A heat treatment device for nuclear power plant fastener machining

Abstract

The present application relates to the technical field of fastener processing, and discloses a heat treatment device for nuclear power station fastener processing, which comprises a conveying plate fixed with a conveying line, a chuck for fixing fasteners is rotatably arranged on the conveying plate, a gantry is fixed outside the conveying line, a liftable cross bar is arranged below the gantry, a lifting block is elastically arranged below the cross bar, a positioning frame is fixed on the lifting block, and an induction coil is fixed on the positioning frame; a straight bar is rotatably arranged on the lower surface of the cross bar, a pressing plate is fixed at the bottom end of the straight bar, a toothed plate is elastically arranged inside the cross bar, and a gear meshing with the toothed plate is fixed at the top end of the straight bar. When the induction coil moves downward to heat treat the fastener, the top of the fastener is pressed by the pressing plate, and the fastener is driven to rotate by the self-rotation of the pressing plate, so that the fastener is heated more uniformly, and the heat treatment effect is better.

Description

Technical Field

[0001] This invention relates to the field of fastener processing technology, specifically to a heat treatment device for processing fasteners in nuclear power plants. Background Technology

[0002] In the manufacturing process of fasteners (such as bolts) for nuclear power plants, heat treatment is a crucial step to ensure they achieve the required mechanical properties, corrosion resistance, and structural stability. Traditional nuclear power plant fastener heat treatment equipment uses induction coils to heat treat the fasteners.

[0003] In induction heat treatment, fasteners are typically kept stationary after being clamped and fixed. This static heating method presents a significant problem: the fixed relative positions of the fastener parts with the induction coil can lead to uneven heating in the circumferential direction. This is particularly problematic for fasteners used in large structures in nuclear power plants, where localized areas may experience uneven heat treatment results due to excessive or insufficient heating, such as inconsistent hardness or metallographic structures. This not only reduces the overall heat treatment quality and performance stability of the fasteners but may also pose a threat to their safe operation under the harsh conditions of nuclear power plants, thereby reducing the reliability of the heat treatment effect. Summary of the Invention

[0004] This invention provides a heat treatment apparatus for processing fasteners in nuclear power plants. When the induction coil moves downward, the fastener can rotate, which solves the problem mentioned in the background art that the relative positions of the fastener parts and the induction coil are fixed, resulting in uneven heating in the circumferential direction.

[0005] The present invention provides the following technical solution: a heat treatment device for processing fasteners in nuclear power plants, comprising a conveyor plate fixed to a conveyor line, a chuck for fixing fasteners being rotatably mounted on the conveyor plate, a gantry frame being fixed to the outside of the conveyor line, a liftable crossbar being mounted below the gantry frame, a lifting block being elastically mounted below the crossbar, a positioning frame being fixed on the lifting block, and an induction coil being fixed on the positioning frame. The induction coil performs heat treatment on the fasteners by moving downwards.

[0006] A straight rod is rotatably mounted on the lower surface of the crossbar, and a pressure plate is fixed to the bottom end of the straight rod. A toothed plate is elastically mounted inside the crossbar, and a gear that meshes with the toothed plate is fixed to the top end of the straight rod. A steel wire rope is fixed on the lifting block, and the other end of the steel wire rope is fixed to the toothed plate. The lifting block pulls the steel wire rope by moving downward relative to the crossbar, causing the pressure plate to rotate.

[0007] As an optional embodiment of the heat treatment device for processing fasteners in nuclear power plants according to the present invention, a servo electric cylinder is fixed to the lower surface of the gantry frame, a connecting rod is fixed to the output end of the servo electric cylinder, a longitudinal rod is fixed to the lower surface of the connecting rod, a crossbar is slidably sleeved on the circumference of the longitudinal rod, and the lifting block is fixed to the bottom end of the longitudinal rod.

[0008] As an optional embodiment of the heat treatment apparatus for processing fasteners in nuclear power plants according to the present invention, a placement platform is fixed on the upper surface of the chuck, a jaw is slidably disposed on the chuck, and a clamping plate for fixing the fastener is slidably connected to the jaw.

[0009] As an optional embodiment of the heat treatment device for processing fasteners in nuclear power plants according to the present invention, a support rod is fixed to the surface of the lifting block, and a pressure ring for pressing down the clamping plate is fixed to the end of the support rod.

[0010] As an optional embodiment of the heat treatment device for processing fasteners in nuclear power plants according to the present invention, the inside of the chuck is provided with a sliding groove for the clamping plate to slide, the inside of the sliding groove is elastically provided with a sliding plate, the outer surface of the clamping plate is fixed with a sliding protrusion, and the inner wall of the sliding groove is provided with an inclined groove and a vertical groove for the sliding protrusion to slide.

[0011] As an optional embodiment of the heat treatment device for processing fasteners in nuclear power plants according to the present invention, an air supply pump is fixed on the outer surface of the lifting block, an air supply pipe communicating with the air supply pump is provided inside the support rod, and a plurality of first air blowing holes communicating with the air supply pipe are opened on the inner surface of the pressure ring.

[0012] As an optional embodiment of the heat treatment device for processing fasteners in nuclear power plants according to the present invention, the pressure ring includes an outer ring, a central ring and an inner ring that are slidably connected in sequence. The inner ring has a first gas guide groove that communicates with the gas supply pipe inside. The central ring has a second gas guide groove that communicates with the gas supply pipe inside. The outer ring has a third gas guide groove that communicates with the gas supply pipe inside.

[0013] As an optional embodiment of the heat treatment device for processing fasteners in nuclear power plants according to the present invention, a second air blowing hole communicating with the second air guide groove is provided on the central ring, and a third air blowing hole communicating with the third air guide groove is provided on the outer ring, and the first air blowing hole is communicating with the first air guide groove.

[0014] As an optional embodiment of the heat treatment device for processing fasteners in nuclear power plants according to the present invention, a first telescopic tube is fixed on the support rod, and a transmission rod is fixed at the end of the first telescopic tube, and the transmission rod is fixed to the surface of the inner ring.

[0015] As an optional embodiment of the heat treatment apparatus for processing fasteners in nuclear power plants according to the present invention, the outer surface of the inner ring is provided with an insertion hole, the surface of the chuck is fixed with an electric push rod, and the output end of the electric push rod is fixed with a plug rod for inserting into the insertion hole.

[0016] The present invention has the following beneficial effects:

[0017] 1. The heat treatment device for fastener processing in this nuclear power plant involves moving a lifting block downwards to bring the induction coil to the outside of the fastener for heat treatment during the heat treatment process. As the lifting block moves the induction coil downwards, a pressure plate presses the top of the fastener. Subsequently, the lifting block continues to move downwards, stretching the first spring. Through a structure such as a wire rope, guide wheel, toothed plate, and gears, the pressure plate and the fastener rotate, ensuring that the fastener is heated evenly during the heat treatment process. This effectively avoids uneven heating caused by the fastener being stationary, resulting in a better heat treatment effect.

[0018] 2. The heat treatment device for fastener processing in this nuclear power plant, through the setting of a pressure ring, drives the lifting block to move synchronously when it moves downward. The pressure ring is set below the induction coil, so that the pressure ring moves to the bottom end of the fastener before the induction coil and abuts against the top of the clamping plate. This causes the clamping plate to move outward along the inclined groove to avoid friction with the fastener, and then move downward along the vertical groove to the bottom end of the fastener, exposing the hexagonal end of the fastener. This facilitates heat treatment by the induction coil and avoids the clamping plate obstructing the fastener, which would affect the heat treatment and improve the heat treatment effect.

[0019] 3. In the heat treatment device for fastener processing in this nuclear power plant, the pressure ring moves downward along the surface of the fastener before the induction coil. Air is blown through the first air blowing hole, which can effectively remove impurities and foreign objects from the surface of the fastener, avoiding their adverse effects on the heat treatment effect. After the heat treatment is completed, the lifting block drives the pressure ring to move upward, and the gas blown out of the first air blowing hole cools the fastener, which can achieve uniform cooling on multiple surfaces and avoid the problem of excessively rapid local cooling caused by direct water cooling or oil cooling, preventing the fastener from deforming or cracking, thereby further improving the heat treatment effect.

[0020] 4. The heat treatment device for fastener processing in this nuclear power plant uses a telescopic structure for the pressure ring. After heat treatment, the pressure ring moves upward, and at this time, the pressure ring is restricted, causing the pressure ring to elongate as a whole. During the elongation process, the first air blowing hole, the second air blowing hole, and the third air blowing hole open simultaneously to air cool the fastener. When the pressure ring reaches its longest extension, the restriction is released, and the pressure ring retracts and resets. During the retraction and reset process, the pressure ring resets from bottom to top, allowing for continued air cooling of the fastener. This not only increases the air blowing range of the fastener but also increases the air cooling time, further improving the air cooling effect. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle.

[0023] Figure 3 For the present invention Figure 1 Enlarged view of section B in the middle.

[0024] Figure 4 This is a structural schematic diagram from another perspective of the present invention.

[0025] Figure 5 For the present invention Figure 4 Enlarged view of point C in the middle.

[0026] Figure 6 This is a schematic diagram of the structure of the induction coil part in this invention.

[0027] Figure 7 This is a cross-sectional view of the crossbar portion in this invention.

[0028] Figure 8 This is a cross-sectional view of the chuck portion in this invention.

[0029] Figure 9 For the present invention Figure 8 Enlarged view of point D in the middle.

[0030] Figure 10 This is a schematic diagram of the pressure ring portion in this invention.

[0031] Figure 11 This is a cross-sectional view of the pressure ring portion in this invention.

[0032] Figure 12 This is a cross-sectional view of the first telescopic tube portion in this invention.

[0033] In the diagram: 1. Conveyor line; 2. Conveyor plate; 3. Chuck; 4. Gantry frame; 5. Crossbar; 6. Lifting block; 7. Positioning frame; 8. Induction coil; 9. Straight rod; 10. Pressure plate; 11. Toothed plate; 12. Gear; 13. Wire rope; 14. Servo cylinder; 15. Connecting rod; 16. Longitudinal rod; 17. Placement platform; 18. Claw; 19. Clamping plate; 20. Support rod; 21. Pressure ring; 211. Outer ring; 212. Center ring; 213. Inner ring; 22. Slide groove; 23. Slide plate; 24. Sliding protrusion; 25. Inclined groove; 26. Vertical groove; 27. Air supply pump; 28. Air conveyor. 29. First air inlet; 30. First air guide groove; 31. Second air guide groove; 32. Third air guide groove; 33. Second air inlet; 34. Third air inlet; 35. First telescopic tube; 351. Outer tube; 352. Inner tube; 353. Storage groove; 354. Fourth spring; 355. Damping plate; 36. Transmission rod; 37. Insertion hole; 38. Electric push rod; 39. Insert rod; 40. First spring; 41. Guide wheel; 42. Heat insulation cover; 43. Second telescopic tube; 44. Third telescopic tube; 45. Connecting tube; 46. Second spring; 47. Fastener; 48. Third spring. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1, please refer to Figures 1-12 A heat treatment device for processing fasteners in nuclear power plants includes a conveyor plate 2 fixed to a conveyor line 1, a chuck 3 rotatably mounted on the conveyor plate 2 for fixing fasteners 47, a gantry frame 4 fixed to the outside of the conveyor line 1, a liftable crossbar 5 mounted below the gantry frame 4, a lifting block 6 elastically mounted below the crossbar 5, a positioning frame 7 fixed on the lifting block 6, and an induction coil 8 fixed on the positioning frame 7. The induction coil 8 heat-treats the fasteners 47 by moving downwards.

[0036] A straight rod 9 is rotatably mounted on the lower surface of the crossbar 5. A pressure plate 10 is fixed at the bottom end of the straight rod 9. A toothed plate 11 is elastically mounted inside the crossbar 5. A gear 12 that meshes with the toothed plate 11 is fixed at the top end of the straight rod 9. A steel wire rope 13 is fixed on the lifting block 6. The other end of the steel wire rope 13 is fixed to the toothed plate 11. The lifting block 6 pulls the steel wire rope 13 by moving downward relative to the crossbar 5, causing the pressure plate 10 to rotate.

[0037] A servo electric cylinder 14 is fixed to the lower surface of the gantry frame 4. A connecting rod 15 is fixed to the output end of the servo electric cylinder 14. A longitudinal rod 16 is fixed to the lower surface of the connecting rod 15. A crossbar 5 is slidably sleeved on the circumference of the longitudinal rod 16. A lifting block 6 is fixed to the bottom end of the longitudinal rod 16.

[0038] A placement platform 17 is fixed on the upper surface of the chuck 3, and a jaw 18 is slidably disposed on the chuck 3. A clamping plate 19 for fixing the fastener 47 is slidably connected to the jaw 18.

[0039] In this technical solution, the chuck 3 is a three-jaw chuck, which can drive the jaws 18 to move, thereby achieving clamping and fixing. The chuck 3 is existing technology and not an innovation of this application, so it will not be described in detail. During the heat treatment of the fastener 47, the fastener 47 is first placed on the placement table 17. The chuck 3 drives the jaws 18 to move, and the jaws 18 drive the clamping plate 19 to move, so that the clamping plate 19 fixes the fastener 47. After fixing, the fastener 47 is conveyed along the conveyor line 1, such as... Figure 1 As shown, when the fastener 47 moves directly below the induction coil 8, the conveyor line 1 stops. Then, the servo cylinder 14 pushes the connecting rod 15 downward, the connecting rod 15 drives the vertical rod 16 downward, the vertical rod 16 drives the lifting block 6 downward, the lifting block 6 drives the positioning frame 7 downward, and the positioning frame 7 drives the induction coil 8 downward, so that the induction coil 8 moves to the outside of the fastener 47 and performs heat treatment on the fastener 47. After the heat treatment is completed, the servo cylinder 14 resets, drives the induction coil 8 to reset, and the conveyor line 1 moves to continue conveying the fastener 47 to the unloading position for subsequent processing.

[0040] In induction heat treatment, if the fastener 47 remains stationary, the heating of the fastener 47 may not be uniform, easily leading to differences in the heat treatment effect and thus reducing the heat treatment effect. To address this issue, when the lifting block 6 moves downward, it drives the crossbar 5 downward. The crossbar 5, through the straight rod 9, drives the pressure plate 10 downward until the pressure plate 10 presses the top of the fastener 47. A first spring 40 is fixed between the crossbar 5 and the lifting block 6. The first spring 40 is sleeved on the circumference of the vertical rod 16. Then, the lifting block 6 continues to move downward, stretching the first spring 40, causing the first spring 40 to store force. The lifting block 6 moves downward relative to the crossbar 5, and the downward movement of the lifting block 6 pulls the wire rope 13 downward. Figure 7As shown, the crossbar 5 is internally equipped with a guide wheel 41 for guiding the wire rope 13. The wire rope 13 moves downward, pulling the toothed plate 11 to the left. The toothed plate 11 moves to the left, driving the gear 12 to rotate. The gear 12 rotates, driving the straight rod 9 to rotate. The straight rod 9 rotates, driving the pressure plate 10 to rotate. Since the pressure plate 10 is pressed against the top of the fastener 47, and the chuck 3 is rotatably connected to the conveyor plate 2, the pressure plate 10 can drive the fastener 47 and the chuck 3 to rotate synchronously. Thus, while the lifting block 6 drives the induction coil 8 to move downward to heat-treat the fastener 47, the fastener 47 can rotate, resulting in more uniform heating of the fastener 47 and better heat treatment effect.

[0041] In this technical solution, a second spring 46 is fixed between the inner wall of the crossbar 5 and the toothed plate 11. When the toothed plate 11 moves to the left, the second spring 46 is stretched and stored, which facilitates the subsequent reset of the toothed plate 11. A heat insulation cover 42 is provided on the outside of the induction coil 8. The heat insulation cover 42 is fixed on the positioning frame 7. The heat insulation cover 42 can provide heat insulation and increase safety.

[0042] In Example 2, to facilitate the fixing of fastener 47 and increase its stability, the hexagonal end of fastener 47 is typically fixed. However, when clamping plate 19 fixes the hexagonal end of fastener 47, clamping plate 19 is located outside the hexagonal end, causing it to obstruct the hexagonal end and thus affecting subsequent heat treatment. To address this issue, this example is an improvement based on Example 1. For details, please refer to [link / reference]. Figures 1-12 A support rod 20 is fixed to the surface of the lifting block 6, and a pressure ring 21 for pressing down the clamping plate 19 is fixed to the end of the support rod 20.

[0043] The claw 18 has a groove 22 inside for the clamping plate 19 to slide. A sliding plate 23 is elastically installed inside the groove 22. A sliding protrusion 24 is fixed on the outer surface of the clamping plate 19. An inclined groove 25 and a vertical groove 26 are provided on the inner wall of the groove 22 for the sliding protrusion 24 to slide.

[0044] In this technical solution, as the lifting block 6 moves downward, it simultaneously drives the support rod 20 and the pressure ring 21 to move downward. The pressure ring 21 is positioned below the induction coil 8, causing it to move to the bottom of the fastener 47 before the induction coil 8. When the pressure ring 21 moves downward to the bottom of the fastener 47, it abuts against the top of the clamping plate 19, causing the clamping plate 19 to move downward. Figure 8As shown, the clamping plate 19 moves downward, causing the sliding protrusion 24 to slide along the inclined groove 25 first, so that the clamping plate 19 moves to the outside of the fastener 47, avoiding friction between the clamping plate 19 and the fastener 47. Then, the pressure ring 21 continues to drive the clamping plate 19 to move downward, and the sliding protrusion 24 slides downward along the vertical groove 26, moving the clamping plate 19 from the bottom end of the fastener 47 until the pressure ring 21 also moves to the bottom of the fastener 47. At this time, the hexagonal end of the fastener 47 will be exposed, which facilitates the heat treatment of the induction coil 8 and helps to improve the heat treatment effect.

[0045] In this technical solution, a third spring 48 is fixed between the bottom of the slide plate 23 and the slide groove 22. When the clamping plate 19 moves downward, it drives the slide plate 23 to move downward along the slide groove 22. The slide plate 23 compresses the third spring 48, so that the third spring 48 stores force, which facilitates the subsequent reset of the clamping plate 19 driven by the slide plate 23. In addition, when the pressure ring 21 drives the clamping plate 19 to move downward, the clamping plate 19 separates from the fastener 47. Since the pressure plate 10 and the placement platform 17 cooperate to continue to press the fastener 47, it will not affect the fixation of the fastener 47.

[0046] In Example 3, before the fastener 47 undergoes heat treatment, some impurities and foreign matter may exist on its surface. If not cleaned in time, these impurities will volatilize or burn at high temperatures, affecting the heat treatment quality, leading to uneven product performance and cracks. To address this issue, this example is an improvement based on Example 2. For details, please refer to... Figures 1-12 An air pump 27 is fixed on the outer surface of the lifting block 6. An air supply pipe 28 connected to the air pump 27 is provided inside the support rod 20. Several sets of first air blowing holes 29 connected to the air supply pipe 28 are opened on the inner surface of the pressure ring 21.

[0047] In this technical solution, since the pressure ring 21 is located below the induction coil 8, the pressure ring 21 will move downward along the surface of the fastener 47 before the induction coil 8. Therefore, the air supply pump 27 supplies air to the air supply pipe 28, the air supply pipe 28 delivers the air to the pressure ring 21, and then blows it out through the first air blowing hole 29. This allows the pressure ring 21 to clean the surface of the fastener 47 by blowing air while moving downward along the fastener 47, making it easier to remove impurities and foreign objects from the surface of the fastener 47, thereby avoiding impurities and foreign objects from affecting the heat treatment effect.

[0048] After the heat treatment of fastener 47 is completed, if water cooling or oil cooling is used directly for cooling, it may cause localized excessively rapid cooling of fastener 47, resulting in deformation or cracking, which will affect the dimensional accuracy and mechanical properties of fastener 47. Therefore, after the heat treatment is completed, the lifting block 6 moves upward to move the induction coil 8 out from the outside of fastener 47. At the same time, the lifting block 6 drives the pressure ring 21 to move upward. At this time, the first air blowing hole 29 blows out gas, which can also cool the heat-treated fastener 47 by air cooling. Air cooling can achieve uniform cooling on multiple sides, avoiding deformation or cracking caused by excessively rapid localized cooling, thereby further improving the heat treatment effect.

[0049] In Example 4, when the lifting block 6 moves the pressure ring 21 upward, the pressure ring 21 moves the first air-blowing hole 29 upward continuously. This causes the first air-blowing hole 29 to quickly pass through the fastener 47, resulting in a short air-blowing time for each part of the fastener 47. Consequently, the part of the fastener 47 being blown on may not be sufficiently cooled before the first air-blowing hole 29 moves upward to cool another part, thus reducing the cooling effect. To address this issue, this example is an improvement based on Example 3. For details, please refer to Example 3. Figures 1-12 The pressure ring 21 includes an outer ring 211, a central ring 212 and an inner ring 213 that are slidably connected in sequence. The inner ring 213 has a first air guide groove 30 that communicates with the air supply pipe 28. The central ring 212 has a second air guide groove 31 that communicates with the air supply pipe 28. The outer ring 211 has a third air guide groove 32 that communicates with the air supply pipe 28.

[0050] The central ring 212 is provided with a second air hole 33 that communicates with the second air guide groove 31, and the outer ring 211 is provided with a third air hole 34 that communicates with the third air guide groove 32. The first air hole 29 communicates with the first air guide groove 30.

[0051] A first telescopic tube 35 is fixed on the support rod 20, and a transmission rod 36 is fixed to the end of the first telescopic tube 35. The transmission rod 36 is fixed to the surface of the inner ring 213.

[0052] The outer surface of the inner ring 213 is provided with a socket 37, and an electric push rod 38 is fixed on the surface of the chuck 3. The output end of the electric push rod 38 is fixed with a plug rod 39 for inserting into the socket 37.

[0053] In this technical solution, when the pressure ring 21 moves downward to its lowest position, the electric push rod 38 pushes the insertion rod 39 to move, inserting the insertion rod 39 into the insertion hole 37 to restrict the inner ring 213. When the lifting block 6 moves upward, the lifting block 6 drives the outer ring 211 to move upward through the support rod 20. At this time, because the inner ring 213 is restricted, it cannot move upward. Therefore, an upward pulling force is generated at the outer ring 211, causing the outer ring 211, the central ring 212, and the inner ring 213 to slide relative to each other, causing the pressure ring 21 to elongate. During the extension process, the transmission rod 36 also drives the first telescopic tube 35 to extend. The first telescopic tube 35 includes an outer tube 351 and an inner tube 352 that are slidably connected to each other. The outer tube 351 has a receiving groove 353 inside, and the inner tube 352 is slidably disposed in the receiving groove 353. A fourth spring 354 is fixed between the inner tube 352 and the inner wall of the receiving groove 353. When the first telescopic tube 35 extends, the inner tube 352 compresses the fourth spring 354, causing the fourth spring 354 to store force, which facilitates the subsequent reset of the first telescopic tube 35. Figure 10 and Figure 11 As shown, during the elongation of the pressure ring 21, the inner ring 213 slides relative to the central ring 212 to open the second air hole 33, and the central ring 212 slides relative to the outer ring 211 to open the third air hole 34. This allows the first air hole 29, the second air hole 33, and the third air hole 34 to simultaneously provide air cooling for the fastener 47. When the pressure ring 21 extends to its maximum length, the outer ring 211, the central ring 212, and the inner ring 213 completely cover the fastener 47. Then, the electric push rod 38 resets, inserting the rod 3... 9 is removed from the socket 37. At this time, the restriction of the inner ring 213 is released, the fourth spring 354 releases the force, and the first telescopic tube 35 retracts and resets. The first telescopic tube 35 drives the inner ring 213 to move upward through the transmission rod 36, thereby causing the inner ring 213, the central ring 212 and the outer ring 211 to retract and reset. During the process of the inner ring 213, the central ring 212 and the outer ring 211 retracting and resetting, the fastener 47 can also be air-cooled from bottom to top, thereby increasing the air-cooling time and making the air-cooling effect better.

[0054] In order to increase the time for the inner ring 213, the central ring 212 and the outer ring 211 to retract and reset, and further increase the air cooling time, a damping plate 355 is set between the inner tube 352 and the outer tube 351 to increase the friction force when the inner tube 352 slides, thereby reducing the speed of the inner tube 352 during reset, thereby increasing the time for the pressure ring 21 to reset upward, which is beneficial to further improve the air cooling effect.

[0055] In this technical solution, such as Figure 11As shown, a second telescopic tube 43 is provided connecting the inner ring 213 and the gas supply pipe 28, a third telescopic tube 44 is provided connecting the central ring 212 and the gas supply pipe 28, and a connecting tube 45 is provided connecting the outer pipe 351 and the gas supply pipe 28. Both the second telescopic tube 43 and the third telescopic tube 44 are hollow structures, and each includes two tube bodies that can slide relative to each other, thus achieving the telescopic function. The two tube bodies are sealed together. Through the provided second telescopic tube 43 and third telescopic tube 44, the sliding of the inner ring 213 and the central ring 212 is achieved without affecting the sliding of the inner ring 213 and the central ring 212. The sliding distance between the inner ring 213 and the central ring 212 can be limited. In addition, when the inner ring 213 slides downward relative to the central ring 212, the second air hole 33 will be opened, and when the central ring 212 slides downward relative to the outer ring 211, the third air hole 34 will be opened. This allows the inner ring 213 and the central ring 212 to blow air onto the fastener 47 without considering the order of extension and retraction. As the length continues to increase, the second air hole 33 and the third air hole 34 open for a longer period of time, thereby increasing the air blowing range on the fastener 47 and further improving the air cooling time.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0057] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A heat treatment apparatus for processing fasteners in nuclear power plants, comprising a conveyor plate (2) fixed to a conveyor line (1), characterized in that: The conveyor plate (2) is rotatably provided with a chuck (3) for fixing the fastener (47). A gantry frame (4) is fixed on the outside of the conveyor line (1). A liftable crossbar (5) is provided below the gantry frame (4). A lifting block (6) is elastically provided below the crossbar (5). A positioning frame (7) is fixed on the lifting block (6). An induction coil (8) is fixed on the positioning frame (7). The induction coil (8) performs heat treatment on the fastener (47) by moving downward. A straight rod (9) is rotatably mounted on the lower surface of the crossbar (5). A pressure plate (10) is fixed at the bottom end of the straight rod (9). A toothed plate (11) is elastically mounted inside the crossbar (5). A gear (12) that meshes with the toothed plate (11) is fixed at the top end of the straight rod (9). A steel wire rope (13) is fixed on the lifting block (6). The other end of the steel wire rope (13) is fixed to the toothed plate (11). The lifting block (6) pulls the steel wire rope (13) downward relative to the crossbar (5), causing the pressure plate (10) to rotate.

2. The heat treatment apparatus for processing fasteners in nuclear power plants according to claim 1, characterized in that: A servo electric cylinder (14) is fixed on the lower surface of the gantry frame (4). A connecting rod (15) is fixed at the output end of the servo electric cylinder (14). A longitudinal rod (16) is fixed on the lower surface of the connecting rod (15). The crossbar (5) is slidably sleeved on the circumference of the longitudinal rod (16). The lifting block (6) is fixed to the bottom end of the longitudinal rod (16).

3. The heat treatment apparatus for processing fasteners in nuclear power plants according to claim 2, characterized in that: The upper surface of the chuck (3) is fixed with a placement platform (17), and a chuck claw (18) is slidably disposed on the chuck (3). A clamping plate (19) for fixing the fastener (47) is slidably connected to the chuck claw (18).

4. The heat treatment apparatus for processing fasteners in nuclear power plants according to claim 3, characterized in that: The surface of the lifting block (6) is fixed with a support rod (20), and the end of the support rod (20) is fixed with a pressure ring (21) for pressing down the clamping plate (19).

5. The heat treatment apparatus for processing fasteners in nuclear power plants according to claim 4, characterized in that: The claw (18) has a sliding groove (22) inside for the clamping plate (19) to slide. A sliding plate (23) is elastically provided inside the sliding groove (22). A sliding protrusion (24) is fixed on the outer surface of the clamping plate (19). An inclined groove (25) and a vertical groove (26) are provided on the inner wall of the sliding groove (22) for the sliding protrusion (24) to slide.

6. The heat treatment apparatus for processing fasteners in nuclear power plants according to claim 5, characterized in that: An air pump (27) is fixed on the outer surface of the lifting block (6), and an air supply pipe (28) communicating with the air pump (27) is provided inside the support rod (20). Several sets of first air blowing holes (29) communicating with the air supply pipe (28) are opened on the inner surface of the pressure ring (21).

7. The heat treatment apparatus for processing fasteners in nuclear power plants according to claim 6, characterized in that: The pressure ring (21) includes an outer ring (211), a central ring (212), and an inner ring (213) that are slidably connected in sequence. The inner ring (213) has a first air guide groove (30) that communicates with the gas supply pipe (28) inside. The central ring (212) has a second air guide groove (31) that communicates with the gas supply pipe (28) inside. The outer ring (211) has a third air guide groove (32) that communicates with the gas supply pipe (28) inside.

8. The heat treatment apparatus for processing fasteners in nuclear power plants according to claim 7, characterized in that: The central ring (212) has a second air hole (33) that communicates with the second air guide groove (31), and the outer ring (211) has a third air hole (34) that communicates with the third air guide groove (32). The first air hole (29) communicates with the first air guide groove (30).

9. The heat treatment apparatus for processing fasteners in nuclear power plants according to claim 8, characterized in that: A first telescopic tube (35) is fixed on the support rod (20), and a transmission rod (36) is fixed at the end of the first telescopic tube (35). The transmission rod (36) is fixed to the surface of the inner ring (213).

10. The heat treatment apparatus for processing fasteners in nuclear power plants according to claim 9, characterized in that: The outer surface of the inner ring (213) is provided with a socket (37), and an electric push rod (38) is fixed on the surface of the chuck (3). The output end of the electric push rod (38) is fixed with a plug rod (39) for inserting into the socket (37).

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