A closed cavity type casing welding heat treatment equipment for gas turbine and method thereof

Abstract

The application discloses a kind of closed cavity type casing welding heat treatment equipment for gas turbine and method thereof, it is related to heat treatment equipment technical field, including heat treatment furnace body and conveying trolley, conveying trolley is slidably arranged in the rail below heat treatment furnace body;It further includes the moving unit fixed in the outer wall of heat treatment furnace, the end of heat treatment furnace body away from its furnace door is slidably inserted with material receiving cross bar, it is used to be equipped with for the closed cavity type casing in heat treatment furnace body, locking unit one is arranged between moving unit and material receiving cross bar;The application can drive closed cavity type casing to be suspended in heat treatment furnace by the material receiving cross bar slidably inserted into heat treatment furnace body, so that each part of workpiece can be evenly heated, effectively avoid the problem that workpiece bottom is attached to carrier and leads to uneven heating, local stress concentration, can more fully release welding residual stress inside closed cavity, improve heat treatment uniformity and machining precision.

Description

Technical Field

[0001] This invention relates to the field of heat treatment equipment technology, specifically to a heat treatment equipment and method for welding enclosed cavity casings for gas turbines. Background Technology

[0002] Gas turbine enclosed casings are core load-bearing and aerodynamic components in the aerospace and energy sectors. They are typically welded from special materials such as nickel-based heat-resistant alloys and high-strength heat-resistant steel, and their enclosed structure, uneven wall thickness, and stringent dimensional accuracy requirements result in significant residual welding stresses after welding. If these stresses are not eliminated through specialized heat treatment processes, they can easily lead to component warping, weld cracking, and dimensional deviations, severely impacting the overall operational stability and service life of the gas turbine. Therefore, post-weld heat treatment is a crucial step in the manufacturing of enclosed casings.

[0003] In the prior art, for example, patent CN118600184A discloses a heat treatment device for cast steel parts of gas turbine casing components. This device achieves closed heat treatment of casing-type components through a heating box, a sealing door, and a support assembly. It can meet the basic heating and insulation requirements of conventional casings and effectively improve the sealing performance and basic processing efficiency of the heat treatment process. However, this equipment relies solely on the bottom support structure to support the workpiece, which is poorly adapted to the hollow closed structure characteristics of enclosed casings. The workpiece is placed in close contact with the support carrier throughout the process, and uneven heating and local stress concentration are likely to occur at the bottom under the high temperature environment inside the furnace. It cannot achieve suspended heat treatment of the workpiece, and it is difficult to completely release the residual stress inside the closed cavity. The uniformity of heat treatment and processing accuracy are difficult to guarantee.

[0004] Meanwhile, for example, patent CN107378366B discloses a welding fixture for gas turbine casings. It uses a support shaft and adjustable limiting parts to achieve the insertion, fixing, and positioning of casing workpieces, solving the problems of unstable positioning and easy workpiece displacement of traditional fixtures. It is suitable for the clamping and processing requirements of annular and hollow casings. However, this fixture only has static clamping and positioning functions and cannot adapt to the dynamic processing requirements in the heat treatment furnace. After the workpiece is clamped, it cannot be raised and lowered for fine adjustment in the furnace, resulting in poor overall heating consistency. Moreover, the fixture and the heat treatment furnace body are separate structures without dedicated locking and docking and heat insulation protection structures. The operation of workpieces entering and leaving the furnace is cumbersome, with low automation. It cannot achieve continuous and stable heat treatment of multiple workpieces, resulting in low processing efficiency and difficulty in adapting to the high-precision, batch welding heat treatment production requirements of enclosed cavity casings. Summary of the Invention

[0005] The purpose of this invention is to provide a welding heat treatment device and method for enclosed cavity casings of gas turbines, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a heat treatment equipment for welding enclosed cavity casings for gas turbines, comprising a heat treatment furnace body and a conveying trolley, wherein the conveying trolley is slidably disposed on a rail below the heat treatment furnace body; further comprising a moving unit fixed to the outer wall of the heat treatment furnace, wherein a receiving crossbar is slidably inserted into one end of the heat treatment furnace body away from its furnace door, which is used to pass through the enclosed cavity casing inside the heat treatment furnace body, wherein a locking unit one is provided between the moving unit and the receiving crossbar; and a locking unit two fixed inside the receiving crossbar, wherein two sets of locking units two are symmetrically distributed, and a docking unit that locks and engages with the locking unit two is slidably inserted into the top of the heat treatment furnace body.

[0007] Preferably, the locking unit includes an electric push rod, a connecting block is fixed to the telescopic end of the electric push rod, an insert plate is fixed to one end of the connecting block, a slot adapted to the insert plate is provided at one end of the receiving crossbar, a connecting plate is installed on the outer side of the electric push rod, the output end of the moving unit is fixedly connected to the connecting plate, an electric push rod is fixed to the top of the insert plate, a locking plate is fixed to the telescopic end of the electric push rod, and a locking slot for the locking plate to pass through is provided on the insert plate.

[0008] Preferably, the second locking unit includes a rotating shaft rotatably connected inside the receiving crossbar, with threaded rods fixed at both ends of the rotating shaft, a moving block threadedly connected to the outer side of the threaded rod, a locking pin fixed on one side of the moving block, and a dual-axis servo motor installed in the middle of the rotating shaft.

[0009] Preferably, the docking unit includes a vertical rod slidably disposed on the top of the heat treatment furnace body, a locking block fixed at the bottom end of the vertical rod, a pin hole provided in the locking block, the pin hole being adapted to the locking pin, a connecting plate two fixed at the top end of the vertical rod, a lifting component installed on the connecting plate two, and an avoidance hole provided on the receiving crossbar that is slidably connected to the locking block.

[0010] Preferably, the moving unit includes a crossbeam fixedly connected to the outer wall of the heat treatment furnace body. The crossbeam and the receiving crossbar are arranged parallel to each other. A linear module is installed on the crossbeam. A connecting plate three is fixedly connected to the output end of the linear module. The connecting plate three and the connecting plate one are fixedly connected.

[0011] Preferably, the inner wall of the receiving crossbar is provided with a heat insulation layer to isolate the high temperature inside the heat treatment furnace.

[0012] Preferably, the lifting component includes an L-shaped plate, which is fixed to the top of the heat treatment furnace body. A hydraulic cylinder is installed on one side of the L-shaped plate, and the telescopic end of the hydraulic cylinder is fixedly connected to the second connecting plate. A slider is fixed to the outer side of the second connecting plate, and a guide rail adapted to the slider is fixed on the L-shaped plate.

[0013] Preferably, the receiving crossbar has grooves, and multiple grooves are evenly distributed in an array.

[0014] Preferably, a small furnace door is provided on one outer wall of the heat treatment furnace body and above the receiving crossbar. The small furnace door is used to close the slide rail on the heat treatment furnace body that allows the receiving crossbar to slide.

[0015] A method for welding heat treatment of enclosed cavity casings for gas turbines, using the aforementioned welding heat treatment equipment for enclosed cavity casings for gas turbines, includes the following steps: S1: Move the closed-cavity casing to be heat-treated on the conveyor trolley into the heat treatment furnace body, so that the conveyor trolley seals the bottom of the heat treatment furnace body. Then, the moving unit drives the receiving crossbar to move into the heat treatment furnace body and inserts the closed-cavity casings fixed on the conveyor trolley one by one onto the receiving crossbar. S2: Control the lifting component to work, drive the locking block to insert into the clearance hole on the receiving crossbar, then control the dual-axis servo motor to work, drive the rotating shaft to rotate, and then drive the threaded rods at both ends to rotate, so that the two moving blocks move away from each other, and finally let the locking pin insert into the pin hole of the locking block, and complete the locking and fixing of the docking unit and the second locking unit. S3: Then, by locking the receiving crossbar and moving unit, the small furnace door and the furnace door are closed, and the heat treatment operation can be carried out on the closed cavity type casing. At this time, the multiple closed cavity type casings on the receiving crossbar can move up and down in the furnace body under the drive of the lifting component, so that the closed cavity type casing can be suspended in the air and no longer contact the conveyor trolley. S4: After heat treatment, the lifting component moves the enclosed cavity type casing down to the corresponding fixed position on the conveyor trolley for fixing. Then, the furnace door and the small furnace door are opened, and the locking unit one locks the receiving crossbar first. Then, the locking unit two is released, and the receiving crossbar is moved out by the moving unit. The processed enclosed cavity type casings can then be unloaded one by one.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention features a sliding crossbar that can be inserted into the heat treatment furnace body to support multiple enclosed cavity casings. Combined with a top-mounted lifting docking unit and locking unit, the crossbar can be locked to the docking unit during heat treatment. Then, the connection between the moving unit and the crossbar is released, allowing the entire enclosed cavity casing to be suspended inside the heat treatment furnace. This ensures uniform heating of all parts of the workpiece, effectively preventing uneven heating and localized stress concentration caused by the workpiece's bottom contact with the carrier. It also allows for more thorough release of residual welding stress inside the enclosed cavity, improving heat treatment uniformity and processing accuracy. The present invention can also drive the receiving crossbar to move up and down through the lifting component, so that the closed cavity type casing can switch positions by itself during the heat treatment process, ensuring that the casing can receive heat in the furnace evenly, further improving the overall heating consistency, avoiding deformation problems caused by excessive local temperature difference, and better ensuring the heat treatment processing quality of the closed cavity type casing. This invention enables rapid switching between the receiving crossbar and the moving unit by switching between locking unit one and locking unit two respectively with the receiving crossbar. This facilitates the overall transfer of the workpiece into the furnace after loading, without affecting the suspension and lifting operation of the receiving crossbar during heat treatment. It eliminates the need for manual disassembly and assembly of tooling, and enables continuous and stable heat treatment of multiple workpieces, adapting to the high-precision, batch production needs of closed-cavity casing welding heat treatment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a schematic diagram of the structure of the heat treatment furnace body of the present invention; Figure 4 This is a schematic diagram of the structure of the locking unit one of the present invention; Figure 5 This is a schematic diagram of the docking unit of the present invention; Figure 6 This is a schematic diagram of the second locking unit of the present invention; Figure 7 This is a schematic diagram of the material receiving crossbar of the present invention; Figure 8 for Figure 5 Enlarged schematic diagram of the structure of region A in the middle.

[0018] In the diagram: 1. Heat treatment furnace body; 2. Conveying trolley; 3. Moving unit; 4. Receiving crossbar; 5. Locking unit one; 6. Locking unit two; 7. Docking unit; 8. Electric push rod one; 9. Connecting block; 10. Insert plate; 11. Slot; 12. Connecting plate one; 13. Electric push rod two; 14. Locking plate; 15. Locking slot; 16. Rotating shaft; 17. Threaded rod; 18. Moving block; 19. Locking pin; 20. Dual-axis servo motor; 21. Vertical rod; 22. Locking block; 23. Pin hole; 24. Connecting plate two; 25. Lifting component; 26. Clearance hole; 27. Horizontal frame; 28. Linear module; 29. ​​Connecting plate three; 30. L-shaped plate; 31. Hydraulic cylinder; 32. Slider; 33. Guide rail; 34. Groove; 35. Small furnace door. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: Please refer to Figure 1 - Figure 8 The diagram shows a heat treatment equipment for welding enclosed-cavity casings of gas turbines, including a heat treatment furnace body 1 and a conveying trolley 2. The conveying trolley 2 is slidably mounted on a rail below the heat treatment furnace body 1. It also includes a moving unit 3 fixed to the outer wall of the heat treatment furnace. A receiving crossbar 4 is slidably inserted into one end of the heat treatment furnace body 1 away from its furnace door. It is used to pass through the enclosed-cavity casing inside the heat treatment furnace body 1. A locking unit 5 is provided between the moving unit 3 and the receiving crossbar 4. A second locking unit 6 is fixed inside the receiving crossbar 4. Two sets of locking units 6 are symmetrically distributed. A docking unit 7 that is slidably inserted into the top of the heat treatment furnace body 1 and locked in conjunction with the second locking unit 6 is locked in place.

[0021] The inner wall of the receiving crossbar 4 is provided with a heat insulation layer to isolate the high temperature inside the heat treatment furnace 1, reduce the damage to the transmission components of the locking unit 6 inside the receiving crossbar 4 caused by the high temperature inside the furnace, and ensure the working stability of the locking structure in the high temperature environment. Moreover, the receiving crossbar 4 is made of heat-resistant alloy material, which can withstand the high temperature environment inside the furnace for a long time. The receiving crossbar 4 is provided with grooves 34, and multiple grooves 34 are evenly distributed in an array. The grooves 34 can limit the closed cavity type casing after it is inserted, prevent the workpiece from sliding freely on the receiving crossbar 4, and improve the stability of the closed cavity type casing on the receiving crossbar 4.

[0022] In this solution, by setting a receiving crossbar 4 that can slide into the heat treatment furnace body 1, multiple sets of enclosed cavity type casings can be installed and supported. With the top liftable docking unit 7 and locking unit 6, the receiving crossbar 4 and docking unit 7 can be locked and fixed during heat treatment. Then, the connection between the moving unit 3 and the receiving crossbar 4 can be released, which can drive the entire enclosed cavity type casing to be suspended inside the heat treatment furnace. This allows all parts of the workpiece to be heated evenly, effectively avoiding the problem of uneven heating and local stress concentration caused by the bottom of the workpiece sticking to the carrier. It can also more fully release the welding residual stress inside the enclosed cavity, and improve the uniformity of heat treatment and processing accuracy.

[0023] It is worth noting that enclosed cavity casings are mostly cylindrical, and their hollow structure can be inserted into the receiving crossbar 4 to achieve suspended placement. This perfectly matches the insertion and bearing form of the receiving crossbar 4, eliminating the need for additional customized bearing fixtures. Cylindrical enclosed cavity casings of different sizes can be directly inserted and fixed, resulting in stronger equipment adaptability.

[0024] For further details, please refer to [link / reference]. Figure 2 and Figure 4 The locking unit 5 includes an electric push rod 8, a connecting block 9 is fixed to the telescopic end of the electric push rod 8, an insert plate 10 is fixed to one end of the connecting block 9, a slot 11 adapted to the insert plate 10 is opened at one end of the receiving crossbar 4, a connecting plate 12 is installed on the outside of the electric push rod 8, the output end of the moving unit 3 is fixedly connected to the connecting plate 12, an electric push rod 2 13 is fixed to the top of the insert plate 10, a locking plate 14 is fixed to the telescopic end of the electric push rod 2 13, and a locking slot 15 for the locking plate 14 to pass through is opened on the insert plate 10.

[0025] In this scheme, after the moving unit 3 drives the receiving crossbar 4 to complete the insertion operation, the electric push rod 13 drives the locking plate 14 to extend out of the locking slot 15, and then the electric push rod 8 retracts to allow the insert plate 10 to move out of the slot 11, thereby releasing the connection lock between the moving unit 3 and the receiving crossbar 4. This allows the retraction of the moving unit 3 to not affect the subsequent suspension and lifting operation of the receiving crossbar 4. When it is necessary to remove the receiving crossbar 4, the moving unit 3 drives the insert plate 10 to align with the slot 11 and insert it, and then extends the locking plate 14 to complete the locking, thereby driving the receiving crossbar 4 to move out as a whole. The operation is convenient and can achieve automatic docking and locking without manual intervention. In addition, the electric push rod 8 will drive the electric push rod 13 to retract to a position away from the receiving crossbar 4, so that the small furnace door 35 can be closed smoothly, preventing a large amount of heat from the furnace from the insertion port of the receiving crossbar 4, maintaining the stability of the heat treatment temperature in the furnace, and reducing energy loss.

[0026] It should be noted that the length of the through cavity through which the heat treatment furnace body 1 and the receiving crossbar 4 slide and intersect is greater than the width of the receiving crossbar 4. In this way, when the receiving crossbar 4 is completely inside the furnace body, the moving unit 3 and part of the locking unit 5 can still remain outside the furnace body, without occupying the space inside the furnace, and can also prevent the locking unit 5 from being damaged by long-term exposure to the high temperature environment.

[0027] For further details, please refer to [link / reference]. Figure 6 The locking unit 2 6 includes a rotating shaft 16 rotatably connected inside the receiving crossbar 4. Both ends of the rotating shaft 16 are fixed with threaded rods 17. The outer side of the threaded rods 17 is threaded with a moving block 18. A locking pin 19 is fixed on one side of the moving block 18. A dual-axis servo motor 20 is installed in the middle of the rotating shaft 16.

[0028] Among them, see Figure 5 and Figure 8 The docking unit 7 includes a vertical rod 21 that is slidably disposed on the top of the heat treatment furnace body 1. A locking block 22 is fixed at the bottom end of the vertical rod 21. A pin hole 23 is provided in the locking block 22. The pin hole 23 is adapted to the locking pin 19. A connecting plate 24 is fixed at the top end of the vertical rod 21. A lifting component 25 is installed on the connecting plate 24. An avoidance hole 26 is provided on the receiving crossbar 4 that is slidably connected to the locking block 22.

[0029] In this solution, the dual-axis servo motor 20 drives the rotating shaft 16 to rotate, which in turn drives the threaded rods 17 at both ends to rotate, thereby driving the two moving blocks 18 to move in opposite directions. When the locking block 22 is inserted into the clearance hole 26, the two moving blocks 18 move away from each other, which drives the locking pin 19 to be inserted into the pin hole 23 of the locking block 22, quickly completing the locking and fixing of the receiving crossbar 4 and the docking unit 7. The operation is synchronous and the response is rapid, and it can stably support the weight of the receiving crossbar 4 and multiple sets of housings.

[0030] It should be noted that the threads at both ends of the threaded rod 17 turn in opposite directions. Therefore, when the rotating shaft 16 rotates, the two moving blocks 18 can move closer or further away from each other synchronously, without any misalignment, ensuring the synchronicity and stability of the locking action. In addition, the threaded rod 17 itself has a self-locking capability. When the dual-axis servo motor 20 stops working, the moving blocks 18 will not move on their own, and can maintain a stable locking state to avoid the risk of loosening. At the same time, the dual-axis servo motor 20 used is model DS-25RS370. In actual use, the appropriate power of the dual-axis servo motor 20 can be selected according to the load-bearing weight of the receiving crossbar 4.

[0031] For further details, please refer to [link / reference]. Figure 2The moving unit 3 includes a cross frame 27 fixedly connected to the outer wall of the heat treatment furnace body 1. The cross frame 27 and the receiving crossbar 4 are arranged parallel to each other. A linear module 28 is installed on the cross frame 27. A connecting plate 3 29 is fixedly connected to the output end of the linear module 28. The connecting plate 3 29 and the connecting plate 12 are fixedly connected.

[0032] It should be noted that the linear module 28 can drive the connecting plate 29 to move smoothly, thereby stably driving the receiving crossbar 4 to extend into or out of the heat treatment furnace body 1. The movement accuracy is high, which makes it easy for the receiving crossbar 4 to be aligned and enter the furnace body, avoiding jamming and misalignment.

[0033] It should also be noted that the linear module 28 adopts a ball screw type linear transmission structure, which ensures stable transmission and high precision during operation. It can accurately control the movement position of the receiving crossbar 4 to meet the positioning requirements of automatic feeding. At the same time, the ball screw structure has a strong load-bearing capacity and can stably support the weight of the receiving crossbar 4 and multiple sets of housings, ensuring stable operation during the loading and unloading process.

[0034] Additionally, see Figure 3 A small furnace door 35 is provided on one side of the outer wall of the heat treatment furnace body 1, near the upper part of the receiving crossbar 4. The small furnace door 35 is used to close the slide rail on the heat treatment furnace body 1 for the receiving crossbar 4 to slide, thereby reducing the heat loss from the furnace during the heat treatment process, maintaining the furnace temperature stability, and reducing energy consumption. The small furnace door 35 can be closed after the receiving crossbar 4 is fully inserted into the furnace body, leaving only the external locking unit 5 and the moving unit 3 outside the furnace, without affecting the normal operation of the heat treatment.

[0035] It should be noted that both the small furnace door 35 and the furnace body door are equipped with high-temperature resistant seals. These seals can fill gaps, further improving the sealing performance of the furnace body and reducing heat loss. In addition, the small furnace door 35 adopts an independent opening and closing design, which can be opened separately during the loading and unloading process without fully opening the large-sized main furnace door. Furthermore, the drive devices and other structures required for opening both are the same, and the opening and closing drive devices are existing technologies, which will not be described in detail here.

[0036] A method for welding heat treatment of enclosed cavity casings for gas turbines, using the aforementioned welding heat treatment equipment for enclosed cavity casings for gas turbines, includes the following steps: S1: Move the closed cavity type casing to be heat-treated on the conveyor trolley 2 into the heat treatment furnace body 1, so that the conveyor trolley 2 seals the bottom of the heat treatment furnace body 1. Then, the moving unit 3 drives the receiving crossbar 4 to move into the heat treatment furnace body 1 and inserts the closed cavity type casing fixed on the conveyor trolley 2 one by one onto the receiving crossbar 4. S2: Control the lifting component 25 to work, drive the locking block 22 to insert into the clearance hole 26 on the receiving crossbar 4, then control the dual-axis servo motor 20 to work, drive the rotating shaft 16 to rotate, and then drive the threaded rods 17 at both ends to rotate, so that the two moving blocks 18 move away from each other, and finally let the locking pin 19 insert into the pin hole 23 of the locking block 22, and complete the locking and fixing of the docking unit 7 and the locking unit 2 6; S3: Then, by locking unit 5, the locking of receiving crossbar 4 and moving unit 3 is released, and the small furnace door 35 and furnace door are closed. Then, heat treatment can be performed on the closed cavity type casing. At this time, multiple closed cavity type casings on receiving crossbar 4 can move up and down in the furnace body under the drive of lifting component 25, so that the closed cavity type casing can be suspended and no longer contact the conveying trolley 2. S4: After heat treatment, the lifting component 25 moves the closed cavity type casing down to the corresponding fixed position on the conveyor trolley 2 for fixing. Then, the furnace door and the small furnace door 35 are opened, and the locking unit 1 5 locks the receiving crossbar 4 first. Then, the locking state of the locking unit 2 6 is released, and the receiving crossbar 4 is moved out by the moving unit 3. The processed closed cavity type casings can be unloaded one by one.

[0037] Example 2: Refer to Figure 5 As shown, this embodiment further explains the first embodiment, the difference being that the heating method of the receiving crossbar 4 is optimized.

[0038] Specifically, the lifting component 25 includes an L-shaped plate 30, which is fixed to the top of the heat treatment furnace body 1. A hydraulic cylinder 31 is installed on one side of the L-shaped plate 30. The telescopic end of the hydraulic cylinder 31 is fixedly connected to the connecting plate 24. A slider 32 is fixed on the outside of the connecting plate 24. A guide rail 33 that matches the slider 32 is fixed on the L-shaped plate 30.

[0039] It should be noted that by setting up the lifting component 25, the hydraulic cylinder 31 drives the connecting plate 24 to move up and down smoothly in the vertical direction. With the guidance and limit of the slider 32 and the guide rail 33, it can avoid tilting and shaking during the lifting process, ensuring the stability of the receiving crossbar 4 and the enclosed chamber casing that it supports during the lifting process, so that the casing can switch the heating position evenly and further improve the heat treatment uniformity. It is worth noting that in traditional heat treatment, the workpiece is supported on the surface of the conveyor trolley 2 throughout the entire process, and the bottom is blocked and cannot come into contact with the hot air flow and heat radiation inside the furnace, resulting in a heat blind zone. After the lifting component 25 completes the locking and docking, it can drive the entire workpiece of the casing to be suspended and lifted off the surface of the conveyor trolley 2, so that the bottom, side wall and top of the workpiece are completely exposed to the constant temperature field inside the furnace. At the same time, through continuous and precise switching of lifting positions, the workpiece can be alternately placed in different temperature zones in the upper, middle and lower parts of the furnace, which can offset the inherent problems of temperature difference between the upper and lower parts and uneven distribution of hot air flow in the heat treatment furnace. This allows the closed inner cavity, weld seam and parts with different wall thicknesses of the closed cavity casing to absorb heat evenly, completely eliminating the defects of local stress concentration and uneven heating, and greatly improving the residual stress elimination effect and the heat treatment accuracy of the workpiece.

[0040] In this solution, hydraulic cylinder 31 is used for lifting, which can provide a large lifting force and stably bear the total weight of multiple enclosed chamber casings and receiving crossbars 4. The lifting process is precisely controlled and there will be no jamming or stalling. It is suitable for adjusting the position of the workpiece during the heat treatment process.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended technical solutions and their equivalents.

Claims

1. A heat treatment apparatus for welding enclosed cavity casings for gas turbines, comprising: The heat treatment furnace body (1) and the conveying trolley (2) are slidably arranged on the rails below the heat treatment furnace body (1); Its characteristic is that it further includes: A movable unit (3) is fixed to the outer wall of the heat treatment furnace. A receiving crossbar (4) is slidably inserted at one end of the heat treatment furnace body (1) away from its furnace door. This crossbar is used to pass through the enclosed cavity-like casing inside the heat treatment furnace body (1). A locking unit (5) is provided between the movable unit (3) and the receiving crossbar (4). The locking unit two (6) is fixed inside the receiving crossbar (4). Two sets of the locking unit two (6) are symmetrically distributed. The top of the heat treatment furnace body (1) is slidably inserted with a docking unit (7) that locks and engages with the locking unit two (6).

2. The heat treatment equipment for welding enclosed cavity casings for gas turbines according to claim 1, characterized in that: The locking unit 1 (5) includes an electric push rod 1 (8), the telescopic end of the electric push rod 1 (8) is fixed with a connecting block (9), one end of the connecting block (9) is fixed with a plug plate (10), one end of the receiving crossbar (4) is provided with a slot (11) adapted to the plug plate (10), the outer side of the electric push rod 1 (8) is installed with a connecting plate 1 (12), the output end of the moving unit (3) is fixedly connected to the connecting plate 1 (12), the top of the plug plate (10) is fixed with an electric push rod 2 (13), the telescopic end of the electric push rod 2 (13) is fixed with a locking plate (14), and the plug plate (10) is provided with a locking slot (15) for the locking plate (14) to pass through.

3. The heat treatment equipment for welding enclosed cavity casings for gas turbines according to claim 2, characterized in that: The second locking unit (6) includes a rotating shaft (16) rotatably connected inside the receiving crossbar (4). Both ends of the rotating shaft (16) are fixed with threaded rods (17). A moving block (18) is threadedly connected to the outer side of the threaded rod (17). A locking pin (19) is fixed on one side of the moving block (18). A dual-axis servo motor (20) is installed in the middle of the rotating shaft (16).

4. The heat treatment equipment for welding enclosed cavity casings for gas turbines according to claim 3, characterized in that: The docking unit (7) includes a vertical rod (21) slidably disposed on the top of the heat treatment furnace body (1). A locking block (22) is fixed at the bottom end of the vertical rod (21). A pin hole (23) is opened in the locking block (22). The pin hole (23) is adapted to the locking pin (19). A connecting plate (24) is fixed at the top end of the vertical rod (21). A lifting component (25) is installed on the connecting plate (24). An avoidance hole (26) is opened on the receiving crossbar (4) and is slidably connected to the locking block (22).

5. The heat treatment equipment for welding enclosed cavity casings for gas turbines according to claim 4, characterized in that: The moving unit (3) includes a cross frame (27) fixedly connected to the outer wall of the heat treatment furnace body (1). The cross frame (27) and the receiving cross bar (4) are arranged parallel to each other. A linear module (28) is installed on the cross frame (27). A connecting plate three (29) is fixed to the output end of the linear module (28). The connecting plate three (29) and the connecting plate one (12) are fixedly connected.

6. The heat treatment equipment for welding enclosed cavity casings for gas turbines according to claim 1, characterized in that: The inner wall of the receiving crossbar (4) is provided with a heat insulation layer to isolate the high temperature inside the heat treatment furnace (1).

7. The heat treatment equipment for welding enclosed cavity casings for gas turbines according to claim 5, characterized in that: The lifting component (25) includes an L-shaped plate (30), which is fixed to the top of the heat treatment furnace body (1). A hydraulic cylinder (31) is installed on one side of the L-shaped plate (30). The telescopic end of the hydraulic cylinder (31) is fixedly connected to the connecting plate two (24). A slider (32) is fixed on the outside of the connecting plate two (24). A guide rail (33) that matches the slider (32) is fixed on the L-shaped plate (30).

8. The heat treatment equipment for welding enclosed cavity casings for gas turbines according to claim 1, characterized in that: The receiving crossbar (4) has grooves (34) evenly distributed in multiple arrays.

9. The heat treatment equipment for welding enclosed cavity casings for gas turbines according to claim 1, characterized in that: A small furnace door (35) is provided on one side of the outer wall of the heat treatment furnace body (1) and above the receiving crossbar (4). The small furnace door (35) is used to close the slide rail on the heat treatment furnace body (1) for the receiving crossbar (4) to slide.

10. A method for welding heat treatment of enclosed cavity casings for gas turbines, using a welding heat treatment device for enclosed cavity casings for gas turbines as described in claim 1, characterized in that, Includes the following steps: S1: Move the closed cavity type casing to be heat-treated on the conveyor trolley (2) into the heat treatment furnace body (1), so that the conveyor trolley (2) seals the bottom of the heat treatment furnace body (1), and then the moving unit (3) drives the receiving crossbar (4) to extend into the heat treatment furnace body (1), and the closed cavity type casing fixed on the conveyor trolley (2) is inserted one by one onto the receiving crossbar (4); S2: Control the lifting component (25) to work, drive the locking block (22) to insert into the clearance hole (26) on the receiving crossbar (4), then control the dual-axis servo motor (20) to work, drive the rotating shaft (16) to rotate, and then drive the threaded rods (17) at both ends to rotate, so that the two moving blocks (18) move away from each other, and finally let the locking pin (19) be inserted into the pin hole (23) of the locking block (22) to complete the locking and fixing of the docking unit (7) and the second locking unit (6); S3: Then, by locking unit 1 (5), the locking of receiving crossbar (4) and moving unit (3) is released, and the small furnace door (35) and furnace door are closed. Then, heat treatment operation can be carried out on the closed cavity type casing. At this time, multiple closed cavity type casings on receiving crossbar (4) can move up and down in the furnace body under the drive of lifting component (25), so that the closed cavity type casing can be suspended and no longer contact the conveying trolley (2). S4: After heat treatment, the lifting component (25) moves the closed cavity type casing down to the corresponding fixed position on the conveyor trolley (2) for fixing. Then, the furnace door and the small furnace door (35) are opened, and the locking unit one (5) locks the receiving crossbar (4) first. Then, the locking state of the locking unit two (6) is released, and the receiving crossbar (4) is moved out by the moving unit (3). The processed closed cavity type casings can be unloaded one by one.

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