Stainless steel pipe fitting heat treatment device

Abstract

A stainless steel pipe fitting heat treatment device relates to the field of martensitic stainless steel heat treatment, recess is arranged in mesa I, extension plate on both sides of the recess is provided with a long shaft, each long shaft is respectively rotatably installed with connecting head I and connecting head II, connecting head I is fixedly integrated with heating induction coil I, connecting head II is fixedly integrated with heating induction coil II, that is, two heating induction coils I and two heating induction coils II are arranged in the recess of mesa I, and the coaxial center of the heating induction coil I and the heating induction coil II is coaxial; the cooling of the present application adopts the spraying mode, the spray head is provided with a plurality of water outlet modes, the flow can be adjusted according to the size and cooling requirement of the pipe fitting, and the spraying system is provided with a plurality of groups, the water quantity of each rear group is correspondingly reduced, the cooling intensity is gradually reduced, and the pipe fitting is prevented from being deformed or cracked due to the excessive cooling speed.

Description

Technical Field

[0001] This invention relates to the field of heat treatment technology for martensitic stainless steel, and particularly to a heat treatment apparatus for stainless steel pipe fittings. Background Technology

[0002] Heat treatment of martensitic stainless steel is an important process that involves a series of operations, including heating and cooling, to alter its internal microstructure and thus regulate its material properties. During quenching, the martensitic stainless steel is heated to its austenitizing temperature and held for a certain time to completely transform the microstructure into austenite. It is then rapidly cooled, typically by water or oil quenching, to further transform the austenite into martensite, significantly improving the material's hardness and strength.

[0003] Heat treatment of martensitic stainless steel is of great significance. In the industrial sector, many components with stringent requirements for strength and wear resistance rely on martensitic stainless steel, such as cutting tools, bearings, valves, and pipe fittings. Through proper heat treatment, these components can achieve excellent mechanical properties, meet the demands of complex operating conditions, extend their service life, and reduce replacement costs. In the aerospace field, where the performance requirements for materials are extremely demanding, martensitic stainless steel, after precise heat treatment, can meet the comprehensive requirements of high strength, high wear resistance, and good corrosion resistance for critical components such as aero-engine parts, ensuring flight safety.

[0004] Despite significant progress in the heat treatment technology of martensitic stainless steel, some shortcomings remain. Precise control of parameters such as temperature, time, and cooling rate during heat treatment presents challenges. Even minor parameter deviations can lead to incomplete or uneven microstructural transformation, thus affecting the material's performance stability. Excessively high quenching temperatures or excessively rapid cooling rates can cause defects such as cracking. Furthermore, for workpieces of varying sizes, uneven temperature distribution can easily occur during heat treatment. Thicker-walled pipes experience slower internal heating rates, resulting in differences in microstructure and properties across different areas, impacting the overall product quality. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention discloses a heat treatment device for stainless steel pipe fittings, which effectively solves the problems in the background art. In use, this invention employs electromagnetic induction coil heating to heat the stainless steel pipe fittings. It utilizes two sets of heating induction coils (two small-diameter and two large-diameter), allowing for simultaneous heating of pipe fittings of different diameters and enabling their combined use. Each set of heating coils can be independently controlled, participating or not participating in the heating process. For pipe fittings with thicker walls, two sets of heating coils of the same diameter can be used simultaneously to rapidly raise the internal temperature of the pipe fitting. For pipe fittings with thinner walls, only one corresponding diameter coil is needed. The heating coil with a diameter of 1 mm can heat quickly, and the heating method is flexible and adaptable. The cooling of this invention adopts a spray method. The spray head is preset with multiple water outlet modes, and the flow rate can be adjusted according to the size of the pipe and the cooling requirements. The spray system has multiple groups, and the water volume of each group is reduced accordingly to gradually reduce the cooling intensity and avoid deformation or cracking of the pipe due to excessive cooling speed. All spray frames can be adjusted synchronously. For pipes of different sizes, the flow rate of all spray frames can be reduced or increased. The multi-stage spray cooling system can more accurately control the cooling speed and cooling uniformity, improve cooling efficiency, and reduce the amount of cooling medium used, thereby reducing production costs.

[0006] A heat treatment apparatus for stainless steel pipe fittings relates to the field of heat treatment of martensitic stainless steel. A groove is provided in the center of a table I, and long shafts are provided on the extension plates on both sides of the groove. Each long shaft is rotatably mounted with a connector I and a connector II. A heating induction coil I is fixedly integrated on connector I, and a heating induction coil II is fixedly integrated on connector II. That is, there are two heating induction coils I and two heating induction coils II in the groove in the center of table I, and the heating induction coils I and II are coaxial. A stop bar is also fixedly installed on the extension plates of table I. The stop bar contacts the convex shafts in the center of connectors I and II, limiting the movement of connectors I and II.

[0007] Preferably, a flat gear is movably mounted on the long shaft of the extension plate on the platform I. Two levers are symmetrically mounted on both sides of the flat gear. The levers are engaged in the gap at the upper edge of connector I and connector II. Two symmetrical arc-shaped grooves are also provided on both sides of the flat gear. Limiting clips are slidably mounted in the arc-shaped grooves. Two round holes are provided on the outer end of the limiting clips. The round holes are slidably connected to the slide rails on both sides of the platform I. A lead screw is rotatably mounted on the extension plates on both sides of the platform I. The lead screw is threadedly connected to the limiting clip. At the same time, one end of the lead screw is also connected to the motor shaft of stepper motor I. Stepper motor I is fixedly mounted on the extension plates on both sides of the platform I.

[0008] Preferably, long gears are rotatably mounted on the extension plates on both sides of the tabletop I. The long gears mesh with the flat gears, and one end of the long gears is connected to the motor shaft of the stepper motor II. The stepper motor II is fixedly mounted on the extension plates.

[0009] Preferably, two sliding rods are fixedly installed under the platform I, and a base plate is fixedly installed under the sliding rods. A hydraulic cylinder is fixedly installed at the middle position under the base plate. The piston rod of the hydraulic cylinder is fixedly connected to the bottom of the lifting frame. The lifting frame extends through the slot on the platform I to the top of the platform I. At the same time, rollers are rotatably installed on the top of the lifting frame, and the rollers are driven by a built-in motor.

[0010] Preferably, side panels are fixedly installed on both sides of the countertop II. Each side panel has multiple round holes, and a water inlet pipe is fixedly installed in each round hole. One end of the water inlet pipe is sealed, and the other end is connected to a transition pipe. Multiple equally spaced round holes are provided below the water inlet pipe. A spray frame is also rotatably installed outside the water inlet pipe. The inner wall of the spray frame is circular, and the outer wall is square. Each surface of the outer wall has equally spaced nozzles. The distance between the nozzles is the same as the distance between the round holes below the water inlet pipe and corresponds to each other. Moreover, the shape of the nozzles on each surface of the outer wall of the water inlet pipe is different, and the amount of water sprayed is also different.

[0011] Preferably, the transition pipes are centrally installed on the integrated head, which provides centralized water supply; a right-angle bracket is provided on the side plate, and a stepper motor III is fixedly installed on the right-angle bracket. The motor gear of the stepper motor III meshes with the upward rack on the rack frame. The rack frame is slidably installed on the slide rail on the side plate. At the same time, the downward rack on the rack frame meshes with multiple driven gears, so that the driven gears can rotate synchronously. The driven gears are fixedly installed on the extension sleeve on the spray frame.

[0012] Preferably, the top of the platform II has a mesh-like transparent structure, which can increase permeability and enhance the cooling effect, while allowing the coolant to flow out quickly and easily, achieving efficient circulation. The front end of the platform II is also provided with a slot, in which a baffle is vertically slidably installed. The lower edge of the baffle is also slidably connected to the slot on the vertical plate. The vertical plate is fixedly installed under the platform II. An electric cylinder is fixedly installed on one side of the vertical plate. The piston rod of the electric cylinder is fixedly connected to the extension plate of the baffle. The extension plate on the baffle is slidably installed in the groove of the vertical plate.

[0013] Preferably, the two heating induction coils I are in close contact with each other, and the two heating induction coils II are in close contact with each other, while the diameter of the heating induction coil I is larger than the diameter of the heating induction coil II.

[0014] The beneficial effects of this invention compared with the prior art are as follows: 1. When in use, this invention uses electromagnetic induction coil heating to heat stainless steel pipe fittings, and employs two sets of heating induction coils, two sets of small-diameter coils and two sets of large-diameter coils. This not only allows for simultaneous heating of pipe fittings of different diameters, but also enables their combined use. Each set of heating coils can be independently controlled, participating in or not participating in the heating process. For pipe fittings with thicker walls, two sets of heating coils of the same diameter can be used for simultaneous heating, which can quickly raise the internal temperature of the pipe fitting. For pipe fittings with thinner walls, only one heating coil of the corresponding diameter is needed for rapid heating. The heating method is flexible and adaptable.

[0015] 2. The present invention employs a spray cooling method. The spray nozzles are pre-set with multiple water outlet modes, allowing for flow rate adjustment based on pipe size and cooling requirements. The spray system has multiple groups, with the water volume of each subsequent group decreasing accordingly to gradually reduce cooling intensity and prevent pipe deformation or cracking due to excessive cooling speed. Furthermore, all spray frames can be adjusted synchronously, allowing for flow rate downgrading or upgrading for pipes of different sizes. This multi-stage spray cooling system enables more precise control of cooling speed and uniformity, improving cooling efficiency while reducing the amount of cooling medium used and lowering production costs. Attached Figure Description

[0016] Figure 1 This is an isometric view of the overall structure of the present invention.

[0017] Figure 2 This is a diagram showing the installation position of the heating induction coil of the present invention.

[0018] Figure 3 This is a comparison diagram of the diameters of the heating induction coils of the present invention.

[0019] Figure 4 This is a structural diagram of the flat gear in this invention.

[0020] Figure 5 This is a diagram showing the installation relationship at the long gear of the present invention.

[0021] Figure 6 This is a diagram showing the installation position of 14 in this invention.

[0022] Figure 7 This is a diagram showing the installation relationship of the lifting frame of the present invention.

[0023] Figure 8 This is a structural diagram of the spray frame of the present invention.

[0024] Figure 9 This is a first-view view of the installation of the baffle of the present invention.

[0025] Figure 10 This is a second perspective view of the installation of the baffle in this invention.

[0026] Figure 11 This is a diagram showing the connection relationship between the rack frame and the driven gear of the present invention.

[0027] Figure 12 This is a diagram of the internal structure of the 20 of the present invention.

[0028] Reference numerals: 1. Tabletop I; 2. Heating induction coil I; 3. Connector I; 4. Heating induction coil II; 5. Connector II; 6. Stop bar; 7. Flat gear; 8. Toggle lever; 9. Limiting lever; 10. Lead screw; 11. Stepper motor I; 12. Long gear; 13. Stepper motor II; 14. Roller; 15. Lifting frame; 16. Base plate; 17. Slide bar; 18. Hydraulic cylinder; 19. Tabletop II; 20. Sprayer rack; 21. Water inlet pipe; 22. Transition pipe; 23. Integrated head; 24. Side plate; 25. Rack frame; 26. Driven gear; 27. Stepper motor III; 28. Baffle; 29. ​​Vertical plate; 30. Electric cylinder. Detailed Implementation

[0029] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] In the description of this invention, it should be noted that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are merely simplified descriptions for ease of description and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, for ease of description, spatial relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatial relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the accompanying drawings. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatial relative descriptive terms used herein can be interpreted accordingly.

[0031] Implementation, for example Figures 1-12As shown, a heat treatment apparatus for stainless steel pipe fittings relates to the field of heat treatment of martensitic stainless steel.

[0032] In one optional embodiment of the present invention, such as Figure 2 , Figure 3 As shown, a groove is provided in the middle of the platform I1, and long shafts are provided on the extension plates on both sides of the groove. Each long shaft is rotatably mounted with a connector I3 and a connector II5. A heating induction coil I2 is fixedly integrated on the connector I3, and a heating induction coil II4 is fixedly integrated on the connector II5. That is, there are two heating induction coils I2 and two heating induction coils II4 in the groove in the middle of the platform I1, and the heating induction coils I2 and II4 are coaxial. A stop bar 6 is also fixedly installed on the extension plate of the platform I1. The stop bar 6 contacts the convex shaft in the middle of the connector I3 and the connector II5 to limit the movement of the connector I3 and the connector II5.

[0033] In one optional embodiment of the present invention, such as Figure 4 As shown, a flat gear 7 is movably mounted on the long shaft of the extension plate on the platform I1. Two levers 8 are symmetrically mounted on both sides of the flat gear 7. The levers 8 are locked in the gap at the upper edge of the connector I3 and the connector II5. Two symmetrical arc-shaped grooves are also provided on both sides of the flat gear 7. Limiting clips 9 are slidably installed in the arc-shaped grooves. Two round holes are provided on the outer end of the limiting clips 9. The round holes are slidably connected to the slide rails on both sides of the platform I1. A lead screw 10 is rotatably mounted on the extension plates on both sides of the platform I1. The lead screw 10 is threadedly connected to the limiting clip 9. At the same time, one end of the lead screw 10 is also connected to the motor shaft of the stepper motor I11. The stepper motor I11 is fixedly mounted on the extension plates on both sides of the platform I1.

[0034] In one optional embodiment of the present invention, such as Figure 5 As shown, long gears 12 are rotatably mounted on the extension plates on both sides of the platform I1. The long gears 12 mesh with the flat gears 7. At the same time, one end of the long gears 12 is connected to the motor shaft of the stepper motor II13. The stepper motor II13 is fixedly mounted on the extension plates.

[0035] Specifically, when selecting a mode, stepper motor I11 starts, driving lead screw 10 to rotate. Lead screw 10 drives limit card 9 to slide, and limit card 9 can drive flat gear 7 to slide left and right. This allows lever 8 on flat gear 7 to selectively insert into the gap on left connector I3 or right connector II5, or flat gear 7 to move to the middle, allowing lever 8 to insert into both gaps simultaneously. Then, stepper motor II13 starts, driving long gear 12 to rotate. Long gear 12 drives flat gear 7 to rotate, and lever 8 on flat gear 7 will drive connector I3 or connector II5, or both, to rotate. This allows heating induction coil I2 or heating induction coil II4 to be selectively removed from the heating working area according to the four situations mentioned above, causing heating induction coil I2 or heating induction coil II4 to lift up.

[0036] In one optional embodiment of the present invention, such as Figure 6 , Figure 7 As shown, two slide rods 17 are fixedly installed under the platform I1, and a base plate 16 is fixedly installed under the slide rods 17. A hydraulic cylinder 18 is fixedly installed at the middle position under the base plate 16. The piston rod of the hydraulic cylinder 18 is fixedly connected to the bottom of the lifting frame 15. The lifting frame 15 extends through the slot on the platform I1 to the top of the platform I1. At the same time, a roller 14 is rotatably installed on the top of the lifting frame 15. The roller 14 is driven by a built-in motor.

[0037] In one optional embodiment of the present invention, such as Figure 9 , Figure 12 As shown, side plates 24 are fixedly installed on both sides of the countertop II 19. Each side plate 24 has multiple round holes, and a water inlet pipe 21 is fixedly installed in each round hole. One end of the water inlet pipe 21 is sealed, and the other end is connected to the transition pipe 22. Multiple equally spaced round holes are provided below the water inlet pipe 21. A spray frame 20 is also rotatably installed outside the water inlet pipe 21. The inner wall of the spray frame 20 is circular, and the outer wall is square. Each surface of the outer wall has equally spaced nozzles. The distance between the nozzles is the same as the distance between the round holes below the water inlet pipe 21 and corresponds to each other. The shape of the nozzles on each surface of the outer wall of the water inlet pipe 21 is different, and the amount of water sprayed is also different.

[0038] In one optional embodiment of the present invention, such as Figure 9 , Figure 12As shown, the transition pipe 22 is centrally installed on the integrated head 23, which provides centralized water supply; the side plate 24 is provided with a right-angle bracket, on which a stepper motor III 27 is fixedly installed. The motor gear of the stepper motor III 27 meshes with the upward rack on the rack frame 25. The rack frame 25 is slidably installed on the slide rail on the side plate 24. At the same time, the downward rack on the rack frame 25 meshes with multiple driven gears 26, so that the driven gears 26 can rotate synchronously. The driven gears 26 are fixedly installed on the extension sleeve on the spray frame 20.

[0039] In one optional embodiment of the present invention, such as Figure 10 , Figure 11 As shown, the top of the platform II 19 has a mesh-like transparent structure, which can increase permeability and enhance the cooling effect, while allowing the coolant to flow out quickly and easily, achieving efficient circulation. The front end of the platform II 19 is also provided with a slot, in which a baffle 28 is vertically slidably installed. The lower edge of the baffle 28 is also slidably connected to the slot on the vertical plate 29. The vertical plate 29 is fixedly installed under the platform II 19. An electric cylinder 30 is fixedly installed on one side of the vertical plate 29. The piston rod of the electric cylinder 30 is fixedly connected to the extension plate of the baffle 28. The extension plate on the baffle 28 is slidably installed in the groove of the vertical plate 29.

[0040] In one optional embodiment of the present invention, such as Figure 3 As shown, two heating induction coils I2 are in close contact, and two heating induction coils II4 are in close contact. At the same time, the diameter of heating induction coil I2 is larger than the diameter of heating induction coil II4.

[0041] Working principle: This invention is for heat treatment of martensitic stainless steel. It first heats the stainless steel and then cools it down, thereby improving the strength of the pipe fittings.

[0042] First, determine the size of the tube to be heat-treated. If it is a large tube with a thin wall, select a single heating induction coil I2 for heating. If it is a large tube with a thick wall, select two heating induction coils I2 for simultaneous heating. If it is a small tube with a thin wall, select a single heating induction coil II4 for heating. If it is a small tube with a thick wall, select two heating induction coils II4 for simultaneous heating.

[0043] Specifically, when selecting a mode, stepper motor I11 starts, driving lead screw 10 to rotate. Lead screw 10 drives limit card 9 to slide, and limit card 9 can drive flat gear 7 to slide left and right. This allows lever 8 on flat gear 7 to selectively insert into the gap on left connector I3 or right connector II5, or flat gear 7 to move to the middle, allowing lever 8 to insert into both gaps simultaneously. Then, stepper motor II13 starts, driving long gear 12 to rotate. Long gear 12 drives flat gear 7 to rotate, and lever 8 on flat gear 7 will drive connector I3 or connector II5, or both, to rotate. This allows heating induction coil I2 or heating induction coil II4 to be selectively removed from the heating working area according to the four situations mentioned above, causing heating induction coil I2 or heating induction coil II4 to lift up.

[0044] Subsequently, the roller 14 can rotate to move the pipe fitting. At the same time, the height of the roller 14 can be adjusted by the lifting frame 15 through the hydraulic cylinder 18 to adapt to pipe fittings of different diameters, so that the center of the pipe fitting is always coaxial with the center of the heating induction coil I2 or the heating induction coil II4, ensuring uniform heating.

[0045] After the pipe is heated, it is sent to the table II 19. The baffle 28 on the table II 19 will hold the pipe until it is completely pushed out, thus keeping the pipe horizontal. Then the electric cylinder 30 drives the baffle 28 to descend, so that the pipe rolls on the table II 19 towards the outlet. The surface of the table II 19 has a very small slope of one degree, so that the pipe can roll slowly.

[0046] During the rolling process, the integrated head 23 connects to the water injection port, allowing water to enter multiple water inlet pipes 21 through the transition pipe 22. The water is then sprayed out through the nozzles on the spray frame 20 for gradual cooling. The cooling system can be adjusted according to the size of the pipe fittings to regulate the cooling flow and achieve the best cooling effect. The stepper motor III 27 starts, driving the rack frame 25 to slide. The rack frame 25 then drives the driven gear 26 to rotate, which in turn drives the spray frame 20 to rotate. This causes the different nozzles on the spray frame 20 to rotate downwards and connect with the through holes on the water inlet pipes 21, thereby achieving different flow rate regulation and uniform cooling.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stainless steel pipe fitting heat treatment apparatus characterized by, The middle of the table I (1) is provided with a groove, and the extension plates on the two sides of the groove are provided with long shafts, each of which is rotatably provided with a connecting head I (3) and a connecting head II (5), the connecting head I (3) is fixedly integrated with a heating induction coil I (2), and the connecting head II (5) is fixedly integrated with a heating induction coil II (4), that is, the middle of the groove of the table I (1) is provided with two heating induction coils I (2) and two heating induction coils II (4), and the heating induction coil I (2) and the heating induction coil II (4) are coaxial; the extension plate of the table I (1) is further fixedly provided with a blocking rod (6), the blocking rod (6) is in contact with the convex shafts in the middle of the connecting head I (3) and the connecting head II (5), and the connecting head I (3) and the connecting head II (5) are limited; The extension plate on the two sides of the table I (1) is further rotatably provided with a long gear (12), the long gear (12) is engaged with a flat gear (7), and one end of the long gear (12) is connected with a motor shaft of a stepping motor II (13), and the stepping motor II (13) is fixedly installed on the extension plate; The table I (1) is further fixedly provided with two sliding rods (17) below, the sliding rods (17) are fixedly provided with a bottom plate (16) below, the bottom plate (16) is fixedly provided with a hydraulic cylinder (18) at the middle position below, the piston rod of the hydraulic cylinder (18) is fixedly connected with the bottom of a lifting frame (15), the lifting frame (15) penetrates through a slot in the table I (1) and extends to the top of the table I (1), and the upper edge of the lifting frame (15) is further rotatably provided with a roller (14), and the roller (14) is driven by a built-in motor; The two sides of the table II (19) are fixedly provided with side plates (24), each side plate (24) is provided with a plurality of circular holes, and the circular holes are fixedly provided with water inlet pipes (21), one end of the water inlet pipe (21) is sealed, the other end is connected with an overflow pipe (22) in a butt joint manner, a plurality of circular holes are arranged at equal intervals at the lower position of the water inlet pipe (21), and the outer side of the water inlet pipe (21) is further rotatably provided with a spraying frame (20), the inner wall of the spraying frame (20) is circular, the outer wall is square, each face of the outer wall is provided with a plurality of spray heads arranged at equal intervals, the distance between the spray heads is the same as the distance between the circular holes at the lower position of the water inlet pipe (21), and the spray heads on each face of the outer wall of the water inlet pipe (21) are different in shape and water output.

2. The apparatus for heat treating stainless steel pipe as claimed in claim 1, wherein The long axis of the extension plate on the table I (1) is movably provided with a flat gear (7), two push rods (8) are symmetrically arranged on the two sides of the flat gear (7), the push rods (8) are clamped in the gap at the upper edge of the connecting head I (3) and the connecting head II (5), two symmetric arc-shaped grooves are arranged on the two sides of the flat gear (7), a limiting clamp (9) is slidably arranged in the arc-shaped groove, two round holes are arranged on the outer side of the limiting clamp (9) and are slidably connected with the slide rails on the two sides of the table I (1), a lead screw (10) is rotatably arranged on the extension plate on the two sides of the table I (1), the lead screw (10) is threadedly connected with the limiting clamp (9), and one end of the lead screw (10) is connected with the motor shaft of a stepping motor I (11), the stepping motor I (11) is fixedly arranged on the extension plate on the two sides of the table I (1).

3. The apparatus for heat treating stainless steel pipe as claimed in claim 1, wherein The over-pipe (22) is centrally arranged on the integrated head (23), the integrated head (23) is used for centralized water supply; the side plate (24) is provided with a right-angle support, the right-angle support is fixedly provided with a stepping motor III (27), the motor gear of the stepping motor III (27) is engaged with the upward toothed bar of the toothed bar frame (25), the toothed bar frame (25) is slidably arranged on the slide rail on the side plate (24), and the downward toothed bar of the toothed bar frame (25) is engaged with a plurality of driven gears (26), so that the driven gears (26) can synchronously rotate, and the driven gears (26) are fixedly arranged on the extension sleeve of the spraying frame (20).

4. The apparatus for heat treating stainless steel pipe as claimed in claim 3, wherein The upper surface of the table II (19) is provided with a net-shaped and permeable structure, the front end of the table II (19) is provided with a slot, the slot is vertically slidably provided with a baffle (28), the lower edge of the baffle (28) is slidably connected with the slot of the vertical plate (29), the vertical plate (29) is fixedly arranged on the lower surface of the table II (19), one side of the vertical plate (29) is fixedly provided with an electric cylinder (30), the piston rod of the electric cylinder (30) is fixedly connected with the extension plate of the baffle (28), and the extension plate of the baffle (28) is slidably arranged in the sliding groove of the vertical plate (29).

5. The apparatus for heat treating stainless steel pipe as defined in claim 1, wherein The two heating induction coils I (2) are close to each other, the two heating induction coils II (4) are close to each other, and the diameter of the heating induction coil I (2) is larger than that of the heating induction coil II (4).

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