Flexible inner spray quench for semi-closed closed-end cylindrical shell

Abstract

This invention discloses a flexible internal spray cooling device for semi-enclosed cylindrical cavity shells, comprising internal spray nozzles. The number and layout of the internal spray nozzles are set according to the specific structure of the cavity shell. Typically, multiple rows or staggered rows are distributed around the inner wall of the variable cross-section semi-enclosed cylindrical cavity shell. In the non-working state, the internal spray nozzles are in a retracted state, and their maximum size is smaller than the maximum closing size at both ends of the cylindrical cavity shell. In the working state, the internal spray nozzles are in an extended state, and their maximum size is smaller than the minimum size of the inner cavity of the cylindrical cavity shell. This device is used to uniformly spray cool the inner wall of the variable cross-section semi-enclosed cylindrical cavity shell. This invention effectively solves the problems of small closing diameter of the cylindrical cavity shell, inability of existing internal spray cooling devices to enter, asynchronous quenching, large quenching deformation, and uneven hardness distribution.

Description

Technical Field

[0001] This invention relates to the field of heat treatment of metallic materials, and in particular to a flexible internal spray quenching device for semi-enclosed cylindrical cavity shell parts, which is especially suitable for cylindrical cavity shell parts with small opening diameter and complex inner wall structure. Background Technology

[0002] Cylindrical shell components with partially tapered structures, made of materials such as steel or aluminum alloys, are widely used in aerospace, transportation, energy, and medical fields. Typical examples of semi-tapered cylindrical shell components include solid rocket motor casings, engine crankshaft sleeves, and cylindrical shell components for storing and transporting various gases / liquids. These cylindrical shell components typically have a large length-to-diameter ratio, thin wall thickness, and often feature numerous reinforcing ribs and bosses, as well as complex internal wall structures. During the quenching process, due to the special shape of the workpiece, problems such as uneven cooling rates, asynchronous quenching, large quenching deformation, uneven hardness distribution, and cracking are easily caused, resulting in a high scrap rate.

[0003] Traditional quenching of cylindrical cavity shell parts typically employs an immersion quenching heat treatment process. For example, CN206015010U discloses a quenching device for aluminum alloy inner liner of gas cylinders, in which the inner liner is directly and rapidly immersed in a quenching tank after solution treatment. Clearly, this traditional quenching tank immersion quenching process cannot achieve synchronous cooling of the inner and outer surfaces of such cylindrical cavity shell parts. Therefore, it is difficult to guarantee the cooling rate and uniformity, leading to problems such as uneven hardness distribution and large deformation. Especially for semi-enclosed, tapered cylindrical cavity shell parts with large length-to-diameter ratios and complex internal wall structures, effectively achieving uniform cooling is even more challenging.

[0004] To address the aforementioned problems, one common method is to use internal or external support structures to constrain the shape of the workpiece and reduce quenching deformation. For example, CN112410522B discloses a quenching fixture, and CN116770042A discloses a quenching device and method for cylindrical workpieces, both of which constrain the workpiece through external or internal / external support structures to reduce quenching deformation. While this method is effective in reducing workpiece deformation, it still has some drawbacks. For instance, the design and manufacturing of the support structure requires precise customization based on the shape and dimensions of the workpiece to ensure effective constraint, undoubtedly increasing the complexity of the process; the stress distribution of the support structure may also lead to localized deformation or stress concentration in the material, affecting workpiece quality. Furthermore, for cylindrical cavity shells with small opening diameters, the design and removal of the internal support structure is even more difficult.

[0005] Another solution is to use an external spray and internal spray quenching device. This involves spraying cooling onto the outer wall of the cylindrical cavity shell while simultaneously jet cooling onto the inner wall. The cooling rate and uniformity can be adjusted by controlling the nozzle arrangement and the flow rate of the cooling medium, effectively reducing uneven cooling rates and large quenching deformation caused by localized wall thickness differences. However, existing internal spray quenching devices are generally suitable for through-type cylindrical cavity shells with openings at both ends, or cylindrical cavity shells with one open end and a large diameter. They are not suitable for cylindrical cavity shells with constricted openings. Especially for constricted cylindrical cavity shells with small constricted openings and complex inner wall structures, the small constricted opening prevents the internal spray quenching device from entering, resulting in compromised quenching quality. Summary of the Invention

[0006] In view of the above and / or existing problems of internal spray quenching devices, the purpose of this invention is to provide a flexible internal spray quenching device for semi-enclosed cylindrical cavity shells, which can meet the requirement of synchronous and uniform cooling of local wall thickness differences in cylindrical cavity shells with different materials and structural characteristics. It effectively solves the problems of small opening diameter of cylindrical cavity shells, inability of existing internal spray quenching devices to enter, asynchronous quenching, large quenching deformation, and uneven hardness distribution. It can obtain cylindrical cavity shells with small envelope circle diameter deviation, good straightness and uniform performance.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: a flexible internal spray quenching device for a semi-enclosed cylindrical cavity shell, comprising internal spray nozzles. The number and layout of the internal spray nozzles are set according to the specific structure of the cavity shell. Typically, they are arranged in multiple rows or staggered rows around the inner wall of the semi-enclosed cylindrical cavity shell with a variable cross-section. In the non-working state, the internal spray nozzles are in a retracted state, and their maximum size is smaller than the maximum closing size at both ends of the cylindrical cavity shell. In the working state, the internal spray nozzles are in an extended state, and their maximum size is smaller than the minimum size of the inner cavity of the cylindrical cavity shell. This device is used to uniformly spray and cool the inner wall of the semi-enclosed cylindrical cavity shell with a variable cross-section.

[0008] As described above, in the non-working state, the internal spray nozzle is in a retracted state, and its maximum size is smaller than the maximum closing size at both ends of the constricted cylindrical cavity shell. This ensures that the internal spray quenching device can easily enter and exit the constricted cylindrical cavity shell without being limited by the closing size. In the working state, the internal spray nozzle of the internal spray quenching device is in an extended state. At this time, its maximum size is smaller than the minimum size of the inner cavity of the constricted cylindrical cavity shell. This ensures that the device can smoothly enter the inner cavity of the constricted cylindrical cavity shell and uniformly cool the entire inner cavity.

[0009] Optionally, each of the inner spray nozzles is hinged to a lifting steel cable, and each lifting steel cable is driven to rise and fall by a separate hydraulic cylinder. This is used to move the lifting steel cable by the hydraulic cylinder, thereby precisely controlling the longitudinal height of the inner spray nozzle to adapt to the specific longitudinal height and spray angle required by the inner wall of the workpiece.

[0010] As described above, the hydraulic cylinder extends or retracts at a specific size, and the lifting cable slides between the upper and lower sets of pulleys, driving the internal spray nozzle to be precisely positioned at a specific angle to adapt to the longitudinal height and spray angle required by the inner wall of the workpiece.

[0011] Optionally, the spray angle of the internal spray nozzle is adjustable in the range of 15° to 150°; the adjustable medium flow rate of the internal spray nozzle is in the range of 1 to 200 L / min; and the adjustable medium pressure of the internal spray nozzle is in the range of 0.05 to 0.8 MPa.

[0012] As shown above, by adjusting parameters such as the flow rate, pressure, angle, and time of the quenching medium, and coordinating internal and external spray quenching, the uniform cooling requirements of cylindrical cavity shell parts with different materials and structural characteristics can be met.

[0013] Optionally, it also includes an external spray nozzle, which is spirally arranged around the inner wall of the quenching tank and is used to spray cooling medium on the outer wall circumferential surface of the constricted cylindrical cavity to cool it.

[0014] As described above, the internal spray quenching device provided by the present invention can spray cool the circumference of the inner wall of a semi-enclosed cylindrical cavity shell with variable cross-section. Combined with the spiral external spray nozzles arranged in the circumference of the quenching tank, the device sprays cools the circumference of the outer wall of the cylindrical cavity shell, thereby further improving the cooling uniformity of the cylindrical cavity shell, controlling the quenching deformation, meeting the requirements for high-quality production of cylindrical cavity shells, and having high adaptability.

[0015] Optionally, it also includes a base, the base having a water inlet inside, one end of the water inlet being connected to an independent water inlet pipe for each internal spray nozzle, and the other end being connected to an internal spray circulation pipe, the internal spray circulation pipe being a piping system for transporting cooling medium to the internal spray nozzles.

[0016] As described above, each internal spray nozzle is equipped with a corresponding water inlet pipe, and the cooling medium can be transported to the internal spray nozzle pipeline system through the internal spray circulation pipe, so that the cooling medium can be recycled.

[0017] Optionally, it also includes flow control valves for adjusting the flow rate of the cooling medium in the nozzles, with an independent flow control valve on each circulation line for precise adjustment as needed.

[0018] As shown above, all the circulating pipelines connected to the nozzles are equipped with independent flow control valves, which are connected to the control system, allowing for real-time monitoring and precise adjustment according to production needs.

[0019] Optionally, it also includes a flow meter for measuring the actual flow rate of the nozzle. Each circulation pipeline is equipped with a flow meter at the front end of a flow control valve to monitor the flow rate of the cooling medium in real time, thereby accurately controlling the actual flow rate of the quenching medium.

[0020] As shown above, all the circulating pipelines connected to the nozzles are equipped with flow meters, which are connected to the control system to realize real-time monitoring and adjustment of the flow set value and the measured value, thereby accurately controlling the actual flow rate of the quenching medium.

[0021] Therefore, the flexible internal spray quenching device for semi-enclosed cylindrical cavity shell parts of the present invention has at least the following beneficial effects:

[0022] This invention features automated flexible adjustment, allowing for flexible adjustment of the extension and retraction of each internal spray nozzle, as well as parameters such as nozzle longitudinal height, quenching medium flow rate, pressure, angle, and time. Combined with external wall spray quenching, it can meet the requirement of synchronous and uniform cooling of various parts of cylindrical cavity shells with different materials and structural characteristics. This effectively solves problems such as the small opening diameter of closed cylindrical cavity shells, the inability of existing internal spray quenching devices to enter, asynchronous quenching, large quenching deformation, and uneven hardness distribution, thus meeting the requirements for high-quality production of closed cylindrical cavity shells. This internal spray quenching device has a compact structure, is easy to operate, and has high adaptability. It can be applied to semi-enclosed closed cylindrical cavity shells of various structures and sizes, exhibiting high versatility and significant economic benefits. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0024] Figure 1 This is a schematic diagram of the internal spray quenching device in a non-working state inside the quenching tank.

[0025] Figure 2 This is a schematic diagram of the internal spray quenching device in a non-working state.

[0026] Figure 3 This is a schematic diagram of the internal spray quenching device in operation within the quenching tank.

[0027] Figure 4 This is a schematic diagram of the internal spray quenching device in operation.

[0028] Figure 5This is a schematic diagram of a hydraulic cylinder used for lifting and lowering the internal spray nozzle in an internal spray quenching device.

[0029] Figure 6 This is a schematic diagram of the lifting steel cable used for raising and lowering the internal spray nozzle in the internal spray quenching device. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] A flexible internal spray quenching device for semi-enclosed cylindrical cavity shell parts, such as Figure 1 As shown, the system includes a base 01, a quenching tank 02, internal spray nozzles 03, internal spray circulation pipes 04, external spray nozzles 05, external spray circulation pipes 06, a flow control valve 07, a flow meter 08, and a supporting control system. The base 01 has an inlet 09, one end of which is connected to the independent inlet pipes of each internal spray nozzle 03, and the other end is connected to the internal spray circulation pipes 04. Specifically, the front end of the inlet 09 has independent pipes connected to the same number of internal spray nozzles 03, and is equipped with independent flow control valves and flow meters for adjusting and controlling the flow rate. The internal spray nozzles 03 are connected to the inlet 09 in the base 01 via supporting components, and are used to spray cooling medium inside the cylindrical cavity shell. Figure 2 , Figure 4 As shown, the number and layout of the internal spray nozzles 03 need to be designed according to the specific structural characteristics of the cylindrical cavity shell, and are usually in multiple rows. For complex cylindrical cavity shells with asymmetrical, non-uniform wall thickness, or local wall thickness differences, the internal spray nozzles 03 can flexibly adjust parameters such as longitudinal height, spray angle, and spray time according to local structural differences. In this case, they are arranged in multiple rows in a staggered manner to achieve uniform cooling of the inner circumference of the semi-enclosed cylindrical cavity shell. The internal spray circulation pipeline 04 is a pipeline system that transports the cooling medium to the internal spray nozzles 03. Each internal spray nozzle 03 has its own water inlet pipeline, and the flow rate can be controlled by a regulating valve.

[0032] like Figure 5 , Figure 6 As shown, each internal spray nozzle 03 is hinged to a lifting steel cable 12, and each lifting steel cable 12 is driven to rise and fall by a separate hydraulic cylinder 11. By extending or retracting the hydraulic cylinder 11 by a specific dimension, the lifting steel cable 12 slides between two sets of pulleys, causing the internal spray nozzle 03 to be precisely positioned at a specific angle to adapt to the longitudinal height and spray angle required by the inner wall of the workpiece.

[0033] like Figure 2As shown, in the non-operating state, the internal spray quenching device has its internal spray nozzle 03 in a retracted state, and its maximum size is smaller than the maximum closing size at both ends of the constricted cylindrical cavity shell. This design ensures that the device can easily enter and exit the constricted cylindrical cavity shell, without being limited by the closing size. Figure 3 , Figure 4 As shown, in the working state, the internal spray nozzle 03 of the internal spray quenching device is in the extended state. At this time, its maximum size is smaller than the minimum size of the inner cavity of the constricted cylindrical shell. The purpose of this design is to ensure that the device can smoothly enter the inner cavity of the constricted cylindrical shell and uniformly cool the entire inner cavity. This internal spray quenching device can spray cool the circumference of the inner wall of the variable cross-section semi-enclosed constricted cylindrical shell. In conjunction with the spiral external spray nozzles arranged circumferentially inside the quenching tank, it sprays cools the circumferential surface of the outer wall of the cylindrical shell, further improving the cooling uniformity of the cylindrical shell and controlling quenching deformation.

[0034] like Figure 1 As shown, the external spray nozzle 05 is fixed by an internal support component of the quenching tank 02. The water inlet end is connected to the external spray nozzle 05 of the quenching tank 02, and is used to spray cooling medium onto the outside of the cylindrical cavity. The number and layout of the external spray nozzles 05 need to be designed according to the specific structural characteristics of the cylindrical cavity shell and in coordination with the distribution of the internal spray nozzles 03. They are usually arranged in multiple rows of spirals. The external spray circulation pipeline 06 is a pipeline system that transports the cooling medium to the external spray nozzles 05, and the flow rate can be controlled by a regulating valve.

[0035] like Figure 1 , Figure 3 As shown, the flow control valve 07 is used to regulate the flow rate of the cooling medium in the nozzle. Each circulation pipeline is equipped with an independent flow control valve 07, which can be precisely adjusted as needed. The flow meter 08 is used to measure the actual flow rate of the nozzle. Each circulation pipeline has a flow meter 08 installed at the front end of the flow control valve 07, which can monitor the flow rate of the cooling medium in real time. The flow control valve 07 and the flow meter 08 are connected to the control system to achieve closed-loop control of the actual flow rate. Based on the difference between the set flow rate and the measured flow rate, the control system can automatically adjust the opening of the flow control valve, thereby precisely controlling the flow rate of the quenching medium. At the same time, the control system can also maintain the uniformity and stability of the water column, achieving fine control of the quenching process to ensure the quenching effect and uniformity.

[0036] The spray angle of the internal spray nozzle 03 is adjustable within the longitudinal range of 15° to 150°; the adjustable medium flow rate of the internal spray nozzle 03 is 1 to 200 L / min; the adjustable medium pressure of the internal spray nozzle 03 is 0.05 to 0.8 MPa; the flow rate, pressure, angle, and time of the quenching medium sprayed by the internal spray nozzle can all be independently adjusted; the quenching tank 02 is equipped with a temperature control instrument, and the temperature control accuracy of the quenching medium is ≤ ±2℃. The parameters such as the flow rate, pressure, angle, and time of the quenching medium sprayed by the internal spray quenching device are obtained through simulation optimization based on the structural characteristics of the specific constricted cylindrical cavity shell, the continuous cooling transformation characteristics of the material, and the properties of the quenching medium, in conjunction with the external wall spray quenching. This ensures precise control of the quenching process, achieving the best quenching effect and uniformity.

[0037] In addition to the main components mentioned above, the internal spray quenching device also includes auxiliary components such as a cooling medium storage device, pipe connections, and supports, as well as related sensors, monitoring systems, and operating interfaces. The specific configuration and composition need to be designed and installed according to actual needs to ensure the stable operation and safety performance of the device. These monitoring systems can also monitor various parameters of the quenching process in real time and provide corresponding control and adjustment functions to achieve precise control and monitoring of the quenching process, ensuring product quality and consistency.

[0038] All nozzles are connected to circulation pipelines equipped with independent flow control valves (07) and flow meters (08), which are connected to the control system to achieve real-time monitoring and adjustment of the set and measured flow rates, thereby precisely controlling the actual flow rate of the quenching medium. The longitudinal height, spray angle, and spray time of each nozzle can be automatically and flexibly adjusted via the control panel, which is primarily used to operate the control system. This invention, by adjusting parameters such as the quenching medium flow rate, pressure, angle, and time, and coordinating internal and external spray quenching, can meet the requirement of uniform cooling for cylindrical cavity shells with different materials and structural characteristics. It effectively solves problems such as the small opening diameter of narrow-mouth cylindrical cavity shells, the inability of existing internal spray quenching devices to enter, asynchronous quenching, large quenching deformation, and uneven hardness distribution. This internal spray quenching device features a compact structure, convenient operation, and strong adaptability, resulting in significant economic benefits and making it suitable for widespread application.

[0039] Example 1:

[0040] like Figure 1The diagram shows a semi-enclosed cylindrical cavity shell in a quenching tank in a non-working state. The semi-enclosed cylindrical cavity shell has an outer diameter of 3500mm, a length of 8500mm, and a wall thickness of 1.1-16mm (60mm for local bosses). The outer (inner) diameter of the upper end is 3500mm (600mm), and the outer (inner) diameter of the lower end is 3500mm (1800mm). It is formed from medium-carbon low-alloy high-strength steel, and its chemical composition (mass percentage) is: 0.3% C, 0.87% Si, 1.48% Mn, 1.24% Cr, 0.51% Mo, 0.12% V, 0.15% Ni, 0.001% S, 0.003% P, with the remainder being Fe.

[0041] A flexible internal spray quenching device is used for quenching semi-enclosed cylindrical shell parts. The cooling medium is delivered to the internal spray nozzle 03 through the water inlet system to cool the cylindrical shell parts. The cooling medium used here is 10% PAG quenching liquid, but quenching oil, water and other quenching media can also be used.

[0042] The number and layout of the internal spray nozzles 03 are designed according to the specific structural characteristics of the cylindrical cavity shell. The external wall spray quenching device is designed with symmetrically and evenly distributed nozzles. Because this embodiment is a complex cylindrical cavity shell with non-uniform wall thickness and local wall thickness differences, the internal spray quenching device nozzles are arranged in multiple staggered rows, such as... Figure 2 and Figure 4 As shown. Among them, the nozzle of the internal spray quenching device can be flexibly adjusted according to the needs of parameters such as longitudinal height, spray angle and spray time, so as to achieve uniform cooling of the inner circumference of the semi-enclosed cylindrical cavity shell.

[0043] Each internal spray nozzle 03 has its own water inlet pipe, and the flow rate can be controlled by a regulating valve to achieve precise flow regulation. Each water inlet pipe is equipped with an independent flow control valve 07 and a flow meter 08, which can precisely regulate the flow rate. By monitoring the flow rate of the cooling medium in real time, the flow rate of the quenching medium can be precisely controlled.

[0044] Flow control valve 07 and flow meter 08 are connected to the control system to achieve closed-loop control of the actual flow rate. The control system automatically adjusts the opening of the flow control valve based on the difference between the set flow rate and the measured flow rate, thereby precisely controlling the flow rate of the quenching medium. Simultaneously, the control system can maintain the uniformity and stability of the water column, achieving fine control of the quenching process to ensure quenching effect and uniformity.

[0045] In the non-working state, the internal spray nozzle 03 of the internal spray quenching device is in a retracted state, with a maximum size of 1650mm, smaller than the lower end closing size of the constricted cylindrical cavity shell, allowing it to easily enter and exit the constricted cylindrical cavity shell. In the working state, the internal spray nozzle 03 of the internal spray quenching device is in an extended state, with a maximum size of 2700mm, smaller than the minimum size of the boss inside the constricted cylindrical cavity shell, allowing it to smoothly open and fit against the inner cavity of the constricted cylindrical cavity shell, and uniformly cool the entire inner cavity.

[0046] The semi-enclosed cylindrical shell, heated to the quenching temperature and held at that temperature, is removed from the quenching furnace with the larger end facing down. The quenching tank cover is opened, and the semi-enclosed cylindrical shell descends into the tank, positioning itself directly above the internal spray quenching device. The control system automatically adjusts the angle, simultaneously spraying and quenching it from both inside and outside. The nozzle's spray angle can be adjusted within the range of 15° to 150°. Specifically, for wall thicknesses of 1–5 mm, the medium flow rate of the internal spray nozzle is 1–50 L / min, and the medium pressure is 0.05–0.8 MPa; for wall thicknesses of 5–10 mm, the medium flow rate is 30–100 L / min, and the medium pressure is 0.05–0.8 MPa; for wall thicknesses of 10–16 mm, the medium flow rate is 70–150 L / min, and the medium pressure is 0.05–0.8 MPa; and for a localized wall thickness of 60 mm, the medium flow rate is 100–200 L / min, and the medium pressure is 0.05–0.8 MPa. The flow rate, pressure, angle, and time of the quenching medium sprayed by the nozzle can all be independently adjusted. The parameters of the internal spray quenching device, such as the flow rate, pressure, angle, and time of the sprayed quenching medium, were obtained through simulation optimization based on the structural characteristics of the constricted cylindrical cavity shell, the continuous cooling transformation characteristics of the material, and the properties of the quenching medium, in conjunction with the external wall spray quenching. This ensures precise control of the quenching process, achieving optimal quenching effect and uniformity. The quenching tank 02 is equipped with a temperature control instrument, which can precisely control the temperature of the quenching medium, with a temperature range of 18~40℃ and a tolerance of ±2℃.

[0047] By using the internal spray quenching device of the present invention to quench the semi-retractable cylindrical cavity shell part of this embodiment, the test results show that the diameter deviation of the envelope circle is <1.5‰, the straightness deformation is ≤1mm / m, the performance dispersion is ≤4‰, and the small deformation after quenching only requires a small amount of machining to meet the assembly accuracy requirements, and the performance is uniform and stable.

[0048] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A flexible internal spray quenching device for semi-enclosed cylindrical cavity shell parts, characterized in that, The system includes a base, a quenching tank, internal spray nozzles, an internal spray circulation pipeline, and a control system. The base has a water inlet inside, one end of which is connected to an independent water inlet pipeline for each internal spray nozzle, and the other end is connected to the internal spray circulation pipeline. The internal spray nozzles are connected to the water inlet in the base through a support component and are used to spray cooling medium inside the cylindrical cavity shell. The internal spray circulation pipeline is a piping system that transports the cooling medium to the internal spray nozzles. Each internal spray nozzle has its own water inlet pipeline, and the flow rate is controlled by a regulating valve. The number and layout of the internal spray nozzles are set according to the specific structure of the cavity shell. They are usually distributed in multiple rows around the inner wall of the semi-enclosed cylindrical cavity shell with variable cross-section. In the non-working state, the internal spray nozzles are in a retracted state, and their maximum size is smaller than the maximum closing size at both ends of the cylindrical cavity shell. In the working state, the internal spray nozzles are in an extended state, and their maximum size is smaller than the minimum size of the inner cavity of the cylindrical cavity shell. They are used to uniformly spray and cool the inner wall of the semi-enclosed cylindrical cavity shell with variable cross-section. Each of the internal spray nozzles is hinged to a lifting steel cable, and each lifting steel cable is driven to rise and fall by a separate hydraulic cylinder. This hydraulic cylinder moves the lifting steel cable, thereby precisely controlling the longitudinal height of the internal spray nozzle to adapt to the specific longitudinal height and spray angle required by the inner wall of the workpiece.

2. The flexible internal spray quenching device for semi-enclosed cylindrical cavity shell parts according to claim 1, characterized in that, The spray angle of the internal spray nozzle is adjustable within the range of 15° to 150°; The adjustable medium flow rate of the internal spray nozzle is 1~200L / min; the adjustable medium pressure of the internal spray nozzle is 0.05~0.8MPa.

3. The flexible internal spray quenching device for a semi-enclosed cylindrical cavity shell according to claim 1, characterized in that, It also includes an external spray nozzle, which is spirally arranged around the inner wall of the quenching tank and is used to spray cooling medium on the outer wall circumferential surface of the cylindrical cavity to cool it.

4. The flexible internal spray quenching device for a semi-enclosed cylindrical cavity shell according to claim 1, characterized in that, It also includes flow control valves for adjusting the flow rate of the nozzle cooling medium, with an independent flow control valve installed on each circulation line for precise adjustment as needed.

5. The flexible internal spray quenching device for a semi-enclosed cylindrical cavity shell according to claim 1, characterized in that, It also includes a flow meter for measuring the actual flow rate of the nozzle. A flow meter is installed at the front end of each circulation pipeline where a flow control valve is located, for real-time monitoring of the flow rate of the cooling medium.

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