Recycling and smelting device for waste cast iron scraps of nodular iron castings

Abstract

The utility model discloses a nodular iron casting waste cast iron scrap recycling and smelting device, and relates to the technical field of cast iron, the nodular iron casting waste cast iron scrap recycling and smelting device specifically comprises a smelting structure and a heat recycling structure, the smelting structure comprises a smelting area, a feeding area and an electromagnetic induction heater, the feeding area is fixed to the top of the smelting area, and a feeding pipe is arranged at the top of an inner cavity of the feeding area; the electromagnetic induction heater comprises an electromagnetic heating main body and an electromagnetic heating coil matched with the electromagnetic heating main body, the electromagnetic heating coil is fixedly connected with the inner wall of the smelting area, and a charging barrel is fixed in an inner cavity of the smelting area and located in an inner cavity of the electromagnetic heating coil; and the bottom end of the inner cavity of the charging barrel is fixedly connected with a filter screen. According to the recycling and smelting device for the scrap iron scraps of the nodular iron casting, the scrap iron scraps are heated in a non-contact electromagnetic induction heating mode, the temperature rising speed of the scrap iron scraps is increased, no heating dead angle exists in the smelting area, the scrap iron scraps in the smelting area can be synchronously and evenly heated, and the smelting efficiency and smelting quality of the scrap iron scraps are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of cast iron, in particular to a waste cast iron chip recycling and melting device for ductile iron castings. Background Technique

[0002] Ductile iron castings are a kind of high-strength cast iron material developed in the 1950s of the 20th century. Its comprehensive performance is close to that of steel. Based on its excellent performance, it has been successfully used to cast some parts with complex forces, high requirements for strength, toughness and wear resistance. During the manufacturing process of ductile iron castings, many waste iron chips will be generated. At this time, a melting device is needed to melt the recycled iron chips.

[0003] Some solutions for waste cast iron chip recycling and melting devices for ductile iron castings are disclosed in the prior art. For example, a waste cast iron chip recycling and melting device for ductile iron castings disclosed in the authorized patent with the application number CN202122199349.0 includes a melting barrel, electric heating wires, a discharge pipe and a plurality of legs. The electric heating wires are fixedly connected inside the melting barrel. The discharge pipe is communicated with the bottom of the melting barrel. The plurality of legs are fixedly connected to the bottom of the legs. A gantry is fixedly connected to the top of the melting barrel and other components.

[0004] When the above solution is used, the iron chips are heated by electric heating wires, that is, this solution uses a contact transfer heating method to melt the iron chips. This type of solution has common defects when used: the iron chips have a slow heating rate, and the iron chips close to the heat sources such as electric heating wires have a faster heating rate than the iron chips far from the heat sources, affecting the melting efficiency and quality of the iron chips; it is necessary to consume some heat to heat the barrel, with low energy utilization rate, and inertial phenomena occur during both heating and cooling. Moreover, when replenishing water to the water storage cavity in the above solution, due to the large temperature difference between the replenished water and the original water in the water storage cavity, the temperature of the water in the water storage cavity will drop significantly after replenishment, reducing the steam generation speed. Based on this, the present application proposes a waste cast iron chip recycling and melting device for ductile iron castings. Summary of the Utility Model

[0005] The utility model provides a waste cast iron chip recycling and melting device for ductile iron castings, which solves the problems of slow heating rate of iron chips, different heating rates at different positions in the barrel, affecting the melting efficiency and quality of iron chips; consuming some heat to heat the barrel, with low energy utilization rate, and inertial phenomena occurring during both heating and cooling; when replenishing water to the water storage cavity, the temperature of the water in the water storage cavity drops significantly, reducing the steam generation speed as mentioned in the above background technique.

[0006] The utility model provides the following technical solution: A waste cast iron chip recycling and melting device for ductile iron castings, comprising a melting structure and a heat recovery structure. The melting structure includes a melting area, a feeding area fixed to the top of the melting area, and an electromagnetic induction heater. A feeding pipe is provided at the top of the inner cavity of the feeding area. The electromagnetic induction heater includes an electromagnetic heating main body and an electromagnetic heating coil adapted to the electromagnetic heating main body. The electromagnetic heating coil is fixedly connected to the inner wall of the melting area. A material cylinder is fixed inside the inner cavity of the melting area. The material cylinder is located inside the inner cavity of the electromagnetic heating coil. A filter screen is fixedly connected to the bottom end of the inner cavity of the material cylinder. A discharge pipe is fixed to the bottom of the material cylinder;

[0007] The heat recovery structure includes a first heat insulation cylinder fixed to the melting area and an exhaust fan. A heat exchange box is fixed inside the inner cavity of the first heat insulation cylinder. Partition plates are uniformly and fixedly connected inside the inner cavity of the heat exchange box from top to bottom. The partition plates divide the inner cavity of the heat exchange box into different recovery cavities. A water supply pipe is provided on one side of the top end of the recovery cavity located above. Steam discharge pipes are provided on one side of the top ends of the remaining recovery cavities. Electric ball valves are uniformly provided on the partition plates. An air inlet pipe is fixed to the air inlet end of the exhaust fan. The other end of the air inlet pipe extends to the top end of the inner cavity of the feeding area. An air outlet pipe is fixed to the air outlet end of the exhaust fan. The other end of the air outlet pipe extends to the bottom end of the inner cavity of the first heat insulation cylinder, and the air outlet pipe is located below the heat exchange box. An exhaust pipe is provided at the top of the inner cavity of the first heat insulation cylinder.

[0008] Preferably, a second heat insulation cylinder is fixed to the inner wall of the material cylinder. The inner diameter of the second heat insulation cylinder is the same as the inner diameter of the feeding area. The bottom of the inner cavity of the material cylinder is inclined. The discharge pipe is located at the bottom end of the bottom of the inner cavity of the material cylinder.

[0009] Preferably, the heat exchange box is circular ring-shaped. Fixing blocks are uniformly fixed to the side wall of the heat exchange box. The heat exchange box is fixedly connected to the inner wall of the first heat insulation cylinder through the fixing blocks.

[0010] Preferably, a ball valve is provided at one end of the water supply pipe. Heat insulation pads are wrapped on the outer surfaces of the steam discharge pipe, the air inlet pipe, and the air outlet pipe.

[0011] Preferably, an isolation net is fixed to the end of the air inlet pipe away from the exhaust fan.

[0012] Preferably, water level gauges are provided in both the upper recovery cavity and the lower recovery cavity.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The waste cast iron chip recycling and melting device for ductile iron castings uses a non-contact electromagnetic induction heating method to heat the iron chips, which can improve the heating speed of the iron chips and ensure that there is no heating dead angle in the melting area. The iron chips in the melting area can be heated uniformly synchronously, guaranteeing the melting efficiency and quality of the iron chips.

[0015] 2. The waste cast iron chip recycling and melting device for ductile iron castings, through the setting of a heat recovery structure, can recover the heat in the gas generated during the iron chip melting process, improve the energy utilization rate, reduce the temperature difference between the supplementary heat exchange liquid and the cavity wall of the recovery chamber, avoid cracks in the heat exchange box due to excessive temperature difference changes, extend the service life of the heat exchange box, and increase the steam generation speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a front schematic view of the structure of the present utility model;

[0017] Figure 2 is the structure of the present utility model Figure 1 back schematic view;

[0018] Figure 3 is the structure of the present utility model Figure 1 bottom schematic view;

[0019] Figure 4 is a sectional schematic view of the melting area of the structure of the present utility model;

[0020] Figure 5 is an internal schematic view of the heat recovery structure of the structure of the present utility model;

[0021] Figure 6 is a sectional schematic view of the heat exchange box of the structure of the present utility model.

[0022] In the figure: 1. Melting area; 2. Feeding area; 3. Electromagnetic heating main body; 4. Electromagnetic heating coil; 5. Feeding pipe; 6. First heat insulation cylinder; 7. Exhaust pipe; 8. Exhaust fan; 9. Steam discharge pipe; 10. Water supply pipe; 11. Air inlet pipe; 12. Discharge pipe; 13. Second heat insulation cylinder; 14. Barrel; 15. Filter screen; 16. Heat exchange box; 17. Partition board; 18. Electric ball valve; 19. Fixed block; 20. Water level gauge. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] The utility model provides a waste cast iron chip recycling and melting device for ductile iron castings, which includes a melting structure and a heat recovery structure. The melting structure includes a melting area 1, a feeding area 2 and an electromagnetic induction heater. The electromagnetic induction heater includes an electromagnetic heating main body 3 and an electromagnetic heating coil 4 adapted to the electromagnetic heating main body 3. The working principle of the electromagnetic induction heater is prior art and will not be elaborated here. In some embodiments of the present application, the model of the electromagnetic induction heater is ZJ20X-1. The above-mentioned electromagnetic heating coil 4 is fixed to the inner wall of the melting area 1. A material cylinder 14 is fixedly connected inside the cavity of the melting area 1. The material cylinder 14 is located inside the cavity of the electromagnetic heating coil 4, and a first heat insulation cylinder 6 is fixed to the inner wall of the material cylinder 14. Through the setting of the electromagnetic heater, when the melting device melts waste cast iron chips of ductile iron castings, the iron chips are heated by a non-contact electromagnetic induction heating method. The iron chips located in the melting area 1 can be evenly heated, there is no heating dead angle in the material cylinder 14, and the inertial phenomenon of heating can be eliminated. The iron chips have a high heating rate, improving the melting efficiency and quality of the iron chips.

[0025] The bottom of the inner cavity of the material cylinder 14 is inclined, and a discharge pipe 12 is fixed to the bottom of the material cylinder 14. The discharge pipe 12 is located at the bottom end of the inner cavity bottom of the material cylinder 14. Such a setting facilitates the discharge of the melted iron water.

[0026] A filter screen 15 is fixedly connected to the bottom end of the inner cavity of the material cylinder 14. Through the setting of the filter screen 15, the filter screen 15 can intercept the iron chips, avoiding the un-melted iron chips from being discharged through the discharge pipe 12. The iron water formed after the iron chips are melted can pass through the filter screen 15 and be discharged through the discharge pipe 12.

[0027] In some embodiments of the present application, the material of the first heat insulation cylinder 6 is rock wool, and the materials of both the material cylinder 14 and the filter screen 15 are ceramics.

[0028] The feeding area 2 is fixed to the top of the melting area 1. The inner diameter of the inner wall of the feeding area 2 and the second heat insulation cylinder 13 is the same as the inner diameter of the feeding area 2. In the middle of the top of the inner cavity of the feeding area 2, there is a feeding pipe 5. By using the feeding pipe 5, the iron chips to be recycled and melted can enter the feeding area 2 through the feeding pipe 5. The iron chips in the feeding area 2 can enter the melting area 1 under the action of gravity for melting.

[0029] The heat recovery structure includes the first heat insulation cylinder 6 fixed to the melting area 1 and an air extractor 8. The air inlet end of the air extractor 8 is fixed with an air inlet pipe 11. The other end of the air inlet pipe 11 extends to the top end of the inner cavity of the feeding area 2. The air outlet end of the air extractor 8 is fixed with an air outlet pipe, and the other end of the air outlet pipe extends to the bottom end of the inner cavity of the first heat insulation cylinder 6. Through the setting of the air extractor 8, the work of the air extractor 8 can pump the gas generated during the iron chip melting process into the inner cavity of the first heat insulation cylinder 6. And a separation net is fixed to the end of the air inlet pipe 11 away from the air extractor 8. The separation net can intercept the iron chips to avoid the iron chips from entering the air inlet pipe 11.

[0030] The outer surfaces of both the air inlet pipe 11 and the air outlet pipe are wrapped with heat insulation pads, and the material of the heat insulation pads can be EPE. Through the setting of the heat insulation pads, the heat loss during gas transfer can be reduced.

[0031] A heat exchange box 16 is fixed inside the inner cavity of the first heat insulation cylinder 6. The heat exchange box 16 is circular ring-shaped. Fixing blocks 19 are evenly fixed on the side wall of the heat exchange box 16. The heat exchange box 16 is fixedly connected to the inner wall of the first heat insulation cylinder 6 through the fixing blocks 19. And there are gas flow gaps between the outer side wall, the top and the bottom of the heat exchange box 16 and the inner wall of the first heat insulation cylinder 6. The size of the gas flow gaps is designed according to requirements and will not be elaborated here. Through the setting of the heat exchange box 16, the gas pumped into the first heat insulation cylinder 6 can contact the outer side wall and the inner side wall of the heat exchange box 16, which is convenient for the recovery of heat in the gas.

[0032] Partition plates 17 are evenly fixedly connected from top to bottom inside the inner cavity of the heat exchange box 16. The partition plates 17 divide the inner cavity of the heat exchange box 16 into different recovery cavities. A water supply pipe 10 is provided on one side of the top end of the recovery cavity located above. A ball valve is provided at one end of the water supply pipe 10. Steam discharge pipes 9 are provided on one side of the top ends of the remaining recovery cavities. And electric ball valves 18 are evenly provided on the partition plates 17.

[0033] Through the setting of the heat exchange box 16, the gas generated during the iron filings melting process can exchange heat with the heat exchange liquid in the heat exchange box 16. The steam generated by the heat exchange liquid can be discharged through the steam discharge pipes 9. The heat exchange liquid can be replenished into the heat exchange box 16 by using the water supply pipe 10. In some embodiments of the present application, the heat exchange liquid is water. Through the setting of the electric ball valves 18, when the electric ball valves 18 are in the open state, the two adjacent recovery cavities can be in a communicating state, which is convenient for replenishing the heat exchange liquid into the recovery cavity located below. When the electric ball valves 18 are in the closed state, the two adjacent recovery cavities are in a mutually independent state, which is convenient for the heat exchange liquid in each recovery cavity to exchange heat with the gas.

[0034] Water level gauges 20 are provided both in the recovery cavity located above and in the recovery cavity located below. Through the setting of the water level gauges 20, the water level gauges 20 can detect the water volume in the recovery cavities, which is convenient for timely replenishing and changing water in the heat exchange box. And when the water level gauge 20 in the recovery cavity located below detects that water needs to be replenished, the electric ball valves 18 on the partition plates 17 from bottom to top are sequentially in the open state. Under the action of gravity, the heat exchange liquid can move into the adjacent recovery cavity, reducing the temperature difference between the heat exchange liquid and the wall of the recovery cavity, prolonging the service life of the wall of the recovery cavity, and increasing the speed of generating steam by the heat exchange liquid.

[0035] The outer surface of the steam discharge pipe 9 is wrapped with a heat insulation pad. The heat insulation pad can be used to reduce the heat loss during the transportation of the heat exchange steam.

[0036] All the electrical components involved in this application are prior arts. Those skilled in the art understand their connection methods. Through those skilled in the art, all the electrical components in this application are connected to their adapted power supplies through wires, and a suitable controller is selected according to the actual situation to meet the control requirements. For the specific connection and control sequence, please refer to the following description. The electrical components are electrically connected in the order of their sequential operations. The detailed connection means are well-known technologies in the art. The following mainly introduces the working principle and process, and no further description of electrical control will be made.

[0037] In summary, when the ductile iron casting waste iron filings recycling and melting device is in use, the ductile iron casting waste iron filings to be melted enter the feeding area 2 through the feeding pipe 5. The iron filings in the feeding area 2 enter the melting area 1 under the action of gravity. The iron filings in the melting area 1 are uniformly heated by electromagnetic induction heating. The molten iron generated by the melting of the iron filings passes through the filter screen 15 and is discharged through the discharge pipe 12. The gas generated during the melting process of the iron filings is blown into the inner cavity of the first heat insulation cylinder 6 under the action of the exhaust fan 8. During the movement of the gas in the first heat insulation cylinder 6, it contacts both the outer wall and the inner wall of the heat exchange box 16. The gas exchanges heat with the heat exchange liquid in the heat exchange box 16 to realize the recovery of the heat in the gas. The cooled gas is discharged through the exhaust pipe 7. The heat exchange steam generated during the heat exchange process is discharged through the steam discharge pipe 9. When the recovery cavity below the heat exchange box 16 needs to be replenished with heat exchange liquid, the electric ball valves 18 in the partition plates 17 from bottom to top are sequentially in the open state, so that the heat exchange liquid enters the adjacent recovery cavity under the action of gravity, and finally the upper recovery cavity is replenished with heat exchange liquid through the water replenishing pipe 10 to improve the steam generation speed.

[0038] All the standard parts used in the present utility model can 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, which 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. Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A waste cast iron chip recycling and melting device for ductile iron castings, comprising a melting structure and a heat recovery structure, characterized in that: The smelting structure includes a smelting area (1), a feeding area (2) fixed to the top of the smelting area (1), and an electromagnetic induction heater. A feeding pipe (5) is provided at the top of the inner cavity of the feeding area (2). The electromagnetic induction heater includes an electromagnetic heating main body (3) and an electromagnetic heating coil (4) adapted to the electromagnetic heating main body (3). The electromagnetic heating coil (4) is fixedly connected to the inner wall of the smelting area (1). A material cylinder (14) is fixed in the inner cavity of the smelting area (1). The material cylinder (14) is located in the inner cavity of the electromagnetic heating coil (4). A filter screen (15) is fixedly connected to the bottom end of the inner cavity of the material cylinder (14). A discharge pipe (12) is fixed to the bottom of the material cylinder (14). The heat recovery structure includes a first heat insulation cylinder (6) fixed to the smelting area (1) and a suction fan (8). A heat exchange box (16) is fixed in the inner cavity of the first heat insulation cylinder (6). Partition plates (17) are fixedly connected in the inner cavity of the heat exchange box (16) from top to bottom at equal intervals. The partition plates (17) divide the inner cavity of the heat exchange box (16) into different recovery cavities. A water supply pipe (10) is provided on one side of the top end of the recovery cavity located above. Steam discharge pipes (9) are provided on one side of the top ends of the remaining recovery cavities. Electric ball valves (18) are evenly provided on the partition plates (17). An air inlet pipe (11) is fixed to the air inlet end of the suction fan (8). The other end of the air inlet pipe (11) extends to the top end of the inner cavity of the feeding area (2). An air outlet pipe is fixed to the air outlet end of the suction fan (8). The other end of the air outlet pipe extends to the bottom end of the inner cavity of the first heat insulation cylinder (6), and the air outlet pipe is located below the heat exchange box (16). An exhaust pipe (7) is provided at the top of the inner cavity of the first heat insulation cylinder (6).

2. The waste cast iron chips recycling and melting device for ductile iron castings according to claim 1, characterized in that: A second heat insulation cylinder (13) is fixed to the inner wall of the material cylinder (14). The inner diameter of the second heat insulation cylinder (13) is the same as the inner diameter of the feeding area (2). The bottom of the inner cavity of the material cylinder (14) is inclined. The discharge pipe (12) is located at the bottom end of the bottom of the inner cavity of the material cylinder (14).

3. The waste cast iron chips recycling and melting device for ductile iron castings according to claim 1, characterized in that: The heat exchange box (16) is circular ring-shaped. Fixing blocks (19) are evenly fixed to the side wall of the heat exchange box (16). The heat exchange box (16) is fixedly connected to the inner wall of the first heat insulation cylinder (6) through the fixing blocks (19).

4. A nodular cast iron waste cast iron chip recycling and melting device according to claim 1, characterized in that: A ball valve is provided at one end of the water supply pipe (10). Heat insulation pads are wrapped on the outer surfaces of the steam discharge pipe (9), the air inlet pipe (11), and the air outlet pipe.

5. A recycled melting device for waste cast iron chips of ductile iron castings according to claim 1, characterized in that: An isolation net is fixed to the end of the air inlet pipe (11) far from the suction fan (8).

6. The waste cast iron chips recycling and melting device for ductile iron castings according to claim 1, characterized in that: Water level gauges (20) are provided in both the upper recovery cavity and the lower recovery cavity.

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