CN115352039A

CN115352039A - Film plane stretching device

Info

Publication number: CN115352039A
Application number: CN202210890875.8A
Authority: CN
Inventors: 李晓阳
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2022-11-18

Abstract

The invention belongs to the technical field of film processing devices, and particularly relates to a film plane stretching device which comprises a film conveying unit, a heating and cooling unit and a plane stretching unit, wherein the film conveying unit comprises a first upstream roller, a second upstream roller, a first downstream roller and a second downstream roller which are sequentially arranged along a conveying direction, the plane stretching unit comprises a base, a motor, a stretching module and a clamping module, the motor drives a first connecting rod to rotate, the stretching of a film along the conveying direction of the film is realized under the matching of a first roller, a second sliding rail and a second sliding block, and a controller controls the motor to change the direction by arranging the first fixing block and the second fixing block so as to realize the stretching of the film along the vertical direction of the conveying direction of the film.

Description

Film plane stretching device

Technical Field

The invention belongs to the technical field of film processing devices, and particularly relates to a film plane stretching device.

Background

At present, the existing film is mainly based on a tape casting process, the film is stretched in a proper temperature range (under a high elastic state) above the glass transition temperature and below the melting point by a stretcher in sequence along the longitudinal direction or the transverse direction by a certain multiple (less than 3.5 times) under the action of external force, so that molecular chains or crystalline planes are oriented and orderly arranged in the direction parallel to the plane of the film, and finally the film can be prepared through cooling and subsequent treatment, namely after resin is melted and extruded to be shaped on a cooling roller, the resin is stretched in a certain proportion (less than 3.5 times) in the conveying direction of the breathable film.

Disclosure of Invention

The invention provides a film plane stretching device, which solves the problems in the prior art.

The technical scheme of the invention is realized as follows: a film plane stretching device comprises a film conveying unit, a heating and cooling unit and a plane stretching unit, wherein the heating and cooling unit comprises a controller, a temperature control module, a hot air fan and an air cooler which are electrically connected, the plane stretching unit comprises a base, a motor, a stretching module and a clamping module are fixedly arranged on the base, the motor is electrically connected with the controller, the stretching module comprises a first slide rail and a second slide rail which are vertically arranged, a first slide block is slidably connected onto the first slide rail, the top of the first slide block is fixedly connected with a first guide rail, the top of the first guide rail is fixedly connected with a second guide rail, a second slide block is slidably connected onto the second slide rail, the top of the second slide block is fixedly connected with a supporting block, a first connecting block is fixedly connected onto the side wall of the supporting block, the connecting block is hinged with a second connecting rod, the second connecting rod is hinged with a first connecting rod, and the first connecting rod is fixedly connected with an output shaft of the motor; the clamping module comprises a plurality of clamping components, the clamping components are sequentially and movably arranged on the second guide rail, a second connecting block is fixedly connected to one side end face, close to the motor, of each clamping component, a plurality of middle bearing components are fixedly arranged between the second connecting blocks, hinged rod components are movably connected to two sides of each second connecting block, connecting plates are fixedly connected to two sides of the clamping module respectively, and the connecting plates are fixedly connected to the top ends of the supporting blocks.

In a preferred embodiment, a guide groove is provided on a side wall of the first guide rail close to the first connecting rod, a first roller is rotatably provided at the joint of the first connecting rod and the second connecting rod, and the center line of the rotating shaft of the first roller is kept collinear with the center line of the hinge rotating shaft of the first connecting rod and the second connecting rod, and the first roller rolls along the guide groove.

As a preferred embodiment, the clamping assembly comprises a clamping block, a clamping handle is movably arranged at the top of the clamping block, the clamping handle can firmly clamp the film through rotation, 2 groups of second rollers are rotatably arranged at the bottom of the clamping block, and the 2 groups of second rollers are symmetrically arranged at two sides of the second guide rail and can roll along two side surfaces of the second guide rail.

As a preferred embodiment, two sides of the second connecting block are respectively and fixedly provided with a first rotating column, and the center of one side end surface of the second connecting block, which is far away from the clamping block, is provided with a threaded hole.

As a preferred embodiment, the middle bearing assembly comprises a middle bearing shell, a sliding groove is formed in the middle bearing shell, a separation baffle is tightly arranged in the middle of the sliding groove, springs are tightly connected to two sides of the separation baffle, sliding columns are tightly connected to two sides of the springs, the sliding columns are slidably connected with the middle bearing shell, threads are arranged on the surfaces of the sliding columns, one ends, far away from the middle bearing shell, of the sliding columns are respectively and tightly connected with threaded holes of corresponding second connecting blocks, and when the springs do not elastically deform, the plane stretching unit is at an initial position.

As a preferred embodiment, the hinge rod subassembly includes two plectanes, two it is connected with the second column spinner to rotate between the plectane, the both ends fixedly connected with column spinner baffle of second column spinner, the square articulated post of symmetry fixedly connected with on the lateral wall of plectane, the thickness of articulated post is greater than the thickness of circular slab, two the plectane keeps closely laminating, the both ends fixedly connected with pivot cover of articulated post, the pivot cover adopts the cover to establish with first column spinner and is connected.

As a preferred embodiment, the second guide rail includes two guide rails symmetrically arranged, each of the second guide rails is provided with 5 clamping assemblies, and 4 hinge rod assemblies are arranged between the 5 clamping assemblies.

As a preferred embodiment, the center of the first connecting rod is fixedly connected with an output shaft of a motor, the length of the first connecting rod is greater than or equal to 2 times that of the second connecting rod, the thickness of the first connecting rod is greater than or equal to 2 times that of the second connecting rod, an included angle between the initial positions of the first connecting rod and the second connecting rod is 120 degrees, the number of the second connecting rods is two, and the two second connecting rods are kept parallel.

As a preferred embodiment, two ends of the first slide rail are provided with a first fixed block in a fastening manner, two ends of the second slide rail are provided with a second fixed block in a fastening manner, the first fixed block and the second fixed block are electrically connected with the controller, and when the first sliding block contacts the first fixed block or the second sliding block contacts the second fixed block, the controller can control the motor to change the steering direction.

As a preferable embodiment, the film conveying unit includes a first upstream roller, a second upstream roller, a first downstream roller, and a second downstream roller, which are arranged in this order in the conveying direction.

After the technical scheme is adopted, the invention has the beneficial effects that:

when the film plane stretching device is used, the first connecting rod is driven to rotate through the motor, then the two second connecting rods are driven to rotate, the clamping assemblies can be pushed to move away from each other along the second sliding rail under the matching of the first roller, the second sliding rail and the second sliding block, the stretching of a film in the conveying direction of the film is realized, meanwhile, the spring in the middle bearing shell generates compression deformation and generates expansion force, then, the controller controls the motor to change the direction when the second sliding block contacts the second fixing block, the clamping assemblies can be pushed to move in opposite directions along the second sliding rail, at the moment, the first roller rolls along the guide groove and generates pushing force, the expansion force of the pushing force spring forms resultant force in the same direction, the first guide rail and the second guide rail are pushed to move away from each other along the first sliding rail, the stretching of the film in the direction perpendicular to the conveying direction of the film is realized, and when the first sliding block contacts the first fixing block, the controller controls the motor to change the direction, so that the multiple plane stretching operation of the film is realized;

simultaneously, film plane stretching device has integrateed film conveying unit and heating cooling unit, and film conveying unit can connect preceding process and back process, realizes the continuity of production process, improves work efficiency, and heating cooling unit passes through the hot-blast temperature of controller control air heater and the cold wind temperature of air-cooler to satisfy preheating, heating and cooling effect to the film, improve the tensile quality of film, and can finalize the design fast, improve work efficiency.

Drawings

FIG. 1 is a schematic side view of a film stretching apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a stretching module according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a clamping module according to an embodiment of the invention;

FIG. 4 is a top view of a combination stretching module and clamping module according to an embodiment of the present invention;

FIG. 5 is a rear view of a clamping assembly according to one embodiment of the present invention;

FIG. 6 is an isometric view of a clamping assembly according to an embodiment of the present invention;

FIG. 7 is a schematic structural view of a center bearing assembly according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a hinge rod assembly according to an embodiment of the present invention.

In the figure, 1-a film transfer unit; 10-previous process; 100-post process; 11-a first upstream roller; 12-a second upstream roller; 13-a first electric machine; 14-a first downstream roller; 15-a second motor; 16-a second downstream roller; 2-a heating and cooling unit; 21-a controller; 22-a temperature control module; 231-a hot air blower; 232-air cooler; 3-a planar stretching unit; 31-a base; 32-a stretching module; 32 a-a first slide rail; 32 b-a first slider; 32 c-a first guide rail; 32 d-a second guide rail; 32 e-a second slide rail; 32 f-second slider; 32 g-support block; 32 h-first link; 32 i-first roller; 32 j-a second link; 32 k-first connection block; 32 m-guide groove; 32 n-a first fixed block; 32 p-second fixed block; 33-a clamping module; 331-a clamping assembly; 331 a-a clamping block; 331 b-grip handle; 331 c-a second roller; 332-a second connection block; 332 a-first spin column; 332 b-threaded hole; 333-a center bearing assembly; 333 a-middle bearing shell; 333 b-sliding groove; 333 c-a dividing baffle; 333 d-spring; 333 e-sliding column; 334-hinge-rod assemblies; 334 a-circular plate; 334 b-hinge columns; 334 c-second spin column; 334 d-rotating shaft sleeve; 334 e-spin column baffles; 335-connecting plate; 34-motor.

Detailed Description

As shown in fig. 1, a film planar stretching apparatus includes a film transfer unit 1, a heating and cooling unit 2, and a planar stretching unit 3, and a pre-process 10 and a post-process 100 are provided, wherein the pre-process 10 includes a film forming facility and a film feeding facility, which are not shown, and the post-process 100 includes a film winding facility and a wrapping facility, which are not shown, the film transfer unit includes a first upstream roller 11, a second upstream roller 12, a first downstream roller 14, and a second downstream roller 16, which are provided in this order in a transfer direction, the second upstream roller 12 is rotated by a first motor 13 and the first downstream roller 14 is rotated by a second motor 15, the film is transferred from the pre-process 10 to the heating and cooling unit 2 and the planar stretching unit 3 by the first upstream roller 11 by the second upstream roller 12, and after the stretching effect is achieved, the film is transferred to the post-process 100 by the second downstream roller 16 by the first downstream roller 14.

Heating and cooling unit 2 includes electrically connected controller 21, temperature control module 22, air heater 231 and air-cooler 232, before the film gets into heating and cooling unit 2, control air heater 231 blowout hot-blast through controller 21 and preheat, the standard tensile temperature of film sets to T1, then temperature control module 22 sets up the preheating temperature of air heater 231 to T2 degree centigrade, wherein T2 is greater than T1, after the film gets into heating and cooling unit 2 under film conveying unit 1 effect, temperature control module 22 promotes the hot-blast temperature of air heater 231 to T degree centigrade, after the drawing is accomplished, controller 21 controls air-cooler 232 blowout cold wind, temperature control module 22 sets up the cold wind temperature of air-cooler 232 to T3 and is less than T1 degree centigrade, the film after the drawing realizes quick design under the effect of cold wind, wherein hot-blast and the cold wind that air-blower 231 and air-cooler 232 blown out cover the film surface completely.

The plane stretching unit 3 comprises a base 31, a stretching module 32, a clamping module 33 and a motor 34 are fixedly arranged on the base 31, wherein the stretching module 32 comprises a first slide rail 32a and a second slide rail 32e which are arranged perpendicular to each other, the number of the first slide rail 32a and the number of the second slide rail 32e are respectively two, the top of each first slide rail 32a is slidably connected with two first sliders 32b, the tops of the two corresponding first sliders 32b on the two first slide rails 32a are fixedly connected with a first guide rail 32c, the top of the first guide rail 32c is fixedly connected with a second guide rail 32d, the top of each second slide rail 32e is slidably connected with a second slider 32f, the top of each second slider 32f is fixedly connected with a supporting block 32g, the opposite side walls of the two supporting blocks 32g are respectively and fixedly connected with a first connecting block 32k by screw threads, the first connecting block 32k is hinged with a second connecting rod 32j, and the end of the second connecting rod 32j far away from the first connecting block 32k is respectively hinged with two ends of a first connecting rod 32h, two second connecting rods 32j are provided, the two second connecting rods 32j are always kept parallel, the center position of the first connecting rod 32h is fixedly connected with the output shaft of the motor 34, the motor 34 is electrically connected with the controller 21, the side wall of the first guide rail 32c close to the first connecting rod 32h is provided with a guide groove 32m, the hinged part of the first connecting rod 32h and the second connecting rod 32j is rotatably provided with a first roller 32i, the central line of the rotating shaft of the first roller 32i and the central line of the hinged rotating shaft of the first connecting rod 32h and the second connecting rod 32j are kept collinear, the first roller 32i can roll along the guide groove 32m to ensure the stability of the horizontal movement of the first connecting rod 32h and the second connecting rod 32j, when the motor 34 rotates, the first connecting rod 32h can be driven to rotate by taking the output shaft of the motor 34 as the rotating shaft, and then the two second connecting rods 32j are driven to rotate around the hinges at the two ends of the first connecting rod 32h, the two supporting blocks 32g are pushed to move along the direction of the second slide rail 32e, and at the same time, when the motor 34 rotates in the opposite direction, the two first guide rails 32c and the second guide rails 32d are pushed to move along the direction of the first slide rail 32a under the action of the first rollers 32 i.

The clamping module 33 includes a plurality of clamping components 331, the plurality of clamping components 331 are movably disposed on the second guide rail 32d in sequence, a second connecting block 332 is fixedly connected to a side end face of the clamping component 331 close to the motor 34, first rotating columns 332a are fixedly disposed on two sides of the second connecting block 332 respectively, a threaded hole 332b is formed in a side end face center of the second connecting block 332 far away from the clamping block 331a, a plurality of middle bearing components 333 are fixedly disposed between the second connecting blocks 332, hinge rod components 334 are movably connected to two sides of the second connecting block 332, connecting plates 335 are fixedly connected to two sides of the clamping module 33 respectively, and the connecting plates 335 are fixedly connected to the top ends of the supporting blocks 32 g.

Further, the clamping assembly 331 includes the clamping block 331a, the activity of clamping block 331a top is provided with the clamping handle 331b, the clamping handle 331b can rotate around the clamping block 331a, can firmly clamp the film through rotating the clamping handle 331b, external high atmospheric pressure can be connected to clamping block 331a and clamping handle 331b, after putting through external high atmospheric pressure, clamping handle 331b is rotatory with the centre gripping film, after closing external high atmospheric pressure, clamping handle 331b is rotatory in order to release the centre gripping film, this technical scheme is prior art, no longer describe. The bottom of the clamping block 331a is rotatably provided with 2 sets of second rollers 331c,2 sets of second rollers 331c are symmetrically disposed on two sides of the second guide rail 32d, and 2 sets of second rollers 331c can roll along the lateral surfaces of the two sides of the second guide rail 32 d.

Furthermore, the middle bearing assembly 333 comprises a middle bearing shell 333a, a sliding groove 333b is formed in the middle bearing shell 333a, a separation baffle 333c is tightly fixed in the middle of the sliding groove 333b, springs 333d are tightly connected to two sides of the separation baffle 333c, sliding columns 333e are tightly connected to two sides of the springs 333d, when the springs 333d are not elastically deformed, the clamping assembly 331 is in an initial position before the operation of the equipment, the sliding columns 333e are slidably connected with the middle bearing shell 333a, threads are formed on the surfaces of the sliding columns 333e, and one ends of the sliding columns 333e far away from the middle bearing shell 333a are respectively and tightly connected with threaded holes 332b of two corresponding second connecting blocks 332.

Further, the hinge rod assembly 334 comprises two circular plates 334a, a second rotating column 334c is rotatably connected between the two circular plates 334a, two ends of the second rotating column 334c are fixedly connected with rotating column baffles 334e, square hinge columns 334b are symmetrically and fixedly connected to the side walls of the circular plates 334a, the thickness of the hinge columns 334b is larger than that of the circular plates 334a, the two circular plates 334a are tightly attached, the hinge columns 334b can rotate around the second rotating column 334c, meanwhile, two ends of the hinge columns 334b are fixedly connected with rotating shaft sleeves 334d, the rotating shaft sleeves 334d are connected with the first rotating column 332a in a sleeved mode, and the rotating shaft sleeves 334d rotate by taking the first rotating column 332a as a rotating shaft.

Furthermore, the two ends of the first slide rail 32a and the second slide rail 32e are respectively and fixedly provided with a first fixed block 32n and a second fixed block 32p, the first fixed block 32n and the second fixed block 32p are electrically connected with the controller 21, when the first sliding block 32b contacts the first fixed block 32n or the second sliding block 32f contacts the second fixed block 32p, the controller 21 can control the motor 34 to change the direction, and meanwhile, the first fixed block 32n and the second fixed block 32p are detachable, so that the positions of the first fixed block 32n and the second fixed block 32p can be correspondingly adjusted according to the requirements of plane stretching of different film products, and the application to different film products is realized.

In this embodiment, the second guide rail 32d comprises two symmetrically arranged guide rails, 5 clamping assemblies 331,5 are arranged on each second guide rail 32d, 4 hinge rod assemblies 334 are arranged between the clamping assemblies 331, and the two clamping assemblies 331 connected with the same center bearing assembly 333 on the two second guide rails 32d are kept flush and synchronous during the moving process.

In this embodiment, the length of the first link 32h is greater than or equal to 2 times the length of the second link 32j, the thickness of the first link 32h is greater than or equal to 2 times the thickness of the second link 32j, and the initial position included angle between the first link 32h and the second link 32j is 120 degrees.

The working principle is as follows: before processing, the positions of the first fixing block 32n and the second fixing block 32p are adjusted to meet the requirement of plane stretching of a film product, then the controller 21 controls the hot air blower 231 to spray hot air to preheat, after the film making equipment and the film sending equipment in the former process 10 send the film to the first upstream roller 11, the film is driven to rotate by the first motor 13, the film is conveyed to the heating and cooling unit 2 and the plane stretching unit 3 from the former process 10 under the action of the first upstream roller 11 and the second upstream roller 12, then the clamping handle 331b is rotated to firmly clamp the film, and the controller 21 controls the temperature of the hot air blower 231 to be adjusted to a target temperature.

The motor 34 is started, the first connecting rod 32h can be driven to rotate by taking an output shaft of the motor 34 as a rotating shaft, then the two second connecting rods 32j are driven to rotate around hinges at two ends of the first connecting rod 32h, under the cooperation of the first roller 32i, the second sliding rail 32e and the second sliding block 32f, the two supporting blocks 32g can be pushed to move away from each other along the second sliding rail 32e, then the clamping component 331 is pushed to move away from each other along the second sliding rail 32e, the stretching of the film in the direction along the second sliding rail 32e (the conveying direction of the film) is realized, at the moment, the spring 333d in the middle bearing shell 333a generates compression deformation, and the spring 333d generates expansion force.

When the second slider 32f contacts the second fixed block 32p, the controller 21 controls the motor 34 to change the direction of rotation, so as to push the two support blocks 32g to move along the second slide rail 32e in opposite directions, and further push the clamping assembly 331 to move along the second slide rail 32e in opposite directions, the first link 32h rotates around the output shaft of the motor 34 as a rotating shaft, at this time, the first roller 32i rolls along the guide groove 32m and generates a pushing force, the pushing force and the expanding force of the spring 333d form a resultant force in the same direction, and pushes the first guide rail 32c and the second guide rail 32d to move away from each other along the first slide rail 32a, so as to stretch the film in the direction along the first slide rail 32a (the direction perpendicular to the conveying direction of the film), and when the first slider 32b contacts the first fixed block 32n, the controller 21 controls the motor 34 to change the direction of rotation, so as to achieve multiple planar stretching operations of the film.

After the film plane stretching processing is completed, the motor 34 stops operating, the plane stretching unit 3 returns to the initial position under the action of the spring 333d, the controller 21 controls the air cooler 232 to spray cold air, the stretched film is rapidly shaped under the action of the cold air, then the clamping handle 331b is rotated to release the film, the second motor 15 is started to drive the first downstream roller 14 to rotate, and the film enters the post-processing step 100 through the second downstream roller 16 under the action of the first downstream roller 14.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A film plane stretching device comprises a film conveying unit, a heating and cooling unit and a plane stretching unit, and is characterized in that the heating and cooling unit comprises a controller, a temperature control module, an air heater and an air cooler which are electrically connected, the plane stretching unit comprises a base, a motor, a stretching module and a clamping module are fixedly arranged on the base, the motor is electrically connected with the controller, the stretching module comprises a first slide rail and a second slide rail which are vertically arranged, a first slide block is slidably connected onto the first slide rail, a first guide rail is fixedly connected onto the top of the first slide rail, a second guide rail is fixedly connected onto the top of the first guide rail, a second slide block is slidably connected onto the second slide rail, a supporting block is fixedly connected onto the top of the second slide block, a first connecting block is fixedly connected onto the side wall of the supporting block, a second connecting rod is hinged onto the connecting block, the second connecting rod is hinged onto the second connecting rod, and the first connecting rod is fixedly connected with an output shaft of the motor; the clamping module comprises a plurality of clamping components, the clamping components are sequentially and movably arranged on the second guide rail, a second connecting block is fixedly connected to one side end face, close to the motor, of each clamping component, a plurality of middle bearing components are fixedly arranged between the second connecting blocks, hinge rod components are movably connected to two sides of each second connecting block, connecting plates are fixedly connected to two sides of the clamping module respectively, and the connecting plates are fixedly connected with the top ends of the supporting blocks.

2. A planar film stretching apparatus as claimed in claim 1, wherein said first guide rail has a guide slot formed on a side wall thereof adjacent to said first connecting rod, said first connecting rod and said second connecting rod are hinged by a first roller, and a center line of a rotation shaft of said first roller is kept collinear with a center line of a hinge rotation shaft of said first connecting rod and said second connecting rod, said first roller rolls along said guide slot.

3. The film planar stretching device as claimed in claim 2, wherein said holding assembly comprises a holding block, said holding block having a holding handle movably disposed on the top thereof, said holding handle being rotated to firmly hold the film, said holding block having 2 sets of second rollers rotatably disposed on the bottom thereof, said 2 sets of second rollers being symmetrically disposed on two sides of said second rail and being capable of rolling along two side surfaces of said second rail.

4. The planar film stretching device as claimed in claim 3, wherein the first rotary columns are respectively fixedly disposed on two sides of the second connecting block, and a threaded hole is disposed in the center of an end surface of one side of the second connecting block, which is far away from the clamping block.

5. The film planar stretching device as claimed in claim 4, wherein the middle bearing assembly comprises a middle bearing shell, a sliding groove is formed in the middle bearing shell, a separation baffle is tightly arranged in the middle of the sliding groove, springs are tightly connected to two sides of the separation baffle, sliding columns are tightly connected to two sides of the springs, the sliding columns are slidably connected to the middle bearing shell, threads are arranged on the surfaces of the sliding columns, one ends of the sliding columns, far away from the middle bearing shell, are respectively and tightly connected to threaded holes of the corresponding second connecting blocks, and when the springs are not elastically deformed, the planar stretching unit is in an initial position.

6. The film planar stretching device as claimed in claim 1, wherein the hinge assembly comprises two circular plates, a second rotating column is rotatably connected between the two circular plates, rotating column baffles are fixedly connected to two ends of the second rotating column, square hinge columns are symmetrically and fixedly connected to the side walls of the circular plates, the thickness of each hinge column is larger than that of the corresponding circular plate, the two circular plates are tightly attached to each other, rotating shaft sleeves are fixedly connected to two ends of each hinge column, and the rotating shaft sleeves are connected with the first rotating columns in a sleeved mode.

7. A planar film stretching apparatus as claimed in claim 1, wherein said second guide comprises two symmetrically disposed guides, each of said second guides has 5 holding members, and 4 hinge rod members are disposed between 5 holding members.

8. The film planar stretching device as claimed in claim 1, wherein the center of the first connecting rod is tightly connected with the output shaft of the motor, the length of the first connecting rod is greater than or equal to 2 times of the length of the second connecting rod, the thickness of the first connecting rod is greater than or equal to 2 times of the thickness of the second connecting rod, the included angle between the initial positions of the first connecting rod and the second connecting rod is 120 degrees, the number of the second connecting rods is two, and the two second connecting rods are kept parallel.

9. The film plane stretching device as claimed in claim 1, wherein a first fixing block is fastened to two ends of the first slide rail, a second fixing block is fastened to two ends of the second slide rail, the first fixing block and the second fixing block are electrically connected to a controller, and when the first slide block contacts the first fixing block or the second slide block contacts the second fixing block, the controller controls the motor to change the direction of rotation.

10. A film planar stretching apparatus as claimed in claim 1, wherein said film conveying unit comprises a first upstream roller, a second upstream roller, a first downstream roller and a second downstream roller which are arranged in this order in the conveying direction.