A film wrapping machine oven

Abstract

This utility model relates to the field of plastic packaging machinery technology, specifically to a film wrapping machine oven, and more particularly to a hot air circulation oven suitable for heat shrink packaging of irregularly shaped bottles, capable of achieving precise dynamic local temperature control and being energy-efficient. The film wrapping machine oven includes a housing, a main air box assembly and a heating fan disposed within the housing; it also includes several auxiliary air boxes and at least one circulating axial flow fan; the exhaust port of the circulating axial flow fan is connected to the air inlet of the auxiliary air box, and its air inlet is connected to the air outlet of the air collector; the air collector is elongated and positioned directly above the conveyor belt and along the length of the conveyor belt, with a slit on its air-taking surface facing the conveyor belt; the auxiliary air boxes are elongated and positioned directly below the conveyor belt and along the length of the conveyor belt, with multiple air outlets on their air-exit surface facing the conveyor belt.

Description

Technical Field

[0001] This utility model relates to the field of plastic packaging machinery technology, specifically to a film wrapping machine oven, and more particularly to a hot air circulation oven suitable for heat shrink packaging of irregularly shaped bottles, which can achieve precise dynamic control of local temperature and is energy-efficient. Background Technology

[0002] Heat shrink film packaging machines are key equipment in the food, beverage, and cosmetics industries. They use heat to make the shrink film adhere tightly to the product, achieving a shaped and aesthetically pleasing finish. The oven, as its core component, directly determines the packaging quality and production costs.

[0003] Currently, most mainstream film wrapping machine ovens use bottom or side heating for hot air. Their working principle involves a high-powered fan evenly blowing hot air generated by the heater out of the air outlet of the air box to heat the product. However, this type of oven has inherent drawbacks:

[0004] First, it has poor adaptability and is prone to localized shrinkage defects. Regardless of how the position of the air box and the air outlet structure are optimized, the structure that blows hot air through the air box will inevitably lead to uneven temperature distribution inside the oven. This problem is not significant for products with regular shapes. However, for various irregularly shaped bottles (such as bottles with uneven surfaces, wide shoulders and narrow necks, and products with bottom film), the contact distance and area between different parts and the hot air vary greatly, resulting in different heat requirements. Furthermore, eddies are easily formed on the bottle surface, leading to uneven temperature distribution. The existing air outlet structure cannot be adjusted for these variations, causing some parts to scorch while others experience insufficient shrinkage, resulting in wrinkles, tunnels, and other defects, severely impacting packaging quality.

[0005] Secondly, they consume a lot of energy and operate in a harsh environment. Traditional ovens need to continuously blow out heated air to maintain temperature, and most of the hot air is directly exhausted after use. This not only results in a huge waste of heat energy but also raises the ambient temperature around the equipment, worsening the operating environment.

[0006] Therefore, there is an urgent need in this field for a film wrapping oven solution that can perform local dynamic temperature control on irregularly shaped products, while improving thermal energy utilization and the working environment. Utility Model Content

[0007] The purpose of this utility model embodiment is to overcome the shortcomings of the prior art and provide a film wrapping machine oven that can accurately control local temperature, is highly adaptable, and is energy-saving.

[0008] To achieve the above-mentioned objectives, the present invention provides a film wrapping machine oven through the following technical solution:

[0009] A film wrapping machine oven includes a housing, a main air box assembly disposed within the housing, and a heating fan; the air outlet of the heating fan is connected to the air inlet of the main air box assembly; characterized in that it further includes several auxiliary air boxes and at least one circulating axial flow fan;

[0010] The circulating axial fan is located inside the housing, and its exhaust port is connected to the air inlet of the auxiliary air box, and its air inlet is connected to the air outlet of the air collector.

[0011] The air collector is elongated and positioned directly above the conveyor belt and along its length. It has an air-collecting surface facing the conveyor belt, and a slit is provided on the air-collecting surface. It is used to precisely extract air from a specific part of the product.

[0012] The auxiliary air box is elongated and located directly below the conveyor belt along its length. The auxiliary air box has an air outlet facing the conveyor belt, and multiple air outlets are provided on the air outlet. An air guide cavity is also formed inside the auxiliary air box, and the air guide cavity is connected to the air inlet and the air outlets.

[0013] More preferably, the auxiliary air box is tubular, with an air inlet at at least one end, its inner cavity forming the air guide cavity, and the air outlet opening on its tube wall.

[0014] More preferably, along the air flow direction inside the auxiliary air box, the spacing between the air outlets gradually increases, while the size of the inner cavity gradually decreases.

[0015] More preferably, the auxiliary air box has air inlets at both ends, and the distance between the air outlets gradually increases from the middle to both ends, while the size of its inner cavity gradually decreases.

[0016] More preferably, the number of circulating axial flow fans is two, and their exhaust ports are respectively connected to the air inlets at both ends of the auxiliary air box.

[0017] More preferably, a first guide rail is provided below the conveyor belt along its width direction, a first slider is slidably disposed on the first guide rail, and the auxiliary air box is fixed on the first slider and can move along the width direction of the conveyor belt.

[0018] More preferably, a second guide rail is provided above the conveyor belt along its width direction, and a second slider is slidably disposed on the second guide rail. The second slider has a cavity and forms an inlet and an outlet. The circulating axial flow fan is disposed below the conveyor belt, and its air inlet is connected to one end of the air intake pipe. The other end of the air intake pipe extends above the conveyor belt and is fixed at the outlet of the second slider. The inlet of the second slider is disposed downward and connected to the air collector through a telescopic pipe.

[0019] More preferably, the air collector is tubular, with both ends closed and an air outlet in the middle, its inner cavity forming the air guide cavity, and the slits are formed on its tube wall.

[0020] More preferably, the slit width gradually increases from the middle to both ends.

[0021] The beneficial effects of this utility model are:

[0022] By using a movable air intake and auxiliary air box, heat is transferred from a local high-temperature area to a local low-temperature area, achieving precise control of air intake and output from the problem point. This enables temperature management of specific parts of irregularly shaped products, thereby solving the problem of local overheating or overcooling.

[0023] Excess heat energy inside the chamber is converted into a regulating medium, requiring no additional energy, which greatly improves the utilization rate of heat energy and improves the working environment.

[0024] The air intake and auxiliary air box can move together or independently, thus enabling process adaptability for various irregularly shaped bottles.

[0025] Without changing the existing heating device structure of the film wrapping machine, it can be directly modified based on the existing film wrapping machine. Attached Figure Description

[0026] The above features and advantages of the present invention will become clearer and easier to understand from the following description of exemplary embodiments thereof in conjunction with the accompanying drawings.

[0027] Figure 1 This is a schematic cross-sectional view of the oven of the film wrapping machine according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the auxiliary air box in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the air intake device according to an embodiment of the present utility model. Detailed Implementation

[0030] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. 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 protection scope of this utility model.

[0031] The terms "front," "rear," "left," "right," "inner," and "outer" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

[0032] In the description of the following embodiments, unless otherwise expressly specified and limited, the term "connection" and other such terms should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] like Figure 1-3 As shown, this utility model embodiment provides a film wrapping machine oven. Similar to conventional film wrapping machine ovens in the prior art, it includes a housing, a main air box assembly 1 disposed within the housing, and a heating fan. The air outlet of the heating fan is connected to the air inlet of the main air box assembly 1. The main air box assembly and the heating fan assembly constitute the main heating system, and the conveyor belt 2 is a metal chain conveyor belt. Under the conveyor belt 2, the products on it move vertically... Figure 1 The product enters the box in the direction shown on the paper. It passes through the main air box assembly 1. The main air box assembly 1 blows hot air onto the product from both sides to complete the thermal shrinkage of the film.

[0034] The improvement of this utility model lies in the addition of a local adaptive control system, including an auxiliary air box 4, a circulating axial flow fan 5, and an air intake 3.

[0035] The circulating axial fan 5 is located inside the housing and has an exhaust port and an air inlet. Its exhaust port is connected to the air inlet of the auxiliary air box 4, and its air inlet is connected to the air outlet of the air collector 3.

[0036] See Figure 1 As shown, in this embodiment, there are two air collectors 3, which are elongated and suspended directly above the conveyor belt 2, and are arranged along the length of the conveyor belt 2. The bottom surface of the air collector 3 faces the conveyor belt 2 and has a slit 32 for precisely extracting air from specific parts of the product.

[0037] In a preferred embodiment, a second guide rail 6 is provided above the conveyor belt 2 along its width direction, and a second slider 61 is slidably mounted on the second guide rail 6. The second slider 61 has a cavity 611, forming an inlet and an outlet, with the inlet facing downwards and connected to a telescopic pipe 62. The air extractor 3 is tubular, closed at both ends, and its internal cavity forms an air guide chamber. An air outlet 31 communicating with the telescopic pipe 62 is provided in the middle of the cavity, and a slit 32 is opened on its pipe wall. The width of the slit gradually increases from the middle to both ends of the air extractor 3.

[0038] The circulating axial flow fan 5 is located below the conveyor belt 2, and its air inlet is connected to one end of the air intake pipe 51. The air intake pipe 51 is a flexible hose, and the other end of the air intake pipe 51 goes around one side of the conveyor belt 2 and extends to the top of the conveyor belt 2, and is fixed at the outlet of the second slider 61.

[0039] See Figure 1 As shown, the number of auxiliary air boxes 4 in this embodiment is illustrative, and there are 3 of them. The auxiliary air boxes 4 are also elongated and are located directly below the conveyor belt 2 and arranged along the length of the conveyor belt 2. Specifically, a first guide rail 7 is provided below the conveyor belt 2 along its width direction, and a first slider 71 is slidably arranged on the first guide rail 7. The auxiliary air boxes 4 are fixed to the first slider 71 by a bracket and can move along the width direction of the conveyor belt 2 to adjust the position of the auxiliary air boxes 4.

[0040] The auxiliary air box 4 has an air outlet facing the conveyor belt, with multiple air outlets 41 on the outlet surface. An air guide cavity is also formed inside the auxiliary air box 4, communicating with the air inlet and air outlets 41. The auxiliary air box 4 is tubular, with air inlets at both ends. Its inner cavity forms the air guide cavity, and air outlets 41 are formed on its tube wall. The spacing between the air outlets 41 gradually increases from the middle to both ends of the auxiliary air box 4 to ensure uniform airflow. Correspondingly, there are two circulating axial flow fans 5, and the exhaust port of each circulating axial flow fan 5 is connected to the air inlet at one end of the auxiliary air box 4 via a four-way connector.

[0041] The beneficial effects of this utility model are:

[0042] By using a movable air intake and auxiliary air box, precise closed-loop control is achieved to draw air from and deliver air to the problem point, enabling temperature management of specific parts of irregularly shaped products, thereby solving the problem of local overheating or overcooling.

[0043] Excess heat energy inside the chamber is converted into a regulating medium, requiring no additional energy, which greatly improves the utilization rate of heat energy and improves the working environment.

[0044] The air intake and auxiliary air box can move together or independently, thus enabling process adaptability for various irregularly shaped bottles.

[0045] Without changing the existing heating device structure of the film wrapping machine, it can be directly modified based on the existing film wrapping machine.

[0046] The present invention has been described in detail above through embodiments. However, those skilled in the art will understand that the above embodiments are only one of the preferred embodiments of the present invention. Due to space limitations, not all embodiments can be listed here. Any implementation that can embody the technical solution of the claims of the present invention is within the protection scope of the present invention.

[0047] It should be noted that the above content is a further detailed description of the present utility model in conjunction with specific embodiments, and it should not be considered that the specific embodiments of the present utility model are limited to this. Under the guidance of the above embodiments, those skilled in the art can make various improvements and modifications based on the above embodiments, and these improvements or modifications fall within the protection scope of the present utility model.

Claims

1. A film wrapping machine oven, comprising a housing, a main air box assembly disposed within the housing, and a heating fan; wherein the air outlet of the heating fan is connected to the air inlet of the main air box assembly; characterized in that: It also includes several auxiliary air boxes and at least one circulating axial fan; The circulating axial fan is located inside the housing, and its exhaust port is connected to the air inlet of the auxiliary air box, and its air inlet is connected to the air outlet of the air collector. The air collector is elongated and positioned directly above the conveyor belt and along the length of the conveyor belt. The air collector has an air intake surface facing the conveyor belt, and a slit is provided on the air intake surface. An air guide cavity is formed inside the air collector, and the air guide cavity of the air collector is connected to the slit and the air outlet. The auxiliary air box is elongated and located directly below the conveyor belt along its length. The auxiliary air box has an air outlet facing the conveyor belt, and multiple air outlets are provided on the air outlet. An air guide cavity is also formed inside the auxiliary air box, and the air guide cavity is connected to the air inlet and the air outlet.

2. A film wrapping machine oven as claimed in claim 1, characterized in that: The auxiliary air box is tubular, with an air inlet at at least one end, and its inner cavity forms the air guide cavity. The air outlet is opened on its tube wall.

3. A film wrapping machine oven according to claim 2, characterised in that: Along the direction of air flow inside the auxiliary air box, the spacing between the air outlets gradually increases.

4. A film wrapping machine oven as claimed in claim 3, characterized in that: The auxiliary air box has air inlets at both ends, and the distance between the air outlets gradually increases from the middle to both ends, while the size of its inner cavity gradually decreases.

5. A film wrapping machine oven as claimed in claim 4, characterized in that: The number of circulating axial flow fans is two, and their exhaust ports are respectively connected to the air inlets at both ends of the auxiliary air box.

6. The film wrapping machine oven of claim 1, wherein: The conveyor belt is provided with a first guide rail arranged along its width direction below it, and a first slider is slidably arranged on the first guide rail. The auxiliary air box is fixed on the first slider and can move along the width direction of the conveyor belt.

7. The film wrapping machine oven of claim 1, wherein: A second guide rail is provided above the conveyor belt along its width direction. A second slider is slidably mounted on the second guide rail. The second slider has a cavity forming an inlet and an outlet. The circulating axial flow fan is located below the conveyor belt, and its air inlet is connected to one end of the air intake pipe. The other end of the air intake pipe extends above the conveyor belt and is fixed at the outlet of the second slider. The inlet of the second slider is set downward and connected to the air collector through a telescopic pipe.

8. A film wrapping machine oven as claimed in claim 7, characterized in that: The air intake is tubular, with both ends closed and an air outlet in the middle. Its inner cavity forms the air guide cavity, and the slits are opened on its tube wall.

9. A film wrapping machine oven according to claim 8, characterised in that: The width of the slit gradually increases from its middle part to both ends.

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