Die-casting die for automobile motor shell

Abstract

The utility model discloses a die-casting die for an automobile motor shell, which comprises an upper die plate, a lower die plate, an upper die and a lower die, and the upper die and the lower die are arranged between the upper die plate and the lower die plate. A front sliding block assembly, a left sliding block assembly and a right sliding block assembly are arranged on the front side, the left side and the right side between the upper die plate and the lower die plate respectively, the front sliding block assembly comprises a front sliding block base and sliding block oil cylinders located on the two sides of the front sliding block base and connected with the lower die plate, and a connecting plate connected with the sliding block oil cylinders is installed at one end of the front sliding block base. The front sliding block is installed at the other end of the front sliding block base, a local pressurizing rod is arranged in the front sliding block in a penetrating mode, one end of the local pressurizing rod is connected with a pressurizing oil cylinder on the front sliding block base, and a forming protruding part is arranged at the position, close to the local pressurizing rod, of the inner side wall of the front sliding block. According to the utility model, the problems of poor forming quality of the deep concave part of the motor shell and poor cooling effect of the feeding seat can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to die casting die technical field, concretely is a kind of die casting die of automobile motor shell. BACKGROUND

[0002] As the core bearing component of motor, the structural integrity, dimensional accuracy and internal quality of automobile motor shell directly affect the assembly accuracy and running stability of motor. With the development of automobile motor towards high power and miniaturization, the structural design of motor shell becomes more and more complex, especially the inner recess structure with large depth needs to be formed on the side of the motor shell of some vehicle models to adapt to the installation requirements of internal parts of motor.

[0003] In the prior art, the die casting die for the inner recess structure on the side of the motor shell usually adopts a single slide block driving structure to realize the forming and demolding of the inner recess part. However, due to the large depth of the inner recess part, the fitting area between the slide block and the formed inner recess part is very large, so that a large pulling force needs to be applied to separate the slide block from the inner recess part during mold opening, which not only increases the driving load of the equipment, but also may cause the edge of the product inner recess part to be damaged or the slide block to be worn due to excessive pulling force, affecting the product yield and the service life of the die. At the same time, due to the large local wall thickness of the inner recess part caused by the structural design, the cooling speed of the molten material in this area is slow during the die casting process, which is easy to produce internal defects such as pores and shrinkage holes, seriously affecting the structural strength and sealing performance of the motor shell.

[0004] In addition, the feed seat of the die casting die is a key channel for molten material to enter the forming cavity, and its temperature stability directly affects the flow characteristics and filling effect of the molten material. In the prior art, the cooling structure of the feed seat is usually designed integrally with the main cooling system of the die, and the cooling path is long and not specific enough, resulting in low cooling efficiency and uneven cooling in the feed seat area. This not only causes the molten material to cool too quickly at the feed port, leading to insufficient filling, flow channel blockage and other problems, but also affects the solidification speed of the molten material in the cavity due to the high temperature of the feed seat, resulting in prolonged product forming cycle and easy occurrence of surface shrinkage, uneven internal structure and other quality defects, which is difficult to meet the high-precision production requirements of automobile motor shell.

[0005] Therefore, there is an urgent need for a die casting die for automobile motor shell that can solve the above technical problems, realize smooth demolding of deep inner recess part and avoid pore defects, and improve the cooling effect of the feed seat in a targeted manner, to ensure product quality, improve production efficiency and prolong the service life of the die. SUMMARY

[0006] The utility model provides a kind of die casting die of automobile motor shell, can solve the problem of poor forming quality of motor shell depth inner recess part and feed seat cooling effect.

[0007] To achieve the above object, the utility model provides the following technical scheme: A die -casting die of automobile motor shell, including upper mould plate, lower mould plate and set up in upper mould plate and lower mould plate's upper mould and lower mould, the middle part of upper mould is provided with center forming assembly, the front side, left side and right side between upper mould plate and lower mould plate are provided with front slider assembly, left slider assembly and right slider assembly respectively, the front slider in front slider assembly, left slider in left slider assembly and right slider in right slider assembly form a forming mould cavity together with center forming assembly, the rear side between upper mould plate and lower mould plate is provided with feeding seat, the feeding port of feeding seat is linked with forming mould cavity, front slider assembly includes front slider seat and slider oil cylinder which is located on both sides of front slider seat and is connected with lower mould plate, one end of front slider seat is installed with the connecting plate which is connected with slider oil cylinder, the other end of front slider seat is installed with front slider, and partial pressurizing rod is arranged in front slider, one end of partial pressurizing rod is connected with pressurizing oil cylinder on front slider seat, the position of the inner side wall of front slider close to partial pressurizing rod is provided with forming convex part, the forming mould cavity is formed by front slider assembly, left slider assembly, right slider assembly and center forming assembly, the overall structure of automobile motor shell is accurately matched, especially the setting of front slider assembly is specially adapted to the forming requirement of the side depth inner recess part, and accurate cavity basis is provided for the inner recess part forming. Front slider assembly adopts double oil cylinder design, and the two slider oil cylinders are specially used for driving the overall movement of front slider to realize demolding. Compared with the existing single driving structure, the driving force can be reasonably distributed to ensure sufficient demolding force and avoid product collapse and mold wear; the pressurizing oil cylinder cooperates with the partial pressurizing rod, which can perform targeted partial pressurization on the thick wall area of the inner recess part corresponding to the inner side forming convex part of the front slider during the die -casting process, compact the internal gap of the melt, and fundamentally solve the technical problem that the inner recess part is easy to produce pores due to thick wall.

[0008] As preferred, the pressurizing oil cylinder is installed on the connecting plate, the extension rod of the pressurizing oil cylinder is connected with one end of the partial pressurizing rod through the long connecting rod, the extension rod of the pressurizing oil cylinder is connected with the partial pressurizing rod in the axial direction through the long connecting rod, the driving force of the pressurizing oil cylinder can be accurately transmitted, the pressurizing force of the partial pressurizing rod on the thick wall inner recess part is stable and uniform, the effect of partial pressurization is further improved, and the design of the long connecting rod adapts to the installation distance of the front slider seat and the front slider, which provides reasonable space adaptation for the structure layout.

[0009] As preferred, the center forming assembly comprises an outer forming sleeve and an inner forming column arranged concentrically, and the inner forming column is internally provided with a cooling flow channel; the layered forming design ensures the dimensional accuracy and structural consistency of the center part, reduces the processing difficulty of the center forming assembly, and the cooling flow channel in the inner forming column can be used to cool the center area of the motor shell, accelerate the solidification speed of the molten material in the center part, and avoid the deformation caused by the cooling lag in the center area.

[0010] As preferred, the feeding port is arranged between the left slider and the right slider and penetrates from the bottom of the forming cavity; the feeding port is arranged between the left slider and the right slider and penetrates from the bottom of the forming cavity, and the bottom feeding mode is adopted, so that the molten material is gradually filled from the bottom of the cavity upward, which can effectively discharge the air in the cavity and reduce the air entrapment phenomenon during the filling process. At the same time, the feeding position is located between the left and right sliders, so that the molten material can uniformly diffuse to the front, left and right directions of the cavity, avoiding the formation defects caused by too fast or too slow filling speed in local area, especially cooperating with the inner recess forming of the front slider, ensuring sufficient supply of molten material in the inner recess area, and improving the overall forming quality of the product.

[0011] As preferred, the upper side of the front slider seat is provided with a pressing block, and the local pressure rod penetrates through the pressing block transversely; the pressing block forms a transverse guide and limiting action on the local pressure rod, which can limit the up-down deviation of the local pressure rod during reciprocating motion, and ensure the relative position accuracy of the axis of the pressure rod and the forming protrusion.

[0012] As preferred, the inside of the front slider is provided with a guide sleeve arranged outside the local pressure rod, and a distance is left between the end of the guide sleeve and the inside sidewall of the front slider; the guide sleeve further strengthens the guiding effect of the local pressure rod, reduces the radial shaking of the local pressure rod during motion, reduces the friction loss between the rod body and the inner wall of the front slider, and improves the motion stability. The distance between the end of the guide sleeve and the inside sidewall of the front slider avoids the interference between the guide sleeve and the forming protrusion, ensures the forming space of the inner recess, and at the same time, reserves sufficient space for the filling of the molten material to the inner recess area, without affecting the compaction effect of the local pressure rod on the molten material.

[0013] As preferred, the feeding seat is embedded in the groove arranged on the upper side of the lower die plate, a cooling column extending into the feeding seat is arranged in the groove, a cooling inner cavity is formed between the cooling column and the feeding seat, the cooling column in the groove and the feeding seat form an independent cooling inner cavity, a special cooling structure for the feeding seat is constructed, the cooling is more targeted compared with the existing integrated cooling system, the core area of the feeding seat can be directly cooled, and the problem of insufficient cooling of the feeding seat in the prior art is effectively solved. Meanwhile, the design of the cooling inner cavity increases the contact area of the cooling liquid and the feeding seat, improves the cooling uniformity, and avoids local high or low temperature of the feeding seat.

[0014] As preferred, the inside of the feeding seat is provided with a cooling liquid inlet flow channel and a cooling liquid outlet flow channel on both sides of the cooling column respectively, the cooling liquid inlet flow channel is connected with a cooling liquid inlet pipe, the cooling liquid outlet flow channel is connected with a cooling liquid outlet pipe, the outside of the cooling column is provided with an annular flow channel corresponding to the cooling liquid inlet flow channel, the center of the cooling column is provided with a vertical flow channel communicating with the top, and the bottom of the vertical flow channel is connected with the annular flow channel through a horizontal flow channel. The cooling liquid inlet flow channel, the cooling liquid outlet flow channel, the cooling liquid inlet pipe and the cooling liquid outlet pipe cooperatively construct a complete cooling liquid circulation channel, so that the cooling liquid can continuously and stably flow into the cooling structure, and efficient heat dissipation is realized; the annular flow channel on the outside of the cooling column, the vertical flow channel in the center and the horizontal flow channel at the bottom form a three-dimensional cooling flow channel network, so that the cooling liquid can fully cover the inside of the cooling column and the feeding seat, not only the uniform cooling of the feeding seat is realized, but also the molten material in the feeding channel can be indirectly cooled through the cooling column, so that the molten material is prevented from being cooled too fast or too slow.

[0015] Compared with the prior art, the utility model has the advantages of:

[0016] The rational structure cooperates the front slider block assembly, the left slider block assembly, the right slider block assembly and the center forming assembly to form a forming die cavity, accurately matches the overall structure of the automobile motor shell, especially the front slider block assembly is specially arranged to adapt to the forming requirement of the side deep concave part, and provides an accurate cavity basis for the concave part forming. The front slider block assembly adopts a double-oil-cylinder design, two slider block oil cylinders are specially used for driving the front slider to move integrally to realize demolding, compared with the existing single driving structure, the driving force can be reasonably distributed to ensure sufficient demolding force and avoid product collapse and mold wear; the pressurizing oil cylinder cooperates with the local pressurizing rod to perform targeted local pressurization on the thick wall area of the inner concave part corresponding to the inner side forming convex part of the front slider during the die casting process, and compacts the internal gap of the molten material, thereby fundamentally solving the technical problem that the inner concave part is easy to produce pores due to large wall thickness. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a three-dimensional structure diagram of the utility model;

[0018] Figure 2 is a side view of the utility model;

[0019] Figure 3 is Figure 2 an enlarged structural view of A;

[0020] Figure 4 is a first perspective view of the utility model;

[0021] Figure 5 is Figure 4 an enlarged structural view of B;

[0022] Figure 6 is a second perspective view of the utility model;

[0023] Figure 7 is Figure 6 an enlarged structural view of C;

[0024] Figure 8 is a partial sectional view of the utility model.

[0025] Reference signs:

[0026] 1, upper die plate, 11, pressing block, 12, inner layer forming column, 13, outer layer forming sleeve, 14, forming cavity, 2, lower die plate, 3, front slider assembly, 31, front slider seat, 32, front slider, 33, partial pressure rod, 34, long connecting rod, 35, forming convex part, 36, slider oil cylinder, 37, connecting plate, 38, pressure oil cylinder, 39, guide sleeve, 4, upper die, 5, feeding seat, 51, cooling inner cavity, 52, cooling liquid inlet channel, 53, cooling liquid inlet pipe, 54, cooling liquid outlet pipe, 55, cooling liquid outlet channel, 6, cooling column, 61, vertical channel, 62, annular channel, 63, horizontal channel, 7, lower die, 8, right slider assembly, 81, right slider, 9, left slider assembly, 91, left slider, 10, feeding port. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0028] As Figures 1-8As shown, the utility model discloses to solve the poor forming quality of the deep inner recess of motor casing, the feeding seat cooling effect problem provides the following technical scheme: A kind of die casting die of automobile motor casing, including upper die plate 1, lower die plate 2 and the upper die 4 and lower die 7 being arranged between upper die plate 1 and lower die plate 2, the middle part of the upper die 4 is provided with center forming assembly, the front side, left side and right side between the upper die plate 1 and lower die plate 2 are provided with front slider assembly 3, left slider assembly 9 and right slider assembly 8 respectively, the front slider 32 in the front slider assembly 3, left slider 91 in left slider assembly 9 and right slider 81 in right slider assembly 8 form forming die cavity 14 together with center forming assembly, the rear side between the upper die plate 1 and lower die plate 2 is provided with feeding seat 5, the feeding port 10 of the feeding seat 5 is communicated with forming die cavity 14, the front slider assembly 3 includes front slider seat 31 and the slider oil cylinder 36 being located at the both sides of front slider seat 31 and being connected with lower die plate 2, one end of the front slider seat 31 is equipped with the connecting plate 37 being connected with slider oil cylinder 36, the front slider 32 is installed at the other end of front slider seat 31, and partial pressurizing rod 33 is arranged in the front slider 32, one end of the partial pressurizing rod 33 is connected with the pressurizing oil cylinder 38 on the front slider seat 31, the inner side wall of the front slider 32 is provided with forming convex part 35 at the position close to partial pressurizing rod 33, forming die cavity is formed by front slider assembly 3, left slider assembly 9, right slider assembly 8 and center forming assembly, and the overall structure of automobile motor casing is accurately matched, especially the setting of front slider assembly 3 is specially adapted to the forming requirement of side depth inner recess, and accurate cavity basis is provided for inner recess forming. Front slider assembly 3 adopts double oil cylinder design, and two slider oil cylinders 36 are specially used to drive the overall movement of front slider to realize demolding. Compared with the existing single driving structure, the driving force can be reasonably distributed to ensure sufficient demolding force and avoid product collapse and mold wear. The pressurizing oil cylinder 38 cooperates with the partial pressurizing rod 33 to press the thick-walled area of the inner recess corresponding to the inner side forming convex part of the front slider during the die casting process, compact the internal voids of the melt, and solve the technical problem of easy porosity of the inner recess due to large wall thickness from the root.

[0029] As preferred, the pressurizing oil cylinder 38 is installed on the connecting plate 37, the extension rod of the pressurizing oil cylinder 38 is connected with one end of the partial pressurizing rod 33 through the long connecting rod 34, the extension rod of the pressurizing oil cylinder 38 is connected with the partial pressurizing rod 33 in the axial direction through the long connecting rod 34, the driving force of the pressurizing oil cylinder can be accurately transmitted, the pressurizing force of the partial pressurizing rod 33 on the thick-walled inner recess is stable and uniform, the effect of local pressurization is further improved, and the design of the long connecting rod adapts to the installation distance of the front slider seat and the front slider, providing reasonable space adaptation for structural layout.

[0030] As preferred, the center forming assembly comprises an outer forming sleeve 13 and an inner forming column 12 arranged concentrically, and the inner forming column 12 is internally provided with a cooling flow channel, the layered forming design ensures the dimensional accuracy and structural consistency of the center part, reduces the processing difficulty of the center forming assembly, and the inner forming column 12 is internally provided with a cooling flow channel, which can be used to cool the center area of the motor shell and accelerate the solidification speed of the molten material in the center part, thereby avoiding the deformation caused by the lagging cooling of the center area.

[0031] As preferred, the feeding port 10 is arranged between the left slider 91 and the right slider 81 and penetrates from the bottom of the forming cavity 14, the feeding port 10 is arranged between the left slider 91 and the right slider 81 and penetrates from the bottom of the forming cavity 14, and the bottom feeding mode is adopted, so that the molten material is gradually filled from the bottom of the cavity upward, which can effectively discharge the air in the cavity and reduce the air entrapment phenomenon during the filling process of the molten material. At the same time, the feeding position is located between the left and right sliders, so that the molten material can be uniformly diffused to the front, left and right directions of the cavity, thereby avoiding the forming defects caused by the too fast or too slow filling speed in the local area, and especially cooperating with the inner recess forming of the front slider, the molten material in the inner recess area can be sufficiently supplied, thereby improving the overall forming quality of the product.

[0032] As preferred, the upper side of the front slider seat 31 is provided with a pressing block 11, and the local pressing rod 33 penetrates through the pressing block 11 transversely, the pressing block 11 forms a transverse guide and limiting action on the local pressing rod 33, which can limit the up-down deviation of the local pressing rod during the reciprocating motion, and ensure the relative position accuracy of the axis of the pressing rod and the forming protrusion 35.

[0033] As preferred, the inner side of the front slider 32 is provided with a guide sleeve 39 sleeved on the outer side of the local pressing rod 33, and the end of the guide sleeve 39 is spaced apart from the inner side wall of the front slider 32, the guide sleeve 39 further strengthens the guiding effect of the local pressing rod 33, reduces the radial shaking of the local pressing rod 33 during the movement, reduces the friction loss between the rod body and the inner wall of the front slider, and improves the movement stability. The distance between the end of the guide sleeve 39 and the inner side wall of the front slider 32 can avoid the interference between the guide sleeve and the forming protrusion, ensure that the forming space of the inner recess is not affected, and at the same time, it can provide sufficient space for the molten material to fill the inner recess area, and does not affect the compaction effect of the local pressing rod on the molten material.

[0034] As preferred, the feeding seat 5 is embedded in a groove provided on the upper side of the lower die plate 2, a cooling column 6 extending into the feeding seat 5 is provided in the groove, and a cooling inner cavity 51 is formed between the cooling column 6 and the feeding seat 5, the cooling column 6 in the groove and the feeding seat 5 form independent cooling inner cavities, a dedicated cooling structure for the feeding seat is constructed, the cooling is more targeted compared with the existing integrated cooling system, the core area of the feeding seat can be directly cooled, and the problem of insufficient cooling of the feeding seat in the prior art is effectively solved. Meanwhile, the design of the cooling inner cavity 51 increases the contact area of the cooling liquid and the feeding seat 5, improves the cooling uniformity, and avoids local high or low temperature of the feeding seat.

[0035] As preferred, the inside of the feeding seat 5 is provided with a cooling liquid inlet flow channel 52 and a cooling liquid outlet flow channel 55 on both sides of the cooling column 6, the cooling liquid inlet flow channel 52 is connected with a cooling liquid inlet pipe 53, the cooling liquid outlet flow channel 55 is connected with a cooling liquid outlet pipe 54, the outside of the cooling column 6 is provided with an annular flow channel 62 corresponding to the cooling liquid inlet flow channel 52, the center of the cooling column 6 is provided with a vertical flow channel 61 communicating with the top, and the bottom of the vertical flow channel 61 is connected with the annular flow channel 62 through a horizontal flow channel 63. The cooling liquid inlet flow channel 52, the cooling liquid outlet flow channel 55, the cooling liquid inlet pipe 53 and the cooling liquid outlet pipe 54 cooperatively construct a complete cooling liquid circulation channel, so that the cooling liquid can continuously and stably flow into the cooling structure, and efficient heat dissipation is realized; the annular flow channel 62 on the outside of the cooling column 6, the vertical flow channel 61 in the center and the horizontal flow channel 63 at the bottom form a three-dimensional cooling flow channel network, so that the cooling liquid can comprehensively cover the inside of the cooling column and the feeding seat, not only the uniform cooling of the feeding seat is realized, but also the molten material in the feeding channel is indirectly cooled through the cooling column, so that the molten material is prevented from being cooled too fast or too slow.

[0036] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.

[0037] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0038] In the utility model, unless another definite provision and limitation, the term "connect", "fix" and so on should do the broad sense understanding, for example, "fix" can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two element inside's intercommunication or two element's mutual action relation, unless another definite limitation.For the ordinary skill in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to the specific circumstances.

[0039] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the present application.

Claims

1. A die-casting mold for an automobile motor housing, comprising an upper mold plate (1), a lower mold plate (2), and an upper mold (4) and a lower mold (7) provided between the upper mold plate (1) and the lower mold plate (2), characterized in that, The upper die (4) is provided with a center forming assembly, the front side, left side and right side between the upper die plate (1) and the lower die plate (2) are respectively provided with a front slider assembly (3), a left slider assembly (9) and a right slider assembly (8), the front slider (32) in the front slider assembly (3), the left slider (91) in the left slider assembly (9) and the right slider (81) in the right slider assembly (8) together with the center forming assembly enclose a forming cavity (14), the rear side between the upper die plate (1) and the lower die plate (2) is provided with a feeding seat (5), the feeding port (10) of the feeding seat (5) is communicated with the forming cavity (14), the front slider assembly (3) comprises a front slider seat (31) and a slider oil cylinder (36) connected with the lower die plate (2) on both sides of the front slider seat (31), one end of the front slider seat (31) is provided with a connecting plate (37) connected with the slider oil cylinder (36), the front slider (32) is installed at the other end of the front slider seat (31), and a local pressure rod (33) is arranged in the front slider (32), one end of the local pressure rod (33) is connected with a pressure oil cylinder (38) on the front slider seat (31), and a forming convex part (35) is arranged on the inner side wall of the front slider (32) close to the local pressure rod (33).

2. The die casting mold for an automobile motor case according to claim 1, characterized by: The pressure oil cylinder (38) is installed on the connecting plate (37), and the extending rod of the pressure oil cylinder (38) is connected with one end of the local pressure rod (33) in the axial direction through a long connecting rod (34).

3. The die casting mold for an automobile motor case according to claim 1, characterized by: The center forming assembly comprises an outer forming sleeve (13) and an inner forming column (12) arranged concentrically, and the inner forming column (12) is provided with a cooling flow channel in the inside.

4. The die casting mold for an automobile motor case according to claim 1, characterized by: The feeding port (10) is arranged between the left slider (91) and the right slider (81) and penetrates out from the bottom of the forming cavity (14).

5. The die casting mold for an automobile motor case according to claim 2, characterized by: The upper side of the front slider seat (31) is provided with a pressing block (11), and the local pressure rod (33) penetrates through the pressing block (11) in the transverse direction.

6. The die casting mold for an automobile motor case according to claim 2, characterized by: The inside of the front slider (32) is provided with a guide sleeve (39) sleeved outside the local pressure rod (33), and a distance is left between the end of the guide sleeve (39) and the inner side wall of the front slider (32).

7. The die casting mold for an automobile motor case according to claim 1, characterized by: The feeding seat (5) is embedded in a groove on the upper side of the lower die plate (2), the groove is provided with a cooling column (6) extending into the inside of the feeding seat (5), and a cooling inner cavity (51) is formed between the cooling column (6) and the feeding seat (5).

8. The die casting mold for an automotive electric machine housing according to claim 7, characterized by: The inside of the feeding seat (5) is provided with a cooling liquid inlet flow channel (52) and a cooling liquid outlet flow channel (55) on both sides of the cooling column (6), the cooling liquid inlet flow channel (52) is connected with a cooling liquid inlet pipe (53), the cooling liquid outlet flow channel (55) is connected with a cooling liquid outlet pipe (54), the outside of the cooling column (6) is provided with an annular flow channel (62) corresponding to the cooling liquid inlet flow channel (52), the center of the cooling column (6) is provided with a vertical flow channel (61) communicating with the top, and the bottom of the vertical flow channel (61) is connected with the annular flow channel (62) through a horizontal flow channel (63).

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