A longitudinal and horizontal synchronization film pulling mechanism for high speed film wrapping machine

Abstract

The utility model discloses a longitudinal and transverse synchronous membrane drawing mechanism for high -speed sleeve film machine, including frame and the symmetrical setting of two sets of membrane drawing subassembly, and each set of membrane drawing subassembly includes a main stretching drive unit and two vice stretching drive units, and the main stretching drive unit is driven gear through main servo motor, drives positive rack and reverse rack synchronous reverse movement, and then drives two vice stretching drive units along Y direction movement, and every vice stretching drive unit is equipped with independent vice servo motor, and is driven claw along X direction movement through gear and rack drive, and main vice servo motor controls cooperatively, realizes the compound motion of claw in plane, the utility model discloses the way that mechanical rigidity synchronization and electric control follow synchronization are combined, effectively solved the problem of poor synchronism of existing membrane drawing mechanism, and the problem of inaccurate positioning, has compact structure, control precision height, strong adaptability and so on, is applicable to high -speed sleeve film packaging equipment.

Description

Technical Field

[0001] This utility model relates to a longitudinal and transverse synchronous film stretching mechanism for a high-speed shrink wrapping machine, belonging to the technical fields of high-speed shrink wrapping equipment, heat shrink machines, packaging equipment, and automation equipment. Background Technology

[0002] In the modern packaging industry, high-speed film wrapping machines are widely used for skin packaging of various products. One of the core processes is stretching the roll film to a predetermined size to fit the product. Existing film stretching mechanisms mostly use hydraulic cylinders or asynchronous motors, which have significant drawbacks: First, in terms of efficiency, the start and stop positions of hydraulic cylinders and asynchronous motors are difficult to control precisely at high speeds, and their efficiency is low at low speeds, failing to meet the pace of high-speed production; second, in terms of synchronization, the four stretching points are usually controlled by independent drive units. Due to the changes in resistance at each point, it is difficult to maintain a consistent running speed, causing the film to misalign and twist during the stretching process, resulting in deviations in the final packaging size and a low product qualification rate.

[0003] Therefore, there is an urgent need for a film stretching mechanism that can simultaneously achieve high speed, high precision, and excellent synchronization. Utility Model Content

[0004] This invention addresses the problems of low efficiency and poor synchronization in existing film-pulling mechanisms, which lead to inaccurate packaging dimensions. It provides a high-speed film-pulling machine with longitudinal and transverse synchronous film-pulling mechanism that combines mechanical rigid synchronization with electronically controlled follow-up synchronization.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a longitudinal and transverse synchronous film stretching mechanism for a high-speed film wrapping machine, including a frame, on which two sets of film stretching assemblies are symmetrically arranged. Each set of film stretching assemblies includes a main stretching drive unit and two auxiliary stretching drive units driven by the main stretching drive unit and moving synchronously in opposite directions. The main stretching drive unit is used to drive the pull claw to move along the Y direction, and the auxiliary stretching drive units are used to drive the pull claw to move along the X direction. The main stretching drive unit includes a main servo motor, a drive gear, a forward rack, a reverse rack, and a transverse main plate. The transverse main plate is horizontally fixed between the frames. The main servo motor body is fixedly mounted on the transverse main plate. The power output end of the main servo motor passes through the transverse main plate and is connected to the drive gear. The transverse main board is located on one side of the drive gear and has two slide rails arranged vertically. The two auxiliary stretching drive units are symmetrically arranged on the slide rails on both sides of the drive gear through slider matching. The forward rack and the reverse rack are respectively movably arranged on the upper and lower sides of the drive gear and mesh with the drive gear. The forward rack and the reverse rack are respectively fixedly connected to the sliders of the auxiliary stretching drive units on both sides of the drive gear. The drive gear drives the forward rack and the reverse rack to drive the two auxiliary stretching drive units to move synchronously in opposite directions. The auxiliary stretching drive unit includes an independent auxiliary servo motor, an auxiliary drive gear connected to the output end of the auxiliary servo motor, and an auxiliary rack meshing with the auxiliary drive gear. The end of the auxiliary rack is provided with a pull claw. The pull claw achieves the film stretching action by controlling the main servo motor and the auxiliary servo motor to drive the pull claw.

[0006] Furthermore, the forward rack and the reverse rack are arranged symmetrically with respect to the center of the drive gear, forming a double-set gear and rack synchronization structure.

[0007] Furthermore, the secondary servo motor operates synchronously in a master-slave follow mode.

[0008] Furthermore, the pull claw is a rod-shaped structure with an arc-shaped cross-section. A guide wheel is provided on the inner side of the pull claw, and a clamping wheel with a position adjustment function is provided on the auxiliary stretching drive unit on the outer side of the pull claw. By adjusting the position of the clamping wheel, the clamping wheel cooperates with the guide wheel to clamp the stretched film.

[0009] Furthermore, the strokes of the main servo motor and the auxiliary servo motor are controlled by parameterized instructions to achieve rectangular film stretching dimensions of different specifications.

[0010] Compared with existing technologies, the advantages of this invention are as follows: The main stretching drive unit of this invention uses a single motor in conjunction with gears and symmetrically arranged forward and reverse racks, achieving rigid mechanical synchronization of the two auxiliary stretching units in the Y direction, fundamentally eliminating asynchrony. The servo motors in this invention offer fast response and precise control, and combined with an optimized transmission structure, they can meet the requirements of high-speed production cycles. By parameterizing the stroke of each servo motor, it can quickly adapt to the film stretching size requirements of different product specifications, and adjustments are convenient. This invention features a compact design, short transmission chain, high rigidity, stable operation, and long service life. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 for Figure 1A magnified view of a portion of region A in the middle.

[0014] Figure 3 This is a schematic diagram showing the position and structure of the main tension drive unit and the auxiliary tension drive unit in this utility model.

[0015] Figure 4 This is a schematic diagram of the main tension drive unit in this utility model.

[0016] Figure 5 This is a schematic diagram of the secondary tension drive unit in this utility model.

[0017] 1 is the frame, 2 is the film stretching assembly, 21 is the main stretching drive unit, 211 is the main servo motor, 212 is the drive gear, 213 is the forward rack, 214 is the reverse rack, 215 is the transverse main board, 216 is the slide rail, 22 is the auxiliary stretching drive unit, 221 is the auxiliary servo motor, 222 is the auxiliary drive gear, 3 is the claw, 4 is the guide wheel, and 5 is the clamping wheel. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments.

[0019] like Figures 1 to 5 As shown, the present invention provides a longitudinal and transverse synchronous film pulling mechanism for a high-speed film rolling machine, which mainly includes a frame 1 and two sets of film pulling components 2 symmetrically mounted on the frame 1.

[0020] Each film stretching assembly 2 includes a main stretching drive unit 21 and two auxiliary stretching drive units 22 driven by the main stretching drive unit 21 and moving synchronously in opposite directions. The core components of the main stretching drive unit 21 include a transverse main board 215, a main servo motor 211, a drive gear 212, a forward rack 213, and a reverse rack 214. The transverse main board 215 is fixed to the frame 1, and the main servo motor 211 is mounted on the transverse main board 215, with its output shaft connected to the drive gear 212. On the upper and lower sides of the drive gear 212, the forward rack 213 and the reverse rack 214 are respectively meshed, and the two are arranged symmetrically with respect to the center of the drive gear 212. A slide rail 216 is provided on the transverse main board 215, and the two auxiliary stretching drive units 22 are mounted on the slide rail 216 by sliders and are fixedly connected to the forward rack 213 and the reverse rack 214 respectively. When the main servo motor 211 drives the gear 212 to rotate, it can drive the forward rack 213 and the reverse rack 214 to perform synchronous reverse linear motion, thereby driving the two auxiliary stretching drive units 22 to move closer or further away synchronously along the Y direction.

[0021] Each secondary stretching drive unit 22 includes a secondary servo motor 221, a secondary drive gear 222, and a secondary rack. The secondary servo motor 221 drives the secondary drive gear 222 to rotate, which in turn drives the secondary rack meshing with the secondary drive gear 222 to move in the X direction. A pull claw 3 is installed at the end of the secondary rack. The pull claw 3 is designed as an arc-shaped rod structure. This arc-shaped cross-section can smoothly contact the film surface, transforming the traditional line contact or point contact into a softer arc surface contact, thereby effectively dispersing contact stress and avoiding scratches or punctures to the film due to stress concentration during high-speed film stretching. A guide wheel 4 is installed on its inner side. An adjustable clamping wheel 5 is also installed on the secondary stretching drive unit 22. By adjusting the clamping wheel 5, it is made to cooperate with the guide wheel 4 to reliably clamp the edge of the film.

[0022] During operation, the control system sends parameterized motion commands to the main servo motor 211 and each auxiliary servo motor 221 according to the preset film size. The four grippers 3 of the two film stretching assemblies 2 first clamp the four corners of the film under the action of the clamping wheels 5 and guide wheels 4. Then, the main servo motor 211 drives the two auxiliary stretching drive units 22 to move synchronously in the Y direction. Simultaneously, each auxiliary servo motor 221 drives the grippers 3 to move in the X direction. Through the combined motion in the X and Y directions, the film is quickly and accurately stretched to the required rectangular size for subsequent film coating processes. The auxiliary servo motors 221 can adopt a master-slave follow control mode to ensure the synchronization of motion between multiple drive points.

[0023] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A longitudinal and transverse synchronous film stretching mechanism for a high-speed film coating machine, characterized in that, The machine includes a frame (1), on which two sets of film stretching assemblies (2) are symmetrically arranged. Each set of film stretching assemblies (2) includes a main stretching drive unit (21) and two auxiliary stretching drive units (22) driven by the main stretching drive unit (21) and moving synchronously in opposite directions. The main stretching drive unit (21) is used to drive the claw to move along the Y direction, and the auxiliary stretching drive units (22) are used to drive the claw to move along the X direction. The main stretching drive unit (21) includes a main servo motor (211), a drive gear (212), a forward rack (213), a reverse rack (214), and a transverse main board (215). The transverse main board (215) is horizontally fixed between the frames (1). The body of the main servo motor (211) is fixedly mounted on the transverse main board (215). The power output end of the main servo motor (211) passes through the transverse main board (215) and is connected to the drive gear (212). The transverse main board (215) is located on one side of the drive gear (212) and has two slide rails (216) arranged vertically. The two auxiliary stretching drive units (22) are symmetrically arranged on the slide rails (216) on both sides of the drive gear (212) by matching sliders. The forward rack (213) and the reverse rack (214) are respectively movably arranged on the upper and lower sides of the drive gear (212) and mesh with the drive gear (212). The forward rack (213) and the reverse rack (214) are respectively fixedly connected to the sliders of the auxiliary stretching drive units (22) on both sides of the drive gear (212). The drive gear (212) drives the forward rack (213) and the reverse rack (214) to drive the two auxiliary stretching drive units (22) to move synchronously in opposite directions. The auxiliary stretching drive unit (22) includes an independent auxiliary servo motor (221), an auxiliary drive gear (222) connected to the output end of the auxiliary servo motor (221), and an auxiliary rack meshing with the auxiliary drive gear (222). The end of the auxiliary rack is provided with a pull claw (3). The film stretching action is realized by controlling the main servo motor (211) and the auxiliary servo motor (221) to drive the pull claw (3).

2. The longitudinal and transverse synchronous film stretching mechanism for a high-speed film coating machine according to claim 1, characterized in that, The forward rack (213) and the reverse rack (214) are arranged symmetrically with respect to the drive gear (212) to form a double-set gear rack synchronous structure.

3. The longitudinal and transverse synchronous film stretching mechanism for a high-speed film coating machine according to claim 1, characterized in that, The secondary servo motor (221) operates synchronously in a master-slave follow mode.

4. A longitudinal and transverse synchronous film stretching mechanism for a high-speed film coating machine according to claim 1, characterized in that, The pull claw (3) is a rod-shaped structure with an arc cross section. A guide wheel (4) is provided on the inner side of the pull claw (3). A clamping wheel (5) with position adjustment function is provided on the auxiliary stretching drive unit (22) on the outer side of the pull claw (3). By adjusting the position of the clamping wheel (5), the clamping wheel (5) cooperates with the guide wheel (4) to clamp the stretched film.

5. A longitudinal and transverse synchronous film stretching mechanism for a high-speed film coating machine according to any one of claims 1 to 4, characterized in that, The strokes of the main servo motor (211) and the auxiliary servo motor (221) are controlled by parameterized instructions to achieve rectangular film stretching dimensions of different specifications.

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