Film preheating mechanism in film longitudinal stretching machine

Abstract

The utility model discloses a film preheating mechanism in a longitudinal film stretcher, which comprises a frame, a roller seat and a preheating part, and a guide roller I, a guide roller II, a guide roller III and a guide roller IV are rotatably supported on the roller seat. A film moved out of the feeding roller group is received by the stretching roller group after bypassing the guide roller I, the guide roller II, the guide roller III and the guide roller IV in sequence; the first heating piece is located over the film, and the heating end of the first heating piece can directly face the film. The two sides of the thin film are each provided with a second heating piece, and the heating ends of the two second heating pieces directly face the thin film. In the process that a film is transferred from the feeding roller set to the stretching roller set, the first heating piece and the second heating piece can heat the film in a non-contact mode, and it is guaranteed that the film can be evenly and fully heated through the design.

Description

Technical Field

[0001] The utility model relates to the field of plastic film processing equipment, and more specifically to a film preheating mechanism in a film longitudinal stretching machine. Background Art

[0002] The longitudinal film stretching machine is one of the key equipment for preparing plastic films. It improves the mechanical properties and transparency of the film by longitudinal stretching.

[0003] The longitudinal stretching of the film involves feeding, preheating system, stretching, cooling and winding. The existing longitudinal stretching machine uses a preheating roller in the preheating process. The two ends of the preheating roller are respectively provided with a heat medium outlet and a heat medium inlet. A film is wound around the preheating roller. During the transportation of the film, the heated preheating roller will heat up and preheat the film. The above design still has shortcomings. On the one hand, the heat medium flows from one end of the preheating roller to the other end. During this process, the temperature of the area of ​​the preheating roller close to the heat medium inlet is high, and the temperature of the area close to the heat medium outlet is low, which will cause uneven heating of the film. On the other hand, in order to ensure the preheating effect, multiple preheating rollers need to be designed, and the film needs to pass through multiple preheating rollers. When the number of preheating rollers is too large, the probability of surface damage of the film due to impurities or defects on the outer wall of the preheating roller will increase significantly. At the same time, the number of preheating rollers is large and it is inconvenient to disassemble and assemble, and it takes a long time to perform maintenance, which affects the work efficiency.

[0004] Therefore, how to provide a film preheating mechanism in a film longitudinal stretching machine so that it can overcome the above problems is an issue that those skilled in the art urgently need to solve. Utility Model Content

[0005] In view of this, the utility model provides a film preheating mechanism in a film longitudinal stretching machine.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A film preheating mechanism in a film longitudinal stretching machine, located between a stretching roller group and a feed roller group, comprises:

[0008] frame;

[0009] A roller seat, the roller seat is installed below the frame, and the roller seat rotatably supports guide rollers 1, 2, 3 and 4 which are parallel to each other and arranged in sequence along the length direction of the frame, the film removed from the feed roller group is received by the stretching roller group after passing through the guide rollers 1, 2, 3 and 4 in sequence, the guide rollers 1 and 4 are both located below the guide roller 2, and the guide roller 3 is located above the guide roller 2;

[0010] A preheating element, the preheating element includes a heating element 1 and a heating element 2 both mounted on the frame, the heating element 1 can be arranged between the guide roller 2 and the guide roller 3, the heating element 1 is located above the film, the heating end of the heating element 1 can be aligned with the film, and a gap is provided between the heating end of the heating element 1 and the film; two heating elements 2 are provided, the heating ends of the two heating elements 2 are arranged opposite to each other, the film located between the guide roller 3 and the guide roller 4 is arranged between the two heating ends of the heating element 2, and a gap is provided between the heating end of the heating element 2 and the film.

[0011] It can be known from the above technical scheme that, compared with the prior art, the utility model discloses a film preheating mechanism in a film longitudinal stretching machine. In the process of transferring the film from the feed roller group to the stretching roller group, the film in the utility model can be reliably wound on guide roller one, guide roller two, guide roller three and guide roller four, and heating element one and heating element two can perform non-contact heating on the film. On the one hand, the above design ensures that the film can be heated evenly and sufficiently. On the other hand, since only guide roller one, guide roller two, guide roller three and guide roller four are in contact with the film in the preheating mechanism, the probability of damage to the film surface due to contamination or defects on the outer wall of guide roller one, guide roller two, guide roller three and guide roller four is very small.

[0012] Preferably, it further comprises a moving part, the moving part comprises a guide rail, a slider 1, a slider 2, a mounting frame 1 and a mounting frame 2, the guide rail is fixed on the frame, the length direction of the guide rail is the same as the length direction of the frame, the slider 1 and the slider 2 are both slidably mounted on the guide rail, the mounting frame 1 is fixed to the slider 1, the mounting frame 2 is fixed to the slider 2, the heating element 1 and one of the heating elements 2 are fixed on the mounting frame 1, and another of the heating elements 2 is fixed on the mounting frame 2. The heating element 1 and the heating element 2 can be moved, so as to facilitate the disassembly and assembly of the heating element 1, the heating element 2 and the film.

[0013] Preferably, the moving part further includes rack 1, rack 2, driving machine 1, gear 1, driving machine 2 and gear 2, the rack 1 and the rack 2 are both fixed on the frame, the length direction of the rack 1 and the length direction of the rack 2 are both the same as the rail length direction of the guide rail; the driving machine 1 is fixed to the mounting frame 1, the gear 1 is coaxially fixed with the output shaft of the driving machine 1, and the gear 1 is meshed with the rack 1; the driving machine 2 is fixed to the mounting frame 2, the gear 2 is coaxially fixed with the output shaft of the driving machine 2, and the gear 2 is meshed with the rack 2. The driving machine 1 and the driving machine 2 can reliably drive the heating element 1 and the heating element 2 to move.

[0014] Preferably, the heating element 1 includes a rectangular shell 1 and an infrared heating tube 1, the rectangular shell 1 is fixed to the mounting frame 1, and one side of the rectangular shell 1 is open, and the open side of the rectangular shell 1 can be parallel to the film located between the guide roller 2 and the guide roller 3, the open side of the rectangular shell 1 is directly opposite to the film position and there is a gap between the two, and the length direction of the rectangular shell 1 is perpendicular to the length direction of the frame; a plurality of infrared heating tubes 1 are provided and are all fixed inside the rectangular shell 1, and the plurality of infrared heating tubes 1 are arranged equidistantly in sequence along the width direction of the rectangular shell, and the heating temperatures of the plurality of infrared heating tubes 1 become larger in sequence, and the heating temperatures of the plurality of infrared heating tubes 1 become larger closer to the guide rollers 2 and 3. The heating temperature of the infrared heating tube 1 of roller 2 is lower than the heating temperature of the infrared heating tube 1 near the guide roller 3; the heating element 2 includes a rectangular shell 2 and an infrared heating tube 2, the rectangular shell 2 is fixed to the mounting frame 2, one side of the rectangular shell 2 is open, the open side of the rectangular shell 2 is directly opposite to the film position between the guide roller 3 and the guide roller 4 and there is a gap between the two, and the length direction of the rectangular shell 2 is perpendicular to the length direction of the frame; the infrared heating tube 2 is provided with a plurality of them and all are fixed inside the rectangular shell 2, the plurality of infrared heating tubes 2 are arranged in sequence and equidistantly along the vertical direction, and the heating temperature of the plurality of infrared heating tubes 2 is the same. The heating element 1 and the heating element 2 can reliably heat the film.

[0015] Preferably, the length of the rectangular shell 1 and the length of the rectangular shell 2 are both greater than the width of the film. The heating element 1 and the heating element 2 can evenly and fully heat the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0017] Figure 1 It is an overall axonometric view of a film preheating mechanism in a film longitudinal stretching machine;

[0018] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0019] Figure 3 yes Figure 1 A partial enlarged view of point B in the middle;

[0020] Figure 4It is a front view of a film preheating mechanism in a film longitudinal stretching machine;

[0021] Figure 5 This is a partial axonometric view of a film preheating mechanism in a film longitudinal stretching machine. Figure 1 ;

[0022] Figure 6 This is a partial axonometric view of a film preheating mechanism in a film longitudinal stretching machine. Figure 2 .

[0023] In the figure:

[0024] 1 is a film, 2 is a frame, 3 is a roller seat, 4 is a guide roller 1, 5 is a guide roller 2, 6 is a guide roller 3, 7 is a guide roller 4, 8 is a rectangular shell 1, 9 is an infrared heating tube 1, 10 is a rectangular shell 2, 11 is an infrared heating tube 2, 12 is a guide rail, 13 is a slider 1, 14 is a slider 2, 15 is a mounting frame 1, 16 is a mounting frame 2, 17 is a rack 1, 18 is a rack 2, 19 is a driving machine 1, 20 is a gear 1, 21 is a driving machine 2, and 22 is a gear 2. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The utility model discloses a film preheating mechanism in a film longitudinal stretching machine. In the process of transferring the film 1 from the feed roller group to the stretching roller group, the film 1 in the utility model can be reliably wound on the guide roller 1 4, the guide roller 2 5, the guide roller 3 6 and the guide roller 4 7. The heating element 1 and the heating element 2 can perform non-contact heating on the film 1. On the one hand, the above design ensures that the film 1 can be heated evenly and fully; on the other hand, since only the guide roller 1 4, the guide roller 2 5, the guide roller 3 6 and the guide roller 4 7 in the preheating mechanism are in contact with the film 1, the probability of the surface of the film 1 being damaged due to contamination or defects on the outer side walls of the guide roller 1 4, the guide roller 2 5, the guide roller 3 6 and the guide roller 4 7 is very small.

[0027] By designing the moving parts, the driving machine 19 and the driving machine 21 can reliably drive the mounting frame 15 and the mounting frame 2 16 to move, thereby realizing the movement of the heating element 1 and the heating element 2. The heating element 1 can be away from the film 1 located between the guide roller 2 5 and the guide roller 3 6, that is, the heating element 1 can not be between the guide roller 2 5 and the guide roller 3 6; the two heating elements 2 can be away from the film 1 located between the guide roller 3 6 and the guide roller 4 7, that is, the two heating elements are away from each other. On the one hand, the above design facilitates the disassembly and assembly of the film 1 wound around the guide roller 1 4, the guide roller 2 5, the guide roller 3 6 and the guide roller 4 7. On the other hand, the design also facilitates the disassembly and assembly and maintenance of the guide roller 1 4, the guide roller 2 5, the guide roller 3 6, the guide roller 4 7, the heating element 1 and the heating element 2.

[0028] Example

[0029] See attached Figure 1-6 The utility model is a schematic diagram of the overall and partial structures of an embodiment of the utility model. The utility model specifically discloses a film preheating mechanism in a film longitudinal stretching machine, which is located between a stretching roller group and a feed roller group to preheat a film 1 to be stretched. The preheating mechanism includes:

[0030] Frame 2, the length direction of the frame 2 is the same as the moving direction of the film 1;

[0031] A roller seat 3, the roller seat 3 is installed below the frame 2, and the roller seat 3 rotatably supports a guide roller 1 4, a guide roller 2 5, a guide roller 3 6, and a guide roller 4 7 which are parallel to each other and arranged in sequence along the length direction of the frame 2, the axis center line of the guide roller 1 4, the axis center line of the guide roller 2 5, the axis center line of the guide roller 3 6, and the axis center line of the guide roller 4 7 are all the same as the width direction of the frame 2, and the length of the guide roller 1 4, the length of the guide roller 2 5, the length of the guide roller 3 6, and the length of the guide roller 4 7 are all greater than the width of the film 1; the outer diameters of the guide roller 1 4, the outer diameters of the guide roller 2 5, the outer diameters of the guide roller 3 6, and the outer diameters of the guide roller 4 7 are all the same;

[0032] The film 1 removed from the feed roller group is received by the stretching roller group after passing through the guide roller 1 4, the guide roller 2 5, the guide roller 3 6 and the guide roller 4 7 in sequence; the guide roller 1 4 and the guide roller 4 7 are both located below the guide roller 2 5, and the axis of the guide roller 1 4 and the axis of the guide roller 4 7 can jointly define a horizontal plane, and the guide roller 3 6 is located above the guide roller 2 5;

[0033] The preheating element includes a heating element 1 and a heating element 2 both mounted on the frame 2. The heating element 1 can be arranged between the guide roller 2 5 and the guide roller 3 6. The heating element 1 is located above the film 1. The heating end of the heating element 1 can be aligned with the film 1. There is a gap between the heating end of the heating element 1 and the film 1. Two heating elements 2 are provided. The heating ends of the two heating elements 2 are arranged opposite to each other. The film 1 located between the guide roller 3 6 and the guide roller 4 7 is arranged between the heating ends of the two heating elements 2. There is a gap between the heating end of the heating element 2 and the film 1. The heating element 1 and the heating element 2 can perform non-contact heating on both sides of the film 1.

[0034] More specifically, it also includes a moving part, which includes a guide rail 12, a slider 13, a slider 2 14, a mounting frame 15 and a mounting frame 2 16. The guide rail 12 is fixed on the frame 2, and the guide rail 12 is located above the guide roller 3 6; in this embodiment, the guide rail 12 is provided with two groups, each group has two guide rails 12, and the two groups of guide rails 12 are arranged near the two ends of the guide roller 4, and the length direction of the guide rail 12 is the same as the length direction of the frame 2, and each guide rail 12 is slidably mounted with a slider 13 and a slider 2 14, and the slider 13 and the slider 2 14 are both located above the guide rail 12. In this embodiment, there are two mounting frames 15 and mounting frames 16, and the two mounting frames 15 are fixed to a heating element 1 and a heating element 2 at the same time, and the two mounting frames 2 16 are fixed to another heating element 2 at the same time, and each mounting frame 15 is fixed with a slider 13, and each mounting frame 2 14 is fixed with a slider 2;

[0035] When the slider 13 moves on the guide rail 12, it can drive the heating element 1 and the heating element 2 to move; one of the purposes of designing the moving parts is to facilitate the disassembly and assembly of the film 1 on the guide roller 1 4, the guide roller 2 5, the guide roller 3 6 and the guide roller 4 7.

[0036] More specifically, the moving parts also include a rack 17, a rack 2 18, a driving machine 19, a gear 1 20, a driving machine 21 and a gear 22. In this embodiment, two racks 17 and two racks 18 are provided, and the two racks 17 are arranged close to both ends of the guide roller 4, and the two racks 2 18 are arranged close to both ends of the guide roller 4. The racks 17 and the racks 2 18 are fixed to the frame 2, and the length direction of the racks 17 and the racks 2 18 are the same as the rail length direction of the guide rail 12; each mounting frame 15 is fixed with a driving machine 19, and the gear 20 is fixed coaxially with the output shaft of the driving machine 19. The gear 20 is meshed with the rack 17, and the driving machine 19 drives the gear 20 to rotate, and the gear 20 rotates to drive the mounting frame 15 to move; each mounting frame 16 is fixed with a driving machine 21, and the gear 22 is coaxially fixed with the output shaft of the driving machine 21, and the gear 22 is meshed with the rack 218. The driving machine 21 drives the gear 22 to rotate, and the gear 22 rotates to drive the mounting frame 16 to move; the driving machine 19 and the driving machine 21 are both servo motors, and the moving strokes of the mounting frames 15 and 16 depend on the number of rotations of the output shaft of the driving machine 19 and the output shaft of the driving machine 21.

[0037] The heating element 1 includes a rectangular shell 18 and an infrared heating tube 19; the rectangular shell 18 is fixed to the mounting frame 15, and one side of the rectangular shell 18 is open, and the open side of the rectangular shell 18 can be parallel to the film 1 located between the guide roller 25 and the guide roller 36, and the open side of the rectangular shell 18 is directly opposite to the film 1 and there is a gap between the two, and the length direction of the rectangular shell 18 is perpendicular to the length direction of the frame 2; a plurality of infrared heating tubes 9 are provided and are all fixed inside the rectangular shell 18, and the plurality of infrared heating tubes 9 are arranged equidistantly in sequence along the width direction of the rectangular shell, and the heating temperatures of the plurality of infrared heating tubes 9 increase in sequence, and the heating temperature of the infrared heating tube 19 close to the guide roller 25 is lower than the heating temperature of the infrared heating tube 19 close to the guide roller 36, that is, the film 1 will have a gradual heating process when passing through the heating element 1;

[0038] The heating element 2 includes a rectangular shell 2 10 and an infrared heating tube 2 11; the rectangular shell 2 10 is fixed to the mounting frame 2 16, and one side of the rectangular shell 2 10 is open. The open side of the rectangular shell 2 10 is directly opposite to the film 1 located between the guide roller 3 6 and the guide roller 4 7 and there is a gap between the two. The length direction of the rectangular shell 2 10 is perpendicular to the length direction of the frame 2; a plurality of infrared heating tubes 2 11 are provided and are all fixed inside the rectangular shell 2 10, and the plurality of infrared heating tubes 2 11 are arranged equidistantly in sequence along the vertical direction, and the heating temperatures of the plurality of infrared heating tubes 2 11 are the same.

[0039] The length of the rectangular shell 1 8 and the length of the rectangular shell 2 10 are both greater than the width of the film 1 , ensuring that the film 1 can be fully heated.

[0040] The temperature of the infrared heating tube 1 9 and the infrared heating tube 2 11 is adjusted by controlling the input power of the infrared heating tube 1 9 and the infrared heating tube 2 11 .

[0041] The film 1 removed from the feed roller group is received by the stretching roller group after passing through the guide roller 1 4, the guide roller 2 5, the guide roller 3 6 and the guide roller 4 7 in sequence. When the film 1 passes through the heating element 1, the heating element 1 will gradually heat up the film 1. When the film 1 passes through the heating element 2, the heating element 2 will evenly heat up the film 1 to ensure that the film 1 can be effectively preheated when it is about to be stretched, which is helpful for the subsequent stretching effect.

[0042] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A film preheating mechanism in a film longitudinal stretching machine, located between a stretching roller group and a feed roller group, characterized in that: include: Rack (2); A roller seat (3), the roller seat (3) being installed below the frame (2), the roller seat (3) being rotatably supported with a guide roller 1 (4), a guide roller 2 (5), a guide roller 3 (6) and a guide roller 4 (7) which are parallel to each other and arranged in sequence along the length direction of the frame (2), the film (1) removed from the feed roller group is received by the stretching roller group after passing through the guide roller 1 (4), the guide roller 2 (5), the guide roller 3 (6) and the guide roller 4 (7) in sequence, the guide roller 1 (4) and the guide roller 4 (7) are both located below the guide roller 2 (5), and the guide roller 3 (6) is located above the guide roller 2 (5); A preheating element, the preheating element comprising a heating element 1 and a heating element 2 both mounted on the frame (2), the heating element 1 being arranged between the guide roller 2 (5) and the guide roller 3 (6), the heating element 1 being located above the film (1), the heating end of the heating element 1 being arranged to be aligned with the film (1), and a gap being provided between the heating end of the heating element 1 and the film (1); two heating elements 2 are provided, the heating ends of the two heating elements 2 being arranged opposite to each other, the film (1) being located between the guide roller 3 (6) and the guide roller 4 (7) being arranged between the heating ends of the two heating elements 2, and a gap being provided between the heating end of the heating element 2 and the film (1).

2. The film preheating mechanism in a film longitudinal stretching machine according to claim 1, characterized in that: The invention also comprises a moving part, wherein the moving part comprises a guide rail (12), a slider 1 (13), a slider 2 (14), a mounting frame 1 (15) and a mounting frame 2 (16); the guide rail (12) is fixed on the frame (2); the length direction of the guide rail (12) is the same as the length direction of the frame (2); the slider 1 (13) and the slider 2 (14) are both slidably mounted on the guide rail (12); the mounting frame 1 (15) is fixed to the slider 1 (13); the mounting frame 2 (16) is fixed to the slider 2 (14); the heating element 1 and one of the heating elements 2 are fixed on the mounting frame 1 (15); and the other of the heating elements 2 is fixed on the mounting frame 2 (16).

3. The film preheating mechanism in a film longitudinal stretching machine according to claim 2, characterized in that: The movable part also includes a rack bar 1 (17), a rack bar 2 (18), a driving machine 1 (19), a gear bar 1 (20), a driving machine 2 (21) and a gear bar 2 (22); the rack bar 1 (17) and the rack bar 2 (18) are both fixed on the frame (2); the length direction of the rack bar 1 (17) and the length direction of the rack bar 2 (18) are both the same as the rail length direction of the guide rail (12); the driving machine 1 (19) is fixed to the mounting frame 1 (15); the gear bar 1 (20) is coaxially fixed to the output shaft of the driving machine 1 (19); the gear bar 1 (20) is meshed with the rack bar 1 (17); the driving machine 2 (21) is fixed to the mounting frame 2 (16); the gear bar 2 (22) is coaxially fixed to the output shaft of the driving machine 2 (21); the gear bar 2 (22) is meshed with the rack bar 2 (18).

4. The film preheating mechanism in a film longitudinal stretching machine according to claim 2, characterized in that: The heating element 1 comprises a rectangular shell 1 (8) and an infrared heating tube 1 (9), the rectangular shell 1 (8) being fixed to the mounting frame 1 (15), and one side of the rectangular shell 1 (8) being open, and the open side of the rectangular shell 1 (8) being able to be parallel to the film (1) located between the guide roller 2 (5) and the guide roller 3 (6), and the open side of the rectangular shell 1 (8) being directly opposite to the film (1) and having a gap therebetween, and the length direction of the rectangular shell 1 (8) being perpendicular to the length direction of the frame (2); a plurality of infrared heating tubes 1 (9) being provided and all being fixed inside the rectangular shell 1 (8), and the plurality of infrared heating tubes 1 (9) being arranged equidistantly in sequence along the width direction of the rectangular shell, and the heating temperatures of the plurality of infrared heating tubes 1 (9) becoming larger in sequence, and the infrared heating tubes 1 (9) being closer to the guide roller 2 (5) becoming larger in sequence. The heating temperature of the infrared heating tube (9) is lower than the heating temperature of the infrared heating tube (9) near the guide roller (6); the heating element (2) comprises a rectangular shell (10) and an infrared heating tube (11); the rectangular shell (10) is fixed to the mounting frame (16); one side of the rectangular shell (10) is open; the open side of the rectangular shell (10) is directly opposite to the film (1) between the guide roller (6) and the guide roller (7) and there is a gap between the two; the length direction of the rectangular shell (10) is perpendicular to the length direction of the frame (2); a plurality of infrared heating tubes (11) are provided and are all fixed inside the rectangular shell (10); the plurality of infrared heating tubes (11) are arranged in sequence and equidistantly along the vertical direction; the heating temperatures of the plurality of infrared heating tubes (11) are the same.

5. The film preheating mechanism in a film longitudinal stretching machine according to claim 4, characterized in that: The length of the rectangular shell one (8) and the length of the rectangular shell two (10) are both greater than the width of the film (1).

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