Shrinkage film trowelling device of packaging box shrinkage film machine

Abstract

The utility model provides a shrink film trowelling device of a packaging box shrink film machine, and relates to the technical field of packaging machinery, the shrink film trowelling device comprises an extrusion conveyor belt set arranged at an outlet of the shrink film machine, the extrusion conveyor belt set comprises two conveyor belt assemblies which are oppositely arranged, each conveyor belt assembly comprises a mounting rack and a pair of transmission rollers mounted on the mounting rack, and the conveying belt is sleeved on the driving rollers. The axis direction of the transmission rollers is vertically arranged. The conveying direction of the conveying belt is the same as the outlet direction of the film shrinking machine. And at least one of the pair of transmission rollers is a driving roller. The conveying belts are made of soft materials, the thickness of each conveying belt is larger than the distance between the round corner circle center of the packaging box and the side edge of the packaging box, and the distance between the conveying belts on the two conveying belt assemblies is smaller than the distance between the round corner circle centers of the two sides of the packaging box. The device can effectively flatten protrusions at the four corners of a packaging box and quickly cool and shape the packaging box when a thermal shrinkage film is not completely cooled, so that the appearance quality of a product is improved.

Description

Technical Field

[0001] This utility model relates to the field of packaging machinery technology, specifically to a shrink-film smoothing device for a packaging box shrink-film machine. Background Technology

[0002] Product packaging plays a vital role in modern industrial production. Among these, heat shrink film packaging is widely used for the outer packaging of food, pharmaceuticals, and daily necessities due to its advantages such as dustproofing, moisture protection, and aesthetic appeal. Especially in the boxed packaging sector, heat shrink film not only protects the product but also enhances its appearance.

[0003] In existing technologies, the heat shrink packaging process for packaging boxes typically involves placing the box within a heat shrink film and then heating it to shrink the film and cover the box surface. However, during the heat shrinking process, due to the material properties of the heat shrink film and the uneven distribution of shrinkage stress, protrusions often form at the four corners of the box. These protrusions harden after cooling, not only affecting the overall aesthetics of the product but also potentially scratching consumers' skin, resulting in a poor user experience. More seriously, this situation can lead to consumer complaints, damaging the product's market reputation and the company's image. Utility Model Content

[0004] The purpose of this utility model is to provide a shrink film smoothing device for a packaging box shrink film machine, which can effectively solve the problem of protrusions at the four corners of the film, ensuring the aesthetics of the product and improving the user experience for consumers.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] A shrink-film smoothing device for a packaging box shrink-film machine includes an extrusion conveyor belt assembly disposed at the outlet of the shrink-film machine. The extrusion conveyor belt assembly includes two oppositely disposed conveyor belt components. Each conveyor belt component includes a mounting frame, a pair of drive rollers mounted on the mounting frame, and a conveyor belt sleeved on the drive rollers. The axis of the drive rollers is vertical, and the conveying direction of the conveyor belt is the same as the outlet direction of the shrink-film machine. At least one of the pair of drive rollers is a drive roller.

[0007] The conveyor belt is made of a flexible material, and its thickness is greater than the distance between the center of the rounded corner of the packaging box and the side of the packaging box. The distance between the conveyor belts on the two conveyor belt assemblies is less than the distance between the centers of the rounded corners on both sides of the packaging box.

[0008] Furthermore, the transmission belt is made of polyurethane.

[0009] Furthermore: of the pair of drive rollers, one is a driving roller and the other is a driven roller.

[0010] Furthermore, the passive roller is mounted on a mounting frame via a mounting shaft. The mounting frame has a slotted hole, and the mounting shaft is installed within the slotted hole, with the direction of the slotted hole parallel to the conveyor belt assembly's conveying direction. The passive roller's installation via the mounting shaft within the slotted hole facilitates adjustment of the conveyor belt tension, improving the adaptability and reliability of the device.

[0011] Furthermore, it also includes an active cooling station, which is located on one side of the extrusion conveyor belt group in the conveying direction. The active cooling station includes a roller conveyor belt and a cooling pipe mounted above the roller conveyor belt. The cooling pipe is equipped with a ventilation pipe that is connected to a cold air source. The cooling pipe has several air outlets facing the roller conveyor belt.

[0012] Furthermore: the conveyor rollers on the roller conveyor belt are ball bearings, and the length of the roller conveyor belt is the same as the length of the packaging box.

[0013] Furthermore, the shrink wrapping machine is equipped with a funnel-shaped guide plate at the outlet, with the smaller opening of the funnel facing the extrusion conveyor belt. This guides the packaging boxes smoothly into the extrusion conveyor belt, improving production efficiency and reducing equipment failure rate.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] I. This utility model sets up an extrusion conveyor belt group at the outlet of the shrink film machine. By using two oppositely arranged conveyor belt assemblies to extrude and convey the packaging box, it can effectively flatten the protrusions at the four corners of the packaging box before the heat shrink film has completely cooled down. This solves the technical problem of protrusions at the four corners of the heat shrink film in the prior art and significantly improves the appearance of the product.

[0016] Second, the conveyor belt in the extrusion belt assembly is made of a soft material, and the thickness of the conveyor belt is greater than the distance between the center of the rounded corner of the packaging box and the side of the packaging box. The distance between the two conveyor belts is less than the distance between the center of the rounded corners on both sides of the packaging box. This structural design allows the conveyor belt to effectively cover the side of the packaging box, ensuring sufficient extrusion of the four corners of the heat shrink film and improving the smoothing effect.

[0017] Third, this utility model has an active cooling station set at the exit end of the extrusion conveyor belt group. The extruded packaging box is quickly cooled through the air outlet of the cooling pipe, which can solidify the flattened heat shrink film in time, prevent it from rebounding and deforming, and further ensure the appearance quality of the product. Attached Figure Description

[0018] Figure 1 This is a top view schematic diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the front view of the cooling pipe;

[0020] Figure 3 for Figure 1 A schematic left view of the conveyor belt assembly;

[0021] In the picture:

[0022] 1. Shrink film machine outlet; 2. Packaging box; 3. Conveyor belt assembly; 3.1. Conveyor belt; 3.2. Mounting frame; 3.21. Waist-shaped hole; 3.3. Drive roller; 3.4. Passive roller; 4. Active cooling station; 4.1. Roller conveyor belt; 4.2. Cooling pipe; 4.21. Air outlet. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] like Figure 1 As shown: The shrinking and smoothing device of the packaging box shrinking machine provided by this utility model is located at the outlet 1 of the shrinking machine and mainly includes an extrusion conveyor belt group. The extrusion conveyor belt group consists of two oppositely arranged conveyor belt assemblies 3. Each conveyor belt assembly 3 includes a mounting frame 3.2, a pair of drive rollers mounted on the mounting frame 3.2, and a conveyor belt 3.1 sleeved on the drive rollers. The axis of the drive rollers is vertically arranged, and the conveying direction of the conveyor belt 3.1 is consistent with the direction of the outlet 1 of the shrinking machine.

[0026] In each conveyor belt assembly 3, the drive roller at the end furthest from the shrink-film machine outlet 1 is the active roller 3.3, which drives the conveyor belt 3.1 via a motor; the drive roller at the other end is the passive roller 3.4. The passive roller 3.4 is mounted on a mounting frame 3.2 via a mounting shaft. The mounting frame 3.2 has an oblong hole 3.21, and the mounting shaft is installed in the oblong hole 3.21. The direction of the oblong hole 3.21 is parallel to the conveying direction of the conveyor belt assembly 3. This design facilitates the adjustment of the tension of the conveyor belt 3.1, ensuring that it always maintains optimal working condition.

[0027] The conveyor belt 3.1 is made of a soft material, preferably polyurethane, which has good elasticity and wear resistance. The thickness of the conveyor belt 3.1 is designed to be greater than the distance between the center of the rounded corner of the packaging box 2 and the side of the packaging box 2, while the distance between the conveyor belts 3.1 on the two conveyor belt assemblies 3 is designed to be less than the distance between the centers of the rounded corners on both sides of the packaging box 2. This dimensional fit allows the conveyor belt 3.1 to exert effective compressive force on the sides of the packaging box 2, thereby flattening the protrusions at the four corners of the heat shrink film.

[0028] An active cooling station 4 is located on one side of the extrusion conveyor belt assembly in the conveying direction. The active cooling station 4 includes a roller conveyor belt 4.1 and a cooling pipe 4.2 positioned above it. The cooling pipe 4.2 has a ventilation pipe connected to a cold air source, and multiple air outlets 4.21 are located on the side facing the roller conveyor belt 4.1 to spray cold air onto the extruded packaging boxes 2, achieving rapid cooling and curing. The conveyor rollers on the roller conveyor belt 4.1 are ball bearings 3.4, and the length of the roller conveyor belt 4.1 is the same as the length of the packaging box 2, ensuring that the packaging box 2 at the active cooling station 4 can be pushed out by the next packaging box 2 to the next process step.

[0029] A funnel-shaped guide plate is provided at the outlet 1 of the shrinking machine, with its larger opening facing the outlet 1 of the shrinking machine and its smaller opening facing the extrusion conveyor belt assembly, to guide the packaging box 2 smoothly into the space between the two conveyor belt assemblies 3.

[0030] The working process of this utility model is as follows: After the packaging box 2 is heat-shrink packaged by the shrink wrapping machine, while the heat-shrink film is not completely cooled, it is guided by the guide plate into the space between two conveyor belt assemblies 3. Due to the special material and reasonable spacing design of the conveyor belt 3.1, the conveyor belt 3.1 exerts a moderate squeezing force on the sides of the packaging box 2, flattening the protrusions at the four corners of the heat-shrink film. Subsequently, the packaging box 2 enters the active cooling station 4, where it is rapidly cooled by the cold air sprayed from the cooling pipe 4.2, causing the flattened heat-shrink film to solidify and set, ultimately resulting in a product with a flat appearance and no sharp corner protrusions.

[0031] This invention effectively solves the problem of protruding corners in heat shrink film packaging by using a combination of an extrusion conveyor belt assembly and an active cooling station 4. This ensures the product's appearance while avoiding the safety hazard of sharp corners scratching consumers. The entire process is highly automated, simple to operate, and suitable for industrial production.

[0032] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent transformations or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A shrink-film smoothing device for a packaging box shrink-film machine, characterized in that: The device includes an extrusion conveyor belt assembly located at the outlet of a shrinking machine. The extrusion conveyor belt assembly includes two oppositely arranged conveyor belt components. Each conveyor belt component includes a mounting frame, a pair of drive rollers mounted on the mounting frame, and a conveyor belt sleeved on the drive rollers. The axis of the drive rollers is vertical, and the conveying direction of the conveyor belt is the same as the outlet direction of the shrinking machine. At least one of the pair of drive rollers is a drive roller. The conveyor belt is made of a flexible material, and its thickness is greater than the distance between the center of the rounded corner of the packaging box and the side of the packaging box. The distance between the conveyor belts on the two conveyor belt assemblies is less than the distance between the centers of the rounded corners on both sides of the packaging box.

2. The shrinking and smoothing device for a packaging box shrinking machine according to claim 1, characterized in that: The conveyor belt is made of polyurethane.

3. The shrinking and smoothing device for a packaging box shrinking machine according to claim 1, characterized in that: The pair of drive rollers, one of which is the driving roller and the other is the driven roller.

4. The shrinking and smoothing device for a packaging box shrinking machine according to claim 3, characterized in that: The passive roller is mounted on a mounting frame via a mounting shaft. The mounting frame has a waist-shaped hole, and the mounting shaft is installed inside the waist-shaped hole. The direction of the waist-shaped hole is parallel to the conveying direction of the conveyor belt assembly.

5. The shrinking and smoothing device for a packaging box shrinking machine according to claim 1, characterized in that: It also includes an active cooling station, which is located on one side of the conveying direction of the extrusion conveyor belt group. The active cooling station includes a roller conveyor belt and a cooling pipe above the roller conveyor belt. The cooling pipe is equipped with a ventilation pipe, which is connected to a cold air source. The cooling pipe has several air outlets facing the roller conveyor belt.

6. The shrinking and smoothing device for a packaging box shrinking machine according to claim 5, characterized in that: The conveyor rollers on the roller conveyor belt are ball bearings, and the length of the roller conveyor belt is the same as the length of the packaging box.

7. The shrinking and smoothing device for a packaging box shrinking machine according to claim 1, characterized in that: The shrink film machine has a funnel-shaped guide plate at the outlet, with the smaller opening of the funnel facing the extrusion conveyor belt assembly.

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