Water circulation cooling system for extrusion shaping of PP (polypropylene) mute drain pipe

Abstract

The utility model discloses a water circulation cooling system for extrusion shaping of a PP mute drain pipe. The problem that the temperature of cooling water provided by an existing cooling system is single is solved. The cooling device comprises a cooling cylinder connected to the downstream of the extruder, and further comprises a water return pipe correspondingly connected between a water outlet and a water inlet of the cooling cylinder, a water mixing pump correspondingly communicated with the water return pipe through a water mixing three-way valve and correspondingly communicated with a cold water pool, and a water mixing temperature sensor arranged in the water return pipe and corresponding to the downstream of the water mixing three-way valve. High-temperature outlet water of the cooling cylinder is introduced into a water inlet of the cooling cylinder through a water return pipe for cyclic utilization, and the temperature of return water in the water return pipe is reduced through a water mixing pump and a water mixing three-way valve; and the natural cooling of the rich water body is realized through the natural cooling pool or the radiating fin group, and the cooled water body can enter the system again for recycling. Therefore, the cooling cost is reduced while the repeated utilization rate of the water body is improved.

Description

Technical Field

[0001] This application relates to the technical field of pipe extrusion equipment, and specifically relates to a water circulation cooling system for extrusion and shaping of PP sound-proof drain pipes. Background Art

[0002] PP sound-proof drain pipes are drain pipes made of polypropylene materials, which have excellent properties such as high temperature resistance, corrosion resistance, pressure resistance, and toughness. At the same time, it also has the advantages of low noise, anti-condensation, aging resistance, and easy installation. PP sound-proof drain pipes are generally actually produced using an extrusion production line. Among them, the cooling system of the extruder is an indispensable part of the extrusion production process. Its main function is to quickly cool the thermoplastic plastic after extrusion through the die head, so that it reaches the hardness and strength of the required product, thereby ensuring product quality and production efficiency.

[0003] The cooling system generally consists of parts such as a cooling tower, a cooling water tank, a water pump, a sensor, an inlet pipe, and an outlet pipe. Among them, the cooling water tank is a place to store the cooling water obtained after cooling by the cooling tower, and plays the role of storing and circulating the cooling water; the water pump is the core device that promotes the circulation of the cooling water and can be adjusted according to needs; the sensor is a device that monitors and feedbacks the temperature in real time, and plays the role of ensuring and controlling the temperature of the cooling water; the inlet pipe and the outlet pipe are used to introduce and discharge the cooling water circulation.

[0004] In order to improve the quality and efficiency of the extruded pipes, it is necessary to control the temperature of the cooling water relatively strictly. If the temperature of the cooling water is too high, it will cause insufficient cooling of the melt, poor appearance of the product, excessive post-shrinkage of the product, and unstable dimensions; if the temperature of the cooling water is too low, it will cause the melt to cool too quickly, imperfect crystallization, and internal stress in the product. However, in order to solve the problem of long natural cooling time in the existing production line, generally the high-temperature water after cooling is transported to the cooling tower for cooling and then reused. However, the cooling tower can only provide cooling water at one temperature at the same time. According to the theory of polymer plasticization and molding, PP sound-proof pipes require cooling water at different temperatures in different stages. The initial cooling water temperature should be slightly higher (about 28-30°C), which is more conducive to perfect crystallization of the product and stretching of molecular chains, eliminating internal stress, and thus improving its impact resistance.

[0005] The information disclosed in this background art section is only used to deepen the understanding of the background art of the present disclosure, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0006] In view of at least one of the above technical problems, the present disclosure provides a water circulation cooling system for extrusion and shaping of PP sound-proof drain pipes, aiming to solve the problem of single cooling water temperature provided by the existing cooling system.

[0007] According to one aspect of the present disclosure, a water circulation cooling system for extrusion and shaping of a PP silent drain pipe is provided, including a cooling cylinder connected downstream of an extruder, and further including a return pipe correspondingly connected between the water outlet and the water inlet of the cooling cylinder, a mixing water pump correspondingly connected to the return pipe through a mixing water three-way valve and correspondingly communicated with a cold water tank, and a mixing water temperature sensor disposed in the return pipe corresponding to the downstream of the mixing water three-way valve.

[0008] In some embodiments of the present disclosure, the water circulation cooling system for extrusion and shaping of a PP silent drain pipe further includes a return water temperature sensor disposed in the return pipe corresponding to the upstream of the three-way valve, and a cold water temperature sensor disposed between the cold water tank and the mixing water pump.

[0009] In some embodiments of the present disclosure, spiral convex ribs are provided on the inner wall of the pipe wall of the return pipe corresponding to the downstream of the three-way valve.

[0010] In some embodiments of the present disclosure, the water outlet of the cooling cylinder is correspondingly connected to the return pipe through a return water three-way valve, and the corresponding valve port of the return water three-way valve is connected to a natural cooling pool / heat dissipation fin group through a water delivery pipeline.

[0011] In some embodiments of the present disclosure, the natural cooling pool / heat dissipation fin group is connected to the cold water tank through a pipeline correspondingly provided with a cold water temperature sensor and a cold water valve.

[0012] In some embodiments of the present disclosure, the return water three-way valve and the mixing water three-way valve are proportional control valves and are respectively correspondingly communicatively connected to a controller.

[0013] One or more technical solutions provided in the embodiments of the present application have at least any one of the following technical effects or advantages:

[0014] The high-temperature water discharged from the cooling cylinder is introduced into the water inlet of the cooling cylinder through the return pipe for recycling, and the temperature of the return water in the return pipe is reduced through the mixing water pump and the mixing water three-way valve; and the natural cooling of the surplus water body is realized through the natural cooling pool or the heat dissipation fin group, and the cooled water body can re-enter the system for recycling. Thus, while improving the recycling rate of the water body, the cooling cost is reduced, and the water temperature requirement for the water inlet of the cooling cylinder is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the principle of the water circulation cooling system in an embodiment of the present application.

[0016] In the above figures, 1 is a cooling cylinder, 2 is a return water pipe, 3 is a mixing water three-way valve, 4 is a mixing water pipe, 5 is a mixing water pump, 6 is a cold water tank, 7 is a mixing water temperature sensor, 8 is a return water temperature sensor, 9 is a cold water temperature sensor, 10 is a return water three-way valve, 11 is a natural cooling pond, 12 is a cooling water temperature sensor, and 12 is a cooling water valve. Specific Embodiment

[0017] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. For the "connection" and "coupling" involved in the present application, unless otherwise specified, both direct and indirect connections (couplings) are included.

[0018] The programs involved or relied on in the following embodiments are all conventional programs or simple programs in the technical field. Those skilled in the art can make conventional selections or adaptive adjustments according to specific application scenarios. The components and the like involved in the following embodiments are all conventional commercially available products unless otherwise specified.

[0019] To better understand the technical solution of the present application, the above technical solution will be described in detail below in conjunction with the specification drawings and specific embodiments.

[0020] This example discloses a PP silent drain pipe extrusion and shaping water circulation cooling system. Refer to Figure 1 , this cooling system includes a cooling cylinder 1 provided downstream of the extruder. The extruded pipe passes through the sealed and internally evacuated cooling cylinder 1, and the pipe is cooled by vacuum spraying through the spraying device inside the cooling cylinder 1. Specifically, in this embodiment, two-stage cooling cylinders are provided in total. The outlet water temperature of the second-stage cooling cylinder is 40 ± 5 °C, and the cooling spray inlet water temperature of the first-stage cooling cylinder is required to be 20 ± 5 °C. The existing cooling system sends the outlet water of the second-stage cooling cylinder to the cooling tower for cooling, but it consumes a certain amount of electricity. To save the electricity cost, in this embodiment, a return water pipe 2 is provided between the outlet and inlet of the cooling cylinder.

[0021] The return water pipe 2 is used to lead the high-temperature outlet water in the cooling cylinder 1 back to the inlet of the cooling cylinder 1 to achieve recycling. However, since the inlet water of the cooling cylinder 1 has temperature requirements, the water body needs to be cooled. Therefore, refer to Figure 1, in this embodiment, a mixing three-way valve 3 is installed in the return pipe 2, and cold water is introduced into the return pipe 2 through this mixing three-way valve 3 for doping to meet the inlet water temperature requirement of the cooling cylinder 1. Specifically, two of the ports of the mixing three-way valve 3 are respectively connected to the return pipe 2, and the other port is connected to the mixing pipe 4. To achieve doping cold water into the return pipe 2 to reduce the return water temperature, in this embodiment, the mixing pipe 4 is connected to the cold water tank 6, and a mixing water pump 5 is connected in the mixing pipe 4. Thus, through the pumping effect of the mixing water pump 5, the cold water in the cold water tank is transported into the return pipe 2.

[0022] Different cold water delivery amounts in the mixing pipe 4 will affect the return water temperature in the return pipe 2. To achieve control of the return water temperature and ensure the quality of the pipe material cooling and forming. In this embodiment, a mixing water temperature sensor 7 is installed in the downstream pipeline of the mixing three-way valve 3 in the return pipe 2. The temperature of the mixed water body is measured by this mixing water temperature sensor 7, and the pumping volume of the mixing water pump 5 is adjusted accordingly, so that the return water temperature meets the spray inlet water temperature requirement of the cooling cylinder.

[0023] In addition, in this embodiment, considering that the mixing water temperature sensor 7 can only measure the temperature of the mixed water body, and its measurement result can only affect the water body temperature at a later time, it cannot guarantee the mixing water temperature before and during the measurement. To further ensure that the mixing water temperature is adjustable and controllable, see Figure 1 , a return water temperature sensor 8 is installed in the upstream pipeline of the mixing three-way valve 3 of the return pipe 2, and a cold water temperature sensor 9 is installed in the mixing pipe pipeline between the cold water tank 6 and the mixing water pump 5. Thus, the return water temperature and the cold water temperature are respectively measured by the return water temperature sensor 8 and the cold water temperature sensor 9. Before the water bodies are mixed by the mixing three-way valve 3, the doping amount of cold water in the return pipe is regulated according to the return water temperature, the cold water temperature, and the required inlet water temperature for the spray of the cooling cylinder, so that the water body flowing through the mixing water temperature sensor 7 can basically meet the cooling cylinder inlet water temperature requirement at the initial return water, and can be adjusted in advance before mixing according to the changes in the return water temperature and the cold water temperature, avoiding the influence on the pipe forming quality due to the water body not meeting the spray temperature requirement after mixing.

[0024] In this embodiment, to ensure that the water bodies downstream of the mixing three-way valve 3 can fully exchange heat, spiral ribs are provided on the inner wall of the return pipe 2 downstream of the mixing three-way valve 3. Thus, the heat exchange of the water bodies in the pipe is accelerated through the spiral ribs, ensuring the uniform consistency of the inlet water body temperature.

[0025] Since the spray water consumption of the cooling cylinder 1 is basically constant, as the water bodies in the cold water tank 6 are continuously added to the circulating water, this will cause the water volume in the cooling system to continuously increase and exceed the required amount of the system. For this reason, see Figure 1, in this embodiment, a return water three-way valve 10 is connected to the return water pipe at the water outlet of the cooling cylinder 1, and part of the water body is conveyed to the natural cooling pool 11 through the return water three-way valve 10 via the water conveying pipeline for natural cooling and temperature reduction. In this embodiment, the natural cooling pool 11 has a certain area to increase the heat exchange area between the water body and the surrounding air and improve the heat exchange efficiency. In some other embodiments, due to production environment limitations, such as insufficient space to set up a natural cooling pool or a large amount of environmental dust that easily causes the water body in the natural cooling pool to be polluted and mixed with impurities, etc., a natural cooling pool cannot be set up. Therefore, the return water three-way valve is connected to the heat dissipation fin group through the water conveying pipeline, thereby isolating the water body from the external environment, ensuring that the water body is not polluted, and realizing heat dissipation through the full contact between the fins and the air. Thus, by means of the natural cooling pool or the heat dissipation fin group, the participation of the cooling tower is reduced without affecting the normal operation of the cooling system, and even the cooling tower can be directly omitted, greatly reducing the production cost.

[0026] In this embodiment, both the return water three-way valve 10 and the mixing water three-way valve 3 are proportional control valves, and the two are respectively communicatively connected to the controller. In this example, the controller uses a PLC. The controller adjusts the opening degrees of the two three-way valves according to the temperatures of the return water temperature sensor 8 and the cold water temperature sensor 9, and uses the measured value of the mixing water temperature sensor 7 as the adjustment feedback. When the mixing water temperature is higher than the required temperature, the return water three-way valve 10 reduces the amount of water entering the return water pipe, and the mixing water three-way valve 3 correspondingly increases the amount of cold water entering the return water pipe; when the mixing water temperature is lower than the required temperature, the return water three-way valve 10 increases the amount of water entering the return water pipe, and the mixing water three-way valve 3 correspondingly reduces the amount of cold water entering the return water pipe, thereby realizing accurate on-demand control of the water inlet temperature of the cooling cylinder.

[0027] In addition, to realize the repeated recycling of the cooled water body in the natural cooling pool or the heat dissipation fin group, in this embodiment, the natural cooling pool 11 and the cold water pool 6 are connected through a pipeline, and a cooling water temperature sensor 12 and a cooling water valve 13 are provided in the pipeline connecting the two, which are respectively used to monitor the water temperature in the pipeline and the conduction of the pipeline, so that the cooled water body can enter the cold water pool for recycling, avoiding waste of water resources.

[0028] Although some preferred embodiments of the application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of this application.

[0029] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of its inventive concept. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application also intends to include these modifications and variations.

Claims

1. A water circulation cooling system for extrusion shaping of a PP silent drain pipe, comprising a cooling cylinder connected downstream of an extruder, characterized in that, It also includes a return water pipe correspondingly connected between the water outlet and the water inlet of the cooling cylinder, a mixing water pump correspondingly connected to the return water pipe through a mixing water three-way valve and correspondingly communicating with a cold water pool, and a mixing water temperature sensor arranged in the return water pipe corresponding to the downstream of the mixing water three-way valve.

2. The PP silent drain pipe extrusion and shaping water circulation cooling system according to claim 1, characterized in that It also includes a return water temperature sensor arranged in the return water pipe corresponding to the upstream of the three-way valve, and a cold water temperature sensor arranged between the cold water pool and the mixing water pump.

3. The PP silent drain pipe extrusion and shaping water circulation cooling system according to claim 1, characterized in that, Spiral ribs are provided on the inner wall of the pipe wall of the return water pipe corresponding to the downstream of the three-way valve.

4. The water circulation cooling system for extrusion and shaping of the PP sound-insulating drain pipe according to claim 1, wherein The water outlet of the cooling cylinder is correspondingly connected to the return water pipe through a return water three-way valve, and the corresponding valve port of the return water three-way valve is connected to a natural cooling pool / heat dissipation fin group through a water delivery pipeline.

5. The PP silent drain pipe extrusion and shaping water circulation cooling system according to claim 4, characterized in that, The natural cooling pool / heat dissipation fin group is connected to the cold water pool through a pipeline correspondingly provided with a cooling water temperature sensor and a cooling water valve.

6. The PP silent drain pipe extrusion and shaping water circulation cooling system according to claim 4, characterized in that, The return water three-way valve and the mixing water three-way valve are proportional control valves and are respectively correspondingly communicatively connected to a controller.

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