Process for connecting upper cover and lower cover of front-opening injection molding draw-bar box

Abstract

The invention relates to the technical field of draw-bar boxes, and discloses a front-opening injection molding draw-bar box upper and lower cover connecting process which comprises the following steps: S1, designing and manufacturing, designing and manufacturing an injection mold, S2, injection molding, carrying out injection molding operation according to an injection molding draw-bar box model established in S1, and S3, deburring and cleaning. S4, mounting connecting pieces: mounting the connecting pieces at independent injection molding parts such as an upper cover and a lower cover, and S5, connecting the upper cover and the lower cover, and connecting the upper cover and the lower cover which are subjected to injection molding through the connecting pieces so as to complete the integral mounting of the injection molding draw-bar box. The upper cover and the lower cover are connected through the snap fasteners, so that the connection of the upper cover and the lower cover is firmer, and the overall structural strength and stability of the injection molding draw-bar box are effectively improved. Due to the matching of the snap fasteners, when the upper cover and the lower cover are subjected to external force, the pressure can be better dispersed, and the risk of edge breakage caused by zipper connection is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of trolley cases, in particular to a process for connecting upper and lower covers of a front-opening injection-molded trolley case. Background Art

[0002] Injection molded suitcases are a type of suitcase made using the injection molding process. The body of a suitcase made using the injection molding process is usually formed in one piece, and has high strength and stability. Compared to traditional soft suitcases or suitcases made using other processes, injection molded suitcases are more structurally sturdy and can better protect the items inside the suitcase.

[0003] In the prior art, injection molded trolley cases are widely used in various travel occasions, such as business trips, vacations, visiting relatives and friends, etc. Whether traveling by plane, train or car, injection molded trolley cases can provide reliable protection for the luggage stored inside. In the manufacturing process, people often use injection molding technology to manufacture the outer shell main structure of the trolley case, and use a zipper to connect its upper cover and lower cover.

[0004] However, in actual use, since a zipper is used to connect the upper and lower covers, the rigidity of the connection between the upper and lower covers of the injection-molded trolley case is poor. When subjected to external pressure, the zipper connection will be dented due to deformation, and the curved edges of the upper and lower covers of the injection-molded trolley case are prone to breakage. In view of this, we propose a process for connecting the upper and lower covers of a front-opening injection-molded trolley case. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a process for connecting the upper and lower covers of a front-opening injection-molded trolley case, which solves the problem in the prior art that the upper and lower covers of the injection-molded trolley case connected by zippers are prone to plastic deformation risks at their edges when under pressure.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A process for connecting the upper and lower covers of a front-opening injection-molded trolley case, comprising the following steps:

[0007] S1: Design and Manufacturing

[0008] Design and manufacture injection molds to ensure that the size and shape of the upper and lower covers match, and perform modeling and mechanical simulation tests on the appearance of the upper and lower covers;

[0009] S2: Injection molding

[0010] Use an injection molding machine to inject plastic material into a mold to form the upper and lower covers of the suitcase respectively;

[0011] S3: Deburring and Cleaning

[0012] Remove burrs and impurities from the surface of the upper and lower covers, and perform cleaning and surface polishing;

[0013] S4: Install the connector

[0014] Install connecting parts at the connection parts of the upper and lower covers, including hinges, locks, and zippers;

[0015] S5: Connect the upper and lower covers

[0016] Connect the upper and lower covers through connectors and perform a connection strength test.

[0017] Preferably, during the design and manufacturing process of S1, through holes with a spacing of 40-60 mm are opened at the sealing strip according to the size of the box body, and the diameter of the opened through holes matches the diameter of the sealing block.

[0018] Preferably, during the design and manufacturing process of S1, tie rods with an interval of 10-20mm are set for the frame at the connection between the upper and lower covers, and the thickness of the tie rods is 1mm and the material is aluminum-lithium alloy. Sub-buttons and female buckles are correspondingly arranged on the inner sides of the upper cover and the lower cover, and a threaded through hole is opened at the center of the sub-button.

[0019] Preferably, during the design and manufacturing process of S1, the thickness of the through hole opened at the sealing strip is 2-5mm greater than the thickness of the main frame, and the upper cover and the lower cover are made of corrosion-resistant metal material within a range of 5mm in diameter with the through hole as the center.

[0020] Preferably, during the design and manufacturing process of S1, L-shaped tie bars are provided in front and behind the through holes on the outer surfaces of the upper cover and the lower cover, and a sealing block made of rubber material is provided on the outside of each group of through holes, and the gap between two tie bars in the same group is the same as the shape of the sealing block.

[0021] Preferably, two groups of threaded through holes are provided at the lower ends of the upper cover and the lower cover in the S4 mounting connector, and the universal wheel is connected by threaded connection. The thickness of the threaded through holes of the upper cover and the lower cover is 3-7 mm greater than that of the arc surface.

[0022] Preferably, in the S5 connection between the upper and lower covers, the sub-buckle at the upper cover is first buckled with the female buckle at the lower cover, and the protrusion of the sub-buckle is kept able to be embedded in the through hole at the center of the inner surface of the female buckle, and finally the sub-buckle and female buckle are connected with screws.

[0023] Preferably, in the S4 mounting connector, the inner side of the upper cover is set as a female buckle, and the inner side of the lower cover is set as a sub-buckle, the lower end of the sub-buckle protrudes 5-10mm above the lower cover, and the lower edge of the female buckle is flush with the lower edge of the upper cover.

[0024] Preferably, the sub-buckle and the female buckle are connected by bolts and nuts, and a flat washer and a spring washer are respectively provided at the connection between the bolt and the sub-buckle.

[0025] Preferably, the lower end of the sub-button and the upper end of the mother buckle are both provided with triangular prism-shaped reinforcing ribs, and the ends of the reinforcing ribs away from the sub-button and the mother buckle are fixedly connected to the lower cover and the upper cover respectively.

[0026] The present invention provides a process for connecting the upper and lower covers of a front-opening injection-molded trolley case. It has the following beneficial effects:

[0027] 1. The present invention makes the connection between the upper and lower covers more secure by establishing a snap-on connection between the upper and lower covers, effectively improving the overall structural strength and stability of the injection-molded trolley case. Due to the cooperation of the snap-on connection, the upper and lower covers can better disperse the pressure when subjected to external forces, avoiding the risk of edge breakage caused by the zipper connection.

[0028] 2. The present invention further enhances the rigidity of the connection part by arranging reinforcing ribs at the connection of the upper and lower covers, so that the connection part is not easily deformed when the injection molded trolley case is subjected to pressure, thereby improving the durability and service life of the product.

[0029] 3. The present invention adopts bolts and nuts to connect the sub-buckle and the female buckle, and arranges flat washers and spring washers at the connection, which not only ensures the firmness of the connection, but also can absorb certain vibrations and impacts, so that the injection molded trolley case is more stable and reliable during use.

[0030] 4. The present invention effectively prevents the intrusion of dust and moisture through the design of sealing strips and sealing blocks, protects the safety of items in the box, and also improves the waterproof performance of the injection molded trolley case.

[0031] 5. The present invention makes the universal wheels at the bottom of the trolley case more stable by thickening the connection of the universal wheels and connecting the universal wheels with bolts, thereby enhancing the mobility and load-bearing capacity of the trolley case and preventing it from being easily deformed under load. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A perspective view of the present invention;

[0033] Figure 2 It is a schematic diagram of the lower cover of the present invention;

[0034] Figure 3 This is a schematic diagram of the upper and lower covers in connection with each other according to the present invention;

[0035] Figure 4 It is a schematic diagram of the upper cover of the present invention;

[0036] Figure 5 It is a schematic diagram of the cross section of the curved edge of the present invention;

[0037] Figure 6It is a schematic diagram of the straight edge of the present invention. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Example:

[0040] Please see attached Figure 1 -Attached Figure 6 The embodiment of the present invention provides a process for connecting the upper and lower covers of a front-opening injection-molded suitcase, comprising the following steps:

[0041] S1: Design and Manufacturing

[0042] Design and manufacture injection molds to ensure that the size and shape of the upper and lower covers match, and perform modeling and mechanical simulation tests on the appearance of the upper and lower covers;

[0043] The mechanical simulation experiment is carried out using ANSYS software to ensure the rationality and reliability of the design, including the following steps:

[0044] 1. Create a geometric model

[0045] Importing Geometry

[0046] Import the CAD model of the suitcase into ANSYS software or use the modeling tools provided by ANSYS to create a geometric model, and verify the accuracy and completeness of the geometric model, including the box body, tie rods, wheels and other components.

[0047] Simplified Model

[0048] According to the purpose of analysis and accuracy requirements, the geometric model is appropriately simplified to reduce the amount of calculation.

[0049] 2. Define Material Properties

[0050] Select Material Model

[0051] According to the material type of the injection molded suitcase, select the appropriate material model. Common material models include linear elastic model, nonlinear elastic model, plastic model, etc., and set the material parameters such as elastic modulus, Poisson's ratio, yield strength, etc.

[0052] Defining Material Properties

[0053] Assign corresponding material properties to different parts of the geometric model. For example, the box body uses aluminum-lithium alloy material, the tie rod uses aluminum alloy material, and the wheel uses polyurethane material.

[0054] 3. Grid Division

[0055] Select the mesh type

[0056] According to the shape of the geometric model and the requirements of the analysis, select the appropriate mesh type. And select meshes according to the different materials of the injection-molded suitcase, including tetrahedral meshes, hexahedral meshes, hybrid meshes and other types, while considering the density and quality of the mesh to ensure the accuracy and efficiency of the calculation.

[0057] Meshing

[0058] Use the meshing tool of ANSYS software to mesh the geometric model, and manually control the size and density of the mesh. For the straight edges of the injection-molded suitcase, the automatic meshing function can be used. At the same time, check the quality of the mesh to ensure that there are no deformed units and incorrect connections.

[0059] 4. Apply loads and constraints

[0060] Determine the load type

[0061] According to the actual situation, determine the type of load that the injection molded suitcase is subjected to, such as gravity, tension, pressure, impact, etc., while considering the size, direction and action time of the load.

[0062] Apply load

[0063] Use the load application tool of ANSYS software to apply the determined load to the geometric model. You can apply concentrated loads at specific locations or distribute loads on the entire model and ensure that the load application method is consistent with the actual situation.

[0064] Defining Constraints

[0065] According to the actual situation, determine the constraint conditions of the injection molded trolley case. For example, apply fixed constraints to the wheels fixed to the ground, apply displacement constraints to the connection of the drawbars, and apply the constraint conditions to the geometric model.

[0066] 5. Solution and Post-processing

[0067] Select Solver

[0068] Select the appropriate solver according to the type and requirements of the analysis. ANSYS software provides a variety of solvers, such as static solvers, dynamic solvers, and transient solvers. At the same time, set the parameters of the solver, such as solution accuracy, convergence criteria, etc.

[0069] Solving the Model

[0070] Run the solver to solve the stress simulation model. The solution process may take some time, depending on the complexity of the model and the performance of the computer;

[0071] According to different unit types (such as tetrahedral unit, hexahedral unit, etc.), a specific formula is used to calculate the unit stiffness matrix. Taking the three-dimensional solid unit as an example, its unit stiffness matrix k e The calculation formula is:

[0072]

[0073] Where B is the strain matrix, which is related to the shape function and nodal displacement of the element; D is the constitutive matrix of the material, which is determined by material parameters such as elastic modulus and Poisson's ratio; V is the volume of the element.

[0074] S2: Injection molding

[0075] Use an injection molding machine to inject plastic material into a mold to form the upper and lower covers of the suitcase respectively;

[0076] S3: Deburring and Cleaning

[0077] Remove burrs and impurities from the surface of the upper and lower covers, and clean and polish the surface;

[0078] S4: Install the connector

[0079] Install connecting parts at the connection parts of the upper and lower covers, including hinges, locks, and zippers;

[0080] S5: Connect the upper and lower covers

[0081] Connect the upper and lower covers through connectors and perform a connection strength test.

[0082] During the design and manufacturing process of S1, through holes with a spacing of 40-60 mm are opened at the sealing strip according to the size of the box body, and the diameter of the through holes is matched with the diameter of the sealing block. Since the diameter of these through holes matches the diameter of the sealing block, the tightness of the sealing effect of the injection molded trolley case is ensured.

[0083] During the design and manufacturing process of S1, tie rods with an interval of 10-20 mm are set on the frame at the connection between the upper and lower covers, and the thickness of the tie rods is 1 mm and the material is aluminum-lithium alloy. The inner sides of the upper cover and the lower cover are correspondingly provided with sub-buckles and mother buckles, and a threaded through hole is opened at the center of the sub-buckle. Tie rods with an interval of 10 to 20 mm are set on the frame at the connection between the upper and lower covers. The thickness of these tie rods is 1 mm and they are made of aluminum-lithium alloy to reduce the overall weight of the injection molded trolley case while maintaining the overall structural strength of the injection molded trolley case.

[0084] During the design and manufacturing process of S1, the thickness of the through hole opened at the sealing strip is 2-5mm greater than the thickness of the main frame, and the upper cover and the lower cover are made of corrosion-resistant metal material within a range of 5mm in diameter with the through hole as the center, so as to avoid corrosive substances entering the inner part of the snap fastener due to erosion by the external environment, thereby affecting the tightness of the connection between the snap fasteners.

[0085] During the design and manufacturing process of S1, L-shaped tie bars are opened in front and behind the through holes on the outer surfaces of the upper cover and the lower cover, and a rubber sealing block is arranged on the outside of each group of the through holes. The gap between the two tie bars in the same group is the same as the shape of the sealing block. Therefore, the sealing block can be embedded between two adjacent tie bars during the installation process, and the position of the installed sealing block can be limited by the tie bars.

[0086] The upper cover and the lower cover of the S4 mounting connector are provided with two sets of threaded through holes at their lower ends, and the universal wheels are connected by threaded connection. The thickness of the threaded through holes of the upper cover and the lower cover is 3-7mm greater than that of the arc surface, so that the threaded connection part can provide sufficient strength and stability when subjected to force. At the same time, the installation position of the universal wheel has been carefully designed to ensure the flexibility and stability of the trolley case during movement. In addition, mechanical simulation experiments are conducted to verify the impact resistance of the trolley case when it falls accidentally.

[0087] In the S5 connection between the upper and lower covers, the sub-buckle at the upper cover is first buckled with the female buckle at the lower cover, and the protrusion of the sub-buckle is kept able to be embedded in the through hole at the center of the inner surface of the female buckle, and finally the sub-buckle and female buckle are connected with screws to maintain the tightness of the connection between the upper and lower covers.

[0088] In the S4 installation connector, the inner side of the upper cover is set as a female buckle, and the inner side of the lower cover is set as a sub-buckle. The lower end of the sub-buckle protrudes above the lower cover by 5-10mm, and the lower edge of the female buckle is flush with the lower edge of the upper cover. Since the lower end of the sub-buckle protrudes above the lower cover, this not only increases the strength of the connector, but also makes it easier for the user to accurately find the connection position during operation.

[0089] In addition, in order to further improve the durability and reliability of the connector, the surface of the mother buckle and the sub buckle are specially treated to increase the friction coefficient, so that it is not easy to loosen after connection. At the same time, this design also makes the S4 mounting connector have better performance when subjected to tension and pressure, ensuring long-term stability.

[0090] The sub-buckle and the female buckle are connected by bolts and nuts, and a flat washer and a spring washer are respectively provided at the connection between the bolt and the sub-buckle to ensure the stability of the connection. At the other end of the bolt, the female buckle is fixed by a nut to form a reliable connection structure. This design not only improves the tensile strength of the connector, but also makes it more convenient to disassemble and maintain.

[0091] The lower end of the sub-button and the upper end of the mother buckle are both provided with triangular prism-shaped reinforcing ribs. The ends of the reinforcing ribs away from the sub-button and the mother buckle are fixedly connected to the lower cover and the upper cover respectively. The provision of the reinforcing ribs not only improves the connection strength between the sub-button and the mother buckle, but also increases the stability of the overall structure to a certain extent. By fixedly connecting the reinforcing ribs to the upper and lower covers, the entire buckling device has better anti-deformation ability when subjected to tension or pressure. In addition, the triangular prism-shaped design makes the reinforcing ribs more compact in structure, which helps to reduce the use of materials while maintaining high strength and rigidity. In practical applications, this design not only improves the durability of the product, but also reduces production costs.

[0092] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for connecting the upper and lower covers of a front-opening injection-molded suitcase, characterized in that: The following steps are involved: S1: Design and Manufacturing Design and manufacture injection molds to ensure that the size and shape of the upper and lower covers match, and perform modeling and mechanical simulation tests on the appearance of the upper and lower covers; S2: Injection molding Use an injection molding machine to inject plastic material into a mold to form the upper and lower covers of the suitcase respectively; S3: Deburring and Cleaning Remove burrs and impurities from the surface of the upper and lower covers, and perform cleaning and surface polishing; S4: Install the connector Install connecting parts at the connection parts of the upper and lower covers, including hinges, locks, and zippers; S5: Connect the upper and lower covers Connect the upper and lower covers through connectors and perform a connection strength test.

2. A process for connecting the upper and lower covers of a front-opening injection-molded suitcase according to claim 1, characterized in that: During the design and manufacturing process of S1, through holes with a spacing of 40-60 mm are opened at the sealing strip according to the size of the box, and the diameter of the through holes is matched with the diameter of the sealing block.

3. The process for connecting the upper and lower covers of a front-opening injection-molded suitcase according to claim 1, characterized in that: During the design and manufacturing process of the S1, tie rods with an interval of 10-20mm are set on the frame at the connection between the upper and lower covers, and the thickness of the tie rods is 1mm and the material is aluminum-lithium alloy. Sub-buckles and female buckles are correspondingly set on the inner sides of the upper cover and the lower cover, and a threaded through hole is opened in the center of the sub-buckle.

4. The process for connecting the upper and lower covers of a front-opening injection-molded suitcase according to claim 2, characterized in that: During the design and manufacturing process of S1, the thickness of the through hole opened at the sealing strip is 2-5mm greater than the thickness of its main frame, and the upper cover and the lower cover are made of corrosion-resistant metal material within a range of 5mm in diameter with the through hole as the center.

5. The process for connecting the upper and lower covers of a front-opening injection-molded suitcase according to claim 2, characterized in that: During the design and manufacturing process of S1, L-shaped tie bars are opened in front and behind the through holes on the outer surfaces of the upper cover and the lower cover, and a rubber sealing block is arranged on the outside of each group of through holes, and the gap between the two tie bars in the same group is the same as the shape of the sealing block.

6. The process for connecting the upper and lower covers of a front-opening injection-molded suitcase according to claim 1, characterized in that: The upper cover and the lower cover of the S4 mounting connector are provided with two sets of through threaded holes at their lower ends, and are connected to the universal wheel by threaded connection. The thickness of the threaded holes of the upper cover and the lower cover is 3-7mm greater than that of the arc surface.

7. The process for connecting the upper and lower covers of a front-opening injection-molded suitcase according to claim 1, characterized in that: In the S5 connection between the upper and lower covers, the sub-buckle at the upper cover is first buckled with the female buckle at the lower cover, and the protrusion of the sub-buckle is kept able to be embedded in the through hole at the center of the inner surface of the female buckle, and finally the sub-buckle and female buckle are connected with screws.

8. The process for connecting the upper and lower covers of a front-opening injection-molded suitcase according to claim 1, characterized in that: In the S4 mounting connector, the inner side of the upper cover is set as a female buckle, and the inner side of the lower cover is set as a sub-buckle. The lower end of the sub-buckle protrudes 5-10mm above the lower cover, and the lower edge of the female buckle is flush with the lower edge of the upper cover.

9. A process for connecting the upper and lower covers of a front-opening injection-molded suitcase according to claim 8, characterized in that: The sub-buckle and the female buckle are connected by bolts and nuts, and a flat washer and a spring washer are respectively arranged at the connection between the bolt and the sub-buckle.

10. A process for connecting the upper and lower covers of a front-opening injection-molded suitcase according to claim 9, characterized in that: The lower end of the sub-button and the upper end of the mother buckle are both provided with triangular prism-shaped reinforcing ribs, and the ends of the reinforcing ribs away from the sub-button and the mother buckle are fixedly connected to the lower cover and the upper cover respectively.

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