Longitudinal stretcher

Abstract

The utility model discloses a longitudinal stretcher which is characterized in that a drying oven, a plurality of groups of stretching roller groups and a plurality of groups of driven roller groups are arranged on a rack, and speed differences exist among the stretching roller groups; at least one stretching roller set is arranged behind the drying oven in the advancing direction of the thin film; at least one stretching roller set and a plurality of driven roller sets are arranged in the drying oven, a preheating area and a heating area are arranged in the drying oven, the preheating area and the heating area are respectively provided with a heating module, the preheating area is provided with at least one driven roller set and at least one stretching roller set in the advancing direction of a film in a front-back mode, and the heating area is provided with a plurality of driven roller sets. According to the heating module, temperature compensation can be carried out on the end part of the main heating piece through the compensation heating piece, so that the temperature field distribution is more uniform, the temperature of the diaphragm in the width direction is consistent, the heating uniformity and the temperature uniformity are improved, local overheating or supercooling of the diaphragm is avoided, and the temperature control precision is high.

Description

Technical Field

[0001] This utility model relates to the field of film processing equipment, and in particular to a longitudinal stretching machine. Background Technology

[0002] PI (polyimide) film is a high-performance thin-film insulating material with excellent high and low temperature resistance, electrical insulation, adhesion, radiation resistance, and dielectric resistance. PI film is widely used in aerospace, electrical / electronic, microelectronics, nanotechnology, liquid crystal, separation membranes, lasers, locomotives, automobiles, precision machinery, and automated office machinery.

[0003] In the casting production process of PI film, a longitudinal stretching process is usually set up. The longitudinal stretching process achieves the longitudinal stretching of the film by controlling the speed difference between the driving roller and the driven roller of the longitudinal stretching machine. Existing longitudinal stretching machines generally have the following problems: (1) poor temperature consistency and low control accuracy; (2) poor roller leveling accuracy; (3) large longitudinal stretching error and inaccurate longitudinal stretching ratio. Utility Model Content

[0004] In response to the aforementioned shortcomings of existing longitudinal stretching machines, the applicant provides a longitudinal stretching machine with a reasonable structure, which improves temperature consistency and control accuracy, improves roller leveling accuracy, reduces longitudinal stretching error, and improves the accuracy of longitudinal stretching ratio.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A longitudinal stretching machine includes an oven, several sets of stretching rollers, and several sets of driven rollers mounted on a frame, with speed differences between the sets of stretching rollers. At least one set of stretching rollers is positioned after the oven along the film's travel direction. The oven contains at least one set of stretching rollers and several sets of driven rollers, and includes a preheating zone and a heating zone. Each of the preheating and heating zones is equipped with a heating module. The preheating zone has at least one set of driven rollers and one set of stretching rollers positioned forward and backward along the film's travel direction, while the heating zone has several sets of driven rollers.

[0007] As a further improvement to the above technical solution:

[0008] The heating module includes several horizontally arranged main heating elements and several horizontally arranged compensating heating elements. The main heating elements and the compensating heating elements are orthogonal. The main heating elements are parallel to the film width direction, and the compensating heating elements are perpendicular to the film width direction. The compensating heating elements are arranged above and / or below the two axial ends of the main heating elements.

[0009] The spacing between two adjacent main heating elements in the preheating zone is greater than the spacing between two adjacent main heating elements in the heating zone.

[0010] The stretching roller assembly includes a first active roller assembly and a second active roller assembly. The first active roller assembly is located outside the drying oven, and the second active roller assembly is located inside the drying oven. The driven roller assembly includes a first driven roller assembly, a second driven roller assembly, and a third driven roller assembly. The first driven roller assembly is located on the material receiving side of the second active roller assembly, and the second and third driven roller assemblies are located on the material discharge side of the second active roller assembly. The second and third driven roller assemblies are arranged vertically at intervals. The second active roller assembly and the first driven roller assembly are located in the preheating zone, and the second and third driven roller assemblies are located in the heating zone.

[0011] In the preheating zone, a heating module is set below the second driving roller group and the first driven roller group, and a heating module is set above the first driven roller group; in the heating zone, a heating module is set above the second driven roller group, and a heating module is set below the third driven roller group; a heating module is also set between the second driven roller group and the third driven roller group.

[0012] The stretching roller assembly includes one main roller and two driven rollers. The two driven rollers are symmetrically distributed below the main roller. The two ends of the main roller and the driven rollers are respectively mounted on an integrated first bearing seat via bearings. The main roller is connected to the power assembly.

[0013] A pressure roller is installed above the main roller. A clamping cylinder is connected to each end of the pressure roller. The clamping cylinder is fixed on the first bearing seat and can drive the pressure roller to move up and down.

[0014] Each stretching roller assembly is equipped with a speed measuring device, which detects the linear velocity of the main roller and the driven roller.

[0015] The driven roller assembly includes several driven rollers arranged at intervals along the horizontal direction, with each end of the driven rollers mounted on an integral second bearing housing via bearings.

[0016] The frame includes a base and a support erected on the base. A mounting surface is provided on the base and inside the support. The oven is mounted on the mounting surface. An adjustment component is provided on the base corresponding to the oven. Positioning components are provided on the support corresponding to the stretching roller group and the driven roller group. Each roller group is mounted on the corresponding positioning component.

[0017] The beneficial effects of this utility model are as follows:

[0018] The heating module of this invention can provide temperature compensation to the end of the main heating element through the compensation heating element, so that the temperature field distribution is more uniform, the temperature in the width direction of the diaphragm is consistent, the heating uniformity and temperature uniformity are improved, and local overheating or undercooling of the diaphragm is avoided, resulting in high temperature control accuracy.

[0019] In this invention, several roller shafts of the stretching roller group and the driven roller group are respectively mounted on an integrated bearing housing. The integrated bearing housing ensures the parallelism between the roller shafts, improves the leveling accuracy of the roller shafts, and prevents the film from deviating.

[0020] The stretching roller assembly of this invention is independently driven. The speed measuring device detects the actual linear speed of the main roller and the driven roller, compares the actual linear speed with the speed of the power component, avoids longitudinal stretching error caused by slippage, reduces longitudinal stretching error, improves the accuracy of longitudinal stretching ratio, and at the same time provides a warning on the tension state of the film. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 This is a schematic diagram of the main structure of this utility model.

[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of the frame.

[0024] Figure 4 This is a schematic diagram of the longitudinal section of the oven.

[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of the oven.

[0026] Figure 6 This is a schematic diagram of the three-dimensional structure of the stretching roller assembly.

[0027] In the picture:

[0028] 1. Frame; 11. Base; 111. Mounting surface; 12. Bracket; 13. Positioning component; 14. Mounting adjustment component;

[0029] 2. Oven; 20. Inner cavity; 201. Preheating zone; 202. Heating zone; 21. Feed inlet; 22. Discharge outlet;

[0030] 3. First active roller group; 4. Second active roller group; 31. Main roller; 32. Driven roller; 33. First bearing housing; 34. Pressure roller; 35. Power assembly; 36. Pressing cylinder;

[0031] 5. First driven roller group; 6. Second driven roller group; 7. Third driven roller group; 51. Driven roller; 52. Second bearing housing;

[0032] 8. Heating module; 81. Main heating element; 82. Compensating heating element;

[0033] 100. Film. Detailed Implementation

[0034] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0035] like Figure 1 , Figure 2 As shown, the longitudinal stretching machine of this utility model is applied in the casting production process of film 100. Its frame 1 is equipped with an oven 2, several sets of stretching rollers, and several sets of driven rollers. In this embodiment, two sets of stretching rollers, a first active roller set 3 and a second active roller set 4, are provided, along with three sets of driven rollers: a first driven roller set 5, a second driven roller set 6, and a third driven roller set 7. The oven 2 and the first active roller set 3 are arranged back-to-back along the traveling direction of film 100. The second active roller set 4, the first driven roller set 5, the second driven roller set 6, and the third driven roller set 7 pass through the oven 2. The first driven roller set 5 is located on the receiving side of the second active roller set 4, and the second driven roller set 6 and the third driven roller set 7 are located on the discharging side of the second active roller set 4. The second driven roller set 6 and the third driven roller set 7 are arranged vertically at intervals.

[0036] like Figure 3 As shown, the frame 1 includes a base 11 and supports 12 erected on the discharge side and front and rear sides of the base 11. A mounting surface 111 is provided on the base 11, located inside the supports 12, and the oven 2 is mounted on the mounting surface 111. An adjustment component 14 is provided on the base 11 corresponding to the oven 2, allowing the oven 2 to be leveled. Positioning components 13 are provided on the supports 12 corresponding to the stretching roller group and the driven roller group, with each roller group mounted on its corresponding positioning component 13. The oven 2 and each roller group are connected and supported by the frame 1; there is no direct rigid connection between the oven 2 and the roller groups, reducing the processing requirements of the oven 2.

[0037] like Figure 4 , Figure 5 As shown, the oven 2 has a feed inlet 21 on the receiving side and a discharge outlet 22 on the discharging side. The inner cavity 20 of the oven 2 is divided into a preheating zone 201 and a heating zone 202. The preheating zone 201 is located near the feed inlet 21, and the heating zone 202 is located near the discharge outlet 22. The second driving roller group 4 and the first driven roller group 5 are arranged in the preheating zone 201, and the second driven roller group 6 and the third driven roller group 7 are arranged in the heating zone 202. Heating modules 8 are respectively provided in the preheating zone 201 and the heating zone 202; Figure 4 As shown, in the preheating zone 201, a heating module 8 is arranged below the second driving roller group 4 and the first driven roller group 5, and a heating module 8 is arranged above the first driven roller group 5; in the heating zone 202, a heating module 8 is arranged above the second driven roller group 6, and a heating module 8 is arranged below the third driven roller group 7; a heating module 8 is also arranged between the second driven roller group 6 and the third driven roller group 7. Figure 5As shown, the heating module 8 includes several horizontally arranged main heating elements 81 and several horizontally arranged compensating heating elements 82. The main heating elements 81 and the compensating heating elements 82 are orthogonal, with the main heating elements 81 parallel to the film width direction and the compensating heating elements 82 perpendicular to the film width direction. The compensating heating elements 82 are positioned above and / or below the axial ends of the main heating elements 81, providing temperature compensation to the ends of the main heating elements 81, resulting in a more uniform temperature field distribution, consistent temperature across the film width of the thin film 100, improved heating uniformity and temperature uniformity, and prevention of localized overheating or undercooling of the thin film 100, achieving high temperature control accuracy. The spacing between two adjacent main heating elements 81 in the heating module 8 of the preheating zone 201 is greater than the spacing between two adjacent main heating elements 81 in the heating module 8 of the heating zone 202.

[0038] like Figure 1 , Figure 6 As shown, the active roller group includes a first active roller group 3 and a second active roller group 4. There is a speed difference between the first active roller group 3 and the second active roller group 4, which achieves longitudinal stretching of the film 100. The stretching roller group includes a main roller 31 and two driven rollers 32. The two driven rollers 32 are symmetrically distributed below the main roller 31, and the three rollers are arranged in a triangular pattern. The main roller 31 and the driven rollers 32 are respectively mounted on an integrated T-shaped first bearing seat 33 via bearings at both ends. The three roller shafts are mounted on the integrated bearing seat, which ensures the parallelism between the roller shafts and prevents the film 100 from deviating. The main roller 31 is connected to the power assembly 35 and is driven to rotate actively by the power assembly 35. The speed difference between the main roller 31 and the driven rollers 32 achieves longitudinal stretching of the film 100. A pressure roller 34 is installed above the main roller 31. Pressure cylinders 36 are connected to both ends of the pressure roller 34 and are fixed to the first bearing seat 33. The pressure cylinders 36 can drive the pressure roller 34 to move up and down to press or release the film 100. Speed ​​measuring devices (not shown in the figure) are respectively installed on the first active roller group 3 and the second active roller group 4. The speed measuring devices detect the actual linear speed of the main roller 31 and the driven roller 32, compare the actual linear speed with the speed of the power assembly 35, avoid longitudinal tension error caused by slippage, reduce longitudinal tension error, improve the accuracy of the longitudinal tension ratio, and simultaneously provide a warning about the tension state of the film 100.

[0039] like Figure 1 As shown, the driven roller group includes several driven rollers 51 arranged at intervals along the horizontal direction. The two ends of the driven rollers 51 are respectively mounted on an integrated "I"-shaped second bearing seat 52 by bearings. The driven roller shafts are set on the integrated bearing seat. The parallelism between the roller shafts is ensured by the integrated bearing seat to prevent the film 100 from deviating.

[0040] In practical use, this utility model, for example Figure 2As shown, the film 100 enters the preheating zone 201 from the feed inlet 21 of the oven 2, winds around several driven rollers 51 of the first driven roller group 5, enters the second driving roller group 4, and sequentially winds around driven roller 32-main roller 31-driven roller 32 before entering the heating zone 202. After passing through several driven rollers 51 of the second driven roller group 6 and the third driven roller group 7 alternately, it exits from the discharge port 22 of the oven 2, enters the first driving roller group 3, and sequentially winds around driven roller 32-main roller 31-driven roller 32 before being fed to the next process. After being heated in the preheating zone 201 and the heating zone 202 of the oven 2, the film 100 softens uniformly, and the longitudinal stretching of the film 100 is achieved by the speed difference between the first driving roller group 3 and the second driving roller group 4.

[0041] The above description is an explanation of the present utility model and not a limitation thereof. The present utility model can be modified in any form without departing from its spirit.

Claims

1. A longitudinal stretching machine, characterized in that: The frame (1) is equipped with an oven (2), several sets of stretching rollers and several sets of driven rollers, and there is a speed difference between each set of stretching rollers; at least one set of stretching rollers is set after the oven (2) along the traveling direction of the film (100); at least one set of stretching rollers and several sets of driven rollers are set inside the oven (2), and a preheating zone (201) and a heating zone (202) are set inside the oven (2). The preheating zone (201) and the heating zone (202) are respectively equipped with heating modules (8). At least one set of driven rollers and one set of stretching rollers are set in the preheating zone (201) along the traveling direction of the film (100), and several sets of driven rollers are set in the heating zone (202).

2. The longitudinal stretching machine according to claim 1, characterized in that: The heating module (8) includes several horizontally arranged main heating elements (81) and several horizontally arranged compensating heating elements (82). The main heating elements (81) and the compensating heating elements (82) are orthogonal. The main heating elements (81) are parallel to the film width direction, and the compensating heating elements (82) are perpendicular to the film width direction. The compensating heating elements (82) are arranged above and / or below the axial ends of the several main heating elements (81).

3. The longitudinal stretching machine according to claim 2, characterized in that: The spacing between two adjacent main heating elements (81) of the heating module (8) in the preheating zone (201) is greater than the spacing between two adjacent main heating elements (81) of the heating module (8) in the heating zone (202).

4. The longitudinal stretching machine according to claim 1, characterized in that: The stretching roller group includes a first active roller group (3) and a second active roller group (4). The first active roller group (3) is located outside the oven (2), and the second active roller group (4) is located inside the oven (2). The driven roller group includes a first driven roller group (5), a second driven roller group (6), and a third driven roller group (7). The first driven roller group (5) is located on the material receiving side of the second active roller group (4), and the second driven roller group (6) and the third driven roller group (7) are located on the material discharging side of the second active roller group (4). The second driven roller group (6) and the third driven roller group (7) are arranged vertically at intervals. The second active roller group (4) and the first driven roller group (5) are located in the preheating zone (201), and the second driven roller group (6) and the third driven roller group (7) are located in the heating zone (202).

5. The longitudinal stretching machine according to claim 4, characterized in that: In the preheating zone (201), a set of heating modules (8) is provided below the second driving roller group (4) and the first driven roller group (5), and a set of heating modules (8) is provided above the first driven roller group (5); in the heating zone (202), a set of heating modules (8) is provided above the second driven roller group (6), and a set of heating modules (8) is provided below the third driven roller group (7); a heating module (8) is also provided between the second driven roller group (6) and the third driven roller group (7).

6. The longitudinal stretching machine according to claim 1, characterized in that: The stretching roller assembly includes a main roller (31) and two slave rollers (32). The two slave rollers (32) are symmetrically distributed below the main roller (31). The two ends of the main roller (31) and the slave rollers (32) are respectively mounted on an integrated first bearing seat (33) through bearings. The main roller (31) is connected to the power assembly (35).

7. The longitudinal stretching machine according to claim 6, characterized in that: A pressure roller (34) is provided above the main roller (31). The two ends of the pressure roller (34) are connected to a pressing cylinder (36). The pressing cylinder (36) is fixed on the first bearing seat (33). The pressing cylinder (36) can drive the pressure roller (34) to move up and down.

8. The longitudinal stretching machine according to claim 6, characterized in that: Speed ​​measuring devices are installed on the stretching roller assembly to detect the linear speed of the main roller (31) and the driven roller (32).

9. The longitudinal stretching machine according to claim 1, characterized in that: The driven roller assembly includes several driven rollers (51) arranged at intervals along the horizontal direction. The two ends of the driven rollers (51) are respectively mounted on an integral second bearing seat (52) by bearings.

10. The longitudinal stretching machine according to claim 1, characterized in that: The frame (1) includes a base (11) and a support (12) erected on the base (11). A mounting surface (111) is provided on the base (11) and located on the inner side of the support (12). The oven (2) is installed on the mounting surface (111). An installation adjustment component (14) is provided on the base (11) corresponding to the oven (2). A positioning component (13) is provided on the support (12) corresponding to the stretching roller group and the driven roller group respectively. Each roller group is installed on the corresponding positioning component (13).

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