CN214820141U

CN214820141U - Cooling device of HDPE (high-density polyethylene) forming machine

Info

Publication number: CN214820141U
Application number: CN202121139065.6U
Authority: CN
Inventors: 李斌
Original assignee: Shanghai Fanshun New Pipeline Co ltd
Current assignee: Shanghai Fanshun New Pipeline Co ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-11-23
Anticipated expiration: 2031-05-25

Abstract

The application relates to the technical field of plastic processing equipment, in particular to a cooling device of an HDPE (high-density polyethylene) forming machine. A cooling device of an HDPE (high-density polyethylene) forming machine comprises a support frame, wherein a heat exchange water collecting tank is fixedly connected with the support frame, and the heat exchange water collecting tank is connected with a liquid cooling mechanism, a gas cooling mechanism and a blow-drying mechanism along the transmission direction of pipe fittings; the liquid cooling mechanism comprises a plurality of liquid cooling unit pieces, a cooling water storage tank and a centrifugal pump, wherein the liquid cooling unit pieces are connected to the heat exchange water collecting tank along the transmission direction of the pipe fitting; a flow guide gap is reserved between adjacent liquid cooling unit elements; the liquid inlet end of the centrifugal pump is communicated with the cooling water storage tank, and the liquid outlet end of the centrifugal pump is communicated with the liquid cooling unit. The application has better cooling forming effect, and can ensure the quality of HDPE products formed by cooling.

Description

Cooling device of HDPE (high-density polyethylene) forming machine

Technical Field

The application relates to the technical field of plastic processing equipment, in particular to a cooling device of an HDPE (high-density polyethylene) forming machine.

Background

High Density Polyethylene (HDPE) is thermoplastic polyolefin produced by ethylene copolymerization, has good wear resistance, electrical insulation, toughness, cold resistance and chemical stability at the use temperature of 100 ℃, is insoluble in any organic solvent, and resists corrosion of acid, alkali and various salts, so that the HDPE is widely used in the fields of gas delivery, water supply, pollution discharge, agricultural irrigation and the like. The equipment used for the production of high density polyethylene pipes is typically extrusion molding equipment, such as a twin screw extruder. The extrusion molding equipment comprises a main machine for extruding materials and an auxiliary machine for cutting, granulating and cooling molding. The auxiliary machine for cooling the formed pipeline is called a forming machine cooler, and cooling forming plays a key role in the quality of the pipeline.

Referring to fig. 1, a related art pipe cooling device includes a support frame 10, a cooling water tank 11 is fixedly connected to the support frame 10, and a length direction of the cooling water tank 11 is consistent with an orientation of an extrusion end of a main frame. The cooling water tank 11 stores cooling water to cool the pipeline. One end of the cooling water tank 11 facing the host extrusion end is communicated with a cold water inlet pipe 12, and one end of the cooling water tank 11 opposite to the host extrusion end is communicated with a heat exchange water outlet pipe 13.

In view of the above-described related art solutions, the inventors have found the following problems: the pipeline cooling device cools the pipeline by immersing the pipeline in cold water, is suitable for cooling the plastic with smaller pipe specification, but causes the deformation and bending of the product due to the buoyancy of water for large-size pipeline products, so that the structure and the performance of each part of the pipe fitting are uneven, and therefore, the related technology has the problem of relatively poor cooling and forming effect for the large-specification pipe.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the cooling forming effect of large-size pipes is relatively poor in the related art, the application aims to provide the cooling device of the HDPE forming machine.

The application purpose of the application is realized by the following technical scheme:

a cooling device of an HDPE (high-density polyethylene) forming machine comprises a support frame, wherein a heat exchange water collecting tank is fixedly connected with the support frame, and the heat exchange water collecting tank is connected with a liquid cooling mechanism, a gas cooling mechanism and a blow-drying mechanism along the transmission direction of pipe fittings; the liquid cooling mechanism comprises a plurality of liquid cooling unit pieces, a cooling water storage tank and a centrifugal pump, wherein the liquid cooling unit pieces are connected to the heat exchange water collecting tank along the transmission direction of the pipe fitting; a flow guide gap is reserved between adjacent liquid cooling unit elements; the liquid inlet end of the centrifugal pump is communicated with the cooling water storage tank, and the liquid outlet end of the centrifugal pump is communicated with the liquid cooling unit.

Through adopting above-mentioned technical scheme, wait that the cooling pipe spare loops through and adopts liquid cooling mechanism, air cooling mechanism and weathers the mechanism and carry out effective cooling for each part heat transfer of waiting to cool off the pipe spare is even relatively, makes this application have better cooling shaping effect, can guarantee the quality of cooling fashioned HDPE goods.

Preferably, the liquid cooling unit comprises a liquid cooling unit main body, and the geometric shape of the liquid cooling unit main body is a circular column; a water storage cavity is formed in the liquid cooling unit main body; the outer wall of the liquid cooling unit main body is fixedly communicated with a first water pipe; one end of the first water pipe is communicated with the water storage cavity, and the other end of the first water pipe is communicated with the centrifugal pump; the inner wall of the liquid cooling unit main body is fixedly communicated with a plurality of atomizing nozzles; the atomizing nozzle is communicated with the water storage cavity; the atomizer faces the central axis of the liquid cooling unit body.

Through adopting above-mentioned technical scheme, can promote the cooling effect of liquid cooling mechanism for treat that each part heat transfer of cooling tube spare is even relatively, guarantee the quality of product.

Preferably, the atomizing nozzles are distributed on the inner wall of the liquid cooling unit main body in a dot matrix manner; the distance between the adjacent atomizing spray heads is equal.

Through adopting above-mentioned technical scheme, further promote the cooling effect of liquid cooling mechanism, guarantee to treat each partial heat transfer homogeneity of cooling tube spare, guarantee the quality of product.

Preferably, the air cooling mechanism comprises an air cooling unit main body and a liquid nitrogen storage tank, and the air cooling unit main body is in a circular column in geometric shape; the air cooling unit main body is communicated with the liquid nitrogen storage tank; a gas storage cavity is formed in the gas cooling unit main body; the outer wall of the main body of the air cooling unit is fixedly communicated with a first air inlet pipe; one end of the first air inlet pipe is communicated with the air storage cavity, and the other end of the first air inlet pipe is communicated with the liquid nitrogen storage tank; a plurality of air outlet holes are formed in the inner wall of the air cooling unit main body; the air outlet hole is communicated with the air storage cavity; the air outlet hole faces the central axis of the air cooling unit main body.

By adopting the technical scheme, the cooling effect of the air cooling mechanism can be improved, and the product quality is ensured.

Preferably, the air outlet holes are distributed on the inner wall of the air cooling unit main body in a dot matrix manner; the distance between the adjacent air outlet holes is equal.

By adopting the technical scheme, the cooling effect of the air cooling mechanism is further improved, and the quality of the product is ensured.

Preferably, the inner wall of one end of the air outlet hole, which is far away from the air storage cavity, is detachably connected with an air flow disperser used for changing the trend of the air flow.

By adopting the technical scheme, the coverage of cooling gas can be improved, the overall cooling efficiency is improved, and the product quality is ensured.

Preferably, the airflow disperser comprises an airflow dispersing column, and one end of the airflow dispersing column facing the air storage cavity is coaxially provided with an air inlet groove; one end of the airflow dispersion column, which is back to the air storage cavity, is coaxially provided with a first air outlet duct; the first air outlet channel is communicated with the air inlet groove; one end of the airflow dispersion column, which is back to the air storage cavity, is provided with a plurality of second air outlet channels; the second air outlet duct is communicated with the air inlet groove; included angles formed by the central axes of the adjacent second air outlet channels are equal; the included angle formed by the central axis of the second air outlet channel and the central axis of the airflow dispersion column is an acute angle which is 30-60 degrees.

Through adopting above-mentioned technical scheme, can promote cooling gas's cooling coverage through first pore of giving vent to anger and second pore of giving vent to anger, improve holistic cooling efficiency, avoid atmospheric pressure too big influence pipeline quality simultaneously, can guarantee the quality of product.

Preferably, the bottom of the side wall of the heat exchange water collecting tank is communicated with an extraction pump, and the extraction pump is communicated with a storage tank; the storage tank is communicated with a cooling water generator; the cooling water generator is communicated with the cooling water storage tank.

Through adopting above-mentioned technical scheme, but the circulated use cooling water plays the purpose of water economy resource.

In summary, the present application has the following advantages:

1. this application has better cooling design effect, can guarantee the quality of cooling fashioned HDPE goods.

2. The gas flow disperser in this application can promote the gaseous coverage of cooling, and then promotes holistic cooling efficiency, guarantees the quality of product.

Drawings

Fig. 1 is a schematic view of an overall structure of a pipe cooling device in the related art.

Fig. 2 is a schematic view of the overall structure in embodiment 1 of the present application.

Fig. 3 is a vertical sectional view of a liquid-cooled unit piece of embodiment 1 in the present application.

Fig. 4 is a partially enlarged view of a portion a in fig. 3.

Fig. 5 is a schematic structural view of an air cooling mechanism according to embodiment 1 of the present application.

Fig. 6 is a partially enlarged view at B in fig. 5.

Fig. 7 is a schematic structural view of a blow drying mechanism according to embodiment 1 of the present application.

Fig. 8 is a schematic structural view of an air cooling mechanism in embodiment 2 of the present application.

Fig. 9 is a schematic structural view of the gas flow disperser in example 2 of the present application.

In the figure, 1, a heat exchange water collecting tank; 10. a support frame; 100. a chute; 101. a support plate; 102. a strut; 11. a cooling water tank; 12. a cold water inlet pipe; 13. a heat exchange water outlet pipe; 2. a liquid cooling mechanism; 20. a liquid cooling unit; 200. a flow guide gap; 201. a liquid cooling unit main body; 202. a water storage cavity; 203. a first water pipe; 204. an atomizing spray head; 205. a first connecting plate; 206. a first traveler; 21. a cooling water storage tank; 22. a centrifugal pump; 221. a second water pipe; 3. an air cooling mechanism; 30. a gas storage cavity; 31. an air-cooling unit main body; 310. an air outlet; 311. a second connecting plate; 312. a second strut; 32. a liquid nitrogen storage tank; 33. a first intake pipe; 4. a blow-drying mechanism; 41. drying the main body; 42. a third connecting plate; 43. a third strut; 44. a compressed air storage tank; 45. an air duct; 451. a pulse valve; 5. an air flow disperser; 51. an airflow dispersion column; 52. an air inlet groove; 53. a first air outlet duct; 54. a second air outlet duct; 6. a pump; 7. a storage tank; 8. a cooling water generator.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples.

Example 1:

referring to fig. 2, the cooling device for the HDPE molding machine disclosed in the present application comprises a support frame 10, wherein the support frame 10 comprises a support plate 101 and support rods 102, and the support rods 102 are welded at four corners of the lower surface of the support plate 101. The supporting plate 101 is fixedly connected with a heat exchange water collecting tank 1, and the heat exchange water collecting tank 1 is used for collecting heat exchange water. The vertical projection of the heat exchange water collection tank 1 is located within the vertical projection of the support plate 101.

Referring to fig. 2, in order to improve the cooling efficiency, the heat exchange water collecting tank 1 is connected with a liquid cooling mechanism 2, a gas cooling mechanism 3 and a blow-drying mechanism 4 along the transmission direction of the pipe fitting, the liquid cooling mechanism 2 cools the pipe fitting by using cooling water, the gas cooling mechanism 3 cools the pipe fitting by using low-temperature nitrogen, and the blow-drying mechanism 4 blows the surface of the pipe fitting cooled by the low-temperature nitrogen to be dried, so that the pipe fitting is convenient to transmit, cut and package. In order to promote water resource utilization rate, there is extraction pump 6 heat transfer water collecting vat 1 lateral wall bottom through the pipeline intercommunication, and extraction pump 6 has storage tank 7 through the fixed intercommunication of pipeline, and storage tank 7 has cooling water generator 8 through the fixed intercommunication of pipeline, and cooling water generator 8 is the cooling water refrigerator, and cooling water generator 8 is through the fixed intercommunication in cooling water storage tank 21 of pipeline.

Referring to fig. 2, the liquid cooling mechanism 2 comprises three liquid cooling unit pieces 20, a cooling water storage tank 21 and a centrifugal pump 22, wherein the three liquid cooling unit pieces 20 are slidably connected to the heat exchange water collection tank 1 along the transmission direction of the pipe fittings. A flow guide gap 200 is reserved between the adjacent liquid cooling unit pieces 20, and the heat exchange water can flow into the heat exchange water collecting tank 1 through the flow guide gap 200, so that the heat exchange water is recovered, and water resources are saved. The liquid outlet end of the centrifugal pump 22 is fixedly communicated with a first water pipe 203, and one end of the first water pipe 203, which is back to the centrifugal pump 22, is fixedly communicated with the liquid cooling unit 20. The liquid inlet end of the centrifugal pump 22 is fixedly communicated with a second water pipe 221, and one end of the second water pipe 221, which is back to the centrifugal pump 22, is fixedly communicated with the bottom side wall of the cooling water storage tank 21.

Referring to fig. 3, in conjunction with fig. 2, a single liquid cooling unit 20 includes a liquid cooling unit main body 201, two first connection plates 205, and two first sliding columns 206, the liquid cooling unit main body 201 is a circular column in geometry, the outer diameter of the liquid cooling unit main body 201 is 0.85 times the width of the heat exchange water collection tank 1, and the inner diameter of the liquid cooling unit main body 201 is 0.90 times the outer diameter of the liquid cooling unit main body 201. Two chutes 100 are formed in the upper surface of the heat exchange water collecting tank 1 along the length direction of the heat exchange water collecting tank 1, and the two chutes 100 are symmetrical about the vertical bisector of the heat exchange water collecting tank 1 along the length direction of the heat exchange water collecting tank 1.

Referring to fig. 4, with reference to fig. 3, the first connecting plates 205 are welded to the outer wall of the liquid cooling unit main body 201, and the two first connecting plates 205 are located in the same horizontal plane, that is, the two first connecting plates 205 are symmetrical with respect to the vertical bisector of the heat exchange water collection tank 1 along the length direction of the heat exchange water collection tank 1. A single first sliding column 206 is welded to an end surface of the single first connecting plate 205 facing away from the connection between the first connecting plate 205 and the liquid cooling unit main body 201, and the first sliding column 206 is slidably connected to the inside of the sliding groove 100, so that the liquid cooling unit main body 201 can move along the length direction of the heat exchange water collecting tank 1.

Referring to fig. 4 and fig. 2, a water storage cavity 202 is formed in the liquid cooling unit main body 201, and the geometric shape of the water storage cavity 202 is a torus. The first water pipe 203 is fixedly communicated with the outer wall of the liquid cooling unit main body 201, and the first water pipe 203 is communicated with the water storage cavity 202. A plurality of atomizing nozzles 204 communicated with the water storage cavity 202 are fixedly communicated with the inner wall of the liquid cooling unit main body 201. In order to ensure the cooling effect, each atomizer 204 faces the central axis of the liquid cooling unit main body 201, and the spraying direction of the atomizer 204 is perpendicular to the central axis of the liquid cooling unit main body 201. For further guaranteeing the cooling effect, atomizer 204 is the dot matrix and distributes in liquid cooling unit main part 201 inner wall, and the interval of adjacent atomizer 204 equals for cooling water can comparatively evenly spray in the surface of treating the cooling tube, and then promotes holistic cooling efficiency, guarantees the quality of product.

Referring to fig. 5, in combination with fig. 2, the air cooling mechanism 3 is used for assisting in cooling and forming the pipeline and drying moisture on the surface of the pipeline, so as to improve the drying efficiency of the subsequent drying mechanism 4. The air cooling mechanism 3 has a specific structure as follows, the air cooling mechanism 3 includes an air cooling unit main body 31, a liquid nitrogen storage tank 32, two second connecting plates 311 and two second sliding columns 312, and the liquid nitrogen storage tank 32 is fixedly communicated with a first air inlet pipe 33. One end of the first inlet pipe 33 is fixedly communicated with the liquid nitrogen storage tank 32 and the other end is fixedly communicated with the outer wall of the air cooling unit main body 31.

Referring to fig. 5 and 6, the air-cooling unit main body 31 is geometrically shaped as a circular column, the outer diameter of the air-cooling unit main body 31 is 0.85 times the width of the heat exchange water collection tank 1, and the inner diameter of the air-cooling unit main body 31 is 0.90 times the outer diameter of the liquid-cooling unit main body 201. The second connecting plates 311 are welded to the outer wall of the air cooling unit main body 31, and the two second connecting plates 311 are located in the same horizontal plane, that is, the two second connecting plates 311 are symmetrical with respect to the vertical bisector of the heat exchange water collection tank 1 along the length direction of the heat exchange water collection tank 1. A single second sliding column 312 is welded to an end surface of the single second connecting plate 311 opposite to the connection between the second connecting plate 311 and the air-cooling unit main body 31, and the second sliding column 312 is slidably connected in the chute 100, so that the air-cooling unit main body 31 can move along the length direction of the heat exchange water collecting tank 1.

Referring to fig. 5 and 6, the air-cooled unit main body 31 communicates with the liquid nitrogen storage tank 32 through a first intake pipe 33. The air-cooling unit main body 31 has an air storage cavity 30 formed therein, and the air storage cavity 30 is a circular cylinder in geometric shape. One end of the first air inlet pipe 33, which faces away from the liquid nitrogen storage tank 32, is fixedly communicated with the air storage cavity 30 of the air cooling unit main body 31. The inner wall of the air-cooling unit main body 31 is formed with a plurality of air outlet holes 310 communicated with the air storage cavity 30. The air outlet 310 faces the central axis of the air-cooling unit main body 31, and the central axis of the air outlet 310 is perpendicular to the central axis of the air-cooling unit main body 31. In order to ensure the air cooling effect, the air outlets 310 are distributed in a lattice manner on the inner wall of the air cooling unit main body 31, and the distances between adjacent air outlets 310 are equal.

Referring to fig. 7, in conjunction with fig. 2, the blow-drying mechanism 4 includes a blow-drying main body 41, two third connecting plates 42, two third sliding columns 43, and a compressed air tank 44. The blow-drying body 41 has the same structure as the air cooling unit body 31. The third connecting plate 42 is welded to the outer wall of the drying main body 41, and the two third connecting plates 42 are at the same level. Namely, the two third connecting plates 42 are symmetrical with respect to the vertical bisector of the heat exchange water collecting tank 1 in the length direction of the heat exchange water collecting tank 1. A single third sliding column 43 is welded to an end surface of the single third connecting plate 42 opposite to the connection between the third connecting plate 42 and the drying main body 41, and the third sliding column 43 is slidably connected in the sliding groove 100 so that the drying main body 41 can move along the length direction of the heat exchange water collecting tank 1. The compressed air storage tank 44 is fixedly communicated with an air duct 45, and one end of the air duct 45, which is back to the compressed air storage tank 44, is fixedly communicated with the air storage cavity 30 of the blow-drying main body 41. The air duct 45 is fixedly communicated with a pulse valve 451.

The implementation principle of the embodiment is as follows: the pipeline to be cooled is sequentially subjected to water cooling reduction and shaping through the three liquid cooling unit parts 20, heat exchange water flows into the heat exchange water collecting tank 1 and can be pumped into the storage tank 7 under the action of the pumping pump 6, and the water in the storage tank 7 is cooled and input into the cooling water storage tank 21 under the action of the cooling water generator 8, so that the recycling of water resources is realized; the pipe cooled by the liquid cooling unit 20 enters the air cooling unit main body 31 to be cooled by nitrogen, further cooling and shaping are realized, the pipe cooled by the air cooling unit main body 31 enters the blow-drying mechanism 4 to blow-dry water drops and dust on the surface, and then the next working section can be carried out.

Example 2:

example 2 differs from example 1 in that: referring to fig. 8, an air diffuser 5 for changing the direction of the air flow is detachably connected to an inner wall of one end of the air outlet 310 of the air cooling unit main body 31 away from the air storage cavity 30.

Referring to fig. 9, in the specific structure of the air flow disperser 5, the air flow disperser 5 includes an air flow dispersing column 51, and the air flow dispersing column 51 is screwed to the air outlet 310 of the air cooling unit main body 31. An air inlet groove 52 is coaxially formed in one end of the airflow dispersion column 51 facing the air storage cavity 30, and the diameter of the air inlet groove 52 is equal to 0.9 time of that of the airflow dispersion column 51.

Referring to fig. 9, a first air outlet channel 53 communicated with the air inlet groove 52 is coaxially formed at one end of the airflow dispersion column 51 facing away from the air storage cavity 30. The diameter of the first outlet channels 53 is between 0.5 and 1.5mm, and the diameter of the first outlet channels 53 is preferably 0.8 mm. One end of the airflow dispersion column 51 facing away from the air storage cavity 30 is provided with a plurality of second air outlet channels 54 communicated with the air inlet groove 52. In order to ensure the overall cooling efficiency, included angles formed by the central axes of the adjacent second air outlet channels 54 are equal, the included angle formed by the central axis of the second air outlet channel 54 and the central axis of the airflow dispersion column 51 is an acute angle which is 30-60 degrees, and the aperture ratio of the airflow dispersion column 51 is 15-25%, preferably 18%.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A HDPE make-up machine cooling device, includes support frame (10), its characterized in that: the supporting frame (10) is fixedly connected with a heat exchange water collecting tank (1), and the heat exchange water collecting tank (1) is connected with a liquid cooling mechanism (2), a gas cooling mechanism (3) and a blow-drying mechanism (4) along the transmission direction of the pipe fitting; the liquid cooling mechanism (2) comprises a plurality of liquid cooling unit pieces (20), a cooling water storage tank (21) and a centrifugal pump (22), and the liquid cooling unit pieces (20) are connected to the heat exchange water collecting tank (1) along the transmission direction of the pipe fittings; a flow guide gap (200) is reserved between adjacent liquid cooling unit pieces (20); the liquid inlet end of the centrifugal pump (22) is communicated with the cooling water storage tank (21) and the liquid outlet end of the centrifugal pump (22) is communicated with the liquid cooling unit piece (20).

2. The HDPE molding machine cooling device of claim 1, wherein: the liquid cooling unit (20) comprises a liquid cooling unit main body (201), and the geometric shape of the liquid cooling unit main body (201) is a circular column; a water storage cavity (202) is formed in the liquid cooling unit main body (201); the outer wall of the liquid cooling unit main body (201) is fixedly communicated with a first water pipe (203); one end of the first water pipe (203) is communicated with the water storage cavity (202) and the other end is communicated with the centrifugal pump (22); a plurality of atomizing nozzles (204) are fixedly communicated with the inner wall of the liquid cooling unit main body (201); the atomizing nozzle (204) is communicated with the water storage cavity (202); the atomizing nozzle (204) faces the central axis of the liquid cooling unit main body (201).

3. The HDPE molding machine cooling device of claim 2, wherein: the atomizing nozzles (204) are distributed on the inner wall of the liquid cooling unit main body (201) in a dot matrix manner; the adjacent atomizing spray heads (204) are equally spaced.

4. The HDPE molding machine cooling device of claim 1, wherein: the air cooling mechanism (3) comprises an air cooling unit main body (31) and a liquid nitrogen storage tank (32), wherein the air cooling unit main body (31) is in a circular ring column in a geometric shape; the air cooling unit main body (31) is communicated with a liquid nitrogen storage tank (32); a gas storage cavity (30) is formed in the gas cooling unit main body (31); a first air inlet pipe (33) is fixedly communicated with the outer wall of the air cooling unit main body (31); one end of the first air inlet pipe (33) is communicated with the air storage cavity (30) and the other end is communicated with the liquid nitrogen storage tank (32); a plurality of air outlet holes (310) are formed in the inner wall of the air cooling unit main body (31); the air outlet (310) is communicated with the air storage cavity (30); the air outlet (310) faces the central axis of the air cooling unit main body (31).

5. The HDPE forming machine cooling device of claim 4, wherein: the air outlets (310) are distributed on the inner wall of the air cooling unit main body (31) in a dot matrix manner; the adjacent air outlet holes (310) are equally spaced.

6. The HDPE forming machine cooling device of claim 4, wherein: the inner wall of one end of the air outlet (310) far away from the air storage cavity (30) is detachably connected with an air flow disperser (5) used for changing the trend of the air flow.

7. The HDPE forming machine cooling device of claim 6, wherein: the air flow disperser (5) comprises an air flow dispersing column (51), and one end of the air flow dispersing column (51) facing the air storage cavity (30) is coaxially provided with an air inlet groove (52); one end of the airflow dispersion column (51) back to the air storage cavity (30) is coaxially provided with a first air outlet channel (53); the first air outlet channel (53) is communicated with the air inlet groove (52); one end of the airflow dispersion column (51) back to the air storage cavity (30) is provided with a plurality of second air outlet channels (54); the second air outlet channel (54) is communicated with the air inlet groove (52); included angles formed by the central axes of the adjacent second air outlet pore passages (54) are equal; the included angle formed by the central axis of the second air outlet pore passage (54) and the central axis of the airflow dispersion column (51) is an acute angle which is 30-60 degrees.

8. The HDPE molding machine cooling device of claim 1, wherein: the bottom of the side wall of the heat exchange water collecting tank (1) is communicated with an extraction pump (6), and the extraction pump (6) is communicated with a storage tank (7); the storage tank (7) is communicated with a cooling water generator (8); the cooling water generator (8) is communicated with the cooling water storage tank (21).