Rear-section cooling device of calender for PVC (polyvinyl chloride) film production

Abstract

The utility model relates to the technical field of plastic films, and discloses a rear-section cooling device of a calender for PVC film production, which comprises a box body and a calender body. According to the rear-section cooling device of the calender for PVC film production, by arranging the double-shaft motor and the tension sensor, when the tension degree of a film body needs to be adjusted, the tension sensor is started, the tension value of the film body can be monitored under the action of the tension sensor, and when the tension sensor detects that the tension of a film material changes, the tension value of the film body is monitored; the tension sensor can transmit a signal to the external controller, then the external controller starts the double-shaft motor to operate, the distance between the upper roller and the lower roller can be adjusted, the tensioning force of the PVC film can be adjusted by adjusting the distance between the upper roller and the lower roller, and the PVC film tensioning device has high adaptability and is suitable for popularization and application. The device can adapt to the extension characteristics of PVC materials with different formulas, and the cooling quality of PVC films with different formulas can be guaranteed.

Description

Technical Field

[0001] This application relates to the field of plastic film technology, specifically to a post-cooling device for a calender used in PVC film production. Background Technology

[0002] Calendering is commonly used in the production of plastic films or sheets. It involves passing molten thermoplastic through the gap between two or more parallel, counter-rotating rollers, causing the melt to be squeezed, stretched, and extended into a continuous sheet-like product with specific dimensions and quality requirements. Because the product experiences significant friction during calendering, the temperature of the freshly calendered product is high, and it cannot be stored immediately; it needs to be cooled first.

[0003] An existing patent (publication number: CN212920164U) discloses a cooling device for a PVC film calender, belonging to the field of plastic film technology. It includes a frame, a cooling roller, and a drive motor. A mounting hole is provided on one side wall of the frame, and a bearing is fixedly connected to the mounting hole. The cooling roller is hollow inside, and a connecting pipe connected to the cooling roller is fixed to one end face. The connecting pipe and the bearing are interference-fitted. The drive motor drives the end of the cooling roller away from the connecting pipe to rotate. A cooling mechanism is provided in the cooling roller, including a water tank, a water pump, a high-pressure water pipe, a rotary joint, a water supply pipe, and a nozzle. The water tank is located outside the frame and stores cooling water. The water pump is located inside the water tank, and its outlet is connected to one end of the high-pressure water pipe. The other end of the high-pressure water pipe passes through the connecting pipe and is connected to the inlet of the rotary joint. The water supply pipe is connected to the outlet of the rotary joint. The nozzle is connected to the water supply pipe and embedded in the side wall of the cooling roller, spraying cooling water from the nozzle towards the outside of the cooling roller. This application can improve cooling efficiency and ensure production efficiency.

[0004] While the device described in the aforementioned comparative document solves the problem of low cooling efficiency in PVC film cooling, it lacks an adjustment structure and cannot adjust the tension of the PVC film during cooling. Furthermore, the device's roller structure is fixed, making it unable to effectively adjust the PVC film and exhibiting poor adaptability, failing to accommodate the elongation characteristics of PVC materials with different formulations. To address these issues, a post-cooling device for a calender used in PVC film production is proposed. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides a post-cooling device for a calender used in PVC film production. This device has advantages such as an adjustable structure, which solves the problems of lacking an adjustable structure, being unable to effectively adjust the tension of PVC film, having poor adaptability, and being unable to adapt to the extensibility characteristics of PVC materials with different formulations.

[0006] To achieve the above objectives, this application provides the following technical solution: a post-cooling device for a calender used in PVC film production, comprising a housing and a calender body. The housing has an inlet and an outlet on opposite sides. A lower telescopic rod and an upper telescopic rod are fixedly connected to the bottom and top of the housing, respectively. A lower U-shaped plate is fixedly connected to one end of the lower telescopic rod, and an upper U-shaped plate is fixedly connected to one end of the upper telescopic rod. Lower rotating tubes are tightly nested within the lower U-shaped plate on opposite sides via bearings, and a lower roller is fixedly connected between the two lower rotating tubes. Similarly, upper rotating tubes are tightly nested within the upper U-shaped plate on opposite sides via bearings, and a lower roller is fixedly connected between the two upper rotating tubes. The calender is equipped with an upper roller. A fixed frame is fixedly connected to the side of the housing. A dual-axis motor is fixedly connected inside the fixed frame. A threaded rod is fixedly connected to the output end of the dual-axis motor. The shaft end of the threaded rod is rotatably connected to the inner side of the fixed frame. A threaded cylinder is threadedly connected to the surface of the threaded rod. Movable plates are fixedly connected to the sides of both the lower and upper U-shaped plates. The movable plates are slidably connected to the fixed frame and fixedly connected to the surface of the threaded cylinder. A fixed rod is fixedly connected to the top of the housing. A tension sensor is fixedly connected to the bottom of the fixed rod. A film is output from inside the calender body. The film is conveyed and connected to the surface of the tension sensor, the lower roller, and the upper roller.

[0007] The above scheme, by setting up a dual-axis motor and a tension sensor, activates the tension sensor when the tension of the membrane needs to be adjusted. Under the action of the tension sensor, the membrane tension value can be monitored. When the tension sensor detects a change in membrane tension, it transmits a signal to an external controller. The external controller then starts the dual-axis motor, causing the threaded rod to rotate. Under the limit of multiple telescopic rods, the threaded cylinder can move on the surface of the threaded rod, thereby adjusting the distance between the upper and lower rollers. By adjusting the distance between the upper and lower rollers, the tension of the PVC membrane can be adjusted. This method has high adaptability and can accommodate the extensibility characteristics of different PVC materials, ensuring the cooling quality of PVC membranes with different formulations.

[0008] Furthermore, L-shaped rods are fixedly connected to both sides of the lower U-shaped plate and the upper U-shaped plate. A horizontal connecting pipe is fixedly connected to one end of the L-shaped rod. Multiple rotary joints are fixedly connected to the surface of the horizontal connecting pipe. One end of the multiple lower rotary pipes and the upper rotary pipes are respectively fixedly connected to the side of the multiple rotary joints. A flexible hose is fixedly connected to one end of the two horizontal connecting pipes.

[0009] The above solution allows the U-shaped plate and the horizontal connecting pipe to be connected by an L-shaped rod. Then, with the help of the rotary joint, fluid communication between the rotary pipe and the horizontal connecting pipe can be achieved, creating a circulation channel for the coolant, controlling the roller temperature, and preventing uneven cooling of the PVC film.

[0010] Furthermore, one end of one of the hoses is fixedly connected to an inlet pipe, and one end of the other hose is fixedly connected to a return pipe.

[0011] The above solution, by setting up inlet and outlet pipes, allows for the separate input and output of liquid media, forming a closed-loop temperature control system that precisely adjusts the roller surface temperature to ensure the quality of PVC film forming.

[0012] Furthermore, a first gear is fixedly connected to the surface of both the lower rotating tube and the upper rotating tube, and a fixed shell is fixedly connected to the side of the lower U-shaped plate. A limit gear is movably connected to the side of the fixed shell via a pin.

[0013] The above scheme enables the roller to rotate actively and drive the film to move by setting the first gear. The fixed shell and the limiting gear prevent the gear chain from derailing and help adjust the tension of the chain.

[0014] Furthermore, a rotary motor is fixedly connected to the inner side of the box, a second gear is fixedly connected to the output end of the rotary motor, an electric push rod is fixedly connected to the bottom of the box, a U-shaped frame is fixedly connected to one end of the electric push rod, and an adjusting gear is movably connected inside the U-shaped frame.

[0015] The above scheme provides a power source for the rotation of the roller by setting up a rotary motor and a second gear, which drives the gear chain transmission system. By setting up an electric push rod, the position of the gear can be moved and adjusted, and the tension of the gear chain can be dynamically adjusted to adapt to different working conditions and prevent the gear chain from slipping.

[0016] Furthermore, the first gear, the second gear, the limiting gear, and the adjusting gear are connected by a gear chain on their surfaces.

[0017] By using the above scheme, a closed-loop transmission system can be formed by setting up a gear chain to connect the first gear, the second gear, the limit gear, and the adjusting gear, which synchronously drives the upper roller and the lower roller to rotate, ensuring that the film moves at a uniform speed.

[0018] Furthermore, a door is movably connected to the front of the enclosure, and an observation window is provided inside the door.

[0019] The above solution, by setting up doors and observation windows, allows operators to monitor the calendering process, handle abnormal situations in a timely manner, and reduce downtime.

[0020] Furthermore, support feet are fixedly connected to the four corners of the bottom of the box.

[0021] The above solution, by setting up support feet, can maintain equipment stability, reduce the impact of vibration on rolling accuracy, and adapt to different ground conditions.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0023] This is a post-cooling device for a calender used in PVC film production. It incorporates a dual-axis motor and a tension sensor. When film tension needs adjustment, the tension sensor is activated to monitor the film tension. Upon detecting a change in film tension, the sensor transmits a signal to an external controller. The external controller then activates the dual-axis motor, causing the threaded rod to rotate. Under the control of multiple telescopic rods, the threaded cylinder moves across the surface of the threaded rod, allowing adjustment of the distance between the upper and lower rollers. This adjustment controls the tension of the PVC film, providing high adaptability to accommodate the elongation characteristics of different PVC formulations and ensuring the cooling quality of PVC films with varying formulations. Attached Figure Description

[0024] Figure 1 This is a frontal three-dimensional structural diagram of this application;

[0025] Figure 2 This is a side-view perspective three-dimensional structural diagram of this application;

[0026] Figure 3 This is a schematic diagram of the lower telescopic rod in this application;

[0027] Figure 4 This is a schematic diagram of the structure of the electric actuator in this application;

[0028] Figure 5 This is a schematic diagram of the structure of the dual-axis motor in this application;

[0029] Figure 6 This is a schematic diagram of the structure of the first gear in this application.

[0030] In the picture:

[0031] 1. Housing; 101. Inlet; 102. Outlet; 103. Lower telescopic rod; 104. Lower U-shaped plate; 105. Upper telescopic rod; 106. Upper U-shaped plate; 107. Lower roller; 108. Upper roller; 109. L-shaped rod; 1010. Horizontal connecting pipe; 1011. Flexible hose; 1012. Liquid inlet pipe; 1013. Return pipe; 1014. Upper rotating pipe; 1015. First gear; 1016. Rotary motor; 1017. Second gear; 1018. Gear 1019. Chain; 1020. Electric push rod; 1021. U-shaped frame; 1022. Adjusting gear; 1023. Fixed rod; 1024. Tension sensor; 1025. Fixed frame; 1026. Door body; 1027. Observation window; 1028. Support foot; 1029. Dual-axis motor; 1030. Threaded rod; 1031. Movable plate; 1032. Threaded cylinder; 1033. Fixed shell; 1034. Limit gear; 1035. Lower rotating tube; 1036. Rotary joint;

[0032] 2. Calender body; 201. Film body. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] Please see Figure 1 , Figure 3 and Figure 5This embodiment describes a downstream cooling device for a PVC film production calender, comprising a housing 1 and a calender body 2. The housing 1 has an inlet 101 and an outlet 102 on opposite sides. A lower telescopic rod 103 and an upper telescopic rod 105 are fixedly connected to the bottom and top of the housing 1, respectively. A lower U-shaped plate 104 is fixedly connected to one end of the lower telescopic rod 103, and an upper U-shaped plate 106 is fixedly connected to one end of the upper telescopic rod 105. Lower rotating tubes 1034 are tightly nested within the lower U-shaped plate 104 on opposite sides via bearings. A lower roller 107 is fixedly connected between the two lower rotating tubes 1034. Inside the U-shaped plate 106, upper rotating tubes 1014 are tightly nested on opposite sides via bearings. Upper rollers 108 are fixedly connected between the two upper rotating tubes 1014. A fixed frame 1024 is fixedly connected to the side of the housing 1. A dual-axis motor 1028 is fixedly connected inside the fixed frame 1024. A threaded rod 1029 is fixedly connected to the output end of the dual-axis motor 1028. The shaft end of the threaded rod 1029 is rotatably connected to the inner side of the fixed frame 1024. A threaded cylinder 1031 is threadedly connected to the surface of the threaded rod 1029. Movable plates 1030 are fixedly connected to the sides of both the lower U-shaped plate 104 and the upper U-shaped plate 106. The movable plate 1030 is slidably connected within the fixed frame 1024 and fixedly connected to the surface of the threaded cylinder 1031. A fixed rod 1022 is fixedly connected to the top of the inside of the housing 1, and a tension sensor 1023 is fixedly connected to the bottom of the fixed rod 1022. A film 201 is output from inside the calender body 2. The film 201 is conveyed and connected to the surface of the tension sensor 1023, the lower roller 107, and the upper roller 108. By setting a dual-axis motor 1028 and the tension sensor 1023, the tension value of the film 201 can be monitored. When the tension sensor 1023 detects a change in film tension, the tension sensor 1023... 023 transmits a signal to an external controller, which then starts the dual-axis motor 1028 to rotate the threaded rod 1029. Under the limit of multiple telescopic rods, the threaded cylinder 1031 can move on the surface of the threaded rod 1029, thereby adjusting the distance between the upper roller 108 and the lower roller 107. By adjusting the distance between the upper roller 108 and the lower roller 107, the tension of the PVC film can be adjusted. It has high adaptability and can adapt to the extensibility characteristics of different PVC materials, ensuring the cooling quality of PVC films with different formulations.

[0035] Please see Figure 3 , Figure 4 and Figure 6Both sides of the lower U-shaped plate 104 and the upper U-shaped plate 106 are fixedly connected to L-shaped rods 109. One end of the L-shaped rod 109 is fixedly connected to a horizontal connecting pipe 1010. Multiple rotary joints 1035 are fixedly connected to the surface of the horizontal connecting pipe 1010. One end of multiple lower rotary pipes 1034 and upper rotary pipes 1014 is fixedly connected to the side of multiple rotary joints 1035. One end of each of the two horizontal connecting pipes 1010 is fixedly connected to a flexible hose 1011. The U-shaped plate and the horizontal connecting pipe 1010 can be connected through the L-shaped rod 109, and then the rotary joints... Under the action of head 1035, fluid communication can be achieved between the rotating tube and the horizontal connecting tube 1010, a circulation channel for coolant can be constructed, the roller temperature can be controlled, and uneven cooling of PVC film can be prevented. One end of a hose 1011 is fixedly connected to the liquid inlet pipe 1012, and the other end of the hose 1011 is fixedly connected to the return pipe 1013. By setting the liquid inlet pipe 1012 and the return pipe 1013, liquid medium can be input and output respectively, forming a closed-loop temperature control system, accurately adjusting the roller surface temperature, and ensuring the forming quality of PVC film.

[0036] Please see Figure 4 and Figure 6 A first gear 1015 is fixedly connected to the surfaces of both the lower rotating tube 1034 and the upper rotating tube 1014. A fixed shell 1032 is fixedly connected to the side of the lower U-shaped plate 104. A limit gear 1033 is movably connected to the side of the fixed shell 1032 via a pin. By setting the first gear 1015, the roller can be actively rotated, driving the membrane 201 to move. By setting the fixed shell 1032 and the limit gear 1033, the gear chain 1018 can be prevented from derailing, and the tension of the chain can be adjusted. A rotary motor 1016 is fixedly connected to the side of the inside of the housing 1. A second gear 1017 is fixedly connected to the output end of the rotary motor 1016. An electric push rod 1019 is fixedly connected to the bottom of the inside of the housing 1. A U-shaped frame 1020 is fixedly connected to one end of the electric push rod 1019. An adjustment mechanism is movably connected inside the U-shaped frame 1020. The gear 1021, through the setting of the rotary motor 1016 and the second gear 1017, can provide a power source for the rotation of the roller, driving the gear chain 1018 transmission system. Through the setting of the electric push rod 1019, the position of the gear 1021 can be moved and adjusted, and the tension of the gear chain 1018 can be dynamically adjusted to adapt to different working conditions and prevent the gear chain 1018 from slipping. The gear chain 1018 is connected to the surface of the first gear 1015, the second gear 1017, the limit gear 1033 and the adjustment gear 1021. By setting the gear chain 1018 to connect the first gear 1015, the second gear 1017, the limit gear 1033 and the adjustment gear 1021, a closed-loop transmission system can be formed, synchronously driving the upper roller 108 and the lower roller 107 to rotate, ensuring that the film 201 moves at a uniform speed.

[0037] Please see Figure 1The front of the box 1 is movably connected to a door 1025, and an observation window 1026 is set inside the door 1025. By setting the door 1025 and the observation window 1026, it is convenient for operators to monitor the calendering process, handle abnormal situations in a timely manner, and reduce downtime. The bottom of the box 1 is fixedly connected to four corners with support feet 1027. By setting the support feet 1027, the stability of the equipment can be maintained, the impact of vibration on calendering accuracy can be reduced, and it can adapt to different ground conditions.

[0038] In this embodiment, by setting up a dual-axis motor 1028 and a tension sensor 1023, when it is necessary to adjust the tension of the membrane 201, the tension sensor 1023 is activated. Under the action of the tension sensor 1023, the tension value of the membrane 201 can be monitored. When the tension sensor 1023 detects a change in membrane tension, it transmits a signal to an external controller. Then, the external controller starts the dual-axis motor 1028 to run, causing the threaded rod 1029 to rotate. Under the limit of multiple telescopic rods, the threaded cylinder 1031 can be driven to move on the surface of the threaded rod 1029, thereby adjusting the upper roller 108 and the lower roller. The distance between rollers 107 and 108 can be adjusted to regulate the tension of the PVC film. This provides high adaptability, accommodating the elongation characteristics of different PVC materials and ensuring the cooling quality of PVC films with varying formulations. A liquid inlet pipe 1012 allows coolant to be injected into the rollers 108 and 107, while a return pipe 1013 recovers the heated coolant. The PVC film cools slowly under the cooling device, achieving good cooling without compromising its performance and improving cooling quality.

[0039] The working principle of the above embodiment is as follows: During use, the film 201 is conveyed out from the calender body 2 and enters the box 1 through the inlet 101. When the film 201 passes through the upper roller 108 and the lower roller 107, the film 201 can be cooled by the cooling liquid in the upper roller 108 and the lower roller 107. The cooled film 201 flows out from the outlet 102 and is wound up by the external winding equipment.

[0040] When the tension of the membrane 201 needs to be adjusted, the tension sensor 1023 is activated. Under the action of the tension sensor 1023, the tension value of the membrane 201 can be monitored. When the tension sensor 1023 detects a change in membrane tension, the dual-axis motor 1028 runs, adjusting the distance between the upper roller 108 and the lower roller 107, thereby regulating the tension of the PVC film and ensuring the quality of PVC film cooling. By setting a rotary motor 1016, the operation of the rotary motor 1016 can drive the second gear... 1017 rotates, and through the transmission of gear chain 1018, it can drive the first gear 1015 to rotate, which can synchronously drive the upper roller 108 and the lower roller 107 to rotate, ensuring that the film body 201 moves at a constant speed. By setting an electric push rod 1019, when adjusting the distance between the upper roller 108 and the lower roller 107, the electric push rod 1019 runs, which can push the adjusting gear 1021 to move. By moving the position of the adjusting gear 1021, the chain tension can be dynamically adjusted, which can prevent the gear chain 1018 from slipping.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0042] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cooling device for the back end of a calender for PVC film production, comprising a housing (1) and a calender body (2), characterized in that: The box body (1) has an inlet (101) and an outlet (102) on opposite sides. The bottom and top of the box body (1) are fixedly connected to a lower telescopic rod (103) and an upper telescopic rod (105), respectively. One end of the lower telescopic rod (103) is fixedly connected to a lower U-shaped plate (104), and one end of the upper telescopic rod (105) is fixedly connected to an upper U-shaped plate (106). The lower U-shaped plate (104) has lower rotating tubes (1034) tightly nested on opposite sides through bearings on both sides. A lower roller (107) is fixedly connected between the two lower rotating tubes (1034). The upper U-shaped plate (106) has upper rotating tubes (1014) tightly nested on opposite sides through bearings on both sides. An upper roller (108) is fixedly connected between the two upper rotating tubes (1014). A fixed frame (1024) is fixedly connected to the side of the box body (1). A double shaft is fixedly connected inside the fixed frame (1024). The motor (1028) has a threaded rod (1029) fixedly connected to its output end. The shaft end of the threaded rod (1029) is rotatably connected to the inner side of the fixed frame (1024). The threaded rod (1029) is threadedly connected to a threaded cylinder (1031). The lower U-shaped plate (104) and the upper U-shaped plate (106) are both fixedly connected to movable plates (1030). The movable plates (1030) are slidably connected inside the fixed frame (1024) and fixedly connected to the surface of the threaded cylinder (1031). The top of the box (1) is fixedly connected to a fixed rod (1022). The bottom of the fixed rod (1022) is fixedly connected to a tension sensor (1023). The calender body (2) outputs a film (201). The film (201) is conveyed and connected to the surface of the tension sensor (1023), the lower roller (107), and the upper roller (108).

2. The downstream cooling device of a calender for PVC film production according to claim 1, characterized in that: The lower U-shaped plate (104) and the upper U-shaped plate (106) are fixedly connected to L-shaped rods (109) on opposite sides. One end of the L-shaped rod (109) is fixedly connected to a horizontal connecting pipe (1010). Multiple rotating joints (1035) are fixedly connected to the surface of the horizontal connecting pipe (1010). One end of the multiple lower rotating pipes (1034) and the upper rotating pipe (1014) is fixedly connected to the side of the multiple rotating joints (1035). One end of the two horizontal connecting pipes (1010) is fixedly connected to a flexible hose (1011).

3. The downstream cooling device of a calender for PVC film production according to claim 2, characterized in that: One of the hoses (1011) is fixedly connected to an inlet pipe (1012) at one end, and the other hose (1011) is fixedly connected to a return pipe (1013) at one end.

4. The downstream cooling device of a calender for PVC film production according to claim 1, characterized in that: The lower rotating tube (1034) and the upper rotating tube (1014) are both fixedly connected to the surface of the first gear (1015), and the side of the lower U-shaped plate (104) is fixedly connected to the fixed shell (1032). The side of the fixed shell (1032) is movably connected to the limit gear (1033) through the pin shaft.

5. The downstream cooling device of a calender for PVC film production according to claim 4, characterized in that: A rotary motor (1016) is fixedly connected to the inner side of the housing (1). A second gear (1017) is fixedly connected to the output end of the rotary motor (1016). An electric push rod (1019) is fixedly connected to the bottom of the housing (1). A U-shaped frame (1020) is fixedly connected to one end of the electric push rod (1019). An adjusting gear (1021) is movably connected inside the U-shaped frame (1020).

6. The downstream cooling device of a calender for PVC film production according to claim 5, characterized in that: The first gear (1015), the second gear (1017), the limiting gear (1033) and the adjusting gear (1021) are connected by a gear chain (1018) on their surfaces.

7. The downstream cooling device of a calender for PVC film production according to claim 1, characterized in that: The front of the box (1) is movably connected to a door (1025), and an observation window (1026) is provided inside the door (1025).

8. The downstream cooling device of a calender for PVC film production according to claim 1, characterized in that: The box (1) is fixedly connected to four support feet (1027) at the bottom corners.

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