Turbine type nucleating agent mixing device

Abstract

The invention discloses a turbo-type inoculant mixing device which comprises a sprue cup, a liquid guide pipe, a shrinkage pipe, a throat pipe and a liquid outlet pipe, a direct sprue of the sprue cup is communicated with the shrinkage pipe through the liquid guide pipe, the throat pipe is communicated below the shrinkage pipe, and the liquid outlet pipe is communicated below the throat pipe; the throat pipe is in a turbine type, a turbine device is arranged in the throat pipe, the turbine device is composed of a center supporting cylindrical frame, cone frames and turbine blades, the cone frames are connected to the upper portion and the lower portion of the center supporting cylindrical frame respectively, and the turbine blades are fixed to the outer wall of the center supporting cylindrical frame and fixed to the inner wall of the throat pipe. The problem that a nucleating agent and molten metal are not mixed uniformly is solved, it is ensured that the nucleating agent is completely molten by the molten metal and uniformly absorbed, the effect of the nucleating agent is fully played, and the quality of casting products is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of smelting and casting equipment, and in particular relates to a turbine inoculant mixing device. Background Art

[0002] Large-sized castings are prone to uneven microstructures during the casting process, which has a great impact on the quality of the product. The inoculant has the function of refining the matrix structure. In order to ensure the consistency of the casting structure and the quality of the product, it is usually necessary to inoculate it during the casting process of large castings. Inoculation treatment is to add a trace amount of inoculant to the liquid metal to promote its nucleation, inhibit its growth, and achieve grain refinement. At present, the main ways of adding inoculants are direct addition and core addition. The direct addition method is to put the inoculant directly into the molten metal and let it disperse in the metal, but it cannot guarantee that the inoculant is evenly mixed in the molten metal; the core addition method is to wrap the inoculant in a core, and then put the core into the molten metal to release the inoculant and disperse it in the metal. This method is greatly affected by human factors, and is time-consuming and labor-intensive, and the role of the inoculant cannot be fully exerted.

[0003] The above method is a common inoculant treatment method, but it is difficult to ensure that the inoculant and the molten metal are completely and evenly mixed, and it is impossible to ensure that the role of the inoculant is effectively exerted. Therefore, it is urgent to solve the problem of uneven mixing of the inoculant and the molten metal, so as to improve the quality of large castings. Summary of the invention

[0004] In view of the problem of uneven mixing of the inoculant and the molten metal in the prior art, the present invention provides a turbine inoculant mixing device to solve the problem that the inoculant cannot be evenly distributed in the molten metal under the above background technology, so that the inoculant is evenly dispersed in the molten metal.

[0005] The object of the present invention is achieved in the following manner: A turbine-type inoculant mixing device comprises a pouring cup, a liquid guide tube, a contraction tube, a throat and a liquid outlet pipe. The direct pouring port of the pouring cup is connected to the contraction tube through the liquid guide tube, the lower part of the contraction tube is connected to the throat, and the lower part of the throat is connected to the liquid outlet pipe. The throat is a turbine-type and is provided with a turbine device. The turbine device consists of a central supporting cylindrical frame, a conical frame and turbine blades. The upper and lower parts of the central supporting cylindrical frame are respectively connected to a conical frame. The turbine blades are fixed to the outer wall of the central supporting cylindrical frame and to the inner wall of the throat.

[0006] The liquid outlet pipe is a diffusion pipe or a contraction pipe.

[0007] The lower end of the liquid outlet pipe is connected to the outlet circular pipe.

[0008] The inclination angle of the turbine blades is 30°≤α≤45°.

[0009] The inclined length of the turbine blade is 10mm≤L≤30mm.

[0010] The number of turbine blades is 6-12.

[0011] The pouring cup is gourd-shaped.

[0012] The liquid guiding tube is connected to the upper shrink tube via a fastening ring.

[0013] The invention has the advantages of simple structure, convenient operation and low cost. The pouring cup is in a gourd shape, and the protruding part in the middle of the pouring cup can filter the residue in the molten metal. The cross-sectional area of ​​the contraction tube outlet is reduced, and the flow velocity of the molten metal is accelerated when flowing through, which can enhance the vortex effect formed subsequently; the molten metal with a changed flow velocity flows into the throat pipe, and its streamline is twisted and changed when flowing through the turbine device. At the same time, affected by the shape and structure of the turbine device, the flow velocity of the molten metal is further accelerated, and the turbulence of the liquid is increased. After flowing through the turbine blades, a vortex is formed. Under the action of the rotating vortex generated by flowing through the turbine, the mixing process of the inoculant and the molten metal can be enhanced. This rotating vortex increases the turbulence level inside the liquid, which helps to achieve a more uniform distribution of the inoculant particles in the molten metal; the liquid vortex formed by the molten metal under the action of the turbine device then flows through the liquid outlet pipe and finally flows into the sprue. In this process, the flow path of the vortex is long, and the inoculant and the molten metal have sufficient time to be evenly mixed under the action of the vortex. In the sprue, the vortex further promotes the uniform mixing of the inoculant and the molten metal. Finally, the inoculant is fully melted and uniformly absorbed by the molten metal. The special structure composed of the contraction tube, the throat and the liquid outlet pipe leads to a large flow rate at the throat, and the inoculant quickly passes through the throat and the turbine device, preventing the inoculant from adhering to the inner wall of the throat or the turbine device. Compared with the traditional flow-following method, the turbine-type inoculant mixing device disclosed in the present invention can ensure that the inoculant is completely melted and uniformly absorbed by the molten metal, which can give full play to the role of the inoculant and improve the quality of the casting product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention in which the liquid outlet pipe is a diffusion pipe.

[0015] Figure 2 It is a structural schematic diagram of the present invention in which the liquid outlet tube is a shrink tube.

[0016] Figure 3 It is a structural diagram of a pouring cup.

[0017] Figure 4 It is a schematic diagram of the structure of the throat.

[0018] Figure 5 It is a schematic diagram of the structure of the turbine inside the throat.

[0019] In the figure, 1, pouring cup; 2, liquid guide tube; 21, fastening ring; 4, shrink tube; 5, throat; 6, turbine device; 61, center supporting cylindrical frame; 62, cone frame; 611, turbine blade; 7, liquid outlet pipe; 8, outlet circular pipe. DETAILED DESCRIPTION

[0020] In order to make the technical solution and advantages of the present invention more clearly presented, the present invention is described more clearly and in detail below with reference to the accompanying drawings and through specific embodiments. The described embodiments are only part of the embodiments designed by the present invention, not all embodiments.

[0021] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, a turbine-type inoculant mixing device comprises a pouring cup 1, a liquid guide tube 2, a contraction tube 4, a throat 5 and a liquid outlet pipe 7. The straight pouring port of the pouring cup 1 is connected to the contraction tube 4 through the liquid guide tube 2, the contraction tube 4 is connected to the throat 5 below, and the throat 5 is connected to the liquid outlet pipe 7 below; the throat 5 is a turbine type, and is provided with a turbine device 6 therein, the turbine device 6 is composed of a central supporting cylindrical frame 61, a conical frame 62 and a turbine blade 611, the central supporting cylindrical frame 61 is connected to a conical frame 62 above and below, the turbine blade 611 is fixed to the outer wall of the central supporting cylindrical frame 61, and is fixedly connected to the inner wall of the throat 5. The conical structure of the conical frame 62 can guide the molten metal. In addition, the existence of the conical structure will disturb the streamline of the molten metal. When the molten metal flows through the conical frame 62, due to its shape characteristics, the streamline will be twisted, which will promote the formation of liquid vortex. At the same time, the conical frame 62 reduces the flow space of the liquid. The molten metal flows from the contraction tube 4, and the fluid will further accelerate the flow at the conical frame 62 to adapt to the gradually narrowing channel.

[0022] In a further preferred embodiment, the liquid outlet pipe 7 is a diffusion pipe with a smaller diameter at the top and a larger diameter at the bottom, or a contraction pipe with a larger diameter at the top and a smaller diameter at the bottom.

[0023] like Figure 1As shown, when the liquid outlet pipe 7 is a diffuser with a small diameter at the top and a large diameter at the bottom, the special structure composed of the contraction tube, the throat and the diffuser leads to the maximum flow rate at the throat, and the inoculant quickly passes through the throat and the turbine device to prevent the inoculant from adhering to the inner wall of the throat or the turbine device; at the same time, the special structure composed of the contraction tube, the throat and the diffuser will form a local negative pressure area at the throat position when the liquid flows through, and the negative pressure area can attract the entry of the inoculant and promote the mixing of the inoculant and the molten metal; this structure is also helpful to separate the bubbles from the liquid and remove the gas in the liquid, specifically: when the molten metal flows into the throat from the contraction tube, the liquid flow rate increases, the increase in flow rate will cause the pressure to decrease, the gas will be released from the liquid to form bubbles, and when the molten metal flows into the diffuser, the pressure is restored, the bubbles will separate from the molten metal and rise to the negative pressure area, thereby discharging the bubbles out of the system and reducing the bubble content in the molten metal. After flowing through the turbine blades 611, when the molten metal continues to flow through the diffuser, the molten metal may slow down to adapt to the widened pipe. The change and gradient of the molten metal flow rate caused after passing through the contraction pipe and the liquid outlet pipe help to further promote the continued formation of vortices and the enhancement of the vortex effect.

[0024] like Figure 2 As shown, when the liquid outlet pipe 7 is a contraction tube with a larger diameter at the top and a smaller diameter at the bottom, the flow velocity increases after the liquid passes through the first contraction tube, and then the flow velocity further increases when it passes through the second contraction tube. The periodic change of the flow velocity will enhance the formation effect of the vortex and help mix the liquid and the inoculant.

[0025] Furthermore, the lower end of the liquid outlet pipe 7 is connected to an outlet circular pipe 8, and the diameter of the outlet circular pipe 8 is adapted to the sprue, which is more conducive to the inoculant and the molten metal entering the sprue.

[0026] In a further preferred embodiment, the pouring cup 1 is gourd-shaped. Figure 3 The pouring cup 1 has a solution pool and a sprue. The molten metal is poured into the pouring cup from the end away from the sprue. The gourd-shaped middle protrusion can filter the residue in the molten metal. The molten metal flows downward from the sprue into the liquid guide pipe 2.

[0027] The liquid guiding tube 2 and the upper shrink tube 4 are connected via a fastening ring 21, so as to achieve installation stability between the tubes during operation.

[0028] The inclination angle of the turbine blade 611 is 30°≤α≤45°. As the inclination angle of the turbine blade 611 increases, the rotation speed of the molten metal will increase after flowing through the turbine blade, thereby increasing the diameter of the vortex formed, enhancing the vortex effect, and improving the fluid mixing effect.

[0029] The inclined length of the turbine blade 611 is 10 mm ≤ L ≤ 30 mm. The increase in the inclined length of the turbine blade can increase the turbulence effect of the blade on the molten metal, thereby enhancing the eddy current intensity; in addition, the increase in the inclined length of the blade can adjust the diameter of the eddy current, and a longer blade will form a eddy current with a larger diameter to enhance the eddy current effect.

[0030] The number of turbine blades 611 is 6 to 12. Properly increasing the number of turbine blades will increase the turbulence of the liquid, improve the eddy effect, and thus enhance the mixing effect of the molten metal and the inoculant, but too many turbine blades may reduce the speed of the eddy current, increase the resistance that the liquid needs to overcome when flowing through the blades, and increase energy consumption.

[0031] The present invention has a simple structure, convenient operation and low cost. During casting, the molten metal is poured from the pouring cup, wherein the middle protrusion of the gourd-shaped pouring cup acts as a filter, which can effectively remove inclusions and residues in the molten metal. The molten metal flows into the straight gate from the solution pool of the pouring cup 1, and then the molten metal enters the contraction tube 4 through the liquid guide tube 2. As the cross-sectional area of ​​the contraction tube 4 is reduced, the flow rate of the molten metal is increased to adapt to the pipeline with a gradually reduced cross-sectional area. The increased liquid flow rate leads to an increase in the turbulence of the liquid after passing through the throat 5, which can promote the formation of vortices and enhance the vortex effect; subsequently, the molten metal with an accelerated flow rate after passing through the contraction tube 4 flows into the throat 5, in which a turbine device 6 is arranged. The molten metal is affected by the conical frame 62 and the turbine blades 611, and the liquid streamlines are twisted and changed, and finally flow through the turbine blades 61. 1, and then a vortex is formed. Under the action of the rotating vortex, the mixing process of the inoculant and the molten metal is strengthened. This rotating vortex increases the turbulence level inside the liquid, which helps to achieve a more uniform distribution of the inoculant particles in the molten metal. The liquid vortex formed by the molten metal under the action of the turbine device then flows through the liquid outlet pipe and finally flows into the sprue. In this process, the flow path of the vortex is long, and the inoculant and the molten metal are uniformly mixed for a sufficient time under the action of the vortex. In the sprue, the vortex further promotes the uniform mixing of the inoculant and the molten metal. Finally, the inoculant is fully melted and uniformly absorbed by the molten metal.

[0032] The special structure composed of the contraction tube, throat and liquid outlet pipe causes the liquid flow velocity at the throat to be greater than the initial velocity, and the inoculant passes through the throat and turbine device quickly, preventing the inoculant from adhering to the inner wall of the throat or the turbine device.

[0033] Compared with the traditional flow-following method, the inoculant added by the mixing device disclosed in the present invention can be completely melted and uniformly absorbed by the molten metal, which can give full play to the role of the inoculant and improve the quality of the casting product. In addition, since the turbine blades inside the turbine throat can change the inclination angle, the blade inclination length and the number of blades, the vortex effect of the molten metal after flowing through the blades can be controlled, and the uniform mixing effect of the inoculant and the molten metal can be controlled, further ensuring that the inoculant is uniformly mixed with the molten metal, the inoculant is fully melted and uniformly absorbed, and the quality of the casting is guaranteed.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several changes and improvements can be made without departing from the overall concept of the present invention, which should also be regarded as the scope of protection of the present invention.

Claims

1. A turbine inoculant mixing device, Features: The invention comprises a pouring cup (1), a liquid guide tube (2), a contraction tube (4), a throat tube (5) and a liquid outlet tube (7); the straight pouring port of the pouring cup (1) is connected to the contraction tube (4) through the liquid guide tube (2); the contraction tube (4) is connected to the throat tube (5) at the bottom; the throat tube (5) is connected to the liquid outlet tube (7) at the bottom; the throat tube (5) is of turbine type and is provided with a turbine device (6) therein; the turbine device (6) is composed of a central supporting cylindrical frame (61), a conical frame (62) and a turbine blade (611); the central supporting cylindrical frame (61) is connected to a conical frame (62) at the top and the bottom; the turbine blade (611) is fixed to the outer wall of the central supporting cylindrical frame (61) and is fixed to the inner wall of the throat tube (5).

2. The turbine inoculant mixing device according to claim 1, Features: The liquid outlet pipe (7) is a diffusion pipe or a contraction pipe.

3. The turbine inoculant mixing device according to claim 2, Features: The lower end of the liquid outlet pipe (7) is connected to the outlet circular pipe (8).

4. The turbine inoculant mixing device according to claim 1, Features: The inclination angle of the turbine blade (611) is 30°≤α≤45°.

5. The turbine inoculant mixing device according to claim 1, Features: The inclined length of the turbine blade (611) is 10 mm ≤ L ≤ 30 mm.

6. The turbine inoculant mixing device according to claim 1, Features: The number of turbine blades (611) is 6-12.

7. The turbine inoculant mixing device according to claim 1, Features: The pouring cup (1) is gourd-shaped.

8. The turbine inoculant mixing device according to claim 1, Features: The liquid guiding tube (2) and the upper shrink tube (4) are connected via a fastening ring (21).

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