A varistor welding system based on a precisely positioned welding structure

Abstract

The present invention relates to the technical field of welding, and discloses a varistor welding system based on a precise positioning welding structure, including a transmission part. The transmission part is located on the side of a wave soldering device. The transmission part includes a transmission device passing through the wave soldering device. A fixing frame is fixedly connected to the side of the transmission device. One end of the fixing frame is fixedly connected to the entrance of the wave soldering device. A limiting structure is arranged at the top end of the inner wall of the fixing frame, and a straightening structure is arranged at one end of the limiting structure close to the wave soldering device. The invention creates a structural system covering limiting, straightening and positioning functions for the varistor welding process, comprehensively ensures the welding position accuracy of the varistor, improves the welding quality and efficiency. The limiting structure avoids the varistor from shifting or falling during transmission. The straightening structure precisely straightens the varistor before entering the wave soldering. The positioning structure applies different pressures according to the requirements of different areas of the wave soldering to ensure the welding quality.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, and particularly to a varistor welding system based on a precise positioning welding structure. Background Art

[0002] A varistor is a voltage-sensitive non-linear resistor device. To ensure that the electrical performance, thermal management, mechanical stability, and process consistency of a circuit board reach an optimal state, precise positioning of the varistor is required during the welding process. In the prior art, the varistor after the trimming process is precisely inserted into the preset through-holes of the circuit board manually or by automated equipment. Subsequently, the circuit board on which the insertion operations of various electronic components including the varistor are completed moves along a predetermined track driven by the power provided by the transmission channel. When the circuit board is transported to the wave soldering equipment station, the wave soldering process is used to perform welding operations on the through-hole varistors on the circuit board.

[0003] To facilitate the insertion operation of the varistor, the through-hole size of the circuit board is usually larger than the pin size of the varistor, and the outer surface of the varistor has an annular structure. This geometric shape results in poor stability of the varistor on the circuit board. When the circuit board with the inserted varistor is transported in the transmission channel, due to the lack of effective straightening and positioning structures, during the transportation process, affected by external factors such as the vibration and slight bumps of the transmission channel, the varistor is extremely prone to position deviation. Especially before entering the wave soldering area, if the varistor has deviated in position and is not corrected in time, when the circuit board enters the wave soldering equipment for welding operations, the fluid impact of the solder during the wave soldering process will further exacerbate the uncertainty of the varistor's position. Summary of the Invention

[0004] Technical Problems to be Solved

[0005] Aiming at the above-mentioned shortcomings of the prior art, the present invention provides a varistor welding system based on a precise positioning welding structure, which can effectively solve the problem that the varistor is prone to position deviation due to the lack of a positioning structure during the welding process in the prior art.

[0006] To achieve the above object, the present invention is realized through the following technical solutions:

[0007] The present invention provides a varistor welding system based on a precise positioning welding structure, comprising:

[0008] Wave soldering equipment, inside which, according to different functions, is divided into a preheating area, a soldering area, and a cooling area from left to right in sequence. Above the inner wall of the wave soldering equipment, there is a positioning structure for applying different degrees of pressure to a varistor. The positioning structure includes a slide rail fixedly connected to the upper part of the inner wall of the wave soldering equipment. A positioning member is slidably connected to the inner wall of the slide rail. The positioning member applies different pressures to the varistor in the preheating area, the soldering area, and the cooling area. The positioning member includes a positioning post in contact with the varistor. At one end of the positioning post close to the slide rail, there is a positioning plate. The positioning plate drives the positioning post to move to apply different pressures to the varistor;

[0009] A transmission part, the transmission part is located on the side of the wave soldering equipment. A limiting structure is arranged inside the transmission part. In the initial state, the bottom end of the positioning post is higher than the bottom end of the limiting structure;

[0010] The positioning member further includes a carriage slidably connected to the inner wall of the slide rail. Elastic pieces are arranged on the side of the inner wall of the carriage. The middle part of the carriage is slidably connected to the outer wall of the positioning plate. One end of the positioning plate close to the slide rail is fixedly connected with a telescopic rod;

[0011] Among them, at one end of the limiting structure close to the wave soldering equipment, there is a straightening structure. When the component is about to enter the entrance of the wave soldering equipment, the straightening structure performs a final position correction on it.

[0012] Further, the transmission part includes a transmission device penetrating the wave soldering equipment. A fixing frame is fixedly connected to the side of the transmission device. One end of the fixing frame is fixedly connected to the entrance of the wave soldering equipment.

[0013] Further, the limiting structure includes a limiting plate fixedly connected to the top of the inner wall of the fixing frame. Pressing plates are symmetrically arranged at the bottom end of the limiting plate. A connecting rod I is arranged on the side of the pressing plate. The other end of the connecting rod I is provided with a side plate. The other end of the side plate is provided with a limiting block.

[0014] Further, the length dimension of the limiting plate is greater than the length dimension of the inner wall of the fixing frame. At the bottom end of the part of the limiting plate exceeding the fixing frame, there is a straightening structure. The straightening structure includes a guiding plate at one end of the side plate. A connecting rod II is arranged on the side of the guiding plate. A damping pad is arranged in the area where the bottom end of the limiting plate is located on the guiding plate.

[0015] Further, a rotating shaft is arranged in the middle of one end of the guiding plate. The rotating shaft is rotatably connected to one end of the side plate. The inclination angle of the guiding plate is determined by the telescopic length of the connecting rod II.

[0016] Further, the lower surface of the positioning post is set to be arc-shaped, and a telescopic spring is arranged on the side of the positioning post close to the positioning plate.

[0017] The technical solution provided by the present invention has the following beneficial effects compared with the prior art:

[0018] The present invention is provided with a positioning member. The volatilization of the flux in the preheating zone generates pneumatic disturbance, and the positioning structure applies a light pressure to offset this disturbance, ensuring that the varistor maintains a stable position in the initial stage and laying a good foundation for subsequent soldering. In the soldering zone, the solder is in a fluid state and generates a large impact on the varistor. At this time, the positioning structure increases the pressure for dynamic fixation, which can effectively resist this fluid impact, prevent the resistor from shifting due to external force, and ensure the accuracy of the solder joint position. In the cooling zone, the varistor and the circuit board will contract due to the temperature decrease. The positioning structure continuously applies pressure to suppress the position change caused by the contraction and maintain their close fit, ensuring the stability and reliability of the electrical connection.

[0019] The present invention is provided with a limiting structure. The vibration during transportation and the fact that the through holes in the circuit board are larger than the pin size of the varistor are likely to cause the gradual deviation of the resistor position. The limiting structure restricts the resistor position from the initial stage of transportation, reducing the accumulation of the deviation amount. The limiting structure provides stable support and boundary constraints for the varistor during transportation, reducing the risk of large-angle deviation or even dropping of the resistor due to factors such as vibration. It not only protects the varistor itself but also avoids the interference caused by the resistor shifting or dropping to the subsequent production process, ensuring the continuity and stability of the entire production process.

[0020] The present invention is provided with a straightening structure. Even if there is a certain degree of small deviation during transportation, the straightening structure on the side close to the wave soldering equipment can correct the varistor to the correct position before it enters the wave soldering equipment, avoiding excessive deviation of the subsequent soldering position caused by the previous transportation deviation, and greatly improving the accuracy of the varistor position when entering the wave soldering equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the wave soldering equipment of the embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the separated connection of the positioning structure of the embodiment of the present invention;

[0025] Figure 4Schematic diagram of the positioning member structure according to an embodiment of the present invention;

[0026] Figure 5 Schematic diagram of the transmission device structure according to an embodiment of the present invention;

[0027] Figure 6 Schematic diagram of the limit structure according to an embodiment of the present invention;

[0028] Figure 7 Schematic diagram of the ground of the limit structure according to an embodiment of the present invention.

[0029] The reference numerals in the figure respectively represent: 1, wave soldering equipment; 12, preheating zone; 13, soldering zone; 14, cooling zone; 2, transmission part; 21, transmission device; 22, fixing frame; 3, limit structure; 31, limit plate; 32, pressing plate; 33, connecting rod one; 35, side plate; 36, limit block; 5, straightening structure; 51, guide plate; 52, damping pad; 53, connecting rod two; 6, positioning structure; 61, slide rail; 62, positioning member; 621, sliding frame; 622, elastic sheet; 623, positioning plate; 625, positioning column; 626, telescopic rod. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] The present invention will be further described below with reference to the embodiments. Embodiment

[0032] Please refer to Figures 1-7 , the present invention provides a technical solution for a varistor welding system based on a precise positioning welding structure:

[0033] Refer to Figure 1 and Figure 2 , the welding system includes a transmission part 2 before welding and a wave soldering equipment 1 during welding. The wave soldering equipment 1 is sequentially set as a preheating zone 12, a soldering zone 13 and a cooling zone 14 according to different temperature fields.

[0034] According to IPC standards, the diameter of a circuit board through-hole is typically larger than the pin to ensure smooth insertion. However, this also creates positioning issues, as the gap between the pin and the hole wall can cause the component to move during transport. Furthermore, the ring-shaped structure of the varistor may give it a high center of gravity, making it susceptible to tilting or rotation due to conveyor vibration or mechanical shock. The component may have already shifted before entering the wave soldering equipment 1. Subsequently, under the impact of the wave soldering fluid, the positional uncertainty of the varistor, which has already shifted and not been corrected in time, will be further exacerbated by the fluid impact of the solder during the wave soldering process. This positional shift can cause poor contact between the varistor pins and the pads, resulting in cold or false solder joints, reducing electrical connection reliability and causing intermittent failures. It can also cause welding quality defects such as incomplete solder joints and abnormal solder accumulation, leading to short circuit risks or unstable connections. More seriously, the varistor's installation posture is altered, affecting its response to overvoltage and surge currents, making it unable to properly protect the circuit, significantly reducing the reliability and safety of the circuit system.

[0035] In view of this, the present invention sets a limiting structure 3 in the transmission part 2 to limit the movement of electronic components such as varistors to avoid large position deviation or even falling; a straightening structure 5 is set between the transmission part 2 and the wave soldering equipment 1 to straighten the electronic components before soldering; a positioning structure 6 is set above the inner wall of the wave soldering equipment 1, and the positioning structure 6 applies light pressure to the varistor in the preheating zone 12 to offset the aerodynamic disturbance caused by the volatilization of the flux and realize pre-fixation assistance; the positioning structure 6 applies dynamic fixation to the varistor in the welding zone 13 to resist fluid impact; the positioning structure 6 applies continuous pressure to the varistor in the cooling zone 14 to suppress the shrinkage of the circuit board and maintain the fitting state of the circuit board and the resistor. In the initial state, the bottom end of the positioning structure 6 is higher than the bottom end of the limiting structure 3.

[0036] refer to Figure 2 、 Figure 3 and Figure 4 The positioning member 62 includes a slide 621 that is slidably connected to the inner wall of the slide rail 61, a spring piece 622 is provided on the side of the inner wall of the slide 621, and a positioning plate 623 is slidably connected to the middle of the slide 621. The end of the positioning plate 623 close to the slide rail 61 is fixedly connected to the telescopic rod 626, and the other end of the positioning plate 623 is provided with a positioning column 625. The lower surface of the positioning column 625 is set to an arc shape, and a telescopic spring is provided on the side of the positioning column 625 close to the positioning plate 623.

[0037] When the varistor enters the preheating zone 12 of the wave soldering equipment 1, it first contacts the positioning post 625. The positioning post 625 undergoes elastic deformation to the varistor, and the positioning post 625 gently presses the top surface of the varistor with a primary contact force. This contact force is evenly transmitted through the elastic silicone head to form a pre-fixing constraint. When the circuit board moves to the soldering zone 13, the positioning plate 623 drives the telescopic rod 626 to extend through a pneumatic or electric drive device. The telescopic rod 626 drives the positioning plate 623 to move downward, and the positioning plate 623 drives the positioning post 625 to descend. The positioning post 625 and the rubber layer on its surface form a dynamic balance with the resistor surface. The positioning post 625 gently presses the top surface of the varistor with a secondary contact force to ensure the accuracy of the pins and pads. When the circuit board moves to the cooling zone 14, continuous pressure is applied to maintain a tertiary constant pressure until the temperature of the circuit board drops to an appropriate temperature.

[0038] The physical states of the preheating zone 12, the soldering zone 13, and the cooling zone 14 vary greatly. In the preheating zone 12, the flux volatilizes to generate pneumatic disturbances. The positioning structure 6 applies a light pressure to offset this disturbance, ensuring that the varistor maintains a stable position at the initial stage and laying a good foundation for subsequent soldering. In the soldering zone 13, the solder is in a fluid state, generating a large impact on the varistor. At this time, the positioning structure 6 increases the pressure for dynamic fixation, which can effectively resist this fluid impact, prevent the resistor from shifting due to external forces, and ensure the accuracy of the solder joint position. In the cooling zone 14, the varistor and the circuit board will shrink due to the temperature drop. The positioning structure 6 continuously applies pressure to suppress the position change caused by the shrinkage, maintain their close fit, and ensure the stability and reliability of the electrical connection.

[0039] Through precise positioning restrictions for different regions, each varistor can be properly constrained at each key stage of soldering. This standardizes the soldering process of each varistor, reduces soldering defects caused by position deviation, such as cold solder joints, false solder joints, and insufficient solder joints, thereby significantly improving the overall soldering quality consistency of the product and reducing the defective rate.

[0040] Avoid damaging the internal structure of the varistor during soldering due to excessive external force or unstable position, which may affect its electrical performance. Reasonable positioning restrictions ensure that the resistor is soldered in a suitable environment, maintaining its original varistor characteristics and ensuring that it can normally perform the function of protecting the circuit in actual circuit applications.

[0041] In the production process of inserting electronic components, it is relatively common to place a fixing plate on the circuit board after the insertion is completed to achieve the positioning of the circuit board. However, due to the different sizes of electronic components, when using a fixing plate, there may be gaps around other electronic components that are different from the size of the largest electronic component, resulting in loose fixation. During transmission, due to the vibration of the transmission part 2 and the influence of other external factors, these inaccurately positioned electronic components are prone to position deviation. At the same time, the fixing plate is rigidly connected to the circuit board. When the circuit board vibrates due to transmission, the fixing plate will also vibrate accordingly, which further exacerbates the unstable state of the electronic components, making them more likely to shift or even fall off;

[0042] When electronic components vibrate and shift during transmission, it will cause them to be unable to be accurately soldered to the predetermined position during soldering, resulting in soldering defects such as false soldering and missed soldering. If the varistor shifts, the alignment between its pins and the circuit board pads will deviate, and only part of the pins may contact the solder, thus forming false soldering, affecting the electrical performance and stability of the circuit; Component deviation requires manual readjustment or rework of products with poor soldering, increasing production time and labor costs; Moreover, frequent manual intervention will disrupt the production process and reduce the overall production efficiency; If a large number of products have soldering problems caused by component deviation, it may be necessary to suspend the production line for adjustment and repair, further affecting the production progress; In addition to the increase in labor costs, the damage of components and the scrapping of circuit boards due to poor soldering will also increase, thus increasing the raw material costs; At the same time, in order to detect and repair these problem products caused by component deviation, more detection equipment and resources need to be invested, also increasing the production costs; Inaccurate soldering and component position deviation may cause the product to have faults such as unstable performance, short circuit, and open circuit during use, reducing the reliability and service life of the product. In view of this, the present invention provides a limiting structure 3 before entering the wave soldering equipment 1.

[0043] Reference Figure 5 , Figure 6 and Figure 7, the transmission part 2 is located on the side of the wave soldering equipment 1. The transmission part 2 includes a transmission device 21 that penetrates the wave soldering equipment 1. A fixing frame 22 is fixedly connected to the side of the transmission device 21. One end of the fixing frame 22 is fixedly connected to the entrance of the wave soldering equipment 1. A limiting structure 3 is provided at the top end of the inner wall of the fixing frame 22. A straightening structure 5 is provided at one end of the limiting structure 3 close to the wave soldering equipment 1. When the component is about to enter the entrance of the wave soldering equipment 1, the straightening structure 5 performs final position correction and attitude adjustment on it. The limiting structure 3 includes a limiting plate 31 fixedly connected to the top end of the inner wall of the fixing frame 22. Pressure plates 32 are symmetrically arranged at the bottom end of the limiting plate 31. A connecting rod 33 is arranged on the side of the pressure plate 32. The other end of the connecting rod 33 is provided with a side plate 35. The other end of the side plate 35 is provided with a limiting block 36. The length dimension of the limiting plate 31 is greater than the length dimension of the inner wall of the fixing frame 22.

[0044] According to the position and size of the varistor, adjust the length of the first connecting rod 33 so that the size between the side plates 35 meets the requirements of the limit. The side plates 35 provide a clear moving path for the electronic components, which can effectively guide the components of different sizes to move in a predetermined direction, initially restrict their positions, reduce the position deviation caused by factors such as transmission vibration and inertia, improve the position accuracy when entering subsequent processing links such as welding, and lay a foundation for precise processing. By reasonably designing the width of the track through the first connecting rod 33, it can adapt to electronic components in different size ranges. Whether it is small resistors and capacitors or larger integrated circuit modules, they can all obtain effective position guidance in the guiding track, greatly improving the versatility and flexibility of production, and reducing the trouble of frequently replacing tooling due to component size differences. The limit block 36 is made of elastic silica gel, and its hemispherical design provides a buffering effect when it contacts the electronic components. During the movement of the components along the side plates 35, even if a collision occurs, the limit block 36 can absorb the impact force and prevent the components from being damaged due to hard collision. Especially for some components with fragile shells and easily deformable pins, the protection effect is significant, effectively reducing the defective rate of the products. The elasticity of the silica gel enables it to automatically adjust the contact state according to the shape and size of the components. For components with irregular shapes, the hemispherical limit block 36 can fit its surface, apply a uniform acting force, and push the components towards the center position to achieve adaptive preliminary positioning, which is difficult for many rigid structures to achieve, effectively improving the accuracy and reliability of positioning. The uniformly and equally spaced limit blocks 36 can apply a uniform and continuous acting force to the electronic components during their movement, which helps to ensure that the components can stably and accurately converge towards the center position within the limited space of the side plates 35, effectively maintaining the stability and consistency during their dynamic approaching process, avoiding position deviation or rotation caused by uneven force, and ensuring the consistency of the positioning effect. No matter what the initial position of the components in the track is, a relatively stable positioning correction can be obtained. At the same time, the uniformly and equally spaced design makes the entire structure have good regularity, and during maintenance and replacement, the operation is more convenient. The staff can quickly identify and locate the components that need to be maintained, and can accurately install them according to this regularity, reducing the maintenance cost and time, and improving the usability and production efficiency of the production equipment.

[0045] Both the vibration during transportation and the fact that the through-hole of the circuit board is larger than the pin size of the varistor are likely to cause the gradual deviation of the resistor position. The limiting structure 3 restricts the resistor position from the initial stage of transportation, reducing the accumulation of the deviation amount.

[0046] The limiting structure 3 provides stable support and boundary constraints for the transportation of the varistor, reducing the risk of large-angle deviation or even dropping of the resistor due to factors such as vibration. This not only protects the varistor itself but also avoids interference with the subsequent production process caused by resistor displacement or dropping, ensuring the continuity and stability of the entire production process.

[0047] However, the limiting structure 3 mainly restricts the large-scale movement of the component during transportation, but may not be able to precisely control the minute position deviation and attitude change of the component. In actual production, despite the limiting structure 3, factors such as vibration generated by the conveying equipment, differences in the characteristics of the components themselves, and changes in the transmission speed may still cause the component to have a position deviation or incorrect attitude before reaching the entrance of the wave soldering equipment 1. In view of this, the present invention provides a rectifying structure 5. The rectifying structure 5 can perform final position correction and attitude adjustment on the component when it is about to enter the entrance of the wave soldering equipment 1, ensuring that the component enters the preheating zone 12 in the best state, further improving the positioning accuracy, and ensuring the accurate position and attitude of the component when it enters the wave soldering equipment 1.

[0048] Reference Figure 5 、 Figure 6 and Figure 7 As shown in

[0049] FIG.

[0050] The combination of the guide plate 51 and the damping pad 52 can adapt to varistors of different sizes and shapes. The opening width and depth of the guide plate 51 can be designed according to the common varistor sizes, while the elasticity of the damping pad 52 can be automatically adjusted within a certain range to adapt to varistors of different specifications, improving the versatility and adaptability of the entire positioning system; the damping pad 52 can play a buffering role during the pre-positioning process, reducing the collision and friction between the varistor and the guide plate 51, avoiding damage to the varistor, and protecting the integrity of the electronic components. Especially for some relatively fragile varistors, the buffering and protection effect is more important; the setting of the straightening structure 5 simplifies the design and operation of the positioning structure 6. Before the formal positioning, through the pre-positioning of the guide plate 51 and the damping pad 52, the design difficulty of the positioning structure 6 and the requirement for accuracy can be reduced, and at the same time, the adjustment time and complexity during the positioning process are also reduced, improving the efficiency of the entire welding process.

[0051] Even if there is a certain degree of small offset during transportation, the straightening structure 5 on the side close to the wave soldering equipment 1 can correct the varistor to the correct position before it enters the wave soldering equipment 1, avoiding excessive deviation of the subsequent welding position caused by the previous transportation offset, and greatly improving the accuracy of the varistor position when entering the wave soldering equipment 1.

[0052] Compared with only setting the limit structure 3, adding the straightening structure 5 can more accurately control the position and posture of the component. This means that the alignment between the component pins and the circuit board pads is higher, and during welding, it can ensure that the solder evenly wraps the pins, reducing welding defects such as virtual soldering, missed soldering, and short circuits, thereby improving the electrical performance and reliability of the product.

[0053] The straightening structure 5 can adjust the component to the best welding posture, enabling it to evenly withstand the force of the solder wave during the wave soldering process, avoiding damage to the component due to improper position and posture, such as pin deformation and component body cracking, and reducing the defective rate of the product.

[0054] Only setting the limit structure 3 may cause fluctuations in the welding quality due to the certain uncertainty in the position and posture of the component at the wave soldering entrance. After adding the straightening structure 5, the position and posture of the component can be precisely controlled, making the wave soldering process more stable, improving the consistency and stability of the product quality, and being conducive to large-scale production and quality control.

[0055] The straightening structure 5 and the limit structure 3 work together, reducing the manual inspection and adjustment work of the varistor position before wave soldering, and improving the production efficiency. At the same time, due to the reduction of welding defective products caused by the resistor position problem, the subsequent rework cost is reduced, optimizing the production process as a whole and improving the economic benefits of the enterprise.

[0056] This design creates a structural system covering limiting, straightening, and positioning functions for the varistor welding process, comprehensively ensuring the welding position accuracy of varistors and improving welding quality and efficiency. The limiting structure 3 prevents varistors from shifting or falling during transmission; the straightening structure 5 precisely straightens varistors before entering the wave soldering; the positioning structure 6 applies different pressures according to the requirements of different areas of the wave soldering to ensure welding quality.

[0057] In terms of the positioning accuracy of the entire process, through multi-stage precise positioning, starting from the limiting of the transmission part 2, through the straightening between the transmission and the wave soldering inlet, to the differential positioning restriction in different areas within the wave soldering equipment 1, combined with the real-time feedback and adjustment of sensors, the positioning accuracy is greatly improved; in terms of suppressing multi-physical field coupling interference, for thermal fields, flow fields, and possible electric and magnetic field interferences, measures such as primary pressure application in the preheating zone 12, dynamic fixation in the welding zone 13, and continuous pressure application in the cooling zone 14 are adopted to effectively suppress interference; in terms of production flexibility and cost optimization, production flexibility is achieved by relying on the limiting structure 3 and the straightening structure 5, the equipment cost is reduced by virtue of simple mechanical structures and mature control technologies, and the production cost is reduced by reducing defective products through high-precision positioning; in terms of enhancing reliability and controlling failure risks, the welding reliability is improved through precise positioning, and the failure risk is reduced by means of comprehensive protection measures for components; in terms of the engineering application benefits, the production efficiency is improved by increasing the positioning accuracy and reducing the defective product rate, the product quality is improved by virtue of good welding quality and component reliability, and the equipment maintenance cost is reduced by relying on simple designs. Compared with the existing technology through multi-physical field collaborative control and intelligent adaptive mechanisms, three breakthrough advantages of accuracy leap, improvement of solder joint life and seismic performance, and economic reconstruction are achieved.

[0058] This system can be connected to the component inserter to achieve seamless docking. After inserting one type of component, the circuit board can immediately enter the soldering process, and then cycle and transfer back to the component inserter to insert the next component and perform subsequent soldering, greatly improving production efficiency, reducing manual intervention and equipment idle time, achieving smooth operation of automated production, ensuring production continuity, and significantly increasing the output per unit time. At this time, the limit structure 3 and the positioning structure 6 can be adaptively adjusted according to the size and position of the inserted component. No matter what size and position of the component is inserted by the component inserter, the subsequent soldering process can be accurately matched. This adaptive ability can effectively meet the soldering requirements of different components. Compared with the traditional fixed structure, it greatly improves the positioning accuracy, reduces soldering defects caused by positioning deviation, and ensures the stability of soldering quality. By cooperating with the component inserter, the same set of structural system can handle the soldering work of multiple different-sized components. Enterprises do not need to separately configure complex soldering equipment for each type of component, reducing equipment procurement costs and floor space. At the same time, it can quickly respond to changes in market demand for different products, flexibly adjust production tasks, achieve flexible production, and enhance the competitiveness of enterprises in the market. The entire production process forms an efficient closed-loop, with the component insertion and soldering processes closely integrated. It reduces the turnover time and handling times of the circuit board between different processes, reduces the risk of component damage caused by human factors such as handling, and also simplifies the production management process, facilitating quality control and production scheduling by enterprises, and further improving production efficiency and product quality.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A varistor welding system based on a precise positioning welding structure, characterized in that, include: A wave soldering device (1), wherein the interior of the wave soldering device (1) is divided into a preheating zone (12), a welding zone (13) and a cooling zone (14) from left to right according to different functions, a positioning structure (6) for applying different degrees of pressure to a varistor is provided above the inner wall of the wave soldering device (1), the positioning structure (6) comprises a slide rail (61) fixedly connected to the upper inner wall of the wave soldering device (1), a positioning member (62) is slidably connected to the inner wall of the slide rail (61), the positioning member (62) applies different pressures to the varistor in the preheating zone (12), the welding zone (13) and the cooling zone (14), the positioning member (62) comprises a positioning column (625) in contact with the varistor, a positioning plate (623) is provided at one end of the positioning column (625) close to the slide rail (61), and the positioning plate (623) drives the positioning column (625) to move to apply different pressures to the varistor; A transmission part (2), the transmission part (2) is located on the side of the wave soldering equipment (1), a limiting structure (3) is provided inside the transmission part (2), and in an initial state, the bottom end of the positioning column (625) is higher than the bottom end of the limiting structure (3); The positioning member (62) further includes a slide (621) slidably connected to the inner wall of the slide rail (61), a spring piece (622) is provided on the side of the inner wall of the slide (621), the middle portion of the slide (621) is slidably connected to the outer wall of the positioning plate (623), and the end of the positioning plate (623) close to the slide rail (61) is fixedly connected to a telescopic rod (626); Wherein, a straightening structure (5) is provided at one end of the limiting structure (3) close to the wave soldering equipment (1), and the straightening structure (5) performs a final position correction on the component when the component is about to enter the entrance of the wave soldering equipment (1).

2. The varistor welding system based on the precise positioning welding structure according to claim 1, characterized in that: The transmission part (2) includes a transmission device (21) that passes through the wave soldering equipment (1), a fixing frame (22) is fixedly connected to the side of the transmission device (21), and one end of the fixing frame (22) is fixedly connected to the entrance of the wave soldering equipment (1).

3. The varistor welding system based on the precise positioning welding structure according to claim 2, characterized in that: The limiting structure (3) includes a limiting plate (31) fixedly connected to the top of the inner wall of the fixing frame (22), a pressure plate (32) is symmetrically arranged at the bottom end of the limiting plate (31), a connecting rod (33) is arranged on the side of the pressure plate (32), a side plate (35) is arranged at the other end of the connecting rod (33), and a limiting block (36) is arranged at the other end of the side plate (35).

4. The varistor welding system based on the precise positioning welding structure according to claim 3, characterized in that: The length of the limiting plate (31) is greater than the length of the inner wall of the fixing frame (22). A straightening structure (5) is provided at the bottom end of the limiting plate (31) that extends beyond the fixing frame (22). The straightening structure (5) includes a guide plate (51) located at one end of the side plate (35). A second connecting rod (53) is provided on the side of the guide plate (51). A damping pad (52) is provided at the bottom end of the limiting plate (31) in the area of the guide plate (51).

5. The varistor welding system based on the precise positioning welding structure according to claim 4, wherein: A rotating shaft is provided in the middle of one end of the guide plate (51), and the rotating shaft is rotatably connected to one end of the side plate (35). The inclination angle of the guide plate (51) is determined by the telescopic length of the second connecting rod (53).

6. The varistor welding system based on a precise positioning welding structure according to claim 1, characterized in that: The lower surface of the positioning post (625) is arranged to be arc-shaped, and a telescopic spring is arranged on one side of the positioning post (625) close to the positioning plate (623).

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