Nylon pipe extrusion cooling device

Abstract

The invention discloses a nylon tube extrusion cooling device, which belongs to the technical field of cooling devices, and comprises a plurality of module water tanks which are divided into a head section cooling water tank, a tail section cooling water tank and a middle section cooling water tank, and the module water tanks are hermetically connected through connecting male heads and connecting female heads to form a straight line series connection communication structure. Each cooling water tank is provided with an independent cooling circulation mechanism and a control box, the cooling circulation mechanism comprises a heat exchanger, an integrated water tank and a circulating pump, and the control box accurately adjusts the water temperature through a temperature sensor and an internal PLC based on a PID control algorithm. A central control module is further integrated in a control box of the first-section cooling water tank, the cooling water tanks can be controlled in a coordinated linkage mode to achieve gradient cooling, and cooling parameters are analyzed and optimized through historical data. Through modular design, independent cooling control and intelligent linkage, the cooling efficiency and the cooling quality are greatly improved, and the production requirements of nylon pipes of different specifications are effectively met.

Description

Technical Field

[0001] The invention relates to the technical field of cooling devices, in particular to a nylon tube extrusion cooling device. Background Art

[0002] Nowadays, various oil pipes and other pipelines on automobiles are made of nylon tubes, which are generally produced by extrusion. The process of nylon tube extrusion production starts with raw material preparation. The dried nylon particles are heated and melted by the extruder and extruded into shape. Then, the vacuum sizing is performed to ensure the accuracy of the pipe size, and then the pipe enters the cooling water tank for water cooling or spray cooling to shape. The cooled pipe is pulled out at a uniform speed by the traction machine and cut to the specified length. Finally, the nylon tube is heated and placed in the molding mold for shaping. Various special-shaped pipes used in automobiles are obtained.

[0003] As an important step in the extrusion process, the cooling water trough plays a vital role in the final quality of the nylon tube. It ensures the dimensional accuracy and surface smoothness of the tube through uniform cooling, avoiding shrinkage, deformation or surface defects. At the same time, the stable cooling process reduces internal stress and improves the mechanical properties of the nylon tube. However, the existing cooling water troughs have many shortcomings in structural design and temperature control, and it is difficult to meet the high-quality and high-efficiency production needs.

[0004] First of all, in terms of structural design, most traditional nylon tube extrusion cooling devices adopt an integral structure, which has poor flexibility in practical applications and is difficult to adjust and expand according to different production needs. When cooling nylon tubes of different lengths or specifications and special nylon tubes is required, the entire cooling device often needs to be replaced, which not only increases equipment costs but also reduces production efficiency. In addition, the cooling device with an integral structure is more complicated to install and maintain. Once a part fails, the entire device may need to be disassembled and repaired, resulting in long maintenance time and high maintenance costs.

[0005] Secondly, in terms of cooling control, the temperature control method of the existing nylon tube extrusion cooling device is relatively extensive and lacks an independent and precise control system. Most devices only use a simple temperature adjustment method and cannot perform precise temperature control according to the actual cooling needs of the nylon tube. The temperature difference between the head and tail of the cooling water tank with an integral structure is large and cannot be accurately controlled, resulting in uneven temperature in various parts of the nylon tube during the cooling process, which is prone to quality problems such as internal stress concentration and surface cracks. At the same time, it is difficult for operators to flexibly adjust the cooling parameters according to the material, specifications and production process requirements of different nylon tubes, and it is impossible to implement targeted cooling solutions. Summary of the invention

[0006] The main purpose of the present invention is to provide a nylon tube extrusion cooling device, which can effectively solve the problems mentioned in the background technology.

[0007] To achieve the above object, the technical solution adopted by the present invention is: A nylon tube extrusion cooling device comprises a plurality of module water tanks, wherein the module water tanks are divided into a first section cooling water tank, a tail section cooling water tank and a middle section cooling water tank, wherein the first section cooling water tank, the tail section cooling water tank and the middle section cooling water tank are connected by a connecting male head and a connecting female head, wherein the connecting male head and the connecting female head are sealed to connect the middle section cooling water tank with the first section cooling water tank and the tail section cooling water tank in series in a straight line; The first-section cooling water trough, the tail-section cooling water trough, and the middle-section cooling water trough all include a base, on which a cooling circulation mechanism and a control box are installed, and a trough body is fixedly installed on the top of the base. The cooling circulation mechanism is provided with an outlet pipe and a return pipe, and the outlet pipe and the return pipe are respectively connected to the tail and the head of the trough body to form a circulation. The control box is electrically connected to the cooling circulation mechanism, and is used for the control box to issue control instructions to the cooling circulation mechanism. The control boxes are electrically connected to each other through a field bus to form a linkage control.

[0008] Preferably, an anti-overflow box is fixedly installed at the front end of the trough body of the first section cooling water trough, a hollow interlayer is provided inside the anti-overflow box, and a plurality of overflow holes are provided on the inner walls on both sides, the overflow holes are connected to the hollow interlayer, and the horizontal position of the overflow holes is lower than the upper end surface of the trough body, an overflow pipe is fixedly connected to the bottom of the anti-overflow box, the overflow pipe is connected to the hollow interlayer of the anti-overflow box, and the other end of the overflow pipe is connected to the return pipe; a connecting male head is fixedly installed at the rear end of the trough body of the first section cooling water trough.

[0009] Preferably, a connecting female connector is fixedly installed at the front end of the trough body of the tail section cooling water trough, and an anti-overflow box similar to that on the first section cooling water trough is fixedly installed at the rear end of the trough body of the tail section cooling water trough, and an overflow pipe is also connected to the bottom of the anti-overflow box to connect to the return water pipe.

[0010] Preferably, a connecting female head is fixedly installed at the front end of the trough body of the middle section cooling water trough, and a connecting male head is fixedly installed at the rear end. A connecting groove is opened inside the connecting female head, and a circle of sealing gasket is arranged at the bottom of the connecting groove. The shape and size of the connecting male head match the connecting groove, and a plurality of sealing rings are embedded on the inner and outer surfaces of the connecting male head.

[0011] Preferably, partitions are provided at both ends of the trough body, and grooves for allowing nylon tubes to pass through are opened on the partitions. A number of rotating rollers are fixedly installed on the inner bottom surface of the trough body, and a water inlet head is installed at the head position of the inner bottom surface of the trough body, and a water return port is installed at the tail position. A U-shaped head is fixedly installed on the top of the water inlet head, and a number of water outlet holes are evenly arranged on the inner ring surface of the U-shaped head. The water return port is funnel-shaped, and its top surface is flush with the inner bottom surface of the trough body. A pair of temperature sensors are also installed on both sides of the water inlet head and the water return port on the inner bottom surface of the trough body, and the temperature sensors are connected to the control box through control lines.

[0012] Preferably, the cooling circulation mechanism includes a heat exchanger, an integrated water tank and a circulation pump. The heat exchanger and the integrated water tank are an integrated structure. One end of the return pipe is connected to the return port, and the other end is connected to the inlet of the heat exchanger. One end of the outlet pipe is connected to the water inlet head, and the other end is connected to the outlet of the circulation pump. The inlet of the circulation pump is connected to the integrated water tank through a pipeline.

[0013] Preferably, a PLC controller and a human-machine interface are provided inside the control box. The PLC controller receives the temperature signal transmitted by the temperature sensor and adopts a PID (proportional-integral-differential) control algorithm to automatically adjust the flow rate of the circulation pump and the cooling power of the heat exchanger according to the deviation between the current temperature and the set temperature, so that the water temperature reaches the target value; the human-machine interface includes an interactive touch screen, and the cooling requirements of different nylon tubes are set through the interactive touch screen, including the target water temperature and the gradient cooling curve.

[0014] Preferably, the interactive touch screen can also display the water inlet temperature, water outlet temperature, working status information of the circulation pump and heat exchanger of the corresponding module water tank in real time. The interactive touch screen also integrates alarm display and reminder. When the water temperature is abnormal or the equipment fails, the alarm information is displayed and a sound alarm is issued.

[0015] Preferably, a central control module is also integrated in the control box of the first section cooling water tank. The central control module coordinates and controls all control boxes, sets the water temperature gradient of different module water tanks according to the cooling requirements of the nylon tube, and sends the target water temperature to each control box. The central control module also records the water temperature, flow rate, and equipment status data of each module water tank, and optimizes the cooling parameters through historical data analysis.

[0016] Preferably, the specific operations of linkage control performed by the central control module include: ①Set water temperature gradient: The central control module generates a gradient cooling curve through a built-in algorithm based on the cooling requirements of the nylon tube, including tube diameter, wall thickness, extrusion speed and material properties. At the same time, it divides the temperature range into the same number based on the actual number of module water tanks installed, and sets the target water temperature (such as high temperature zone, medium-high temperature zone, medium temperature zone, and low temperature zone) respectively; the operator inputs the cooling requirement parameters through the human-machine interface (HMI), and the system automatically calculates and determines the target water temperature of each module water tank.

[0017] ②Send the target water temperature to each control box: The central control module sends the target water temperature to the control box of each module's water tank through the field bus; after the control box receives the target water temperature, the internal PLC controller uses the PID control algorithm to adjust the flow of the circulation pump and the cooling capacity of the heat exchanger to stabilize the water temperature near the target value; the central control module monitors the water temperature changes of each module's water tank in real time and dynamically adjusts the instructions to ensure the gradient cooling effect.

[0018] ③Record the data of each cooling water tank: The central control module collects the water temperature, flow rate and equipment status (such as the operating status of the circulation pump and heat exchanger) of each module water tank in real time, and stores this data in the database, supporting long-term preservation and historical query; through the human-machine interface (HMI), operators can view current data and historical records in real time, making it easier to monitor the operating status of the cooling process.

[0019] ④Optimize cooling parameters through historical data analysis: The central control module analyzes the stored historical data, including indicators such as water temperature fluctuations, cooling efficiency and energy consumption, identifies the optimization points in the cooling process, and automatically adjusts the cooling parameters (such as water temperature gradient, circulation pump flow, heat exchanger power); through continuous data analysis and parameter optimization, the system can improve cooling efficiency and quality, and generate analysis reports to guide the intelligent improvement of production processes.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The present invention designs a modular cooling water tank, which is composed of a first section, a tail section and a middle section of cooling water tanks connected in series in a straight line through a male connector and a female connector. It has high flexibility, convenience and good sealing. In terms of assembly, the number of cooling water tanks can be flexibly adjusted according to different production needs, and the cooling requirements of nylon tubes of different lengths and specifications can be easily adapted, which improves the versatility and applicability of the device. In terms of installation and maintenance, each cooling water tank is an independent module unit, which is easy to install and maintain, and can be repaired or replaced separately without affecting the operation of other modules, greatly shortening the maintenance time and improving production efficiency.

[0021] Each modular cooling water tank is equipped with an independent cooling control system consisting of a cooling circulation mechanism and a control box. With the help of temperature sensors on both sides of the water inlet and return port in the cooling water tank, the temperature signal is transmitted to the PLC controller in the control box. The PID control algorithm is used to automatically adjust the circulation pump flow and the cooling power of the heat exchanger according to the temperature deviation to ensure that the water temperature accurately reaches the target value and the cooling temperature of the nylon tube is uniform.

[0022] In addition, a central control module is integrated in the control box of the first section cooling water tank. It can generate a gradient cooling curve through a built-in algorithm according to the cooling requirements of special nylon tubes, combined with the relevant characteristics of the tubes and the actual number of module water tanks installed, and divide the temperature intervals into a corresponding number to set the target water temperature of each module water tank. Operators can also input cooling demand parameters through the human-machine interface (HMI). The system automatically calculates and determines the target water temperature of each module water tank, and sends it to each control box to complete linkage control, realize gradient cooling and precise temperature control, thereby improving cooling quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the assembly structure of the cooling device of the present invention; Figure 2 This is a schematic diagram of the structure of the first cooling water tank of the present invention; Figure 3 It is a schematic diagram of the structure of the tail cooling water tank of the present invention; Figure 4 It is a schematic diagram of the structure of the middle cooling water tank of the present invention; Figure 5 It is a schematic diagram of the tank structure and the assembly connection between the tanks of the present invention; Figure 6 It is a schematic diagram of the water inlet head structure of the present invention; Figure 7 It is a schematic diagram of the anti-overflow box structure of the present invention; Figure 8 It is a schematic diagram of the cooling cycle mechanism structure of the present invention.

[0024] In the figure: 1. First section cooling water trough; 2. Tail section cooling water trough; 3. Middle section cooling water trough; 4. Base; 5. Cooling circulation mechanism; 6. Control box; 7. Tank body; 8. Anti-overflow box; 9. Overflow pipe; 10. Male connector; 11. Female connector; 12. Rotating roller; 13. Water inlet; 14. Water return port; 15. Temperature sensor; 16. Partition; 17. Sealing ring; 18. Connecting groove; 19. Sealing gasket; 20. U-shaped head; 21. Water outlet; 22. Overflow hole; 23. Heat exchanger; 24. Integrated water tank; 25. Circulation pump; 26. Water outlet pipe; 27. Water return pipe; 28. Module water trough. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0026] like Figure 1 As shown, a nylon tube extrusion cooling device includes a plurality of module water tanks 28, which are divided into a first section cooling water tank 1, a tail section cooling water tank 2 and a middle section cooling water tank 3. The first section cooling water tank 1, the tail section cooling water tank 2 and the middle section cooling water tank 3 are connected by a connecting male head 10 and a connecting female head 11. The connecting male head 10 and the connecting female head 11 are sealed to connect the middle section cooling water tank 3 with the first section cooling water tank 1 and the tail section cooling water tank 2 in series. The first section cooling water tank 1 and the tail section cooling water tank 2 are located at the head and tail of the cooling device. The number of the middle section cooling water tanks 3 can be selected according to actual production needs, from zero to several, and the middle section cooling water tank 3 can be installed between the first section cooling water tank 1 and the tail section cooling water tank 2.

[0027] like Figure 2 , Figure 7 As shown, an overflow prevention box 8 is fixedly installed at the front end of the tank body 7 of the first-stage cooling water tank 1. A hollow interlayer is arranged inside the overflow prevention box 8, and a plurality of overflow holes 22 are provided on the inner walls on both sides. The overflow holes 22 are connected to the hollow interlayer, and the horizontal position of the overflow holes 22 is lower than the upper end surface of the tank body 7. An overflow pipe 9 is fixedly connected to the bottom of the overflow prevention box 8. The overflow pipe 9 is connected to the hollow interlayer of the overflow prevention box 8, and the other end of the overflow pipe 9 is connected to the return pipe 27. When the operation starts, the water inlet and outlet in the tank body 7 cannot reach balance immediately, so that if there is excess cooling water, it can enter the overflow prevention box 8, flow into the hollow interlayer through the overflow hole 22, and then flow back to the cooling circulation mechanism 5 through the overflow pipe 9 until the water inlet and outlet in the tank body 7 reach balance. A male connector 10 is fixedly installed at the rear end of the tank body 7 of the first-stage cooling water tank 1.

[0028] like Figure 3 As shown, a connecting female connector 11 is fixedly installed at the front end of the trough body 7 of the tail section cooling water trough 2, and an anti-overflow box 8 which is the same as that on the first section cooling water trough 1 is fixedly installed at the rear end of the trough body 7 of the tail section cooling water trough 2, and an overflow pipe 9 is also connected to the bottom of the anti-overflow box 8 to connect to the return pipe 27.

[0029] like Figure 4 , Figure 5As shown, a connecting female head 11 is fixedly installed at the front end of the trough body 7 of the middle section cooling water trough 3, and a connecting male head 10 is fixedly installed at the rear end. A connecting groove 18 is provided inside the connecting female head 11, and a circle of sealing gasket 19 is provided at the bottom of the connecting groove 18. The shape and size of the connecting male head 10 match the connecting groove 18, and a plurality of sealing rings 17 are embedded on the inner and outer surfaces of the connecting male head 10. The multiple sealing designs effectively avoid the problem of cooling water leakage.

[0030] like Figure 5 , Figure 6 As shown, partitions 16 are provided at both ends of the tank body 7, which can partially avoid the cross-flow of cooling water between the two module water tanks 28, creating relatively stable conditions for the subsequent cooling temperature control. A groove for the nylon tube to pass through is provided on the partition 16. Several rotating rollers 12 are fixedly installed on the inner bottom surface of the tank body 7. A water inlet head 13 is installed at the head position of the inner bottom surface of the tank body 7, and a water return port 14 is installed at the tail position. A U-shaped head 20 is fixedly installed on the top of the water inlet head 13, and several water outlet holes 21 are evenly provided on the inner ring surface of the U-shaped head 20. When the nylon tube enters the tank body 7, it passes through the middle of the U-shaped head 20, so that the cooling water can wrap the nylon tube, ensuring uniform and sufficient cooling. The water return port 14 is funnel-shaped, and its top surface is flush with the inner bottom surface of the tank body 7. A pair of temperature sensors 15 are also installed on both sides of the water inlet head 13 and the water return port 14 on the inner bottom surface of the tank body 7. The temperature sensor 15 is connected to the control box 6 through a control line.

[0031] like Figure 8 As shown, the cooling circulation mechanism 5 includes a heat exchanger 23, an integrated water tank 24 and a circulation pump 25. The heat exchanger 23 and the integrated water tank 24 are an integrated structure. The cooling circulation mechanism 5 is also provided with a water outlet pipe 26 and a water return pipe 27. One end of the water return pipe 27 is connected to the water return port 14, and the other end is connected to the inlet of the heat exchanger 23. One end of the water outlet pipe 26 is connected to the water inlet head 13, and the other end is connected to the outlet of the circulation pump 25. The inlet of the circulation pump 25 is connected to the integrated water tank 24 through a pipeline.

[0032] In this embodiment, a PLC controller and a human-machine interface are provided inside the control box 6. The PLC controller receives the temperature signal transmitted by the temperature sensor 15, and adopts a PID (proportional-integral-differential) control algorithm to automatically adjust the flow of the circulation pump 25 and the cooling power of the heat exchanger 23 according to the deviation between the current temperature and the set temperature, so that the water temperature reaches the target value; the human-machine interface includes an interactive touch screen, through which the cooling requirements of different nylon tubes are set, including the target water temperature and the gradient cooling curve. The interactive touch screen can also display the inlet water temperature, outlet water temperature, working status information of the circulation pump 25 and the heat exchanger 23 of the corresponding module water tank 28 in real time. The interactive touch screen also integrates alarm display and reminder. When the water temperature is abnormal or the equipment fails, the alarm information is displayed and the sound alarm is issued.

[0033] In this embodiment, a central control module is also integrated in the control box 6 of the first-section cooling water tank 1. The central control module coordinates and controls all the control boxes 6, sets the water temperature gradient of different module water tanks 28 according to the cooling requirements of the nylon tube, and sends the target water temperature to each control box 6. The central control module also records the water temperature, flow rate, and equipment status data of each module water tank 28, and optimizes the cooling parameters through historical data analysis.

[0034] In actual production applications, first during the installation and commissioning of the device, since the installation structures of the module sinks 28 are consistent, the bases 4 of the same specifications and sizes are used, and the bases 4 are provided with anchor bolt fixing seats, it is only necessary to pre-arrange the anchor bolt installation positions on the ground, so that the subsequent assembly of the module sinks 28 is much more convenient and quick. When assembling the module sinks 28, the male connector 10 is inserted into the female connector 11, and multiple seals are performed through the sealing gasket 19 and the sealing ring 17. In addition, the positioning installation of the base 4 makes the connection between the male connector 10 and the female connector 11 between each module sink 28 sufficiently firm, and also optimizes the connection structure.

[0035] In actual production work, the operator can set the target water temperature of each module water tank 28 individually through the human-machine interface in the control box 6. After the nylon tube passes through the extruder and vacuum setting, it enters the tank body 7 from the front end of the first cooling water tank 1, passes through the middle of the water inlet head 13, and moves to the rear section with the assistance of the rotating roller 12. At the same time, the cooling circulation mechanism 5 also works synchronously. The circulating pump 25 extracts the cooling water in the integrated water tank 24, sends it to the water inlet head 13 through the outlet pipe 26, and then flows out from the outlet hole 21 of the inner ring of the U-shaped head 20 to cool the passing nylon tube. The cooling water flow direction is the same as the travel direction of the nylon tube, avoiding the influence of water flow resistance, reducing temperature fluctuations, and better meeting the cooling needs. At the same time, the return water port 14 at the tail of the tank body 7 also recovers the heat-absorbing cooling water, and sends it back to the heat exchanger 23 through the return water pipe 27 for heat exchange cooling, and finally sends the cooled cooling water to the integrated water tank 24 to form a cycle. During this process, the temperature sensors 15 located at the water inlet 13 and the water return port 14 send back the temperatures of the two places in real time. The PLC controller inside the control box 6 adopts a PID control algorithm to automatically adjust the flow rate of the circulation pump 25 and the cooling power of the heat exchanger 23 according to the deviation between the current temperature sent back by the temperature sensor 15 and the set target water temperature, so that the water temperature reaches the target value.

[0036] At the same time, the central control module integrated in the control box 6 of the first cooling water tank 1 can also be set with one button. The operator sets the cooling demand parameters and parameters such as pipe diameter, wall thickness, extrusion speed and material properties through its internal human-machine interface. The central control module generates a gradient cooling curve through a built-in algorithm based on the input parameters and requirements, and divides the same number of temperature intervals based on the number of module water tanks 28 actually installed, and sets the target water temperature respectively. The central control module sends the target water temperature to the control box 6 of each module water tank 28 through the field bus; after the control box 6 receives the target water temperature, the internal PLC controller uses the PID control algorithm to adjust the flow of the circulation pump 25 and the cooling capacity of the heat exchanger 23 to stabilize the water temperature near the target value; during this process, the central control module monitors the water temperature changes of each module water tank 28 in real time. If the water temperature of a module water tank 28 deviates from the target value, the central control module sends an adjustment instruction to ensure the stability of the water temperature to ensure the gradient cooling effect.

[0037] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A nylon tube extrusion cooling device, comprising a plurality of modular water tanks (28), characterized in that: The module water tank (28) is divided into a first-section cooling water tank (1), a tail-section cooling water tank (2) and a middle-section cooling water tank (3); the first-section cooling water tank (1), the tail-section cooling water tank (2) and the middle-section cooling water tank (3) are connected via a connecting male head (10) and a connecting female head (11); the connecting male head (10) and the connecting female head (11) are sealed to connect the middle-section cooling water tank (3) to the first-section cooling water tank (1) and the tail-section cooling water tank (2) in series in a straight line; The first section cooling water tank (1), the tail section cooling water tank (2), and the middle section cooling water tank (3) all comprise a base (4), a cooling circulation mechanism (5) and a control box (6) are mounted on the base (4), a tank body (7) is fixedly mounted on the top of the base (4), the cooling circulation mechanism (5) is provided with a water outlet pipe (26) and a water return pipe (27), the water outlet pipe (26) and the water return pipe (27) are respectively connected to the tail and the head of the tank body (7) to form a cooling medium circulation, the control box (6) is electrically connected to the cooling circulation mechanism (5), and is used for the control box (6) to issue control instructions to the cooling circulation mechanism (5), and the control boxes (6) are electrically connected to each other via a field bus to form a linkage control.

2. A nylon tube extrusion cooling device according to claim 1, characterized in that: An overflow prevention box (8) is fixedly installed at the front end of the tank body (7) of the first-stage cooling water tank (1), wherein a hollow interlayer is provided inside the overflow prevention box (8), and a plurality of overflow holes (22) are provided on the inner walls on both sides, wherein the overflow holes (22) are connected to the hollow interlayer, and the horizontal position of the overflow holes (22) is lower than the upper end surface of the tank body (7), and an overflow pipe (9) is fixedly connected to the bottom of the overflow prevention box (8), wherein the overflow pipe (9) is connected to the hollow interlayer of the overflow prevention box (8), and the other end of the overflow pipe (9) is connected to the return pipe (27); and a connecting male head (10) is fixedly installed at the rear end of the tank body (7) of the first-stage cooling water tank (1).

3. A nylon tube extrusion cooling device according to claim 2, characterized in that: A female connector (11) is fixedly mounted on the front end of the tank body (7) of the tail section cooling water tank (2), and an anti-overflow box (8) similar to that on the first section cooling water tank (1) is fixedly mounted on the rear end of the tank body (7) of the tail section cooling water tank (2), and an overflow pipe (9) is also connected to the bottom of the anti-overflow box (8) to connect to the return pipe (27).

4. A nylon tube extrusion cooling device according to claim 3, characterized in that: The front end of the trough body (7) of the middle cooling water trough (3) is fixedly mounted with a female connecting head (11), and the rear end is fixedly mounted with a male connecting head (10). A connecting groove (18) is provided inside the female connecting head (11), and a circle of sealing gaskets (19) is provided at the bottom of the connecting groove (18). The shape and size of the male connecting head (10) match the connecting groove (18), and a plurality of sealing rings (17) are embedded on the inner and outer surfaces of the male connecting head (10).

5. A nylon tube extrusion cooling device according to claim 4, characterized in that: Both ends of the trough body (7) are provided with partitions (16), and grooves for allowing the nylon tube to pass through are formed on the partitions (16). A plurality of rotating rollers (12) are fixedly mounted on the inner bottom surface of the trough body (7). A water inlet head (13) is mounted at the head position of the inner bottom surface of the trough body (7), and a water return port (14) is mounted at the tail position. A U-shaped head (20) is fixedly mounted on the top of the water inlet head (13), and a plurality of water outlet holes (21) are evenly formed on the inner annular surface of the U-shaped head (20). The water return port (14) is funnel-shaped, and its top surface is flush with the inner bottom surface of the trough body (7). A pair of temperature sensors (15) are respectively mounted on both sides of the water inlet head (13) and the water return port (14) on the inner bottom surface of the trough body (7). The temperature sensor (15) is connected to the control box (6) via a control line.

6. A nylon tube extrusion cooling device according to claim 5, characterized in that: The cooling circulation mechanism (5) comprises a heat exchanger (23), an integrated water tank (24) and a circulation pump (25); the heat exchanger (23) and the integrated water tank (24) are an integrated structure; one end of the return pipe (27) is connected to the return port (14), and the other end is connected to the inlet of the heat exchanger (23); one end of the outlet pipe (26) is connected to the water inlet head (13), and the other end is connected to the outlet of the circulation pump (25); and the inlet of the circulation pump (25) is connected to the integrated water tank (24) through a pipeline.

7. A nylon tube extrusion cooling device according to claim 6, characterized in that: A PLC controller and a human-machine interface are provided inside the control box (6). The PLC controller receives a temperature signal transmitted by a temperature sensor (15), and adopts a PID control algorithm to automatically adjust the flow rate of the circulation pump (25) and the cooling power of the heat exchanger (23) according to the deviation between the current temperature and the set temperature, so that the water temperature reaches the target value. The human-machine interface includes an interactive touch screen, and the cooling requirements of different nylon tubes, including the target water temperature and the gradient cooling curve, are set through the interactive touch screen.

8. A nylon tube extrusion cooling device according to claim 7, characterized in that: The interactive touch screen can also display the water inlet temperature, water outlet temperature, and working status information of the circulation pump (25) and the heat exchanger (23) of the corresponding module water tank (28) in real time. The interactive touch screen also integrates alarm display and reminder. When the water temperature is abnormal or the equipment fails, the alarm information is displayed and the sound alarm is sounded.

9. A nylon tube extrusion cooling device according to claim 8, characterized in that: A central control module is also integrated in the control box (6) of the first-stage cooling water tank (1). The central control module coordinates and controls all the control boxes (6), sets the water temperature gradient of different module water tanks (28) according to the cooling requirements of the nylon tube, and sends the target water temperature to each control box (6). The central control module also records the water temperature, flow rate, and equipment status data of each module water tank (28), and optimizes the cooling parameters through historical data analysis.

10. A nylon tube extrusion cooling device according to claim 9, characterized in that: The specific operations of linkage control performed by the central control module include: ①Set water temperature gradient: The central control module generates a gradient cooling curve through a built-in algorithm according to the cooling requirements of the nylon tube, including the tube diameter, wall thickness, extrusion speed and material properties, and divides the temperature intervals into the same number according to the number of module water tanks (28) actually installed, and sets the target water temperature respectively; the operator inputs the cooling requirement parameters through the human-machine interface, and the system automatically calculates and determines the target water temperature of each module water tank (28); ②Send the target water temperature to each control box: The central control module sends the target water temperature to the control box (6) of each module water tank (28) via the field bus; after the control box (6) receives the target water temperature, the internal PLC controller uses the PID control algorithm to adjust the flow rate of the circulation pump (25) and the cooling capacity of the heat exchanger (23) so that the water temperature is stabilized near the target value; the central control module monitors the water temperature changes of each module water tank (28) in real time and dynamically adjusts the instructions; ③Record the data of each cooling water tank: The central control module collects the water temperature, flow rate and equipment status data of each module water tank (28) in real time, and stores these data in a database, supporting long-term storage and historical query; through the human-machine interface, the operator can view the current data and historical records in real time; ④Optimize cooling parameters through historical data analysis: The central control module analyzes the stored historical data, identifies the optimization points in the cooling process, and automatically adjusts the cooling parameters.

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