Method of processing a refrigerated container and a refrigerated container

Abstract

The application discloses a processing method of a refrigerated container and the refrigerated container. The processing method comprises steps S1, S3 and S5. In step S1, foaming material is pre-injected into a groove, and pre-foaming is performed to form a pre-foaming layer with a preset thickness size. In step S3, an opening of the groove is covered by a cover plate to form a foaming cavity with the pre-foaming layer and the cover plate. In step S5, foaming material is injected into the foaming cavity, and second foaming is performed. Thus, before the second foaming, the pre-foaming layer with the preset thickness size is formed in the groove by pre-foaming, so as to fill part of the groove. Therefore, the pre-foaming layer and the second foaming layer can be composed of complete closed-cell bubbles as much as possible during the second foaming, and the space surrounded by the groove and the cover plate can be filled as much as possible, and heat leakage of the refrigerated container can be reduced as much as possible.

Description

Technical Field

[0001] This application relates to the field of containers, and more specifically to processing methods for refrigerated containers and refrigerated containers. Background Technology

[0002] Existing refrigerated containers consist of a container body. The container body includes walls. The walls include a base frame, side walls, end walls, and top walls. Before the base frame, side walls, end walls, and top walls are welded to form the container body, foaming material needs to be injected into the interior of the walls for the first foaming process to form a primary foam layer inside the walls.

[0003] The inner surface of the housing has grooves. The housing also includes a sealing plate. The sealing plate covers the opening of the grooves to form foam cavities. The housing is provided with an injection port. Foaming material can be injected into the foam cavities through the injection port for secondary foaming.

[0004] However, due to the fixed position of the injection port and the elongated structure of the foam cavity, the foaming material injected into the cavity may not reach areas far from the injection port. Consequently, the second foaming process may not completely fill the cavity or form a complete closed-cell bubble (i.e., the bubble is defective). In refrigerated containers, areas without a foamed layer or with defective bubbles within the foam cavity may experience heat leakage (heat loss).

[0005] Therefore, the present invention provides a processing method for a refrigerated container and a refrigerated container to at least partially solve the above-mentioned problems. Summary of the Invention

[0006] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed embodiments section. This summary section is not intended to limit the key features and essential technical features of the claimed technical solutions, nor is it intended to determine the scope of protection of the claimed technical solutions.

[0007] To at least partially solve the above-mentioned technical problems, this application provides a processing method for a refrigerated container. The refrigerated container includes a container body, and the inner surface of the ends of the container body is provided with grooves. The processing method includes:

[0008] Step S1: Inject foaming material into the groove and pre-foam it to form a pre-foamed layer of a preset thickness.

[0009] Step S3: Cover the opening of the groove with the sealing plate to form a foam cavity between the pre-foamed layer and the sealing plate;

[0010] Step S5: Inject foaming material into the foaming cavity and perform a second foaming.

[0011] According to the processing method of the refrigerated container of this application, before the second foaming, a pre-foamed layer of a predetermined thickness is formed in the groove to fill part of the groove. In this way, during the second foaming, the pre-foamed layer and the secondary foaming layer can be composed of complete closed-cell foam as much as possible, and fill the space enclosed by the groove and the sealing plate as much as possible, thereby minimizing heat leakage of the refrigerated container and improving the insulation performance of the refrigerated container. In addition, the amount of material injected during the second foaming is reduced, the foaming pressure is reduced, the clamping force is reduced, the foaming time is shortened, the waste of foaming material is avoided, and the service life of the mold is extended.

[0012] Optionally, prior to step S1, the processing method further includes a spraying step of spraying and heating the outer surface of the housing.

[0013] Optionally, while performing step S1, the coating quality of the container can be checked.

[0014] Optionally, the preset thickness dimension is ≤ 1 / 2 of the thickness dimension of the space enclosed by the groove and the sealing plate; and / or

[0015] Pre-foaming agents include cyclopentane or LBA.

[0016] Optionally, in step S1, before pre-injecting the foaming material into the groove, a protective film is laid on the portion of the inner surface located outside the groove; and / or

[0017] The groove includes a horizontal groove and a vertical groove. In step S1, foaming material is pre-injected into the vertical groove from bottom to top. In step S1, foaming material is pre-injected from one end of the horizontal groove to the other end.

[0018] Optionally, during the process of pre-injecting foaming material into the groove in step S1, the pressure P of the high-pressure gun head is in the range of 0.3MPa≤P≤0.5MPa, and the minimum distance H between the high-pressure gun head and the construction surface is in the range of 30cm≤H≤50cm.

[0019] Optionally, if the preset thickness dimension is >25mm, before step S3, the processing method performs step S1 at least twice in sequence, and the thickness dimension δ of the pre-foamed layer formed in each step S1 is in the range of δ≤25mm.

[0020] Optionally, the groove includes a horizontal groove and a vertical groove, and at the corner of the groove, the thickness dimension δ of the pre-foamed layer formed in each step S1 ranges from 15mm to δ to 20mm.

[0021] Optionally, the foaming time T in step S1 is in the range of 2 min ≤ T ≤ 3 min.

[0022] This application also provides a refrigerated container, which is processed by the aforementioned refrigerated container processing method.

[0023] According to the refrigerated container of this application, the refrigerated container is processed by the aforementioned refrigerated container processing method. Before the second foaming, a pre-foamed layer of a predetermined thickness is formed in the groove to fill part of the groove. In this way, during the second foaming, the pre-foamed layer and the secondary foaming layer can be composed of complete closed-cell foam as much as possible, and fill the space enclosed by the groove and the sealing plate as much as possible, thereby minimizing heat leakage of the refrigerated container and improving the insulation performance of the refrigerated container. In addition, the amount of material injected during the second foaming is reduced, the foaming pressure is reduced, the clamping force is reduced, the foaming time is shortened, the waste of foaming material is avoided, and the service life of the mold is extended. Attached Figure Description

[0024] To make the advantages of this application more readily apparent, the application briefly described above will be described in more detail with reference to the specific embodiments shown in the accompanying drawings. It is to be understood that these drawings depict only typical embodiments of this application and should not be considered as limiting its scope of protection. The application is described and explained with additional features and details through the drawings.

[0025] Figure 1 A three-dimensional schematic diagram of a refrigerated container processed according to a preferred embodiment of the present invention.

[0026] Figure 2 for Figure 1 A schematic diagram of the processing method of the refrigerated container, in which step S1 is performed at the groove on the side wall;

[0027] Figure 3 for Figure 2 A schematic diagram of the processing method of the refrigerated container, showing the execution of step S3 in the groove of the side wall;

[0028] Figure 4 for Figure 1 The processing method of refrigerated containers; a cross-sectional view of the completed refrigerated container cut open at point AA.

[0029] Figure 5 for Figure 1 The processing method of refrigerated containers; a cross-sectional view of the completed refrigerated container cut open at BB.

[0030] Figure 6 To execute Figure 1 A schematic diagram of the production line layout for processing refrigerated containers;

[0031] Figure 7 for Figure 6 A schematic diagram of the layout of the inspection stations on the production line; and

[0032] Figure 8 for Figure 1 A flowchart illustrating the processing method of refrigerated containers.

[0033] Explanation of reference numerals in the attached figures

[0034] 110: Pre-foamed box body; 111: End.

[0035] 112: Top wall; 113: Side wall

[0036] 114: Inner surface 115: Base frame

[0037] 120: Groove; 130: Protective film

[0038] 131: Inner protective film; 132: Outer protective film

[0039] 140: Spraying equipment; 141: High-pressure nozzle

[0040] 142: Pressure pump 143: Storage tank

[0041] 150: Slide rail; 151: Spray painting station

[0042] 152: Inspection station; 153: Sealing plate installation station

[0043] 154: Second foaming station; 155: Output station

[0044] 156: Sealing plate 160: Equipment inspection

[0045] 170: Pre-foamed layer Detailed Implementation

[0046] In the following description, numerous specific details are set forth to provide a more thorough understanding of this application. However, it will be apparent to those skilled in the art that embodiments of this application may be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described to avoid confusion with embodiments of this application.

[0047] The preferred embodiments of this application will now be described with reference to the accompanying drawings. It should be noted that the terms "upper," "lower," and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.

[0048] In this document, ordinal numbers such as “first” and “second” used in this application are merely identifiers and do not include any other meaning, such as a specific order.

[0049] To fully understand the embodiments of this application, a detailed structure will be presented in the following description. Obviously, the implementation of the embodiments of this application is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may also include other embodiments.

[0050] This embodiment provides a processing method for refrigerated containers. Please refer to... Figures 1 to 5 A refrigerated container includes a container body. The container body includes walls. The walls include a base frame 115, side walls 113, end walls, and a top wall 112. The base frame 115, side walls 113, end walls, and top wall 112 are generally rectangular parallelepiped structures. The end walls are located at the ends 111 of the container body. The side walls 113 are located on the sides of the container body. Before the base frame 115, side walls 113, end walls, and top wall 112 are welded to form the container body, foaming material needs to be injected into the interior of each of the base frame 115, side walls 113, end walls, and top wall 112 to form a primary foam layer inside the wall body.

[0051] like Figure 2 As shown, the inner surface 114 of the wall is recessed towards the outer surface along the thickness direction of the wall to form a groove 120. Grooves 120 are provided on the base frame 115, side walls 113, end walls, and top wall 112. After the base frame 115, side walls 113, end walls, and top wall 112 are welded to form a box, some of the grooves 120 are located near the ends 111 of the box. When the base frame 115, side walls 113, end walls, and top wall 112 are welded to form the box, the inner surface 114 of the wall is closer to the center of the box than the outer surface of the wall. The box also includes a sealing plate 156. The sealing plate 156 is used to cover the opening of the groove 120. The sealing plate 156 is connected to the inner surface 114 of the wall by rivets. The sealing plate 156 can be an aluminum alloy plate. The grooves 120 are located at the junctions of different walls. In this way, the foaming layer (including the pre-foaming layer 170 and the secondary foaming layer) set in the groove 120 can seal the gaps between different walls to prevent heat leakage from the box.

[0052] like Figure 8 As shown, the processing method includes steps S1, S3 and S5.

[0053] Step S1: Inject foaming material into the groove 120 in advance and pre-foam to form a pre-foamed layer 170 with a preset thickness.

[0054] like Figure 2As shown, the refrigerated container production line includes a spraying device 140. The spraying device 140 includes a high-pressure nozzle 141, a pressure pump 142, and a storage tank 143. The pressure pump 142 is connected to the storage tank 143 and the high-pressure nozzle 141 via a pipe, for pumping the foaming material in the storage tank 143 to the high-pressure nozzle 141. The production line also includes a slide rail 150. The slide rail 150 extends horizontally along its length. The pressure pump 142 and the storage tank 143 are movably mounted on the slide rail 150 along its length. The pre-foamed container 110 moves along the horizontal direction of the production line. The spraying device 140 can move automatically without manual operation, which reduces time wasted due to handling the spraying device 140 and reduces material loss. Furthermore, it allows for precise control of the spraying device 140 to reach its working position.

[0055] After the base frame 115, side walls 113, and top wall 112 are welded to form a roughly rectangular structure (pre-foamed box 110), the spraying device 140 can enter the pre-foamed box 110 through the end 111. The spraying device 140, once inside the pre-foamed box 110, can pre-inject foaming material into the groove 120 located at the end of the pre-foamed box 110 via a high-pressure nozzle 141. The foaming material pre-foams within the groove 120 to form a pre-foamed layer 170. The pre-foamed layer 170 fills the bottom of the groove 120, away from the inner surface 114 of the wall containing the groove. Along the thickness direction of the wall containing the groove 120, the thickness of the pre-foamed layer 170 is a preset thickness. The preset thickness is greater than 0 mm.

[0056] Step S3 is executed after step S1.

[0057] Step S3: Cover the opening of the groove 120 with the sealing plate 156 to form a foam cavity.

[0058] like Figure 3 As shown, after the pre-foamed layer 170 is formed in step S1, a sealing plate 156 can be installed at the end 111 of the pre-foamed box 110 so that the sealing plate 156 connects to the inner surface 114 of the wall, thereby covering the opening of the groove 120. The pre-foamed layer 170 and the sealing plate 156 are spaced apart. In this way, the sealing plate 156 and the pre-foamed layer 170 are in a non-contact state. The space between the sealing plate 156 and the pre-foamed layer 170 forms a foamed cavity.

[0059] Step S5 is executed after step S3.

[0060] Step S5: Inject foaming material into the foaming cavity and perform a second foaming.

[0061] The sealing plate 156 and the wall can be pre-set with injection ports (not shown). After the sealing plate 156 covers the opening of the groove 120, foaming material can be injected into the foaming cavity through the injection port via the high-pressure gun head 141. The foaming material undergoes a second foaming in the foaming cavity to form a secondary foaming layer. The secondary foaming layer fills the space between the pre-foamed layer 170 and the sealing plate 156, so that the pre-foamed layer 170 and the secondary foaming layer fill the space enclosed by the sealing plate 156 and the groove 120.

[0062] The production line also includes a secondary foaming mold. During the second foaming, a secondary foaming mold can be installed inside the pre-foaming box 110. The secondary foaming mold is used to apply a molding force (clamping force) to the sealing plate 156, thereby pressing the sealing plate 156 against the inner surface 114 of the wall under the action of the molding force. This is used to overcome the force (foaming pressure, i.e., holding pressure) exerted on the sealing plate 156 by the foamed material during the second foaming.

[0063] Before the second foaming, a pre-foamed layer 170 of a predetermined thickness is pre-foamed within the groove 120 to fill a portion of the groove 120. This reduces the amount of foaming material required for the second foaming (foaming material injection volume), effectively lowering the foaming pressure and clamping force of the secondary foaming mold. Reduced clamping force effectively minimizes damage to the secondary foaming mold and extends its service life. The reduced foaming material injection volume also significantly improves demolding time, thereby increasing production efficiency. Furthermore, the predetermined thickness of the pre-foamed layer 170 is less than or equal to the thickness of the space enclosed by the groove and the sealing plate, ensuring a well-formed pre-foamed layer 170.

[0064] On the other hand, pre-foaming is performed at key locations where problems are likely to occur (the bottom of the groove 120) to form a pre-foamed layer 170 with better foam quality. This reduces the probability of significant heat leakage in the box caused by poor foam quality in the secondary foamed layer formed by the second foaming. The demolding time is the time from the start of injecting foaming material into the foaming cavity until the secondary foamed layer is formed, and from the time the secondary foaming mold can be removed.

[0065] The secondary foaming layer formed by the second foaming can be integrated with the pre-foamed layer 170 so that the foaming material of the second foaming and the material of the pre-foamed layer 170 are mixed, thereby making the secondary foaming layer and the pre-foamed layer 170 a whole, thus improving the insulation performance of the refrigerated container.

[0066] In this embodiment, before the second foaming, a pre-foamed layer 170 of a predetermined thickness is pre-foamed in the groove 120 to fill part of the groove 120. In this way, during the second foaming, the pre-foamed layer 170 and the secondary foamed layer can be composed of complete closed-cell foam as much as possible, and fill the space enclosed by the groove 120 and the sealing plate 156 as much as possible, thereby minimizing heat leakage of the refrigerated container and improving the insulation performance of the refrigerated container. In addition, the amount of material injected during the second foaming is reduced, the foaming pressure is reduced, the clamping force is reduced, the foaming time is shortened, the waste of foaming material is avoided, and the service life of the mold is extended.

[0067] Optionally, prior to step S1, the processing method further includes a spraying step of spraying and heating the outer surface of the housing.

[0068] The spraying process includes spraying the outer surface of the pre-foamed housing 110. Specifically, the outer surfaces of the side walls 113 and the top wall 112 are sprayed. After spraying the outer surface of the pre-foamed housing 110, the pre-foamed housing 110 is heated after the paint has been applied.

[0069] After the pre-foamed box 110 is heated with the sprayed paint, the temperature of the pre-foamed box 110 is relatively high (30°C to 50°C). At this time, step S1 is executed. In this way, the high temperature of the pre-foamed box 110 can improve the foaming efficiency of pre-foaming, thereby quickly forming the pre-foamed layer 170. At the same time, it can better bond and fuse the pre-foamed body of the pre-foamed layer 170 with the box, and better bond and fuse the pre-foamed body of the pre-foamed layer 170 with the primary foaming layer. In this way, the step of heating the pre-foamed box 110 during pre-foaming can be reduced, thereby improving the overall efficiency.

[0070] Optionally, while performing step S1, the quality of the refrigerated container coating can be checked.

[0071] like Figure 6 As shown, the production line includes a spraying station 151, an inspection station 152, a sealing plate installation station 153, a second foaming station 154, and an output station 155, arranged sequentially along a horizontal direction. The pre-foamed container 110 is conveyed to the spraying station 151 to complete the spraying process. It is then conveyed to the inspection station 152, where step S1 and the inspection of the spraying quality of the refrigerated container are completed. It is then conveyed to the sealing plate installation station 153 to install the sealing plate 156; then to the second foaming station 154 for a second foaming process; and finally, it is conveyed away via the output station 155.

[0072] like Figure 7As shown, the production line includes an inspection device 160 and a spraying device 140 located at inspection station 152. The inspection device 160 is used to inspect the coating quality of the refrigerated container. At inspection station 152, along the width direction of the pre-foamed container 110, the inspection device 160 observes the side wall 113 and top wall 112 of the pre-foamed container 110 from the outer side of the side wall 113 away from the center of the pre-foamed container 110, and from above the pre-foamed container 110, thereby inspecting the coating quality of the refrigerated container.

[0073] Please continue to refer to this. Figure 7 At inspection station 152, before the spraying device 140 enters the pre-foamed container 110, the spraying device 140 is located outside the end 111 of the pre-foamed container 110 along its length. At inspection station 152, the spraying device 140 moves horizontally and enters the pre-foamed container 110 via the end 111, thus completing the pre-foaming. The spraying device 140 and the inspection device 160 are spaced apart. The spraying device 140 operates inside the pre-foamed container 110. The inspection device 160 operates outside the pre-foamed container 110. In this way, the spraying device 140 and the inspection device 160 do not interfere with each other's work. Therefore, step S1 and the step of inspecting the coating quality of the refrigerated container can be performed simultaneously, improving the efficiency of processing refrigerated containers.

[0074] Furthermore, such as Figure 7 As shown, one spraying device 140 is located on the outside of one end 111 of the refrigerated container, and another spraying device 140 is located on the outside of the other end 111 of the refrigerated container. In this way, the two spraying devices 140 can be used simultaneously to inject foaming material into both ends of the pre-foamed container body 110 of the refrigerated container. This improves production efficiency.

[0075] Optionally, the preset thickness dimension is ≤ 1 / 2 of the thickness dimension of the space enclosed by the groove and the sealing plate. As a result, the pre-foaming time is short and the foam quality of the pre-foamed layer 170 is good.

[0076] In this article, the thickness dimension of a structure (which can be a space or a component) is the dimension along the thickness direction of the wall in which the structure is located.

[0077] Optionally, the pre-foamed blowing agent includes cyclopentane or LBA (HFO-1233zd, 1-chloro-3,3,3-trifluoropropylene). This allows for better adhesion to the foam in the primary foam layer.

[0078] Optionally, please return Figure 2 In step S1, before pre-injecting foaming material into the groove 120, a protective film 130 is laid on the portion of the inner surface 114 located outside the groove 120.

[0079] The protective film 130 can be adhered to the inner surface 114. The protective film 130 can be non-woven fabric or plastic film. The protective film 130 includes an inner protective film 131 and an outer protective film 132. Along the length of the pre-foamed box 110, the inner protective film 131 is located on the side of the groove 120 closest to the center of the pre-foamed box 110. Along the length of the pre-foamed box 110, the outer edge of the inner protective film 131 is flush with the inner surface of the groove 120. Along the length of the pre-foamed box 110, the outer protective film 132 is located on the other side of the groove 120 away from the center of the pre-foamed box 110. Along the length of the pre-foamed box 110, the inner edge of the outer protective film 132 is flush with the outer surface of the groove 120. Along the length of the pre-foamed box 110, the outer edge of the inner protective film 131 is the edge of the inner protective film away from the center of the pre-foamed box 110. Along the length of the pre-foamed box 110, the inner side of the groove 120 is the side of the groove 120 closest to the center of the pre-foamed box 110. Along the length of the pre-foamed box 110, the inner edge of the outer protective film 132 is the edge of the outer protective film 132 closest to the center of the pre-foamed box 110. Along the length of the pre-foamed box 110, the outer side of the groove 120 is the side of the groove 120 furthest from the center of the pre-foamed box 110.

[0080] Please refer to Figure 7 Before performing the spraying step, you can Figure 2 The inner protective film 131 is laid at the position shown. At this time, along the length of the pre-foamed box 110, the inner protective film 131 is located on the side of the groove 120 near the center of the pre-foamed box 110. Along the length of the pre-foamed box 110, the outer edge of the inner protective film 131 is flush with the inner side of the groove 120. Thus, during the spraying step, the inner protective film 131 protects the portion of the inner surface 114 of the wall located on the side of the groove 120 near the center of the pre-foamed box 110, reducing paint splashing onto this portion of the inner surface 114 of the wall, thereby reducing the possibility of contaminating the inner surface 114 of the wall.

[0081] After the spraying process is completed, during the inspection of the spraying quality of the refrigerated container, the inner protective film 131 can be retained, and... Figure 2 The outer protective film 132 is affixed to the position shown. At this time, along the length of the pre-foamed box 110, the outer protective film 132 is located on the side of the groove 120 away from the center of the pre-foamed box 110. Along the length of the pre-foamed box 110, the inner edge of the outer protective film 132 is flush with the outer surface of the groove 120. For example... Figure 2 and Figure 3As shown, after the pre-foamed layer 170 is formed and before the sealing plate 156 is installed, the protective film 130 can be peeled off to facilitate the installation of the sealing plate 156. Thus, when the foaming material is pre-injected into the groove 120, the inner protective film 131 and the outer protective film 132 can protect the inner surface 114 of the wall, reducing the possibility of foaming material splashing onto and contaminating the inner surface 114 of the wall. Furthermore, retaining the inner protective film 131 before pre-injecting the foaming material reduces the time required to lay the protective film 130, improving production efficiency.

[0082] Optionally, during the pre-injection of foaming material into the groove 120 in step S1, the pressure P of the high-pressure nozzle 141 ranges from 0.3 MPa ≤ P ≤ 0.5 MPa. The minimum distance H between the high-pressure nozzle 141 and the construction surface (i.e., the bottom surface of the groove 120) ranges from 30 cm ≤ H ≤ 50 cm. This minimizes the possibility of foaming material splashing onto the inner surface 114 of the wall and contaminating it. Along the thickness direction of the wall, the bottom surface of the groove and the inner surface of the wall are spaced apart. The bottom surface of the groove connects to the inner surface of the wall through its side surface.

[0083] Alternatively, please refer to Figure 4 and Figure 5 , Figure 4 for Figure 1 The refrigerated container is cut open at point AA and viewed along the length of the container 110 towards the center of the container. Figure 5 for Figure 1 The refrigerated container is cut open at the BB section and viewed along the length of the container body 110 towards the center of the container. The recess 120 includes a communicating horizontal recess and a vertical recess. The length of the horizontal recess is parallel to the width direction of the pre-foamed container body 110. The horizontal recess is located on the top wall 112 and the bottom frame 115. The length of the vertical recess extends vertically. The vertical recess is located on the side wall 113.

[0084] During step S1, the high-pressure nozzle 141 moves at a constant speed from bottom to top to pre-inject foaming material (such as...) into the vertical groove from bottom to top. Figure 4 and Figure 5 (As shown by the red arrow parallel to the vertical direction). This can improve the quality of the foam in the pre-foamed layer 170 within the vertical groove.

[0085] During step S1, the high-pressure nozzle 141 moves at a constant speed from one end of the horizontal groove to the other end to pre-inject foaming material (such as...) from one end of the horizontal groove to the other end. Figure 4 and Figure 5(As indicated by the red arrow parallel to the width direction of the pre-foamed chamber 110). This improves the quality of the foam in the pre-foamed layer 170 within the horizontal groove.

[0086] Optionally, if the preset thickness is greater than 25mm, the processing method shall perform step S1 at least twice before step S3.

[0087] A preset thickness dimension > 25mm indicates a relatively large preset thickness. In this case, before step S3, the processing method executes step S1 at least twice in sequence. Each time step S1 forms a pre-foamed layer 170 with a thickness dimension δ ≤ 25mm. Thus, the first pre-foamed layer 170 with a smaller thickness dimension δ is formed, reducing the possibility of reducing the foam quality of the pre-foamed layer 170.

[0088] Optionally, at corner locations (e.g., near the junction of a horizontal and a vertical groove), the thickness dimension δ of the pre-foamed layer 170 formed in each step S1 ranges from 15 mm ≤ δ ≤ 20 mm. This results in a pre-foamed layer 170 with a smaller thickness dimension δ being formed at the corner location, reducing the likelihood of decreasing the foam quality of the pre-foamed layer 170 at the corner location.

[0089] Optionally, the foaming time T in step S1 can be in the range of 2 min ≤ T ≤ 3 min. Therefore, while ensuring the quality of the pre-foamed layer 170, the foaming time T in step S1 can be reduced, thereby improving the processing efficiency of refrigerated containers.

[0090] Optionally, after step S3 and before step S5, the sidewalls 113 and top wall 112 can be sprayed with markings and the pre-foaming box 110 can be heated at the second foaming station 154, so that the second foaming can be carried out quickly.

[0091] This application also provides a refrigerated container. The refrigerated container is manufactured using the aforementioned processing method.

[0092] In this embodiment, the refrigerated container is processed by the aforementioned processing method. Before the second foaming, a pre-foamed layer 170 with a predetermined thickness is pre-foamed in the groove 120 to fill part of the groove 120. In this way, during the second foaming, the pre-foamed layer 170 and the secondary foamed layer can be composed of complete closed-cell foam as much as possible, and fill the space enclosed by the groove 120 and the sealing plate 156 as much as possible, thereby minimizing heat leakage of the refrigerated container and improving the insulation performance of the refrigerated container. In addition, the amount of material injected during the second foaming is reduced, the foaming pressure is reduced, the clamping force is reduced, the foaming time is shortened, the waste of foaming material is avoided, and the service life of the mold is extended.

[0093] This application has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this application to the scope of the described embodiments. Furthermore, those skilled in the art will understand that this application is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this application, all of which fall within the scope of protection claimed in this application. The scope of protection of this application is defined by the appended claims and their equivalents.

[0094] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of this application. Terms such as “component” as used herein may refer to a single part or a combination of multiple parts. Terms such as “installation” or “installation” as used herein may refer to a component being directly attached to another component or a component being attached to another component via an intermediary. A feature described in one embodiment herein may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

Claims

1. A processing method for refrigerated containers, characterized in that, The refrigerated container includes a container body, and the inner surface of the end of the wall of the container body is provided with a groove. The processing method includes: Step S1: Inject foaming material into the groove in advance and pre-foam to form a pre-foamed layer of a preset thickness. Step S3: Cover the opening of the groove with a sealing plate so that the pre-foamed layer and the sealing plate form a foaming cavity. The pre-foamed layer and the sealing plate are spaced apart, and the space between the sealing plate and the pre-foamed layer forms the foaming cavity. Step S5: Inject foaming material into the foamed cavity and perform a second foaming; Before the wall is welded to form the box body, foaming material is injected into the interior of the wall and a first foaming process is performed to form a primary foam layer located inside the wall body.

2. The processing method for refrigerated containers according to claim 1, characterized in that, Before step S1, the processing method further includes a spraying step of spraying and heating the outer surface of the housing.

3. The processing method for refrigerated containers according to claim 2, characterized in that, While performing step S1, check the coating quality of the container.

4. The processing method for refrigerated containers according to claim 1, characterized in that, The preset thickness dimension is ≤ 1 / 2 of the thickness dimension of the space enclosed by the groove and the sealing plate; and / or The pre-foamed foaming agent includes cyclopentane or LBA.

5. The processing method for refrigerated containers according to claim 1, characterized in that, In step S1, before pre-injecting the foaming material into the groove, a protective film is laid on the portion of the inner surface located outside the groove; and / or The groove includes a horizontal groove and a vertical groove. In step S1, foaming material is pre-injected into the vertical groove from bottom to top. In step S1, foaming material is pre-injected from one end of the horizontal groove toward the other end.

6. The processing method for refrigerated containers according to claim 1, characterized in that, During the process of pre-injecting foaming material into the groove in step S1, the pressure P of the high-pressure gun head is in the range of 0.3MPa≤P≤0.5MPa, and the minimum distance H between the high-pressure gun head and the construction surface is in the range of 30cm≤H≤50cm.

7. The processing method for refrigerated containers according to claim 1, characterized in that, When the preset thickness dimension is >25mm, before step S3, the processing method executes step S1 at least twice in sequence, and the thickness dimension δ of the pre-foamed layer formed in each step S1 is in the range of δ≤25mm.

8. The processing method for refrigerated containers according to claim 1, characterized in that, The groove includes a horizontal groove and a vertical groove. At the corner of the groove, the thickness dimension δ of the pre-foamed layer formed in each step S1 ranges from 15mm to δ to 20mm.

9. The processing method for refrigerated containers according to claim 1, characterized in that, The foaming time T in step S1 is in the range of 2 min ≤ T ≤ 3 min.

10. A refrigerated container, characterized in that, The refrigerated container is processed by the refrigerated container processing method according to any one of claims 1 to 9.

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