Medium-frequency furnace tapping stream inoculation device

Abstract

The utility model discloses an intermediate frequency furnace tapping stream inoculation device, belongs to the technical field of casting, and solves the problem that the existing intermediate frequency furnace tapping inoculation effect is poor. The inoculation device comprises an intermediate frequency furnace cover, the intermediate frequency furnace cover is arranged above an intermediate frequency furnace, an inoculant bin is arranged above the intermediate frequency furnace cover, an obliquely-arranged feeding pipe is arranged at the bottom of the inoculant bin, an outlet groove is formed in the intermediate frequency furnace cover, an iron outlet groove is formed in the outlet groove, and the iron outlet groove is communicated with the intermediate frequency furnace cover. A discharging port in the lower end of the feeding pipe extends and penetrates through a furnace cover of the intermediate frequency furnace to be located above an iron outlet groove, a control assembly used for controlling the flow of an inoculant is arranged on the feeding pipe, and a partition assembly used for controlling the flow speed is connected to the end, close to the discharging port, of the feeding pipe in an inserted mode. According to the tapping stream inoculation device of the intermediate frequency furnace and the using method, an inoculant flows into the casting ladle along with molten iron, the inoculant is melted and absorbed better, and the product quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, and in particular to a medium-frequency furnace tapping iron-inoculating device. Background Technology

[0002] In metal smelting, in-flow inoculation is a crucial process. During casting, as molten iron is poured from a medium-frequency furnace into a ladle, an inoculant is added to the molten iron to alter its metallurgical state, thereby improving the crystallinity, microstructure, and properties of the cast iron. This is a vital method for enhancing casting performance in modern casting production. The main influencing factors for in-flow inoculation are the uniformity of the inoculation amount and the matching relationship between the inoculation time and the tapping time of the molten iron.

[0003] Currently, one method of inoculation in intermediate frequency furnaces used in foundry production is bottom inoculation, where the inoculant is added to the bottom of the ladle before tapping. Disadvantages of this method include: adding it too early can cause the inoculant to stick to the bottom, resulting in poor inoculation; if there is residual molten iron in the ladle, the inoculant can clump, leading to uneven inoculation; and adding the inoculant is inconvenient after using molten iron transfer systems. Another method is semi-flow inoculation, where the inoculant is added to a device first, and then the device is opened during tapping to allow the inoculant to flow into the ladle. This method solves the problems of inoculant sticking to the ladle and the inconvenience of adding inoculant during molten iron transfer. However, it also has the problem of some inoculant floating on the surface of the molten iron due to insufficient dissolution, resulting in poor inoculation and affecting product quality. It also leads to excessive slag, increasing the workload for slag removal personnel, as well as increasing costs and quality risks. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the above-mentioned shortcomings of the prior art by providing a medium-frequency furnace tapping inoculant device, which allows the inoculant to flow into the ladle with the molten iron, resulting in better melting and absorption of the inoculant, improving product quality, and featuring convenient use and strong practicality.

[0005] The technical solution adopted by this utility model is: a medium-frequency furnace inoculant device for iron tapping, including a medium-frequency furnace cover, the medium-frequency furnace cover being disposed above the medium-frequency furnace, an inoculant hopper being disposed above the medium-frequency furnace cover, an inclined feeding pipe being disposed at the bottom of the inoculant hopper, an outlet groove being opened on the medium-frequency furnace cover, an iron tapping groove being disposed in the outlet groove, the discharge port at the lower end of the feeding pipe extending through the medium-frequency furnace cover and located above the iron tapping groove, a control component for controlling the inoculant flow rate being disposed on the feeding pipe, a baffle component for controlling the flow rate being inserted into one end of the feeding pipe near the discharge port, and the control component being electrically connected to the control system of the medium-frequency furnace.

[0006] As a further improvement, the control component includes a pneumatic shut-off valve, a heat-resistant steel pipe, and a hose. The pneumatic shut-off valve is installed on the feed pipe, and both the input and output ends of the pneumatic shut-off valve are equipped with heat-resistant steel pipes. The heat-resistant steel pipes are connected to an external air source containing compressed air through the hose.

[0007] Furthermore, the furnace cover of the medium-frequency furnace is provided with a support frame, and the feeding pipe is arranged obliquely on the support frame.

[0008] Furthermore, the feeding pipe has a funnel-shaped structure, and the diameter of the cross-section of the feeding pipe gradually decreases from top to bottom.

[0009] Furthermore, the baffle assembly includes a barrier plate and a magnet, the magnet being arranged at the lower end of the barrier plate, the barrier plate being inserted into the feeding pipe, and the barrier plate having multiple flow holes.

[0010] Furthermore, a scale is provided on the inner wall of the inoculant hopper.

[0011] Furthermore, the inclination angle between the feeding pipe and the furnace cover of the medium-frequency furnace is 40-60°.

[0012] Beneficial effects

[0013] Compared with the prior art, this utility model has the following advantages:

[0014] This utility model discloses a medium-frequency furnace tapping inoculant device. First, the pneumatic shut-off valve is closed using a control valve. Then, the weighed inoculant is added to the inoculant hopper according to the scale reading. The flow rate is controlled according to the required inoculant flow rate for the product. A baffle plate matching the flow rate is inserted into the feeding pipe, and the flow rate is controlled by the size of the flow orifice. After the medium-frequency furnace is tilted for tapping, the control valve opens the pneumatic shut-off valve. The inoculant flows through the pneumatic shut-off valve and into the molten iron in the tapping trough, flowing into the ladle together with the molten iron. This results in prolonged contact with the molten iron and simultaneous entry into the ladle, ensuring uniform inoculant absorption. Regardless of the tapping angle of the medium-frequency furnace, the inoculant can be added normally. After tapping, the slag on the surface of the molten iron in the ladle is significantly reduced, indicating that the inoculant has been fully dissolved, effectively improving product quality. This device is highly practical and has a wide range of applications. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0016] Figure 2 This is an enlarged cross-sectional view of the feeding pipe in this utility model.

[0017] Among them: 1-Induction furnace cover, 2-Control components, 3-Baffle components, 4-Inoculant hopper, 5-Feeding pipe, 6-Scale, 7-Outlet trough, 8-Iron tapping trough, 9-Induction furnace, 10-Flow orifice, 11-Support frame, 12-Discharge port, 21-Pneumatic shut-off valve, 22-Heat resistant steel pipe, 23-Hose, 31-Magnet, 32-Blocking plate. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0019] See Figure 1-2 As shown, this utility model discloses a medium-frequency furnace inoculant device for iron tapping, comprising a medium-frequency furnace cover 1, which is positioned above the medium-frequency furnace 9. An inoculant silo 4 is located above the furnace cover 1, and an inclined feeding pipe 5 is located at the bottom of the inoculant silo 4. An outlet groove 7 is formed on the furnace cover 1, and an iron tapping groove 8 is located within the outlet groove 7. The discharge port 12 at the lower end of the feeding pipe 5 extends through the furnace cover 1 and is located above the iron tapping groove 8. A control component 2 for controlling the inoculant flow rate is provided on the feeding pipe 5. A baffle component 3 for controlling the flow rate is inserted into one end of the feeding pipe 5 near the discharge port 12. The control component 2 is electrically connected to the control system of the medium-frequency furnace. The pneumatic shut-off valve 21 is first closed using a control valve. Then, the weighed inoculant is added to the inoculant hopper 4, according to the value on the scale 6. The required amount is added, and the flow rate is controlled according to the inoculant required for the product. A baffle plate 32 that matches the flow rate is inserted into the feeding pipe 5. The flow rate is controlled by the size of the flow orifice 10. After the medium frequency furnace 9 tilts to tap iron, the control valve opens the pneumatic shut-off valve 21. The inoculant flows through the pneumatic shut-off valve 21 and into the molten iron in the tapping trough 7, flowing into the casting ladle together with the molten iron. The contact time with the molten iron is long, and it is flushed into the ladle together, resulting in uniform inoculation and good absorption. No matter what angle the medium frequency furnace 9 taps iron at, the inoculant can be added normally. After tapping iron, the amount of slag on the surface of the molten iron in the ladle is significantly reduced, indicating that the inoculant has been fully dissolved, effectively improving the product quality.

[0020] Specifically, the control component 2 includes a pneumatic shut-off valve 21, a heat-resistant steel pipe 22, and a hose 23. The pneumatic shut-off valve 21 is installed on the feed pipe 5. Both the input and output ends of the pneumatic shut-off valve 21 are equipped with heat-resistant steel pipes 22. The heat-resistant steel pipe 22 is connected to an external air source containing compressed air through the hose 23. The pneumatic shut-off valve 21 can be used continuously in high-temperature environments, which can meet the high-temperature requirements of the on-site environment. The heat-resistant steel pipe 22 is extended to the outside before connecting to the hose 23, which effectively protects the hose 23 from damage and ensures long-term operation of the ventilation system.

[0021] Preferably, the furnace cover 1 of the medium frequency furnace is provided with a support frame 11, and the feeding pipe 5 is arranged at an inclination on the support frame 11. The support frame 11 provides favorable support for the feeding pipe 5, ensuring that the feeding pipe 5 is arranged at an inclination, which is conducive to material discharge.

[0022] Furthermore, the feed pipe 5 has a funnel-shaped structure, and the diameter of the cross-section of the feed pipe 5 gradually decreases from top to bottom, which is beneficial for controlling the flow rate at the lower small diameter.

[0023] Furthermore, the baffle assembly 3 includes a baffle plate 32 and a magnet 31. The magnet 31 is arranged at the lower end of the baffle plate 32. The baffle plate 32 is inserted into the feed pipe 5. The baffle plate 32 has multiple flow holes 10. According to different product requirements, multiple baffle plates 32 with flow holes 10 of different diameters are prepared. According to different molten iron requirements, different flow rates are controlled. A suitable baffle plate 32 is selected and inserted into the feed pipe 5 to control the flow rate and strictly control the addition time of the inoculant. The inoculant is controlled to flow out in 2 / 3 of the iron tapping time. The magnet 31 has an adsorption effect on the feed pipe 5, making the installation more secure.

[0024] Furthermore, the inner wall of the inoculant hopper 4 is equipped with a scale 6. The inoculant can be quantified according to the value of the scale 6, so as to know how much has been added during the addition process, which makes it easier to control the addition of inoculant.

[0025] Furthermore, the inclination angle between the feed pipe 5 and the induction furnace cover 1 is 40-60° to ensure that the inoculant can be completely discharged at each position when tapping iron.

[0026] In this embodiment, the inoculant device for induction furnace tapping is used by first closing the pneumatic shut-off valve 21 using the control valve. Then, the weighed inoculant is added to the inoculant hopper 4 according to the value on the scale 6. The flow rate of the inoculant is controlled according to the product requirements. A baffle plate 32 that matches the flow rate is inserted into the feeding pipe 5. The flow rate is controlled by the size of the flow orifice 10. After the induction furnace 9 is tilted to tap iron, the control valve opens the pneumatic shut-off valve 21. The inoculant flows through the pneumatic shut-off valve 21 and into the molten iron in the tapping trough 7, flowing into the ladle together with the molten iron. The contact time with the molten iron is long, and the inoculant is flushed into the ladle together, resulting in uniform and good absorption of the inoculant. No matter what angle the induction furnace 9 is tapping iron at, the inoculant can be added normally. After tapping iron, the amount of slag on the surface of the molten iron in the ladle is significantly reduced, indicating that the inoculant has been fully dissolved, effectively improving the product quality. This utility model discloses a medium-frequency furnace tapping inoculant device, which allows the inoculant to flow into the ladle along with the molten iron, resulting in better melting and absorption of the inoculant, thus improving product quality. It is convenient to use and highly practical.

[0027] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present utility model. These modifications and improvements will not affect the effectiveness of the present utility model or the practicality of the patent.

Claims

1. A device for on-stream inoculation of molten iron in an intermediate frequency furnace, characterized in that, The utility model provides a kind of inductive furnace cover (1), the inductive furnace cover (1) is arranged above inductive furnace (9), the inductive furnace cover (1) is equipped with inoculant bin (4) above, the bottom of the inoculant bin (4) is equipped with obliquely arranged feeding pipe (5), the inductive furnace cover (1) is equipped with outlet groove (7) on, the outlet groove (7) is equipped with taphole (8) inside, the outlet of the feeding pipe (5) (12) extends through inductive furnace cover (1) and is located above taphole (8), the feeding pipe (5) is equipped with control assembly (2) for controlling the flow of inoculant, the end of feeding pipe (5) close to the outlet (12) is inserted with the control assembly (3) for controlling flow rate, the control assembly (2) is electrically connected with the control system of inductive furnace.

2. The device according to claim 1, characterized in that, The control assembly (2) includes pneumatic stop valve (21), heat-resistant steel pipe (22) and hose (23), the pneumatic stop valve (21) is installed on the feeding pipe (5), the input end and the output end of the pneumatic stop valve (21) are equipped with heat-resistant steel pipe (22), the heat-resistant steel pipe (22) is communicated with external air source containing compressed air by hose (23).

3. The device according to claim 1, characterized in that, The inductive furnace cover (1) is equipped with support frame (11), and the feeding pipe (5) is obliquely arranged on the support frame (11).

4. The device according to claim 1, characterized in that, The feeding pipe (5) is in the form of a funnel, and the diameter of the cross section of the feeding pipe (5) gradually decreases from top to bottom.

5. The device according to claim 1, characterized in that, The barrier assembly (3) includes a blocking plate (32) and a magnet (31), the magnet (31) is arranged at the lower end of the blocking plate (32), the blocking plate (32) is inserted into the feeding pipe (5), and a plurality of flow holes (10) are formed in the blocking plate (32).

6. The device according to claim 1, characterized in that, The inner wall of the inoculant bin (4) is provided with a scale (6).

7. The device according to claim 1, characterized in that, The inclination angle between the feeding pipe (5) and the inductive furnace cover (1) is 40-60°.

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