CN221935297U - Pouring system device for iron mold sand-coated resin sand composite casting mold of wind power main shaft - Google Patents

Abstract

The utility model relates to a pouring system device for an iron mold sand-coated resin sand composite casting mold of a wind power main shaft, and belongs to the technical field of casting wind power generation. The device comprises a pouring cup, a straight pouring gate, a plurality of rain-type ingates, a plurality of foam ceramic filter screens, a plurality of groups of transition filter pouring gates, a plurality of dispersed transverse pouring gates and a plurality of molten iron filter devices, wherein the bottom of the pouring cup is connected with the top of the straight pouring gate; the plurality of distributed cross runners are matched with the plurality of groups of transition filtering runners, and each group of transition filtering runners is provided with two foam ceramic filter screens. The utility model has reasonable structural design, realizes riser-free casting and as-cast casting production of the wind power main shaft casting, greatly improves the casting process yield of the wind power main shaft casting production, and meets the use requirement.

Description

Pouring system device for iron mold sand-coated resin sand composite casting mold of wind power main shaft

Technical Field

The utility model relates to a device, in particular to a pouring system device for a sand-coated iron mold and resin sand composite casting mold of a wind power main shaft, which is applied to casting of the sand-coated iron mold and resin sand composite casting mold of the wind power main shaft of a wind power generator and belongs to the technical field of casting wind power generation.

Background

Wind power generation is taken as a new energy technology with green and sustainable development, has been advanced and developed in twenty-first century, and the capacities of a single machine and a general assembly machine are continuously refreshed, so that the application of various new materials, new processes and new technologies accelerates the update speed of the wind power generation technology, and greatly reduces the manufacturing cost of the wind power generation complete machine.

For a large-sized wind generating set, how to improve the material performance of each part of the wind generating set and realize the light weight of each part is one of important means for better playing the generating efficiency of the wind generating set and reducing the manufacturing cost of the wind generating set. The main shaft of the wind driven generator (hereinafter referred to as wind power main shaft) as an important stress part of the wind driven generator adopts ductile cast iron casting production to gradually replace the original forged steel part production, and the casting production form of the ductile cast iron wind power main shaft mainly comprises resin sand casting and metal mold casting. The two casting production modes cast large-scale wind power main shaft castings (the weight of a single piece is generally 15-25 tons), and have some technical defects. For example: the casting has the defects of incompact internal structure, lower comprehensive mechanical property, complex production process, low production efficiency, higher production cost, strict control requirement of the production process and the like, and the defects restrict the further application of the nodular cast iron wind power main shaft, in particular the application in severe environment and on a high-power wind generating set.

The iron mold sand-coated casting technology is a novel technology for energy-saving, material-saving, high-efficiency and high-quality casting, and for castings with inner cavities with certain shapes in the wind power main shaft, the iron mold sand-coated and resin sand composite casting technology can well overcome the defects, so that the comprehensive mechanical properties of nodular cast iron materials are better improved, and the cast wind power main shaft has excellent extensibility and low-temperature impact property.

Therefore, aiming at the characteristics of the iron mold sand-coated and resin sand composite casting process, a casting system meeting the iron mold sand-coated and resin sand composite casting process is developed, and is a key link for producing qualified wind power main shaft castings by adopting the iron mold sand-coated and resin sand composite casting process.

Disclosure of utility model

The utility model aims to overcome the defects in the prior art, and provides the pouring system device for the iron mold sand-coated resin sand composite casting mold of the wind power main shaft, which has the advantages of reasonable structural design, safety, reliability, energy conservation and environmental protection, realizes riser-free casting and as-cast casting production of the wind power main shaft casting, and greatly improves the casting process yield of the wind power main shaft casting production.

The utility model solves the problems by adopting the following technical scheme: this pouring system device for iron mould sand-lined, resin sand composite casting mould of wind-powered electricity generation main shaft, including pouring basin, sprue, many dispersion type cross runners and a plurality of molten iron filter equipment, the sprue top is connected to pouring basin bottom, and this sprue bottom sets up many dispersion type cross runners, its characterized in that: the device comprises a wind power main shaft flange, a plurality of spray type inner runners, a plurality of foam ceramic filter screens and a plurality of groups of transition filter runners, wherein the tail ends of the plurality of dispersed type inner runners are communicated with the upper channels of a molten iron filter device by adopting bottom pouring, the molten iron filter device is provided with a plurality of foam ceramic filter screens, and the lower channels of the plurality of foam ceramic filter screens are respectively connected with the plurality of spray type inner runners entering the bottom of the wind power main shaft flange; the plurality of molten iron filtering devices connected with the distributed runner are distributed uniformly on the periphery of the outer diameter of the bottom of the wind power main shaft flange; the molten iron filtering device is provided with a plurality of groups of transition filtering pouring channels, and a plurality of distributed transverse pouring channels are matched with the plurality of groups of transition filtering pouring channels.

Preferably, each group of transition filter pouring channels is provided with two foam ceramic filter screens.

Preferably, the distance between the molten iron filtering device and the outer diameter of the wind power main shaft flange is 250-350mm.

Preferably, the utility model further comprises an annular floating slag gathering ring, wherein the annular floating slag gathering ring is arranged at the top of the wind power main shaft casting mold; the method is used for floating and gathering gas and impurities generated in the wind power main shaft casting mould, so that the internal quality of the wind power main shaft casting main body is ensured.

Preferably, the annular floating slag gathering ring is arranged in a self-hardening resin sand upper box casting mold of the wind power main shaft, the inner diameter and the outer diameter of the annular floating slag gathering ring are consistent with the inner diameter and the outer diameter of the top of the wind power main shaft, and the height is 30-70mm.

Preferably, the utility model also comprises a plurality of exhaust channels for discharging the gas of the sand coating layer, and the top of the wind power main shaft casting mould is provided with a plurality of exhaust channels which are communicated with the atmosphere; the channel is used for discharging a large amount of gas generated by heating a sand coating layer of the iron mold sand coating casting mold into the atmosphere in the molten iron casting process, so that the generation of air hole defects in the wind power main shaft casting is prevented.

Preferably, the exhaust passage adopts a blank holder cylinder shape, and the diameter of the exhaust passage is 60-90mm.

Preferably, the pouring system of the utility model is an open pouring system, and the proportion of each section is as follows: SIGMA _{Straight line} :∑ _{Transverse bar} :∑ _{Inner part} =1:1.5-1.8:3.8-4.6.

Compared with the prior art, the utility model has the following advantages and effects: 1) The integral structure is reasonable in design, safe and reliable, meets the requirements of iron mold sand-lined and self-hardening resin sand composite casting technology of the wind power main shaft and balanced solidification of molten iron, realizes riser-free casting of the wind power main shaft casting by combining graphitization self-feeding action in the iron mold sand-lined casting technology, and greatly improves the casting process yield of wind power main shaft casting production; 2) The bottom pouring rain pouring type pouring is adopted, so that molten iron flows in a balanced manner and does not splash, and casting defects of iron beans, air entrainment forming air holes, slag inclusion and the like generated in the pouring process are greatly reduced; 3) By combining a foam ceramic filtering technology, the defect of primary slag of internal tissues of castings is avoided; 4) The top is communicated with an atmosphere air outlet device to ensure the smooth discharge of the air generated by the sand-coated iron mold sand-coated layer in the casting process; 5) The slag collecting ring at the top of the wind power casting mould floats up and collects secondary slag generated in the pouring process, so that the casting body has no casting defects such as slag inclusion and the like; 6) The riser-free and as-cast casting production of the wind power main shaft casting is realized, and the energy-saving effect is remarkable.

Drawings

FIG. 1 is a schematic view of a wind power spindle in accordance with an embodiment of the present utility model.

Fig. 2 is a schematic diagram of an iron mold sand-coated and self-hardening resin sand composite casting device of a main shaft of a wind driven generator according to an embodiment of the utility model.

Fig. 3 is a schematic structural diagram of a pouring system device for casting a wind power main shaft composite casting mold according to an embodiment of the utility model.

Fig. 4 is a schematic diagram of a pouring system device for casting a wind power main shaft composite casting mold according to the second embodiment of the utility model.

FIG. 5 is a schematic diagram of a mold closing device for casting a composite sand mold of iron mold coated sand and self-hardening resin sand of a wind power main shaft with a pouring system device according to the embodiment of the utility model.

Fig. 6 is a schematic diagram of an iron mold sand-lined self-hardening resin sand composite casting pouring system device of a wind power main shaft in a molten iron mold filling process (before molten iron pouring).

Fig. 7 is a schematic diagram of an iron mold sand-lined self-hardening resin sand composite casting pouring system device of a wind power spindle in a molten iron mold filling process (molten iron is filled in a sprue and a part of a runner).

Fig. 8 is a schematic diagram of an iron mold sand-lined self-hardening resin sand composite casting pouring system device of a wind power main shaft in a molten iron filling process (upper part of a molten iron filling and filtering device).

Fig. 9 is a schematic diagram of an iron mold sand-lined self-hardening resin sand composite casting pouring system device of a wind power spindle in the process of molten iron filling (molten iron enters a meat runner through a filtering device and enters a spindle casting cavity).

Fig. 10 is a schematic diagram of an iron mold sand-lined self-hardening resin sand composite casting pouring system device of a wind power main shaft in the molten iron filling process (molten iron fills a main shaft casting cavity).

Fig. 11 is a schematic diagram of an iron mold sand-lined self-hardening resin sand composite casting pouring system device of a wind power main shaft in a molten iron mold filling process (molten iron enters an exhaust channel).

Fig. 12 is a schematic diagram of an iron mold sand-lined self-hardening resin sand composite casting pouring system device of a wind power main shaft in a molten iron mold filling process (molten iron pouring is completed).

In the figure: the device comprises a pouring cup 1, a straight pouring gate 2, a distributed transverse pouring gate 3, a transitional filtering pouring gate 4, a foam ceramic filter screen 5, a rain-type inner pouring gate 6, an annular floating slag gathering ring 7, an exhaust channel 8 and a molten iron filtering device 9; the casting mold comprises an iron mold sand-coated casting mold T, a self-hardening resin sand casting mold Z, a self-hardening resin sand upper box casting mold Z1, a self-hardening resin sand bottom box casting mold Z2, a wind power main shaft casting part F, an iron mold transition filtering pouring gate cavity T1, a wind power main shaft casting mold cavity F1, a filtering pouring gate casting mold cavity T2 and a pouring system L.

Detailed Description

The present utility model will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present utility model and not limited to the following examples.

Examples

Referring to fig. 1 to 12, the pouring system device for the iron mold sand-covering and resin sand composite casting mold of the wind power spindle of the embodiment comprises a pouring cup 1, a straight pouring gate 2, an annular floating slag collecting ring 7, a plurality of rain-type inner pouring gates 6, a plurality of foam ceramic filter screens 5, a plurality of groups of transition filter pouring gates 4, a plurality of exhaust channels 8 for discharging sand-covering layer gas, a plurality of dispersed transverse pouring gates 3 and a plurality of molten iron filter devices 9 matched with the pouring system L, wherein the bottom of the pouring cup 1 is connected with the top of the straight pouring gate 2, the bottom of the straight pouring gate 2 is provided with a plurality of dispersed transverse pouring gates 3, the tail ends of the dispersed transverse pouring gates 3 are communicated with the upper channels of the molten iron filter devices 9 by adopting bottom pouring, the molten iron filter devices 9 are provided with a plurality of foam ceramic filter screens 5, and the lower channels of the foam ceramic filter screens 5 are respectively connected with the rain-type inner pouring gates 6 entering the bottom of the wind power spindle flange; a plurality of molten iron filtering devices 9 connected with the distributed runner 3 are uniformly distributed on the periphery of the outer diameter of the bottom of the wind power main shaft flange; the molten iron filtering device 9 is provided with a plurality of groups of transition filtering pouring channels 4, a plurality of dispersed transverse pouring channels 3 are matched with the plurality of groups of transition filtering pouring channels 4, and each group of transition filtering pouring channels 4 is provided with two foam ceramic filter screens 5; the annular floating slag gathering ring 7 is arranged at the top of the wind power main shaft casting mould, and a plurality of exhaust channels 8 leading to the atmosphere are arranged at the top of the wind power main shaft casting mould.

The iron mold sand-coated and self-hardening resin sand composite casting mold for casting the wind power main shaft comprises the following steps: the outer side surface of the wind power main shaft adopts an iron mold sand-coated casting mold T, the bottom surface, the upper plane and the inner cavity of the wind power main shaft adopt a self-hardening resin sand casting mold Z (see figure 2), and the casting has the advantages of metal mold and sand mold casting. According to the structural characteristics and the technological requirements of the iron mold sand-coated and self-hardening resin sand composite casting mold (shown in figure 2) for casting the wind power main shaft and the performance requirements of the wind power main shaft, a pouring system device of the composite casting mold is formed by adopting a straight pouring gate bottom dispersed water inlet structure, a molten iron block type filtering device, a bottom pouring rain type inner pouring gate structure, a top annular scum slag collecting device, an air exhaust device on the top of a sand coating layer and the like, and is shown in figures 3-4.

The technological principle of the pouring system device for the iron mold sand-coated resin sand composite casting mold of the wind power main shaft in the embodiment is as follows: the weight of the wind power main shaft is generally about 15-25 tons, the height of the main shaft is about 3-5 meters, and the diameter is about 2-4 meters, and the wind power main shaft belongs to large castings. In the casting pouring, solidifying and cooling process of the wind power main shaft, the method has the characteristics of long filling time of molten iron pouring into a casting mold cavity, long solidifying process time of molten iron in the cavity after the casting mold is filled with the molten iron and the like. For the wind power main shaft for iron mold sand-covering and self-hardening resin sand composite casting, the wind power main shaft casting pouring system of the embodiment ensures that the molten iron rises into the casting mould to flow stably without turbulence by fully filtering the original molten iron before entering the casting mould, enabling the molten iron to enter the casting mould in an open manner, enabling the temperature of the circular section of the wind power main shaft casting to be relatively balanced by a plurality of rain-type inner pouring gates 6, gathering and collecting impurities such as slag inclusion and the like generated in the process of filling the main shaft casting by the molten iron, timely discharging gas generated by an iron mold sand-covering layer in the casting process from the casting mould cavity and the like, and finally casting the wind power main shaft casting F without defects and main performance by combining the advantages of the iron mold sand-covering and self-hardening resin sand casting mould Z. The casting system adopted in the wind power main shaft iron mold sand-coated and self-hardening resin sand composite casting process also adopts an iron mold sand-coated and self-hardening resin sand composite manufacturing mode, namely: the casting system casting mould is respectively molded in a self-hardening resin sand casting mould Z and an iron mould sand-covering casting mould T according to the structure and arrangement requirements of the casting system, and a complete iron mould sand-covering and self-hardening resin sand casting system device is formed after the mould is closed, so that the functions of casting, blocking slag, gathering slag, self-feeding, exhausting and the like of molten iron required by the wind power main shaft casting mould are completed.

The pouring system device for the iron mold sand-coated resin sand composite casting mold of the wind power main shaft is an open pouring system, and the proportion of each section is as follows: sigma _{Straight line} :∑ _{Transverse bar} :∑ _{Inner part} =1:1.5-1.8:3.8-4.6, ensuring that molten iron smoothly enters the casting mould in the casting process.

See fig. 3-4: according to the weight of the wind power main shaft casting F, a plurality of distributed cross runners are arranged at the bottom of the straight runner; the tail end of the horizontal pouring gate enters the upper channel of the molten iron filtering device 9 matched with the horizontal pouring gate in the pouring system, so that not only is the flow stability of molten iron fully ensured, but also the filtering effect of the molten iron filtering device 9 on the molten iron can be fully exerted, the impurities filtered in the molten iron are gathered in the upper channel of the molten iron filtering device 9, and meanwhile, the structure of the molten iron filtering system arranged on a molten iron mold is greatly simplified; the lower channel of the foam ceramic filter screen in the molten iron filtering device 9 in the pouring system device can be connected with a plurality of inner runners entering the bottom of the wind power main shaft flange, so that molten iron stably enters the wind power main shaft casting mold in a floating and rain-spraying mode; all molten iron filtering devices 9 connected with the runner are uniformly distributed on the periphery of the outer diameter of the bottom of the wind power main shaft flange, and the distance between the molten iron filtering devices and the outer diameter of the wind power main shaft flange is 250-350mm, so that the molten iron filtering system can transfer heat to the bottom of the wind power main shaft flange to prevent molten iron from being excessively concentrated in a casting mould at the flange part of the bottom of the wind power main shaft in the casting process of molten iron can be furthest reduced, and the balanced solidification of the molten iron of the casting mould of the wind power main shaft is facilitated; the top of the wind power main shaft casting mold is provided with an annular floating slag gathering ring 7 which is arranged in the self-hardening resin sand upper box casting mold Z1 of the wind power main shaft, the inner diameter and the outer diameter of the slag gathering ring are consistent with those of the top of the wind power main shaft, the height is 30-70mm, and the slag gathering ring is used for floating and gathering gas and impurities generated in the wind power main shaft casting mold, so that the internal quality of the wind power main shaft casting F main body is ensured; the top of the iron mould sand-covering casting mould T is provided with a plurality of channels which are communicated with the atmosphere and are used as gas exhaust channels 8 of the sand-covering layer, the gas exhaust channels are in a shape of a blank-pressing cylinder, the diameter of each cylindrical channel is 60-90mm, and the gas exhaust channels are used for discharging a large amount of gas generated by the sand-covering layer of the iron mould sand-covering casting mould T due to heating into the atmosphere in the molten iron casting process, so that the generation of air hole defects in the wind power main shaft casting F is prevented.

The embodiment comprises a mold closing schematic diagram of an iron mold sand-coated self-hardening resin sand composite casting mold device of a casting wind power main shaft of a casting system device, and is shown in fig. 5: the casting system device for the composite casting mould for casting the wind power main shaft is respectively molded in the self-hardening resin sand and iron mold sand-coated casting mould T. The pouring cup 1, the straight pouring gate 2, the distributed transverse pouring gate 3, the bottom pouring rain pouring type inner pouring gate 6, the top annular floating slag gathering ring 7 and the plurality of sand-covered layer gas exhaust channels 8 with the top communicated with the atmosphere are all molded by a self-hardening resin sand casting mold Z; the fabricated transition filtering pouring gate 4 in the molten iron filtering device 9 is formed by adopting self-hardening tree sand or precoated sand, and then is assembled into the iron type transition filtering pouring gate cavity T1; the ceramic foam filter screen is placed in the corresponding self-hardening resin sand filtering pouring gate casting mold cavity T2. According to the size of the foam ceramic filter screen, a plurality of rain-type ingate 6 can be arranged in each group of molten iron filter devices 9; according to the weight of the wind power main shaft, a plurality of distributed transverse pouring channels are matched, the number of the distributed transverse pouring channels can be 4, 5, 6 … … and the like, and meanwhile, the transition filtering pouring channels 4 in the same number of molten iron filtering devices 9 are matched; each group of transition filtering pouring channels 4 is provided with two foam ceramic filter screens 5 for filtering poured molten iron, and slag impurities in the molten iron are prevented from entering the wind power main shaft casting cavity F1 through a pouring system. A plurality of shower runners, such as 2, 3, 4 … …, etc., can be arranged under each ceramic foam filter screen 5 as required. The rain-type ingate is uniformly distributed on the bottom surface of the wind power main shaft flange, so that molten iron can be uniformly filled upwards in each part of the wind power main shaft casting mould in the molten iron casting process. The top of the wind power main shaft casting F casting mould is an annular slag gathering ring formed by self-hardening resin sand, and the slag gathering ring floats upwards to gather impurities in the wind power main shaft casting mould. A plurality of edge pressing circular exhaust channels are uniformly distributed above the annular slag gathering ring and are used for exhausting the sand coating layer of the iron mold sand coating casting mold T.

In the production process of the electric main shaft casting F in this embodiment, in the process of pouring molten iron into the iron mold sand-covering and self-hardening resin sand composite casting mold, as shown in fig. 6-12, the poured molten iron enters the sprue 2 through the sprue cup 1 and then enters each of the dispersed cross runners 3 of the self-hardening resin sand bottom box casting mold Z2, the molten iron enters the assembled transition filter runner 4 in the molten iron filtering device 9 from bottom to top, then flows downwards through each of the assembled transition filter runners 4 and passes through the foam ceramic filter screen 5, the filtered molten iron flows to each of the bottom pouring rain-type pouring runners 6 below the foam ceramic filter screen 5, then upwards passes through the pouring gate on the bottom surface of the wind power main shaft flange of the iron mold sand-covering and self-hardening resin sand composite casting mold, enters the wind power main shaft casting mold cavity F1, and the molten iron continuously fills upwards along the casting mold until the annular floating slag gathering ring 7 at the top of the wind power main shaft casting mold is filled with the annular floating slag gathering ring 7, and the molten iron continues to fill the top to the air exhaust channel 8 of the sand layer below the foam ceramic filter screen 5. In the process of filling the wind power main shaft casting mould, the sand coating layer of the iron mould sand coating casting mould T is heated to generate a large amount of gas, and the generated gas can be continuously discharged into the environment atmosphere through the gas exhaust channel 8 which is communicated with the atmosphere and is coated with the sand coating layer at the top of the wind power main shaft composite casting mould, and meanwhile, the discharge of the gas can be accelerated through igniting above the channel, so that the air hole defect in the wind power main shaft casting F is avoided. In the pouring process and the subsequent molten iron cooling process, slag impurities caused by the reaction of the molten iron of the wind power main shaft casting mold and gas in the casting mold and turbulence float upwards and finally gather in an annular floating slag gathering ring 7 at the top of the casting mold, so that the defects of slag inclusion and inclusion in the wind power main shaft casting F are avoided; the molten iron poured into the wind power main shaft casting mould can filter out the impurities such as primary slag impurities in the molten iron through the molten iron filter 9 formed by the foam ceramic filter screen 5, so that the defects of primary slag inclusion and impurity inclusion in the wind power main shaft casting F are avoided. The bottom pouring rain pouring type inner pouring channel 6 uniformly arranged on the bottom surface of the wind power main shaft flange ensures the balanced filling of molten iron in the pouring process, ensures the balanced cooling of the whole wind power main shaft, ensures the cooling of the molten iron in the wind power main shaft casting mold to be more reasonable, fully utilizes the expansion quantity generated by precipitation of graphite balls in the solidification cooling process of the molten iron to offset the shrinkage quantity generated by cooling of the molten iron, and greatly plays the riser-free and self-feeding effects of the iron mold sand-coated casting mold T, thereby finally obtaining the wind power main shaft casting F with compact internal structure, no shrinkage cavity and no shrinkage porosity.

According to the technological characteristics and requirements of the wind power main shaft casting F iron mold sand-coated and self-hardening resin sand composite casting, a bottom pouring rain shower open type pouring molten iron and a foam ceramic filter screen 5 are adopted to filter molten iron, the modes of balanced solidification and riser-free self-feeding, floating and gathering of molten iron inclusions at the top of a casting mold and the top sand-coated laminated side exhaust are adopted, and a pouring system device for the complete wind power main shaft casting F iron mold sand-coated and self-hardening resin sand composite casting is formed through integration and innovation and is used for the production of the wind power main shaft casting F iron mold sand-coated and self-hardening resin sand composite casting.

From the above description, those skilled in the art will be able to practice.

In addition, it should be noted that the specific embodiments described in the present specification may vary from part to part, from name to name, etc., and the above description in the present specification is merely illustrative of the structure of the present utility model. All equivalent or simple changes of the structure, characteristics and principle according to the inventive concept are included in the protection scope of the present patent. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions in a similar manner without departing from the scope of the utility model as defined in the accompanying claims.

Claims (8)

1. The utility model provides a pouring system device for iron mould sand-lined, resin sand compound casting mould of wind-powered electricity generation main shaft, includes pouring basin (1), sprue (2), many dispersion type cross runners (3) and a plurality of molten iron filter equipment (9), pouring basin (1) bottom connection sprue (2) top, this sprue (2) bottom sets up many dispersion type cross runners (3), its characterized in that: the device comprises a wind power main shaft flange, a plurality of wind power main shaft flanges, a plurality of shower type internal runners (6), a plurality of foam ceramic filter screens (5) and a plurality of groups of transition filter runners (4), wherein the tail ends of the plurality of distributed type internal runners (3) are communicated with the upper channels of a molten iron filter device (9) by adopting bottom pouring, the molten iron filter device (9) is provided with the plurality of foam ceramic filter screens (5), and the lower channels of the plurality of foam ceramic filter screens (5) are respectively connected with the plurality of shower type internal runners (6) entering the bottoms of the wind power main shaft flanges; a plurality of molten iron filtering devices (9) connected with the distributed runner (3) are distributed uniformly on the periphery of the outer diameter of the bottom of the wind power main shaft flange; the molten iron filtering device (9) is provided with a plurality of groups of transition filtering pouring channels (4), and a plurality of dispersed transverse pouring channels (3) are matched with the plurality of groups of transition filtering pouring channels (4).

2. The casting system device for the iron mold sand-lined resin sand composite casting of the wind power main shaft according to claim 1, wherein the casting system device is characterized in that: and each group of transition filtering pouring channels (4) is provided with two foam ceramic filter screens (5).

3. The casting system device for the iron mold sand-lined resin sand composite casting of the wind power main shaft according to claim 1, wherein the casting system device is characterized in that: the distance between the molten iron filtering device (9) and the outer diameter of the wind power main shaft flange is 250-350mm.

4. The casting system device for the iron mold sand-lined resin sand composite casting of the wind power main shaft according to claim 1, wherein the casting system device is characterized in that: the device further comprises an annular floating slag gathering ring (7), and the annular floating slag gathering ring (7) is arranged at the top of the wind power main shaft casting mold.

5. The casting system device for the iron mold sand-lined resin sand composite casting of the wind power main shaft according to claim 4, wherein the casting system device is characterized in that: the annular floating slag gathering ring (7) is arranged in a self-hardening resin sand upper box casting mold of the wind power main shaft, the inner diameter and the outer diameter of the annular floating slag gathering ring (7) are consistent with the inner diameter and the outer diameter of the top of the wind power main shaft, and the height is 30-70mm.

6. The casting system device for the iron mold sand-lined resin sand composite casting of the wind power main shaft according to claim 1, wherein the casting system device is characterized in that: the wind power main shaft casting mold further comprises a plurality of exhaust channels (8) for discharging gas of the sand coating, and the top of the wind power main shaft casting mold is provided with a plurality of exhaust channels (8) leading to the atmosphere.

7. The casting system device for the iron mold sand-lined resin sand composite casting of the wind power main shaft according to claim 6, wherein the casting system device is characterized in that: the exhaust passage (8) adopts a blank holder cylinder shape, and the diameter of the exhaust passage (8) is 60-90mm.

8. The casting system device for the iron mold sand-lined resin sand composite casting of the wind power main shaft according to claim 1, wherein the casting system device is characterized in that: the pouring system is an open pouring system, and the proportion of each section of the pouring system is as follows: SIGMA _{Straight line} :∑ _{Transverse bar} :∑ _{Inner part} =1:1.5-1.8:3.8-4.6.