Self-adaptive mold adjusting device for wind power gear box casting

Abstract

The invention relates to the technical field of casting molds, and particularly discloses a self-adaptive adjusting mold device for wind power gear box casting, the self-adaptive adjusting mold device comprises an upper mold and a lower mold, the lower mold comprises a top mold, a plurality of compound molds and a bottom mold which can be stacked, the bottom of the bottom mold is provided with an ejection hole, and the bottom of the lower mold is provided with a jacking mechanism; under the condition that the bottom die is not replaced, the height of the lower die can be adjusted only by increasing or decreasing the number of the compound dies. The jacking mechanism arranged at the bottom of the lower mold can provide stable and reliable auxiliary demolding force for the casting, the adhesive force between the casting and a mold cavity and the wrapping force of molding sand can be effectively overcome, the tensile stress to the casting during demolding is reduced, and the risks of cracks, deformation and other defects of the casting are reduced. When the hydraulic push rod drives the assembly plate to move, the supporting frame can be unfolded or contracted along with the assembly plate, the supporting position is automatically adjusted to the center area of the assembly plate, center supporting force is provided for the assembly plate, and the stability of the assembly plate in the stress state is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of casting moulds, in particular to a self-adapting adjustment mould device for casting a wind power gearbox. Background Art

[0002] As the core transmission component of a wind turbine generator set, the performance and reliability of a wind turbine gearbox are directly related to the power generation efficiency and operating life of the entire wind turbine. Wind turbine gearboxes are typically complex in structure, large in size, and bear high loads, placing extremely high demands on their manufacturing precision and material properties. Casting, as one of the main processes for producing large, complex metal parts, plays a vital role in the production of wind turbine gearbox blanks. In the traditional design of wind turbine gearbox casting molds, the molds are customized for specific types of gearboxes, forming an integral or semi-integral structure. This design method has significant disadvantages: First, when it is necessary to produce different types of gearboxes, the entire set of molds must be replaced or large-scale modifications must be carried out, resulting in high mold manufacturing costs and long production preparation cycles, making it difficult to adapt to the market demand for wind power industry products with many models and rapid updates; second, for large wind turbine gearbox castings, demolding is a technical difficulty. Traditional molds may require complex demolding auxiliary devices, and when large castings cool and shrink unevenly, the demolding process can easily damage the castings or cause mold wear; third, the molds have poor versatility and interchangeability, which is not conducive to standardized production and inventory management, and also increases the complexity of production management; Therefore, the prior art urgently needs an adaptive adjustment mold device that can adapt to the casting requirements of different types of gearboxes, facilitate rapid replacement and adjustment, and effectively solve the demolding problem of large castings. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the present invention provides an adaptive adjustment mold device for wind power gearbox casting, which solves the problem that the existing gearbox sandbox is fixed and inconvenient to replace and adjust, as well as inconvenient to demould.

[0004] To achieve the above-mentioned object, the present invention is implemented through the following technical solutions: an adaptive adjustment mold device for casting a wind turbine gearbox, comprising an upper mold and a lower mold, wherein the upper mold can be buckled on the lower mold, and the lower mold comprises a stackable top mold, multiple composite molds and a bottom mold, wherein the outer walls of the top mold and the bottom mold are each provided with multiple wing ears in the circumferential direction, and the wing ears of the outer walls of the top mold and the bottom mold are fixed into one body by a fixing assembly, and the multiple composite molds are clamped and fixed between the top mold and the bottom mold; An ejection hole is opened at the bottom of the bottom mold, and a lifting mechanism is provided at the bottom of the lower mold, and the output end of the lifting mechanism is located at the ejection hole.

[0005] Preferably, the fixing assembly includes a screw rod, which passes through the wing ears of the outer walls of the top mold and the bottom mold. A plurality of nuts are threaded onto the screw rod, and every two of the nuts are clamped at the upper and lower ends of each wing ear.

[0006] Preferably, an upper stepped opening is circumferentially provided at the bottom end of the top mold, and a lower stepped opening is circumferentially provided at the top end of the bottom mold, and the upper stepped opening is adapted to the lower stepped opening.

[0007] Preferably, each of the compound molds is circumferentially provided with compound stepped openings at the top and bottom ends, and the compound stepped openings are respectively matched with the upper stepped opening and the lower stepped opening.

[0008] Preferably, the lifting mechanism includes: an assembly plate, a propulsion assembly, a lifting rod assembly and a top cap; the propulsion assembly is arranged below the assembly plate, pushing and pulling the assembly plate up and down; the lifting rod assembly is arranged on the assembly plate; the top cap is arranged on the lifting rod assembly and is located in the ejection hole.

[0009] Preferably, the lifting rod assembly includes: a base tube, a mandrel, an air nozzle, an air cavity and an air supply pipe; the base tube is fixedly connected to the assembly plate; the mandrel is inserted into the base tube, and the top end passes through the base tube, and the top cap is arranged on the top end of the mandrel; the air nozzle is arranged on the circumference of the top of the mandrel, and the air outlet is arranged toward the ejection hole; the air cavity is formed in the mandrel and is connected to the air nozzle; An air supply pipe is communicated with the base cylinder, and an electromagnetic valve is provided on the air supply pipe.

[0010] Preferably, the lifting rod assembly also includes: a sealing plate, a piston disc, a lifting rod, a cam and a driving motor; the sealing plate is arranged in the base cylinder, dividing the inner cavity of the base cylinder into an inflation cavity and a lower cavity, and the lifting rod is located in the inflation cavity; the piston disc is fixed to the bottom of the lifting rod, and a sealing ring is arranged circumferentially; the lifting rod is arranged at the bottom of the piston disc, and the bottom end of the lifting rod passes through the sealing plate and is inserted into the lower cavity; the roller is rotatably connected to the bottom of the lifting rod; the cam is rotatably connected in the lower cavity, and the outer wall surface conflicts with the roller; the driving motor is fixed on the base cylinder, and the output end is connected to the cam.

[0011] Preferably, the air cavity includes: a central cavity, an air inlet, a gap cavity and several branch air cavities; the central cavity is opened at the center of the inner part of the push rod, including a first compression cavity, a second compression cavity and a third compression cavity whose diameters decrease in a step-like manner from bottom to top; the air inlet is opened on the outer wall of the push rod and communicates with the central cavity; the gap cavity is opened above the central cavity; the top ends of the several branch air cavities are communicated with each air nozzle, and the bottom ends are communicated with the gap cavity.

[0012] Preferably, the propulsion assembly includes: a bottom trough box, a hydraulic push rod, two side support plates and a support frame; the bottom trough box is set on a fixed object; the hydraulic push rod is fixed in the bottom trough box, and the output end is fixed to the assembly plate; the two side support plates are slidably connected to both sides of the assembly plate; the support frame is hingedly set between the assembly plate and the two side support plates.

[0013] Preferably, limit plates are provided on both sides of the assembly plate; a sliding groove is provided on the outer wall of the assembly plate, and a slider that can slide in the sliding groove is provided on the inner wall of the side support plate.

[0014] Beneficial effects of the present invention: By using the self-adaptive adjustment mold device for wind power gearbox casting provided by the present invention, the following technical effects are achieved: 1. The lower mold consists of stackable modules, including a top mold, a composite mold, and a bottom mold. The number of composite molds can be easily increased or decreased based on the model and size of the gearbox to be cast, allowing precise adjustment of the overall height and cavity size of the lower mold. This allows the same mold system to accommodate the casting needs of various wind turbine gearbox specifications, eliminating the need to design and manufacture molds for each model. This significantly reduces mold manufacturing costs and inventory pressure, shortens production preparation time, and improves the flexibility and intelligence of the production line.

[0015] 2. When changing molds to produce different gearbox models, the lower mold height can be adjusted simply by adding or removing the re-molding mold, without replacing the base mold. Compared to the traditional method of replacing the entire mold, this local adjustment method is simpler and faster, reducing downtime for mold changes and significantly improving production efficiency. Furthermore, replacing the upper mold only requires re-positioning the top mold according to the adjusted position, further simplifying the operation.

[0016] 3. The lifting mechanism set at the bottom of the lower mold can provide stable and reliable auxiliary demoulding force for the casting, effectively overcome the adhesion between the casting and the mold cavity and the tightening force of the molding sand, reduce the tensile stress on the casting during demoulding, and reduce the risk of defects such as cracks and deformation in the casting. At the same time, it also helps to protect the accuracy of the mold cavity, improve the casting yield and mold service life.

[0017] 4. When the hydraulic push rod drives the assembly plate to move, the support frame can expand or contract accordingly and automatically adjust the support position to the center area of ​​the assembly plate, providing central support force for the assembly plate, enhancing its stability under stress, preventing tilting or shaking, and optimizing force transmission through the lever principle, making the support more stable and reliable, able to adapt to larger working loads, and ensuring the safety and stability of the entire mold device during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the mold of the present invention; Figure 2 For the present invention Figure 1 Main view; Figure 3 This is a structural diagram of the first embodiment of the lower mold of the present invention; Figure 4 This is a structural diagram of a second embodiment of the lower mold of the present invention; Figure 5 For the present invention Figure 4 A in the middle is an enlarged structural diagram; Figure 6 This is a schematic diagram of the assembly structure of the top mold, compound mold and bottom mold of the present invention; Figure 7 This is a schematic structural diagram of the jacking mechanism of the present invention; Figure 8 This is a front view of the jacking mechanism of the present invention; Figure 9 This is a top view of the jacking mechanism of the present invention; Figure 10 This is a schematic structural diagram of the jacking mechanism of the present invention under normal conditions; Figure 11 This is a schematic diagram of the structure of the hydraulic push rod after pushing; Figure 12 It is a schematic diagram of the internal air cavity structure of the push rod of the present invention.

[0019] Explanation of reference numerals in the figures: 1. upper mold; 2. lower mold; 201. top mold; 202. compound mold; 203. bottom mold; 204. ejection hole; 205. wing ear; 206. screw; 207. nut; 208. upper step opening; 209. lower step opening; 210. compound step opening; 3. top cap; 4. ejector rod; 5. base cylinder; 6. air supply pipe; 7. drive motor; 8. assembly plate; 9. side support plate; 10. support frame; 11 , slide; 12. Slider; 13. Limit plate; 14. Bottom trough box; 15. Hydraulic push rod; 16. Air nozzle; 17. Air cavity; 171. Branch cavity; 172. Gap cavity; 173. First compression cavity; 174. Second compression cavity; 175. Third compression cavity; 176. Air inlet; 18. Piston disc; 19. Lifting rod; 20. Roller; 21. Cam; 22. Inflating cavity; 23. Closing plate; 24. Lower cavity; 25. Solenoid valve. DETAILED DESCRIPTION

[0020] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0021] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. As long as the effects of the present invention can be exerted, various changes can be made to the embodiments.

[0022] By those skilled in the art, the components in this case are connected in sequence. The specific connection and operation sequence should refer to the following working principle. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process.

[0023] like Figure 1 As shown, the embodiment of the present application proposes an adaptive adjustment mold device for wind power gearbox casting, which includes an upper mold 1 and a lower mold 2, wherein the upper mold 1 can be buckled on the lower mold 2 to form a complete mold cavity to accommodate molding sand and form the gearbox casting; in addition, as shown Figure 2 As shown, a lifting mechanism is provided at the bottom of the lower mold 2, which provides an auxiliary demoulding function. In particular, after the casting is cooled and solidified, the lifting mechanism can apply a lifting force to the casting from below to overcome the adhesion between the casting and the mold cavity and the clamping force of the molding sand, thereby significantly reducing the difficulty of demoulding and improving the degree of automation of the demoulding process and the casting yield rate.

[0024] In this embodiment, if Figure 1 and Figure 2 As shown, the lower mold 2 is composed of multiple independently separable and stackable modular components, including a top mold 201, multiple compound molds 202 and a bottom mold 203; the top mold 201 is located at the top of the stacking structure, the bottom mold 203 is located at the bottom, and the multiple compound molds 202 are placed between the top mold 201 and the bottom mold 203 as needed; in order to ensure that these modules can be firmly combined into a whole, the outer walls of the top mold 201 and the bottom mold 203 are circumferentially provided with multiple wing ears 205, and the wing ears 205 on the outer walls of the top mold 201 and the bottom mold 203 are fixed into one by a fixing assembly, clamping and fixing the multiple compound molds 202 between the top mold 201 and the bottom mold 203.

[0025] It should be noted that the lower mold 2 adopts a modular and stackable design, which can adapt to the casting needs of various types and sizes of wind power gearboxes, and realizes adaptive adjustment of the mold device; the lower mold 2 has at least two components to cast various types of gearboxes; for example: when casting conventional type gearboxes, the top mold 201 and the bottom mold 203 can be used; when replacing the mold, the bottom mold 203 of the lower mold 2 does not need to be replaced, and the number of compound molds 202 can be added according to demand to adjust the use height of the lower mold 2.

[0026] For example, Figure 3 As shown, in the first embodiment of the lower mold 2, the top mold 201 and the bottom mold 203 are fixed by a fixing assembly. In this case, it is only necessary to firmly fix the top mold 201 and the bottom mold 203 together through the fixing assembly to form a relatively fixed, standard height lower mold assembly, which can be put into production use.

[0027] For example, Figure 4 As shown, in the second embodiment of the lower mold 2, this embodiment is aimed at the scenario where a larger gearbox needs to be cast; first, the original top mold 201 can be removed, and then the corresponding number of compound molds 202 can be stacked and added on the bottom mold 203 according to the required increased height; by adjusting the number of compound molds 202, after accurately reaching the target height, the top mold 201 can be reinstalled; it is worth noting that the replacement or adjustment of the upper mold 1 also needs to match the position of the reassembled top mold 201 to ensure that the cavities of the upper and lower molds can be accurately aligned; the core advantage of adopting the setting method described above is that when the mold is replaced to adapt to different models of products, the bottom mold 203 of the lower mold 2 can remain stationary, and its positional relationship relative to the upper mold 1 or other reference surfaces remains unchanged; this ensures that after the mold is replaced, the reference values ​​of the entire mold system (such as the relative coordinates of the cavity, key dimensions, etc.) remain stable, avoiding positioning errors that may be introduced by replacing the bottom mold, thereby greatly reducing the complex operations and labor during the replacement process, making the mold replacement process more convenient, efficient and reliable.

[0028] In some embodiments, as Figure 6 As shown, the fixing assembly includes a screw 206, which passes through the wing ears 205 on the outer walls of the top mold 201 and the bottom mold 203. A plurality of nuts 207 are threaded on the screw 206, and every two nuts 207 are clamped at the upper and lower ends of each wing ear 205; screws 206 of different lengths and models are used according to the different numbers of stacked composite molds 202. When in use, the screw 206 passes through the wing ears 205 on the outer walls of the top mold 201 and the bottom mold 203, and is fastened by the nuts 207, which is convenient and quick to operate.

[0029] like Figure 5As shown, in this embodiment, in order to enhance the stability of the lower mold 2 of the multi-layer structure after assembly and prevent dislocation or deformation under the action of casting pressure or high temperature, an upper step opening 208 is circumferentially provided at the bottom end of the top mold 201 in this embodiment, and a lower step opening 209 is circumferentially provided at the top end of the bottom mold 203, and the upper step opening 208 is adapted to the lower step opening 209; when the top mold 201 is placed on the bottom mold 203 (or when the composite molds 202 are stacked on each other), the upper step opening 208 can be accurately embedded in the lower step opening 209 The staggered stepped opening setting can effectively prevent the appearance of obvious gaps between the top mold 201 and the bottom mold 203 (or adjacent compound molds), thereby avoiding the problem of molding sand leakage (sand leakage) that may occur during the pouring process and ensuring the sealing of the mold cavity; secondly, this stepped nested design enables the two modules to press against each other at the contact surface to form multi-point or surface contact, which significantly enhances the connection strength between them and the rigidity of the overall structure, so that the multi-layer structure of the lower mold 2 can remain stable when subjected to various loads during the casting process.

[0030] Furthermore, in order to ensure that each composite mold 202 can maintain good connection stability and overall strength with the top mold 201 and the bottom mold 203 (and adjacent composite molds) after assembly, the present embodiment also makes corresponding designs for the structure of the composite mold 202; specifically, composite stepped openings 210 are provided in the top circumferential direction and the bottom circumferential direction of each composite mold 202; the structure and size of the composite stepped openings 210 can respectively match the upper stepped opening 208 on the top mold 201 and the lower stepped opening 209 on the bottom mold 203 (or The compound step openings 210 on adjacent compound molds are adapted; the compound mold 202 can be adapted to the upper step openings 208 and the lower step openings 209 after being assembled, ensuring that the compound mold 202 can be accurately docked and firmly pressed against the top mold 201, the bottom mold 203 and the adjacent compound molds 202 through the step openings after installation, thereby greatly improving the connection stability of the compound mold 202 after installation, and ensuring that even after multiple compound molds 202 are installed, the entire lower mold 2 can still maintain a high overall usage strength and structural reliability.

[0031] In this embodiment, if Figure 2 As shown, an ejection hole 204 is opened at the bottom of the bottom mold 203, and the output end of the jacking mechanism is located at the ejection hole 204, which assists the gear box in demoulding.

[0032] For example, Figure 7As shown, the lifting mechanism includes an assembly plate 8, a propulsion assembly, a lifting rod assembly and a top cap 3; the propulsion assembly is arranged below the assembly plate 8, the lifting rod assembly is arranged on the assembly plate 8, and the top cap 3 is arranged on the lifting rod assembly and is located in the ejection hole 204; during implementation, the propulsion assembly pushes and pulls the assembly plate 8 up and down, driving the lifting rod assembly to move in the ejection hole 204 to repeatedly lift the molded gear box to assist it in demolding.

[0033] In this embodiment, if Figure 7-10 As shown, the lifting rod assembly includes a base tube 5, a push rod 4, an air nozzle 16, an air cavity 17 and an air supply pipe 6; specifically, the base tube 5 is fixedly connected to the assembly plate 8, the push rod 4 is inserted into the base tube 5, the top end passes through the base tube 5, and the top cap 3 is arranged at the top end of the push rod 4; the air nozzle 16 is arranged circumferentially at the top of the push rod 4, and the air outlet is arranged toward the ejection hole 204; the air cavity 17 is formed in the push rod 4 and is connected to the air nozzle 16; the air supply pipe 6 is connected to the base tube 5, and an electromagnetic valve 25 is provided on the air supply pipe 6.

[0034] During implementation, the propulsion component pushes and pulls the assembly plate 8 upward, driving the ejector rod 4 and the top cap 3 to move in the ejection hole 204 to lift the molded gear box. At this time, the air supply pipe 6 injects high-pressure gas into the base tube 5, and the high-pressure gas is ejected through the air cavity 17 through the air nozzle 16. The ejected gas acts on the ejection hole 204 and enters the lower mold 2. As the top cap 3 lifts the molded gear box, a gap is formed between the molded gear box and the sand body, and the high-pressure gas is sprayed into the gap to assist the molded gear box in demolding.

[0035] Furthermore, the lifting rod assembly also includes a sealing plate 23, a piston disc 18, a lifting rod 19, a roller 20, a cam 21 and a drive motor 7; wherein, the sealing plate 23 is arranged in the base cylinder 5, dividing the inner cavity of the base cylinder 5 into an inflation chamber 22 and a lower chamber 24, and the push rod 4 is located in the inflation chamber 22; the piston disc 18 is fixed to the bottom of the push rod 4, and a sealing ring is arranged circumferentially to prevent high-pressure gas from leaking into the lower chamber 24; the lifting rod 19 is arranged at the bottom of the piston disc 18, and the bottom end of the lifting rod 19 passes through the sealing plate 23 and is inserted into the lower chamber 24; the roller 20 is rotatably connected to the bottom of the lifting rod 19; the cam 21 is rotatably connected to the lower chamber 24, and the outer wall surface conflicts with the roller 20; the drive motor 7 is fixed on the base cylinder 5, and the output end is connected to the cam 21.

[0036] In some embodiments, the driving motor 7 drives the cam 21 to rotate continuously. When the cam 21 rotates, it drives the lifting rod 19 to rise and fall continuously through cooperation with the roller 20, so that the push rod 4 and the top cap 3 are continuously raised and lowered, and move up and down in a small space, so that the molded gear box is continuously moved to form a vibration effect when it is demolded, so that the sand on the surface of the gear box is shed to the greatest extent, and the size of the gap between the gear box and the sand body is continuously adjusted, so that the high-pressure airflow is continuously adjusted in the blowing gap, thereby improving the demolding effect of the gear box.

[0037] In this embodiment, if Figure 12 As shown, the air cavity 17 includes a central cavity, an air inlet 176, a gap cavity 172 and a plurality of branch air cavities 171; wherein, the central cavity is opened at the center of the inner part of the push rod 4, and includes a first compression cavity 173, a second compression cavity 174 and a third compression cavity 175 whose diameters decrease in a step-like manner from bottom to top; the air inlet 176 is opened on the outer wall of the push rod 4 and communicates with the central cavity; the gap cavity 172 is opened above the central cavity; the top ends of the plurality of branch air cavities 171 are communicated with each air nozzle 16, and the bottom ends are communicated with the gap cavity 172.

[0038] During implementation, the high-pressure gas entering the inflation chamber 22 from the air supply pipe 6 enters the central cavity through the air inlet 176. After being compressed by the first compression chamber 173, the second compression chamber 174 and the third compression chamber 175 with gradually decreasing diameters, the high-pressure gas is distributed by the gap cavity 172 and ejected by multiple jet nozzles 16, thereby increasing the airflow ejection intensity.

[0039] In addition, if Figure 11 As shown, the propulsion assembly in this embodiment includes a bottom trough box 14, a hydraulic push rod 15, two side support plates 9 and a support frame 10; wherein, the bottom trough box 14 is set on a fixed object, the hydraulic push rod 15 is fixed in the bottom trough box 14, and the output end is fixed to the assembly plate 8; the two side support plates 9 are slidably connected to both sides of the assembly plate 8; the support frame 10 is hingedly set between the assembly plate 8 and the two side support plates 9.

[0040] Furthermore, limit plates 13 are provided on both sides of the assembly plate 8 ; a slide groove 11 is provided on the outer wall of the assembly plate 8 , and a slider 12 slidable in the slide groove 11 is provided on the inner wall of the side support plate 9 .

[0041] When the hydraulic push rod 15 is pushed forward, the support frame 10 is driven to expand by the rising assembly plate 8, driving the two side support plates 9 to retract inward on the assembly plate 8, so that the support position of the support frame 10 is retracted and supported at the center of the assembly plate 8, thereby improving the support stability of the support frame 10 on the assembly plate 8.

[0042] The specific working principle is as follows: The lower mold 2 adopts a stacked modular structure consisting of a top mold 201, a compound mold 202, and a bottom mold 203. The height can be adjusted by increasing or decreasing the number of compound molds 202 to meet the casting requirements of different types of gearboxes. The specific process is as follows: The upper step opening 208 at the bottom of the top mold 201, the compound step openings 210 at both ends of the compound mold 202, and the lower step opening 209 at the top of the bottom mold 203 are adapted to each other, forming a nested structure when stacked, ensuring that the modules are sealed and without misalignment; The wing ears 205 on the outer walls of the top mold 201 and the bottom mold 203 are penetrated by the screw rod 206, and the wing ears 205 are clamped by the nut 207 to achieve fastening, and the compound mold 202 is clamped and fixed in the middle; when the mold height needs to be adjusted, it is only necessary to loosen the nut 207, increase or decrease the number of compound molds 202, and then re-tighten it. There is no need to replace the bottom mold 203, which greatly shortens the mold change time; the same set of molds can match the wind power gearbox cavity requirements of different height specifications by adjusting the number of compound molds 202, thereby improving the versatility of the mold and reducing customization costs.

[0043] The demoulding working principle of the lifting mechanism: The lifting mechanism is located at the bottom of the lower mold 2 and acts on the casting through the ejection hole 204 to achieve efficient demoulding. Its core includes the coordinated operation of the propulsion assembly and the lifting rod assembly; Support and lifting drive of the propulsion assembly: When the hydraulic push rod 15 is extended and retracted, it drives the assembly plate 8 to rise and fall, driving the entire lifting rod assembly to move synchronously; at the same time, the side support plate 9 slides in the slide groove 11 of the assembly plate through the slider 12, and the support frame 10 (hinged between the assembly plate 8 and the side support plate 9) automatically expands or contracts as the assembly plate 8 rises and falls, adjusting the support position to the center area of ​​the assembly plate 8, and enhancing the force stability through the lever principle to prevent tilting during the lifting process.

[0044] The composite demoulding power of the ejector rod assembly: the drive motor 7 rotates the cam 21 in the lower chamber 24. The cam pushes the ejector rod 19 up and down through the roller 20, which in turn drives the ejector rod 4 and the top cap 3 to vibrate at a high frequency and small amplitude (achieved by the reciprocating motion of the piston plate 18 in the inflation chamber 22). This vibration loosens the connection between the casting and the molding sand, reducing adhesion. Pneumatically assisted demoulding: the air supply pipe 6 inflates the base tube 5 through the solenoid valve 25. The gas is compressed by the air cavity 17 in the ejector pin and then ejected from the air nozzle 16 (the air cavity 17 includes a first compression cavity 173, a second compression cavity 174 and a third compression cavity 175 with stepped diameters to enhance the airflow pressure). The ejected gas enters the gap between the casting and the cavity along the ejection hole 204, forming an air film, reducing friction resistance, and cooperating with the mechanical thrust of the top cap 3 to achieve efficient demoulding.

[0045] In the description of the present invention, each embodiment focuses on the differences from other embodiments, and reference can be made to the same or similar parts between the embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the methods. While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A self-adaptive mold device for casting a wind turbine gearbox, comprising an upper mold (1) and a lower mold (2), wherein the upper mold (1) can be fastened to the lower mold (2), and is characterized in that: The lower mold (2) comprises a stackable top mold (201), a plurality of composite molds (202) and a bottom mold (203); the outer walls of the top mold (201) and the bottom mold (203) are provided with a plurality of wing ears (205) in the circumferential direction; the wing ears (205) on the outer walls of the top mold (201) and the bottom mold (203) are fixed together by a fixing assembly, and the plurality of composite molds (202) are clamped and fixed between the top mold (201) and the bottom mold (203); An ejection hole (204) is provided at the bottom of the bottom mold (203), and a lifting mechanism is provided at the bottom of the lower mold (2), with the output end of the lifting mechanism being located at the ejection hole (204).

2. The self-adaptive adjustment mold device for casting a wind turbine gearbox according to claim 1, characterized in that: The fixing assembly comprises a screw (206) which passes through the wing ears (205) on the outer walls of the top mold (201) and the bottom mold (203). A plurality of nuts (207) are screwed onto the screw (206), and every two of the nuts (207) are clamped at the upper and lower ends of each wing ear (205).

3. The self-adaptive adjustment mold device for casting a wind turbine gearbox according to claim 1, characterized in that: An upper stepped opening (208) is circumferentially provided at the bottom end of the top die (201), and a lower stepped opening (209) is circumferentially provided at the top end of the bottom die (203), wherein the upper stepped opening (208) is adapted to the lower stepped opening (209).

4. The self-adaptive adjustment mold device for casting a wind turbine gearbox according to claim 3, characterized in that: Each compounding mold (202) is provided with compounding stepped openings (210) in the circumferential direction at the top and bottom ends thereof, and the compounding stepped openings (210) are respectively adapted to the upper stepped opening (208) and the lower stepped opening (209).

5. The self-adaptive adjustment mold device for casting a wind turbine gearbox according to claim 1, characterized in that: The jacking mechanism comprises: Assembly plate (8); A propulsion assembly is provided below the assembly plate (8) and pushes and pulls the assembly plate (8) up and down; A lifting rod assembly is arranged on the assembly plate (8); A top cap (3) is provided on the jacking rod assembly and is located in the ejection hole (204).

6. The self-adaptive adjustment mold device for casting a wind turbine gearbox according to claim 5, characterized in that: The jacking rod assembly includes: A base cylinder (5) is fixedly connected to the assembly plate (8); A top rod (4) is inserted into the base tube (5), with its top end passing through the base tube (5), and the top cap (3) is arranged on the top end of the top rod (4); An air jet nozzle (16) is arranged on the circumference of the top of the ejector rod (4), with the air outlet facing the ejection hole (204); An air cavity (17) is formed in the push rod (4) and is in communication with the air nozzle (16); An air supply pipe (6) is connected to the base cylinder (5), and a solenoid valve (25) is provided on the air supply pipe (6).

7. The self-adaptive adjustment mold device for casting a wind turbine gearbox according to claim 6, characterized in that: The jacking rod assembly also includes: A sealing plate (23) is arranged in the base cylinder (5) to divide the inner cavity of the base cylinder (5) into an inflation cavity (22) and a lower cavity (24), and the ejector rod (4) is located in the inflation cavity (22); A piston disc (18) is fixed to the bottom of the push rod (4) and is provided with a sealing ring in the circumferential direction; A lifting rod (19) is arranged at the bottom of the piston disc (18), and the bottom end of the lifting rod (19) passes through the sealing plate (23) and is inserted into the lower cavity (24); A roller (20) rotatably connected to the bottom of the lifting rod (19); A cam (21) is rotatably connected in the lower chamber (24), with its outer wall surface in contact with the roller (20); A driving motor (7) is fixed on the base cylinder (5), and an output end thereof is connected to the cam (21).

8. The self-adaptive adjustment mold device for casting a wind turbine gearbox according to claim 6, characterized in that: The air cavity (17) comprises: A central cavity is provided at the center of the top rod (4), and includes a first compression cavity (173), a second compression cavity (174), and a third compression cavity (175), the diameters of which decrease in a step-like manner from bottom to top; An air inlet (176) is provided on the outer wall of the ejector rod (4) and communicates with the central cavity; a gap cavity (172) formed above the central cavity; A plurality of air cavities (171) are provided, the top of which is communicated with each air jet nozzle (16), and the bottom of which is communicated with the gap cavity (172).

9. The self-adaptive adjustment mold device for casting a wind turbine gearbox according to claim 5, characterized in that: The propulsion assembly comprises: A bottom tank box (14) is arranged on a fixed object; A hydraulic push rod (15) is fixed in the bottom tank (14), and an output end is fixed to the assembly plate (8); Two side support plates (9) slidably connected to both sides of the assembly plate (8); The support frame (10) is hingedly arranged between the assembly plate (8) and the two side support plates (9).

10. The self-adaptive adjustment mold device for casting a wind turbine gearbox according to claim 9, characterized in that: Limiting plates (13) are provided on both sides of the assembly plate (8); a sliding groove (11) is provided on the outer wall of the assembly plate (8); and a sliding block (12) that can slide in the sliding groove (11) is provided on the inner wall of the side support plate (9).

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