Stretching film pre-tightening device of stretching film packaging machine

Abstract

The utility model discloses a stretch film pre-tightening device of a stretch film packaging machine, which belongs to the technical field of stretch film packaging machines and comprises a base, a positioning plate welded on the base and a stretch film pre-tightening mechanism positioned on the positioning plate, a steering shaft is mounted on the positioning plate, the positioning plate is connected with a support through the steering shaft, and the support is connected with the stretch film pre-tightening mechanism. A fixing sleeve seat is welded to one end of the support, an upper supporting shaft is rotationally connected to the top wall of the fixing sleeve seat, a wheel disc is fixedly installed on the outer side of the upper supporting shaft, an inner moving chamber is formed in the position, below the wheel disc, in the fixing sleeve seat, and two bevel gears meshed with each other are arranged in the inner moving chamber. The two bevel gears are both coaxially connected with an inner fulcrum shaft, one inner fulcrum shaft is coaxially connected with the upper fulcrum shaft, and the other inner fulcrum shaft is coaxially connected with a screw rod. According to the stretching film pre-tightening device of the stretching film packaging machine, external tools are not needed for pre-tightening the stretching film, parts do not need to be disassembled either, and therefore operation is easy and convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of stretch film packaging machines, in particular to a stretch film pre-tightening device of a stretch film packaging machine. Background Art

[0002] The stretch film packaging machine is a packaging machine that realizes mechanized film wrapping instead of manual wax wrapping. It uses shrink film to wrap the outside of the product or package. After heating, the shrink film shrinks and wraps the product or package tightly, so that the appearance of the product can be fully displayed after the product is packaged.

[0003] In the process of realizing the utility model, the inventor found that there are at least the following problems in this technology: the stretch film packaging machine has an important structure, which is the pre-tightening device, which is used to realize the pre-tightening of the stretch film. However, the current pre-tightening device usually needs to adjust the position of the pre-tightening sleeve (used to allow the stretch film to pass through) during operation. At present, it is necessary to use external tools or disassemble the corresponding parts to adjust the position of the pre-tightening sleeve. For example, the patent with application number CN202020915889.7 in the prior art - a stretch film pre-tightening device for a stretch film packaging machine, which adjusts the pre-tightening force on the stretch film by replacing springs with different elastic coefficients, and needs to repeatedly install and disassemble the springs, which is cumbersome to operate and time-consuming and laborious to adjust.

[0004] To this end, we propose a stretch film pre-tightening device for a stretch film packaging machine to solve the above problems. Utility Model Content

[0005] The main purpose of the utility model is to provide a stretch film pre-tightening device for a stretch film packaging machine, which does not require external tools or disassembly of parts for pre-tightening the stretch film, resulting in simple and convenient operation and effectively solving the problems in the background technology.

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

[0007] A stretch film pre-tightening device for a stretch film packaging machine comprises a base, a positioning plate welded on the base and a stretch film pre-tightening mechanism located on the positioning plate, a steering shaft is installed on the positioning plate, and the positioning plate is connected to a bracket via the steering shaft, wherein a fixed sleeve is welded at one end of the bracket, an upper support shaft is rotatably connected to the top wall of the fixed sleeve, and a wheel disc is fixedly installed on the outer side of the upper support shaft;

[0008] An inner movable chamber is formed inside the fixed sleeve and below the wheel disc, and two mutually meshing bevel gears are arranged in the inner movable chamber. An inner support shaft is coaxially connected to each of the two bevel gears, one of the inner support shafts is coaxially connected to the upper support shaft, and the other inner support shaft is coaxially connected to a screw rod. The stretch film pre-tightening mechanism includes a sliding rod threadedly sleeved on the screw rod and a pre-tightening sleeve installed on the side of the sliding rod facing away from the fixed sleeve seat, and a side slide groove is formed on the side of the fixed sleeve seat facing away from the bracket, wherein the sliding rod is in contact with the inner wall of the side slide groove, so that the sliding rod can be driven to translate along the inner wall of the side slide groove when the screw rod is running.

[0009] As a preferred embodiment, the two inner support shafts are both located in the inner movable chamber, and the two inner support shafts are rotatably connected to the fixed sleeve seat, so that the two inner support shafts and the bevel gears thereon can operate stably.

[0010] As a preferred embodiment, the screw is horizontally arranged in the side slide groove, and the screw is rotatably connected to the fixed sleeve seat, so that the structure of the screw is more stable.

[0011] As a preferred embodiment, a spring is fixedly connected to one side of the top wall of the fixed sleeve, wherein an insertion rod is welded above the spring; the top of the insertion rod is rod-shaped and vertically arranged.

[0012] As a preferred embodiment, a plurality of positioning holes are drilled in the wheel disc in a vertical direction and distributed in a circular array along its axis, and the top of the insertion rod slides through one of the positioning holes on the wheel disc, so that the insertion rod can fix the position of the wheel disc.

[0013] In summary, the technical effects and advantages of the utility model are as follows:

[0014] The stretch film pre-tightening device of the stretch film packaging machine drives the two bevel gears to operate by rotating the wheel disc, so that the screw rod rotates and drives the slide bar to extend and retract in the fixed sleeve seat, so as to adjust the position of the pre-tightening sleeve disc, thereby realizing the pre-tightening operation of the stretch film to make it tighter. The rotation of the wheel disc is easy and convenient, and does not require the help of external tools or the disassembly of parts, resulting in simple and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a vertical cross-sectional view of the utility model;

[0017] Figure 3 For this utility model Figure 1 A magnified view of the structure at center;

[0018] Figure 4 For this utility model Figure 2 Enlarged view of the structure at point B in the middle.

[0019] In the figure: 1. base; 2. positioning plate; 3. steering shaft; 4. bracket; 5. fixed sleeve; 6. upper support shaft; 7. wheel disc; 8. inner movable chamber; 9. bevel gear; 10. inner support shaft; 11. side slide groove; 12. screw; 13. slide rod; 14. preload sleeve; 15. spring; 16. plug rod; 17. positioning hole. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Reference Figure 1-Figure 4 A stretch film pre-tightening device for a stretch film packaging machine comprises a base 1, a positioning plate 2 welded to the base 1 and a stretch film pre-tightening mechanism located on the positioning plate 2, a steering shaft 3 is mounted on the positioning plate 2, and the positioning plate 2 is connected to a bracket 4 via the steering shaft 3, wherein a fixed sleeve 5 is welded to one end of the bracket 4, an upper support shaft 6 is rotatably connected to the top wall of the fixed sleeve 5, and a wheel disc 7 is fixedly mounted on the outer side of the upper support shaft 6;

[0022] An inner movable chamber 8 is formed inside the fixed sleeve 5 and below the wheel disc 7. Two mutually meshing bevel gears 9 are arranged in the inner movable chamber 8. An inner support shaft 10 is coaxially connected to each of the two bevel gears 9. The two inner support shafts 10 are both located in the inner movable chamber 8, and the two inner support shafts 10 are rotatably connected to the fixed sleeve 5, so that the two inner support shafts 10 and the bevel gears 9 thereon can operate stably.

[0023] One of the inner support shafts 10 is coaxially connected to the upper support shaft 6, and the other inner support shaft 10 is coaxially connected to a screw rod 12. The stretch film pre-tightening mechanism includes a slide rod 13 threadedly sleeved on the screw rod 12 and a pre-tightening sleeve 14 installed on the side of the slide rod 13 facing away from the fixed sleeve seat 5. A side slide groove 11 is formed on the side of the fixed sleeve seat 5 facing away from the bracket 4. The screw rod 12 is horizontally arranged in the side slide groove 11, and the screw rod 12 is rotatably connected to the fixed sleeve seat 5, so that the structure of the screw rod 12 is more stable, wherein the slide rod 13 is in contact with the inner wall of the side slide groove 11, so that when the screw rod 12 is running, it can drive the slide rod 13 to translate along the inner wall of the side slide groove 11;

[0024] It is worth noting that a spring 15 is fixedly connected to one side of the top wall of the fixed sleeve 5, wherein a plug rod 16 is welded above the spring 15, the top of the plug rod 16 is in the shape of a rod and is vertically arranged, and a plurality of positioning holes 17 distributed in a circular array along the axis thereof are drilled in the vertical direction on the wheel disc 7, and the top of the plug rod 16 slides through one of the positioning holes 17 on the wheel disc 7, so that the plug rod 16 can fix the position of the wheel disc 7.

[0025] The stretch film pre-tightening device of the stretch film packaging machine: during operation, if the stretch film needs to be tightened, the rod 16 can be squeezed first to disengage the rod 16 from the wheel disc 7, and then the wheel disc 7 is manually rotated by a person to drive the upper support shaft 6 to operate, thereby driving the two bevel gears 9 and the two inner support shafts 10 in the inner activity chamber 8 to operate, so that the screw 12 operates accordingly, and drives the slide rod 13 to translate in the side slide groove 11, so as to adjust the pre-tightening sleeve 14, realize the pre-tightening operation of the stretch film, and make it tighter (after completing the pre-tightening operation, the top of the rod 16 needs to be reinserted into one of the positioning holes 17 to fix the wheel disc 7), and the rotation of the wheel disc 7 is easy and convenient, and does not require the use of external tools or the disassembly of parts.

[0026] 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 stretch film pre-tightening device for a stretch film packaging machine, comprising a base (1), a positioning plate (2) welded to the base (1), and a stretch film pre-tightening mechanism located on the positioning plate (2), characterized in that: A steering shaft (3) is installed on the positioning plate (2), and the positioning plate (2) is connected to a bracket (4) via the steering shaft (3), wherein a fixing sleeve (5) is welded to one end of the bracket (4), an upper support shaft (6) is rotatably connected to the top wall of the fixing sleeve (5), and a wheel disc (7) is fixedly installed on the outer side of the upper support shaft (6); An inner movable chamber (8) is formed inside the fixed sleeve (5) below the wheel disc (7), and two mutually meshing bevel gears (9) are arranged inside the inner movable chamber (8). An inner support shaft (10) is coaxially connected to each of the two bevel gears (9), one of the inner support shafts (10) is coaxially connected to the upper support shaft (6), and the other inner support shaft (10) is coaxially connected to a screw rod (12). The stretch film pre-tightening mechanism includes a slide rod (13) threadedly sleeved on the screw rod (12) and a pre-tightening sleeve (14) installed on the side of the slide rod (13) facing away from the fixed sleeve (5). A side slide groove (11) is formed on the side of the fixed sleeve (5) facing away from the bracket (4), and the slide rod (13) is in contact with the inner wall of the side slide groove (11).

2. The stretch film pre-tightening device of a stretch film packaging machine according to claim 1, characterized in that: The two inner support shafts (10) are both located in the inner activity chamber (8), and the two inner support shafts (10) are both rotatably connected to the fixed sleeve (5).

3. The stretch film pre-tightening device of a stretch film packaging machine according to claim 1, characterized in that: The screw rod (12) is horizontally arranged in the side sliding groove (11), and the screw rod (12) is rotationally connected to the fixed sleeve (5).

4. The stretch film pre-tightening device of a stretch film packaging machine according to claim 1, characterized in that: A spring (15) is fixedly connected to one side of the top wall of the fixed sleeve (5), wherein an insert rod (16) is welded above the spring (15).

5. The stretch film pre-tightening device of a stretch film packaging machine according to claim 4, characterized in that: The wheel disc (7) is drilled with a plurality of positioning holes (17) in a vertical direction and distributed in a circumferential array along its axis, and the top of the plunger (16) slides through one of the positioning holes (17) on the wheel disc (7).

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