A high-precision packaging film printing equipment

Abstract

This invention discloses a high-precision packaging film printing device, comprising a base and a frame. The frame is fixedly connected to the top of the base. An unwinding roller is movably connected to the inner side of the frame via a rotating shaft. Several first-order guide rollers, second-order guide rollers, and third-order guide rollers are movably connected to the inner side of the frame via rotating shafts. The advantages of this invention are: a precise tension adjustment mechanism is designed, with a biomimetic flexible joint connecting the adjusting roller shaft end and the servo cylinder, allowing slight floating of the adjusting roller along the X / Y / Z axes, automatically compensating for lateral film offset or guide roller installation errors. Simultaneously, when the output end of the servo cylinder pushes out, the tension can be reduced; when the output end of the servo cylinder retracts, the tension can be increased, dynamically adjusting the tension of the packaging film, thereby improving the accuracy of the packaging film printing.

Description

Technical Field

[0001] This utility model relates to the field of packaging film printing technology, and in particular to a high-precision packaging film printing equipment. Background Technology

[0002] Traditional printing equipment is mostly designed for paper, and its tension control system relies on mechanical gears or simple electric cylinders, making it difficult to adapt to non-absorbent, low-elongation packaging film materials. During high-speed printing, uneven tension can easily lead to stretching deformation and misregistration. In existing technologies, guide rollers often employ a rigid, fixed structure, which cannot dynamically compensate for lateral film misalignment or mechanical installation errors, and the electric cylinder adjustment response is lag-induced, resulting in large tension fluctuations. Therefore, there is an urgent need for dedicated film printing equipment with high-precision dynamic adjustment capabilities. Utility Model Content

[0003] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0004] Therefore, one objective of this utility model is to provide a high-precision packaging film printing device to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0005] To achieve the above objectives, one embodiment of the present invention provides a high-precision packaging film printing device, including a base and a frame, wherein the frame is fixedly connected to the top of the base;

[0006] The inner side of the frame is movably connected to an unwinding roller via a rotating shaft, and the inner side of the frame is movably connected to several first guide rollers via a rotating shaft. The inner side of the frame is movably connected to a second guide roller via a rotating shaft.

[0007] Several No. 3 guide rollers are movably connected to the inner side of the frame via a rotating shaft, and a printing roller is movably connected to the inner side of the frame via a rotating shaft.

[0008] The frame is provided with a guide groove, and a main shaft is movably connected in the guide groove. Flexible joints are fixedly connected to both ends of the main shaft. The flexible joints are spherical, and ball sleeves are movably connected to the outer surface of the flexible joints.

[0009] An adjusting roller is fixedly connected to the outer surface of the middle section of the main shaft, a connector is fixedly connected to the top of the base, a servo electric cylinder is fixedly connected to the top of the connector, the end of the output end of the servo electric cylinder is fixedly connected to the bottom of the ball sleeve, the flexible joint can float slightly up and down and back and forth in the ball sleeve, and an end roller is movably connected to the inner side of the frame through a rotating shaft.

[0010] Preferably, in any of the above embodiments, the base is welded to the frame, and the inner side of the frame, from front to back, consists of an unwinding roller, a first guide roller, a second guide roller, a third guide roller, a printing roller, and an adjusting roller.

[0011] Using the above technical solution: This device is specifically designed for printing on packaging film. The general process is as follows: Packaging film is on the unwinding roller and is unwound by traction. The packaging film passes between the first guide roller, then around the bottom of the second guide roller, then above the third guide roller, then passes between the printing rollers, is printed by the printing roller, passes around the bottom of the adjusting roller, and finally exits above the end roller. During this process, the unwinding roller stores and unwinds the film, the first, second, and third guide rollers guide the film, the printing rollers print the specific content, and the adjusting rollers precisely adjust the tension.

[0012] The core structure of this device consists of: a guide groove, a main shaft, a flexible joint, a ball sleeve, an adjusting roller, a connector, and a servo cylinder. The key advantages of this device are: unlike paper printing, to ensure the accuracy of packaging film printing and avoid film stretching and deformation, a precise tension adjustment mechanism is designed. The adjusting roller shaft end is connected to the servo cylinder using a biomimetic flexible joint, allowing the adjusting roller to slightly float along the X / Y / Z axes, automatically compensating for lateral film offset or guide roller installation errors. Simultaneously, when the output end of the servo cylinder pushes out, the tension can be reduced; when the output end of the servo cylinder retracts, the tension can be increased, dynamically adjusting the tension of the packaging film, thereby ensuring the accuracy of packaging film printing.

[0013] Preferably, in any of the above schemes, the entire conveying system consisting of the unwinding roller, the first guide roller, the second guide roller, the third guide roller, the printing roller, and the end roller is driven or propelled by a servo motor.

[0014] Preferably, of any of the above schemes, the first guide roller is designed to have three parts, and the second guide roller is provided with one part and located to the side and below the first guide roller.

[0015] This equipment includes a base, frame, unwind rollers, guide roller assembly, printing rollers, adjusting rollers, and end rollers. The frame is vertically welded to the top of the base, and inside it are arranged sequentially the unwind rollers, three first guide rollers, one second guide roller, two third guide rollers, two printing rollers, adjusting rollers, and end rollers. All guide rollers and printing rollers are movably connected to the inside of the frame via rotating shafts, forming a film feeding path.

[0016] 1. Flexible joint connection design

[0017] The adjusting roller is connected to flexible joints at both ends via a main shaft. The flexible joints are spherical structures made of carbon fiber, with a movably nested ball sleeve on their outer surface. The bottom of the ball sleeve is fixed to the output end of a servo cylinder, and the cylinder body of the servo cylinder is fixed to the base via a connector. The flexible joint within the ball sleeve allows the adjusting roller to float slightly along the X / Y / Z axes (float ±2mm), automatically compensating for the following operating conditions:

[0018] Lateral film offset: When the film feed deviates from the centerline, the adjusting roller is automatically deflected in the horizontal plane by the film tension to avoid unilateral overload;

[0019] Guide roller installation error: The flexible joint absorbs slight deformation during the installation of the frame or guide roller, eliminating the influence of assembly stress on tension.

[0020] 2. Dynamic tension control logic

[0021] The servo electric cylinder changes the vertical position of the adjusting roller through its telescopic motion, thereby achieving real-time tension adjustment.

[0022] Ejection state: When the servo cylinder output end ejects, the adjusting roller moves down, the film path lengthens, and the tension decreases;

[0023] Retraction state: When the output end of the servo cylinder retracts, the adjusting roller moves upward, the film path shortens, and the tension increases.

[0024] By combining the characteristics of film materials (such as PET, PE, etc.) and pre-setting the electric cylinder stroke-tension mapping curve, a tension control accuracy of ±0.5N can be achieved.

[0025] Preferably, of any of the above schemes, two guide rollers are arranged in parallel, and two printing rollers are arranged in parallel and located below the guide rollers.

[0026] Preferably, in any of the above solutions, the guide groove is vertically opened, and the flexible joint is made of carbon fiber.

[0027] Workflow:

[0028] Unwinding and Guiding:

[0029] The packaging film roll is installed on the unwinding reel, and the film is pulled around sequentially by a servo motor:

[0030] Above the three No. 1 guide rollers, an S-shaped path is formed to initially flatten the film;

[0031] Below the second guide roller, gravity further eliminates wrinkles on the film surface;

[0032] Above the two No. 3 guide rollers, ensure the film remains flat before entering the printing unit.

[0033] Printing stage:

[0034] The film passes between two sets of printing rollers, where the pattern is printed by an ink system. The printing rollers employ gravure or flexographic structures to accommodate non-absorbent film surfaces.

[0035] Dynamic tension adjustment:

[0036] The printed film passes under the adjusting roller. At this point:

[0037] If excessive film tension is detected (e.g., infrared sensor feedback indicates the film surface is tight), the servo cylinder pushes out, and the adjusting roller moves down to release the tension.

[0038] If the tension is too low (the film surface is loose), the servo cylinder retracts, and the adjusting roller moves up to tighten the film.

[0039] The floating capability of the flexible joint allows the adjusting roller to automatically fine-tune its position when the tension changes, avoiding localized stress concentration caused by rigid mechanisms.

[0040] Rewinding and Output:

[0041] The adjusted film is guided by the end roller and wound up by the downstream winding device. The height of the end roller is fixed, forming a reference point with the adjusting roller to create a tension feedback closed loop.

[0042] Preferably, in any of the above embodiments, the height of the adjusting roller is adjustable, and the adjusting roller is located directly below the printing roller.

[0043] Technical advantages:

[0044] High-precision tension control

[0045] The servo electric cylinder works in conjunction with the flexible joint, achieving a response speed of 10ms and controlling tension fluctuation within ±1%, which is significantly better than traditional mechanical adjustment (more than ±5%).

[0046] Automatic correction and anti-interference:

[0047] The multidimensional floating characteristics of flexible joints can absorb interference such as equipment vibration and film deviation, reduce the frequency of manual intervention, and improve the stability of continuous printing.

[0048] Compatibility and scalability:

[0049] The height of the adjusting roller is adjustable to accommodate films of different thicknesses (0.02-0.2mm).

[0050] Servo electric cylinders can be connected to PLC systems and support linkage with online detection modules (such as CCD cameras) to achieve fully automatic tension closed-loop control.

[0051] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0052] This high-precision packaging film printing equipment, through the coordinated arrangement of guide grooves, main shaft, flexible joints, ball sleeves, adjusting rollers, joints, and servo electric cylinders, can achieve the following:

[0053] Better high-precision tension control:

[0054] The servo electric cylinder works in conjunction with the flexible joint, achieving a response speed of 10ms and controlling tension fluctuations within ±1%, which is significantly better than traditional mechanical adjustment.

[0055] Automatic correction and anti-interference functions:

[0056] The multidimensional floating characteristics of flexible joints can absorb interference such as equipment vibration and film deviation, reduce the frequency of manual intervention, and improve the stability of continuous printing.

[0057] Unlike paper printing, a precise tension adjustment mechanism is designed to ensure the accuracy of packaging film printing and avoid film stretching and deformation. The adjustment roller shaft end is connected to the servo cylinder using a biomimetic flexible joint, allowing the adjustment roller to float slightly on the X / Y / Z axes. This automatically compensates for lateral film offset or guide roller installation errors. At the same time, when the output end of the servo cylinder pushes out, the tension can be adjusted to be smaller, and when the output end of the servo cylinder retracts, the tension can be adjusted to be larger, dynamically adjusting the tension of the packaging film to ensure the accuracy of packaging film printing.

[0058] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0059] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0060] Figure 1 This is a first-view structural schematic diagram of the present invention;

[0061] Figure 2 This is a structural schematic diagram of the present invention from a second perspective;

[0062] Figure 3 This is a structural schematic diagram of the present invention from a third-view perspective;

[0063] Figure 4 This utility model Figure 2 Enlarged structural diagram at point A;

[0064] Figure 5 This is a schematic diagram of the internal structure of this utility model.

[0065] In the diagram: 1-base, 2-frame, 3-unwinding roller, 4-guide roller 1, 5-guide roller 2, 6-guide roller 3, 7-printing roller, 8-guide groove, 9-main shaft, 10-flexible joint, 11-ball sleeve, 12-adjusting roller, 13-joint, 14-servo electric cylinder, 15-end roller. Detailed Implementation

[0066] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0067] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0068] like Figure 1-5 As shown, this high-precision packaging film printing equipment includes a base 1 and a frame 2, with the frame 2 fixedly connected to the top of the base 1.

[0069] The inner side of frame 2 is movably connected to unwinding roller 3 via a rotating shaft. The inner side of frame 2 is movably connected to several first guide rollers 4 via a rotating shaft. The inner side of frame 2 is movably connected to second guide rollers 5 via a rotating shaft.

[0070] Several No. 3 guide rollers 6 are movably connected to the inner side of frame 2 via a rotating shaft, and printing rollers 7 are movably connected to the inner side of frame 2 via a rotating shaft.

[0071] A guide groove 8 is provided on the frame 2, and a main shaft 9 is movably connected in the guide groove 8. Flexible joints 10 are fixedly connected to both ends of the main shaft 9. The flexible joints 10 are spherical, and a ball sleeve 11 is movably connected to the outer surface of the flexible joints 10.

[0072] An adjusting roller 12 is fixedly connected to the outer surface of the middle section of the main shaft 9. A connector 13 is fixedly connected to the top of the base 1. A servo electric cylinder 14 is fixedly connected to the top of the connector 13. The end of the output end of the servo electric cylinder 14 is fixedly connected to the bottom of the ball sleeve 11. The flexible joint 10 can float slightly up and down and back and forth in the ball sleeve 11. An end roller 15 is movably connected to the inner side of the frame 2 through a rotating shaft.

[0073] Example 1: The base 1 is welded to the frame 2. The inner side of the frame 2, from front to back, consists of an unwinding roller 3, a first guide roller 4, a second guide roller 5, a third guide roller 6, a printing roller 7, and an adjusting roller 12. The entire conveying system, composed of the unwinding roller 3, the first guide roller 4, the second guide roller 5, the third guide roller 6, the printing roller 7, and the end roller 15, is driven by a servo motor. There are three first guide rollers 4, and one second guide roller 5 is located below and to the side of the first guide roller 4.

[0074] Example 2: This equipment includes a base 1, a frame 2, an unwinding roller 3, a guide roller assembly, a printing roller 7, an adjusting roller 12, and an end roller 15. The frame 2 is vertically welded to the top of the base 1. Inside, the unwinding roller 3, three first guide rollers 4, one second guide roller 5, two third guide rollers 6, two printing rollers 7, the adjusting roller 12, and the end roller 15 are arranged sequentially. All guide rollers and printing rollers are movably connected to the inside of the frame 2 via rotating shafts, forming a film feeding path. Flexible joint connection design.

[0075] The adjusting roller 12 is connected to flexible joints 10 at both ends via a main shaft 9. The flexible joints 10 are spherical structures made of carbon fiber, with a movably nested ball sleeve 11 on their outer surface. The bottom of the ball sleeve 11 is fixed to the output end of a servo cylinder 14, and the cylinder body of the servo cylinder 14 is fixed to the base 1 via a connector 13. The flexible joints 10 within the ball sleeve 11 allow the adjusting roller 12 to float slightly along the X / Y / Z axes (float ±2mm), automatically compensating for the following operating conditions:

[0076] Lateral film offset: When the film feed deviates from the center line, the adjusting roller 12 is subjected to the film tension and deflects adaptively in the horizontal plane to avoid unilateral overload;

[0077] Guide roller installation error: Slight deformation during installation of the flexible joint absorbs the frame 2 or the guide roller, eliminating the influence of assembly stress on tension. Dynamic tension control logic.

[0078] The servo electric cylinder 14 changes the vertical position of the adjusting roller 12 through its telescopic movement, thereby achieving real-time tension adjustment.

[0079] Ejection state: When the output end of the servo cylinder 14 ejects, the adjusting roller 12 moves down, the film path lengthens, and the tension decreases;

[0080] Retraction state: When the output end of the servo cylinder 14 retracts, the adjusting roller 12 moves upward, the film path is shortened, and the tension increases.

[0081] By pre-setting the electric cylinder stroke-tension mapping curve based on the characteristics of the film material (such as PET, PE, etc.), a tension control accuracy of ±0.5N is achieved. Two guide rollers 6 are arranged in parallel, and two printing rollers 7 are arranged in parallel and located below and to the side of the guide rollers 6. The guide groove 8 is vertically opened, and the flexible joint 10 is made of carbon fiber.

[0082] Material selection

[0083] The flexible joint 10 is made of carbon fiber reinforced composite material, which is lightweight (density 1.6g / cm³) and has strong fatigue resistance.

[0084] The surface of the adjusting roller 12 is plated with hard chrome and polished, with a roughness Ra≤0.1μm, to reduce film friction damage.

[0085] Example of control parameters

[0086] Servo electric cylinder 14 stroke range: 0-50mm;

[0087] Tension adjustment resolution: 0.1 N / mm;

[0088] Maximum adjustment speed: 100 mm / s. The height of the adjusting roller 12 is adjustable, and the adjusting roller 12 is located directly below the printing roller 7.

[0089] The working principle of this utility model is as follows:

[0090] Unwinding and Guiding

[0091] The packaging film roll is installed on the unwinding reel 3, and the film is pulled around sequentially by a servo motor:

[0092] Above the three No. 1 guide rollers 4, an S-shaped path is formed to initially flatten the film;

[0093] Below the second guide roller 5, the wrinkles on the film surface are further eliminated by gravity.

[0094] Above the two No. 3 guide rollers 6, ensure that the film remains flat before entering the printing unit.

[0095] Printing stage

[0096] The film passes between two sets of printing rollers 7, and the pattern is printed by the ink system. The printing rollers 7 adopt a gravure or flexographic structure to adapt to non-absorbent film surfaces.

[0097] Dynamic tension adjustment

[0098] The printed film passes under the adjusting roller 12. At this point:

[0099] If excessive film tension is detected (e.g., infrared sensor feedback indicates the film surface is tight), the servo cylinder 14 pushes out, and the adjusting roller 12 moves down to release the tension.

[0100] If the tension is too low (the film surface is loose), the servo cylinder 14 retracts, and the adjusting roller 12 moves up to tighten the film.

[0101] The floating capability of the flexible joint 10 allows the adjusting roller 12 to automatically fine-tune its position when the tension changes, avoiding local stress concentration caused by the rigid mechanism.

[0102] Rewind and Output

[0103] The adjusted film is guided by the end roller 15 and wound up by the downstream winding device. The height of the end roller 15 is fixed, forming a reference point with the adjusting roller 12 to form a tension feedback closed loop.

[0104] Compared with the prior art, the present invention has the following advantages:

[0105] This high-precision packaging film printing equipment, through the coordinated arrangement of guide groove 8, main shaft 9, flexible joint 10, ball sleeve 11, adjusting roller 12, connector 13, and servo electric cylinder 14, can achieve the following:

[0106] Better high-precision tension control:

[0107] The servo electric cylinder 14 works in conjunction with the flexible joint 10, achieving a response speed of 10ms and controlling tension fluctuations within ±1%, which is significantly better than traditional mechanical adjustment.

[0108] Automatic correction and anti-interference functions:

[0109] The multidimensional floating characteristics of the flexible joint 10 can absorb interference such as equipment vibration and film deviation, reduce the frequency of manual intervention, and improve the stability of continuous printing.

[0110] Unlike paper printing, a precise tension adjustment mechanism is designed to ensure the accuracy of packaging film printing and avoid film stretching and deformation. The shaft end of the adjustment roller 12 is connected to the servo cylinder 14 using a biomimetic flexible joint, allowing the adjustment roller 12 to float slightly on the X / Y / Z axes, automatically compensating for lateral film offset or guide roller installation errors. At the same time, when the output end of the servo cylinder 14 pushes out, the tension can be adjusted to be smaller, and when the output end of the servo cylinder 14 retracts, the tension can be adjusted to be larger, dynamically adjusting the tension of the packaging film, thereby ensuring the accuracy of packaging film printing.

Claims

1. A high-precision packaging film printing equipment, characterized in that, Includes a base (1) and a frame (2), with the frame (2) fixedly connected to the top of the base (1); The inner side of the frame (2) is movably connected to the unwinding wheel (3) via a rotating shaft, and the inner side of the frame (2) is movably connected to several first guide rollers (4) via a rotating shaft, and the inner side of the frame (2) is movably connected to second guide rollers (5) via a rotating shaft. The inner side of the frame (2) is movably connected to several No. 3 guide rollers (6) via a rotating shaft, and the inner side of the frame (2) is movably connected to a printing roller (7) via a rotating shaft. The frame (2) is provided with a guide groove (8), and a main shaft (9) is movably connected in the guide groove (8). Flexible joints (10) are fixedly connected to both ends of the main shaft (9). The flexible joints (10) are spherical, and a ball sleeve (11) is movably connected to the outer surface of the flexible joints (10). An adjusting roller (12) is fixedly connected to the outer surface of the middle section of the main shaft (9). A connector (13) is fixedly connected to the top of the base (1). A servo electric cylinder (14) is fixedly connected to the top of the connector (13). The end of the output end of the servo electric cylinder (14) is fixedly connected to the bottom of the ball sleeve (11). The flexible joint (10) can float slightly up and down and back and forth in the ball sleeve (11). An end roller (15) is movably connected to the inner side of the frame (2) through a rotating shaft.

2. The high-precision packaging film printing equipment as described in claim 1, characterized in that: The base (1) is welded to the frame (2). The inner side of the frame (2) consists of, from front to back, an unwinding roller (3), a first guide roller (4), a second guide roller (5), a third guide roller (6), a printing roller (7), and an adjusting roller (12).

3. The high-precision packaging film printing equipment as described in claim 2, characterized in that: The entire conveying system, consisting of the unwinding roller (3), the first guide roller (4), the second guide roller (5), the third guide roller (6), the printing roller (7), and the end roller (15), is driven or propelled by a servo motor.

4. The high-precision packaging film printing equipment as described in claim 3, characterized in that: The first guide roller (4) is designed to have three parts, and the second guide roller (5) is provided with one part and located to the side and below the first guide roller (4).

5. The high-precision packaging film printing equipment as described in claim 4, characterized in that: Two of the No. 3 guide rollers (6) are arranged in parallel, and two of the printing rollers (7) are arranged in parallel and located below the No. 3 guide rollers (6).

6. The high-precision packaging film printing equipment as described in claim 5, characterized in that: The guide groove (8) is vertically opened, and the flexible joint (10) is made of carbon fiber.

7. The high-precision packaging film printing equipment as described in claim 6, characterized in that: The height of the adjusting roller (12) is adjustable, and the adjusting roller (12) is located directly below the printing roller (7).

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