Refrigerator metal door shell reinforcing process

Abstract

The present application relates to the technical field of refrigerator processing technology, in particular to a refrigerator metal door shell reinforcing process; comprising a spraying process after the door shell is formed, the spraying process raw material comprises A and B components, wherein the A component is isocyanate, and the B component is combined polyether; the A component with the component of isocyanate and the B component with the component of combined polyether are sprayed into the inner side of the door shell after blending, the spraying raw material is consistent with the basic raw material of the door body foaming material, and the spraying raw material is polyurethane raw material; the spraying material does not contain a physical foaming agent, the foam formed after reaction has high viscosity and toughness. Therefore, the spraying layer can be very firmly bonded to the inner side of the metal door shell, and the spraying layer and the foaming layer have good adhesion and compatibility, and the spraying layer and the foaming layer will not have corrosion and other adverse reactions.

Description

Technical Field

[0001] This invention relates to the field of refrigerator processing technology, specifically to a process for reinforcing the metal door shell of a refrigerator. Background Technology

[0002] A refrigerator is a refrigeration device that maintains a constant low temperature; it is also a consumer product that keeps food or other items at a constant low temperature. Inside the refrigerator is a compressor, an ice maker, a cabinet or box for freezing ice, and a storage box with a refrigeration unit.

[0003] To achieve better refrigeration and storage effects, refrigerator doors often use foaming equipment to create foam from a certain concentration of foaming agent aqueous solution, which is then filled into the refrigerator door to provide insulation.

[0004] After foaming, there is a risk that the metal door shell of refrigerators and freezers may become uneven or detach from the foaming material. The industry standard solution to this risk is to attach a layer of felt to the inner surface of the door shell for reinforcement and protection, which, however, increases costs. Summary of the Invention

[0005] The purpose of this invention is to provide a process for reinforcing the metal door shell of a refrigerator, thereby solving the following technical problems:

[0006] (1) How to solve the problem of refrigerator door delamination after foaming at a lower cost.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A process for reinforcing a refrigerator metal door shell includes adding a spraying process after the door shell is formed. The raw materials for the spraying process include components A and B, wherein component A is isocyanate and component B is a polyether.

[0009] As a further aspect of the present invention: the spraying process includes the following steps:

[0010] S1. Inject components A and B into the injection gun head through the feed pipes respectively, and mix them thoroughly to obtain the spray coating;

[0011] S2. The injection gun head adopts an automatic walking spraying method to evenly spray the coating material onto the inside of the door shell.

[0012] As a further aspect of the present invention: the injection gun head in step S1 includes a first feed tube, a second feed tube, a body, and a gun head.

[0013] As a further aspect of the present invention: the main body is provided with a first chamber communicating with a first feed pipe and a second chamber communicating with a second feed pipe.

[0014] As a further aspect of the present invention: the first chamber is provided with an injection pipe at the end away from the first feed pipe, the injection pipe including a sliding part slidably connected to the first chamber, an injection head away from the sliding part and a constricted neck, the injection head is provided with a movable baffle plate at the end away from the first feed pipe, the second chamber is provided with a partition plate at the end away from the first feed pipe, and the partition plate is provided with an injection hole corresponding to the injection head.

[0015] As a further aspect of the present invention: the cross-sectional area of ​​the neck is smaller than the cross-sectional area of ​​the head of the main material.

[0016] The beneficial effects of this invention are:

[0017] (1) This application involves spraying a mixture of component A (isocyanate) and component B (polyether) onto the inner side of the door shell. The spraying material is consistent with the basic raw material of the door body foam, both being polyurethane raw materials. The spraying material does not contain physical foaming agents, and the foam formed after the reaction has high viscosity and toughness. Therefore, the sprayed layer can be firmly bonded to the inner side of the metal door shell, and has good adhesion and compatibility with the foam material. The sprayed layer and the foam layer will not undergo adverse reactions such as corrosion.

[0018] (2) This application also provides an injection nozzle for mixing component A and component B. When the first injection tube injects the raw material, the pressure will cause the injection tube to drop, thereby causing the injection head to extend out of the injection hole. At this time, the neck and the injection hole will form a leakage gap, which will facilitate the components in the second chamber to enter the lower space of the injection hole and mix with the components discharged from the injection head. This achieves synchronous feeding of the two components and also avoids the problem of the mixed raw material entering the first chamber and the second chamber, causing the chamber to be blocked. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the injection gun head structure for the refrigerator metal door shell reinforcement process of the present invention;

[0021] Figure 2 This is a schematic diagram of the injection gun head structure during component mixing in the refrigerator metal door shell reinforcement process of this invention.

[0022] In the diagram: 11, First feed pipe; 12, Second feed pipe; 21, First chamber; 22, Second chamber; 31, Sliding part; 32, Neck; 33, Injection head; 34, Movable baffle plate; 4, Baffle plate; 5, Main body; 51, Mixing chamber; 52, Gun head. Detailed Implementation

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

[0024] Please see Figure 1-2 As shown, the present invention is a process for reinforcing a refrigerator metal door shell, which includes adding a spraying process after the door shell is formed. The raw materials for the spraying process include components A and B, wherein component A is isocyanate and component B is a polyether.

[0025] In this embodiment, a spraying process is added after the refrigerator door shell is formed. A mixture of isocyanate and polyether is sprayed onto the surface of the door shell. Component A (isocyanate) and component B (polyether) are blended and then sprayed onto the inside of the door shell. The spraying material is consistent with the basic raw material of the door body foam, both being polyurethane. The sprayed material does not contain physical foaming agents, and the foam formed after the reaction has high viscosity and toughness. Therefore, the sprayed layer can be firmly bonded to the inside of the metal door shell, and has good adhesion and compatibility with the foam. The sprayed layer and the foam layer will not undergo adverse reactions such as corrosion. To achieve the above objectives, this embodiment can use any type of A and B components, as long as it is ensured that both can cure on the door shell after spraying to form a high-strength film. Based on the needs of sterilization, brightening, and increased strength, those skilled in the art can also add raw materials that do not hinder the curing of the A and B components to impart functionality.

[0026] Specifically, the spraying process includes the following steps:

[0027] S1. Inject components A and B into the injection gun head through the feed pipes respectively, and mix them thoroughly to obtain the spray coating;

[0028] S2. The injection gun head adopts an automatic walking spraying method to evenly spray the coating material onto the inside of the door shell;

[0029] The injection nozzle in step S1 includes a first feed pipe 11, a second feed pipe 12, a main body 5, and a nozzle 52.

[0030] In this embodiment, to avoid the problem that premature mixing of components AB can lead to premature curing, the injection gun head of this embodiment uses a separate injection method to introduce AB into the injection gun head, and the injection is only started when spraying is required.

[0031] Specifically, the main body 5 is provided with a first chamber 21 connected to the first feed pipe 11 and a second chamber 22 connected to the second feed pipe 12; the first chamber 21 is provided with an injection pipe at the end away from the first feed pipe 11, the injection pipe includes a sliding part 31 slidably connected to the first chamber 21, an injection head 33 away from the sliding part 31 and a neck 32, the injection head 33 is provided with a movable baffle plate 34 at the end away from the first feed pipe 11, the second chamber 22 is provided with a partition plate 4 at the end away from the first feed pipe 11, and the partition plate 4 is provided with an injection hole corresponding to the injection head 33; the cross-sectional area of ​​the neck 32 is smaller than the cross-sectional area of ​​the main material head.

[0032] In this embodiment, the injection tube includes a sliding part 31, a constricted neck 32, and an injection head 33. The sliding part 31 is slidably connected to the first chamber 21. Specifically, the outer edge of the sliding part 31 is pressed tightly against the inner wall of the first chamber 21. This is to prevent the injected liquid component from entering the gap between the first chamber 21 and the sliding part 31, and also to allow the sliding part 31 to slide up and down within the first chamber 21. To prevent the sliding part 31 from falling out, a stop block is provided at the lower part of the first chamber 21 to block the sliding part 31. In a single use, the injection tube only needs to slide downwards. However, considering multiple uses and the need to ensure that the two components do not mix when the injection tube is not being sprayed, a reset device, such as a spring or a magnetic reset structure, can be provided between the constricted neck 32 and the first chamber 21. For example, a longitudinally arranged spring can connect the sliding part 31 and the stop block of the first chamber 21. Those skilled in the art can also provide other similar structures or devices based on the above purposes. The cross-sectional area of ​​the constricted neck 32 is smaller than that of the sliding part 31 and the injection head 33. This is to prevent the liquid component from entering the gap between the first chamber 21 and the first chamber 21. The sliding part 31 can be prevented from dislodging from the first chamber 21 by the setting of the stop block. At the same time, when the injection tube descends, the constricted neck 32 can form a gap with the partition 4, and the material in the second chamber 22 can enter the mixing chamber 51 below the partition 4 through the gap. The injection head 33 is provided with a movable baffle 34. When spraying, the liquid component enters the first chamber 21 through the first feed pipe 11 and applies a pushing force to the movable baffle 34. While pushing the movable baffle 34 open, the entire injection tube is lowered, allowing the injection head 33 to extend into the mixing chamber. In the mixing chamber 51, to achieve the above objectives, the movable baffle 34 can be made of a flexible elastic material or composed of a set of blades with limited rotation angle. When the liquid component pushes the movable baffle 34 away, the movable baffle 34 will still obstruct the flow of some liquid components, thereby allowing the injection pipe to obtain the force to overcome the reset device, so that the injection pipe can continuously maintain the effect of the injection head 33 extending into the mixing chamber 51. After the A and B components enter the mixing chamber 51, they can mix naturally by relying on their initial velocities, or an additional stirring device can be added to promote their mixing.

[0033] In the description of this invention, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A process for reinforcing the metal door shell of a refrigerator, characterized in that, This includes adding a spraying process after the door shell is formed. The raw materials for the spraying process include components A and B, wherein component A is isocyanate and component B is a polyether combination. The spraying process includes the following steps: S1. Inject components A and B into the injection gun head through the feed pipes respectively, and mix them thoroughly to obtain the spray coating; S2. The injection gun head adopts an automatic walking spraying method to evenly spray the coating material onto the inside of the door shell; The injection nozzle in step S1 includes a first feed tube (11), a second feed tube (12), a main body (5), and a nozzle (52). The main body (5) is provided with a first chamber (21) connected to the first feed pipe (11) and a second chamber (22) connected to the second feed pipe (12). The first chamber (21) is provided with an injection pipe at the end away from the first feed pipe (11). The injection pipe includes a sliding part (31) that is slidably connected to the first chamber (21), an injection head (33) away from the sliding part (31), and a neck (32). The injection head (33) is provided with a movable baffle plate (34) at the end away from the first feed pipe (11). The second chamber (22) is provided with a partition plate (4) at the end away from the first feed pipe (11). The partition plate (4) is provided with an injection hole corresponding to the injection head (33).

2. The refrigerator metal door shell reinforcement process according to claim 1, characterized in that, The cross-sectional area of ​​the neck (32) is smaller than that of the head of the main material.

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