PCBA fixing jig for automatic dispensing machine

Abstract

This utility model belongs to the field of electronic manufacturing fixture technology, and particularly relates to a PCBA fixing fixture for an automatic dispensing machine. Its features include an upper cover and a base, which are positioned by a pin and a hole and connected by screws. The upper cover includes a hollow frame and positioning ribs. The hollow frame has several positioning ribs, and the lower edge of each rib has several positioning grooves. Multiple windows are formed between adjacent positioning ribs and the hollow frame. The base has a PCBA board mounting area, a fiber optic pre-reservation area, and a positioning area. After assembly, the PCBA board mounting area and the fiber optic pre-reservation area are located below the windows, and the positioning area is located below the positioning grooves. The pin is a cylindrical pin with a one-way bevel at its lower end, and the corresponding hole has a corresponding bevel at its bottom, reducing PCBA displacement to within ±0.05mm and increasing the dispensing pass rate to 99.5%.

Description

Technical Field

[0001] This utility model belongs to the field of electronic manufacturing fixture technology, and in particular relates to a PCBA fixing fixture for an automatic dispensing machine. Background Technology

[0002] In the electronics manufacturing industry, dispensing technology is widely used in PCBA conformal coating, chip packaging, and other scenarios. Traditional automatic dispensing machine fixtures generally have the following defects: 1) Insecure fixing: Existing fixtures mostly use single-point clips or simple screw clamps, which can easily cause PCBA displacement due to vibration or adhesive impact, resulting in dispensing path deviation (the deviation can reach ±0.5mm). 2) Lack of foolproof design: Operators may place the fixture upside down when installing the top cover, causing pressure to concentrate on sensitive components at the bottom of the PCBA (such as surface mount capacitors and SMD inductors), leading to component damage (damage rate of about 3%-5%). 3) Inconvenient observation: Enclosed fixtures require machine shutdown and disassembly to check the dispensing effect, with an average inspection time of 2-3 minutes, reducing overall production efficiency by 10%-15%. 4) Insufficient adaptability: The fixture height design relies on empirical parameters and has poor matching with the dispensing machine needle stroke. If the height exceeds the needle stroke (e.g., the maximum needle stroke is 15mm, and the fixture height is 18mm), it may cause needle collision or adhesive suspension. To improve the working efficiency of automatic dispensing machines, it is necessary to improve the fixture. Utility Model Content

[0003] The purpose of this invention is to provide a PCBA fixing fixture for an automatic dispensing machine, which overcomes the shortcomings of the prior art and is suitable for the dispensing process of precision electronic components. Through structural optimization, it solves problems such as poor PCBA clamping stability and high risk of misoperation, thereby improving the efficiency of the dispensing process and increasing the yield of electronic products.

[0004] To achieve the above objectives, this utility model employs the following technical solution:

[0005] An automatic dispensing machine PCBA fixing fixture includes a top cover and a base. The top cover and base are positioned by a pin and a hole and connected by screws. The top cover includes a hollow plate frame and positioning ribs. The hollow plate frame has several positioning ribs, and the lower edge of the positioning ribs has several positioning grooves. Multiple windows are formed between adjacent positioning ribs and the hollow plate frame. The base is a plate structure with a PCBA board mounting area, an optical fiber reserved area, and a positioning area. After the top cover and base are assembled, the PCBA board mounting area and the optical fiber reserved area are located below the windows, and the positioning area is located below the positioning grooves. The pin is a cylindrical pin with a one-way bevel at its lower end, and the bottom of the corresponding hole has a corresponding mating bevel.

[0006] Furthermore, the screws are located on the left and right edges of the top cover and the base.

[0007] Furthermore, the top cover and base are machined aluminum alloy parts with a machining accuracy of ±0.02mm and an edge chamfer of 1mm±0.05mm.

[0008] Furthermore, the surfaces of the top cover and the base are provided with a 50-200μm sandblasted oxidation treatment layer.

[0009] Furthermore, the surface roughness of the machining is Ra3.2.

[0010] Furthermore, the fixing fixture is used in conjunction with the HY300A automatic dispensing machine.

[0011] Furthermore, the top cover and base are machined parts made of 6061 or 6063 aluminum alloy.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1) This utility model adopts a double-avoiding groove symmetrical design combined with six screw clamping, which reduces the PCBA displacement to within ±0.05mm and increases the dispensing qualification rate to 99.5%.

[0014] 2) The pin-proof structure designed in this utility model can provide intuitive tactile feedback on installation errors, and the misoperation rate is close to zero (the number of misinstallations is ≤1 in 1000 tests);

[0015] 3) The transparent observation window designed in this utility model supports dynamic monitoring of the dispensing process, shortening the single inspection time to 15 seconds and increasing the daily production capacity by 20%-30%;

[0016] 4) The top cover and base of this utility model are designed to be lightweight (the weight of a single fixture is ≤500g), which reduces the labor intensity of the operators. Attached Figure Description

[0017] Figure 1 This is a scenario diagram illustrating the use of this utility model in conjunction with a dispensing machine.

[0018] Figure 2 This is a schematic diagram of the upper cover structure in an embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of the base structure in an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram illustrating the reverse installation rejection of the anti-foolproof pin in an embodiment of this utility model;

[0021] Figure 5 This is a schematic diagram showing the details of the pin and socket mating in an embodiment of this utility model;

[0022] In the diagram: 1-Top cover, 2-Base, 3-Pin, 4-Socket, 5-Screw, 6-Hollow board frame, 7-Positioning rib, 8-Positioning groove, 9-Window, 10-PCBA board mounting area, 11-Fiber optic reserved area, 12-Positioning area, 13-Dispensing machine needle. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0025] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but only to illustrate selected embodiments of the invention.

[0026] See Figure 1-5 This is a schematic diagram of the PCBA fixing fixture for an automatic dispensing machine of this utility model. It includes an upper cover 1 and a base 2. The upper cover 1 and the base 2 are positioned by a pin 3 and a socket 4 and are connected by screws 5. The upper cover 1 includes a hollow plate frame 6 and positioning ribs 7. The hollow plate frame 6 is provided with several positioning ribs 7, and the lower edge of the positioning ribs 7 is provided with several positioning grooves 8. Multiple windows 9 are formed between adjacent positioning ribs 7 and the hollow plate frame 6. The base 2 is a plate-shaped structure with a PCBA board mounting area 10, an optical fiber reserved area 11 and a positioning area 12. After the upper cover 1 and the base 2 are assembled, the PCBA board mounting area 10 and the optical fiber reserved area 11 are located below the windows 9, and the positioning area 12 is located below the positioning grooves 8. The pin 3 is a cylindrical pin with a one-way bevel at its lower end, and the bottom of the corresponding socket 4 is provided with a corresponding mating bevel.

[0027] In this embodiment, six screws 5 are symmetrically located on the left and right edges of the upper cover 1 and the base 2.

[0028] The top cover 1 and the base 2 are machined from 6061 or 6063 aluminum alloy with a machining accuracy of ±0.02mm and an edge chamfer of 1mm ±0.05mm. The surfaces of the top cover 1 and the base 2 are treated with a 50-200μm sandblasted anodizing layer. The surface roughness is Ra3.2, combining lightweight and durability.

[0029] In use, clean the upper surface of the base 2 and place the PCBA (1.6mm thick substrate) flat on the positioning area 12, ensuring that the components on the PCBA are aligned with the window 9 (gap ≥ 0.5mm). The upper cover 1 is fastened to the base 2's insertion hole 4 via the pin 3. Tighten the six M4 screws 5 gradually (recommended torque 0.5N·m, calibrated with a digital torque wrench). The one-way angled design of the pin 3 provides a foolproof function; if installed in reverse, the pin 3 and insertion hole 4 will be misaligned and unable to fasten. A 1mm thick acrylic plate is embedded in the window 9 of the upper cover 1 to enable real-time observation of the dispensing process. The height from the top of the upper cover 1 to the PCBA surface is 12mm ± 0.1mm, which is compatible with the needle stroke 13 of the Shenzhen Haiyu Company HY300A automatic dispensing machine. This utility model, through structural optimization, solves the technical problems of traditional fixtures being unstable, having a high risk of misoperation, and being unable to monitor in real time, significantly improving the stability and production efficiency of the dispensing process.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A PCBA fixing fixture for an automatic dispensing machine, characterized in that, The device includes a top cover and a base, which are positioned by a pin and a socket and connected by screws. The top cover includes a hollow plate frame and positioning ribs. The hollow plate frame has several positioning ribs, and the lower edge of the positioning ribs has several positioning grooves. Multiple windows are formed between adjacent positioning ribs and the hollow plate frame. The base is a plate structure with a PCBA board mounting area, an optical fiber reserved area, and a positioning area. After the top cover and base are assembled, the PCBA board mounting area and the optical fiber reserved area are located below the windows, and the positioning area is located below the positioning grooves. The pin is a cylindrical pin with a one-way bevel at its lower end, and the bottom of the corresponding socket has a corresponding mating bevel.

2. The PCBA fixing fixture for an automatic dispensing machine according to claim 1, characterized in that, The screws are located on the left and right edges of the top cover and the base.

3. The PCBA fixing fixture for an automatic dispensing machine according to claim 1, characterized in that, The top cover and base are machined aluminum alloy parts with a machining accuracy of ±0.02mm and an edge chamfer of 1mm ±0.05mm.

4. The PCBA fixing fixture for an automatic dispensing machine according to claim 3, characterized in that, The surfaces of the top cover and the base are provided with a 50-200μm sandblasted oxidation treatment layer.

5. The PCBA fixing fixture for an automatic dispensing machine according to claim 3, characterized in that, The surface roughness of the machining process is Ra3.

2.

6. The PCBA fixing fixture for an automatic dispensing machine according to claim 1, characterized in that, The fixture is used in conjunction with the HY300A automatic dispensing machine.

7. The PCBA fixing fixture for an automatic dispensing machine according to claim 1, characterized in that, The top cover and base are machined parts made of 6061 or 6063 aluminum alloy.

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