A flat series housing limiting device and a method of using the same

Abstract

The application discloses a flat series shell limiting device and a use method thereof, which comprises first, second and third layer plates arranged in sequence, a positioning column protruding towards the second layer plate is arranged on one side of the first layer plate facing the second layer plate, and positioning holes are formed on the second layer plate and the third layer plate at positions corresponding to the positioning column; a plurality of placing through grooves for allowing a ceramic square frame to move through in a vertical direction are formed on the second layer plate, the first layer plate abuts against the second layer plate, and a gap for allowing a metal lead wire to extend into the gap is formed between the second layer plate and the third layer plate. Through cooperation of the first, second and third layer plates, the shell is positioned in a horizontal direction, meanwhile, the shell inner cavity is blocked by the first layer plate to protect the bonding wire in the shell inner cavity, the bonding wire is prevented from being damaged when the shell is transported or held by an operator, and the circuit appearance is ensured, thereby providing convenience for a subsequent spot welding process.

Description

Technical Field

[0001] This invention relates to the field of ceramic packaging technology, and in particular to a flat series shell limiting device. Background Technology

[0002] Parallel seam welding is a commonly used welding process in the hermetic packaging of military integrated circuits. Its working principle and steps are as follows: the cover plate and the outer casing sealing ring are precisely aligned and placed, then spot welding is performed using electrodes to fix the cover plate and the outer casing. Finally, under the rolling discharge of the electrodes, the contact point between the cover plate and the sealing ring is continuously melted and cooled, ultimately achieving the purpose of sealing welding.

[0003] The casing seam welding process involves bonding, microscopic inspection, and spot welding. After bonding and before spot welding, the casing's inner cavity is exposed to air. This exposure increases the risk of the bonding wires being touched, potentially leading to reduced reliability or short-circuit failure after circuit packaging. Before spot welding, the casing is placed in a specific fixture, and technicians use tweezers to hold the cover plate and place it on the casing's sealing ring, visually aligning the cover plate with the sealing ring. Since most military integrated circuits require moisture and airtightness, parallel seam welding is typically performed in a high-pressure nitrogen chamber. This necessitates operators wearing gloves to handle and align the cover plate. During this alignment process, the operator needs to manually place the circuitry, exposing the casing's inner cavity throughout. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a flat series shell limiting device and its usage method to solve the problem of the shell cavity being exposed before the cover plate is welded to the shell sealing ring.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A flat series shell limiting device is provided, specifically comprising a first layer plate, a second layer plate, and a third layer plate arranged sequentially. A positioning post protruding towards the second layer plate is provided on the side of the first layer plate facing the second layer plate. Positioning holes are formed on the second and third layer plates at positions corresponding to the positioning posts, allowing the positioning posts to move through, thus enabling horizontal positioning of the first, second, and third layer plates. A plurality of placement slots are formed on the second layer plate for a ceramic frame to move through vertically. The first layer plate abuts against the second layer plate. After the ceramic frame is limited to the placement slots, a sealing ring abuts against the first layer plate so that the inner cavity of the shell is covered by the first layer plate and not exposed to air. A gap is provided between the second and third layer plates for a metal lead wire to extend into. Through the cooperation between the first, second, and third layer plates, the shell can be clamped within, restricting its movement in both the horizontal and vertical directions, thus completing the fixing and limiting of the shell.

[0006] A positioning pin protruding towards the third layer plate is provided on the side of the second layer plate facing the third layer plate. A limiting hole is formed on the third layer plate at the position corresponding to the positioning pin, so that the positioning pin can pass through and be screwed into the positioning pin. When the positioning pin passes through the limiting hole and abuts against the limiting hole, the side of the outer shell with the inner cavity can abut against the first layer plate. After the second layer plate is screwed onto the third layer plate, the metal lead of the outer shell is limited to the gap between the second layer plate and the third layer plate. Even if the first layer plate does not block the outer shell, the outer shell will not fall out of the placement slot, thus ensuring that the second layer plate and the third layer plate are positioned in the horizontal direction during the microscopic inspection and spot welding process.

[0007] The inner side of the positioning pin has a mounting hole that penetrates the second layer plate vertically. The mounting hole includes a first hole section located near the first layer plate and a first threaded hole with a diameter smaller than the first hole section located near the third layer plate, so that a stepped surface is formed at the junction of the first hole section and the second hole section. The limiting hole includes a second hole section located near the second layer plate for the positioning pin to pass through and a second threaded hole located on the side away from the second layer plate corresponding to the first threaded hole. A vertical through hole is provided on the first layer plate at the position corresponding to the first hole section, so that there is space for the placement of the metal lead wire between the second layer plate and the third layer plate. The second layer plate and the third layer plate are fixed by screwing. After the metal lead wire is located in the gap between the second layer plate and the third layer plate, it prevents the second layer plate and the third layer plate from loosening and affecting the limiting of the shell, so that the shell is always located in the placement through groove.

[0008] The positioning pins are set to four and are located at the four corners of the second layer plate. The limiting holes and through holes are set to ensure the stability of the overall structure and to ensure that the second layer plate and the third layer plate are always parallel and will not be uneven, thus preventing the shell from being unable to be restrained.

[0009] The first layer is made of transparent material. During the microscopic inspection process, the transparent first layer allows the operator to analyze the internal cavity of the shell without removing the first layer. When it is observed through the first layer that the internal cavity of the shell needs further inspection, the first layer can be removed. This can save time and trouble and improve the efficiency of the microscopic inspection process.

[0010] The positioning posts are configured as at least two and symmetrically distributed on both sides of the first layer plate. The positioning holes are correspondingly configured to prevent the second and third layers plate from deflecting relative to the first layer plate, ensuring the orderliness between the first, second, and third layers plate, and ensuring that each shell can be clamped between the first and third layers plate.

[0011] The placement slot is rectangular, and each of its four corners has a vertically extending, three-quarter circular opening connecting to the placement slot to avoid scratching the corners of the ceramic frame. On both sides of the placement slot, corresponding to the positions of the two connecting ribs of the metal lead wire, there are clearance slots connecting to the placement slot. When the outer casing is flipped over and the metal lead wire faces the first layer plate, and the first, second, and third layers plates are pressed together, the metal lead wire abuts against the first layer plate, while the sealing ring abuts against the third layer plate. Due to the gap between the second and third layers plate... The presence of the sealing ring on one side of the ceramic frame extends through the placement slot into the gap between the second and third layers. The corresponding metal lead is then squeezed by the first layer towards the second layer. Since the length and width of the metal lead are greater than those of the ceramic frame, the metal lead cannot be deformed by the placement slot. The connecting rib is a very important structure of the shell. To prevent the connecting rib from being deformed and damaged by the first layer, the connecting rib clearance slot allows the connecting rib to extend into it when the first layer squeezes the metal lead, thus preventing the connecting rib from being squeezed and ensuring its integrity.

[0012] A first notch is formed on at least one side of the second layer plate, and a second notch is formed on at least two sides of the third layer plate, thereby facilitating the separation of the first layer plate, the second layer plate, and the third layer plate.

[0013] It also includes a rectangular frame located on the side of the first layer away from the second layer. A tightening part is coaxially and movably disposed on the rectangular frame corresponding to each through hole. The tightening part can rotate freely relative to the rectangular frame along its own central axis, and one end of the tightening part movably passes through the through hole and can move along its axial direction. By rotating the tightening part, screws can be screwed into the first and second threaded holes, facilitating the connection between the second and third layers. The connection can be completed without carrying or finding additional tools, making it not only convenient and simple to use but also saving time in the entire processing procedure. The rectangular frame is also provided with a limiting part that can move horizontally. When the rectangular frame abuts against the first layer, the limiting part abuts against the side of the third layer facing away from the second layer to restrict the first layer onto the second layer.

[0014] The present invention also provides a method for using a flat series shell limiting device, comprising the following steps:

[0015] S1. Place the first layer plate at the bottom with the positioning pin facing upwards, place the second layer plate above the first layer plate and pass the positioning pin through the positioning hole of the second layer plate until the second layer plate abuts against the first layer plate, place the bonded shell with the sealing ring and inner cavity facing downwards into the placement slot so that the sealing ring abuts against the first layer plate, and the placement slot restricts the shell from moving in the horizontal direction.

[0016] S2. After placing the outer shell in each placement slot, place the third layer plate above the second layer plate and make the positioning pin pass through the positioning hole on the third layer plate. At this time, the positioning pin is collinear with the center of the limiting hole and passes through the limiting hole until the end face of the positioning pin abuts against the inner wall of the limiting hole. At this time, the metal lead wire is located in the gap between the third layer plate and the second layer plate.

[0017] S3. Flip over the stacked first, second, and third layers, place screws on the tightening part, place the rectangular frame above the first layer and align the tightening part with the corresponding through hole, then let the rectangular frame abut against the first layer. At this time, the tightening part and the screw on the tightening part pass through the through hole and extend into the first hole section. By rotating the tightening part, the screw is screwed into the first threaded hole and the second threaded hole. Move the limiting part so that the limiting part abuts against the third layer, thereby restricting the vertical movement of the stacked first, second, and third layers. At this time, the distance between the first and third layers is consistent with the thickness of the outer shell, and the sealing ring abuts against the first layer.

[0018] S4. The first, second, and third laminated plates are sequentially transported to the microscopic inspection and spot welding processes, with the first plate facing upwards. The limiting part is moved and the rectangular frame is removed. The first plate is then removed for the microscopic inspection and spot welding processes.

[0019] Using the above method, the outer shell can be confined within the placement slot, and the outer shell is pressed between the first and third layers. The inner cavity of the outer shell is blocked during transportation to prevent damage to the bonding wires. The inner cavity of the outer shell can be inspected while ensuring its safety during microscopic examination. The first layer can be easily removed only when further inspection of the inner cavity is required. Overall, it is convenient to use.

[0020] The flat series housing limiting device and its usage method of the present invention have at least the following beneficial effects: through the cooperative use of the first layer plate, the second layer plate and the third layer plate, while positioning the housing in the horizontal direction, the inner cavity of the housing is blocked by the first layer plate to protect the bonding wires of the inner cavity of the housing, avoiding damage to the bonding wires when the housing is transported or handled by the operator, ensuring the appearance of the circuit, and providing convenience for the subsequent spot welding process. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 A perspective view of an existing flat series shell;

[0023] Figure 2 This is a perspective view of the limiting device of the present invention;

[0024] Figure 3 This is an exploded view of the limiting device of the present invention;

[0025] Figure 4 A top view of the first, second, and third layers of the present invention assembled with the outer casing and the metal leads facing the first layer.

[0026] Figure 5 For the present invention along Figure 4 A sectional view cut along the AA direction;

[0027] Figure 6 This is a top view of the second layer plate of the present invention;

[0028] Figure 7 For the present invention along Figure 6 A sectional view cut along the BB direction;

[0029] Figure 8 A front view of the first, second, and third layer plates of the present invention assembled with the outer shell and the sealing ring facing the first layer plate;

[0030] Figure 9 This is a front cross-sectional view of the rectangular frame and the tightening part of the present invention;

[0031] Figure 10 This is a top cross-sectional view of the rectangular frame and the limiting part of the present invention.

[0032] The meanings of the labels in the attached diagram are as follows:

[0033] Casing-1; Ceramic frame-11; Sealing ring-12; Metal lead wire-13; Connecting rib-14;

[0034] First layer plate-2; Positioning post-21; Perforation-22;

[0035] Second layer plate-3; positioning hole-31; placement through groove-32; opening-321; clearance through groove-322; positioning pin-33; first hole section-331; first threaded hole-332; first notch-34;

[0036] Third layer plate-4; Positioning hole-41; Limiting hole-42; Second hole section-421; Second threaded hole-422; Second notch-43;

[0037] Rectangle -5;

[0038] Tightening part - 6; Rotating hole - 61; Third hole section - 611; Fourth hole section - 612; Fifth hole section - 613; Nail taper - 62; Knob - 621; Taper rod - 622; Limiting ring - 623; Elastic element - 63; Drill bit - 64;

[0039] Limiting part-7; connecting block-71; sliding hole-711; stop bar-72; limiting structure-73; pry bar-731; second compression spring-732; meshing tooth-734. Detailed Implementation

[0040] The invention will now be further described with reference to the accompanying drawings.

[0041] Reference Figure 1This is one type of flat series shell 1 in the prior art, and is the type of shell 1 used in this invention. This shell 1 includes a rectangular ceramic frame 11, a sealing ring 12 disposed on one side of the ceramic frame 11, and a metal lead wire 13 disposed on the side of the ceramic frame 11 opposite to the sealing ring 12. The sealing ring 12 has a rectangular frame structure, and the metal lead wire 13 has an outer frame with a rectangular frame structure. On the side where the length of the outer frame is located, there are several ribs extending toward the ceramic frame 11. The end of the ribs near the ceramic frame 11 is inclined from the side away from the ceramic frame 11 to the side near the ceramic frame 11 and connected to the ceramic frame 11. On the side where the width of the outer frame of the ceramic frame 11 is located, there is a connecting rib 14 extending toward the ceramic frame 11. The end of the connecting rib 14 near the ceramic frame 11 is inclined from the side away from the ceramic frame 11 to the side near the ceramic frame 11 and connected to the ceramic frame 11. A groove is formed on the ceramic frame 11 and inside the sealing ring 12, and the inner cavity of the groove is the circuit cavity.

[0042] Reference Figures 2 to 10 As shown, the flat series shell 1 limiting device of the present invention includes a first layer plate 2, a second layer plate 3, a third layer plate 4, a rectangular frame 5, a tightening part 6 movably disposed on the rectangular frame 5, and a limiting part 7 disposed on the rectangular frame 5 and capable of moving in the horizontal direction. The rectangular frame 5, the first layer plate 2, the second layer plate 3, and the third layer plate are arranged sequentially and parallel to each other. A positioning post 21 protruding towards the second layer plate 3 is provided on the side of the first layer plate 2 facing the second layer plate 3. Positioning holes 31 and 41 are respectively formed on the second layer plate 3 and the third layer plate 4 at positions corresponding to the positioning post 21 for the positioning post 21 to move through. After the first layer plate 2, the second layer plate 3, and the third layer plate 4 are stacked, the positioning post 21 and the positioning holes 31 and 41 are used to achieve the vertical positioning and installation of the first layer plate 2, the second layer plate 3, and the third layer plate 4, thereby achieving the horizontal positioning of the first layer plate 2, the second layer plate 3, and the third layer plate 4. The second layer plate 3 has several placement slots 32 for the ceramic frame 11 to move vertically through. The first layer plate 2 and the second layer plate 3 can move vertically relative to each other. After the ceramic frame 11 is confined in the placement slots 32, the sealing ring 12 abuts against the first layer plate 2. There is a gap between the second layer plate 3 and the third layer plate 4 for the metal lead 13 to extend into. The gap restricts the metal lead 13, whose length and width are significantly larger than the length and width of the ceramic frame 11, so that the outer shell 1 cannot be separated from the second layer plate 3 to achieve vertical positioning of the outer shell 1. The placement slots 32 position the outer shell 1 horizontally, thus enabling positioning of the outer shell 1 from various directions. The first layer plate 2 can abut against the sealing ring 12 after the outer shell 1 is confined in the placement slots 32, thereby blocking the circuit cavity and preventing the circuit cavity from being exposed to the air and increasing the possibility of damage.

[0043] In this embodiment, the first layer 2, the second layer 3, and the third layer 4 are all rectangular sheet structures. The thickness of the first layer 2 is 2mm. The first layer 2 is made of a transparent material, preferably plexiglass. In this way, while the sealing ring 12 is pressed against the first layer 2 to block the circuit cavity, the transparent material of the first layer 2 allows the operator to observe the condition inside the circuit cavity at any time. Especially during the microscopic inspection process, a dedicated microscopist will inspect the circuit cavity. The transparent first layer 2 allows the microscopist to see the bonding wires inside the circuit cavity directly, and does not affect the microscopist's use of a magnifying glass to observe the circuit cavity. The first layer 2 can be removed when further action is needed on the circuit cavity, which can save time for the microscopic inspection process while protecting the circuit cavity. The positioning posts 21 are set to at least two and symmetrically distributed on both sides of the first layer plate 2. The positioning holes 31 and 41 on the second layer plate 3 and the third layer plate 4 are correspondingly set to the positioning posts 21. The two positioning posts 21 can basically maintain the horizontal positioning of the first layer plate 2, the second layer plate 3 and the third layer plate 4. In this embodiment, four cylindrical positioning posts 21 are provided on the side of the first layer plate 2 facing the second layer plate 3. The four positioning posts 21 are symmetrically arranged in pairs on both sides of the first layer plate 2 near the width and are arranged vertically in the axial direction. On the second layer plate 3 and the third layer plate 4, four positioning holes 31 and 41 are formed vertically through the four positioning posts 21 at their corresponding positions, so that the four positioning posts 21 can be aligned with the four positioning holes 31 on the second layer plate 3 and the four positioning holes 41 on the third layer plate 4. This allows for quick alignment of the first layer plate 2, the second layer plate 3, and the third layer plate 4, and restricts the horizontal movement of the first layer plate 2, the second layer plate 3, and the third layer plate 4 when the positioning posts 21 are moved through the corresponding positioning holes 31 and 41. The positioning holes 31 and 41 are circular and their diameter is slightly larger than that of the positioning post 21, so that the positioning post 21 can pass freely through the positioning holes 31 and 41. The diameter difference between the positioning holes 31 and 41 and the positioning post 21 is between 0 and 1 mm. While ensuring that the positioning post 21 can move through the positioning holes 31 and 41, the range of horizontal movement between the first layer plate 2, the second layer plate 3 and the third layer plate 4 is small, thereby basically achieving horizontal positioning.

[0044] Reference Figure 6As shown, the second layer plate 3 is preferably made of stainless steel, which is sturdy and durable. The outer surface of the second layer plate 3 undergoes a black surface treatment process, specifically a black zinc plating process, to distinguish the color of the second layer plate 3 from that of the outer shell 1. This black zinc plating ensures that the light emitted during the CCD (Charge-Coupled Device, a semiconductor device that converts optical images into digital signals) recognition process differs from the light emitted by the outer shell 1 during the recognition process, thereby improving the recognition accuracy of the recognition device for the outer shell 1. The thickness of the second layer plate 3 is 1.5 mm.

[0045] Several placement slots 32 are arranged in a rectangular array and evenly distributed on the second layer plate 3, with at least two placement slots 32. The placement slots 32 are rectangular and extend vertically through the second layer plate 3. The length and width of the placement slots 32 are slightly larger than the length and width of the ceramic frame 11, that is, the distance difference between the length and width of the ceramic frame 11 and the length and width of the placement slots 32 is 0-1mm, so that the ceramic frame 11 can freely pass through the placement slots 32, and the placement slots 32 can achieve the horizontal positioning of the ceramic frame 11. Preferably, each of the four corners of the placement groove 32 is vertically connected to form a three-quarters circular opening 321. When the ceramic frame 11 is inserted into the placement groove 32, the four corners of the ceramic frame 11 are exactly located within the four openings 321. Due to some errors in some ceramic frames 11, the corners of the ceramic frames 11 may be uneven. The openings 321 can prevent the inner wall of the placement groove 32 from scratching the corners of the ceramic frames 11.

[0046] Reference Figure 4 and Figure 5 As shown, in this embodiment, a clearance slot 322 is provided at the position of the two connecting ribs 14 of the metal lead 13 corresponding to the placement slot 32. The clearance slot 322 is used to allow the connecting ribs 14 to move through it when the metal lead 13 faces the first layer plate 2, thereby protecting the connecting ribs 14.

[0047] Reference Figure 8As shown, linear clearance slots 322 are formed by horizontally extending along the length of the placement slot 32 on both sides where the width of the placement slot 32 is located. The two clearance slots 322 penetrate the second layer plate 3 vertically and are connected to the placement slot 32 respectively. The length of the clearance slot 322 is greater than the length of the connecting rib 14, and the width of the clearance slot 322 is greater than the width of the connecting rib 14 so that the connecting rib 14 can move into the clearance slot 322. During some processing of the outer casing 1, especially during the bonding process, the metal lead 13 needs to be operated facing the first layer plate 2. At this time, in order to position the outer casing 1, the metal lead 13 needs to face the first layer plate 2, while the sealing ring 12 faces the third layer plate 4. The ceramic frame 11 and the sealing ring 12 can easily pass through the placement groove 32 and extend into the gap between the second layer plate 3 and the third layer plate 4. Since the metal lead 13 is not flat, in order to ensure that the outer casing 1 is pressed tightly against the third layer plate 4, the first layer plate 2 needs to be pressed towards the second layer plate 3. During this process, the metal lead 13 will deform and tend to flatten. The connecting rib 14 is relatively thin and is easily damaged after pressing and deformation. The clearance groove 322 can extend into it during the pressing of the metal lead 13 to avoid being squeezed, thereby protecting the connecting rib 14, preventing the connecting rib 14 from being damaged, and also ensuring the flatness of the outer casing 1 in the horizontal direction. Preferably, a first notch 34 is formed on at least one side of the second layer plate 3. The first notch 34 extends through the second layer plate 3 in the vertical direction and in the direction away from the second layer plate 3. When the first layer plate 2 is pressed against the second layer plate 3 for a long time, the first layer plate 2, which is made of plexiglass, is easily stuck to the second layer plate 3 and is difficult to separate. However, the first notch 34 can push the first layer plate 2 toward the side away from the second layer plate 3 when it is necessary to separate the first layer plate 2 and the second layer plate 3, so that they can be separated more conveniently and effectively, simplifying the operation process.

[0048] In this embodiment, a positioning pin 33 protruding towards the third layer plate 4 is provided on the side of the second layer plate 3 facing the third layer plate 4. A limiting hole 42 is formed on the third layer plate 4 at the position corresponding to the positioning pin 33, through which the positioning pin 33 passes. The limiting hole 42 and the positioning pin 33 can be engaged in a movable insertion fit and also screwed fit to position the second layer plate 3 and the third layer plate 4. When the positioning pin 33 passes through the limiting hole 42 and abuts against the limiting hole 42, the side of the outer shell 1 with the inner cavity can abut against the first layer plate 2, so that the first layer plate 2, the second layer plate 3 and the third layer plate 4 cooperate with each other to position and limit the outer shell 1.

[0049] Reference Figure 6 and Figure 7As shown in this embodiment, the inner side of the positioning pin 33 has a mounting hole that penetrates the second layer plate 3 vertically. The mounting hole includes a first hole segment 331 located near the first layer plate 2 and a first threaded hole 332 located near the third layer plate 4 with a diameter smaller than the first hole segment 331, so that a stepped surface is formed at the junction of the first hole segment 331 and the first threaded hole 332. By machining a screw, the head of the screw is located in the first hole segment 331, while the threaded rod segment engages with the first threaded hole 332, and the head abuts against the stepped surface to restrict the screw from moving further into the first threaded hole 332. The limiting hole 42 includes a second hole segment 421 located near the second layer plate 3 for the positioning pin 33 to pass through, and a second threaded hole 422 located on the side away from the second layer plate 3 corresponding to the first threaded hole 332. A stepped surface is also formed at the junction of the second hole segment 421 and the second threaded hole 422. The positioning pin 33 passes into the second hole segment 421 and... The metal lead 13 rests against the stepped surface of the limiting hole 42. At this time, the second layer plate 3 and the third layer plate 4 have a gap for the metal lead 13 to stay in. The spacing of the gap is greater than the thickness of the metal lead 13 in the vertical direction to leave enough space for the metal lead 13. When the metal lead 13 of the housing 1 is placed in the gap and the ceramic square frame 11 is inserted into the placement slot 32, the screw is machined in and its head rests against the stepped surface in the positioning pin 33. At this time, the shank of the screw is screwed into the first threaded hole 332 and the second threaded hole 422 in sequence to position the second layer plate 3 and the third layer plate 4. The housing 1 is then limited to the second layer plate 3 and the third layer plate 4. The positional relationship between the housing 1, the second layer plate 3 and the third layer plate 4 can be kept consistent without the use of other fixtures. This avoids the effect of microscopic inspection or spot welding due to the unstable position between the second layer plate 3 and the third layer plate 4 during microscopic inspection or spot welding. It also saves the use of other fixtures and saves electricity and cost to a certain extent. Preferably, a vertical through hole 22 is provided on the first layer plate 2 at the position corresponding to the first hole segment 331. In this way, after the first layer plate 2, the second layer plate 3, and the third layer plate 4 are stacked, the screw can be machined into the first threaded hole 332 and the second threaded hole 422 through the through hole 22, so as not to affect the screw insertion. Compared with the method that requires the first layer plate 2 to be removed before the screw can be machined, the through hole 22 allows the operator to machine the screw into the first threaded hole 332 and the second threaded hole 422 regardless of whether the first layer plate 2 is stacked on the second layer plate 3. This reduces the trouble for the operator and increases the flexibility of the structure of this application.

[0050] Specifically, four positioning pins 33 are set at the four corners of the second layer plate 3, and corresponding limiting holes 42 and through holes 22 are set. That is, four through holes 22 and limiting holes 42 are respectively set at the four corners of the four positioning pins 33 on the first layer plate 2 and the third layer plate 4. After the second layer plate 3 and the third layer plate 4 are fixed by screws, the second layer plate 3 and the third layer plate 4 will not tilt no matter which direction they are pressed. Compared with setting one, two or three positioning pins 33, setting one, two or three would make it easy for the second layer plate 3 and the third layer plate 4 to tilt when pressing the edge, which would make the second layer plate 3 and the third layer plate 4 not parallel. However, setting four and setting them at the four corners will prevent the second layer plate 3 and the third layer plate 4 from tilting no matter which direction they are pressed, ensuring that the second layer plate 3 and the third layer plate 4 are always parallel. Preferably, the positioning pin 33 and the positioning post 21 are of the same length, so that there is a gap between the second layer plate 3 and the third layer plate 4, and after the first layer plate 2, the second layer plate 3 and the third layer plate 4 are stacked, the positioning post 21 will not extend out of the positioning hole 31 41 and extend outside the third layer plate 4, so that the overall structure after stacking remains flat.

[0051] The third layer 4 is made of aluminum alloy and its outer surface undergoes an oxidation blackening process, specifically an oxidation sandblasting blackening process. This achieves the same function as the second layer 3, making it easily distinguishable from the outer casing 1. Furthermore, the third layer 4 can block the circuit cavity when the circuit cavity of the outer casing 1 faces the third layer 4, thus protecting the circuit cavity in conjunction with the first layer 2. This prevents damage to the bonding wires in the circuit cavity due to human error during transfer or spot welding operations, thereby improving the reliability of the circuit package. The thickness of the third layer 4 is 2mm, and the thicknesses of the first layer 2, second layer 3, and third layer 4 are specifically adapted to the thickness of the outer casing 1. Second notches 43 are formed on at least two sides of the third layer plate 4. In the present embodiment, second notches 43 are symmetrically formed on all four sides of the third layer plate 4. The second notches 43 facilitate the separation of the second layer plate 3 and the third layer plate 4. At least one side of the second layer plate 3 does not have a first notch 34, thereby avoiding the first notch 34 and the second notch 43 on each side from always overlapping and being unable to be easily separated, or making the first notch 34 and the second notch 43 on the same side staggered to achieve the same effect.

[0052] The rectangular frame 5 has a rectangular frame structure and is located on the side of the first layer 2 away from the second layer 3. The length and width of the rectangular frame 5 are the same as the length and width of the second layer 3. The tightening part 6 is provided at the position corresponding to each through hole 22 and is collinear with the center of the corresponding through hole 22. The tightening part 6 can rotate freely relative to the rectangular frame 5 along its own central axis, and one end of the tightening part 6 is movably inserted through the through hole 22 and can move along its axial direction. By rotating the tightening part 6, the screw can be screwed into the first threaded hole 332 and the second threaded hole 422, thereby completing the installation of the screw and fixing the second layer 3 and the third layer 4.

[0053] Reference Figure 2 , Figure 3 and Figure 9 As shown, four tightening parts 6 are provided and located at the four corners of the rectangular frame 5. Each tightening part 6 includes a rotating hole 61 corresponding to the through hole 22 and arranged collinearly with the center; a nail cone 62 rotatably disposed in the rotating hole 61 for holding and turning the screw; and an elastic member 63 disposed in the rotating hole 61 and pressing the nail cone 62. The rotating hole 61 is collinear with the center of the through hole 22. The nail cone 62 can rotate freely relative to the rotating hole 61 along its central axis and can slide vertically relative to the rotating hole 61. The elastic member 63 is made of elastic material so that it can deform under external force and automatically return to its original shape after the external force is removed. Specifically, the rotating hole 61, from the side facing away from the first layer plate 2 to the side facing the first layer plate 2, has a third hole segment 611, a fourth hole segment 612 with a diameter larger than the third hole segment 611, and a fifth hole segment 613 with a diameter equal to the third hole segment 611. The third hole segment 611, the fourth hole segment 612, and the fifth hole segment 613 are sequentially connected and collinear. The third hole segment 611 and the fifth hole segment 613 are respectively connected to the outside of the rectangular frame 5. The nail awl 62, from the side facing away from the first layer plate 2 to the side facing the first layer plate 2, has a knob 621 located outside the rectangular frame 5 with a diameter larger than the third hole segment 611, a conical rod 622 movably inserted into the third hole segment 611, and a limiting ring 623 protruding horizontally in a square shape around the outer wall of the conical rod 622. The knob 621 is plate-shaped or like a... Figure 3The fan-shaped knob 621 is designed for easy rotation and is approximately 2 cm high. One end of the tapered rod 622 extends outwards towards the side facing away from the first layer 2, forming a third hole section 611 and connecting to the knob 621. The other end of the tapered rod 622 extends outwards towards the side facing the first layer 2, forming a fifth hole section 613. A drill bit 64 is formed on the end of the tapered rod 622 extending outwards towards the first layer 2 for engaging with the screw head. The maximum diameter of the drill bit 64 is equal to or less than the diameter of the tapered rod 622. The tapered rod 622 is made of a magnet capable of attracting metal to hold the screw. A retaining ring 623 is movably disposed within the fourth hole section 612, and the vertical length of the retaining ring 623 is less than the vertical length of the fourth hole section 612, allowing the retaining ring 623 to move vertically within the fourth hole section 612. The diameter of the retaining ring 623 is greater than the diameter of the third hole section 611. The elastic element 63 is disposed within the fourth hole segment 612 and abuts against the end face of the limiting ring 623 facing the fifth hole segment 613. The elastic element 63 can be a metal spring or a first compression spring sleeved vertically on the tapered rod 622. The first compression spring of the elastic element 63 is located on the side of the limiting ring 623 facing the fifth hole segment 613. Without external force, one end of the metal spring or the first compression spring presses the limiting ring 623 toward the side away from the first layer plate 2, causing it to abut against the side face of the fourth hole segment 612 near the third hole segment 611. When the metal lead 13 of the outer casing 1 is located between the second layer plate 3 and the third layer plate 4, and the ceramic frame 11 is located in the placement slot 32 until all placement slots 32 are filled with the outer casing 1, in order to fix the second layer plate 3 and the third layer plate 4 to position the outer casing 1, firstly, the rectangular frame 5, the first layer plate 2, the second layer plate 3, and the third layer plate 4 are placed in order from top to bottom, and the four screws are magnetically attracted to each drill bit 64 with the screw tips facing down. The conical rod 622 attracts the screws, allowing the operation of all four screws at the same time, saving the trouble of operating each one individually; then, the entire rectangular frame 5 is moved downwards and the four screws are aligned with the corresponding through holes 22, and then... Move the screws into the through hole 22 until all screws abut against the first threaded hole 332. At this point, press down and rotate the knob 621 to move the tapered rod 622 vertically toward the first layer plate 2, thereby gradually turning the screws into the first threaded hole 332 and the second threaded hole 422 until the screw head abuts against the stepped surface inside the locating pin 33. During the screw turning process, the limiting ring 623 gradually compresses the elastic element 63. After the screw installation is completed and the external force is released, the elastic element 63 compresses the limiting ring 623 vertically toward the side away from the first layer plate 2 to return the tapered rod 622 to its initial position. Other screws can be installed in the same way. It should be noted that when installing screws, only one screw can be magnetically attached to the corresponding drill bit 64 for one-by-one operation, not limited to the usage method shown in this embodiment.The structure of this embodiment is not only simple to operate, but also significantly more convenient than using a screwdriver to install screws. Screwdrivers require a certain height to operate, which is inconvenient in narrow spaces. Even when using an L-shaped screwdriver, it requires a relatively large horizontal space for the end furthest from the drill bit 64 to rotate, limiting its usable space. However, the workbench for machining the outer casing 1 has limited space, making it time-consuming to move to a wider area. Furthermore, when screws need to be machined, a screwdriver must be carried or found, which is inconvenient. The structure of this embodiment can be transported together with the first layer 2, second layer 3, and third layer 4 without affecting microscopic inspection and other processes. It allows screw machining in a small space, requiring less vertical and horizontal space, and can operate in a low and narrow space, avoiding limitations.

[0054] The limiting part 7 is detachably mounted on the rectangular frame 5. It is installed on the rectangular frame 5 when it is necessary to fix the first layer plate 2, the second layer plate 3, and the third layer plate 4, and can be removed when not needed. There are two limiting parts 7, which are respectively located on opposite sides of the rectangular frame 5. They can be located on the two sides where the length of the rectangular frame 5 is located, or they can be located on the two sides where the width of the rectangular frame 5 is located, respectively on the two opposite sides of the rectangular frame 5.

[0055] Reference Figure 3 or Figure 10As shown, two limiting parts 7 are respectively disposed on the two sides of the width of the rectangular frame 5. The limiting part 7 includes a connecting block 71 screwed onto the rectangular frame 5, a stop bar 72 slidably disposed on the connecting block 71 in the horizontal direction and in a direction parallel to the length of the rectangular frame 5, and a limiting structure 73 for the stop bar 72 to extend horizontally to the inside of the rectangular frame 5. The end of the connecting block 71 facing the first layer plate 2 extends towards the first layer plate 2, and the stop bar 72 is located on the side of the rectangular frame 5 close to the first layer plate 2. The limiting structure 73 is disposed on the connecting block 71. When the first layer plate 2, the second layer plate 3, and the third layer plate 4 are stacked, the stop bar 72 can be pushed to extend to the bottom of the third layer plate 4 and abut against the third layer plate 4 to fix the first layer plate 2, the second layer plate 3, and the third layer plate 4 to each other. Specifically, a sliding hole 711 is provided on the connecting block 71 along the length of the rectangular frame 5 for the stop bar 72 to move through. The stop bar 72 slides through the sliding hole 711 with both ends protruding outside the sliding hole 711. The sliding hole 711 includes ports at both ends and a sliding section between the two ports. The width of the sliding section is greater than the width of the port facing outwards, and the width of the port facing outwards is greater than the width of the stop bar 72. The stop bar 72 is rectangular in shape. The limiting structure 73 includes a pry bar 731 hinged in the sliding section and capable of swinging in opposite directions at both ends, and a second compression spring 732 sleeved on the stop bar 72 and located in the sliding section. The second compression spring 732 is arranged along the length of the stop bar 72. A protrusion is provided on the inner wall of the sliding section on the side of the pry bar 731 facing outward, so that a compression space is formed between the outward-facing port and the protrusion. The second compression spring 732 is located in the compression space. The end of the second compression spring 732 near the outside is fixedly connected to the stop bar 72, and the end of the second compression spring 732 near the protrusion abuts against the protrusion. A meshing groove is provided on the side of the stop bar 72 facing the pry bar 731, and a meshing tooth 733 is provided on the end of the pry bar 731 near the meshing groove to mesh with the meshing tooth 733. A pressing rod is hinged to the end of the pry bar 731 away from the meshing tooth 733, and an opening 321 (not shown in the figure) is provided on the connecting block 71 for the pressing rod to move out of the connecting block 71. The distance between the stop bar 72 and the rectangular frame 5 is equal to the thickness between the first layer plate 2, the second layer plate 3, and the third layer plate 4 after the outer shell 1 is installed and stacked.When the first layer plate 2, the second layer plate 3, and the third layer plate 4 are stacked, and the rectangular frame 5 is located on the side of the first layer plate 2 facing away from the second layer plate 3, the inward-facing end of the stop bar 72 is located in the sliding hole 711. When it is necessary to fix the first layer plate 2, the second layer plate 3, and the third layer plate 4 together, the stop bar 72 is pushed inward, causing the inward-facing end of the stop bar 72 to move towards the third layer plate 4. During the movement, the meshing tooth 733 is located above the stop bar 72 and moves against the stop bar 72. The second compression spring 732 is compressed and contracted. When the meshing groove moves to below the meshing tooth 733, the meshing tooth 733 moves towards the meshing groove under gravity until it engages with the meshing groove, thereby restricting the movement of the stop bar 72. At this time, the end of the baffle 72 facing inward abuts against the third layer plate 4 to fix the first layer plate 2, the second layer plate 3 and the third layer plate 4 together, thereby ensuring the positioning of the outer shell 1 in the horizontal and vertical directions. When it is necessary to separate the first layer plate 2, the pressing rod is pressed to make the pressing rod pry the pry bar 731 swing and make the meshing teeth 733 disengage from the meshing groove. After the meshing teeth 733 are completely disengaged from the meshing groove, the second compression spring 732 extends and squeezes the baffle 72, so that the baffle 72 moves quickly outward and no longer abuts against the third layer plate 4. This embodiment is not only convenient to use, but also ingenious in structure. When it is necessary to separate the first layer plate 2, it can be done by pressing, which is convenient and portable.

[0056] The method of using the flat series shell 1 limiting device of the present invention includes the following steps:

[0057] S1. Place the first layer plate 2 at the bottom with the positioning post 21 facing upwards, place the second layer plate 3 above the first layer plate 2 and make the positioning post 21 pass through the positioning hole 31 of the second layer plate 3 until the second layer plate 3 abuts against the first layer plate 2, and place the bonded shell 1 with the sealing ring 12 and the inner cavity facing downwards into the placement groove 32 so that the sealing ring 12 abuts against the first layer plate 2, and the placement groove 32 restricts the shell 1 from moving in the horizontal direction;

[0058] S2. After placing the outer shell 1 in each placement slot 32, place the third layer plate 4 above the second layer plate 3 and make the positioning pin 21 pass through the positioning hole 41 on the third layer plate 4. At this time, the positioning pin 33 is collinear with the center of the limiting hole 42 and passes through the limiting hole 42 until the end face of the positioning pin 33 abuts against the inner wall of the limiting hole 42. At this time, the metal lead wire 13 is located in the gap between the third layer plate 4 and the second layer plate 3.

[0059] S3. Flip over the stacked first layer 2, second layer 3 and third layer 4, place screws on the tightening part 6, place the rectangular frame 5 above the first layer 2 and align the tightening part 6 with the corresponding through hole 22 and then let the rectangular frame 5 abut against the first layer 2. At this time, the tightening part 6 and the screw on the tightening part 6 pass through the through hole 22 and extend into the first hole section 331. By rotating the tightening part 6, the screws are screwed into the first threaded hole 332 and the second threaded hole 422. Move the limiting part 7 so that the limiting part 7 abuts against the third layer 4, thereby restricting the vertical movement of the stacked first layer 2, second layer 3 and third layer 4. At this time, the distance between the first layer 2 and the third layer 4 is consistent with the thickness of the outer shell 1, and the sealing ring 12 abuts against the first layer 2.

[0060] S4. The first layer plate 2, the second layer plate 3 and the third layer plate 4 after being stacked are sequentially transported to the microscopic inspection process and the spot welding process, and the first layer plate 2 is facing upward. The limiting part 7 is moved and the rectangular frame 5 is removed. The first layer plate 2 is removed to perform the microscopic inspection process and the spot welding process.

[0061] Using the above method, the sealing ring 12 of the outer shell 1 faces the first layer plate 2 to avoid exposing the circuit cavity to air and causing potential hazards. After the outer shell 1 is confined within the first layer plate 2, the second layer plate 3, and the third layer plate 4, the batch transfer of the outer shell 1 is achieved. In the microscopic inspection process, the operator flips the overall structure so that the first layer plate 2 faces upwards and is directly facing the operator. The operator can remove the first layer plate 2 as needed to inspect the circuit cavity. After the inspection is qualified, the first layer plate 2 is replaced, and then the structure is transferred to the spot welding process. The spot welding process involves welding the cover plate onto the outer shell 1. In the spot welding process, the operator places the entire structure in the working position of the equipment, removes the first layer plate 2, and begins the spot welding operation. The equipment automatically picks up and identifies the cover plate, and automatically identifies, aligns, and spots welds the outer shell 1, ultimately completing the batch spot welding. The positioning pin 33 and the positioning post 21 ultimately achieve the horizontal positioning of the three-layer fixture. The outer shell 1 is positioned and fixed between the first layer plate 2 and the third layer plate 4 by the second layer plate 3. This combined design maximizes the physical isolation between the circuit cavity and the outside environment during batch circuit transfer, preventing contamination from foreign objects or unintentional contact by personnel. After the circuit bonding is completed, it is transferred to the microscopic inspection process via the overall structure. Because the overall structure sandwiches the outer shell 1 between the first layer board 2 and the third layer board 4, it can be flipped over completely, preventing unintentional contact with the circuit cavity by operators during the flipping process. After the combined fixture is flipped over, the outer shell 1 cavity faces upwards, directly towards the operator. During the inspection stage, depending on the inspection requirements, it is decided whether to remove the first layer board 2 for microscopic inspection of the circuit's interior. After inspection, the first layer board 2 is repositioned using positioning pins 33 and the positioning holes 31 and 41 of the second and third layers board 3 and 4. When the inspection is complete and spot welding is required, the entire structure is placed upright in the spot welding tray. During this process, the overall structure still sandwiches the outer shell 1 in the middle, thus preventing unintentional damage to the circuit's internal cavity by personnel during transfer and placement, which could lead to circuit failure. After the entire structure is placed upright on the spot welding tray, carefully remove the first layer board 2. At this point, the equipment program can be started to begin automatic spot welding. During the spot welding process, the equipment uses a robotic arm to pick up and identify the cover plate and the outer shell 1. After visual alignment, the cover plate and outer shell 1 are matched and placed together. Then, electrodes are used to discharge at the set positions to spot weld the cover plate and outer shell 1 together. The second layer board 3 and the third layer board 4 have undergone a blackening process to ensure visual accuracy and guarantee the accurate positioning of the cover plate and outer shell 1. The robotic arm's automatic picking and placing function replaces the manual handling of the cover plate, visual alignment, and manual placement by operators. This avoids misalignment or damage to the internal bonding wires during alignment, thus automating the spot welding process and improving efficiency.

Claims

1. A flat series housing limiting device for limiting the position of a housing, the housing comprising a ceramic frame having a circuit cavity, a sealing ring disposed on one side of the ceramic frame having the circuit cavity, and a metal lead disposed on the side of the ceramic frame opposite to the sealing ring, characterized in that: The first layer plate, the second layer plate and the third layer plate are sequentially arranged, the first layer plate is provided with a positioning column protruding towards the second layer plate on one side of the second layer plate, positioning holes are formed on the second layer plate and the third layer plate at positions corresponding to the positioning column, and the positioning column is movably arranged in the positioning holes; a plurality of placing through grooves are formed on the second layer plate for movably arranging ceramic square frames in a vertical direction, the first layer plate is arranged against the second layer plate, the ceramic square frame is arranged in the placing through groove, the sealing ring is arranged against the first layer plate, and a gap is formed between the second layer plate and the third layer plate for extending the metal lead into the gap; A positioning pin protruding towards the third layer plate is arranged on one side of the second layer plate facing the third layer plate, a limiting hole is formed on the third layer plate at a position corresponding to the positioning pin, the positioning pin is arranged in the limiting hole and is screw-connected with the limiting hole, and one side of the shell with the inner cavity can be arranged against the first layer plate when the positioning pin is arranged in the limiting hole and is arranged against the limiting hole; An installation hole is formed on the inner side of the positioning pin and penetrates the second layer plate in a vertical direction, the installation hole comprises a first hole segment close to the first layer plate and a first threaded hole close to the third layer plate and smaller in diameter than the first hole segment, a step surface is formed at the joint of the first hole segment and the second hole segment, the limiting hole comprises a second hole segment close to the second layer plate for movably arranging the positioning pin therein and a second threaded hole away from the second layer plate and corresponding to the first threaded hole, and a vertical through hole is arranged on the first layer plate at a position corresponding to the first hole segment; A rectangular frame is further arranged on the side of the first layer plate away from the second layer plate, a screwing part is coaxially and movably arranged on the rectangular frame at a position corresponding to each through hole, the screwing part can freely rotate along the central axis of the screwing part, one end of the screwing part is movably arranged in the through hole and can move in the axial direction of the through hole, and the screw is screw-connected in the first threaded hole and the second threaded hole by rotating the screwing part; The screwing part comprises a rotating hole corresponding to the through hole and coaxially arranged with the through hole, a driving cone arranged in the rotating hole and used for driving and screwing the screw, and an elastic member arranged in the rotating hole and used for pressing the driving cone.

2. The flat family of housing containment apparatus of claim 1, wherein: The positioning pin is arranged in four and is arranged at four corners of the second layer plate, and the limiting hole and the through hole are correspondingly arranged.

3. The flat family of housing containment apparatus of claim 1 wherein: The first layer plate is made of transparent material.

4. The flat family of housing containment apparatus of claim 1 wherein: The positioning column is arranged in at least two and is symmetrically arranged on both sides of the first layer plate, and the limiting hole is correspondingly arranged.

5. The flat family of housing containment apparatus of claim 1 wherein: The placing through groove is in a rectangular shape, and a three-quarter circular opening is formed in the placing through groove at four corners of the placing through groove in a vertical direction; and an avoiding through groove is arranged on both sides of the placing through groove at positions corresponding to two connecting ribs of the metal lead.

6. The flat family of case stop as defined in any one of claims 1-5, wherein: At least one side of the second layer plate is provided with a first notch, and at least two sides of the third layer plate are respectively provided with a second notch.

7. The flat family of housing containment apparatus of claim 1 wherein: The rectangular frame is further provided with a limiting part movably arranged in a horizontal direction, and the limiting part is arranged against one side of the third layer plate away from the second layer plate when the rectangular frame is arranged against the first layer plate.

8. A method of using the flat series housing stop of claim 7, wherein: The method comprises the following steps: S1, the first layer plate is placed on the bottom layer with the positioning column upwards, the second layer plate is placed above the first layer plate with the positioning column passing through the positioning hole of the second layer plate until the second layer plate abuts against the first layer plate, the bonded shell with the sealing ring and the inner cavity on one side is placed downwards into the placing slot so that the sealing ring abuts against the first layer plate and the placing slot limits the movement of the shell in the horizontal direction; S2, after the shell is placed in each placing slot, the third layer plate is placed above the second layer plate with the positioning column passing through the positioning hole on the third layer plate, at this time, the positioning pin is collinear with the center of the limiting hole and is arranged in the limiting hole, until the end face of the positioning pin abuts against the inner wall of the limiting hole, at this time, the metal lead is located in the gap between the third layer plate and the second layer plate; S3, the first layer plate, the second layer plate and the third layer plate are turned over, the screw is placed on the tightening part, the rectangular frame is placed above the first layer plate with the tightening part aligning with the corresponding perforation, then the rectangular frame abuts against the first layer plate, at this time, the tightening part and the screw on the tightening part pass through the perforation and extend into the first hole section, the screw is screwed into the first threaded hole and the second threaded hole by rotating the tightening part, the limiting part abuts against the third layer plate by moving the limiting part, so as to limit the movement of the first layer plate, the second layer plate and the third layer plate in the vertical direction, at this time, the distance between the first layer plate and the third layer plate is consistent with the thickness of the shell, and the sealing ring abuts against the first layer plate; S4, the first layer plate, the second layer plate and the third layer plate are sequentially conveyed to the mirror inspection process and the spot welding process with the first layer plate upwards, the limiting part is moved and the rectangular frame is removed, and the first layer plate is removed for the mirror inspection process and the spot welding process.

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