Stretch film feed tension control

Abstract

The utility model discloses a tensile film film feeding tension control device belongs to tensile film production technical field, tensile film film feeding tension control device, including base, fixed on the base support frame and symmetry rotation connection on the support frame through bearing guide roller, install the ratchet wheel of rotation connection with the support frame between the guide roller, one side of the ratchet wheel is provided with the fixed connection of end portion and the support frame pivot, the pivot is rotatably connected with the pawl of engagement with the ratchet wheel, the pawl is welded with the connecting lug, the top of connecting lug is provided with the fixed connection of end portion and the support frame connecting rod, it can make the pawl swing in cooperation pivot under the action of the elastic force of tension spring, make the pawl always engage with the ratchet wheel simultaneously, thereby can effectively prevent the cantilever beam type tension sensor reverse swing under the reverse force of tensile film, has improved the tensioning effect of tensile film.

Description

Technical Field

[0001] This utility model relates to the field of stretch film production technology, and more specifically, to a stretch film feeding tension control device. Background Technology

[0002] Stretch film (also known as wrapping film) is a plastic film with high tensile strength, self-adhesion, and tear resistance. It is mainly used to secure, cover, and protect products during transportation and storage. Its main components are polyethylene (PE) or polypropylene (PP). It achieves tight wrapping through elastic deformation and provides waterproof, dustproof, and anti-scattering functions. After production, the stretch film needs to be rolled up. To prevent loosening during the rolling process, the stretch film is usually tensioned.

[0003] In existing stretch film tension control processes, a motor-driven cantilever beam tension sensor is typically used to swing and detect the tension force of the stretch film while simultaneously tensioning it. However, during the tensioning process, the cantilever beam tension sensor reverses due to the reverse force of the stretch film, resulting in a change in tension and an unsatisfactory tensioning effect. Therefore, we propose a stretch film feeding tension control device to solve the above-mentioned problems. Utility Model Content

[0004] 1. Technical problems to be solved

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide a tension control device for stretch film feeding. Under the action of the elastic force of the tension spring, the pawl can be engaged with the ratchet while it swings in coordination with the rotating shaft. This effectively prevents the cantilever beam tension sensor from swinging in the opposite direction under the reverse force of the stretch film, thereby improving the tensioning effect of the stretch film.

[0006] 2. Technical Solution

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A stretch film feeding tension control device includes a base, a support frame fixed on the base, and guide rollers symmetrically rotatably connected to the support frame via bearings. A ratchet rotatably connected to the support frame is installed between the guide rollers.

[0009] A rotating shaft with its end fixedly connected to the support frame is provided on one side of the ratchet. A pawl that meshes with the ratchet is rotatably connected to the rotating shaft. A connecting lug is welded to the pawl. A connecting rod with its end fixedly connected to the support frame is provided above the connecting lug. A tension spring is installed between the connecting rod and the connecting lug.

[0010] A swing arm is mounted on the middle of the surface of the pawl away from the support frame, and a cantilever beam tension sensor is mounted on the end of the swing arm.

[0011] A control host is mounted above the ratchet.

[0012] Furthermore, the ratchet has an integrally formed shaft end that passes through the support frame, and the shaft end is connected to the support frame via a bearing.

[0013] Furthermore, the power output shaft of the drive motor is connected to the shaft head via a coupling.

[0014] Furthermore, the central axes of the symmetrically arranged guide rollers are located on the same horizontal plane.

[0015] Furthermore, the cantilever beam tension sensor is located below the guide roller.

[0016] Furthermore, the part where the root of the support frame is joined to the base is welded with reinforcing ribs arranged in a right-angled triangular structure, and multiple reinforcing ribs are arranged at equal intervals.

[0017] Furthermore, the output end of the cantilever beam tension sensor is electrically connected to the input end of the control host, and the output end of the control host is electrically connected to the input end of the drive motor.

[0018] 3. Beneficial effects

[0019] Compared with existing technologies, the advantages of this utility model are:

[0020] (1) In this scheme, the power output end of the drive motor drives the ratchet to rotate, thereby driving the swing arm to press down the cantilever beam tension sensor to press down the stretching film to make it tension. Under the action of the elastic force of the tension spring, the pawl is always engaged with the ratchet while it swings with the rotating shaft. This can effectively prevent the cantilever beam tension sensor from swinging in the opposite direction under the reverse force of the stretching film, thus improving the tensioning effect of the stretching film.

[0021] (2) In this scheme, by using the control host to set a suitable tension range value for the cantilever beam tension sensor, and by controlling the drive motor through the control host to make the cantilever beam tension sensor tension the stretching membrane within the set tension range value, the accuracy of tension control is guaranteed. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a structural schematic diagram of the present invention from another perspective;

[0024] Figure 3 This is a schematic diagram of the ratchet structure of this utility model;

[0025] Figure 4 This is a schematic diagram of the cantilever beam tension sensor structure of this utility model.

[0026] Explanation of the labels in the diagram:

[0027] 1. Base; 2. Support frame; 3. Guide roller; 4. Ratchet; 5. Shaft head; 6. Drive motor; 7. Rotating shaft; 8. Pawl; 9. Connecting ear; 10. Connecting rod; 11. Tension spring; 12. Swing arm; 13. Cantilever beam tension sensor; 14. Reinforcing rib; 15. Control host. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0029] Example:

[0030] Please see Figure 1-4 The stretch film feeding tension control device includes a base 1, a support frame 2 fixed on the base 1, and guide rollers 3 symmetrically rotated on the support frame 2 via bearings. A ratchet 4 rotatably connected to the support frame 2 is installed between the guide rollers 3.

[0031] A rotating shaft 7 with its end fixedly connected to the support frame 2 is provided on one side of the ratchet 4. A pawl 8 that meshes with the ratchet 4 is rotatably connected to the rotating shaft 7. A connecting ear 9 is welded to the pawl 8. A connecting rod 10 with its end fixedly connected to the support frame 2 is provided above the connecting ear 9. A tension spring 11 is installed between the connecting rod 10 and the connecting ear 9.

[0032] A swing arm 12 is installed on the middle part of the surface of the pawl 8 away from the support frame 2, and a cantilever beam tension sensor 13 is installed at the end of the swing arm 12.

[0033] The control host 15 is mounted above the ratchet 4;

[0034] It should be noted that, in use, the stretch film feeding tension control device sets a suitable tension range value for the cantilever beam tension sensor 13 using the control host 15, then winds the processed stretch film from the first guide roller 3 onto the cantilever beam tension sensor 13, then onto the second guide roller 3, and finally winds it up using the winding device. The power output end of the drive motor 6 drives the ratchet 8 to rotate, thereby driving the swing arm 12 to press down the cantilever beam tension sensor 13 to tighten the stretch film. Under the elastic force of the tension spring 11, the pawl 4, while swinging in conjunction with the rotating shaft 7, keeps the pawl 4 engaged with the ratchet 8, thus effectively preventing the cantilever beam tension sensor 13 from swinging in the opposite direction under the reverse force of the stretch film, thereby improving the tensioning effect of the stretch film.

[0035] like Figure 2 , Figure 3 As shown, the ratchet 4 has an integrally formed shaft head 5 that passes through the support frame 2, and the shaft head 5 is connected to the support frame 2 through a bearing. The power output shaft of the drive motor 6 is connected to the shaft head 5 through a coupling.

[0036] It should be noted that the resistance of ratchet 4 during rotation has been reduced, and the power output of drive motor 6 can be normally transmitted to ratchet 4.

[0037] like Figure 1 As shown, the central axes of the symmetrically arranged guide rollers 3 are located on the same horizontal plane, and the cantilever beam tension sensor 13 is located below the guide rollers 3;

[0038] It should be noted that this is beneficial for the cantilever beam tension sensor 13 to press down on the stretching membrane and make it taut.

[0039] like Figure 1 As shown, the support frame 2 is welded to the base 1 at the joint with the base 1 with a reinforcing rib 14 arranged in a right-angled triangle structure, and multiple reinforcing ribs 14 are arranged at equal intervals.

[0040] It should be noted that by setting the reinforcing rib 14, the structural strength of the joint between the support frame 2 and the base 1 can be effectively improved, and the load-bearing capacity of the support frame 2 can be increased.

[0041] like Figure 1 , Figure 2 As shown, the output terminal of the cantilever beam tension sensor 13 is electrically connected to the input terminal of the control host 15, and the output terminal of the control host 15 is electrically connected to the input terminal of the drive motor 6.

[0042] It should be noted that by using the control host 15 to set a suitable tension range value for the cantilever beam tension sensor 13, and by controlling the drive motor 6 through the control host 15, the cantilever beam tension sensor 13 is made to tension the stretching membrane within the set tension range value.

[0043] In use: By using the control host 15 to set a suitable tension range value for the cantilever beam tension sensor 13, the processed stretch film is then wound from the first guide roller 3 onto the cantilever beam tension sensor 13, and then wound onto the second guide roller 3. Finally, it is wound up by the winding device. By controlling the power output end of the drive motor 6 to drive the ratchet 8 to rotate, the swing arm 12 drives the cantilever beam tension sensor 13 to press down on the stretch film to make it tensile. Under the action of the elastic force of the tension spring 11, the pawl 4 swings in conjunction with the rotating shaft 7, and the pawl 4 is always engaged with the ratchet 8, which can effectively prevent the cantilever beam tension sensor 13 from swinging in the opposite direction under the reverse force of the stretch film.

[0044] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A tension control device for stretch film feeding, comprising a base (1), a drive motor (6), a support frame (2) fixed on the base (1), and a guide roller (3) symmetrically rotatably connected to the support frame (2) via bearings, characterized in that: A ratchet (4) is installed between the guide rollers (3) and is rotatably connected to the support frame (2). A rotating shaft (7) with its end fixedly connected to the support frame (2) is provided on one side of the ratchet (4). A pawl (8) that meshes with the ratchet (4) is rotatably connected to the rotating shaft (7). A connecting ear (9) is welded to the pawl (8). A connecting rod (10) with its end fixedly connected to the support frame (2) is provided above the connecting ear (9). A tension spring (11) is installed between the connecting rod (10) and the connecting ear (9). A swing arm (12) is installed on the middle of the surface of the pawl (8) away from the support frame (2), and a cantilever beam tension sensor (13) is installed at the end of the swing arm (12). The control host (15) is mounted above the ratchet (4).

2. The tension control device for stretch film feeding according to claim 1, characterized in that: The ratchet (4) has an integrally formed shaft head (5) that passes through the support frame (2), and the shaft head (5) is connected to the support frame (2) through a bearing.

3. The tension control device for stretch film feeding according to claim 2, characterized in that: The power output shaft of the drive motor (6) is connected to the shaft head (5) via a coupling.

4. The tension control device for stretch film feeding according to claim 1, characterized in that: The central axes of the symmetrically arranged guide rollers (3) are located on the same horizontal plane.

5. The tension control device for stretch film feeding according to claim 1, characterized in that: The cantilever beam tension sensor (13) is located below the guide roller (3).

6. The tension control device for stretch film feeding according to claim 1, characterized in that: The support frame (2) is welded to the base (1) at the joint with the base, and a reinforcing rib (14) is arranged in a right-angled triangle structure, and multiple reinforcing ribs (14) are arranged at equal intervals.

7. The tension control device for stretch film feeding according to claim 1, characterized in that: The output end of the cantilever beam tension sensor (13) is electrically connected to the input end of the control host (15), and the output end of the control host (15) is electrically connected to the input end of the drive motor (6).

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