A film transverse stretching device

Abstract

The present invention discloses a film transverse stretching device, comprising an oven, a first chain rail system and a second chain rail system, wherein the first chain rail system forms a closed-loop track around one side of the oven inlet and outlet; the second chain rail system forms a closed-loop track around the other side of the oven inlet and outlet, and the spacing between the first chain rail system and the second chain rail system in the oven is adjustable; the first chain rail system and the second chain rail system are respectively provided with an outlet turntable assembly on the outside of the oven outlet, and the outlet turntable assembly is used to drive the corresponding chain clips on the first chain rail system and the second chain rail system to move synchronously. In the present invention, the first chain rail system and the second chain rail system are independently controlled and adjusted by the corresponding outlet turntable assembly, replacing the traditional structure of mechanical synchronous transmission of a single motor through a universal coupling. The outlet turntable assembly can drive the corresponding chain clips on the first chain rail system and the second chain rail system to move synchronously, taking up little space, having fewer transmission structures, and having a low mechanical failure rate.

Description

Technical Field

[0001] The present invention relates to the technical field of film production, in particular to a film transverse stretching device. Background Art

[0002] The transverse stretching machine is an essential component in biaxial film stretching equipment. Its function is to clamp the film's ends with evenly spaced chain clips on the track, stretching the film perpendicular to the film's path by changing the track path. Simultaneously, a closed oven structure is used to heat the film in a circular motion, causing the plastic molecules to enter a highly elastic state, thereby changing the width of the product and improving its mechanical properties. To ensure synchronous adjustment between the operating and power sides, the traditional chain track system's inlet and outlet typically utilizes a single motor with a universal coupling for mechanical synchronous transmission. This results in a very large and complex structure for the inlet and outlet turntables, resulting in large floor space requirements, a high rate of mechanical failure, difficulty in manufacturing, and high costs. Summary of the Invention

[0003] The purpose of this application is to provide a film transverse stretching device to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] A film transverse stretching device, comprising an oven, one end of the oven being an inlet and the other end of the oven being an outlet, and further comprising:

[0006] a first chain track system, the first chain track system forming a closed loop track around one side of the oven inlet and outlet;

[0007] a second chain track system, the second chain track system forming a closed-loop track around the other side of the oven inlet and outlet, and the spacing between the first chain track system and the second chain track system in the oven is adjustable;

[0008] The first chain rail system and the second chain rail system are respectively provided with an outlet turntable assembly on the outer side of the outlet of the oven. The two outlet turntable assemblies move synchronously, and the outlet turntable assembly is used to drive the corresponding chain clips on the first chain rail system and the second chain rail system to move synchronously.

[0009] Furthermore, the first chain rail system and the second chain rail system both include a first inner chain rail and a second inner chain rail arranged inside the oven, and the first inner chain rail and the second inner chain rail both include a plurality of hinge base plates, one side of the hinge base plate is connected to the track beam A, and the other side of the hinge base plate is connected to the track beam B through a slider connecting rod mechanism, and the track beam A and the track beam B are both used to install chain clips; an adjustment mechanism is correspondingly provided for a pair of opposite hinge base plates on the first inner chain rail and the second inner chain rail.

[0010] Furthermore, the slider-link mechanism includes a connecting rod, both ends of which are rotatably connected to the hinge base plate and the track beam B through fixed seats, and one end of the track beam B close to the hinge base plate is slidably connected to the hinge base plate.

[0011] Furthermore, the adjustment mechanism includes a first adjusting motor, a screw and a screw nut. The motor shaft of the first adjusting motor is connected to the screw, and the screw is rotatably connected in the oven. The screw is symmetrically provided with two sections of positive threads and negative threads with opposite rotation directions. The positive threads and negative threads are respectively provided with the screw nuts. The screw nut is provided with an adjusting rod, and the adjusting rod is connected to the hinge base plate.

[0012] Furthermore, a first sliding groove is provided on the hinge base plate, and the adjusting rod is installed in the first sliding groove.

[0013] Furthermore, one end of the screw rod away from the motor is connected to a counter and a mechanical digital position indicator through a belt transmission mechanism.

[0014] Furthermore, the end of the screw rod away from the motor is connected to a handwheel.

[0015] Furthermore, the outlet turntable assembly includes a first movable platform, a servo motor, a reduction gearbox and a driving sprocket. The movable end of the first movable platform is connected to the reduction gearbox. The servo motor drives the driving sprocket to rotate through the reduction gearbox. The first movable platform is used to drive the reduction gearbox to move in a direction perpendicular to the outlet of the oven.

[0016] Furthermore, the first chain rail system and the second chain rail system are provided with an entrance turntable assembly on the outside of the entrance of the oven, and the entrance turntable assembly includes a second movable platform and a sprocket turntable. The chain clip passes around the sprocket turntable, and the second movable platform is used to drive the sprocket turntable to move in a direction perpendicular to the entrance of the oven. A guide rail perpendicular to the moving direction of the second movable platform is provided below the sprocket turntable, and the movable end of the second movable platform is provided with a slider slidably connected to the guide rail.

[0017] Furthermore, the first chain rail system and the second chain rail system are respectively provided with a chain tensioning mechanism near the outside of the entrance of the oven, and the chain tensioning mechanism includes a fixed frame, a movable track beam, a linear guide rail, an oil cylinder, a track plate A and a track plate B. The movable track beam is hoisted in the fixed frame through the linear guide rail, the fixed end of the oil cylinder is connected to the fixed frame, and the movable end of the oil cylinder is connected to the movable track beam. The track plate A is fixedly connected to the movable track beam, and the track plate B is fixedly connected to the fixed frame. The track plate A and the track plate B are plugged into each other.

[0018] In summary, the technical effects and advantages of the present invention are as follows:

[0019] 1. In the present invention, the first and second chain track systems, i.e., the power side and the operating side, are independently controlled and adjusted through corresponding exit turntable assemblies, replacing the traditional structure of mechanical synchronous transmission by a single motor through a universal coupling. The exit turntable assembly can drive the corresponding chain clips on the first and second chain track systems to move synchronously, thus occupying a small space, having fewer transmission structures, and having a low mechanical failure rate, thereby greatly reducing production costs.

[0020] 2. In the present invention, the track beam A, hinge base plate and track beam B of the first inner link rail and the second inner link rail are connected by a slider connecting rod mechanism, which has a simple structure of individual parts, low processing difficulty and easy precision control;

[0021] 3. In the present invention, the end of the screw rod away from the motor is connected to a counter and a mechanical digital position indicator through a belt transmission mechanism. By converting the screw rod lead and the transmission ratio, the position indicator reflects the position of the first inner chain rail and the second inner chain rail.

[0022] 4. In the present invention, the outlet turntable assembly includes a first movable platform, a servo motor, a reduction gearbox, and a driving sprocket. The first movable platform can adjust the position of the reduction gearbox and the driving sprocket perpendicular to the direction of the oven outlet, thereby adjusting the width of the outlet. The two servo motors drive the corresponding driving sprockets to rotate. The servo motors are easy to control to achieve high-precision synchronous adjustment.

[0023] 5. In the present invention, the sprocket turntable of the inlet turntable assembly is an unpowered driven sprocket that only serves as a guide. The second movable platform can drive the sprocket turntable to move in the vertical direction of the oven inlet to achieve the purpose of adjusting the inlet width. The sprocket turntable is slidably connected to the movable end of the second movable platform through a guide rail and a slider, and the sprocket turntable can move freely to compensate for the difference.

[0024] 6. In the present invention, the oil cylinder of the chain tensioning mechanism is pushed out with a set pressure, which is transmitted to the track plate through the movable track beam. Then, the relative distance between the movable track beam and the fixed frame increases, so that the chain clip is in a tensioned state as a whole. At the same time, during the tensioning process, the plug-in structure between the track plate A and the track plate B is utilized to ensure that the chain clip can still run smoothly when the length of the entire track plate changes. Compared with the traditional chain track system, which is mostly tensioned by the overall movement of the entrance turntable assembly and the exit turntable assembly, the tensioning is achieved by increasing the distance between the entrance and exit turntables. The chain tensioning mechanism of the present invention is hidden inside the track and appears more compact. The thrust utilization rate of the oil cylinder is high, which is a more economical choice. At the same time, compared with the complex tensioning structure of the entrance and exit that moves as a whole, this structure is easier to maintain and disassemble and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a structural diagram of a traditional hinge structure chain track;

[0027] Figure 2 Schematic diagram of the structure of a film transverse stretching device in one embodiment of the present invention Figure 1 ;

[0028] Figure 3 Schematic diagram of the structure of a film transverse stretching device in one embodiment of the present invention Figure 2 ;

[0029] Figure 4 2 is a schematic structural diagram of the second inner chain rail in one embodiment of the present invention;

[0030] Figure 5 for Figure 3 AA section view in;

[0031] Figure 6 The structure of the outlet turntable assembly in one embodiment of the present invention is shown in FIG. Figure 1 ;

[0032] Figure 7 The structure of the outlet turntable assembly in one embodiment of the present invention is shown in FIG. Figure 2 ;

[0033] Figure 8 This is a schematic structural diagram of an inlet turntable assembly in one embodiment of the present invention;

[0034] Figure 9 Schematic diagram of the movement of the outlet turntable assembly and the inlet turntable assembly in one embodiment of the present invention;

[0035] Figure 10 Schematic diagram of the installation position of the chain tensioning mechanism in one embodiment of the present invention;

[0036] Figure 11 A schematic diagram of the structure of a chain tensioning mechanism in one embodiment of the present invention Figure 1 ;

[0037] Figure 12 A schematic diagram of the structure of a chain tensioning mechanism in one embodiment of the present invention Figure 2 .

[0038] Figure: 1. Oven; 2. Outlet turntable assembly; 3. Chain clip; 4. First inner chain rail; 5. Second inner chain rail; 6. Adjustment mechanism; 7. First outer chain rail; 8. Second outer chain rail; 9. Inlet turntable assembly; 10. Chain tensioning mechanism; 21. Servo motor; 22. Reducer; 23. Drive sprocket; 24. Bearing seat; 25. Mounting base; 26. Linear guide; 27. First bottom frame; 28. Ball screw; 29. ​​Second adjustment motor; 51. Hinge base; 52. Track beam A; 53. Track Beam B; 54. Connecting rod; 55. Fixed seat; 56. Sliding pin; 57. Fixed pin; 511. First slide groove; 61. First adjusting motor; 62. Screw rod; 63. Screw nut; 64. Belt transmission mechanism; 65. Position indicator; 66. Handwheel; 67. Adjusting rod; 91. Sprocket turntable; 92. Guide rail; 93. Third adjusting motor; 101. Fixed frame; 102. Movable track beam; 103. Linear guide rail; 104. Cylinder; 105. Track plate A; 106. Track plate B. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] In order to solve the problems in the prior art, an embodiment of the present invention provides a film transverse stretching device, such as Figure 2-12 As shown, it includes an oven 1, a first chain rail system, and a second chain rail system. One end of the oven 1 is the entrance, and the other end of the oven 1 is the exit. The first chain rail system forms a closed-loop track around one side of the entrance and exit of the oven 1; the first chain rail system is located on the operating side. The second chain rail system forms a closed-loop track around the other side of the entrance and exit of the oven 1; the second chain rail system is located on the power side; the spacing between the first and second chain rail systems in the oven 1 is adjustable; the first and second chain rail systems are respectively provided with an exit turntable assembly 2 on the outside of the exit of the oven 1, and the two exit turntable assemblies 2 move synchronously, and the exit turntable assembly 2 is used to drive the corresponding chain clips 3 on the first and second chain rail systems to move synchronously.

[0044] In this embodiment, the first chain rail system and the second chain rail system, i.e., the power side and the operating side, are independently controlled and adjusted through the corresponding export turntable assembly 2, replacing the traditional structure of mechanical synchronous transmission of a single motor through a universal joint. The export turntable assembly 2 can drive the corresponding chain clips 3 on the first chain rail system and the second chain rail system to move synchronously, occupying a small space, with fewer transmission structures and a low mechanical failure rate, which greatly reduces the production cost.

[0045] Furthermore, the first and second chain rail systems each include a first inner chain rail 4 and a second inner chain rail 5 disposed within the oven 1. The first and second inner chain rails 4 and 5 are each a structure composed of a plurality of track beam sections. The first and second inner chain rails 4 and 5 each include a plurality of hinged base plates 51. One side of the hinged base plate 51 is connected to the track beam A52, and the other side of the hinged base plate 51 is connected to the track beam B53 via a slider-link mechanism. Both the track beam A52 and the track beam B53 are used to mount the chain clip 3. Both the track beam A52 and the track beam B53 are provided with rails for the sliding mounting of the chain clip 3. An adjustment mechanism 6 is correspondingly provided for each opposing pair of hinged base plates 51 on the first and second inner chain rails 4 and 5. In this embodiment, the track beams A52, hinged base plates 51, and track beam B53 of the first and second inner chain rails 4 and 5 are connected by a slider-link mechanism. The individual parts have a simple structure, low processing difficulty, and easy precision control.

[0046] The chain track device of this embodiment is the core component of the transverse stretching device. It consists of a first chain track system on the operating side, a second chain track system on the power side, and an adjustment mechanism 6. It is responsible for forming a closed-loop track, so that independent chain clips 3 are tightly arranged on the track to form a chain-like structure. The chain clips 3 are driven to move by the power turntable at the outlet. The chain clips 3 clamp the film at the entrance, thereby driving the film through the oven 1 along the shape of the track. At the same time, the adjustment mechanism 6 is responsible for adjusting the shape of the track to achieve the adjustment of the film width. The first chain track system and the second chain track system also include a first outer chain track 7 and a second outer chain track 8 located outside the oven 1, respectively. The part of the track between the first outer chain track 7 and the second outer chain track 8 is a fixed section.

[0047] Furthermore, the slider-link mechanism includes a connecting rod 54 , both ends of which are rotatably connected to the hinge base plate 51 and the track beam B53 through a fixing seat 55 , and one end of the track beam B53 close to the hinge base plate 51 is slidably connected to the hinge base plate 51 through a sliding pin 56 .

[0048] Furthermore, the adjustment mechanism 6 includes a first adjustment motor 61, a screw rod 62 and a screw rod nut. The motor shaft of the first adjustment motor 61 is connected to the screw rod 62, and the screw rod 62 is rotatably connected to the oven 1. The screw rod 62 is symmetrically provided with two sections of positive threads and negative threads with opposite rotation directions. The positive threads and negative threads are respectively provided with screw nuts. The screw rod nut is provided with an adjustment rod 67, and the adjustment rod 67 is connected to the hinge base plate 51.

[0049] Furthermore, a first sliding groove 511 is provided on the hinge base plate 51 , and the adjustment rod 67 is installed in the first sliding groove 511 .

[0050] During adjustment, the first adjustment motor 61 drives the screw 62 to rotate, and the screw 62 is screwed into the screw nut, with the left and right screw nuts rotating in opposite directions. At the same time, the adjustment rod 67 in the adjustment mechanism 6 is installed in the first slide groove 511 of the hinge base plate 51, thereby driving the track beam A52 and the chain clip 3 installed thereon to move along with the adjustment mechanism 6. Since the chain clip 3 needs to move at high speed on the entire track, each independent track beam, such as track beam A52 and track beam B53, must be linked to achieve a smooth transition between the track plates between the track beams. Therefore, when track beam A52 and the hinge base plate 51 move, the angle between the two track beams will change. A slider-link mechanism is formed by the fixed seat 55, connecting rod 54, fixed pin 57 and sliding pin 56 to achieve the linkage between track beam A52 and track beam B53.

[0051] Furthermore, the end of the screw 62, away from the motor, is connected via a belt drive mechanism 64 to a counter and a mechanical digital position indicator 65. A handwheel 66 is also connected to the end of the screw 62, away from the motor. To meet process requirements and achieve precise track positioning, a counter and a mechanical digital position indicator 65 are installed on the other side of the first adjustment motor 61 of the adjustment mechanism 6. The screw 62 is connected to the mechanical digital position indicator 65 via a belt. By converting the lead of the screw 62 and the transmission ratio, the position indicator 65 reflects the track position. Fine adjustments can be made using the handwheel 66 according to process requirements.

[0052] In this embodiment, the outlet turntable assembly 2 and the inlet turntable assembly 9 are both independent structures on the operating side and the power side. Therefore, the outlet turntable assembly 2, the inlet turntable assembly 9, the first outer chain rail 7 and the first inner chain rail 4 on one side constitute an independent mechanism, and the outlet turntable assembly 2, the inlet turntable assembly 9, the second outer chain rail 8 and the second inner chain rail 5 on one side constitute an independent mechanism. Taking the second chain rail system on the power side as an example, the power end of the second chain rail system is designed in the outlet turntable assembly 2, and the servo motor 21 drives the driving sprocket 23 to rotate, which acts as the driving wheel to drive the entire chain clip 3 to move on the track. Furthermore, the outlet turntable assembly 2 includes a first moving platform, a servo motor 21, a reduction gear 22 and a driving sprocket 23. The moving end of the first moving platform is connected to the reduction gear 22. The servo motor 21 drives the driving sprocket 23 to rotate through the reduction gear 22. The first moving platform is used to drive the reduction gear 22 to move in a direction perpendicular to the outlet of the oven 1. The high-power servo motor 21 drives the chain clip 3 on the single-sided integral chain rail to move. Specifically, the reduction gearbox 22 is used as the main body, and the driving sprocket 23 is mounted on the output shaft of the reduction gearbox 22 via a bearing seat 24. The reduction gearbox 22 is fixed to the mounting base 25 and connected to the first base frame 27 via a linear guide 9226. The mounting base 25 is also connected to the ball screw 28 via a nut seat. The position of the driving sprocket 23 and the reduction gearbox 22 on the first base frame 27 is adjusted by the second adjustment motor 29.

[0053] Furthermore, the first and second chain rail systems are equipped with an entrance turntable assembly 9 outside the entrance of oven 1. This turntable assembly 9 includes a second movable platform and a sprocket turntable 91. The chain clip 3 passes around the sprocket turntable 91. The second movable platform is used to drive the sprocket turntable 91 in a direction perpendicular to the entrance of oven 1. Below the sprocket turntable 91, a guide rail 92 is provided perpendicular to the movement direction of the second movable platform. The movable end of the second movable platform is provided with a slider that is slidably connected to the guide rail 92. The sprocket turntable 91 is an unpowered driven sprocket that serves only as a guide. A third adjustment motor 93, via a nut seat and a ball screw, achieves X-axis motion (i.e., motion perpendicular to the entrance direction) to adjust the entrance width.

[0054] The chain track adjustment is a complex process that requires multi-point structural linkage and multi-motor coordinated operation. Overall, when adjusting the chain track, the inlet turntable assembly 9, the outlet turntable assembly 2 and the track adjustment mechanism 6 work simultaneously. The movement direction of each point is as follows Figure 3 As shown, the inlet and outlet widths are adjusted according to process requirements, and the distance between each track section inside the oven 1 is adjusted to create a suitable stretching ratio and retraction amount.

[0055] This embodiment innovatively designs a structure capable of XY two-axis motion under the entrance turntable assembly 9, and the entrance turntable assembly 9 includes four mutually perpendicular guide rails 92. The main purpose is to Figure 9 As shown, when the chain track is adjusted, the outlet may increase while the inlet decreases, depending on process requirements, to increase the stretch ratio. However, since the total length of the chain track is a fixed value—that is, the path between points A and B in the figure remains constant regardless of changes—when the outlet increases and the inlet decreases, point A tends to move toward point B. Therefore, a degree of freedom is added to the inlet turntable assembly 9: the X-axis (perpendicular to the inlet direction) is adjusted by servo motor 21, while the Y-axis (parallel to the inlet direction) moves freely based on chain track adjustment to compensate for the difference.

[0056] Furthermore, the first and second chain rail systems are each provided with a chain tensioning mechanism 10 near the outside of the entrance of the oven 1. The chain tensioning mechanism 10 comprises a fixed frame 101, a movable track beam 102, a linear guide 103, a cylinder 104, a track plate A 105, and a track plate B 106. The movable track beam 102 is hoisted within the fixed frame 101 via the linear guide 103. The fixed end of the cylinder 104 is connected to the fixed frame 101, and the movable end of the cylinder 104 is connected to the movable track beam 102. The track plate A 105 is fixedly connected to the movable track beam 102, and the track plate B 106 is fixedly connected to the fixed frame 101. The track plates A 105 and B 106 are plugged together. When the chain clips 3 are arranged in pairs to fill the entire track, they can be considered an extra-long chain. Therefore, like ordinary chains, the chain rails also need to be tensioned for smooth operation. The chain tensioning mechanism 10 of the chain rail system of this application is designed at the first outer chain rail 7 and the second outer chain rail 8 near the entrance end, and the position is as follows: Figure 10 As shown. The structure adopts the idea of ​​separate track beam, refer to Figure 11 and 12From the diagram, the movable track beam 102 is hoisted in the fixed frame 101 via a linear guide 103. The movement of the movable track beam 102 is controlled by the oil cylinder 104. At the same time, the track plate is split into two parts: track plate A105 is fixed to the movable track beam 102, and track plate B106 is fixed to the fixed frame 101. At the same time, a plug-in structure is designed at the parting of the track plates as shown in the figure, so that when track plates A105 and B106 move relative to each other, the chain clip 3 can still move smoothly on it without derailing. During operation, the oil cylinder 104 pushes out at a set pressure, which is transmitted to the track plate through the movable track beam 102. The plug-in structure between track plates A105 and B106 ensures that the chain clip can still run smoothly during the process of length change of the entire track plate.

[0057] Traditional track systems often use special-shaped rotating hinge structures between track beams, such as Figure 1 As shown, most parts require a casting process, which is difficult to manufacture and has poor structural stability. Furthermore, due to the extremely high temperature inside the oven 1, which can reach over 300°C, the thermal expansion effect caused by the oven 1 significantly affects the flexibility of the traditional hinge structure. In this embodiment, a slider-connecting rod mechanism is used between the track beams within the oven 1. This structure has a simple individual component structure, low manufacturing difficulty, and easy precision control. In this structure, the thermal expansion effect of each track beam caused by the oven 1 is transmitted to the entrance turntable assembly 9 via the connecting rod 54 and absorbed by the guide rail 92 at the bottom of the entrance turntable assembly 9.

[0058] To ensure synchronous adjustment between the operating and power sides, traditional chain track systems typically use a single motor with a universal joint for mechanical synchronization. This results in very large and complex turntables for both the entrance and exit, resulting in large footprints, high mechanical failure rates, and manufacturing difficulties and high costs. This innovative system utilizes independent adjustment between the power and operating sides. By using a 21-turn servo motor coupled with a multi-turn absolute encoder, high-precision synchronous adjustment is achieved, significantly reducing manufacturing costs.

[0059] Since the chain clips 3 in the chain rail system form an extra-long chain after final assembly, a tensioning device is required. In the traditional chain rail system, the entrance turntable and the exit turntable move toward each other as a whole, and the purpose of tensioning the chain clips 3 is achieved by increasing the distance between the entrance and the exit. This approach usually requires a more complex tensioning structure due to the need for overall movement, and the requirements for the selection of the oil cylinder are large, resulting in higher costs. This chain rail system innovatively designed a split track plate structure in the first outer chain rail 7 and the second outer chain rail 8. The independent movable track beam 102 is used to directly tension the track using the oil cylinder 104, which greatly saves space, has a compact structure, and the oil cylinder 104 can be smaller, resulting in higher economic benefits. At the same time, compared with the complex tensioning structure of the entrance and exit that moves as a whole, this structure is easier to maintain and disassemble and replace.

[0060] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A film transverse stretching device, comprising an oven (1), one end of the oven (1) being an inlet, and the other end of the oven (1) being an outlet, characterized in that: Also includes: A first chain track system, the first chain track system forming a closed loop track around one side of the inlet and outlet of the oven (1); a second chain track system, the second chain track system forming a closed-loop track around the other side of the inlet and outlet of the oven (1), and the spacing between the first chain track system and the second chain track system in the oven (1) is adjustable; The first chain rail system and the second chain rail system are respectively provided with an outlet turntable assembly (2) on the outer side of the outlet of the oven (1), and the two outlet turntable assemblies (2) move synchronously. The outlet turntable assemblies (2) are used to drive the corresponding chain clips (3) on the first chain rail system and the second chain rail system to move synchronously; the first chain rail system and the second chain rail system both include a first inner chain rail (4) and a second inner chain rail (5) provided inside the oven (1), and the first inner chain rail (4) and the second inner chain rail (5) both include a plurality of hinge bottom plates (51), one side of the hinge bottom plate (51) is connected to a track beam A (52), and the other side of the hinge bottom plate (51) is connected to a track beam B (53) through a slider connecting rod mechanism, and the track beam A (52) and the track beam B (53) are both used to install the chain clips (3); and an adjustment mechanism (6) is correspondingly provided on a pair of opposite hinge bottom plates (51) on the first inner chain rail (4) and the second inner chain rail (5).

2. A film transverse stretching device according to claim 1, characterized in that: The slider-link mechanism comprises a connecting rod (54), the two ends of which are rotatably connected to the hinge base plate (51) and the track beam B (53) via fixed seats (55), and the end of the track beam B (53) close to the hinge base plate (51) is slidably connected to the hinge base plate (51).

3. A film transverse stretching device according to claim 2, characterized in that: The adjusting mechanism (6) comprises a first adjusting motor (61), a screw (62) and a screw nut (63); the motor shaft of the first adjusting motor (61) is connected to the screw (62); the screw (62) is rotatably connected to the oven (1); the screw (62) is symmetrically provided with two sections of positive threads and negative threads with opposite rotation directions; the positive threads and negative threads are respectively provided with the screw nuts; the screw nut (63) is provided with an adjusting rod (67); the adjusting rod (67) is connected to the hinge base plate (51).

4. A film transverse stretching device according to claim 3, characterized in that: The hinge base plate (51) is provided with a first sliding groove (511), and the adjustment rod is installed in the first sliding groove (511).

5. A film transverse stretching device according to claim 3 or 4, characterized in that: One end of the screw rod (62) away from the motor is connected to a counter and a mechanical digital position indicator (65) via a belt transmission mechanism (64).

6. A film transverse stretching device according to claim 5, characterized in that: The end of the screw rod (62) away from the motor is connected to a hand wheel (66).

7. The film transverse stretching device according to claim 1, characterized in that: The outlet turntable assembly (2) comprises a first movable platform, a servo motor (21), a reduction gear box (22) and a driving sprocket (23); the movable end of the first movable platform is connected to the reduction gear box (22); the servo motor (21) drives the driving sprocket (23) to rotate via the reduction gear box (22); and the first movable platform is used to drive the reduction gear box (22) to move in a direction perpendicular to the outlet of the oven (1).

8. The film transverse stretching device according to claim 1, characterized in that: The first chain rail system and the second chain rail system are provided with an entrance turntable assembly (9) on the outside of the entrance of the oven (1), and the entrance turntable assembly (9) includes a second movable platform and a sprocket turntable (91). The chain clip (3) passes around the sprocket turntable (91), and the second movable platform is used to drive the sprocket turntable (91) to move in a direction perpendicular to the entrance of the oven (1). A guide rail (92) perpendicular to the moving direction of the second movable platform is provided below the sprocket turntable (91), and a slider slidably connected to the guide rail (92) is provided at the movable end of the second movable platform.

9. The film transverse stretching device according to claim 1, characterized in that: The first chain rail system and the second chain rail system are respectively provided with a chain tensioning mechanism (10) near the outside of the entrance of the oven (1). The chain tensioning mechanism (10) comprises a fixed frame (101), a movable track beam (102), a linear guide rail (103), an oil cylinder (104), a track plate A (105) and a track plate B (106). The movable track beam (102) is hoisted in the fixed frame (101) through the linear guide rail (103). The fixed end of the oil cylinder (104) is connected to the fixed frame (101), and the movable end of the oil cylinder (104) is connected to the movable track beam (102). The track plate A (105) is fixedly connected to the movable track beam (102), and the track plate B (106) is fixedly connected to the fixed frame (101). The track plate A (105) and the track plate B (106) are plugged into each other.

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