A nodularizing treatment device for ductile iron production

Abstract

The present invention relates to the technical field of cast iron production, and specifically, to a spheroidizing treatment device for ductile iron production. The molten iron delivery pipes are symmetrically arranged. The molten iron delivery pipes penetrate through the molten iron ladle and are horizontally directed towards a valve mechanism arranged inside the molten iron ladle. The molten iron delivered from the molten iron delivery pipes is used as power to impact the valve mechanism. The valve mechanism is used to control the feeding amount of spheroidizing agent in the hopper according to the amount of molten iron delivered. An elastic nitrogen supplement mechanism is connected above the valve mechanism. The nitrogen supplement mechanism is respectively connected to a nitrogen tank and a gas delivery pipe that penetrates through the valve mechanism. The nitrogen supplement mechanism supplies the nitrogen in the nitrogen tank into the gas delivery pipe by the up and down movement of the valve mechanism to supplement the nitrogen lost in the bell jar and limit the intensity of the spheroidizing reaction. The power plate is impacted by the molten iron, so that the valve plate can control the feeding amount of spheroidizing agent according to the impact force of the molten iron, avoiding too much or too little feeding amount and affecting the effect of the spheroidizing reaction.

Description

Technical Field

[0001] The present invention relates to the technical field of cast iron production, and more specifically, to a spheroidizing treatment device for ductile iron production. Background Art

[0002] Ductile iron obtains spherical graphite through spheroidizing and inoculation treatments, effectively improving the mechanical properties of cast iron. Its comprehensive properties are close to those of steel. Based on its excellent properties, it has been successfully used to cast some parts with complex stress, high requirements for strength, toughness, and wear resistance.

[0003] Regarding the production devices for ductile iron castings, there are many existing technologies. For example:

[0004] Chinese Patent Publication No. CN113088614B discloses a production device for ductile iron castings to improve poor spheroidization, including a spheroidizing ladle, a limiting mechanism, an infrared thermometer, a lifting mechanism, and a discharge control mechanism. A set of inclined first temperature measurement holes are provided on the connecting frame, and a set of second temperature measurement holes with the same inclination angle as the first temperature measurement holes are provided on the bracket. A first limiting groove is provided on the upper surface of the bottom end of the bracket. The limiting support block is movably installed on the bracket, and the bottom end of the limiting support block is installed in the first limiting groove. The limiting support block and the bracket are connected by bolts. The temperature measurement probe of the infrared thermometer is installed inside the second temperature measurement hole. The settings of the first temperature measurement hole and the second temperature measurement hole enable the infrared thermometer to measure the temperature of the molten iron inside the spheroidizing ladle, thereby accurately understanding the temperature of the molten iron, and thus better controlling the addition time of the ductile iron inoculant and improving the situation of poor spheroidization.

[0005] It can be seen from the above that in the prior art, in order to improve the spheroidization effect of cast iron graphite, the pre-prepared spheroidizing agent is usually placed in the spheroidizing ladle by the plunging method, and then the molten iron is poured into the spheroidizing ladle for spheroidization reaction. However, 1. The amount of molten iron in the spheroidizing ladle is different each time during the spheroidization reaction, which requires adjustment of the corresponding spheroidizing agent. Most of the addition of the spheroidizing agent is manually operated, and the contact between the molten iron and the external air easily causes oxidation of the molten iron. Moreover, manual operation may also result in excessive or insufficient addition of the spheroidizing agent. Excessive addition of the spheroidizing agent will reduce the hardness of the ductile iron, leading to a decrease in strength and toughness. Insufficient addition of the spheroidizing agent will result in insufficient residual magnesium content, thus affecting the spheroidization effect.

[0006] 2. At the initial stage of the spheroidization reaction between the spheroidizing agent and the molten iron, the chemical reaction is intense, a large amount of the spheroidizing agent is oxidized, the absorption rate of the spheroidizing agent is relatively low, and the amount of flue gas emitted is large, affecting the surrounding environment. Summary of the Invention

[0007] The object of the present invention is to provide a nodulizing treatment device for ductile iron production to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention aims to provide a nodulizing treatment device for ductile iron production, including a ladle, an iron melt delivery pipe, a bell jar, and a nitrogen tank. Among them, the nitrogen tank is arranged on the upper surface of the bell jar, and a feeding hopper is fixed at the bottom of the bell jar. The iron melt delivery pipes are symmetrically arranged. The iron melt delivery pipes penetrate through the ladle and horizontally point to a valve mechanism arranged inside the ladle. The iron melt transported from the iron melt delivery pipes is used as power to impact the valve mechanism. The valve mechanism is used to control the feeding amount of the nodulizer in the feeding hopper according to the transported amount of iron melt. An elastic nitrogen supplement mechanism is elastically connected above the valve mechanism. The nitrogen supplement mechanism is respectively connected to the nitrogen tank and an air delivery pipe that penetrates through the valve mechanism. The nitrogen supplement mechanism uses the up and down movement of the valve mechanism to supply the nitrogen in the nitrogen tank into the air delivery pipe to supplement the nitrogen lost in the bell jar and limit the intensity of the nodulizing reaction.

[0009] As a further improvement of this technical solution, a partition plate fixedly connected to the bell jar is arranged at the bottom of the feeding hopper. Notches on both sides of the partition plate are used to accommodate the iron melt delivery pipes. And the partition plate is sleeved inside the ladle. There is a gap between the outer diameter of the partition plate and the inner diameter of the ladle. This gap allows nitrogen to form an air flow inside the ladle and limits the contact between the iron melt and external air.

[0010] As a further improvement of this technical solution, the valve mechanism includes power plates symmetrically distributed at the bottom. The two power plates on both sides enclose an inverted trapezoid. Each power plate gradually inclines outward from the lower end to the upper end direction, and the power plate is used to block the iron melt transported by the iron melt delivery pipes, so that the power plate has a tendency to move upward.

[0011] As a further improvement of this technical solution, the valve mechanism further includes a valve plate with its edge turned up. Under normal conditions, the turned-up part of the valve plate fits with the discharge port of the feeding hopper. A sleeve is fixedly connected between the valve plate and the power plate. The power plate, the valve plate, and the sleeve are all penetrated by the air delivery pipe. The iron melt impacts the power plate, causing the valve plate to move upward to open the discharge port to control the feeding amount of the nodulizer.

[0012] As a further improvement of this technical solution, the nitrogen supplement mechanism includes a reciprocating pull rod fixedly connected to the valve plate at the bottom. The top of the reciprocating pull rod is sleeved and cooperated with an air delivery cylinder that penetrates through the bell jar and is fixedly connected to the bell jar. The top of the air delivery cylinder is connected to the nitrogen tank. A first one-way valve for nitrogen to enter the air delivery cylinder is arranged at the connection between the air delivery cylinder and the nitrogen tank. An air guide pipe communicating with the outside is arranged on the air delivery cylinder close to the reciprocating pull rod. The air delivery cylinder is connected to the air delivery pipe.

[0013] As a further improvement of the technical solution, one end of the gas transmission pipe is communicated with the through hole opened on the side wall of the bell jar, and the other end is flush with the lower edge of the partition plate in the horizontal direction, and a second one-way valve for allowing the nitrogen gas in the hot metal ladle to enter the gas transmission pipe is arranged in the through hole.

[0014] As a further improvement of the technical solution, a baffle plate flush with the bottom of the gas transmission cylinder is fixedly connected to the gas transmission pipe, and a tension spring is elastically connected between the bottom of the baffle plate and the valve plate. The tension spring is sleeved on the gas transmission pipe. Under normal conditions, the tension spring is in a stretched state.

[0015] As a further improvement of the technical solution, an opening and closing device for diffusing the spheroidizing agent is arranged at the bottom of the feeding hopper. Among them, the opening and closing device includes an outer feeding plate whose outer edge fits the inner wall of the bell jar, and an inner feeding plate located below the outer feeding plate and fitting the outer feeding plate. The outer edge of the inner feeding plate is fixedly connected to the inner wall of the bell jar. A plurality of feeding holes are opened on both the outer feeding plate and the inner feeding plate. Under normal conditions, the feeding holes on the outer feeding plate and the inner feeding plate are in a staggered state.

[0016] As a further improvement of the technical solution, an outer sleeve ring is coaxially connected to the top of the outer feeding plate. A wedge block is fixedly connected to the inner wall of the outer sleeve ring. The wedge block abuts against the convex block fixed to the bottom of the valve plate. An inner sleeve ring fixedly connected to the top of the inner feeding plate is arranged inside the inner circle of the outer sleeve ring. A return spring is elastically connected between the inner sleeve ring and the wedge block, so that when the convex block and the wedge block are separated, the feeding holes on the outer feeding plate and the inner feeding plate are made to coincide by using the elastic potential energy.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. In the spheroidizing treatment device for ductile iron production, the dynamic plate is impacted by the hot metal, so that the valve plate can control the feeding amount of the spheroidizing agent according to the impact force of the hot metal, avoiding too much or too little feeding amount and affecting the effect of the spheroidizing reaction.

[0019] 2. In the spheroidizing treatment device for ductile iron production, the nitrogen gas in the gas transmission cylinder is pressed into the hot metal ladle by the reciprocating pull rod. When the hot metal reacts with the spheroidizing agent, there is a continuously flowing nitrogen gas flow in the gap between the partition plate and the inner wall of the hot metal ladle, which can effectively prevent the hot metal from reacting with the oxygen in the air, avoid the oxidation of the hot metal, and the hot metal under the protection of nitrogen is more likely to form a stable spherical graphite structure, thereby improving the quality and performance of the spheroidized hot metal and reducing the generation of flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the overall structural schematic diagram of the present invention;

[0021] Figure 2 is the explosion structural schematic diagram of the hot metal ladle and the bell jar of the present invention;

[0022] Figure 3 Left view of the internal structure of the ladle and bell cutaway according to the present invention;

[0023] Figure 4 Front view of the internal structure of the bell cutaway according to the present invention;

[0024] Figure 5 Schematic diagram of the sectional structure of the gas delivery pipe, valve mechanism, and gas delivery cylinder according to the present invention;

[0025] Figure 6 Top view of the external blanking plate structure according to the present invention;

[0026] Figure 7 According to the present invention Figure 6 Schematic diagram of the enlarged structure at location A;

[0027] Figure 8 Exploded view of the valve plate, external blanking plate, internal blanking plate, and power plate according to the present invention.

[0028] The meanings of the various reference numerals in the figure are as follows:

[0029] 100, ladle; 101, molten iron delivery pipe; 110, bell; 111, nitrogen tank; 112, partition; 113, hopper;

[0030] 120, valve mechanism; 121, power plate; 122, valve plate; 123, sleeve; 124, convex block;

[0031] 130, nitrogen replenishment mechanism; 131, reciprocating pull rod; 132, gas delivery cylinder; 133, baffle;

[0032] 140, gas delivery pipe;

[0033] 150, tension spring;

[0034] 160, external blanking plate; 161, outer sleeve ring; 162, wedge block;

[0035] 170, internal blanking plate; 171, inner sleeve ring; 172, return spring. Detailed implementation manners

[0036] The technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without any creative work shall fall within the protection scope of the present invention.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0039] As Figure 1 , Figure 2 , Figure 3 , Figure 4 shown, a nodulizing treatment device for ductile iron production is provided, which includes a ladle 100, a molten iron delivery pipe 101, a bell jar 110, and a nitrogen tank 111. Among them, the nitrogen tank 111 is arranged on the upper surface of the bell jar 110, a feeding hopper 113 is fixed at the bottom of the bell jar 110, the molten iron delivery pipes 101 are symmetrically arranged, and the molten iron delivery pipe 101 penetrates through the ladle 100 and horizontally points to a valve mechanism 120 arranged inside the ladle 100. The valve mechanism 120 is impacted by the molten iron conveyed from the molten iron delivery pipe 101 as power. The valve mechanism 120 is used to control the feeding amount of the nodulizer in the feeding hopper 113 according to the conveyed amount of molten iron. An elastic nitrogen supplement mechanism 130 is connected above the valve mechanism 120. The nitrogen supplement mechanism 130 is respectively connected to the nitrogen tank 111 and a gas delivery pipe 140 that penetrates through the valve mechanism 120. The nitrogen supplement mechanism 130 supplies the nitrogen in the nitrogen tank 111 into the gas delivery pipe 140 by the up and down movement of the valve mechanism 120 to supplement the nitrogen lost in the bell jar 110 and limit the severity of the nodulizing reaction.

[0040] First, after the bell cover 110 fits with the ladle 100, add spheroidizing agent into the hopper 113 through the feeding port on the bell cover 110. Secondly, in order to prevent the molten iron from contacting the external air and improve the quality and performance of the spheroidized molten iron, a partition 112 fixedly connected to the bell cover 110 is provided at the bottom of the hopper 113. Notches on both sides of the partition 112 are used to accommodate the molten iron delivery pipe 101, and the partition 112 is sleeved inside the ladle 100. There is a gap between the outer diameter of the partition 112 and the inner diameter of the ladle 100. This gap allows nitrogen to form an air flow inside the ladle 100, restricting the contact between the molten iron and the external air. The molten iron under nitrogen protection is more likely to form a stable spherical graphite structure, thus improving the quality and performance of the spheroidized molten iron.

[0041] And the valve mechanism 120 in the normal state can restrict the descent of the spheroidizing agent in the hopper 113. On Figure 4 this basis and in combination with Figure 5 as shown, the specific structure of the valve mechanism 120 is disclosed. The valve mechanism 120 includes power plates 121 symmetrically distributed at the bottom. The two-sided power plates 121 enclose an inverted trapezoid. Each power plate 121 gradually inclines outward from the lower end towards the upper end, and the power plate 121 is used to block the molten iron conveyed by the molten iron delivery pipe 101, causing the power plate 121 to have a tendency to move upward. On the other hand, the valve mechanism 120 also includes a valve plate 122 with its edge turned up. In the normal state, the turned-up part of the valve plate 122 fits with the discharge port of the hopper 113, and the discharge port is blocked. A sleeve 123 is fixedly connected between the valve plate 122 and the power plate 121. The power plate 121, the valve plate 122, and the sleeve 123 are all penetrated by the gas delivery pipe 140. Utilize the impact of the molten iron on the power plate 121 to move the valve plate 122 upward to open the discharge port to control the feeding amount of the spheroidizing agent.

[0042] Regarding the impact force formed by the molten iron on the power plate 121, according to the decomposition of forces, the impact force of the molten iron will generate a component force that causes the power plate 121 to move upward, and this component force will cause the power plate 121 to have a tendency to move upward.

[0043] In addition, molten iron usually flows out from a blast furnace or other smelting equipment. The molten iron will be affected by various factors during the outflow process, such as changes in furnace temperature, mixing of slag, and pipeline blockage, etc. These will all lead to the discontinuity of the molten iron flow. Therefore, when the molten iron flows out from the power plate 121, the impact force on the power plate 121 is not constant.

[0044] In this way, when the impact force of the molten iron increases, the opening of the discharge port of the charging hopper 113 increases, and the amount of inoculant discharged increases. On the contrary, when the impact force of the molten iron weakens, the opening of the discharge port shrinks, and the amount of inoculant discharged decreases. In this way, the amount of inoculant discharged can be controlled according to the impact force of the molten iron, avoiding too much or too little discharge amount and affecting the effect of the spheroidizing reaction.

[0045] Furthermore, as the molten iron in the ladle 100 gradually increases, the nitrogen content in the ladle 100 decreases. As described above, the nitrogen replenishing mechanism 130 is used to replenish nitrogen into the bell 110 to inhibit the intensity of the spheroidizing reaction. Now, the specific structure of the nitrogen replenishing mechanism 130 will be publicly described. The nitrogen replenishing mechanism 130 includes a reciprocating pull rod 131 fixedly connected to the valve plate 122 at the bottom. A gas transmission cylinder 132 that penetrates the bell 110 and is fixedly connected to the bell 110 is sleeved and fitted at the top of the reciprocating pull rod 131. The top of the gas transmission cylinder 132 is communicated with the nitrogen tank 111. A first one-way valve for allowing nitrogen to enter the gas transmission cylinder 132 is provided at the connection between the gas transmission cylinder 132 and the nitrogen tank 111. A gas guide pipe communicating with the outside is provided on the gas transmission cylinder 132 near the reciprocating pull rod 131. The gas transmission cylinder 132 is communicated with the gas transmission pipe 140.

[0046] The process of replenishing nitrogen from the nitrogen tank 111 into the ladle 100 is divided into two processes, and the specific working principle is shown as follows:

[0047] The first stage: When the valve plate 122 moves upward, the first one-way valve is in the closed state, and external air is drawn into the gas guide pipe. The reciprocating pull rod 131 presses the nitrogen previously drawn into the gas transmission cylinder 132 into the gas transmission pipe 140 through the gas transmission cylinder 132. One end of the gas transmission pipe 140 is communicated with a through hole opened on the side wall of the bell 110, and the other end is flush with the lower edge of the partition plate 112 in the horizontal direction. A second one-way valve for allowing nitrogen in the ladle 100 to enter the gas transmission pipe 140 is provided in the through hole. Therefore, the nitrogen transported from the gas transmission cylinder 132 to the gas transmission pipe 140 will be transported into the ladle 100, so that when the molten iron reacts with the inoculant, a continuous nitrogen gas flow exists in the gap between the partition plate 112 and the inner wall of the ladle 100. Moreover, nitrogen is an inert gas and is not likely to chemically react with other substances. Therefore, when nitrogen is evenly distributed in the ladle 100, it can effectively prevent the molten iron from reacting with oxygen in the air, avoid oxidation of the molten iron, and the molten iron under nitrogen protection is more likely to form a stable spherical graphite structure, thereby improving the quality and performance of the spheroidized molten iron and reducing the generation of flue gas.

[0048] The second stage: When the valve plate 122 moves downward, the first one-way valve opens, and nitrogen in the nitrogen tank 111 is drawn into the gas transmission cylinder 132, and the air in the gas transmission cylinder 132 is discharged from the gas guide pipe. This process is the preparation stage for the first stage.

[0049] It should be noted that: the maximum displacement at the top of the reciprocating pull rod 131 is lower than the connection between the gas transmission cylinder 132 and the gas transmission pipe 140 in the horizontal direction, so as to prevent the reciprocating pull rod 131 from moving excessively in the reverse direction and sucking the nitrogen in the ladle 100 into the gas transmission pipe 140.

[0050] Considering that the nitrogen in the nitrogen tank 111 can only be pumped into the gas transmission cylinder 132 by relying on the gravity, a baffle 133 flush with the bottom of the gas transmission cylinder 132 is fixedly connected to the gas transmission pipe 140. An extension spring 150 is elastically connected between the bottom of the baffle 133 and the valve plate 122. The extension spring 150 is sleeved on the gas transmission pipe 140. Under normal conditions, the extension spring 150 is in a stretched state. That is to say, when the valve plate 122 moves upward, the molten iron overcomes the gravity and elastic potential energy to push the power plate 121 upward. When the valve plate 122 moves downward from top to bottom, the extension spring 150 uses its own elastic potential energy to push the valve plate 122 downward in the reverse direction, so as to pump the nitrogen in the nitrogen tank 111 into the gas transmission cylinder 132 through the reciprocating pull rod 131 for use.

[0051] In addition, when the spheroidizing agent in the hopper 113 drops, in order to make the spheroidizing agent evenly scatter in the molten iron and react with the molten iron, for this reason, returning to Figure 4 、 Figure 5 And combining Figure 6 、 Figure 7 And Figure 8 As shown, an opening and closing device for diffusing the spheroidizing agent is provided at the bottom of the hopper 113. Among them, the opening and closing device includes an outer blanking plate 160 whose outer edge fits the inner wall of the bell 110, and an inner blanking plate 170 located below the outer blanking plate 160 and fitting the outer blanking plate 160. The outer edge of the inner blanking plate 170 is fixedly connected to the inner wall of the bell 110. A plurality of blanking holes are provided on both the outer blanking plate 160 and the inner blanking plate 170. Under normal conditions, the blanking holes on the outer blanking plate 160 and the inner blanking plate 170 are in a staggered state. On the other hand, an outer sleeve ring 161 is coaxially connected to the top of the outer blanking plate 160. A wedge block 162 is fixedly connected to the inner wall of the outer sleeve ring 161. The wedge block 162 abuts against a convex block 124 fixed to the bottom of the valve plate 122. An inner sleeve ring 171 fixedly connected to the top of the inner blanking plate 170 is arranged inside the outer sleeve ring 161. A return spring 172 is elastically connected between the inner sleeve ring 171 and the wedge block 162, so that when the convex block 124 is separated from the wedge block 162, the elastic potential energy is used to make the blanking holes on the outer blanking plate 160 and the inner blanking plate 170 coincide.

[0052] During specific operation: when the valve plate 122 moves upward, the spheroidizing agent in the hopper 113 drops onto the outer blanking plate 160. At the same time, the convex block 124 is separated from the restriction on the wedge block 162, so that the outer blanking plate 160 rotates counterclockwise under the elastic action of the inner sleeve ring 171 (refer to Figure 7As shown, the material discharge holes on the outer material discharge plate 160 and the inner material discharge plate 170 are misaligned and overlapped. Specifically, according to the distance that the valve plate 122 moves upward, during this process, the spheroidizing agent rolls outward along the top of the outer material discharge plate 160 and evenly scatters into the molten iron through the material discharge holes, which is conducive to the formation and uniform distribution of graphite balls. On the contrary, when the injection of molten iron stops, the convex block 124 moves downward to squeeze the wedge block 162, causing the wedge block 162 to rotate clockwise to compress the return spring 172.

[0053] Furthermore, during specific use, the distance between the material discharge holes can be reduced to reduce the accumulation of the spheroidizing agent on the outer edge of the outer material discharge plate 160.

[0054] Secondly, when the material discharge holes are blocked, as the outer material discharge plate 160 rotates, the material discharge holes on the outer material discharge plate 160 and the inner material discharge plate 170 are gradually misaligned and overlapped. Since the velocity of the nitrogen gas discharged from the ladle 100 is small, the temperature inside the ladle 100 and the bell 110 is high, and the pressure is high, the nitrogen gas introduced into the ladle 100 through the gas transmission pipe 140 also has the function of backwashing and dredging the material discharge holes. Moreover, the nitrogen gas passing through the inner material discharge plate 170 and the outer material discharge plate 160 will also reverse-dredge the discharge port of the material hopper 113. Part of the nitrogen gas is guided by the gas transmission pipe 140 to circulate into the ladle 100, thereby reducing the waste of nitrogen gas.

[0055] Finally, when the spheroidizing reaction is completed, the bell 110 is lifted and the gas transmission pipe 140 is cleaned to prevent the remaining molten iron from blocking the gas transmission pipe 140.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A nodulizing treatment device for ductile iron production, characterized in that: It includes a molten iron ladle (100), a molten iron delivery pipe (101), a bell cover (110), and a nitrogen gas tank (111). Among them, the nitrogen gas tank (111) is arranged on the upper surface of the bell cover (110), and a feeding hopper (113) is fixed at the bottom of the bell cover (110). The molten iron delivery pipes (101) are symmetrically arranged. The molten iron delivery pipes (101) penetrate through the molten iron ladle (100) and horizontally point to a valve mechanism (120) arranged inside the molten iron ladle (100). The molten iron conveyed from the molten iron delivery pipes (101) is used as power to impact the valve mechanism (120). The valve mechanism (120) is used to control the feeding amount of the spheroidizing agent in the feeding hopper (113) according to the conveyed amount of molten iron. An elastic nitrogen gas supplement mechanism (130) is elastically connected above the valve mechanism (120). The nitrogen gas supplement mechanism (130) is respectively connected to the nitrogen gas tank (111) and an air delivery pipe (140) that penetrates through the valve mechanism (120). The nitrogen gas supplement mechanism (130) supplies the nitrogen gas in the nitrogen gas tank (111) into the air delivery pipe (140) by the up and down movement of the valve mechanism (120) to supplement the lost nitrogen gas in the bell cover (110) and limit the severity of the spheroidizing reaction; The valve mechanism (120) includes power plates (121) symmetrically distributed at the bottom. The two side power plates (121) enclose an inverted trapezoid. Each power plate (121) gradually inclines outward from the lower end to the upper end direction, and the power plates (121) are used to block the molten iron conveyed by the molten iron delivery pipes (101), so that the power plates (121) tend to move upward; The valve mechanism (120) further includes a valve plate (122) with its edge turned up. A baffle plate (133) flush with the bottom of the air delivery cylinder (132) is fixedly connected to the air delivery pipe (140). Under normal conditions, the turned-up part of the valve plate (122) fits with the discharge port of the feeding hopper (113). A sleeve (123) is fixedly connected between the valve plate (122) and the power plates (121). The power plates (121), the valve plate (122), and the sleeve (123) are all penetrated by the air delivery pipe (140). The molten iron impacts the power plates (121) to move the valve plate (122) upward to open the discharge port to control the feeding amount of the spheroidizing agent.

2. The nodulizing treatment device for ductile iron production according to claim 1, characterized in that: A partition plate (112) fixedly connected to the bell cover (110) is arranged at the bottom of the feeding hopper (113). The two sides of the partition plate (112) have notches for accommodating the molten iron delivery pipes (101), and the partition plate (112) is sleeved inside the molten iron ladle (100). There is a gap between the outer diameter of the partition plate (112) and the inner diameter of the molten iron ladle (100). This gap allows nitrogen gas to form an air flow inside the molten iron ladle (100) and restricts the contact between the molten iron and external air.

3. The spheroidizing treatment device for ductile iron production according to claim 1, characterized in that: The nitrogen replenishing mechanism (130) includes a reciprocating pull rod (131) whose bottom is fixedly connected to the valve plate (122). A gas delivery cylinder (132) that penetrates through and is fixedly connected to the bell jar (110) is sleeved and fitted on the top of the reciprocating pull rod (131). The top of the gas delivery cylinder (132) is communicated with a nitrogen tank (111). A first one-way valve for allowing nitrogen to enter the gas delivery cylinder (132) is provided at the connection between the gas delivery cylinder (132) and the nitrogen tank (111). An air duct communicating with the outside is provided on the gas delivery cylinder (132) near the reciprocating pull rod (131). The gas delivery cylinder (132) is communicated with a gas delivery pipe (140).

4. The nodulizing treatment device for ductile iron production according to claim 2, characterized in that: One end of the gas delivery pipe (140) is communicated with a through hole opened on the side wall of the bell jar (110), and the other end is flush with the lower edge of the partition plate (112) in the horizontal direction. A second one-way valve for allowing nitrogen in the molten iron ladle (100) to enter the gas delivery pipe (140) is provided in the through hole.

5. The nodulizing treatment device for ductile iron production according to claim 1, characterized in that: A tension spring (150) is elastically connected between the bottom of the baffle (133) and the valve plate (122). The tension spring (150) is sleeved on the gas delivery pipe (140). In the normal state, the tension spring (150) is in a stretched state.

6. The nodulizing treatment device for ductile iron production according to claim 1, characterized in that: An opening and closing device for diffusing the spheroidizing agent is provided at the bottom of the feeding hopper (113). Among them, the opening and closing device includes an outer feeding plate (160) whose outer edge fits the inner wall of the bell jar (110), and an inner feeding plate (170) located below the outer feeding plate (160) and fitting the outer feeding plate (160). The outer edge of the inner feeding plate (170) is fixedly connected to the inner wall of the bell jar (110). A plurality of feeding holes are provided on both the outer feeding plate (160) and the inner feeding plate (170). In the normal state, the feeding holes on the outer feeding plate (160) and the inner feeding plate (170) are in a staggered state.

7. The nodularizing treatment device for ductile iron production according to claim 6, characterized in that: The top of the outer feeding plate (160) is coaxially connected with an outer sleeve ring (161). A wedge block (162) is fixedly connected to the inner wall of the outer sleeve ring (161). The wedge block (162) abuts against a convex block (124) fixed to the bottom of the valve plate (122). An inner sleeve ring (171) fixedly connected to the top of the inner feeding plate (170) is provided inside the outer sleeve ring (161). A return spring (172) is elastically connected between the inner sleeve ring (171) and the wedge block (162) so that when the convex block (124) is separated from the wedge block (162), the feeding holes on the outer feeding plate (160) and the inner feeding plate (170) are made to coincide by using the elastic potential energy.

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