A smart watch plastic shell structure and its injection molding process

Abstract

The present invention belongs to the field of plastic processing technology, and in particular to a smart watch plastic shell structure and its injection molding process. The following scheme is proposed, which specifically includes an outer shell, a light guide column, a sports intelligence module, an optical sensor and a heart rate monitoring sensor. The outer shell is divided into an outer shell frame and a shell bracket, and the outer shell frame is clamped on the outer side of the shell bracket. The light guide column is installed on the side of the outer shell. The sports intelligence module is fixedly installed on the outer shell frame. Plastic-coated brackets are installed on both sides of the top of the shell bracket. In the present invention, an outer shell frame is formed on the outer side of the shell bracket, and the sports intelligence module is plastic-coated in a rectangular frame inserted into the interior of the shell bracket. At the same time, a plastic-coated bracket is formed between the shell bracket and the heart rate monitoring sensor, so that a plastic-coated structure is formed between the sports intelligence module, the heart rate monitoring sensor and the plastic shell of the watch, effectively preventing the sports intelligence module and the heart rate monitoring sensor from falling off.

Description

Technical Field

[0001] The present invention relates to the field of plastic processing technology, and in particular to a smart watch plastic shell structure and an injection molding process thereof. Background Art

[0002] A smartwatch is a wearable device that combines the functions of a smartphone and a wristwatch. It has core functions such as positioning and anti-loss, audio and video calls, as well as electronic payment, health monitoring, social chat, photography, intelligent object recognition and other functions.

[0003] The shell of a smart watch is mainly made by injection molding. Some functional components need to be implanted during the production of the plastic shell, such as a heart rate monitoring sensor (ECG) for monitoring cardiac electrical activity to help users understand their heart health status, an optical sensor (IML) that captures and analyzes the user's motion patterns and collects motion data without interfering with the user, and a motion intelligence module (MIM) that focuses on improving the accuracy and personalized experience of motion tracking and optimizing the bracelet's response and processing capabilities to user motion. The traditional smart watch plastic shell is an integral structure, and the plastic shell is processed in two injection moldings. In one injection molding, the heart rate monitoring sensor (ECG), motion intelligence module (MIM) and light guide are simultaneously implanted into the mold for injection molding. Plastic, the plastic shell is formed in one shot, and the optical sensor (IML) is implanted into the surface of the plastic shell in two shots. The heart rate monitoring sensor (ECG) and the sports intelligent module (MIM) are implanted on the plastic shell to form a partial back cover structure, resulting in a cavity under the heart rate monitoring sensor (ECG) and the sports intelligent module (MIM). The bonding stability between the heart rate monitoring sensor (ECG) and the sports intelligent module (MIM) and the plastic shell is poor, and the cavity also leads to poor pressure bearing effect of the heart rate monitoring sensor (ECG) and the sports intelligent module (MIM). The front and rear mold cores of the two-shot mold are directly pressed together with the heart rate monitoring sensor (ECG) and the sports intelligent module (MIM), which makes the surface of the heart rate monitoring sensor (ECG) and the sports intelligent module (MIM) easily crushed, affecting the yield rate of the plastic shell.

[0004] In response to the above technical bottlenecks, the present invention proposes a smart watch plastic shell structure and its injection molding process. Through innovative plastic shell improvements, it effectively solves the problem that the ECG and MIM surfaces are easily crushed and affect the pass rate. Summary of the Invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a smart watch plastic shell structure and an injection molding process thereof.

[0006] The present invention proposes a plastic shell structure for a smart watch, including an outer shell, a light guide, a sports intelligence module, an optical sensor and a heart rate monitoring sensor. The outer shell is divided into a shell frame and a shell bracket, and the shell frame is clamped to the outer side of the shell bracket, the light guide is installed on the side of the outer shell, the sports intelligence module is fixedly installed on the shell frame, and plastic-coated brackets are installed on both sides of the top of the shell bracket. A metal connector is welded to the bottom of the heart rate monitoring sensor, and the bottom of the metal connector is fixedly connected to the plastic-coated bracket.

[0007] In the present invention, preferably, the interior of the shell frame is provided with a rectangular frame and a button guide groove inserted into the interior of the shell bracket, and the motion intelligence module is molded inside the rectangular frame, the outside of the shell frame is provided with a button mounting groove connected to the button guide groove, and the side of the shell frame is provided with an outer notch connected to the light guide column.

[0008] In the present invention, preferably, one end of the housing bracket is provided with a plastic-wrapped frame that matches the rectangular frame, and the side surface of the housing bracket is provided with an inner notch that matches the light guide column.

[0009] In the present invention, preferably, bracket portions cooperating with the overmolded bracket are provided on both sides of the top of the housing bracket, and a three-shot mold groove adapted to the optical sensor is provided in the center of the top of the housing bracket.

[0010] In the present invention, preferably, an adhesive plastic part is provided between the optical sensor and the three-shot mold groove, and a through groove arranged in a "mesh" shape is provided in the middle of the adhesive plastic part.

[0011] Preferably in the present invention, an electrical connection pin is provided at the bottom of the heart rate monitoring sensor, and the electrical connection pin passes through the plastic-coated bracket and is provided at an internal position of the shell bracket.

[0012] Preferably in the present invention, the metal connecting parts include a first hardware part and a third hardware part welded to the two ends of the bottom of the heart rate monitoring sensor, and a second hardware part welded to the middle position of the bottom of the heart rate monitoring sensor. The bottom positions of the first hardware part, the second hardware part and the third hardware part are all provided with claws embedded in the inside of the plastic-coated bracket.

[0013] In the present invention, preferably, the surface of the plastic-coated bracket is sequentially provided with a first embedding groove, a second embedding groove and a third embedding groove, and the bottoms of the first embedding groove, the second embedding groove and the third embedding groove are all provided with extension grooves.

[0014] In the present invention, preferably, a support portion extending downward is provided at the bottom of the overmolded bracket, and a boss portion engaged with the support portion is provided at the bottom of the shell bracket.

[0015] In the present invention, preferably, a wedge-shaped groove penetrating the second embedding groove is provided between the support portion and the boss portion, and the second hardware is provided with an extension portion extending into the support portion.

[0016] An injection molding process for a smart watch plastic shell structure includes the following steps:

[0017] Step 1: The light guide column is implanted into a one-shot molding mold and the housing bracket is made by one-shot injection molding.

[0018] Step 2: Assemble the sports smart module, heart rate monitoring sensor and shell bracket together in the secondary molding mold. Through two-shot injection molding, form a shell frame on the outside of the shell bracket. Overmold the sports smart module in a rectangular frame inserted into the shell bracket. At the same time, form an overmolded bracket between the shell bracket and the heart rate monitoring sensor, so that an overmolded structure is formed between the sports smart module, the heart rate monitoring sensor and the plastic shell of the watch.

[0019] Step 3: Install the optical sensor and the secondary molded outer shell together in the tertiary molding mold. At this time, the optical sensor is set in the middle position of the three-shot mold slot. Through the third injection molding, an adhesive plastic part that wraps the bottom surface of the optical sensor is formed in the gap between the optical sensor and the three-shot mold slot. The optical sensor is implanted into the secondary molded product. After the third injection molding is completed, the plastic shell with the sports intelligence module, optical sensor and heart rate monitoring sensor installed is formed.

[0020] Compared with the prior art, the present invention provides a smart watch plastic shell structure and its injection molding process, which has the following beneficial effects:

[0021] The original plastic watch case is divided into two parts: a case frame and a case bracket. The case bracket is made by one-shot injection molding, and a light guide is implanted on the case bracket. Next, the sports smart module, heart rate monitoring sensor, and case bracket are assembled together in a two-shot mold. Then, a case frame is formed on the outside of the case bracket by two-shot injection molding. The sports smart module is overmolded in a rectangular frame inserted into the inside of the case bracket. At the same time, an overmolded bracket is formed between the case bracket and the heart rate monitoring sensor. This forms an overmolded structure between the sports smart module, the heart rate monitoring sensor, and the plastic watch case, effectively preventing the sports smart module and the heart rate monitoring sensor from falling off.

[0022] By providing brackets on both sides of the housing bracket, multiple supporting ribs are formed below the heart rate monitor sensor, significantly enhancing the heart rate monitor sensor's resistance to pressure. Furthermore, when the overmolded bracket is formed between the housing bracket and the heart rate monitor sensor through two-shot injection molding, multiple raised portions are formed at the bottom of the overmolded bracket, which fit into the gaps in the bracket, significantly enhancing the firmness between the heart rate monitor sensor and the watch's plastic casing.

[0023] By arranging the first, second, and third hardware parts at the bottom of the heart rate monitor sensor, in the two-shot mold, the claw structures at the bottom of the first, second, and third hardware parts provide support for the bottom of the heart rate monitor sensor, effectively enhancing the stability of the heart rate monitor sensor installation. In addition, the metal connector and the overmolded bracket constitute an elastic protection structure in the three-shot mold, preventing the surface of the heart rate monitor sensor from being compressed and damaged in the three-shot mold.

[0024] After the shell bracket is formed, some notches are reserved in the boss part. When the heart rate monitoring sensor is implanted, the extended part of the second hardware is embedded in the boss part to form a limiting structure to avoid the second hardware from being offset during the second injection molding of the overmolded bracket. The overmolded bracket is entirely covered in the second hardware to form mutually meshing support parts and boss parts, further enhancing the stability of the installation of the heart rate monitoring sensor and improving the stability of the back cover structure of the plastic shell part that constitutes the heart rate monitoring sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a smart watch plastic shell proposed by the present invention;

[0026] Figure 2 A schematic diagram of the structure of a plastic shell of a smart watch in the background art;

[0027] Figure 3 This is a schematic diagram of the outer shell structure of a smart watch plastic shell structure proposed by the present invention;

[0028] Figure 4 This is a schematic diagram of the shell frame structure of a smart watch plastic shell structure proposed by the present invention;

[0029] Figure 5 This is a schematic diagram of the housing support structure of a smart watch plastic shell structure proposed by the present invention;

[0030] Figure 6 This is a schematic diagram of the metal connector structure of a smart watch plastic shell structure proposed by the present invention;

[0031] Figure 7 This is a schematic diagram of the support structure of a smart watch plastic shell structure proposed by the present invention;

[0032] Figure 8 This is a schematic diagram of the back structure of the housing bracket of a smart watch plastic shell structure proposed by the present invention;

[0033] Figure 9 This is a schematic diagram of the boss structure of a smart watch plastic shell structure proposed by the present invention;

[0034] Figure 10This is a schematic diagram of the electrical connection pin structure of a smart watch plastic shell structure proposed by the present invention.

[0035] In the figure: 1 outer shell, 11 outer shell frame, 111 rectangular frame, 112 button mounting groove, 113 button guide groove, 114 outer notch, 12 shell bracket, 121 plastic-coated frame, 122 bracket part, 123 three-shot mold groove, 124 inner notch, 125 boss part, 2 light guide column, 3 sports smart module, 4 optical sensor, 5 adhesive plastic part, 6 heart rate monitoring sensor, 61 electrical connection bolt, 7 metal connector, 71 first hardware part, 72 second hardware part, 73 third hardware part, 74 claw, 75 extension part, 8 plastic-coated bracket, 81 first embedded groove, 82 second embedded groove, 83 third embedded groove, 84 extension groove, 85 support part. DETAILED DESCRIPTION

[0036] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0037] Reference Figure 1 and Figure 3 A smart watch plastic shell structure includes an outer shell 1, a light guide column 2, a sports intelligence module 3, an optical sensor 4 and a heart rate monitoring sensor 6. The outer shell 1 is divided into an outer shell frame 11 and a shell bracket 12, and the outer shell frame 11 is clamped on the outer side of the shell bracket 12. The light guide column 2 is installed on the side of the outer shell 1. The sports intelligence module 3 is fixedly installed on the outer shell frame 11. Plastic-coated brackets 8 are installed on both sides of the top of the shell bracket 12. A metal connector 7 is welded to the bottom of the heart rate monitoring sensor 6, and the bottom of the metal connector 7 is fixedly connected to the plastic-coated bracket 8.

[0038] Reference Figure 1 、 Figure 3-Figure 4The interior of the shell frame 11 is provided with a rectangular frame 111 and a button guide groove 113 inserted into the interior of the shell bracket 12, and the sports intelligent module 3 is overmolded inside the rectangular frame 111. The outer side of the shell frame 11 is provided with a button installation groove 112 connected to the button guide groove 113, and the side of the shell frame 11 is provided with an outer notch 114 connected to the light guide column 2. In the present invention, the original watch plastic shell is divided into two parts: the shell frame 11 and the shell bracket 12. The shell bracket 12 is made by one-shot injection molding, and the light guide column 2 is implanted in the shell bracket 12. Secondly, the sports intelligence module 3, the heart rate monitoring sensor 6 and the shell bracket 12 are assembled together in a two-shot mold, and then a shell frame 11 is formed on the outside of the shell bracket 12 by two-shot injection molding. The sports intelligence module 3 is overmolded in a rectangular frame 111 inserted into the inside of the shell bracket 12, and a plastic-coated bracket 8 is formed between the shell bracket 12 and the heart rate monitoring sensor 6, so that a plastic-coated structure is formed between the sports intelligence module 3, the heart rate monitoring sensor 6 and the plastic shell of the watch, which effectively prevents the sports intelligence module 3 and the heart rate monitoring sensor 6 from falling off.

[0039] Reference Figure 1 、 Figure 3-Figure 5 One end of the shell bracket 12 is provided with a plastic-coated frame 121 that cooperates with the rectangular frame 111, and the side of the shell bracket 12 is provided with an inner notch 124 that cooperates with the light guide column 2. In the present invention, when the motion intelligence module 3 is implanted, the motion intelligence module 3 is arranged in the internal position of the plastic-coated frame 121. When the shell frame 11 is made by two-shot injection molding, the rectangular frame 111 fills the gap between the plastic-coated frame 121 and the periphery of the motion intelligence module 3 to form a plastic-coated structure, and then the motion intelligence module 3 is implanted between the shell frame 11 and the shell bracket 12, which significantly enhances the stability of the installation of the motion intelligence module 3.

[0040] Reference Figure 1 、 Figure 5 and Figure 8 , both sides of the top of the shell bracket 12 are provided with bracket parts 122 that cooperate with the overmolded bracket 8, and a three-shot mold groove 123 that is compatible with the optical sensor 4 is provided in the center of the top of the shell bracket 12. In the present invention, by providing the bracket parts 122 on both sides of the shell bracket 12, a plurality of supporting rib structures are formed below the heart rate monitoring sensor 6, which significantly enhances the pressure resistance of the heart rate monitoring sensor 6, and when the overmolded bracket 8 is formed between the shell bracket 12 and the heart rate monitoring sensor 6 by two-shot injection molding, a plurality of raised parts embedded in the gaps of the bracket parts 122 are formed at the bottom of the overmolded bracket 8, which significantly enhances the firmness between the heart rate monitoring sensor 6 and the plastic shell of the watch.

[0041] There is an adhesive plastic part 5 between the optical sensor 4 and the three-shot mold groove 123, and a through groove arranged in a "mu" shape is provided in the middle of the adhesive plastic part 5. In the present invention, after the housing bracket 12 is formed, a three-shot mold groove 123 is provided in the middle thereof, and the optical sensor 4 is arranged at the middle position of the three-shot mold groove 123. Through the third injection molding, an adhesive plastic part 5 that wraps the bottom surface of the optical sensor 4 is formed in the gap between the optical sensor 4 and the three-shot mold groove 123. The optical sensor 4 is implanted into the secondary forming product, and the third injection molding is completed, and the plastic shell finished product installed with the motion intelligent module 3, the optical sensor 4 and the heart rate monitoring sensor 6 is formed. At the same time, the wrapping behavior of the adhesive plastic part 5 enhances the stability of the installation of the optical sensor 4.

[0042] Refer to Figure 1 and Figure 10 , a power connection bolt 61 is provided at the bottom of the heart rate monitoring sensor 6, and the power connection bolt 61 passes through the plastic-coated bracket 8 and is arranged at the internal position of the housing bracket 12. In the present invention, the heart rate monitoring sensor 6 relies on the power connection bolt 61 at the bottom to achieve signal connection with the inside of the plastic shell. The bottom of the power connection bolt 61 is subjected to plastic encapsulation treatment with the two-shot mold. When the plastic-coated bracket 8 is two-shot formed, damage to the bottom interface of the power connection bolt 61 is avoided.

[0043] Refer to Figure 1 , Figure 6-Figure 8 , the metal connecting part 7 successively includes a first metal part 71 and a third metal part 73 welded to both ends of the bottom of the heart rate monitoring sensor 6, and a second metal part 72 welded to the middle position of the bottom of the heart rate monitoring sensor 6. Claw 74 embedded in the interior of the plastic-coated bracket 8 is provided at the bottom positions of the first metal part 71, the second metal part 72 and the third metal part 73. In the present invention, by providing the first metal part 71, the second metal part 72 and the third metal part 73 at the bottom of the heart rate monitoring sensor 6, in the two-shot mold, through the claw 74 structure at the bottom of the first metal part 71, the second metal part 72 and the third metal part 73, support is provided for the bottom of the heart rate monitoring sensor 6, effectively enhancing the stability of the installation of the heart rate monitoring sensor 6, and the metal connecting part 7 and the plastic-coated bracket 8 form an elastic protection structure in the three-shot mold, avoiding damage to the surface of the heart rate monitoring sensor 6 in the three-shot mold due to compression.

[0044] Refer to Figure 6-Figure 8 , the surface of the plastic-coated bracket 8 is successively provided with a first embedding groove 81, a second embedding groove 82 and a third embedding groove 83, and extension grooves 84 are provided at the bottoms of the first embedding groove 81, the second embedding groove 82 and the third embedding groove 83. In the present invention, the plastic-coated bracket 8 is formed by two-shot molding of plastic encapsulation. When the plastic-coated bracket 8 is formed, the whole claw 74 is buried in the plastic-coated bracket 8 and cooperates with the extension groove 84 to form a grasping force, preventing the heart rate monitoring sensor 6 from falling off the plastic shell and enhancing the installation stability of the heart rate monitoring sensor 6.

[0045] Reference Figure 7-Figure 9 , a downwardly extending support portion 85 is provided at the bottom position of the overmolded bracket 8, and a boss portion 125 engaged with the support portion 85 is provided at the bottom position of the shell bracket 12. In the present invention, when the overmolded bracket 8 is formed, a support portion 85 and a boss portion 125 flush with the bottom wall of the shell bracket 12 are formed at the bottom of the overmolded bracket 8 to enhance the stability of the connection between the overmolded bracket 8 and the shell bracket 12. A wedge-shaped groove that passes through the second embedding groove 82 is provided between the support portion 85 and the boss portion 125, and an extension portion extending into the support portion 85 is provided on the second hardware 72. 75. In the present invention, after the shell bracket 12 is formed, a partial notch is reserved in the boss portion 125. When the heart rate monitoring sensor 6 is implanted, the extension portion 75 of the second hardware 72 is embedded in the boss portion to form a limiting structure to avoid the second hardware 72 from being offset during the second injection molding of the overmolded bracket 8. The overmolded bracket 8 is entirely covered in the second hardware 72 to form a supporting portion 85 and a boss portion 125 that engage with each other, further enhancing the installation stability of the heart rate monitoring sensor 6 and improving the stability of the back cover structure of the plastic shell portion formed by the heart rate monitoring sensor 6.

[0046] An injection molding process for a smart watch plastic shell structure includes the following steps:

[0047] Step 1: The light guide column 2 is implanted into a primary molding die, and the housing bracket 12 is formed by one-shot injection molding.

[0048] Step 2: Assemble the sports intelligence module 3, the heart rate monitoring sensor 6 and the shell bracket 12 together in the secondary molding mold, and form a shell frame 11 on the outside of the shell bracket 12 through two-shot injection molding. The sports intelligence module 3 is overmolded in a rectangular frame 111 inserted into the inside of the shell bracket 12, and at the same time, a plastic-coated bracket 8 is formed between the shell bracket 12 and the heart rate monitoring sensor 6, so that a plastic-coated structure is formed between the sports intelligence module 3, the heart rate monitoring sensor 6 and the plastic shell of the watch.

[0049] Step 3: Install the optical sensor 4 and the secondary molded outer shell 1 together in the tertiary molding mold. At this time, the optical sensor 4 is set in the middle position of the three-shot mold groove 123. Through the third injection molding, an adhesive plastic part 5 is formed in the gap between the optical sensor 4 and the three-shot mold groove 123 to wrap the bottom surface of the optical sensor 4. The optical sensor 4 is implanted into the secondary molded product, and the third injection molding is completed. The plastic shell product with the sports intelligence module 3, optical sensor 4 and heart rate monitoring sensor 6 installed is formed.

[0050] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A smart watch plastic shell structure, comprising a shell (1), a light guide column (2), a sports intelligence module (3), an optical sensor (4) and a heart rate monitoring sensor (6), characterized in that: The outer shell (1) is divided into an outer shell frame (11) and a shell bracket (12), and the outer shell frame (11) is clamped at an outer position of the shell bracket (12), the light guide column (2) is installed at a side position of the outer shell (1), the sports intelligence module (3) is fixedly installed on the outer shell frame (11), and plastic-coated brackets (8) are installed at both sides of the top of the shell bracket (12), and a metal connector (7) is welded to the bottom of the heart rate monitoring sensor (6), and the bottom of the metal connector (7) is fixedly connected to the plastic-coated bracket (8); The housing frame (11) is provided with a rectangular frame (111) and a button guide groove (113) inserted into the housing bracket (12), and the motion intelligence module (3) is molded inside the rectangular frame (111). The outer side of the housing frame (11) is provided with a button installation groove (112) connected to the button guide groove (113), and the side of the housing frame (11) is provided with an outer notch (114) connected to the light guide column (2); One end of the shell bracket (12) is provided with a plastic-coated frame (121) that matches the rectangular frame (111), and the side of the shell bracket (12) is provided with an inner notch (124) that matches the light guide column (2), both sides of the top of the shell bracket (12) are provided with bracket parts (122) that match the plastic-coated bracket (8), and the top center of the shell bracket (12) is provided with a three-shot mold groove (123) that matches the optical sensor (4).

2. The smart watch plastic shell structure according to claim 1, characterized in that: An adhesive plastic part (5) is provided between the optical sensor (4) and the three-shot mold groove (123), and a through groove arranged in a "mesh" shape is provided in the middle of the adhesive plastic part (5).

3. The smart watch plastic shell structure according to claim 2, characterized in that: An electrical connection pin (61) is provided at the bottom of the heart rate monitoring sensor (6), and the electrical connection pin (61) passes through the plastic-coated bracket (8) and is provided at an internal position of the housing bracket (12).

4. The smart watch plastic shell structure according to claim 3, characterized in that: The metal connecting piece (7) comprises, in sequence, a first hardware piece (71), a third hardware piece (73) welded to the two ends of the bottom of the heart rate monitoring sensor (6), and a second hardware piece (72) welded to the middle of the bottom of the heart rate monitoring sensor (6). The bottoms of the first hardware piece (71), the second hardware piece (72) and the third hardware piece (73) are all provided with claws (74) embedded in the interior of the plastic-coated bracket (8).

5. The smart watch plastic shell structure according to claim 4, characterized in that: The surface of the plastic-coated bracket (8) is provided with a first embedding groove (81), a second embedding groove (82) and a third embedding groove (83) in sequence, and the bottoms of the first embedding groove (81), the second embedding groove (82) and the third embedding groove (83) are all provided with an extension groove (84).

6. The smart watch plastic shell structure according to claim 5, characterized in that: A downwardly extending support portion (85) is provided at the bottom of the plastic-coated bracket (8), and a boss portion (125) engaged with the support portion (85) is provided at the bottom of the housing bracket (12). A wedge-shaped groove penetrating the second mounting groove (82) is provided between the support portion (85) and the boss portion (125), and an extension portion (75) extending into the support portion (85) is provided on the second hardware component (72).

7. An injection molding process for a smart watch plastic housing structure according to any one of claims 2 to 6, characterized in that: The following steps are involved: Step 1: The light guide column (2) is implanted into a one-shot molding die, and the housing bracket (12) is formed by one-shot injection molding; Step 2: Assemble the sports intelligent module (3), the heart rate monitoring sensor (6) and the housing bracket (12) together in a secondary molding mold, form a housing frame (11) on the outside of the housing bracket (12) by two-shot injection molding, encapsulate the sports intelligent module (3) in a rectangular frame (111) inserted into the interior of the housing bracket (12), and simultaneously form an encapsulated plastic bracket (8) between the housing bracket (12) and the heart rate monitoring sensor (6), so that an encapsulated plastic structure is formed between the sports intelligent module (3), the heart rate monitoring sensor (6) and the plastic housing of the watch; Step 3: Install the optical sensor (4) and the secondary molded outer shell (1) together in the tertiary molding mold. At this time, the optical sensor (4) is set in the middle position of the three-shot mold groove (123). Through the third injection molding, a bonding plastic part (5) that wraps the bottom surface of the optical sensor (4) is formed in the gap between the optical sensor (4) and the three-shot mold groove (123). The optical sensor (4) is implanted into the secondary molded product, and the third injection molding is completed. The plastic shell product with the sports intelligence module (3), the optical sensor (4) and the heart rate monitoring sensor (6) installed is formed.

Images