Medium-frequency furnace tapping stream inoculation device and using method

By designing an incubation device for iron discharge with the flow of the incubation agent with the pneumatic shut-off valve and other components, the flow rate and flow rate of the incubation agent are controlled, so that it flows into the casting package with molten iron, the problems of uneven and inconvenient addition of the incubation agent in the existing incubation methods are solved, and better incubation effect and product quality are achieved.

CN120095104APending Publication Date: 2025-06-06GUANGXI YUCHAI MACHINE PARTS MFG CO LTD
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Patent Information

Application Number
CN202510508857.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-22
Publication Date
2025-06-06

AI Technical Summary

Technical Problem

The existing intravenous methods for iron extraction of medium-frequency furnaces have problems such as infertility that tend to stick to the bottom and agglomerate, resulting in uneven births, and inconvenient addition of infertility, which affects product quality and increases costs.

Method used

A medium-frequency furnace iron discharge incubation device is designed, including an intermediate-frequency furnace cover, a incubator silo, an inclined feeding pipe and control components. Through components such as pneumatic shutoff valve, heat-resistant steel pipe and hose, the flow rate and flow rate of the incubator are controlled so that it flows into the casting pack with molten iron.

Benefits of technology

It realizes uniform melting and absorption of inoculant, improves product quality, simplifies the addition process of inoculant, has a wide range of application and strong practicality.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses an intermediate frequency furnace tapping stream inoculation device and a use method, belongs to the technical field of casting, and solves the problem of poor tapping inoculation effect of an existing intermediate frequency furnace. 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, the inoculant flows into the casting ladle along with the molten iron, the inoculant is melted and absorbed better, and the product quality is improved.
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Description

Technical Field

[0001] The invention relates to the technical field of casting, and in particular to a medium frequency furnace iron-tapping flow inoculation device and a use method thereof. Background Art

[0002] In the process of metal smelting, inoculation is an important process. In the process of casting, when the molten iron is poured from the medium frequency furnace into the ladle, the inoculant is added to the molten iron by some method to change the metallurgical state of the molten iron, thereby improving the crystallization characteristics, microstructure and performance of the cast iron. It is an important means to improve the performance of castings in modern casting production. The main influencing factors of inoculation are the uniformity of the inoculation amount and the matching relationship between the inoculation time and the molten iron tapping time.

[0003] At present, one method of inoculation for medium frequency furnace tapping in foundry enterprises is ladle bottom inoculation, that is, adding the inoculant to the bottom of the ladle before tapping. The disadvantages of this scheme are: if the inoculant is added to the ladle too early, it is easy to stick to the bottom of the ladle, resulting in poor inoculation effect; if there is residual molten iron in the ladle, the inoculant is easy to agglomerate, resulting in uneven inoculation of the molten iron; it is inconvenient to add the inoculant after using the molten iron transfer project. The other is the semi-flow inoculation device inoculation, that is, the inoculant is first added to a device, and then the device is opened when the molten iron is tapped to allow the inoculant to flow into the ladle. This inoculation method solves the problem of the inoculant sticking to the ladle and the problem of inconvenient addition of inoculation during molten iron transfer, but there is also the problem that part of the inoculant floats on the surface of the molten iron because the molten iron does not flush the inoculant, the melting is not good, and the inoculation effect is poor, which affects the product quality and causes a lot of slag. The slag removal personnel increase the workload, and also increase the cost and quality risks. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a medium frequency furnace iron-tapping flow inoculation device and a method of use in view of the above-mentioned deficiencies in the prior art, so that the inoculant flows into the ladle along with the molten iron, the inoculant is melted and absorbed better, the product quality is improved, and the device has the characteristics of easy use and strong practicality.

[0005] The technical solution adopted by the present invention is: a medium frequency furnace iron-tapping flow inoculation device, comprising a medium frequency furnace cover, the medium frequency furnace cover is arranged above the medium frequency furnace, an inoculant silo is arranged above the medium frequency furnace cover, an inclined feeding pipe is arranged at the bottom of the inoculant silo, an outlet groove is opened on the medium frequency furnace cover, an iron tapping trough is arranged in the outlet groove, a discharge port at the lower end of the feeding pipe extends through the medium frequency furnace cover and is located above the iron tapping trough, a control component for controlling the flow rate of the inoculant is provided on the feeding pipe, a barrier component for controlling the flow rate is plugged on one end of the feeding pipe near the discharge port, and the control component is electrically connected to the control system of the medium frequency furnace.

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

[0007] Furthermore, a support frame is provided on the cover of the intermediate frequency furnace, and the feed pipe is arranged obliquely on the support frame.

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

[0009] Furthermore, the barrier assembly includes a blocking plate and a magnet, the magnet is arranged at the lower end of the blocking plate, the blocking plate is plugged into the feed pipe, and a plurality of flow holes are formed on the blocking plate.

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

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

[0012] A method for using a medium frequency furnace iron-tapping flow inoculation device, the specific operating steps are as follows:

[0013] Step 1: First, use the control valve to close the pneumatic stop valve, then add the weighed inoculant into the inoculant silo, and add the required amount according to the value on the scale;

[0014] Step 2: According to the inoculant addition flow rate required by the product, select a baffle plate that meets the flow rate and insert it into the feed pipe. Different baffle plates have different flow hole diameters, and the flow rate is controlled by the size of the flow hole;

[0015] Step three, after the medium frequency furnace tilts to tap iron, the control valve opens the pneumatic stop valve. The inoculant flows through the pneumatic stop valve through the pipe mouth to the molten iron in the tapping trough and flows into the casting ladle together with the molten iron. It has a long contact time with the molten iron and is flushed into the ladle together, so the inoculant is evenly absorbed.

[0016] Beneficial Effects

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The invention discloses a flow-based inoculation device for tapping iron in a medium frequency furnace. The device first uses a control valve to close the pneumatic stop valve, then adds the weighed inoculant into the inoculant silo, adds the required amount according to the value of the scale, controls the flow rate according to the inoculant required by the product, selects a baffle plate that meets the flow rate and inserts it into the feeding pipe, controls the flow rate according to the size of the flow hole, and after the medium frequency furnace is tilted to tap iron, the control valve opens the pneumatic stop valve, and the inoculant flows through the pneumatic stop valve through the pipe mouth to the molten iron in the tapping trough and flows into the casting ladle together with the molten iron, has a long contact time with the molten iron, and is flushed into the ladle together, so that the inoculant is evenly absorbed. No matter at which angle the medium frequency furnace taps iron, the inoculant can be normally added, and the amount of slag on the molten iron surface in the ladle is significantly reduced after tapping iron, indicating that the inoculant has been fully melted, effectively improving the product quality, and having the characteristics of strong practicality and wide application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0020] Figure 2 It is an enlarged schematic diagram of the cross-sectional structure of the feeding pipe in the present invention.

[0021] Among them: 1-intermediate frequency furnace cover, 2-control component, 3-barrier component, 4-inoculant silo, 5-feeding pipe, 6-scale, 7-exit trough, 8-iron outlet trough, 9-intermediate frequency furnace, 10-flow hole, 11-support frame, 12-discharge port, 21-pneumatic stop valve, 22-heat-resistant steel pipe, 23-hose, 31-magnet, 32-blocking plate. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0023] See also Figure 1-2As shown, a medium frequency furnace iron-tapping flow inoculation device of the present invention comprises a medium frequency furnace cover 1, which is arranged above the medium frequency furnace 9, an inoculant silo 4 is arranged above the medium frequency furnace cover 1, and an inclined feeding pipe 5 is arranged at the bottom of the inoculant silo 4, an outlet slot 7 is opened on the medium frequency furnace cover 1, and an iron-tapping slot 8 is arranged in the outlet slot 7, and a discharge port 12 at the lower end of the feeding pipe 5 extends through the medium frequency furnace cover 1 and is located above the iron-tapping slot 8, a control component 2 for controlling the flow rate of the inoculant is provided on the feeding pipe 5, and a barrier component 3 for controlling the flow rate is plugged on one end of the feeding pipe 5 near the discharge port 12, and the control component 2 is electrically connected to the control system of the medium frequency furnace, and the pneumatic stop valve 21 is closed by using a control valve first, Then add the weighed inoculant into the inoculant silo 4, add the required amount according to the value of the scale 6, control the flow rate according to the inoculant required by the product, select the baffle plate 32 that meets the flow rate and insert it into the feed pipe 5, and control the flow rate by the size of the flow hole 10. After the intermediate frequency furnace 9 is tilted to tap the iron, the control valve opens the pneumatic stop valve 21, and the inoculant flows through the pneumatic stop valve 21 through the pipe mouth to the molten iron in the iron tapping trough 7 and flows 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, so the inoculant is evenly absorbed. No matter at which angle the intermediate frequency furnace 9 taps the iron, the inoculant can be added normally. After tapping the 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 melted, effectively improving the product quality.

[0024] Specifically, the control component 2 includes a pneumatic stop valve 21, a heat-resistant steel pipe 22 and a hose 23. The pneumatic stop valve 21 is installed on the feeding pipe 5. The input and output ends of the pneumatic stop valve 21 are both provided with a heat-resistant steel pipe 22. The heat-resistant steel pipe 22 is connected to an external air source containing compressed air through the hose 23. The pneumatic stop valve 21 can be used continuously in a high-temperature environment and can meet the high-temperature requirements of the on-site environment. The hose 23 is connected only after the heat-resistant steel pipe 22 is extended to the outside, which effectively protects the hose 23 from damage and ensures that the ventilation can operate for a long time.

[0025] Preferably, a support frame 11 is provided on the intermediate frequency furnace cover 1, and the feed pipe 5 is arranged obliquely on the support frame 11. The support frame 11 provides favorable support for the feed pipe 5, ensuring that the feed pipe 5 is arranged obliquely, which is beneficial to discharge.

[0026] 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 conducive to controlling the flow rate at the small diameter below.

[0027] Furthermore, the barrier 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 plugged into the feed pipe 5. A plurality of flow holes 10 are provided on the baffle plate 32. According to different product requirements, a plurality of 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 plugged 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 within 2 / 3 of the iron-discharging time. The magnet 31 has an adsorption effect on the feed pipe 5, making the installation more secure.

[0028] Furthermore, a scale 6 is provided on the inner wall of the inoculant silo 4, and the inoculant can be quantified according to the value of the scale 6, so that the amount added during the adding process can be known, which is convenient for controlling the addition of the inoculant.

[0029] Furthermore, the inclination angle between the feeding pipe 5 and the intermediate frequency furnace cover 1 is 40-60 degrees, ensuring that the inoculant can be normally discharged at each position during iron tapping.

[0030] A method for using a medium frequency furnace iron-tapping flow inoculation device, the specific operating steps are as follows:

[0031] Step 1: First, use the control valve to close the pneumatic stop valve 21, and then add the weighed inoculant into the inoculant silo 4, adding the required amount according to the value of the scale 6;

[0032] Step 2: According to the inoculant addition flow rate required by the product, select a baffle plate 32 that meets the flow rate and insert it into the feed pipe 5. Different baffle plates 32 have different flow holes 10 diameters, and the flow rate is controlled by the size of the flow hole 10;

[0033] Step three, after the medium frequency furnace is tilted to tap iron, the control valve opens the pneumatic stop valve 21, and the inoculant flows through the pneumatic stop valve 21 through the pipe mouth to the molten iron in the tapping trough 8 and flows into the casting ladle together with the molten iron. The inoculant is in contact with the molten iron for a long time and is flushed into the ladle together, so that the inoculant is evenly absorbed.

[0034] When using a medium frequency furnace iron-tapping inoculation device of the present embodiment, first use the control valve to close the pneumatic stop valve 21, then add the weighed inoculant into the inoculant silo 4, add the required amount according to the value of the scale 6, control the flow rate according to the inoculant required by the product, select the baffle plate 32 that meets the flow rate and insert it into the feed pipe 5, and control the flow rate by the size of the flow hole 10. After the medium frequency furnace 9 tilts to tap iron, the control valve opens the pneumatic stop valve 21, and the inoculant flows through the pneumatic stop valve 21 through the pipe mouth to the molten iron in the iron tapping trough 7 and flows into the casting ladle together with the molten iron. The inoculant has a long contact time with the molten iron and is flushed into the ladle together, so that the inoculant is evenly absorbed. No matter at which angle the medium frequency furnace 9 taps iron, 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 melted, thereby effectively improving the product quality. The medium frequency furnace tapping inoculant device and use method of the present invention enable the inoculant to flow into the ladle along with the molten iron, so that the inoculant is melted and absorbed better, thus improving the product quality and having the characteristics of being easy to use and highly practical.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A medium frequency furnace iron-tapping inoculation device, characterized in that: The invention comprises a furnace cover (1) of an intermediate frequency furnace, wherein the furnace cover (1) of the intermediate frequency furnace is arranged above an intermediate frequency furnace (9), an inoculant silo (4) is arranged above the furnace cover (1), an inclined feed pipe (5) is arranged at the bottom of the inoculant silo (4), an outlet slot (7) is opened on the furnace cover (1), an iron outlet slot (8) is arranged in the outlet slot (7), a discharge port (12) at the lower end of the feed pipe (5) extends through the furnace cover (1) of the intermediate frequency furnace and is located above the iron outlet slot (8), a control component (2) for controlling the flow rate of the inoculant is arranged on the feed pipe (5), a barrier component (3) for controlling the flow rate is inserted on one end of the feed pipe (5) near the discharge port (12), and the control component (2) is electrically connected to the control system of the intermediate frequency furnace.

2. The medium frequency furnace iron-tapping inoculation device according to claim 1, characterized in that: The control assembly (2) comprises a pneumatic stop valve (21), a heat-resistant steel pipe (22) and a 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 both provided with a heat-resistant steel pipe (22). The heat-resistant steel pipe (22) is connected to an external air source containing compressed air through the hose (23).

3. The medium frequency furnace iron-tapping inoculation device according to claim 1, characterized in that: A support frame (11) is provided on the intermediate frequency furnace cover (1), and the feed pipe (5) is arranged obliquely on the support frame (11).

4. The medium frequency furnace iron-tapping inoculation device according to claim 1, characterized in that: The feeding pipe (5) is of a funnel-shaped structure, and the diameter of the cross section of the feeding pipe (5) gradually decreases from top to bottom.

5. The medium frequency furnace iron-tapping inoculation device according to claim 1, characterized in that: The barrier assembly (3) comprises a blocking plate (32) and a magnet (31), wherein the magnet (31) is arranged at the lower end of the blocking plate (32), the blocking plate (32) is plugged into the feed pipe (5), and a plurality of flow holes (10) are provided on the blocking plate (32).

6. The medium frequency furnace tapping inoculation device according to claim 1, characterized in that: A scale (6) is provided on the inner wall of the inoculant silo (4).

7. The medium frequency furnace iron-tapping inoculation device according to claim 1, characterized in that: The inclination angle between the feed pipe (5) and the intermediate frequency furnace cover (1) is 40-60°.

8. A method for using a medium frequency furnace iron-tapping inoculation device, characterized in that: The specific steps are as follows: Step 1: first use the control valve to close the pneumatic stop valve (21), then add the weighed inoculant into the inoculant silo (4) to the required amount according to the value of the scale (6); Step 2: According to the inoculant addition flow rate required by the product, a baffle plate (32) that meets the flow rate is selected and inserted into the feed pipe (5). Different baffle plates (32) have flow holes (10) of different diameters, and the flow rate is controlled by the size of the flow hole (10); Step three, after the medium frequency furnace is tilted to tap iron, the control valve opens the pneumatic stop valve (21), and the inoculant flows through the pneumatic stop valve (21) through the pipe mouth to the molten iron in the tapping trough (8) and flows into the casting ladle together with the molten iron. The inoculant is in contact with the molten iron for a long time and is flushed into the ladle together, so that the inoculant is evenly absorbed.