy current heating coil (30) fixedly mounted on the front of the support frame (2).

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