Cooling device for plastic corrugator

Abstract

The application discloses a cooling device of a plastic corrugated pipe extruder, a first cooling cavity is arranged in the thickness direction of a first die assembly, at least one first liquid inlet is arranged at the top of the first cooling cavity, and at least one first liquid outlet is arranged at the middle and / or lower part of the first cooling cavity; the first filling assembly comprises at least one first filling port, and the first filling port is arranged correspondingly to the first liquid inlet; the cooling device of the plastic corrugated pipe extruder is filled by the first filling assembly, and the structural complexity of the first filling assembly is simplified; the process of heat exchange of the cooling liquid gradually after entering the first die assembly is continuously carried out; during the basic forming process of the plastic corrugated pipe, the temperature difference between the first die assembly and the plastic in the molten state is not too large, and the forming quality of the plastic corrugated pipe is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of corrugated pipe processing device, in particular to a kind of plastic corrugated pipe extruder cooling device. BACKGROUND

[0002] Plastic corrugated pipe extruder is generally two groups of mold chain arranged in pairs, and each group of mold chain is formed by multiple pairs of forming sub-mold, and the plastic corrugated pipe is formed by the combination and separation of the two groups of mold chain.

[0003] In the prior art, the forming sub-mold of the plastic corrugated pipe extruder either does not consider cooling factors at all or has a complex cooling water circulation line. Specifically, the forming sub-mold has a cooling liquid cavity inside, and the liquid inlet pipe of the cooling liquid cavity is connected to the total cooling liquid circuit pipe. Since the forming sub-mold is in a circulating operation process, the total cooling liquid circuit pipe should also be accompanied by a circulating operation. The above arrangement greatly increases the complexity of the cooling device of the plastic corrugated pipe extruder and increases the probability of abnormality. Moreover, all the forming sub-molds are in the same temperature state, which may cause excessive or insufficient cooling. There is also a case of directly spraying water on the inside of the forming sub-mold for cooling, which makes the working conditions of the entire plastic corrugated pipe extruder more complex and also causes excessive cooling.

[0004] In the prior art, the cooling method of the forming sub-mold is complex, and there is a situation of excessive or insufficient cooling. SUMMARY

[0005] The main purpose of the present application is to provide a cooling device for a plastic corrugated pipe extruder, which aims to solve the problem of complex cooling method of the forming sub-mold and the situation of excessive or insufficient cooling.

[0006] To achieve the above purpose, the present application provides a cooling device for a plastic corrugated pipe extruder, comprising:

[0007] a base, which supports the cooling device of the plastic corrugated pipe extruder;

[0008] a first driving device arranged on the base;

[0009] a first mold assembly chain comprising a plurality of first mold assemblies connected in sequence, wherein each first mold assembly is provided with a first cooling cavity in the thickness direction, the top of the first cooling cavity is provided with at least one first liquid inlet, and the middle and / or lower part of the first cooling cavity is provided with at least one first liquid outlet; the first mold assembly chain is arranged on the outer periphery of the first driving device and is driven to rotate in the horizontal direction, and the outer side of the first mold assembly away from the first driving device is a first forming cavity;

[0010] The first filling assembly comprises at least one first filling port corresponding to the first liquid inlet, and is fixed to the base or an external fixed structure.

[0011] The second driving device is arranged on the base.

[0012] The second mold assembly chain comprises a plurality of second mold assemblies connected in sequence, each of the second mold assemblies is provided with a second cooling cavity in the thickness direction, the top of the second cooling cavity is provided with at least one second liquid inlet, and the middle and / or lower part of the second cooling cavity is provided with at least one second liquid outlet; the second mold assembly chain is arranged on the outer periphery of the second driving device and is driven to rotate in the horizontal direction, the outer side of the second mold assembly away from the second driving device is a second forming cavity, the second mold assembly chain is arranged corresponding to the first mold assembly chain, and the intersection area of the two is a forming area.

[0013] The second filling assembly comprises at least one second filling port corresponding to the second liquid inlet, and is fixed to the base or an external fixed structure.

[0014] Further, the first mold assembly comprises a first front plate and a first rear plate detachably connected to the first front plate, and the first front plate and the first rear plate combine to form the first cooling cavity; the second mold assembly comprises a second front plate and a second rear plate detachably connected to the second front plate, and the second front plate and the second rear plate combine to form the second cooling cavity.

[0015] Further, the first cooling cavity comprises a plurality of first cooling channels arranged at intervals of 0.1-2.0 mm in the length direction of the first mold assembly, the first cooling channels extend along the height direction of the first mold assembly, the size proportion of the plurality of first cooling channels in the length direction of the first mold assembly is 70-95%, the size proportion of the first liquid inlet in the length direction of the first mold assembly is 70-95%, the upper end of the first cooling channel is connected to the first liquid inlet, and the lower end of the first cooling channel is the first liquid outlet.

[0016] The second cooling cavity comprises a plurality of second cooling channels arranged at intervals of 0.1-2.0 mm in the length direction of the second mold assembly, the second cooling channels extend along the height direction of the second mold assembly, the size proportion of the plurality of second cooling channels in the length direction of the second mold assembly is 70-95%, the size proportion of the second liquid inlet in the length direction of the second mold assembly is 70-95%, the upper end of the second cooling channel is connected to the second liquid inlet, and the lower end of the second cooling channel is the second liquid outlet.

[0017] Further, the first cooling channel and the second cooling channel are rectangular in cross section.

[0018] Further, the first cooling cavity is cuboid in whole and the inner wall is undulating in the length direction of the first mold assembly; the second cooling cavity is cuboid in whole and the inner wall is undulating in the length direction of the second mold assembly.

[0019] Further, the thickness of the first cooling cavity is 50% to 70% of the thickness of the first mold assembly, and the thickness of the second cooling cavity is 50% to 70% of the thickness of the second mold assembly.

[0020] Further, the first liquid outlet is arranged at the middle of the first cooling cavity, and the first liquid outlet is arranged at the side of the first mold assembly close to the first driving device; the second liquid outlet is arranged at the middle of the second cooling cavity, and the second liquid outlet is arranged at the side of the second mold assembly close to the second driving device.

[0021] Further, the first front plate is arranged to be higher than the first back plate, the second front plate is arranged to be higher than the second back plate, the bottom of the first filling port is arranged to be lower than the top of the first front plate, and the bottom of the second filling port is arranged to be lower than the top of the second front plate.

[0022] Further, the first cooling cavity penetrates the height direction of the first mold assembly, and the first liquid outlet is arranged at the bottom of the first cooling cavity; the second cooling cavity penetrates the height direction of the second mold assembly, and the second liquid outlet is arranged at the bottom of the second cooling cavity; the cooling device further comprises a first liquid sealing plate fixed to the base, the first liquid sealing plate is arranged in the forming area, and the first liquid outlet and the second liquid outlet both have a gap of 0.1-2.0mm with the first liquid sealing plate.

[0023] Further, the cooling device further comprises two second liquid sealing plates fixed to the base, the area from the first filling port to the forming area and the area from the second filling port to the forming area are liquid filling areas, the second liquid sealing plates are arranged in the liquid filling areas, and the first liquid outlet and the second liquid outlet both have a gap of 0.1-2.0mm with the second liquid sealing plates.

[0024] The cooling device of the plastic corrugated pipe extruder provided by the application, the first filling assembly does not rotate with the first die assembly chain, all the first cooling cavities are filled through the first filling assembly, and the structural complexity of the first filling assembly is simplified; when the cooling liquid just enters the first die assembly, the cooling liquid has not exchanged heat with the first die assembly much, and the temperature difference between the first die assembly and the plastic in a molten state is not too large; when the contact time between the first die assembly and the gradually molten and hardened plastic is continuously increased, the cooling effect of the cooling liquid on the first die assembly is also continuously increased; during the basic forming process of the plastic corrugated pipe, the temperature difference between the first die assembly and the plastic in a molten state is not too large, and the forming quality of the plastic corrugated pipe is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a schematic diagram of the cooling device of the plastic corrugated pipe extruder according to an embodiment of the application;

[0026] Figure 2 FIG. 2 is a schematic diagram of the first die assembly in the cooling device of the plastic corrugated pipe extruder according to an embodiment of the application (one perspective view);

[0027] Figure 3 FIG. 3 is a schematic diagram of the first die assembly in the cooling device of the plastic corrugated pipe extruder according to an embodiment of the application (another perspective view);

[0028] Figure 4 FIG. 4 is a schematic diagram of the first die assembly in the cooling device of the plastic corrugated pipe extruder according to a second embodiment of the application (one perspective view);

[0029] Figure 5 FIG. 5 is a schematic diagram of the first die assembly in the cooling device of the plastic corrugated pipe extruder according to a second embodiment of the application (another perspective view);

[0030] Figure 6 FIG. 6 is an assembly schematic diagram of the first die assembly in the cooling device of the plastic corrugated pipe extruder according to a second embodiment of the application;

[0031] Figure 7 FIG. 7 is an assembly schematic diagram of the first die assembly in the cooling device of the plastic corrugated pipe extruder according to a third embodiment of the application;

[0032] Figure 8 FIG. 8 is a schematic diagram of the first liquid sealing plate and the second liquid sealing plate in the cooling device of the plastic corrugated pipe extruder according to a fourth embodiment of the application.

[0033] The implementation, functional features and advantages of the application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0034] It is to be understood that the embodiments described herein are merely exemplary of the application and that a person skilled in the art can make modifications to the specific embodiments described herein without departing from the scope of the application.

[0035] As those skilled in the art will appreciate, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0036] As those skilled in the art will appreciate, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0037] With reference to Figures 1-8 In an embodiment of the present application, a cooling device for a plastic corrugated pipe extruder comprises:

[0038] A base 100 is provided to support the cooling device for the plastic corrugated pipe extruder.

[0039] A first driving device 200 is arranged on the base 100.

[0040] A first mold assembly chain 300 comprises a plurality of first mold assemblies 310 connected in sequence, each of the first mold assemblies 310 is provided with a first cooling cavity 311 in the thickness direction, the top of the first cooling cavity 311 is provided with at least one first liquid inlet 312, and the middle and / or lower part of the first cooling cavity 311 is provided with at least one first liquid outlet 313. The first mold assembly chain 300 is arranged on the outer periphery of the first driving device 200 and is driven to rotate in the horizontal direction. The outer side of the first mold assembly 310 away from the first driving device 200 is a first forming cavity 314.

[0041] The first filling assembly 400 comprises at least one first filling port 410 corresponding to the first liquid inlet 312, and is fixed to the base 100 or an external fixed structure.

[0042] The second driving device 500 is arranged on the base 100.

[0043] The second mold assembly chain 600 comprises a plurality of second mold assemblies 610 connected in sequence, each of which is provided with a second cooling cavity in the thickness direction, and at least one second liquid inlet is arranged on the top of the second cooling cavity, and at least one second liquid outlet is arranged on the middle and / or lower part of the second cooling cavity. The second mold assembly chain 600 is arranged on the outer periphery of the second driving device 500 and is driven to rotate in the horizontal direction. The second mold assembly 610 away from the outer side of the second driving device 500 is a second forming cavity. The second mold assembly chain 600 is arranged corresponding to the first mold assembly chain 300, and the intersection area of the two is a forming area 700.

[0044] The second filling assembly 800 comprises at least one second filling port 810 corresponding to the second liquid inlet, and is fixed to the base 100 or an external fixed structure.

[0045] In the prior art, the forming sub-mold of the plastic corrugated pipe extruder either does not consider the cooling factor at all or has a complex cooling water circulation line. Specifically, the forming sub-mold has a cooling liquid cavity in the inside, and the liquid inlet pipe of the cooling liquid cavity is connected to the total cooling liquid return pipe. Since the forming sub-mold is in a circulating operation process, the total cooling liquid return pipe should also be accompanied by a circulating operation. The above arrangement greatly increases the complexity of the cooling device of the plastic corrugated pipe extruder, and increases the probability of abnormality. Moreover, all the forming sub-molds are in the same temperature state, which may cause excessive or insufficient cooling.

[0046] In the present application, the cooling liquid in the first cooling cavity 311 and the second cooling cavity is water. The horizontal arrangement of the first mold assembly chain 300 and the second mold assembly chain 600 is to facilitate the water filling and water leakage of the first cooling cavity 311 and the second cooling cavity. The above-mentioned horizontal arrangement of the first mold assembly chain 300 and the second mold assembly chain 600 is not limited to be completely horizontal, and can also allow a small angle of inclination (for example, an inclination of 15 degrees upward or downward from the horizontal). Taking the first driving device 200 and the first mold assembly chain 300 as an example, the first driving device 200 can be a conveyor belt structure, and the plurality of first mold assemblies 310 of the first mold assembly chain 300 are sequentially fixed on the conveyor belt of the first driving device 200; or the plurality of first mold assemblies 310 are fixedly connected with each other, and the first driving device 200 drives the first mold assembly chain 300 to rotate. During installation, the first filling assembly 400 and the second filling assembly 800 can be directly or indirectly connected to the base 100, or fixed to an external fixed structure (such as a wall). The water filling process of the first filling assembly 400 and the second filling assembly 800 can be intermittent or uninterrupted. When the water filling process is intermittent, corresponding probes (for example, infrared alignment probes arranged on the first mold assembly 310 and the first filling assembly 400, respectively, to achieve alignment and then filling) are arranged on the first filling assembly 400 and the second filling assembly 800, so as to accurately fill the first filling port 410 and the second filling port 810.

[0047] In the present application, the first filling assembly 400 does not rotate with the first mold assembly chain 300, and all the first cooling cavities 311 are filled by the first filling assembly 400, which greatly simplifies the structural complexity of the first filling assembly 400. Taking the first mold assembly chain 300 as an example, when the cooling liquid just enters the first mold assembly 310, there is not much heat exchange between the cooling liquid and the first mold assembly 310, and the temperature difference between the first mold assembly 310 and the molten plastic is not too large. When the contact time between the first mold assembly 310 and the gradually melting and hardening plastic increases, the cooling effect of the cooling liquid on the first mold assembly 310 also increases. That is, through the arrangement of the first cooling cavity 311, the temperature difference between the first mold assembly 310 and the molten plastic during the forming process of the plastic corrugated pipe is not too large, which ensures the forming quality of the plastic corrugated pipe, especially when the wall thickness of the plastic corrugated pipe is thin. The above-mentioned temperature difference is important for the product forming quality. The above-mentioned arrangement of the first cooling cavity 311 eliminates the complex cooling water circuit system, and reduces the structural complexity of the cooling device of the plastic corrugated pipe extruder.

[0048] Referring to 2-3, in one embodiment, the first mold assembly 310 comprises a first front plate 315 and a first back plate 316 detachably connected to the first front plate 315, and the first front plate 315 and the first back plate 316 combine to form the first cooling cavity 311; the second mold assembly 610 comprises a second front plate and a second back plate detachably connected to the second front plate, and the second front plate and the second back plate combine to form the second cooling cavity.

[0049] In one embodiment, the first front plate 315 and the first back plate 316 and the second front plate and the second back plate can be connected by clamping or bolting, etc. The above sets the first mold assembly 310 and the second mold assembly 610 as a split structure; the difficulty of the first cooling cavity 311 or the second cooling cavity is greatly reduced, and the shape can be selected to improve. Taking the first mold assembly 310 as an example, a first flow channel is formed on the side of the first front plate 315 facing the first back plate 316 by casting or milling, and a second flow channel corresponding to the first flow channel is formed on the side of the first back plate 316 facing the first front plate 315 by casting or milling; when the first front plate 315 and the first back plate 316 are combined, the first flow channel and the second flow channel form the first cooling cavity 311.

[0050] Referring to 4-6, in one embodiment, the first cooling cavity 311 comprises a plurality of first cooling channels 317 arranged at intervals of 0.1-2.0mm in the length direction of the first mold assembly 310, the first cooling channels 317 extend in the height direction of the first mold assembly 310, the overall size of the plurality of first cooling channels 317 in the length direction of the first mold assembly 310 accounts for 70-95%, the size of the first liquid inlet 312 in the length direction of the first mold assembly 310 accounts for 70-95%, the upper end of the first cooling channel 317 is connected to the first liquid inlet 312, and the lower end of the first cooling channel 317 is the first liquid outlet 313.

[0051] The second cooling cavity comprises a plurality of second cooling channels arranged at intervals of 0.1-2.0mm in the length direction of the second mold assembly 610, the second cooling channels extend in the height direction of the second mold assembly 610, the overall size of the plurality of second cooling channels in the length direction of the second mold assembly 610 accounts for 70-95%, the size of the second liquid inlet in the length direction of the second mold assembly 610 accounts for 70-95%, the upper end of the second cooling channel is connected to the second liquid inlet, and the lower end of the second cooling channel is the second liquid outlet.

[0052] In one embodiment, taking the first cooling cavity 311 as an example, through the shape setting of the plurality of first cooling channels 317 described above, the contact area of the first cooling cavity 311 with the first mold assembly 310 can be increased, and the speed of the cooling liquid discharged from the first cooling cavity 311 is moderate. The spacing between the first cooling channels 317 should not be too large, otherwise the effect of increasing the surface area is not obvious. The diameter of the first cooling channel 317 and the second cooling channel ranges from 5.0-50.0mm.

[0053] Referring to FIG. 7, in one embodiment, the first cooling channel 317 and the second cooling channel have a rectangular cross section.

[0054] The above cross section limits the processing difficulty (convenient milling), and the surface area of the first cooling channel 317 or the second cooling channel is larger.

[0055] In one embodiment, the first cooling cavity 311 is a whole cube shape and the inner wall has a wavy structure in the length direction of the first mold assembly 310; the second cooling cavity is a whole cube shape and the inner wall has a wavy structure in the length direction of the second mold assembly 610.

[0056] Taking the first cooling cavity 311 as an example, its structure not only meets the requirement of containing the amount of cooling liquid, but also increases the area of the first cooling cavity 311, thereby improving the cooling effect of the cooling liquid in the first cooling cavity 311.

[0057] In one embodiment, the thickness of the first cooling cavity 311 is 50% to 70% of the thickness of the first mold assembly 310, and the thickness of the second cooling cavity is 50% to 70% of the thickness of the second mold assembly 610.

[0058] The above size limits improve the capacity of the first cooling cavity 311 and the second cooling cavity, and the above structure is relatively easy to achieve through a split structure.

[0059] In one embodiment, the first liquid outlet 313 is arranged at the middle position of the first cooling cavity 311, and the first liquid outlet 313 is arranged at the side of the first mold assembly 310 close to the first driving device 200; the second liquid outlet is arranged at the middle position of the second cooling cavity, and the second liquid outlet is arranged at the side of the second mold assembly 610 close to the second driving device 500.

[0060] In the embodiment, the first liquid outlet 313 is arranged at the middle of the first cooling cavity 311, so that the cooling liquid in the first cooling cavity 311 is discharged at a slow speed. Due to the density, the discharged cooling liquid is at a high temperature, and the cooling liquid at a low temperature tends to stay at the bottom of the first cooling cavity 311, which is beneficial to the working effect of the cooling liquid in the first cooling cavity 311.

[0061] Referring to Figures 4-6 In one embodiment, the first front plate 315 is arranged higher than the first back plate 316, the second front plate is arranged higher than the second back plate, the bottom of the first filling port 410 is arranged lower than the top of the first front plate 315, and the bottom of the second filling port 810 is arranged lower than the top of the second front plate.

[0062] In the embodiment, the bottom of the first filling port 410 is arranged lower than the top of the first front plate 315, so that the cooling liquid flowing out of the first filling port 410 cannot flow into the first forming cavity 314. Specifically, the cooling liquid continuously flowing out of the first filling port 410 cools the first mold assembly 310 while filling the first cooling cavity 311, and the height of the first filling port 410 limits the possibility of the first forming cavity 314 being contaminated.

[0063] Referring to Figures 4-6 In one embodiment, the two side walls of the first front plate 315 are provided with the first water-blocking groove 318 recessed in the height direction, and the two side walls of the second front plate are provided with the second water-blocking groove recessed in the height direction.

[0064] In the embodiment, the first water-blocking groove 318 does not hinder the splicing of two adjacent first mold assemblies 310. The cooling liquid flows down from the first water-blocking groove 318, which prevents the cooling liquid from flowing into the first forming cavity 314 from the side wall of the first front plate 315.

[0065] Referring to Figure 8In one embodiment, the first cooling cavity 311 extends through the height direction of the first mold assembly 310, the first liquid outlet 313 is arranged at the bottom of the first cooling cavity 311; the second cooling cavity extends through the height direction of the second mold assembly 610, the second liquid outlet is arranged at the bottom of the second cooling cavity; the cooling device further comprises a first liquid sealing plate 110 fixed to the base 100, the first liquid sealing plate 110 is arranged in the forming area 700, and the first liquid outlet 313 and the second liquid outlet both have a gap of 0.1-2.0 mm with the first liquid sealing plate 110.

[0066] The small gap between the first liquid sealing plate 110 and the first liquid outlet 313 and between the first liquid sealing plate 110 and the second liquid outlet reduces the discharge speed of the cooling liquid, and the viscosity and tension of the cooling liquid also reduce the discharge speed, thereby prolonging the residence time of the cooling liquid in the first cooling cavity 311 or the second cooling cavity. The first liquid sealing plate 110 can be a split structure and can follow the bending trend of the first mold assembly chain 300 or the second mold assembly chain 600; the first liquid sealing plate 110 can also be an entire plate structure.

[0067] Referring to Figure 8 In one embodiment, the cooling device further comprises two second liquid sealing plates 120 fixed to the base 100, the area from the first filling port 410 to the forming area 700 and the area from the second filling port 810 to the forming area 700 are liquid injection areas, the second liquid sealing plates 120 are arranged in the liquid injection areas, and the first liquid outlet 313 and the second liquid outlet both have a gap of 0.1-2.0 mm with the second liquid sealing plates 120.

[0068] The small gap between the second liquid sealing plate 120 and the first liquid outlet 313 or between the second liquid sealing plate 120 and the second liquid outlet reduces the discharge speed of the cooling liquid, and the viscosity and tension of the cooling liquid also reduce the discharge speed, thereby reducing waste reaching the forming area 700; in particular, the diameters of the first liquid outlet 313 and the second liquid outlet can be increased (e.g., greater than 5 mm), so that the high-temperature cooling liquid is discharged quickly after the first mold assembly 310 or the second mold assembly 610 passes through the forming area 700, facilitating the injection of new cooling liquid again. The second liquid sealing plate 120 can be a split structure and can follow the arrangement trend of the first mold assembly chain 300 and the second mold assembly chain 600; the second liquid sealing plate 120 can also be an entire plate structure.

[0069] In summary, the cooling device of the plastic corrugated pipe extruder provided by the application, the first filling assembly 400 does not rotate with the first die assembly chain 300, all the first cooling cavities 311 are filled by the first filling assembly 400, and the structural complexity of the first filling assembly 400 is simplified; when the cooling liquid just enters the first die assembly 310, the cooling liquid has not yet exchanged heat with the first die assembly 310 much, at this time, the temperature difference between the first die assembly 310 and the plastic in the molten state will not be too large; when the contact time between the first die assembly 310 and the gradually molten and hardened plastic is continuously increased, the cooling effect of the cooling liquid on the first die assembly 310 is also continuously increased; during the basic forming process of the plastic corrugated pipe, the temperature difference between the first die assembly 310 and the plastic in the molten state will not be too large, and the forming quality of the plastic corrugated pipe is ensured.

[0070] The above description is only the preferred embodiments of the application, and does not limit the patent scope of the application, and any equivalent structure or equivalent process transformation obtained by using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the application.

Claims

1. Cooling device for a plastic corrugator extruder, characterized in that include: The base (100) serves as a support for the cooling device of the plastic corrugated pipe extruder; A first driving device (200) is disposed on the base (100); The first mold assembly chain (300) includes a plurality of first mold assemblies (310) connected in sequence. The first mold assembly (310) has a first cooling cavity (311) in the thickness direction. The top of the first cooling cavity (311) has at least one first liquid inlet (312). The middle and / or lower part of the first cooling cavity (311) has at least one first liquid outlet (313). The first mold assembly chain (300) is encircled on the outer periphery of the first driving device (200) and is driven to rotate in the horizontal direction. The outer side of the first mold assembly (310) away from the first driving device (200) is the first molding cavity (314). The first filling component (400) includes at least one first filling port (410), the first filling port (410) is provided corresponding to the first liquid filling port (312), and the first filling component (400) fixes the base (100) or an external fixing structure. A second driving device (500) is disposed on the base (100); The second mold assembly chain (600) includes a plurality of second mold assemblies (610) connected in sequence. Each second mold assembly (610) has a second cooling cavity in its thickness direction. At least one second liquid inlet is provided at the top of the second cooling cavity, and at least one second liquid outlet is provided in the middle and / or lower part of the second cooling cavity. The second mold assembly chain (600) is encircled around the outer periphery of the second driving device (500) and is driven to rotate in the horizontal direction. The outer side of each second mold assembly (610) opposite to the second driving device (500) forms a second molding cavity. The second mold assembly chain (600) is correspondingly arranged with the first mold assembly chain (300), and their intersection area forms a molding area (700). The second filling assembly (800) includes at least one second filling port (810), the second filling port (810) is provided corresponding to the second liquid filling port, and the second filling assembly (800) fixes the base (100) or an external fixing structure; The first mold assembly (310) includes a first front plate (315) and a first rear plate (316) detachably connected to the first front plate (315), wherein the first front plate (315) and the first rear plate (316) are combined to form the first cooling cavity (311); the second mold assembly (610) includes a second front plate and a second rear plate detachably connected to the second front plate, wherein the second front plate and the second rear plate are combined to form the second cooling cavity; The first cooling chamber (311) includes a plurality of first cooling channels (317) arranged at intervals of 0.1-2.0 mm along the length of the first mold assembly (310). The first cooling channels (317) extend along the height of the first mold assembly (310). The upper end of the first cooling channel (317) is connected to the first liquid inlet (312), and the lower end of the first cooling channel (317) is the first liquid outlet (313). The second cooling chamber includes a plurality of second cooling channels arranged at intervals of 0.1-2.0 mm along the length of the second mold assembly (610). The second cooling channels extend along the height of the second mold assembly (610). The upper end of the second cooling channel is connected to the second liquid inlet, and the lower end of the second cooling channel is the second liquid outlet.

2. Cooling device for a plastic bellows extruder according to claim 1, characterized in that The overall size of the plurality of first cooling channels (317) in the length direction of the first mold assembly (310) is 70-95%, and the size of the first liquid inlet (312) in the length direction of the first mold assembly (310) is 70-95%. The overall size of the multiple second cooling channels in the length direction of the second mold assembly (610) is 70-95%, and the size of the second liquid inlet in the length direction of the second mold assembly (610) is 70-95%.

3. The cooling device for a plastic bellows extruder according to claim 1, characterized in that The first cooling channel (317) and the second cooling channel have rectangular cross-sections.

4. The cooling device for the plastic corrugated pipe extruder according to claim 1, characterized in that, The first cooling chamber (311) is generally cubic in shape and its inner wall has an undulating structure along the length of the first mold assembly (310); the second cooling chamber is generally cubic in shape and its inner wall has an undulating structure along the length of the second mold assembly (610).

5. The cooling device for the plastic corrugated pipe extruder according to claim 4, characterized in that, The thickness of the first cooling cavity (311) is 50% to 70% of the thickness of the first mold assembly (310), and the thickness of the second cooling cavity is 50% to 70% of the thickness of the second mold assembly (610).

6. The cooling device for the plastic corrugated pipe extruder according to claim 1, characterized in that, The first liquid outlet (313) is located in the middle of the first cooling chamber (311), and the first liquid outlet (313) is located on the side of the first mold assembly (310) near the first driving device (200); the second liquid outlet is located in the middle of the second cooling chamber, and the second liquid outlet is located on the side of the second mold assembly (610) near the second driving device (500).

7. The cooling device for a plastic corrugated pipe extruder according to any one of claims 2-6, characterized in that, The first front plate (315) is positioned higher than the first rear plate (316), the second front plate is positioned higher than the second rear plate, the bottom of the first filling port (410) is lower than the top of the first front plate (315), and the bottom of the second filling port (810) is lower than the top of the second front plate.

8. The cooling device for the plastic corrugated pipe extruder according to claim 1, characterized in that, The first cooling chamber (311) extends through the height direction of the first mold assembly (310), and the first liquid outlet (313) is located at the bottom of the first cooling chamber (311); the second cooling chamber extends through the height direction of the second mold assembly (610), and the second liquid outlet is located at the bottom of the second cooling chamber; the cooling device further includes a first sealing plate (110) fixed to the base (100), the first sealing plate (110) is located in the molding area (700), and both the first liquid outlet (313) and the second liquid outlet have a gap of 0.1-2.0 mm between them and the first sealing plate (110).

9. The cooling device for the plastic corrugated pipe extruder according to claim 8, characterized in that, The cooling device further includes two second sealing plates (120) fixed to the base (100). The area from the first filling port (410) to the molding area (700) and the area from the second filling port (810) to the molding area (700) are the injection areas. The second sealing plates (120) are disposed in the injection areas. The first liquid outlet (313) and the second liquid outlet have a gap of 0.1-2.0 mm between them and the second sealing plates (120).

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