Steel-plastic composite trailer door panel

Abstract

The utility model discloses a steel-plastic composite trailer door panel, which relates to the technical field of composite panels, including a foamed plastic core layer and an outer wall layer and an inner wall layer respectively located on both sides of the foamed plastic core layer, the outer wall layer is provided with inwardly concave strip-shaped longitudinal grooves, and the inner wall layer is provided with inwardly concave strip-shaped transverse grooves; the foamed plastic core layer is arranged in contact with the inner wall surface of the inner wall layer and the outer wall layer, and connected together by an adhesive layer; the inner wall layer and the outer wall layer are steel plates, and the outer wall of the steel plate is provided with a protective paint layer; the edge of the foamed plastic core layer is provided with a reinforcement frame composed of metal pipes or profiles. The utility model is used to solve the problem that the existing pure steel door panel of the trailer is too heavy and has poor heat insulation effect, resulting in excessive trailer weight, and the existing steel-wood composite door panel is high in cost and unstable in installation.

Description

Technical Field

[0001] The utility model relates to the technical field of composite plates, in particular to a steel-plastic composite trailer door panel. Background Art

[0002] The rear door panel structure of a traditional van or van semi-trailer is a pure steel plate or a steel-wood composite door panel. The steel door panel is formed by pressing and welding steel plates, and has a heavy weight and complex process.

[0003] The surface of the steel-wood composite door panel is galvanized steel or aluminum plate, and the core plate is plywood. The surface plate and the core plate are bonded with adhesive. The characteristics of the steel-wood composite door panel are smooth and beautiful inside and outside surfaces, light weight, and high strength. The disadvantage is that the cost is high, and the core plate is not easy to process. If there are lines on the surface of the steel plate, it is difficult to completely fit the core plate. In addition, the connection between the steel-wood composite door panel and the van or semi-trailer is not strong and is easy to loosen and detach.

[0004] Based on this, designing a trailer door panel with light weight, high anti-deformation strength and firm installation will have greater benefits for improving the safety, energy conservation, service life and other performance of the trailer. Utility Model Content

[0005] In view of the above problems, the utility model provides a steel-plastic composite trailer door panel, which is used to solve the problem that the existing pure steel door panel of the trailer is too heavy and has poor insulation effect, resulting in excessive trailer weight, and the problem that the existing steel-wood composite door panel is high in cost and unstable in installation.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The steel-plastic composite trailer door panel comprises a foamed plastic core layer and an outer wall layer and an inner wall layer respectively located on both sides of the foamed plastic core layer, wherein the outer wall layer is provided with inwardly concave strip-shaped longitudinal grooves, and the inner wall layer is provided with inwardly concave strip-shaped transverse grooves; the foamed plastic core layer is arranged in contact with the inner wall surfaces of the inner wall layer and the outer wall layer, and connected together by an adhesive layer; the inner wall layer and the outer wall layer are steel plates, and a protective paint layer is provided on the outer wall of the steel plate; a reinforcing frame composed of metal pipes or profiles is provided at the edge of the foamed plastic core layer.

[0008] Compared with the prior art, the beneficial effects of the utility model are:

[0009] The steel-plastic composite trailer door panel of the utility model can ensure that the trailer door panel has sufficiently high strength while being lighter in weight and having a stable and reliable installation structure. Specifically, the longitudinal grooves and transverse grooves distributed at intervals are staggered on the front and back sides to improve the deformation resistance of the entire trailer door panel. The combination of the inner and outer layers of steel plates and the foamed plastic core layer can greatly reduce the weight of the door panel while improving the heat insulation effect. The strengthening frame can further improve the strength of the door panel, especially ensuring the structural stability of the door panel after installation.

[0010] As a further improvement of the above solution, the four sides of the outer wall layer are provided with folded edges bent inwards.

[0011] The technical effect of the above improvement is that the folded edges of the four sides of the outer wall layer make the outer wall layer form a box shape, which is convenient for filling the foamed plastic core layer and the reinforcing frame components inside.

[0012] As a further improvement of the above solution, a gap for placing the reinforcement frame is left between the two ends of the longitudinal groove on the outer wall layer and the edge of the outer wall layer. The length of the longitudinal groove on the outer wall layer is shorter than the length of the outer wall layer, so that a certain distance is left between the two ends of the longitudinal groove and the edge of the outer wall layer, thereby facilitating the accommodation of the reinforcement frame component.

[0013] The technical effects of the above improvements are:

[0014] As a further improvement of the above solution, gaps for placing a reinforcement frame are left between the two ends of the transverse groove on the inner wall layer and the edge of the inner wall layer.

[0015] The technical effect of the above improvement is that the length of the transverse groove on the inner wall layer is shorter than the width of the inner wall layer, so that both ends of the transverse groove are at a certain distance from the edge of the inner wall layer, thereby facilitating the accommodation of the strengthening frame component.

[0016] As a further improvement of the above solution, the outer wall of the protective paint layer is provided with a protective film.

[0017] The technical effect of the above improvement is: it plays a protective role on the protective paint layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the outer wall structure of the trailer door panel.

[0019] Figure 2 Schematic diagram of the inner wall structure of the trailer door panel.

[0020] Figure 3 It is a schematic diagram of the partially enlarged structure of the outer wall layer of the trailer door panel.

[0021] Figure 4 This is a schematic diagram of a reinforcement frame structure installed in the outer wall layer.

[0022] Figure 5 It is a cross-sectional structural schematic diagram of the utility model.

[0023] Figure 6 It is a schematic diagram of the structure after the cross-sectional structure of the utility model is enlarged.

[0024] Figure 7 It is a schematic diagram of the side cross-sectional structure of the inner wall layer.

[0025] Figure 8 It is a schematic diagram of the end face structure of the inner wall layer.

[0026] In the figure: 1, outer wall layer; 2, inner wall layer; 3, reinforcement frame; 4, foamed plastic core layer; 5, protective paint layer; 6, protective film; 11, longitudinal groove; 12, folded edge; 21, transverse groove. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution, the utility model is described in detail below in conjunction with embodiments. The description in this section is only exemplary and explanatory and should not have any limiting effect on the protection scope of the utility model.

[0028] like Figure 1-8 As shown, the specific scheme of this embodiment is: a steel-plastic composite trailer door panel, including a foamed plastic core layer 4 and an outer wall layer 1 and an inner wall layer 2 respectively located on both sides of the foamed plastic core layer 4, the outer wall layer 1 is provided with inwardly concave strip-shaped longitudinal grooves 11, and the inner wall layer 2 is provided with inwardly concave strip-shaped transverse grooves 21; the foamed plastic core layer 4 is arranged in contact with the inner wall surfaces of the inner wall layer 2 and the outer wall layer 1, and connected together by an adhesive layer; the inner wall layer 2 and the outer wall layer 1 are steel plates, and the outer walls of the steel plates are provided with a protective paint layer 5; the edge of the foamed plastic core layer 4 is provided with a reinforcement frame 3 composed of a metal pipe or profile.

[0029] Specifically, the foamed plastic core layer 4 is composed of a mixture of high-density resin and low-density resin, and a high-density resin (HDPE) and a low-density resin (LDPE) are selected, and the mass ratio of HDPE:LDPE is in the range of 10:1 to 1:2, preferably 9:1. The model of HDPE can be, for example, 8010 or 5000S, and the LDPE can be, for example, 6634F or 2426H. The preferred pairing is that HDPE uses 8010 and LDPE uses 6634F; or HDPE uses 5000S and LDPE uses 2426H; the foaming agent is a composite foaming agent, and the foaming agent raw powder uses the commonly used AC (or ADC) foaming agent, and the chemical name is azodicarbonyl. The foamed plastic core layer 4 is molded by a mold, and the surface needs to have grooves that match the outer wall layer and the inner wall layer.

[0030] The choice of bonding layer material, the bonding layer material is made of polymer material, the bonding layer material used in the board composite is in film form, so it is also called polymer film. After a lot of experiments, we finally chose a bonding polymer material (model Bynel-41E755) produced by DuPont of the United States as the main component of the polymer film.

[0031] Steel plate material selection: In order to ensure the bending strength and shear strength of the composite plate, according to the classification in the National Standard of the People's Republic of China GB / T2518-2004, the structural grade 550 steel plate is preferred, or according to the classification of ASTMA653 / A653M-05, the Ss (Structural Steel) 550 grade steel plate is preferred; the steel plate is pressed so that the outer wall layer forms a longitudinal groove and the inner wall layer forms a transverse groove. The thickness of the steel plate can be 1.2mm.

[0032] Selection of protective paint layer: In order to ensure that the steel plate surface coating has high weather resistance and wind and sand abrasion resistance, Akzo silicon modified polyester coating is preferred as the main coating material of the steel plate; after the steel plate is rolled and tempered, it is galvanized or aluminum zinc plated, and then the surface is painted. In order to ensure the firmness of the coating, epoxy primer is pre-coated in advance.

[0033] Protective film: A layer of polyester protective film with a thickness of 0.02 mm is provided on the outer wall of the protective paint layer 5 to prevent the paint layer from being scratched and faded.

[0034] Reinforced frame structure: The reinforced frame can be made of 2mm thick aluminum alloy square tubes, or 1.5mm thick rectangular steel tubes. The reinforced frame is composed of four tubes or profiles to form a rectangular frame body installed in the box body formed by the outer wall layer. The size matches the edge of the foamed plastic core layer 4 to provide additional support and protection.

[0035] The outer wall layer 1 is provided with folded edges 12 bent inwardly on four sides.

[0036] There is a gap between the two ends of the longitudinal groove 11 on the outer wall layer 1 and the edge of the outer wall layer 1 for placing the reinforcing frame 3 .

[0037] There is a gap between the two ends of the transverse groove 21 on the inner wall layer 2 and the edge of the inner wall layer 2 for placing the reinforcing frame 3 .

[0038] The outer wall of the protective paint layer 5 is provided with a protective film 6 .

[0039] Process:

[0040] 1. A foamed plastic core layer 4 is manufactured, the size of which is slightly smaller than the outer wall layer 1 and just fills into the outer wall layer 1. A groove structure matching the longitudinal groove 11 of the outer wall layer 1 or the transverse groove 21 of the inner wall layer 2 is pre-formed on the surface of the foamed plastic core layer 4.

[0041] 2. The outer wall layer 1 and the inner wall layer 2 are manufactured, and their dimensions are the same as those of the trailer door panel, and strip-shaped longitudinal grooves 11 and transverse grooves 21 are formed on the steel plate. The groove depth can be 2 mm, the width is 10 mm, and the spacing is 200 mm.

[0042] 3. The foamed plastic core layer 4 is connected with the inner wall layer 2 and the outer wall layer 1 by forming an adhesive layer with a polyurethane adhesive.

[0043] 4. Folding edges 12 are provided on the four sides of the outer wall layer 1. The width of the folding edges 12 is designed according to the thickness requirement of the door panel, for example, 20 mm, so as to enhance the structural stability of the door panel.

[0044] 5. A reinforcement frame 3 is arranged at the edge of the foamed plastic core layer 4. The reinforcement frame 3 is made of, for example, an aluminum alloy square tube with a thickness of 2 mm to provide additional support and protection.

[0045] The steel-plastic composite trailer door panel of the utility model has longitudinal grooves distributed at intervals on the front side, and transverse grooves distributed at intervals on the back side; since the longitudinal grooves and the transverse grooves are in different directions and the front and back sides are staggered, the deformation resistance of the entire trailer door panel can be improved; the combination of the inner and outer two layers of steel plates and the foamed plastic core layer can greatly reduce the weight of the door panel and improve the heat insulation effect; the strength of the door panel can be further improved by the reinforcement frame, and the existence of the reinforcement frame can make the connection between the door panel and the parts when installing the semi-trailer more stable, thereby ensuring the structural stability of the door panel after installation.

[0046] It should be noted that, in this article, the terms include, contain or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Specific examples are used in this article to illustrate the principle and implementation of the technical solution of the utility model. The above examples are only used to help understand the method and core idea of ​​the utility model. The above are only preferred implementations of the utility model. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, for ordinary technicians in this technical field, without departing from the principle of the utility model, several improvements, modifications or changes can be made, and the above technical features can also be combined in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the protection scope of the utility model.

Claims

1. A steel-plastic composite trailer door panel, comprising a foamed plastic core layer (4) and an outer wall layer (1) and an inner wall layer (2) respectively located on both sides of the foamed plastic core layer (4), characterized in that: The outer wall layer (1) is provided with inwardly recessed strip-shaped longitudinal grooves (11), and the inner wall layer (2) is provided with inwardly recessed strip-shaped transverse grooves (21); the foamed plastic core layer (4) is arranged in contact with the inner wall surfaces of the inner wall layer (2) and the outer wall layer (1), and connected together by an adhesive layer; the inner wall layer (2) and the outer wall layer (1) are steel plates, and the outer walls of the steel plates are provided with a protective paint layer (5); the edge of the foamed plastic core layer (4) is provided with a reinforcement frame (3) composed of a metal pipe or profile.

2. The steel-plastic composite trailer door panel according to claim 1, characterized in that: The outer wall layer (1) is provided with folded edges (12) bent inwardly on four sides.

3. The steel-plastic composite trailer door panel according to claim 1, characterized in that: Both ends of the longitudinal groove (11) on the outer wall layer (1) leave gaps for placing the reinforcing frame (3) away from the edge of the outer wall layer (1).

4. The steel-plastic composite trailer door panel according to claim 1, characterized in that: Both ends of the transverse groove (21) on the inner wall layer (2) leave gaps for placing the reinforcement frame (3) away from the edge of the inner wall layer (2).

5. The steel-plastic composite trailer door panel according to claim 1, characterized in that: The outer wall of the protective paint layer (5) is provided with a protective film (6).

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