Universal cooling device for low-pressure casting of motor rotor

Abstract

The utility model relates to a general cooling device for low-pressure casting of a motor rotor, belongs to the technical field of motor rotor casting equipment, and solves the technical problem that a shrinkage cavity exists in an air cooling rear end ring after low-pressure casting of an existing motor rotor. According to the solution, the general cooling device for low-pressure casting of the motor rotor is arranged on a low-pressure casting machine, the low-pressure casting machine comprises a hydraulic cylinder, a hydraulic cylinder bottom plate and an upper die, the hydraulic cylinder bottom plate comprises an upper hydraulic cylinder bottom plate and a lower hydraulic cylinder bottom plate, a first sliding groove is formed in the lower end of the upper hydraulic cylinder bottom plate, and a second sliding groove is formed in the upper end of the lower hydraulic cylinder bottom plate; the first sliding groove and the second sliding groove form a sliding groove area. The cooling device comprises a circular steel pipe and a plurality of cooling units, the circular steel pipe is arranged on the outer side of the hydraulic cylinder bottom plate, and the cooling units are evenly distributed on the circular steel pipe and used for cooling the upper die. Compared with the prior art, the die has the advantages that the structure is simple, the operation is convenient, the die cooling effect is improved, and no shrinkage cavity exists on the motor rotor end ring.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor rotor casting equipment, and particularly relates to a general cooling device for low-pressure casting of motor rotors. Background Art

[0002] Low-pressure casting is a method in which molten metal fills the cavity from bottom to top under pressure and solidifies under pressure. Due to its versatility, low-pressure casting is widely used in the production of aluminum alloy castings in the automotive, motorcycle, instrument, textile machinery and aerospace industries.

[0003] The low-pressure casting process is used for motor rotors because of the advantages of good rotor quality and high metal utilization rate. However, the low-pressure casting of motor rotors is completely different from that of other low-pressure casting products such as automobile wheels and cylinder block parts. The low-pressure casting equipment for motor rotors is generally non-standard equipment, which has special properties to meet the requirements of motor casting. At present, the general cooling method for low-pressure casting of motor rotors is air cooling. However, air cooling generally causes shrinkage holes on the end rings of motor rotors. Summary of the Utility Model

[0004] In order to overcome the deficiencies of the prior art and solve the technical problems such as shrinkage holes on the end rings after air cooling in the existing low-pressure casting of motor rotors, the utility model provides a general cooling device for low-pressure casting of motor rotors.

[0005] The utility model is realized through the following technical solutions.

[0006] The utility model provides a general cooling device for low-pressure casting of motor rotors, which is arranged on a low-pressure casting machine. The low-pressure casting machine includes a hydraulic cylinder, a hydraulic cylinder bottom plate and an upper die. The extending end of the hydraulic cylinder is provided with the hydraulic cylinder bottom plate. The hydraulic cylinder bottom plate includes an upper hydraulic cylinder bottom plate and a lower hydraulic cylinder bottom plate. The lower end of the upper hydraulic cylinder bottom plate is provided with a first chute, and the upper end of the lower hydraulic cylinder bottom plate is provided with a second chute. The first chute and the second chute form a chute area, and the upper die is arranged below the lower hydraulic cylinder bottom plate;

[0007] The cooling device includes a circular steel pipe and a plurality of cooling units. The circular steel pipe is arranged outside the hydraulic cylinder bottom plate, and the plurality of cooling units are evenly distributed on the circular steel pipe. The cooling units are used for cooling the upper die.

[0008] Further, the cooling unit includes a first steel pipe, a vertical connecting pipe, and a second steel pipe. The first steel pipe is fixedly connected to the circular steel pipe. One end of the first steel pipe extends into the chute area, and the other end of the first steel pipe is connected to the vertical connecting pipe through an upper connecting piece. The other end of the vertical connecting pipe is connected to the second steel pipe through a lower connecting piece. The second steel pipe is parallel to the first steel pipe. One end of the second steel pipe is provided with a nozzle facing the upper mold, and the other end of the second steel pipe is provided with a pipe joint that communicates with a compressed air pipe and a cooling water pipe.

[0009] Further, the first steel pipe and the upper hydraulic cylinder bottom plate are connected through a ball bearing.

[0010] Further, the upper connecting piece includes a first connecting portion and a second connecting portion. The first connecting portion and the second connecting portion are integrally formed. The first connecting portion is provided with a first through hole and a first rectangular parallelepiped groove that penetrate through the front and back. The first through hole communicates with the first rectangular parallelepiped groove. The right end of the first connecting portion is provided with a second through hole that penetrates vertically in the vertical direction. The second through hole is located on the right side of the first through hole. After one end of the first steel pipe away from the chute area extends into the first through hole, a first wing nut passes through the second through hole to fix the first steel pipe; the second connecting portion is provided with a third through hole and a second rectangular parallelepiped groove that penetrate vertically in the vertical direction. The third through hole communicates with the second rectangular parallelepiped groove. The left end of the second connecting portion is provided with a fourth through hole that penetrates through the front and back. The fourth through hole is located on the left side of the third through hole. After the upper end of the vertical connecting pipe extends into the third through hole, a second wing nut passes through the fourth through hole to fix the upper end of the vertical connecting pipe.

[0011] Further, the structure of the lower connecting piece is the same as that of the upper connecting piece. The lower connecting piece includes a third connecting portion and a fourth connecting portion. The third connecting portion and the fourth connecting portion are integrally formed. The third connecting portion is provided with a fifth through hole and a third rectangular parallelepiped groove that penetrate through the front and back. The fifth through hole communicates with the third rectangular parallelepiped groove. The right end of the third connecting portion is provided with a sixth through hole that penetrates vertically in the vertical direction. The sixth through hole is located on the right side of the fifth through hole. After one end of the second steel pipe away from the upper mold extends into the fifth through hole, a third wing nut passes through the sixth through hole to fix the second steel pipe; the fourth connecting portion is provided with a seventh through hole and a fourth rectangular parallelepiped groove that penetrate vertically in the vertical direction. The seventh through hole communicates with the fourth rectangular parallelepiped groove. The left end of the fourth connecting portion is provided with an eighth through hole that penetrates through the front and back. The eighth through hole is located on the left side of the seventh through hole. After the lower end of the vertical connecting pipe extends into the seventh through hole, a fourth wing nut passes through the eighth through hole to fix the lower end of the vertical connecting pipe.

[0012] Further, the radial distances between the first steel pipe, the second steel pipe and the hydraulic cylinder are adjusted according to the specifications of different center height rotors.

[0013] Furthermore, the second connecting part and the fourth connecting part reciprocate along the vertical connecting pipe according to the dimensions of rotors with different core lengths.

[0014] The beneficial effects achieved by the present utility model are as follows: The present utility model selects a hydraulic cylinder bottom plate, which is divided into an upper hydraulic cylinder bottom plate and a lower hydraulic cylinder bottom plate. A first chute is provided on the upper hydraulic cylinder bottom plate, and a second chute is provided on the lower hydraulic cylinder bottom plate. The first chute and the second chute form a chute area, and the existence of the chute area provides space for the installation of the cooling device, facilitating the cooling operation; Circular steel pipes, first steel pipes, vertical connecting pipes, and second steel pipes are selected, with simple structure and convenient operation. The first steel pipe is connected to the upper hydraulic cylinder bottom plate using a ball bearing, and the spray nozzles on the second steel pipe can spray and cool the upper die, improving the cooling effect of the upper die. The setting of the roller bearings enables several cooling units to be manually rotated to spray and cool the parts of the upper die, enhancing the mold cooling effect and avoiding the presence of shrinkage cavities on the end rings of the motor rotor; The upper connecting piece and the lower connecting piece can adjust the radial distance between the first steel pipe, the second steel pipe, and the hydraulic cylinder according to the specifications of rotors with different center heights, and adjust the height of the vertical connecting pipe according to the dimensions of rotors with different core lengths, thereby improving the efficiency of mold cooling.

[0015] Compared with the prior art, the present utility model has the advantages of simple structure, convenient operation, improved mold cooling effect, and no shrinkage cavities on the end rings of the motor rotor. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the present utility model after being assembled on a low-pressure casting machine;

[0017] Figure 2 is in the present utility model Figure 1 the enlarged view at A in;

[0018] Figure 3 is a top view of the cooling device of the present utility model;

[0019] Figure 4 is a front view of the cooling device of the present utility model;

[0020] Figure 5 is a schematic structural diagram of the upper connecting piece of the present utility model;

[0021] Figure 6 is a schematic structural diagram of the lower connecting piece of the present utility model.

[0022] In the figure: 1. Low-pressure casting machine; 2. Hydraulic cylinder; 3. Hydraulic cylinder bottom plate; 4. Upper mold; 5. Upper hydraulic cylinder bottom plate; 6. Lower hydraulic cylinder bottom plate; 7. First chute; 8. Second chute; 9. Chute area; 10. Circular steel pipe; 11. First steel pipe; 12. Vertical connecting pipe; 13. Second steel pipe; 14. Upper connecting piece; 15. Lower connecting piece; 16. Pipe joint; 17. Ball bearing; 18. First connecting part; 19. Second connecting part; 20. First through hole; 21. First rectangular parallelepiped groove; 22. Second through hole; 23. First wing nut; 24. Third through hole; 25. Second rectangular parallelepiped groove; 26. Fourth through hole; 27. Second wing nut; 28. Third connecting part; 29. Fourth connecting part; 30. Fifth through hole; 31. Third rectangular parallelepiped groove; 32. Sixth through hole; 33. Third wing nut; 34. Seventh through hole; 35. Fourth rectangular parallelepiped groove; 36. Eighth through hole; 37. Fourth wing nut. Detailed implementation mode

[0023] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] As Figures 1 to 5 shown, a general cooling device for a motor rotor low-pressure casting is provided on the low-pressure casting machine 1, so that the mold of the low-pressure casting machine 1 can be cooled. The low-pressure casting machine 1 includes a hydraulic cylinder 2, a hydraulic cylinder bottom plate 3 and an upper mold 4. The hydraulic cylinder 2 of the low-pressure casting machine 1 is mainly used to position the upper mold 4. A hydraulic cylinder bottom plate 3 is provided at the extending end of the hydraulic cylinder 2. The hydraulic cylinder bottom plate 3 includes an upper hydraulic cylinder bottom plate 5 and a lower hydraulic cylinder bottom plate 6. A first chute 7 is provided at the lower end of the upper hydraulic cylinder bottom plate 5, and a second chute 8 is provided at the upper end of the lower hydraulic cylinder bottom plate 6. The first chute 7 and the second chute 8 form a chute area 9. The setting of the chute area 9 provides a space for installing the cooling device and facilitates the cooling work. The upper mold 4 is provided below the lower hydraulic cylinder bottom plate 6.

[0025] The cooling device includes a circular steel pipe 10 and a plurality of cooling units. The circular steel pipe 10 is provided outside the hydraulic cylinder bottom plate 3, so as to facilitate the connection between the cooling units and the hydraulic cylinder bottom plate 3. A plurality of the cooling units are evenly distributed on the circular steel pipe 10. In this embodiment, Figures 1 - 4 as shown, there are 4 groups of cooling units, and the 4 groups of cooling units are evenly distributed on the circular steel pipe 10 in a cross shape. The cooling units are used to cool the upper mold 4.

[0026] The cooling unit includes a first steel pipe 11, a vertical connecting pipe 12, and a second steel pipe 13. The first steel pipe 11 is fixedly connected to the circular steel pipe 10, and one end of the first steel pipe 11 extends into the chute area 9, so that the cooling unit can be better connected to the low-pressure casting machine 1. The first steel pipe 11 is connected to the upper hydraulic cylinder bottom plate 5 through a ball bearing 17. The cooling unit can be manually rotated circumferentially along the chute area 9 through the ball bearing 17, and the maximum rotation angle can reach 90°. The parts of the upper die 4 can be cooled as much as possible, the cooling effect of the upper die 4 is improved, and the shrinkage cavity on the end ring of the motor rotor is avoided. The other end of the first steel pipe 11 is connected to the vertical connecting pipe 12 through an upper connecting piece 14. The other end of the vertical connecting pipe 12 is connected to the second steel pipe 13 through a lower connecting piece 15. The second steel pipe 13 is parallel to the first steel pipe 11. The circular steel pipe 10, the first steel pipe 11, the vertical connecting pipe 12, and the second steel pipe 13 have a simple structure and are convenient to operate. One end of the second steel pipe 13 is provided with a nozzle facing the upper die 4, and the other end of the second steel pipe 13 is provided with a pipe joint 16, and the pipe joint 16 communicates with the compressed air pipe and the cooling water pipe. When the motor rotor enters the pressure holding stage of the normal casting pressure curve, the pipe joint 16 is opened, and the cooling water in the water tank is squeezed into the second steel pipe 13 by the atmospheric pressure. The second steel pipe 13 sprays a mixture of compressed air and water vapor towards the upper die 4 to achieve the cooling of the upper die 4. During the pressure holding process, the cooling unit can also be manually rotated to make the cooling effect of the upper die 4 better and the cooling more uniform.

[0027] The upper connecting member 14 includes a first connecting portion 18 and a second connecting portion 19. The first connecting portion 18 and the second connecting portion 19 are integrally formed. A first through hole 20 and a first rectangular parallelepiped groove 21 penetrating through in the front and rear directions are provided on the first connecting portion 18. The first through hole 20 communicates with the first rectangular parallelepiped groove 21. The first through hole 20 is mainly used for fixing the first steel pipe 11. A second through hole 22 penetrating in the vertical direction is provided at the right end of the first connecting portion 18. The second through hole 22 is located on the right side of the first through hole 20. After one end of the first steel pipe 11 far from the chute area 9 extends into the first through hole 20, a first wing nut 23 passes through the second through hole 22 to fix the first steel pipe 11. When the first steel pipe 11 extends into the first through hole 20 and is clamped by the first wing nut 23, the diameter of the first through hole 20 decreases, thereby fixing the first steel pipe 11 more firmly. The first connecting portion 18 can reciprocally move on the first steel pipe 11 to adjust the radial distance between the first steel pipe 11 and the hydraulic cylinder 2, so as to better adapt to the specifications of rotors with different center heights. A third through hole 24 and a second rectangular parallelepiped groove 25 penetrating in the vertical direction are provided on the second connecting portion 19. The third through hole 24 communicates with the second rectangular parallelepiped groove 25. The third through hole 24 is mainly used for fixing the upper end of the vertical connecting pipe 12. A fourth through hole 26 penetrating through in the front and rear directions is provided at the left end of the second connecting portion 19. The fourth through hole 26 is located on the left side of the third through hole 24. After the upper end of the vertical connecting pipe 12 extends into the third through hole 24, a second wing nut 27 passes through the fourth through hole 26 to fix the upper end of the vertical connecting pipe 12. When the upper end of the vertical connecting pipe 12 extends into the third through hole 24 and is clamped by the second wing nut 27, the diameter of the third through hole 24 decreases, thereby fixing the upper end of the vertical connecting pipe 12 more firmly. The second connecting portion 19 reciprocally moves along the vertical connecting pipe 12 according to the sizes of rotors with different iron core lengths.

[0028] The structure of the lower connecting member 15 is the same as that of the upper connecting member 14. The lower connecting member 15 includes a third connecting portion 28 and a fourth connecting portion 29. The third connecting portion 28 and the fourth connecting portion 29 are integrally formed. A fifth through hole 30 and a third rectangular parallelepiped groove 31 that penetrate through the front and back are provided on the third connecting portion 28. The fifth through hole 30 and the third rectangular parallelepiped groove 31 are communicated. The fifth through hole 30 is mainly used to fix the second steel pipe 13. A sixth through hole 32 that penetrates in the vertical direction is provided at the right end of the third connecting portion 28. The sixth through hole 32 is located on the right side of the fifth through hole 30. After one end of the second steel pipe 13 away from the upper die 4 extends into the fifth through hole 30, a third wing nut 33 passes through the sixth through hole 32 to fix the second steel pipe 13. When the second steel pipe 13 extends into the fifth through hole 30, the diameter of the fifth through hole 30 is reduced by clamping with the third wing nut 33, so as to fix the second steel pipe 13 more firmly. The third connecting portion 28 can reciprocally move on the second steel pipe 13 to adjust the radial distance between the second steel pipe 13 and the hydraulic cylinder 2, so as to better adapt to the specifications of different center height rotors. A seventh through hole 34 and a fourth rectangular parallelepiped groove 35 that penetrate in the vertical direction are provided on the fourth connecting portion 29. The seventh through hole 34 and the fourth rectangular parallelepiped groove 35 are communicated. The seventh through hole 34 is mainly used to fix the lower end of the vertical connecting pipe 12. A front and back through eighth through hole 36 is provided at the left end of the fourth connecting portion 29. The eighth through hole 36 is located on the left side of the seventh through hole 34. After the lower end of the vertical connecting pipe 12 extends into the seventh through hole 34, a fourth wing nut 37 passes through the eighth through hole 36 to fix the lower end of the vertical connecting pipe 12. When the lower end of the vertical connecting pipe 12 extends into the seventh through hole 34, the fourth wing nut 37 can fix the lower end of the vertical connecting pipe 12 more firmly. The fourth connecting portion 29 reciprocally moves along the vertical connecting pipe 12 according to the dimensions of rotors with different core lengths.

[0029] The working process of the present utility model is as follows:

[0030] The hydraulic cylinder bottom plate 3 is set as an upper hydraulic cylinder bottom plate 5 and a lower hydraulic cylinder bottom plate 6. A first sliding groove 7 is installed at the lower end of the upper hydraulic cylinder bottom plate 5, and a second sliding groove 8 is installed at the upper end of the lower hydraulic cylinder bottom plate 6. The first sliding groove 7 and the second sliding groove 8 form a sliding groove area;

[0031] After installing the casting aluminum rotor with a certain center height on the mold, adjust the positions of the first steel pipe 11, the vertical connecting pipe 12, and the second steel pipe 13 according to the specifications of the rotor with the center height and the dimensions of the iron core length of the rotor. One end of the first steel pipe 11 away from the chute area 9 extends into the first through hole 20, and then the first wing nut 23 passes through the second through hole 22 to fix the first steel pipe 11. The upper end of the vertical connecting pipe 12 extends into the third through hole 24, and then the second wing nut 27 passes through the fourth through hole 26 to fix the upper end of the vertical connecting pipe 12. One end of the second steel pipe 13 away from the upper mold 4 extends into the fifth through hole 30, and then the third wing nut 33 passes through the sixth through hole 32 to fix the second steel pipe 13. The lower end of the vertical connecting pipe 12 extends into the seventh through hole 34, and then the fourth wing nut 37 passes through the eighth through hole 36 to fix the lower end of the vertical connecting pipe 12;

[0032] After hoisting the iron core and closing the mold, normal casting is carried out. When the pressure curve enters the pressure-holding stage, open the pipe joint 16. The cooling water in the water tank is squeezed by the atmospheric pressure and enters the second steel pipe 13. The second steel pipe 13 sprays a mixture of compressed air and water vapor towards the upper mold 4 to achieve the cooling of the upper mold 4. During the pressure-holding process, the cooling unit can also be manually rotated to make the cooling effect of the upper mold better and the cooling more uniform;

[0033] After the pressure-holding stage ends, close the pipe joint 16 and stop the cooling work.

[0034] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, the embodiments can still be changed. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A general cooling device for a motor rotor in low-pressure casting, which is arranged on a low-pressure casting machine (1), and is characterized in that: The low-pressure casting machine (1) includes a hydraulic cylinder (2), a hydraulic cylinder bottom plate (3) and an upper mold (4). The extending end of the hydraulic cylinder (2) is provided with a hydraulic cylinder bottom plate (3). The hydraulic cylinder bottom plate (3) includes an upper hydraulic cylinder bottom plate (5) and a lower hydraulic cylinder bottom plate (6). The lower end of the upper hydraulic cylinder bottom plate (5) is provided with a first chute (7), and the upper end of the lower hydraulic cylinder bottom plate (6) is provided with a second chute (8). The first chute (7) and the second chute (8) form a chute area (9). The upper mold (4) is arranged below the lower hydraulic cylinder bottom plate (6); The cooling device includes a circular steel pipe (10) and a plurality of cooling units. The circular steel pipe (10) is arranged outside the hydraulic cylinder bottom plate (3), and a plurality of the cooling units are evenly distributed on the circular steel pipe (10). The cooling units are used to cool the upper mold (4).

2. The general cooling device for low-pressure casting of an electric motor rotor according to claim 1, wherein: The cooling unit includes a first steel pipe (11), a vertical connecting pipe (12) and a second steel pipe (13). The first steel pipe (11) is fixedly connected to the circular steel pipe (10). One end of the first steel pipe (11) extends into the chute area (9). The other end of the first steel pipe (11) is connected to the vertical connecting pipe (12) through an upper connecting piece (14). The other end of the vertical connecting pipe (12) is connected to the second steel pipe (13) through a lower connecting piece (15). The second steel pipe (13) is parallel to the first steel pipe (11). One end of the second steel pipe (13) is provided with a nozzle, and the nozzle faces the upper mold (4). The other end of the second steel pipe (13) is provided with a pipe joint (16), and the pipe joint (16) communicates with a compressed air pipe and a cooling water pipe.

3. The general cooling device for low-pressure casting of an electric motor rotor according to claim 2, characterized in that: The first steel pipe (11) is connected to the upper hydraulic cylinder bottom plate (5) through a ball bearing (17).

4. A general cooling device for low-pressure casting of an electric motor rotor according to claim 3, characterized in that: The upper connecting member (14) includes a first connecting portion (18) and a second connecting portion (19). The first connecting portion (18) and the second connecting portion (19) are integrally formed. A first through hole (20) and a first rectangular parallelepiped groove (21) that penetrate through the front and back are provided on the first connecting portion (18). The first through hole (20) communicates with the first rectangular parallelepiped groove (21). A second through hole (22) that penetrates in the vertical direction is provided at the right end of the first connecting portion (18). The second through hole (22) is located on the right side of the first through hole (20). One end of the first steel pipe (11) far from the chute area (9) extends into the first through hole (20), and then a first wing nut (23) passes through the second through hole (22) to fix the first steel pipe (11). A third through hole (24) and a second rectangular parallelepiped groove (25) that penetrate in the vertical direction are provided on the second connecting portion (19). The third through hole (24) communicates with the second rectangular parallelepiped groove (25). A fourth through hole (26) that penetrates through the front and back is provided at the left end of the second connecting portion (19). The fourth through hole (26) is located on the left side of the third through hole (24). The upper end of the vertical connecting pipe (12) extends into the third through hole (24), and then a second wing nut (27) passes through the fourth through hole (26) to fix the upper end of the vertical connecting pipe (12).

5. A general cooling device for low-pressure casting of an electric motor rotor according to claim 4, characterized in that: The structure of the lower connecting member (15) is the same as that of the upper connecting member (14). The lower connecting member (15) includes a third connecting portion (28) and a fourth connecting portion (29). The third connecting portion (28) and the fourth connecting portion (29) are integrally formed. A fifth through hole (30) and a third rectangular parallelepiped groove (31) that penetrate through the front and back are provided on the third connecting portion (28). The fifth through hole (30) communicates with the third rectangular parallelepiped groove (31). A sixth through hole (32) that penetrates in the vertical direction is provided at the right end of the third connecting portion (28). The sixth through hole (32) is located on the right side of the fifth through hole (30). One end of the second steel pipe (13) far from the upper die (4) extends into the fifth through hole (30), and then a third wing nut (33) passes through the sixth through hole (32) to fix the second steel pipe (13). A seventh through hole (34) and a fourth rectangular parallelepiped groove (35) that penetrate in the vertical direction are provided on the fourth connecting portion (29). The seventh through hole (34) communicates with the fourth rectangular parallelepiped groove (35). An eighth through hole (36) that penetrates through the front and back is provided at the left end of the fourth connecting portion (29). The eighth through hole (36) is located on the left side of the seventh through hole (34). The lower end of the vertical connecting pipe (12) extends into the seventh through hole (34), and then a fourth wing nut (37) passes through the eighth through hole (36) to fix the lower end of the vertical connecting pipe (12).

6. The general cooling device for low-pressure casting of an electric motor rotor according to claim 5, characterized in that: The radial distances between the first steel pipe (11), the second steel pipe (13) and the hydraulic cylinder (2) are adjusted according to the specifications of different center height rotors.

7. A general cooling device for low-pressure casting of a motor rotor according to claim 6, characterized in that: The second connecting portion (19) and the fourth connecting portion (29) reciprocate along the vertical connecting pipe (12) according to the dimensions of different core length rotors.

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