A controlled cooling device for heavy castings

Abstract

The application relates to a controlled cooling device for thick castings and relates to the technical field of casting cooling control. The device comprises a rack, a controlled cooling main body, a heat insulation support assembly, a cooling circulation system, a gas preheating system and a temperature monitoring assembly. The controlled cooling main body comprises a controlled cooling shell, a controlled cooling inner shell, a refrigeration channel, a liquid inlet and a liquid outlet and radiating fins. The liquid inlet and the liquid outlet are respectively connected with the external cooling circulation system. The controlled cooling device circulates cooling liquid in the refrigeration channel between the controlled cooling shell and the controlled cooling inner shell, transmits the cold quantity to the external air through the peripheral radiating fins, places the casting in the center of the controlled cooling main body through the heat insulation support assembly, indirectly contacts the casting with the cooling circulation system through the controlled cooling inner shell, realizes non-contact cooling, adjusts the cooling liquid temperature through the gas preheating system according to actual requirements, and ensures that the cooling process is smoothly conducted and the expected cooling effect is achieved.

Description

Technical Field

[0001] This application relates to the technical field of casting cooling control, and in particular to a cooling control device for thick castings. Background Technology

[0002] In the production of thick castings, to achieve rapid cooling of the thick sections and obtain a defect-free microstructure that meets hardness requirements, traditional methods typically involve placing either exposed or concealed chills at the corresponding locations. The exposed chills are in direct contact with the molten iron, causing rapid cooling of the molten iron at the contact area. This results in a significant difference in the microstructure between the chilled and non-chilled areas. This difference not only leads to color differences between the chilled and non-chilled surfaces during machining (i.e., color difference), but also results in poor machinability at the color-difference area, severely impacting the subsequent processing and performance of the casting.

[0003] To address these issues, the chilled iron is often thoroughly baked during production to remove adsorbed moisture or gases from its surface. However, improper baking can cause these moisture or gases to vaporize rapidly upon contact with the high-temperature molten iron, creating porosity defects and reducing the yield rate of castings. This unstable cooling process not only increases production costs but also limits the improvement of quality and production efficiency for thick castings.

[0004] In summary, the application of open chills in traditional methods has many problems, such as color differences and decreased machinability due to microstructure differences, as well as porosity defects caused by improper baking. These are all key technical problems that urgently need to be solved in the production of thick and large castings. Utility Model Content

[0005] In order to address the problems inherent in the design of current controlled cooling devices for thick castings, the inventors have found that the application of open chills in traditional methods has many issues, such as color differences and decreased processing performance due to microstructure variations, as well as porosity defects caused by improper baking. Therefore, this application provides a controlled cooling device for thick castings.

[0006] The cooling control device for thick castings provided in this application adopts the following technical solution: it includes a frame, a cooling control body located in the middle of the frame, a heat insulation support assembly for supporting the casting, a cooling circulation system connected to the cooling control body, a gas preheating system for adjusting the temperature gradient of the cooling circulation system, and a temperature monitoring assembly. The cooling control body includes a cooling control outer shell, a cooling control inner shell disposed in the inner cavity of the cooling control outer shell, a cooling channel disposed between the cooling control inner shell and the cooling control outer shell, a liquid inlet connected to one side of the cooling channel, a liquid outlet connected to the other side of the cooling channel, and heat dissipation fins arrayed on the outer periphery of the cooling control outer shell. The liquid inlet and the liquid outlet are respectively connected to an external cooling circulation system.

[0007] By adopting the above technical solution, coolant circulates in the cooling channel between the cooling outer shell and the cooling inner shell, and the cooling capacity is transferred to the outside air through the heat dissipation fins on the outer periphery. At the same time, the heat insulation support assembly places the casting in the center of the cooling body, so that the casting is indirectly in contact with the cooling circulation system through the cooling inner shell, realizing non-contact cooling. The cooling circulation system adjusts the coolant temperature according to actual needs through the gas preheating system to ensure that the cooling process proceeds smoothly and meets the expected cooling effect.

[0008] As a preferred embodiment, the heat insulation support assembly includes an adjustable bracket with a hollow structure and an adjustment component for adjusting the adjustable bracket, the adjustment component including a connecting component and a braking component.

[0009] By adopting the above technical solution, the hollow adjustable bracket in the thermal insulation support assembly is mainly used to increase the ventilation and weight reduction of the support structure, reduce the heat transfer of materials, and improve the thermal insulation effect.

[0010] As a preferred embodiment, the connecting assembly includes several support rods, a traction rod, and a mounting base disposed on the adjustable card holder; One end of the support rod is provided with an arc-shaped slot to engage with the outer wall of the cooling housing, and a high-temperature resistant adhesive is used to bond and fix it at the connection point.

[0011] By adopting the above technical solution, firstly, the cooling housing is fixed by the support rod and the arc-shaped slot, ensuring the stability of the support rod position; As a preferred embodiment, the other end of the support rod is hinged to the traction rod, and the other end of the traction rod is hinged to the mounting seat fixedly mounted on the adjustable card seat.

[0012] By adopting the above technical solution, the support rod and the traction rod move relative to each other through the hinge point, allowing the position of the adjustable bracket to be adjusted. The traction rod transmits the adjustment displacement of the cooling shell to the adjustable bracket through the hinge point with the mounting base, realizing the precise adjustment and positioning of the entire device, thereby meeting the needs of different application scenarios.

[0013] As a preferred embodiment, the braking assembly includes a screw rotatably connected to one end of the adjustable card holder, an adjusting sleeve fixedly disposed in the inner cavity of the cooling inner shell and adapted to the screw, a guide seat fixedly disposed at the other end of the adjustable card holder, and a guide rod slidably connected to the guide seat. The lower end face of the guide rod is fixedly connected to the lower end face of the inner cavity of the cooling inner shell, and the guide seat is provided with a sliding hole adapted to the guide rod.

[0014] By adopting the above technical solution, the distance between the adjustable bracket and the bottom surface of the controlled-cooling inner shell can be changed by adjusting the relative positions of the screw and the adjusting sleeve, thus adapting to castings of different shapes. Meanwhile, the traction rod and hinge structure ensure the flexibility and stability of the support assembly during adjustment. This design not only expands the applicability of the support assembly but also enhances the thermal insulation effect.

[0015] As a preferred embodiment, the cooling circulation system includes: a liquid storage tank, a pump body, a delivery pipe, and a discharge pipe; The liquid inlet is connected in sequence to the delivery pipeline, the pump body and the liquid storage tank; The liquid outlet is connected back to the storage tank through a discharge pipe, forming a closed cooling circuit.

[0016] By adopting the above technical solution, the coolant circulates during storage, transportation, cooling and return through the continuous operation of the pump, effectively removing heat from the cooled components and maintaining the normal operation and efficient heat dissipation of the system.

[0017] As a preferred embodiment, the gas preheating system includes an inert gas storage tank, a preheater, a guide pipe, and an annular jet frame.

[0018] A connecting pipe is provided between the inert gas storage tank and the inlet of the preheater, and the preheater is configured as an electrically heated type; The guide pipe is disposed between the preheater outlet and the annular jet frame; The annular jet frame is arranged around the inner cavity of the cooling housing near the edge, with its outlet facing the cooling channel and spraying preheated inert gas at an angle of 30°-45°. The annular jet frame is fixed to the inner cavity of the cooling housing by a bracket and faces the cooling channel.

[0019] By adopting the above technical solution, firstly, inert gas is provided by a storage tank and transferred to a preheater; then, the preheater heats the gas to the required temperature by electric heating; the heated gas is transported to an annular jet frame through a guide pipe; finally, the preheated inert gas ejected from the annular jet frame is precisely sprayed into the refrigeration channel at a specific angle to preheat the refrigeration channel, thereby improving its working environment and enhancing the overall performance and efficiency of the equipment.

[0020] As a preferred embodiment, the temperature monitoring component includes a plurality of temperature sensors and a temperature display electrically connected to the temperature sensors; Each of the temperature sensors is configured as a thermocouple sensor, with its sensing end extending through the side wall of the cooling housing to the outer surface of the inner cooling housing, and a ceramic insulating layer provided at the connection point with the cooling housing. The temperature display is located on the outside of the cooling housing and is connected to the temperature sensor via a wire.

[0021] By employing the above technical solution, each thermocouple sensor is responsible for detecting the temperature of the outer surface of the cooling inner shell and transmitting the detection signal to a temperature display located on the outside of the cooling outer shell via a wire. A ceramic insulating layer is placed at the connection point between the temperature sensor and the cooling outer shell, providing excellent insulation and temperature isolation, ensuring that the sensor can accurately detect the temperature without being interfered with by the heat of the outer shell. The temperature display then converts the received signal into a clear temperature reading, displayed on the outside of the cooling outer shell, allowing operators to clearly observe the real-time temperature of the outer surface of the cooling inner shell.

[0022] As a preferred embodiment, the system also includes a controller fixedly connected to the rack, the controller being configured as a microprocessor and electrically connected to the temperature monitoring components and the pump body.

[0023] By adopting the above technical solution, the basic cooling intensity is controlled by the controller to control the flow rate of coolant delivered to the pump body, the cooling gradient is adjusted by the temperature of the preheated inert gas, and the temperature monitoring component provides real-time data feedback, so as to achieve gradient cooling of the thick parts of the casting from the surface to the inside.

[0024] In summary, this application includes the following beneficial technical effects: 1. The cooling channel between the cooling outer shell and the cooling inner shell is responsible for circulating and transferring the coolant to the surface of the casting to achieve efficient heat dissipation; the heat insulation support assembly is used to support the casting, prevent heat conduction, and ensure that the casting does not contact the cooling body during the cooling process, thus achieving non-contact cooling; 2. The cooling circulation system is connected to the refrigeration channel of the device through the liquid inlet and liquid outlet to realize the circulation of coolant; the gas preheating system adjusts the temperature gradient of the cooling circulation system as needed to meet different cooling requirements; 3. The temperature monitoring component is used to monitor temperature changes in real time during the cooling process. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a controlled cooling device for thick castings according to this application; Figure 2 This is a schematic diagram of the cooling body in a cooling control device for thick castings according to this application; Figure 3 This application relates to a controlled cooling device for thick castings. Figure 2 A structural schematic diagram of the enlarged view at point A; Figure 4 This application relates to a controlled cooling device for thick castings. Figure 2 A structural schematic diagram of the front view; Figure 5 This is a schematic diagram of the structure of the regulating component in a controlled cooling device for thick castings according to this application.

[0026] Explanation of reference numerals in the attached drawings: 100, frame; 21, cooling outer shell; 211, heat dissipation fins; 22, cooling inner shell; 23, refrigeration aisle; 31, liquid storage tank; 32, delivery pipe; 321, pump body; 33, discharge pipe; 41, inert gas storage tank; 42, guide pipe; 421, preheater; 43, annular jet frame; 51, temperature sensor; 52, temperature display; 61, adjustable mounting bracket; 611, mounting base; 621, adjusting screw sleeve; 622, guide seat; 71, support rod; 72, traction rod; 81, screw; 82, guide rod. Detailed Implementation

[0027] The present application will be further described in detail below with reference to the accompanying drawings.

[0028] Please refer to the details. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This application discloses a controlled cooling device for thick castings. It includes a frame 100, a controlled cooling body located in the middle of the frame 100, a heat-insulating support assembly for supporting the casting, a cooling circulation system connected to the controlled cooling body, a gas preheating system for adjusting the temperature gradient of the cooling circulation system, and a temperature monitoring assembly. Please refer to the details. Figure 2 and Figure 3The cooling control body includes a cooling control outer shell 21, a cooling control inner shell 22 disposed within the cavity of the cooling control outer shell 21, a cooling channel 23 disposed between the cooling control inner shell 22 and the cooling control outer shell 21, a liquid inlet connected to one side of the cooling channel 23, a liquid outlet connected to the other side of the cooling channel 23, and heat dissipation fins arrayed around the outer periphery of the cooling control outer shell. The liquid inlet and liquid outlet are respectively connected to an external cooling circulation system. The cooling channel 23 between the cooling control outer shell 21 and the cooling control inner shell 22 is responsible for circulating and transferring coolant to the surface of the casting to achieve efficient heat dissipation. The heat insulation support assembly is used to support the casting, prevent heat conduction, and ensure that the casting does not contact the cooling control body during the cooling process, achieving non-contact cooling. The cooling circulation system is connected to the cooling channel 23 of the device through the liquid inlet and liquid outlet to realize the circulation of coolant. The gas preheating system adjusts the temperature gradient of the cooling circulation system as needed to meet different cooling requirements. The temperature monitoring assembly is used to monitor temperature changes in real time during the cooling process. The working principle is as follows: coolant circulates in the cooling channel 23 between the cooling outer shell 21 and the cooling inner shell 22, and the cooling capacity is transferred to the outside air through the heat dissipation fins on the outer periphery. At the same time, the heat insulation support assembly places the casting in the center of the cooling body, so that the casting is indirectly in contact with the cooling circulation system through the cooling inner shell 22, realizing non-contact cooling. The cooling circulation system adjusts the coolant temperature according to actual needs through the gas preheating system to ensure that the cooling process proceeds smoothly and meets the expected cooling effect.

[0029] Please refer to the details. Figure 2 and Figure 5 The thermal insulation support assembly includes an adjustable bracket 61 with a hollow structure and an adjustment component for adjusting the adjustable bracket 61. The adjustment component includes a connecting component and a braking component. The adjustable bracket 61 with a hollow structure in the thermal insulation support assembly is mainly used to increase the ventilation and weight of the support structure, reduce the heat transfer of the material, and improve the thermal insulation effect.

[0030] The connecting assembly includes several support rods 71, a traction rod 72, and a mounting base 611 disposed on the adjustable card holder 61; One end of the support rod 71 is provided with an arc-shaped slot to engage with the outer wall of the cooling housing 21, and a high-temperature resistant adhesive is provided at the connection point to fix it. First, the cooling housing 21 is fixed by the support rod 71 and the arc-shaped slot to ensure the stability of the position of the support rod 71. The other end of the support rod 71 is hinged to the traction rod 72, and the other end of the traction rod 72 is hinged to the mounting base 611 fixed on the adjustable mounting base 61. The support rod 71 and the traction rod 72 move relative to each other through the hinge point, allowing the position of the adjustable mounting base 61 to be adjusted. The traction rod 72 transmits the adjustment displacement of the cooling housing 21 to the adjustable mounting base 61 through the hinge point with the mounting base 611, so as to realize the precise adjustment and positioning of the whole device, thereby meeting the needs of different application scenarios.

[0031] Please refer to the details. Figure 2 and Figure 5 The braking assembly includes a screw 81 rotatably connected to one end of the adjustable bracket 61, an adjusting sleeve 621 fixedly disposed in the inner cavity of the cooling inner shell 22 and adapted to the screw 81, a guide seat 622 fixedly disposed at the other end of the adjustable bracket 61, and a guide rod 82 slidably connected to the guide seat 622. The lower end face of the guide rod 82 is fixedly connected to the lower end face of the inner cavity of the cooling inner shell. The guide seat 622 is provided with a sliding hole adapted to the guide rod 82. The adjustment assembly includes a screw 81, an adjusting sleeve 621, a guide seat 622, and a guide rod 82. The screw 81 is rotatably connected to one end of the adjustable bracket 61, and the opposite end is the adjusting sleeve 621 inside the cooling inner shell 22. The two fit together and the gap can be adjusted as needed. The guide seat 622 is fixed to the other end of the adjustable bracket 61, and the guide rod 82 slides inside it. The lower end contacts the inner cavity of the cooling inner shell 22 to ensure the stability and flexibility of the support assembly. The overall working principle is as follows: by adjusting the relative positions of the screw 81 and the adjusting sleeve 621, the distance between the adjustable bracket 61 and the bottom surface of the cooling inner shell 22 is changed, thus adapting to castings of different shapes. Meanwhile, the traction rod 72 and the hinge structure ensure the flexibility and stability of the support assembly during adjustment. This design not only expands the applicability of the support assembly but also enhances the heat insulation effect.

[0032] Please refer to the details. Figure 1 , Figure 2 and Figure 3 The cooling circulation system includes: a liquid storage tank 31, a pump body 321, a delivery pipe 32, and a discharge pipe 33; The liquid inlet is connected in sequence to the delivery pipe 32, the pump body 321 and the liquid storage tank 31; Please refer to the details. Figure 2 and Figure 3 The coolant outlet is connected back to the storage tank 31 via the discharge pipe 33, forming a closed cooling loop. The storage tank 31 stores coolant to ensure sufficient coolant in the system. The pump 321 draws coolant from the storage tank 31 through the delivery pipe 32 and pumps it to the components requiring cooling. The delivery pipe 32 then delivers the coolant to the refrigeration channel 23 to improve cooling efficiency. The discharge pipe 33 returns the cooled liquid to the storage tank 31, creating a closed loop in the system for continuous cooling. Through the continuous operation of the pump 321, the coolant circulates during storage, delivery, cooling, and return, effectively removing heat from the cooled components and maintaining normal system operation and efficient heat dissipation.

[0033] Please refer to the details. Figure 1 and Figure 4The gas preheating system includes an inert gas storage tank 41, a preheater 421, a guide pipe 42, and an annular jet rack 43. A connecting pipe is provided between the inert gas storage tank 41 and the inlet of the preheater 421, and the preheater 421 is configured as an electrically heated type. The guide pipe 42 is located between the outlet of the preheater 421 and the annular jet frame 43; An annular jet ejector 43 is positioned around the inner cavity of the cooling housing near the edge, with its outlet facing the cooling channel 23 and injecting preheated inert gas at an angle of 30°-45°. The annular jet ejector 43 is fixed to the inner cavity of the cooling housing 21 by a bracket and faces the cooling channel 23. An inert gas storage tank 41 is used to store and supply the required inert gas; a preheater 421 raises the temperature of the inert gas by electric heating; a guide pipe 42 is responsible for guiding the preheated gas to the annular jet ejector 43; the annular jet ejector 43 then injects the preheated inert gas at an angle of 30°-45° into the cooling channel 23 near the edge of the inner cavity of the cooling housing. Its working principle is as follows: First, inert gas is provided by the storage tank and transferred to the preheater 421; then, the preheater 421 heats the gas to the required temperature by electric heating; the heated gas is transported to the annular jet frame 43 through the guide pipe 42; finally, the preheated inert gas ejected from the annular jet frame 43 is precisely sprayed into the refrigeration channel 23 at a specific angle to preheat the refrigeration channel 23, thereby improving its working environment and enhancing the overall performance and efficiency of the equipment.

[0034] Please refer to the details. Figure 2 and Figure 4 The temperature monitoring component includes several temperature sensors 51 and a temperature display 52 electrically connected to the temperature sensors 51; Each temperature sensor 51 is configured as a thermocouple sensor, with its sensing end extending through the side wall of the cooling housing 21 to the outer surface of the cooling inner housing 22, and a ceramic insulating layer provided at the connection point with the cooling housing 21. A temperature display 52 is located on the outside of the cooling housing 21 and connected to the temperature sensor 51 via wires. Each thermocouple sensor is responsible for detecting the temperature of the outer surface of the cooling inner housing 22 and transmitting the detection signal to the temperature display 52 located on the outside of the cooling housing 21 via wires. A ceramic insulating layer is located at the connection between the temperature sensor 51 and the cooling housing 21, providing good insulation and temperature isolation, ensuring that the sensor can accurately detect the temperature without being interfered with by the heat of the housing. The temperature display 52 converts the received signal into a clear temperature reading and displays it on the outside of the cooling housing 21, allowing the operator to clearly observe the real-time temperature of the outer surface of the cooling inner housing 22.

[0035] Please refer to the details. Figure 1It also includes a controller fixedly connected to the frame 100. The controller is configured as a microprocessor and is electrically connected to the temperature monitoring component and the pump body 321. The controller controls the basic cooling intensity by controlling the flow rate of coolant delivered to the pump body 321, adjusts the cooling gradient by preheating the inert gas temperature, and provides real-time data feedback through the temperature monitoring component to achieve gradient cooling of the thick parts of the casting from the surface to the inside.

[0036] The implementation principle of a cooling control device for thick castings in this application embodiment is as follows: coolant is circulated in the cooling channel 23 between the cooling control outer shell 21 and the cooling control inner shell 22, and the cooling capacity is transferred to the outside air through the heat dissipation fins on the outer periphery. At the same time, the heat insulation support assembly places the casting in the center of the cooling control body, so that the casting is indirectly in contact with the cooling circulation system through the cooling control inner shell 22, thereby achieving non-contact cooling. By adjusting the relative positions of the screw 81 and the adjusting sleeve 621, the distance between the adjustable bracket 61 and the bottom surface of the cooling inner shell 22 is changed, thereby adapting to castings of different shapes. At the same time, the traction rod 72 and the hinge structure ensure the flexibility and stability of the support components during the adjustment process. The coolant tank 31 stores coolant to ensure sufficient coolant in the system; the pump 321 draws coolant from the coolant tank 31 through the delivery pipe 32 and pumps it to the components that need cooling; the delivery pipe 32 delivers coolant to the refrigeration channel 23 to improve cooling efficiency; the discharge pipe 33 returns the cooled liquid to the coolant tank 31, forming a closed loop in the system to achieve continuous cooling. First, inert gas is supplied by the storage tank and transferred to the preheater 421; then, the preheater 421 heats the gas to the required temperature using electric heating; the heated gas is delivered to the annular jet 43 through the guide pipe 42; finally, the preheated inert gas ejected from the annular jet 43 is precisely sprayed at a specific angle into the refrigeration channel 23 to preheat the refrigeration channel 23, improve the temperature gradient within the refrigeration channel 23, and thus improve its working environment.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A controlled cooling device for thick castings, characterized in that: It includes a frame (100), a cooling control body located in the middle of the frame (100), a heat insulation support assembly for supporting the casting, a cooling circulation system connected to the cooling control body, a gas preheating system for adjusting the temperature gradient of the cooling circulation system, and a temperature monitoring assembly. The cooling control body includes a cooling control outer shell (21), a cooling control inner shell (22) disposed in the inner cavity of the cooling control outer shell (21), a cooling channel (23) disposed between the cooling control inner shell (22) and the cooling control outer shell (21), a liquid inlet connected to one side of the cooling channel (23), a liquid outlet connected to the other side of the cooling channel (23), and heat dissipation fins (211) arrayed on the outer periphery of the cooling control outer shell. The inlet and outlet are respectively connected to an external cooling circulation system.

2. The controlled cooling device for thick castings according to claim 1, characterized in that: The heat insulation support assembly includes an adjustable bracket (61) with a hollow structure and an adjustment assembly for adjusting the adjustable bracket (61), the adjustment assembly including a connecting assembly and a braking assembly.

3. A controlled cooling device for thick castings according to claim 2, characterized in that: The connecting assembly includes several support rods (71), traction rods (72), and mounting bases (611) disposed on the adjustable card holder (61). One end of the support rod (71) is provided with an arc-shaped slot to engage with the outer wall of the cooling housing (21), and a high-temperature resistant adhesive is provided at the connection point to fix it. The other end of the support rod (71) is hinged to the traction rod (72), and the other end of the traction rod (72) is hinged to the mounting seat (611) fixed on the adjustable card seat (61).

4. A controlled cooling device for thick castings according to claim 3, characterized in that: The braking assembly includes a screw (81) rotatably connected to one end of the adjustable card holder (61), an adjusting sleeve (621) fixedly disposed in the inner cavity of the cooling inner shell and adapted to the screw (81), a guide seat (622) fixedly disposed at the other end of the adjustable card holder (61), and a guide rod (82) slidably connected to the guide seat (622).

5. A controlled cooling device for thick castings according to claim 4, characterized in that: The lower end face of the guide rod (82) is fixedly connected to the lower end face of the inner cavity of the cooling inner shell, and the guide seat (622) is provided with a sliding hole that is compatible with the guide rod (82).

6. A controlled cooling device for thick castings according to claim 5, characterized in that: The cooling circulation system includes: a liquid storage tank (31), a pump body (321), a delivery pipe (32), and a discharge pipe (33); The liquid inlet is connected in sequence to the delivery pipe (32), the pump body (321) and the storage tank (31). The outlet is connected back to the storage tank (31) via a discharge pipe (33).

7. A controlled cooling device for thick castings according to claim 6, characterized in that: The gas preheating system includes an inert gas storage tank (41), a preheater (421), a guide pipe (42), and an annular jet rack (43). A connecting pipe is provided between the inert gas storage tank (41) and the inlet of the preheater (421), and the preheater (421) is configured as an electric heating type; The guide pipe (42) is disposed between the outlet of the preheater (421) and the annular jet frame (43); The annular jet frame (43) is arranged around the inner cavity of the cooling housing near the edge, with its outlet facing the cooling channel (23) and spraying preheated inert gas at an angle of 30°-45°.

8. A controlled cooling device for thick castings according to claim 7, characterized in that: The temperature monitoring component includes a plurality of temperature sensors (51) and a temperature display (52) electrically connected to the temperature sensors (51). Each of the temperature sensors (51) is configured as a thermocouple sensor, with its sensing end extending through the side wall of the cooling housing (21) to the outer surface of the cooling inner housing (22), and a ceramic insulating layer provided at the connection point with the cooling housing (21). The temperature display (52) is located on the outside of the cooling housing (21) and connected to the temperature sensor (51) via a wire.

9. A controlled cooling device for thick castings according to claim 8, characterized in that: It also includes a controller fixedly connected to the rack (100), the controller being configured as a microprocessor and electrically connected to the temperature monitoring assembly and the pump body (321).

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