Wind generating set planet carrier co-container sand box

Abstract

The invention relates to the technical field of sand boxes, in particular to a wind generating set planet carrier co-container sand box which is characterized in that an upper sand box inner container, an upper sand box shell and an upper sand box outer frame are connected through a plurality of upper connecting rods penetrating through the upper sand box inner container, the upper sand box shell and the upper sand box outer frame; a sprue is formed in the upper part of the cope flask shell and is communicated with the cope flask inner container; the lower sand box inner container, the lower sand box shell and the lower sand box outer frame are connected through a plurality of lower connecting rods penetrating through the lower sand box inner container, the lower sand box shell and the lower sand box outer frame, each lower connecting rod is sleeved with a hollow sleeve, and the upper end of each hollow sleeve is connected with the outside through an upper through groove formed in the lower sand box shell. The lower end of each hollow sleeve is connected with the outside through a lower through groove formed in the bottom of the lower sand box outer frame, through the structure, balanced solidification and directional solidification of a casting are achieved, shrinkage porosity is reduced, and therefore the casting technology without the chilling block riser is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of sand boxes, in particular to a planetary frame common sand box for a wind turbine generator set. Background Art

[0002] The planet carrier is one of the important parts in the gear transmission of the wind turbine gearbox. The planet carrier mainly plays the role of supporting the planetary wheels and planetary wheel shafts.

[0003] The common sand box is a special sand box structure, which mainly provides the cavity required for the molding of the planetary carrier casting, so that the metal melt can be filled and the casting can be completely molded during the casting process. In the prior art, the configured molding sand is filled into the cavity of the common sand box, compacted, and the preheated molten metal is poured into the cavity of the common sand box through the gate. The molten metal is cooled and solidified into a planetary carrier casting in the cavity of the common sand box. After the casting is completed, the planetary carrier casting is taken out of the common sand box.

[0004] The existing process adopts the design of iron mold sand box. Although it greatly reduces the amount of sand consumed, a sand box needs to be designed for each model, resulting in high design cost, long design cycle, low efficiency, and uneven cooling of castings with large differences in wall thickness, making it difficult to achieve directional and balanced solidification. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects in the prior art and provide a planetary carrier common flask for a wind turbine generator set.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is to design a wind turbine planetary frame common flask, including an upper flask outer frame, a detachable upper flask shell is provided in the upper flask outer frame, a detachable upper flask liner is provided in the upper flask shell, the upper flask liner, the upper flask shell and the upper flask outer frame are connected by a plurality of upper connecting rods penetrating the upper flask liner, the upper flask shell and the upper flask outer frame, and a gate is provided on the upper part of the upper flask shell to communicate with the upper flask liner; It also includes a lower sand box outer frame, a detachable lower sand box shell is provided in the lower sand box outer frame, a detachable lower sand box liner is provided in the lower sand box shell, the lower sand box liner, the lower sand box shell and the lower sand box outer frame are connected by a plurality of lower connecting rods penetrating the lower sand box liner, the lower sand box shell and the lower sand box outer frame, a hollow sleeve is sleeved on each of the lower connecting rods, the upper end of each of the hollow sleeves is connected to the outside through an upper through groove opened on the lower sand box shell, and the lower end of each of the hollow sleeves is connected to the outside through a lower through groove opened at the bottom of the lower sand box outer frame, and cooling gas can enter the hollow sleeve through the lower through groove And it flows out from the upper through groove to cool the sand mold. The above structure can transport cooling gas with different flow rates, effectively accelerate the cooling speed of the casting after casting, improve the performance of the casting, achieve balanced solidification and directional solidification of the casting, reduce shrinkage, thereby realizing a casting process without cold iron riser, and can promote uniform and rapid solidification of the casting, improve the performance of the casting, and because the inner liner is detachable, the sand mold is more applicable. Without changing the outer frame and the shell, the shape of the sand core can be changed to adapt to products of different sizes and shapes, which can make the shell and the outer frame reused, thereby reducing production costs.

[0007] A further preferred technical solution is that a plurality of fixing blocks are fixedly connected to the middle of the upper sand box outer frame, the plurality of fixing blocks are equidistantly distributed, and the plurality of fixing blocks are arranged at the top position of the upper sand box outer frame. The upper sand box outer frame and the middle of the upper sand box shell are provided with a plurality of fixing bolts, and the upper sand box shell is installed on the fixing blocks through fixing bolts. Through the above structure, the inner liner and the outer frame can be quickly connected, which can adapt to the requirements of castings of different types and sizes, and can evenly distribute the stress between the inner liner and the outer frame, reducing the risk of stress concentration and fatigue damage, thereby improving the durability and service life of the casting.

[0008] A further preferred technical solution is that two fixing rods are fixedly connected to the top of the upper sand box outer frame, and the two fixing rods are symmetrically arranged. A mounting groove is opened in the middle of the fixing rod, a pulley is rollingly connected to the middle of the mounting groove, and the two pulley side walls are rotatably connected to a connecting rod, a sleeve is slidingly connected to the middle of the connecting rod, and a feed hopper is fixedly connected to the middle of the sleeve, and the top of the feed hopper is a bell-mouth arrangement. Through the above structure, the molten metal can be accurately aligned with the gate for casting, thereby reducing the deviation of the molten metal during the casting process and the waste of the molten metal. Through precise casting, the shrinkage compensation of the gate can be effectively utilized, thereby reducing the keyhole and shrinkage defects inside the casting.

[0009] A further preferred technical solution is that two groups of first fixing plates are fixedly connected to the side walls of the lower sand box outer frame, the two groups of first fixing plates are symmetrically arranged, an elastic telescopic rod is fixedly connected to the top of the first fixing plate, a spring is fixedly connected to the top of the first fixing plate, the spring is arranged outside the elastic telescopic rod, and two groups of second fixing plates are fixedly connected to the bottom of the upper sand box outer frame, the two groups of second fixing plates are symmetrically arranged with the first fixing plates, and a fixing component is installed in the middle of the first fixing plate. Through the above structure, multiple positions of the upper sand box outer frame can be evenly lifted up, so that the casting can be subjected to uniform force during the removal process after solidification, thereby reducing the problem of deformation of the casting caused by uneven gravity during removal.

[0010] A further preferred technical solution is that the fixing assembly includes an articulated shaft, the articulated shaft is fixedly connected to the end of the first fixed plate, the middle part of the articulated shaft is rotatably connected to a positioning plate, the positioning plate is installed with a screw, and the end of the second fixed plate is provided with a fixing hole, the screw is threadedly connected to the fixing hole. Through the above structure, the impact caused by the high temperature and pressure of the molten metal can be reduced during the casting process, and the movement or deformation of the upper sand box outer frame caused by the impact can be reduced, thereby ensuring stability during the casting process.

[0011] A further preferred technical solution is that the lower sand box outer frame is provided with a plurality of lower belly plates to form a compartment connected to the outside world. Through the above structure, a large amount of heat energy released by the molten metal during the casting process can be dissipated in time, thereby reducing the quality and performance of the casting caused by the high temperature of the molten metal, and effectively improving the heat dissipation efficiency during the casting process.

[0012] A further preferred technical solution is that a buffer pad is installed at the end of the elastic telescopic rod, and the buffer pad is fixedly connected to the top of the elastic telescopic rod.

[0013] A further preferred technical solution is that the installation groove passes through one end of the fixing rod, and the pulley can be installed and removed in the middle of the installation groove.

[0014] The advantages and beneficial effects of the present invention are: 1. The planetary frame common sand box of a wind turbine generator set described in the present invention can transport cooling gas with different flow rates through the above-mentioned structure, effectively accelerate the cooling rate of the casting after casting, improve the performance of the casting, achieve balanced solidification and directional solidification of the casting, reduce shrinkage, thereby realizing a casting process without cold iron risers, and can promote uniform and rapid solidification of the casting, thereby improving the performance of the casting.

[0015] 2. The planetary frame common liner sand box of a wind turbine generator set described in the present invention can quickly connect the inner liner and the outer frame through the above-mentioned structure, can adapt to the requirements of castings of different types and sizes, can evenly distribute the stress between the inner liner and the outer frame, reduce the risk of stress concentration and fatigue damage, and thus improve the durability and service life of the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a stereogram of the present invention; Figure 2 It is an exploded view of the lower sand box liner in the present invention; Figure 3 It is a schematic structural diagram of the long axis in the present invention; Figure 4 is an exploded view of the fixing assembly in the present invention; Figure 5 It is a structural schematic diagram of the feed hopper in the present invention.

[0017] In the figure: 1. lower sand box shell; 2. lower sand box outer frame; 3. lower connecting rod; 4. lower sand box liner; 5. upper sand box shell; 6. upper sand box outer frame; 7. upper sand box liner; 8. lower belly plate; 9. connecting flange; 10. hollow sleeve; 20. fixing block; 21. fixing bolt; 30. fixing rod; 31. mounting groove; 32. pulley; 33. connecting rod; 34. sleeve; 35. feed hopper; 40. first fixed plate; 41. elastic telescopic rod; 42. spring; 43. second fixed plate; 44. buffer pad; 50. hinge shaft; 51. positioning plate; 52. fixing hole; 53. screw. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] like Figures 1 to 3As shown, a planetary frame common flask of a wind turbine generator set according to an embodiment of the present invention comprises a lower flask outer frame 2, a lower flask shell 1 is installed in the lower flask outer frame 2, a lower flask liner 4 is installed in the lower flask shell 1, the lower flask shell 1 and the lower flask liner 4 have matching flanges, the lower flask outer frame 2, the lower flask shell 1 and the lower flask liner 4 are connected by a plurality of lower connecting rods 3, the lower connecting rods 3 pass through the lower flask shell 1 from the bottom of the lower flask outer frame 2 and are connected to the outside of the lower flask liner 4, the lower connecting rods 3 can be connected to the lower flask liner 4 by threads, or can be fixed on the lower flask liner 4, and then the other end of the lower connecting rods 3 is connected to the lower flask outer frame 2 by a connecting flange 9, the lengths of the lower connecting rods 3 are different, mainly according to different connection positions, a hollow sleeve 10 is set on each of the lower connecting rods 3, and the upper end of the hollow sleeve 10 corresponds to the upper end of the lower flask shell 1 A stepped trough is provided, and the stepped trough is connected to the outside through an upper groove arranged on the lower sand box shell 1 by a loop line, and a stepped trough is also provided on the lower sand box outer frame 2 corresponding to the lower end of the hollow sleeve 10, and the stepped trough is connected to the outside through a lower groove arranged on the lower sand box outer frame 2 by a loop line, and the cooling gas can enter the hollow sleeve 10 through the lower groove and flow out from the upper groove to cool the casting. Through the above structure, cooling gas of different flow rates can be transported, which effectively accelerates the cooling speed of the casting after casting, improves the performance of the casting, realizes balanced solidification and directional solidification of the casting, reduces shrinkage, thereby realizing a casting process without cold iron risers, and can promote uniform and rapid solidification of the casting, improve the performance of the casting, and because the inner liner is detachable, the applicability of the sand box is stronger, and the shape of the inner liner can be changed without changing the outer frame and the shell to adapt to products of different sizes and shapes, which can make the shell and the outer frame reused and reduce production costs.

[0020] It also includes an upper sand box outer frame 6, in which an upper sand box shell 5 is installed, in which an upper sand box liner 7 is installed, the upper sand box shell 5 and the upper sand box liner 7 have matching flanges, the upper sand box outer frame 6, the upper sand box shell 5, and the upper sand box liner 7 are connected by a plurality of upper connecting rods, the upper connecting rods pass through the upper sand box shell 5 from the top of the upper sand box outer frame 6 and are connected to the outside of the upper sand box liner 7, the upper connecting rods can be connected to the upper sand box liner 7 by threads, or can be fixed on the upper sand box liner 7, and then the other end of the upper connecting rod is connected to the upper sand box outer frame 6 by a connecting flange 9, The upper sand box outer frame 6 can be installed on the lower sand box outer frame 2, and the upper sand box shell 5 can be buckled on the lower sand box shell 1, and the upper sand box liner 7 can be buckled on the lower sand box liner 4. A gate is opened on the upper part of the upper sand box shell 5 to communicate with the upper sand box liner 7, and is connected to the pouring seat at the bottom of the lower sand box liner 4 through a runner.

[0021] like Figures 1 to 3 As shown, a plurality of fixing blocks 20 are fixedly connected to the middle of the upper sand box outer frame 6, and the plurality of fixing blocks 20 are equidistantly distributed. The plurality of fixing blocks 20 are arranged at the top position of the upper sand box outer frame 6. The upper sand box shell 5 and the middle of the upper sand box outer frame 6 are provided with a plurality of fixing bolts 21. The upper sand box shell 5 is mounted on the fixing blocks 20 by the fixing bolts 21, and the lower sand box shell 1 is mounted in the middle of the upper sand box outer frame 6 by the fixing bolts 21. When working, the corresponding models of the lower sand box liner 1 and the upper sand box liner 7 are selected according to the outline size of the product, and the lower sand box liner 4 is fixed. The upper sand box liner 7 is placed in the corresponding lower sand box outer frame 2 and upper sand box outer frame 6, and the upper sand box shell 5 is installed in the multiple fixing blocks 20 in the middle of the upper sand box outer frame 6 by fixing bolts 21, so that the upper sand box liner 5 is fixed in the middle of the upper sand box outer frame 6. Through the above structure, the inner liner and the outer frame can be quickly connected, which can adapt to the requirements of castings of different types and sizes, and can evenly distribute the stress between the shell, the inner liner and the outer frame, reducing the risk of stress concentration and fatigue damage, thereby improving the durability and service life of the casting.

[0022] like Figure 1 and Figure 5 As shown, two fixing rods 30 are fixedly connected to the top of the upper sand box outer frame 6, and the two fixing rods 30 are symmetrically arranged. A mounting groove 31 is opened in the middle of the fixing rod 30, and a pulley 32 is rollingly connected in the middle of the mounting groove 31. The side walls of the two pulleys 32 are rotatably connected with a connecting rod 33, and a sleeve 34 is slidably connected in the middle of the connecting rod 33. A feed hopper 35 is fixedly connected in the middle of the sleeve 34, and the top of the feed hopper 35 is arranged in a bell mouth. A plurality of gates are opened on the upper part of the upper sand box shell to communicate with the upper sand box liner. When the casting process is in progress, the connecting rod 33 is passed through the pulleys 32 at both ends in the mounting groove. The material is poured into the feed hopper 35 and enters the gate 10 through the feed hopper 35, thereby realizing precise casting. The above structure can accurately align the molten metal with the gate 10 for casting, thereby reducing the deviation of the molten metal during the casting process and resulting in waste of the molten metal. The shrinkage compensation of the gate 10 can be effectively utilized through precise casting, thereby reducing the lock hole and shrinkage defects inside the casting.

[0023] like Figure 1 and Figure 4 As shown, the side wall of the lower sand box outer frame 2 is fixedly connected with two groups of first fixing plates 40, and the two groups of the first fixing plates 40 are symmetrically arranged. The top of the first fixing plate 40 is fixedly connected with an elastic telescopic rod 41, and the top of the first fixing plate 40 is fixedly connected with a spring 42, and the spring 42 is arranged outside the elastic telescopic rod 41. The bottom of the upper sand box outer frame 6 is fixedly connected with two groups of second fixing plates 43, and the two groups of the second fixing plates 43 are arranged correspondingly to the first fixing plates 40. A fixing component is installed in the middle of the first fixing plate 40. When working, when the upper sand box outer frame 6 is placed on the lower sand box outer frame 2, the second fixing plates 43 The corresponding elastic telescopic rods 41 and springs 42 are in contact with each other, and the upper sand box outer frame 6 is pressed downward. The squeezed ends of the elastic telescopic rods 41 shrink inwards, and the springs 42 are squeezed and shrunk at the same time. The elastic telescopic rods 41 and the springs 42 are kept in a contracted state through the fixing assembly. When the casting is completed, the fixing assembly is opened, and the elastic telescopic rods 41 and the springs 42 lift up the upper sand box outer frame 6 evenly through elastic force. The above structure can lift up multiple positions of the upper sand box outer frame 6 evenly, so that the casting can be subjected to uniform force during the removal process after solidification, thereby reducing the problem of deformation of the casting caused by uneven gravity during removal.

[0024] like Figure 1 and Figure 4 As shown, the fixing assembly includes an articulated shaft 50, which is fixedly connected to the end of the first fixing plate 40, and a positioning plate 51 is rotatably connected to the middle of the articulated shaft 50, and a screw 53 is installed on the positioning plate 51. A fixing hole 52 is opened at the end of the second fixing plate 43, and the screw 53 is threadedly connected to the fixing hole 52. When working, when the second fixing plate 43 applies pressure to the elastic telescopic rod 41 and the spring 42, the positioning plate 51 is rotated upward through the articulated shaft 50, and the screw 53 is installed in the middle of the positioning plate 51. At the same time, the end of the screw 53 enters the corresponding fixing hole 52, and the screw 53 is rotated, and the second fixing plate 43 is fixed by the cooperation of the screw 53 and the positioning plate 51. When the screw 53 is rotated out of the fixing hole 52, the positioning plate 51 is rotated downward and retracted. The above structure can reduce the impact caused by the high temperature and pressure of the molten metal during the casting process, reduce the movement or deformation of the upper sand box outer frame 6 caused by the impact, ensure the stability of the casting process, keep the cavity structure between the lower sand box outer frame 2 and the upper sand box outer frame 6 stable, increase the size and shape of the casting to achieve the predetermined effect, and reduce the scrap rate caused by the decrease in precision.

[0025] like Figure 3As shown, the lower sand box outer frame 2 is provided with a plurality of lower belly plates 8 to form a compartment connected to the outside. During operation, when the casting is solidified, the heat dissipated from the inside is conducted out through the lower sand box outer frame 2 to increase the cooling rate of the casting. Through the above structure, a large amount of heat energy released by the molten metal during the casting process can be dissipated in time, reducing the quality and performance of the casting caused by the high temperature of the molten metal, effectively improving the heat dissipation efficiency during the casting process, making the temperature inside the lower sand box outer frame 2 evenly distributed, and reducing the thermal stress caused by uneven temperature.

[0026] like Figure 4 As shown, a buffer pad 44 is installed at the end of the elastic telescopic rod 41, and the buffer pad 44 is fixedly connected to the top of the elastic telescopic rod 41. During operation, when the second fixed plate 43 applies downward pressure, it first contacts the buffer pad 44, and the buffer pad 7 absorbs the impact force when the second fixed plate 43 applies downward pressure. The above structure can absorb and disperse the impact force of the second fixed plate 43 on the end of the elastic telescopic rod 41, which can reduce the problem of damage caused by the second fixed plate 43 directly applying pressure to the elastic telescopic rod 41 and provide stable support for it.

[0027] like Figure 5 As shown, the installation groove 31 passes through one end of the fixed rod 30, and the pulley 32 can be installed and removed in the middle of the installation groove 31. During operation, when casting, the pulley 32 is placed into the installation groove 31 from one end of the fixed rod 30. When the casting is completed, the pulley 32 is slid out of the installation groove 31 to realize the disassembly, storage and installation of the feed hopper 35. Through the above structure, the feed hopper 35 can be installed and disassembled, and when not in use, the pulley 32 can be slid out of the fixed rod 30 for separate storage, and the space occupied by the upper sand box outer frame 6 can be reduced, which is convenient for storing the upper sand box outer frame 6.

[0028] During operation, first place the lower sand box shell 1 inside the lower sand box outer frame 2, then install the lower sand box liner 4 inside the lower sand box shell 1, install the corresponding lower sand box liner 4 on the lower sand box shell 1, and multiple lower connecting rods 14 at the bottom of the lower sand box outer frame penetrate the middle of the lower sand box shell 1, and then place the upper sand box liner 5 and the buffer pad 44 in the upper sand box outer frame 6 in sequence. During casting, the bottom of the upper sand box outer frame 6 corresponds to the top of the lower sand box outer frame 2, and the molten metal is injected into the corresponding gate 10 to allow the molten metal to enter the inner cavity. The designed outer frame forms a compartment connected to the outside world through the lower belly plate 13. After the casting is completed, cooling gas is introduced through the hollow casing, and the cooling gas is transported according to the thermal modulus of the casting. The corresponding model of the lower sand box is selected according to the outline size of the product. The box liner 1 and the upper sand box liner 7, the lower sand box liner 4 and the upper sand box liner 7 are placed in the corresponding lower sand box outer frame 2 and the upper sand box outer frame 6, and the upper sand box shell 5 is installed in the multiple fixing blocks 20 in the middle of the upper sand box outer frame 6 by fixing bolts 21, so that the upper sand box shell 5 is fixed in the middle of the upper sand box outer frame 6, and the lower sand box shell 5 is placed in the middle of the lower sand box outer frame 2, and the lower sand box shell 5 is installed in the lower sand box outer frame 2 by fixing bolts 21 to fix it. During the casting process, the connecting rod 33 is moved inside the mounting groove 31 through the pulleys 32 at both ends, and the feed hopper 35 is pushed at the same time, driving the sleeve 34 to slide in the middle of the connecting rod 33, so that the feed hopper 35 can be moved freely, and the bottom of the feed hopper 35 is moved to the casting position corresponding to the specified position. The material is then poured into the feed hopper 35 and enters the gate 10 through the feed hopper 35, thereby achieving precise casting. When the upper sand box outer frame 6 is placed on the lower sand box outer frame 2, the second fixed plate 43 contacts the corresponding elastic telescopic rod 41 and the end of the spring 42, and the upper sand box outer frame 6 is pressed downward. The squeezed end of the elastic telescopic rod 41 contracts inwardly, and the spring 42 is squeezed and contracted. The elastic telescopic rod 41 and the spring 42 are kept in a contracted state through the fixing assembly. When the casting is completed, the fixing assembly is opened, and the elastic telescopic rod 41 and the spring 42 evenly lift the upper sand box outer frame 6 through elastic force. After the second fixed plate 43 applies pressure to the elastic telescopic rod 41 and the spring 42, the positioning plate 51 is rotated upward through the hinge shaft 50 to The screw 53 is installed in the middle of the positioning plate 51, and the end of the screw 53 enters the corresponding fixing hole 52, and the screw 53 is rotated. The second fixing plate 43 is fixed by the cooperation of the screw 53 and the positioning plate 51. When the screw 53 is rotated out of the fixing hole 52, the positioning plate 51 is rotated downward and retracted. During assembly, the upper sand box outer frame 6 and the lower sand box outer frame 2 can be buckled by external pressure so that the screw 53 and the fixing hole 52 are aligned. During disassembly, the upper sand box outer frame 6 can also be pressed against the lower sand box outer frame 2 by external pressure so that the screw 53 is separated from the fixing hole. During the solidification process of the casting, the heat dissipated from the inside is conducted out through the upper sand box outer frame 6 to increase the cooling speed of the casting. When the second fixing plate 43 is pressed downward, it first contacts with the buffer pad 44.The impact force of the second fixing plate 43 pressing downward is absorbed by the buffer pad 44. When casting, the pulley 32 is placed into the installation groove 31 from one end of the fixing rod 30. When casting is completed, the pulley 32 is slid out of the installation groove 31, so that the feed hopper 35 can be disassembled, stored, and installed for use.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A planetary frame common flask for a wind turbine generator set, characterized in that: It comprises an upper sand box outer frame, a detachable upper sand box shell is arranged in the upper sand box outer frame, a detachable upper sand box liner is arranged in the upper sand box shell, the upper sand box liner, the upper sand box shell and the upper sand box outer frame are connected by a plurality of upper connecting rods penetrating the upper sand box liner, the upper sand box shell and the upper sand box outer frame, and a gate is opened on the upper part of the upper sand box shell to communicate with the upper sand box liner; It also includes a lower sand box outer frame, a detachable lower sand box shell is provided in the lower sand box outer frame, a detachable lower sand box liner is provided in the lower sand box shell, the lower sand box liner, the lower sand box shell and the lower sand box outer frame are connected by a plurality of lower connecting rods penetrating the lower sand box liner, the lower sand box shell and the lower sand box outer frame, a hollow sleeve is sleeved on each of the lower connecting rods, the upper end of each of the hollow sleeves is connected to the outside through an upper through groove opened on the lower sand box shell, and the lower end of each of the hollow sleeves is connected to the outside through a lower through groove opened at the bottom of the lower sand box outer frame, and the cooling gas can enter the hollow sleeve through the lower through groove and flow out from the upper through groove to cool the sand mold.

2. A planetary carrier common flask for a wind turbine generator set according to claim 1, characterized in that: A plurality of fixing blocks are fixedly connected to the middle of the upper sand box outer frame, and the plurality of fixing blocks are equidistantly distributed. The plurality of fixing blocks are arranged at the top position of the upper sand box outer frame. The upper sand box outer frame and the middle of the upper sand box shell are both provided with a plurality of fixing bolts, and the upper sand box shell is mounted on the fixing blocks by fixing bolts.

3. A planetary carrier common flask for a wind turbine generator set according to claim 1, characterized in that: Two fixing rods are fixedly connected to the top of the upper sand box outer frame, and the two fixing rods are symmetrically arranged. A mounting groove is opened in the middle of the fixing rod, a pulley is rollingly connected in the middle of the mounting groove, and the two pulley side walls are rotatably connected to a connecting rod, a sleeve is slidably connected in the middle of the connecting rod, a feed hopper is fixedly connected in the middle of the sleeve, and the top of the feed hopper is arranged in a bell-mouth manner.

4. A planetary carrier common flask for a wind turbine generator set according to claim 3, characterized in that: Two groups of first fixing plates are fixedly connected to the side walls of the lower sand box outer frame, and the two groups of first fixing plates are symmetrically arranged. An elastic telescopic rod is fixedly connected to the top of the first fixing plate, and a spring is fixedly connected to the top of the first fixing plate, and the spring is arranged outside the elastic telescopic rod. Two groups of second fixing plates are fixedly connected to the bottom of the upper sand box outer frame, and the two groups of second fixing plates are symmetrically arranged with the first fixing plate, and a fixing component is installed in the middle of the first fixing plate.

5. A planetary carrier common flask for a wind turbine generator set according to claim 4, characterized in that: The fixing assembly includes an articulated shaft, which is fixedly connected to the end of a first fixing plate. A positioning plate is rotatably connected to the middle of the articulated shaft. A screw is installed on the positioning plate. A fixing hole is opened at the end of the second fixing plate. The screw is threadedly connected to the fixing hole.

6. A planetary carrier common flask for a wind turbine generator set according to claim 4, characterized in that: A buffer pad is installed at the end of the elastic telescopic rod, and the buffer pad is fixedly connected to the top of the elastic telescopic rod.

7. The planetary carrier common flask of a wind turbine generator set according to claim 3, characterized in that: The installation slot passes through one end of the fixing rod, and the pulley can be installed and removed in the middle of the installation slot.

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