Novel longitudinal stretching preheating device

Abstract

The utility model discloses a novel longitudinal stretching preheating device, and belongs to the field of film two-way stretching. The novel longitudinal stretching preheating device comprises a heating frame and a hot air circulating system, a roller in the heating frame is of a hollow structure, the preheating mode is gas preheating, and a clean and sealed preheating environment with the uniform temperature is provided for a film through a heat preservation plate, a heater and other devices. The inertia of the roller is reduced on the premise that the rigidity requirement is met, so that the rotation flexibility is improved, the gas in the heat preservation plate is circulating gas, and the gas after preheating the film still returns to the fan and the heater to be continuously heated. According to the device disclosed by the utility model, the preheating efficiency is improved, the energy consumption is saved, and the entering of impurities is also reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of film bidirectional stretching, and specifically relates to a novel longitudinal stretching preheating device. BACKGROUND

[0002] The film bidirectional stretching machine includes longitudinal stretching and transverse stretching devices, wherein the longitudinal stretching (MDO) is to heat a thick sheet from a casting machine to a high elastic state in a longitudinal stretching unit for a certain multiple of longitudinal stretching. The heating mode of the longitudinal stretching machine is mainly realized through roller heating and infrared auxiliary heating, generally including preheating rollers, stretching rollers, cooling rollers, tension rollers, rubber pressure rollers, infrared heating pipes, heating units, and driving devices. The longitudinal stretching is usually single-point stretching, and there is also multi-point stretching, such as two-point or three-point stretching. The longitudinal stretching ratio is generated by the speed difference between the slow stretching roller and the fast stretching roller, and the stretching ratio is generally 1-7 times.

[0003] For example, patent CN216182740U discloses a stretching roller for film longitudinal stretching, the outer roller is a hollow structure and has openings at both ends; the first plug is matched with the opening at one end of the outer roller and is fixed with the outer roller; the second plug is located inside the outer roller and is fixed with the outer roller; the shaft is matched with the first through hole on the first plug and is fixed with the first plug; the fixed shaft is matched with the second plug, and the fixed shaft is provided with a third through hole; the inner cylinder is a hollow structure and has an opening at one end, and the end with the opening is fixed with the second plug; one end of the connecting part is fixed with the closed end of the inner cylinder, and the other end of the connecting part is fixed with the first plug; the hot oil is located in the inner cylinder; one end of the heating part passes through the third through hole on the fixed shaft and extends into the inner cylinder, and the other end of the heating part is sealingly matched with the third through hole.

[0004] CN206528069U discloses a heating device of a longitudinal stretching unit, comprising: a water supplement tank (1), a first heater (2), a water pump (3), a heat exchanger (4), and a second heater (5), the water supplement tank (1), the first heater (2), the water pump (3), the second heater (5), and the heat exchanger (4) are sequentially and water-communicatively connected in series, the water channel of the second heater (5) is communicated with the water channel of the heat exchanger (4) through the water channel of a flow roller (6), and the first heater (2) and the second heater (5) are respectively electrically connected with a power supply through a first relay and a second relay.

[0005] At present, most longitudinal stretching devices heat the film by heating the medium inside the roller to transfer heat to the surface of the film, and the heating medium is generally heat-conducting oil, water, or steam. This heating method needs to go through multiple preheating conversions, the structure of the equipment is complex, the preheating efficiency is low, the equipment cost is high, and the equipment is difficult to maintain and repair in the later period.

[0006] In summary, in the longitudinal stretching process of the film, the structure of the roller preheating device of the film is complex, resulting in low preheating efficiency, high equipment cost, and difficult use and maintenance, which are problems to be solved urgently. Practical new content

[0007] In view of the above problems, the utility model provides a novel longitudinal stretching preheating device, through the combination of motor and heater to directly preheat the film, the efficiency of preheating is high, and operating cost is low, the hot air provided by the heater can be recycled, improve the device performance while energy saving and environmental protection.

[0008] The utility model provides a novel longitudinal stretching preheating device, novel longitudinal stretching preheating device includes heating frame and hot air circulation system, wherein, heating frame includes frame, upper roller group and lower roller group, upper roller group and lower roller group set up on frame, and the roller of upper roller group and lower roller group is installed with bearing with seat on the left and right sides respectively;

[0009] Heating frame is provided with hot air circulation system outside, and the hot air circulation system includes heat preservation plate, temperature sensor, external fan and heater, and a circulating gas port is formed in the bottom of the heat preservation plate;The heat preservation plate surrounds the upper roller group and the lower roller group, and the temperature sensor is arranged above the heat preservation plate;

[0010] The transmission shaft of one side of the roller in the upper roller group and the lower roller group protrudes from the heat preservation plate and is used for connecting a transmission motor;

[0011] The circulating gas port includes a circulating gas inlet and a circulating gas outlet, the circulating gas inlet is connected with the heater through a circulating pipeline, and the circulating gas outlet is connected with the fan through a circulating pipeline.

[0012] Further, the frame includes a machine body and support legs, the machine body is a rectangular frame structure, including four peripheral side walls, the support legs are 8, evenly distributed on the machine body, and used for fixing and supporting the machine body.

[0013] Further, the bearing with seat is fixed on the side wall of the machine body by bolts, wherein the bearing with seat of the upper roller group is installed on the upper edge of the side wall of the machine body by the positive direction of the bolt, and the bearing with seat of the lower roller group is installed on the lower edge of the side wall of the machine body by the negative direction of the bolt.

[0014] Further, the rollers in the upper roller group and the lower roller group are all hollow structures.

[0015] Further, the hollow structure improves the flexibility of the roller.

[0016] Further, the film passes through the upper roller group and the lower roller group alternately.

[0017] Further, the distance between the rollers in the upper roller group is 85-90 cm, and the distance between the rollers in the lower roller group is 85-90 cm.

[0018] Further, the number of rollers in the upper roller group is 13-15, and the number of rollers in the lower roller group is 13-15.

[0019] Further, a sealing ring is installed at the intersection of the transmission shaft and the heat preservation plate, so that the heat preservation plate and the inside form a relatively sealed box structure.

[0020] Further, each roller in the upper roller group and the lower roller group is equipped with a transmission motor.

[0021] Further, the transmission motor provides power for the rollers in the upper roller group and the lower roller group.

[0022] Further, the heat preservation plate is fixed on the machine body and is supported together through the support legs. The heat preservation plate is provided with an open structure with a rectangular profile shape at the film inlet and outlet, which is suitable for the width of the film.

[0023] Further, a visual observation port is also provided on the heat preservation plate, which is used to present the state of the film inside the heat preservation plate.

[0024] Further, the number of temperature sensors is 3, which are respectively arranged at the circulating gas inlet, circulating gas outlet and middle position at the top of the heat preservation plate, for monitoring the working temperature inside the heat preservation plate.

[0025] Further, the fan and the heater are connected through a gas pipeline.

[0026] Further, the circulating gas inlet is arranged at the film inlet side of the new longitudinal stretching preheating device, and the circulating gas outlet is arranged at the film outlet side of the new longitudinal stretching preheating device.

[0027] Further, the fan works to deliver gas to the heater through the gas pipeline. The heated gas enters the heat preservation plate through the circulating gas inlet at the bottom of the heat preservation plate, preheats the film, and the preheated circulating gas returns to the fan through the circulating gas outlet for repeated use.

[0028] Further, the new longitudinal stretching preheating device further comprises an intelligent control system, the temperature inside the heat preservation plate is monitored by the temperature sensor, the intelligent control system is further connected with the heater through a signal line, and the heating temperature of the heater is adjusted according to the monitored temperature of the temperature sensor.

[0029] The new longitudinal stretching preheating device has the advantages that:

[0030] 1. The new longitudinal stretching preheating device breaks the traditional heating oil roller preheating mode for the film, the traditional oil roller preheating mode has low preheating efficiency, and the device and structure used by the oil roller are complex and difficult to maintain.

[0031] 2. The roller in the new longitudinal stretching preheating device is a hollow structure, which reduces the inertia of the roller under the premise of meeting the rigidity requirement, reduces the load of the driving motor, is beneficial to improving the response speed, operation stability and flexibility of the whole device, and the intelligent control system is further arranged, the preheating temperature of the new longitudinal stretching preheating device is adjusted through control and monitoring of the heater and the temperature sensor. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 Fig. 3 is a top view of the new longitudinal stretching preheating device in the new longitudinal stretching preheating device;

[0033] Figure 2 Fig. 4 is an internal cross-sectional view of the new longitudinal stretching preheating device in the new longitudinal stretching preheating device;

[0034] Figure 3 Fig. 5 is a visual observation port view of the new longitudinal stretching preheating device in the new longitudinal stretching preheating device;

[0035] Figure 4 Fig. 6 is a sectional view of the new longitudinal stretching preheating device in the new longitudinal stretching preheating device;

[0036] In the drawing, the names of various signs are as follows: 1, upper roller group; 2, lower roller group; 3, bearing with seat; 4, heat preservation plate; 5, temperature sensor; 6, fan; 7, heater; 8, intelligent control system; 9, rack; 401, circulating gas inlet; 402, circulating gas outlet. DETAILED DESCRIPTION

[0037] The utility model makes a detailed description of the utility model in connection with the following examples:

[0038] The utility model provides a novel longitudinal stretch preheating device, preheat the film through the gaseous circulation heating, greatly save the energy consumption, also simplify the structure of device.

[0039] Example 1

[0040] The utility model provides a novel longitudinal stretch preheating device, the novel longitudinal stretch preheating device includes heating frame and hot air circulation system, wherein, the heating frame includes rack 9, upper roller group 1 and lower roller group 2, the upper roller group 1 and the lower roller group 2 are arranged on the rack 9, and the roller cylinders in the upper roller group 1 and the lower roller group 2 are respectively provided with seat bearings 3 on the left and right sides thereof;

[0041] The heating frame is provided with the hot air circulation system outside, the hot air circulation system includes heat preservation plate 4, temperature sensor 5, external fan 6 and heater 7, the bottom of the heat preservation plate 4 is provided with a circulating gas port;The heat preservation plate 4 surrounds the upper roller group 1 and the lower roller group 2, and the temperature sensor 5 is arranged above the heat preservation plate 4;

[0042] One side of the roller cylinder in the upper roller group 1 and the lower roller group 2 protrudes from the heat preservation plate 4, and is used for connecting a transmission motor;

[0043] The circulating gas port includes a circulating gas inlet 401 and a circulating gas outlet 402, the circulating gas inlet 401 is connected with the heater 7 through a circulating pipeline, and the circulating gas outlet 402 is connected with the fan 6 through a circulating pipeline.

[0044] In the embodiment, the rack 9 includes a machine body and support legs, the machine body is a rectangular frame structure, includes four peripheral side walls, the support legs are eight, are evenly distributed on the machine body, and are used for fixing and supporting the machine body;

[0045] The seat bearing 3 is fixed on the machine body side wall by bolts, wherein the seat bearing 3 of the upper roller group 1 is installed on the upper edge of the machine body side wall by the positive direction of the bolt, and the seat bearing 3 of the lower roller group 2 is installed on the lower edge of the machine body side wall by the negative direction of the bolt, and the opposite installation mode makes the force received by the roller cylinder in the working process transmitted to the machine body side wall, when the roller cylinder bears the pressure in the vertical direction from the material or the processing process in the running process, the seat bearings 3 can transmit force upward and downward respectively, so that the machine body side wall can bear force uniformly, and deformation or structural damage of the machine body due to unilateral excessive stress is avoided;

[0046] The roller in the upper roller group 1 and the lower roller group 2 is a hollow structure, which improves the flexibility of the roller, wherein the hollow structure greatly reduces the mass compared with the solid structure, and in the device which needs to move or adjust the position of the roller frequently, the lighter roller can reduce the inertia of the device, when the device needs to start, stop or change speed, the inertia force required to be overcome by the transmission motor driving the roller is reduced, so as to quickly respond to the operation instruction, improve the operation efficiency of the device, in addition, the hollow structure of the roller has better flexibility to adapt to deformation, because the inside of the roller is a hollow structure, the roller can produce a small elastic deformation when subjected to local pressure, thereby avoiding damage caused by excessive local stress, the hollow structure can also realize heat circulation inside, so that the surface of the roller is heated more uniformly;

[0047] The film passes between the upper roller group 1 and the lower roller group 2 in turn and alternately;

[0048] The radial distance between the rollers in the upper roller group 1 is 86 cm, and the radial distance between the rollers in the lower roller group 2 is 86 cm;

[0049] The number of rollers in the upper roller group 1 is 13, and the number of rollers in the lower roller group 2 is 13;

[0050] The transmission shaft and the heat preservation plate 4 intersect and are provided with a sealing ring, so that the heat preservation plate 4 and the inside form a relatively sealed box structure, the sealing ring is tightly fitted with the gap between the transmission shaft and the heat preservation plate 4, the heat is concentrated in the heat preservation plate 4, and the sealed box structure can reduce the temperature fluctuation caused by the uneven material performance in the preheating process, reduce energy loss, and improve energy utilization efficiency;

[0051] The transmission motor is provided on each roller in the upper roller group 1 and the lower roller group 2, and provides power for the rollers in the upper roller group 1 and the lower roller group 2;

[0052] The heat preservation plate 4 is fixed on the machine body and is supported by the support legs. Rectangular openings are respectively formed at the film inlet and outlet of the heat preservation plate 4, which are adapted to the width of the film. The heat preservation plate 4 and the machine body are supported by the support legs, forming a stable structure. The machine body is the main part of the device and is combined with the heat preservation plate 4. The weight is evenly distributed on the support plane when the rollers in the device rotate. The stable support structure can prevent the device from shaking and falling, ensuring the safe and stable operation of the equipment. The rectangular openings on the heat preservation plate 4 can maintain the stability of the film transmission direction and prevent the film from deviating during transmission. At the same time, although the heat preservation plate 4 is provided with rectangular openings, the size of the openings is adapted to the width of the film, which can reduce heat loss through the openings as much as possible while ensuring normal film transmission.

[0053] The heat preservation plate 4 is also provided with a visual observation port for presenting the state of the film inside the heat preservation plate 4. In the film stretching process, the operator can timely find that the film is locally stretched too much or has a small tear through the visual observation port, so as to timely adjust the process parameters to ensure the consistency of the film quality. It can also help to find whether there are abnormal conditions such as loose, falling, foreign matter, etc. in the device.

[0054] The number of temperature sensors 5 is three, which are respectively arranged at the circulating gas inlet 401, the circulating gas outlet 402 and the middle position of the top of the heat preservation plate 4. They are used to monitor the working temperature in the heat preservation plate 4. Through the temperature difference between the circulating gas inlet 401 and the circulating gas outlet 402, the ability of the circulating gas to take away or release heat in the heat preservation plate 4 can be evaluated. The temperature sensor 5 at the middle position is used to judge whether the temperature inside the heat preservation plate 4 is uniform. By monitoring the temperature of the three positions in real time, the device can dynamically adapt to different working conditions and process requirements.

[0055] The fan 6 and the heater 7 are connected by a gas pipeline;

[0056] The circulating gas inlet 401 is arranged at the film inlet side of the new longitudinal stretching preheating device, and the circulating gas outlet 402 is arranged at the film outlet side of the new longitudinal stretching preheating device.

[0057] The fan 6 works to deliver gas through the gas pipeline into the heater 7, and the gas heated by the heater 7 enters the heat preservation plate 4 through the circulating gas inlet 401 at the bottom of the heat preservation plate 4, preheats the film, and the preheated circulating gas returns to the fan 6 through the circulating gas outlet 402 for reuse. Due to the upward flow characteristic of hot gas, the hot gas gradually flows upward after entering the bottom of the heat preservation plate 4, can fully contact each part of the film, so that the film can uniformly absorb heat on the whole plane, and the gas is circulated in the fan 6, the heater 7 and the system, and in a stable working state, the working load of the fan 6 and the heater 7 is relatively stable, and the energy demand will not fluctuate greatly due to frequent replacement of a large amount of fresh gas.

[0058] The novel longitudinal stretching preheating device further comprises an intelligent control system 8, the intelligent control system 8 monitors the temperature inside the heat preservation plate 4 through the temperature sensor 5, and the intelligent control system 8 is further connected with the heater 7 through a signal line and adjusts the heating temperature of the heater 7 according to the monitored temperature of the temperature sensor 5. Different film materials and stretching processes have strict requirements on the preheating temperature, and through the accurate adjustment of the intelligent control system 8, the decline of film performance caused by excessively high temperature or the influence of stretching effect caused by excessively low temperature can be avoided, so that the quality and production efficiency of the film are ensured. Meanwhile, the intelligent control system 8 can obtain multiple temperature data points through the temperature sensor 5, so as to more accurately master the temperature distribution inside the heat preservation plate 4, and the intelligent control system 8 can finely adjust the heater 7 according to the detailed temperature information.

[0059] According to the above, the novel longitudinal stretching preheating device has a wide range of applications, low cost and high market prospect.

[0060] The above is only a preferred embodiment of the present application, and does not limit the present application in any other form, and any modification or equivalent change made according to the technical essence of the present application still belongs to the scope of the present application.

Claims

1. A novel longitudinal stretching preheating device, characterized by, The novel longitudinal stretching preheating device comprises a heating frame and a hot air circulation system, wherein the heating frame comprises a rack (9), an upper roller set (1) and a lower roller set (2), the upper roller set (1) and the lower roller set (2) are arranged on the rack (9), and seat bearings (3) are respectively arranged on the left and right sides of the rollers in the upper roller set (1) and the lower roller set (2); The heating frame is externally provided with the hot air circulation system, the hot air circulation system comprises a heat preservation plate (4), a temperature sensor (5), an external fan (6) and a heater (7), and a circulating gas port is formed in the bottom of the heat preservation plate (4); the heat preservation plate (4) surrounds the upper roller set (1) and the lower roller set (2), and the temperature sensor (5) is arranged above the heat preservation plate (4); One side of the transmission shaft of the roller in the upper roller set (1) and the lower roller set (2) protrudes from the heat preservation plate (4) and is used for connecting a transmission motor; The circulating gas port comprises a circulating gas inlet (401) and a circulating gas outlet (402), the circulating gas inlet (401) is connected with the heater (7) through a circulating pipeline, and the circulating gas outlet (402) is connected with the fan (6) through a circulating pipeline.

2. The novel longitudinal stretch preheating device according to claim 1, characterized in that, The rack (9) comprises a machine body and supporting legs, the machine body is a rectangular frame structure and comprises four side walls, and the supporting legs are evenly distributed on the machine body and are used for fixing and supporting the machine body.

3. The novel longitudinal preheating device for stretching according to claim 2, characterized in that, The seat bearings (3) are fixed on the side walls of the machine body by bolts, the seat bearings (3) of the upper roller set (1) are arranged on the upper edges of the side walls of the machine body by the positive direction of the bolts, and the seat bearings (3) of the lower roller set (2) are arranged on the lower edges of the side walls of the machine body by the reverse direction of the bolts.

4. The novel longitudinal preheating device for stretching according to claim 1, characterized in that, The rollers in the upper roller set (1) and the lower roller set (2) are all hollow structures.

5. The novel longitudinal preheating device for stretching according to claim 1, characterized in that, Sealing rings are arranged at the intersections of the transmission shafts and the heat preservation plate (4), so that the heat preservation plate (4) and the inside form a relatively sealed box structure.

6. The novel longitudinal preheating device for stretching according to claim 2, characterized in that, The heat preservation plate (4) is fixed on the machine body and is supported by the supporting legs, rectangular openings are respectively formed in the film inlet and the film outlet of the heat preservation plate (4), and the openings are adapted to the width of the film.

7. The novel longitudinal preheating device for stretching according to claim 1, characterized in that, A visual observation port is further arranged on the heat preservation plate (4) and is used for presenting the state of the film inside the heat preservation plate (4).

8. The novel longitudinal preheating device for stretching according to claim 1, characterized in that, The number of the temperature sensors (5) is three, and the temperature sensors (5) are arranged at the circulating gas inlet (401), the circulating gas outlet (402) and the middle position of the top of the heat preservation plate (4) and are used for monitoring the working temperature in the heat preservation plate (4).

9. The novel longitudinal preheating device for stretching according to claim 1, characterized in that, The fan (6) works to convey gas to the heater (7) through a gas pipeline, the gas heated by the heater (7) enters the heat preservation plate (4) through the circulating gas inlet (401) in the bottom of the heat preservation plate (4), preheats the film, and the preheated circulating gas returns to the fan (6) through the circulating gas outlet (402) for repeated use.

10. The novel longitudinal preheating device for stretching according to claim 1, characterized in that, The new longitudinal stretching preheating device further comprises an intelligent control system (8), the intelligent control system (8) monitors the temperature inside the heat preservation plate (4) through the temperature sensor (5), and the intelligent control system (8) is further connected with the heater (7) through a signal line and controls the heating temperature of the heater (7) according to the monitored temperature of the temperature sensor (5).

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