Heat treatment equipment and method for stainless steel investment casting

Abstract

The invention discloses heat treatment equipment and method for stainless steel investment casting, and relates to the technical field of investment casting. The heat treatment equipment for stainless steel investment casting comprises a conveyor arranged at the top of a bottom plate, the conveyor comprises a conveying belt, the top of the bottom plate is connected with a preheating cover through a lifting module, and the side wall of the preheating cover is fixedly connected with a connecting block. According to the heat treatment equipment and method for stainless steel investment casting, waste gas generated by casting can be collected, meanwhile, waste heat of the waste gas can be used for preheating a shell mold, the follow-up casting quality can be improved, the waste heat generated during casting can be recycled, and more energy conservation and environmental protection are achieved; during casting, external air can be prevented from entering the hollow cover, meanwhile, gas in the hollow cover and the shell mold can be conveniently exhausted, and the casting quality is guaranteed; and the bottom of the conveying belt is knocked and vibrated in a reciprocating mode, the shell mold can be vibrated in a reciprocating mode, and therefore the casting quality can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of investment casting, and specifically relates to a heat treatment device and method for investment casting of stainless steel. Background Art

[0002] The investment casting method is a precision casting process based on a polystyrene foam prototype. It realizes the cavity-free forming of complex components (such as stainless steel automotive parts) by replacing the vaporized foam with high-temperature molten metal. It is especially suitable for the forming of high-melting-point alloys such as stainless steel. Under the background of intelligent manufacturing, this process is deeply integrated with the intelligent casting island, relying on automated molding, robotic pouring, and on-line inspection systems to achieve efficient and continuous production.

[0003] However, in the current casting molding process, the shell mold is usually directly poured without preheating. The temperature difference between the inside and outside of the mold shell is significant (the outer layer is rapidly cooled / the internal high temperature remains), which will induce forming defects such as shrinkage cavities and thermal cracks. Moreover, during pouring, toxic waste gases such as styrene and CO and metal oxide particles generated by the vaporization of the foam plastic will cause VOCs pollution and carbon emissions. The waste heat generated during the pouring process (the waste gas temperature can reach 400 - 600 °C) will also be wasted, which is contrary to the energy conservation and emission reduction goals required by the intelligent casting island.

[0004] Therefore, a heat treatment device and method for investment casting of stainless steel are proposed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a heat treatment device and method for investment casting of stainless steel to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A heat treatment device for investment casting of stainless steel, including a conveyor arranged on the top of a bottom plate, and the conveyor includes a conveyor belt; The top of the bottom plate is connected with a preheating cover through a lifting module, and a connecting block is fixedly connected to the side wall of the preheating cover. A hollow cover is fixedly connected to the side wall of the connecting block, and an annular groove is opened on the inner side wall of the hollow cover; The top of the bottom plate is fixedly connected with a first support block, and a fixed cover is fixedly connected to the top of the first support block. A sliding plate is slidably connected inside the fixed cover, and a first moving module is arranged between the sliding plate and the bottom plate; A connecting pipe is fixedly connected between the hollow cover and the preheating cover, and a flexible pipe is fixedly connected between the preheating cover and the fixed cover. A first one-way valve is arranged inside the flexible pipe, and an air storage tank is fixedly connected to the top of the bottom plate. A gas collecting pipe is fixedly connected between the air storage tank and the fixed cover, and a second one-way valve is arranged inside the gas collecting pipe.

[0007] Preferably, it further includes a sealing plate inserted into the hollow cover, and a connecting frame is fixedly connected between the sealing plate and the bottom plate. A casting pipe is fixedly inserted at the top of the sealing plate. The upper end of the casting pipe is fixedly connected to a hopper, and the top of the hopper is rotatably connected to a cover plate through a rotating mechanism. An opening and closing mechanism is arranged on the side wall of the casting pipe, and a vibrating mechanism for vibrating the shell mold is arranged below the conveyor belt.

[0008] Preferably, the opening and closing mechanism includes a working cover fixedly inserted on the side wall of the casting pipe, and the working cover is communicated with the casting pipe. A partition plate is slidably connected in the working cover. The side wall of the working cover is connected to a connecting plate through a second moving module, and the connecting plate is fixed to the side wall of the partition plate.

[0009] Preferably, the rotating mechanism includes two symmetrically arranged L-shaped blocks fixedly connected to the side wall of the hopper. The side wall of the L-shaped block is rotatably connected to a rotating block through a rotating shaft. The rotating block is fixed to the side wall of the cover plate, and the rotation of the rotating shaft is driven by a driving mechanism.

[0010] Preferably, the driving mechanism includes a gear fixedly sleeved on the side wall of the rotating shaft. The side wall of the L-shaped block is connected to a rack through a first reset mechanism. The rack is meshed with the gear, and the movement of the rack is pushed by a first pushing mechanism.

[0011] Preferably, the first reset mechanism includes two symmetrically arranged second support blocks fixedly connected to the side wall of the L-shaped block. Two symmetrically arranged guide rods are fixedly connected to the opposite side walls of the two second support blocks. A slider is sleeved on the side wall of each guide rod. The slider is fixed to the side wall of the rack, and a first spring is sleeved on the side wall of each guide rod; The first pushing mechanism includes an L-shaped plate fixedly connected to the side wall of the rack. The lower end of the L-shaped plate is fixedly connected to an inclined plate, and the other end of the inclined plate is fixedly connected to a flat plate.

[0012] Preferably, the vibrating mechanism includes a moving plate. A plurality of rubber rods arranged in an array are fixedly connected to the top of the moving plate. The moving plate is connected to the top of the bottom plate through a second reset mechanism, and the movement of the moving plate is pushed by a second pushing mechanism.

[0013] Preferably, the second reset mechanism includes a fixing plate fixedly connected to the top of the bottom plate. An installation plate is fixedly connected to the side wall of the fixing plate. Two symmetrically arranged T-shaped guide rods are inserted at the bottom of the installation plate. The upper ends of the T-shaped guide rods are fixed to the bottom of the moving plate, and a second spring is sleeved on the side wall of each T-shaped guide rod.

[0014] Preferably, the second pushing mechanism includes a fixing pin fixedly connected to the bottom of the moving plate, and a connecting rod fixedly connected to the side wall of the sliding plate. The other end of the connecting rod penetrates through the side wall of the fixing cover, and a plurality of triangular blocks arranged in an array are fixedly connected to the top of the connecting rod.

[0015] A heat treatment method for investment casting of stainless steel, using the above-mentioned heat treatment equipment for investment casting of stainless steel, includes the following steps: S1: When casting, place the shell mold on the conveyor belt for transportation. When it is transported below the preheating cover and the hollow cover, drive the preheating cover to move downward through the lifting module. At the same time, drive the hollow cover to move downward through the connecting block, so that the hollow cover can cover the preheated shell mold and there is a gap between the inner wall of the hollow cover and the shell mold, and the preheating cover can cover the un-preheated shell mold. S2: Then, pour the molten metal into the hopper. After the molten metal is poured into the hopper, it will enter the casting pipe and be above the partition plate. Then, drive the connecting plate to move through the second moving module, and drive the partition plate to move away from the working cover, thereby opening the casting pipe. At this time, the molten metal in the hopper can enter the shell mold through the casting pipe. And when the connecting plate moves, it can slide along the bottom of the inclined plate to the bottom of the flat plate, so that the rack can be pushed upward by the L-shaped plate. At the same time, the first spring is compressed. When the rack moves upward, it can push the gear to rotate counterclockwise, and drive the cover plate to rotate and close through the rotating shaft and the rotating block, thereby sealing the top of the hopper, which can prevent external air from entering the hollow cover, ensure the casting quality and avoid waste of heat. S3: Then, the molten metal enters the shell mold through the casting pipe. At the same time, drive the sliding plate to move away from the fixing cover through the first moving module. The first one-way valve opens and the second one-way valve closes. At this time, the hot gas generated during casting can enter the hollow cover through the gap and the annular groove. At this time, the outer wall of the shell mold can be heated, which can improve the casting quality. Then, it enters the preheating cover through the connecting pipe. At this time, the un-preheated shell mold can be preheated. This can not only improve the quality of subsequent casting, but also recycle and reuse the waste heat during casting, which is more energy-saving and environmentally friendly. The preheated waste gas can enter the fixing cover through the hose for temporary storage. S4: When the sliding plate moves, it can drive the triangular block to move through the connecting rod. When the triangular block abuts against the lower end of the fixing pin, it can push the moving plate and the rubber rod upward. At the same time, the second spring is compressed. When the triangular block passes over the fixing pin, the moving plate and the rubber rod can move downward and reset under the action of the second spring. In this way, the rubber rod can reciprocally strike and vibrate the bottom of the conveyor belt, thereby reciprocally vibrating the shell mold, which can improve the casting quality. S5: After the casting is completed, the first moving module drives the sliding plate to move into the fixed cover. At this time, the waste gas temporarily stored in the fixed cover can be squeezed. Meanwhile, the first one-way valve closes and the second one-way valve opens. At this time, the waste gas temporarily stored in the fixed cover can be squeezed into the gas storage tank through the gas collecting pipe for collection, avoiding the escape of waste gas, being more healthy and environmentally friendly. Moreover, it is convenient to discharge the gas between the hollow cover and the shell mold, and can also improve the quality of casting.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: For this heat treatment equipment and method for investment casting of stainless steel, by setting a fixed cover, etc., during casting, the shell mold is placed on the conveyor belt for transportation. When it is transported below the preheating cover and the hollow cover, the lifting module drives the preheating cover to move downward. Meanwhile, the connecting block drives the hollow cover to move downward, so that the hollow cover can cover the preheated shell mold and there is a gap between the inner wall of the hollow cover and the shell mold. The preheating cover can cover the un-preheated shell mold. Then, the molten metal is poured into the hopper. Then, the molten metal enters the shell mold through the casting pipe. At the same time, the first moving module drives the sliding plate to move away from the fixed cover, the first one-way valve opens, and the second one-way valve closes. At this time, the hot gas generated during casting can enter the hollow cover through the gap and the annular groove. At this time, the outer wall of the shell mold can be heated, which can improve the quality of casting. Then, it enters the preheating cover through the connecting pipe. At this time, the un-preheated shell mold can be preheated. It can not only improve the quality of subsequent casting, but also recycle and reuse the waste heat during casting, being more energy-saving and environmentally friendly. The preheated waste gas can enter the fixed cover through the hose for temporary storage. After the casting is completed, the first moving module drives the sliding plate to move into the fixed cover. At this time, the waste gas temporarily stored in the fixed cover can be squeezed. Meanwhile, the first one-way valve closes and the second one-way valve opens. At this time, the waste gas temporarily stored in the fixed cover can be squeezed into the gas storage tank through the gas collecting pipe for collection, avoiding the escape of waste gas, being more healthy and environmentally friendly. Moreover, it is convenient to discharge the gas in the hollow cover and the shell mold, and can also improve the quality of casting.

[0017] The heat treatment equipment and method for investment casting of this type of stainless steel, by setting an opening and closing mechanism, a rotating mechanism, etc., after the molten metal is poured into the hopper, it will enter the casting pipe and be above the partition plate. Then, the connecting plate is driven to move by the second moving module, and the partition plate is driven to move away from the working cover, thereby opening the casting pipe. At this time, the molten metal in the hopper can enter the shell mold through the casting pipe. Moreover, when the connecting plate moves, it can slide along the bottom of the inclined plate to the bottom of the flat plate, so that the rack can be pushed upward by the L-shaped plate. At the same time, the first spring is compressed. When the rack moves upward, it can push the gear to rotate counterclockwise, and through the rotating shaft and the rotating block, the cover plate is driven to rotate and close, thereby sealing the top of the hopper, which can prevent external air from entering the hollow cover, ensuring the casting quality and avoiding waste of heat.

[0018] The heat treatment equipment and method for investment casting of this type of stainless steel, by setting a vibration mechanism, etc., when the sliding plate moves, the triangular block can be driven to move by the connecting rod. When the triangular block abuts against the lower end of the fixed pin, the moving plate and the rubber rod can be pushed upward, and at the same time, the second spring is compressed. When the triangular block passes over the fixed pin, the moving plate and the rubber rod can move downward and reset under the action of the second spring. Repeating this way, the rubber rod can reciprocally knock and vibrate the bottom of the conveyor belt, thereby reciprocally vibrating the shell mold, which can improve the casting quality. Brief Description of the Drawings

[0019] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the overall structural schematic diagram of another perspective of the present invention; Figure 3 is the partial sectional structural schematic diagram of the preheating cover and the hollow cover in the present invention; Figure 4 is the partial sectional structural schematic diagram of the working cover in the present invention; Figure 5 is Figure 2 the enlarged structural schematic diagram at A in Figure 6 is Figure 3 the enlarged structural schematic diagram at B in Figure 7 is Figure 4 the enlarged structural schematic diagram at C in Figure 8 is Figure 7 the enlarged structural schematic diagram at D in Figure 9 is Figure 8 the enlarged structural schematic diagram at E in

[0020] In the figure: 1, bottom plate; 201, working cover; 202, partition board; 203, second moving module; 204, connecting plate; 301, L-shaped block; 302, rotating shaft; 303, rotating block; 401, gear; 402, rack; 501, second support block; 502, guide rod; 503, slider; 504, first spring; 601, L-shaped plate; 602, inclined plate; 603, flat plate; 701, moving plate; 702, rubber rod; 801, fixing plate; 802, mounting plate; 803, T-shaped guide rod; 804, second spring; 901, fixing pin; 902, connecting rod; 903, triangular block; 10, conveyor; 1001, conveyor belt; 11, lifting module; 12, preheating cover; 13, connecting block; 14, hollow cover; 15, annular groove; 16, sealing plate; 17, connecting frame; 18, first support block; 19, fixing cover; 20, sliding plate; 21, first moving module; 22, connecting pipe; 23, hose; 24, gas collecting pipe; 25, gas storage tank; 26, casting pipe; 27, hopper; 28, cover plate. Detailed implementation mode

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1-9 , the present invention provides a technical solution: a heat treatment device for stainless steel investment casting, including a conveyor 10 arranged on the top of the bottom plate 1, and the conveyor 10 includes a conveyor belt 1001; The top of the bottom plate 1 is connected with a preheating cover 12 through a lifting module 11, and a connecting block 13 is fixedly connected to the side wall of the preheating cover 12. A hollow cover 14 is fixedly connected to the side wall of the connecting block 13, and an annular groove 15 is opened on the inner side wall of the hollow cover 14; The top of the bottom plate 1 is fixedly connected with a first support block 18, and a fixing cover 19 is fixedly connected to the top of the first support block 18. A sliding plate 20 is slidably connected in the fixing cover 19, and a first moving module 21 is arranged between the sliding plate 20 and the bottom plate 1; A connecting pipe 22 is fixedly connected between the hollow cover 14 and the preheating cover 12, and a hose 23 is fixedly connected between the preheating cover 12 and the fixing cover 19. A first one-way valve is arranged in the hose 23, and the conduction direction of the first one-way valve is from the preheating cover 12 to the inside of the fixing cover 19. The top of the bottom plate 1 is fixedly connected with a gas storage tank 25, and a gas collecting pipe 24 is fixedly connected between the gas storage tank 25 and the fixing cover 19. A second one-way valve is arranged in the gas collecting pipe 24, and the conduction direction of the second one-way valve is from the fixing cover 19 to the inside of the gas storage tank 25; It can collect the waste gas generated during casting. At the same time, it can use the waste heat of the waste gas to preheat the shell mold, which can not only improve the quality of subsequent casting, but also recycle and reuse the waste heat during casting, making it more energy-saving and environmentally friendly. During casting, it can prevent external air from entering the hollow cover 14, and at the same time, it is convenient to discharge the gas in the hollow cover 14 and the shell mold, ensuring the casting quality.

[0023] It further includes a sealing plate 16 inserted into the hollow cover 14, and a connecting frame 17 is fixedly connected between the sealing plate 16 and the bottom plate 1. A casting pipe 26 is fixedly inserted at the top of the sealing plate 16. The upper end of the casting pipe 26 is fixedly connected with a hopper 27, and the top of the hopper 27 is rotatably connected with a cover plate 28 through a rotating mechanism. An opening and closing mechanism is arranged on the side wall of the casting pipe 26, and a vibrating mechanism for vibrating the shell mold is arranged below the conveyor belt 1001; By reciprocatingly knocking and vibrating the bottom of the conveyor belt 1001, the shell mold can be reciprocatingly vibrated, thereby improving the casting quality; Please refer to Figure 4 、 Figure 6 and Figure 7 , the opening and closing mechanism includes a working cover 201 fixedly inserted on the side wall of the casting pipe 26, and the working cover 201 is communicated with the casting pipe 26. A partition plate 202 is slidably connected in the working cover 201. The side wall of the working cover 201 is connected with a connecting plate 204 through a second moving module 203, and the connecting plate 204 is fixed to the side wall of the partition plate 202. By driving the connecting plate 204 to move through the second moving module 203, the partition plate 202 is driven to slide in the working cover 201, so as to realize the opening and closing of the casting pipe 26.

[0024] Please refer to Figure 8 and Figure 9 , the rotating mechanism includes two symmetrically arranged L-shaped blocks 301 fixedly connected to the side wall of the hopper 27. The side wall of the L-shaped block 301 is rotatably connected with a rotating block 303 through a rotating shaft 302. The rotating block 303 is fixed to the side wall of the cover plate 28, and the rotation of the rotating shaft 302 is driven by a driving mechanism. By driving the rotating shaft 302 to rotate through the driving mechanism, the rotation of the rotating shaft 302 drives the rotation of the rotating block 303, thereby driving the cover plate 28 to rotate and close or open.

[0025] Please refer to Figure 9 , the driving mechanism includes a gear 401 fixedly sleeved on the side wall of the rotating shaft 302. The side wall of the L-shaped block 301 is connected with a rack 402 through a first reset mechanism. The rack 402 is meshed with the gear 401, and the movement of the rack 402 is pushed by a first pushing mechanism. By pushing the rack 402 to move through the first pushing mechanism, the movement of the rack 402 drives the rotation of the gear 401, and further drives the rotation of the rotating shaft 302.

[0026] Please refer to Figure 9 Figure 9 , the first reset mechanism includes two symmetrically arranged second support blocks 501 fixedly connected to the side wall of the L-shaped block 301. Two symmetrically arranged guide rods 502 are fixedly connected to the opposite side walls of the two second support blocks 501. A slider 503 is sleeved on the side wall of each guide rod 502. The slider 503 is fixed to the side wall of the rack 402. A first spring 504 is sleeved on the side wall of each guide rod 502, which plays a role in guiding and resetting the movement of the rack 402.

[0027] Please refer to Figures 7-9 Figures 7-9 , the first pushing mechanism includes an L-shaped plate 601 fixedly connected to the side wall of the rack 402. The lower end of the L-shaped plate 601 is fixedly connected with an inclined plate 602. The other end of the inclined plate 602 is fixedly connected with a flat plate 603. When the connecting plate 204 moves, it can slide along the bottom of the inclined plate 602 to the bottom of the flat plate 603, so as to push the rack 402 to move upward through the L-shaped plate 601.

[0028] Please refer to Figure 5 and Figure 6 Figure 6 , the vibration mechanism includes a moving plate 701. A plurality of rubber rods 702 arranged in an array are fixedly connected to the top of the moving plate 701. The moving plate 701 is connected to the top of the bottom plate 1 through a second reset mechanism. The movement of the moving plate 701 is pushed by a second pushing mechanism. Through the second reset mechanism and the second pushing mechanism, the moving plate 701 and the rubber rods 702 move up and down reciprocally. In this way, the rubber rods 702 can reciprocally knock and vibrate the bottom of the conveyor belt 1001, so as to reciprocally vibrate the shell mold, which can improve the quality of casting.

[0029] Please refer to Figure 5 and Figure 6 Figure 6 , the second reset mechanism includes a fixing plate 801 fixedly connected to the top of the bottom plate 1. An installation plate 802 is fixedly connected to the side wall of the fixing plate 801. Two symmetrically arranged T-shaped guide rods 803 are inserted into the bottom of the installation plate 802. The upper ends of the T-shaped guide rods 803 are fixed to the bottom of the moving plate 701. A second spring 804 is sleeved on the side wall of each T-shaped guide rod 803, which plays a role in guiding and resetting the movement of the moving plate 701.

[0030] Please refer to Figure 5 and Figure 6, the second driving mechanism includes a fixing pin 901 fixedly connected to the bottom of the moving plate 701, and a connecting rod 902 is fixedly connected to the side wall of the sliding plate 20. The other end of the connecting rod 902 penetrates through the side wall of the fixing cover 19, and a plurality of triangular blocks 903 arranged in an array are fixedly connected to the top of the connecting rod 902. When the sliding plate 20 moves, the triangular blocks 903 can be driven to move through the connecting rod 902. When the triangular blocks 903 abut against the lower end of the fixing pin 901, the moving plate 701 and the rubber rod 702 can be pushed to move upward.

[0031] A heat treatment method for investment casting of stainless steel, using the above-mentioned heat treatment equipment for investment casting of stainless steel, includes the following steps: S1: When casting, place the shell mold on the conveyor belt 1001 for transportation. When it is transported below the preheating cover 12 and the hollow cover 14, drive the preheating cover 12 to move downward through the lifting module 11. At the same time, drive the hollow cover 14 to move downward through the connecting block 13, so that the hollow cover 14 can cover the preheated shell mold and there is a gap between the inner wall of the hollow cover 14 and the shell mold, and the preheating cover 12 can cover the un-preheated shell mold; S2: Then, pour the molten metal into the hopper 27. After the molten metal is poured into the hopper 27, it will enter the casting tube 26 and be above the partition plate 202. Then, drive the connecting plate 204 to move through the second moving module 203, and drive the partition plate 202 to move away from the working cover 201, thereby opening the casting tube 26. At this time, the molten metal in the hopper 27 can enter the shell mold through the casting tube 26. And when the connecting plate 204 moves, it can slide along the bottom of the inclined plate 602 to the bottom of the flat plate 603, so that the rack 402 can be pushed upward by the L-shaped plate 601. At the same time, the first spring 504 is compressed. When the rack 402 moves upward, it can push the gear 401 to rotate counterclockwise, and drive the cover plate 28 to rotate and close through the rotating shaft 302 and the rotating block 303, thereby sealing the top of the hopper 27. It can prevent external air from entering the hollow cover 14, ensure the casting quality, and avoid waste of heat; S3: Next, the molten metal enters the shell mold through the casting pipe 26. At the same time, the first moving module 21 drives the sliding plate 20 to move away from the fixed cover 19. The first one-way valve opens and the second one-way valve closes. At this time, the hot gas generated during casting can enter the hollow cover 14 through the gap and the annular groove 15. At this time, the outer wall of the shell mold can be heated, improving the casting quality. Then, it enters the preheating cover 12 through the connecting pipe 22. At this time, the shell mold to be preheated can be preheated, which can not only improve the quality of subsequent casting, but also recycle and reuse the waste heat during casting, making it more energy-saving and environmentally friendly. The preheated waste gas can enter the fixed cover 19 through the hose 23 for temporary storage; S4: When the sliding plate 20 moves, it can drive the triangular block 903 to move through the connecting rod 902. When the triangular block 903 abuts against the lower end of the fixed pin 901, it can push the moving plate 701 and the rubber rod 702 to move upward. At the same time, the second spring 804 is compressed. When the triangular block 903 passes over the fixed pin 901, the moving plate 701 and the rubber rod 702 can move downward and reset under the action of the second spring 804. Repeating this process can make the rubber rod 702 reciprocally knock and vibrate the bottom of the conveyor belt 1001, thereby reciprocally vibrating the shell mold and improving the casting quality; S5: After casting is completed, the first moving module 21 drives the sliding plate 20 to move into the fixed cover 19. At this time, the waste gas temporarily stored in the fixed cover 19 can be squeezed. At the same time, the first one-way valve closes and the second one-way valve opens. At this time, the waste gas temporarily stored in the fixed cover 19 can be squeezed into the gas storage tank 25 through the gas collecting pipe 24 for collection, avoiding the escape of waste gas, being more healthy and environmentally friendly. Moreover, it is convenient to discharge the gas between the hollow cover 14 and the shell mold, and can also improve the casting quality.

[0032] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art. Coupled with the circuit connection adopting the conventional connection method in the prior art, it will not be elaborated here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0033] The above describes the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Generally speaking, if those skilled in the art are inspired by it and, without departing from the gist of the present invention, creatively design a structural manner and an embodiment similar to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A heat treatment device for investment casting of stainless steel, comprising a conveyor (10) arranged on the top of a bottom plate (1), and the conveyor (10) includes a conveyor belt (1001), and is characterized in that: A preheating hood (12) is connected to the top of the bottom plate (1) through a lifting module (11), and a connecting block (13) is fixedly connected to the side wall of the preheating hood (12). A hollow hood (14) is fixedly connected to the side wall of the connecting block (13), and an annular groove (15) is formed on the inner side wall of the hollow hood (14); A first support block (18) is fixedly connected to the top of the bottom plate (1), and a fixed hood (19) is fixedly connected to the top of the first support block (18). A sliding plate (20) is slidably connected in the fixed hood (19), and a first moving module (21) is arranged between the sliding plate (20) and the bottom plate (1); A connecting pipe (22) is fixedly connected between the hollow hood (14) and the preheating hood (12), and a flexible pipe (23) is fixedly connected between the preheating hood (12) and the fixed hood (19). A first one-way valve is arranged in the flexible pipe (23), and an air storage tank (25) is fixedly connected to the top of the bottom plate (1). A gas collecting pipe (24) is fixedly connected between the air storage tank (25) and the fixed hood (19), and a second one-way valve is arranged in the gas collecting pipe (24).

2. The heat treatment equipment for investment casting of stainless steel according to claim 1, characterized in that: It further includes a sealing plate (16) inserted into the hollow hood (14), and a connecting frame (17) is fixedly connected between the sealing plate (16) and the bottom plate (1). A casting pipe (26) is fixedly inserted into the top of the sealing plate (16). The upper end of the casting pipe (26) is fixedly connected to a hopper (27), and a cover plate (28) is rotatably connected to the top of the hopper (27) through a rotating mechanism. An opening and closing mechanism is arranged on the side wall of the casting pipe (26), and a vibration mechanism for vibrating the shell mold is arranged below the conveyor belt (1001).

3. The heat treatment equipment for investment casting of stainless steel according to claim 2, wherein: The opening and closing mechanism includes a working hood (201) fixedly inserted into the side wall of the casting pipe (26), and the working hood (201) is communicated with the casting pipe (26). A partition plate (202) is slidably connected in the working hood (201). The side wall of the working hood (201) is connected to a connecting plate (204) through a second moving module (203), and the connecting plate (204) is fixedly connected to the side wall of the partition plate (202).

4. A heat treatment device for investment casting of stainless steel according to claim 2 or 3, characterized in that: The rotating mechanism includes two symmetrically arranged L-shaped blocks (301) fixedly connected to the side wall of the hopper (27), and a rotating block (303) is rotatably connected to the side wall of the L-shaped block (301) through a rotating shaft (302). The rotating block (303) is fixedly connected to the side wall of the cover plate (28), and the rotation of the rotating shaft (302) is driven by a driving mechanism.

5. The heat treatment equipment for investment casting of stainless steel according to claim 4, characterized in that: The driving mechanism includes a gear (401) fixedly sleeved on the side wall of the rotating shaft (302), and a rack (402) is connected to the side wall of the L-shaped block (301) through a first reset mechanism. The rack (402) is meshed with the gear (401), and the movement of the rack (402) is pushed by a first pushing mechanism.

6. The heat treatment equipment for investment casting of stainless steel according to claim 5, characterized in that: The first reset mechanism includes two symmetrically arranged second support blocks (501) fixedly connected to the side wall of the L-shaped block (301), and two symmetrically arranged guide rods (502) are fixedly connected to the opposite side walls of the two second support blocks (501). A slider (503) is sleeved on the side wall of each guide rod (502). The slider (503) is fixedly connected to the side wall of the rack (402), and a first spring (504) is sleeved on the side wall of each guide rod (502). The first pushing mechanism includes an L-shaped plate (601) fixedly connected to the side wall of the rack (402), and an inclined plate (602) is fixedly connected to the lower end of the L-shaped plate (601). The other end of the inclined plate (602) is fixedly connected to a flat plate (603).

7. The heat treatment equipment for investment casting of stainless steel according to claim 2, characterized in that: The vibration mechanism includes a moving plate (701), and a plurality of rubber rods (702) arranged in an array are fixedly connected to the top of the moving plate (701). The moving plate (701) is connected to the top of the bottom plate (1) through a second reset mechanism, and the movement of the moving plate (701) is pushed by a second pushing mechanism.

8. A heat treatment device for investment casting of stainless steel according to claim 7, characterized in that: The second reset mechanism includes a fixing plate (801) fixedly connected to the top of the bottom plate (1), and a mounting plate (802) is fixedly connected to the side wall of the fixing plate (801). Two symmetrically arranged T-shaped guide rods (803) are inserted into the bottom of the mounting plate (802). The upper ends of the T-shaped guide rods (803) are fixedly connected to the bottom of the moving plate (701), and a second spring (804) is sleeved on the side wall of each T-shaped guide rod (803).

9. The heat treatment equipment for investment casting of stainless steel according to claim 7, characterized in that: The second pushing mechanism includes a fixing pin (901) fixedly connected to the bottom of the moving plate (701), and a connecting rod (902) is fixedly connected to the side wall of the sliding plate (20). The other end of the connecting rod (902) penetrates through the side wall of the fixing cover (19), and a plurality of triangular blocks (903) arranged in an array are fixedly connected to the top of the connecting rod (902).

10. A heat treatment method for investment casting of stainless steel, using a heat treatment device for investment casting of stainless steel as described in any one of claims 1-9, characterized in that: It includes the following steps: S1: During casting, the shell mold is placed on the conveyor belt (1001) for transportation. When it is transported below the preheating cover (12) and the hollow cover (14), the lifting module (11) drives the preheating cover (12) to move downward. At the same time, the connecting block (13) drives the hollow cover (14) to move downward, so that the hollow cover (14) can cover the preheated shell mold and there is a gap between the inner wall of the hollow cover (14) and the shell mold, and the preheating cover (12) can cover the unpreheated shell mold. S2: Next, pour the molten metal into the hopper (27). After the molten metal is poured into the hopper (27), it will enter the casting pipe (26) and be above the partition plate (202). Then, drive the connecting plate (204) to move through the second moving module (203), and drive the partition plate (202) to move away from the working cover (201), thereby opening the casting pipe (26). At this time, the molten metal in the hopper (27) can enter the shell mold through the casting pipe (26). Moreover, when the connecting plate (204) moves, it can slide along the bottom of the inclined plate (602) to the bottom of the flat plate (603), so as to push the rack (402) to move upward through the L-shaped plate (601). At the same time, the first spring (504) is compressed. When the rack (402) moves upward, it can push the gear (401) to rotate counterclockwise. And through the rotating shaft (302) and the rotating block (303), drive the cover plate (28) to rotate and close, thereby sealing the top of the hopper (27), which can prevent external air from entering the hollow cover (14), ensuring the casting quality while avoiding waste of heat; S3: Next, the molten metal enters the shell mold through the casting pipe (26). At the same time, drive the sliding plate (20) to move away from the fixed cover (19) through the first moving module (21). The first one-way valve opens and the second one-way valve closes. At this time, the hot gas generated during casting can enter the hollow cover (14) through the gap and the annular groove (15). At this time, the outer wall of the shell mold can be heated, which can improve the casting quality. Then, enter the preheating cover (12) through the connecting pipe (22). At this time, the shell mold to be preheated can be preheated. This can not only improve the quality of subsequent casting, but also recycle and reuse the waste heat during casting, which is more energy-saving and environmentally friendly. The preheated waste gas can enter the fixed cover (19) through the hose (23) for temporary storage; S4: When the sliding plate (20) moves, it can drive the triangular block (903) to move through the connecting rod (902). When the triangular block (903) abuts against the lower end of the fixed pin (901), it can push the moving plate (701) and the rubber rod (702) to move upward. At the same time, the second spring (804) is compressed. When the triangular block (903) passes over the fixed pin (901), the moving plate (701) and the rubber rod (702) can move downward and reset under the action of the second spring (804). Repeating this way can make the rubber rod (702) reciprocally knock and vibrate the bottom of the conveyor belt (1001), thereby reciprocally vibrating the shell mold, which can improve the casting quality; S5: After the casting is completed, the first moving module (21) drives the sliding plate (20) to move into the fixed cover (19). At this time, the waste gas temporarily stored in the fixed cover (19) can be squeezed. At the same time, the first one-way valve closes and the second one-way valve opens. At this time, the waste gas temporarily stored in the fixed cover (19) can be squeezed into the gas storage tank (25) through the gas collecting pipe (24) for collection, avoiding the escape of waste gas, being more healthy and environmentally friendly. Moreover, it is convenient to discharge the gas between the hollow cover (14) and the shell mold, and can also improve the casting quality.

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