A track cooling control device for a transverse stretching section of a plastic film production line

Abstract

The utility model relates to the technical field of plastic film production, especially a track cooling control device of plastic film production line horizontal stretch section, apply to the both sides track of horizontal stretch section, including internal cooling circuit, outer cooling pipeline, heat exchanger and temperature sensor and cooling control assembly, internal cooling circuit is embedded in the inside of track, is used for cooling track, temperature sensor is used for monitoring the temperature of internal cooling circuit, cooling control assembly is used for controlling the flow condition of outer cooling medium in outer cooling pipeline, internal cooling circuit and outer cooling pipeline all pass through heat exchanger, and internal cooling circuit and outer cooling pipeline do not communicate, and heat exchanger realizes the heat exchange between the inner cooling medium in internal cooling circuit and the outer cooling medium of outer cooling pipeline, temperature sensor and cooling control assembly electricity are coupled, the utility model can realize the accurate control of track temperature, improve the stability and intelligent level of cooling system.

Description

Technical Field

[0001] This utility model relates to the field of plastic film production technology, and in particular to a track cooling control device for the transverse stretching section of a plastic film production line. Background Technology

[0002] In a plastic film production line, the transverse stretching section is a crucial step in film formation. It primarily stretches the film laterally using chains (running within a track) located on both sides of the oven. Therefore, the chains and track are core components of the transverse stretching mechanism. Due to the high temperature inside the oven and the heat generated by chain-track friction, the temperature stability of the chains and track directly affects the operating efficiency of the production equipment and the quality of the film.

[0003] The existing utility model patent, patent number CN203031842U, discloses a "track cooling device for the transverse stretching section of a plastic film production line". It solves the problem of carbon buildup in lubricating oil by setting up bottom cooling boxes and side cooling boxes at the bottom and sides of the track, using heat transfer oil as the heat transfer medium, and realizing cooling circulation through an indirect heat exchanger.

[0004] However, existing technologies still have the following shortcomings: First, they rely on heat transfer oil as the heat transfer medium, which poses a risk of leakage, and the heat exchange efficiency is limited by the oil temperature conduction; second, they lack a precise temperature control mechanism, making it impossible to achieve constant temperature control of the track; and third, they lack a comprehensive status monitoring system, making it difficult to detect pipeline blockages, leaks, and other faults in real time, which can easily lead to equipment shutdown or damage. Therefore, there is an urgent need for a track cooling device that can achieve precise temperature control, intelligent monitoring, and higher heat exchange efficiency. Utility Model Content

[0005] The purpose of this invention is to propose a track cooling control device for the transverse stretching section of a plastic film production line, which addresses the shortcomings of existing technologies to achieve precise control of track temperature and improve the stability and intelligence level of the cooling system.

[0006] To achieve this objective, the present invention adopts the following technical solution: A track cooling control device for the transverse stretching section of a plastic film production line is applied to both sides of the track of the transverse stretching section, including an inner cooling circuit, an outer cooling pipe, a heat exchanger, a temperature sensor, and a cooling control component. The internal cooling circuit is embedded inside the track and is used to cool the track. The temperature sensor is used to monitor the temperature of the internal cooling circuit; The cooling control component is used to control the flow of the external cooling medium in the external cooling pipeline; Both the internal cooling circuit and the external cooling pipe pass through the heat exchanger, and the internal cooling circuit and the external cooling pipe are not connected. The heat exchanger realizes the heat exchange between the internal cooling medium in the internal cooling circuit and the external cooling medium in the external cooling pipe. The temperature sensor is electrically connected to the cooling control component.

[0007] Preferably, it also includes a flow detector, a supply tank, and a supply control assembly; The flow detector is used to monitor the flow rate of the internal cooling circuit; The supply tank is connected to the internal cooling circuit and is used to provide internal cooling medium to the internal cooling circuit; The supply control component is used to control the flow of the cooling medium inside the supply tank; The flow detector and the supply control component are electrically connected.

[0008] Preferably, the internal cooling circuit includes a circulating pump and two sub-internal cooling circuits; The two sub-internal cooling circuits are respectively embedded inside the tracks on both sides, and the two sub-internal cooling circuits are provided with a common water inlet and water outlet; The heat exchanger is provided with a cold internal medium outlet and a hot internal medium inlet; The water inlet is connected to the cold internal medium outlet through an internal water inlet pipe, and the water outlet is connected to the hot internal medium inlet through an internal water outlet pipe; The circulating pump is located in the inner water inlet pipe and is used to provide circulating power for the inner cooling medium; The circulating pump and the flow detector are electrically connected.

[0009] Preferably, the cooling control component includes a temperature control module and an E / P valve; The heat exchanger is equipped with a cold external medium inlet and a hot external medium outlet; The external cooling pipeline includes an external inlet water pipe and an external outlet water pipe; The cold external medium inlet is connected to the external cooling medium source through the external water inlet pipe, and the hot external medium outlet is connected to the cooling tower through the external water outlet pipe; The E / P valve is located on the external water inlet pipe; The temperature control module is electrically connected to the temperature sensor and the E / P valve, respectively.

[0010] Preferably, the supply control component includes a supply pump; The supply tank is connected to the internal water outlet pipeline via the supply pump; The supply pump and the flow detector are electrically connected.

[0011] Preferably, the replenishment control component further includes a replenishment solenoid valve and a liquid level sensor; The liquid level sensor is used to detect the liquid level in the supply tank; The replenishment solenoid valve is used to replenish the internal cooling medium in the replenishment tank; The supply solenoid valve and the liquid level sensor are electrically connected.

[0012] Preferably, a high-pressure sensor is provided on the inner water inlet pipe, and the high-pressure sensor is electrically connected to the circulating pump.

[0013] Preferably, a low-pressure sensor is provided on the inner water outlet pipe, and the low-pressure sensor is electrically connected to the replenishment pump.

[0014] One of the above technical solutions has the following beneficial effects: 1. Improve heat exchange efficiency and reduce safety risks: The internal cooling circuit is directly attached to the heated surface of the track, replacing the indirect cooling method of heat transfer oil in the existing technology. Soft water can be used as the internal circulation medium to avoid the risk of heat transfer oil leakage. At the same time, the high specific heat capacity of water is used to improve the efficiency of heat absorption and transfer, thereby enhancing the cooling effect.

[0015] 2. Achieve precise temperature control of the track: The temperature is monitored in real time by temperature sensors, and the cooling control components dynamically adjust the flow rate of the external cooling medium to solve the problem of temperature fluctuation caused by the lack of precise temperature control in existing technologies. The track temperature is stabilized within a reasonable range to avoid high temperature accelerating wear of track components or low temperature affecting the film stretching quality.

[0016] 3. Optimize cooling structure and control logic: The design of embedding the internal cooling circuit inside the track improves the directness of heat exchange. The heat exchanger realizes heat exchange with internal and external media isolation. Combined with intelligent control logic, it ensures the stability and reliability of the cooling system, extends the service life of the equipment, and improves the quality of film production. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a cross-section of a track cooling control device for the transverse stretching section of a plastic film production line, as described in this utility model. Figure 2 This is a schematic diagram of the track cooling control device for the transverse stretching section of a plastic film production line according to this utility model. Figure 3 This is a schematic diagram of the control device for the track cooling control of the transverse stretching section of a plastic film production line according to this utility model. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] A track cooling control device for the transverse stretching section of a plastic film production line is applied to the tracks 100 on both sides of the transverse stretching section, including an inner cooling circuit, an outer cooling pipe, a heat exchanger H, a temperature sensor S1, and a cooling control component. The internal cooling circuit is embedded inside the track 100 and is used to cool the track 100; The temperature sensor S1 is used to monitor the temperature of the internal cooling circuit; The cooling control component is used to control the flow of the external cooling medium in the external cooling pipeline; Both the internal cooling circuit and the external cooling pipe pass through the heat exchanger H, and the internal cooling circuit and the external cooling pipe are not connected. The heat exchanger H realizes the heat exchange between the internal cooling medium in the internal cooling circuit and the external cooling medium in the external cooling pipe. The temperature sensor S1 is electrically connected to the cooling control component.

[0023] like Figure 1-2As shown, this track cooling control device achieves precise track cooling through a closed-loop mechanism of coordinated heat exchange between internal and external cooling circuits, temperature monitoring, and intelligent regulation. The specific process is as follows: The internal cooling circuit is embedded inside the track 100, directly contacting the heated surface of the track. It absorbs heat generated by friction and the production environment through an internal circulating medium, such as soft water, directly cooling the track. Both the internal cooling circuit and the external cooling pipes pass through the heat exchanger H, achieving indirect heat exchange. Specifically, the internal cooling medium, absorbing heat in the internal cooling circuit, transfers heat to the external cooling medium in the external cooling pipes, completing the heat transfer. The cooled internal cooling medium then flows back into the track to continue circulating, while the external cooling medium, absorbing heat, is discharged through the external cooling pipes to dissipate heat.

[0024] Furthermore, the temperature sensor S1 monitors the temperature of the internal cooling circuit in real time, which can also indirectly reflect the track temperature, and transmits the temperature signal to the cooling control component. The cooling control component adjusts the flow of the external cooling medium in the external cooling pipe according to the received temperature data: when the temperature exceeds the set threshold, the flow rate of the external cooling medium is increased to enhance the heat exchange efficiency; when the temperature is lower than the set threshold, the flow rate of the external cooling medium is reduced, thereby dynamically maintaining the stability of the track temperature.

[0025] It should be noted that the track 100 includes a chain track 101, a chain clamp 102, a chain seat 103, and a slider 104. An internal cooling circuit is mainly formed inside the chain track 101 along its length to allow the flow of internal cooling medium, thereby cooling the track 100.

[0026] Further details also include the flow detector S4, the supply tank B, and the supply control assembly; The flow detector S4 is used to monitor the flow rate of the internal cooling circuit; The supply tank B is connected to the internal cooling circuit and is used to provide internal cooling medium to the internal cooling circuit; The supply control component is used to control the flow of the cooling medium inside the supply tank B; The flow detector S4 is electrically connected to the supply control component.

[0027] Specifically, the flow detector S4 monitors the flow rate of the medium in the internal cooling circuit in real time and continuously collects flow status data. When the flow rate in the internal cooling circuit decreases due to medium evaporation, minor leakage, or partial blockage of the pipeline, the flow detector S4 transmits an abnormal signal to the supply control component.

[0028] The replenishment tank B serves as a reserve source of the internal cooling medium and is connected to the internal cooling circuit via connecting pipes. After receiving the signal from the flow detector S4, the replenishment control component automatically starts the medium replenishment mechanism: the internal cooling medium in the replenishment tank B is delivered to the internal cooling circuit until the flow detector S4 detects that the circuit flow has returned to the normal range, at which point the replenishment control component shuts down the replenishment action, forming a dynamic balance of "monitoring-replenishment-feedback".

[0029] To further explain, the internal cooling circuit includes a circulating pump M1 and two sub-internal cooling circuits GN1; The two sub-internal cooling circuits GN1 are respectively embedded inside the tracks on both sides, and the two sub-internal cooling circuits GN1 are provided with a common water inlet and water outlet; The heat exchanger H is provided with a cold internal medium outlet and a hot internal medium inlet; The water inlet is connected to the cold internal medium outlet through the internal water inlet pipe GN2, and the water outlet is connected to the hot internal medium inlet through the internal water outlet pipe GN3; The circulating pump M1 is installed in the inner water inlet pipe GN2 and is used to provide circulating power for the internal cooling medium. The circulating pump M1 and the flow detector S4 are electrically connected.

[0030] First, the internal cooling circuit includes two sub-internal cooling circuits GN1, which are embedded inside the rails on both sides of the transverse stretching section, directly contacting the heated surfaces of the rails. The two sub-circuits share a single inlet and outlet, ensuring a balanced supply of cooling medium to the rails on both sides and avoiding temperature differences in the rails caused by uneven cooling on one side.

[0031] Secondly, the internal cooling medium, such as soft water, flows out from the cold internal medium outlet of the heat exchanger H under the drive of the circulating pump M1. It is then distributed to the two sub-internal cooling circuits GN1 through the internal water inlet pipe GN2. After absorbing the heat from the two side rails 100, it is collected at the outlet and flows back to the hot internal medium inlet of the heat exchanger H through the internal water outlet pipe GN3. The heat is then transferred to the external cooling pipe through the heat exchanger H, thus completing the heat transfer.

[0032] Furthermore, the flow detector S4 monitors the medium flow rate in the internal cooling circuit. It can be connected in series with the internal inlet or outlet water pipe and electrically connected to the circulating pump M1 to form feedback control. When the flow detector S4 detects that the flow rate is lower than a preset threshold, such as due to insufficient medium or pipe blockage, it triggers the shutdown protection of the circulating pump M1 to prevent the pump body from running dry and being damaged. When the flow rate returns to normal, the circulating pump M1 can be restarted to ensure that the medium circulation is always within a safe and effective flow range.

[0033] To further explain, the cooling control assembly includes a temperature control module A1 and an E / P valve A2; The heat exchanger H is provided with a cold external medium inlet and a hot external medium outlet; The external cooling pipeline includes an external water inlet pipe GW1 and an external water outlet pipe GW2; The cold external medium inlet is connected to the external cooling medium source through the external water inlet pipe GW1, and the hot external medium outlet is connected to the cooling tower T through the external water outlet pipe GW2; The E / P valve A2 is located on the external water inlet pipe GW1; The temperature control module A1 is electrically connected to the temperature sensor S1 and the E / P valve A2, respectively.

[0034] Specifically, temperature sensor S1 monitors the temperature of the medium in the internal cooling circuit in real time, indirectly reflecting the track temperature, and continuously transmits the temperature signal to temperature control module A1. Temperature control module A1 presets a track temperature control range, such as 93℃~98℃, as the control benchmark.

[0035] E / P valve A2 is installed on the external water inlet pipe GW1 and is used to regulate the flow rate of the external cooling medium entering the heat exchanger H. After receiving the signal from temperature sensor S1, temperature control module A1 analyzes the deviation between the current temperature and the set range using a PID control algorithm. When the detected temperature is higher than the set upper limit, the temperature control module A1 controls the E / P valve A2 to increase the opening, increase the flow of the external cooling medium into the heat exchanger, enhance the heat exchange efficiency between the internal and external cooling media, and accelerate the cooling of the internal cooling medium. When the detected temperature is lower than the set lower limit, the temperature control module A1 controls the E / P valve A2 to reduce the opening, reduce the flow of external cooling medium, reduce the heat exchange intensity, and avoid excessive cooling of internal cooling medium.

[0036] Moreover, the external cooling medium that absorbs heat enters the cooling tower T through the outgoing water pipe GW2 to dissipate heat, and after cooling, it can be recycled as a source of external cooling medium.

[0037] In an optional embodiment, the temperature control module A1 uses a CH402 temperature controller.

[0038] To further explain, the supply control component includes a supply pump M2; The supply tank B is connected to the internal water outlet pipe GN3 via the supply pump M2; The supply pump M2 and the flow detector S4 are electrically connected.

[0039] Specifically, when the flow rate in the internal cooling circuit decreases due to medium evaporation, minor leakage, or other reasons, and the flow detector S4 detects that the flow rate is below the normal threshold, the replenishment pump M2 is triggered to start. When the replenishment pump M2 is running, it pressurizes and delivers the internal cooling medium, such as soft water, from the replenishment tank B to the outlet pipe, replenishing the internal cooling circuit. The replenishment pump M2 automatically shuts down and stops replenishing the circuit once the flow detector S4 detects that the circuit flow rate has returned to the normal range.

[0040] Furthermore, the replenishment control assembly also includes a replenishment solenoid valve A3 and a liquid level sensor S5; The liquid level sensor S5 is used to detect the liquid level in the supply tank B; The replenishment solenoid valve A3 is used to replenish the internal cooling medium to the replenishment tank B.

[0041] The supply solenoid valve A3 and the liquid level sensor S5 are electrically connected.

[0042] Specifically, when the liquid level in supply tank B drops due to the replenishment of medium into the internal cooling circuit, and the liquid level sensor S5 detects that the liquid level is below a preset threshold, it triggers the opening of the supply solenoid valve A3. An external medium source injects internal cooling medium into supply tank B through the solenoid valve. As the medium is injected, the liquid level in the supply tank gradually rises. When the liquid level sensor S5 detects that the liquid level has returned to the normal range, the supply solenoid valve A3 automatically closes, stopping the replenishment.

[0043] To further explain, a high-pressure sensor S2 is installed on the internal water inlet pipe GN2, and the high-pressure sensor S2 is electrically connected to the circulating pump M1.

[0044] When the internal cooling circuit pressure rises due to abnormal conditions such as impurities clogging or pipe deformation, and the pressure value detected by the high-pressure sensor S2 exceeds the aforementioned set threshold, the circulating pump M1 is immediately triggered to stop. This design can quickly respond to pipe blockage faults, prevent the circulating pump M1 from running continuously under high load conditions, thus avoiding motor overload damage, and at the same time prevent more serious equipment failures such as rupture and leakage of the internal cooling circuit due to overpressure.

[0045] To further explain, a low-pressure sensor S3 is installed on the internal water outlet pipe GN3, and the low-pressure sensor S3 is electrically connected to the replenishment pump M2.

[0046] When the water volume in the internal cooling circuit is insufficient due to medium evaporation, minor leakage, or other reasons, the pressure in the outlet pipe G3 will drop. When the low-pressure sensor S3 detects that the pressure is below the threshold, it immediately triggers the start of the replenishment pump M2, replenishing the internal cooling circuit with soft water from the replenishment tank B. This design accurately responds to water shortage issues, preventing a decrease in cooling efficiency due to medium shortage, ensuring that the internal cooling circuit is always full of internal cooling medium to maintain stable heat exchange, effectively preventing abnormal temperature on the track due to insufficient cooling, and ensuring continuous and effective operation.

[0047] To further illustrate the working principle of this device, a specific embodiment is provided, such as... Figure 3 As shown, the specific process is as follows: First, a 230Vac AC power supply is connected, which is converted into a stable 24Vdc DC power supply by the AC / DC module. Power is supplied to low-voltage components such as temperature sensor S1, high-pressure sensor S2, low-pressure sensor S3, flow sensor S4, liquid level sensor S5, and CH402 temperature control module A1 through power switches Q1 and Q2. The main circuit provides power to high-voltage components such as circulation pump M1 and replenishment pump M2 through fuses Fu / Fu1 / Fu2 to ensure circuit safety.

[0048] Among them, temperature sensor S1 detects the temperature of the track chain, high-pressure sensor S2 and low-pressure sensor S3 monitor pipeline pressure, flow sensor S4 detects the flow rate of the medium, and level sensor S5 monitors the level of the supply tank. The sensor signals are transmitted to relays k1-k5, which convert the weak signals into strong electrical signals that can drive the contactors, thus achieving reliable signal transmission.

[0049] The CH402 temperature control module A1 serves as the core control unit. When relay k1 is energized, its normally open contact k1' closes, energizing and opening E / P valve A2. It also receives the temperature signal from temperature sensor S1 and controls the opening of E / P valve A2 through PID regulation: when the track temperature exceeds the set value, relay k1 is triggered to control E / P valve A2 to increase the cooling water flow and enhance heat exchange; when the temperature is too low, the flow rate is reduced.

[0050] When the high-pressure sensor S2 detects that the pressure exceeds the threshold, the relay k2 is energized and its normally closed contact k2' opens, causing the contactor Km1 controlling the circulating pump M1 to de-energize and disconnect. At the same time, the normally open contact Km1' of the contactor Km1 controlling the circulating pump M1 also opens, stopping the circulating pump M1 and preventing overpressure in the pipeline.

[0051] When the low-pressure sensor S3 detects that the pressure is too low, the relay k3 is energized and its normally open contact k3' closes, which causes the contactor Km2' that controls the replenishment pump M2 to close, and the replenishment pump M2 starts to replenish water.

[0052] When the flow sensor S4 detects an abnormal flow, it energizes the relay k4, causing its normally closed contact k4' to open. This de-energizes the contactor Km1 controlling the circulating pump M1, and simultaneously opens the normally open contact Km1' of the contactor Km1 controlling the circulating pump M1, stopping the circulating pump M1 and preventing it from running dry, burning out, or being damaged.

[0053] When the liquid level sensor S5 detects insufficient liquid level, it energizes the relay k5, causing its normally open contact k5' to close, and energizing the water replenishment solenoid valve A3 to open and replenish the liquid.

[0054] Furthermore, fuses Fu / Fu1 / Fu2 and thermal protection relays Fr1 / Fr2 respectively prevent short circuits and motor overloads; power indicator L1 displays the system power supply status, and running indicator L2 provides feedback on the equipment's operating status; the start button ST, stop button SB, and manual switch SW support manual intervention to ensure controllable operation in emergencies. For example, when the start button ST of the circulating pump M1 is pressed, contactor Km1 engages, controlling the normally open contact Km1' of the start button ST to close, triggering a self-locking control circuit. Simultaneously, the normally open contact Km1' of contactor Km1 of the circulating pump M1 also closes, starting the circulating pump M1.

[0055] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without inventive effort, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A track cooling control device for the transverse stretching section of a plastic film production line, applied to the tracks (100) on both sides of the transverse stretching section, characterized in that, Includes an internal cooling circuit, external cooling piping, a heat exchanger (H), a temperature sensor (S1), and cooling control components; The internal cooling circuit is embedded inside the track (100) and is used to cool the track (100); The temperature sensor (S1) is used to monitor the temperature of the internal cooling circuit; The cooling control component is used to control the flow of the external cooling medium in the external cooling pipeline; Both the internal cooling circuit and the external cooling pipe pass through the heat exchanger (H), and the internal cooling circuit and the external cooling pipe are not connected. The heat exchanger (H) realizes the heat exchange between the internal cooling medium in the internal cooling circuit and the external cooling medium in the external cooling pipe. The temperature sensor (S1) is electrically connected to the cooling control component.

2. The track cooling control device for the transverse stretching section of a plastic film production line according to claim 1, characterized in that, It also includes a flow detector (S4), a supply tank (B), and a supply control assembly; The flow detector (S4) is used to monitor the flow rate of the internal cooling circuit; The supply tank (B) is connected to the internal cooling circuit and is used to provide internal cooling medium to the internal cooling circuit; The supply control component is used to control the flow of the cooling medium inside the supply tank (B); The flow detector (S4) and the supply control component are electrically connected.

3. The track cooling control device for the transverse stretching section of a plastic film production line according to claim 2, characterized in that, The internal cooling circuit includes a circulation pump (M1) and two sub-internal cooling circuits (GN1). The two sub-internal cooling circuits (GN1) are respectively embedded inside the two sides of the track (100), and the two sub-internal cooling circuits (GN1) are provided with a common water inlet and water outlet; The heat exchanger (H) is provided with a cold internal medium outlet and a hot internal medium inlet; The water inlet is connected to the cold internal medium outlet through an internal water inlet pipe (GN2), and the water outlet is connected to the hot internal medium inlet through an internal water outlet pipe (GN3). The circulating pump (M1) is located in the inner water inlet pipe (GN2) and is used to provide circulating power for the internal cooling medium; The circulating pump (M1) and the flow detector (S4) are electrically connected.

4. The track cooling control device for the transverse stretching section of a plastic film production line according to claim 1, characterized in that, The cooling control assembly includes a temperature control module (A1) and an E / P valve (A2). The heat exchanger (H) is provided with a cold external medium inlet and a hot external medium outlet; The external cooling pipeline includes an external water inlet pipe (GW1) and an external water outlet pipe (GW2). The cold external medium inlet is connected to the external cooling medium source through the external water inlet pipe (GW1), and the hot external medium outlet is connected to the cooling tower (T) through the external water outlet pipe (GW2); The E / P valve (A2) is located on the external water inlet pipe (GW1). The temperature control module (A1) is electrically connected to the temperature sensor (S1) and the E / P valve (A2) respectively.

5. The track cooling control device for the transverse stretching section of a plastic film production line according to claim 3, characterized in that, The supply control component includes a supply pump (M2); The supply tank (B) is connected to the internal water outlet pipe (GN3) via the supply pump (M2); The supply pump (M2) and the flow detector (S4) are electrically connected.

6. The track cooling control device for the transverse stretching section of a plastic film production line according to claim 5, characterized in that, The supply control assembly also includes a supply solenoid valve (A3) and a liquid level sensor (S5). The liquid level sensor (S5) is used to detect the liquid level in the supply tank (B); The supply solenoid valve (A3) is used to supply internal cooling medium to the supply tank (B); The supply solenoid valve (A3) and the level sensor (S5) are electrically connected.

7. The track cooling control device for the transverse stretching section of a plastic film production line according to claim 3, characterized in that, A high-pressure sensor (S2) is installed on the internal water inlet pipe (GN2), and the high-pressure sensor (S2) is electrically connected to the circulating pump (M1).

8. The track cooling control device for the transverse stretching section of a plastic film production line according to claim 5, characterized in that, The internal water outlet pipe (GN3) is equipped with a low-pressure sensor (S3), which is electrically connected to the replenishment pump (M2).

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