A split mold for a nuclear reactor nozzle

Abstract

The application belongs to the technical field of molds, and provides a split mold for a pipe seat of a nuclear reactor, which comprises an upper mold base, an upper mold, a lower mold, a lower mold base and a ejector assembly; the upper mold is installed in the upper mold base and is used for casting the upper surface of a wax mold; the lower mold is installed in the lower mold base and is used for casting the lower surface of the wax mold; the upper mold and the lower mold are combined to form a mold cavity; and the ejector assembly is used for ejecting the casted wax mold; the mold fully considers the structure of the wax mold, and the mold cavity structure meeting the structure of the wax mold is formed through the combination of the upper mold, the lower mold and the ejector assembly; and the first ejector pin and the second ejector pin are adopted in the ejector assembly, so that the lower surface and the side surface of the wax mold can be uniformly supported when being ejected, and the situation of being pulled out of the mold is avoided.

Description

Technical Field

[0001] This invention belongs to the field of mold technology, and specifically relates to a split mold for a nuclear reactor upper tube seat. Background Technology

[0002] Lost-wax casting is a common method for casting the upper tube seat of nuclear fuel assemblies. This method can effectively solve the problem of deformation of connecting plates and drainage holes that occurs during welding when machining methods are used.

[0003] In wax pattern casting, a split mold is generally used. The upper and lower molds are joined to form a cavity, and molten wax is poured into the cavity through a sprue. After cooling for a period of time, the wax pattern is ejected by ejector pins. However, wax patterns vary in structure, so both the ejector pins and the mold cavity need to be designed according to the wax pattern. Currently, in the casting process of nuclear fuel assemblies, some wax pattern cavities are complex, requiring the casting of numerous forming holes on the surface, and some areas have large wall thicknesses. Therefore, the wax pattern is prone to shrinkage and deformation during the molding process. Moreover, the different structures of wax patterns result in different mold cavities. Therefore, for different cavities, it is necessary to ensure that the ejector pins can eject the wax pattern evenly to avoid mold pulling. Summary of the Invention

[0004] To address at least one of the problems in the background art, a split mold for the upper tube seat of a nuclear reactor is provided.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A split mold for a nuclear reactor upper tube seat, used for casting wax molds, includes an upper mold base, an upper mold, a lower mold, a lower mold base, and an ejector pin assembly;

[0007] The upper mold is installed in the upper mold base and is used to cast the upper surface of the wax mold;

[0008] The lower mold is installed in the lower mold base and is used to cast the lower surface of the wax model;

[0009] The upper and lower molds are joined to form a cavity;

[0010] The ejector pin assembly is used to eject the cast wax model.

[0011] Preferably, the wax mold has a front surface as the upper molding surface and a back surface as the lower molding surface;

[0012] The upper surface is concave inward, and the lower surface is planar;

[0013] The upper surface is rectangular, with a diagonal groove at one diagonal and several evenly distributed external forming holes near the edge. Several evenly distributed internal forming holes are also provided inside the external forming holes.

[0014] The upper surface is also provided with several evenly distributed arc grooves;

[0015] The lower surface has several ejector grooves, and the ejector grooves correspond one-to-one with the arc grooves.

[0016] Preferably, both the outer forming hole and the inner forming hole extend from the upper forming surface to the lower forming surface;

[0017] The diagonal groove, the arc groove, and the top groove are all open grooves that are closed at one end.

[0018] Preferably, the external forming hole is strip-shaped;

[0019] The internally formed holes include smooth strip holes and triangular holes at the edges.

[0020] Preferably, the upper mold base has an upper cavity, an upper casting channel and a mold closing groove on its surface, and the upper mold is installed in the upper cavity;

[0021] The upper casting channel is connected to the mold cavity;

[0022] The mold-closing groove is used to close with the lower mold.

[0023] Preferably, the upper mold is provided with a plurality of outer forming blocks, a plurality of arc-shaped protrusions, two diagonal forming blocks and a plurality of inner forming blocks;

[0024] The outer forming block near the edge of the upper mold is used to form an outer forming hole;

[0025] The arc-shaped protrusion is used to form an arc-shaped groove;

[0026] The two diagonal forming blocks are located at opposite corners of the upper mold and are used to form diagonal grooves;

[0027] The internal forming block is used to form internal forming holes.

[0028] Preferably, the lower mold surface is provided with a plurality of outer forming pillars, a plurality of first ejection holes, a plurality of inner forming pillars and two diagonal pillars;

[0029] The outer forming pillar is positioned corresponding to the outer forming hole, and is used to form the outer forming hole by casting after mold closing;

[0030] The first ejection hole corresponds to the ejection slot and is used for the ejector pin assembly to pass through;

[0031] The inner forming column and the inner forming hole are positioned correspondingly and are used to form the inner forming hole by casting after mold closing;

[0032] The two diagonal pillars are located at opposite corners of the lower mold, corresponding to the back of the diagonal groove, and abut against the lower surface of the wax mold after the mold is closed.

[0033] Preferably, the lower mold base surface is provided with a lower cavity, a lower casting channel and a mold closing column;

[0034] The lower cavity is used to install the lower mold. Several second ejection holes and several third ejection holes are opened at the bottom. The several second ejection holes are evenly distributed on the bottom surface of the lower cavity and located inside the third ejection holes. The several third ejection holes are evenly distributed at the edge of the lower cavity and penetrate the entire lower mold base.

[0035] The lower casting channel corresponds to the position of the upper casting channel on the upper mold base and is connected to the cavity.

[0036] The mold closing column slides into the mold closing groove for mold closing.

[0037] Preferably, the ejector assembly includes an ejector seat and a pneumatic cylinder, an ejector plate, a first ejector pin, and a second ejector pin installed inside the ejector seat;

[0038] The ejector seat is fixedly connected to the end of the lower mold seat away from the lower mold.

[0039] The lower surface of the ejector plate is fixedly connected to the telescopic shaft of the pneumatic cylinder, and the first ejector pin and the second ejector pin are mounted on the upper surface of the ejector plate.

[0040] The first ejector pin is a columnar structure with a cross-section of a trapezoidal structure with chamfered corners and a stepped surface at the top. It slides with the third ejector hole to abut against the lower mold surface and block the side of the wax mold, thus ejecting the wax mold.

[0041] The second ejector pin is a columnar structure with a circular cross-section and a stepped surface at the top. It slides with the first ejector hole and the second ejector hole to abut against the ejector groove and eject the wax mold.

[0042] Preferably, cooling channels are also provided in the upper mold base and the lower mold base.

[0043] The beneficial effects of this invention are:

[0044] 1. This invention proposes a wax mold, which is designed to meet product requirements by setting multiple external forming holes, internal forming holes, arc grooves and ejection grooves. The holes or grooves are evenly spaced in multiple layers, and the structure layout is reasonable. It makes full use of the structural features of the ejector pin assembly, the upper mold and the lower mold, so that the fluid can flow quickly and avoid shrinkage and deformation.

[0045] 2. This invention proposes a mold that fully considers the structure of the wax model. Through the combination of the upper mold, the lower mold and the ejector pin assembly, a cavity structure that satisfies the structure of the wax model is formed.

[0046] 3. The ejector assembly of the present invention, by employing a first ejector and a second ejector, ensures that the lower surface and side surface of the wax mold are uniformly subjected to ejection, thereby avoiding mold pulling.

[0047] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 A schematic diagram of the top structure of a wax mold according to the present invention is shown;

[0050] Figure 2 A schematic diagram of the bottom structure of a wax mold according to the present invention is shown;

[0051] Figure 3 A schematic diagram of a split-type mold for a nuclear reactor upper tube seat according to the present invention is shown;

[0052] Figure 4 A schematic diagram showing the fit between the upper mold and the upper mold base is provided.

[0053] Figure 5 A schematic diagram showing the fit between the lower mold and the lower mold base is provided.

[0054] Figure 6 A top view is shown after the lower mold and lower mold base are fitted together;

[0055] Figure 7 A cross-sectional view of a split mold is shown;

[0056] Figure 8 A schematic diagram of the ejector pin assembly is shown;

[0057] Figure 9 The cooling flow path diagrams for the upper and lower mold bases are shown.

[0058] In the diagram: 1. Wax model; 101. Upper mold surface; 102. Diagonal groove; 103. Arc groove; 104. External molding hole; 105. Internal molding hole; 106. Ejection groove; 107. Lower mold surface; 2. Upper mold base; 201. Cooling channel; 202. Upper cavity; 203. Upper casting channel; 204. Mold closing groove; 3. Upper mold; 301. External molding block; 302. Arc protrusion; 303. Diagonal groove 304. Inner forming block; 4. Lower mold; 401. Outer forming pillar; 402. First ejector hole; 403. Inner forming pillar; 404. Diagonal pillar; 5. Lower mold base; 501. Lower cavity; 502. Second ejector hole; 503. Third ejector hole; 504. Lower casting runner; 505. Mold closing pillar; 6. Ejector seat; 7. Pneumatic cylinder; 8. Ejector plate; 9. First ejector pin; 10. Second ejector pin. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] A type of wax model, such as Figure 1 and Figure 2 As shown, the wax model 1 has an upper molded surface 101 on the front and a lower molded surface 107 on the back. The upper molded surface 101 is concave, while the lower molded surface 107 is flat. The entire wax model 1 is rectangular, therefore the upper molded surface 101 is also rectangular. A diagonal groove 102 is formed at one diagonal, and several evenly distributed external forming holes 104 are formed near the edges. Several evenly distributed internal forming holes 105 are formed inside the external forming holes 104. Several evenly distributed arc-shaped grooves 103 are also formed on the surface of the upper molded surface 101. Several ejection grooves 106 are formed on the surface of the lower molded surface 107, with the ejection grooves 106 corresponding one-to-one with the arc-shaped grooves 103. Simultaneously, the external forming holes 104 and the internal forming holes 105 all extend from the upper molded surface 101 to the lower molded surface 107. The diagonal groove 102, the arc-shaped grooves 103, and the ejection grooves 106 are all open grooves closed at one end.

[0061] It should be noted that, in combination Figure 1 and Figure 2It can be seen that the diagonal groove 102 adopts a semi-circular groove structure, located at one diagonal. The remaining positions near the edge all use external forming holes 104. Moreover, the external forming holes 104 are generally strip-shaped holes, but their lengths vary, and they are provided with arc-shaped chamfers. In addition, the external forming holes 104 have the following characteristics in the height direction: the height is lowest near the center of the wax model 1, and the height increases as it moves away from the center of the wax model 1. The area between the highest and lowest points is a smooth curved surface. In addition, on the lower mold surface 107, the opening of the ejector groove 106 slightly extends beyond the lower mold surface 107.

[0062] It should be further explained that the arc-shaped grooves 103 are generally arranged in an array, located in the distribution gaps between the outer forming holes 104 and the inner forming holes 105. The structure of the inner forming holes 105 is quite diverse, including smooth strip holes and triangular holes at the edges. Specifically, in Figure 1 and Figure 2 The distribution trend is as follows:

[0063] First layer: The center is an arc-shaped groove 103;

[0064] The second layer consists of several (optional 8) triangular internal forming holes 105 around the central arc groove 103, forming a ring distribution.

[0065] Third layer: Several (optional 8) strip-shaped internal forming holes 105 are distributed in a rectangular pattern;

[0066] Fourth layer: Several (optional 8) arc-shaped grooves 103 are rectangularly distributed in the gaps between the forming holes 105 in the third layer;

[0067] Fifth layer: Several (optional 8) strip-shaped internal forming holes 105 are distributed in the gaps of the fourth layer;

[0068] Sixth layer: There are several (optional 2) triangular internal forming holes 105 at each of the four diagonals, and several (optional 2) strip-shaped internal forming holes 105 are set between the diagonals;

[0069] Seventh layer: Provide several (optional 8) strip-shaped internal forming holes 105;

[0070] Eighth layer: Set several curved grooves 103, one at each of the four diagonal corners.

[0071] like Figure 3 As shown, a split mold for a nuclear reactor upper tube seat includes an upper mold base 2, a lower mold base 5, and custom components, used for casting the aforementioned wax model 1. The upper mold base 2 houses the upper mold 3 for forming the upper surface 101, and the lower mold base 5 houses the lower mold 4 for forming the lower surface 107. The upper mold 3 and the lower mold 4 are joined to form a cavity for casting the wax model 1, and the ejector pin assembly is used to eject the cast wax model 1.

[0072] like Figure 4 As shown, the upper mold base 2 has an upper cavity 202, an upper casting channel 203 and a mold closing groove 204 on its surface. The upper mold 3 is installed in the upper cavity 202, wherein the upper casting channel 203 is connected to the cavity, and the mold closing groove 204 is used to close with the lower mold 4.

[0073] It should be noted that, in Figure 4 In the middle, because the cavity is relatively complex, the upper casting channel 203 is provided with a gating channel, which is then divided into three branch gating channels. The three branch gating channels are evenly distributed on one side of the cavity.

[0074] Furthermore, such as Figure 4 As shown, the upper mold 3 is provided with a plurality of outer forming blocks 301, a plurality of arc-shaped protrusions 302, two diagonal forming blocks 303 and a plurality of inner forming blocks 304; the outer forming blocks 301 are located near the edges of the upper mold 3 and are used to form outer forming holes 104; the arc-shaped protrusions 302 are used to form arc-shaped grooves 103; the two diagonal forming blocks 303 are located at the diagonals of the upper mold 3 and are used to form diagonal grooves 102; the inner forming blocks 304 are used to form inner forming holes 105.

[0075] Furthermore, such as Figure 5 As shown, the lower mold 4 has several outer forming pillars 401, several first ejection holes 402, several inner forming pillars 403, and two diagonal pillars 404 on its surface. The outer forming pillars 401 are positioned corresponding to the outer forming holes 104 and are used to cast the outer forming holes 104 after mold closing. The first ejection holes 402 are positioned corresponding to the ejection grooves 106 and are used for the ejector pin assembly to pass through. The inner forming pillars 403 are positioned corresponding to the inner forming holes 105 and are used to cast the inner forming holes 105 after mold closing. The two diagonal pillars 404 are located at the diagonal of the lower mold and correspond to the back of the diagonal grooves 102. After mold closing, they abut against the lower surface 107 of the wax model 1.

[0076] It should be noted that, in combination Figure 4 and Figure 5 It can be seen that after the upper mold 3 and the lower mold 4 are closed, the gap between them will form a cavity, and then the fluid will be poured into the cavity. After the fluid cools down, the casting will be formed. Figure 4 and Figure 5 The cavity structures of the upper mold 3 and lower mold 4 correspond to Figure 1 and Figure 2 The wax mold 1 structure in the middle.

[0077] It should be further explained that the structural design of the upper mold 3 and the lower mold 4 fully considers the structural characteristics of the wax mold 1. For example, in order to ensure the formation of the ejector groove 106, a first ejector hole 402 for the ejector pin assembly to pass through is specially reserved; in order to ensure the formation of the outer forming hole 104 and the inner forming hole 105, an outer forming pillar 401, an outer forming block 301, an inner forming pillar 403 and an inner forming block 304 are set; in order to form the arc surface groove 103, an arc surface protrusion 302 is set, etc.

[0078] Furthermore, such as Figure 5 and Figure 6 As shown, the lower mold base 5 has a lower cavity 501, a lower casting channel 504, and a mold clamping post 505 on its surface. The lower cavity 501 is used to install the lower mold 4. The bottom has several second ejection holes 502 and several third ejection holes 503. The several second ejection holes 502 are evenly distributed on the bottom surface of the lower cavity 501 and located inside the third ejection holes 503. The several third ejection holes 503 are evenly distributed at the edge of the lower cavity 501 and penetrate the entire lower mold base 5. The lower casting channel 504 corresponds to the position of the upper casting channel 203 on the upper mold base 2 and communicates with the cavity. The mold clamping post 505 slides with the mold clamping groove 204 for mold clamping.

[0079] It should be noted that the lower casting runner 504 and the upper casting runner 203 are completely corresponding. After the upper mold 3 and the lower mold 4 are closed, the lower casting runner 504 and the upper casting runner 203 form a complete casting channel. In addition, the mold closing pillar 505 will also cooperate with the mold closing groove 204 to close the upper mold base 2 and the lower mold base 5 together.

[0080] Furthermore, such as Figure 7 and Figure 8 As shown, the ejector assembly includes an ejector seat 6 and a pneumatic cylinder 7, an ejector plate 8, a first ejector pin 9, and a second ejector pin 10 installed inside the ejector seat 6. The ejector seat 6 is fixedly connected to the end of the lower mold base 5 away from the lower mold 4. The lower surface of the ejector plate 8 is fixedly connected to the telescopic shaft of the pneumatic cylinder 7. The first ejector pin 9 and the second ejector pin 10 are installed on the upper surface of the ejector plate 8. The first ejector pin 9 is a columnar structure with a trapezoidal cross-section with chamfered edges and a stepped surface at the top. It slides with the third ejector hole 503 to abut against the lower mold surface 107 and block the side of the wax mold 1, ejecting the wax mold 1. The second ejector pin 10 is a columnar structure with a circular cross-section and a stepped surface at the top. It slides with the first ejector hole 402 and the second ejector hole 502 to abut against the ejector groove 106 and eject the wax mold 1.

[0081] It should be noted that the main function of the ejector pin assembly is to eject the wax mold 1 through the ejector pins after the wax mold 1 cools and the upper mold 3 and lower mold 4 separate, allowing the wax mold 1 to be removed. Therefore, the key to the ejector pin assembly lies in the structural design of the first ejector pin 9 and the second ejector pin 10. Figure 8As can be seen, the first ejector pin 9 is cylindrical with an adjustment structure at the top. After mold closing, the first ejector pin 9 forms the ejector groove 106. Additionally, the second ejector pin 10, due to its stepped surface design, uses its horizontal surface to abut against the lower mold surface 107 and its vertical surface to block the side of the wax model 1, thus forming... Figure 1 and Figure 2 The side structure of wax model 1.

[0082] It should be further explained that the first ejector pin 9 and the second ejector pin 10 fully take into account the structure of the wax mold 1, so that the wax mold 1 is ejected evenly, avoiding the situation of mold pulling, and ensuring product quality.

[0083] Furthermore, combined Figure 4 and Figure 9 It can be seen that cooling channels 201 are also provided in the upper mold base 2 and the lower mold base 5.

[0084] It should be noted that cooling channels 201 are provided in both the upper mold base 2 and the lower mold base 5, the purpose of which is to keep the mold cool. In this embodiment, water cooling is used, and the structure consists of two vertical straight channels and one horizontal channel.

[0085] It should be further noted that, in order to further improve the heat dissipation effect, oil cooling channels can be added to the upper mold base 2 and the lower mold base 5, and the oil cooling path can be set according to the actual heat dissipation requirements.

[0086] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A split-type mold for a nuclear reactor upper tube seat, characterized in that, For casting wax molds (1), including upper mold base (2), upper mold (3), lower mold (4), lower mold base (5) and ejector pin assembly; The upper mold (3) is installed in the upper mold base (2) and is used to cast the upper surface (101) of the wax mold (1). The lower mold (4) is installed in the lower mold base (5) and is used to cast the lower surface (107) of the wax mold (1). The upper mold (3) and the lower mold (4) are joined together to form a cavity; The ejector assembly is used to eject the cast wax model (1); The wax model (1) has an upper molded surface (101) on the front and a lower molded surface (107) on the back. The upper surface (101) is recessed inward, and the lower surface (107) is flat. The upper surface (101) is rectangular, with a diagonal groove (102) at one diagonal and several evenly distributed outer forming holes (104) near the edge. Several evenly distributed inner forming holes (105) are also provided inside the outer forming holes (104). The upper surface (101) is also provided with several evenly distributed arc grooves (103). The lower surface (107) has a plurality of ejector grooves (106) on its surface, and the ejector grooves (106) correspond one-to-one with the arc grooves (103).

2. The modular mold for a nuclear reactor upper tube seat according to claim 1, characterized in that, The outer forming hole (104) and the inner forming hole (105) both extend from the upper molded surface (101) to the lower molded surface (107). The diagonal groove (102), the arc groove (103), and the ejector groove (106) are all open grooves with one end closed.

3. The modular mold for a nuclear reactor upper tube seat according to claim 2, characterized in that, The external forming hole (104) is strip-shaped; The internally formed hole (105) includes a strip hole and a triangular hole with smooth edges.

4. A split-type mold for a nuclear reactor upper tube seat according to claim 3, characterized in that, The upper mold base (2) has an upper cavity (202), an upper casting channel (203) and a mold closing groove (204) on its surface, and the upper mold (3) is installed in the upper cavity (202); The upper casting channel (203) is connected to the mold cavity; The mold closing groove (204) is used to close with the lower mold (4).

5. A split-type mold for a nuclear reactor upper tube seat according to claim 4, characterized in that, The upper mold (3) is provided with a number of outer forming blocks (301), a number of arc-shaped protrusions (302), two diagonal forming blocks (303) and a number of inner forming blocks (304). The outer forming block (301) is located near the edge of the upper mold (3) and is used to form an outer forming hole (104). The arc-shaped protrusion (302) is used to form the arc-shaped groove (103); The two diagonal forming blocks (303) are located at opposite corners of the upper mold (3) and are used to form diagonal grooves (102). The inner forming block (304) is used to form an inner forming hole (105).

6. A split-type mold for a nuclear reactor upper tube seat according to claim 4, characterized in that, The surface of the lower mold (4) is provided with a plurality of outer forming pillars (401), a plurality of first ejection holes (402), a plurality of inner forming pillars (403) and two diagonal pillars (404). The outer forming column (401) is positioned corresponding to the outer forming hole (104) and is used to form the outer forming hole (104) by casting after mold closing. The first ejector hole (402) corresponds to the ejector groove (106) and is used for the ejector pin assembly to pass through; The inner forming column (403) is positioned corresponding to the inner forming hole (105) and is used to form the inner forming hole (105) after mold closing. The two diagonal pillars (404) are located at the diagonal corners of the lower mold, corresponding to the back of the diagonal groove (102), and abut against the lower surface (107) of the wax model (1) after the mold is closed.

7. A split-type mold for a nuclear reactor upper tube seat according to claim 6, characterized in that, The lower mold base (5) has a lower cavity (501), a lower casting channel (504) and a mold closing column (505) on its surface. The lower cavity (501) is used to install the lower mold (4). The bottom is provided with a number of second ejection holes (502) and a number of third ejection holes (503). The number of second ejection holes (502) are evenly distributed on the bottom surface of the lower cavity (501) and located inside the third ejection holes (503). The number of third ejection holes (503) are evenly distributed at the edge of the lower cavity (501) and penetrate the entire lower mold base (5). The lower casting channel (504) corresponds to the upper casting channel (203) on the upper mold base (2) and is connected to the cavity; The mold closing column (505) slides with the mold closing groove (204) for mold closing.

8. A split-type mold for a nuclear reactor upper tube seat according to claim 7, characterized in that, The ejector assembly includes an ejector seat (6) and a pneumatic cylinder (7), an ejector plate (8), a first ejector pin (9), and a second ejector pin (10) installed inside the ejector seat (6). The ejector seat (6) is fixedly connected to the end of the lower mold seat (5) away from the lower mold (4); The lower surface of the ejector plate (8) is fixedly connected to the telescopic shaft of the pneumatic cylinder (7), and the first ejector pin (9) and the second ejector pin (10) are installed on the upper surface of the ejector plate (8). The first ejector pin (9) is a columnar structure with a cross-section of a trapezoidal structure with chamfered corners and a stepped surface at the top. It slides with the third ejector hole (503) to abut against the lower mold surface (107) and block the side of the wax mold (1) to eject the wax mold (1). The second ejector pin (10) is a columnar structure with a circular cross-section and a stepped surface at the top. It slides with the first ejector hole (402) and the second ejector hole (502) to abut against the ejector groove (106) and eject the wax mold (1).

9. A split-type mold for a nuclear reactor upper tube seat according to any one of claims 4-8, characterized in that, Cooling channels (201) are also provided in the upper mold base (2) and the lower mold base (5).

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