Casting mechanism for medical magnesium alloy

Abstract

The utility model belongs to the technical field of production devices of biomedical metal materials, and relates to a casting mechanism of medical magnesium alloy. The casting mechanism comprises a cover body, a casting mold pipe body, a filter clamping seat, a connecting pipe body and a bottom plate which are sequentially connected from top to bottom, a filter is arranged in the filter clamping seat, and a molten metal surface grade sensor, an inert gas leading-in valve and a pressure reduction pump connecting part are arranged on the cover body. Through the arrangement of the filter in the casting mechanism, inclusion and gas mixing and composition segregation can be avoided, and therefore casting materials of medical magnesium alloy are produced.

Description

Technical Field

[0001] The utility model belongs to the technical field of production devices for biomedical metal materials and relates to a casting mechanism for medical magnesium alloys. Background Art

[0002] Currently, the main medical metal materials widely used in clinical practice include stainless steel, titanium alloys, and cobalt-chromium alloys. These materials offer excellent corrosion resistance. However, this property also means that metal materials remain permanently in the human body. This poses numerous risks, such as late postoperative inflammatory reactions, for secondary surgeries intended to remove the medical device after healing, or for medical devices that are difficult to remove.

[0003] To address the risks of existing implantable medical devices, materials that can be degraded and absorbed in the human body have received widespread attention. Among these materials, experts have great expectations for magnesium and magnesium alloys (hereinafter referred to as magnesium alloys) for the following reasons: (1) Magnesium is a major element necessary for the human body, is not prone to poisoning, and is relatively safe in the human body; (2) Compared with non-degradable medical metals, the Young's modulus of magnesium and magnesium alloys is closest to that of human bones, which can effectively reduce stress shielding; (3) Compared with polylactic acid materials, magnesium alloys have better mechanical properties. Compared with traditional magnesium alloy applications, the size of component materials required for implantable medical devices is extremely small. For this reason, the shape of the casting material is also preferably small in diameter. Due to the product yield, a longer length is preferred. However, for extremely long casting molds, inclusions and gases are easily mixed in and solidified during casting. In addition, to avoid the above problems, if the time of maintaining the molten metal state after casting is extended, composition segregation will occur. Semi-continuous casting equipment reduces the risk of inclusions and gas incorporation, avoids compositional segregation, and allows the production of longer castings. However, achieving this requires a large casting unit, making it difficult to install within existing melting or holding furnaces. Furthermore, the range of suitable casting conditions for semi-continuous casting narrows as the diameter decreases. Improper production conditions can lead to molten metal leakage, creating production difficulties and posing risks such as water vaporization explosions and fires. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a casting mechanism for medical magnesium alloys. By using the casting mechanism of the present invention, the mixing of inclusions and gases and the occurrence of component segregation can be avoided, thereby efficiently and safely preparing medical magnesium alloy materials to solve the problems in the prior art.

[0005] To achieve the above-mentioned objectives and other related objectives, the present invention provides, on the one hand, a casting mechanism for medical magnesium alloys, comprising a cover body, a casting mold tube body, a filter clamp seat, a connecting tube body and a base plate connected in sequence from top to bottom, wherein a filter is provided in the filter clamp seat, and the cover body is respectively provided with a molten metal surface level sensor, an inert gas inlet valve and a pressure reducing pump connection part.

[0006] In some embodiments of the present invention, the inner diameter of the casting mold tube body is 30±5 mm; the wall thickness of the casting mold tube body is 2±1 mm; and the length of the casting mold tube body is 500 to 1500 mm.

[0007] In some embodiments of the present invention, an upper flange is provided on the casting mold tube body, and the cover body and the casting mold tube body are connected via the upper flange.

[0008] In some embodiments of the present invention, a lower flange is provided on the casting mold tube body, and the filter clamp seat and the casting mold tube body are connected via the lower flange.

[0009] In some embodiments of the present invention, the filter holder includes an opening portion, the filter is disposed in the opening portion, and the surface area of the bottom plate is larger than the surface area of the opening portion.

[0010] In some embodiments of the present invention, the filter is made of a material that does not react with the molten magnesium alloy metal.

[0011] In some embodiments of the present invention, the pore size of the filter gradually decreases from an end close to the connecting tube body to an end close to the casting tube body.

[0012] In some embodiments of the present invention, the distance between the filter holder and the bottom plate is 15±10 mm.

[0013] In some embodiments of the present invention, the molten metal surface level sensor, the inert gas introduction valve and the pressure reducing pump connection portion are respectively connected to the mold tube body.

[0014] The present invention also provides a method for preparing a casting material using the casting mechanism of the medical magnesium alloy described above, comprising the following steps:

[0015] 1) Introducing inert gas into the mold tube through the inert gas inlet valve;

[0016] 2) preheating the mold tube and sinking the casting structure into the molten metal;

[0017] 3) Turn on the pressure reducing pump connected to the pressure reducing pump connection part to draw the molten metal into the mold tube;

[0018] 4) After confirming that the molten metal has risen to a certain height from a portion of the filter using a molten metal surface level sensor, turn off the pressure reducing pump;

[0019] 5) removing the casting mechanism from the molten metal and cooling the mold tube to solidify the molten metal in the mold tube;

[0020] 6) The solidified molten metal is taken out to obtain a casting material.

[0021] The beneficial effects of adopting the technical solution of the utility model are:

[0022] By utilizing the filter arrangement in the casting mechanism of the present invention, inclusions, gas mixing, and component segregation can be avoided, thereby producing medical magnesium alloy casting materials, preferably small-caliber and long-sized casting materials. In addition, the casting mechanism of the present invention can be subsequently installed on an existing smelting casting mechanism. In addition, because the molten metal is covered by the steel pipe, the molten metal liquid will not leak under inappropriate casting conditions, as in a semi-continuous casting mechanism, thereby causing water vaporization explosions, fires, and other dangers. Compared with traditional magnesium alloy casting casting mechanisms, the operation of this casting mechanism does not require a large space. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shown is a schematic structural diagram of the casting mechanism of the medical magnesium alloy of the present invention.

[0024] Figure 2 Shown is a schematic structural diagram of the casting mechanism used in Comparative Examples 1 and 2 of the present invention.

[0025] Figure 3 Shown is a schematic structural diagram of the casting mechanism used in Comparative Example 3 of the present invention.

[0026] Component numbers in the figure

[0027] 1 Cover

[0028] 2 cast tube body

[0029] 21 Upper flange

[0030] 22 Lower flange

[0031] 3 filter holder

[0032] 31 opening

[0033] 4 Connecting pipe

[0034] 5 bottom plate

[0035] 6 Filters

[0036] 7 Molten Metal Surface Level Sensor

[0037] 8 Inert gas inlet valve

[0038] 9 Pressure reducing pump connection DETAILED DESCRIPTION

[0039] In the description of the present invention, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with the art, and are not intended to limit the conditions for the implementation of the present invention. Therefore, they have no technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size should still fall within the scope of the technical content disclosed in the present invention without affecting the effects and objectives that can be achieved by the present invention. At the same time, the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0040] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0041] In addition, in the description of the present invention, unless otherwise specified, “a plurality of” means two or more.

[0042] like Figure 1 An embodiment of the utility model relates to a casting mechanism for medical magnesium alloy, which includes a cover body 1, a mold tube body 2, a filter clamp seat 3, a connecting tube body 4 and a bottom plate 5 connected in sequence from top to bottom. A filter 6 is provided in the filter clamp seat 3, and a molten metal surface level sensor 7, an inert gas inlet valve 8 and a pressure reducing pump connection part 9 are respectively provided on the cover body 1.

[0043] In the casting mechanism for medical magnesium alloys provided in an embodiment of the present invention, a cover 1 is used to cover the mold tube 2. The cover 1 can be used to adjust the length of the casting material. The cover 1 is connected to a pressure-reducing pump via a pressure-reducing pump connection 9. The pressure-reducing pump reduces pressure, gradually drawing the molten metal into the mold tube 2. An inserted molten metal surface level sensor 7 (e.g., a laser rangefinder or a contact rangefinder) stops pressure reduction when the molten metal surface reaches any desired height.

[0044] In the casting mechanism of the medical magnesium alloy provided in the embodiment of the present invention, the mold tube body 2 is used for the casting mold. In some embodiments, the mold tube body 2 is a long steel tube, and the long steel tube is an integrated tube. The inner diameter of the mold tube body 2 is the outer diameter of the casting material produced, and its inner diameter can be arbitrarily changed according to the outer diameter of the casting material to be produced. In some embodiments, the inner diameter of the mold tube body 2 is 30±5mm; the wall thickness of the mold tube body 2 is 2±1mm based on the balance between thermal deformation and heat conduction; the length of the mold tube body 2 is 500~1500mm.

[0045] In the casting mechanism of the medical magnesium alloy provided by the embodiment of the present invention, Figure 1 The mold tube body 2 is provided with an upper flange 21 , and the cover body 1 and the mold tube body 2 are connected via the upper flange 21 .

[0046] In the casting mechanism of the medical magnesium alloy provided by the embodiment of the present invention, Figure 1 The mold tube body 2 is provided with a lower flange 22 , and the filter clamp seat 3 and the mold tube body 2 are connected via the lower flange 22 .

[0047] In the casting mechanism of the medical magnesium alloy provided by the embodiment of the present invention, Figure 1 The filter holder 3 includes an opening 31, and the filter 6 is disposed in the opening 31. In some embodiments, the filter holder 3 is composed of two flanges, and there is a gap between the two flanges for mounting the filter 6, namely the opening 31.

[0048] In the medical magnesium alloy casting mechanism provided by the embodiment of the present invention, the filter 6 has the function of preventing the backflow of molten metal. Specifications of the filter 6: The material that does not react with the magnesium alloy molten metal should be selected, that is, the material of the filter 6 is a material that does not react with the magnesium alloy molten metal. Items related to filtering performance and life, such as pore size and thickness, will change according to the alloy composition, the cleanliness of the raw materials, the smelting conditions, etc., and are also related to the inclusion content in the molten metal and the viscosity of the molten metal. Therefore, appropriate selection should be made based on specific conditions. Optionally, the pore size of the filter 6 gradually decreases from the end close to the connecting tube body 4 to the end close to the casting mold tube body 2. In some embodiments, the filter 6 can be a filter made of magnesium oxide, for example, with a pore size of 100 to 1000 μm and a thickness of 30 to 50 mm.

[0049] In the casting mechanism of the medical magnesium alloy provided by the embodiment of the present invention, Figure 1 The bottom of the filter holder 3 is connected to the bottom plate 5 via the connecting tube body 4. The surface area of the bottom plate 5 should be larger than the surface area of the opening 31 of the filter holder 3. In some embodiments, the bottom plate 5 is arranged directly below the opening 31 of the filter 6. The bottom plate 5 can be used to avoid the suction of dirty molten metal with a lot of inclusions near the bottom of the furnace. In addition, it can also avoid the oxide film on the surface of the molten metal adhering to the filter 6 when the casting mechanism sinks into the molten metal, thereby preventing the filter 6 from being blocked. In some embodiments, the connecting tube body 4 can be, for example, a steel rod.

[0050] In the casting mechanism of the medical magnesium alloy provided by the embodiment of the present utility model, the distance between the filter holder 3 and the bottom plate 5 is 15±10 mm, that is, the height of the connecting tube 4.

[0051] In the casting mechanism of medical magnesium alloy provided by the embodiment of the present utility model, a molten metal surface level sensor 7, an inert gas inlet valve 8 and a pressure reducing pump connection part 9 are respectively provided on the cover body 1, and the molten metal surface level sensor 7, the inert gas inlet valve 8 and the pressure reducing pump connection part 9 are respectively connected to the casting mold tube body 2.

[0052] In the casting mechanism of the medical magnesium alloy provided by the embodiment of the present invention, the parts in contact with the molten metal should be made of stainless steel or aluminum-plated steel.

[0053] In the casting mechanism of the medical magnesium alloy provided by the embodiment of the present invention, each connection among the cover body 1, the mold tube body 2, the filter clamp seat 3, the connecting tube body 4 and the bottom plate 5 is an airtight structure through metal contact.

[0054] The working process of the casting mechanism of the medical magnesium alloy provided by the present invention is as follows:

[0055] Casting Operation 1: Before immersing the casting structure in the molten metal, inert gas is introduced to fill the interior of the mold tube 2. This is necessary because any residual atmospheric air (oxygen, nitrogen, etc.) inside the mold tube 2 will react with the molten magnesium metal and cause contamination.

[0056] Casting Step 2: While continuously introducing a certain amount of inert gas, slowly lower the casting structure into the molten metal. It is preferable to preheat the casting structure using an electric furnace, etc. This operation can reduce the risk of an undesirable drop in molten metal temperature, water vaporization explosion, etc.

[0057] Casting operation 3: After the casting mechanism is sunk to an arbitrary height, the vacuum pump connected to the vacuum pump connection part 9 is operated to suck the molten metal into the mold tube body 2.

[0058] Casting Operation 4: After confirming that the molten metal has risen to the specified height using the molten metal surface level sensor 7, the pressure reducing pump is turned off. At this point, if the pore size of the filter 6 is appropriate, the molten metal will not flow back and the oil level will be maintained.

[0059] Casting operation 5: The casting structure is fished out from the molten metal and air-cooled. Alternatively, the mold tube body 2 is directly or indirectly water-cooled to solidify the molten metal in the steel tube.

[0060] Type of release agent: A release agent may be used as needed. Choose one that will not dislodge due to thermal shock and mix into the molten metal. More preferably, a water-soluble release agent is applied to the interior of the mold tube 2 using a brush. Residual moisture inside the mold tube 2 poses a high risk of vaporization explosion upon contact with the molten metal. Therefore, sufficient preheating and drying is essential to ensure complete evaporation of the moisture.

[0061] The present invention also provides a method for preparing a casting material for a casting mechanism of a medical magnesium alloy, which is characterized by comprising the following steps:

[0062] 1) Introducing inert gas into the mold tube 2 through the inert gas inlet valve 8;

[0063] 2) preheating the mold tube 2 and sinking the casting mechanism into the molten metal;

[0064] 3) Turn on the pressure reducing pump connected to the pressure reducing pump connection part 9 to suck the molten metal into the mold tube body 2;

[0065] 4) After confirming that the molten metal has risen to a certain height from a portion of the filter 6 using the molten metal surface level sensor 7, the pressure reducing pump is turned off;

[0066] 5) removing the casting mechanism from the molten metal and cooling the mold tube 2 to solidify the molten metal in the mold tube 2;

[0067] 6) The solidified molten metal is taken out to obtain a casting material.

[0068] Example 1

[0069] Use as Figure 1 The casting mechanism of the structure shown is used to prepare small-diameter long tube casting materials.

[0070] Regarding the type of magnesium alloy, Mg-2wt%Zn alloy was prepared and produced.

[0071] The molded pipe body 2 is a long steel pipe with flanges at both ends, with an inner diameter of 30 mm, a wall thickness of 1 mm, and a length of 1500 mm.

[0072] The lower flange 22 is connected to the filter holder 3. The filter holder 3 is composed of two flanges, and there is a gap or an opening 31 between the two flanges in which the filter 6 can be installed.

[0073] Specifications of filter 6: A filter 6 made of magnesium oxide is used, and the pore size of the filter 6 gradually decreases from bottom to top.

[0074] The bottom of the filter holder 3 is connected to the bottom plate 5 via a steel rod. The area of the bottom plate 5 is larger than the opening 31 of the filter holder 3. The distance between the filter holder 3 and the bottom plate 5 is 10 mm.

[0075] The upper flange 21 is connected to the cover 1. The cover 1 is provided with a molten metal surface level sensor 7, an inert gas introduction valve 8 and a pressure reducing pump connection portion 9.

[0076] Material: Aluminum-plated steel.

[0077] Casting operation 1: Before immersing the casting structure into the molten metal, an inert gas is introduced so that the inert gas fills the interior of the casting structure.

[0078] Casting Step 2: The lower 500mm of the casting structure is preheated in an electric furnace maintained at 700°C for 30 minutes. The structure is then removed from the furnace and slowly lowered into molten metal while a constant flow of inert gas is introduced. The molten metal temperature is 680°C.

[0079] Casting operation 3: After the casting mechanism is sunk to a position 10% of the molten metal height from the bottom, the decompression pump is operated to suck the molten metal into the mold tube body 2.

[0080] Casting Operation 4: After confirming that the molten metal has risen from a portion of the filter 6 to a height of 1,100 mm using the molten metal surface level sensor 7, the decompression pump is turned off.

[0081] Casting operation 5: The casting structure is fished out from the molten metal, and then the mold tube body 2 is subjected to indirect water cooling treatment to solidify the molten metal in the mold tube body 2.

[0082] Obtaining the casting material: After confirming that the entire casting mechanism has been sufficiently cooled, the casting material is squeezed out of the mold tube body 2 using a clamp to prepare the casting material.

[0083] Inclusion assessment: Ultrasonic testing was used to assess inclusions. The results are shown in Table 1.

[0084] Evaluation of component segregation: Zn content was measured at the upper and lower ends of the cast material using an ICP emission spectrometer. The results are shown in Table 2.

[0085] Comparative Example 1

[0086] Use as Figure 2 Casting mechanism of the construction shown.

[0087] As for the type of magnesium alloy, Mg-2wt%Zn alloy was prepared and produced.

[0088] The structure of the casting mechanism is as follows: 1 is a stainless steel mold tube body 2 with an inner diameter of 30 mm and a length of 500 mm. The upper half of the mold tube body 2 is provided with a filter 6. The mold tube body 2 is placed in an electric furnace as a whole for preheating.

[0089] Casting Operation 1: Preparation of Molten Metal The smelting furnace used was the same one used to prepare the molten metal by sinking the casting mechanism in Example 1. The molten metal was poured into the casting mechanism. The temperature of the molten metal was 680°C.

[0090] Casting Operation 2: In order to remove the precipitated inclusions and mixed gases generated by the molten metal injection, a 10-minute precipitation and static treatment is performed. The molten metal temperature is maintained at 670±10℃.

[0091] Casting operation 3: After the settling and settling process is completed, the entire mold tube body 2 is taken out of the electric furnace and subjected to direct water cooling treatment to solidify the molten metal inside.

[0092] Obtaining the casting material: After confirming that the entire casting mechanism has been sufficiently cooled, remove the filter 6, slowly return the mold tube 2 to its original position and remove the casting material.

[0093] Inclusion assessment: Ultrasonic testing was used to assess inclusions. The results are shown in Table 1.

[0094] Evaluation of component segregation: Zn content was measured at the upper and lower ends of the cast material using an ICP emission spectrometer. The results are shown in Table 2.

[0095] Comparative Example 2

[0096] Use as Figure 2 Casting mechanism of the construction shown.

[0097] Regarding the type of magnesium alloy, Mg-2wt%Zn alloy was produced.

[0098] The structure of the casting mechanism is as follows: 1 is a stainless steel mold tube body 2 with an inner diameter of 30 mm and a length of 1000 mm. The upper half of the mold tube body 2 is provided with a filter 6. The mold tube body 2 is placed in an electric furnace as a whole for preheating.

[0099] Casting Operation 1: Preparation of Molten Metal The smelting furnace used was the same one used to produce the molten metal in Example 1. The molten metal was poured into this casting mechanism. The temperature of the molten metal was 680°C.

[0100] Casting Operation 2: In order to remove the precipitated inclusions and mixed gases generated by the molten metal injection, a 10-minute precipitation and static treatment is performed. The molten metal temperature is maintained at 670±10℃.

[0101] Casting operation 3: After the settling and settling process is completed, the entire mold tube body 2 is taken out of the electric furnace and subjected to direct water cooling treatment to solidify the molten metal inside.

[0102] Obtaining the casting material: After confirming that the entire casting mechanism has been sufficiently cooled, the filter 6 is removed and the mold tube 2 is slowly returned to its original position. However, the casting material inside cannot be pulled out and the casting material cannot be prepared.

[0103] Comparative Example 3

[0104] Use as Figure 3 Casting mechanism of the construction shown.

[0105] Regarding the type of magnesium alloy, Mg-2wt%Zn alloy was produced.

[0106] The casting mechanism consists of a stainless steel mold tube 1 with an inner diameter of 30 mm and a length of 1000 mm. The mold tube 2 is a two-part, cuttable structure. A filter 6 is located in the upper half of the mold tube 2. The entire mold tube 2 is placed in an electric furnace for preheating.

[0107] Casting Operation 1: Preparation of Molten Metal The smelting furnace used was the same one used to produce the molten metal in Example 1. The molten metal was poured into this casting mechanism. The temperature of the molten metal was 680°C.

[0108] Casting Operation 2: In order to remove the precipitated inclusions and mixed gases generated by the molten metal injection, a 30-minute precipitation and static treatment is performed. The molten metal temperature is maintained at 670±10℃.

[0109] Casting operation 3: After the settling and settling process is completed, the entire mold tube body 2 is taken out of the electric furnace and subjected to direct water cooling treatment to solidify the molten metal inside.

[0110] Obtaining the casting material: After confirming that the entire casting mechanism has been sufficiently cooled, remove the filter 6, disassemble the mold tube 2, and then take out the casting material.

[0111] Inclusion assessment: Ultrasonic testing was used to assess inclusions. The results are shown in Table 1.

[0112] Evaluation of component segregation: Zn content was measured at the upper and lower ends of the cast material using an ICP emission spectrometer. The results are shown in Table 2.

[0113] Table 1

[0114] Number of detected peaks Example 1 ND Comparative Example 1 19 Comparative Example 2 Failed to successfully prepare the casting material. Comparative Example 3 7

[0115] Table 2

[0116]

[0117] In summary, by utilizing the filter 6 in the casting mechanism of the present invention, inclusions, gas mixing, and composition segregation can be avoided, thereby producing medical magnesium alloy casting materials, preferably small-diameter and long-sized casting materials. Furthermore, the casting mechanism of the present invention can be subsequently installed on an existing smelting and casting mechanism. Furthermore, because the molten metal is covered by the steel pipe, leakage of the molten metal under inappropriate casting conditions, as in a semi-continuous casting mechanism, will not occur, thereby causing dangers such as water vaporization explosions and fires. Compared to traditional magnesium alloy casting mechanisms, this casting mechanism does not require a large space for operation.

[0118] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0119] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A casting mechanism for medical magnesium alloy, characterized in that: The invention comprises a cover body (1), a mold tube body (2), a filter clamp seat (3), a connecting tube body (4) and a bottom plate (5) which are sequentially connected from top to bottom. The filter clamp seat (3) is provided with a filter (6). The cover body (1) is respectively provided with a molten metal surface level sensor (7), an inert gas introduction valve (8) and a pressure reducing pump connection part (9).

2. The casting mechanism of medical magnesium alloy according to claim 1, characterized in that: The inner diameter of the casting mold tube body (2) is 30±5 mm; the wall thickness of the casting mold tube body (2) is 2±1 mm.

3. The casting mechanism of medical magnesium alloy according to claim 1, characterized in that: The length of the casting mold tube body (2) is 500-1500 mm.

4. The casting mechanism of medical magnesium alloy according to claim 1, characterized in that: An upper flange (21) is provided on the casting mold tube body (2), and the cover body (1) and the casting mold tube body (2) are connected via the upper flange (21).

5. The casting mechanism of medical magnesium alloy according to claim 1, characterized in that: The mold tube body (2) is provided with a lower flange (22), and the filter clamp seat (3) and the mold tube body (2) are connected via the lower flange (22).

6. The casting mechanism of medical magnesium alloy according to claim 1, characterized in that: The filter holder (3) comprises an opening (31), and the filter (6) is arranged in the opening (31); the surface area of the bottom plate (5) is larger than the surface area of the opening (31).

7. The casting mechanism of medical magnesium alloy according to claim 1, characterized in that: The filter (6) is made of a material that does not react with the magnesium alloy molten metal.

8. The casting mechanism of medical magnesium alloy according to claim 1, characterized in that: The pore size of the filter (6) gradually decreases from the end close to the connecting tube body (4) to the end close to the casting mold tube body (2).

9. The casting mechanism of medical magnesium alloy according to claim 1, characterized in that: The distance between the filter holder (3) and the bottom plate (5) is 15±10 mm.

10. The casting mechanism of medical magnesium alloy according to claim 1, characterized in that: The molten metal surface level sensor (7), the inert gas introduction valve (8) and the pressure reducing pump connection part (9) are respectively communicated with the mold tube body (2).

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