All-plastic composite hose welding jet type cooling system and method thereof

Abstract

The invention relates to an all-plastic composite hose welding jet type cooling system and a method thereof. The all-plastic composite hose welding jet type cooling system comprises a cooling block main part, the cooling block main part is arranged on one side of a steel belt and provided with a cooling cavity used for inputting high-pressure cooling airflow. A spraying groove is formed in the side wall of the cooling block main part in the axial direction and connected to the cooling cavity; the spraying grooves are arranged corresponding to the steel belt and used for spraying the high-pressure cooling air flow of the cooling cavity to the steel belt, and a layer of air cushion is formed between the steel belt and the cooling block main piece. Compared with a solid indirect cooling mode in the prior art, the cooling effect of the steel strip is greatly improved by adopting a gas direct cooling mode. After the high-pressure cooling airflow is jetted on the steel belt, a layer of air cushion is formed between the steel belt and the cooling block main part, the air cushion can effectively reduce friction between the steel belt and the cooling block while rapidly cooling the steel belt, the production speed of the all-plastic composite hose does not need to be reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of composite pipe welding cooling, in particular to a full-plastic composite hose welding spray-type cooling system and a method thereof. Background Art

[0002] The current composite pipe welding cooling system is a traditional direct contact cooling method, which is developed based on the production of aluminum-plastic hoses. The aluminum-plastic composite sheet hose does not require too high welding energy during side seam welding. The heat generated during the welding process is not high, and strong cooling capacity is not required to meet the full-speed production of aluminum-plastic composite sheets.

[0003] Different from the side seam of aluminum-plastic composite sheet, the metal layer in the middle of aluminum-plastic sheet can react with high frequency heating at the same time during welding, and the inside of sheet will also be heated synchronously. When welding the side seam of all-plastic composite sheet, because there is no metal layer in the sheet, there is almost no high frequency heating reaction in the sheet, and the side seam fusion can only be welded by heat transfer of steel belt. The welding energy required for the welding process is at least twice that of aluminum-plastic composite sheet, so the heat generated is also at least twice that of aluminum-plastic composite sheet. After welding, the steel belt needs to be quickly cooled to avoid process defects in all-plastic composite hose. Under such requirements, the cooling method of the prior art is to cool the steel belt by metal cooling block. In order to avoid friction between the metal cooling block and the steel belt, a layer of Teflon needs to be set between the metal cooling block and the steel belt. When cooling, the metal cooling block is directly cooled by cooling water, and then the metal cooling block conducts the low temperature to Teflon, and then the Teflon conducts to the steel belt.

[0004] It has the following technical problems: The cooling block indirectly cools the steel strip through Teflon, resulting in large energy transfer losses and low cooling efficiency, which cannot meet the full-speed production of all-plastic composite sheets. In order to meet product quality requirements, the production speed can only be reduced. According to the type and thickness of the all-plastic composite sheet, the equipment speed needs to be reduced by 10%-40% compared to the rated speed, which seriously affects work efficiency. Summary of the invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a full-plastic composite hose welding spray-type cooling system and method thereof, which can enhance the cooling effect and improve the work efficiency.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: A spray-type cooling system for welding of an all-plastic composite hose, used for cooling a steel strip in welding of an all-plastic composite hose, comprises a cooling block main part; The main cooling block is arranged on one side of the steel belt and is provided with a cooling cavity for inputting high-pressure cooling airflow; The side wall of the cooling block main part is provided with a spray groove along the axial direction, and the spray groove is connected to the cooling cavity; The spray slots are arranged corresponding to the steel strip and are used to spray the high-pressure cooling airflow of the cooling chamber onto the steel strip and form an air cushion between the steel strip and the cooling block main part.

[0007] Furthermore, a cold water core is coaxially arranged in the cooling chamber, and a water inlet and a water outlet are respectively connected to both ends of the cold water core, and the diameter of the water inlet is larger than the diameter of the water outlet; the cold water core is arranged in the cooling chamber, and an annular gas channel is arranged between the outer wall of the cold water core and the inner wall of the cooling chamber, and the cooling block main part is provided with an air inlet for inputting compressed gas, and the air inlet, the annular gas channel and the injection slot are connected in sequence, wherein the compressed gas is cooled by the cold water core to form a high-pressure cooling airflow.

[0008] Furthermore, the cooling chamber includes a first cooling chamber and a second cooling chamber which are arranged in parallel and interconnected, and the cold water core includes a first cold water core and a second cold water core, and the first cold water core and the second cold water core are respectively and one-to-one built into the first cooling chamber and the second cooling chamber, the air inlet is connected to the first cooling chamber, the injection groove is connected to the second cooling chamber, one end of the first cold water core and the second cold water core are respectively connected to the water inlet, and the other end of the first cold water core and the second cold water core are respectively connected to the water outlet.

[0009] Furthermore, the air inlet is arranged in the middle of the cooling block main part, a connecting groove is arranged between the ends of both sides of the first cooling cavity and the second cooling cavity, and the annular gas channel is connected to the connecting groove.

[0010] Furthermore, a left end cover and a right end cover are respectively provided on both sides of the cooling block main part. The left end cover is arranged on the left side of the first cold water core and the second cold water core, and the right end cover is arranged on the right side of the first cold water core and the second cold water core. The water inlet, the right end cover, the first cold water core and the second cold water core, the left end cover, and the water outlet are connected in sequence.

[0011] Furthermore, two ends of the first cold water core and the second cold water core are respectively provided with cross-shaped water through holes, and the cross-shaped water through holes are connected to the left end cover and the right end cover.

[0012] Furthermore, the cross section of the injection slot gradually increases from the inside to the outside.

[0013] Furthermore, the cross section of the injection slot is an inverted V shape.

[0014] Furthermore, a contact plane is provided on the side of the left end cover and the right end cover facing the steel strip, and the contact planes of the left end cover and the right end cover are respectively sealed against the steel strip, and the injection slot is located between the two contact planes.

[0015] A method for welding a spray-type cooling system of an all-plastic composite hose comprises the following steps: Arrange the spray slots of the cooling block main part corresponding to the steel belt; A high-pressure cooling airflow is input into the cooling cavity of the cooling block main part, and the high-pressure cooling airflow is ejected from the ejection slot of the cooling block main part and then ejected onto the steel belt, forming an air cushion between the steel belt and the cooling block main part.

[0016] In general, the present invention has the following advantages: The high-pressure cooling airflow is directly sprayed onto the steel strip, and the high-speed airflow can take away the heat of the steel strip more quickly than contact with a fixed cooling block. Since there is no need to pass through the intermediate Teflon tape for low-temperature transfer, the energy transfer loss is reduced. Compared with the prior art that uses solid indirect cooling, the present invention uses gas direct cooling to greatly improve the cooling effect of the steel strip. After the high-pressure cooling airflow is sprayed onto the steel strip, a layer of air cushion is formed between the steel strip and the main part of the cooling block. The air cushion can quickly cool the steel strip while effectively reducing the friction between the steel strip and the cooling block. Therefore, there is no need to reduce the production speed of the all-plastic composite hose, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of the spray cooling system of this embodiment.

[0018] Figure 2 It is a schematic diagram of the top structure of the spray-type cooling system of this embodiment.

[0019] Figure 3 for Figure 1 AA view in.

[0020] Figure 4 for Figure 1 BB view in.

[0021] Figure 5 for Figure 3 The enlarged schematic diagram is at H in FIG.

[0022] Figure 6 It is a schematic diagram of the structure of the first cold water core.

[0023] Figure 7 It is a side view schematic diagram of the first cold water core.

[0024] In the figure: 1- cooling block main part, 11- air inlet, 12- injection slot; 2-left end cover, 21-water outlet; 3-right end cover, 31-water inlet; 41-first cooling chamber, 42-second cooling chamber; 51-first cold water core, 52-second cold water core; 6- communication groove; 7-Cross-shaped water outlet. DETAILED DESCRIPTION

[0025] The present invention (spray type cooling system) is suitable for cooling and shaping (controlling the appearance of the hose side seam and the roundness of the hose after welding) and speeding up of the all-plastic composite hose during the welding process.

[0026] The present invention will be described in further detail below.

[0027] like Figure 1 , Figure 2 , Figure 5 As shown, a full-plastic composite hose welding spray-type cooling system is used to cool the steel strip in the full-plastic composite hose welding, including a cooling block main part 1, a left end cover 2, a right end cover 3, a cold water core and a control device.

[0028] The cooling block main part 1 is arranged on one side of the steel belt and is provided with a cooling cavity for inputting high-pressure cooling airflow; The side wall of the cooling block main part 1 is provided with a spraying groove 12 along the axial direction, and the spraying groove 12 is connected to the cooling cavity; The spraying slots 12 are arranged corresponding to the steel strip, and are used to spray the high-pressure cooling airflow in the cooling chamber onto the steel strip, and form an air cushion between the steel strip and the cooling block main part 1 .

[0029] During operation, the high-pressure cooling airflow is directly sprayed onto the steel strip, and the high-speed airflow can take away the heat of the steel strip more quickly than contact with a fixed cooling block. Since there is no need to pass through the intermediate Teflon for low-temperature transfer, the energy transfer loss is reduced. Compared with the prior art that uses solid indirect cooling, the present invention uses gas direct cooling to greatly improve the cooling effect of the steel strip. After the high-pressure cooling airflow is sprayed onto the steel strip, a layer of air cushion is formed between the steel strip and the cooling block main part 1. The air cushion can not only quickly cool the steel strip, but also effectively reduce the friction between the steel strip and the cooling block, thereby extending the service life of the steel strip. Therefore, there is no need to reduce the production speed of the all-plastic composite hose, thereby improving work efficiency.

[0030] Specifically, a cold water core is coaxially arranged in the cooling chamber, and the two ends of the cold water core are respectively connected with a water inlet 31 and a water outlet 21; a narrow annular gas channel is arranged between the outer wall of the cold water core and the inner wall of the cooling chamber, and the cooling block main component 1 is provided with an air inlet 11 for inputting compressed gas, and the air inlet 11, the annular gas channel and the injection groove 12 are connected in sequence, wherein the compressed gas input from the cooling block main component 1 is cooled by the cold water core to form a high-pressure cooling airflow.

[0031] The narrow annular gas channel can ensure that the compressed air and the cold water core are in full and uniform contact. The inner diameter of the cold water core is made as large as possible while ensuring the strength of the cold water core, and the wall thickness is made as thin as possible. A larger inner diameter can accommodate more cooling water, and more cooling water will bring better cooling effect. Thinner wall thickness is more conducive to heat exchange between cooling water and compressed air.

[0032] In order to ensure that the cooling water maintains a certain pressure in the cold water core, the diameter of the water inlet 31 is set larger than the diameter of the water outlet 21. The water flow generates pressure due to the throttling effect. The water pressure can ensure that the cooling water in the cold water core is in more complete contact with the cold water core, thereby improving the cooling effect of the cold water core on the compressed gas, and thereby improving the cooling effect of the steel strip.

[0033] like Figure 3 , Figure 4 As shown, the cooling chamber and the cold water core can be set in multiple stages as needed. In this embodiment, a two-stage design is adopted, the cooling chamber includes a first cooling chamber 41 and a second cooling chamber 42 arranged in parallel and interconnected, the cold water core includes a first cold water core 51 and a second cold water core 52, the first cold water core 51 and the second cold water core 52 are respectively built-in in the first cooling chamber 41 and the second cooling chamber 42 in a one-to-one correspondence, the air inlet 11 is connected to the first cooling chamber 41, the injection slot 12 is connected to the second cooling chamber 42, one end of the first cold water core 51 and the second cold water core 52 are respectively connected to the water inlet 31, and the other end of the first cold water core 51 and the second cold water core 52 are respectively connected to the water outlet 21. Through two-stage cooling, the temperature of the high-pressure cooling airflow is further reduced, which is conducive to improving the cooling effect on the steel strip.

[0034] like Figure 6 It is a schematic structural diagram of the first cold water core 51 , and the second cold water core 52 has the same structure as the first cold water core 51 .

[0035] The air inlet 11 is arranged in the middle of the cooling block main part 1, and a connecting groove 6 is arranged between the ends of both sides of the first cooling chamber 41 and the second cooling chamber 42, and the annular gas channel is connected to the connecting groove 6. After the compressed gas enters the middle of the first cooling chamber 41 from the air inlet 11, it is diverted to both sides of the first cooling chamber 41 along the annular gas channel on the first cold water core 51. During the diversion process, the compressed gas exchanges heat with the first cold water core 51 for cooling, and then enters the second cooling chamber 42 through the connecting grooves 6 on the left and right sides respectively, and flows around the second cold water core 52 along the annular gas channel on the second cold water core 52. During the flow process, the compressed gas further exchanges heat with the second cold water core 52 for cooling, and finally the high-pressure cooling airflow after two-stage cooling is sprayed onto the steel strip by the spraying groove 12. The compressed gas is branched from the middle of the first cooling chamber 41 to both sides and flows around the first cold water core 51, and then flows around the second cold water core 52. Not only is a high-pressure cooling airflow obtained through continuous cooling, but the compressed gas can also be disturbed so that the high-pressure cooling airflow can be more evenly sprayed onto the long steel strip, resulting in a more balanced cooling effect and less prone to process defects.

[0036] The left end cover 2 and the right end cover 3 are respectively provided on both sides of the cooling block main part 1. The left end cover 2 is provided on the left side of the first cold water core 51 and the second cold water core 52, and the right end cover 3 is provided on the right side of the first cold water core 51 and the second cold water core 52. The water inlet 31 is provided on the right end cover 3, and the water outlet 21 is provided on the left end cover 2. The water inlet 31, the flow channel of the right end cover 3, the first cold water core 51 and the second cold water core 52, the flow channel of the left end cover 2, and the water outlet 21 are connected in sequence. After the cooling water flows in from the water inlet 31, it is divided by the right end cover 3 and flows into the first cold water core 51 and the second cold water core 52 respectively. After flowing through the first cold water core 51 and the second cold water core 52, it merges through the left end cover 2 and finally flows out through the water outlet 21. By continuously inputting the flowing cooling water, the first cold water core 51 and the second cold water core 52 can maintain a strong cooling capacity, which is conducive to the high-pressure cooling airflow to ensure the cooling effect of the steel strip.

[0037] In order to maintain good sealing performance between the cold water core and the left end cover 2 and the right end cover 3 to prevent water leakage, an O-ring sealing position is designed at each end of the two cold water cores. Figure 7 As shown, the two ends of the first cold water core 51 and the second cold water core 52 are respectively provided with a cross-shaped water opening 7, and the cross-shaped water opening 7 is connected to the left end cover 2 and the right end cover 3. The cross-shaped water opening 7 can not only ensure the smooth flow of cooling water at the connection between the cold water core and the end cover, but also prevent impurities in the water from accumulating and clogging here to affect the cooling effect.

[0038] like Figure 5As shown, the cross section of the injection slot 12 gradually increases from the inside to the outside. Preferably, the cross section of the injection slot 12 is an inverted V-shaped, presenting a duckbill shape. Due to the high-frequency heating of the steel strip, only the area with a width of about 1.5mm in the middle of the steel strip is heated, which is the core area that needs to be cooled. Therefore, at the center of the contact surface between the cooling block main part 1 and the steel strip, a 0.5mm wide injection slot 12 that runs through the cooling block main part 1 is processed on the cooling block main part 1 by wire cutting. The injection slot 12 completely cuts the second cooling cavity 42, and with the narrow groove as the center, connects an inverted V-shaped duckbill cold air spray cavity with the same length as the narrow groove. The cross-sectional width of the duckbill is 1.5mm, and the angle is 120°. The 1.5mm wide cold air spray cavity of the duckbill just acts directly on the high-temperature area with a width of 1.5mm in the middle of the steel strip, which has the effect of local concentrated cooling and improves the cooling efficiency of the steel strip.

[0039] The left end cover 2 and the right end cover 3 are provided with contact planes on the side facing the steel belt, and the contact planes of the left end cover 2 and the right end cover 3 are respectively sealed against the steel belt, and the injection slot 12 is located between the two contact planes. Specifically, because the cooling block main part 1 will always be pressed against the steel belt by a certain pressure in the working state, the two sides of the duckbill can relatively ensure that the airflow will not be completely leaked, and at the same time, it is necessary to prevent the compressed air from leaking from the end faces on both sides of the duckbill. Therefore, the left end cover 2 and the right end cover 3 at both ends of the main part are designed to face the steel belt on the side facing the steel belt. The purpose is to form a complete plane in front, behind, left and right of the duckbill, which not only ensures that the compressed air will not be directly leaked to ensure the maximum cooling effect, but also can generate a layer of air cushion between the steel belt and the cooling block main part 1, effectively reducing the friction between the steel belt and the cooling block main part 1, improving the cooling effect of the steel belt and extending the service life of the steel belt.

[0040] The cooling block requires good thermal conductivity and relatively high hardness, so the cooling block main part 1 and the cold water core are made of high thermal conductivity copper alloy with the grade of Ampcoloy 940. Because there are cylindrical sealing positions and water pipe joint threads on the two end covers, the end covers are made of 304 stainless steel with higher corrosion resistance and strength.

[0041] The compressed air pressure of the cooling block needs to set different injection pressures for different types of sheets, so a pressure regulating valve is installed at the air inlet end to adjust the required pressure according to different sheets. In order to make the equipment more energy-efficient, after the equipment stops, the cooling water circulation and compressed air injection need to be stopped to achieve the purpose of energy saving. Therefore, an electromagnetic switch is added to the cooling water circuit and the equipment is stopped and started. When the equipment is running, the electromagnetic switch is turned on to connect the cooling water. After the equipment stops, the electromagnetic switch is closed to turn off the cooling water. In order to always maintain a good cooling effect, the cooling water in the cooling block needs to maintain pressure at all times, so the electromagnetic valve is installed at the water outlet. Compressed air needs to be installed at the air inlet end. The heat of the steel belt is very high during the operation of the equipment. After the equipment stops, the heat on the steel belt cannot be dissipated immediately, so when the equipment stops, the electromagnetic switch needs to be closed for 2 seconds. The purpose of this design is to allow the steel belt to continue to cool down to a reasonable temperature after the equipment stops running, and then cut off the cooling water and compressed air.

[0042] A method for welding a spray-type cooling system of an all-plastic composite hose comprises the following steps: Arrange the spray slots 12 of the cooling block main part 1 corresponding to the steel strip; A high-pressure cooling airflow is input into the cooling cavity of the cooling block main component 1 , and the high-pressure cooling airflow is ejected from the ejection slot 12 of the cooling block main component 1 and then sprayed onto the steel belt, forming an air cushion between the steel belt and the cooling block main component 1 .

[0043] Due to the limitation of installation size and installation position, the design of the new cooling block must maintain the original outer dimensions. The new cooling block adopts the design that the left end cover 2 and the right end cover 3 are clamped on the left and right sides of the cooling block main part 1. The water inlet and outlet holes need to be connected to the original inlet and outlet pipes, so the center distance between the water inlet and outlet holes must remain unchanged. Under this premise, the sealing performance of the left end cover 2, the right end cover 3 and the cold water core interface is guaranteed at the same time. Based on the heat exchange requirements and the cooling block strength requirements, two cooling chambers are designed in the cooling block main part 1. Each cooling chamber is a through hole with a diameter of 10mm. A 2mm*8mm connecting groove 6 is opened on both sides of the two cooling chambers. Figure 3 As shown, the two cooling chambers are connected in series. After the cooling chambers are connected in series, the length of the cooling channel can be increased, so that the compressed air can maintain a sufficient contact time with the cold water core in the cooling chamber, thereby ensuring that the cooling effect is maximized: the compressed air enters the first cooling chamber 41 through the air inlet 11, flows to both sides along the annular gas channel to the connecting groove 6, and then turns downward to the second cooling chamber 42 after passing through the connecting groove 6. The compressed air is further cooled in the second cooling chamber 42, and finally sprayed onto the steel strip in contact with it through the linear duckbill spray groove 12, so that the steel strip is cooled quickly.

[0044] After actual production test: When producing PBL all-plastic sheet products, the speed is increased from 25m / min to 33m / min. The speed is increased by 32% compared with the previous one. When producing high-gloss all-plastic sheet products, the speed is increased from 20m / min to 25m / min. The speed is increased by about 25% compared with the previous one.

[0045] The hose ovality can be controlled at the same level as before the speed increase even when the production speed is significantly increased. It does not become more serious due to the increase in production speed. The service life of the steel belt has increased from an average of 15 hours per belt to 27 hours per belt, and the life of each steel belt has increased by approximately 80%.

[0046] When producing 360° printed products, the ink cracks at the edges are also reduced by about 20% compared to before.

[0047] The present invention adopts a novel cooling spray combination structure: compressed air and cooling water are combined, and the cooling water cools the compressed air. The cooled compressed air is directly sprayed onto the steel strip through a specially designed nozzle to cool the steel strip. At the same time, the compressed air sprayed in this process will form a layer of air cushion on the surface of the steel strip to reduce friction. Experimental results show that the cooling effect of the new cooling system is about 30-35% higher than that of the original cooling solution.

[0048] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A spray cooling system for all-plastic composite hose welding, used for cooling the steel strip in all-plastic composite hose welding, characterized by: Including cooling block main part; The main cooling block is arranged on one side of the steel belt and is provided with a cooling cavity for inputting high-pressure cooling airflow; The side wall of the cooling block main part is provided with a spray groove along the axial direction, and the spray groove is connected to the cooling cavity; The spray slots are arranged corresponding to the steel strip and are used to spray the high-pressure cooling airflow of the cooling chamber onto the steel strip and form an air cushion between the steel strip and the cooling block main part.

2. The all-plastic composite hose welding spray type cooling system according to claim 1, characterized in that: A cold water core is coaxially arranged in the cooling chamber, and a water inlet and a water outlet are respectively connected to both ends of the cold water core, and the diameter of the water inlet is larger than the diameter of the water outlet; the cold water core is arranged in the cooling chamber, and an annular gas channel is arranged between the outer wall of the cold water core and the inner wall of the cooling chamber, and the cooling block main part is provided with an air inlet for inputting compressed gas, and the air inlet, the annular gas channel and the injection slot are connected in sequence, wherein the compressed gas is cooled by the cold water core to form a high-pressure cooling airflow.

3. The all-plastic composite hose welding spray type cooling system according to claim 2 is characterized in that: The cooling chamber includes a first cooling chamber and a second cooling chamber that are arranged in parallel and interconnected, and the cold water core includes a first cold water core and a second cold water core. The first cold water core and the second cold water core are respectively and one-to-one built into the first cooling chamber and the second cooling chamber, the air inlet is connected to the first cooling chamber, the injection slot is connected to the second cooling chamber, one end of the first cold water core and the second cold water core are respectively connected to the water inlet, and the other end of the first cold water core and the second cold water core are respectively connected to the water outlet.

4. The all-plastic composite hose welding spray type cooling system according to claim 3 is characterized in that: The air inlet is arranged in the middle of the cooling block main part, a connecting groove is arranged between the ends of both sides of the first cooling cavity and the second cooling cavity, and the annular gas channel is connected to the connecting groove.

5. The all-plastic composite hose welding spray type cooling system according to claim 3 is characterized in that: A left end cover and a right end cover are respectively provided on both sides of the cooling block main part. The left end cover is arranged on the left side of the first cold water core and the second cold water core, and the right end cover is arranged on the right side of the first cold water core and the second cold water core. The water inlet, the right end cover, the first cold water core and the second cold water core, the left end cover, and the water outlet are connected in sequence.

6. The all-plastic composite hose welding spray type cooling system according to claim 5, characterized in that: Two ends of the first cold water core and the second cold water core are respectively provided with cross-shaped water through holes, and the cross-shaped water through holes are connected to the left end cover and the right end cover.

7. The all-plastic composite hose welding spray type cooling system according to claim 1, characterized in that: The cross section of the injection slot gradually increases from the inside to the outside.

8. The all-plastic composite hose welding spray type cooling system according to claim 7, characterized in that: The cross section of the injection slot is an inverted V shape.

9. The all-plastic composite hose welding spray type cooling system according to claim 6, characterized in that: A contact plane is provided on the side of the left end cover and the right end cover facing the steel belt. The contact planes of the left end cover and the right end cover are respectively sealed against the steel belt, and the injection slot is located between the two contact planes.

10. A method for welding a spray-type cooling system of an all-plastic composite hose according to any one of claims 1 to 9, characterized in that: The following steps are included: Arrange the spray slots of the cooling block main part corresponding to the steel belt; A high-pressure cooling airflow is input into the cooling cavity of the cooling block main part, and the high-pressure cooling airflow is ejected from the ejection slot of the cooling block main part and then ejected onto the steel belt, forming an air cushion between the steel belt and the cooling block main part.

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