A batch test fixture for ultrasonic testing of plastic encapsulated components and a method of using the same
By designing a batch testing fixture for ultrasonic testing of plastic-encapsulated components, the mechanical structure of the cover plate and substrate is used to achieve batch transfer and uniform orientation of components, which solves the problem of low efficiency in the existing technology, improves testing efficiency and signal accuracy, and reduces the risk of component damage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NO 24 RES INST OF CETC
- Filing Date
- 2025-07-11
- Publication Date
- 2026-06-26
AI Technical Summary
In the ultrasonic testing of plastic-encapsulated components, existing technologies cannot achieve batch testing, resulting in low efficiency, and manual operation is prone to damage or loss of components.
Design a batch testing fixture for ultrasonic testing of plastic-encapsulated components. Through the cooperation of the cover plate and the substrate, the components can be transferred in two steps. By utilizing the correspondence between the protrusion and the material cavity, the uniformity of the component posture can be ensured and no manual adjustment is required. Combined with the intermittent enclosure structure and directional flow design, the interference of air bubbles can be reduced.
It enables batch transfer of components, improves testing efficiency, ensures testing consistency, reduces component damage and loss, and enhances the accuracy of testing signals.
Smart Images
Figure CN120741625B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of semiconductor component testing technology, specifically relating to a batch testing fixture for ultrasonic testing of plastic-encapsulated components and its usage method. Background Technology
[0002] Ultrasonic scanning testing is a non-destructive testing technique that uses high-frequency ultrasonic waves to detect the internal structure and defects of devices. In the electronics field, it is mainly used for component screening and failure analysis.
[0003] Currently, the number of plastic-encapsulated components being tested in ultrasonic scanning screening is increasing, making it the most frequently tested packaging type. During ultrasonic testing of plastic-encapsulated components, operators need to remove each component from the tray and place it onto the stage of the ultrasonic testing instrument. To avoid component stacking and to keep the top view of the components facing upwards, operators must manually adjust the orientation and position of the components. After the test, the components must be placed back into the tray. This entire testing process makes it impossible to perform batch placement of components for testing, resulting in low efficiency. Furthermore, the frequent handling of components during testing increases the risk of pin damage and component loss. Summary of the Invention
[0004] To address the technical problems existing in the prior art, this invention provides a batch testing fixture for ultrasonic testing of plastic-encapsulated components and its usage method.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A batch testing fixture for ultrasonic testing of encapsulated components is used to transfer components in batches from a tray to an ultrasonic testing instrument and can be adapted to be installed on the stage of the ultrasonic testing instrument for ultrasonic testing. The tray includes a tray body and a first protrusion protruding from the top surface of the tray body. A stepped surface is formed between the top surface of the tray body and the top surface of the first protrusion. The first protrusion has several spaced first cavities for placing components.
[0007] A cover plate, used to close with the tray to facilitate the initial transfer of components, has several spaced-apart second protrusions at its lower end. The lower end face of the cover plate has a recessed cavity facing away from the lower end face of the cover plate. Several second protrusions are arrayed in the recessed cavity. Several through holes, each communicating with and corresponding to the recessed cavity, are formed on both side walls of the cover plate. When the cover plate is closed on the upper end of the tray, the second protrusions correspond one-to-one with the positions of the first material cavity to transfer components from the first material cavity to the cover plate; and
[0008] The substrate is used to close with the cover plate to realize the transfer of components again. The upper end of the substrate is provided with several second material cavities whose positions correspond one-to-one with the second protrusions. The upper surface of the substrate is provided with several arrayed enclosure components. Each enclosure component includes at least four enclosure blocks. The enclosure blocks are arranged in pairs opposite each other and spaced apart. There is a gap between each two adjacent enclosure blocks and they can be closed to form the second material cavity. When the substrate is closed with the cover plate, the components can be transferred one-to-one into the second material cavity and adapted to be installed on the stage for testing.
[0009] Furthermore, the lower end face of the cover plate is adapted to the step surface.
[0010] Furthermore, after the substrate and the cover plate are closed, the second protrusion can partially extend into the second material cavity.
[0011] Furthermore, a handle is connected to each side of the substrate. The handle includes a horizontal portion that protrudes horizontally from the side wall of the substrate away from the side wall of the substrate and a vertical portion that is vertically connected to the horizontal portion. When the substrate is fixed in the slot of the stage, the horizontal portion abuts against the surface of the stage.
[0012] Furthermore, both the substrate and the cover plate are made of plexiglass.
[0013] A method for using a batch testing fixture for ultrasonic testing of molded components, applicable to the aforementioned batch testing fixture for ultrasonic testing of molded components, the method of using the batch testing fixture for ultrasonic testing of molded components includes the following steps:
[0014] 1) Cover the material tray with the cover plate, and align the second protrusion with the components placed in the first material cavity with their top view facing out of the material tray;
[0015] 2) Flip the cover plate 180° so that the tray is upside down on the cover plate. The components in the first material cavity are supported on the second protrusion, and the top surface of the components abuts against the second protrusion. Then remove the tray.
[0016] 3) Cover the substrate on top of the cover plate so that the positions of the components on the second protrusion correspond one-to-one with the positions of the second material cavity on the substrate, and rotate the clamp 180° so that the components can be accommodated one-to-one in the second material cavity, with the top view of the components facing outward.
[0017] 4) Place the fixture on the stage, fix the substrate at the corresponding position on the stage, remove the cover plate covering the substrate, and start the ultrasonic testing test.
[0018] 5) After the test is completed, the cover plate is placed over the substrate, and the clamp is rotated 180° so that the components are supported on the second protrusion.
[0019] 6) Remove the substrate, cover the tray with the cover plate, and then rotate the cover plate 180°. After the components are inspected, they are transferred to the first material cavity in batches, with the top view of the components facing outward.
[0020] In summary, the beneficial effects of this invention are as follows: 1. It enables batch transfer, significantly improving detection efficiency. Traditional processes require manual handling and adjustment of components one by one. This solution, through a two-step batch transfer design using a cover plate and a substrate, utilizes the one-to-one correspondence between the second protrusion and the first and second material cavities to upgrade "single operation" to "array-style synchronous transfer," allowing the transfer of dozens to hundreds of components at a time, significantly shortening transfer time. The transfer process requires no manual intervention in position and orientation, eliminating the need for repeated alignment and adjustment steps. 2. It ensures precise and uniform component posture, improving detection consistency. During the transfer from the tray to the cover plate and then to the substrate, the engagement of the recessed cavity with the first protrusion and the guiding positioning of the second protrusion with the second material cavity force the components to maintain a top-viewing orientation, avoiding posture confusion (such as tilting or stacking) caused by manual adjustment. This ensures that the relative position of the detection surface of all components and the ultrasonic probe is consistent, reducing detection signal fluctuations caused by posture differences and improving data reliability. 3. It reduces manual contact, lowering the risk of component damage and loss. The fixture transfers components entirely through a mechanical structure. Operators only need to pick up and put down the tray, cover plate, and substrate, without touching the component itself. This reduces problems such as bent leads, scratched plastic casings, and lost components from the source (especially for components with dense leads and small size). The closed design of the cover plate and substrate (such as recessed cavities and intermittent enclosure structures) creates a protective space during transfer and flipping, preventing components from falling off due to collisions and vibrations, further reducing accidental losses. Fourth, the second material chamber has an intermittent enclosure structure. Through the gaps between adjacent enclosure blocks, it breaks the dead corners of traditional closed cavities, allowing water to smoothly fill and expel air, preventing air bubbles from being trapped between the component and the cavity wall. The through holes on the cover plate guide the water flow smoothly, reducing the phenomenon of turbulent air entrainment and ensuring that air is discharged in an orderly manner from the through holes. This fundamentally reduces the interference of air bubbles on the ultrasonic propagation path, ensuring that the detection signal truly reflects the internal structure of the component and improving the accuracy of defect identification. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of the components provided by the present invention loaded in a material tray.
[0022] Figure 2This is a schematic diagram of the structure of a batch testing fixture for ultrasonic testing of plastic-encapsulated components provided by the present invention.
[0023] Figure 3 yes Figure 2 A three-dimensional structural diagram of the middle cover plate.
[0024] Figure 4 This is a top view of the cover plate of the present invention covering the material tray.
[0025] Figure 5 yes Figure 4 Sectional view along the AA direction.
[0026] Figure 6 yes Figure 5 A magnified view of part A in the middle.
[0027] Figure 7 This is a three-dimensional structural diagram of the substrate in the invention.
[0028] Figure 8 yes Figure 7 A magnified view of a section at point B.
[0029] Figure 9 This is a top view of the cover plate covering the substrate in this invention.
[0030] Figure 10 yes Figure 9 Sectional view along the BB direction.
[0031] Figure 11 yes Figure 10 A magnified view of part C in the middle.
[0032] Figure 12 This is a schematic diagram of the structure of the experimental fixture mounted on the platform.
[0033] In the figure, 100-material tray, 110-disc body, 120-first protrusion, 130-step surface, 140-first material cavity, 200-component, 300-cover plate, 310-recessed cavity, 311-second protrusion, 320-through hole, 400-substrate, 410-enclosing assembly, 411-enclosing block, 412-second material cavity, 420-handle, 421-horizontal part, 422-vertical part, 500-stage, 510-slot. Detailed Implementation
[0034] The invention will be further illustrated below with reference to specific figures.
[0035] This invention provides a batch testing fixture for ultrasonic testing of molded components, used to transfer components 200 in batches from a tray 100 to an ultrasonic testing instrument and adaptable for mounting on the stage 500 of the ultrasonic testing instrument for ultrasonic testing. Please refer to [link to relevant documentation]. Figure 1 The tray 100 includes a tray body 110 and a first protrusion 120 protruding from the top surface of the tray body 110. A stepped surface 130 is formed between the top surface of the tray body 110 and the top surface of the first protrusion 120. The first protrusion 120 has several spaced first cavities 140 for placing components 200. (See also...) Figure 2 The mass production test fixture for ultrasonic testing of the encapsulated component 200 includes a cover plate 300 and a substrate 400. The cover plate 300 is used to close with the tray 100 to achieve the initial transfer of the component 200. Please refer to [link to relevant documentation]. Figure 3 The lower end of the cover plate 300 has several spaced-apart second protrusions 311, see [reference]. Figure 4 , Figure 5 and Figure 6 After the cover plate 300 is closed on the upper end of the tray 100, the second protrusion 311 corresponds one-to-one with the position of the first material cavity 140 to transfer the component 200 in the first material cavity 140 onto the cover plate 300. The substrate 400 is used to close with the cover plate 300 to realize the further transfer of the component 200. Please refer to [link to relevant documentation]. Figure 7 and Figure 8The substrate 400 has several second material cavities 412 at its upper end, each corresponding to a second protrusion 311. When the substrate 400 is closed with the cover plate 300, the components 200 can be transferred one by one into the second material cavities 412 and fitted onto the stage 500 for testing. Through the cooperation between the cover plate 300 and the substrate 400, a two-step batch transfer of components 200 is achieved. First, when the cover plate 300 is closed with the tray 100, the components 200 in the tray 100 are transferred to the cover plate 300 in one batch using the correspondence between the second protrusion 311 and the first material cavity 140. Second, when the substrate 400 is closed with the cover plate 300, the components 200 are transferred to the substrate 400 again in batches using the correspondence between the second protrusion 311 and the second material cavities 412. Finally, the substrate 400 can be directly fitted onto the stage 500 of the ultrasonic testing instrument, and the test is then completed in the ultrasonic testing instrument. The second protrusion 311 of the cover plate 300 corresponds one-to-one with the first material cavity 140 of the material tray 100, and the second material cavity 412 of the substrate 400 corresponds one-to-one with the second protrusion 311 of the cover plate 300. During the transfer process, the position and orientation of the components 200 are precisely defined through structural design, ensuring the uniformity of the component 200's posture. There is no need for manual adjustment of the top-view orientation and placement of the components 200, ensuring uniform posture after transfer and directly meeting the ultrasonic testing requirements for no stacking and top-view orientation. This reduces the time and error of manual intervention and the cost of manual adjustment. It eliminates the step of "placing each component 200 onto the stage 500," achieving seamless connection from "material tray 100 → fixture → testing equipment," simplifying the testing operation process and saving testing time. Furthermore, using the fixture for assisted testing eliminates the need for frequent contact between the test personnel and the components 200, reducing the occurrence of accidents such as pin damage and component loss.
[0036] Please continue reading. Figure 3The lower end face of the cover plate 300 has a recessed cavity 310 that is recessed away from the lower end face of the cover plate 300, and a plurality of second protrusions 311 are arranged in an array in the recessed cavity 310. The stepped surface 130 of the tray 100 (the transition surface between the top surface of the tray body 110 and the first protrusion 120) is adapted to the lower end face of the cover plate 300 to form a first repositioning (planar fitting limit); at the same time, the recessed cavity 310 and the first protrusion 120 of the tray 100 are fitted together to form a second repositioning (three-dimensional structure fitting). The dual positioning mechanism can strictly limit the lateral sliding and rotation of the cover plate 300 on the tray 100, ensure the precise alignment of the second protrusions 311 and the first material cavity 140, and completely solve the problem of missing, offset or stuck components 200 caused by misalignment. Because the structure of the lower end face of the cover plate 300 and the step surface 130, the recessed cavity 310 and the first protrusion 120 are structurally compatible with each other and have a "guiding" quality (similar to the interlocking logic of a jigsaw puzzle), the operator does not need to align repeatedly. He only needs to roughly align the cover plate 300 with the material tray 100 and put it down. The structure itself can guide it to the precise position, which greatly shortens the operation time of a single closing operation.
[0037] The cover plate 300 has several through holes 320 on its sidewalls that communicate with the recessed cavity 310. Preferably, the through holes 320 are located on two opposite sidewalls of the cover plate 300. The design of the two opposite through holes 320 has a pre-wetting function and prevents water from flowing in from multiple directions, reducing the generation of air bubbles. This design allows water to enter the recessed cavity 310 only from both sides of the cover plate 300, forming a relatively stable "unidirectional convection" (simultaneous and smooth injection from both sides), reducing turbulent interference from the water flow. The two opposite through holes 320 increase the total flow area of the water, and the symmetrical design makes the pressure of the water flow more even and the flow rate more gentle when it enters. The slowly injected water flow can gradually displace the air in the recessed cavity 310, allowing the air to be naturally discharged from the through holes 320, rather than being forcibly "pressed" into the cavity by the water flow to form air bubbles. Especially in the "pre-wetting" step before ultrasonic testing, the steady water flow can remove air from the dead corners of the cavity in advance, clearing obstacles for subsequent testing. The water flows smoothly along a preset path to fill the cavity, avoiding air bubbles caused by multi-directional impacts. This ensures that the water flow makes full contact with the surface of the component 200 during ultrasonic testing, reducing the impact on testing accuracy.
[0038] Please continue reading. Figure 8The upper surface of the substrate 400 is provided with a plurality of arrayed enclosure components 410. Each enclosure component 410 includes at least four enclosure blocks 411. The enclosure blocks 411 are arranged in pairs facing each other and spaced apart. There is a gap between each pair of adjacent enclosure blocks 411, which can be closed to form a second material cavity 412. The second material cavity 412 adopts a "discontinuous enclosure structure" (i.e., the enclosure blocks 411 are arranged in pairs facing each other and spaced apart, with gaps between adjacent enclosure blocks 411, and no continuous bends), which optimizes the fluid flow and air discharge path inside the cavity. The second material cavity 412 eliminates closed dead corners and avoids air bubble retention. Traditional continuously enclosed material cavities (such as a complete cavity closed on all four sides) have obvious bends and closed corners. When water is filled, the water flow is prone to forming vortices or a sudden drop in flow rate at the bends, causing air to be "trapped" and forming air bubbles, which are difficult to be discharged from the closed space. In the intermittent enclosure structure, the gaps between adjacent enclosure blocks 411 break the seal, ensuring that there are no completely sealed corners or dead zones inside the second material chamber 412. Water can flow freely through the gaps, and air inside the chamber can be smoothly discharged through the gaps with the water flow, avoiding the formation of bubbles due to "air trapping in a closed space." During ultrasonic testing, the water flow needs to fully cover the surface of the component 200 to ensure ultrasonic wave transmission. The gaps in the intermittent enclosure structure act as flow channels, allowing the water flow to circulate inside and outside the chamber. When water is injected, it can quickly fill the chamber through the gaps, while simultaneously "squeezing" air out from other gaps, reducing turbulence caused by the water flow impacting the surface of the component 200 (turbulence easily carries air and forms bubbles). During the testing process, the gaps also balance the pressure inside and outside the chamber, preventing pressure fluctuations inside the chamber due to temperature changes or equipment vibration, thereby preventing bubbles from forming or expanding due to pressure changes. The edges of molded components 200 (such as chips) are typically right angles or rounded. If the second material cavity 412 is a continuously enclosed closed structure, the component 200 may fit tightly against the cavity wall when placed in, preventing air from escaping and forming air bubbles. These tiny air bubbles between the component 200 and the cavity wall can interfere with the ultrasonic reflection signal. However, in the design of the intermittent enclosure blocks 411, the component 200 only makes partial contact with the enclosure blocks 411. The gaps between adjacent enclosure blocks 411 provide an escape channel for air, ensuring that the bottom surface of the component 200 makes full contact with the substrate 400 (or water flow), reducing the detection blind zone. The pairwise arrangement of the enclosure blocks 411 can provide stable positioning for the component 200 (such as constraints in four directions: front, back, left, and right), ensuring that the component 200 will not shift or tip over during batch transfer. At the same time, the non-enclosed gap design avoids jamming problems caused by small dimensional errors of the component 200 (for example, if the size of the enclosed cavity is slightly smaller, it is easy to jam the component 200 and squeeze out air bubbles). This structure, which combines limiting and fault tolerance, not only ensures the efficiency of batch testing but also indirectly improves the consistency of testing by reducing air bubbles.
[0039] Please see Figure 9 , Figure 10 and Figure 11 After the substrate 400 and the cover plate 300 are closed, the second protrusion 311 can partially extend into the second material cavity 412. The second protrusion 311 and the second material cavity 412 are in one-to-one correspondence, and the second protrusion 311 partially extends into the second material cavity 412, which can form a "guide positioning" function during the closing process of the cover plate 300 and the substrate 400. The second protrusion 311 is equivalent to a "positioning pin", and the second material cavity 412 is equivalent to a "positioning hole". The cooperation of the two directly constrains the relative position of the cover plate 300 and the substrate 400, ensuring that each component 200 can accurately fall from the second protrusion 311 of the cover plate 300 into the corresponding second material cavity 412 of the substrate 400, avoiding misalignment during batch transfer, such as the component 200 shifting outside the material cavity or two components 200 being squeezed into the same material cavity. For a large number of components 200 (such as dozens or even hundreds) arranged in an array, manual alignment can hardly guarantee accuracy. However, the mechanical alignment structure in which the second protrusion 311 extends into the second material cavity 412 can achieve automated and precise alignment through physical constraints.
[0040] A handle 420 is connected to each side of the substrate 400. Each handle 420 includes a horizontal portion 421 that protrudes horizontally from the sidewall of the substrate 400 in a direction away from the sidewall, and a vertical portion 422 that is perpendicularly connected to the horizontal portion 421. (See also...) Figure 12 After the substrate 400 is fixed in the slot 510 of the stage 500, the horizontal part 421 abuts against the table surface of the stage 500. The vertical part 422 extends upward perpendicular to the horizontal part 421, forming an ergonomic grip structure, allowing the operator to easily pick up and put down the substrate 400 by gripping the vertical part 422.
[0041] Both the substrate 400 and the cover plate 300 are preferably made of plexiglass (polymethyl methacrylate). Plexiglass has an acoustic impedance close to that of water, reducing signal reflection and minimizing ultrasonic wave attenuation, thus ensuring signal fidelity. Polytetrafluoroethylene (PTFE) or polyetheretherketone (PEEK) can also be used, as they have minimal interference with ultrasonic wave propagation. For higher wear resistance, anodized aluminum alloy can be selected.
[0042] A method for using a batch testing fixture for ultrasonic testing of molded components 200, applicable to the aforementioned batch testing fixture for ultrasonic testing of molded components 200. The method for using the batch testing fixture for ultrasonic testing of molded components 200 includes the following steps:
[0043] 1) Cover the cover plate 300 on top of the material tray 100, and align the second protrusion 311 with the components 200 placed in the first material cavity 140 with their top view facing out of the material tray 100. The second protrusion 311 and the components 200 are precisely positioned.
[0044] 2) Flip the cover plate 300 180°. Before flipping, the component 200 is supported by the first material cavity 140 with its top surface facing upward (towards the outside of the material tray 100). After flipping 180°, the material tray 100 is inverted above the cover plate 300. The component 200 is removed from the first material cavity 140 due to gravity and naturally falls onto the second protrusion 311 of the cover plate 300. This allows the component 200 in the first material cavity 140 of the material tray 100 to be supported on the second protrusion 311, and the top surface of the component 200 abuts against the second protrusion 311. Then, remove the material tray 100.
[0045] 3) Cover the substrate 400 on top of the cover plate 300. Before covering, the position and size of the second material cavity 412 of the substrate 400 are completely matched with the component 200 carried by the second protrusion 311. Rotate the jig 180°, and the component 200 will detach from the second protrusion 311 under the action of gravity and fall naturally into the corresponding second material cavity 412, so that the component 200 can be accommodated in the second material cavity 412 one by one, and keep the top view surface of the component 200 facing outward.
[0046] 4) Place the fixture on the stage 500, fix the substrate 400 at the corresponding position on the stage 500, remove the cover plate 300 covering the substrate 400, and start the ultrasonic testing.
[0047] 5) After the test is completed, the cover plate 300 is placed on top of the substrate 400, and the clamp is rotated 180° so that the component 200 is supported on the second protrusion 311.
[0048] 6) Remove the substrate 400, cover the tray 100 onto the cover plate 300, and then rotate the cover plate 300 180°. The components 200, after inspection, are transferred in batches to the first material cavity 140, with the top view of the components 200 facing upwards. During the transfer, the components 200 automatically return to their initial arrangement position in the tray 100 (e.g., row and column coordinates remain unchanged) through the one-to-one correspondence between the second protrusion 311 and the first material cavity 140. This orderliness facilitates subsequent traceability of defective products or allows them to directly enter the next process (e.g., sorting, packaging) without needing to be rearranged.
[0049] The above test fixtures and their usage methods are as follows: I. Achieving batch transfer and significantly improving testing efficiency. Traditional processes require manual handling and adjustment of components 200 one by one. This solution utilizes a two-step batch transfer design with a cover plate 300 and a substrate 400. By leveraging the one-to-one correspondence between the second protrusion 311 and the first and second material cavities 140 and 412, "single operation" is upgraded to "array-style synchronous transfer," allowing the transfer of dozens to hundreds of components 200 at a time, significantly shortening transfer time. The transfer process requires no manual intervention in position or orientation, eliminating repeated alignment and adjustment steps. II. Ensuring precise and uniform orientation of components 200, improving testing consistency. During the transfer from the material tray 100 to the cover plate 300 and then to the substrate 400, the engagement of the recessed cavity 310 with the first protrusion 120 and the guiding positioning of the second protrusion 311 with the second material cavity 412 force the component 200 to maintain a detection posture with its top view facing upwards. This avoids posture confusion caused by manual adjustment (such as tilting or stacking), ensuring that the relative position of the detection surface of all components 200 is consistent with the ultrasonic probe, reducing detection signal fluctuations caused by posture differences, and improving data reliability. Third, it reduces manual contact, lowering the risk of damage and loss of components 200. The fixture transfers components 200 entirely through mechanical structures. Operators only need to pick up and put down the material tray 100, cover plate 300, and substrate 400, without touching the component 200 itself. This reduces problems such as bent leads, scratches on the plastic casing, and component loss from the source (especially for components 200 with dense leads and small size). The enclosed design of the cover plate 300 and the substrate 400 (such as the recessed cavity 310 and the intermittent enclosure structure) forms a protective space during transfer and flipping, preventing the component 200 from falling off due to collision or vibration, and further reducing accidental losses. Fourth, the second material chamber 412 has an intermittent enclosure structure. Through the gaps between adjacent enclosure blocks 411, it breaks the dead corners of the traditional enclosed cavity, allowing water to smoothly fill and expel air, preventing air bubbles from being trapped between the component 200 and the cavity wall. The through holes 320 on the cover plate 300 guide the water flow smoothly, reducing the phenomenon of turbulent air entrainment, ensuring that air is orderly discharged from the through holes 320, fundamentally reducing the interference of air bubbles on the ultrasonic wave propagation path, ensuring that the detection signal truly reflects the internal structure of the component 200, and improving the accuracy of defect identification.
[0050] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structures made using the contents of the present invention specification and drawings, whether directly or indirectly applied to other related technical fields, are also within the patent protection scope of the present invention.
Claims
1. A batch testing fixture for ultrasonic testing of encapsulated components, used to transfer components in batches from a tray to an ultrasonic testing instrument and adaptable for mounting on the stage of the ultrasonic testing instrument for ultrasonic testing, the tray comprising a tray body and a first protrusion protruding from the top surface of the tray body, a stepped surface being formed between the top surface of the tray body and the top surface of the first protrusion, and a plurality of first cavities spaced apart on the first protrusion for placing components, characterized in that... Also includes: A cover plate is used to cover the tray to realize the initial transfer of components. The lower end of the cover plate has several second protrusions arranged at intervals. The lower end face of the cover plate has a recessed cavity that is recessed in a direction away from the lower end face of the cover plate. Several second protrusions are arranged in an array in the recessed cavity. Several through holes are opened on both sides of the cover plate, which are all connected to the recessed cavity and are positioned opposite each other. When the cover plate is closed on the upper end of the tray, the second protrusions are positioned one-to-one with the first material cavity to transfer the components in the first material cavity to the cover plate. as well as The substrate is used to close with the cover plate to realize the transfer of components again. The upper end of the substrate is provided with several second material cavities whose positions correspond one-to-one with the second protrusions. The upper surface of the substrate is provided with several arrayed enclosure components. Each enclosure component includes at least four enclosure blocks. The enclosure blocks are arranged in pairs opposite each other and spaced apart. There is a gap between each two adjacent enclosure blocks and they can be closed to form the second material cavity. When the substrate is closed with the cover plate, the components can be transferred one-to-one into the second material cavity and adapted to be installed on the stage for testing.
2. The mass production test fixture for ultrasonic testing of encapsulated components according to claim 1, characterized in that: The lower end face of the cover plate is adapted to the step surface.
3. The mass production test fixture for ultrasonic testing of encapsulated components according to claim 1, characterized in that: After the substrate and the cover plate are closed, the second protrusion can partially extend into the second material cavity.
4. The mass production test fixture for ultrasonic testing of encapsulated components according to claim 1, characterized in that: Each of the two sides of the substrate is connected to a handle. The handle includes a horizontal portion that protrudes horizontally from the side wall of the substrate away from the side wall of the substrate and a vertical portion that is vertically connected to the horizontal portion. When the substrate is fixed in the slot of the stage, the horizontal portion abuts against the surface of the stage.
5. The mass production test fixture for ultrasonic testing of encapsulated components according to claim 1, characterized in that: Both the substrate and the cover plate are made of plexiglass.
6. A method for using a batch testing fixture for ultrasonic testing of plastic-encapsulated components, characterized in that, The mass production test fixture for ultrasonic testing of molded components, as described in any one of claims 1-5, comprises the following steps: 1) Cover the top of the material tray with the cover plate, and align the second protrusion with the components placed in the first material cavity with their top view facing out of the material tray; 2) Flip the cover plate 180° so that the tray is upside down on the cover plate. The components in the first material cavity are supported on the second protrusion, and the top surface of the components abuts against the second protrusion. Then remove the tray. 3) Cover the substrate on top of the cover plate so that the positions of the components on the second protrusion correspond one-to-one with the positions of the second material cavity on the substrate, and rotate the clamp 180° so that the components can be accommodated one-to-one in the second material cavity, with the top view of the components facing outward. 4) Place the fixture on the stage, fix the substrate at the corresponding position on the stage, remove the cover plate covering the substrate, and start the ultrasonic testing test. 5) After the test is completed, the cover plate is placed over the substrate, and the clamp is rotated 180° so that the components are supported on the second protrusion. 6) Remove the substrate, cover the tray with the cover plate, and then rotate the cover plate 180°. After the components are inspected, they are transferred to the first material cavity in batches, with the top view of the components facing outward.