A closed large-diameter extruder cooling system

Abstract

The present invention relates to a cooling system for a closed large-diameter extruder, which includes a base and an extruder body fixedly installed on the base. It further includes a first ring, two of which are movably arranged on the base and coincide with the central axis of the extruder body, and are connected to a mutually approaching and moving mechanism installed on the base. A spray head is movably arranged on the inner wall of the first ring and is connected through a rotating mechanism to a water pumping mechanism and an air pumping mechanism installed on the base. The mutually approaching and moving mechanism is used to drive the two first rings to move closer to or away from each other along the axial direction of the extruder body and drive the spray head to rotate along the outer periphery of the extruder body. The water pumping mechanism works when the two first rings approach each other to prompt the spray head to perform a water spraying action on the extruder body. Ultimately, the cooling efficiency is greatly improved, providing guarantee for the normal operation of the extruder body 2.

Description

Technical Field

[0001] The invention relates to the technical field related to extruders, in particular to a closed large-caliber extruder cooling system. Background Art

[0002] In plastic extrusion equipment, plastic extruders are usually called main machines, while the subsequent equipment plastic extrusion molding machines are called auxiliary machines. After more than 100 years of development, plastic extruders have evolved from the original single screw to twin screws, multiple screws, and even screwless machines. Plastic extruders (main machines) can be matched with various plastic molding auxiliary machines such as pipes, films, holding materials, monofilaments, flat wires, strapping tapes, extruded nets, plates (sheets), profiles, granulation, cable coating, etc. to form various plastic extrusion molding production lines and produce various plastic products. Therefore, plastic extrusion molding machinery is one of the widely used machines in the plastic processing industry, whether now or in the future.

[0003] The extrusion method of a plastic extruder generally refers to melting the plastic at a high temperature of about 200 degrees, and then the molten plastic forms the required shape when passing through the mold. Extrusion molding requires a deep understanding of the characteristics of plastics and rich experience in mold design. It is a molding method with high technical requirements. The cooling device is set to ensure that the plastic is within the temperature range required by the process. Specifically, it is to eliminate the excess heat generated by the shear friction of the screw rotation to avoid excessive temperature causing the plastic to decompose, burn or become difficult to shape.

[0004] Existing plastic extruder cooling devices generally use water cooling or air cooling. At present, most extruders use air cooling, that is, air is used as the cooling medium and cooled by fan blowing. This cooling method is relatively simple and has low cooling efficiency, making it difficult to ensure the normal operation of the extruder. Summary of the invention

[0005] The object of the present invention is to provide a closed large-diameter extruder cooling system to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A closed large-caliber extruder cooling system comprises a base and an extruder body fixedly mounted on the base, and further comprises:

[0008] Two first circular rings are movably provided on the base, and the two first circular rings are symmetrically arranged on the outer periphery of the extruder body, coincide with the central axis of the extruder body, and are connected to the opposite lateral movement mechanism installed on the base;

[0009] The nozzle is movably arranged on the inner wall of the first ring, and is connected with a water pumping mechanism and an air pumping mechanism installed on the base through a rotating mechanism. The opposite transverse movement mechanism is used to drive the two first rings to move closer to or away from each other along the axial direction of the extruder body, and drive the nozzle to rotate along the outer circumference of the extruder body;

[0010] Wherein, the water pumping mechanism works when the two first rings approach each other, so as to prompt the nozzle to perform a water spraying action on the extruder body. The air pumping mechanism works when the two first rings move away from each other, and prompts the nozzle to perform a blowing action on the extruder body.

[0011] As a further scheme of the present invention: the opposite transverse movement mechanism includes a bidirectional lead screw rotatably installed on the base, two transverse movement plates symmetrically arranged on the bidirectional lead screw, and a driving motor installed on one side of the base;

[0012] Wherein, one end of the bidirectional lead screw is connected with the output end of the driving motor. The two transverse movement plates are in threaded connection with the bidirectional lead screw, and the two first rings are respectively fixedly installed on the two transverse movement plates.

[0013] As a further scheme of the present invention: the rotating mechanism includes a transmission component installed on the base and connected with the bidirectional lead screw, and a meshing structure connecting the transmission component and the first ring. The meshing structure includes a gear rotatably installed on the transverse movement plate and a second ring sealed and rotatably installed in the first ring;

[0014] Wherein, a conduction structure is arranged between the first ring and the second ring. The outer circumference of the second ring is provided with teeth. The gear is meshed with the teeth, and the rotating shaft of the gear is connected with the transmission component.

[0015] As a further scheme of the present invention: the conduction structure includes an annular groove opened on the inner wall of the first ring and a through hole opened on the second ring. The nozzle is installed in the through hole to form a passage for supplying water from the water pumping mechanism to the nozzle and supplying air from the air pumping mechanism to the nozzle.

[0016] As a further scheme of the present invention: the transmission component includes a rotating shaft rotatably installed on the base and connected with the bidirectional lead screw through a first transmission belt, and a rotating tube rotatably installed on the transverse movement plate. The rotating tube is slidably sleeved with the rotating shaft through a limiting structure, and the rotating tube is connected with the rotating shaft of the gear through a second transmission belt;

[0017] The limiting structure includes two strip-shaped protrusions fixed on the outer periphery of the rotating shaft and two strip-shaped grooves formed on the inner wall of the rotating tube. The strip-shaped grooves are slidably adapted to the strip-shaped protrusions, and both are parallel to the central axis of the rotating shaft and the rotating tube.

[0018] As a further aspect of the present invention: The water pumping mechanism includes a water pump and a cylinder installed on the base. The water outlet of the water pump is connected to the first ring through a first connecting pipe. Two one-way valves are provided on the outer periphery of the cylinder, and one of the one-way valves is connected to the first ring through a second connecting pipe. An elastic suction assembly cooperating with the transverse movement plate is installed in the cylinder.

[0019] As a further aspect of the present invention: The elastic suction assembly includes a piston disk sealingly and slidably arranged in the cylinder, two push rods fixedly installed on the piston disk, and two protruding parts fixedly arranged on the outer wall of the cylinder and slidably connected to the two push rods;

[0020] Wherein, the two push rods are arranged in a "U" shape, and a connecting plate is fixedly connected to the ends of the two push rods away from the piston disk. A rolling cooperation structure is connected between the connecting plate and the transverse movement plate;

[0021] A cylindrical spring is sleeved on the outer periphery of each of the two push rods. One end of the cylindrical spring is connected to the connecting plate, and the other end is connected to the protruding part.

[0022] As a further aspect of the present invention: The rolling cooperation structure includes an inclined rod fixedly connected to the connecting plate through a connecting rod, a long rod fixedly installed on the side of the transverse movement plate facing the cylinder, and a pulley rotatably installed at the end of the long rod away from the transverse movement plate, and the pulley abuts against the inclined rod.

[0023] Compared with the prior art, the beneficial effects of the present invention are: The present invention has a novel design. When the opposite transverse movement mechanism works, it will drive the two first rings to move closer to or away from each other. At the same time, the opposite transverse movement mechanism can drive the rotation mechanism to move, and the rotation mechanism drives the nozzle to perform a circular motion along the circumferential direction of the extruder body. When the two first rings move closer to each other, the water pumping mechanism works, so that the nozzle sprays water on the extruder body to cool the extruder body. During the process of the two first rings moving away from each other, the water pumping mechanism stops working and the air pumping mechanism works, so that the nozzle blows air on the extruder body, thereby greatly increasing the vaporization rate of the water on the extruder body. Since vaporization absorbs heat, the cooling efficiency is greatly improved, providing guarantee for the normal operation of the extruder body 2. Description of the Drawings

[0024] Figure 1It is a schematic structural diagram of an embodiment of the cooling system for a closed large-diameter extruder.

[0025] Figure 2 It is a schematic structural diagram of another angle of an embodiment of the cooling system for a closed large-diameter extruder.

[0026] Figure 3 It is a schematic structural diagram of yet another angle of an embodiment of the cooling system for a closed large-diameter extruder.

[0027] Figure 4 It is Figure 2 an enlarged structural diagram of part A in

[0028] Figure 5 It is Figure 2 an enlarged structural diagram of part B in

[0029] Figure 6 It is a schematic structural diagram of the conduction structure in an embodiment of the cooling system for a closed large-diameter extruder.

[0030] Figure 7 It is a schematic structural diagram of the transmission component in an embodiment of the cooling system for a closed large-diameter extruder.

[0031] Figure 8 It is a schematic internal structure diagram of the cylinder in an embodiment of the cooling system for a closed large-diameter extruder.

[0032] In the figure: 1. Base; 2. Extruder body; 3. First ring; 4. Second ring; 5. Bidirectional lead screw; 6. Rotating shaft; 7. Rotating tube; 8. First transmission belt; 9. Transverse moving plate; 10. Sprayer; 11. Through hole; 12. Gear; 13. Second transmission belt; 14. Long rod; 15. Cylinder; 16. Piston disc; 17. Push-pull rod; 18. Protruding part; 19. Connecting plate; 20. Cylindrical spring; 21. Connecting rod; 22. Inclined rod; 23. Check valve; 24. Pulley; 25. Water pump; 26. First connecting pipe; 27. Second connecting pipe; 28. Annular groove. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] In addition, an element in the present invention is referred to as being "fixed to" or "disposed on" another element, and it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0035] Please refer to Figure 1-8 , in an embodiment of the present invention, a cooling system for a closed large-diameter extruder includes a base 1 and an extruder body 2 fixedly installed on the base 1. It further includes a first ring 3, and two are movably provided on the base 1, and the two first rings 3 are symmetrically disposed on the outer periphery of the extruder body 2 and coincide with the central axis of the extruder body 2, and are connected to an opposite transverse movement mechanism installed on the base 1;

[0036] A spray head 10 is movably disposed on the inner wall of the first ring 3 and is connected to a water pumping mechanism and an air pumping mechanism installed on the base 1 through a rotating mechanism. The opposite transverse movement mechanism is used to drive the two first rings 3 to move closer to or away from each other along the axial direction of the extruder body 2 and drive the spray head 10 to rotate along the outer periphery of the extruder body 2;

[0037] Wherein, the water pumping mechanism works when the two first rings 3 move closer to each other to cause the spray head 10 to perform a water spraying action on the extruder body 2, and the air pumping mechanism works when the two first rings 3 move away from each other and causes the spray head 10 to perform a blowing action on the extruder body 2.

[0038] In actual use, when the opposite transverse movement mechanism works, it will drive the two first rings 3 to move closer to or away from each other. At the same time, the opposite transverse movement mechanism can drive the rotating mechanism to move, and the rotating mechanism drives the spray head 10 to perform a circular motion along the circumferential direction of the extruder body 2. When the two first rings 3 move closer to each other, the water pumping mechanism works, causing the spray head 10 to spray water on the extruder body 2 to cool the extruder body 2. During the process of the two first rings 3 moving away from each other, the water pumping mechanism stops working and the air pumping mechanism works, causing the spray head 10 to blow air on the extruder body 2, thereby greatly increasing the gasification rate of the water on the extruder body 2. Since gasification absorbs heat, the cooling efficiency is greatly improved, providing guarantee for the normal operation of the extruder body 2.

[0039] It should be noted that during actual use, the temperature of the water sprayed onto the extruder body 2 should be controlled. If the water temperature is too high, the cooling effect will be poor; if the temperature is too low, the state of the raw materials inside the extruder body 2 will be affected.

[0040] Please refer to again Figure 1 , the opposite transverse movement mechanism includes a bidirectional lead screw 5 rotatably installed on the base 1, two transverse plates 9 symmetrically arranged on the bidirectional lead screw 5, and a driving motor installed on one side of the base 1. One end of the bidirectional lead screw 5 is connected to the output end of the driving motor. The two transverse plates 9 are threadedly connected to the bidirectional lead screw 5, and the two first rings 3 are respectively fixedly installed on the two transverse plates 9.

[0041] It should be noted that in order to achieve the mutual approach or separation movement of the two first rings 3, the bidirectional lead screw 5 needs to rotate forward or backward. Therefore, the driving motor (not shown in the figure) is a forward and reverse motor, and a 4IK / 80YYJT model motor is used. This model of motor has stable performance. Other models of motors can also be used as long as they meet the driving requirements. This application does not make specific limitations in this regard;

[0042] Specifically, two sections of threads are symmetrically arranged on the bidirectional lead screw 5, and the two sections of threads have opposite helix directions. The bidirectional lead screw 5 passes through the two transverse plates 9, and holes for the bidirectional lead screw 5 to pass through are opened on the transverse plates 9. Threads engaging with the bidirectional lead screw 5 are provided on the inner walls of the holes.

[0043] Please refer to again Figure 4 , Figure 6 and Figure 7 , the rotation mechanism includes a transmission component installed on the base 1 and connected to the bidirectional lead screw 5, and a meshing structure connecting the transmission component and the first ring 3. The meshing structure includes a gear 12 rotatably installed on the transverse plate 9 and a second ring 4 rotatably installed in the first ring 3 in a sealed manner. A conduction structure is provided between the first ring 3 and the second ring 4. Tooth teeth are provided on the outer periphery of the second ring 4. The gear 12 meshes with the tooth teeth, and the rotation shaft of the gear 12 is connected to the transmission component.

[0044] The conduction structure includes an annular groove 28 opened on the inner wall of the first ring 3 and a through hole 11 opened on the second ring 4. The nozzle 10 is installed in the through hole 11 to form a passage for the water pumping mechanism to supply water to the nozzle 10 and the air pumping mechanism to supply air to the nozzle 10.

[0045] When the bidirectional lead screw 5 rotates forward or backward, causing the two transverse plates 9 to drive the two first rings 3 to move closer to or away from each other, the bidirectional lead screw 5 will drive the transmission assembly to move. Thus, the transmission assembly can drive the gear 12 to rotate. The gear 12 drives the second ring 4 through the teeth on the outer circumference of the second ring 4 to drive the spray head 10 to perform a circular motion within the first ring 3, realizing the function of the spray head 10 spraying water or blowing air in a circular pattern onto the extruder body 2, ensuring the uniformity of cooling of the extruder body 2;

[0046] As a comparison, if multiple spray heads 10 are arranged along the circumference on the inner wall of the first ring 3, it is also possible to achieve a comprehensive range of spraying water or blowing air onto the extruder body 2. However, with this arrangement method, a pump air mechanism or a pump water mechanism is required to supply water or air to multiple spray heads 10 simultaneously. Due to the differences in the orientations of the multiple spray heads 10, furthermore, there will be differences in the water output and air output of the multiple spray heads 10, and thus it is difficult to achieve the expected effect of the cooling zone function.

[0047] The transmission assembly includes a rotating shaft 6 rotatably installed on the base 1 and connected to the bidirectional lead screw 5 through a first transmission belt 8, and a rotating tube 7 rotatably installed on the transverse plate 9. The rotating tube 7 is slidably sleeved with the rotating shaft 6 through a limiting structure, and the rotating tube 7 is connected to the rotating shaft of the gear 12 through a second transmission belt 13;

[0048] The limiting structure includes two strip-shaped protrusions fixed on the outer circumference of the rotating shaft 6 and two strip-shaped grooves opened on the inner wall of the rotating tube 7. The strip-shaped grooves are slidably adapted to the strip-shaped protrusions, and both are parallel to the central axes of the rotating shaft 6 and the rotating tube 7.

[0049] When the bidirectional lead screw 5 rotates, it will drive the rotating shaft 6 to rotate through the first transmission belt 8. Furthermore, the rotating shaft 6 drives the rotating tube 7 to rotate through the strip-shaped protrusions on its outer wall and the strip-shaped grooves on the inner wall of the rotating tube 7. Correspondingly, the rotating tube 7 drives the gear 12 to rotate through the second transmission belt 13, causing the second ring 4 to drive the spray head 10 to perform a circular motion within the first ring 3 around the extruder body 2, ensuring the comprehensiveness of water pumping and air blowing.

[0050] The pump water mechanism includes a water pump 25 and a cylinder 15 installed on the base 1. The water outlet of the water pump 25 is connected to the first ring 3 through a first connecting pipe 26. Two one-way valves 23 are provided on the outer circumference of the cylinder 15, and one of the one-way valves 23 is connected to the first ring 3 through a second connecting pipe 27. An elastic suction assembly cooperating with the transverse plate 9 is installed inside the cylinder 15.

[0051] It should be noted that, due to the movement of the first ring 3 and the second ring 4, the first connecting pipe 26 and the second connecting pipe 27 are both flexible pipes. In addition, in order to prevent water from entering the second connecting pipe 27 or gas from entering the first connecting pipe 26, check valves are installed at the joints of the first connecting pipe 26 and the second connecting pipe 27 with the first ring 3, which plays a role in separating gas and liquid.

[0052] Please refer to again Figure 8 , the elastic suction assembly includes a piston disk 16 sealingly and slidably arranged in the cylinder 15, two push rods 17 fixedly installed on the piston disk 16, and two convex parts 18 fixedly arranged on the outer wall of the cylinder 15 and slidably connected with the two push rods 17. The two push rods 17 are arranged in a "U" shape, and a connecting plate 19 is fixedly connected to the ends of the two push rods 17 away from the piston disk 16. A rolling cooperation structure is connected between the connecting plate 19 and the transverse movement plate 9. A cylindrical spring 20 is sleeved around the outer circumference of each of the two push rods 17. One end of the cylindrical spring 20 is connected to the connecting plate 19, and the other end is connected to the convex part 18.

[0053] The rolling cooperation structure includes an inclined rod 22 fixedly connected to the connecting plate 19 through a connecting rod 21, a long rod 14 fixedly installed on the side of the transverse movement plate 9 facing the cylinder 15, and a pulley 24 rotatably installed at the end of the long rod 14 away from the transverse movement plate 9, and the pulley 24 abuts against the inclined rod 22.

[0054] When the two transverse movement plates 9 move closer to each other (that is, the first ring 3 moves towards the midpoint of the extruder body 2, and the water pump 25 pumps water to the nozzle 10), the long rod 14 and the pulley 24 move horizontally with the transverse movement plate 9, and the pulley 24 and the inclined rod 22 perform rolling cooperation, so that the inclined rod 22 will be displaced accordingly. Correspondingly, the inclined rod 22 drives the piston disk 16 to slide upward in the cylinder 15 through the connecting rod 21, the connecting plate 19 and the push rod 17. During this process, the check valve 23 connected to the second connecting pipe 27 is not conducting, while the other check valve 23 is conducting. Thus, air is sucked into the cylinder 15. At the same time, the two push rods 17 slide upward on the convex part 18, and the cylindrical spring 20 is compressed;

[0055] Subsequently, when the two transverse plates 9 move away from each other, the water pump 25 stops working. During this process, the cylindrical spring 20 gradually rebounds and resets. Accordingly, the tilting rod 22 moves downward and maintains abutment with the pulley 24. The piston disc 16 slides downward in the cylinder 15, and the one-way valve 23 connected to the second connecting pipe 27 is connected, and the other one-way valve 23 is not connected. Therefore, the gas in the cylinder 15 is discharged and sprayed onto the extruder body 2 through the nozzle 10, which greatly improves the vaporization rate of water on the extruder body 2. Since vaporization absorbs heat, the cooling efficiency is greatly improved.

[0056] When the closed large-diameter extruder cooling system is implemented, when the driving motor drives the bidirectional screw 5 to rotate forward or reversely, the two transverse plates 9 are simultaneously threadedly matched with the bidirectional screw 5 to move closer to or away from each other;

[0057] In the process of the two transverse plates 9 driving the two first circular rings 3 to move toward or away from each other, the bidirectional screw 5 will drive the rotating shaft 6 to rotate through the first transmission belt 8, and then the rotating shaft 6 will drive the rotating tube 7 to rotate through the strip protrusions on its outer wall and the strip grooves on the inner wall of the rotating tube 7. Correspondingly, the rotating tube 7 drives the gear 12 to rotate through the second transmission belt 13, so that the second circular ring 4 drives the nozzle 10 to make a circular motion around the extruder body 2 in the first circular ring 3 to ensure the comprehensiveness of water pumping and air blowing. At the same time, the water pump 25 works to pump water to the first circular ring 3 through the first connecting pipe 26, so that the nozzle 10 sprays water to the extruder body 2 during the rotation and movement;

[0058] When the two transverse plates 9 move toward each other (i.e., the first ring 3 moves toward the midpoint of the extruder body 2, and the water pump 25 pumps water to the nozzle 10), the long rod 14 and the pulley 24 move horizontally following the transverse plate 9, and the pulley 24 and the tilting rod 22 perform rolling cooperation, so that the tilting rod 22 gives way. Accordingly, the tilting rod 22 drives the piston disc 16 to slide upward in the cylinder 15 through the connecting rod 21, the connecting plate 19 and the push-pull rod 17. During this process, the one-way valve 23 connected to the second connecting pipe 27 is not conductive, while the other one-way valve 23 is conductive, so that air is sucked into the cylinder 15. At the same time, the two push-pull rods 17 slide upward on the protrusion 18, and the columnar spring 20 is compressed.

[0059] Subsequently, when the two transverse plates 9 move away from each other, the water pump 25 stops working. During this process, the cylindrical spring 20 gradually rebounds and resets. Accordingly, the tilting rod 22 moves downward and maintains abutment with the pulley 24. The piston disc 16 slides downward in the cylinder 15, and the one-way valve 23 connected to the second connecting pipe 27 is connected, and the other one-way valve 23 is not connected. Therefore, the gas in the cylinder 15 is discharged and sprayed onto the extruder body 2 through the nozzle 10, which greatly improves the vaporization rate of water on the extruder body 2. Since vaporization absorbs heat, the cooling efficiency is greatly improved.

[0060] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0061] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A cooling system for a closed large-diameter extruder, comprising a base (1) and an extruder body (2) fixedly installed on the base (1), characterized in that, It further includes: Two first rings (3) are movably arranged on the base (1), and the two first rings (3) are symmetrically arranged on the outer periphery of the extruder body (2), coincide with the central axis of the extruder body (2), and are connected to the opposite transverse movement mechanism installed on the base (1); A nozzle (10) is movably arranged on the inner wall of the first ring (3), and is connected to a water pump mechanism and an air pump mechanism installed on the base (1) through a rotating mechanism. The opposite transverse movement mechanism is used to drive the two first rings (3) to move closer to or away from each other along the axial direction of the extruder body (2), and drive the nozzle (10) to rotate along the outer periphery of the extruder body (2); Wherein, the water pump mechanism works when the two first rings (3) approach each other, so as to prompt the nozzle (10) to perform a water spraying action on the extruder body (2), and the air pump mechanism works when the two first rings (3) move away from each other, and prompts the nozzle (10) to perform a blowing action on the extruder body (2); The opposite transverse movement mechanism includes a bidirectional screw rod (5) rotatably installed on the base (1), two transverse movement plates (9) symmetrically arranged on the bidirectional screw rod (5), and a driving motor installed on one side of the base (1); Wherein, one end of the bidirectional screw rod (5) is connected to the output end of the driving motor, the two transverse movement plates (9) are threadedly connected to the bidirectional screw rod (5), and the two first rings (3) are respectively fixedly installed on the two transverse movement plates (9); The water pump mechanism includes a water pump (25) and a cylinder (15) installed on the base (1). The water outlet of the water pump (25) is connected to the first ring (3) through a first connecting pipe (26). Two one-way valves (23) are arranged on the outer periphery of the cylinder (15), and one of the one-way valves (23) is connected to the first ring (3) through a second connecting pipe (27). An elastic suction assembly cooperating with the transverse movement plate (9) is installed in the cylinder (15).

2. The closed large-caliber extruder cooling system according to claim 1, wherein The rotating mechanism includes a transmission component installed on the base (1) and connected to the bidirectional screw rod (5), and a meshing structure connecting the transmission component and the first ring (3). The meshing structure includes a gear (12) rotatably installed on the transverse movement plate (9) and a second ring (4) sealed and rotatably installed in the first ring (3); Wherein, a conduction structure is arranged between the first ring (3) and the second ring (4). Teeth are arranged on the outer periphery of the second ring (4). The gear (12) meshes with the teeth, and the rotating shaft of the gear (12) is connected to the transmission component.

3. The closed large-diameter extruder cooling system according to claim 2, characterized in that, The conduction structure includes an annular groove (28) opened on the inner wall of the first ring (3) and a through hole (11) opened on the second ring (4). The nozzle (10) is installed in the through hole (11) to form a path for supplying water from the water pump mechanism to the nozzle (10) and supplying air from the air pump mechanism to the nozzle (10).

4. A closed large-diameter extruder cooling system according to claim 2, wherein, The transmission assembly includes a rotating shaft (6) rotatably mounted on the base (1) and connected to the bidirectional lead screw (5) through a first transmission belt (8), and a rotating tube (7) rotatably mounted on the transverse movement plate (9). The rotating tube (7) is slidably sleeved with the rotating shaft (6) through a limiting structure, and the rotating tube (7) is connected to the rotating shaft of the gear (12) through a second transmission belt (13); The limiting structure includes two strip-shaped protrusions fixed on the outer periphery of the rotating shaft (6) and two strip-shaped grooves formed on the inner wall of the rotating tube (7). The strip-shaped grooves are slidably adapted to the strip-shaped protrusions, and both are parallel to the central axis of the rotating shaft (6) and the rotating tube (7).

5. The cooling system of a closed large-diameter extruder according to claim 1, characterized in that, The elastic suction assembly includes a piston disk (16) sealingly and slidably disposed in the cylinder (15), two push rods (17) fixedly installed on the piston disk (16), and two protrusion parts (18) fixedly disposed on the outer wall of the cylinder (15) and slidably connected to the two push rods (17); Among them, the two push rods (17) are arranged in a "U" shape, and a connecting plate (19) is fixedly connected to the ends of the two push rods (17) far from the piston disk (16). A rolling cooperation structure is connected between the connecting plate (19) and the transverse movement plate (9); A cylindrical spring (20) is sleeved on the outer periphery of each of the two push rods (17). One end of the cylindrical spring (20) is connected to the connecting plate (19), and the other end is connected to the protrusion part (18).

6. The cooling system of a closed large-diameter extruder according to claim 5, characterized in that, The rolling cooperation structure includes an inclined rod (22) fixedly connected to the connecting plate (19) through a connecting rod (21), a long rod (14) fixedly installed on the side of the transverse movement plate (9) facing the cylinder (15), and a pulley (24) rotatably installed at the end of the long rod (14) far from the transverse movement plate (9), and the pulley (24) abuts against the inclined rod (22).

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