Sand casting sample pouring system

Abstract

The utility model provides a sand mould casting sample gating system, relates to the technical field of casting, the sand mould casting sample gating system comprises a sprue, a steady flow ring groove, a plurality of cross gates and a plurality of cavities, the sprue is connected to the steady flow ring groove, the plurality of cross gates are uniformly arranged around the steady flow ring groove at intervals, and the cavity is connected to the steady flow ring groove. The multiple cavities are connected to the multiple cross gates in a one-to-one correspondence mode, and the sectional dimensions of the multiple cavities are different. Compared with the prior art, a plurality of cavities are independently arranged, samples with various wall thicknesses can be prepared at the same time, different cavities are mutually independent, the cross gates are uniformly arranged, the temperatures of molten metal reaching the flow gates are similar, and the influence of uncontrollable factors on experimental results is eliminated to the greatest extent. And samples under various cooling speed conditions can be obtained through one-time pouring, so that the efficiency is improved, the cost is saved, and meanwhile, the stability of output data and the accuracy and reliability of an experimental analysis conclusion are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, in particular to a sand casting sample pouring system. Background Art

[0002] During the aluminum alloy casting process, the cooling conditions of the aluminum liquid at different wall thickness positions of the casting are different, which in turn affects the mechanical properties of the material at that position. In order to study the effects of different cooling conditions on the structure and properties of aluminum alloys, and then guide the regulation of product performance in actual production, it is necessary to design experimental molds or devices that can produce different cooling rates during the casting process.

[0003] In the prior art, wedge molds, step molds, gradient solidification devices and directional solidification devices are usually used to achieve the above purpose. The gradient solidification device has a complex structure and low sample preparation efficiency, and is usually not used for sample preparation. Although the wedge mold, step mold, and directional solidification device can produce different cooling rates in the same casting, there is an exchange of matter and energy between different parts of the casting during the solidification process, which will interfere with the subsequent analysis of the relationship between cooling conditions, material organization and mechanical properties. In addition, when performing analysis and detection, it is necessary to take samples from the casting. Since different parts of the casting are connected and affect each other, the microstructure of the sampled part may be uneven, and it has the organizational characteristics of adjacent areas, which makes it impossible to accurately reflect the relationship between the process and organizational performance, which brings difficulties to subsequent analysis. In addition, the thin-walled part of the casting in the step mold is usually located at the far end of the gate during the pouring process. When the aluminum liquid reaches this place, the temperature has dropped relative to the near end of the gate. This is not conducive to the solidification temperature control of different positions of the casting, and it also increases the difficulty of filling the thin-walled area of ​​the casting at the far end of the gate. Utility Model Content

[0004] The purpose of the utility model includes, for example, providing a sand casting sample pouring system, which can simultaneously prepare sand casting processes for samples of various wall thicknesses, and the temperature state of the molten metal is similar when it reaches each inner gate, thereby eliminating the influence of uncontrollable factors on the experimental results to the greatest extent. Samples under various cooling rate conditions can be obtained through one pouring, while improving efficiency and saving costs, ensuring the stability of output data and the accuracy and reliability of experimental analysis conclusions.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In the first aspect, the utility model provides a sand casting sample pouring system, comprising a straight runner, a flow stabilizing groove, a plurality of cross runners and a plurality of cavities, wherein one end of the straight runner is provided with a liquid inlet for allowing molten metal to flow in, and the other end is connected to the flow stabilizing groove, the plurality of cross runners are evenly and spaced apart around the flow stabilizing groove, the plurality of cavities are connected to the plurality of cross runners one by one and extend in a direction away from the liquid inlet, wherein the cross-sectional dimensions of the plurality of cavities are different.

[0007] In an optional embodiment, the plurality of cross runners are distributed in a divergent manner around the flow stabilizing groove, one end of each of the cross runners is connected to the outer side of the flow stabilizing groove, and the other end extends radially along the flow stabilizing groove, and the plurality of cavities are connected one-to-one to the middle parts of the plurality of cross runners.

[0008] In an optional embodiment, a slag collecting nest is further provided at one end of each of the cross runners away from the flow stabilizing annular groove, and the slag collecting nest is bent relative to the cross runner.

[0009] In an optional embodiment, a pressure stabilizing cavity is further formed at one end of the sprue away from the liquid inlet, and the height of the pressure stabilizing cavity relative to the liquid inlet is higher than the height of the flow stabilizing groove relative to the liquid inlet.

[0010] In an optional embodiment, the straight runner is concentrically arranged with the flow stabilizing annular groove, and a plurality of bridging runners are evenly arranged around the straight runner, and the plurality of bridging runners are connected to the inner side of the flow stabilizing annular groove.

[0011] In an optional embodiment, a ceramic filter is further provided in the sprue, and the ceramic filter is used to filter slag inclusions in the molten metal.

[0012] In an optional embodiment, the inner diameter of the sprue gradually decreases in a direction away from the liquid inlet, and the circumference of the pressure-stabilizing cavity is flush with the circumference of the sprue.

[0013] In an optional embodiment, the heights of the plurality of cavities relative to the cross runner are the same, the radial widths of the plurality of cavities along the flow stabilizing groove are the same, and the circumferential widths of the plurality of cavities along the flow stabilizing groove are different.

[0014] In an optional embodiment, the widths of the plurality of cavities along the circumference of the flow stabilizing ring groove increase in an equidistant manner.

[0015] In an optional embodiment, a riser is further provided at one end of each cavity away from the liquid inlet, and the plurality of risers are flush with each other.

[0016] The core assembly forms a pouring system;

[0017] The molten metal is poured into the liquid inlet by low-pressure pouring or gravity pouring.

[0018] The beneficial effects of the embodiments of the present utility model include, for example:

[0019] The sand casting sample pouring system provided by the embodiment of the utility model has a liquid inlet at one end of the straight runner for the molten metal to flow in, and the other end is connected to a flow-stabilizing ring groove, and multiple cross runners are evenly and spaced around the flow-stabilizing ring groove. Multiple cavities are connected to the multiple cross runners one by one and extend in a direction away from the liquid inlet, wherein the cross-sectional dimensions of the multiple cavities are different. Compared with the prior art, the embodiment of the utility model can prepare multiple wall thickness samples at the same time by adding a flow-stabilizing ring groove and realizing the independent setting of multiple cavities through multiple cross runners. The samples with different wall thicknesses are independent of each other and not directly connected, and the cross runners are evenly arranged. The temperature of the molten metal when it reaches the inner gate is similar, which eliminates the influence of uncontrollable factors on the experimental results to the greatest extent. Samples under various cooling speed conditions can be obtained through one pouring, which improves efficiency and saves costs while ensuring the stability of output data and the accuracy and reliability of experimental analysis conclusions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of the sand casting sample pouring system provided by the embodiment of the utility model at a first viewing angle;

[0022] Figure 2 A schematic diagram of the structure of the sand casting sample pouring system provided by the embodiment of the utility model under a second viewing angle;

[0023] Figure 3 A schematic structural diagram of a sand casting sample pouring system provided in an embodiment of the utility model from a third viewing angle.

[0024] Icons: 100-sand casting sample pouring system; 110-sprue; 111-pressure stabilizing cavity; 113-ceramic filter; 115-bridge runner; 130-flow stabilizing groove; 150-cross runner; 151-slag collection nest; 170-mold cavity; 190-riser. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present utility model, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.

[0029] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0030] As disclosed in the background technology, the prior art generally uses 1. a wedge mold; 2. a step mold; 3. a gradient solidification device; and 4. a directional solidification device to conduct solidification experiments. The wedge mold creates a continuously changing thickness in the casting, and the thicker the part of the casting is, the slower the cooling rate is during the pouring process. The step mold creates a step-by-step changing thickness in the casting by designing steps of different heights, and the thicker the part of the casting is, the slower the cooling rate is during the pouring process. The gradient solidification device produces different cooling rates by controlling the rate at which the sample is pulled out of the heating furnace. The directional solidification device uses a cooling system at the bottom of the sample to directionally solidify the sample from bottom to top, and the farther the sample is from the cooling system, the slower the cooling rate is.

[0031] However, the solidification experimental method in the prior art has the following disadvantages:

[0032] 1. The gradient solidification device and the directional solidification device are complex and the efficiency of preparing samples is low.

[0033] 2. Although existing technologies (wedge molds, step molds, and directional solidification devices) can produce different cooling rates in the same casting, there is an exchange of matter and energy between different parts of the casting during the solidification process, which will interfere with the subsequent analysis of the relationship between cooling conditions, material organization, and mechanical properties. In addition, when conducting analysis and testing, it is necessary to take samples from the casting. Since different parts of the casting are interconnected and influence each other, the microstructure of the sampled part may be uneven and have the organizational characteristics of adjacent areas, resulting in the inability to accurately reflect the relationship between the process and organizational performance, which brings difficulties to subsequent analysis.

[0034] 3. In the prior art (step mold), during the pouring process, the thin-walled part of the casting is usually located at the far end of the gate. When the aluminum liquid reaches this part, the temperature has dropped compared to the near end of the gate. This is not conducive to the solidification temperature control of different positions of the casting, and also increases the difficulty of filling the thin-walled area of ​​the casting at the far end of the gate.

[0035] In order to solve the above problems, an embodiment of the utility model provides a sand casting sample pouring system. It should be noted that the features in the embodiments of the utility model can be combined with each other without conflict.

[0036] Please refer to Figures 1 to 3 This embodiment provides a sand casting sample pouring system 100, which can simultaneously prepare sand casting processes for samples of various wall thicknesses, and the temperature state of the molten metal is similar when it reaches each inner gate, thereby eliminating the influence of uncontrollable factors on the experimental results to the greatest extent. Samples under various cooling rate conditions can be obtained through one pouring, while improving efficiency and saving costs, ensuring the stability of output data and the accuracy and reliability of experimental analysis conclusions.

[0037] The sand casting sample pouring system 100 provided in this embodiment includes a straight runner 110, a flow stabilizing groove 130, a plurality of cross runners 150 and a plurality of cavities 170. One end of the straight runner 110 is provided with a liquid inlet for the inflow of molten metal, and the other end is connected to the flow stabilizing groove 130. The plurality of cross runners 150 are evenly and spacedly arranged around the flow stabilizing groove 130. The plurality of cavities 170 are connected to the plurality of cross runners 150 one by one and extend in a direction away from the liquid inlet, wherein the cross-sectional dimensions of the plurality of cavities 170 are different.

[0038] In this embodiment, by adding a flow stabilizing ring groove 130 and realizing the independent setting of multiple cavities 170 through multiple runners 150, multiple wall thickness samples can be prepared at the same time. The samples with different wall thicknesses are independent of each other and not directly connected. The runners 150 are evenly arranged, and the temperature of the molten metal when it reaches the inner gate is similar, which can eliminate the influence of uncontrollable factors on the experimental results to the greatest extent. Through one pouring, samples under various cooling speed conditions can be obtained, which can improve efficiency and save costs while ensuring the stability of output data and the accuracy and reliability of experimental analysis conclusions.

[0039] It is worth noting that in this embodiment, the liquid inlet is located at the bottom of the sprue 110, and a low-pressure pouring process can be used during pouring to ensure the pouring effect. Of course, other pouring processes such as gravity pouring can also be used here to achieve pouring, which is not specifically limited here.

[0040] In this embodiment, a plurality of runners 150 are distributed in a divergent manner around the flow stabilizing annular groove 130, one end of each runner 150 is connected to the outside of the flow stabilizing annular groove 130, and the other end extends along the radial direction of the flow stabilizing annular groove 130, and a plurality of cavities 170 are connected to the middle of the plurality of runners 150 in a one-to-one correspondence. Specifically, the flow stabilizing annular groove 130 is annular, the runners 150 may be 12, the number of cavities 170 is the same as the number of runners 150, and they are arranged in a one-to-one correspondence, the extension direction of the runner 150 coincides with the diameter direction of the flow stabilizing annular groove 130, and the plurality of cavities 170 are evenly distributed, so as to ensure the uniform flow of the molten metal, and further ensure that the temperature of the molten metal flowing to the cavity 170 is similar.

[0041] It should be noted that, in this embodiment, multiple cavities 170 are arranged along the same circumference, and the circumference is concentric with the straight runner 110. In this embodiment, an internal gate is provided at the bottom end of each cavity 170, which is connected to the cross runner 150 through the internal gate, so that the molten metal in the cross runner 150 can flow into the cavity 170 through the internal gate.

[0042] In this embodiment, a slag collecting nest 151 is further provided at one end of each runner 150 away from the flow stabilizing ring groove 130, and the slag collecting nest 151 is bent relative to the runner 150. Specifically, the slag collecting nest 151 is located at the end of the runner 150. During the pouring process, the molten metal will first enter the runner 150, and the slag washed off by the front end of the molten metal will first flow to the slag collecting nest 151 at the end of the runner 150 with the molten metal, thereby ensuring that the clean molten metal will flow into each cavity 170 along the inner gate and slowly fill the mold from bottom to top.

[0043] It should be noted that the slag collecting nest 151 here is relatively upwardly tilted and smoothly transitions with the cross runner 150, which can ensure that the front molten metal will first flow to the slag collecting nest 151 and flush the slag into the slag collecting nest 151. The inner gate of the cavity 170 is located in the middle of the cross runner 150 and is separated from the slag collecting nest 151, which can avoid the slag backflow and thus ensure that the clean molten metal enters the cavity 170 from the inner gate.

[0044] In this embodiment, a pressure stabilizing cavity 111 is further formed at one end of the sprue 110 away from the liquid inlet, and the height of the pressure stabilizing cavity 111 relative to the liquid inlet is higher than the height of the flow stabilizing groove 130 relative to the liquid inlet. Specifically, the pressure stabilizing cavity 111 is located at the center of the flow stabilizing groove 130 and extends upward, which can play a role in stabilizing pressure and ensure that the molten metal smoothly enters the flow stabilizing groove 130 from the sprue 110.

[0045] Furthermore, the sprue 110 is concentrically arranged with the flow stabilizing annular groove 130, and a plurality of bridge runners 115 are evenly arranged around the sprue 110, and the plurality of bridge runners 115 are connected to the inner side of the flow stabilizing annular groove 130. Specifically, there may be 6 bridge runners 115, and the 6 bridge runners 115 are evenly distributed around the sprue 110, wherein the bridge runners 115 are located at the connection between the sprue 110 and the pressure stabilizing cavity 111, and extend radially in the horizontal direction, so that the molten metal can flow down to the flow stabilizing annular groove 130, and after being buffered and stabilized by the flow stabilizing annular groove 130, it evenly flows to the plurality of cross runners 150.

[0046] In this embodiment, a ceramic filter 113 is further provided in the sprue 110, and the ceramic filter 113 is used to filter slag inclusions in the molten metal. Specifically, the ceramic filter 113 can be embedded in one end of the sprue 110 close to the bridge runner 115, and the slag inclusions in the molten metal can be filtered through the ceramic filter 113, so that the relatively clean molten metal can flow smoothly into the steady flow annular groove 130 and the pressure stabilizing cavity 111.

[0047] In this embodiment, the inner diameter of the sprue 110 gradually decreases in the direction away from the liquid inlet, and the circumference of the pressure stabilizing cavity 111 is flush with the circumference of the sprue 110. Specifically, the inner diameter of the sprue 110 gradually decreases, so that the molten metal can be quickly filled after entering the sprue 110 and flow upward, and at the same time, the oblique side wall can also block impurities and slag in the front end molten metal as much as possible, so as to prevent impurities and slag from entering the ceramic filter 113 in large quantities and causing it to be blocked.

[0048] In this embodiment, the heights of the plurality of cavities 170 relative to the runner 150 are the same, and the widths of the plurality of cavities 170 along the radial direction of the flow-stabilizing annular groove 130 are the same, and the widths of the plurality of cavities 170 along the circumferential direction of the flow-stabilizing annular groove 130 are different. Specifically, the height and radial width of the cavity 170 are the same, so that the flow rate of the metal liquid filled in the plurality of cavities 170 is the same, while the circumferential widths are different, so that sample castings with different wall thicknesses can be realized. Moreover, because a one-piece multi-molding design is adopted and cavities 170 of different sizes are designed according to samples with different wall thicknesses, multiple samples under various cooling rate conditions can be obtained through one casting, thereby improving sample preparation efficiency.

[0049] Specifically, the widths of the plurality of cavities 170 along the circumferential direction of the flow-stabilizing annular groove 130 are equidistantly increased. For example, there may be 12 cavities 170, with 4 cavities forming a group, and the width (i.e., wall thickness) of each group of cavities 170 may be equidistantly increased, such as 3 mm, 5 mm, 7 mm, and 9 mm, in a cycle, so that cavities 170 with equidistantly increasing wall thicknesses can be realized.

[0050] Furthermore, a riser 190 is provided at one end of each cavity 170 away from the liquid inlet, and the plurality of risers 190 are flush with each other. Specifically, the size of the riser 190 is larger than the size of the corresponding cavity 170 .

[0051] The present utility model also provides a sand casting sample forming method, which is applicable to the aforementioned sand casting sample pouring system 100, and the method comprises the following steps:

[0052] S1: Design cavities 170 of different sizes.

[0053] S2: Core assembly forms a pouring system.

[0054] S3: Pour the molten metal into the liquid inlet using low-pressure pouring or gravity pouring technology.

[0055] Specifically, first, a sample cavity 170 with a variety of wall thicknesses can be designed. The design process can be simulation data. Then, the mold is designed according to the simulation data, and then the core is assembled to form a casting system, and finally the casting process is performed. When the molten metal is filled, the molten metal flows in from the liquid inlet of the sprue 110. After passing through the ceramic filter 113, the slag inclusions in the molten metal are filtered out. The molten metal continues to flow smoothly into the steady flow annular groove 130 and the pressure stabilizing cavity 111 on the upper part of the sprue 110. After the steady flow annular groove 130 is filled, the molten metal flows into the runner 150. At this time, the slag inclusions washed off by the front end of the molten metal will flow to the slag collection nest 151 at the edge of the runner 150 with the molten metal first. The clean molten metal will flow into each sample cavity 170 along the inner gate, and slowly fill the mold from bottom to top.

[0056] It should be noted that, because this embodiment adopts a one-piece multi-type design and designs cavities 170 of different sizes according to samples with different wall thicknesses, multiple samples under various cooling rate conditions can be obtained through one pouring, thereby improving the efficiency of sample preparation. In addition, because different sample cavities 170 are not directly connected to each other, the solidification processes of each sample are independent of each other and do not interfere with each other, which is conducive to controlling experimental variables and obtaining reliable experimental data. Moreover, because the sample cavities 170 are arranged in equidistant circles around the sprue 110, the temperature and other conditions of the molten metal reaching the gate of each cavity 170 are similar, which is conducive to controlling experimental variables and obtaining stable experimental data.

[0057] As for the test results, the simulation software AnyCasting was used to simulate the filling and solidification, which showed that: 1. The solidification time of samples of different thicknesses was different. The thicker the sample, the slower the cooling rate and the longer the solidification time. 2. During the filling process, the temperature of the molten aluminum when it reached the gate of each cavity 170 was similar.

[0058] In summary, the sand casting sample pouring system 100 and the sand casting sample molding method provided in the present embodiment are provided with a liquid inlet at one end of the sprue 110 for the molten metal to flow in, and the other end is connected to the steady flow annular groove 130, and a plurality of runners 150 are evenly and spacedly arranged around the steady flow annular groove 130, and a plurality of cavities 170 are connected to the plurality of runners 150 one by one and extend in a direction away from the liquid inlet, wherein the cross-sectional dimensions of the plurality of cavities 170 are different. Compared with the prior art, the embodiment of the present utility model can prepare a variety of wall thickness samples at the same time by adding a steady flow annular groove 130 and realizing the independent arrangement of a plurality of cavities 170 through a plurality of runners 150, and the samples with different wall thicknesses are independent of each other and not directly connected, and the runners 150 are evenly arranged, and the temperature of the molten metal when it reaches the inner gate is similar, thereby eliminating the influence of uncontrollable factors on the experimental results to the greatest extent. Through a single pouring, samples under various cooling rate conditions can be obtained, which not only improves efficiency and saves costs, but also ensures the stability of output data and the accuracy and reliability of experimental analysis conclusions.

[0059] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A sand casting sample pouring system, characterized in that: It includes a straight runner, a flow stabilizing groove, multiple cross runners and multiple cavities. One end of the straight runner is provided with a liquid inlet for the flow of molten metal, and the other end is connected to the flow stabilizing groove. The multiple cross runners are evenly and spaced around the flow stabilizing groove. The multiple cavities are connected to the multiple cross runners one by one and extend in a direction away from the liquid inlet, wherein the cross-sectional dimensions of the multiple cavities are different.

2. The sand casting sample pouring system according to claim 1, characterized in that: The plurality of cross runners are distributed in a divergent manner around the flow stabilizing groove, one end of each cross runner is connected to the outer side of the flow stabilizing groove, and the other end extends radially along the flow stabilizing groove, and the plurality of cavities are connected one by one to the middle of the plurality of cross runners.

3. The sand casting sample pouring system according to claim 2, characterized in that: A slag collecting nest is further provided at one end of each of the cross runners away from the flow stabilizing annular groove, and the slag collecting nest is bent relative to the cross runner.

4. The sand casting sample pouring system according to claim 1, characterized in that: A pressure stabilizing cavity is further formed at one end of the sprue away from the liquid inlet, and a height of the pressure stabilizing cavity relative to the liquid inlet is higher than a height of the flow stabilizing ring groove relative to the liquid inlet.

5. The sand casting sample pouring system according to claim 4, characterized in that: The straight runner is concentrically arranged with the flow stabilizing annular groove, and a plurality of bridging runners are evenly arranged around the straight runner, and the plurality of bridging runners are connected to the inner side of the flow stabilizing annular groove.

6. The sand casting sample pouring system according to claim 4, characterized in that: A ceramic filter screen is also provided in the sprue, and the ceramic filter screen is used to filter slag inclusions in the molten metal.

7. The sand casting sample pouring system according to claim 4, characterized in that: The inner diameter of the sprue gradually decreases in a direction away from the liquid inlet, and the circumference of the pressure-stabilizing cavity is flush with the circumference of the sprue.

8. The sand casting sample pouring system according to claim 1, characterized in that: The heights of the plurality of cavities relative to the runner are the same, the radial widths of the plurality of cavities along the flow stabilizing ring groove are the same, and the circumferential widths of the plurality of cavities along the flow stabilizing ring groove are different.

9. The sand casting sample pouring system according to claim 8, characterized in that: The widths of the plurality of cavities along the circumference of the flow-stabilizing annular groove increase in an equidistant manner.

10. The sand casting sample pouring system according to claim 1 or 8, characterized in that: A riser is also provided at one end of each cavity away from the liquid inlet, and a plurality of risers are flush with each other.

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