Circuit board assembling and welding tool

Abstract

The utility model discloses a circuit board assembling and welding tool, which relates to the field of electronic hardware welding and comprises a base, a plurality of upper blocks are arranged on the base, and circuit board components are fixed on the upper blocks. A through groove is formed in one side of the upper surface of the upper block, a plurality of fixing grooves are formed in the two side walls of the through groove, and a plurality of shaft holes are formed in the two ends of the through groove and penetrate through the upper block. The circuit board assembly is clamped in the fixing groove, and a pin shaft is arranged in the shaft hole and sequentially penetrates through the upper block and the circuit board assembly. Accurate positioning of the circuit board assembly is achieved, displacement is prevented, and the welding and positioning quality of the circuit board assembly is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of electronic hardware welding, and mainly to a circuit board assembly welding fixture. Background Technology

[0002] Most photoelectric direct-reading remote transmission smart water meters on the market use a through-beam photoelectric encoding principle. The transceiver circuit boards (i.e., photoelectric signal acquisition units) are arranged in parallel, and the space inside the water meter counter is limited. Therefore, hard-connecting multiple circuit boards is the optimal combination. However, this method involves many solder points, and the relative positioning between the transceiver circuit boards is critical. Traditional manual and machine soldering often fails to achieve precise positioning, leading to displacement in various directions after soldering, frequently resulting in photoelectric encoding errors and misreadings. Especially small displacements may cause the meter to pass detection, but after a period of operation, reading errors or failures may occur, leading to metering disputes.

[0003] Chinese Patent Publication No. CN101765333B, Publication Date: June 30, 2010, discloses a Chinese patent entitled "Circuit Board Welding Fixture," which includes a clamping device for holding circuit boards. The circuit board welding fixture further includes a connecting device with one end mounted on a base and the other end connected to the clamping device. This connecting device includes a pair of support blocks with mounting holes on their contact surfaces, the mounting holes forming an angle of 30° to 60° with the bottom plane of the support blocks along the length of the contact surfaces; and a connecting rod disposed within the mounting holes. Although this welding fixture includes a clamping device, the clamping device is relatively simple and prone to displacement. Utility Model Content

[0004] This utility model provides a circuit board assembly and welding fixture. By setting a fixing groove and a pin, it can achieve precise positioning of the circuit board assembly, prevent displacement, and ensure the welding and positioning quality of the circuit board assembly.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a circuit board assembly and welding fixture, including a base, on which a plurality of upper blocks are provided, and circuit board assemblies are fixed on the upper blocks; a through groove is provided on one side of the upper surface of the upper block, and a plurality of fixing grooves are provided on the two side walls of the through groove, and a plurality of shaft holes are provided at both ends of the through groove, the shaft holes penetrating the upper block; the circuit board assembly includes a plurality of transceiver circuit boards, and a plurality of positioning pin holes are provided on the transceiver circuit boards, the positioning surface of the transceiver circuit board is engaged in the fixing groove, and a pin is provided in the shaft hole and passes through the plurality of positioning pin holes in sequence.

[0006] Preferably, several positioning pin holes are respectively set on both sides of the transceiver circuit board plane, and are asymmetrical. This allows for identification of correct placement before soldering, avoiding misplacement that could lead to finished product scrap. If there is significant obstruction, it indicates that the transceiver circuit board is misplaced on the left and right sides; flipping it over will correct the misplacement. The upper block has several precise left-right and front-back fixing slots for securing the transceiver circuit board; to facilitate insertion and removal, a large through-slot is formed in the center of the fixing slot; and a fully through-hole is provided to restrict the vertical movement of the transceiver circuit board. Through the asymmetrical positioning pin hole design, operators can quickly identify whether the transceiver circuit board is correctly placed before soldering, avoiding soldering errors and finished product scrap due to misplacement, significantly reducing the scrap rate and saving costs. It also reduces the time required for readjustment due to placement errors, improves the efficiency of soldering operations, and ensures a smooth production process.

[0007] Preferably, the transceiver circuit board has guide sections at its four corners and a welding tail at one end. Welding plates are located on both sides of the welding tail, and positioning surfaces are located on both sides of the plane. The positioning surfaces on the thin-walled sides are precision-machined to prevent misalignment during panel cutting. To facilitate insertion into the fixing slot and avoid injury to the operator, the transceiver circuit board has guide sections at its four corners, i.e., sharp chamfered corners. The guide section design makes it easier to insert the transceiver circuit board into the fixing slot, reducing alignment time during assembly and improving assembly efficiency.

[0008] Preferably, the circuit board assembly includes a main circuit board with several through-slots, into which the soldering tail passes. Solder pads are located on both sides of the long side of the through-slots. The pin is a slender shaft with chamfered ends for easy insertion. The design of the through-slots and solder pads on the main circuit board, along with the slender shaft and chamfered ends of the pin, allows the soldering tail to pass smoothly into the through-slots, facilitating insertion and improving the convenience and efficiency of soldering. The pin passes through the positioning pin hole, firmly connecting the transceiver circuit board to the main circuit board, enhancing the overall structural stability of the circuit board assembly and ensuring no loosening during soldering. The design of the through-slots and solder pads provides a good contact area for soldering, ensuring soldering quality and improving the functional reliability of the circuit board assembly.

[0009] Preferably, the transceiver circuit board includes a left transceiver circuit board, a middle transceiver circuit board, and a right transceiver circuit board. This categorized design makes the circuit board structure clearer, facilitating design, production, and maintenance. It also facilitates unified management of different types of transceiver circuit boards, reducing the possibility of confusion. The design of different types of transceiver circuit boards can be adjusted and optimized according to actual needs, improving the overall compatibility and adaptability of the circuit board assembly.

[0010] Preferably, a photosensitive element is mounted on the right side of the left transceiver circuit board, photosensitive elements are mounted on both sides of the middle transceiver circuit board, and a photosensitive element is mounted on the left side of the right transceiver circuit board. Photosensitive element pads are formed on both sides. The placement of photosensitive elements on the right side of the left transceiver circuit board, both sides of the middle transceiver circuit board, and the left side of the right transceiver circuit board achieves a reasonable layout of photosensitive elements, ensuring the functional requirements of the circuit board assembly in different locations. A reasonable layout of photosensitive elements can avoid mutual interference between components, improve the operational reliability of the photosensitive elements, and ensure the stable performance of the circuit board assembly.

[0011] Preferably, the main circuit board has several positioning holes, and the upper surface of the upper block has pin holes. The positioning holes are arranged asymmetrically. The pin holes are also arranged asymmetrically to restrain and position the circuit board assembly. The asymmetrical design of the positioning holes and pin holes, combined with the use of positioning pins, can more firmly fix the circuit board assembly, enhancing the stability and reliability of the fixture.

[0012] Preferably, the locating pin passes through the locating hole and the pin hole to fix the circuit board assembly to the upper block. The locating pin is a cylinder with guides at both ends. This facilitates insertion into the locating hole and pin hole, reducing alignment time during assembly and improving assembly efficiency. The design of the locating pin effectively prevents the circuit board assembly from loosening or shifting during soldering, improving the reliability and stability of the tooling.

[0013] Preferably, the upper surface of the upper block is provided with a stepped screw hole, the depth of which exceeds the height of the screw's cylindrical portion or disc head. This ensures that the screw does not protrude above the upper surface of the upper block. The stepped screw hole design allows the screw to be flush with the surface of the upper block after installation, improving the overall flatness of the tooling and avoiding welding defects caused by screw protrusion.

[0014] Preferably, several upper blocks are spaced apart on the base, and pin holes are located on one side of the through slot. This ensures convenient handling of the circuit board assembly. The base is a flat plate of a certain thickness, equipped with screw holes, allowing for direct tightening of screws during assembly.

[0015] The beneficial effects of this utility model are as follows: 1. This tooling can effectively ensure the positioning requirements between the transceiver circuit boards, ensuring that there are no photoelectric encoding errors or misalignments due to misalignment. 2. The near-perpendicular welding of the transceiver circuit board and the main circuit board ensures that the circuit board assembly does not interfere or collide with the counter during assembly, avoiding damage to the photosensitive element. 3. The design of transceiver circuit boards with the same substrate can increase the versatility between components and reduce the substrate molding mold and processing steps. 4. The asymmetrical design of the positioning pin holes on the transceiver circuit board allows for identification of correct placement before welding, avoiding misplacement that could lead to product scrap. 5. The non-centrally symmetrical positioning design of the main circuit board ensures that the main circuit board does not need to be readjusted due to placement errors, improving welding efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the circuit board assembly of this utility model.

[0018] Figure 3 This is a schematic diagram of the transceiver circuit board of this utility model.

[0019] Figure 4 This is a schematic diagram of the structure of the upper block of this utility model.

[0020] Reference numerals: Circuit board assembly 1, main circuit board 1-1, positioning hole 1-1-1, through-board groove 1-1-2, left transceiver circuit board 1-2, middle transceiver circuit board 1-3, plane 1-3-1, welding tail 1-3-2, positioning surface 1-3-3, positioning pin hole 1-3-4, guide part 1-3-5, right transceiver circuit board 1-4, upper block 2, fixing groove 2-1, through groove 2-2, shaft hole 2-3, pin hole 2-4, screw step hole 2-5, pin 3, positioning pin 4, screw 5, base 6, screw hole 6-1. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the manufacturing process of electronic circuit boards, the welding precision and positioning accuracy of circuit board assembly 1 directly affect product quality. The circuit board assembly and welding fixture provided by this utility model effectively solves the welding positioning problem of circuit board assembly 1 through ingenious structural design. Its specific implementation method is described in detail below.

[0023] like Figure 1As shown, this circuit board assembly and welding fixture uses a base 6 as its basic carrier. Several upper blocks 2 are mounted on the base 6; in this embodiment, six upper blocks 2 are preferably used. These upper blocks 2 are key components supporting the circuit board assembly 1. The design of the upper blocks 2 fully considers the positioning and fixing requirements of the circuit board assembly 1. A through groove 2-2 is provided on one side of its upper surface, and several fixing grooves 2-1 are distributed on both sides of the through groove 2-2. These fixing grooves 2-1 provide precise positioning for the circuit board assembly 1. Shaft holes 2-3 are provided at both ends of the through groove 2-2, penetrating the upper block 2 and providing a channel for the subsequent installation of the pin 3. These structures together constitute the basic framework for the positioning and fixing of the circuit board assembly 1.

[0024] like Figure 1 and Figure 4 As shown, the circuit board assembly 1 mainly consists of several transceiver circuit boards, each with several positioning pin holes 1-3-4. In this embodiment, two positioning pin holes 1-3-4 are preferably provided. These positioning pin holes 1-3-4 cooperate with the shaft holes 2-3 and fixing grooves 2-1 of the upper block 2 to achieve precise positioning. During assembly, the positioning surface 1-3-3 of the transceiver circuit board is engaged within the fixing groove 2-1. The shape and size of the fixing groove 2-1 are closely matched to the positioning surface 1-3-3 of the transceiver circuit board, ensuring precise horizontal positioning of the transceiver circuit board and preventing left-right or front-back displacement. Simultaneously, the pins 3 inserted into the shaft holes 2-3 pass through several positioning pin holes 1-3-4 in sequence. Through the penetrating action of the pins 3, the transceiver circuit board is fixed vertically, preventing vertical movement. In this way, the transceiver circuit board is effectively constrained in three-dimensional space, ensuring positional stability during the soldering process.

[0025] like Figure 3As shown, the positioning pin holes 1-3-4 of the transceiver circuit board are ingeniously designed. Several positioning pin holes 1-3-4 are respectively set on both sides of the transceiver circuit board plane 1-3-1, and are asymmetrical. This asymmetrical design brings significant advantages. Before soldering, the operator can quickly identify whether the transceiver circuit board is correctly placed by observing the position and layout of the positioning pin holes 1-3-4. If a serious obstruction is found during assembly, it indicates that the transceiver circuit board is misplaced on the left and right sides of the plane 1-3-1. At this time, simply flip it over. The fixing slot 2-1 set in the upper block 2 can not only accurately fix the transceiver circuit board left and right and front and back, but also form a large through slot 2-2 in the middle of the fixing slot 2-1 to facilitate the insertion and removal of the transceiver circuit board, making it easier for the operator to put into or take out the transceiver circuit board into the fixing slot 2-1. The design of the fully open shaft hole 2-3, used in conjunction with the pin 3, effectively restricts the vertical movement of the transceiver circuit board, further ensuring the accuracy of positioning. This asymmetrical 1-3-4 positioning pin hole design greatly reduces soldering errors and finished product scrap caused by misplacement of transceiver circuit boards, reduces production scrap rate, saves production costs, and avoids the time spent on readjustment due to placement errors. It also significantly improves the efficiency of soldering operations and ensures the smooth operation of the production process.

[0026] like Figure 3 As shown, the transceiver circuit board's structural design also fully considers the convenience and stability of assembly. Guide sections 1-3-5 are located at the four corners of plane 1-3-1 on the transceiver circuit board, with a welding tail 1-3-2 at one end. Welding plates are located on both sides of the welding tail 1-3-2, and positioning surfaces 1-3-3 are located on both sides of plane 1-3-1. The positioning surfaces 1-3-3 on both thin-walled sides are precision-machined, effectively preventing misalignment during panel cutting due to dimensional inaccuracies and ensuring accurate positioning. The guide sections 1-3-5 at the four corners of the transceiver circuit board feature a chamfered design. This design serves a dual purpose: firstly, it allows the transceiver circuit board to align more smoothly with the fixing slot 2-1 when inserted, reducing alignment time and improving assembly efficiency; secondly, the chamfered design prevents sharp corners of the transceiver circuit board from causing injury to the operator, ensuring operator safety.

[0027] like Figure 2As shown, the circuit board assembly 1 also includes a main circuit board 1-1. The main circuit board 1-1 has several through-board slots 1-1-2, and the soldering tail 1-3-2 of the transceiver circuit board can pass through the through-board slots 1-1-2. The solder pads on both sides of the long side of the through-board slot 1-1-2 provide a good contact area for soldering operations. The pin 3 adopts a slender shaft design and has chamfered ends. This design makes it easier to insert the pin 3 into the shaft hole 2-3 and the positioning pin hole 1-3-4. In the actual assembly process, the positioning surface 1-3-3 of the transceiver circuit board is first inserted into the fixing slot 2-1 of the upper block 2, and then the pin 3 is passed through the shaft hole 2-3 and the positioning pin hole 1-3-4 in sequence to firmly connect the transceiver circuit board and the main circuit board 1-1 together. The slender, chamfered pin 3, in conjunction with the shaft hole 2-3 and the positioning pin hole 1-3-4, makes the insertion operation smoother, enhances the overall structural stability of the circuit board assembly 1, and ensures that the circuit board assembly 1 will not loosen during the soldering process. Simultaneously, after the soldering tail 1-3-2 of the transceiver circuit board passes through the through-board groove 1-1-2 of the main circuit board 1-1, the large soldering area provided by the solder pad ensures soldering quality and improves the functional reliability of the circuit board assembly 1.

[0028] In the assembly and soldering process of the entire circuit board assembly 1, the upper block 2 is first fixed on the base 6. Then, the transceiver circuit board is inserted into the fixing groove 2-1 of the upper block 2 through the positioning surface 1-3-3. Utilizing the design of the fixing groove 2-1 and the guide part 1-3-5, the initial positioning of the transceiver circuit board is completed quickly and accurately. Next, the main circuit board 1-1 is placed in a suitable position, aligning the soldering tail 1-3-2 of the transceiver circuit board with the through-board groove 1-1-2 of the main circuit board 1-1 and inserting it. Finally, the chamfered pin 3 is inserted into the shaft hole 2-3 and the positioning pin hole 1-3-4, passing through the transceiver circuit board and the main circuit board 1-1, completing the assembly and fixation of the circuit board assembly 1. After that, the soldering operation can be carried out. Due to the precise positioning and stable connection of each component, the position of the circuit board assembly 1 can be kept unchanged during the soldering process, thereby achieving high-quality soldering and ensuring that the produced circuit board assembly 1 meets the design requirements and quality standards.

[0029] like Figure 1As shown, the basic structure of this circuit board assembly and welding fixture consists of a base 6 and an upper block 2. The base 6, serving as the main support for the entire fixture, is a flat plate of a certain thickness with screw holes 6-1. This design allows the fastening screws 5 to be directly tightened, thus securely mounting the upper block 2 onto the base 6. Several upper blocks 2 are spaced apart on the base 6. This layout ensures ease of handling the circuit board assembly 1 and provides sufficient space for subsequent welding operations. Each upper block 2 has a through groove 2-2 on one side of its upper surface, several fixing grooves 2-1 on both sides of the through groove 2-2, and shaft holes 2-3 at both ends of the through groove 2-2, which penetrate the upper block 2. These structures collectively provide the basic conditions for the positioning and fixing of the circuit board assembly 1. Furthermore, the upper surface of the upper block 2 also has pin holes 2-4, which are non-centrally symmetrically arranged, and screw stepped holes 2-5. These special designs play an important role in improving the performance of the fixture. Figure 2 As shown, circuit board assembly 1 consists of a transceiver circuit board and a main circuit board 1-1. The transceiver circuit board is further subdivided into a left transceiver circuit board 1-2, a middle transceiver circuit board 1-3, and a right transceiver circuit board 1-4. This classification design makes the structure of the circuit board clearer and more understandable. During the design phase, engineers can design specific transceiver circuit boards for different types, adjusting and optimizing their structure and function according to actual needs. In the production process, the classification design facilitates the planning and management of the production process, improving production efficiency. During maintenance, it also allows for faster and more accurate location of problems, facilitating repair and replacement. Simultaneously, this classification method also facilitates unified management of different types of transceiver circuit boards, reducing production errors caused by confusion.

[0030] In terms of component layout, photosensitive elements are mounted on the right side of the left transceiver circuit board 1-2, on both sides of the middle transceiver circuit board 1-3, and on the left side of the right transceiver circuit board 1-4. Photosensitive element pads are also provided on both sides. This layout achieves a reasonable distribution of photosensitive elements, ensuring the functional requirements of circuit board assembly 1 at different locations. A reasonable component layout avoids mutual interference between photosensitive elements, allowing each element to fully utilize its performance, improving the reliability of the photosensitive elements, and thus ensuring the stable performance of circuit board assembly 1. During the soldering process, the positions of each photosensitive element are relatively fixed. The positioning effect of the tooling ensures that the components do not shift during soldering, guaranteeing soldering quality.

[0031] like Figure 2As shown, the main circuit board 1-1 plays a crucial role in the overall circuit board assembly 1. The main circuit board 1-1 has several positioning holes 1-1-1, which are asymmetrically arranged and cooperate with the pin holes 2-4, which are also asymmetrically arranged on the upper surface of the upper block 2. During assembly, the positioning pin 4 passes through the positioning holes 1-1-1 and the pin holes 2-4, fixing the circuit board assembly 1 onto the upper block 2. The positioning pin 4 is a cylinder with guides at both ends. This design makes the insertion of the positioning pin 4 into the positioning holes 1-1-1 and the pin holes 2-4 smoother, greatly reducing alignment time during assembly and improving assembly efficiency. Simultaneously, the positioning pin 4 effectively restricts and positions the circuit board assembly 1, preventing loosening or displacement during soldering, thus enhancing the stability and reliability of the tooling.

[0032] The screw stepped hole 2-5 on the upper surface of the upper block 2 is also carefully designed. The depth of the large end of the screw stepped hole 2-5 exceeds the height of the screw's cylindrical part or disc head. This design ensures that the screw 5 will not protrude above the upper surface of the upper block 2 after installation. When the screw 5 is screwed into the screw stepped hole 2-5, its head can be fully embedded in the large end, keeping the surface of the upper block 2 flat. This design not only improves the overall aesthetics of the tooling, but more importantly, it avoids welding defects that may be caused by the screw 5 protruding. During the welding process, if the screw 5 protrudes, it may affect the operation of the welding tool and may even lead to problems such as uneven welds or incomplete welds. The design of the screw stepped hole 2-5 effectively solves these potential risks.

[0033] Assembly process.

[0034] When assembling the tooling of this invention, the pins 3 are first inserted into their respective corresponding pin holes 2-4 with an interference fit. Then, the upper block 2 is placed on the base 6. The screw step hole 2-5 is aligned with the screw hole 6-1 and the screw 5 is screwed in, ensuring that the screw 5 is screwed into the upper plane of the upper block 2.

[0035] During the welding process assisted by the tooling of this invention, the guide part 1-3-5 faces the upper block 2, and the positioning surface 1-3-3 and the plane 1-3-1 are aligned with the fixing groove 2-1 to insert the middle transceiver circuit board 1-3 into the upper block 2. Similarly, the left transceiver circuit board 1-2 and the right transceiver circuit board 1-4 are inserted into the upper block 2. The pin 3 passes through the shaft hole 2-3 on one side and sequentially through the positioning pin holes 1-3-4 of all transceiver circuit boards. If there is severe obstruction, it indicates that the left and right planes 1-3-1 of the obstructing transceiver circuit board are misaligned, and it can be flipped over. Next, the positioning hole 1-1-1 and the through-plate groove 1-1-2 are aligned with the positioning pin 4 and the welding tail 1-3-2 respectively and fitted in until the plane of the main circuit board 1-1 is flush with the upper plane of the upper block 2. The main circuit board 1-1 and the transceiver circuit board are welded together by hand or automatic machinery to form a circuit board assembly 1.

[0036] During the welding process, the precise positioning design of this fixture effectively ensures the positioning requirements between the transceiver circuit boards, preventing photoelectric encoding errors and misalignments. Simultaneously, the near-perpendicular welding method between the transceiver circuit boards and the main circuit board ensures that the circuit board components will not interfere or collide during subsequent assembly with the counter, effectively preventing damage to the photosensitive elements. Furthermore, the design of transceiver circuit boards on the same substrate increases the versatility of components, reduces substrate molding molds and processing steps, and lowers production costs. The asymmetrical design of the positioning pin holes on the transceiver circuit boards allows operators to quickly identify whether they are correctly placed before welding, avoiding finished product scrap due to misplacement; the non-centrally symmetrical positioning design of the main circuit board also ensures that the main circuit board does not need to be readjusted due to placement errors, greatly improving welding efficiency.

[0037] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A circuit board assembly and welding fixture, characterized in that, Includes a base, on which are several upper blocks, and on which circuit board assemblies are fixed; A through groove is provided on one side of the upper surface of the upper block, and several fixing grooves are provided on both sides of the through groove. Several shaft holes are provided at both ends of the through groove, and the shaft holes are set through the upper block. The circuit board assembly is fitted into a fixed slot, and a pin is provided in the shaft hole to pass through the upper block and the circuit board assembly in sequence.

2. The circuit board assembly welding fixture of claim 1, wherein The circuit board assembly includes several transceiver circuit boards, each with several positioning pin holes. These positioning pin holes are located on both sides of the transceiver circuit board plane and are asymmetrical.

3. The circuit board assembly welding fixture of claim 2, wherein The transceiver circuit board has guide sections at the four corners of the plane, a welding tail at one end, welding plates on the left and right sides of the welding tail, and positioning surfaces on both sides of the plane.

4. The circuit board assembly welding fixture of claim 3, wherein The circuit board assembly includes a main circuit board, which has several through-board slots. The soldering tail passes through the through-board slots, and the transceiver circuit board and the main circuit board are arranged perpendicularly.

5. The circuit board assembly welding tool according to claim 1 or 2 or 3, wherein The transceiver circuit board positioning surface is fixed in the fixed groove, and the shaft hole is provided with a pin that passes through a number of positioning pin holes in sequence. The transceiver circuit board includes a left transceiver circuit board, a middle transceiver circuit board and a right transceiver circuit board.

6. The circuit board assembly and welding fixture according to claim 5, characterized in that, A photosensitive element is mounted on the right side of the left transceiver circuit board, photosensitive elements are mounted on both sides of the middle transceiver circuit board, and a photosensitive element is mounted on the left side of the right transceiver circuit board.

7. The circuit board assembly welding fixture of claim 4, wherein, The main circuit board has several positioning holes, and the upper surface of the upper block has pin holes.

8. The circuit board assembly welding fixture of claim 7, wherein, The locating pins pass through the locating holes and pin holes to secure the circuit board assembly to the upper block.

9. The circuit board assembly welding fixture of claim 1 or 8, wherein The upper surface of the upper block is provided with a screw stepped hole, and the depth of the large hole end of the screw stepped hole exceeds the height of the screw cylinder or the head of the disc.

10. The circuit board assembly welding fixture of claim 9, wherein, Several upper blocks are spaced apart on the base, and pin holes are located on one side of the through slot.

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