Welding fixture

Abstract

The application discloses a welding jig, which comprises a base and a carrier, wherein the base comprises a plurality of positioning members, the carrier and first and second PCBs to be welded are provided with a plurality of first positioning holes matched with the sizes of the positioning members, and the first PCB is printed with solder paste; the carrier is provided with a first groove for placing the first and second PCBs and at least one rotatable fixing member for fixing the first and second PCBs to the first groove; when the carrier is assembled with the base, the plurality of positioning members can pass through the first positioning holes of the carrier, the first PCB and the second PCB from bottom to top. Through the plurality of positioning members and the first positioning holes, the first and second PCBs can be quickly aligned and assembled, and through the first groove and the at least one fixing member, the first and second PCBs can be quickly attached, so that the performance and yield of MEMS devices can be improved, the production cost can be reduced, and the production efficiency can be improved.

Description

Technical Field

[0001] This specification relates to the field of device packaging technology, and in particular to a welding fixture. Background Technology

[0002] In the field of MEMS (Micro-Electro-Mechanical Systems) device packaging, especially in the packaging process of acoustic MEMS devices (such as MEMS microphones), the precise assembly between PCBs (such as the assembly between the base PCB and the wall PCB) is a key step in ensuring the functional reliability of the device.

[0003] Currently, PCB assembly primarily relies on manual operation. The process involves printing solder paste onto the base, aligning and assembling the side panel with the base, followed by reflow soldering to solidify the connection, and finally cutting the panel into multiple units. During this assembly process, the positioning accuracy between PCBs directly affects the uniformity of solder paste distribution and the sealing performance of the package structure, thus impacting the acoustic performance and yield of MEMS devices. Since the operator's skill level and visual judgment play a decisive role in assembly accuracy, human error is unavoidable, easily leading to misalignment between the base and side panel. This misalignment can cause solder paste displacement, cold solder joints, or short circuits, resulting in package panel defects or even device failure. Furthermore, manual operation is inefficient, unsuitable for large-scale production, and inconsistent, leading to fluctuations in product yield.

[0004] There is currently no effective solution to the problem of misalignment between PCBs due to low assembly precision, which in turn affects device performance. Utility Model Content

[0005] This specification provides a welding fixture to solve the problem of misalignment between PCBs caused by low assembly accuracy, which in turn affects device performance.

[0006] This specification provides a welding fixture for assembling PCBs, the fixture comprising: a base and a carrier;

[0007] The base includes multiple positioning components. The carrier and the first PCB and the second PCB to be soldered are provided with multiple first positioning holes that match the size of the positioning components. Solder paste is printed on the first PCB. When the carrier is assembled with the base, the multiple positioning components can pass through the first positioning holes of the carrier, the first PCB and the second PCB from bottom to top.

[0008] The carrier is provided with a first groove for placing the first PCB and the second PCB, and at least one rotatable fastener for fixing the first PCB and the second PCB to the first groove.

[0009] In some embodiments of this specification, the positioning member includes a fixing part and a positioning part. The fixing part is looped around the positioning part and fixedly connected to the base. The positioning part is columnar. The end face size of the second end of the positioning part is smaller than the end face size of the first end of the positioning part. The fixing part is looped around the first end of the positioning part. The positioning member passes through the carrier, the first PCB, and the first positioning hole of the second PCB from bottom to top from the second end of the positioning part.

[0010] In some embodiments of this specification, the base has a first recess and a second recess on opposite sides, and the first recess and the second recess are connected to the side wall of the base by an arc surface, so as to control the separation of the carrier from the base by the first recess and the second recess.

[0011] In some embodiments of this specification, the carrier is provided with at least one fixing hole corresponding to a fixing member, the fixing member including a fixing shaft and a rotatable clamping part sleeved on the fixing shaft, the fixing shaft being assembled to the carrier through the fixing hole.

[0012] In some embodiments of this specification, the fixed shaft includes a hollow rotating shaft and a spring ring fitted around the rotating shaft, the outer diameter of the spring matching the diameter of the first through hole;

[0013] The clamping part is a block-shaped structure with a first through hole. The rotating shaft of the spring is housed in the first through hole of the clamping part and is assembled to the carrier through the fixing hole.

[0014] In some embodiments of this specification, the rotating shaft includes a first shaft portion having a second through hole and a second shaft portion having a second groove, the second groove communicating with the second through hole; the outer diameter of the first shaft portion matches the mean diameter of the spring; the outer diameter of the second shaft portion is larger than the outer diameter of the first shaft portion; the spring is looped around the first shaft portion, and the first shaft portion is located at one end of the rotating shaft near the carrier;

[0015] The fastener also includes a screw and a nut. The screw is threaded to the nut through a fixing hole, a second through hole in the first shaft portion, and a second groove in the second shaft portion on the bottom surface of the carrier.

[0016] In some embodiments of this specification, the first through hole includes a cylindrical first hole portion and a second hole portion, the first hole portion and the second hole portion are connected, and the diameter of the first hole portion is smaller than the diameter of the second hole portion. The diameter of the first hole portion matches the outer diameter of the screw, and the diameter of the second hole portion matches the outer diameter of the spring. The first hole portion is located on the side of the clamping portion closer to the carrier, and the second hole portion is located on the side of the clamping portion away from the carrier.

[0017] In some embodiments of this specification, the fixture further includes a top plate, which has a plurality of second positioning holes that match the size of the positioning members. When the carrier and the top plate are assembled with the base, the plurality of positioning members can pass through the first positioning holes of the carrier, the first PCB and the second PCB and the second positioning holes of the top plate from bottom to top.

[0018] In some embodiments of this specification, the vehicle is made of synthetic stone and the top plate is made of ceramic.

[0019] In some embodiments of this specification, the depth of the first groove is less than the sum of the thicknesses of the first PCB and the second PCB.

[0020] The soldering fixture for assembling PCBs provided in this specification includes a base and a carrier. The base includes multiple positioning elements. The carrier, along with the first and second PCBs to be soldered, has multiple first positioning holes that match the dimensions of the positioning elements. Solder paste is printed on the first PCB. The carrier has a first groove for placing the first and second PCBs, and at least one rotatable fixing element for fixing the first and second PCBs to the first groove. When the carrier is assembled with the base, the multiple positioning elements can pass through the first positioning holes of the carrier, the first PCB, and the second PCB from bottom to top. Furthermore, the carrier, which holds and fixes the first and second PCBs, can be flow soldered to achieve soldering of the first and second PCBs. The cooperation of the multiple positioning elements with the first positioning holes enables rapid alignment and assembly of the first and second PCBs. Furthermore, the first groove of the carrier and at least one fixing element enable rapid bonding of the first and second PCBs. The cooperation of the base and carrier avoids misalignment between PCBs caused by low assembly precision, thereby improving the performance and yield of MEMS devices, reducing production costs, and increasing production efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this application in any way. Furthermore, the shapes and scales of the components in the drawings are merely illustrative to aid in understanding this application and do not specifically limit the shapes and scales of the components. Those skilled in the art, guided by the teachings of this application, can select various possible shapes and scales to implement this application according to specific circumstances.

[0023] Figure 1 A schematic diagram of a double-layer PCB is shown in an embodiment of this specification;

[0024] Figure 2 A schematic diagram of a welding fixture in an embodiment of this specification is shown;

[0025] Figure 3 The image shown is a schematic diagram of the base in an embodiment of this specification;

[0026] Figure 4 The diagram shown is a schematic representation of a positioning element in an embodiment of this specification.

[0027] Figure 5 The diagram shown is a schematic representation of the vehicle in an embodiment of this specification.

[0028] Figure 6 The diagram shown is a schematic representation of the clamping part in an embodiment of this specification.

[0029] The reference numerals in the above figures are as follows:

[0030] 100. Base; 110. Positioning component; 120. First recess; 130. Second recess; 140. Mounting hole; 150. Direction indicator; 111. Fixing part; 112. Positioning part;

[0031] 200, Carrier; 210, First positioning hole; 220, First groove; 230, Fixing element; 240, Third groove; 250, Direction indicator; 231, Nut; 232, Shaft; 233, Spring; 234, Clamping part; 235, Screw; 610, First hole; 620, Second hole. Detailed Implementation

[0032] The principles and spirit of this specification will now be described with reference to several exemplary embodiments. It should be understood that these embodiments are given merely to enable those skilled in the art to better understand and implement this specification, and are not intended to limit the scope of this specification in any way. Rather, these embodiments are provided to make this disclosure more thorough and complete, and to fully convey the scope of this disclosure to those skilled in the art.

[0033] In the field of MEMS devices, to meet certain performance requirements, some modules use a double-layer PCB. This involves printing solder paste on one of two PCBs, connecting and assembling the two PCBs, and then performing flow soldering on the assembled double-layer PCB. For example... Figure 1 As shown, a soldered double-layer PCB may include a Base PCB, a Wall PCB, and solder paste for connecting the Base PCB and the Wall PCB.

[0034] Currently, the assembly between the base PCB and wall PCB is generally done manually. However, the operator's skill level and visual judgment play a decisive role in assembly accuracy. Human error can easily lead to misalignment between the base and the wall panel. This misalignment can cause problems such as solder paste misalignment, cold solder joints, or short circuits, resulting in defects in the package panel or even device failure. Furthermore, manual operation is inefficient, difficult to adapt to the needs of large-scale production, and has poor consistency, leading to fluctuations in product yield and low production efficiency.

[0035] To address the aforementioned issues, this specification provides a welding fixture that enables rapid and precise assembly between PCBs, improving the performance and yield of MEMS devices, reducing production costs, and increasing production efficiency. The welding fixture will be described below with reference to the accompanying drawings.

[0036] This specification provides a welding fixture through its embodiments. (Refer to...) Figure 2 As shown, it may include a base 100 and a carrier 200.

[0037] The base 100 may include multiple positioning elements 110. The carrier 200 and the first and second PCBs to be soldered have multiple first positioning holes 210 that match the size of the positioning elements 110. Solder paste is printed on the first PCB. Therefore, when the carrier 200 is assembled with the base 100, the multiple positioning elements 110 can pass through the first positioning holes 210 of the carrier 200, the first PCB, and the second PCB from bottom to top.

[0038] The carrier 200 may be provided with a first groove 220 for placing the first PCB and the second PCB, and at least one rotatable fastener 230 for fixing the first PCB and the second PCB to the first groove 220.

[0039] It is understood that the size matching between the first positioning hole 210 and the positioning member 110 can be that the diameter of the first positioning hole 210 matches the outer diameter of the positioning member 110. The first positioning hole 210 on the carrier 200 can be set in the first groove 220. The fixing member 230 can be fixed to the periphery of the first groove 220 on the carrier 200. Then, by rotating the fixing member 230, a part of the fixing member 230 can be positioned above or away from the first groove 220 to fix or unfix the PCB in the first groove 220.

[0040] It is understood that the position and distribution of the positioning member 110 on the base 100 are matched with the position and distribution of the first positioning hole 210 on the carrier 200, the first PCB and the second PCB, so that when the positioning member 110 passes through the corresponding first positioning hole 210, the first PCB and the second PCB can be aligned.

[0041] Taking three positioning elements 110 and three first positioning holes 210 as an example, three positioning elements 110 can be provided on the base 100, and the three positioning elements 110 can be arranged in a triangular pattern. Similarly, three first positioning holes 210 can be provided on the carrier 200, the first PCB, and the second PCB, and the distribution of the three first positioning holes 210 is the same as that of the three positioning elements 110. For example, refer to... Figure 3 and Figure 5 As shown, the base 100 can be a square structure, with three positioning members 110 located at the three corners of the square base 100, forming a right-angled triangle. Correspondingly, the first positioning holes 210 of the carrier 200 can be located at the three corners of the square first groove 220, and the shape formed by the first positioning holes 210 of the carrier 200 is the same as the right-angled triangle formed by the positioning members 110 on the base 100. The first positioning holes 210 on the PCB can be located at the three corners of the square first PCB and the second PCB, and the shape formed by the first positioning holes 210 on the PCB is the same as the right-angled triangle formed by the positioning members 110 on the base 100. This allows the fixing member 230 on the base 100 to penetrate from bottom to top through the carrier 200 and the first positioning holes 210 on the PCB when using a welding fixture, enabling rapid and precise assembly of the first PCB and the second PCB. Specifically, the position and number of the first positioning holes 210 and the positioning members 110 can be set based on the shape and size of the first PCB and the second PCB.

[0042] In practical implementation, the base 100 can be placed on a flat surface, and the carrier 200 can be placed on top of the base 100, such that the positioning member 110 on the base 100 can pass through the corresponding positioning hole on the carrier 200, and the first groove 220 on the carrier 200 is located on the side of the carrier 200 away from the base 100. Further, the first PCB and the second PCB are stacked in the first groove 220, and the positioning member 110 on the base 100 passing through the first positioning hole 210 of the carrier 200 simultaneously passes through the corresponding first positioning holes 210 on the first PCB and the second PCB, at which point the first PCB and the second PCB are aligned. Further still, by rotating at least one fixing member 230 around the periphery of the first groove 220, a portion of the fixing member 230 can be rotated to be positioned above the second PCB within the first groove 220, thereby securing the first PCB and the second PCB within the first groove 220 while achieving a tight fit between the two PCBs, preventing cold solder joints and thus affecting device performance.

[0043] The welding fixture in the embodiments of this specification can achieve rapid alignment and assembly of the first PCB and the second PCB through the cooperation of multiple positioning elements 110 and the first positioning hole 210. Furthermore, the first groove 220 of the carrier 200 and at least one fixing element 230 can achieve tight fit between the first PCB and the second PCB. The arrangement of the base 100 and the carrier 200 can avoid misalignment between PCBs caused by low assembly accuracy, thereby improving the performance and yield of MEMS devices, reducing production costs, and increasing production efficiency.

[0044] refer to Figure 4 As shown in some embodiments of this specification, the positioning member 110 includes a fixing part 111 and a positioning part 112. The fixing part 111 is fitted around the positioning part 112 and is fixedly connected to the base 100. The positioning part 112 is columnar, and the end face size of the second end of the positioning part 112 is smaller than the end face size of the first end of the positioning part 112. The fixing part 111 is fitted around the first end of the positioning part 112. The positioning member 110 passes from bottom to top through the carrier 200, the first PCB, and the first positioning hole 210 of the second PCB from the second end of the positioning part 112. The size of the second end face is smaller than the size of the first end face so that the second end can quickly pass through the first positioning hole 210 on the carrier 200 and the PCB, improving alignment efficiency.

[0045] It is understood that the end face size of the second end of the positioning part 112 is smaller than the end face size of the first end. That is, the side wall of the positioning part 112 includes two parts: a first side wall that connects to the end face of the first end of the positioning part 112 and is perpendicular to the end face of the first end, and a side wall that connects the first side wall to the second end and forms a certain angle with the end faces of the first side wall and the second end, and the angles are all greater than 90 degrees.

[0046] Specifically, the fixing part 111 can be annular and can be looped around the first end of the positioning part 112. The inner diameter of the fixing part 111 matches the outer diameter of the first end of the positioning part 112. Furthermore, the fixing part 111 can be threaded internally, and correspondingly, the periphery of the first end of the positioning part 112 can be threaded to match the internal thread of the fixing part 111, thereby achieving a threaded connection between the positioning part 112 and the fixing part 111. Of course, the fixing part 111 and the positioning part 112 can also be detachably connected through other structures, or they can be connected without a fixed connection, simply by looping the fixing part 111 around the first end of the positioning part 112. This specification does not limit this.

[0047] refer to Figure 3 As shown, in some embodiments of this specification, the fastener can be mounted on the base 100 through two mounting holes 140 with different diameters. The diameter of the first section of the mounting hole matches the outer diameter of the fixing part 111, and the diameter of the second section of the mounting hole matches the outer diameter of the positioning part 112. The first section of the mounting hole 140 is located on the side of the base 100 away from the carrier, and the second section of the mounting hole 140 is located on the side of the base 100 closer to the carrier. In a specific embodiment, the fixing part 111 and the positioning part 112 can be fixedly installed first, and then the assembled fastener can pass through the mounting hole 140 from the bottom surface of the base 100 (the side away from the carrier) to achieve a fixed connection between the fastener 110 and the base 100. In addition, multiple through holes can be provided on the base 100 to reduce the weight of the base 100 and the material cost of the base 100.

[0048] In some embodiments of this specification, the base 100 has a first recess 120 and a second recess 130 on opposite sides. The first recess 120 and the second recess 130 are connected to the sidewall of the base 100 via an arc surface, so as to control the separation of the carrier 200 from the base 100. The connection of the first recess 120 and the second recess 130 to the sidewall of the base 100 via an arc surface can be understood as the first recess 120 and the second recess 130 forming a smooth surface with the sidewall they are located on, thereby improving the safety of the welding fixture.

[0049] In a specific embodiment, taking manual operation as an example, after assembling the base 100, carrier 200, and PCB, the operator can insert their fingers into the first recess 120 and the second recess 130, and control the carrier 200 to lift it upwards from the base 100, separating the carrier 200 from the base 100. The first recess 120 and the second recess 130 enable rapid separation of the carrier 200 from the base 100, improving welding efficiency.

[0050] In some embodiments of this specification, the base 100 may be made of aluminum or other materials with a certain weight to provide a stable platform for PCB alignment and assembly. The base 100 may not be involved in subsequent PCB soldering.

[0051] refer to Figure 5 As shown, in some embodiments of this specification, the carrier 200 is provided with at least one fixing hole corresponding to the fixing member 230. The fixing member 230 includes a fixing shaft and a rotatable clamping part 234 sleeved on the fixing shaft. The fixing shaft is assembled to the carrier 200 through the fixing hole. In the embodiments of this specification, a rotatable connection between the fixing member 230 and the carrier 200 can be achieved through the cooperation of the fixing hole and the fixing member 230 including the fixing shaft and the clamping part 234.

[0052] Specifically, the fixing hole can be provided on the periphery of the first groove 220. During the rotation of the clamping part 234 around the fixing axis, part of the clamping part 234 can be located above the first groove 220. Thus, when the first PCB and the second PCB are placed in the first groove 220, the clamping part 234 can be placed above the second PCB by controlling the rotation of the clamping part around the fixing axis. Through this clamping part 234, the first PCB and the second PCB can be fixed to the carrier 200, and the first PCB and the second PCB can be tightly fitted together.

[0053] In some embodiments of this specification, the fixed shaft includes a hollow rotating shaft 232 and a spring 233 sleeved around the rotating shaft 232, the outer diameter of the spring 233 matching the diameter of the first through hole; the clamping part 234 is a block structure with a first through hole, the rotating shaft 232 sleeved with the spring 233 is accommodated in the first through hole of the clamping part 234, and is assembled to the carrier 200 through the fixed hole.

[0054] In some embodiments of this specification, the rotating shaft 232 includes a first shaft portion having a second through hole and a second shaft portion having a second groove, the second groove communicating with the second through hole, the outer diameter of the first shaft portion matching the mean diameter of the spring 233, and the outer diameter of the second shaft portion being larger than the outer diameter of the first shaft portion; the spring 233 is sleeved around the first shaft portion, the first shaft portion being located at one end of the rotating shaft 232 near the carrier 200; the fixing member 230 further includes a screw 235 and a nut 231, the screw 235 being threaded through the bottom surface of the carrier 200 through the fixing hole, the second through hole of the first shaft portion, and the second groove of the second shaft portion and threadedly connected to the nut 231.

[0055] Specifically, the diameter of the first through hole of the clamping part 234 can be larger than the diameter of the fixing hole on the carrier 200. By setting the rotating shaft 232 including the first shaft part and the second shaft part, the screw 235 and the nut 231, the first shaft part of the spring 233 in the first through hole can be extended and retracted to adjust the distance between the clamping part 234 and the second groove, which can be adapted to the assembly of PCBs of different thicknesses.

[0056] It is understood that when assembling the fastener 230 with the carrier 200, the side of the carrier 200 with the first groove 220 can be used as the top surface, and the side opposite the top surface can be used as the bottom surface. The clamping part 234 can be placed on the top surface of the carrier 200, and the first through hole of the clamping part 234 can be connected to the fixing hole on the carrier 200. The rotating shaft 232 with the spring 233 ring is inserted into the first through hole of the clamping part 234, and the screw 235 is threaded through the bottom surface of the carrier 200, through the fixing hole, the clamping part 234, the second through hole and the second groove of the rotating shaft 232, and then threadedly connected to the nut 231. In the embodiment of this specification, the rotatable connection between the fastener 230 and the carrier 200 is achieved through the cooperation between the rotating shaft 232, the spring 233, the clamping part 234, the screw 235 and the fixing hole.

[0057] refer to Figure 6 As shown, in some embodiments of this specification, the first through hole includes a cylindrical first hole portion 610 and a second hole portion 620, the first hole portion 610 and the second hole portion 620 are connected, and the diameter of the first hole portion 610 is smaller than the diameter of the second hole portion 620. The diameter of the first hole portion 610 matches the outer diameter of the screw 235, and the diameter of the second hole portion 620 matches the outer diameter of the spring 233. The first hole portion 610 is located on the side of the clamping portion 234 near the carrier 200, and the second hole portion 620 is located on the side of the clamping portion 234 away from the carrier 200.

[0058] It is understood that the first through hole may include two holes with different diameters, and the diameter of the hole closer to the carrier 200 (first hole 610) is smaller than the diameter of the hole farther from the carrier 200 (second hole 620). Furthermore, when assembling the carrier 200 and the fixing member 230, the first hole 610 is used to pass through the screw 235, and the second hole 620 is used to accommodate the rotating shaft 232 of the ring spring 233, so that the spring 233 can extend and retract within the space formed by the end face of the second shaft portion connecting the first shaft portion and the second hole 620, thereby adjusting the distance between the clamping part 234 and the second groove.

[0059] In some embodiments of this specification, the carrier 200 may also have multiple holes, which may be located on the shaft portion of the first groove 220 and / or within the first groove 220. Further, the first groove 220 may be mesh-like, and the holes within the first groove 220 may be located around the periphery of the mesh to reduce the weight of the carrier 200 and lower the material cost of the carrier 200.

[0060] In some embodiments of this specification, the carrier 200 may further include at least two third grooves 240. The third grooves 240 may be distributed on opposite sides of the first groove 220, for example, symmetrically distributed. The depth of the third grooves 240 may be less than or equal to the depth of the first groove 220. With the third grooves 240 provided, after the first PCB and second PCB are soldered together and the clamping part 234 is rotated to move away from the second PCB, the soldered PCB can be quickly separated from the carrier 200 by controlling the third grooves 240.

[0061] In some embodiments of this specification, a direction indicator 250 may also be provided on the carrier 200 to indicate the placement direction of the first PCB, the second PCB, and / or the carrier 200. Furthermore, a direction indicator 150 may also be provided on the base 100 at a position corresponding to the direction indicator on the carrier 200 to indicate the placement direction of the carrier 200, thereby improving assembly efficiency.

[0062] In some embodiments of this specification, the depth of the first groove 220 is less than the sum of the thicknesses of the first PCB and the second PCB. By controlling the depth of the first groove 220, the first PCB and the second PCB can be tightly fitted together, avoiding poor soldering between the PCBs.

[0063] In some embodiments of this specification, the fixture may further include a top plate, which is provided with a plurality of second positioning holes that match the size of the positioning member 110. When the carrier 200 and the top plate are assembled with the base 100, the plurality of positioning members 110 can pass through the first positioning holes 210 of the carrier 200, the first PCB and the second PCB and the second positioning holes of the top plate from bottom to top.

[0064] It is understandable that when using the welding fixture, after placing the first PCB and the second PCB in the first groove 220, the top plate is placed on top of the second PCB, and then the fixing member 230 is rotated to rotate the fixing member 230 above the top plate. By adding a top plate between the fixing member 230 and the second PCB, and through the cooperation of the top plate, the first groove 220 and the fixing member 230, the flatness of the first PCB and the second PCB can be adjusted while achieving precise and tight fit between them, thus reducing PCB deformation.

[0065] In some embodiments of this specification, the vehicle 200 is made of synthetic stone and the top plate is made of ceramic.

[0066] It is understandable that synthetic stone and ceramics have good heat resistance, allowing the carrier 200 and top plate to be soldered together with the first and second PCBs, and can be reused repeatedly. Furthermore, due to the high hardness and resistance to deformation of ceramics, a top plate made of ceramic can be better used to flatten the first and second PCBs. Of course, the carrier 200 and top plate can also be made of other materials with similar properties; this specification does not impose any restrictions on this.

[0067] In the embodiments described in this specification, during each batch of soldering, each group of two PCBs to be soldered can have a corresponding carrier 200 and top plate, and the base 100 can be shared on the same production line. After assembling the two PCBs to be soldered using the base 100, carrier 200, and top plate, the carrier 200, top plate, and the two PCBs to be soldered can be flow soldering together. This avoids misalignment of the assembled PCBs during the flow soldering process, or gaps between PCBs due to PCB deformation, which can lead to cold solder joints. This can further improve the yield of components and increase production efficiency.

[0068] Continue to refer to Figure 1 As shown, the specific usage process of the welding fixture provided in the embodiments of this specification will be described below. It is understood that in this embodiment, the number of positioning elements 110, the first positioning hole 210, and the second positioning hole are all three, and the number of fixing elements 230 is six, with the assembly between the Base PCB and the Wall PCB as an example. Solder paste is printed on the Base PCB.

[0069] Before assembling the Base PCB and Wall PCB, the positioning component 110 needs to be assembled with the base 100, and the fixing component 230 needs to be assembled with the carrier 200 through the fixing holes, so that the clamping part 234 of the fixing component 230 can rotate around the pivot 232. When using the soldering fixture, the base 100 with the fixing component 230 installed is placed on a horizontal plane, and the fixing component 230 is passed through the three first positioning holes 210 on the carrier 200, and the carrier 200 is placed above the base 100. Then, the Base PCB and Wall PCB are placed in the first groove 220 of the carrier 200, so that the fixing component 230 again passes through the first positioning holes 210 on the Base PCB and Wall PCB. When placing the Base PCB, the side printed with solder paste should face upwards so that the solder paste is positioned between the Base PCB and Wall PCB. Next, the positioning member 110 is passed through the second positioning hole of the top plate, and the top plate is placed above the wall PCB. The clamping part 234 of the fixing member 230 on the fixture is rotated to rotate the clamping part 234 above the top plate. At this time, the carrier 200, base PCB, wall PCB and top plate are fixed as a whole. The carrier 200 is controlled to separate from the base 100 by the first recess 120 and the second recess 130 on the base 100, and the fixed carrier 200, base PCB, wall PCB and top plate are flow soldered together.

[0070] After welding is completed and cooled, the clamping part 234 of the fixing part 230 on the carrier 200 can be moved away from the top plate. Then, the top plate, the welded Base PCB and Wall PCB can be separated from the carrier 200 in sequence through the third groove 240 on the carrier 200. At this time, the welding of the Base PCB and Wall PCB is completed.

[0071] In the embodiments described in this specification, by designing the number and position of the positioning components 110 and positioning holes, the assembly of the Base PCB and Wall PCB can be completed quickly, accurately, and precisely. Furthermore, combined with the fixing component 230 and the top plate, a tight and flat fit between the Base PCB and Wall PCB can be achieved, thereby improving the performance and yield of MEMS devices, reducing production costs, and increasing production efficiency.

[0072] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, system embodiments are basically similar to method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments in this specification. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0073] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A welding fixture, characterized in that, The fixture, used for assembling PCBs, includes a base and a carrier. The base includes multiple positioning components. The carrier and the first PCB and the second PCB to be soldered are provided with multiple first positioning holes that match the size of the positioning components. Solder paste is printed on the first PCB. When the carrier is assembled with the base, the multiple positioning components can pass through the first positioning holes of the carrier, the first PCB and the second PCB from bottom to top. The carrier is provided with a first groove for placing the first PCB and the second PCB, and at least one rotatable fastener for fixing the first PCB and the second PCB to the first groove.

2. The welding fixture according to claim 1, characterized in that, The positioning component includes a fixing part and a positioning part. The fixing part is looped around the positioning part and fixedly connected to the base. The positioning part is columnar. The end face size of the second end of the positioning part is smaller than the end face size of the first end of the positioning part. The fixing part is looped around the first end of the positioning part. The positioning component passes through the carrier, the first PCB and the first positioning hole of the second PCB from bottom to top from the second end of the positioning part.

3. The welding fixture according to claim 1 or 2, characterized in that, The base has a first recess and a second recess on opposite sides. The first recess and the second recess are connected to the side wall of the base by an arc surface. When the carrier is assembled with the base as a whole, the carrier is controlled to separate from the base by the first recess and the second recess.

4. The welding fixture according to claim 1, characterized in that, The carrier is provided with at least one fixing hole corresponding to the fixing member. The fixing member includes a fixing shaft and a rotatable clamping part sleeved on the fixing shaft. The fixing shaft is assembled to the carrier through the fixing hole.

5. The welding fixture according to claim 4, characterized in that, The fixed shaft includes a hollow rotating shaft and a spring that is looped around the rotating shaft; The clamping part is a block structure with a first through hole. The rotating shaft of the spring is housed in the first through hole of the clamping part and is assembled to the carrier through the fixing hole. The outer diameter of the spring matches the diameter of the first through hole.

6. The welding fixture according to claim 5, characterized in that, The rotating shaft includes a first shaft portion having a second through hole and a second shaft portion having a second groove, the second groove communicating with the second through hole. The outer diameter of the first shaft portion matches the mean diameter of the spring, and the outer diameter of the second shaft portion is larger than the outer diameter of the first shaft portion. The spring is looped around the first shaft portion, and the first shaft portion is located at one end of the rotating shaft near the carrier. The fastener also includes a screw and a nut. The screw is threaded to the nut through a fixing hole, a second through hole in the first shaft portion, and a second groove in the second shaft portion on the bottom surface of the carrier.

7. The welding fixture according to claim 6, characterized in that, The first through hole includes a cylindrical first hole portion and a second hole portion, which are connected. The diameter of the first hole portion is smaller than the diameter of the second hole portion. The diameter of the first hole portion matches the outer diameter of the screw, and the diameter of the second hole portion matches the outer diameter of the spring. The first hole portion is located on the side of the clamping portion closer to the carrier, and the second hole portion is located on the side of the clamping portion away from the carrier.

8. The welding fixture according to claim 1, characterized in that, It also includes a top plate, which has a plurality of second positioning holes that match the size of the positioning components. When the carrier and the top plate are assembled with the base, the plurality of positioning components can pass through the first positioning holes of the carrier, the first PCB and the second PCB and the second positioning holes of the top plate from bottom to top.

9. The welding fixture according to claim 8, characterized in that, The vehicle is made of synthetic stone, and the roof is made of ceramic.

10. The welding fixture according to claim 1, characterized in that, The depth of the first groove is less than the sum of the thicknesses of the first PCB and the second PCB.

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