Water-soluble sand core mold for winding shell with large length-diameter ratio

Abstract

The utility model relates to a water-soluble sand core mold for a winding shell with a large length-diameter ratio. The water-soluble sand core mold comprises a core shaft and a plurality of sand core structures which are detachably arranged on the core shaft in a sleeving manner, the sand core structure comprises a shaft sleeve and a sand cake connected to the outer side of the shaft sleeve. The shaft sleeve comprises a sleeve, first annular protrusions arranged on the outer side faces of the two opposite ends of the sleeve, and second annular protrusions arranged on the inner side faces of the two opposite ends of the sleeve. The second annular protrusion is connected with the central spindle in a sleeved mode in a matched mode. A key groove and a flat key detachably connected with the key groove are arranged at the position, corresponding to the second annular protrusion, of the mandrel. The second annular protrusion is provided with an embedding notch matched with the flat key.

Description

Technical Field

[0001] The utility model relates to the technical field of sand core mold structures, in particular to a water-soluble sand core mold for winding a shell with a large aspect ratio. Background Art

[0002] Filament winding is a highly efficient and designable process, making it a common method for composite rotor shells. Since the winding process must be performed on a core mold, the manufacturing cost and ease of use of the core mold significantly impact the cost and production efficiency of the winding process. Currently, winding core molds are divided into metal removable molds and non-metallic soluble molds. Metal core molds are more complex to manufacture and use, so soluble sand core molds are often used, as they are more convenient and less expensive.

[0003] For sand core molds with large aspect ratios, a segmented sand cake forming method is typically used. A die and a sand cake positioning sleeve serve as the forming mold to create the sand cake. The sand cake is then sequentially fitted onto a metal mandrel, and the outer diameter of the sand cake is machined throughout. Existing designs typically utilize a stepped mandrel. The first sleeve section is positioned against a step on the mandrel. The subsequent sections are joined end to end, and the final sleeve section is locked with a round nut. The inner diameter of each metal sleeve section changes with the mandrel step, while the outer diameter of each sleeve remains constant.

[0004] Existing sand core mold designs for large aspect ratios require a large contact area between the sand cake positioning sleeve and the mandrel. If the mandrel undergoes slight deformation during use, storage, or transportation, this can increase friction between the sleeve and the mandrel, potentially making assembly and disassembly difficult. Shortening the sand cake length to minimize the impact of mandrel deformation increases the number of sand cakes, reduces production efficiency, and increases costs. Furthermore, when the sand cake diameter is small, the inner surface of the sand cake positioning sleeve must be machined deeply, making it difficult to manufacture and placing high demands on processing equipment, which in turn increases costs. Utility Model Content

[0005] The utility model aims to provide a water-soluble sand core mold for winding a shell with a large aspect ratio.

[0006] To achieve the above-mentioned purpose of the utility model, the utility model provides a water-soluble sand core mold for winding a shell with a large aspect ratio, comprising: a core shaft, and a plurality of sand core structures detachably sleeved on the core shaft;

[0007] The sand core structure includes: a shaft sleeve and a sand cake connected to the outside of the shaft sleeve;

[0008] The sleeve includes: a sleeve, a first annular protrusion provided on the outer side surfaces at opposite ends of the sleeve, and a second annular protrusion provided on the inner side surfaces at opposite ends of the sleeve;

[0009] The second annular protrusion is sleeve-connected to the core shaft in a matching manner;

[0010] A keyway and a flat key detachably connected to the keyway are provided at a position of the core shaft corresponding to the second annular protrusion;

[0011] The second annular protrusion is provided with a fitting notch matching the flat key.

[0012] According to one aspect of the present utility model, the sleeve further comprises: a sand consolidation rod;

[0013] The sand consolidation rod is fixedly connected to the outer surface of the sleeve, and the axial direction of the sand consolidation rod is parallel to the axial direction of the sleeve;

[0014] The sand consolidation rod is arranged between two opposite first annular protrusions.

[0015] According to one aspect of the present invention, a plurality of sand consolidation rods are arranged at intervals along the circumference of the sleeve;

[0016] There are 2 to 4 sand consolidation rods.

[0017] According to one aspect of the present invention, adjacent sand core structures are arranged to abut against each other in sequence along the axial direction of the core shaft, and the second annular protrusions of the sleeves of adjacent sand core structures are engaged and connected with the same flat key.

[0018] According to one aspect of the present invention, the core shaft includes: a first shaft segment, a connecting shaft body coaxially connected to the first shaft segment, a second shaft segment coaxially connected to the connecting shaft body, and a locking nut;

[0019] The first shaft segment and the second shaft segment are respectively located at opposite ends of the connecting shaft body;

[0020] The diameter of one end of the first shaft segment connected to the connecting shaft body is larger than the diameter of the connecting shaft body;

[0021] The diameter of the second shaft segment is smaller than the diameter of the connecting shaft body, and one end of the second shaft segment connected to the connecting shaft body is provided with a thread for the locking nut to be screwed together.

[0022] According to one aspect of the present invention, the keyway is provided on the connecting shaft;

[0023] Along the direction from the first shaft section to the second shaft section, the widths of the plurality of keyways are arranged to decrease in sequence.

[0024] According to one aspect of the present invention, the width of the first annular protrusion and the second annular protrusion is 5-20 mm.

[0025] According to one aspect of the present invention, the aspect ratio of the sleeve is: 5-10:1;

[0026] The opposite ends of the shaft sleeve are respectively provided with eye screw holes;

[0027] On the end surface of each of the shaft sleeves, 2 to 4 eyebolt screw holes are provided.

[0028] According to one aspect of the present invention, the aspect ratio of the connecting shaft is 20-30:1.

[0029] According to one aspect of the present invention, the core shaft further comprises: two adapter blocks;

[0030] The two adapter blocks are detachably connected to the first shaft segment and the second shaft segment respectively;

[0031] The adapter block includes: an adapter block body;

[0032] One end of the adapter block body is provided with an engaging hole for connecting with the end of the first shaft segment or the second shaft segment;

[0033] The adapter block body has a first positioning pin hole at one end thereof where the fitting hole is provided, and a mounting hole at the other end thereof;

[0034] The first positioning pin hole is connected to the fitting hole;

[0035] Ends of the first shaft segment and the second shaft segment are provided with second positioning pin holes corresponding to the first positioning pin holes.

[0036] According to a solution of the utility model, the utility model creatively reduces the assembly contact area between the sleeve and the core shaft, transforms the continuous contact along the axial direction into discrete contact, reduces the difficulty of disassembly and assembly, and avoids the micro-deformation of the core shaft during storage or transportation from getting stuck in the positioning sleeve. At the same time, the utility model has designability and can adjust the flange width and height according to the weight and outer diameter of the sand cake.

[0037] According to a solution of the present invention, the length of the shaft sleeve of the present invention can be adjusted arbitrarily, and the purpose can also be achieved by shortening the length. Considering the production efficiency, a suitable aspect ratio can be flexibly adopted.

[0038] According to a solution of the present invention, the present invention reduces the difficulty of processing and the difficulty of installing and demoulding the multi-section sand core structure, reduces processing costs, and improves production efficiency.

[0039] According to one solution of the present invention, by providing a second annular protrusion on the inner side of the sleeve to cooperate with the core shaft, the present invention can effectively reduce the contact area between the entire sleeve and the core shaft, thereby effectively reducing the friction during the installation of the sleeve and the core shaft, thereby effectively improving the installation convenience and efficiency of the sleeve and the core shaft of the present invention. In particular, when the entire sand core structure includes a heavy sand cake, the friction during the installation of the sand core structure can be more effectively reduced, making the installation of the present invention easier.

[0040] According to one solution of the present invention, the connecting shaft body of the present invention can be set as a circular shaft with a constant diameter, which has a simple structure and is easy to manufacture, thereby greatly improving the production efficiency of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 Schematically shows the structure of a water-soluble sand core mold according to one embodiment of the present invention;

[0042] Figure 2 It is a schematic representation Figure 1 A magnified view of position A in the middle;

[0043] Figure 3 Schematically shows the structure of a shaft sleeve according to an embodiment of the present invention;

[0044] Figure 4 It is a schematic representation Figure 3 Cross-section at the mid-BB position;

[0045] Figure 5 is a structural diagram schematically showing a core shaft according to an embodiment of the present utility model;

[0046] Figure 6 is a structural diagram schematically showing a switching block according to an embodiment of the present utility model;

[0047] Figure 7 It is a diagram schematically showing a molding structure of a sand core structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0049] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms cannot be understood as limiting the present invention.

[0050] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0051] Combine Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, a water-soluble sand core mold for a large aspect ratio winding shell includes: a core shaft 1, and multiple sand core structures 2 detachably mounted on the core shaft 1. In this embodiment, the core shaft 1 serves as a supporting structure for the multiple sand core structures 2, and is used to fix the sand core structures 2 while driving the multiple sand core structures 2 to rotate as a whole via a driver. In this embodiment, the sand core structure 2 includes: a sleeve 21 and a sand cake 22 connected to the outside of the sleeve 21. The sleeve 21 includes: a sleeve 211, first annular protrusions 212 provided on the outer side surfaces of the sleeve 211 at opposite ends, and second annular protrusions 213 provided on the inner side surfaces of the sleeve 211 at opposite ends. In this embodiment, the second annular protrusions 213 are connected to the core shaft 1 in a sleeve-like manner, that is, the sleeve 21 is supported on the core shaft 1 based on the second annular protrusions 213. Furthermore, to enable the core shaft 1 and sleeve 21 to rotate together, a keyway 1a and a flat key 1b detachably connected to the keyway 1a are provided at a position on the core shaft 1 corresponding to the second annular protrusion 213. The second annular protrusion 213 is provided with a mating notch that matches the flat key 1b. When the sleeve 21 is connected to the core shaft 1, the mating notch in the second annular protrusion 213 mates with the flat key 1b, achieving a transmission connection between the sleeve 21 and the core shaft 1.

[0052] Through the above arrangement, the present invention can effectively reduce the contact area between the entire sleeve 211 and the core shaft 1 by providing a second annular protrusion 213 on the inner side of the sleeve 211 to cooperate with the core shaft 1, thereby effectively reducing the friction during the installation process of the sleeve 21 and the core shaft 1, thereby effectively improving the installation convenience and installation efficiency of the sleeve 21 and the core shaft 1 of the present invention. In particular, when the entire sand core structure 2 includes a heavy sand cake 22, the friction during the installation process of the sand core structure 2 can be more effectively reduced, making the installation of the present invention easier.

[0053] Combine Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, the second annular protrusion 213 of the sleeve 21 is connected to the core shaft 1 in a clearance fit manner.

[0054] Through the above arrangement, the sleeve 21 is clearance-fitted with the core shaft 1 through the second annular protrusion 213 , thereby effectively reducing the friction between the sleeve 21 and the core shaft 1 during the installation process, thereby improving the convenience of the installation process.

[0055] Combine Figure 2 、 Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, the sleeve 21 further includes a sand consolidation rod 214. The sand consolidation rod 214 is fixedly connected to the outer surface of the sleeve 211, and the axial direction of the sand consolidation rod 214 is arranged parallel to the axial direction of the sleeve 211. Specifically, the sand consolidation rod 214 can be mounted to the sleeve 211 by welding. In this embodiment, the sand consolidation rod 214 is disposed between two opposing first annular protrusions 212. The length of the sand consolidation rod 214 is consistent with the spacing between the two opposing first annular protrusions 212, thereby ensuring that the sand consolidation rod 214 is fixedly connected to the side surfaces of the first annular protrusions 212. Of course, the length of the sand consolidation rod 214 can also be set to be less than the spacing between the two opposing first annular protrusions 212. Thus, the sand consolidation rod 214 can be flexibly disposed at different positions according to the axial length of the sleeve 211.

[0056] Through the above-mentioned arrangement, by arranging the sand consolidation rod 214 on the shaft sleeve 21, the connection stability with the sand cake 22 can be effectively guaranteed, and the relative sliding between the sand cake 22 and the sleeve 211 can be effectively suppressed, making the sand core structure 2 of the present invention more reliable.

[0057] like Figure 3As shown, according to one embodiment of the present invention, multiple sand consolidation rods 214 are spaced apart along the circumference of the sleeve 21. In this embodiment, two to four sand consolidation rods 214 are provided. In this embodiment, the sand consolidation rods 214 can be round rods with smooth or rough surfaces, further increasing friction at the connection point with the sand cake 22 and improving connection reliability.

[0058] like Figure 2 As shown, according to one embodiment of the present invention, adjacent sand core structures 2 are sequentially abutted along the axial direction of the core shaft 1, and the second annular protrusions 213 of the sleeves 21 of adjacent sand core structures 2 are engaged with the same flat key 1b. In this embodiment, the ends of the sleeves 21 of two adjacent sand core structures 2 abut against each other to ensure reliable installation and positioning of the adjacent sand core structures 2. Accordingly, the sand cakes 22 of two adjacent sand core structures 2 also abut against each other to ensure a tight fit, thereby ensuring reliable and accurate preparation of the wound shell.

[0059] like Figure 5 As shown, according to one embodiment of the present invention, the core shaft 1 includes: a first shaft segment 11, a connecting shaft 12 coaxially connected to the first shaft segment 11, a second shaft segment 13 coaxially connected to the connecting shaft 12, and a locking nut 14. The first shaft segment 11 and the second shaft segment 13 are located at opposite ends of the connecting shaft 12. In this embodiment, the diameter of the end of the first shaft segment 11 connected to the connecting shaft 12 is larger than the diameter of the connecting shaft 12. This creates an abutment step between the first shaft segment 11 and the connecting shaft 12, thereby securing the first installed sand core structure 2 against the abutment. Furthermore, the diameter of the second shaft segment 13 is smaller than the diameter of the connecting shaft 12, and the end of the second shaft segment 13 connected to the connecting shaft 12 is provided with threads for engagement with the locking nut 14. This arrangement of the second shaft segment 13 facilitates the installation of the sand core structure 2. After installation, the locking nut 14 secures multiple sand core structures 2 against each other.

[0060] like Figure 5 As shown, according to one embodiment of the present invention, a key groove 1a is provided on the connecting shaft 12; wherein, along the axial direction of the connecting shaft 12, a plurality of key grooves 1a are arranged in a linear manner, wherein the key groove 1a is provided at the position where the second annular protrusion 213 contacts the connecting shaft 12. Thus, the first key groove 1a is provided starting from the position where the connecting shaft 12 is connected to the first shaft section 11. Furthermore, the widths of the plurality of key grooves 1a are successively reduced along the direction from the first shaft section 11 to the second shaft section 13. In this embodiment, the widths of the plurality of key grooves 1a are provided in a step-wise manner along the direction from the first shaft section 11 to the second shaft section 13.

[0061] Through the above-mentioned setting, by setting the keyway 1a at the position corresponding to the second annular protrusion 213 on the connecting shaft body 12, the mutual limiting connection can be further achieved through the embedded flat key 1b. Furthermore, by setting the width of multiple keyways 1a to decrease in sequence, the anti-mistake effect of the installation direction and position of the sleeve 21 during the installation process can be achieved, and the sleeve 21 can be more conveniently and smoothly installed in sequence on the connecting shaft body 12.

[0062] like Figure 4 As shown, according to one embodiment of the present invention, the width of the first annular protrusion 212 and the second annular protrusion 213 is 5 to 20 mm.

[0063] Through the above-mentioned setting, the first annular protrusion 212 and the second annular protrusion 213 are set within the above-mentioned width range, so that there is a sufficient contact area between the shaft sleeve 21 and the connecting shaft body 12 in the utility model, so as to effectively avoid the influence of local stress concentration on the overall axial accuracy of the connecting shaft body 12, especially to avoid the damage to the assembly surface of the connecting shaft body 12 caused by excessive local stress due to a small contact surface.

[0064] like Figure 3 As shown, according to one embodiment of the present invention, the aspect ratio of the sleeve 21 is 5-10:1.

[0065] Through the above-mentioned arrangement, the rationality of the aspect ratio of the sleeve 21 is effectively guaranteed, which not only avoids the structural unreliability caused by the overall thickness of the sand core structure 2 being too thin due to the aspect ratio of the sleeve 21 being too small, but also effectively avoids the disadvantage that the strength of the sleeve 21 is insufficient and it is easy to be affected by the weight of the sand cake 22 and deformed due to the aspect ratio of the sleeve 21 being too large.

[0066] According to an embodiment of the present invention, eye screw holes are respectively provided at opposite ends of the shaft sleeve 21 ; wherein, 2 to 4 eye screw holes are provided on the end surface of each shaft sleeve 21 .

[0067] Through the above arrangement, it is convenient to connect the lifting ring to the shaft sleeve 21, so as to facilitate the overall lifting of the sand core structure 2, and thus facilitate the sequential installation of the sand core structure 2 on the core shaft 1 with the help of lifting tools.

[0068] like Figure 5 As shown, according to one embodiment of the present invention, the aspect ratio of the connecting shaft 12 is 20-30:1. This arrangement effectively ensures a reasonable aspect ratio of the connecting shaft 12, avoiding the drawbacks of the connecting shaft 12 being too small in aspect ratio, resulting in a small size and heavy weight, and also effectively avoiding the drawbacks of the connecting shaft 12 being too large in aspect ratio, resulting in insufficient strength and susceptibility to deformation caused by the sand core structure 2.

[0069] Combine Figure 1 、 Figure 5 and Figure 6 As shown, according to one embodiment of the present invention, the core shaft 1 further includes two adapter blocks 15, wherein the two adapter blocks 15 are detachably connected to the first shaft segment 11 and the second shaft segment 13, respectively. In this embodiment, the adapter block 15 includes an adapter block body 151, wherein one end of the adapter block body 151 is provided with an engagement hole 151a for connecting with the end of the first shaft segment 11 or the second shaft segment 13. In this embodiment, the engagement hole 151a is configured according to the end size of the connected shaft segment (the first shaft segment 11 or the second shaft segment 13). In this embodiment, a first positioning pin hole 151b is provided at one end of the adapter block body 151 where the fitting hole 151a is provided, and a mounting hole 151c is provided at the other end. The axes of the first positioning pin hole 151b and the mounting hole 151c are both perpendicular to the axis of the adapter block body 151. The first positioning pin hole 151b is connected to the fitting hole 151a, while the mounting holes 151c are provided on opposite sides of the adapter block body 151. In this embodiment, the mounting holes 151c can be threaded holes.

[0070] In this embodiment, the ends of the first shaft segment 11 and the second shaft segment 13 are provided with second positioning pin holes corresponding to the first positioning pin holes 151 b .

[0071] Through the above arrangement, by respectively installing the adapter blocks 15 on the opposite sides of the core shaft 1, a lifting ring can be installed in the mounting hole 151c to facilitate the overall lifting of the present invention in the horizontal direction, thereby improving the installation convenience of the present invention.

[0072] like Figure 5 As shown, according to one embodiment of the present invention, the core shaft 1 can be made of quality-treated 45# steel, or other alloy steels. In this embodiment, the surface hardness of the core shaft 1 is HRC30-35.

[0073] In order to further illustrate this solution, the method for using the water-soluble sand core mold of the utility model is further described.

[0074] Step 1: Mix quartz sand and polyvinyl alcohol aqueous solution and stir evenly, then spread out and let it air-dry for use;

[0075] Step 2: Assemble the pre-set concave die A of the sand cake 22 forming die, the shaft sleeve 21 and the positioning base plate B by nesting them, and use the screw and nut pair C to lock the positioning base plate B, the shaft sleeve 21 and the cover plate D. Figure 7 ;

[0076] Step 3: Pour the mixed sand into the concave mold A, pouring the sand into the depth of 5~10mm each time, and then tamp it with a tool. After tamping, continue pouring the sand;

[0077] Step 4: Repeat step 3 until the sand material is more than 10 mm above the top of the sleeve 21 after the last tamping;

[0078] Step 5: Send to oven for drying and curing;

[0079] Step 6: Remove the solidified sand cake 22 together with the shaft sleeve 21 from the die A, and process the contact end surfaces of the adjacent sand cakes 22 to be flush with the end surface of the shaft sleeve 21;

[0080] Step 7: Install the flat key 1b on the core shaft 1, use the assembly tool to keep the core shaft 1 vertical, install the eye screw on the end face of the sleeve 21, lift the sleeve 21 with a crane, and manually install it on the core shaft 1 from top to bottom;

[0081] Step 8: According to step 7, put each section of the sand core structure 2 onto the core shaft 1 in sequence, apply a layer of epoxy structural glue between each section, and finally lock the tail end with a round nut;

[0082] Step 9: After the epoxy glue is cured, turn the sand core structure 2 into shape and repair the outer surface with putty after completion.

[0083] Step 10: After the winding and curing is completed, the sand cake 22 on the sand core structure 2 is rinsed with water to dissolve it;

[0084] Step 11: After cleaning off the quartz sand, pull the core shaft 1 together with the sleeves 21 from the front end to complete demoulding;

[0085] Step 12: Disassemble each section of the shaft sleeve 21 and repeat steps 1 to 11 to achieve cyclic production.

[0086] The above contents are merely examples of specific solutions of the present invention. For devices and structures not described in detail, it should be understood that they can be implemented by adopting common devices and methods available in the art.

[0087] The above description is only one embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A water-soluble sand core mold for a winding shell with a large aspect ratio, characterized in that: include: A core shaft (1), and a plurality of sand core structures (2) detachably sleeved on the core shaft (1); The sand core structure (2) comprises: a shaft sleeve (21) and a sand cake (22) connected to the outside of the shaft sleeve (21); The shaft sleeve (21) comprises: a sleeve (211), first annular protrusions (212) provided on the outer side surfaces at two opposite ends of the sleeve (211), and second annular protrusions (213) provided on the inner side surfaces at two opposite ends of the sleeve (211); The second annular protrusion (213) is sleeve-connected to the core shaft (1); A keyway (1a) and a flat key (1b) detachably connected to the keyway (1a) are provided at a position of the core shaft (1) corresponding to the second annular protrusion (213); The second annular protrusion (213) is provided with a fitting notch that matches the flat key (1b).

2. The water-soluble sand core mold according to claim 1, characterized in that: The shaft sleeve (21) further includes: a sand consolidation rod (214); The sand consolidation rod (214) is fixedly connected to the outer surface of the sleeve (211), and the axial direction of the sand consolidation rod (214) is arranged parallel to the axial direction of the sleeve (211); The sand consolidation rod (214) is arranged between two opposite first annular protrusions (212).

3. The water-soluble sand core mold according to claim 2, characterized in that: Along the circumference of the shaft sleeve (21), a plurality of sand consolidation rods (214) are arranged at intervals; There are 2 to 4 sand consolidation rods (214).

4. The water-soluble sand core mold according to claim 3, characterized in that: Along the axial direction of the core shaft (1), adjacent sand core structures (2) are arranged to abut against each other in sequence, and the second annular protrusions (213) of the shaft sleeves (21) of the adjacent sand core structures (2) are engaged and connected with the same flat key (1b).

5. The water-soluble sand core mold according to claim 4, characterized in that: The core shaft (1) comprises: a first shaft section (11), a connecting shaft body (12) coaxially connected to the first shaft section (11), a second shaft section (13) coaxially connected to the connecting shaft body (12), and a locking nut (14); The first shaft section (11) and the second shaft section (13) are respectively located at opposite ends of the connecting shaft body (12); The diameter of one end of the first shaft section (11) connected to the connecting shaft body (12) is larger than the diameter of the connecting shaft body (12); The diameter of the second shaft section (13) is smaller than the diameter of the connecting shaft body (12), and one end of the second shaft section (13) connected to the connecting shaft body (12) is provided with a thread for screwing the locking nut (14).

6. The water-soluble sand core mold according to claim 5, characterized in that: The keyway (1a) is provided on the connecting shaft (12); Along the direction from the first shaft section (11) to the second shaft section (13), the widths of the plurality of key slots (1a) are arranged to decrease in sequence.

7. The water-soluble sand core mold according to claim 6, characterized in that: The width of the first annular protrusion (212) and the second annular protrusion (213) is 5 to 20 mm.

8. The water-soluble sand core mold according to claim 7, characterized in that: The aspect ratio of the shaft sleeve (21) is 5-10:1; The opposite ends of the shaft sleeve (21) are respectively provided with eyelet screw holes; On the end surface of each of the shaft sleeves (21), 2 to 4 eyebolt screw holes are provided.

9. The water-soluble sand core mold according to claim 8, characterized in that: The length-to-diameter ratio of the connecting shaft (12) is 20-30:

1.

10. The water-soluble sand core mold according to claim 9, characterized in that: The core shaft (1) further comprises: two adapter blocks (15); The two adapter blocks (15) are detachably connected to the first shaft segment (11) and the second shaft segment (13), respectively; The adapter block (15) comprises: an adapter block main body (151); One end of the adapter block body (151) is provided with a fitting hole (151a) for connecting with the end of the first shaft segment (11) or the second shaft segment (13); The adapter block body (151) is provided with a first positioning pin hole (151b) at one end thereof where the fitting hole (151a) is provided, and a mounting hole (151c) is provided at the other end thereof; The first positioning pin hole (151b) is arranged to communicate with the fitting hole (151a); The ends of the first shaft segment (11) and the second shaft segment (13) are provided with second positioning pin holes corresponding to the first positioning pin holes (151b).

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