A gas-liquid balance cooling circulation system of a cable three-layer co-extrusion production line

Abstract

The present application relates to a kind of cable three-layer co-extrusion production line gas-liquid balance cooling circulation system, including the vertical setting and being used to cool cable gas cooling pipe and liquid cooling pipe, for the circulating gas supply device of cooling gas for gas cooling pipe, for the liquid supply device for providing cooling liquid to liquid cooling pipe, the liquid supply device includes the liquid storage pool for storing cooling liquid, the first water pump for pumping cooling liquid in liquid storage pool from the bottom of liquid cooling pipe to cooling pipe, first liquid outlet pipe and first liquid inlet pipe arranged at the top of liquid cooling pipe, the liquid storage tank communicated with first liquid outlet pipe, the second liquid outlet pipe for connecting liquid storage tank and liquid storage pool arranged at the bottom of liquid storage tank, the second water pump for pumping cooling liquid in liquid storage tank to first liquid inlet pipe, liquid level sensor arranged in liquid cooling pipe, controller for receiving liquid level sensor signal and controlling the start-stop of second water pump.The present application can effectively balance the pressure between cooling gas and cooling liquid, so as to maintain the height of cooling liquid.

Description

Technical Field

[0001] This invention relates to the field of cable cooling systems, and in particular to a gas-liquid balance cooling circulation system for a three-layer co-extrusion production line for cables. Background Technology

[0002] Chinese patent CN103366897B discloses a VCV vertical L-type chemical cross-linked cable production process and a support tower. When the cable is first produced, it needs to be cooled and shaped, so there needs to be enough space for the cable to cool. At the same time, in order to reduce the impact of the cable's own weight on the cable, a support tower is adopted so that the cable has enough height to cool after production.

[0003] To improve the cooling efficiency of the cable, interconnected air-cooled pipes and liquid-cooled pipes are installed on the support tower. The cable is rapidly cooled by injecting cooling gas and cooling liquid into the air-cooled pipes and liquid-cooled pipes, respectively. However, in the actual cooling process, the pressure between the cooling gas and the cooling liquid cannot be effectively balanced, which makes it impossible to maintain the height of the cooling liquid. Once the height of the cooling liquid is not high enough, the cooling effect of the cable will be poor, and it will not be able to cool and harden before winding, causing the cable to be deformed during winding. Summary of the Invention

[0004] This application provides a gas-liquid balance cooling circulation system for a three-layer co-extrusion production line for cables, which can effectively balance the pressure between cooling gas and coolant, thereby maintaining the coolant level and ensuring the cooling effect of the cooling system on the cables.

[0005] The gas-liquid balance cooling circulation system for a three-layer co-extrusion cable production line provided in this application adopts the following technical solution: A gas-liquid balance cooling circulation system for a three-layer co-extrusion production line for cables includes vertically arranged air-cooling pipes and liquid-cooling pipes for cooling the cables, a circulating gas supply device for providing cooling gas to the air-cooling pipes, and a liquid supply device for providing cooling liquid to the liquid-cooling pipes. The liquid supply device includes a storage tank for storing the coolant, a first water pump for pumping the coolant from the storage tank from the bottom of the liquid-cooling pipes into the liquid-cooling pipes, a first outlet pipe and a first inlet pipe located at the top of the liquid-cooling pipes, a storage tank connected to the first outlet pipe, and a second outlet pipe located at the bottom of the storage tank for connecting the storage tank and the storage tank, for pumping the coolant from the storage tank to the first inlet pipe. The system includes a second water pump, a liquid level sensor located inside the liquid cooling pipe, and a controller for receiving signals from the liquid level sensor and controlling the start and stop of the second water pump. The first outlet pipe is higher than the first inlet pipe. The interfaces between the first outlet pipe and the liquid cooling pipe, as well as the interfaces between the first inlet pipe and the liquid cooling pipe, are located below the liquid level sensor. When the liquid level sensor detects that the coolant level is lower than the standard height, the liquid level sensor sends a signal to the controller, which then controls the second water pump to start and pump the coolant from the storage tank through the first inlet pipe into the cooling pipe. This increases the hydraulic pressure of the coolant in the cooling pipe, causing the coolant level to rise and return to the standard range.

[0006] By adopting the above technical solution, the cable enters the air-cooled pipe from the top opening and exits the liquid-cooled pipe from the bottom opening. After the cooling system is started, the air supply device provides circulating cooling gas in the air-cooled pipe, while the first pump pumps coolant from the storage tank into the liquid-cooled pipe. The coolant then flows back into the storage tank from the first outlet pipe. As the cable passes through the air-cooled and liquid-cooled pipes, the cooling gas and liquid cool the cable. During the cable cooling process, the liquid level sensor continuously monitors the coolant level. When the liquid level sensor detects that the coolant level is below the standard height, it sends a signal to the controller. The controller then controls the second water pump to start, pumping coolant from the storage tank into the cooling pipe through the first inlet pipe. This increases the hydraulic pressure of the coolant in the cooling pipe, causing the coolant level to rise back to the standard range.

[0007] Preferably, the air-cooled pipe has an air inlet at the top and an air outlet at the bottom. The circulating air supply device delivers cooling gas into the air-cooled pipe through the air inlet, and the cooling gas in the air-cooled pipe flows back into the circulating air supply device through the air outlet. The inner wall of the air-cooled pipe is provided with an anti-blow block to prevent the cooling gas from blowing directly onto the cable. An air passage is provided along the upper edge of the anti-blow block. The air inlet of the air passage is connected to the air outlet of the air-cooled pipe, and several vent holes are provided on the side of the air passage away from the air outlet of the air-cooled pipe.

[0008] By adopting the above technical solution, the outer surface of the newly produced cable has not been fully hardened. Therefore, anti-direct-blow blocks are set to prevent cooling gas from blowing directly onto the cable, thereby preventing wrinkles from forming on the outer surface of the cable.

[0009] Preferably, a first oblique hole penetrating the anti-direct-blow block is provided on one side wall of the air passage, and the opening of the first oblique hole communicating with the air passage is higher than the other opening of the first oblique hole.

[0010] By adopting the above technical solution, the opening of the first oblique hole guides the cooling gas downwards, causing it to impact the wall of the air-cooled pipe and form a vortex within the pipe. This vortex allows the cooling gas to fill the entire pipe more quickly, while also causing it to surge continuously. This ensures that cooling gas initially far from the cable can now come into contact with it, resulting in more thorough contact between the cooling gas and the cable, thus guaranteeing effective cooling. Simultaneously, it improves the circulation efficiency of the cooling gas within the pipe, allowing the gas that has absorbed heat from the cable to exit the pipe more quickly.

[0011] Preferably, a guide plate is provided on the side wall of the anti-direct-blow block, the top end of the guide plate is hinged to the side wall of the anti-direct-blow block, the hinge axis of the guide plate is parallel to the length direction of the air passage, and the anti-direct-blow block is also provided with a drive mechanism for driving the guide plate to flip, and the air outlet of the first oblique hole is located on the flipping path of the guide plate.

[0012] By adopting the above technical solution, when it is necessary to catch up with the production plan, the cable production speed will also be faster. At this time, a drive mechanism can be used to control the rotation of the guide plate, so that the guide plate moves to the air outlet of the first inclined hole and guides the cooling gas discharged from the first inclined hole, so that the cooling gas moves more downward. This allows the cooling gas that has absorbed the heat of the cable to be discharged from the exhaust port of the air-cooling pipe more quickly, thereby accelerating the circulation of the cooling gas in the air-cooling pipe and improving the cooling effect of the cooling gas on the cable. This ensures that the cooling effect of the cable can be guaranteed even when the cable production speed is increased.

[0013] Preferably, a sliding groove is provided on the side of the guide plate away from the first oblique hole, and the driving mechanism includes a connecting block slidably connected in the sliding groove, a control rod hinged to the connecting block, and a driving component for controlling the control rod to move in the vertical direction. The axis of the hinge at the hinge point between the control rod and the connecting block is parallel to the length direction of the airway.

[0014] By adopting the above technical solution, when the drive assembly drives the control lever to descend, the control lever pushes the connecting block downward, thereby causing the guide plate to flip towards the first inclined hole. The closer the guide plate is to the first inclined hole, the better the guide plate guides the cooling gas coming out of the first inclined hole, making the cooling gas move further downward, thus allowing the cooling gas to move to the exhaust port of the air-cooling pipe more quickly. Therefore, the circulation speed of the cooling gas in the air-cooling pipe can be changed by controlling the flip angle of the guide plate.

[0015] Preferably, a first groove is formed on both side walls of the air passage along the length of the air passage, and a second groove is formed on the bottom wall of one of the first grooves in a vertical direction. The second groove is located above the first oblique hole. A clearance groove is formed on the side wall of the anti-direct-blow block in a vertical direction, and the clearance groove communicates with the second groove. The driving assembly includes a baffle plate with both ends slidably connected to the first groove, a slider slidably connected to the second groove in a vertical direction, a plurality of springs disposed in the second groove, and a connecting column slidably connected to the clearance groove and connected to the slider. The baffle plate is located near the air passage intake of the slider. On one side of the opening, a first guide slope is provided on the top of the slider. The distance from the first guide slope to the bottom wall of the second slide groove gradually increases from the side closer to the baffle to the side farther from the baffle. Several springs are located between the slider and the bottom wall of the second slide groove. The end of the connecting post away from the slider extends out of the clearance groove and is connected to the top of the control rod. When there is no external force, the several springs always drive the top of the slider to abut against the top wall of the first slide groove. The end of the first guide slope near the baffle is located in the second slide groove. When the slider moves completely into the second slide groove, the guide plate does not abut against the anti-direct-blow block.

[0016] By adopting the above technical solution, when the cooling gas enters the air passage, it pushes the baffle towards the slider, which then contacts and presses down the slider. As the slider moves downward, it compresses several springs and causes the connecting column to move downward. The downward movement of the connecting column causes the control rod and connecting block to move downward, thus causing the guide plate to flip towards the first inclined hole and guiding the cooling gas discharged from the first inclined hole. When the cable production speed increases, the workshop increases the air supply of the circulating air supply device to meet the cable's cooling requirements. With the increased air supply, the pushing force of the cooling gas on the baffle is greater, resulting in a greater downward force on the slider from the baffle, allowing the slider to move a greater distance downward and further increasing the flip angle of the guide plate.

[0017] Preferably, a one-way valve is provided in the end of the first inlet pipe near the liquid cooling pipe. The one-way valve allows coolant to flow from the first inlet pipe into the liquid cooling pipe only. The interface between the first inlet pipe and the liquid cooling pipe is located above the connection between the first outlet pipe and the liquid cooling pipe.

[0018] By adopting the above technical solution, the one-way valve can prevent the coolant in the liquid cooling pipe from flowing into the first inlet pipe, thus preventing a drop in the hydraulic pressure within the liquid cooling pipe. Simultaneously, the coolant returning to the storage tank absorbs some heat from the cable, therefore the temperature of the coolant in the storage tank is relatively higher than that of the coolant in the liquid cooling pipe. By placing the interface between the first inlet pipe and the liquid cooling pipe above the connection between the first outlet pipe and the liquid cooling pipe, the impact of the mixing of the pressurized coolant and the coolant in the liquid cooling pipe on the temperature of the coolant in the liquid cooling pipe is reduced.

[0019] The main technical effects of this invention are reflected in the following aspects: 1. This invention uses a liquid level sensor and a controller to control the start and stop of the second water pump, thereby ensuring that the coolant level remains within a predetermined height; 2. The present invention sets the interface between the first liquid inlet pipe and the liquid cooling pipe above the connection between the first liquid outlet pipe and the liquid cooling pipe to reduce the impact of the mixing of the coolant used for pressurization and the coolant in the liquid cooling pipe on the temperature of the coolant in the liquid cooling pipe. 3. The present invention controls the flipping angle of the guide plate by changing the magnitude of the pushing force of the cooling gas on the baffle. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall process flow of this application.

[0021] Figure 2 yes Figure 1 A schematic diagram of the structure of the intermediate liquid storage tank.

[0022] Figure 3 yes Figure 2 A cross-sectional view of the intermediate storage tank along line AA.

[0023] Figure 4 yes Figure 3 A schematic diagram of the structure at point B.

[0024] Figure 5 This is a schematic diagram of the structure at the top of the air-cooled pipe in this application.

[0025] Figure 6 yes Figure 5 A schematic diagram of the structure of the central anti-direct-blow block when it is not subjected to external force.

[0026] Figure 7 yes Figure 6 Cross-sectional view of the central anti-direct-blow block along the CC line.

[0027] Figure 8 yes Figure 6 A partial cross-sectional view of the central anti-direct-blow block along the DD line.

[0028] Reference numerals: 1. Air-cooled pipe; 11. Air inlet; 2. Liquid-cooled pipe; 3. Circulating air supply device; 4. Liquid supply device; 41. Liquid storage tank; 42. First water pump; 43. First liquid outlet pipe; 44. First liquid inlet pipe; 45. Liquid storage tank; 451. Boss; 452. Through hole; 453. First annular inclined surface; 46. Second liquid outlet pipe; 47. Second water pump; 48. Liquid level sensor; 49. Controller; 51. Sealing cover; 52. Anti-surge frame; 6. Control component; 61. Buoyancy ball; 6 2. Connecting rope; 63. Control unit; 631. Guide rail; 632. Sliding block; 7. Anti-direct-blow block; 71. Air passage; 72. Vent hole; 73. First inclined hole; 74. First slide groove; 75. Second slide groove; 76. Clearance groove; 8. Guide plate; 81. Sliding groove; 9. Drive mechanism; 91. Connecting block; 92. Control rod; 93. Drive assembly; 931. Baffle; 932. Slider; 9321. First guide inclined surface; 933. Spring; 934. Connecting column; 10. Cable. Detailed Implementation

[0029] The present application will be further described in detail below with reference to the accompanying drawings, so that the technical solution of the present application can be more easily understood and mastered.

[0030] Reference Figure 1 This embodiment of a three-layer co-extrusion production line for cables includes a gas-liquid balance cooling circulation system, comprising a vertically arranged air-cooled pipe 1 and a liquid-cooled pipe 2 for cooling the cable 10, and a circulating gas supply device 3 for providing cooling gas to the air-cooled pipe 1. The liquid-cooled pipe 2 is located below the air-cooled pipe 1 and connected to it. The cooling gas used in this application is nitrogen. The air-cooled pipe 1 has an inlet 11 at the top and an outlet at the bottom. The circulating gas supply device 3 includes a nitrogen storage tank, a first exhaust fan for drawing nitrogen from the nitrogen storage tank through the inlet 11 into the air-cooled pipe 1, a cooling tower for cooling the nitrogen, a second exhaust fan for drawing nitrogen from the outlet of the air-cooled pipe 1 into the cooling tower, and a third exhaust fan for drawing the cooled nitrogen from the cooling tower into the nitrogen storage tank.

[0031] Reference Figure 1 and Figure 2This embodiment of a gas-liquid balance cooling circulation system for a three-layer co-extrusion cable production line further includes a liquid supply device 4 for supplying cooling liquid to the liquid cooling pipe 2. The liquid supply device 4 includes a storage tank 41 for storing the cooling liquid, a first water pump 42 for pumping the cooling liquid in the storage tank 41 from the bottom of the liquid cooling pipe 2 into the cooling pipe, a first outlet pipe 43 and a first inlet pipe 44 fixedly connected to the top of the liquid cooling pipe 2, a storage tank 45 connected to the first outlet pipe 43, a second outlet pipe 46 fixedly connected to the bottom of the storage tank 45 for connecting the storage tank 45 and the storage tank 41, a second water pump 47 for pumping the cooling liquid in the storage tank 45 into the first inlet pipe 44, a liquid level sensor 48 disposed in the liquid cooling pipe 2, and a controller 49 for receiving signals from the liquid level sensor 48 and controlling the start and stop of the second water pump 47. The liquid level sensor 48 is fixedly embedded in the inner wall of the top of the liquid cooling pipe 2 and close to the top outlet of the liquid cooling pipe 2. The inlet of the first water pump 42 is connected to the storage tank 41 via a water pipe, and the outlet of the first water pump 42 is connected to the bottom of the liquid cooling pipe 2 via a water pipe. The opening of the first inlet pipe 44 away from the liquid cooling pipe 2 is connected to the outlet pipe of the second water pump 47, and the inlet of the second water pump 47 is connected to the outlet of the storage tank 45 via a water pipe. The controller 49 is fixedly connected to the water pump.

[0032] Reference Figure 1 and Figure 2 Cable 10 enters air-cooled pipe 1 from the top opening and exits liquid-cooled pipe 2 from the bottom opening. After the cooling system starts, the circulating air supply device 3 provides circulating cooling gas within air-cooled pipe 1, while the first pump pumps coolant from storage tank 41 into liquid-cooled pipe 2. The coolant then flows back to storage tank 45 from the first outlet pipe 43. As cable 10 passes through air-cooled pipe 1 and liquid-cooled pipe 2, the cooling gas and liquid cool the cable 10. During the cooling process, liquid level sensor 48 continuously monitors the coolant level. When liquid level sensor 48 detects that the coolant level is below the standard height, it sends a signal to controller 49. Controller 49 then controls the second water pump 47 to start, pumping coolant from storage tank 45 into the cooling pipe through the first inlet pipe 44. This increases the hydraulic pressure of the coolant in the cooling pipe, raising the coolant level back to the standard range.

[0033] Reference Figure 1 and Figure 2A one-way valve is fixedly connected to the end of the first inlet pipe 44 near the liquid cooling pipe 2. The one-way valve only allows coolant to flow from the first inlet pipe 44 into the liquid cooling pipe 2. The interface between the first inlet pipe 44 and the liquid cooling pipe 2 is located above the connection between the first outlet pipe 43 and the liquid cooling pipe 2. The coolant flowing back into the storage tank 45 absorbs a certain amount of heat from the cable 10, therefore the temperature of the coolant in the storage tank 45 is relatively higher than that of the coolant in the liquid cooling pipe 2. The interface between the first inlet pipe 44 and the liquid cooling pipe 2 is located above the connection between the first outlet pipe 43 and the liquid cooling pipe 2 to reduce the impact of the mixing of the coolant used for pressurization and the coolant in the liquid cooling pipe 2 on the temperature of the coolant in the liquid cooling pipe 2.

[0034] Reference Figure 1 , Figures 3-5 The inner wall of the storage tank 45 has an upwardly protruding boss 451. A through hole 452 is formed on the top surface of the boss 451, penetrating the storage tank 45. A second liquid pipe is connected to the bottom outlet of the through hole 452. A first annular inclined surface 453 is formed on the top side wall of the through hole 452. The diameter of the first annular inclined surface 453 gradually decreases from the top to the bottom. The side wall of the sealing cover 51 is attached to the first annular inclined surface 453. The storage tank 45 contains a sealing cover 51 for sealing the through hole 452 and a control assembly 6 for controlling the up-and-down movement of the sealing cover 51. The control assembly 6 includes a buoyancy ball 61, a connecting rope 62 for connecting the buoyancy ball 61 and the sealing cover 51, and a control part 63 for controlling the sealing cover 51 to always move in the vertical direction. The control unit 63 includes several guide rails 631 fixedly connected to the top surface of the boss 451, and several sliding blocks 632 fixedly connected to the top of the sealing cover 51 and slidably connected to the guide rails 631 in a vertical direction. The guide rails 631 are equidistantly distributed around the periphery of the sealing cover 51. A wave-damping frame 52 with its opening facing downward is provided on the top wall of the inner cavity of the liquid storage tank 45. The buoyancy ball 61 floats up and down inside the wave-damping frame 52, which is located above the boss 451.

[0035] Reference Figure 1 , Figures 3-5 When the coolant level in the reservoir 45 rises to a certain height, the buoyancy ball 61 floats up and straightens the connecting rope 62. If the coolant level in the reservoir 45 continues to rise, the buoyancy ball 61 will be submerged in water and exert an upward pull on the sealing cap 51. When the coolant level rises beyond the critical point, the sum of the hydraulic pressure on the sealing cap 51 and the weight of the sealing cap 51 will be less than the buoyancy of the buoyancy ball 61. At this time, the buoyancy ball will float up and pull the sealing cap 51 upward, so that the sealing cap 51 is no longer blocking the through hole 452. At this time, the coolant in the reservoir 45 can be discharged through the through hole 452, causing the coolant level to drop. This ensures that there is enough coolant in the reservoir for pressurization and allows the coolant in the reservoir 45 to be automatically discharged.

[0036] In this embodiment, the coolant is water.

[0037] Reference Figure 1 , Figures 5-8 An anti-direct-blow block 7 is fixedly connected to the inner wall of the air-cooled pipe 1 to prevent cooling gas from blowing directly onto the cable 10. An air passage 71 is formed on the anti-direct-blow block 7 along a direction perpendicular to the axis of the air-cooled pipe 1. The air inlet 11 of the air passage 71 connects to the air outlet of the air-cooled pipe 1. Several vent holes 72 are formed on the side of the air passage 71 away from the air outlet of the air-cooled pipe 1, and these vent holes 72 face the cable 10. A first oblique hole 73 penetrating the anti-direct-blow block 7 is formed on one side wall of the air passage 71. The opening of the first oblique hole 73 that connects to the air passage 71 is higher than the other opening of the first oblique hole 73. A first groove 74 is provided on both sides of the air passage 71 along the length of the air passage 71. A second groove 75 is provided on the bottom wall of one side of the first groove 74 along the vertical direction. The second groove 75 is located above the first inclined hole 73. A clearance groove 76 is provided on the side wall of the anti-direct blowing block 7 along the vertical direction. The clearance groove 76 is connected to the second groove 75.

[0038] Reference Figure 1 , Figures 5-8 A guide plate 8 is installed on the side wall of the anti-direct-blow block 7. The top of the guide plate 8 is hinged to the side wall of the anti-direct-blow block 7. The axis of the hinge of the guide plate 8 is parallel to the length direction of the air passage 71. The air outlet of the first oblique hole 73 is located on the flipping path of the guide plate 8. A sliding groove 81 is provided on the side of the guide plate 8 away from the first oblique hole 73. The length direction of the sliding groove 81 is perpendicular to the length direction of the air passage 71.

[0039] Reference Figure 1 , Figures 5-8 The anti-direct-blow block 7 is also provided with a drive mechanism 9 for driving the guide plate 8 to flip. The drive mechanism 9 includes a connecting block 91 that is slidably connected in the sliding groove 81, a control rod 92 that is hinged to the connecting block 91, and the axis of the hinge at the hinge point between the control rod 92 and the connecting block 91 is parallel to the length direction of the airway 71.

[0040] Reference Figure 1 , Figures 5-8The drive mechanism 9 also includes a drive assembly 93 for controlling the control lever 92 to move in the vertical direction. The drive assembly 93 includes a baffle 931 with both ends slidably connected to the first slide groove 74 along the length of the air passage 71, a slider 932 slidably connected to the second slide groove 75 along the vertical direction, and two springs 933 located in the second slide groove 75. The baffle 931 is located on the side of the slider 932 near the air inlet 11 of the air passage 71. A first guide slope 9321 is provided on the top of the slider 932. The distance from the first guide slope 9321 to the bottom wall of the second slide groove 75 gradually increases from the side near the baffle 931 to the side away from the baffle 931. Two through holes 452 are vertically formed on the first guide slope 9321 of the slider 932. Two guide rods are fixedly connected to the bottom wall of the second slide groove 75, and the two guide rods are respectively inserted into the two through holes 452. Two springs 933 are respectively sleeved on the two guide rods. One end of each spring 933 abuts against the bottom wall of the slider 932, and the other end abuts against the bottom wall of the second slide groove 75. When there is no external force, the springs 933 always drive the top of the slider 932 to abut against the top wall of the first slide groove 74, and the end of the first guide slope 9321 near the baffle 931 is located in the second slide groove 75.

[0041] Reference Figure 1 , Figures 5-8 The drive assembly 93 also includes a connecting post 934 that slides along the length of the air-cooling pipe 1 and is connected to the clearance groove 76. One end of the connecting post 934 is fixedly connected to the slider 932, and the other end extends out of the clearance groove 76 and is fixedly connected to the top of the control rod 92. When the slider 932 moves completely into the second slide groove 75, the guide plate 8 does not collide with the anti-direct-blow block 7, and there is still a certain space between the guide plate 8 and the first oblique hole 73 for nitrogen to pass through.

[0042] When nitrogen is pumped into the air-cooling pipe 1 by the first pump, it pushes the baffle 931 toward the slider 932 to contact the first guide slope 9321 and press down the slider 932. When the slider 932 moves downward, it will cause several springs 933 to compress and the connecting column 934 to move downward. When the connecting column 934 moves downward, it will cause the connecting block 91 and the control block 92 to move downward, thereby causing the guide plate 8 to flip toward the first inclined hole 73. When the guide plate 8 is closer to the first inclined hole 73, the guide plate 8 has a better guiding effect on the cooling gas coming out of the first inclined hole 73, which can make the cooling gas move further downward, so that the cooling gas can move to the exhaust port of the air-cooling pipe 1 faster.

[0043] When the production speed of cable 10 increases, in order to meet the cooling requirements of cable 10, the workshop will increase the power of the first air pump to increase the nitrogen supply. When the nitrogen supply increases, the nitrogen pushes the baffle 931 more, which makes the baffle 931 push the slider 932 more, thus allowing the slider 932 to move down a greater distance, and further making the flip angle of the guide plate 8 greater, thereby increasing the circulation speed of nitrogen in the air cooling pipe 1, thus ensuring that the nitrogen can meet the cooling requirements of cable 10.

[0044] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A gas-liquid balance cooling circulation system for a three-layer co-extrusion production line for cables, characterized in that: The system includes vertically arranged air-cooled pipes and liquid-cooled pipes for cooling cables, a circulating air supply device for providing cooling gas to the air-cooled pipes, and a liquid supply device for providing cooling liquid to the liquid-cooled pipes. The liquid supply device includes a storage tank for storing the coolant, a first water pump for pumping the coolant from the storage tank from the bottom of the liquid-cooled pipes into the cooling pipes, a first outlet pipe and a first inlet pipe located at the top of the liquid-cooled pipes, a storage tank connected to the first outlet pipe, a second outlet pipe located at the bottom of the storage tank for connecting the storage tank and the storage tank, and a second outlet pipe for pumping the coolant from the storage tank into the first inlet pipe. The system includes two water pumps, a liquid level sensor located inside the liquid cooling pipe, and a controller for receiving signals from the liquid level sensor and controlling the start and stop of the second water pump. The interfaces between the first outlet pipe and the liquid cooling pipe, as well as the interfaces between the first inlet pipe and the liquid cooling pipe, are all located below the liquid level sensor. When the liquid level sensor detects that the coolant level is below the standard height, the liquid level sensor sends a signal to the controller, which then controls the second water pump to start and pump the coolant from the storage tank through the first inlet pipe into the cooling pipe. This increases the hydraulic pressure of the coolant in the cooling pipe, causing the coolant level to rise and return to the standard range of liquid level. The air-cooled pipe has an air inlet at the top and an air outlet at the bottom. The circulating air supply device delivers cooling gas into the air-cooled pipe through the air inlet. The cooling gas in the air-cooled pipe flows back into the circulating air supply device through the air outlet. The inner wall of the air-cooled pipe is provided with a direct-blow block to prevent the cooling gas from blowing directly onto the cable. The direct-blow block has an air passage. The air inlet of the air passage is connected to the air outlet of the air-cooled pipe. Several vent holes are provided on the side of the air passage away from the air outlet of the air-cooled pipe. A first oblique hole penetrating the anti-direct-blow block is provided on one side wall of the air passage, and the opening of the first oblique hole communicating with the air passage is higher than the other opening of the first oblique hole. A guide plate is provided on the side wall of the anti-direct-blow block. The top end of the guide plate is hinged to the side wall of the anti-direct-blow block. The hinge axis of the guide plate is parallel to the length direction of the air passage. The anti-direct-blow block is also provided with a drive mechanism for driving the guide plate to flip. The air outlet of the first oblique hole is located on the flipping path of the guide plate. A sliding groove is provided on the side of the guide plate away from the first oblique hole. The driving mechanism includes a connecting block that is slidably connected in the sliding groove, a control rod that is hinged to the connecting block, and a driving component for controlling the control rod to move in the vertical direction. The axis of the hinge at the hinge point between the control rod and the connecting block is parallel to the length direction of the airway.

2. The gas-liquid balance cooling circulation system for a three-layer co-extrusion cable production line according to claim 1, characterized in that: Both sides of the air passage have a first groove along its length. A second groove is formed vertically on the bottom wall of one of the first grooves, located above the first oblique hole. A clearance groove is formed vertically on the side wall of the anti-direct-blow block, communicating with the second groove. The drive assembly includes a baffle plate slidably connected at both ends to the first groove, a slider slidably connected vertically to the second groove, several springs disposed in the second groove, and a connecting post slidably connected in the clearance groove and connected to the slider. The baffle plate is located near the air passage inlet of the slider. On the side, a first guide slope is provided on the top of the slider. The distance from the first guide slope to the bottom wall of the second slide groove gradually increases from the side closer to the baffle to the side farther from the baffle. Several springs are located between the slider and the bottom wall of the second slide groove. The end of the connecting post away from the slider extends out of the clearance groove and is connected to the top of the control rod. When there is no external force, several springs always drive the top of the slider to abut against the top wall of the first slide groove. The end of the first guide slope near the baffle is located in the second slide groove. When the slider moves completely into the second slide groove, the guide plate does not abut against the anti-direct-blow block.

3. The gas-liquid balance cooling circulation system for a three-layer co-extrusion cable production line according to claim 1, characterized in that: A one-way valve is provided in the end of the first inlet pipe near the liquid cooling pipe. The one-way valve allows coolant to flow from the first inlet pipe into the liquid cooling pipe. The interface between the first inlet pipe and the liquid cooling pipe is located above the connection between the first outlet pipe and the liquid cooling pipe.

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