Injection type cooling system for welding of all-plastic composite hose

Abstract

The utility model relates to an all-plastic composite hose welding jet type cooling system which comprises a cooling block main piece. 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 belt 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 utility model relates to composite pipe welding cooling technical field, concretely is a kind of full plastic composite hose welding injection type cooling system. BACKGROUND

[0002] Current composite pipe welding cooling system is the traditional direct contact type cooling mode, such cooling mode is developed based on production aluminum plastic hose, aluminum plastic composite sheet hose does not need too high welding energy when edge seam welding, the heat generated in welding process is not high, and strong cooling capacity is not needed, that is, it can meet the full-speed production of aluminum plastic composite sheet.

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

[0004] It has the following technical problems:

[0005] The cooling block indirectly cools the steel belt through Teflon, and the energy transfer loss is large, the cooling efficiency of the cooling method is low, and the full-speed production of the device cannot meet the full plastic composite sheet. In order to meet the product quality, the production speed can only be reduced. According to the type and thickness of the full plastic composite sheet, the speed of the device needs to be reduced by 10%-40% than the rated speed, which seriously affects the work efficiency. UTILITY MODEL CONTENTS

[0006] In view of the problems existing in the prior art, the purpose of the utility model is to provide a full plastic composite hose welding injection type cooling system, which can improve the cooling effect and improve the work efficiency.

[0007] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0008] A full plastic composite hose welding injection type cooling system is used for cooling steel belt in full plastic composite hose welding, comprising a cooling block main part;

[0009] The cooling block main body is arranged on one side of the steel strip and is provided with a cooling cavity for inputting high-pressure cooling gas flow;

[0010] The side wall of the cooling block main body is provided with a spray groove in the axial direction, and the spray groove is connected to the cooling cavity.

[0011] The spray groove is arranged corresponding to the steel strip and is used for spraying the high-pressure cooling gas flow from the cooling cavity to the steel strip, and forms an air cushion between the steel strip and the cooling block main body.

[0012] Further, a cold water core is coaxially arranged in the cooling cavity, and the cold water core is respectively connected with an inlet and an outlet at two ends, and the diameter of the inlet is larger than that of the outlet; the cold water core is arranged in the cooling cavity, and an annular gas passage is arranged between the outer wall of the cold water core and the inner wall of the cooling cavity; the cooling block main body is provided with an air inlet for inputting compressed gas, and the air inlet, the annular gas passage and the spray groove are sequentially connected, wherein the compressed gas is cooled by the cold water core to form high-pressure cooling gas flow.

[0013] Further, the cooling cavity comprises a first cooling cavity and a second cooling cavity arranged in parallel and connected with each other, and the cold water core comprises a first cold water core and a second cold water core, the first cold water core and the second cold water core are respectively arranged in the first cooling cavity and the second cooling cavity one by one, the air inlet is connected to the first cooling cavity, the spray groove is connected to the second cooling cavity, one end of the first cold water core and the second cold water core is respectively connected to the inlet, and the other end of the first cold water core and the second cold water core is respectively connected to the outlet.

[0014] Further, the air inlet is arranged in the middle of the cooling block main body, a communication groove is arranged between the two ends of the first cooling cavity and the second cooling cavity, and the annular gas passage is connected to the communication groove.

[0015] Further, the cooling block main body is respectively provided with a left end cover and a right end cover on two sides, the left end cover is arranged on the left side of the first cold water core and the second cold water core, the right end cover is arranged on the right side of the first cold water core and the second cold water core, the inlet, the right end cover, the first cold water core and the second cold water core, the left end cover and the outlet are sequentially connected.

[0016] Further, the two ends of the first cold water core and the second cold water core are respectively provided with a cross-shaped water inlet, and the cross-shaped water inlet is connected to the left end cover and the right end cover.

[0017] Further, the cross section of the spray groove gradually increases from inside to outside.

[0018] Further, the cross section of the spray groove is inverted V-shaped.

[0019] Further, the side of the left end cover and the right end cover facing the steel strip is respectively provided with a contact plane, the contact planes of the left end cover and the right end cover are respectively sealed and abutted to the steel strip, and the spray groove is located between the two contact planes.

[0020] A method for welding and spraying type cooling system of a full plastic composite hose, comprising the following steps,

[0021] The spraying groove of the cooling block main part is arranged corresponding to the steel belt;

[0022] The high-pressure cooling gas flow is input into the cooling cavity of the cooling block main part, and after being sprayed from the spraying groove of the cooling block main part, the high-pressure cooling gas flow is sprayed on the steel belt, thereby forming an air cushion between the steel belt and the cooling block main part.

[0023] In general, the utility model has the following advantages:

[0024] The high-pressure cooling gas flow is directly sprayed on the steel belt, and the high-speed gas flow can more quickly take away the heat of the steel belt compared with the fixed cooling block. Since low-temperature transmission through the intermediate Teflon adhesive tape is not needed, energy transmission loss is reduced, and compared with the solid indirect cooling mode of the prior art, the air direct cooling mode of the utility model greatly improves the cooling effect of the steel belt. After the high-pressure cooling gas flow is sprayed on the steel belt, an air cushion is formed between the steel belt and the cooling block main part, and the air cushion can effectively reduce the friction between the steel belt and the cooling block while quickly cooling the steel belt, so that the production speed of the full plastic composite hose is not needed to be reduced, and the work efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structure schematic view of the spraying type cooling system of the embodiment.

[0026] Figure 2 It is a top view structure schematic view of the spraying type cooling system of the embodiment.

[0027] Figure 3 It is Figure 1 A-A view in FIG.

[0028] Figure 4 It is Figure 1 B-B view in FIG.

[0029] Figure 5 It is Figure 3 Enlarged schematic view of H in FIG.

[0030] Figure 6 It is a structure schematic view of the first cold water core.

[0031] Figure 7 It is a side view schematic view of the first cold water core.

[0032] In the figure:

[0033] 1-cooling block main part, 11-air inlet, 12-spraying groove;

[0034] 2-left end cover, 21-water outlet;

[0035] 3-Right end cap, 31-Water inlet;

[0036] 41 - First cooling chamber, 42 - Second cooling chamber;

[0037] 51 - First cooling water core, 52 - Second cooling water core;

[0038] 6-Connecting slot;

[0039] 7- Cross-shaped water inlet. Detailed Implementation

[0040] This utility model (jet cooling system) is applicable to the cooling and shaping (controlling the appearance of the hose seam and the roundness of the hose after welding) and speeding up the welding process of all-plastic composite hoses.

[0041] The present invention will now be described in further detail.

[0042] like Figure 1 , Figure 2 , Figure 5 As shown, a spray-type cooling system for welding all-plastic composite hoses is used to cool the steel strip in the welding of all-plastic composite hoses. It includes a cooling block main component 1, a left end cap 2, a right end cap 3, a cold water core, and a control device, etc.

[0043] The main component of the cooling block 1 is arranged on one side of the steel strip and is provided with a cooling chamber for inputting high-pressure cooling airflow;

[0044] The cooling block main component 1 has an axially arranged spray groove 12 on its side wall, and the spray groove 12 is connected to the cooling cavity;

[0045] The spray groove 12 is arranged corresponding to the steel strip and is used to spray the high-pressure cooling airflow of the cooling chamber onto the steel strip, forming an air cushion between the steel strip and the main cooling block 1.

[0046] During operation, high-pressure cooling airflow is directly sprayed onto the steel strip. This high-speed airflow removes heat from the steel strip more quickly than contact with a fixed cooling block. Since it eliminates the need for intermediate Teflon for temperature transfer, energy loss is reduced. Compared to existing technologies using solid-state indirect cooling, this invention significantly improves the cooling effect of the steel strip through direct gas cooling. After the high-pressure cooling airflow is sprayed onto the steel strip, an air cushion is formed between the steel strip and the main cooling block 1. This air cushion not only rapidly cools the steel strip but also effectively reduces friction between the steel strip and the cooling block, extending the service life of the steel strip. Therefore, there is no need to reduce the production speed of the all-plastic composite hose, thus improving work efficiency.

[0047] Specifically, the cooling cavity is coaxially provided with a cold water core, and the cold water core is respectively connected with a water inlet 31 and a water outlet 21 at two ends; a narrow annular gas passage is arranged between the outer wall of the cold water core and the inner wall of the cooling cavity, and the cooling block main part 1 is provided with an air inlet 11 for inputting compressed gas, and the air inlet 11, the annular gas passage and the jet groove 12 are sequentially connected, wherein the compressed gas input from the cooling block main part 1 is cooled by the cold water core to form a high-pressure cooling gas flow.

[0048] The narrow annular gas passage can ensure that the compressed air and the cold water core are fully and uniformly contacted. In the case of ensuring the strength of the cold water core, the inner diameter of the cold water core is made as large as possible and the wall thickness is made as thin as possible. The larger inner diameter can accommodate more cooling water, and more cooling water will bring better cooling effect. The thinner wall thickness is more conducive to heat exchange between the cooling water and the compressed air.

[0049] 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 to be larger than the diameter of the water outlet 21. The water flow generates pressure due to the throttling effect, and the water pressure can ensure that the cooling water in the cold water core and the cold water core are more fully contacted, thereby improving the cooling effect of the cold water core on the compressed gas, and further improving the cooling effect of the steel belt.

[0050] As shown in Figure 3 , Figure 4 , the cooling cavity and the cold water core can be provided with multiple stages as needed. In this embodiment, two-stage design is adopted, and the cooling cavity includes a first cooling cavity 41 and a second cooling cavity 42 arranged in parallel and connected with each other, and 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 and one-to-one arranged in the first cooling cavity 41 and the second cooling cavity 42, the air inlet 11 is connected to the first cooling cavity 41, the jet groove 12 is connected to the second cooling cavity 42, one end of the first cold water core 51 and the second cold water core 52 is 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 is respectively connected to the water outlet 21. Through two-stage cooling, the temperature of the high-pressure cooling gas flow is further reduced, which is beneficial to improve the cooling effect on the steel belt.

[0051] As shown in Figure 6 , it is a structural schematic view of the first cold water core 51, and the second cold water core 52 adopts the same structure as the first cold water core 51.

[0052] The air inlet 11 is arranged in the middle of the cooling block main part 1, and the communication grooves 6 are arranged between the two side ends of the first cooling cavity 41 and the second cooling cavity 42, and the annular gas passages are connected to the communication grooves 6. After the compressed gas enters the middle of the first cooling cavity 41 from the air inlet 11, the compressed gas is divided into two flows along the annular gas passages on the first cooling core 51 to the two sides of the first cooling cavity 41, and the compressed gas is cooled by heat exchange with the first cooling core 51 in the process of being divided into two flows, and then enters the second cooling cavity 42 through the left and right communication grooves 6, respectively, and flows around the second cooling core 52 along the annular gas passages on the second cooling core 52, and the compressed gas is further cooled by heat exchange with the second cooling core 52 in the process of flowing, and finally the high-pressure cooling gas flow cooled by two-stage cooling is sprayed onto the steel strip through the spray grooves 12. The compressed gas is divided into two flows from the middle of the first cooling cavity 41 to the two sides and flows around the first cooling core 51, and then flows around the second cooling core 52. Not only the high-pressure cooling gas flow is obtained by continuous cooling, but also the compressed gas is disturbed, so that the high-pressure cooling gas flow can be sprayed more uniformly onto the long strip-shaped steel strip, and the cooling effect is more balanced, and process defects are less likely to occur.

[0053] The left end cover 2 and the right end cover 3 are arranged on the two sides of the cooling block main part 1, the left end cover 2 is arranged on the left side of the first cooling core 51 and the second cooling core 52, the right end cover 3 is arranged on the right side of the first cooling core 51 and the second cooling core 52, the water inlet 31 is arranged on the right end cover 3, the water outlet 21 is arranged on the left end cover 2, and the water inlet 31, the flow channel of the right end cover 3, the first cooling core 51 and the second cooling 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 through the water inlet 31, the cooling water is divided into two flows through the right end cover 3, and then flows into the first cooling core 51 and the second cooling core 52, respectively. After flowing through the first cooling core 51 and the second cooling core 52, the cooling water is combined into one flow through the left end cover 2, and finally flows out through the water outlet 21. By continuously inputting the flowing cooling water, the first cooling core 51 and the second cooling core 52 can maintain strong cooling capacity, which is beneficial to the high-pressure cooling gas flow to ensure the cooling effect of the steel strip.

[0054] In order to maintain good sealing performance between the cooling water core and the left end cover 2 and the right end cover 3 without water leakage, an O-ring sealing position is designed on each end of the two cooling water cores. As shown in Figure 7 The two ends of the first cooling core 51 and the second cooling core 52 are respectively provided with cross-shaped water inlets 7 connected to the left end cover 2 and the right end cover 3. The cross-shaped water inlets 7 can not only ensure the smooth flow of the cooling water at the connection between the cooling water core and the end cover, but also prevent the accumulation of impurities in the water at this position to affect the cooling effect.

[0055] As shown in Figure 5As shown, the cross section of the spray groove 12 gradually increases from inside to outside. Preferably, the cross section of the spray groove 12 is inverted V-shaped, presenting a duckbill shape. Since only a region of about 1.5 mm in width in the middle of the steel strip is heated when the steel strip is heated at high frequency, which is the core zone that needs to be cooled, a 0.5 mm wide spray groove 12 is cut through the cooling block main piece 1 at the center of the contact surface of the cooling block main piece 1 and the steel strip by wire cutting, the spray groove 12 completely cuts the second cooling cavity 42, and a duckbill-shaped cold air spray cavity with the same length as the slot is connected as the center of the slot, the cross-sectional width of the duckbill is 1.5 mm, and the included angle is 120°. The 1.5 mm wide cold air spray cavity of the duckbill directly acts on the 1.5 mm wide high temperature region in the middle of the steel strip, which has the effect of local concentrated cooling and improves the cooling efficiency of the steel strip.

[0056] The left end cover 2 and the right end cover 3 are provided with contact planes on the side facing the steel strip, and the contact planes of the left end cover 2 and the right end cover 3 are respectively sealed against the steel strip, and the spray groove 12 is located between the two contact planes. Specifically, since the cooling block main piece 1 is always pressed against the steel strip by a certain pressure in the working state, the airflow on both sides of the duckbill can be ensured not to be completely leaked, and at the same time, the compressed air is prevented from leaking from the end faces on both sides of the duckbill, therefore, the side of the left end cover 2 and the right end cover 3 facing the steel strip is designed as a plane, the purpose is to form a complete plane in front of, behind, left and right of the duckbill, not only to ensure that the compressed air is not directly leaked to maximize the cooling effect, but also to generate an air cushion between the steel strip and the cooling block main piece 1, effectively reducing the friction between the steel strip and the cooling block main piece 1, improving the cooling effect of the steel strip and prolonging the service life of the steel strip.

[0057] The cooling block needs good thermal conductivity and relatively high hardness, so the cooling block main piece 1 and the cold water core are made of high thermal conductivity alloy copper material with Ampcoloy940 brand. Since the two end covers have cylindrical sealing positions and water pipe joint threads, the end covers are made of 304 stainless steel material with higher corrosion resistance and strength.

[0058] The compressed air pressure of the cooling block needs to set different injection pressure for different types of sheet, so the pressure regulating valve is installed at the air inlet end, and the required pressure is adjusted according to different sheet. In order to save energy, the cooling water circulation and compressed air injection need to be stopped when the equipment stops, so as to achieve the purpose of energy saving, so an electromagnetic switch is added in the cooling water circuit and the equipment stop linkage, the electromagnetic switch is opened when the equipment runs, the cooling water is turned on, the electromagnetic switch is closed when the equipment stops, the cooling water is turned off, and the cooling water in the cooling block needs to maintain pressure at all times in order to maintain good cooling effect, so the electromagnetic valve is installed at the water outlet end. Compressed air needs to be installed with electromagnetic switch and equipment linkage at the air inlet end. The heat of the steel belt is very high during the operation of the equipment, and the heat on the steel belt cannot be dissipated immediately after the equipment stops, so the electromagnetic switch needs to be closed for 2 seconds after the equipment stops. The purpose of this design is to allow the steel belt to continue cooling after the equipment stops running so that it can be cooled to a reasonable temperature before the cooling water and compressed air are turned off.

[0059] A method for welding and spraying type cooling system of full plastic composite hose, comprising the following steps,

[0060] The spraying groove 12 of the cooling block main part 1 is arranged corresponding to the steel belt;

[0061] High-pressure cooling gas flow is input to the cooling cavity of the cooling block main part 1, and after the high-pressure cooling gas flow is sprayed from the spraying groove 12 of the cooling block main part 1, it is sprayed on the steel belt, forming an air cushion between the steel belt and the cooling block main part 1.

[0062] Due to the limitation of installation size and installation position, the design of the new cooling block must maintain the original size, the new cooling block adopts the design of left end cover 2 and right end cover 3 clamped on the left and right sides of the cooling block main part 1, the water inlet hole and the water outlet hole need to be connected with the original water inlet and outlet pipes, so the center distance of the water inlet hole and the water outlet hole must be kept unchanged, and at the same time, the sealing performance of the left end cover 2, the right end cover 3 and the cold water core interface must be ensured. Based on the heat exchange demand and the cooling block strength demand, two cooling cavities are designed in the cooling block main part 1, each cooling cavity is a through hole with a diameter of 10mm, and a communication groove 6 with a size of 2mm*8mm is opened on both sides of each cooling cavity, as shown in Figure 3 The two cooling cavities are connected in series, and the length of the cooling channel is increased after the connection of the two cooling cavities, so that the compressed air can maintain sufficient contact time with the cold water core in the cooling cavity, and the cooling effect is maximized. The compressed air enters the first cooling cavity 41 through the air inlet 11, flows to both sides along the annular gas channel, passes through the communication groove 6, and then turns downward to the second cooling cavity 42. The compressed air is further cooled in the second cooling cavity 42, and finally sprayed onto the steel belt in contact with it through the linear duckbill spraying groove 12, so that the steel belt is quickly cooled.

[0063] Actual production test:

[0064] The speed was increased from 25 m / min to 33 m / min when producing PBL all-plastic sheet products. The speed was increased by 32% compared to before. The speed was increased from 20 m / min to 25 m / min when producing high-brightness all-plastic sheet products. The speed was increased by about 25% compared to before.

[0065] The hose ovality could be controlled at the same level before the speed was increased, and did not become serious because of the production speed increase

[0066] The service life of the steel belt was increased from an average of 15 hours per strip to 27 hours per strip, and the service life of each steel belt was increased by about 80%.

[0067] When producing 360° printed products, the edge seam ink cracks were also reduced by about 20% compared to before.

[0068] The utility model discloses a novel cooling injection combined structure: compressed air and cooling water are combined, and the compressed air is cooled and temperature-reduced by cooling water, and the temperature-reduced compressed air is directly injected to the steel belt through the specially designed nozzle to cool the steel belt, and the injected compressed air forms an air cushion on the surface of the steel belt to reduce the friction in the process. Experimental results show that the cooling effect of the new cooling system is increased by about 30-35% compared to the original cooling scheme.

[0069] The above embodiment is a preferred embodiment of the utility model, but the embodiment of the utility model is not limited by the above embodiment, and any change, modification, replacement, combination, simplification, which does not deviate from the spirit and principle of the utility model, should be an equivalent replacement mode, and all are included in the protection scope of the utility model.

Claims

1. A spray-type cooling system for welding all-plastic composite hoses, used for cooling the steel strip during welding of all-plastic composite hoses, characterized in that: Including the main cooling block component; The main cooling block is arranged on one side of the steel strip and is equipped with a cooling chamber for inputting high-pressure cooling airflow; The main component of the cooling block has spray grooves along the axial direction on its side wall, and the spray grooves are connected to the cooling chamber; The spray grooves 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, forming an air cushion between the steel strip and the main cooling block.

2. The all-plastic composite flexible hose welding spray cooling system according to claim 1, characterized in that: A cold water core is coaxially arranged inside the cooling chamber. The two ends of the cold water core are connected to an inlet and an outlet, respectively. The diameter of the inlet is larger than that of the outlet. The cold water core is located inside the cooling chamber. An annular gas channel is provided between the outer wall of the cold water core and the inner wall of the cooling chamber. The main component of the cooling block is provided with an air inlet for inputting compressed gas. The air inlet, the annular gas channel and the spray groove are connected in sequence. The compressed gas forms a high-pressure cooling airflow after being cooled by the cold water core.

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

4. The all-plastic composite flexible hose welding spray cooling system according to claim 3, characterized in that: The air inlet is located in the middle of the main cooling block component, and a connecting groove is provided between the two ends of the first and second cooling chambers, with an annular gas channel connected to the connecting groove.

5. The all-plastic composite flexible hose welding spray cooling system according to claim 3, characterized in that: The main cooling block has a left end cover and a right end cover on both sides. The left end cover is located on the left side of the first and second cooling water cores, and the right end cover is located on the right side of the first and second cooling water cores. The water inlet, the right end cover, the first and second cooling water cores, the left end cover, and the water outlet are connected in sequence.

6. The all-plastic composite flexible hose welding spray cooling system according to claim 5, characterized in that: The first and second cold water cores are respectively provided with cross-shaped water inlets at both ends, which are connected to the left end cover and the right end cover.

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

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

9. The all-plastic composite flexible hose welding spray cooling system according to claim 6, characterized in that: Both the left and right end caps have contact surfaces on the side facing the steel strip. The contact surfaces of the left and right end caps are sealed against the steel strip, and the spray groove is located between the two contact surfaces.

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