Instrument rotary assembly structure and instrument assembly method

Abstract

This invention relates to the field of instrumentation, and more particularly to an instrument rotary assembly structure and assembly method. The instrument rotary assembly structure includes a PMMA top cover, a display PC middle plate, and an ABS bottom shell. The display PC middle plate is installed in the cavity between the ABS bottom shell and the PMMA top cover. The PMMA top cover has a mounting groove corresponding to the shape of the ABS bottom shell. Several limiting protrusions are provided on the side wall of the mounting groove. A positioning edge extends outward from the side wall of the ABS bottom shell. A clearance slot is provided on the positioning edge corresponding to each limiting protrusion. The limiting protrusions pass through the clearance slots and, after the ABS bottom shell and PMMA top cover rotate relative to each other and are misaligned with the clearance slots, limit the back side of the positioning edge. The groove formed by the side wall of the mounting groove, the side wall of the ABS bottom shell, and the back side of the positioning edge is filled with waterproof adhesive. The above-mentioned instrument rotary assembly structure and assembly method uses a rotating snap-fit ​​and adhesive fixing method to achieve reliable assembly of the PMMA top cover and the ABS bottom shell.

Description

Technical Field

[0001] This invention relates to the field of instrumentation, and more particularly to an instrument rotary assembly structure and an instrument assembly method. Background Technology

[0002] Electric bicycles and other low-speed electric vehicles are equipped with instrument panels. These panels serve as the interface for information exchange between the rider and the vehicle's controller, primarily displaying user-required information such as the battery's current charge level, gear position, speed, and cumulative mileage. Since electric vehicle instrument panels operate in outdoor environments and contain circuit boards, they are susceptible to moisture damage and malfunction, reducing their lifespan. Therefore, an external casing is necessary for protection.

[0003] Traditional instruments use either photocured PC (polycarbonate) sheets or PMMA (polymethyl methacrylate) ABS (acrylonitrile-butadiene-styrene copolymer) for secondary injection molding to form the instrument panel. PC is tough and not easily broken, but its hardness is insufficient, requiring photocuring, which increases costs. PMMA ABS requires two sets of injection molds, and the fusion of the two materials can easily deform, leading to product failure.

[0004] The existing structure uses a PMMA top cover 1 and an ABS bottom shell 3 assembled by snap-fit, such as Figure 4 As shown, PMMA material is relatively brittle but has high hardness, so it does not require light curing. However, the snap-fit ​​assembly method is prone to snap breakage and failure, which leads to product assembly failure. The mass production assembly success rate is extremely low and urgently needs improvement. Summary of the Invention

[0005] In view of the above problems, one object of the present invention is to provide an instrument rotary assembly structure to solve the problem of installation failure caused by the characteristics of PMMA material, and to avoid the situation that the buckles are easily broken due to vibration during assembly and use.

[0006] Another objective of this invention is to provide an instrument assembly method that changes the original snap-fit ​​assembly method, ensuring assembly quality and improving yield.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An instrument rotary assembly structure includes a PMMA top cover, a display PC middle plate, and an ABS bottom shell. The display PC middle plate is installed in the cavity between the ABS bottom shell and the PMMA top cover. The PMMA top cover has a mounting groove corresponding to the shape of the ABS bottom shell. Several limiting protrusions are provided on the side wall of the mounting groove. The side wall of the ABS bottom shell extends outward to form a positioning edge. The positioning edge has clearance slots corresponding to each limiting protrusion. The limiting protrusions pass through the clearance slots and are positioned on the back side of the positioning edge after the ABS bottom shell and the PMMA top cover rotate relative to each other and are misaligned with the clearance slots. The groove formed by the side wall of the mounting groove, the side wall of the ABS bottom shell, and the back side of the positioning edge is filled with waterproof adhesive.

[0009] Optionally, a blocking block is provided on the back of the positioning edge. The blocking block is located between two adjacent clearance slots and is used to block the limiting protrusion, thereby limiting the relative rotation angle between the ABS bottom shell and the PMMA top cover.

[0010] Optionally, four limiting protrusions are evenly distributed along the circumference of the side wall of the mounting groove, four clearance slots are correspondingly provided, and two blocking blocks are provided, with the two blocking blocks being centrally symmetrically distributed.

[0011] Optionally, a PET film is attached to the surface of the PC middle plate, and the PC middle plate is fixed to the ABS base shell.

[0012] Optionally, the ABS base shell is provided with anti-foolproof posts for positioning the display PC middle plate.

[0013] On the other hand, the present invention adopts the following technical solution:

[0014] An instrument assembly method, based on the above-mentioned instrument rotary assembly structure, includes the following steps:

[0015] Step 1: Fix the PC middle plate to the ABS bottom shell;

[0016] Step 2: Align the limiting protrusion on the PMMA top cover with the clearance groove on the ABS bottom shell, so that the ABS bottom shell is embedded into the mounting groove of the PMMA top cover.

[0017] Step 3: Rotate the ABS bottom shell relative to the PMMA top cover to misalign the limiting protrusion with the clearance groove, thereby locking the ABS bottom shell by the limiting protrusion.

[0018] Step 4: Apply waterproof adhesive into the groove formed by the mounting slot of the PMMA top cover and the side wall and positioning edge of the ABS bottom shell. Let it stand until the adhesive cures. Assembly is complete.

[0019] Optionally, in step one, a PET film is first pasted onto the surface of the display PC panel, and then the display PC panel is fixed in place.

[0020] Optionally, in step four, the waterproof adhesive is a single-component adhesive, and the settling time is 30 minutes.

[0021] In summary, the beneficial effects of the present invention are that the instrument rotation assembly structure and instrument assembly method adopt a rotation buckle and glue fixing form, which realizes the reliable assembly of PMMA top cover and ABS bottom shell, changes the status quo in the industry that PMMA material characteristics make it impossible to assemble independently, and effectively improves production efficiency, product quality, assembly consistency, waterproofness, service life and other aspects. Attached Figure Description

[0022] Figure 1 This is an assembly diagram of the instrument rotary assembly structure provided in the embodiment of the present invention. Figure 1 ;

[0023] Figure 2 This is an assembly diagram of the instrument rotary assembly structure provided in the embodiment of the present invention. Figure 2 ;

[0024] Figure 3 yes Figure 2 Schematic diagram of the cross section at point AA;

[0025] Figure 4 This is a schematic diagram of the existing PMMA top cover and ABS bottom shell snap-fit ​​assembly.

[0026] In the picture:

[0027] 1. PMMA top cover; 2. Display PC middle plate; 3. ABS bottom shell; 4. Mounting groove; 5. Limiting protrusion; 6. Positioning edge; 7. Clearance groove; 8. Waterproof adhesive; 9. Blocking block; 10. Anti-fool post. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, a mechanical connection, an electrical connection, or an indirect connection via an intermediate medium. They can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In the description of this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. The technical solutions of this invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] Please see Figures 1 to 3 As shown, this preferred embodiment provides an instrument rotating assembly structure, including a PMMA top cover 1, a display PC middle plate 2, and an ABS bottom shell 3.

[0032] The display PC middle plate 2 is installed in the cavity between the ABS bottom shell 3 and the PMMA top cover 1. Furthermore, a PET film is attached to the surface of the display PC middle plate 2, and the display PC middle plate 2 is fixed to the ABS bottom shell 3.

[0033] Specifically, the PMMA top cover 1 is provided with an installation groove 4 corresponding to the shape of the ABS bottom shell 3. Several limiting protrusions 5 are provided on the side wall of the installation groove 4. The side wall of the ABS bottom shell 3 extends outward to form a positioning edge 6. The positioning edge 6 is provided with a clearance slot 7 corresponding to each limiting protrusion 5. The limiting protrusion 5 passes through the clearance slot 7 and passes through the positioning edge 6. After the ABS bottom shell 3 and the PMMA top cover 1 rotate relative to each other and are misaligned with the clearance slot 7, the back of the positioning edge 6 is limited. The groove formed by the side wall of the installation groove 4, the side wall of the ABS bottom shell 3 and the back of the positioning edge 6 is filled with waterproof adhesive 8.

[0034] Furthermore, a blocking block 9 is provided on the back of the positioning edge 6. The blocking block 9 is located between two adjacent clearance slots 7 and is used to block the limiting protrusion 5, thereby limiting the relative rotation angle between the ABS bottom shell 3 and the PMMA top cover 1.

[0035] Preferably, there are four limiting protrusions 5 evenly distributed along the circumference of the side wall of the mounting groove 4, four corresponding clearance slots 7, and two blocking blocks 9, which are centrally symmetrically distributed.

[0036] Furthermore, the ABS base shell 3 is provided with anti-foolproof posts 10 for positioning the display PC middle plate 2.

[0037] Therefore, this rotary assembly structure can solve the fracture problem caused by the characteristics of PMMA material, change the current situation in the industry where PMMA material characteristics prevent independent assembly, greatly improve production efficiency, and significantly improve product quality, product assembly consistency, product waterproof consistency, and product service life.

[0038] Based on this, this embodiment also provides an instrument assembly method, which, based on the above-mentioned instrument rotation assembly structure, includes the following steps:

[0039] Step 1: Accurately fix the display PC middle plate 2 onto the ABS base shell 3, and first attach the PET film to the display PC middle plate 2 as needed.

[0040] Step 2: Align the limiting protrusion 5 on the PMMA top cover 1 with the clearance groove 7 on the ABS bottom shell 3, so that the ABS bottom shell 3 together with the display PC middle plate 2 is embedded into the mounting groove 4 of the PMMA top cover 1.

[0041] Step 3: Rotate the ABS bottom shell 3 relative to the PMMA top cover 1. Here, we take 30° as an example to make the limiting protrusion 5 misalign with the clearance groove 7. Then, the limiting protrusion 5 locks the ABS bottom shell 3. Furthermore, the limiting protrusion 5 abuts against the blocking block 9 on the positioning edge 6 to ensure stable position.

[0042] Step 4: Apply waterproof adhesive 8 into the groove formed by the mounting groove 4 of the PMMA top cover 1 and the side wall and positioning edge 6 of the ABS bottom shell 3. It is preferred to use a single-component adhesive here. Let it stand for 30 minutes to allow the adhesive to cure, and the assembly is complete.

[0043] Therefore, this instrument assembly method is simple to operate, can reduce labor and material costs, ensure reliable product quality and high waterproof consistency, solve the defects of the current snap-on installation method in the industry, and effectively avoid the problem of PMMA top cover 1 breaking due to stress.

[0044] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An instrument rotary assembly structure, characterized in that, The system includes a PMMA top cover (1), a display PC middle plate (2), and an ABS bottom shell (3). The display PC middle plate (2) is installed in the cavity between the ABS bottom shell (3) and the PMMA top cover (1). The PMMA top cover (1) has a mounting groove (4) corresponding to the shape of the ABS bottom shell (3). The side wall of the mounting groove (4) has several limiting protrusions (5). The side wall of the ABS bottom shell (3) extends outward to form a positioning edge (6). The mounting groove (4) is provided with a clearance slot (7) corresponding to each of the limiting protrusions (5). The limiting protrusion (5) passes through the clearance slot (7) and passes through the positioning edge (6). After the ABS bottom shell (3) and the PMMA top cover (1) rotate relative to each other and are misaligned with the clearance slot (7), the mounting groove (4) is filled with waterproof glue (8). A blocking block (9) is provided on the back side of the positioning edge (6). The blocking block (9) is located between two adjacent clearance slots (7) and is used to block the limiting protrusion (5), thereby limiting the relative rotation angle between the ABS bottom shell (3) and the PMMA top cover (1).

2. The instrument rotary assembly structure according to claim 1, characterized in that, Four limiting protrusions (5) are evenly distributed along the circumference of the side wall of the mounting groove (4), four clearance slots (7) are correspondingly provided, and two blocking blocks (9) are provided, with the two blocking blocks (9) being centrally symmetrically distributed.

3. The instrument rotary assembly structure according to claim 1, characterized in that, The surface of the display PC middle plate (2) is covered with a PET film, and the display PC middle plate (2) is fixed to the ABS bottom shell (3).

4. The instrument rotary assembly structure according to claim 3, characterized in that, The ABS base shell (3) is provided with anti-foolproof posts (10) for positioning the display PC middle plate (2).

5. An instrument assembly method, based on the instrument rotary assembly structure according to any one of claims 1-4, characterized in that, Including the following steps: Step 1: Fix the PC middle plate (2) onto the ABS bottom shell (3); Step 2: Align the limiting protrusion (5) on the PMMA top cover (1) with the clearance groove (7) on the ABS bottom shell (3) so that the ABS bottom shell (3) is embedded in the mounting groove (4) of the PMMA top cover (1); Step 3: Rotate the ABS bottom shell (3) relative to the PMMA top cover (1) to make the limiting protrusion (5) and the clearance groove (7) misaligned, and then the limiting protrusion (5) locks the ABS bottom shell (3). Step 4: Apply waterproof adhesive (8) into the groove formed by the mounting slot (4) of the PMMA top cover (1) and the side wall and positioning edge (6) of the ABS bottom shell (3), let it stand until the adhesive cures, and the assembly is complete.

6. The instrument assembly method according to claim 5, characterized in that, In step one, first paste a PET film onto the surface of the display PC middle plate (2), and then fix the display PC middle plate (2).

7. The instrument assembly method according to claim 5, characterized in that, In step four, the waterproof adhesive (8) is a single-component adhesive, and the standing time is 30 minutes.

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