Nodular cast iron pressurizing spheroidizing device

Abstract

The utility model relates to a nodular cast iron pressurizing spheroidizing device which comprises a spheroidizing bag used for containing molten iron; the spheroidizing agent adding device is used for adding a spheroidizing agent into the spheroidizing bag; the sealing cover is used for sealing the spheroidizing bag and is provided with an inflation valve and a deflation valve, the inflation valve is used for introducing gas into the spheroidizing bag to increase the pressure in the spheroidizing bag, and the deflation valve is used for deflating the gas in the spheroidizing bag to enable the pressure in the spheroidizing bag to be smaller than a preset value; the locking mechanism is arranged between the sealing cover and the spheroidizing bag and used for enabling the contact face of the sealing cover and the contact face of the spheroidizing bag to be attached in a sealed mode so as to prevent gas and liquid from overflowing out of the spheroidizing bag. Nitrogen is introduced into the spheroidizing bag through the inflation valve, the pressure in the spheroidizing bag is increased, the diffusion speed of magnesium steam in molten iron is increased, the more uniform spheroidizing effect is ensured, and the product quality is improved. When the pressure in the spheroidizing bag reaches a preset value, the pressure is released through the deflation valve, and the sealing cover and the connecting assembly are prevented from being damaged due to overlarge pressure.

Description

Technical Field

[0001] The utility model belongs to the technical field of spheroidizing ductile iron, and in particular relates to a spheroidizing device for pressurizing ductile iron. Background Art

[0002] In conventional grey cast iron, graphite exists in the form of flakes, which limits the mechanical properties of the material, such as ductility and toughness. Through spheroidization, the morphology of graphite can be changed to become spherical or nearly spherical, thereby significantly improving the strength, toughness and plasticity of cast iron. In the prior art, the closure cover is directly added to the spheroidizing bag, and the pressure in the spheroidizing bag only comes from the gas generated during the spheroidization of the spheroidizing agent. The pressure is low, the diffusion rate of magnesium vapor in molten iron is slow, the spheroidization efficiency is low and the spheroidization is uneven, which affects the product quality. Utility Model Content

[0003] The utility model provides a ductile iron pressure spheroidizing device to solve the technical problem that the pressure in the spheroidizing bag is low and the product quality is affected during the spheroidizing process.

[0004] In order to solve the above problems, the utility model adopts the following technical solutions:

[0005] A ductile iron pressure spheroidizing device, comprising:

[0006] Spheroidizing ladle, used to hold molten iron;

[0007] A spheroidizing agent adding device, used for adding the spheroidizing agent into the spheroidizing bag;

[0008] A closing cover is used to close the spheroidizing bag and is provided with an inflation valve and an air release valve. The inflation valve is used to introduce gas into the spheroidizing bag to increase the pressure in the spheroidizing bag, and the air release valve is used to release the gas in the spheroidizing bag to make the pressure in the spheroidizing bag less than a predetermined value.

[0009] The locking mechanism is arranged between the closing cover and the spheroidizing bag, and is used to make the contact surfaces of the closing cover and the spheroidizing bag seal and fit together to prevent gas and liquid from overflowing from the spheroidizing bag.

[0010] The beneficial effects are: nitrogen is introduced into the spheroidizing bag through the inflation valve to increase the pressure in the spheroidizing bag, enhance the diffusion rate of magnesium vapor in molten iron, ensure a more uniform spheroidizing effect, and improve product quality; when the pressure in the spheroidizing bag reaches a predetermined value, the pressure is released through the vent valve to prevent the closing cover and the connecting components from being damaged due to excessive pressure.

[0011] Furthermore, the spheroidizing agent adding device is movably assembled on the closing cover along the up and down directions.

[0012] Furthermore, the closing cover is provided with a telescopic device which can be telescopic in the up and down directions, and the spheroidizing agent adding device is detachably connected to the output end of the telescopic device.

[0013] Beneficial effects: By moving the spheroidizer adding device up and down, the spheroidizer can be evenly dispersed in the molten iron, avoiding local excess, more effectively utilizing the spheroidizer and reducing material waste; the detachable connection design facilitates the replacement of the spheroidizer adding device.

[0014] Furthermore, a sealing component is provided between the contact surface of the spheroidizing bag and the sealing cover. The sealing component is a plurality of coaxial annular flexible parts whose diameters gradually increase from top to bottom. The plurality of annular flexible parts are arranged up and down in a cone shape.

[0015] Beneficial effect: The use of multiple annular flexible parts for sealing provides a redundancy mechanism. Even if one layer of sealing fails, the subsequent sealing layer can still maintain the sealing of the contact surface, thereby improving the overall reliability.

[0016] Furthermore, the plurality of annular flexible members include rubber rings and packings, the rubber rings are in plurality, and the packings are located between two adjacent rubber rings.

[0017] Beneficial effects: The rubber ring has good elasticity, can absorb vibration, protect the packing seal in the middle from mechanical damage, and extend its service life. At the same time, the packing seal can provide support for the rubber ring to prevent the rubber ring from permanent deformation due to long-term pressure; multiple sealing components are arranged in a conical shape, which increases the distance and difficulty of fluid or gas leakage from the high-pressure area to the low-pressure area. At the same time, the conical arrangement can better distribute pressure and better adapt to axial movement.

[0018] Furthermore, a convex edge is provided on the outer peripheral surface of the spheroidizing bag, and the locking mechanism includes a plurality of motors fixed on the top surface of the closing cover and a rotating hook fixed on the output shaft of the motor, and the rotating hook rotates away from one end of the motor output shaft and presses against the bottom end surface of the convex edge, so that the closing cover and the spheroidizing bag are fixedly connected and the sealing assembly is compressed.

[0019] Beneficial effects: the closing cover is fixed by a rotating hook fixed on the motor output shaft, the entire spheroidizing device has a compact structure, and additional supporting mechanisms are reduced.

[0020] Furthermore, an annular baffle extending up and down is fixedly arranged on the edge of the closing cover, and an annular groove with an opening at the lower end is formed on the inner circumference of the annular baffle, the inner top surface of the closing cover, and the outer circumference of the spheroidizing bag.

[0021] Beneficial effect: When the spheroidizing package leaks, the leaked gas and liquid flow downward under the restriction of the ring groove, and the gas and liquid will not splash around, thus protecting the safety of personnel.

[0022] Furthermore, the inner bottom surface of the spheroidizing bag is a curved surface that bends downward, and the inner top surface of the closing cover is a curved surface that bends upward.

[0023] Beneficial effects: The curved surface can reduce stress concentration, reduce dead angles, and facilitate cleaning and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model.

[0025] Among them, 1. spheroidizing bag; 2. spheroidizing agent adding device; 3. closing cover; 4. inflation valve; 5. deflation valve; 6. telescopic device; 7. connecting rod; 8. annular baffle; 9. rubber ring; 10. packing; 11. convex edge 1; 12. convex edge 2; 13. motor; 14. rotating hook. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0027] A ductile iron pressure spheroidizing device comprises: a spheroidizing bag 1, a spheroidizing agent adding device 2, a closing cover 3, a sealing component and a locking mechanism.

[0028] The spheroidizing bag 1 is a hollow columnar structure with an open top, extending up and down, and an inner bottom surface being a downwardly curved arc surface, and is made of a pressure-resistant material for containing molten iron;

[0029] The spheroidizing agent adding device 2 is preferably a magnesium spray gun, which is located in the spheroidizing bag 1 and has a spheroidizing agent built therein, and is used to add the spheroidizing agent to the molten iron in the spheroidizing bag 1;

[0030] The closing cover 3 is made of a pressure-resistant material, and the inner top surface is an arc-shaped surface convex upward. An inflation valve 4 and an air release valve 5 are installed on the closing cover 3. A telescopic device 6 that can be telescopic in the up and down directions is installed on the closing cover 3. The telescopic device 6 can be an electric push rod or a hydraulic rod. The fixed end of the telescopic device 6 is fixedly installed on the top surface of the closing cover 3. The working end of the telescopic device 6 vertically passes through the closing cover 3 and is connected to the spheroidizing agent adding device 2 through a connecting rod 7 extending up and down. The two ends of the connecting rod 7 are respectively connected to the working end of the telescopic device 6 and the spheroidizing agent adding device 2 through bolts, nuts or buckles. Of course, in other embodiments, a non-telescopic method can also be used to realize the lifting and lowering of the spheroidizing agent adding device, such as rotating an assembly gear on the top surface of the closing cover 3, a vertical rack is meshed on the gear, the top end of the connecting rod 7 extends out of the closing cover 3 and is detachably connected to the bottom end of the rack through bolts, nuts or buckles, and the middle part of the connecting rod 7 is slidably sealed with the closing cover 3. The edge of the closing cover 3 is fixed with an annular baffle 8 extending up and down, and the inner circumference of the annular baffle 8, the inner top surface of the closing cover 3, and the outer circumference of the spheroidizing bag 1 form an annular groove with an opening at the lower end. The closing cover 3 is fixedly installed on the spheroidizing bag 1 to close the spheroidizing bag 1.

[0031] The sealing assembly is three coaxial annular flexible parts with different diameters. In this embodiment, the annular flexible parts include two rubber rings 9 and a packing 10. The two rubber rings 9 and the packing 10 are coaxial and their diameters gradually increase from top to bottom. The packing 10 is located between the two rubber rings 9. The two rubber rings 9 and the packing 10 are arranged in a cone. Figure 1 As shown, a circular annular convex edge 11 coaxial with the spheroidizing bag 1 is fixedly provided on the outer circumference of the spheroidizing bag 1, a circular annular convex edge 12 coaxial with the closure cover 3 is fixedly provided on the closure cover 3, and a sealing component is located between the convex edge 11 and the convex edge 12. The sealing component is fixed on the top surface of the convex edge 11 or the bottom surface of the convex edge 12 by means of adhesive or the like, and a slot adapted to the sealing component is provided on the corresponding convex edge 12 or the convex edge 11. The annular baffle 8 is fixedly installed on the edge of the convex edge 12, and an annular groove with an opening at the lower end is formed on the inner circumference of the annular baffle 8, the top surface of the convex edge 12, the bottom surface of the convex edge 11, and the outer circumference of the spheroidizing bag 1.

[0032] The locking mechanism includes a motor 13 and a rotating hook 14. There are 8 motors 13, which are evenly fixed on the closing cover 3 in a circular shape. Fixed studs can be vertically welded on the closing cover 3 as positioning pins. Positioning holes that match the studs are opened on the base of the motor 13. After the studs pass through the positioning holes, nuts are installed to complete the fixation of the motor 13; the rotating hook 14 is made of steel and is fixedly installed on the output shaft of the motor 13.

[0033] The usage of this device is:

[0034] The spheroidizing agent adding device 2 is connected to the working end of the telescopic device 6 through the connecting rod 7. Since the two ends of the connecting rod 7 are detachably connected to the spheroidizing agent adding device 2 and the working end of the telescopic device 6, the spheroidizing agent adding device 2 is easy to replace, and the length of the connecting rod 7 is convenient to adjust to various depths of the spheroidizing bag 1. Add molten iron of a predetermined temperature into the spheroidizing bag 1, install the closing cover 3, insert the sealing component into the corresponding card slot, start the motor 13, and the output shaft of the motor 13 drives the rotating hook 14 to rotate. The rotating hook 14 rotates away from the end of the output shaft of the motor 13 and presses the bottom end surface of the convex edge 11, so that the closing cover 3 and the spheroidizing bag 1 are fixedly connected and the sealing component is pressed. The contact surface of the closing cover 3 and the spheroidizing bag 1 is sealed and fitted, effectively preventing gas and liquid from overflowing the spheroidizing bag 1. The telescopic device 6 is controlled to extend and shorten, and the spheroidizing agent adding device 2 moves up and down in the molten iron, so that the spheroidizing agent is evenly dispersed in the molten iron; when the spheroidizing agent reacts with the molten iron, the air inlet valve is used to introduce nitrogen into the spheroidizing bag 1 to increase the pressure in the spheroidizing bag 1, enhance the diffusion rate of magnesium vapor in the molten iron, and ensure a more uniform spheroidizing effect; when the pressure in the spheroidizing bag 1 is higher than a predetermined value, the air release valve 5 automatically opens to release the pressure to prevent the spheroidizing bag 1 from being overly high, causing damage to the closing cover 3 and the connecting components.

Claims

1. A ductile iron pressure spheroidizing device, characterized in that: include: A spheroidizing bag (1) for containing molten iron; A spheroidizing agent adding device (2), used for adding the spheroidizing agent into the spheroidizing bag (1); A closing cover (3) is used to close the spheroidizing bag (1) and is provided with an inflation valve (4) and an air release valve (5). The inflation valve (4) is used to introduce gas into the spheroidizing bag (1) to increase the pressure in the spheroidizing bag (1), and the air release valve (5) is used to release the gas in the spheroidizing bag (1) to make the pressure in the spheroidizing bag (1) less than a predetermined value. The locking mechanism is arranged between the closing cover (3) and the spheroidizing bag (1) and is used to seal the contact surfaces of the closing cover (3) and the spheroidizing bag (1) to prevent gas and liquid from overflowing from the spheroidizing bag (1).

2. A ductile iron pressure spheroidizing device according to claim 1, characterized in that: The spheroidizing agent adding device (2) is movably mounted on the closing cover (3) in the up and down directions.

3. A ductile iron pressure spheroidizing device according to claim 2, characterized in that: The closing cover (3) is provided with a telescopic device (6) that can be telescoped in the up and down directions, and the spheroidizing agent adding device (2) is detachably connected to the output end of the telescopic device (6).

4. A ductile iron pressure spheroidizing device according to claim 3, characterized in that: A sealing component is provided between the contact surfaces of the spheroidizing bag (1) and the sealing cover (3), wherein the sealing component is a plurality of coaxial annular flexible parts whose diameters gradually increase from top to bottom, and the plurality of annular flexible parts are arranged up and down in a cone shape.

5. A ductile iron pressure spheroidizing device according to claim 4, characterized in that: The plurality of annular flexible parts include rubber rings (9) and packings (10). The rubber rings (9) are in plurality, and the packings (10) are located between two adjacent rubber rings (9).

6. A ductile iron pressure spheroidizing device according to claim 5, characterized in that: The spheroidizing bag (1) is provided with a convex edge (11) on its outer peripheral surface, and the locking mechanism comprises a plurality of motors (13) fixedly mounted on the top surface of the closing cover (3) and a rotating hook (14) fixedly mounted on the output shaft of the motor (13), wherein the rotating hook (14) rotates with one end away from the output shaft of the motor (13) and presses against the bottom end surface of the convex edge (11), so that the closing cover (3) and the spheroidizing bag (1) are fixedly connected and the sealing component is pressed.

7. A ductile iron pressure spheroidizing device according to claim 6, characterized in that: An annular baffle (8) extending up and down is fixedly arranged on the edge of the closing cover (3); the inner circumference of the annular baffle (8), the inner top surface of the closing cover (3) and the outer circumference of the spheroidizing bag (1) form an annular groove with an opening at the lower end.

8. A ductile iron pressure spheroidizing device according to any one of claims 2 to 7, characterized in that: The inner bottom surface of the spheroidizing bag (1) is a curved surface that bends downward, and the inner top surface of the closing cover (3) is a curved surface that bends upward.

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