A circuit board welding fixture

Abstract

The invention relates to a circuit board welding fixture in the technical field of welding fixtures, comprising a circuit board and an automatic clamp, wherein a side platform is arranged on the automatic clamp, a plurality of evenly distributed cracks are opened on the side platform, wing bags are arranged in the cracks, a circular groove is opened in the middle of the automatic clamp, a quality-changing soft bag is arranged inside the circular groove, a guide groove is arranged at the bottom of the automatic clamp, a circulation pipe is arranged in the guide groove, the circulation pipe extends through and extends into the plurality of cracks in sequence, and the circulation pipe is communicated with the wing bags inside the cracks, the circulation pipe is connected with an air intake pipe, and the air intake pipe is connected to an external gas cylinder, a bearing frame is arranged at the bottom of the automatic clamp, a motor is arranged at the center of the bearing frame, a driving rod of the motor penetrates the bearing frame and extends and is fixed to the center of the bottom end of the automatic clamp, the clamping area in the process of circuit board welding is flexibly adjusted by the expanded wing bag, and the arms of personnel suspended in the air for a long time are effectively supported to prevent the personnel from being scalded and the electrical components from being abutted, thereby ensuring the welding quality.

Description

Technical Field

[0001] The invention relates to the technical field of welding fixtures, and in particular to a circuit board welding fixture. Background Art

[0002] Circuit boards, also known as printed circuit boards, can miniaturize and visualize circuits, playing a vital role in the mass production of fixed circuits and optimizing the layout of electrical appliances. Circuit boards, also known as printed circuit boards (PCBs), are categorized by the number of layers into three broad categories: single-sided, double-sided, and multi-layer boards. Multi-layer boards are a product of the development of electronic information technology toward high speed, multi-function, high capacity, compact size, thinness, and lightweight. However, soldering a circuit board requires clamping and securing it. Existing techniques typically employ multiple clamps for this purpose. However, due to the thinness and brittleness of circuit boards, rigid clamps can easily break them due to excessive clamping force. Furthermore, the clamping method compromises the board's mobility, making it difficult to perform multi-position soldering operations.

[0003] The specification of Chinese patent CN111604564A discloses a fixing fixture for circuit board welding, including a table top, a fixing frame provided on the top of the table top, a square opening provided on the surface of the fixing frame, a fixed block and a movable block provided inside the square opening, the fixed block and the movable block are both made of strip-shaped flexible material, a strip groove is provided on the sides of the fixed block and the movable block that are close to each other, the fixed block is fixedly connected to the side wall of the square opening, the movable block is slidably connected to the side wall of the square opening, and a movable movable block is used to abut and clamp one end of the circuit board.

[0004] The specification of Chinese patent CN108788377A discloses a circuit board welding fixture, including a circuit board fixing mechanism that is sleeved on a column and located above a heat dissipation fan. The circuit board fixing mechanism can slide up and down on the column. The first sliding block and the second sliding block are both provided with a fixed sliding rod and a movable sliding rod. The fixed sliding rod is fixed to the first sliding block, and the movable sliding rod passes through the first sliding block and can slide back and forth on the first sliding block. A slider is provided at one end of the movable sliding rod, and the fixed sliding rod passes through the slider. The circuit board is placed between the first sliding block and the second sliding block, thereby clamping and fixing the circuit board.

[0005] A fixing fixture for circuit board welding uses a movable active block to abut and clamp one end of the circuit board. A circuit board welding fixture places the circuit board between a first sliding block and a second sliding block to clamp and fix the circuit board. However, it still has certain limitations. For example, it can only clamp circuit boards with square structures and cannot meet the clamping requirements of special-shaped circuit boards. The clamping force is too large and it is easy to damage the circuit board. The clamping and disassembly convenience is low. In addition, when welding, the hands of the personnel are kept in the air for a long time, causing numbness and affecting the welding quality. Or the personnel are easily burned by the high temperature of the solder. Summary of the Invention

[0006] In view of the above-mentioned existing technologies, the technical problem to be solved by the present invention is how to flexibly adjust the clamping force and clamping area during the circuit board welding process, effectively support the personnel's arms that are suspended in the air for a long time, prevent the personnel from being burned, and abut against the electrical components to prevent them from falling off, thereby ensuring the welding quality.

[0007] In order to solve the above problems, the present invention provides a circuit board welding fixture, including a circuit board and an automatic clamp, wherein the automatic clamp is provided with a side platform, the side platform is provided with a plurality of evenly distributed grooves, wing bags are provided in the cracks, a circular groove is provided in the middle of the automatic clamp, a quality-changing soft bag is provided inside the circular groove, a guide groove is provided at the bottom of the automatic clamp, a circulation tube is provided in the guide groove, the circulation tube extends through and extends into the plurality of grooves in sequence, and is connected with the wing bags inside the cracks, the circulation tube is connected with an air intake pipe, and the air intake pipe is connected to an external gas cylinder, a supporting frame is provided at the bottom of the automatic clamp, a motor is provided at the center of the supporting frame, a driving rod of the motor passes through the supporting frame and extends and is fixed to the bottom center of the automatic clamp; the motor at the bottom can drive the automatic clamp to rotate, so that personnel can achieve flexible angle adjustment when welding different positions of the circuit board, without the need for personnel to walk back and forth to find the welding direction, and the practicality is high.

[0008] Preferably, the self-control clamp is a conical structure with a concave middle part, and the self-control clamp is made of hard material, the depth of the circular groove is half of the depth of the self-control clamp, and the radius of the circular groove is one third of the radius of the self-control clamp; by opening a circular groove in the middle of the self-control clamp, it can accommodate a mass-changing soft bag filled with electrorheological fluid, so that the mass-changing soft bag abuts against the electrical components on the top, effectively preventing the pins from loosening during welding, causing the welding position to tilt, or even the electrical components to fall off.

[0009] Preferably, the quality-changing soft bag is made of a flexible rubber material and is filled with an electrorheological fluid, and the quality-changing soft bag is in a slightly raised state; the pins of the electrical components are inserted into the holes of the circuit board, and when welding the back side of the circuit board, the electrorheological fluid is energized to change it from liquid to solid, so that the raised quality-changing soft bag can abut against the lower surface of the electrical component, preventing the pins from loosening and falling off when welding on the front side.

[0010] Preferably, multiple annularly distributed cracks are T-shaped structures, the interior of the wing bag is filled with plastic material, the wing bag is inflated and expanded into a T-shaped structure, and the wing bag is made of transparent elastic rubber material. The wing bag is completely stored in the T-shaped crack when not in use. When the circuit board needs to be clamped, the wing bag is inflated, and the T-shaped wing bag filled with plastic material quickly expands and expands, overflows the crack, and is pressed on the surface of the circuit board, flexibly clamping and positioning the circuit board. The pressing area can be flexibly adjusted according to the expansion size of the wing bag, and the expanded wing bag can support the person's hands, effectively alleviating the soreness and numbness caused by long-term suspension, and also reducing the risk of the person's hands being burned by high-temperature tin wire.

[0011] Preferably, the circuit board is welded with electrical components, and the circuit board is placed on the upper surface of the side table, and the bottom of the circuit board is in contact with the soft pack; placing the circuit board directly on the side table can not only fix the round circuit board, but also clamp square, triangular and other special-shaped circuit boards in all directions. It has strong applicability and is easy to take out. There is no need for manual screwing of bolts, which saves time and effort.

[0012] Preferably, the circulation tube is nested inside the guide groove, and the circulation tube is a transparent rubber hose. An electromagnetic valve is provided at the connection between the air inlet pipe and the external gas cylinder, and the external gas cylinder is filled with colored gas. The circulation tube can quickly transport the colored gas in the gas cylinder to the wing bag, so that it expands, deforms and is pressed onto the surface of the circuit board. The transparent circulation tube and wing bag can facilitate personnel to observe the filling and transportation of the gas, and the filling of colored gas can assist personnel in intuitively judging whether there is a leak in the wing bag.

[0013] In summary, this solution has the following beneficial effects:

[0014] 1. The clamping area can be flexibly adjusted. When it is necessary to weld the front of the circuit board, place the circuit board on the upper surface of the side table, open the solenoid valve, and allow the external gas cylinder to quickly supply gas to the circulation tube. The colored gas in the circulation tube will quickly reach the inside of the wing bag, and the filled and expanded wing bag will extend out of the crack and expand into a T-shape, so that multiple wing bags are pressed against the surface of the circuit board. When it is necessary to increase the clamping area, it is only necessary to continue to inflate the wing bag, thereby changing the size of the wing bag, so that the pressing area of ​​the circuit board can be controlled. The filling of colored gas can make it easier for personnel to observe the filling of the wing bag and determine whether there is a leak in the wing bag. In addition, placing the circuit board directly on the side table can not only fix round circuit boards, but also clamp square, triangular and other special-shaped circuit boards in all directions. It has strong applicability and is easy to take.

[0015] 2. Support the hands of personnel. Since there are many electrical components on the surface of the circuit board, personnel need to hold the welding gun for a long time. Suspended welding can easily lead to fatigue of the personnel's hands, discomfort or shaking, which in turn affects the welding quality of the circuit board. In the present invention, when the wing bags around the side table quickly expand and unfold into a T-shaped structure, personnel can place their hands on the upper surface of the wing bags, thereby effectively supporting the numb hands and assisting personnel in welding operations. The flexible wing bags can not only flexibly clamp the circuit board without damaging the board, but also improve the comfort of placing hands and welding efficiency.

[0016] 3. Reduce the risk of hand burns from high temperatures. During the long soldering process of circuit boards, hand fatigue can cause accidental contact with the hot solder wire that has just been soldered, resulting in the risk of burns. In addition, circuit boards with many electrical components soldered on them require extra care. Once the hands move too much, the pins will be pulled and break. In the present invention, the user places the elbow on the wing bag, which greatly reduces the risk of accidental burns and prevents the user's hands from pressing the board together and pulling the electrical components, thus improving safety.

[0017] 4. Abut the electrical components to prevent them from falling off. When welding is required on the back of the circuit board, a large number of electrical component pins are passed through the holes of the circuit board, and the circuit board is turned over so that the pins face upward. During the welding process, due to the large number of pins, they can only be welded one by one. Therefore, the unsoldered pins are very likely to become loose, resulting in the movement of the welding position, affecting the welding quality, and even causing the pins to break and the electrical components to fall off. In the present invention, the electrorheological fluid filled in the soft bag is energized, so that the electrorheological fluid is transformed from liquid to solid, thereby abutting the raised part of the soft bag against the surface of the electrical component, so that each pin is at the same level, and there will be no misalignment or unevenness. The personnel can also loosen their hands to pick up the electrical components, freeing up manpower.

[0018] 5. Adjustable circuit board welding angle. When clamping and welding circuit boards, multiple clamps are usually used to fix them. When welding electrical components in different positions, personnel need to move back and forth. However, the present invention only needs to use the motor at the bottom to drive the automatic clamp to rotate, thereby flexibly changing the welding direction and angle of the circuit board. There is no need for personnel to move around, and the welding efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the automatic clamp;

[0021] Figure 3 This is a schematic diagram of the circuit board placement status;

[0022] Figure 4 This is a schematic diagram of the bottom structure of the automatic clamp;

[0023] Figure 5 Schematic diagram of the load-bearing frame structure;

[0024] Figure 6 This is a schematic diagram of the T-shaped state of the wing bag being deployed;

[0025] Figure 7 This is a schematic diagram of the wing bag pressed state;

[0026] Figure 8 This is a schematic diagram of the wing sac being fully inflated;

[0027] Figure 9 This is a schematic diagram of circuit board welding in the prior art;

[0028] Figure 10 This is a schematic diagram of the hand state when soldering a circular circuit board;

[0029] Figure 11 This is a schematic diagram of the hand state when soldering a square circuit board;

[0030] Figure 12 Schematic diagram of the soft pack abutment state.

[0031] Description of the numbers in the figure:

[0032] 1. Circuit board; 2. Automatic clamp; 3. Side platform; 4. Crack; 5. Quality change soft bag; 6. Wing bag; 7. Circulation pipe; 8. Intake pipe; 9. Carrier; 10. Motor; 11. Electrical components. DETAILED DESCRIPTION

[0033] The following describes the implementation of the present application in detail with reference to the accompanying drawings. Example

[0034] Figure 1-12The figure shows a circuit board welding fixture, including a circuit board 1 and an automatic clamp 2, a side table 3 is provided on the automatic clamp 2, a plurality of evenly distributed cracks 4 are opened on the side table 3, a wing bag 6 is provided in the crack 4, a circular groove is opened in the middle of the automatic clamp 2, a quality-changing soft bag 5 is provided inside the circular groove, a guide groove is provided at the bottom of the automatic clamp 2, a circulation pipe 7 is provided in the guide groove, the circulation pipe 7 extends through the plurality of cracks 4 in sequence, and the circulation pipe 7 is connected to the wing bag 6 inside the crack 4, and the circulation pipe 7 is connected to the wing bag 6 inside the crack 4. It is connected to an air intake pipe 8, which is connected to an external gas cylinder. A carrier frame 9 is provided at the bottom of the automatic clamp 2, and a motor 10 is provided at the center of the carrier frame 9. The driving rod of the motor 10 passes through the carrier frame 9 and extends and is fixed to the bottom center of the automatic clamp 2; the motor 10 at the bottom can drive the automatic clamp 2 to rotate, so that personnel can achieve flexible angle adjustment when welding different positions of the circuit board 1, without the need for personnel to walk back and forth to find the welding position, and the practicality is high.

[0035] Figure 2 and Figure 12 As shown, the self-control clamp 2 is a truncated cone structure with a concave center, and the self-control clamp 2 is made of a hard material. The depth of the circular groove is half of the depth of the self-control clamp 2, and the radius of the circular groove is one-third of the radius of the self-control clamp 2. By providing a circular groove in the middle of the self-control clamp 2, it can accommodate the electrorheological fluid-filled soft bag 5, so that the electrorheological fluid-filled soft bag 5 abuts against the electrical component 11 on the top, effectively preventing the pins from loosening during welding, causing the welding position to tilt, or even the electrical component 11 to fall off.

[0036] Figure 12 As shown, the quality change soft bag 5 is made of a flexible rubber material and is filled with an electrorheological fluid. The quality change soft bag 5 is in a slightly raised state. The pins of the electrical component 11 are inserted into the holes of the circuit board 1. When soldering the back side of the circuit board 1, the electrorheological fluid is energized to change it from liquid to solid, so that the raised quality change soft bag 5 can abut against the lower surface of the electrical component 11, preventing the pins from loosening and falling off when soldering on the front side.

[0037] Figure 2 、 Figure 6 and Figure 10As shown, a plurality of annularly distributed cracks 4 are T-shaped structures, and the interior of the wing bag 6 is filled with a plastic material. The wing bag 6 is expanded into a T-shaped structure after being inflated, and the wing bag 6 is made of a transparent elastic rubber material. The wing bag 6 is completely stored in the T-shaped crack 4 when not in use. When the circuit board 1 needs to be clamped, the wing bag 6 is inflated, and the T-shaped wing bag 6 filled with the plastic material quickly expands and expands, overflows the crack 4, and is pressed onto the surface of the circuit board 1, flexibly clamping and positioning the circuit board 1. The pressing area can be flexibly adjusted by the expansion size of the wing bag 6, and the expanded wing bag 6 can support the person's hand, effectively alleviating the soreness and numbness caused by long-term suspension, and also reducing the risk of the person's hand being burned by the high temperature of the tin wire;

[0038] The circuit board 1 is welded with electrical components 11, and the circuit board 1 is placed on the upper surface of the side table 3. The bottom of the circuit board 1 is in contact with the soft pack 5. The circuit board 1 is directly placed on the side table 3. It can not only fix the circular circuit board 1, but also clamp the square, triangular and other special-shaped circuit boards 1 in all directions. It has strong applicability and is easy to take out. There is no need to manually tighten the bolts, which saves time and effort.

[0039] Figure 4 It is shown that the circulation tube 7 is nested inside the guide groove, and the circulation tube 7 is a transparent rubber hose. An electromagnetic valve is provided at the connection between the air inlet pipe 8 and the external gas cylinder. The external gas cylinder is filled with colored gas. The colored gas in the gas cylinder can be quickly transported to the wing bag 6 through the set circulation tube 7, so that it expands, deforms and is pressed on the surface of the circuit board 1. The transparent circulation tube 7 and the wing bag 6 can facilitate personnel to observe the filling and transportation of the gas. The filling of colored gas can help personnel intuitively judge whether there is a leak in the wing bag 6.

[0040] In the present invention, when it is necessary to weld the front side of the circuit board 1, the circuit board 1 is placed on the upper surface of the side table 3, and the solenoid valve is opened, so that the external gas cylinder quickly supplies gas to the circulation tube 7, and the colored gas in the circulation tube 7 will quickly reach the inside of the wing bag 6. The filled and expanded wing bag 6 will extend out of the crack 4 and expand into a T-shape, so that multiple wing bags 6 are pressed against the surface of the circuit board 1. When it is necessary to increase the clamping area, it is only necessary to continuously inflate the wing bag 6, thereby changing the volume of the wing bag 6, so that the pressing area of ​​the circuit board 1 can be controlled. The filling of the colored gas can make it easy for personnel to observe the filling status of the wing bag 6 and to judge whether the wing bag 6 has a leakage problem. In addition, placing the circuit board 1 directly on the side table 3 can not only fix the circular circuit board 1, but also clamp square, triangular and other special-shaped circuit boards 1 in all directions, with strong applicability and high convenience in taking.

[0041] Since there are many electrical components 11 on the surface of the circuit board 1, the operator needs to hold the welding gun for a long time. The suspended welding can easily cause fatigue of the operator's hands, discomfort or shaking, and thus affect the welding quality of the circuit board 1. In the present invention, when the wing bags 6 around the side table are rapidly expanded and unfolded into a T-shaped structure, the operator can place his hands on the upper surface of the wing bags 6, thereby effectively supporting the numb hands and assisting the operator in the welding operation. The flexible wing bags 6 can not only flexibly clamp the circuit board 1 without damaging the board, but also improve the comfort of the hands and the welding efficiency.

[0042] During the long soldering process of the circuit board 1, due to hand fatigue, the user's hands may accidentally touch the hot solder wire that has just been soldered, thereby causing the risk of burns. In addition, the circuit board after soldering many electrical components 11 requires special care. Once the hand moves too much, the pins will be pulled and broken. In the present invention, the user rests the elbow on the wing bag 6, which greatly reduces the risk of accidental burns and prevents the user's hands from pressing the board and pulling the electrical components, thereby improving safety.

[0043] When the reverse side of the circuit board 1 needs to be soldered, a large number of pins of the electrical components 11 are passed through the holes of the circuit board 1, and the circuit board 1 is turned over so that the pins face upward. During the soldering process, due to the large number of pins, they can only be soldered one by one. Therefore, the pins that are not soldered are very likely to become loose, resulting in the movement of the soldering position, affecting the soldering quality, and even causing the pins to break and the electrical components 11 to fall off. In the present invention, the electrorheological fluid filled in the soft pack 5 is energized to change the electrorheological fluid from liquid to solid, thereby making the raised portion of the soft pack 5 abut against the surface of the electrical components 11, so that all pins are at the same level, and there will be no misalignment or unevenness. The personnel can also loosen their hands to pick up the electrical components 11, freeing up manpower.

[0044] When clamping and welding the circuit board 1, multiple clamps are usually used to fix it. When electrical components 11 in different positions need to be welded, people need to move back and forth. In the present invention, only the motor 10 at the bottom drives the automatic clamp 2 to rotate, thereby flexibly changing the welding direction and angle of the circuit board 1. There is no need for people to move around, and the welding efficiency is higher.

[0045] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A circuit board welding fixture, comprising a circuit board (1) and an automatic clamp (2), characterized in that: The self-controlled clamp (2) is provided with a side platform (3), the side platform (3) is provided with a plurality of evenly distributed cracks (4), a wing bag (6) is provided in the cracks (4), a circular groove is provided in the middle of the self-controlled clamp (2), a quality-changing soft bag (5) is provided in the circular groove, a guide groove is provided at the bottom of the self-controlled clamp (2), a circulation pipe (7) is provided in the guide groove, the circulation pipe (7) extends through and extends into the plurality of cracks (4) in sequence, and the circulation pipe (7) is connected to the wing bag (6) in the cracks (4), the circulation pipe (7) is connected to an air intake pipe (8), and the air intake pipe (8) is connected to an external gas cylinder, a bearing frame (9) is provided at the bottom of the self-controlled clamp (2), a motor (10) is provided at the center of the bearing frame (9), and a driving rod of the motor (10) passes through the bearing frame (9) and extends to be fixed to the center of the bottom end of the self-controlled clamp (2); The qualitative change soft bag (5) is made of a flexible rubber material, and the qualitative change soft bag (5) is filled with an electrorheological fluid, and the qualitative change soft bag (5) is in a slightly raised state; The plurality of annularly distributed cracks (4) form a T-shaped structure, the wing bag (6) is filled with a shaping material, the wing bag (6) is expanded into a T-shaped structure after being inflated, and the wing bag (6) is made of a transparent elastic rubber material; The circuit board (1) is welded with an electrical component (11), and the circuit board (1) is placed on the upper surface of the side table (3), and the bottom of the circuit board (1) is in contact with the soft package (5); The circulating flow pipe (7) is nested inside the guide groove, and the circulating flow pipe (7) is a transparent rubber hose. A solenoid valve is provided at the connection between the air inlet pipe (8) and the external gas cylinder, and the external gas cylinder is filled with colored gas.

2. A circuit board welding fixture according to claim 1, characterized in that: The self-control clamp (2) is a truncated cone structure with a concave middle portion, and the self-control clamp (2) is made of a hard material. The depth of the circular groove is half of the depth of the self-control clamp (2), and the radius of the circular groove is one third of the radius of the self-control clamp (2).

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