Kidney-shaped hole structure

Abstract

The utility model relates to the technical field of screw connection, and discloses a kidney-shaped hole structure which is used in a molded part formed by injection molding, the molded part is formed by injection molding through an injection molding cavity between an upper mold and a lower mold which are opened up and down, and a main connecting column and an auxiliary connecting column are arranged on the molded part. Screw connecting structures are machined on the connecting main column and the connecting auxiliary column, the screw assembling axes of the connecting main column and the connecting auxiliary column are arranged in an acute angle mode on a forming part, the mold opening direction of a mold is the same as that of the connecting main column, and a mold opening side edge inclined relative to the screw assembling axis direction is designed on the connecting auxiliary column. An assembling groove for assembling a screw is formed between the mold opening side edge and the connecting auxiliary column, the connecting shape of the assembling groove and the surface of the forming piece is a kidney-shaped hole, the mold opening side edge is parallel to the mold opening direction or inclines towards the outer side, and the situation that the appearance design and the internal structure of a product are possibly changed due to the fact that the mold stripping direction is changed is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of screw connection, and particularly relates to a kidney-shaped hole structure. Background Art

[0002] Injection molds generally need to be provided with a certain draft angle. The draft angle is a specially designed inclination angle in injection molding to facilitate the separation of plastic parts from the mold. It usually appears on the side walls or protrusions of plastic parts. By reducing the contact area between the plastic part and the mold surface, the adsorption force between them is reduced, making it easier for the plastic part to be demolded. The draft angle can ensure that the injection-molded part can be smoothly removed from the mold cavity when the mold is opened. If there is not enough draft angle, the injection-molded part may be closely attached to the surface of the mold cavity, resulting in difficult demolding and even damage to the mold or the injection-molded part. When the injection-molded part is closely attached to the mold surface, a large frictional force may be generated during demolding. This frictional force may cause scratches, wear, or even damage to the mold surface. Setting the draft angle can reduce the frictional force during demolding, thereby protecting the mold.

[0003] In the field of mechanical manufacturing technology, screw connection is a common fixing method and is widely used in the assembly of various products. The stability of screw connection directly affects the performance and service life of products. However, in actual operation, due to the possible inconsistency between the mold opening direction and the screw fixing direction, the shape and position of the screw hole do not match the expectation, thus affecting the fixing effect of the screw. In addition, the product design is also restricted by the mold ejection direction, which may affect the screw fixing direction and further affect the screw fixing effect. To solve this problem, there are mainly two existing solutions in the prior art. One is to add a washer to the screw to compensate for the gap caused by the mold opening direction of the screw hole, making the structure more stable. The other is to change the mold opening direction so that the mold opening direction is consistent with the screw fixing direction, but an internal slider structure is required. Although the prior art has provided some solutions, there are still some problems and disadvantages. For example, the method of adding a washer to the screw can solve some problems, but it cannot completely eliminate the gap caused by the inconsistency between the mold opening direction and the screw fixing direction, which may lead to unstable screw fixing. The method of changing the mold opening direction can make the mold opening direction consistent with the screw fixing direction, but it requires an internal slider structure, which increases the manufacturing complexity and cost. In addition, both of these methods may affect the appearance design and internal structure of the product, which is not conducive to the overall design and optimization of the product. Summary of the Utility Model

[0004] 1. Technical problem to be solved: In view of the deficiencies of the prior art, the present utility model provides a kidney-shaped hole structure, which has the advantages of not requiring a change in the mold opening direction, avoiding possible changes in the product appearance design and internal structure caused by changing the mold opening direction, and solving the problem that the shape and position of the screw hole do not conform to the expectation due to the inconsistency between the mold opening direction and the screw fixing direction.

[0005] 2. Technical solution: To achieve the above object of not requiring a change in the mold opening direction and avoiding possible changes in the product appearance design and internal structure caused by changing the mold opening direction, the present utility model provides the following technical solution: A kidney-shaped hole structure is used in a molded part formed by injection molding. The molded part is injection-molded through an injection cavity between an upper mold and a lower mold that are opened up and down. The molded part is provided with a connecting main column and a connecting auxiliary column. The connecting main column and the connecting auxiliary column are processed with a screw connection structure. The screw assembly axes of the connecting main column and the connecting auxiliary column are arranged at an acute angle on the molded part. The mold opening direction is the same as that of the connecting main column. The connecting auxiliary column is designed with a mold opening side inclined in the direction of the screw assembly axis. An assembly groove for assembling a screw is formed between the mold opening side and the connecting auxiliary column. The connection shape between the assembly groove and the surface of the molded part is a kidney-shaped hole. The mold opening side is parallel to the mold opening direction or forms a mold opening inclination angle with the mold opening direction. When the mold opening side is parallel to the mold opening direction, the upper mold can be pulled out tangentially relative to the mold opening side. When the root of the mold opening side inclines outward, the mold opening side and the upper mold can form a mold opening inclination angle, which is more convenient for mold opening.

[0006] Preferably, the PCB board is fixed below the molded part through the assembly groove and the screw.

[0007] Preferably, the width of the kidney-shaped hole and the assembly groove is smaller than the diameter of the screw, and the screw is screwed into the assembly groove to machine threads on its inner wall.

[0008] Preferably, an assembly block with a threaded hole can be arranged in the assembly groove. After the assembly block is placed in the assembly groove, the PCB board is fixed below the molded part through the screw.

[0009] Preferably, a threaded hole is provided above the connecting main column for connecting the molded part and the PCB board with other parts.

[0010] Preferably, the assembly groove is in a funnel shape, with an upper mouth diameter of 5 mm, a lower mouth diameter of 3 mm, and a depth of 10 mm.

[0011] Preferably, a standard metal washer with a thickness of 1 mm, an inner diameter of 5 mm, and an outer diameter of 7 mm is provided between the screw and the lower mold.

[0012] Preferably, a triangular screw washer can be arranged between the screw and the lower mold.

[0013] Preferably, the formed part is in the shape of an oval ring, and at least two connecting main columns and connecting sub-columns are provided on the surface of the formed part. The extending directions of the connecting main columns are the same, and the tilting directions of the mold-opening sides of the connecting sub-columns are consistent.

[0014] Preferably, the lower part of the formed part is in a groove shape, and the PCB board is arranged in the groove.

[0015] (III) Beneficial effects: Compared with the prior art, the present utility model provides a kidney-shaped hole structure, which has the following beneficial effects:

[0016] 1. For this kidney-shaped hole structure, since the fixing direction of the screw is inconsistent with the mold-opening direction, the traditional cylindrical screw fixing structure will interfere with the mold during demolding, resulting in difficult demolding. The design of the mold-opening side cleverly changes the assembly groove for fixing the screw into a funnel shape, and one side thereof is provided with an inclined surface having the same inclination as the demolding inclination. During demolding, the mold-opening side is parallel to the mold-opening direction or inclined outward, so that when only the upper mold and the lower mold are used for injection molding, the upper mold opens the mold along the extending direction of the connecting main column, and will not be blocked due to the different extending directions of the connecting sub-columns, and there is no need to change the demolding direction, avoiding the possible changes in the product appearance design and internal structure caused by changing the demolding direction, which is beneficial to the overall design and optimization of the product, and simplifies the mold. Ordinary upper and lower molds can be used for mold clamping and injection molding to complete injection molding, reducing costs. And the simple mold is less damaged during frequent mold opening. During the production process, it can effectively reduce costs, increase processing efficiency, and through this design method of the connecting column, there is no need to add a washer to the screw for the screw hole, avoiding the possible increase in manufacturing costs and the reduction in production efficiency caused by adding a washer, and at the same time avoiding the possible reduction in the screw fixing effect caused by adding a washer. There is no need for an internal slider structure, which simplifies the manufacturing process, reduces the manufacturing complexity and costs, and improves production efficiency.

[0017] 2. For this kidney-shaped hole structure, the design of the screw hole of the present invention enables the nut of the screw to fit the part, without an inclination angle, avoiding the problems of unstable fixation or damage to other components caused by the non-perpendicularity of the screw fixing direction and the part to be fixed, improving the stability and reliability of the screw fixing. A triangular screw washer can be arranged between the screw and the lower mold. Through its unique triangular structure, the triangular screw washer can fill and disperse the pressure between the screw and the inclined hole, thereby making up for the gap and improving the fixing stability. This kidney-shaped hole structure can be used on injection molded parts that require the above connection, such as the lamp housing of a vehicle lamp, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a top view of the structure of the present utility model;

[0019] Figure 2 Schematic diagram of the details of the connecting column of the present utility model;

[0020] Figure 3 Schematic diagram of the mold opening of the molded part of the present utility model;

[0021] Figure 4 Schematic diagram of the included angle of the axis of the connecting column of the present utility model;

[0022] Figure 5 Schematic diagram of the section of the molded part of the present utility model;

[0023] Figure 6 Schematic diagram of the bottom of the molded part of the present utility model.

[0024] In the figure: 1, molded part; 2, PCB board; 10, mold opening side; 11, connecting sub-column; 12, connecting main column; 100, assembly groove; 101, upper mold; 102, lower mold; 103, screw; 1001, waist-shaped hole. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0026] Please refer to Figures 1 - 3 , a waist-shaped hole structure, which is used in the molded part 1 of injection molding. In this embodiment, the molded part 1 is a lamp housing structure for connecting a vehicle lamp. The molded part 1 is injection-molded through the injection cavity between the upper mold 101 and the lower mold 102 with upper and lower mold openings. The molded part 1 is provided with a connecting main column 12 and a connecting sub-column 11. A screw connection structure is processed on the connecting main column 12 and the connecting sub-column 11. Refer to Figure 4 , the screw assembly axes of the connecting main column 12 and the connecting sub-column 11 are arranged at an acute angle on the molded part 1. The mold opening direction is the same as that of the connecting main column 12. The connecting sub-column 11 is designed with a mold opening side 10 inclined in the direction of the screw assembly axis. As Figure 4 , Figure 5 shown, an assembly groove 100 for assembling screws is formed between the mold opening side 10 and the connecting sub-column 11; as Figure 6 shown, the connection shape between the assembly groove 100 and the surface of the molded part 1 is a waist-shaped hole 1001. During the injection molding process of the molded part 1 in this embodiment, as Figure 3As shown, the mold opening side 10 is parallel to the mold opening direction or inclined outward, so that the inner wall of the mold will not collide with the connecting sub-column 11 of the molded part 1 during the mold opening process of the upper mold 101.

[0027] See also Figures 5 - 6 The molded part 1 is in the shape of an elliptical ring. At least two connecting main columns 12 and connecting sub-columns 11 are provided on the surface of the molded part 1. The connecting main columns 12 extend in the same direction. The mold opening sides 10 of the connecting sub-columns 11 are inclined in the same direction. The bottom of the molded part 1 is in the shape of a groove. The PCB board 2 is arranged in the groove. The molded part 1 fixes the PCB board 2 under the molded part 1 through the assembly groove 100 and the screw 103. The assembly groove 100 is funnel-shaped, with an upper diameter of 5mm, a lower diameter of 3mm, and a depth of 10mm. The width of the waist-shaped hole 1001 and the assembly groove 100 is smaller than the diameter of the screw 103. The screw 103 is screwed into the assembly groove 100 to process a thread on its inner wall. A threaded hole is provided above the connecting main column 12 for connecting the molded part 1 and the PCB board 2 with other parts.

[0028] A standard metal washer with a thickness of 1 mm, an inner diameter of 5 mm, and an outer diameter of 7 mm is provided between the screw 103 and the lower mold 102, which can solve the existing solutions such as adding washers to the screws or changing the mold opening direction, which have certain problems and shortcomings, such as the inability to completely eliminate the gap caused by the inconsistency between the mold opening direction and the screw fixing direction, or the need to increase the complexity and cost of manufacturing, or the possible impact on the appearance design and internal structure of the product.

[0029] A triangular screw washer can be arranged between the screw 103 and the lower mold 102. The triangular screw washer can fill and disperse the pressure between the screw and the inclined hole through its unique triangular structure, thereby compensating for the gap and improving the stability of the fixation.

[0030] In other embodiments, an assembly block (not shown) with a threaded hole may be provided in the assembly slot 100 . After the assembly block is placed in the assembly slot 100 , the PCB board is fixed below the molded part 1 by screws 103 .

[0031] Working principle: Injection molds generally need to be set with a certain draft angle. The draft angle is a deliberately designed inclination angle in injection molding to facilitate the removal of plastic parts from the mold. It usually appears on the side walls or protrusions of plastic parts. By reducing the contact area between the plastic part and the mold surface, the adsorption force between them is reduced, making it easier for the plastic part to be demolded. The draft angle can ensure that the injection-molded part can be smoothly removed from the mold cavity when the mold is opened. If there is not enough draft angle, the injection-molded part may closely adhere to the surface of the mold cavity, resulting in difficult demolding and even damage to the mold or the injection-molded part. When the injection-molded part is closely adhered to the mold surface, a large frictional force may be generated during demolding. This frictional force may cause scratches, wear, or even damage to the mold surface. Setting the draft angle can reduce the frictional force during demolding, thereby protecting the mold. The molded part 1 formed between the upper mold 101 and the lower mold 102 will also be set at a certain angle according to the mold opening direction. When the molded part 1 is used as a connecting part, connecting columns for machining threaded holes will be provided on its surface. When the fixing direction of the screw in the connecting column is inconsistent with the mold opening direction, multiple molds need to be set for mold opening, not simply the upper and lower molds, which increases the cost and damage during the mold opening process. By using the connecting column with the same mold opening direction and screw fixing direction as the main connecting column 12, and the connecting column with the inconsistent screw fixing direction and mold opening direction as the auxiliary connecting column 11, an opening side 10 inclined relative to the screw assembly axis direction is designed on the auxiliary connecting column 11. An assembly groove 100 for assembling the screw is formed between the opening side 10 and the auxiliary connecting column 11. The connection shape between the assembly groove 100 and the surface of the molded part 1 is a waist-shaped hole 1001. The opening side 10 is parallel to the mold opening direction or inclined outward, so that when only the upper mold 101 and the lower mold 102 are used for injection molding, refer to Figure 3 , the upper mold 101 is opened along the extension direction of the main connecting column 12 and will not be blocked due to the different extension directions of the auxiliary connecting columns 11, and injection molding can be achieved through the upper and lower molds.

[0032] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0033] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A kidney-shaped hole structure is used in a molded part (1) formed by injection molding. The molded part (1) is injection-molded through an injection cavity between an upper mold (101) and a lower mold (102) that are opened and closed vertically. The molded part (1) is provided with a connecting main column (12) and a connecting auxiliary column (11). A screw connection structure is processed on the connecting main column (12) and the connecting auxiliary column (11). The screw assembly axes of the connecting main column (12) and the connecting auxiliary column (11) are arranged at an acute angle on the molded part (1). It is characterized in that: The mold opening direction is the same as that of the connecting main column (12). An opening side (10) inclined in the direction of the screw assembly axis is designed on the connecting auxiliary column (11). An assembly groove (100) for assembling screws is formed between the opening side (10) and the connecting auxiliary column (11). The connection shape between the assembly groove (100) and the surface of the molded part (1) is a kidney-shaped hole (1001). The opening side (10) is parallel to the mold opening direction or the opening side (10) forms an opening inclination angle with the mold opening direction.

2. The kidney-shaped hole structure according to claim 1, characterized in that: The molded part (1) fixes the PCB board (2) below the molded part (1) through the assembly groove (100) and the screw (103).

3. The kidney-shaped hole structure according to claim 2, wherein: The width of the kidney-shaped hole (1001) and the assembly groove (100) is smaller than the diameter of the screw (103). The screw (103) is screwed into the assembly groove (100) to machine threads on its inner wall.

4. A kidney-shaped hole structure according to claim 2, characterized in that: An assembly block with a threaded hole can be arranged in the assembly groove (100). After the assembly block is placed in the assembly groove (100), the PCB board is fixed below the molded part (1) through the screw (103).

5. The kidney-shaped hole structure according to claim 2, characterized in that: A threaded hole is provided above the connecting main column (12) for connecting the molded part (1) and the PCB board (2) to other parts.

6. A kidney-shaped hole structure according to claim 1, characterized in that: The assembly groove (100) is in a funnel shape, with an upper mouth diameter of 5 mm, a lower mouth diameter of 3 mm, and a depth of 10 mm.

7. A kidney-shaped hole structure according to claim 2, characterized in that: The molded part (1) is in an oval ring shape. At least two connecting main columns (12) and connecting auxiliary columns (11) are provided on the surface of the molded part (1). The extending directions of the connecting main columns (12) are the same, and the inclination directions of the opening sides (10) of the connecting auxiliary columns (11) are the same.

Images