CN217370383U

CN217370383U - Casting mold structure for wind power planet carrier casting

Info

Publication number: CN217370383U
Application number: CN202220683393.0U
Authority: CN
Inventors: 宋泽锴; 项铮宇; 吴超; 宋贤发; 赵璐; 刘富军; 周宁
Original assignee: Ningbo Tuotie Machinery Co ltd
Current assignee: Ningbo Tuotie Machinery Co ltd
Priority date: 2022-03-27
Filing date: 2022-03-27
Publication date: 2022-09-06
Anticipated expiration: 2032-03-27

Abstract

A casting mold structure for a wind power planet carrier casting comprises a casting mold cavity positioned in a sand box, wherein the casting mold cavity comprises a long shaft part, a vertical column part and a short shaft part which are sequentially connected in the axial direction; the outer side of the long shaft part is coated with a first chill, and an inner cavity of the long shaft part is filled with a sand core; a second chiller is arranged on the outer side of the short shaft part, and a third chiller is arranged in the shaft pin hole; the first chill is composed of a plurality of large chill blocks with the axial length equal to that of the long shaft part, the second chill is composed of a plurality of small chill blocks, and the sand core comprises a steel pipe core bar and a sand mould layer coated on the outer side surface of the steel pipe core bar. This application has chill is small in quantity, and the cooling rate of molten iron improves, and the foundry goods tissue is fine and close, does not have shrinkage cavity shrinkage porosity casting defect, and the position homoenergetic of the major axis portion, the minor axis portion and the axle pinhole of planet carrier accords with operation requirement's advantage.

Description

Casting mold structure for wind power planet carrier casting

Technical Field

The application relates to the technical field of wind power planet carrier castings, in particular to a casting mold structure for a wind power planet carrier casting.

Background

Wind energy is a renewable pollution-free clean energy, and is valued by various countries, and the vigorous development of wind energy is a reliable way for solving energy in production and life, so that the wind power industry in the world is rapidly developed, and is the first of various new energy sources with higher acceleration in recent years. With the rapid development of the wind power industry, the demand of wind power nodular cast iron accessories is rapidly increased, the nodular cast iron for wind power is rapidly developed, the nodular cast iron is widely applied at home and abroad due to low cost and high toughness, but compared with common nodular cast iron, the requirements on the quality and the performance of wind power castings are higher, and the requirements on the quality and the service performance of the wind power castings are higher due to the fact that the working environment of a wind turbine is severe and the maintenance is difficult.

The planet carrier product is used as an important component of the wind generating set, and the quality of the planet carrier product directly influences the service life of the whole generating set. Taking an SYZ15 planet carrier as an example, a casting product is shown in figure 1, the blank weight of the product is 2400Kg, the pouring weight is 2650Kg, the material is nodular cast iron QT700-2, the external dimension phi 1156mm multiplied by 1195mm, the maximum wall thickness is 110mm, and the minimum wall thickness is 20 mm; the structure of the casting mainly comprises a casting body 1 ', which is composed of a long shaft part 11 ', a column part 12 ' and a short shaft part 13 ' which are sequentially connected along the axial direction, wherein two ends of the vertical shaft part are provided with an upper web plate and a lower web plate or an upper flange plate and a lower flange plate (the upper web plate and the lower web plate are disc-shaped, the upper web plate is close to the short shaft, the lower web plate is close to the long shaft), and the positions of the upper web plate and the lower web plate are provided with shaft pin holes 14 ' (the upper web plate is in a through hole shape, the lower web plate is in a counter bore shape, and a small cold iron is positioned in the shaft pin hole in the counter bore); because of the special use environment and the specific structure and size, the requirement on the casting quality of the casting is extremely high, and casting defects such as shrinkage cavity, shrinkage porosity and the like are not allowed.

In the existing planet carrier casting method, a large number of small special-purpose forming chills a are arranged on a long shaft part and a short shaft part of a casting, and upper and lower webs and positions for connecting the long shaft part and the short shaft part, and a small special-purpose chilling chiller a is also arranged in an inner hole of the long shaft part, which can be shown in figures 2-5 specifically, the small special-purpose chilling chills are large in usage amount and need to keep gaps, and the appearance (outer surface) of the casting is directly influenced by the positions of the chills after casting is finished, so that the appearance of the casting is uneven, and the grinding workload is increased; in addition, the shape of the large number of small-block formed chills is easy to deform due to temperature mutation, overheating and supercooling in the using process, so that the size of the chills is not accurate and cannot be completely matched with the process size, and the castings are defective or scrapped; the chill needs to be treated by shot blasting, baking and the like before use, so that the management and control difficulty is high, and if the management and control are not good, casting defects such as air holes or slag holes and the like can be generated on the surface of a casting; in addition, the small-sized chills are used in a large number, the number of gaps among the chills is also large, and if the sand is not tightly plugged in the clearance of the chills in the sand casting process, the defects of shrinkage cavity and shrinkage porosity are easy to occur at the clearance of the chills.

SUMMERY OF THE UTILITY MODEL

This application is not enough to prior art's the aforesaid, provides a chill is small in quantity, and the cooling rate of molten iron improves, and the foundry goods tissue is fine and close, does not have shrinkage cavity shrinkage porosity casting defect, and the position homoenergetic of the long axial region of planet carrier, short axial region and axle pinhole accords with the casting mould structure that is used for wind-powered electricity generation planet carrier foundry goods of operation requirement.

In order to achieve the above object, the utility model provides a following technical scheme: a casting mold structure for a wind power planet carrier casting comprises a casting mold cavity positioned in a sand box, wherein the casting mold cavity comprises a long shaft part, a vertical column part and a short shaft part which are sequentially connected in the axial direction; the outer side of the long shaft part is coated with a first chill, and an inner cavity of the long shaft part is filled with a sand core; a second chiller is arranged on the outer side of the short shaft part, and a third chiller is arranged in the shaft pin hole; the first chill is composed of a plurality of large chill blocks with the axial length equal to that of the long shaft part, the second chill is composed of a plurality of small chill blocks, and the sand core comprises a steel pipe core bar and a sand mould layer coated on the outer side surface of the steel pipe core bar.

By adopting the structure, the sand core structure consisting of the steel pipe core bone and the sand core layer coated on the outer side surface of the steel pipe core bone is arranged, so that the original sand core and the original direct chill in the inner cavity of the long shaft part are eliminated, the workload of manufacturing the chills, placing the chills during core making and polishing the chills prints at the inner hole part is reduced, the production cost is directly reduced, and meanwhile, the influence of the direct chills on the quality of molten iron is avoided; the strength of the sand core can be enhanced by arranging the steel pipe core ribs, and the weight of the whole sand core can be reduced; according to the invention, the structure that the large chilling block with the length equal to that of the long shaft part is arranged on the outer side of the long shaft part to replace the traditional small chilling block is adopted, so that the existence of gaps is reduced, and the surface of a casting is more flat; and because the clearance formed between the large chilling block can form compact molding sand through the dead weight of the sand and the sand plugging in two directions (axial direction and radial direction), the condition that the chilling block clearance sand plugging is not compact and the shrinkage cavity and shrinkage porosity defects appear at the chilling block clearance position, which are caused by the multiple clearances and narrow clearances formed by the traditional small chilling blocks, can be avoided.

Furthermore, the first chill comprises a working surface for forming the outer surface of the long shaft part of the casting cavity and a non-working surface arranged in the molding sand, and a plurality of lifting lugs are arranged on the non-working surface; adopt above-mentioned structure, the setting up of lug makes things convenient for the handling of big chill to remove and the upset, and the lug still has concurrently to strengthen the chill fixed in the molding sand, prevents the effect that the chill drops.

Furthermore, six first chills are uniformly distributed on the outer surface of the long shaft part of the casting cavity; with this structure, the number of single blocks of chills can be greatly reduced, and a more desirable casting surface can be formed.

Furthermore, the distance between every two adjacent first chills is 15-35 mm; because the expansion amounts of the large-scale forming chilling blocks and the sand are different when being heated, the space between the large-scale forming chilling blocks is effectively controlled, and the casting surface formed by the sand in the space between the adjacent chilling blocks is more flat.

Furthermore, an exothermic riser and a riser vent are arranged on the outer end face of the short shaft part, and the riser vent is positioned on the upper end face of the exothermic riser; the forming chilling block of original minor axis hole can be cancelled in the setting of this structure to reduce the work load that the preparation of chilling block, placing and surface chilling block trace were polished during the molding, directly reduced manufacturing cost, avoided the chilling block to the influence of molten iron quality simultaneously, realized that the foundry goods does not have the casting of directly giving vent to anger (give vent to anger not directly be connected with the foundry goods die cavity promptly, but connect and realize giving vent to anger on the up end of the rising head that generates heat).

Furthermore, the third chilling block is in a hollow cylindrical shape, a plurality of sand hanging grooves are formed in the outer side surface of the hollow cylindrical third chilling block, and the sand hanging grooves are inwards recessed along the radial direction of the side wall of the third chilling block; by adopting the structure, the cold iron can be better fixed in the molding sand through the hollow center hole of the third cold iron and the sand hanging groove, and the problem that the small indirect cold iron is shifted or falls off under the impact action of high-temperature molten iron and hot waves is prevented.

Furthermore, the axial width of the sand hanging groove is 15 mm-25 mm, and the radial depth is 2 mm-5 mm; by adopting the structure, better filling and fixing effects with the molding sand can be realized.

Furthermore, the distance between the outer side wall of the third chilling block and the inner wall of the shaft pin hole where the third chilling block is located is 10-20 mm; by adopting the structure, the reasonable sand filling thickness between the sand filling chamber and the sand filling chamber can be ensured, the sand is easy to fall off when the thickness of the sand is too thin, and the chilling effect is not good when the thickness of the sand is too thick.

Furthermore, the steel pipe core is arranged in a hollow manner, a sand block or dry sand is filled in the hollow position, and an air outlet rope or a fire-resistant porcelain pipe is led out of the hollow position; the sand block or the dry sand is filled in the hollow position, so that the rapid increase of the molten iron amount for pouring caused by the fact that the molten iron leaks into the hollow inner cavity of the steel pipe core can be prevented, the risk of product scrapping is reduced, and the sand block or the dry sand arranged in the hollow position does not influence the discharge of air; the air in the steel pipe (the air in the steel pipe is easy to expand due to the high temperature of molten iron pouring) is directly led out from the upper box through the air outlet rope (such as the air outlet rope produced by a manufacturer: Chang Li pond refractory material company) pre-arranged in the casting mould or the pre-embedded fire-resistant porcelain pipe or the hollow channel in the casting mould by arranging the air outlet rope or the fire-resistant porcelain pipe in the hollow position, so that the potential safety hazard is avoided, and the molten iron cooling efficiency is improved; according to the structure, when molten iron is poured, the ignition fire is ignited, hot gas in the steel pipe is led out by the burning air, and a casting is chilled.

Furthermore, the steel pipe core rod is provided with an axial bottom plate with one end opening and the other end, and the opening is arranged downwards; by adopting the structure, the risk that molten iron enters the steel pipe core bone can be reduced.

Furthermore, a plurality of steel bars are arranged on the outer side wall of the steel tube core, and the steel bars axially extend along the outer side wall of the steel tube core; by adopting the structure, the sand outside the steel pipe can be better wrapped on the steel pipe, and the problem that the sand outside the steel pipe falls off under the impact action of high-temperature molten iron and heat waves is prevented.

Furthermore, the size of the steel bar is phi 6 mm-8 mm; the steel bars with the sizes are welded and fixed on the outer side wall of the steel pipe core in a welding mode, so that sand on the outer side of the pipe is better wrapped on the steel pipe.

Furthermore, the steel pipe core is provided with a hanging shaft round steel; by adopting the structure, the steel pipe can be conveniently lifted and moved, and the steel shaft round steel is welded on the inner hole of the steel pipe in a perforation way.

Drawings

FIG. 1 is a schematic view of the structure of a casting according to the present application.

FIG. 2 is a schematic structural view (short axis up) of a prior art casting cavity chill arrangement.

Fig. 3 is a schematic structural diagram of a top view of fig. 2.

Fig. 4 is a schematic structural view (short axis upward) of a prior art casting cavity chill arrangement illustrating the upward long axis of the casting of the present application.

FIG. 5 is a schematic top view of a casting of the present application with the long axis portion facing upward.

As shown in the attached drawings, 1 'a casting body, 11' a long shaft part, 12 'a vertical column part, 13' a short shaft part, 14 'a shaft pin hole and a' a small block special-purpose forming chill.

FIG. 6 is a schematic representation of the mold structure of the casting of the present application (with the major axis facing upward).

FIG. 7 is a schematic top view of a cast article of the present application with the long axis of the mold structure facing up.

FIG. 8 is a schematic view of the mold structure of the casting of the present application (minor axis portion up).

FIG. 9 is a schematic top view of a cast article of the present application with the minor axis of the cast structure facing up.

Fig. 10 is a schematic structural view of the first chill of the present application (with the lifting lugs visible).

FIG. 11 is a schematic structural view of a first chiller of the present application (working surface visible).

FIG. 12 is a schematic structural view of a third chiller according to the present application.

Fig. 13 is a schematic structural view of a cross-sectional view of a third chiller according to the present application.

FIG. 14 is a schematic view of the third chilling block of the present application in combination with a pin hole.

Fig. 15 is a schematic structural view of a steel pipe core according to the present invention.

FIG. 16 is a schematic structural view of a cross-sectional view of the casting cavity of the present application after combination with a sand core.

As shown in the attached drawings: 1. the casting mold cavity comprises a casting mold cavity 11, a long shaft part 12, a vertical column part 13, a short shaft part 14, a shaft pin hole 14, a first chill 2, a large chill 21, a large chill block 22, a working surface 23, a non-working surface 3, a sand core 31, a steel pipe core bar 32, a molding sand layer 33, a reinforcing steel bar 4, a second chill 41, a small chill block 5, a third chill 51, a sand hanging groove 6, a lifting lug 6, a heating riser 7, a riser outlet 8, a sand block or dry sand 9 and a hanging shaft round steel 10.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only preferred embodiments, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention;

the casting cavity of the present application has the same dimensional shape as the casting, and therefore, the part names of the various positions of the casting cavity can be understood to be consistent with the part names of the various corresponding positions of the casting.

Further, it is to be noted that: when an element is referred to as being "secured to" (and other means included similarly to "being secured to") another element, it can be directly on the other element or intervening elements may also be present, secured by the intervening elements. When an element is referred to as being "connected" (and its equivalents are included as "connected") to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" (and other manners of "disposed on" that are similarly intended) another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The structural dimension of the casting cavity of the application is consistent with that of the casting of the application, so that the specification dimension and the name of each position in the casting cavity can be understood as the specification dimension and the name corresponding to the casting.

As shown in fig. 6-9 and 15-16, the casting mold structure for a wind power planet carrier casting according to the present invention includes a casting mold cavity 1 located in a sand box (a sand box structure for molding a mold cavity, obtained in a conventional manner of sand box casting in the industry), the casting mold cavity 1 includes a long axis portion 11, an upright post portion 12 and a short axis portion 13, which are axially connected in sequence, two ends of the upright post portion 12 are connected with an upper web plate and a lower web plate (i.e. a disk structure located at two ends of the upright post portion in the axial direction in the drawing, wherein the upper web plate is located near the short axis portion, and the lower web plate is located near the long axis portion), the upper web plate and the lower web plate are provided with shaft pin holes 14 (the upper web plate is in a through hole shape, the lower web plate is in a counter bore shape, a third chill according to the present application is located in the shaft pin hole in the counter bore shape, and no third chill is located in the through hole shape hole; the outer side of the long shaft part 11 is coated with a first chilling block 2, and the inner cavity of the long shaft part 12 is filled with a sand core 3; a second chilling block 4 is arranged on the outer side of the short shaft part 13, and a third chilling block 5 is arranged in the shaft pin hole (as an example, the third chilling block is arranged in a sunk-hole-shaped shaft pin hole); the first chill 2 comprises a plurality of large chill blocks 21 (almost equal in length, slightly deviated and understood as equal in length) with the same axial length as the long shaft part, the second chill 4 comprises a plurality of small chill blocks 41, and the sand core 3 comprises a steel pipe core 31 and a sand layer 32 coated on the outer side surface of the steel pipe core.

As shown in fig. 10 to 11, the first chill 2 according to the present invention comprises a working surface 22 forming the outer surface of the long shaft portion of the casting cavity and a non-working surface 23 embedded in the molding sand (i.e. the working surface is located on the inner side for molding the outer wall of the long shaft of the casting, and the non-working surface is located on the outer side and accommodated in the molding sand), wherein the non-working surface is provided with a plurality of lifting lugs 6; adopt above-mentioned structure, the setting up of lug makes things convenient for the handling of big chill to remove and the upset, and the lug still has concurrently to strengthen the chill fixed in the molding sand, prevents the effect that the chill drops.

As an example, as shown in fig. 6 to 7, the first chiller 2 according to the present application is provided with six blocks, and is uniformly distributed on the outer surface of the long shaft portion 11 of the casting cavity 1; with this structure, the number of single blocks of chills can be greatly reduced and a more desirable casting surface can be formed.

By way of example, the distance between every two adjacent first chills 2 is 15 mm-35 mm, because the first chills are positioned on the outer surface of the long shaft part of the casting cavity and are spliced with each other, a gap is formed between every two adjacent chills, and the gap extends along the axial length; because the expansion amounts of the large-scale forming chilling blocks and the sand are different when being heated, the space between the large-scale forming chilling blocks is effectively controlled, and the casting surface formed by the sand in the space between the adjacent chilling blocks is more flat.

As an example, as shown in fig. 8, an outer end face of the short shaft portion 13 of the present application is provided with a heating riser 7 and a riser vent 8, and the riser vent 8 is located on an upper end face of the heating riser 7; specifically, three heating risers are arranged and are positioned on the end face of the short shaft part, and the outlet of each riser is positioned on the upper part of the outer end face of each heating riser; the forming chilling block in the original minor axis hole can be cancelled in the setting of this structure to the work load that placing and surperficial chilling block trace were polished when having reduced the preparation of chilling block, molding has directly reduced manufacturing cost, simultaneously in order to avoid the chilling block to the influence of molten iron quality, has realized that the foundry goods does not have the casting of directly giving vent to anger (give vent to anger not directly be connected with the foundry goods die cavity promptly, but connect and realize giving vent to anger on the up end of the rising head that generates heat).

As shown in fig. 12 to 14, the third chilling block 5 is hollow and cylindrical, a plurality of sand-hanging grooves 51 are arranged on the outer side surface of the hollow and cylindrical third chilling block, and the sand-hanging grooves 51 are recessed radially inwards along the side wall of the third chilling block 5; by adopting the structure, the cold iron can be better fixed in the molding sand through the hollow center hole of the third cold iron and the sand hanging groove, and the problem that the small indirect cold iron is shifted or falls off under the impact action of high-temperature molten iron and hot waves is prevented.

By way of example, the axial width of the sand hanging groove 51 is 15 mm-25 mm, and the radial depth is 2 mm-5 mm; with this structure, a better fixing effect can be achieved.

As an example, as shown in fig. 14, the distance between the outer sidewall of the third chilling block 5 and the inner wall of the pin hole 14 where the third chilling block is located is 10mm to 20mm (specifically, the radial distance between the outermost sidewall of the third chilling block and the inner wall of the corresponding pin hole); by adopting the structure, the reasonable sand filling thickness between the sand filling chamber and the sand filling chamber can be ensured, the sand is easy to fall off when the thickness of the sand is too thin, and the chilling effect is not good when the thickness of the sand is too thick.

As shown in fig. 15 and 16, the steel tube core 31 is hollow, and the hollow position is filled with a sand block or dry sand 9, and the hollow position is further led with an air outlet rope or a fire-resistant porcelain tube (specifically, in fig. 16, an air outlet rope is led out from the hollow cavity of the steel tube core, and a fire-resistant porcelain tube can also be arranged); the sand block or the dry sand is filled in the hollow position, so that the rapid increase of the molten iron amount for pouring caused by the fact that the molten iron leaks into the hollow inner cavity of the steel pipe core can be prevented, the risk of product scrapping is reduced, and the sand block or the dry sand arranged in the hollow position does not influence the discharge of air; the air in the steel pipe (the air in the steel pipe is easy to expand due to the high temperature of molten iron pouring) is directly led out from the upper box through the air outlet rope (such as the air outlet rope produced by a manufacturer: Chang Li pond refractory material company) pre-arranged in the casting mould or the pre-embedded fire-resistant porcelain pipe or the hollow channel in the casting mould by arranging the air outlet rope or the fire-resistant porcelain pipe in the hollow position, so that the potential safety hazard is avoided, and the molten iron cooling efficiency is improved; the structure can be ignited by ignition when molten iron is poured, hot gas in the steel pipe is led out by burning air, and a casting is chilled.

Specifically, as shown in fig. 15 and 16, the steel tube core 31 of the present application is a cylindrical hollow structure having an axial opening and an axial bottom plate, and the opening is disposed downward, that is, on the same side as the opening side of the long shaft portion (the sand box of the present application may be provided with a cope box, a drag box and a drag box, which are combined with each other to form a cavity, and the combination position has a parting surface, so that when the sand boxes around the casting cavity are combined with each other to form the casting cavity, in order to prevent molten iron from entering the interior of the steel tube core from the parting surface to increase the molten iron amount, the opening is disposed downward, thereby reducing the probability of the molten iron entering the interior of the steel tube core and preventing the molten iron from filling the interior of the steel tube core), and the cavity of the hollow structure is filled with sand blocks or dry sand; by adopting the structure, when molten iron is poured, the ignition fire is ignited, and hot gas in the steel pipe is led out by the burning air, so that the casting is chilled.

As shown in fig. 15, a plurality of steel bars 33 are disposed on the outer side wall of the steel pipe core 31, and the steel bars 33 extend axially along the outer side wall of the steel pipe core 31; by adopting the structure, the sand outside the steel pipe can be better wrapped on the steel pipe, and the problem that the sand outside the steel pipe falls off under the impact action of high-temperature molten iron and heat waves is prevented.

As an example, the size of the steel bar 33 described in the present application is Φ 6mm to 8 mm; concrete can be through welded mode with the reinforcing bar welded fastening of this kind of size on the lateral wall of steel pipe core bone, the setting of reinforcing bar can improve the area of contact between molding sand and the steel pipe core bone, in order to realize wrapping up the grit in the pipe outside on the steel pipe better.

As shown in fig. 15, a steel pipe core 31 of the present application is provided with a suspension axis round steel 10; by adopting the structure, the steel pipe can be conveniently lifted and moved, and the steel shaft round steel is welded on the inner hole of the steel pipe in a perforation way.

The planet carrier casting obtained by the casting mold is well formed, the formed matrix structure is compact, 100% ultrasonic flaw detection and 100% magnetic particle flaw detection are carried out on the casting, the ultrasonic flaw detection meets the requirements of EN12680-3 standard grade 01, and the magnetic particle flaw detection meets the requirements of EN1369 standard grade 1.

Claims

1. The utility model provides a casting mould structure for wind-powered electricity generation planet carrier foundry goods which characterized in that: the structure comprises a casting cavity positioned in a sand box, wherein the casting cavity comprises a long shaft part, a vertical column part and a short shaft part which are sequentially connected in the axial direction, the two ends of the vertical column part are connected with an upper web plate and a lower web plate, and the upper web plate and the lower web plate are provided with shaft pin holes; the outer side of the long shaft part is coated with a first chill, and an inner cavity of the long shaft part is filled with a sand core; a second chiller is arranged on the outer side of the short shaft part, and a third chiller is arranged in the shaft pin hole; the first chill is composed of a plurality of large chill blocks with the axial length equal to that of the long shaft part, the second chill is composed of a plurality of small chill blocks, and the sand core comprises a steel pipe core bar and a sand mould layer coated on the outer side surface of the steel pipe core bar.

2. The casting mold structure for the wind power planet carrier casting according to claim 1, wherein: the first chilling block comprises a working surface and a non-working surface, wherein the working surface forms the outer surface of the long shaft part of the casting cavity, the non-working surface is arranged in the molding sand, and a plurality of lifting lugs are arranged on the non-working surface.

3. The casting mold structure for the wind power planet carrier casting as claimed in claim 2, wherein: the first chilling block is provided with six blocks which are uniformly distributed on the outer surface of the long shaft part of the casting cavity; the distance between every two adjacent first chills is 15-35 mm.

4. The casting mold structure for the wind power planet carrier casting according to claim 1, wherein: and a heating riser and a riser vent are arranged on the outer end face of the short shaft part.

5. The casting mold structure for the wind power planet carrier casting according to claim 1, wherein: the third chiller is hollow cylindrical, a plurality of sand hanging grooves are formed in the outer side face of the hollow cylindrical third chiller, and the sand hanging grooves are formed along the radial inward depression of the side wall of the third chiller.

6. The casting mold structure for the wind power planet carrier casting according to claim 5, wherein: the axial width of the sand hanging groove is 15 mm-25 mm, and the radial depth is 2 mm-5 mm; the distance between the outer side wall of the third chilling block and the inner wall of the shaft pin hole where the third chilling block is located is 10-20 mm.

7. The casting mold structure for the wind power planet carrier casting according to claim 1, wherein: the steel pipe core is hollow, sand blocks or dry sand are filled in the hollow position, and an air outlet rope or a fire-resistant porcelain pipe is led out of the hollow position.

8. The casting mold structure for the wind power planet carrier casting according to claim 7, wherein: a plurality of steel bars are arranged on the outer side wall of the steel tube core, and the steel bars axially extend along the outer side wall of the steel tube core; the steel pipe core rod is provided with an axial bottom plate with one end opening and the other end, and the opening is arranged downwards.

9. The casting mold structure for the wind power planet carrier casting according to claim 8, wherein: the size of the steel bar is phi 6 mm-8 mm.

10. The casting mold structure for the wind power planet carrier casting according to claim 8, wherein: and the steel pipe core is provided with a hanging shaft round steel.