Cooling device for foam packaging box forming

Abstract

A cooling device for foam packaging box forming comprises a rack, a core mold assembly and a bottom mold assembly, the core mold assembly and the bottom mold assembly are arranged in the rack correspondingly, the bottom mold assembly is provided with a partition assembly and a third cooling assembly, and the partition assembly is arranged on the front side of the third cooling assembly; the third cooling assembly is provided with a plurality of water distribution pipes, each water distribution pipe is provided with a plurality of spray heads, the multiple spray heads are distributed in an array mode in the vertical direction of the water distribution pipes, and the spray heads are configured to spray cooling water flow to the partition assembly and the foam box bottom plate; the bottom die assembly is provided with cooling bins and sliding grooves, the cooling bins are connected with the sliding grooves, the water distribution pipes are arranged in the multiple cooling bins, and the partition assembly is in sliding connection with the sliding grooves. When injection molding operation is carried out, the spray head sprays cooling water flow to the partition assembly at first, the baffle is effectively cooled in time, and then primary cooling treatment on the injection molding foam box is achieved. And then, after injection molding is completed, the partition assembly is moved away, the spray head sprays cooling water flow to the bottom plate of the foam box, and final cooling treatment is conducted on the bottom plate of the foam box.

Description

Technical Field

[0001] The invention relates to the field of packaging box molding production, in particular to a cooling device for foam packaging box molding. Background Art

[0002] Foam packaging boxes are widely used in logistics, transportation, food preservation and other fields due to their good heat insulation, shockproof and waterproof properties. The injection molding process is a delicate and multi-step process that ensures the high quality and production efficiency of the product. When the foam packaging box is molded in one piece, the temperature is often high and it is not easy to remove. At present, most of them use water cooling or air cooling to cool the mold and the finished product inside.

[0003] However, the bottom of the foam packaging box is usually thicker than the side wall. This structural feature causes the bottom cooling time to be relatively long during the cooling process, causing the side wall to shrink and deform, which greatly affects the production quality of the foam packaging box. On the other hand, if the cooling time is too short, the foam at the bottom may not be fully formed, and the demoulding process cannot be completed smoothly. Both situations have a serious impact on the production quality of the foam packaging box. Summary of the invention

[0004] In order to overcome some of the problems mentioned in the above background, the present invention provides a cooling device for forming a foam packaging box.

[0005] The technical solution adopted by the present invention is as follows: A cooling device for foam packaging box molding, comprising a frame, a core mold assembly and a bottom mold assembly arranged in the frame, the core mold assembly is arranged corresponding to the bottom mold assembly, the bottom mold assembly is provided with a barrier assembly and a third cooling assembly, the barrier assembly is arranged at the front side of the third cooling assembly; The third cooling assembly is provided with a plurality of water distribution pipes, the water distribution pipes are provided with a plurality of nozzles, the plurality of nozzles are vertically distributed in an array along the water distribution pipes, and the nozzles are configured to spray cooling water flow toward the barrier assembly and the bottom plate of the foam box; The bottom mold assembly is provided with a cooling bin and a chute, the cooling bin is connected to the chute, the water distribution pipe is arranged in a plurality of the cooling bins, and the barrier assembly is slidably connected to the chute.

[0006] Further, the bottom mold assembly also includes a bottom mold shell, a plurality of second through holes, a plurality of mold cavities and a plurality of second cooling channels, the plurality of second through holes are connected to a plurality of water distribution pipes in a one-to-one correspondence, and the second through holes are connected to the water distribution pipes; The slide groove is arranged at the front side of the second through hole, the plurality of mold cavities are arranged in the bottom mold shell, the second cooling channel is arranged at the outside of the mold cavity, and the second cooling channel is configured to be connected to the second cooling assembly; Positioning holes are arranged between the plurality of mold cavities.

[0007] Furthermore, the bottom mold shell is provided with a cover plate and a plurality of push rods, the cooling bin is provided between the cover plate and the mold cavity, a guide plate is provided at the lower part of the cooling bin, a water collecting trough is provided in the guide plate, and the water collecting trough is connected to the cooling bin; A plurality of push rods are slidably connected to the cover plate, and the push rods are connected to the barrier assembly. The four corners of the mold cavity are respectively provided with the push rods, and the push rods are used to press the barrier assembly and push out the formed foam box; The bottom mold shell is also provided with a plurality of fourth through holes.

[0008] Further, the core mold assembly includes an upper fixing plate, a plurality of first cooling channels and a plurality of core modules, one side of the upper fixing plate is provided with two connecting sleeves and a plurality of first through holes, the two connecting sleeves are respectively arranged on the sides of the upper fixing plate, the connecting sleeves are provided with internal threads, and the plurality of first through holes are arranged one by one with the plurality of fourth through holes; The core module is arranged on the other side of the upper fixing plate, a plurality of the first cooling channels are arranged in the upper fixing plate and the core module, and the first cooling channels are used to connect the first cooling assembly; Positioning posts are arranged between the core modules, and the positioning posts are arranged corresponding to the positioning holes.

[0009] Furthermore, the barrier assembly includes a baffle, a limit block and a lifting ear, the limit block is fixedly connected to the side of the baffle, the lifting ear is fixedly connected to the top of the baffle, and the baffle is slidably connected to the slide groove.

[0010] Further, the frame is provided with a front vertical frame and a rear vertical frame, the front vertical frame is provided with a plurality of polished rods and a plurality of screw rods, the plurality of polished rods are arranged in one-to-one correspondence with the plurality of first through holes, the polished rods are slidably connected with the first through holes, the top end of the polished rods is fixedly connected with the fourth through holes, the screw rods are transmission-connected with the connecting sleeve, the screw rods are connected with the driving motor, and the driving motor drives the screw rods to rotate; The rear frame is fixedly connected to the fixed end of the push rod.

[0011] Furthermore, the first cooling component is provided with a first water inlet pipe, a plurality of cooling pipes and a plurality of water outlet pipes, the first water inlet pipe is respectively connected to the cooling pipes, the water outlet pipes are connected to the cooling pipes, the cooling pipes are arranged in the first cooling channel, and the cooling pipes are made of a material with good thermal conductivity.

[0012] Furthermore, the third cooling assembly is also provided with a third water inlet pipe, and the third water inlet pipe is connected to the water distribution pipe.

[0013] Compared with the prior art, the present invention has the following beneficial effects: During the injection molding operation, the nozzle will first spray cooling water to the baffle assembly to cool the baffle in a timely and effective manner, thereby achieving the initial cooling of the injection molded foam box. Afterwards, after the injection molding is completed, the baffle assembly is removed, and the nozzle sprays cooling water to the bottom plate of the foam box to finally cool the bottom plate of the foam box. Through this design, the cooling efficiency of the bottom plate of the foam box is improved, and the quality of the finished packaging box can also be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of a cooling device for forming a foam packaging box according to an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the midsole mold assembly; Figure 3 for Figure 2 A schematic top view of the midsole mold assembly; Figure 4 for Figure 3 AA section diagram along the middle; Figure 5 for Figure 3 BB cross-sectional view of the middle edge; Figure 6 for Figure 1 Schematic diagram of the middle partition assembly; Figure 7 for Figure 1 Schematic diagram of the first cooling assembly, the second cooling assembly and the third cooling assembly; Figure 8 for Figure 1 A schematic diagram of the front view of the core mold assembly; Fig. 9 for Figure 8 Schematic diagram of the CC section along the middle edge.

[0015] In the figure: 1. Frame; 11. Drive motor; 12. Front frame; 13. Polished rod; 14. Screw rod; 15. Rear frame; 2. First cooling assembly; 21. First water inlet pipe; 22. Cooling pipe; 23. Water outlet pipe; 3. Core mold assembly; 31. Upper fixing plate; 32. Connecting sleeve; 33. First through hole; 34. First cooling channel; 35. Positioning column; 36. Core module; 4. Bottom mold assembly; 41. Bottom mold shell ; 42. slide groove; 43. second through hole; 44. push rod; 45. guide plate; 46. positioning hole; 47. mold cavity; 48. fourth through hole; 49. second cooling channel; 411. cover plate; 451. water collecting trough; 5. barrier assembly; 51. baffle; 52. limit block; 53. hook; 6. second cooling assembly; 7. third cooling assembly; 71. third water inlet pipe; 72. water distribution pipe; 73. nozzle. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] Foam packaging boxes are widely used in logistics and food preservation industries due to their excellent heat insulation, shockproof and waterproof properties. The injection molding process is a delicate and complex multi-step process that ensures high product quality and production efficiency. During the one-piece molding process of foam packaging boxes, the product is not easy to remove from the mold due to the high temperature. At present, water cooling or air cooling is generally used to cool the mold and the finished product inside.

[0018] However, the structural characteristics of the foam packaging box, especially the design that the bottom is thicker than the side walls, poses significant challenges to the cooling process. Specifically, this structural feature causes the bottom to take a relatively long time to cool, which may cause the side walls to shrink and deform due to uneven cooling, posing a serious threat to the production quality of the foam packaging box. On the other hand, if the cooling time is too short, the foam material at the bottom may not be fully solidified and formed, which will affect the smooth progress of the demolding process and also have an adverse effect on product quality. Therefore, the present invention provides a cooling device for foam packaging box molding, aiming to improve product quality and production efficiency.

[0019] like Figure 1 , Figure 2 , Figure 3 and Figure 7 As shown, in some embodiments, a cooling device for foam packaging box molding includes a frame 1, a core mold assembly 3 and a bottom mold assembly 4, the core mold assembly 3 and the bottom mold assembly 4 are installed in the frame 1, the frame 1 provides support for the core mold assembly 3 and the bottom mold assembly 4, and provides space for the movement of the core mold assembly 3.

[0020] The bottom mold assembly 4 and the core mold assembly 3 cooperate to form an injection molding cavity, and the foam packaging box is injection molded in the cavity.

[0021] The bottom mold assembly 4 is provided with a cooling bin and a chute 42, and the barrier assembly 5 slides up and down in the chute 42. The chute 42 is arranged at the top of the cooling bin and communicates with the cooling bin.

[0022] Particularly, in the bottom mold assembly 4 , the barrier assembly 5 and the third cooling assembly 7 are arranged in parallel, wherein the barrier assembly 5 is arranged in front of the third cooling assembly 7 .

[0023] The third cooling assembly 7 is provided with a plurality of water distribution pipes 72 , and the water distribution pipes 72 are arranged in a plurality of cooling bins, and the barrier assembly 5 is slidably connected to the slide groove 42 .

[0024] Each water distribution pipe 72 is provided with a plurality of nozzles 73 , and these nozzles 73 form an array in the vertical direction of the water distribution pipe 72 .

[0025] The barrier assembly 5 blocks the rear side of the mold cavity 47 in the bottom mold assembly 4, and the push rod 44 then holds the barrier assembly 5 in place, so that the injection molding cavity formed between the mold cavity 47 and the core mold assembly 3 is in a sealed state to ensure that the size of the molded foam box is uniform.

[0026] It is worth noting that during the injection molding operation, the nozzle 73 will first spray cooling water toward the barrier assembly 5 to promptly and effectively cool the baffle 51. Afterwards, after the barrier assembly 5 is removed, the nozzle 73 sprays cooling water toward the bottom plate of the foam box to quickly cool the bottom plate of the foam box. This design can improve the cooling efficiency of the bottom plate of the foam box and effectively improve the quality of the finished packaging box.

[0027] like Figure 2-Figure 5 As shown, in some embodiments, the bottom mold assembly 4 further includes a bottom mold shell 41, a plurality of second through holes 43, a plurality of mold cavities 47, and a plurality of second cooling channels 49. First, these second through holes 43 correspond to a plurality of water distribution pipes 72, and are connected one by one to ensure smooth connection between the bottom mold shell 41 and the water distribution pipes 72.

[0028] Secondly, the slide groove 42 is arranged at the front side of the second through hole 43 so that when the foam packaging box is being injected, the nozzle 73 can spray cooling water to the baffle 51 to ensure that the temperature of the baffle 51 is stable.

[0029] Finally, a plurality of mold cavities 47 are provided on the side where the bottom mold shell 41 is connected to the core mold assembly 3. The mold cavities 47 extend toward the interior of the bottom mold shell 41. A plurality of second cooling channels 49 are provided on the outer wall close to each mold cavity 47. The second cooling assembly 6 is installed in the second cooling channel. By injecting cooling water into the second cooling assembly 6, the cooling treatment of the mold cavity 47 is completed.

[0030] It should also be noted that positioning holes 46 are provided between the plurality of mold cavities 47. Through the positioning holes 46, the core mold assembly 3 and the bottom mold assembly 4 can ensure the accuracy of the mold position when the mold is closed, thereby ensuring that the molded foam packaging box has accurate size and stable quality.

[0031] It is worth mentioning that cooling the mold cavity 47 by the second cooling assembly 6 can reduce the corrosion of the cooling channel of the bottom mold shell 41 by the cooling water used for a long time, thereby reducing the damage to the entire bottom mold assembly 4. Therefore, adopting this design can improve the service life of the bottom mold shell 41.

[0032] Furthermore, in some embodiments, the bottom mold shell 41 is provided with a cover plate 411 and a plurality of push rods 44, and a cooling chamber is provided between the cover plate 411 and the mold cavity 47. Such a design is intended to provide effective cooling during the foam box molding process.

[0033] The lower part of the cooling bin is designed with a guide plate 45, and a water collecting tank 451 is also provided inside the guide plate 45. The water collecting tank 451 is connected to the cooling bin, and such a design can effectively collect and discharge cooling water during the cooling process. It should be noted that the guide plate 45 is designed to be inclined so that the cooling water can flow out of the cooling bin smoothly.

[0034] A plurality of push rods 44 are arranged on the rear side of the bottom mold shell 41, and the push rods 44 are slidably connected to the cover plate 411, and the push rods 44 are respectively arranged at the four corners of the mold cavity 47. Such a structure enables the push rods 44 to be used not only to press the barrier assembly 5, but also to push out the molded foam box, thereby improving the efficiency of the entire molding process.

[0035] In addition, the bottom mold shell 41 is also provided with a plurality of fourth through holes 48, which are fixedly connected to the top ends of the polished rods 13. The design of these through holes can make the bottom mold shell 41 fit more closely with the core mold assembly 3.

[0036] like Figure 8-Figure 9 As shown, in some embodiments, the core mold assembly 3 includes an upper fixed plate 31, a plurality of first cooling channels 34 and a plurality of core modules 36. Two connecting sleeves 32 and a plurality of first through holes 33 are provided on one side of the upper fixed plate 31, and the two connecting sleeves 32 are respectively arranged at the side parts of the upper fixed plate 31, and are symmetrically arranged along the vertical center line of the upper fixed plate 31. The connecting sleeve 32 is provided with an internal thread, which is connected to the screw rod 14 through the thread. The plurality of first through holes 33 and the plurality of fourth through holes 48 are arranged one by one, and are used to connect with the light rod 13, and play a guiding role in the process of moving the core mold assembly 3.

[0037] Multiple core modules 36 are arranged on the other side of the upper fixing plate 31, and are arranged one by one with multiple mold cavities 47, and are used to cooperate with the mold cavities 47 to form a foam injection space. In the internal space of the upper fixing plate 31 and the core module 36, multiple first cooling channels 34 are cleverly designed. The main function of these channels is to connect to the first cooling assembly 2, so as to achieve the purpose of rapid cooling and solidification of the foam material, and ensure the quality and efficiency of the foam packaging box molding.

[0038] In addition, positioning posts 35 are provided between the core modules 36 , and the positioning posts 35 are provided corresponding to the positioning holes 46 , so as to ensure the accuracy of the fit between the core modules 36 and the mold cavity 47 when the mold is closed.

[0039] It is worth mentioning that the first cooling assembly 2 designed here cools the core module 36, which also reduces the corrosion of the cooling channel of the core module 36 by the cooling water used for a long time, thereby causing damage to the core module 36. Therefore, adopting this design, the service life of the core module 36 can be improved.

[0040] like Figure 6 As shown, in some embodiments, the barrier assembly 5 includes a baffle 51, a stopper 52 and a lifting lug 53. The stopper 52 is welded and fixed to the top side of the baffle 51. The stopper 52 limits the position of the baffle 51 in the cooling bin to prevent the baffle 51 from being too low and affecting the drainage work of the water collecting tank 451. The lifting lug 53 is welded and fixed to the top of the baffle 51 to form a stable whole. The baffle 51 is moved up and down along the slide 42 by connecting the external driving component with the lifting lug 53 so as to flexibly adjust its position.

[0041] Specifically, during injection molding, the baffle 51 is at the bottom of the mold cavity 47, sealing the bottom of the mold cavity 47, and the baffle 51 is supported by the push rod 44, so that there is no gap between the baffle 51 and the mold cavity 47, and cooling water is sprayed to the baffle 51 through the nozzle 73. When the injection molding is completed, the baffle 51 is moved upward by the ear 53, so that the nozzle 73 can spray water to the bottom plate of the foam box, so that the bottom plate of the foam box can be cooled. This structural design allows the foam packaging box to be effectively cooled during the molding process, ensuring product quality while improving production efficiency.

[0042] like Figure 1 As shown, in some embodiments, the frame 1 serves as the supporting body of the entire device, and a front frame 12 and a rear frame 15 are respectively arranged on the frame 1. The front frame 12 is mainly connected to the core mold assembly 3 through a plurality of light rods 13 and a plurality of screw rods 14. Specifically, a plurality of light rods 13 are arranged one by one with a plurality of first through holes 33, and the light rods 13 are slidably connected with the first through holes 33, and the top ends thereof are fixedly connected with the fourth through holes 48. In this design, the light rods 13 mainly play a role in guiding the core mold assembly 3 during the movement of the core mold assembly 3. The screw rod 14 is transmission-connected to the connecting sleeve 32, and the screw rod 14 is driven to rotate by the driving motor 11, thereby driving the core mold assembly 3 to move.

[0043] In the fixed connection design between the rear frame 15 and the push rod 44, not only the structural firmness is ensured, but also the precise control of the push rod 44 is achieved. The push rod 44 is an important actuator in the cooling device, and its movement is directly related to the molding quality and efficiency of the foam packaging box. Through the precise movement of the push rod 44, the uniformity and consistency of the cooling process can be ensured, thereby effectively avoiding deformation or quality defects of the foam packaging box caused by uneven cooling.

[0044] like Figure 7As shown, in some embodiments, the first cooling component 2 is provided with a first water inlet pipe 21, multiple cooling pipes 22 and multiple water outlet pipes 23. The first water inlet pipe 21 is respectively connected to the multiple cooling pipes 22, and the water outlet pipe 23 is connected to the cooling pipes 22. The cooling pipes 22 are arranged in the first cooling channel 34. Moreover, these cooling pipes 22 are made of materials with excellent thermal conductivity to ensure that the cooling effect can be fully guaranteed.

[0045] Furthermore, in some embodiments, the third cooling assembly 7 is also provided with a third water inlet pipe 71, and the third water inlet pipe 71 is connected to the water distribution pipe 72. The cooling water is passed into the water distribution pipe 72 through the third water inlet pipe 71, and then the cooling water is sprayed toward the baffle 51 and the bottom plate of the foam box through the nozzle 73, thereby achieving a more efficient, uniform and reliable cooling effect, thereby improving the efficiency and quality of the foam packaging box molding.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cooling device for forming a foam packaging box, comprising a frame (1), characterized in that: A core mold assembly (3) and a bottom mold assembly (4) are arranged in the frame (1), the core mold assembly (3) and the bottom mold assembly (4) being arranged correspondingly, the bottom mold assembly (4) being provided with a barrier assembly (5) and a third cooling assembly (7), the barrier assembly (5) being arranged on the front side of the third cooling assembly (7); The third cooling assembly (7) is provided with a plurality of water distribution pipes (72), the water distribution pipes (72) are provided with a plurality of nozzles (73), the plurality of nozzles (73) are distributed in an array along the vertical direction of the water distribution pipes (72), and the nozzles (73) are configured to spray cooling water flow toward the barrier assembly (5) and the bottom plate of the foam box; The bottom mold assembly (4) is provided with a cooling bin and a slide groove (42), the cooling bin is connected to the slide groove (42), the water distribution pipe (72) is arranged in a plurality of the cooling bins, and the barrier assembly (5) is slidably connected to the slide groove (42).

2. The cooling device for foam packaging box molding according to claim 1, characterized in that: The bottom mold assembly (4) further comprises a bottom mold shell (41), a plurality of second through holes (43), a plurality of mold cavities (47) and a plurality of second cooling channels (49), the plurality of second through holes (43) being connected to a plurality of water distribution pipes (72) in a one-to-one correspondence, and the second through holes (43) being connected to the water distribution pipes (72); The slide groove (42) is arranged on the front side of the second through hole (43), the plurality of mold cavities (47) are arranged in the bottom mold shell (41), the second cooling channel (49) is arranged on the outside of the mold cavity (47), and the second cooling channel (49) is configured to be connected to the second cooling assembly (6); Positioning holes (46) are provided between the plurality of mold cavities (47).

3. The cooling device for foam packaging box molding according to claim 2, characterized in that: The bottom mold shell (41) is provided with a cover plate (411) and a plurality of push rods (44); the cooling bin is provided between the cover plate (411) and the mold cavity (47); a guide plate (45) is provided at the bottom of the cooling bin; a water collecting trough (451) is provided inside the guide plate (45); and the water collecting trough (451) is connected to the cooling bin; A plurality of push rods (44) are slidably connected to the cover plate (411), the push rods (44) are connected to the barrier assembly (5), the four corners of the mold cavity (47) are respectively provided with the push rods (44), the push rods (44) are used to press the barrier assembly (5) and push out the molded foam box; The bottom mold shell (41) is also provided with a plurality of fourth through holes (48).

4. The cooling device for forming a foam packaging box according to claim 1, characterized in that: The core mold assembly (3) comprises an upper fixing plate (31), a plurality of first cooling channels (34) and a plurality of core modules (36); one side of the upper fixing plate (31) is provided with two connecting sleeves (32) and a plurality of first through holes (33); the two connecting sleeves (32) are respectively arranged on the side edges of the upper fixing plate (31); the connecting sleeves (32) are provided with internal threads; the plurality of first through holes (33) and the plurality of fourth through holes (48) are arranged in a one-to-one correspondence; The core module (36) is arranged on the other side of the upper fixing plate (31), a plurality of the first cooling channels (34) are arranged in the upper fixing plate (31) and the core module (36), and the first cooling channels (34) are used to connect the first cooling assembly (2); Positioning columns (35) are provided between the core modules (36), and the positioning columns (35) and the positioning holes (46) are arranged correspondingly.

5. The cooling device for foam packaging box molding according to claim 1, characterized in that: The baffle assembly (5) comprises a baffle plate (51), a limit block (52) and a lifting ear (53); the limit block (52) is fixedly connected to the side of the baffle plate (51); the lifting ear (53) is fixedly connected to the top of the baffle plate (51); and the baffle plate (51) is slidably connected to the slide groove (42).

6. The cooling device for forming a foam packaging box according to claim 1, characterized in that: The frame (1) is provided with a front frame (12) and a rear frame (15); the front frame (12) is provided with a plurality of polished rods (13) and a plurality of screw rods (14); the plurality of polished rods (13) are arranged in a one-to-one correspondence with the plurality of first through holes (33); the polished rods (13) are slidably connected to the first through holes (33); the top ends of the polished rods (13) are fixedly connected to the fourth through holes (48); the screw rods (14) are transmission-connected to the connecting sleeve (32); the screw rods (14) are connected to the driving motor (11); and the driving motor (11) drives the screw rods (14) to rotate; The rear frame (15) is fixedly connected to the fixed end of the push rod (44).

7. The cooling device for forming a foam packaging box according to any one of claims 1 to 6, characterized in that: The first cooling assembly (2) is provided with a first water inlet pipe (21), a plurality of cooling pipes (22) and a plurality of water outlet pipes (23); the first water inlet pipe (21) is connected to the cooling pipes (22) respectively; the water outlet pipes (23) are connected to the cooling pipes (22); the cooling pipes (22) are arranged in the first cooling channel (34); and the cooling pipes (22) are made of a material with good thermal conductivity.

8. The cooling device for forming a foam packaging box according to claim 7, characterized in that: The third cooling assembly (7) is further provided with a third water inlet pipe (71), and the third water inlet pipe (71) is connected to the water distribution pipe (72).

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