Unwinding and tensioning adjusting mechanism for plastic packaging film

Abstract

The utility model discloses an unwinding, tensioning and adjusting mechanism for a plastic packaging film, which belongs to the technical field of plastic packaging film mounting equipment and is characterized in that self-deflection components positioned on two sides of a rack are pushed to deflect by utilizing the gravity of a balancing weight, so that two tensioning rollers are driven to synchronously and centrifugally move in opposite directions by taking a deflection axis as a center; the packaging film is wound around the top of the upper tensioning roller and passes through the bottom of the lower tensioning roller, finally, the function of tensioning the packaging film for a long length in a small-space tensioning station can be achieved, and in addition, due to the design of the two tensioning rollers, the effects of small balance weight and symmetrical buffering and tensioning can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic packaging film installation equipment, in particular to an unwinding and tensioning adjustment mechanism for plastic packaging film. Background Art

[0002] During the unwinding process of plastic packaging film on the production line, the film roll released by the unwinding roller often deviates from the material on the packaging side, causing the intermediate film material to become loose and the tensioning force to be poor. This redundant film material section should not be too long, as it can easily cause deviation in the feeding length and overlap on the packaging side.

[0003] To overcome the above problems, the existing means is to install a tensioning roller on the frame in the length direction of the packaging film transmission. The tensioning roller is arranged along the horizontal direction of the packaging film, and the two ends are pushed by elastic telescopic parts to squeeze the packaging film, so as to eliminate loose and redundant packaging film by driving the packaging film to be concave or bulge.

[0004] However, in actual application, it was found that there are at least two problems with the method of directly pushing the tensioning roller through the elastic telescopic part. First, the length of the relaxed packaging film that can be eliminated is limited due to the comprehensive influence of the workstation space; second, when the relaxed length of the packaging film is small, the elastic force applied by the tensioning roller on the packaging film is too large, which will cause the packaging film to deform, and manual assistance is required in this process. Utility Model Content

[0005] The utility model aims to solve the problems of limited tensioning length and easy deformation of the packaging film in the initial stage of tensioning force in the traditional packaging film tensioning mechanism, and proposes a plastic packaging film unwinding tensioning adjustment mechanism.

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

[0007] A plastic packaging film unwinding tensioning adjustment mechanism is installed on the lower station side of the film rolling station included in the frame. The film rolling station is equipped with a packaging film material roll. The tensioning adjustment mechanism includes two tensioning rollers and a self-deflecting assembly that can adaptively deflect and is installed on both sides of the frame. The self-deflecting assembly is also equipped with a counterweight block. The self-deflecting assembly cooperates with the two tensioning rollers and drives the two tensioning rollers to perform reverse synchronous centrifugal movement around the deflection axis as the center under the action of the counterweight block. The packaging film bypasses the top of the upper tensioning roller and passes through the bottom of the lower tensioning roller.

[0008] As a further description of the above technical solution:

[0009] The front and rear sides of the frame are symmetrically provided with fixed shafts, and the side plates of the frame are also provided with two limit grooves, and the two ends of the tensioning roller slide through the limit grooves.

[0010] As a further description of the above technical solution:

[0011] The self-deflecting assembly comprises a deflecting seat rotatably mounted on a fixed shaft. Two telescopic parts are symmetrically mounted on the deflecting seat. The free ends of the telescopic parts are rotatably connected to the ends of the tensioning rollers.

[0012] As a further description of the above technical solution:

[0013] The deflection seat is connected with a slide, and the slide extends toward the tensioning roller located below. The slide is equipped with a slide groove through which a slide seat is arranged, and a bolt for sliding locking is also installed on the slide seat.

[0014] As a further description of the above technical solution:

[0015] A counterweight is installed on the slide seat.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0017] By utilizing the gravity of the counterweight block to push the self-deflection components on both sides of the frame to deflect, the two tensioning rollers are driven to move synchronously in the opposite direction with the deflection axis as the center. The packaging film bypasses the top of the upper tensioning roller and passes through the bottom of the lower tensioning roller, ultimately achieving the function of tensioning the packaging film over a long length in a tensioning station in a small space. In addition, the design of the double tensioning rollers can achieve the effect of small counterweight and symmetrical buffer tensioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of the tensioning mechanism assembly provided according to an embodiment of the utility model is shown;

[0019] Figure 2 Shows a front view of the tensioning mechanism provided according to an embodiment of the utility model;

[0020] Figure 3 A local enlarged view provided according to an embodiment of the utility model is shown.

[0021] Legend:

[0022] 10. Frame; 11. Fixed shaft; 12. Limiting groove; 10a. Film roll station;

[0023] 20. Tension roller;

[0024] 30. self-deflection assembly; 31. deflection seat; 32. slide; 321. slide slot; 33. slide seat; 331. bolt; 34. telescopic member;

[0025] 40. Counterweight. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] like Figure 1-Figure 3 As shown, taking into account the station installation situation of the frame 10, the tension adjustment mechanism is installed at the lower station of the film roll station 10a. Specifically, the tension adjustment mechanism includes two tension rollers 20 and a self-deflecting assembly 30 that can adaptively deflect and is mounted on both sides of the frame 10. The front and rear sides of the frame 10 are symmetrically provided with fixed shafts 11. The side panels of the frame 10 are also provided with two limit grooves 12. Both ends of the tension roller 20 slide through the limit grooves 12. The two limit grooves 12 rotate 180 degrees about the deflection axis to overlap. The self-deflecting assembly 30 is also equipped with a counterweight block 40. The self-deflecting assembly 30 cooperates with the two tension rollers 20 and under the action of the counterweight block 40, the self-deflecting assembly 30 can be adjusted. The two tensioning rollers 20 are driven to perform reverse synchronous centrifugal movement with the deflection axis as the center, and the packaging film bypasses the top of the upper tensioning roller 20 and passes through the bottom of the lower tensioning roller 20. The gravity of the counterweight block 40 is used to push the self-deflection assembly 30 on both sides of the frame 10 to deflect, thereby driving the two tensioning rollers 20 to perform reverse synchronous centrifugal movement with the deflection axis as the center, and the packaging film bypasses the top of the upper tensioning roller 20 and passes through the bottom of the lower tensioning roller 20, finally realizing the function of tensioning the packaging film over a long length in a tensioning station in a small space. In addition, the design of the double tensioning rollers can achieve the effect of small counterweight and symmetrical buffer tensioning.

[0028] In further detail, the limiting groove 12 is arc-shaped.

[0029] like Figure 1-Figure 3 As shown, the self-deflection assembly 30 includes a deflection seat 31 rotatably mounted on the fixed shaft 11, a limiting nut is also installed on the fixed shaft 11, and two telescopic members 34 are symmetrically mounted on the deflection seat 31. The telescopic member 34 is a telescopic rod, and the free end of the telescopic member 34 is rotatably connected to the end of the tensioning roller 20 through a shaft sleeve.

[0030] In further detail, the deflection seat 31 is connected to a slide 32, and the slide 32 extends toward the tensioning roller 20 located below. The slide 32 is equipped with a slide seat 33 by providing a slide groove 321. The slide seat 33 is also equipped with a bolt 331 for sliding locking. A counterweight 40 is installed on the slide seat 33. By controlling the horizontal distance of the slide seat 33 relative to the deflection axis, the deflection torque generated by the counterweight 40 on the deflection seat 31 can be controlled, that is, the tension of the tensioning roller 20 on the packaging film in the initial state is controlled. In the process of increasing the slack length of the packaging film, the deflection arm becomes smaller, the deflection torque becomes smaller, that is, the tension of the tensioning roller becomes smaller, and no deformation damage is caused to the packaging film. At the same time, in this process, the transmission direction of the packaging film can be adaptively changed to eliminate loose and redundant packaging film and ensure the tension of the packaging film on the packaging side.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A plastic packaging film unwinding tensioning adjustment mechanism, mounted on the lower station side of a film roll station (10a) included in a frame (10), wherein a packaging film roll is installed at the film roll station (10a), characterized in that: The tension adjustment mechanism comprises two tension rollers (20) and a self-deflecting assembly (30) which is mounted on both sides of a frame (10) and can self-adaptively deflect. A counterweight (40) is also mounted on the self-deflecting assembly (30). The self-deflecting assembly (30) cooperates with the two tension rollers (20) and drives the two tension rollers (20) to perform reverse synchronous centrifugal movement around a deflection axis under the action of the counterweight (40), so that the packaging film passes around the top of the upper tension roller (20) and passes through the bottom of the lower tension roller (20).

2. The unwinding tensioning adjustment mechanism for a plastic packaging film according to claim 1, characterized in that: The front and rear sides of the frame (10) are symmetrically provided with fixed shafts (11), and the side plates of the frame (10) are also provided with two limiting grooves (12), and the two ends of the tensioning roller (20) slide through the limiting grooves (12).

3. The unwinding tensioning adjustment mechanism for a plastic packaging film according to claim 2, characterized in that: The self-deflecting assembly (30) comprises a deflecting seat (31) rotatably mounted on a fixed shaft (11). Two telescopic members (34) are symmetrically mounted on the deflecting seat (31). The free ends of the telescopic members (34) are rotatably connected to the ends of the tensioning rollers (20).

4. The unwinding tensioning adjustment mechanism for a plastic packaging film according to claim 3, characterized in that: The deflection seat (31) is connected to a slide (32), the slide (32) extends toward the tensioning roller (20) located below, the slide (32) is provided with a slide groove (321) to fit a slide seat (33), and a bolt (331) for sliding locking is also installed on the slide seat (33).

5. The unwinding tensioning adjustment mechanism for a plastic packaging film according to claim 4, characterized in that: A counterweight (40) is mounted on the sliding seat (33).

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