Cold drum soft water circulation system for polyester film casting sheet

Abstract

The utility model discloses a polyester film casting sheet cold drum soft water circulation system which comprises a cold drum and a control device, a cooling water outlet of the cold drum is connected with a water inlet end of a water storage tank through an electromagnetic valve, a pipeline filter and a cooler, and a water outlet end of the water storage tank is connected with a cooling water inlet of the cold drum through a circulating pump and an electromagnetic valve; the water outlet end of the cold water tank is connected with the water return end of the cold water tank; the temperature transmitter, the water level sensor, the electronic water level gauge, the electronic thermometer, the electromagnetic valve and the compressor are electrically connected with the control device. According to the circulating water system, low-temperature softened water circulating at a high speed in the drum exchanges heat with the inside of the cold drum to take away heat of the cold drum, the working state of the cold drum is controlled through the controller, meanwhile, a cold source is provided through the compressor, heat exchange is conducted on the softened water and cooling water through the cooler, and the temperature transmitter and the electronic thermometer are arranged. The water temperature of the cold blast can be effectively guaranteed, and the softened water conveying and circulating device is very ideal.

Description

Technical Field

[0001] The utility model relates to auxiliary equipment for the production of polyester optical films, in particular to a polyester film casting cold drum soft water circulation system. Background Art

[0002] At present, the cooling drums used in large-scale polyester film production lines mainly have two structures: parallel flow channels and spiral flow channels. The flow direction of the cooling water in the flow channel is generally a unidirectional flow from one end of the cooling drum to the other end, and then returns to the heat exchanger. Strictly speaking, there is always more or less deviation in the lateral temperature of the cooling drum surface. Secondly, the cooling drum temperature has a certain influence on the apparent properties of the casting. The heat transfer of the cooling drum water temperature and its heat transfer rate not only affect the crystallinity of the polymer, but also affect the attachment effect of the melt. If the temperature is too high, the extruded sheet will stick to the drum surface, which is not conducive to the discharge of gas between the sheet and the cooling drum. This has a certain effect on preventing the casting from producing bubbles, ripples and other apparent quality defects. If the temperature is too low, the extruded sheet will slide or warp on the cooling drum surface. In view of the above technical deficiencies, it is necessary to design a polyester film casting cooling drum soft water circulation system. Summary of the Invention

[0003] The purpose of the utility model is to provide a polyester film casting sheet cold drum soft water circulation system in view of the defects in the prior art.

[0004] The technical solution is: a polyester film casting cold drum soft water circulation system, including a cold drum, a pipeline filter, a circulation pump, a cooler, a solenoid valve, a water storage tank, a cold water tank and a control device, the water storage tank is provided with an electric heating tube and a water level sensor, a water supply solenoid valve is provided on one side of the water storage tank, an electronic water level gauge, an electronic thermometer and a water supply solenoid valve are provided on the cold water tank, a condenser is provided in the cold water tank, the condenser is connected to a compressor arranged outside the cold water tank, and the compressor is connected to a radiator, characterized in that: the cooling water outlet pipe of the cold drum is connected to the medium input end of the cooler through the first solenoid valve, the first pipeline filter and the second solenoid valve pipe in sequence, and the medium of the cooler is connected to the cooling water outlet pipe of the cold drum through the first solenoid valve, the first pipeline filter and the second solenoid valve pipe in sequence. The output end of the quality is connected to the water inlet end of the water tank through the third solenoid valve pipeline. A temperature transmitter is provided on the water inlet pipeline of the water tank. The water outlet end of the water tank is connected to the cooling water inlet pipeline of the cold drum through the first circulation pump and the fifth solenoid valve pipeline; the water outlet end of the cold water tank is connected to the return water end of the cold water tank through the sixth solenoid valve, the second pipeline filter, the seventh solenoid valve, the cooling water ends of the cooler and the eighth solenoid valve pipeline in sequence; the temperature transmitter, water level sensor, electronic water level gauge and electronic thermometer are respectively electrically connected to the input end of the control device, and the first to eighth solenoid valves, water supply solenoid valve, water addition solenoid valve and compressor are respectively electrically connected to the output end of the control device.

[0005] Furthermore, a ninth solenoid valve and a tenth solenoid valve are respectively provided on the pipes at both ends of the first pipe filter; an eleventh solenoid valve and a twelfth solenoid valve are respectively provided on the pipes at both ends of the first pipe filter.

[0006] Furthermore, the control device is a programmable controller.

[0007] Furthermore, the cooler is a shell and tube cooler.

[0008] Compared with the existing technology, the present invention has the following advantages: reasonable design, simple structure, low power consumption, low pipe wear, low noise, and easy maintenance. During operation, the circulating water system exchanges heat with the cold drum through the low-temperature softened water circulating at high speed in the drum, taking away the heat transferred to the cold drum by the melt, and controls the working state of the cold drum through the intelligent controller. At the same time, the compressor system is used to provide a cooling source, and the cooler is used to exchange heat between the softened water and the cooling water, effectively isolating tap water from softened water, which can effectively save the loss of softened water. By setting a temperature transmitter and an electronic thermometer, the water temperature of the cold drum can be effectively guaranteed. It is an ideal softened water transportation and circulation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a structural diagram of an embodiment of the utility model;

[0010] Figure 2 It is a circuit block diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0011] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0012] Reference Figure 1-2, a polyester film casting cold drum soft water circulation system, comprising a cold drum 1, a pipeline filter, a circulation pump, a cooler 2, a solenoid valve, a water storage tank 3, a cold water tank 4 and a control device 30, wherein the water storage tank 3 is provided with an electric heating pipe 31 and a water level sensor 32, a water supply solenoid valve 33 is provided on one side of the water storage tank 3, the cold water tank 4 is provided with an electronic water level gauge 41, an electronic thermometer 42 and a water supply solenoid valve 43, a condenser 44 is provided in the cold water tank 4, the condenser 44 is connected to a compressor 45 arranged outside the cold water tank 4, and the compressor 45 is connected to a radiator 46; the cooling water outlet pipe of the cold drum 1 is connected to the medium input end of the cooler 2 through a first solenoid valve 5, a first pipeline filter 6 and a second solenoid valve 7 in sequence, and the cooler 2 The medium output end is connected to the water inlet end of the water tank 3 through the third solenoid valve 9 pipeline. A temperature transmitter 10 is provided on the water inlet pipeline of the water tank 3. The water outlet end of the water tank 3 is connected to the cooling water inlet pipeline of the cold drum 1 through the circulating pump 8 and the first and fifth solenoid valves 11 pipelines; the water outlet end of the cold water tank 4 is connected to the return water end of the cold water tank through the second circulating pump 12, the sixth solenoid valve 13, the second pipeline filter 14, the seventh solenoid valve 15, the cooling water ends of the cooler 2 and the eighth solenoid valve 16 pipeline in sequence; the temperature transmitter 10, the water level sensor 32, the electronic water level gauge 41 and the electronic thermometer 42 are respectively electrically connected to the input end of the control device, and the first to seventh solenoid valves and the compressor are respectively electrically connected to the output end of the control device 30.

[0013] An eighth solenoid valve 17 and a ninth solenoid valve 18 are respectively provided on the pipes at both ends of the first pipe filter 6; a tenth solenoid valve 19 and an eleventh solenoid valve 20 are respectively provided on the pipes at both ends of the second pipe filter 14; and the control device 30 is a programmable controller.

[0014] During operation, the water replenishment solenoid valve 34 and the water addition solenoid valve 43 are connected to the tap water pipeline, the control device 30 is connected to the power supply and controls the first circulation pump 8 to operate, and opens the first solenoid valve 5, the second solenoid valve 7, the third solenoid valve 9 and the fifth solenoid valve 11. Under the action of the first circulation pump 8, the water in the water storage tank 3 passes through the fifth solenoid valve 11 and enters the cooling water inlet pipeline of the cold drum 1 to cool the cold drum 1. The hot water coming out of the cooling water outlet pipeline of the cold drum 1 passes through the first solenoid valve 5, the first pipeline filter 6 and the second solenoid valve 7 and enters the medium circulation end of the cooler 2 for heat exchange and cooling, and then enters the water storage tank 3 through the third solenoid valve 9 to complete the cooling of the cold drum 1. At the same time, the control device 30 controls the opening of the second circulation pump 12, the sixth solenoid valve 13, the seventh solenoid valve 15 and the eighth solenoid valve 16 Under the action of the second circulation pump 12, the cold water in the cold water tank 4 passes through the second pipe filter 14, the seventh solenoid valve 15, the cooling water port of the cooler 2, and the eighth solenoid valve 16 and returns to the cold water tank 4. This circulation provides a cooling source for the cooler 2. During the above operation: 1) the control device 30 monitors the water temperature in the cold water tank 4 via the electronic thermometer 42. When the water temperature is above 20°C, it controls the compressor 45 to start and cool the water in the cold water tank 4. When the water temperature is below 8°C, it controls the compressor 45 to stop. 2) The control device 30 monitors the water temperature in the water inlet pipe of the water storage tank 3 via the temperature transmitter 32. When the water temperature is below 5°C, the control device controls the electric heating pipe 31 to energize and heat the water in the water storage tank 3. When the water temperature is above 20°C, the control device 30 controls the electric heating pipe 31 to de-energize and stop heating. The electric heating pipe 31 mainly starts to operate when the production line is started or when the softened water temperature is too low to ensure that the circulating water temperature remains within the set range.

[0015] When the first pipeline filter 6 and the second pipeline filter 14 are blocked, the control device 30 closes the first to seventh solenoid valves, the compressor, the first circulation pump 8 and the second circulation pump 12, opens the eighth solenoid valve 17, the ninth solenoid valve 18, the tenth solenoid valve 19 and the eleventh solenoid valve 20, and cleans the first pipeline filter 6 in the forward and reverse directions by connecting the tap water pipe or the gas pipe line to the outer end of the eighth solenoid valve 17 or the outer end of the ninth solenoid valve 18; cleans the second pipeline filter 14 in the forward and reverse directions by connecting the tap water pipe or the gas pipe line to the outer end of the tenth solenoid valve 19 or the outer end of the eleventh solenoid valve 20.

[0016] The electronic water level gauge 41 is used to monitor the water level of the cold water tank 4. When the water level is lower than the set value, the control device 30 immediately opens the water adding solenoid valve 43 to replenish water for the cold water tank 4. When the water level reaches the set value, the water adding solenoid valve 43 is closed.

[0017] The water level sensor 32 is used to monitor the water level of the water tank 3. When the water level is lower than the set value, the control device 30 immediately opens the water replenishment solenoid valve 33 to replenish water, and closes the water replenishment solenoid valve 33 when the water level reaches the set value.

[0018] The utility model has a reasonable design, simple structure, low power consumption, small pipe wear, low noise, and is easy to handle during maintenance. During operation, the circulating water system exchanges heat with the cold drum through the low-temperature softened water circulating at high speed in the drum, taking away the heat transferred to the cold drum by the melt, and controls the working state of the cold drum through the intelligent controller. At the same time, the compressor system is used to provide a cooling source, and the cooler is used to exchange heat between the softened water and the cooling water, effectively isolating tap water from softened water, which can effectively save the loss of softened water. By setting a temperature transmitter and an electronic thermometer, the water temperature of the cold drum can be effectively guaranteed. It is an ideal softened water transportation and circulation device.

[0019] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A polyester film casting cooling drum soft water circulation system, comprising a cooling drum, a pipe filter, a circulation pump, a cooler, a solenoid valve, a water storage tank, a cold water tank, and a control device. The water storage tank is provided with an electric heating pipe and a water level sensor, a water replenishment solenoid valve is provided on one side of the water storage tank, an electronic water level gauge, an electronic thermometer, and a water replenishment solenoid valve are provided on the cold water tank, a condenser is provided in the cold water tank, the condenser is connected to a compressor provided outside the cold water tank, and the compressor is connected to a radiator. The system is characterized in that: The cooling water outlet pipe of the cold drum is connected to the medium input end of the cooler in sequence through the first solenoid valve, the first pipe filter and the second solenoid valve pipe, the medium output end of the cooler is connected to the water inlet end of the water tank through the third solenoid valve pipe, the water inlet pipe of the water tank is provided with a temperature transmitter, and the water outlet end of the water tank is connected to the cooling water inlet pipe of the cold drum through the first circulation pump and the fifth solenoid valve pipe; the water outlet end of the cold water tank is connected to the return water end of the cold water tank in sequence through the sixth solenoid valve, the second pipe filter, the seventh solenoid valve, the cooling water ends of the cooler and the eighth solenoid valve pipe; the temperature transmitter, water level sensor, electronic water level gauge and electronic thermometer are respectively electrically connected to the input end of the control device, and the first to eighth solenoid valves, water supply solenoid valve, water addition solenoid valve and compressor are respectively electrically connected to the output end of the control device.

2. The polyester film casting cold drum soft water circulation system according to claim 1, characterized in that: A ninth solenoid valve and a tenth solenoid valve are respectively provided on the pipes at both ends of the first pipe filter; an eleventh solenoid valve and a twelfth solenoid valve are respectively provided on the pipes at both ends of the first pipe filter.

3. The polyester film casting cold drum soft water circulation system according to claim 1, characterized in that: The control device is a programmable controller.

4. The polyester film casting cooling drum soft water circulation system according to claim 1, characterized in that: The cooler is a shell and tube cooler.

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