A shell firing apparatus for investment casting

Abstract

This utility model relates to a shell firing device for investment casting, including a firing furnace, a shell placement plate, and a transport vehicle that moves back and forth at the furnace opening of the firing furnace. A bracket supporting both sides of the shell placement plate is fixedly connected inside the firing furnace. The transport vehicle includes a frame and two intermediate shafts axled to the frame. A lifting main shaft extending back and forth is axled to the frame. A lifting motor driving the lifting main shaft is fixedly connected to the rear end of the frame. The lifting main shaft and the two intermediate shafts are connected in a transmission connection. Lifting mechanisms are installed at both ends of the intermediate shafts. The lifting mechanism includes a push rod vertically slidably connected to the upper end of the frame and a screw rod axled to the frame. The screw rod is threadedly connected to the push rod. A driving bevel gear is fixedly connected to the end of the intermediate shaft, and a driven bevel gear meshing with the driving bevel gear is fixedly connected to the screw rod. The transport vehicle also includes two axles axled to the frame, with wheels fixedly connected to the left and right ends of the axles.

Description

Technical Field

[0001] This utility model relates to the field of investment casting technology, specifically to a shell firing device for investment casting. Background Technology

[0002] In investment casting, the mold shell must be baked at high temperatures before pouring to remove residual mold material and enhance its strength and permeability. This process is typically carried out in a baking furnace at 950-1150℃. Traditionally, the placement plate supporting the mold shell needs to be moved in and out of the baking furnace using a trolley. However, this high-temperature environment poses a severe challenge to the trolley: if it remains inside the furnace during baking, its overall structure and components (especially the power system) will be severely damaged due to prolonged extreme temperatures, significantly shortening its service life; even if the trolley is removed before baking, it is still necessary to wait for the furnace temperature to naturally drop to a safe level after baking (which usually takes a long time) before the trolley can enter the furnace to remove the hot mold shell placement plate. Otherwise, the residual high-temperature heat inside the furnace will still cause irreversible damage to the trolley's motor, transmission mechanism, and other core power systems. This contradiction between equipment protection and production efficiency leads to high equipment maintenance costs, extended production cycles, and low energy efficiency, becoming a critical pain point that urgently needs to be addressed in the investment casting baking process. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies by providing a shell firing device for investment casting.

[0004] This utility model is achieved through the following technical solution: a shell firing device for investment casting is provided, including a firing furnace, a shell placement plate, and a transport vehicle that moves back and forth at the furnace opening of the firing furnace. A bracket supporting both sides of the shell placement plate is fixedly connected inside the firing furnace. The transport vehicle includes a frame and two intermediate shafts axled to the frame. A lifting main shaft extending back and forth is axled to the frame. A lifting motor driving the lifting main shaft to rotate is fixedly connected to the rear end of the frame. The lifting main shaft and the two intermediate shafts are connected in a transmission connection. Lifting mechanisms are installed at both ends of the intermediate shafts. The lifting mechanism includes a push rod vertically slidably connected to the upper end of the frame and a screw rod axled to the frame. The screw rod is threadedly connected to the push rod. A driving bevel gear is fixedly connected to the end of the intermediate shaft, and a driven bevel gear meshing with the driving bevel gear is fixedly connected to the screw rod.

[0005] As an optimization, a lifting worm gear is fixedly connected to the intermediate shaft, and a lifting worm gear that meshes with the lifting worm gear is fixedly connected to the lifting main shaft.

[0006] As an optimization, a guide sleeve is fixedly connected to the upper end of the frame, and the top rod is a rectangular rod that slides vertically inside the guide sleeve.

[0007] As an optimization, a horizontal top plate is fixed to the upper end of the top rod.

[0008] As an optimization, the lower end of the push rod has a threaded hole that matches the screw.

[0009] As an optimization, the transport vehicle also includes two axles connected to the frame, with wheels fixed to the left and right ends of the axles. A main shaft extending forward and backward is connected to the frame, and a motor for driving the main shaft to rotate is fixed to the rear end of the frame. The main shaft is connected to the two axles in a transmission connection.

[0010] As an optimization, a traveling worm gear is fixedly connected to the axle, and a traveling worm gear that meshes with the traveling worm gear is fixedly connected to the traveling main shaft.

[0011] The beneficial effects of this utility model are as follows: The shell baking device for investment casting of this utility model places the power source (walking motor and lifting motor) of the transport vehicle outside the furnace opening, transmitting power to the walking wheel axles and lifting mechanism located on the frame. This design ensures that when the transport vehicle needs to enter the high-temperature furnace to perform critical operations such as feeding, lowering, lifting, and removing the shell placement plate, the temperature-sensitive motor is always kept in a normal temperature environment outside the furnace, fundamentally isolating it from the damage caused by high-temperature heat radiation and heat conduction. This greatly improves the reliability and service life of the motor, significantly reducing equipment failure rate and maintenance costs. Simultaneously, because the power system can operate safely without waiting for the furnace to cool down, the transport vehicle can immediately enter the furnace to remove the shell placement plate after baking is completed and the furnace door is opened, without experiencing a long natural cooling period. This significantly shortens production auxiliary time, significantly improves overall production efficiency and equipment turnover rate, and saves energy consumption. Attached Figure Description

[0012] Figure 1 This is a front view of the present invention in use;

[0013] Figure 2 This is a front view of the present invention;

[0014] Figure 3 This is a cross-sectional view of the lifting mechanism of this utility model;

[0015] Figure 4 This utility model Figure 2 Sectional view of plane AA;

[0016] As shown in the figure:

[0017] 1. Roasting furnace; 2. Mold placement plate; 3. Bracket; 4. Furnace opening; 5. Furnace door; 6. Furnace door guide rail; 7. Car frame; 8. Lifting mechanism; 81. Guide sleeve; 82. Top rod; 83. Screw; 84. Driven bevel gear; 85. Driven bevel gear; 9. Wheel and axle; 10. Wheel; 11. Traveling main shaft; 12. Traveling worm; 13. Traveling worm wheel; 14. Traveling motor; 15. Intermediate shaft; 16. Lifting main shaft; 17. Lifting worm; 18. Lifting worm wheel; 19. Lifting motor. Detailed Implementation

[0018] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0019] like Figures 1-4 As shown, the present invention discloses a shell baking device for investment casting, including a baking furnace 1, a shell placement plate 2, and a transport vehicle that moves back and forth at the furnace opening 4 of the baking furnace 1. The baking furnace 1 has a furnace opening 4 on the front for the transport vehicle and the shell placement plate 2 to enter and exit. The shell is placed on the shell placement plate 2. The furnace opening 4 is equipped with a lifting furnace door 5. The furnace door 5 is guided to rise and fall by furnace door guide rails 6 on both sides, and is driven to rise and fall by a motor driving a steel wire rope.

[0020] The roasting furnace 1 is fixedly connected to brackets 3 on both sides of the shell placement plate 2. After the shell placement plate 2 enters the roasting furnace 1, it can fall down and be supported on the brackets 3. The shell placement plate 2 is composed of a frame and refractory bricks. The frame is welded from rectangular tubes, and refractory bricks are laid on top. The shell is placed on the refractory bricks.

[0021] The transport vehicle moves back and forth, allowing it to move inside and outside the roasting furnace 1. When the transport vehicle moves forward, it enters the roasting furnace, and when it moves backward, it leaves the roasting furnace. The total length of the transport vehicle is greater than the internal dimensions of the roasting furnace, so that when the transport vehicle enters the roasting furnace, its rear end is located outside the roasting furnace.

[0022] The transport vehicle is used to transport the shell placement plate 2 with the shell to the roasting furnace, and then lower the shell placement plate 2 so that it is supported on the bracket 3. Then the transport vehicle leaves. After roasting is completed, it enters the roasting furnace 1, lifts the shell placement plate 2 and moves it out.

[0023] like Figure 2-4 As shown, the transport vehicle includes a frame 7 and two axles 9 connected to the frame 7. The axles 9 extend to the left and right, and the two axles 9 are arranged in front and behind. The axles 9 are rotatably connected to the frame 7 through bearings. Wheels 10 are fixed to the left and right ends of the axles 9. Alternatively, guide rails can be laid on the ground, and the wheels 10 can be designed as grooved wheels to play a guiding role.

[0024] In order to achieve the rotation of the two wheel axles 9, a travel main shaft 11 extending forward and backward is connected to the frame 7, and a travel motor 14 that drives the travel main shaft 11 to rotate is fixed to the rear end of the frame 7. The travel main shaft 11 is connected to the two wheel axles 9 in a transmission connection.

[0025] In this embodiment, the transmission connection is achieved as follows: a traveling worm gear 13 is fixedly connected to the axle 9, and a traveling worm 12 that meshes with the traveling worm gear 13 is fixedly connected to the traveling main shaft 11. Therefore, by rotating the traveling main shaft 11, the two traveling worm gears 13 are driven to rotate, thus realizing the synchronous rotation and movement of the four wheels 10.

[0026] To achieve the lifting of the shell placement plate 2, the transport vehicle also includes two intermediate shafts 15 axled to the frame 7. The intermediate shafts 15 extend laterally and are rotatably connected to the frame 7 via bearings. To achieve synchronous rotation of the two intermediate shafts 15, a lifting main shaft 16 extending forward and backward is axled to the frame 7. A lifting motor 19 for driving the lifting main shaft 16 to rotate is fixed to the rear end of the frame 7. The lifting main shaft 16 and the two intermediate shafts 15 are connected by a transmission mechanism. In this embodiment, the transmission connection is as follows: a lifting worm gear 18 is fixed to the intermediate shaft 15, and a lifting worm 17 meshing with the lifting worm gear 18 is fixed to the lifting main shaft 16, thereby driving the two intermediate shafts 15 to rotate synchronously via the lifting main shaft 16.

[0027] The intermediate shaft 15 is equipped with lifting mechanisms 8 at both ends, so a total of four lifting mechanisms 8 are provided. The lifting mechanism 8 includes a top rod 82 that is vertically slidably connected to the upper end of the frame 7 and a screw 83 that is axially connected to the frame 7. The upper end of the top rod 82 is fixed with a horizontal top plate to increase the contact area with the shell placement plate 2.

[0028] In this embodiment, a guide sleeve 81 is fixedly connected to the upper end of the frame 7, and the push rod 82 is a rectangular rod that slides vertically inside the guide sleeve 81. The screw 83 is vertically arranged, and its lower end is rotatably connected to the frame 7. The lower end of the push rod 82 has a threaded hole that matches the screw 83, so that the screw 83 and the push rod 82 are threadedly connected.

[0029] A driving bevel gear 85 is fixedly connected to the end of the intermediate shaft 15, and a driven bevel gear 84 that meshes with the driving bevel gear 85 is fixedly connected to the screw 83. Figure 2 As shown, in this embodiment, the screws 83 at both ends of the same intermediate shaft 15 have opposite thread directions, so that the rotation of the intermediate shaft 15 drives the two push rods 82 to rise and fall synchronously.

[0030] How to use this utility model:

[0031] When placing the mold shell, the transport vehicle is located outside the roasting furnace 1, and the mold shell placement plate 2 is supported on the four top rods 82 of the transport vehicle. The mold shell to be roasted is placed on the mold shell placement plate 2.

[0032] Then, the transport vehicle drives the main shaft 11 to rotate via the walking motor 14, which in turn drives the axle 9 to rotate via the worm gear structure, thus passing through the furnace opening 4 and entering the roasting furnace 1. Then, the lifting motor 19 drives the lifting main shaft 16 to rotate, which in turn drives the two intermediate shafts 15 to rotate via the worm gear structure, thereby driving the screws in the four lifting mechanisms 8 to rotate. Through the threaded connection between the screw 83 and the top rod 82, the top rod 82 is driven to descend, thus supporting the shell placement plate 2 on the brackets 3 on both sides. Then, the transport vehicle exits the roasting furnace.

[0033] After roasting, the transport vehicle enters the roasting furnace 1, lifts the shell placement plate 2 and moves it out. When the transport vehicle is inside the roasting furnace 1, the walking motor 14 and the lifting motor 19, which serve as the power source, are located outside the roasting furnace 1, thereby reducing motor damage caused by high temperature.

[0034] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A mold shell firing apparatus for investment casting, characterized by: The assembly includes a roasting furnace (1), a shell placement plate (2), and a transport vehicle that moves back and forth at the furnace opening (4) of the roasting furnace (1). The roasting furnace (1) has brackets (3) fixedly connected to both sides of the shell placement plate (2). The transport vehicle includes a frame (7) and two intermediate shafts (15) axled onto the frame (7). A lifting main shaft (16) extending back and forth is axled onto the frame (7). A lifting motor (19) for driving the lifting main shaft (16) to rotate is fixedly connected to the rear end of the frame (7). The main shaft (16) and two intermediate shafts (15) are connected by a drive. The two ends of the intermediate shafts (15) are equipped with lifting mechanisms (8). The lifting mechanism (8) includes a push rod (82) that slides vertically on the upper end of the frame (7) and a screw (83) that is axially connected to the frame (7). The screw (83) is threadedly connected to the push rod (82). The end of the intermediate shaft (15) is fixedly connected to a drive bevel gear (85), and the screw (83) is fixedly connected to a driven bevel gear (84) that meshes with the drive bevel gear (85).

2. A mould shell firing device for investment casting according to claim 1, characterised in that: A lifting worm gear (18) is fixedly connected to the intermediate shaft (15), and a lifting worm (17) that meshes with the lifting worm gear (18) is fixedly connected to the lifting main shaft (16).

3. A device for firing a shell for investment casting according to claim 1, characterized in that: The upper end of the frame (7) is fixedly connected to a guide sleeve (81), and the top rod (82) is a rectangular rod that slides vertically inside the guide sleeve (81).

4. The shell firing apparatus for investment casting according to claim 1, characterized in that: The top end of the top rod (82) is fixed to a horizontal top plate.

5. A device for firing a shell for investment casting according to claim 1, wherein: The lower end of the push rod (82) has a threaded hole that matches the screw rod (83).

6. A device for firing a mould shell for investment casting according to any one of claims 1 to 5, characterised in that: The transport vehicle also includes two axles (9) connected to the frame (7), with wheels (10) fixed to the left and right ends of the axles (9), a traveling main shaft (11) extending forward and backward connected to the frame (7), and a traveling motor (14) for driving the traveling main shaft (11) to rotate fixed to the rear end of the frame (7). The traveling main shaft (11) is connected to the two axles (9) in a transmission connection.

7. A mould shell firing device for investment casting according to claim 6, characterised in that: A traveling worm gear (13) is fixedly connected to the axle (9), and a traveling worm (12) that meshes with the traveling worm gear (13) is fixedly connected to the traveling main shaft (11).

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