A device for improving the cooling uniformity of heavy parts after heat treatment

Abstract

This invention relates to the field of heat treatment cooling devices, and discloses a device for improving the cooling uniformity of heavy parts after heat treatment. The device includes a support frame, a supporting heat dissipation section, a surrounding cooling section, and a centering and straightening section. The support frame provides a vertical cooling space; the supporting heat dissipation section supports the parts and accelerates heat dissipation from the bottom; the surrounding cooling section includes multiple layers of circumferentially distributed cooling nozzles and a drive mechanism, which drives all nozzles to swing synchronously, causing the cooling medium to be sprayed circumferentially along the parts; the centering and straightening section includes a power source, a transmission mechanism, and multiple circumferentially distributed straightening arms, which are driven by the transmission mechanism to move synchronously back and forth radially along the parts, automatically pushing the high-temperature parts to the center of the frame and straightening them. This device achieves automatic centering and circumferential cooling of the parts, effectively reducing cooling temperature differences and thermal stress, thereby reducing bending deformation of the parts and significantly improving the cooling uniformity of large shaft parts after heat treatment.

Description

Technical Field

[0001] This invention relates to the field of heat treatment cooling apparatus, and more particularly to an apparatus for improving the cooling uniformity of heavy parts after heat treatment. Background Technology

[0002] Heavy alloy steel shaft parts (such as 42CrMo steel bars with a diameter of 600mm, a length of 9000mm, and a weight of approximately 20 tons) need to be cooled to room temperature after heat treatment such as tempering, annealing, or nitriding before further processing. The core challenge of existing cooling methods is that during the cooling process from a high temperature to room temperature, due to the large cross-sectional dimensions, there are significant temperature differences along both the axial and radial directions. This uneven cooling, leading to thermal stress concentration, is the root cause of bending deformation and even cracking of the parts.

[0003] To control deformation, the industry has attempted to place parts vertically in deep wells for cooling, hoping to reduce bending by utilizing gravitational symmetry. However, vertical cooling faces two major technical obstacles: firstly, the poor air circulation inside deep wells results in a much lower natural convection heat transfer efficiency than in open environments, leading to slow cooling and extended process cycles; secondly, even with forced air cooling, existing methods often involve blowing air from one side or a fixed direction, preventing the airflow from being evenly distributed around the part's circumference and potentially exacerbating local temperature differences. More importantly, effective forced cooling requires the part to be precisely centered within the deep well; otherwise, uneven circumferential gaps will result in uneven airflow distribution. However, heavy parts operating at high temperatures (surface temperatures exceeding 500°C) cannot be manually aligned. Existing support devices, such as patent CN217052298U, can achieve radial fixation through manual adjustment of the sizing rod, but this only addresses the anti-tipping issue and lacks automatic alignment functionality. Furthermore, manual adjustment is unsuitable for high-temperature conditions and poses a risk of burns to personnel. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies that fail to achieve uniform cooling of high-temperature heavy parts, leading to thermal stress concentration, bending deformation, and even cracking. It provides a device for improving the cooling uniformity of heavy parts after heat treatment, which can effectively enhance the cooling uniformity of heavy parts.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: An apparatus for improving the cooling uniformity of heavy parts after heat treatment, comprising: The support frame, buried in a deep well, is used to provide vertical cooling space; A heat dissipation support is provided at the bottom of the support frame to support vertically placed parts and accelerate heat dissipation from the bottom of the parts. The surround cooling section is mounted on the support frame and is used to spray cooling medium onto the surface of the part. The surround cooling section includes cooling nozzles and a drive mechanism. Multiple cooling nozzles are arranged at intervals along the vertical direction of the support frame, and multiple nozzles are arranged around the circumference of the support frame in each layer. The drive mechanism is used to drive all the cooling nozzles to swing synchronously. The centering and straightening unit is installed on the support frame and is used to push and straighten parts that are off-center from the support frame to their center position. The centering and straightening unit includes a power source, a transmission mechanism, and multiple straightening arms distributed circumferentially along the support frame. The straightening arms are connected to the transmission mechanism and can achieve synchronous radial reciprocating movement under the drive of the power source through the transmission mechanism.

[0006] The above-described solution employs a support frame embedded in a deep well, providing a vertical cooling space for heavy components. This helps to mitigate the issues of heavy shaft components being prone to tipping over and requiring prolonged use of lifting equipment during vertical cooling. The support heat dissipation section stably supports the components and accelerates heat dissipation from the bottom, reducing uneven cooling in the contact area between the components and the support surface. The surrounding cooling section sprays cooling medium through circumferentially arranged cooling nozzles, which, driven by a mechanism, vertically swing, allowing the cooling medium to flow more evenly along the circumference and axial direction of the components. The centering and straightening section pushes off-center high-temperature components to the center of the frame and maintains their upright position, making the gaps around the components more uniform and alleviating the uneven circumferential airflow and large local temperature differences caused by component eccentricity. Combined with the surrounding cooling section, this improves overall cooling uniformity. This device eliminates the need for close-range manual operation of high-temperature components, reducing the risk of burns, helping to reduce thermal stress concentration in heavy components, lowering the probability of bending deformation and cracking, shortening the cooling cycle, and improving the cooling quality after heat treatment.

[0007] Preferably, the cooling nozzle includes a nozzle head, a nozzle ball head, and a rear cover. The rear cover is fixed to the support frame and has a spherical concave surface inside. One end of the nozzle ball head is ball-jointed with the spherical concave surface, and the other end is fixedly connected to the nozzle head.

[0008] The above solution uses a ball joint connecting the nozzle head and the rear cover, which allows the nozzle head to flexibly adjust the spray angle, ensuring a stable and adjustable cooling airflow direction. Combined with the centered positioning of the parts, this helps to improve the consistency of circumferential cooling of the parts.

[0009] Preferably, the surround cooling section also includes multiple angle adjustment plates, with each row of cooling nozzles arranged vertically corresponding to one angle adjustment plate; the drive mechanism is used to drive all angle adjustment plates to rise and fall synchronously, and the angle adjustment plates drive the corresponding cooling nozzles to swing synchronously.

[0010] By adopting the above scheme, by configuring an angle adjustment plate for each row of vertically arranged cooling nozzles and using a drive mechanism to drive all angle adjustment plates to rise and fall synchronously, it is possible to keep the swing angle and movement rhythm of each row of cooling nozzles uniform, ensuring that the spray direction and blowing range of the cooling medium are coordinated and consistent, which is conducive to improving the stability and consistency of the distribution of cooling airflow on the surface of the parts, thereby improving the overall cooling uniformity of the parts.

[0011] Preferably, the angle adjustment plate is provided with multiple movable slots at intervals along the vertical direction, and the air nozzle is inserted into the corresponding movable slot and swings up and down along the vertical plane under the action of the angle adjustment plate.

[0012] By adopting the above solution, by setting movable slots at intervals along the vertical direction on the angle adjustment plate, the air nozzle is confined within the movable slots. This allows the air nozzle to swing stably up and down along the vertical plane under the drive of the angle adjustment plate, ensuring that the direction of the cooling medium injection is controllable.

[0013] Preferably, the heat dissipation support includes a base plate fixed to the support frame, with multiple through heat dissipation holes on the base plate. A cooling air pipe is provided below the base plate, with the air outlet of the cooling air pipe extending outside the support frame. The cooling air pipe and the heat dissipation holes are staggered.

[0014] The above solution involves opening through-holes in the base plate and staggering the cooling pipes below. This not only accelerates heat dissipation from the bottom of the part and prevents uneven cooling of the bottom surface, but also allows impurities such as oxide scale to be smoothly discharged from the surface of the part through the heat dissipation holes, preventing the accumulation of impurities from affecting the uniformity of cooling.

[0015] Preferably, the transmission mechanism includes: At least one toothed ring is horizontally rotatably mounted on the support frame and is concentrically positioned with respect to the parts placement space; Multiple toothed support plates are connected to the end of each straightening arm furthest from the support end; Multiple sets of transmission gears, each corresponding to a centering arm, and each meshing with a toothed ring and a corresponding toothed support plate, are used to convert the rotation of the toothed ring into the radial reciprocating movement of the toothed support plate; The motor is mounted on a support frame, and a drive gear that meshes with a gear ring is coaxially fixed on its output shaft.

[0016] With the above solution, the transmission between the toothed ring, gear and toothed support plate is smooth, ensuring that multiple straightening arms can move synchronously, which is conducive to achieving precise alignment of parts, making the gaps around the parts more consistent, and the cooling medium is more evenly distributed after spraying.

[0017] Preferably, two sets of toothed rings are arranged parallel to each other at intervals. The motor is a dual-shaft synchronous motor, with a drive gear fixed on each of its two shafts. Each drive gear meshes with a corresponding toothed ring.

[0018] Using the above solution, the dual-axis synchronous motor drives the upper and lower gear rings, and the straightening action is synchronized, resulting in a good centering and straightening effect for the parts.

[0019] Preferably, the straightening end of the straightening arm is provided with a buffer block, which is elastically guided and extended along the straightening direction of the straightening end.

[0020] The above solution incorporates buffer blocks and elastic elements in the straightening arm to mitigate rigid collisions and impacts during the straightening process. This helps protect the surface of the parts from damage and maintains the centered position of the parts, ensuring that the cooling airflow is evenly distributed on the surface of the parts.

[0021] Preferably, the surface of the buffer block is provided with a mounting groove, and a roller protruding from the surface of the buffer block is rotatably mounted in the mounting groove, with the rotation axis of the roller being perpendicular to the axis of the part.

[0022] By adopting the above solution and setting rotatable rollers, the friction between the parts and the buffer block during the slow descent can be reduced.

[0023] Preferably, the device also includes a temperature sensing element and a controller. The temperature sensing element is mounted on the support frame and is used to detect the surface temperature of the parts. The controller is electrically connected to the temperature sensing element, the surrounding cooling section, and the drive mechanism.

[0024] By adopting the above scheme, the temperature of the parts is monitored in real time by temperature sensing elements, and the controller adjusts the operating status of the cooling unit and the drive mechanism according to the temperature information to realize intelligent control of the cooling process. Combined with the centering structure, it is conducive to the smooth and uniform cooling of the parts throughout the process.

[0025] This invention, by employing the above technical solutions, has significant technical effects: The device uses a support frame embedded in a deep well to provide vertical cooling space for heavy parts, helping to improve the situation where heavy shaft parts are prone to tipping over and require long-term use of lifting equipment during vertical cooling. The support heat dissipation section can stably support the parts and accelerate heat dissipation from the bottom, reducing the problem of uneven cooling in the contact area between the parts and the support surface; the surrounding cooling section sprays cooling medium through circumferentially arranged cooling nozzles, which, driven by the drive mechanism, vertically swing the nozzles, allowing the cooling medium to flow more evenly along the circumference and axial direction of the parts; the centering and straightening section can push high-temperature parts that are off-center to the center of the frame and maintain their upright state, making the gaps around the parts more uniform, alleviating the phenomenon of uneven circumferential airflow and large local temperature differences caused by part eccentricity. Combined with the surrounding cooling section, this improves the overall cooling uniformity. This device eliminates the need for close-range manual operation of high-temperature parts, reducing the risk of burns. It also helps to reduce thermal stress concentration in heavy parts, lowering the probability of bending deformation and cracking, shortening the cooling cycle, meeting the personalized cooling process requirements of different rates, and improving the cooling quality after heat treatment. Attached Figure Description

[0026] Figure 1 This is an isometric view of an apparatus for improving the cooling uniformity of heavy parts after heat treatment, according to this embodiment. Figure 2 This is an isometric view of a device for improving the cooling uniformity of heavy parts after heat treatment, as described in this embodiment, after positioning and placing shaft-type parts. Figure 3 This is a top view of an apparatus for improving the cooling uniformity of heavy parts after heat treatment, according to this embodiment. Figure 4 This is a bottom view of an apparatus for improving the cooling uniformity of heavy parts after heat treatment, according to this embodiment. Figure 5 This is a front view of the assembly of the angle adjustment plate and the cooling nozzle in this embodiment; Figure 6 yes Figure 5 A sectional view of AA; Figure 7 This is an isometric view of the alignment arm and transmission gear set in this embodiment. Figure 8 This is a top view of the alignment arm and the transmission gear set in this embodiment. Figure 9 yes Figure 8 A cross-sectional view of BB.

[0027] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Support frame; 2. Base plate; 3. Heat dissipation hole; 4. Motor; 5. Drive gear; 6. Gear ring; 7. Guide rod; 8. Straightening arm; 9. Toothed support plate; 10. Gear B; 11. Gear C; 12. Gear D; 13. Tube shaft; 14. Fixed shaft; 15. Support plate slider; 16. Guide groove; 17. Buffer block; 18. Connecting bolt; 19. Elastic element; 20. Roller; 21. Guide hole; 22. Cooling air nozzle; 221. Air nozzle head; 222. Rear cover; 223. Air nozzle ball head; 23. Angle adjustment plate; 24. Movable groove; 25. Hydraulic cylinder; 26. Air pipe branch; 27. Cooling air pipe. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0029] A device for improving the cooling uniformity of heavy parts after heat treatment is provided. It is suitable for heavy alloy steel shaft parts with a diameter of 650 mm, a length of 9000 mm, and a weight of 23 tons. The parts are cooled by this device after stress relief annealing at 560℃. The bending deformation after cooling is ≤0.5 mm. The cooling is completed within 2 days and the parts can enter the next fine grinding process.

[0030] Reference Figures 1-2 As shown, this device includes a support frame 1, which is a U-shaped vertical shaft frame. It is integrally welded and fixed inside the deep shaft and connected to the wall. The support frame 1 is 0.1-0.3 meters above the ground level, providing a foundation for other components, enhancing structural stability through the wall, and facilitating observation and operation. The ground plane of the deep shaft uses a balanced arrangement of high-strength grid steel plates and solid steel plates to improve the ventilation and heat dissipation of the pit.

[0031] Combination Figures 3-4 As shown, the bottom of the support frame 1 is equipped with a heat dissipation support, which includes a base plate 2 fixedly installed on the support frame 1. The base plate 2 is made of quenched and tempered 45 steel or 42CrMo material, with a flat surface and a hardness lower than the surface hardness of the part after final heat treatment, to avoid damaging the bottom surface of the part during hoisting. Multiple through-holes 3 are evenly distributed on the base plate 2, allowing oxide scale that falls off during the cooling process to fall smoothly to the bottom of the pit, preventing accumulation on the surface of the base plate 2. Cooling air pipes 27 are arranged below the base plate 2 in a serpentine pattern at the bottom of the base plate 2, avoiding the heat dissipation holes 3. One end of the cooling air pipe 27 is connected to the lower annular main air pipe, and the other end extends to the outside of the support frame 1. The cooling medium flows within the cooling air pipes 27, cooling the base plate 2 through heat exchange.

[0032] A centering and straightening unit is installed on the support frame 1. The centering and straightening unit includes a power source, a transmission mechanism, and multiple straightening arms 8 distributed circumferentially along the support frame 1. The power source is a motor 4. In this embodiment, a dual-shaft synchronous motor 4 is used. The main body of the motor 4 is heat-insulated to prevent the radiant heat from high-temperature parts from affecting the service life of the motor 4. The transmission mechanism includes two sets of parallel toothed rings 6 spaced apart vertically, four sets of transmission gears, and four toothed support plates 9.

[0033] The gear ring 6 is horizontally rotatably mounted on the support frame 1 and is concentrically positioned with the parts placement space. Each set of transmission gears corresponds to a toothed support plate 9 and a straightening arm 8. Each set of transmission gears meshes with a gear ring 6 and a toothed support plate 9, respectively, and can convert the rotational motion of the gear ring 6 into the synchronous radial reciprocating movement of the toothed support plate 9.

[0034] There are two sets of straightening arms 8 distributed vertically, with two arms in each set. The two straightening arms 8 in each set are directly opposite each other, and the two sets of straightening arms 8 are distributed at a 90° angle. After combination, they can achieve synchronous engagement in four directions.

[0035] Combination Figures 7-9As shown, the straightening arm 8 is fixedly connected to the front end of the toothed support plate 9 and moves synchronously with the toothed support plate 9. It can smoothly push off-center parts to the center position of the support frame 1 and complete the straightening. The supporting end of the straightening arm 8 is provided with a buffer block 17. The buffer block 17 is connected to the straightening arm 8 through an elastic element 19. The elastic element 19 is a high-elasticity limit spring, which can provide buffer margin during the clamping process and avoid rigid contact damage to the parts. The surface of the buffer block 17 has a mounting groove, in which a roller 20 is rotatably mounted. The rotation axis of the roller 20 is set perpendicular to the axis of the part, which can reduce the friction of the contact surface during the slow descent of the part and prevent the straightening arm 8 from twisting and breaking.

[0036] Each of the two motors has a drive gear 5 coaxially fixed on its four shafts, and each drive gear 5 meshes with a gear ring 6. Each transmission gear set includes a gear B 10 meshing with the gear ring 6, a gear C 11 coaxially fixed with gear B 10, and a gear D 12 rotating on the support frame 1 and meshing with gear C 11. Gear D 12 also meshes with the toothed support plate 9. Gear B 10 and gear C 11 are jointly fixed on a tube shaft 13, which is rotatably mounted on a fixed shaft 14 via bearings. The fixed shaft 14 is fixed to the support frame 1, and a support plate slider 15 is fixed to the upper end of the fixed shaft 14. The support plate slider 15 is guided and engaged with the guide groove 16 at the lower end of the toothed support plate 9 to achieve stable guided movement of the toothed support plate 9.

[0037] The straightening arm 8 has a V-shaped straightening end with the opening facing outwards, increasing the contact area with the outer circle of the part and providing more stable support. The buffer block 17 is also V-shaped. The buffer block 17 is connected to the straightening end of the straightening arm 8 via connecting bolts 18 and elastic elements 19. Specifically, the bolts pass through mounting holes on the buffer block 17 and connect to the straightening end. The elastic element 19 is sleeved on the connecting bolts 18, with both ends elastically abutting against the buffer block 17 and the straightening end, respectively. The roller 20 is a detachable structure. Both ends of its central shaft are fixed to the buffer block 17 with bolts or other fasteners. The roller 20 rotates and is sleeved outside the central shaft, serving as a wear part for easy replacement.

[0038] The V-shaped opening at the centering end of the buffer block 17 is folded outward at both ends to form an extension plate. The extension plates of the two opposing centering arms 8 are arranged in parallel. A guide hole 21 is provided on the extension plate. A guide rod 7 is fixed on the support frame 1. The guide rod 7 passes through the guide hole 21 and forms a sliding guide engagement with the extension plate, so that the centering arm 8 moves stably along the guide rod 7, avoiding swaying and twisting when the centering end moves closer and back at the same time, thus improving the centering accuracy and running stability.

[0039] A surrounding cooling section is also installed on the support frame 1. The surrounding cooling section includes multiple layers of cooling nozzles 22 arranged at intervals along the vertical direction, a drive mechanism for driving the cooling nozzles 22 to swing, and an air supply pipe for supplying air to the cooling nozzles 22. The cooling nozzles 22 are arranged in a row along the vertical direction on each side of the support frame 1, with two nozzles arranged side by side in each row, for a total of eight nozzles per row, evenly distributed circumferentially. Each row of cooling nozzles 22 is provided with an angle adjustment plate 23.

[0040] Reference Figures 5-6 As shown, the cooling nozzle 22 includes a nozzle head 221, a nozzle ball head 223, and a rear cover 222. The rear cover 222 is fixedly mounted on the support frame 1 and has a spherical concave surface inside. One end of the nozzle ball head 223 forms a ball joint with the spherical concave surface, and the other end is fixedly connected to the nozzle head 221, allowing the nozzle head 221 to swing freely at multiple angles. The angle adjustment plate 23 is L-shaped, with its corner facing the corner of the support frame 1. The angle adjustment plate 23 has multiple movable slots 24 spaced apart along the vertical direction. The holes of the movable slots 24 are longitudinally arranged waist-shaped slots, with a length greater than the diameter of the nozzle head 221 and a width equal to the diameter of the nozzle head 221. The nozzle head 221 passes through the corresponding movable slot 24. Each angle adjustment plate 23 on the support frame 1 has a vertical guide groove. Guide bolts are screwed onto each angle adjustment plate 23, passing through the guide grooves to guide and limit the raising and lowering of the angle adjustment plate 23. Combined with... Figure 1 As shown, the drive mechanism includes four sets of hydraulic cylinders 25. The cylinder body of the hydraulic cylinder 25 is installed above the ground plane above the support frame 1 to avoid the influence of high temperature in the pit. The piston rod of the hydraulic cylinder 25 is vertically downward and fixedly connected to the top of an angle adjustment plate 23. All hydraulic cylinders 25 move synchronously, driving all angle adjustment plates 23 to rise and fall synchronously, thereby driving each row of cooling nozzles 22 to swing back and forth synchronously in the vertical plane, realizing the up and down reversing spray of the cooling medium along the axial direction of the part.

[0041] Near the corner of each side wall of the support frame 1, there is a set of two cooling nozzles 22. Each nozzle is connected to a branch pipe 26. The branch pipes 26 are fixed to the support frame 1 by pipe clamps. The upper end of each branch pipe 26 is connected to the upper annular main pipe, which is connected to the air source. One end of the cooling pipe 27 is connected to the lower annular main pipe. The lower and upper annular main pipes are set independently. The two ends of the branch pipes 26 are connected to the upper and lower main pipes respectively. The cooling medium is distributed to each cooling nozzle 22 through the upper annular main pipe and enters the cooling pipe 27 through the lower annular main pipe to perform non-jet cooling of the base plate 2.

[0042] In this embodiment, compressed air is used as the cooling medium. The temperature measuring element is an infrared thermometer gun, which is fixedly installed on the inner wall of the support frame 1 to detect the surface temperature of the parts in real time. The controller is electrically connected to the temperature measuring element, the motor 4, the hydraulic cylinder 25 and the air source control valve, and can automatically adjust the air supply pressure, air supply frequency and the oscillation cycle of the air nozzle 221 according to the real-time temperature data to meet the personalized cooling needs of different parts.

[0043] The complete workflow of the device in this embodiment is as follows: S1. Use a special lifting tool to vertically lift the high-temperature shaft parts that have come out of the heat treatment furnace, move them to the center position above the device, and after the parts are stable, slowly lower them to the contact base plate 2, and then lift them slightly by 10-50mm. S2. Start motor 4. The drive gear 5 on the shaft of motor 4 drives the gear ring 6 to rotate. Through the transmission gear set and the toothed support plate 9, the four sets of straightening arms 8 move radially together synchronously. Under the guidance of the guide rod 7 and the guide groove 16, the part is pushed smoothly to the center of the support frame 1. After the motor 4 reverses slightly, the part is placed smoothly on the base plate 2. Start motor 4 again to make the buffer block 17 fully fit the surface of the part, and complete the automatic centering and straightening. S3. Remove the lifting equipment and the crane, open the air source valve, and the cooling medium is sprayed onto the surface of the part through the air pipe main pipe and air pipe branch pipe 26 via the cooling air nozzle 22; start the hydraulic cylinder 25, drive the L-shaped angle adjustment plate 23 to drive the air nozzle 221 to swing up and down periodically, so that the cooling medium is evenly distributed along the circumference of the part and flows up and down in the axial direction. At the same time, the bottom cooling air pipe 27 simultaneously dissipates heat from the bottom plate 2. S4. The temperature sensing element collects the temperature in real time and transmits it to the controller. The controller independently adjusts the opening of the control valves of each pipeline according to the temperature difference to achieve precise control of the flow rate in each zone. After the parts are cooled, the air source and drive mechanism are turned off, the straightening arm 8 is controlled to return to the initial position, and the parts are lifted off smoothly by the crane to complete the entire cooling process.

[0044] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An apparatus for improving the cooling uniformity of heavy parts after heat treatment, characterized in that, include: A support frame (1) is buried in a deep well to provide vertical cooling space; A heat dissipation support is provided at the bottom of the support frame (1) to support vertically placed parts and accelerate the heat dissipation at the bottom of the parts; The surrounding cooling section is installed on the support frame (1) and is used to spray cooling medium onto the surface of the part. The surrounding cooling section includes cooling nozzles (22) and a drive mechanism. The cooling nozzles (22) are arranged in multiple layers at intervals along the vertical direction of the support frame (1), and multiple nozzles are arranged around the circumference of the support frame (1) in each layer. The drive mechanism is used to drive all the cooling nozzles (22) to swing synchronously. The centering and straightening part is installed on the support frame (1) and is used to push the parts that are off the center of the support frame (1) to its center position and straighten them. The centering and straightening part includes a power source, a transmission mechanism and multiple straightening arms (8) distributed around the support frame (1). The straightening arms (8) are connected to the transmission mechanism and can move synchronously radially through the transmission mechanism under the drive of the power source.

2. The device for improving the cooling uniformity of heavy parts after heat treatment according to claim 1, characterized in that: The cooling nozzle (22) includes a nozzle head (221), a nozzle ball head (223), and a rear cover (222). The rear cover (222) is fixed on the support frame (1). The rear cover (222) has a spherical concave surface inside. One end of the nozzle ball head (223) is ball-jointed with the spherical concave surface, and the other end is fixedly connected to the nozzle head (221).

3. The device for improving the cooling uniformity of heavy parts after heat treatment according to claim 2, characterized in that: The surrounding cooling section also includes multiple angle adjustment plates (23), with each row of cooling nozzles (22) arranged vertically corresponding to an angle adjustment plate (23); the drive mechanism is used to drive all angle adjustment plates (23) to rise and fall synchronously, and the angle adjustment plates (23) drive the corresponding cooling nozzles (22) to swing synchronously.

4. The device for improving the cooling uniformity of heavy parts after heat treatment according to claim 3, characterized in that: Angle adjustment plate (23) is provided with multiple movable slots (24) at intervals along the vertical direction. Air nozzles (221) are inserted into the corresponding movable slots (24) and swing up and down along the vertical plane under the drive of angle adjustment plate (23).

5. The apparatus for improving the cooling uniformity of heavy parts after heat treatment according to claim 1, characterized in that: The heat dissipation support includes a base plate (2) fixed on the support frame (1). The base plate (2) has multiple through heat dissipation holes (3). A cooling air pipe (27) is provided below the base plate (2). The outlet of the cooling air pipe (27) extends to the outside of the support frame (1). The cooling air pipe (27) and the heat dissipation holes (3) are staggered.

6. The apparatus for improving the cooling uniformity of heavy parts after heat treatment according to claim 1, characterized in that: The transmission mechanism includes: At least one toothed ring (6) is horizontally rotatably mounted on the support frame (1) and is concentrically mounted with the part placement space; Multiple toothed support plates (9) are connected to the end of each straightening arm (8) away from the support end; Multiple sets of transmission gears correspond to a central arm (8) and mesh with a toothed ring (6) and a corresponding toothed support plate (9) to convert the rotation of the toothed ring (6) into the radial reciprocating movement of the toothed support plate (9). The motor (4) is mounted on the support frame (1), and a drive gear (5) that meshes with the gear ring (6) is coaxially fixed on its output shaft.

7. The apparatus for improving the cooling uniformity of heavy parts after heat treatment according to claim 6, characterized in that: Two sets of toothed rings (6) are arranged parallel to each other at intervals. The motor (4) is a dual-shaft synchronous motor (4), and a drive gear (5) is fixed on each of its two shafts. Each drive gear (5) meshes with a corresponding toothed ring (6).

8. The apparatus for improving the cooling uniformity of heavy parts after heat treatment according to claim 1, characterized in that: The straightening arm (8) is provided with a buffer block (17) at the straightening end, and the buffer block (17) is elastically guided and extended along the straightening direction of the straightening end.

9. The apparatus for improving the cooling uniformity of heavy parts after heat treatment according to claim 8, characterized in that: The surface of the buffer block (17) is provided with a mounting groove, and a roller (20) protruding from the surface of the buffer block (17) is rotatably mounted in the mounting groove. The rotation axis of the roller (20) is set perpendicular to the axis of the part.

10. The apparatus for improving the cooling uniformity of heavy parts after heat treatment according to claim 1, characterized in that: It also includes a temperature measuring element and a controller. The temperature measuring element is mounted on the support frame (1) and is used to detect the surface temperature of the parts. The controller is electrically connected to the temperature measuring element, the surrounding cooling section and the drive mechanism respectively.

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