A low tension preheating oven for PE film substrate flattening

Abstract

The present invention relates to a low tension preheating oven for leveling PE film substrates, which comprises a box body, wherein two opposite vertical side walls of the box body are respectively provided with a feed port and a discharge port, and a vertical side wall of the box body perpendicular to the feed port is provided with a circulating air supply assembly, and the circulating air supply assembly is used to circulate hot air into the box body; a guide roller assembly is provided in the box body, and the guide roller assembly comprises an upper guide roller group and a lower guide roller group, and the upper guide roller group and the lower guide roller group are both composed of a plurality of guide rollers that are parallel to each other and evenly spaced, and the guide roller comprises a roller shaft and a roller body sleeved on the roller shaft, and the two ends of the roller shaft are connected with bearings with seats, and the bearings with seats are connected to the outer wall of the box body, and the two ends of the roller body are connected with bearings, and the roller body is connected to the roller shaft through the bearings, and the roller shaft is sleeved with two retaining rings; and a synchronous drive assembly is provided outside the box body. The present invention has the effect of being able to perform low tension leveling on PE film substrates and reducing the possibility of damage to the PE film substrates.

Description

Technical Field

[0001] The invention relates to the technical field of preheating ovens, in particular to a low-tension preheating oven used for leveling PE film substrates. Background Art

[0002] PE film is a commonly used lithium battery separator substrate. Due to its material properties, the film often has wrinkles. On the lithium battery separator coating production line, the wrinkled film substrate needs to be flattened after unwinding in order to carry out subsequent coating and other processes.

[0003] In the prior art, when flattening a PE film substrate, the substrate is usually passed through a preheating oven, in which a guide roller is provided. The substrate passes through the surface of the guide roller in the preheating oven and is heated and stretched, thereby flattening the substrate.

[0004] Since the thickness of the PE film substrate is very small, it is often damaged due to excessive tension when passing through the guide roller of a traditional preheating oven, which not only causes waste but also increases production costs. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a low-tension preheating oven for leveling PE film substrates, which has the effect of being able to perform low-tension leveling on PE film substrates and reduce the possibility of damage to the PE film substrates.

[0006] The above technical effects of the present invention are achieved through the following technical solutions:

[0007] A low-tension preheating oven for leveling PE film substrates comprises a box body, wherein two opposite vertical side walls of the box body are respectively provided with a feed inlet and a discharge inlet, and the feed inlet and the discharge inlet are arranged opposite to each other, and the characteristic is that: a circulating air supply component is arranged on a vertical side wall of the box body perpendicular to the feed inlet, and the circulating air supply component is used to circulate hot air into the box body; a guide roller component is arranged in the box body, and the guide roller component comprises an upper guide roller group and a lower guide roller group, and the upper guide roller group and the lower guide roller group are both composed of a plurality of guide rollers that are parallel to each other and evenly spaced, and the axial direction of the guide roller is parallel to the plane where the feed inlet is located, the upper guide roller group and the lower guide roller group are arranged parallel to each other, and the plurality of guide rollers of the upper guide roller group and the plurality of guide rollers of the lower guide roller group are staggered with each other, and the height of the lowest point of the lower guide roller group is located between the top edge and the bottom edge of the feed inlet; the guide roller comprises a roller shaft and a roller sleeved on the roller shaft The present invention relates to a roller body, wherein two ends of the roller shaft are connected with seat bearings, and the seat bearings are connected to the outer wall of the box body, and two ends of the roller body are connected with bearings, and the roller body is connected to the roller shaft through the bearings, and two retaining rings are sleeved on the roller shaft, and the two retaining rings are respectively located at the two ends of the length direction of the roller body, and the retaining ring includes two half rings and is spliced ​​by two half rings, and the two half rings are connected by screw locking to ensure the relative stillness of the retaining ring and the roller shaft, and the retaining ring is provided with a plurality of threaded holes along its own axial direction, and the inner threads of the threaded holes are connected with locking screws, and one end of the locking screw passes through the threaded holes and is tightly pressed against the end face of the roller body; a synchronous drive assembly is provided outside the box body, and the synchronous drive assembly is used to drive the guide rollers of all upper guide roller groups and the guide rollers of the lower guide roller group to rotate synchronously, and the rotation direction of the guide rollers of the upper guide roller group is opposite to the rotation direction of the guide rollers of the lower guide roller group.

[0008] By adopting the above technical solution, when in use, the PE film substrate is fed into the feed port, and the substrate is alternately passed around the guide rollers of the lower guide roller group and the upper guide roller group, the synchronous drive component is started, and the synchronous drive component drives the guide roller to rotate, so that the upper guide roller group and the lower guide roller group work together to realize the transportation of the substrate, and the substrate will move to the discharge port and finally be discharged from the box body from the discharge port; because the retaining ring and the roller shaft remain relatively stationary, and the locking screw on the retaining ring is pressed against the end face of the roller body, the roller body, the retaining ring and the roller shaft can be protected to be relatively stationary, that is, the roller body can follow the roller shaft synchronously The guide rollers rotate in sync to form an active roller structure, thereby achieving low-tension operation of the substrate. In addition, the staff can tighten or loosen the locking screws according to actual needs to change the degree of synchronous rotation of the roller body and the roller shaft to ensure that the substrate can always maintain low-tension operation; while the guide rollers are conveying the substrate, the circulating air supply assembly can circulate hot air into the box. The substrate becomes smooth due to the combined effect of hot air heating and low tension on the surface of the roller, thereby achieving low-tension leveling of the PE film substrate and reducing the possibility of damage to the PE film substrate.

[0009] In a preferred example, the present invention can be further configured as follows: the circulating air supply component includes an internal return air duct arranged in the box body, an external return air duct arranged outside the box body, a circulating fan connected to the external return air duct, an air supply duct one connected to the circulating fan, an electric heater connected to the air supply duct one, an air supply duct two connected to the electric heater, an air supply duct three connected to the air supply duct two, and an air collecting chamber connected to the air supply duct three, the external return air duct is connected to the internal return air duct, and the external return air duct is also connected to an exhaust fan and a fresh air filter box, the air collecting chamber is located in the box body and below the lower guide roller group, and a plurality of blowing holes are provided on the top surface of the air collecting chamber.

[0010] By adopting the above technical scheme, when in use, the external air passes through the fresh air filter box into the external return air duct, and then passes through the circulation fan, air supply duct one, electric heater, air supply duct two, air supply duct three in sequence and enters the air collecting chamber, and the hot air in the air collecting chamber is blown toward the substrate through the blowing holes above it, and the substrate is heated by the hot air and low tension on the surface of the roller body, so low-tension leveling can be achieved; after the hot air blows through the substrate, it enters the external return air duct through the internal return air duct, and then part of the gas is discharged to the outside by the exhaust fan, and the other part of the gas is mixed with the gas passing through the fresh air filter box, enters the circulation fan, and returns to the air collecting chamber for circulation after being heated by the electric heater.

[0011] In a preferred example, the present invention can be further configured as follows: the synchronous drive component includes a reduction motor arranged on the outer wall of the box body, and a reversing pulley arranged on the outer wall of the box body, the output shaft of the reduction motor is parallel to the roller shaft, and two driving pulleys 1 are connected to the output shaft of the reduction motor, and each guide roller is connected to a synchronous pulley at one end close to the output shaft of the reduction motor, and a driving pulley 2 is connected to one end of the roller shaft of the upper guide roller group and the lower guide roller group that is closest to the reduction motor, and the driving pulley 2 is located at the same end as the synchronous pulley on the roller shaft where the driving pulley is located and is located on the side of the synchronous pulley away from the box body, and there are two reversing pulleys, and the heights of the two reversing pulleys are lower than the height of the driving pulley 2 in the lower guide roller group; a synchronous belt is connected between each synchronous pulley of the upper guide roller group and each synchronous pulley of the lower guide roller group, a synchronous belt is connected between one driving pulley 1 and the driving pulley 2 in the upper guide roller group, and a synchronous belt is connected between another driving pulley 1 and the driving pulley 2 in the lower guide roller group and the two reversing pulleys.

[0012] By adopting the above technical solution, when the reduction motor is started, due to the linkage cooperation of the driving pulley one, the driving pulley two and the synchronous pulley in the upper guide roller group, the guide rollers in the upper guide roller group can rotate in the same direction as the reduction motor; due to the linkage cooperation of the driving pulley one, the driving pulley two, the reversing pulley and the synchronous pulley in the lower guide roller group, the guide rollers in the lower guide roller group can rotate in the opposite direction to the reduction motor, so the upper guide roller group and the lower guide roller group are used in combination to realize the transportation of PE film substrates.

[0013] In a preferred example, the present invention can be further configured as follows: a plurality of tensioning wheels are provided on the outer wall of the box body, and the tensioning wheels are in contact with the synchronous belt for tensioning the synchronous belt.

[0014] By adopting the above technical solution, the tensioning wheel can adjust the tension of the synchronous belt, thereby facilitating the reduction motor to drive the guide roller to rotate.

[0015] In a preferred example, the present invention can be further configured as follows: a plurality of inspection doors are provided on the box body.

[0016] By adopting the above technical solution, the inspection door can facilitate the staff to inspect the structure inside the box.

[0017] In a preferred example, the present invention can be further configured as follows: a boss is provided on a side of the retaining ring close to the bearing, the boss is in a circular ring shape, and the boss contacts the inner ring of the bearing.

[0018] By adopting the above technical solution, the boss is used in conjunction with the retaining ring, which can have a limiting effect on the roller body and improve the stability of the roller body on the roller shaft.

[0019] In summary, the present invention includes at least one of the following beneficial technical effects:

[0020] 1. The synchronous drive assembly is used in conjunction with the guide roller assembly to transport the PE film substrate, so that the PE film substrate passes through the box. The staff can adjust the synchronization of the roller body and the roller shaft by adjusting the tightness of the locking screw on the retaining ring, so that the substrate can always maintain low tension when passing through the roller body. At the same time, the circulating air supply assembly can circulate hot air into the box. The substrate is heated by the hot air and the low tension on the surface of the roller body, and it becomes smooth, thereby realizing low-tension leveling of the PE film substrate and reducing the possibility of damage to the PE film substrate;

[0021] 2. The boss on the retaining ring can limit the roller body and prevent the roller body from moving axially on the roller shaft, thereby improving the stability of the roller body and facilitating the maintenance of a low-tension environment for the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a schematic diagram for reflecting the overall structure of a low tension preheating oven for flattening a PE film substrate in an embodiment;

[0023] Figure 2 It is a schematic diagram for reflecting the internal structure of the box in the embodiment;

[0024] Figure 3 It is a schematic diagram of the structure of the circulating air supply component used to reflect the embodiment;

[0025] Figure 4 is a rear view of a low tension preheating oven for flattening a PE film substrate in an embodiment;

[0026] Figure 5 is a schematic diagram of the structure of the synchronous drive component used to reflect the embodiment;

[0027] Figure 6 It is a schematic diagram of the structure of the guide roller used to reflect the embodiment;

[0028] Figure 7 is a schematic diagram for illustrating the internal structure of the guide roller in the embodiment;

[0029] Figure 8 It is a schematic diagram of the structure of the retaining ring in the embodiment.

[0030] In the figure, 1. box body; 2. feed inlet; 3. discharge outlet; 4. guide roller; 41. roller shaft; 42. roller body; 5. seat bearing; 6. bearing; 7. retaining ring; 8. threaded hole; 9. internal return air duct; 10. external return air duct; 11. circulation fan; 12. air supply duct one; 13. electric heater; 14. air supply duct two; 15. air supply duct three; 16. air collecting chamber; 17. exhaust fan; 18. fresh air filter box; 19. reduction motor; 20. reversing pulley; 21. driving pulley one; 22. driving pulley two; 23. synchronous pulley; 24. synchronous belt; 25. tensioning pulley; 26. inspection door; 27. boss. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0032] Example:

[0033] Reference Figure 1-8 , is a low-tension preheating oven for leveling PE film substrates disclosed in the present invention, comprising a box body 1, two opposite vertical side walls of the box body 1 are respectively provided with a feed port 2 and a discharge port 3, the feed port 2 and the discharge port 3 are arranged opposite to each other, and a circulating air supply component is arranged on a vertical side wall of the box body 1 perpendicular to the feed port 2, and the circulating air supply component is used for circulating hot air into the box body 1.

[0034] The circulating air supply component includes an internal return air duct 9 arranged in the box body 1, an external return air duct 10 arranged outside the box body 1, a circulating fan 11 connected to the external return air duct 10, an air supply duct one 12 connected to the circulating fan 11, an electric heater 13 connected to the air supply duct one 12, an air supply duct two 14 connected to the electric heater 13, an air supply duct three 15 connected to the air supply duct two 14, and an air collecting chamber 16 connected to the air supply duct three 15. The external return air duct 10 is connected to the internal return air duct 9, and the external return air duct 10 is also connected to an exhaust fan 17 and a fresh air filter box 18. The air collecting chamber 16 is located in the box body 1 and below the lower guide roller group, and a plurality of blowing holes are opened on the top surface of the air collecting chamber 16.

[0035] A guide roller assembly is provided in the box body 1, and the guide roller assembly includes an upper guide roller group and a lower guide roller group. The upper guide roller group and the lower guide roller group are composed of a plurality of guide rollers 4 which are parallel to each other and evenly spaced. The axial direction of the guide roller 4 is parallel to the plane where the feed port 2 is located. The upper guide roller group and the lower guide roller group are arranged parallel to each other, and the plurality of guide rollers 4 of the upper guide roller group and the plurality of guide rollers 4 of the lower guide roller group are staggered with each other. The height of the lowest point of the lower guide roller group is located between the top edge and the bottom edge of the feed port 2.

[0036] The guide roller 4 includes a roller shaft 41 and a roller body 42 sleeved on the roller shaft 41. The roller shaft 41 is connected to bearings 5 ​​with seats at both ends. The bearings 5 ​​with seats are connected to the outer wall of the box body 1. The roller body 42 is connected to bearings 6 at both ends. The roller body 42 is connected to the roller shaft 41 through the bearings 6. Two retaining rings 7 are sleeved on the roller shaft 41. The two retaining rings 7 are respectively located at both ends of the length direction of the roller body 42. The retaining ring 7 includes two half rings and is spliced ​​by the two half rings. The two half rings are locked and connected by screws to ensure the relative stillness of the retaining ring 7 and the roller shaft 41. The retaining ring 7 is provided with four threaded holes 8 along its own axial direction. The threaded holes 8 are internally threaded with locking screws. One end of the locking screw passes through the threaded holes 8 and is tightly pressed against the end face of the roller body 42. A boss 27 is provided on one side of the retaining ring 7 close to the bearing 6. The boss 27 is annular and contacts the inner ring of the bearing 6. The boss 27 cooperates with the retaining ring 7 to limit the roller body 42 and improve the stability of the roller body 42 on the roller shaft 41.

[0037] A synchronous drive assembly is provided outside the box body, which is used to drive all the guide rollers 4 of the upper guide roller group and the guide rollers 4 of the lower guide roller group to rotate synchronously, and the rotation direction of the guide rollers 4 of the upper guide roller group is opposite to the rotation direction of the guide rollers 4 of the lower guide roller group.

[0038] The synchronous drive assembly includes a reduction motor 19 arranged on the outer wall of the box body 1, and a reversing pulley 20 arranged on the outer wall of the box body 1. The output shaft of the reduction motor 19 is parallel to the roller shaft 41. Two driving pulleys 1 21 are connected to the output shaft of the reduction motor 19. The end of each guide roller 4 close to the output shaft of the reduction motor 19 is connected to a synchronous belt 24 wheel 23. The end of the roller shaft 41 closest to the reduction motor 19 in the upper guide roller group and the lower guide roller group is connected to a driving pulley 2 22. The driving pulley 22 is located at the same end as the synchronous belt 24 wheel 23 on the roller shaft 41 where it is located and is located on the side of the synchronous belt 24 wheel 23 away from the box body 1. There are two reversing pulleys 20, and the heights of the two reversing pulleys 20 are both lower than the height of the driving pulley 2 22 in the lower guide roller group.

[0039] A synchronous belt 24 is connected between each synchronous belt 24 wheel 23 of the upper guide roller group and each synchronous belt 24 wheel 23 of the lower guide roller group, a synchronous belt 24 is connected between a driving pulley 1 21 and a driving pulley 2 22 in the upper guide roller group, and a synchronous belt 24 is connected between another driving pulley 1 21 and a driving pulley 2 22 in the lower guide roller group and two reversing pulleys 20. When the reduction motor 19 rotates, due to the linkage cooperation of the driving pulley 1 21, the driving pulley 2 22 and the synchronous belt 24 wheel 23 in the upper guide roller group, the guide roller 4 in the upper guide roller group can rotate in the same direction as the reduction motor 19; due to the linkage cooperation of the driving pulley 1 21, the driving pulley 2 22, the reversing pulley 20 and the synchronous belt 24 wheel 23 in the lower guide roller group, the guide roller 4 in the lower guide roller group can rotate in the opposite direction to the reduction motor 19.

[0040] When in use, the staff feeds the PE film substrate to be leveled into the feed port 2, and makes the substrate alternately pass around the guide rollers 4 of the lower guide roller group and the upper guide roller group in turn, and then the motor 19 is reduced in speed. Since the guide rollers 4 in the lower guide roller group and the guide rollers 4 in the upper guide roller group rotate in opposite directions, the lower guide roller group and the upper guide roller group cooperate to transport the substrate, and the substrate moves to the discharge port 3 and is finally discharged from the box 1 from the discharge port 3;

[0041] Since the retaining ring 7 and the roller shaft 41 remain relatively still, and the locking screw on the retaining ring 7 is pressed against the end surface of the roller body 42, the roller body 42, the retaining ring 7 and the roller shaft 41 can be protected to be relatively still, that is, the roller body 42 can rotate synchronously with the roller shaft 41 to form an active roller structure, thereby realizing low-tension operation of the substrate. In addition, the staff can tighten or loosen the locking screw according to actual needs, thereby changing the degree of synchronous rotation of the roller body 42 and the roller shaft 41, so as to ensure that the substrate can always maintain low-tension operation;

[0042] When the guide roller 4 is conveying the substrate, the external air passes through the fresh air filter box 18 and enters the external return air duct 10, and then passes through the circulating fan 11, the air supply duct 1 12, the electric heater 13, the air supply duct 2 14, and the air supply duct 3 15 in sequence and enters the air collecting chamber 16. The hot air in the air collecting chamber 16 is blown toward the substrate through the blowing holes above it. The substrate is heated by the hot air and the low tension on the surface of the roller body 42, so that low tension leveling can be achieved.

[0043] After the hot air blows through the substrate, it enters the external return air duct 10 through the internal return air duct 9, and then part of the gas is discharged to the outside by the exhaust fan 17, and the other part of the gas is mixed with the gas passing through the fresh air filter box 18, enters the circulation fan 11, and returns to the air collecting chamber 16 for circulation after being heated by the electric heater 13.

[0044] In addition, a plurality of tensioning wheels 25 are provided on the outer wall of the box body 1, and the tensioning wheels 25 are in contact with the synchronous belt 24, and are used to tension the synchronous belt 24, so as to facilitate the reduction motor 19 to drive the guide roller 4 to rotate. A plurality of inspection doors 26 are provided on the vertical side walls of the box body 1, so that the staff can inspect the structure inside the box body 1 conveniently.

[0045] To sum up, the implementation principle of this embodiment is: the synchronous drive component is used in conjunction with the guide roller component to transport the PE film substrate, so that the PE film substrate passes through the box body 1; the staff can adjust the synchronization of the roller body 42 and the roller shaft 41 by adjusting the tightness of the locking screw on the retaining ring 7, so that the substrate can always maintain low tension when passing through the roller body 42; at the same time, the circulating air supply component can circulate hot air into the box body 1, and the substrate is heated by the hot air and the low tension on the surface of the roller body 42, so that it becomes smooth, thereby realizing low-tension leveling of the PE film substrate and reducing the possibility of damage to the PE film substrate.

[0046] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A low tension preheating oven for flattening PE film substrates, comprising a box body (1), wherein two opposite vertical side walls of the box body (1) are respectively provided with a feed inlet (2) and a discharge outlet (3), wherein the feed inlet (2) and the discharge outlet (3) are arranged opposite to each other, and characterized in that: A circulating air supply component is provided on a vertical side wall of the box body (1) perpendicular to the feed port (2), and the circulating air supply component is used to circulate hot air into the box body (1); A guide roller assembly is provided in the box body (1), the guide roller assembly comprises an upper guide roller group and a lower guide roller group, the upper guide roller group and the lower guide roller group are both composed of a plurality of guide rollers (4) which are parallel to each other and evenly spaced, the axial direction of the guide rollers (4) is parallel to the plane where the feed port (2) is located, the upper guide roller group and the lower guide roller group are arranged in parallel to each other, and the plurality of guide rollers (4) of the upper guide roller group and the plurality of guide rollers (4) of the lower guide roller group are arranged in an interlaced manner, and the height of the lowest point of the lower guide roller group is located between the top edge and the bottom edge of the feed port (2); The guide roller (4) comprises a roller shaft (41) and a roller body (42) sleeved on the roller shaft (41); two ends of the roller shaft (41) are connected to bearings with seats (5); the bearings with seats (5) are connected to the outer wall of the box body (1); two ends of the roller body (42) are connected to bearings (6); the roller body (42) is connected to the roller shaft (41) via the bearings (6); two retaining rings (7) are sleeved on the roller shaft (41); the two retaining rings (7) are respectively The retaining ring (7) is respectively located at two ends of the roller body (42) in the length direction, and the retaining ring (7) includes two half rings and is formed by splicing the two half rings. The two half rings are locked and connected by screws, thereby ensuring the relative stillness of the retaining ring (7) and the roller shaft (41). The retaining ring (7) is provided with a plurality of threaded holes (8) along its own axial direction, and the threaded holes (8) are internally threadedly connected with locking screws, and one end of the locking screw passes through the threaded holes (8) and is tightly abutted against the end surface of the roller body (42); A synchronous drive assembly is provided outside the box body, and the synchronous drive assembly is used to drive the guide rollers (4) of all the upper guide roller groups to rotate synchronously and the guide rollers (4) of the lower guide roller group to rotate synchronously, and the rotation direction of the guide rollers (4) of the upper guide roller group is opposite to the rotation direction of the guide rollers (4) of the lower guide roller group; The circulating air supply component comprises an internal return air duct (9) arranged in the box body (1), an external return air duct (10) arranged outside the box body (1), a circulating fan (11) connected to the external return air duct (10), an air supply duct one (12) connected to the circulating fan (11), an electric heater (13) connected to the air supply duct one (12), an air supply duct two (14) connected to the electric heater (13), an air supply duct three (15) connected to the air supply duct two (14), and an air collecting chamber (16) connected to the air supply duct three (15); the external return air duct (10) is connected to the internal return air duct (9); an exhaust fan (17) and a fresh air filter box (18) are also connected to the external return air duct (10); the air collecting chamber (16) is located in the box body (1) and below the lower guide roller group; a plurality of blowing holes are provided on the top surface of the air collecting chamber (16); A boss (27) is provided on one side of the retaining ring (7) close to the bearing (6); the boss (27) is annular and in contact with the inner ring of the bearing (6).

2. A low tension preheating oven for flattening PE film substrates according to claim 1, characterized in that: The synchronous drive assembly comprises a reduction motor (19) arranged on the outer wall of the box body (1) and a reversing pulley (20) arranged on the outer wall of the box body (1); the output shaft of the reduction motor (19) is parallel to the roller shaft (41); two driving pulleys (21) are connected to the output shaft of the reduction motor (19); one end of each guide roller (4) close to the output shaft of the reduction motor (19) is connected to a synchronous belt (24) wheel (23); one end of the roller shaft (41) closest to the reduction motor (19) in the upper guide roller group and the lower guide roller group is connected to a driving pulley (22); the driving pulley (22) is in a positional relationship with the synchronous belt (24) wheel (23) on the roller shaft (41) where the driving pulley (22) is located. At the same end and located on the side of the synchronous belt (24) wheel (23) facing away from the box body (1), two reversing pulleys (20) are provided, and the heights of the two reversing pulleys (20) are both lower than the height of the driving pulley 2 (22) in the lower guide roller group; a synchronous belt (24) is connected between each synchronous belt (24) wheel (23) of the upper guide roller group and each synchronous belt (24) wheel (23) of the lower guide roller group, a synchronous belt (24) is connected between a driving pulley 1 (21) and the driving pulley 2 (22) in the upper guide roller group, and a synchronous belt (24) is connected between another driving pulley 1 (21) and the driving pulley 2 (22) in the lower guide roller group and the two reversing pulleys (20).

3. A low tension preheating oven for flattening PE film substrates according to claim 2, characterized in that: A plurality of tensioning wheels (25) are arranged on the outer wall of the box body (1); the tensioning wheels (25) are in contact with the synchronous belt (24) and are used to tension the synchronous belt (24).

4. A low tension preheating oven for flattening PE film substrates according to claim 1, characterized in that: The box body (1) is provided with a plurality of inspection doors (26).

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