Packaging machine upper film correction device

Abstract

This utility model discloses a film-mounting correction device for a packaging machine, including a side plate, a transmission box, and a film-feeding frame. The transmission box contains four sets of guide connecting assemblies and a telescopic drive mechanism. The guide shafts of the guide connecting assemblies pass through the side plate and connect to the film-feeding frame. The telescopic drive mechanism uses a stepper motor in conjunction with a threaded transmission sleeve to drive the film-feeding frame to move axially along the guide shaft. The film-feeding frame is equipped with an upper film unwinding shaft, a swing-arm type self-weight tensioning roller, and multiple sets of guide rollers. A vertical frame plate and a detection platform are located at the output end, with photoelectric position sensors on both sides of the detection platform. This utility model ensures the translational stability of the film-feeding frame through four-axis guidance and achieves real-time film-mounting correction through photoelectric detection and stepper motor closed-loop control, ensuring precise alignment of the upper and lower films. It is suitable for film-mounting accuracy control in equipment such as vacuum packaging machines.

Description

Technical Field

[0001] This utility model relates to the field of packaging equipment technology, specifically to an upper film correction device used in vacuum packaging machines or similar film packaging equipment. Background Technology

[0002] In a fully automated vacuum packaging production line, the alignment accuracy of the upper and lower films directly affects the sealing quality and appearance consistency of the packaged product. After the upper film is unwound from the unwinding station, it is conveyed to the forming and heat-sealing stations by multiple sets of guide rollers. Due to factors such as winding eccentricity of the film roll itself, film tension fluctuations, guide roller installation errors, and equipment vibration, the upper film is prone to lateral deviation during the film feeding process, resulting in misalignment of the upper and lower film edges, and consequently, quality defects such as skewed seals, air leakage, and uneven cutting.

[0003] In existing technologies, the film material correction devices of packaging machines mostly adopt a single-axis or dual-axis guided moving frame structure, which achieves correction by driving the moving frame to move laterally as a whole through a cylinder or ordinary motor. This type of structure has the following shortcomings: First, there are few guide support points, and the moving frame is prone to swaying and jamming during reciprocating motion, especially for film materials with a large width, making it difficult to ensure the parallelism of the film-running frame and resulting in a delayed correction response; Second, the driving method mostly uses cylinder push, which has poor positioning accuracy and cannot achieve precise micro-displacement adjustment, making it difficult to meet the requirements of high-precision vacuum packaging; Third, the film material tensioning mostly adopts a fixed counterweight or spring structure, and the tension force is not adjustable, which cannot adapt to the film-running requirements of different thicknesses and materials; Fourth, the film edge detection sensors are mostly fixedly installed, making it inconvenient to adjust when changing film materials of different widths, and there is no pre-guidance measure before the film material enters the detection area, which can easily exceed the sensor detection range when there is a large deviation; Fifth, there is no effective dustproof seal between the guide shaft and the bushing, and dust and film debris in the packaging workshop can easily enter the mating surface, accelerating wear and affecting the guiding accuracy.

[0004] Therefore, there is an urgent need to develop a packaging machine film correction device with good guiding stability, high correction accuracy, and strong adaptability to solve the above-mentioned problems in the existing technology. Utility Model Content

[0005] To address the technical shortcomings of existing packaging machine film-adjusting devices, such as poor guiding stability, insufficient correction accuracy, and weak adaptability to film materials, this paper provides a packaging machine film-adjusting device that offers stable guidance, precise positioning, adjustable tension, and adaptability to various film widths.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a film-aligning device for a packaging machine, comprising a side plate, a transmission box fixed to one side of the side plate, and a film-feeding frame installed on the other side of the side plate; at least two sets of guide connection assemblies are provided inside the transmission box, each set of guide connection assemblies including a bushing and a guide shaft passing through the bushing, one end of the guide shaft passing through the transmission box and the side plate and fixedly connected to the film-feeding frame; a telescopic drive mechanism is also provided inside the transmission box, the telescopic drive mechanism including a motor and a threaded transmission sleeve, the output shaft end of the motor having an external thread, and the threaded transmission sleeve being fixed to the film-feeding frame. The frame passes through the side plate and the side wall of the transmission box, forming a threaded transmission engagement with the external thread of the motor output shaft; the film feeding frame is equipped with an upper film unwinding shaft, a self-weight tensioning roller, and several guide rollers; the output end of the film feeding frame is provided with a vertical frame plate, and multiple guide rollers are arranged vertically along the vertical frame plate; a detection platform is provided below the vertical frame plate, and photoelectric position sensors are respectively installed on both sides of the detection platform. The two photoelectric position sensors are used to detect the position of the two sides of the upper film. The photoelectric position sensors are electrically connected to a controller, and the controller is electrically connected to a motor to control the left and right displacement adjustment of the film feeding frame.

[0007] Furthermore, there are four sets of guide connection components, which are respectively arranged at the four corner positions inside the transmission box to form a four-point support guide structure.

[0008] Furthermore, a rotating shaft is rotatably mounted on the side wall of the film-moving frame, and a swing arm is fixedly connected to the end of the rotating shaft. The shaft end of the self-weight tensioning roller is fixed to the free end of the swing arm, and the self-weight tensioning roller provides tension by swinging the swing arm around the rotating shaft.

[0009] Furthermore, the rotating shaft is also provided with a damping adjustment component, which includes a damping seat fixed on the film-feeding frame and a friction plate disposed between the damping seat and the rotating shaft, for adjusting the swing damping of the self-weight tensioning roller.

[0010] Furthermore, the detection stage is provided with adjustment grooves extending along the membrane width on both sides, and the photoelectric position sensor is installed in the adjustment grooves by locking components to adapt to the detection of upper membranes of different widths.

[0011] Furthermore, the membrane entry side of the testing station is also provided with a pre-guiding component, which includes two guide plates arranged in a funnel shape, forming a gradually narrowing channel between the two guide plates for the upper membrane to pass through.

[0012] Furthermore, the motor is a stepper motor, and the inner hole of the threaded transmission sleeve is provided with an internal thread that mates with the external thread of the motor output shaft, forming a lead screw and nut transmission pair.

[0013] Furthermore, dustproof sealing rings are provided at both ends of the bushing, and dustproof rings are also provided on the side wall of the transmission box at the point where the guide shaft passes through.

[0014] Furthermore, a limiting plate is installed at the end of the guide shaft away from the membrane frame to limit the maximum displacement of the membrane frame.

[0015] Furthermore, among the multiple guide rollers on the vertical frame plate, at least one guide roller has a position adjustment seat at its shaft end. The position adjustment seat can be adjusted up and down along the long groove of the vertical frame plate to adjust the wrap angle between adjacent guide rollers.

[0016] The beneficial technical effects of this utility model are: 1. High guiding stability: Four sets of guiding connection components are distributed at the four corners to form four-point support and guidance. When the membrane frame moves laterally, the force is balanced, which effectively avoids swaying and jamming, ensures the flatness and parallelism of the membrane, and greatly improves the stability of the correction movement.

[0017] 2. High correction accuracy: The stepper motor and lead screw and nut drive pair drive the film-moving frame. Combined with photoelectric position sensor for real-time detection and closed-loop control, it can achieve micron-level precise displacement adjustment, fast response speed, and ensure precise alignment of the upper and lower film edges.

[0018] 3. Adjustable tension: The self-weight tensioning roller provides tension through a swing arm structure and is equipped with a damping adjustment component. The swing damping can be adjusted according to the film thickness and material characteristics to meet the film tension requirements of various film materials such as PE, PET, and composite films.

[0019] 4. High adaptability: The photoelectric position sensor can be installed by adjusting the sliding groove, and the spacing can be freely adjusted along the width of the film to adapt to film products with different widths; together with the pre-guided positive component at the inlet side of the film, it can prevent the film material from being out of the detection range when it shifts significantly.

[0020] 5. High durability: Dustproof sealing rings are set at both ends of the bushing to effectively prevent dust and film debris from entering the guide mating surface and extend the service life of the guide pair; limit plates are set at both ends of the side plate to prevent the film-carrying frame from being over-impacted and improve the reliability of the equipment.

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0022] Figure 1 This is a perspective view of a specific embodiment of the present utility model; Figure 2 This is a side view of a specific embodiment of the present utility model; Figure 3 This is a partial perspective view of a specific embodiment of the present utility model; Figure 4 for Figure 3 Enlarged view of A in the middle; Figure 5 for Figure 3 A magnified view of B in the middle.

[0023] Explanation of reference numerals in the attached drawings: 1. Side plate; 11. Limiting plate; 2. Transmission box; 3. Film feeding frame; 31. Upper film unwinding shaft; 32. Self-weight tensioning roller; 33. Guide roller; 34. Vertical frame plate; 341. Position adjustment seat; 35. Rotating shaft; 36. Swing arm; 4. Guide connection assembly; 41. Bushing; 42. Guide shaft; 5. Telescopic drive mechanism; 51. Motor; 52. Threaded transmission sleeve; 6. Detection table; 61. Photoelectric position sensor; 62. Adjustment slide; 63. Pre-guided assembly; 631. Guide plate. Detailed Implementation

[0024] The present invention will be described in detail below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0025] like Figure 1 — Figure 3 As shown in the figure, this embodiment discloses a film correction device for a packaging machine, which mainly includes a side plate 1, a transmission box 2, a film feeding frame 3, a guide connection assembly 4, a telescopic drive mechanism 5, and a detection table 6.

[0026] Side plate 1 serves as the mounting base for the entire machine and is vertically mounted. A transmission box 2 is fixedly mounted on the left side of side plate 1, and a film-feeding frame 3 is mounted on the right side of side plate 1. The film-feeding frame 3 can move left and right relative to side plate 1 in the horizontal direction (i.e., the film width direction).

[0027] The transmission box 2 is a closed box structure with four sets of guide connection components 4 inside. These four sets of guide connection components 4 are arranged at the four corners of the transmission box 2, forming a rectangular four-point support layout. Each set of guide connection components 4 includes a bushing 41 and a guide shaft 42. The bushing 41 is fixedly installed on the inner wall of the transmission box 2, and the guide shaft 42 is horizontally inserted inside the bushing 41 and can slide axially along the bushing 41. The right end of the guide shaft 42 passes through the right side wall and side plate 1 of the transmission box 2 in sequence, and its end is fixedly connected to the left side wall of the membrane frame 3. The four sets of guide shafts 42 are arranged in parallel, together forming the translational guide system of the membrane frame 3, ensuring that the membrane frame 3 performs linear telescoping motion along the axial direction of the guide shafts 42 without swaying. Dustproof sealing rings are respectively installed at the left and right ends of the bushing 41, and dustproof rings are also provided at the holes through which the guide shaft 42 passes on the side wall of the transmission box 2 to prevent external dust and film debris from entering the mating surface between the bushing 41 and the guide shaft 42.

[0028] The transmission box 2 is also equipped with a telescopic drive mechanism 5. The telescopic drive mechanism 5 includes a motor 51 and a threaded transmission sleeve 52. The motor 51 is a stepper motor, fixedly installed on the left inner wall of the transmission box 2. The output shaft of the motor 51 extends horizontally to the right, and the right end of the output shaft is machined with an external thread. The threaded transmission sleeve 52 is a cylindrical structure with an internal thread machined in its inner hole. The right end of the threaded transmission sleeve 52 is fixedly installed in the middle of the left side wall of the film-carrying frame 3. The threaded transmission sleeve 52 passes through the side plate 1 and the right side wall of the transmission box 2 to the left. Its internal thread meshes with the external thread of the output shaft of the motor 51, forming a screw-nut transmission pair. When the motor 51 rotates, the rotational motion is converted into linear motion through the screw-nut transmission, pushing the threaded transmission sleeve 52 and the film-carrying frame 3 to move left and right along the guide shaft 42. The stepper motor can precisely control the rotation angle and speed, thereby achieving precise control of the displacement of the film-carrying frame 3.

[0029] A limit plate 11 is installed at the end of the guide shaft 42 away from the membrane frame to limit the maximum displacement of the membrane frame 3.

[0030] The film feeding frame 3 is a rectangular frame structure, on which an upper film unwinding shaft 31, a self-weight tensioning roller 32, and several guide rollers 33 are mounted. The upper film unwinding shaft 31 is rotatably mounted on the upper part of the film feeding frame 3 for mounting the upper film roll. The self-weight tensioning roller 32 is mounted in the middle of the film feeding frame 3 via a swing arm structure: a rotating shaft 35 is rotatably mounted on the front and rear side walls of the film feeding frame 3. The rotating shaft 35 is horizontally positioned, and one end of the rotating shaft 35 is fixedly connected to a swing arm 36. The shaft end of the self-weight tensioning roller 32 is fixed to the free ends of the two swing arms 36. The self-weight tensioning roller 32 swings downward around the rotating shaft 35 by its own weight through the swing arms 36, thereby applying tension to the upper film passing below it.

[0031] A damping adjustment assembly is also provided on the rotating shaft 35. The damping adjustment assembly includes a damping seat and a friction plate. The damping seat is fixedly installed on the side wall of the film-carrying frame 3, and the friction plate is disposed between the damping seat and the end face of the rotating shaft 35. By adjusting the locking screw on the damping seat, the clamping degree of the friction plate can be changed, thereby adjusting the friction damping of the rotating shaft 35, that is, adjusting the swing damping of the self-weight tensioning roller 32, so that the tension force can adapt to the requirements of film materials of different materials and thicknesses.

[0032] Multiple guide rollers 33 are also distributed on the film-feeding frame 3, which are arranged on the upper sides and the middle, respectively, to change the direction of the upper film and provide support and guidance.

[0033] A vertical frame plate 34 is provided at the right end, i.e., the output end, of the film-feeding frame 3. The vertical frame plate 34 is vertically arranged, and multiple guide rollers 33 are arranged vertically on its surface. After passing through the self-weight tension roller 32 and the upper guide roller, the upper film enters the vertical frame plate 34 and moves in an S-shape between the multiple vertically arranged guide rollers 33 to ensure flat film feeding and uniform tension. Among the multiple guide rollers 33 on the vertical frame plate 34, at least one guide roller 33 has a position adjustment seat 341 installed on its shaft end. A vertical long groove is correspondingly opened on the vertical frame plate 34. The position adjustment seat 341 can slide up and down along the long groove and be locked with screws, thereby adjusting the height position of the guide roller 33, changing the wrap angle of the upper film on each guide roller, and further optimizing the film feeding tension.

[0034] A detection platform 6 is installed below the vertical frame plate 34. The detection platform 6 is horizontally arranged, and the upper membrane passes downward through the detection platform 6 after being output from the vertical frame plate 34. Photoelectric position sensors 61 are installed on the left and right sides of the detection platform 6, respectively, corresponding to the left and right edges of the upper membrane, for real-time detection of the lateral position of the upper membrane edges. An adjustment groove 62 is formed on the platform surface of the detection platform 6 along the left-right direction, as detailed below. Figure 5As shown, the photoelectric position sensor 61 is installed in the adjusting slide 62 by bolts or other locking parts. By loosening the locking parts, the position of the photoelectric position sensor 61 can be adjusted left and right along the adjusting slide 62 to meet the needs of film detection of different widths.

[0035] A pre-guiding and aligning component 63 is also provided on the upper side of the membrane entry side of the testing station 6. Specifically, as follows... Figure 4 As shown, the pre-guiding component 63 includes two guide plates 631. The two guide plates 631 are arranged symmetrically in a funnel shape, with a large opening at the upper end and a small opening at the lower end. A gradually narrowing channel is formed between them, which is wider at the top and narrower at the bottom. After the upper film enters the channel from above, it is gradually gathered and guided to prevent the upper film from deviating too much and exceeding the detection range of the photoelectric position sensor 61.

[0036] The photoelectric position sensor 61 is electrically connected to an external controller, which is also electrically connected to the motor 51. During operation, the photoelectric position sensors 61 on both sides detect the position signal of the upper film edge in real time and transmit it to the controller. Once the upper film shifts laterally, the controller outputs a control signal according to the amount and direction of the shift, driving the stepper motor 51 to rotate by the corresponding angle. Through the threaded transmission sleeve 52, the entire film-laying frame 3 moves left and right along the guide shaft 42, thereby causing the entire film-laying system to shift laterally, so that the edge of the upper film returns to the correct position, ensuring that the upper and lower films are precisely aligned in the subsequent forming and heat-sealing stages.

[0037] The film feeding path is as follows: the film roll is set on the film unwinding shaft 31, the film is drawn downwards, passes under the self-weight tensioning roller 32 for tensioning, then passes through the guide rollers 33 on both sides of the upper part of the film feeding frame 3 for reversal, and then enters the vertical frame plate 34 to pass through multiple vertical guide rollers 33 for leveling, and finally passes downwards through the pre-guided positive component 63 and photoelectric position sensor 61 detection area of ​​the detection table 6, and is output to the subsequent forming station and vacuum heat sealing station.

[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A film-coating correction device for a packaging machine, characterized in that: The system includes a side plate (1), a transmission box (2) fixed on one side of the side plate (1), and a film-moving frame (3) installed on the other side of the side plate (1). The transmission box (2) is provided with at least two sets of guide connection assemblies (4). Each set of guide connection assemblies (4) includes a bushing (41) and a guide shaft (42) passing through the bushing (41). One end of the guide shaft (42) passes through the transmission box (2) and the side plate (1) and is fixedly connected to the film-moving frame (3). The transmission box (2) is also provided with a telescopic drive mechanism (5). The telescopic drive mechanism (5) includes a motor (51) and a threaded transmission sleeve (52). The output shaft end of the motor (51) is provided with an external thread. The threaded transmission sleeve (52) is fixed on the film-moving frame (3) and passes through the side plate (1) and the transmission box (3). The side wall of the box (2) forms a threaded transmission fit with the external thread of the output shaft of the motor (51); the film feeding frame (3) is equipped with an upper film unwinding shaft (31), a self-weight tensioning roller (32) and several guide rollers (33); the output end of the film feeding frame (3) is provided with a vertical frame plate (34), and several guide rollers (33) are arranged vertically on the vertical frame plate (34); a detection platform (6) is provided below the vertical frame plate (34), and photoelectric position sensors (61) are respectively installed on both sides of the detection platform (6). The two photoelectric position sensors (61) are respectively used to detect the position of the two sides of the upper film. The photoelectric position sensors (61) are electrically connected to the controller, and the controller is electrically connected to the motor (51) to control the left and right displacement adjustment of the film feeding frame (3).

2. The film-adjusting device for a packaging machine according to claim 1, characterized in that: A rotating shaft (35) is rotatably mounted on the side wall of the film-moving frame (3). A swing arm (36) is fixedly connected to the end of the rotating shaft (35). The shaft end of the self-weight tension roller (32) is fixed to the free end of the swing arm (36). The self-weight tension roller (32) swings around the rotating shaft (35) via the swing arm (36) to provide tension.

3. The film-adjusting device for a packaging machine according to claim 2, characterized in that: The rotating shaft (35) is also provided with a damping adjustment component, which includes a damping seat fixed on the film-moving frame (3) and a friction plate disposed between the damping seat and the rotating shaft (35) for adjusting the swing damping of the self-weight tensioning roller (32).

4. The film-adjusting device for a packaging machine according to claim 1, characterized in that: The detection stage (6) is provided with adjustment grooves (62) extending along the membrane width direction on both sides. The photoelectric position sensor (61) is installed in the adjustment groove (62) by a locking member to adapt to the detection of upper membranes of different widths.

5. The film-adjusting device for a packaging machine according to claim 1, characterized in that: The detection station (6) is also provided with a pre-guided positive component (63) on the membrane entry side. The pre-guided positive component (63) includes two guide plates (631) arranged in a funnel shape, and a gradually narrowing channel is formed between the two guide plates (631) for the upper membrane to pass through.

6. The film-adjusting device for a packaging machine according to claim 1, characterized in that: The motor (51) is a stepper motor, and the inner hole of the threaded transmission sleeve (52) is provided with an internal thread that mates with the external thread of the motor output shaft, forming a screw and nut transmission pair.

7. The film-adjusting device for a packaging machine according to claim 1, characterized in that: Dustproof sealing rings are provided at both ends of the bushing (41), and dustproof rings are also provided on the side wall of the transmission box (2) at the point where the guide shaft (42) passes through.

8. The film-adjusting device for a packaging machine according to claim 1, characterized in that: The guide shaft (42) is equipped with a limiting plate (11) at the end away from the membrane frame to limit the maximum displacement of the membrane frame (3).

9. The film-adjusting device for a packaging machine according to claim 1, characterized in that: Among the multiple guide rollers (33) on the vertical frame plate (34), at least one guide roller (33) has a position adjustment seat (341) at its shaft end. The position adjustment seat (341) can be adjusted up and down along the long groove of the vertical frame plate (34) to adjust the wrap angle between adjacent guide rollers.

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