A device for intermediate frequency heating and feeding of a casting head and a process thereof

Abstract

The application discloses a kind of casting riser intermediate frequency heating feeding device and its process, including base, rotating plate, rotating assembly, lifting assembly, bottom plate, moving assembly, moving plate, mounting plate and intermediate frequency induction heating assembly;The rotating plate is horizontally parallel and interval arranged on the upper surface of base, and is connected with the horizontal rotation of base by rotating assembly;Bottom plate is horizontally interval arranged on the directly above rotating plate, and lifting assembly is arranged between the two, and makes the vertical up-and-down motion of bottom plate by lifting assembly;Horizontal moving plate is arranged on the upper surface of bottom plate, and moving plate makes horizontal transverse reciprocating motion on the upper surface of bottom plate by moving assembly;L-shaped mounting plate is arranged on the upper surface of moving plate, the vertical edge of mounting plate is vertically fixedly connected with the upper surface of moving plate, and its horizontal edge extends horizontally out of the right side of moving plate, and intermediate frequency induction heating assembly is arranged on the lower surface of its horizontal edge.The application can ensure that the molten metal in the riser can smoothly enter the casting, and ensure the feeding effect of riser.

Description

Technical Field

[0001] This invention relates to the field of casting technology, specifically to a medium-frequency heating and feeding device for casting risers and its process. Background Technology

[0002] Cast steel parts have important applications in many industries such as power plants, mining equipment, shipbuilding, and petrochemicals, and their quality is of paramount importance. However, during the production process, due to the large size of the castings, long solidification time, and large shrinkage, various forms of defects often occur, making it difficult to meet requirements. Riser design is an effective measure to solve the above-mentioned defect problems, but if the molten metal in the riser solidifies before the casting, the residual molten metal in the riser cannot enter the casting, which can also cause shrinkage cavities and porosity defects.

[0003] Currently, "insulating risers" and "heat-generating risers" are commonly used. However, since neither of them has a stable heat source, they cannot maintain a stable thermal center of the molten metal for a long time, resulting in poor riser feeding effect. Therefore, electrically heated risers have emerged.

[0004] Electric heating methods mainly include electric arc heating, electroslag heating, and electromagnetic induction heating. Both electroslag heating and electric arc heating pollute the molten metal during the heating process. Furthermore, electric arc heating, due to the use of graphite electrodes, increases the carbon content of the molten metal. Electromagnetic induction heating, however, is different. A changing current passing through an induction coil generates an alternating magnetic field. A conductor in this alternating magnetic field generates an induced current, which, through the conductor, produces a heating effect, achieving a conversion between electricity, magnetism, and heat. Therefore, compared to ordinary risers, insulating risers, and exothermic risers, induction heating risers have advantages such as high heating efficiency, no environmental pollution, and the ability to maintain a stable thermal center in the molten metal for a long time. However, in actual production, some large cast steel parts are large in size and have high riser positions, making it difficult to manually place the induction heating coil, which to some extent affects the use of induction heating feeding devices. Therefore, these problems urgently need to be solved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a medium-frequency heating feeding device and process for casting risers, which can effectively reduce the cooling rate of casting risers, ensure that the molten metal in the risers can smoothly enter the casting, thereby ensuring the feeding effect of the risers and improving the product qualification rate.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The innovative feature of the medium-frequency heating and feeding device for casting risers of the present invention is that it includes a base, a rotating plate, a rotating assembly, a lifting assembly, a bottom plate, a moving assembly, a moving plate, a mounting plate, and a medium-frequency induction heating assembly; the rotating plate is a horizontally arranged circular plate, and is parallel to and spaced on the upper surface of the horizontally arranged base, and is horizontally rotatably connected to the base via the rotating assembly; the bottom plate is horizontally parallel and spaced directly above the rotating plate, and a lifting assembly is provided between the two, which causes the bottom plate to move vertically up and down on the rotating plate. Movement; A movable plate is horizontally provided on the right side of the upper surface of the base plate, and the movable plate performs horizontal reciprocating movement on the upper surface of the base plate through a movable component; an L-shaped mounting plate is provided on the upper surface of the movable plate, the vertical side of the mounting plate is vertically fixedly connected to the upper surface of the movable plate near its right edge, and its horizontal side extends horizontally out of the right side of the movable plate, and a medium-frequency induction heating component matching the riser is provided on the lower surface of its horizontal side. Then, through horizontal rotation, vertical up-and-down movement and horizontal movement, the medium-frequency induction heating component is coaxially sleeved on the riser to perform riser feeding operation.

[0007] Preferably, the system also includes hydraulic cylinders, casters, and outriggers; the base is a horizontally arranged hollow cuboid structure, and hydraulic cylinders are vertically and symmetrically arranged at the four right angles of its inner bottom surface. The four hydraulic cylinders operate synchronously, and the piston rod of each hydraulic cylinder extends vertically downward from the lower surface of the base and is connected to the corresponding caster; outriggers are vertically and symmetrically arranged at the four right angles of the lower surface of the base, and each outrigger is located within a square area enclosed by the four casters; when in the upper limit position, the lower end face of each caster is located above the horizontal plane where the lower end of the corresponding outrigger is located, and under the drive of the hydraulic cylinders, the movement state and the riser feeding state are switched through the cooperation of the casters and outriggers.

[0008] Preferably, the rotating assembly is configured to not interfere with the four hydraulic cylinders, and the rotating assembly includes a side plate, a gear shaft, a main bevel gear, a driven bevel gear, and a motor; a gear shaft is also vertically arranged in the middle of the interior of the base, the lower end of the gear shaft is rotatably connected to the inner bottom surface of the base, and its upper end extends vertically upward from the upper surface of the base and is coaxially fixedly connected to the middle of the lower surface of the rotating plate; a driven bevel gear is also horizontally coaxially sleeved and fixed on the gear shaft relative to the interior of the base, and the driven bevel gear is configured to not interfere with the base; a matching side plate is also vertically arranged in the interior of the base relative to the right side of the driven bevel gear, and a motor is also horizontally arranged in the interior of the base relative to the driven bevel gear and the side plate, the fixed end of the motor is screwed to the left side of the side plate, and its output end is horizontally arranged in the left direction, and is connected to the driven bevel gear through the meshing of the main bevel gear and the driven bevel gear. Thus, driven by the motor, the gear shaft rotates around its own axis through the meshing of the main bevel gear and the driven bevel gear, and drives the rotating plate to rotate horizontally.

[0009] Preferably, it also includes a roller assembly; several roller assemblies are connected to the upper surface of the base and abut against the lower surface of the rotating plate, and the roller assemblies are coaxially arranged with the rotating plate and are respectively arranged without interfering with the gear shaft; each roller assembly is conical, with one end near the gear shaft being the small end and the other end being the large end, so as to accommodate a smaller linear velocity near the gear shaft when the rotating plate rotates.

[0010] Preferably, the base plate is a circular structure that matches the rotating plate, and is aligned vertically with the rotating plate, ensuring that the lifting assembly is within the vertical coverage area of ​​the base plate, so that the base plate can move vertically up and down through the lifting assembly, rotate horizontally synchronously with the rotating plate, and move horizontally synchronously with the base.

[0011] Preferably, the moving assembly includes an electric push rod, a stiffening plate, a slide rail, a slider, and a limiting plate; the moving plate has an L-shaped structure, with its vertical side vertically arranged on the upper surface of the base plate near the center, and its horizontal side horizontally arranged to the right; an electric push rod is also horizontally arranged on the upper surface of the base plate relative to the left side of the moving plate, the tail of the electric push rod is fixedly installed on the corresponding position on the upper surface of the base plate by the stiffening plate, and its pushing end is horizontally arranged to the right and screwed to the outer surface of the vertical side of the moving plate, thereby pushing the moving plate to perform horizontal reciprocating sliding on the upper surface of the base plate; horizontally arranged sliders are also symmetrically arranged at intervals on the lower surface of the horizontal side of the moving plate, the right end of each slider is flush with the end face of the horizontal side of the moving plate, and its left end extends to the side of the moving plate. At the vertical edge of the moving plate; on the upper surface of the base plate, a horizontal slide rail matching the slider is also provided relative to each slider position. Each slide rail passes through the area directly below the moving plate, and its right end extends to the edge of the base plate, and its left end extends to the tail of the electric push rod. Thus, through the cooperation of the slide rail and the slider, the stability of the horizontal sliding of the moving plate is ensured. The vertical edge of the mounting plate is vertically fixedly connected to the upper surface of the horizontal edge of the moving plate near the end face. On the upper surface of the base plate, a limiting plate is vertically fixed at the left and right ends of each slide rail. The limiting plate limits the horizontal sliding of the mounting plate with the moving plate, thus ensuring that when the moving plate slides horizontally to the right limit position, the medium frequency induction heating component is completely located outside the base plate.

[0012] Preferably, the intermediate frequency induction heating assembly is disposed on the lower surface of the horizontal edge of the mounting plate near the end face, and includes an induction heating power supply, a water-cooled cable, an induction coil, a heating sleeve, a thermocouple, and a magnetic yoke; a reinforcing plate is also vertically disposed between the lower surface of the horizontal edge of the mounting plate and the inner surface of its vertical edge, and the mounting plate is supported and reinforced by the reinforcing plate; a hollow cylindrical heating sleeve is also vertically disposed on the right side of the lower surface of the horizontal edge of the mounting plate, the upper and lower surfaces of the heating sleeve being open, and its upper surface being fixedly connected to the lower surface of the horizontal edge of the mounting plate at a corresponding position. The lower surface extends vertically downwards to the lower surface of the horizontal edge of the moving plate, ensuring that the horizontal plane containing the lower surface of the heating jacket is above the horizontal plane containing the lower surface of the horizontal edge of the moving plate; the inner diameter of the heating jacket is larger than the outer diameter of the riser, and its wall thickness is 8mm, ensuring that its height matches the riser height; the heating jacket is made of a magnetically conductive material, and its melting point must be no lower than the melting point of the molten metal; the induction coil is made of a 19mm diameter, 2mm thick copper tube, and is spirally and coaxially spaced on the heating jacket; the height of the induction coil is less than the heating jacket height. The height of the sleeve is fixed, and its upper end is fixedly connected to the lower surface of the horizontal edge of the mounting plate at a corresponding position; the induction heating power supply is installed on the upper surface of the horizontal edge of the moving plate on the left side relative to the vertical edge of the mounting plate, and is connected to the induction coil through a water-cooled cable, ensuring that the water-cooled cable does not interfere with the horizontal sliding of the moving plate, thereby heating the riser by generating a thermal effect to achieve the riser feeding effect; a clearance hole coaxially set with the heating sleeve is also vertically embedded on the upper surface of the horizontal edge of the mounting plate, and the diameter of the clearance hole matches the inner diameter of the riser, and the clearance hole... To ensure that the medium-frequency induction heating assembly is coaxially fitted onto the riser, the addition of molten metal to the riser will not interfere with its operation. A magnetic yoke is also horizontally and coaxially fitted onto the lower end of the outer circumference of the heating sleeve. The yoke is made of stacked silicon steel sheets, and its outer diameter is larger than that of the induction coil, thus constraining the outward diffusion of leakage magnetic flux from the induction coil. A thermocouple is also provided on the inner circumference of the heating sleeve relative to the outside of the riser, and the thermocouple is electrically connected to the induction heating power supply. The thermocouple is used to monitor the temperature inside the heating sleeve, thereby controlling the heating temperature of the riser.

[0013] The feeding process of the medium-frequency heating feeding device for casting risers of the present invention is innovative in that it includes the following steps: Step 1: First, with manual assistance, move the base to the riser position using the casters; then, retract the piston rod of the hydraulic cylinder, causing the casters to lift, so that the outriggers contact the ground, ensuring the stability of the riser's feeding state; Step 2: Then, through the cooperation of the rotating component, the lifting component and the electric push rod, the medium frequency induction heating component is made to rotate horizontally, move vertically up and down and slide horizontally with the mounting plate, and be located coaxially above the riser. Step 3: Then, by vertically lowering the lifting assembly, the heating jacket is coaxially and spaced on the riser. At this time, the induction heating power supply is turned on, and induction heating is carried out through the cooperation of the induction coil and the heating jacket to preheat the riser. Step 4: Then pour the molten metal, and position the upper part of the molten metal inside the riser; at the same time, control the induction heating power supply to raise the temperature of the riser so that the temperature inside the heating jacket is higher than the casting temperature. Step 5: After pouring is completed, continue to apply power for induction heating to keep the temperature of the molten metal in the riser above the liquidus line, thereby ensuring that the molten metal in the riser can smoothly enter the casting for feeding and make the casting solidify sequentially. Step Six: Then, gradually cool down the casting by controlling the induction heating power supply. When the temperature of the top surface of the casting drops below the solidus temperature of the alloy, turn off the induction heating power supply.

[0014] The beneficial effects of this invention are: (1) The present invention can effectively reduce the cooling rate of the casting riser, ensuring that the molten metal in the riser can smoothly enter the casting, thereby ensuring the riser feeding effect and improving the product qualification rate; (2) The present invention facilitates the installation of the induction coil by means of horizontal rotation, vertical up and down movement and horizontal sliding through the combined use of the rotating component, the lifting component and the electric push rod. It is suitable for riser feeding operations at high positions, improves work efficiency and has a wide range of applications. (3) By using hydraulic cylinders, casters and outriggers in combination, the present invention can not only adapt to riser feeding operations in different positions by moving, but also facilitate the switching between moving state and feeding state, thereby ensuring the stability of riser feeding process. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a medium-frequency heating and feeding device for a casting riser according to the present invention.

[0017] Figure 2 This is a schematic diagram illustrating the usage state of the present invention.

[0018] Among them, 1-base; 2-hydraulic cylinder; 3-caster wheel; 4-outrigger; 5-side plate; 6-gear shaft; 7-main bevel gear; 8-driven bevel gear; 9-motor; 10-roller assembly; 11-rotating plate; 12-lifting assembly; 13-base plate; 14-electric push rod; 15-moving plate; 16-slide rail; 17-slider; 18-induction heating power supply; 19-mounting plate; 20-reinforcing plate; 21-induction coil; 22-heating sleeve; 23-avoidance hole; 24-magnetic yoke. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below through specific embodiments.

[0020] A medium-frequency heating feeding device for a casting riser according to the present invention includes a base 1, a rotating plate 11, a rotating assembly, a lifting assembly 12, a bottom plate 13, a moving assembly, a moving plate 15, a mounting plate 19, and a medium-frequency induction heating assembly; as shown. Figure 1 , Figure 2 As shown, the rotating plate 11 is a horizontally arranged circular plate, and is parallel to the upper surface of the horizontally arranged base 1. It is horizontally rotatably connected to the base 1 via a rotating assembly. The base plate 13 is horizontally parallel to the rotating plate 11 directly above it, and a lifting assembly 12 is provided between them. The lifting assembly 12 causes the base plate 13 to move vertically up and down on the rotating plate 11. A moving plate 15 is horizontally arranged on the right side of the upper surface of the base plate 13. The moving plate 15 moves horizontally back and forth on the upper surface of the base plate 13 via a moving assembly. An L-shaped mounting plate 19 is provided on the upper surface of the moving plate 15. The vertical edge of the mounting plate 19 is vertically fixed to the upper surface of the moving plate 15 near its right edge, and its horizontal edge extends horizontally out of the right side of the moving plate 15. A medium-frequency induction heating assembly matching the riser is provided on the lower surface of its horizontal edge. Then, through horizontal rotation, vertical up and down movement, and horizontal movement, the medium-frequency induction heating assembly is coaxially sleeved on the riser to perform riser feeding operation.

[0021] The base 1 of this invention is a horizontally arranged hollow cuboid structure, and hydraulic cylinders 2 are vertically and symmetrically arranged at the four right corners of its inner bottom surface, such as... Figure 1 , Figure 2 As shown, the four hydraulic cylinders 2 operate synchronously, and the piston rod of each hydraulic cylinder 2 extends vertically downward from the lower surface of the base 1 and is connected to the corresponding caster wheel 3. Support legs 4 are also vertically and symmetrically arranged at the four right angles of the lower surface of the base 1, and each support leg 4 is located within the square area enclosed by the four caster wheels 3. When in the upper limit position, the lower end face of each caster wheel 3 is located above the horizontal plane where the lower end of the corresponding support leg 4 is located. Driven by the hydraulic cylinders 2, this invention switches between a moving state and a riser-feeding state through the cooperation of the caster wheels 3 and the support legs 4.

[0022] The rotating assembly of this invention is configured to operate independently of the four hydraulic cylinders 2, and the rotating assembly includes a side plate 5, a gear shaft 6, a main bevel gear 7, a driven bevel gear 8, a motor 9, and a roller assembly 10; as shown Figure 1 , Figure 2 As shown, a gear shaft 6 is vertically positioned in the middle of the interior of the base 1. The lower end of the gear shaft 6 is rotatably connected to the inner bottom surface of the base 1, and its upper end extends vertically upward beyond the upper surface of the base 1, and is coaxially fixedly connected to the middle of the lower surface of the rotating plate 11. A driven bevel gear 8 is horizontally and coaxially sleeved and fixed on the gear shaft 6 relative to the interior of the base 1, and the driven bevel gear 8 and the base 1 are not interfered with each other. A matching side plate 5 is vertically positioned in the interior of the base 1 relative to the right side of the driven bevel gear 8, and a motor 9 is horizontally positioned in the interior of the base 1 between the driven bevel gear 8 and the side plate 5. The fixed end of the motor 9 is screwed to the left side of the side plate 5, and its output end is horizontally positioned facing the left, and is connected to the driven bevel gear 8 through the meshing of the main bevel gear 7. Under the drive of the motor 9, the gear shaft 6 rotates around its own axis through the meshing of the main bevel gear 7 and the driven bevel gear 8, thereby driving the rotating plate 11 to rotate horizontally.

[0023] like Figure 1 , Figure 2 As shown, a number of roller sets 10 are connected to the upper surface of the base 1 and abut against the lower surface of the rotating plate 11. The roller sets 10 are coaxially arranged with the rotating plate 11 and are arranged without interfering with the gear shaft 6. Each roller set 10 is conical, with the end near the gear shaft 6 being the small end and the other end being the large end, so as to accommodate the smaller linear velocity near the gear shaft 6 when the rotating plate 11 rotates.

[0024] like Figure 1 , Figure 2 As shown, the base plate 13 is a circular structure that matches the rotating plate 11, and is vertically aligned with the rotating plate 11, ensuring that the lifting assembly 12 is within the vertical coverage area of ​​the base plate 13. This allows the base plate 13 to move vertically up and down via the lifting assembly 12, and to rotate horizontally synchronously with the rotating plate 11 and move horizontally synchronously with the base 1. The lifting assembly 12 of this invention can be an existing lifting platform, which is conventional equipment; therefore, its structure and working principle will not be described in detail here.

[0025] The moving component of this invention includes an electric push rod 14, a stiffening plate, a slide rail 16, a slider 17, and a limiting plate; as shown... Figure 1 , Figure 2As shown, the movable plate 15 has an L-shaped structure, with its vertical edge vertically positioned on the upper surface of the base plate 13 near the center, and its horizontal edge horizontally facing to the right. On the upper surface of the base plate 13, relative to the left side of the movable plate 15, an electric push rod 14 is horizontally positioned. The tail of the electric push rod 14 is fixedly mounted on the corresponding position on the upper surface of the base plate 13 via a rib, and its pushing end is horizontally positioned to the right and screwed to the outer surface of the vertical edge of the movable plate 15, thereby pushing the movable plate 15 to slide horizontally back and forth on the upper surface of the base plate 13. On the lower surface of the horizontal edge of the movable plate 15, horizontally positioned sliders 17 are symmetrically arranged at intervals. The right end of each slider 17 is flush with the end face of the horizontal edge of the movable plate 15, and its left end extends to the position near the vertical edge of the movable plate 15. On the upper surface of the base plate 13, relative to the left side of the movable plate 15... Each slider 17 is also provided with a horizontally matching slide rail 16. Each slide rail 16 passes through the area directly below the moving plate 15, and its right end extends to the edge of the base plate 13, and its left end extends to the tail of the electric push rod 14. Thus, the cooperation between the slide rail 16 and the slider 17 ensures the stability of the horizontal sliding of the moving plate 15. The vertical edge of the mounting plate 19 is vertically fixed to the upper surface of the horizontal edge of the moving plate 15 near the end face. On the upper surface of the base plate 13, a limiting plate is also vertically fixed at the left and right ends of each slide rail 16. The limiting plate limits the horizontal sliding of the mounting plate 19 with the moving plate 15, thus ensuring that when the moving plate 15 slides horizontally to the right limit position, the medium frequency induction heating component is completely located outside the base plate 13.

[0026] The medium-frequency induction heating assembly of this invention is disposed on the lower surface of the horizontal edge of the mounting plate 19 near the end face, and includes an induction heating power supply 18, a water-cooled cable, an induction coil 21, a heating sleeve 22, a thermocouple, and a magnetic yoke 24; as shown Figure 1 , Figure 2 As shown, a reinforcing plate 20 is vertically provided between the lower surface of the horizontal side of the mounting plate 19 and the inner surface of its vertical side, and the mounting plate 19 is supported and reinforced by the reinforcing plate 20; a hollow cylindrical heating sleeve 22 is vertically provided on the right side of the lower surface of the horizontal side of the mounting plate 19. The upper and lower surfaces of the heating sleeve 22 are open, and its upper surface is fixedly connected to the lower surface of the horizontal side of the mounting plate 19 at the corresponding position. Its lower surface extends vertically downward to the lower surface of the horizontal side of the moving plate 15, and ensures that the horizontal plane of the lower surface of the heating sleeve 22 is above the horizontal plane of the lower surface of the horizontal side of the moving plate 15; the inner diameter of the heating sleeve 22 is larger than the outer diameter of the riser, and its wall thickness is 8mm, and its height is matched with the riser height. The heating sleeve 22 is made of magnetic material, and its melting point must be ensured to be not lower than the melting point of the molten metal. like Figure 1 , Figure 2As shown, the induction coil 21 is made of a copper tube with a diameter of 19mm and a wall thickness of 2mm, and is spirally and coaxially spaced on the heating sleeve 22. The height of the induction coil 21 is less than the height of the heating sleeve 22, and its upper end is fixedly connected to the lower surface of the horizontal side of the mounting plate 19. The induction heating power supply 18 is installed on the upper surface of the horizontal side of the moving plate 15 on the left side relative to the vertical side of the mounting plate 19, and is connected to the induction coil 21 through a water-cooled cable. It is ensured that the water-cooled cable does not interfere with the horizontal sliding of the moving plate 15, thereby generating a thermal effect to heat the riser and achieve the riser compression effect. A vertically embedded part coaxially with the heating sleeve 22 is also provided on the upper surface of the horizontal side of the mounting plate 19. The heating sleeve 22 has a clearance hole 23, the diameter of which matches the inner diameter of the riser. The clearance hole 23 ensures that when the medium-frequency induction heating assembly is coaxially fitted onto the riser, it does not interfere with the addition of molten metal to the riser. A magnetic yoke 24 is horizontally and coaxially fitted onto the lower end of the outer circumference of the heating sleeve 22. The magnetic yoke 24 is made of stacked silicon steel sheets, and its outer diameter is larger than that of the induction coil 21. This magnetic yoke 24 constrains the outward diffusion of leakage magnetic flux from the induction coil 21. A thermocouple is also provided on the inner circumference of the heating sleeve 22 relative to the outside of the riser. The thermocouple is electrically connected to the induction heating power supply 18, thereby monitoring the temperature inside the heating sleeve 22 to control the heating temperature of the riser. The water-cooled cable and thermocouple of this invention are not shown in the figures, but their working principle and usage are existing technologies. Those skilled in the art can install and set up the water-cooled cable and thermocouple according to existing technologies; therefore, their connection and working principle will not be described in detail here.

[0027] The feeding process of the medium-frequency heating feeding device for casting risers according to the present invention, such as... Figure 1 , Figure 2 As shown, it includes the following steps: Step 1: First, with human assistance, move the base 1 to the riser position using the casters 3; then, retract the piston rod of the hydraulic cylinder 2, causing the casters 3 to lift, so that the outrigger 4 contacts the ground, ensuring the stability of the riser's feeding state.

[0028] Step 2: Then, through the cooperation of the rotating component, the lifting component 12 and the electric push rod 14, the medium frequency induction heating component is made to rotate horizontally, move vertically up and down and slide horizontally with the mounting plate 19, and be located directly above the riser at a coaxial interval.

[0029] Step 3: Then, by vertically lowering the lifting assembly 12, the heating sleeve 22 is coaxially spaced and fitted onto the riser. At this time, the induction heating power supply 18 is turned on, and induction heating is performed through the cooperation of the induction coil 21 and the heating sleeve 22 to preheat the riser.

[0030] Step 4: Then pour the molten metal and position the upper part of the molten metal inside the riser; at the same time, control the induction heating power supply 18 to raise the temperature of the riser so that the temperature inside the heating jacket 22 is higher than the casting temperature.

[0031] Step 5: After pouring is completed, continue to apply electricity for induction heating to keep the temperature of the molten metal in the riser above the liquidus line, thereby ensuring that the molten metal in the riser can smoothly enter the casting for feeding and make the casting solidify sequentially.

[0032] Step Six: Then, gradually cool down the casting by controlling the induction heating power supply 18. When the temperature of the top surface of the casting drops below the solidus temperature of the alloy, turn off the induction heating power supply 18.

[0033] The beneficial effects of this invention are: (1) The present invention can effectively reduce the cooling rate of the casting riser, ensuring that the molten metal in the riser can smoothly enter the casting, thereby ensuring the riser feeding effect and improving the product qualification rate; (2) The present invention facilitates the installation of the induction coil 21 by means of the cooperation of the rotating component, the lifting component 12 and the electric push rod 14, which is suitable for the riser feeding operation at high position, improves the work efficiency and has a wide range of applications. (3) By using the hydraulic cylinder 2, the universal wheel 3 and the outrigger 4 together, the present invention can not only adapt to the riser feeding operation in different positions by moving, but also facilitate the switching between moving state and feeding state, thereby ensuring the stability of the riser feeding process.

[0034] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, all modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the technical requirements.

Claims

1. A medium-frequency heating feeding device for casting risers, characterized in that: The system includes a base, a rotating plate, a rotating assembly, a lifting assembly, a bottom plate, a moving assembly, a moving plate, a mounting plate, and a medium-frequency induction heating assembly. The rotating plate is a horizontally arranged circular plate, parallel to each other on the upper surface of the horizontally arranged base, and is horizontally rotatably connected to the base via the rotating assembly. The bottom plate is horizontally parallel to each other directly above the rotating plate, and a lifting assembly is provided between them, which allows the bottom plate to move vertically up and down on the rotating plate. A moving plate is horizontally arranged on the right side of the upper surface of the bottom plate, and the moving plate moves horizontally back and forth on the upper surface of the bottom plate via the moving assembly. An L-shaped mounting plate is provided on the upper surface of the moving plate, with its vertical edge vertically fixed to the right edge of the upper surface of the moving plate, and its horizontal edge extending horizontally out of the right side of the moving plate. A medium-frequency induction heating assembly matching the riser is provided on the lower surface of its horizontal edge. Through horizontal rotation, vertical up and down movement, and horizontal movement, the medium-frequency induction heating assembly is coaxially fitted onto the riser for riser feeding operation.

2. The medium-frequency heating feeding device for casting risers according to claim 1, characterized in that: It also includes hydraulic cylinders, casters, and outriggers; the base is a horizontally arranged hollow cuboid structure, and hydraulic cylinders are vertically and symmetrically arranged at the four right angles of its inner bottom surface. The four hydraulic cylinders move synchronously, and the piston rod of each hydraulic cylinder extends vertically downward from the lower surface of the base and is connected to the corresponding caster; outriggers are vertically and symmetrically arranged at the four right angles of the lower surface of the base, and each outrigger is located within a square area enclosed by the four casters; when in the upper limit position, the lower end of each caster is located above the horizontal plane where the lower end of the corresponding outrigger is located, and under the drive of the hydraulic cylinders, the movement state and the riser feeding state are switched through the cooperation of the casters and outriggers.

3. The medium-frequency heating feeding device for casting risers according to claim 2, characterized in that: The rotating assembly is configured to operate independently of the four hydraulic cylinders. The rotating assembly includes a side plate, a gear shaft, a main bevel gear, a driven bevel gear, and a motor. A gear shaft is vertically positioned in the center of the base, with its lower end rotatably connected to the inner bottom surface of the base and its upper end extending vertically upwards from the upper surface of the base, coaxially fixed to the center of the lower surface of the rotating plate. A driven bevel gear is horizontally and coaxially fitted onto the gear shaft relative to the interior of the base, and this driven bevel gear operates independently of the base. A matching side plate is vertically positioned to the right of the driven bevel gear within the base. A motor is horizontally positioned between the driven bevel gear and the side plate within the base. The fixed end of the motor is screwed to the left side of the side plate, and its output end is horizontally positioned to the left. The motor meshes with the driven bevel gear via the main bevel gear. Driven by the motor, the gear shaft rotates around its own axis through the meshing of the main and driven bevel gears, causing the rotating plate to rotate horizontally.

4. The medium-frequency heating feeding device for casting risers according to claim 3, characterized in that: It also includes a roller assembly; several roller assemblies are connected to the upper surface of the base and abut against the lower surface of the rotating plate, and the roller assemblies are coaxially arranged with the rotating plate and are respectively arranged without interfering with the gear shaft; each roller assembly is conical, with one end near the gear shaft being the small end and the other end being the large end, so as to accommodate a smaller linear velocity near the gear shaft when the rotating plate rotates.

5. A medium-frequency heating feeding device for casting risers according to claim 3, characterized in that: The base plate is a circular structure that matches the rotating plate and is aligned vertically with the rotating plate, ensuring that the lifting assembly is within the vertical coverage area of ​​the base plate. This allows the base plate to move vertically up and down via the lifting assembly, rotate horizontally synchronously with the rotating plate, and move horizontally synchronously with the base.

6. The medium-frequency heating feeding device for casting risers according to claim 3, characterized in that: The moving assembly includes an electric push rod, a stiffening plate, a slide rail, a slider, and a limiting plate. The moving plate has an L-shaped structure, with its vertical side vertically arranged on the upper surface of the base plate near the center, and its horizontal side horizontally arranged to the right. An electric push rod is also horizontally arranged on the upper surface of the base plate relative to the left side of the moving plate. The tail of the electric push rod is fixedly installed on the corresponding position on the upper surface of the base plate by the stiffening plate, and its pushing end is horizontally arranged to the right and screwed to the outer surface of the vertical side of the moving plate, thereby pushing the moving plate to perform horizontal reciprocating sliding on the upper surface of the base plate. A horizontally arranged slider is also symmetrically arranged at intervals on the lower surface of the horizontal side of the moving plate. The right end of each slider is flush with the end face of the horizontal side of the moving plate, and its left end extends to the side of the moving plate. At the vertical edge position; on the upper surface of the base plate, a horizontal slide rail matching the slider is also provided relative to each slider position. Each slide rail passes through the area directly below the moving plate, and its right end extends to the edge of the base plate, and its left end extends to the tail of the electric push rod. Thus, through the cooperation of the slide rail and the slider, the stability of the horizontal sliding of the moving plate is ensured. The vertical edge of the mounting plate is vertically fixedly connected to the upper surface of the horizontal edge of the moving plate near the end face. On the upper surface of the base plate, a limiting plate is vertically fixed at the left and right ends of each slide rail. The limiting plate limits the horizontal sliding of the mounting plate with the moving plate, thus ensuring that when the moving plate slides horizontally to the right limit position, the medium frequency induction heating component is completely located outside the base plate.

7. A medium-frequency heating feeding device for casting risers according to claim 6, characterized in that: The intermediate frequency induction heating assembly is disposed on the lower surface of the horizontal edge of the mounting plate near the end face, and includes an induction heating power supply, a water-cooled cable, an induction coil, a heating sleeve, a thermocouple, and a magnetic yoke. A reinforcing plate is vertically disposed between the lower surface of the horizontal edge of the mounting plate and the inner surface of its vertical edge, providing support and reinforcement for the mounting plate. A hollow cylindrical heating sleeve is vertically disposed on the right side of the lower surface of the horizontal edge of the mounting plate. Both the upper and lower surfaces of the heating sleeve are open, with its upper surface fixedly connected to the corresponding position of the lower surface of the horizontal edge of the mounting plate, and its lower surface... The heating sleeve extends vertically downwards to the lower surface of the horizontal edge of the moving plate, ensuring that the horizontal plane of the lower surface of the heating sleeve is above the horizontal plane of the lower surface of the horizontal edge of the moving plate; the inner diameter of the heating sleeve is larger than the outer diameter of the riser, and its wall thickness is 8mm, ensuring that its height matches the riser height; the heating sleeve is made of a magnetically conductive material, and its melting point must be no lower than the melting point of the molten metal; the induction coil is made of a 19mm diameter, 2mm thick copper tube, and is spirally and coaxially spaced on the heating sleeve; the height of the induction coil is less than that of the heating sleeve. The height is such that its upper end is fixedly connected to the lower surface of the horizontal edge of the mounting plate at a position corresponding to the horizontal edge of the mounting plate; the induction heating power supply is installed on the upper surface of the horizontal edge of the moving plate to the left of the vertical edge of the mounting plate, and is connected to the induction coil through a water-cooled cable, ensuring that the water-cooled cable does not interfere with the horizontal sliding of the moving plate, thereby heating the riser by generating a thermal effect to achieve the riser feeding effect; a clearance hole coaxially set with the heating sleeve is also vertically embedded on the upper surface of the horizontal edge of the mounting plate, and the diameter of the clearance hole matches the inner diameter of the riser, and the clearance hole ensures that the riser feeds the riser. When the medium-frequency induction heating component is coaxially fitted onto the riser, it does not interfere with the addition of molten metal to the riser. A magnetic yoke is also horizontally and coaxially fitted on the lower end of the outer circumference of the heating sleeve. The magnetic yoke is made of stacked silicon steel sheets, and its outer diameter is larger than that of the induction coil. This magnetic yoke constrains the leakage magnetic flux of the induction coil to diffuse outward. A thermocouple is also provided on the inner circumference of the heating sleeve relative to the outside of the riser. The thermocouple is electrically connected to the induction heating power supply. The temperature inside the heating sleeve is monitored through the thermocouple to control the heating temperature of the riser.

8. The feeding process of the medium-frequency heating feeding device for casting risers according to claim 7, characterized in that... Includes the following steps: Step 1: First, with manual assistance, move the base to the riser position using the casters; then, retract the piston rod of the hydraulic cylinder, causing the casters to lift, so that the outriggers contact the ground, ensuring the stability of the riser's feeding state; Step 2: Then, through the cooperation of the rotating component, the lifting component and the electric push rod, the medium frequency induction heating component is made to rotate horizontally, move vertically up and down and slide horizontally with the mounting plate, and be located coaxially above the riser. Step 3: Then, by vertically lowering the lifting assembly, the heating jacket is coaxially and spaced on the riser. At this time, the induction heating power supply is turned on, and induction heating is carried out through the cooperation of the induction coil and the heating jacket to preheat the riser. Step 4: Then pour the molten metal, and position the upper part of the molten metal inside the riser; at the same time, control the induction heating power supply to raise the temperature of the riser so that the temperature inside the heating jacket is higher than the casting temperature. Step 5: After pouring is completed, continue to apply power for induction heating to keep the temperature of the molten metal in the riser above the liquidus line, thereby ensuring that the molten metal in the riser can smoothly enter the casting for feeding and make the casting solidify sequentially. Step Six: Then, gradually cool down the casting by controlling the induction heating power supply. When the temperature of the top surface of the casting drops below the solidus temperature of the alloy, turn off the induction heating power supply.

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