Plastic shell connecting structure

Abstract

The utility model discloses a plastic shell connecting structure which comprises a main body welding rib part arranged along the edge of a first shell and a main body welding groove part arranged along the edge of a second shell. The main body welding rib part comprises a first bottom plate and a first rib plate connected to one side of the first bottom plate; the main body welding groove part comprises a second bottom plate and a first groove plate connected to one side of the second bottom plate, and a welding groove channel is formed among the first groove plate, the second bottom plate and the second shell; a second groove plate and a third groove plate are arranged on the first bottom plate and the second bottom plate respectively, a movable mold fixing groove is formed among the second groove plate, the first bottom plate and the first shell, and a fixed mold fixing groove is formed among the third groove plate, the second bottom plate and the second shell; the first rib plate is connected with the second bottom plate through friction welding; after welding, the edge of the first shell is tightly attached to the edge of the second shell. The utility model can meet the requirement of high protection level, has the advantages of simple integral structure, easiness in assembly, light weight and small volume, and can improve the productivity of a production line and reduce the material cost and the transportation cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of shell processing, in particular to a plastic shell connection structure. Background Art

[0002] Plastic casings are common components in various mechanical and electronic equipment. They protect internal components and are waterproof and dustproof. Different devices have different requirements for the protection level (IP) of the casing. Generally speaking, the highest dustproof level is level 6, while the highest waterproof level is level 8.

[0003] Plastic shells are usually made of two or more shells. The overall protection effect of the shell mainly depends on the sealing effect of the joints of different parts of the shell. The assembly method between the two parts of the shell is generally through the ribs and grooves with matching shapes on the edges, and then a number of bolts or buckles are added at the joints to prevent loosening as needed. The structure of the ribs and grooves is usually relatively simple. For example, the ribs and grooves with V-shaped or U-shaped cross-sections are engaged with each other, and the seal is formed by the corresponding contact between the two side surfaces.

[0004] This type of connection structure and its assembly method are widely used in products with low protection level requirements. However, with the development of science and technology and the continuous improvement of industrial level, the processing of various products has become more and more sophisticated, and the performance requirements have become higher and higher. The problems existing in the traditional plastic shell connection structure have become increasingly prominent, such as: (1) There are still tiny gaps between the ribs and grooves, which poses a risk of leakage and cannot meet the IP67 waterproof and dustproof requirements; (2) The use of bolts or buckles for fastening is to add materials to the shell, which increases the weight and size of the product, and thus requires more production and transportation costs; (3) The shell assembly process using bolts or buckles for fastening is slow and has low processing efficiency, which affects production capacity and reduces the economic benefits of the production line. In response to problem (1), the prior art generally improves the sealing of the shell by setting a sealing strip, but the use of the sealing strip increases the difficulty of assembly, is prone to aging and failure, and has a short service life, so it still cannot completely solve the above problems. Utility Model Content

[0005] The utility model is developed to solve the above problems, and aims to provide a plastic shell connection structure which has a high protection level and is easy to produce.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A plastic shell connection structure, used to connect a first shell and a second shell, comprises a main body welding rib portion arranged along the edge of the first shell and outside the first shell, and a main body welding groove portion arranged along the edge of the second shell and outside the second shell, wherein:

[0008] The main body welding rib portion includes a first bottom plate extending vertically outward from the first shell surface and a first rib plate connected to the first bottom plate on one side facing the main body welding groove portion;

[0009] The main body welding groove portion includes a second bottom plate extending vertically outward from the surface of the second shell and a first groove plate connected to the second bottom plate on one side facing the first bottom plate, and a welding groove for inserting the first rib plate is formed between the first groove plate, the second bottom plate and the second shell;

[0010] A second slot plate and a third slot plate are respectively provided on the opposite sides of the first bottom plate and the second bottom plate, a movable mold fixing slot for a movable mold of a welding device to be clamped is formed between the second slot plate, the first bottom plate and the first shell, and a fixed mold fixing slot for a fixed mold of a welding device to be clamped is formed between the third slot plate, the second bottom plate and the second shell;

[0011] The main body welding rib part and the main body welding groove part are both made of thermoplastic plastic material, and the first rib plate and the second bottom plate are connected by friction welding;

[0012] After welding, the edge of the first shell is tightly fitted with the edge of the second shell.

[0013] Preferably, the groove width D of the movable mold fixing groove and the fixed mold fixing groove is 1 , D 2 Both are 4.0mm~6.0mm.

[0014] Furthermore, the movable mold of the welding equipment performs friction welding by reciprocating in a direction perpendicular to the first groove plate, and a plurality of reinforcing weld ribs perpendicular to the first groove plate are arranged at the bottom of the welding groove, and the plurality of reinforcing weld ribs are evenly arranged along the length direction of the welding groove.

[0015] Preferably, the width W of a single reinforcing rib is 1 The length is 1mm to 2mm, the length is consistent with the width of the welding groove, and the height H 1 The distance D between two adjacent reinforcing ribs is 0.5mm to 1mm. 3 It is 2mm to 3mm.

[0016] Furthermore, the thickness H of the first rib is 2 It is 1mm~3mm.

[0017] Preferably, the length L of the first rib before welding is 1 Greater than the depth H of the welding groove 3 , the thickness of the second bottom plate before welding H 4 1.5mm~3.0mm, the length of the first rib before welding is L 1 The distance D between the first bottom plate and the second bottom plate after welding 4 The difference is 1mm~2mm.

[0018] Furthermore, when the edge of the first shell body is attached to the edge of the second shell body, a gap D of 0.5 mm to 2 mm is left between the first groove plate and the first bottom plate. 5 .

[0019] Furthermore, the shell formed by the first shell and the second shell has an opening; both ends of the main body weld rib portion are provided with end weld rib portions connected to the main body weld rib portion, and both ends of the main body weld groove portion are provided with end weld groove portions connected to the main body weld groove portion, the end weld rib portion includes a third bottom plate extending vertically outward from the surface of the first shell and a second rib plate connected to the third bottom plate on one side of the end weld groove portion, the end weld groove portion includes a fourth bottom plate extending vertically outward from the surface of the second shell and a fourth groove plate connected to the fourth bottom plate on one side of the third bottom plate, and a welding groove for inserting the second rib plate is formed between the fourth groove plate, the fourth bottom plate and the second shell; the end weld rib portion and the end weld groove portion are made of thermoplastic plastic material, the second rib plate and the fourth bottom plate are connected by friction welding, and after welding and fixing, the edge of the first shell is tightly fitted with the edge of the second shell, and the fourth groove plate and the third bottom plate are also tightly fitted with each other.

[0020] Furthermore, the plastic shell connection structure also includes: a waterproof baffle connected to the outside of the terminal weld rib portion or the terminal weld groove portion, the cross-section of the waterproof baffle is an inverted L-shape, and is used to cover the connection between the terminal weld rib portion and the terminal weld groove portion. If the first shell is located above the second shell when the product is working, the waterproof baffle is arranged on an end of the third bottom plate away from the first shell; if the second shell is located above the first shell, the waterproof baffle is arranged on an end of the fourth bottom plate away from the second shell.

[0021] Furthermore, the tail end of the waterproof baffle is provided with an end baffle bent toward the first shell and the second shell, and the end baffle is parallel to the end face of the end weld rib portion / end weld groove portion and is used to shield the end face.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] 1. Compared with the traditional bolt and buckle reinforcement methods, the plastic shell connection structure of the utility model has the advantages of light weight and small volume, which can reduce material costs and transportation costs.

[0024] 2. The plastic shell connection structure of the utility model has a simple overall structure and is easy to assemble, which can reduce time costs and improve production line capacity.

[0025] 3. The plastic shell connection structure of the utility model is sealed by friction welding. After welding, the first rib plate is connected to the second bottom plate to form a first line of protection, and the edge of the first shell is tightly attached to the edge of the second shell to form a second line of protection, which can meet high-level protection requirements.

[0026] 4. The plastic shell connection structure of the utility model is arranged on the outside of the shell and can be applied to shells of various sizes and wall thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a cross-sectional view of the plastic shell connection structure of Example 1 before welding;

[0028] Figure 2 is a cross-sectional view of the plastic shell connection structure of Example 1 after welding;

[0029] Figure 3 It is a schematic structural diagram of the fixed die fixing groove and the reinforcing welding ribs of Example 1;

[0030] Figure 4 is a partial enlarged view of the plastic shell connection structure of Example 2 at the shell opening;

[0031] Figure 5 It is a cross-sectional view of the plastic shell connection structure of Example 2 after welding.

[0032] Figure Number:

[0033] 1-first shell, 2-second shell, 3-opening;

[0034] 10-main body welding rib part, 11-first bottom plate, 12-first rib plate, 13-second slot plate, 14-movable mold fixing slot;

[0035] 20-main body welding groove part, 21-second bottom plate, 22-first groove plate, 23-third groove plate, 24-fixed mold fixing groove, 25-reinforced welding rib;

[0036] 30-end welding rib part, 31-third bottom plate, 32-second rib plate;

[0037] 40-end welding groove portion, 41-fourth bottom plate, 42-fourth groove plate;

[0038] 50-waterproof baffle, 51-end baffle. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the following embodiments are combined with the accompanying drawings to specifically illustrate the plastic shell connection structure of the present invention.

[0040] Example 1

[0041] like Figure 1 , 2As shown, this embodiment provides a plastic shell connection structure for connecting a first shell 1 and a second shell 2, comprising a main body welding rib portion 10 arranged along the edge of the first shell 1 on the outside of the first shell 1 and a main body welding groove portion 20 arranged along the edge of the second shell 2 on the outside of the second shell 2, wherein:

[0042] The main body welding rib portion 10 includes a first bottom plate 11 vertically extending outward from the surface of the first shell 1 and a first rib plate 12 connected to the first bottom plate 11 on a side facing the main body welding groove portion 20;

[0043] The main welding groove portion 20 includes a second bottom plate 21 extending vertically outward from the surface of the second shell 2 and a first groove plate 22 connected to the second bottom plate 21 on the side facing the first bottom plate 11, and a welding groove for the first rib plate 12 to be inserted is formed between the first groove plate 22, the second bottom plate 21 and the second shell 2;

[0044] A second slot plate 13 and a third slot plate 23 are respectively provided on the opposite sides of the first bottom plate 11 and the second bottom plate 21. A movable mold fixing groove 14 for clamping a movable mold of a welding device is formed between the second slot plate 13, the first bottom plate 11 and the first housing 1. A fixed mold fixing groove 24 for clamping a fixed mold of a welding device is formed between the third slot plate 23, the second bottom plate 21 and the second housing 2.

[0045] The main body welding rib portion 10 and the main body welding groove portion 20 are both made of thermoplastic plastic material, and the first rib plate 12 and the second bottom plate 21 are connected by friction welding;

[0046] After welding, the edge of the first shell 1 and the edge of the second shell 2 are tightly fitted.

[0047] Specifically, when the housing is closed, the main body welding rib 10 surrounds the edge of the first housing 1 and is connected end to end; the main body welding groove 20 surrounds the edge of the second housing 2 and is connected end to end. In this embodiment, the main body welding rib 10 is integrally formed with the first housing 1, and the main body welding groove 20 is integrally formed with the second housing 2.

[0048] In the main welding rib part 10, the first rib plate 12 is arranged at the middle of the first bottom plate 11 and is perpendicular to the first bottom plate 11, and the two are connected in a T shape. The second groove plate 13 is arranged at the end of the first bottom plate 11 and is perpendicular to the first bottom plate 11, and the two are connected in an L shape.

[0049] In the main welding groove portion 20, the first groove plate 22 and the third groove plate 23 are correspondingly arranged on both sides of the end of the second bottom plate 21, and are both perpendicular to the second bottom plate 21. The first groove plate 22, the third groove plate 23 and the second bottom plate 21 are connected to the side wall of the second shell 2 in an H shape.

[0050] Preferably, the groove width D of the movable mold fixing groove 14 and the fixed mold fixing groove 24 is 1 , D2 Both are 4.0mm to 6.0mm, which can avoid the slot width being too small to be difficult to fix on the welding equipment, and also avoid the slot width being too large to cause a significant increase in the overall volume and weight.

[0051] There are many friction motion modes in the friction welding process. During processing, the appropriate friction motion mode can be selected according to the shell shape and the connection part. Further, for the case where the movable mold of the welding equipment performs friction welding in a horizontal (perpendicular to the direction of the first groove plate 22) reciprocating motion mode, such as Figure 3 As shown, a plurality of reinforcing ribs 25 perpendicular to the first slot plate 22 are provided at the bottom of the welding groove, the two ends of the reinforcing ribs 25 are respectively connected to the first slot plate 22 and the second shell 2, and the bottom of the reinforcing ribs 25 is connected to the second bottom plate 21. The plurality of reinforcing ribs 25 are evenly arranged along the length direction of the welding groove, which can further improve the strength of the welding point and compensate for the influence on the welding strength caused by the lateral reciprocating motion of the main body welding rib part 10 sweeping the solder to both sides.

[0052] Preferably, the width W of a single reinforcing rib 25 is 1 The length is 1mm to 2mm, the length is consistent with the width of the welding groove, and the height H 1 The spacing distance D between two adjacent reinforcing ribs 25 is 0.5 mm to 1 mm. 3 The thickness is 2 mm to 3 mm, which ensures the strength of the welding position and minimizes the impact on the connection stability between the fixed mold and the fixed mold fixing groove 24.

[0053] Further, such as Figure 1 , 2 As shown, the thickness H of the first rib plate 12 is 2 The thickness is 1 mm to 3 mm, which can ensure the welding strength and avoid the problem of excessive solder overflow due to the first rib 12 being too thick.

[0054] Furthermore, the length L of the first rib plate 12 before welding is 1 Greater than the depth H of the welding groove 3 . The length of the first rib plate 12 before welding is L 1 The distance D between the first bottom plate 11 and the second bottom plate 21 after welding (i.e. when the edge of the first shell 1 and the edge of the second shell 2 are attached) is 4 The difference is 1 mm to 2 mm, which means that the first rib plate 12 has an interference margin of 1 mm to 2 mm to ensure welding strength, while avoiding the problem of excessive interference margin leading to long welding time and excessive solder overflow.

[0055] Preferably, the thickness H of the second bottom plate 21 before welding is 4 The thickness is 1.5 mm to 3.0 mm, which is larger than the interference fit to prevent the second bottom plate 21 from being welded through.

[0056] Furthermore, when the edge of the first shell 1 is attached to the edge of the second shell 2, a gap D of 0.5 mm to 2 mm is left between the first groove plate 22 and the first bottom plate 11. 5 , which facilitates the overflow of molten material and avoids clogging in the welding channel, affecting the welding effect and product performance.

[0057] When assembling the first shell 1 and the second shell 2, firstly, the main body welding rib portion 10 and the main body welding groove portion 20 are fixed on the welding equipment through the movable mold fixing groove 14 and the fixed mold fixing groove 24 respectively, so that the end of the first rib plate 12 is against the surface of the second bottom plate 21 in the welding groove, and then the main body welding rib portion 10 is driven by the movable mold to reciprocate in the direction parallel to the edge of the shell, and at the same time, force is applied to press the first rib plate 12 against the second bottom plate 21, so that the contact surfaces of the two generate heat by friction, and then melt under the heat until the edges of the first shell 1 and the second shell 2 are attached.

[0058] Example 2

[0059] This embodiment provides a plastic shell connection structure. For the convenience of expression, the same symbols are given to the same structures in Embodiment 2 as in Embodiment 1, and the same descriptions are omitted.

[0060] In Example 1, when the shell is closed, the main body welding rib portion 10 surrounds the edge of the first shell 1 and is connected end to end; the main body welding groove portion 20 surrounds the edge of the second shell 2 and is connected end to end.

[0061] In this embodiment, the housing formed by combining the first housing 1 and the second housing 2 is a non-enclosed structure. Figure 4 As shown, one side of the shell has an opening 3, in other words, the main body welding rib portion 10 / main body welding groove portion 20 is not connected end to end to surround the shell, but is disconnected near the opening 3. At this time, on the basis of the plastic shell connection structure in Example 1, in order to ensure the waterproof and dustproof effect of the shell, both ends of the main body welding rib portion 10 are provided with terminal welding rib portions 30 connected to the main body welding rib portion 10, and both ends of the main body welding groove portion 20 are provided with terminal welding groove portions 40 connected to the main body welding groove portion 20.

[0062] like Figure 4 , 5 As shown, the terminal welding rib portion 30 includes a third bottom plate 31 extending vertically outward from the surface of the first shell 1 and a second rib plate 32 connected to the third bottom plate 31 on the side facing the terminal welding groove portion 40. The terminal welding groove portion 40 includes a fourth bottom plate 41 extending vertically outward from the surface of the second shell 2 and a fourth groove plate 42 connected to the fourth bottom plate 41 on the side facing the third bottom plate 31, and a welding groove is formed between the fourth groove plate 42, the fourth bottom plate 41 and the second shell 2 for the second rib plate 32 to be inserted.

[0063] The third bottom plate 31 is connected to the first bottom plate 11, the fourth bottom plate 41 is connected to the second bottom plate 21, the second rib plate 32 is connected to the first rib plate 12, and the fourth slot plate 42 is connected to the first slot plate 22. The terminal welding rib portion 30 and the terminal welding slot portion 40 are also made of thermoplastic plastic material, and the second rib plate 32 is connected to the fourth bottom plate 41 by friction welding. After welding and fixing, the edge of the first shell 1 is completely fitted with the edge of the second shell 2, and the fourth slot plate 42 is also closely attached to the third bottom plate 31.

[0064] Furthermore, the plastic shell connection structure of this embodiment also includes a waterproof baffle 50 connected to the outside of the terminal welding rib part 30 or the terminal welding groove part 40. The cross section of the waterproof baffle 50 is an inverted L-shaped, which can cover the connection between the terminal welding rib part 30 and the terminal welding groove part 40, block the inflow of liquid, further improve the waterproof and dustproof effect of the shell near the opening 3, and improve the protection performance. Specifically, if the first shell 1 is located above the second shell 2 when the product is working, the waterproof baffle 50 is arranged on the end of the third bottom plate 31 of the terminal welding rib part 30 away from the first shell 1; if the second shell 2 is located above the first shell 1, the waterproof baffle 50 is arranged on the end of the fourth bottom plate 41 of the terminal welding groove part 40 away from the second shell 2, so that the liquid can flow downward along the outer surface of the waterproof baffle 50, and prevent the liquid from flowing into the fourth groove plate 42 and the third bottom plate 31. Therefore, the waterproof baffle 50 can improve the protection effect of the open shell. In addition, the waterproof baffle 50 can also be used on the main welding rib portion 10 or the main welding groove portion 20 on the closed shell or the open shell as a third line of protection to cover the connection between the main welding rib portion 10 and the main welding groove portion 20 to further enhance the waterproof effect.

[0065] Furthermore, the tail end of the waterproof baffle 50 is provided with an end baffle 51 bent toward the first shell 1 and the second shell 2. The end baffle 51 is parallel to the end face of the end welding rib portion 30 / end welding groove portion 40, and can shield the end face to prevent liquid from flowing into the welding groove.

[0066] In summary, the plastic shell connection structure of the utility model is sealed by friction welding, which can meet the IP67 waterproof and dustproof requirements. Compared with the traditional bolt and buckle reinforcement method, it has the advantages of light weight and small size, which can reduce material cost and transportation cost. The overall structure is simple and easy to assemble, which can reduce time cost and improve production line capacity.

[0067] The above implementation modes are preferred examples of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A plastic shell connection structure, used to connect a first shell and a second shell, characterized in that: It includes a main body welding rib portion arranged on the outside of the first shell along the edge of the first shell and a main body welding groove portion arranged on the outside of the second shell along the edge of the second shell, wherein: The main body welding rib portion includes a first bottom plate extending vertically outward from the first shell surface and a first rib plate connected to the first bottom plate on one side facing the main body welding groove portion; The main body welding groove portion includes a second bottom plate extending vertically outward from the surface of the second shell and a first groove plate connected to the second bottom plate on the side facing the first bottom plate, and a welding groove for inserting the first rib plate is formed between the first groove plate, the second bottom plate and the second shell; A second slot plate and a third slot plate are respectively provided on opposite sides of the first bottom plate and the second bottom plate, a movable mold fixing slot for a movable mold of a welding device to be clamped is formed between the second slot plate, the first bottom plate and the first shell, and a fixed mold fixing slot for a fixed mold of a welding device to be clamped is formed between the third slot plate, the second bottom plate and the second shell; The main body welding rib part and the main body welding groove part are both made of thermoplastic plastic material, and the first rib plate and the second bottom plate are connected by friction welding; After welding, the edge of the first shell is tightly fitted with the edge of the second shell.

2. The plastic shell connection structure according to claim 1, characterized in that: The groove widths D1 and D2 of the movable mold fixing groove and the fixed mold fixing groove are both 4.0 mm to 6.0 mm.

3. The plastic shell connection structure according to claim 1, characterized in that: The movable mold of the welding device performs friction welding in a reciprocating manner perpendicular to the direction of the first slot plate. A plurality of reinforcing welding ribs perpendicular to the first groove plate are arranged at the bottom of the welding groove, and the plurality of reinforcing welding ribs are evenly arranged along the length direction of the welding groove.

4. The plastic housing connection structure according to claim 3, characterized in that: The width W1 of a single reinforcing weld rib is 1 mm to 2 mm, the length is consistent with the width of the welding groove, the height H1 is 0.5 mm to 1 mm, and the spacing D3 between two adjacent reinforcing weld ribs is 2 mm to 3 mm.

5. The plastic shell connection structure according to claim 1, characterized in that: The thickness H2 of the first rib is 1 mm to 3 mm.

6. The plastic shell connection structure according to claim 1, characterized in that: The length L1 of the first rib before welding is greater than the depth H3 of the welding groove, the thickness H4 of the second bottom plate before welding is 1.5mm~3.0mm, and the difference between the length L1 of the first rib before welding and the distance D4 between the first bottom plate and the second bottom plate after welding is 1mm~2mm.

7. The plastic shell connection structure according to claim 6, characterized in that: When the edge of the first shell body is attached to the edge of the second shell body, a gap D5 of 0.5 mm to 2 mm is left between the first groove plate and the first bottom plate.

8. The plastic shell connection structure according to claim 1, characterized in that: The housing formed by combining the first housing and the second housing has an open opening; Both ends of the main body welding rib portion are provided with terminal welding rib portions connected with the main body welding rib portion, and both ends of the main body welding groove portion are provided with terminal welding groove portions connected with the main body welding groove portion, the terminal welding rib portion includes a third bottom plate extending vertically outward from the first shell surface and a second rib plate connected to the third bottom plate on one side of the terminal welding groove portion, and the terminal welding groove portion includes a fourth bottom plate extending vertically outward from the second shell surface and a fourth groove plate connected to the fourth bottom plate on one side of the third bottom plate, and a welding groove for inserting the second rib plate is formed between the fourth groove plate, the fourth bottom plate and the second shell; The end welding rib portion and the end welding groove portion are made of thermoplastic plastic material. The second rib plate and the fourth bottom plate are connected by friction welding. After welding and fixing, the edge of the first shell body and the edge of the second shell body are tightly fitted, and the fourth groove plate and the third bottom plate are also tightly fitted to each other.

9. The plastic shell connection structure according to claim 8, characterized in that: Also includes: A waterproof baffle connected to the outer side of the terminal welding rib portion or the terminal welding groove portion, The cross section of the waterproof baffle is in an inverted L shape, and is used to cover the connection between the terminal welding rib part and the terminal welding groove part. If the first shell is located above the second shell when the product is working, the waterproof baffle is arranged on an end of the third bottom plate away from the first shell; if the second shell is located above the first shell, the waterproof baffle is arranged on an end of the fourth bottom plate away from the second shell.

10. The plastic shell connection structure according to claim 9, characterized in that: The tail end of the waterproof baffle is provided with an end baffle bent toward the first shell and the second shell, and the end baffle is parallel to the end face of the end welding rib part / end welding groove part, and is used to shield the end face.

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