Polishing jig for polishing PCBA

Abstract

The utility model relates to the technical field of polishing jigs, in particular to a polishing jig for polishing a PCBA (printed circuit board assembly), which comprises a lower die and an upper die movably connected with the lower die, a plurality of accommodating grooves for placing the PCBA are arranged between the lower die and the upper die, and a polishing area of the PCBA extends out of the accommodating grooves from one side of the lower die. The PCBA is positioned through the jig, the stability of the polishing process is guaranteed, it is guaranteed that the polishing area of the PCBA reaches the preset size standard, and the assembling requirement of the PCBA and a shell or other parts is met. The containing groove of the jig effectively protects the non-polishing area of the PCBA, and the PCBA is prevented from being damaged in the polishing process. A plurality of PCBAs can be clamped at a time and can be machined at the same time, automatic or semi-automatic grinding can be achieved conveniently, the requirement for manual operation is reduced, and production efficiency and safety are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of polishing jigs, and more particularly to a polishing jig for polishing PCBAs. Background Art

[0002] Printed Circuit Board Assembly (PCBA) is the combination of a printed circuit board (PCB) and various electronic components to create a fully functional circuit system. During the PCBA production process, dimensional tolerances are inevitable, whether in plastic molds, metal molds, or other related components. Due to limitations in manufacturing equipment and technology, achieving theoretically absolute dimensional precision is difficult for any product.

[0003] For small electronic products like card readers and USB flash drives, PCBA dimensional requirements are particularly stringent due to their small size, compact internal structure, and the need for precise coordination with the outer casing and other components. These products often strive for extreme space utilization, and any slight dimensional deviation can affect the product's assembly performance, aesthetic appearance, and even overall functionality.

[0004] When traditional circuit board manufacturers produce PCBAs, they usually choose positive or negative tolerances for production. When the size of the PCBA is too small, it is difficult to correct it through subsequent processing.

[0005] The above shortcomings need to be improved. Summary of the Invention

[0006] In order to solve or alleviate the problem that existing small-sized PCBAs are inconvenient to assemble due to production errors, the utility model provides a grinding jig for grinding PCBAs.

[0007] The technical solution of this utility model is as follows:

[0008] A polishing jig for polishing a PCBA includes a lower mold and an upper mold movably connected to the lower mold. A plurality of accommodating grooves for placing PCBAs are provided between the lower mold and the upper mold. The polishing area of the PCBA extends out of the accommodating groove from one side of the lower mold.

[0009] Furthermore, the first end of the lower mold is provided with a pivot, and the first end of the upper mold is rotatably sleeved on the pivot.

[0010] Furthermore, a first magnetic component is provided at the second end of the lower mold, and a second magnetic component is provided at the second end of the upper mold that is magnetically connected to the first magnetic component.

[0011] Furthermore, the accommodating groove includes a first half groove provided on the lower mold and a second half groove provided on the upper mold, a first positioning portion is provided in the first half groove, and a second positioning portion engaged with the first positioning portion is provided on the PCBA.

[0012] Furthermore, a sliding assembly is provided at the bottom of the lower mold, and the lower mold slides through the sliding assembly to drive each PCBA to pass through the polishing head of the polishing equipment in sequence. The sliding assembly includes a support plate, a slide rail is provided on the support plate, and a slider connected to the lower mold is slidably provided on the slide rail.

[0013] Furthermore, a first connecting hole is provided on the lower mold, a second connecting hole is provided on the slider, and a first fastener is provided through the first connecting hole and is threadedly connected to the second connecting hole.

[0014] Furthermore, a third connecting hole is provided at both ends of the slide rail, a fourth connecting hole is provided on the support plate, a second fastener is passed through the third connecting hole and is threadedly connected to the fourth connecting hole, and the top of the second fastener is higher than the sliding surface of the slider.

[0015] Furthermore, a first waist-shaped hole is provided on the support plate, a second waist-shaped hole is provided on the workbench of the grinding equipment, and a third fastener is provided through the first waist-shaped hole and the second waist-shaped hole.

[0016] Furthermore, a lifting mechanism is provided on the workbench of the grinding equipment, and the grinding head is provided at the movable end of the lifting mechanism.

[0017] Furthermore, the grinding head is provided with a control panel, which includes a control switch and an indicator light.

[0018] The present invention, according to the above-described solution, has the beneficial effect of ensuring the stability of the polishing process by positioning the PCBA using a jig, ensuring that the polishing area of the PCBA meets predetermined dimensional standards and satisfies assembly requirements with the housing or other components. The jig's accommodating groove effectively protects the non-polishing area of the PCBA, preventing damage during the polishing process. Multiple PCBAs can be clamped and processed simultaneously, facilitating automated or semi-automated polishing, reducing the need for manual operation and improving production efficiency and safety. The jig can be customized to meet different PCBA models and specifications, demonstrating strong adaptability and flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model when the PCBA is placed;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention when polishing PCBA;

[0023] Figure 4 This is a schematic diagram of the three-dimensional structure of the grinding jig in the present utility model;

[0024] Figure 5 This is an exploded schematic diagram of the structure of the grinding jig in the present utility model;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the grinding equipment in the present utility model.

[0026] In the figures, reference numerals are as follows: 1. grinding jig; 101. lower die; 102. upper die; 103. receiving groove; 104. pivot; 105. first magnetic member; 106. second magnetic member; 107. first half groove; 108. second half groove; 109. first positioning portion; 110. first connecting hole; 2. grinding equipment; 201. grinding head; 202. workbench; 203. second waist-shaped hole; 204. lifting mechanism; 205. lifting rod; 206. Sleeve; 207. Joystick; 208. Control panel; 209. Control switch; 210. Indicator light; 3. Sliding assembly; 301. Support plate; 302. Slide rail; 303. Slider; 304. Second connecting hole; 305. First fastener; 306. Third connecting hole; 307. Fourth connecting hole; 308. Second fastener; 309. First waist-shaped hole; 310. Third fastener; 4. PCBA; 401. Second positioning portion. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] It should be noted that when a component is referred to as being "fixed" or "set" or "connected" to another component, it may be located directly or indirectly on the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on this technical solution. The terms "first", "second", etc. are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0029] like Figures 1 to 4 As shown, a grinding jig for grinding a PCBA, described in one embodiment of the present invention, includes a lower mold 101 and an upper mold 102 movably connected to the lower mold 101. Multiple accommodating grooves 103 for accommodating PCBAs 4 are provided between the lower mold 101 and the upper mold 102. The grinding area of the PCBA 4 extends out of the accommodating grooves 103 from one side of the lower mold 101. A grinding device 2, such as a grinding wheel, abrasive belt, or a precision grinding head, is provided on one side of the upper mold 102 for grinding the edges or specific areas of the PCBA 4 extending out of the accommodating grooves 103. The accommodating grooves 103 allow the grinding area of the PCBA 4 to extend a certain length from the side of the lower mold 101, allowing the grinding device 2 to directly act on the area requiring size adjustment while protecting other parts of the PCBA 4 from being affected.

[0030] During use, the PCBA 4 to be polished is placed in the receiving groove 103 of the polishing jig 1. The PCBA 4 is manufactured using positive tolerances and is slightly oversized. The size and shape of the receiving groove 103 match the PCBA 4 to be polished, ensuring that the PCBA 4 is securely positioned during the polishing process. The polishing device 2 is activated, and the upper and lower molds 101 move relative to each other. The polishing head 201 of the polishing device 2 passes over the polishing area of each PCBA 4. If the polishing area is larger than the standard size, the polishing head 201 will polish away excess material. If the polishing area meets the standard size, the polishing head 201 will not come into contact with the PCBA 4. After polishing, the polishing area is dimensionalally inspected using a measuring tool (such as a vernier caliper, microscope, etc.) to ensure that it meets assembly requirements. If necessary, fine-tuning or repeated polishing steps can be performed. After polishing, the PCBA 4 is removed from the polishing jig 1 and cleaned as necessary to remove debris and residue generated during the polishing process.

[0031] In this embodiment, the PCBA 4 is positioned by the polishing jig 1 to ensure the stability of the polishing process, ensure that the polishing area of the PCBA 4 meets the predetermined dimensional standards, and meet the assembly requirements with the housing or other components. The accommodating groove 103 of the polishing jig 1 effectively protects the non-polishing area of the PCBA 4, preventing damage during the polishing process. Multiple PCBAs 4 can be clamped at one time and processed simultaneously, facilitating automated or semi-automated polishing, reducing the need for manual operation, and improving production efficiency and safety. The polishing jig 1 can be customized according to different models and specifications of PCBA 4, and has strong adaptability and flexibility.

[0032] like Figure 5 As shown, in a preferred embodiment, a pivot 104 is provided at the first end of the lower mold 101 , and a first end of the upper mold 102 is rotatably sleeved on the pivot 104 .

[0033] A first magnetic member 105 is provided at the second end of the lower mold 101, and a second magnetic member 106 is provided at the second end of the upper mold 102, which is magnetically connected to the first magnetic member 105. Both the first magnetic member 105 and the second magnetic member 106 are magnets, with opposite poles of the first magnetic member 105 and the second magnetic member 106 facing each other. In actual use, one of the first magnetic member 105 and the second magnetic member 106 is a magnet, and the other is made of ferromagnetic material. Alternatively, the second ends of the upper and lower molds 101 are detachably connected via a snap fastener.

[0034] Initially, upper mold 102 is open, allowing for easy placement of the PCBA 4. After placing the PCBA 4 to be polished, upper mold 102 rotates around pivot 104, placing it over lower mold 101. The first and second magnetic elements 105 engage, positioning the PCBA 4. The polishing process then proceeds, removing excess material. Once polishing is complete, upper mold 102 is rotated open to remove the polished PCBA 4.

[0035] In this embodiment, the upper mold 102 is magnetically connected to the second end of the lower mold 101. This allows the PCBA 4 to remain stable during the polishing process, thereby ensuring polishing quality. Furthermore, the upper mold 102 can freely rotate about the pivot 104, facilitating the placement, fixing, and removal of the PCBA 4.

[0036] like Figure 5 As shown, in a preferred embodiment, the accommodating groove 103 includes a first half groove 107 provided on the lower mold 101 and a second half groove 108 provided on the upper mold 102, a first positioning portion 109 is provided in the first half groove 107, and a second positioning portion 401 engaged with the first positioning portion 109 is provided on the PCBA4.

[0037] Specifically, the first positioning portion 109 is a protrusion, and the second positioning portion 401 is a groove engaged with the protrusion.

[0038] During the preparation phase, each PCBA 4 is placed into the first half-slot 107 of the lower mold 101. At this point, the second positioning portion 401 on the PCBA 4 engages with the first positioning portion 109 in the first half-slot 107, achieving initial positioning of the PCBA 4 and ensuring its stability during subsequent operations. Subsequently, the upper mold 102 is rotated to a closed position, with the second half-slot 108 tightly joined to the first half-slot 107, forming a complete receiving slot 103. Simultaneously, the magnetic elements between the upper mold 102 and the lower mold 101 engage, further securing the PCBA 4. At this point, the PCBA 4 is securely fixed within the polishing jig 1, ready for polishing.

[0039] In this embodiment, through the combination of the first half groove 107 and the second half groove 108, and the mutual engagement of the first positioning portion 109 and the second positioning portion 401, the engagement of the protrusion and the groove enables the PCBA4 to achieve higher positioning accuracy when placed, thereby enhancing the positioning accuracy and stability of the PCBA4 during the polishing process, and obtaining a PCBA4 with precise size and excellent surface quality, which can meet higher manufacturing requirements.

[0040] like Figure 5 As shown, in a preferred embodiment, a sliding assembly 3 is provided at the bottom of the lower mold 101, and the lower mold 101 slides through the sliding assembly 3 to drive each PCBA 4 to pass through the grinding head 201 of the grinding equipment 2 in sequence. The sliding assembly 3 includes a support plate 301, and a slide rail 302 is provided on the support plate 301. A slider 303 connected to the lower mold 101 is slidably provided on the slide rail 302.

[0041] During use, the upper and lower molds 101 slide along the slide rails 302, driven by a motor, cylinder, or manually. This also drives the PCBAs 4. During this sliding process, the PCBAs 4 pass through the polishing head 201 of the polishing device 2. The polishing head 201 polishes any excess material that exceeds the required dimensions until the desired dimensions and surface quality are achieved. As the lower mold 101 continues to slide, each PCBA 4 completes its polishing process and eventually slides out of the other end of the polishing device 2.

[0042] In this embodiment, the smooth operation of the sliding assembly 3 ensures the stability of the PCBA 4 during the polishing process, reducing polishing errors caused by vibration or external forces. In addition, this design improves the continuity and production efficiency of the polishing operation, allowing multiple PCBAs 4 to be polished continuously.

[0043] like Figure 3 、 Figure 5 and Figure 6As shown, in a preferred embodiment, a first connecting hole 110 is provided on the lower mold 101 , a second connecting hole 304 is provided on the slider 303 , and a first fastener 305 threadedly connected to the second connecting hole 304 is provided through the first connecting hole 110 .

[0044] The slide rail 302 is provided with third connection holes 306 at both ends, and the support plate 301 is provided with fourth connection holes 307. Second fasteners 308 are provided through the third connection holes 306 and are threadedly connected to the fourth connection holes 307. The top of the second fasteners 308 is higher than the sliding surface of the slider 303. This not only fixes the slide rail 302, but also limits the position of the slider 303 to prevent it from derailing.

[0045] The support plate 301 is provided with a first waist-shaped hole 309, and the workbench 202 of the polishing device 2 is provided with a second waist-shaped hole 203. A third fastener 310 is provided through the first waist-shaped hole 309 and the second waist-shaped hole 203. The waist-shaped holes can be adjusted to the installation position and are suitable for different products.

[0046] During assembly, first, align the two ends of the slide rail 302 through the third connection holes 306 with the fourth connection holes 307 on the support plate 301. Then, use a second fastener 308 (such as a bolt or screw) to pass through the third connection holes 306 and thread it into the fourth connection holes 307. The second fastener 308 not only firmly fixes the slide rail 302 to the support plate 301, but also prevents the slider 303 from derailing during the sliding process because the top of the second fastener 308 is higher than the sliding surface of the slider 303.

[0047] Next, the first connection hole 110 on the lower mold 101 is aligned with the second connection hole 304 on the slider 303 , and the lower mold 101 and the slider 303 are firmly connected using a first fastener 305 (such as a bolt or screw).

[0048] When installing the sliding assembly 3 onto the workbench 202 of the polishing apparatus 2, the first waist-shaped hole 309 on the support plate 301 and the second waist-shaped hole 203 on the workbench 202 are adjusted relative to each other to find a suitable installation position, depending on the specific size and shape of the PCBA 4 to be polished. Then, a third fastener 310 (such as a bolt or screw) is inserted through the first waist-shaped hole 309 and the second waist-shaped hole 203 to secure the support plate 301 to the workbench 202.

[0049] In this embodiment, by providing a second fastener 308, not only is the slide rail 302 securely mounted on the support plate 301, but the slider 303 is also prevented from derailing during the sliding process, thereby improving the stability and safety of the device. The waist-shaped hole design allows the sliding assembly 3 to be flexibly installed on different workbenches 202 and adjusted in position according to the specific needs of the product, making the device widely applicable to the polishing of various PCBAs 4. The threaded connection of the fasteners makes the assembly process simpler and faster, and also facilitates subsequent maintenance and replacement work. When adjustments or replacement of parts are required, it can be completed by simply loosening the corresponding fasteners.

[0050] like Figure 6 As shown, in a preferred embodiment, a lifting mechanism 204 is provided on the workbench 202 of the grinding device 2 , and the grinding head 201 is provided at the movable end of the lifting mechanism 204 .

[0051] Specifically, the lifting mechanism 204 includes a lifting rod 205, a sliding sleeve 206 is provided on the lifting rod 205, a rocker 207 is rotatably connected to the sliding sleeve 206, a gear is provided on the rocker 207, and teeth meshing with the gear are provided on the edge of the lifting rod 205.

[0052] During operation, the lifting mechanism 204 is first ensured to be in its initial position. Depending on the processing requirements, the operator manually or electrically rotates the rocker 207, causing the gear on the rocker 207 to rotate accordingly. Because the gear meshes with the rack on the edge of the lifting rod 205, the rotation of the gear drives the sliding sleeve 206 to slide on the lifting rod 205. The sliding sleeve 206 then moves the grinding head 201 up and down to adjust the height. Once the grinding head 201 is adjusted to the desired height, the grinding operation can begin.

[0053] In this embodiment, the provision of a lifting mechanism 204 allows the height of the grinding head 201 to be flexibly adjusted according to actual needs, adapting to the grinding of PCBAs 4 of varying thicknesses and shapes, thereby improving the adaptability of the device. Through the meshing transmission of a gear and rack, the lifting mechanism 204 enables precise control of the height of the grinding head 201. The sliding of the sleeve 206 on the lifting rod 205 ensures a stable and reliable lifting process, maintaining good performance over time and ensuring smooth grinding operations.

[0054] like Figure 6 As shown, in a preferred embodiment, a control panel 208 is provided on the grinding head 201, and the control panel 208 includes a control switch 209 and an indicator light 210. The control switch 209 includes a power switch and a lifting knob, and the indicator light 210 includes a power light and a lifting light.

[0055] During operation, the operator operates the device through the control panel 208. Pressing the power switch turns on the device, and the power light illuminates, indicating that the device is powered on and in standby mode. According to the specific requirements of the PCBA 4 to be polished, the operator rotates the lift knob to adjust the height of the polishing head 201. The lift light indicates the operating status of the lifting mechanism 204, such as ascending or descending, by flashing or continuously illuminating. As the lift knob is rotated, the lift light may indicate the operating status of the lifting mechanism 204 in different ways (such as flashing or continuously illuminating), such as ascending, descending, or reaching the set height. Once the polishing head 201 is adjusted to the appropriate height, the operator can begin polishing. After the polishing operation is completed, the operator turns off the power switch, and the power light turns off, indicating that the device has been powered off and entered a safe state. The polished PCBA 4 can then be removed and prepared for the next operation.

[0056] In this embodiment, by integrating the control switch 209 and the indicator light 210 on the control panel 208, the operator can intuitively understand the working status of the device and perform corresponding operations.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A grinding jig for grinding PCBA, characterized in that: The mold comprises a lower mold and an upper mold movably connected to the lower mold, wherein a plurality of receiving grooves for placing PCBAs are provided between the lower mold and the upper mold, and the polishing area of the PCBA extends out of the receiving groove from one side of the lower mold; The accommodating groove includes a first half groove provided on the lower mold and a second half groove provided on the upper mold, a first positioning portion is provided in the first half groove, and a second positioning portion engaged with the first positioning portion is provided on the PCBA.

2. A grinding jig for grinding PCBA according to claim 1, characterized in that: The first end of the lower mold is provided with a pivot, and the first end of the upper mold is rotatably sleeved on the pivot.

3. A grinding jig for grinding PCBA according to claim 1, characterized in that: The second end of the lower mold is provided with a first magnetic component, and the second end of the upper mold is provided with a second magnetic component magnetically connected to the first magnetic component.

4. A grinding jig for grinding PCBA according to any one of claims 1 to 3, characterized in that: A sliding assembly is provided at the bottom of the lower mold, and the lower mold slides through the sliding assembly to drive each PCBA to pass through the polishing head of the polishing equipment in sequence. The sliding assembly includes a support plate, a slide rail is provided on the support plate, and a slider connected to the lower mold is slidably provided on the slide rail.

5. A grinding jig for grinding PCBA according to claim 4, characterized in that: The lower die is provided with a first connecting hole, the slider is provided with a second connecting hole, and a first fastener is provided through the first connecting hole and is threadedly connected to the second connecting hole.

6. A grinding jig for grinding PCBA according to claim 4, characterized in that: A third connecting hole is provided at both ends of the slide rail, a fourth connecting hole is provided on the support plate, a second fastener threadedly connected to the fourth connecting hole is provided through the third connecting hole, and the top of the second fastener is higher than the sliding surface of the slider.

7. A grinding jig for grinding PCBA according to claim 4, characterized in that: The support plate is provided with a first waist-shaped hole, the workbench of the grinding equipment is provided with a second waist-shaped hole, and a third fastener is provided through the first waist-shaped hole and the second waist-shaped hole.

8. The grinding jig for grinding PCBA according to claim 4, characterized in that: A lifting mechanism is provided on the workbench of the grinding equipment, and the grinding head is provided at the movable end of the lifting mechanism.

9. A grinding jig for grinding PCBA according to claim 4, characterized in that: The grinding head is provided with a control panel, which includes a control switch and an indicator light.

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