A variable diameter gate device

Abstract

A variable diameter gate device belongs to the technical field of casting equipment. The present invention mainly solves the technical problems existing in the gate device of the existing progressive pouring and solidification molding device, such as the single structure, the inability to adjust the casting radius, and the complicated operation process. The technical scheme of the present invention is: including a gate sleeve, a gate cup, a rotating disk, a rotating shaft and a stepper motor; the gate sleeve is arranged at the top inlet of the crystallizer, and the lower part of the outer wall of the gate sleeve is a conical structure with a larger upper part and a smaller lower part; a cylindrical cavity is arranged in the middle of the gate sleeve, the diameter of the rotating disk is consistent with the inner diameter of the cavity, and the rotating disk is arranged horizontally at the bottom of the cavity; the gate cup is arranged on one side of the top surface of the gate sleeve, and the stepper motor is vertically installed in the middle of the top surface of the gate sleeve through a bracket. The present invention has the advantages of adjustable pouring area, simple operation, and high work efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of casting equipment, and specifically relates to a variable diameter gate device. Background Art

[0002] In recent years, China's heavy equipment manufacturing industry has developed rapidly, and there is a strong demand for large forgings, especially in nuclear power equipment, which represents the highest level of large forgings. The steel used in this type of product is generally produced from large ingots through processes such as blanking and forging, and its quality is closely related to the quality of the ingots. To obtain high-quality forgings, it is necessary to control the inherent quality defects in the ingots, such as segregation, shrinkage, inclusions, etc.

[0003] In order to solve these problems, a new type of progressive pouring and solidification technology for large steel ingots (billets) has been proposed, see the invention patent "Progressive solidification forming method for large steel ingots or steel billets" (patent number 201811050552.8). The working principle of the progressive pouring and solidification technology described in the patent is: according to the principle of discrete stacking in additive manufacturing, through solid ingot pouring + cladding layer coating, after cooling and solidification, the shape and size of the steel ingot (billet) that meets the manufacturing requirements are gradually formed. The specific operation includes gradually injecting the molten metal into templates of different sizes, and using the steel ingot cast in the previous step as the ingot core of the next step, and then continuously pouring the molten metal around the new ingot core, and repeating the operation in a cycle, and finally accumulating to form a steel ingot that meets the target size. The use of this technology can achieve the goals of product diversity and flexible production. It can significantly reduce the number and degree of defects in large-sized steel ingots (billets), greatly improve the performance and quality of steel ingots (billets), and can also be used to produce various unconventional castings, such as square and round, and other unconventional castings with fluctuating diameters on the axis.

[0004] Based on this technology, a new type of gate device is urgently needed, which can not only meet the needs of filling, but also cooperate with subsequent crystallizers with different inner diameters. However, from the currently disclosed patents, the existing gate device structures are relatively simple, with only a fixed casting radius, and cannot be used in conjunction with crystallizers of different sizes in the progressive casting and solidification molding device. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a variable diameter gate device to solve the technical problems of the gate device in the existing progressive casting and solidification molding device, such as a single structure, inability to adjust the casting radius, and complex operation process.

[0006] In order to solve the above problems, the technical solution of the present invention is: a variable diameter gate device, which includes a gate sleeve, a gate cup, a rotating disk, a rotating shaft and a stepping motor; the gate sleeve is arranged at the top inlet of the crystallizer, and the lower part of the outer wall of the gate sleeve is a tapered structure with a larger upper part and a smaller lower part; a cylindrical cavity is arranged in the middle of the gate sleeve, the diameter of the rotating disk is consistent with the inner diameter of the cavity, and the rotating disk is horizontally arranged at the bottom of the cavity; the gate cup is arranged on one side of the top surface of the gate sleeve, and the stepping motor is vertically installed in the middle of the top surface of the gate sleeve through a bracket;

[0007] An ingrate and a cross runner are provided in the sprue sleeve on one side of the cavity, a liquid inlet at the top of the ingrate is connected to a sprue cup provided on the top surface of the sprue sleeve, and a bottom of the ingrate is connected to the cavity above the rotating disk through the cross runner;

[0008] A rotating shaft through hole is provided in the middle of the top surface of the gate sleeve, one end of the rotating shaft passes through the rotating shaft through hole and is connected to the middle of the top surface of the rotating disk, and the other end of the rotating shaft is connected to the power output end of the stepping motor;

[0009] The rotating disk is provided with a plurality of groups of spray holes evenly arranged along concentric circles of different diameters, and the spray holes are arranged in a cross shape; the bottom of the sprue sleeve is provided with a plurality of groups of rotating holes evenly arranged along concentric circles of different diameters at positions corresponding to the spray holes, and the rotating holes are arranged in a non-cross shape; the rotating disk and the sprue sleeve rotate relative to each other so that only one group of spray holes on the same diameter is connected to the rotating holes.

[0010] Furthermore, connecting lugs are provided on both sides of the sprue sleeve.

[0011] The present invention adopts the above-mentioned technical scheme. Through the setting of the rotating disk, the molten metal can be continuously injected into the crystallizer cavity in the form of a thin stream from runners of different diameters. The impact force is small, slag and inclusions are not easy to adhere to the side wall, exhaust is convenient, and sequential solidification is good. It perfectly cooperates with layered pouring and layer-by-layer stacking, and can achieve rapid solidification and layer-by-layer stacking, thereby effectively reducing or even avoiding internal quality problems of large ingots such as macro-porosity shrinkage cavities, macro-segregation, coarse structure, etc., and provides technical support for the production of high-quality large castings.

[0012] Compared with the prior art, the invention has the advantages of reasonable structural design, simple operation, high working efficiency, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0014] Figure 2 for Figure 1 AA cross-sectional diagram of ;

[0015] Figure 3 It is a top view of the rotating disk;

[0016] Figure 4 It is a schematic diagram of the positional relationship between the present invention and the crystallizer. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] like Figures 1 to 4 A variable diameter gate device is shown, which includes a gate sleeve 1, a gate cup 2, a rotating disk 3, a rotating shaft 4 and a stepping motor 5; the gate sleeve 1 is arranged at the top inlet of the crystallizer, and the lower part of the outer wall of the gate sleeve 1 is a conical structure with a larger upper part and a smaller lower part; a cylindrical cavity 6 is arranged in the middle of the gate sleeve 1, the diameter of the rotating disk 3 is consistent with the inner diameter of the cavity 6, and the rotating disk 3 is horizontally arranged at the bottom of the cavity 6; the gate cup 2 is arranged on one side of the top surface of the gate sleeve 1, and the stepping motor 5 is vertically installed in the middle of the top surface of the gate sleeve 1 through a bracket;

[0019] An ingrate 7 and a runner 8 are provided in the sprue sleeve 1 on one side of the cavity 6, the top liquid inlet of the ingrate 7 is connected to the sprue cup 2 provided on the top surface of the sprue sleeve 1, and the bottom of the ingrate 7 is connected to the cavity 6 above the rotating disk 3 through the runner 8;

[0020] A shaft through hole is provided in the middle of the top surface of the sprue bushing 1, one end of the shaft 4 passes through the shaft through hole and is connected to the middle of the top surface of the rotating disk 3, and the other end of the shaft 4 is connected to the power output end of the stepping motor 5;

[0021] The rotating disk 3 is provided with a plurality of groups of spray holes 10 evenly arranged along concentric circles of different diameters, and the spray holes 10 are arranged in a cross shape; the bottom of the sprue bushing 1 is provided with a plurality of groups of rotating holes 9 evenly arranged along concentric circles of different diameters corresponding to the spray holes 10, and the rotating holes 9 are arranged in a non-cross shape; the rotating disk 3 and the sprue bushing 1 can rotate relative to each other so that only one group of spray holes 10 on the same diameter is connected to the rotating hole 9.

[0022] The gate sleeve 1 is provided with connecting ears 11 on both sides.

[0023] Working process and principle of the present invention:

[0024] By driving the rotating disk 3 to rotate through the stepping motor 5, the rotating holes 9 at different diameter positions can be controlled to align with the spray holes 10 at different diameter positions on the rotating disk 3, so that the molten metal can flow down from channels at different diameters, realizing the variable diameter flow of the molten metal, and pouring large steel ingots (billets) in layers, which gradually solidify and accumulate to form the required shape and size, thereby achieving the purpose of homogenizing the composition and structure and improving the quality of the steel ingot.

[0025] The specific steps are as follows:

[0026] 1) Fill the device with inert gas before pouring;

[0027] 2) Align the spray hole 10 and the circular hole on the rotating hole 9 which are both on the concentric circle of the minimum radius;

[0028] 3) The molten metal is introduced into the pouring cup 2, flows down through the inner runner 7, passes through the cross runner 8, and flows down from the 6 channels located at the concentric circle of the minimum radius of the rotating disk 3 to enter the crystallizer (the remaining channels are not accessible at this time). After the molten metal is initially solidified, the ingot core is pulled out of the crystallizer by a pulling rod, and water spray cooling is performed at the same time until the height of the metal ingot is the same as the target ingot height, and the ingot core is obtained, and the casting is ended;

[0029] 4) Expand the radial dimension of the crystallizer and move the crystallizer so that the bottom of the crystallizer is flush with the bottom of the previously solidified ingot core;

[0030] 5) The rotating shaft 4 is controlled by the stepping motor 5 to rotate the rotating disk 3, and the circular holes on the spray hole 10 and the rotating hole 9, which are both located at the concentric circle of the next-level radius, are aligned, and the holes at other positions are not connected at this time;

[0031] 6) The molten metal is introduced into the pouring cup 2 again, and flows through the inner runner 7 and the cross runner 8, so that the molten metal flows into the crystallizer from the current channel again. After the ingot core coating solidifies, the ingot core with the ingot core coating is pulled down and cooled by spraying water;

[0032] 7) Using the metal ingot obtained by the solidification in the previous step as the ingot core, repeat steps 4) to 6) until the target ingot (bill) size is finally obtained.

Claims

1. A variable diameter gate device, characterized in that: It comprises a sprue sleeve (1), a sprue cup (2), a rotating disk (3), a rotating shaft (4) and a stepping motor (5); the sprue sleeve (1) is arranged at the top inlet of the crystallizer, and the lower part of the outer wall of the sprue sleeve (1) is a conical structure with a larger upper part and a smaller lower part; a cylindrical cavity (6) is arranged in the middle of the sprue sleeve (1), the diameter of the rotating disk (3) is consistent with the inner diameter of the cavity (6), and the rotating disk (3) is horizontally arranged at the bottom of the cavity (6); the sprue cup (2) is arranged on one side of the top surface of the sprue sleeve (1), and the stepping motor (5) is vertically installed in the middle of the top surface of the sprue sleeve (1) through a bracket; An entrapment (7) and a cross runner (8) are provided in the sprue sleeve (1) on one side of the cavity (6); a liquid inlet at the top of the entrapment (7) is connected to a sprue cup (2) provided on the top surface of the sprue sleeve (1); and a bottom of the entrapment (7) is connected to the cavity (6) above the rotating disk (3) through the cross runner (8); A rotating shaft through hole is provided in the middle of the top surface of the sprue sleeve (1), one end of the rotating shaft (4) passes through the rotating shaft through hole and is connected to the middle of the top surface of the rotating disk (3), and the other end of the rotating shaft (4) is connected to the power output end of the stepping motor (5); The rotating disk (3) is provided with a plurality of groups of spray holes (10) evenly arranged along concentric circles of different diameters, and the spray holes (10) are arranged in a cross shape; the bottom of the sprue sleeve (1) is provided with a plurality of groups of rotating holes (9) evenly arranged along concentric circles of different diameters at positions corresponding to the spray holes (10), and the rotating holes (9) are arranged in a non-cross shape; the rotating disk (3) and the sprue sleeve (1) rotate relative to each other so that only one group of spray holes (10) on the same diameter is connected to the rotating holes (9).

2. A variable diameter gate device according to claim 1, characterized in that: The sprue sleeve (1) is provided with connecting lugs (11) on both sides.

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