A welding auxiliary positioner, positioning method and application in PCB circuit board welding

Abstract

The present invention relates to the field of welding technology, and discloses a welding auxiliary positioner, a positioning method and an application in PCB circuit board welding. The invention comprises a fixing seat, a receiving groove is provided on the top of the fixing seat, a first positioning component is installed oppositely on the front and rear side walls of the receiving groove, and a second positioning component is installed oppositely on the left and right side walls of the receiving groove. The first positioning component and the second positioning component cooperate to realize the positioning and clamping of the circuit board, and assist the packaging plate in flattening the pins of the component after welding, thereby greatly enhancing the flatness of the pin during the welding operation. In addition, the positioning plate can prevent the pin from being separated from the circuit board when the packaging boss flattens the pin.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, and in particular to a welding auxiliary positioner, a positioning method and applications in PCB circuit board welding. Background Art

[0002] Circuit boards are an important component of modern electronic instruments. The processing quality of circuit boards will directly affect whether electronic instruments can work properly. Existing circuit boards are mainly welded by manual welding or mechanical welding. Existing circuit board welding mainly adopts wave soldering to cope with the production of circuit boards with many solder points and large batches. During welding, the PCB board needs to be positioned by a fixture.

[0003] A positioning tool for soldering with application number CN201521113734.7 adopts a combination of positioning grooves, wiring harness grooves and pressure blocks to fix the PCB circuit board without the need for manual pressing by the operator, which facilitates the welding operation; a PCB board positioning tool and welding device with application number CN202220813776.1 uses positioning pins to guide the PCB board, so that the PCB board will automatically adapt to the positioning area when it is in the positioning section, thereby allowing the PCB board to fall into the positioning area quickly and accurately, thereby ensuring the quality of the subsequent welding shield.

[0004] However, during the finished product assembly and welding process of PCB boards, many electronic components need to be manually soldered on the printed PCB boards, such as potentiometers, pin terminals, transistors, micro switches, etc. During the workers' soldering process, inaccurate soldering position positioning on the PCB board will lead to component soldering misalignment. Since there are many soldering points on the PCB board and the soldering areas on the PCB board cannot be quickly located and distinguished, it is easy for the pins and soldering points to not correspond and cause soldering errors. At the same time, when soldering pins on the PCB board, if the soldering holes are too dense, it is easy for the soldering liquid to extend outward along the PCB board pins, thereby forming solder bridges between the soldering points. Especially when manual soldering is performed, solder bridges are very likely to occur. The existence of solder bridges destroys the original circuit structure on the PCB board, thereby preventing the PCB board from working properly.

[0005] Therefore, the present invention provides a welding auxiliary positioner and positioning method to solve the above problems. Summary of the Invention

[0006] The object of the present invention is to provide a welding auxiliary positioner, a positioning method and an application thereof in PCB circuit board welding, so as to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a welding auxiliary positioner, comprising a fixing base, a receiving slot being formed on the top of the fixing base, pin holes being uniformly distributed on the bottom of the receiving slot extending vertically therethrough, first positioning assemblies being mounted oppositely on the front and rear side walls of the receiving slot, and second positioning assemblies being mounted oppositely on the left and right side walls of the receiving slot;

[0008] The first positioning assembly and the second positioning assembly have the same structural composition, the first positioning assembly includes a guide rod slidably plugged and assembled on a fixed seat, a clamping plate is fixed to the outer end of the guide rod, a guide plate is integrally formed on the top of the clamping plate, a support spring sleeved on the outer side wall of the guide rod is fixedly connected between the clamping plate and the inner side wall of the receiving groove, and a pressure-bearing rubber air bag is sleeved on the outer side of the support spring and fixedly connected between the clamping plate and the inner side wall of the receiving groove;

[0009] The length of the receiving groove is twice its width, and the pressure-bearing rubber air bags in the single group of first positioning components and the single group of second positioning components are connected through an air pipe;

[0010] A slideway running through the top and bottom is provided on the outer edge of the top of the fixing seat. A slide seat is slidably assembled in the slideway. A positioning plate arranged directly above the storage slot is connected between the front and rear slide seats. The positioning plate is evenly distributed with positioning holes corresponding to the pin holes.

[0011] Preferably, the two groups of first positioning components are in direct correspondence with each other, the two groups of second positioning components are in direct correspondence with each other, the slide is opened along the length direction of the fixed seat, and the length of the slide is 1 / 3 of the length of the fixed seat, the positioning plates are in two groups and are symmetrically installed on the left and right sides of the top of the fixed seat, and the positioning plates span the storage slots.

[0012] Preferably, the pin holes are evenly distributed in the receiving groove, and a first thermal expansion ring nested and assembled in the bottom of the receiving groove is provided on the outside of each pin hole, the first thermal expansion ring is flush with the bottom of the receiving groove, and an overflow groove connected to the pin hole is provided at the bottom of the fixing seat and the position corresponding to the pin hole, and a second thermal expansion ring nested and assembled in the bottom of the fixing seat is provided on the outside of each overflow groove.

[0013] Preferably, the first positioning assembly and the second positioning assembly are arranged on the same horizontal plane, the clamping plate is a longitudinally arranged clamping plate, the outer surface of the guide plate is arc-shaped, and the connection between the clamping plate and the guide plate is an arc-shaped transition.

[0014] Preferably, the bottom of each sliding seat is flush with the bottom of the fixed seat, and a support rod is longitudinally slidably inserted in the middle of the bottom of the sliding seat, and the top of each support rod extends out of the top of the sliding seat and is fixedly connected to a limiting plate, and an expansion air bag is connected between the bottom outer edge of each limiting plate and the top of the sliding seat, and the expansion air bag is connected through an air guide tube and a pressure-bearing rubber air bag on the second positioning component, and an electromagnetic valve is fixedly assembled on the air guide tube, and a packaging plate is connected between the bottom ends of the front and rear groups of support rods, and the top of the packaging plate is evenly distributed with packaging bosses corresponding to the pin holes.

[0015] Preferably, the packaging boss is a circular boss, and the outer diameter of the packaging boss is the same as the inner diameter of the second thermal expansion ring.

[0016] The present invention also provides a positioning method for a welding auxiliary positioner, the specific steps of which are:

[0017] S1: When in use, the circuit board is pressed into the storage slot. The circuit board and the two sets of first positioning components first come into contact. The squeezing force of the circuit board on the guide plate overcomes the rebound force of the support spring, causing the two sets of first positioning components to move away from each other, making it easier for the circuit board to be embedded in the storage slot. The rebound of the support spring gives the clamping plate a positioning and clamping force on the circuit board, ensuring that the circuit board is in the middle of the storage slot.

[0018] S2: When the width of the circuit board is not enough to interfere with the second positioning assembly, the gas inside the pressure-bearing rubber air bag of the first positioning assembly in the positioning and compression state will be introduced into the pressure-bearing rubber air bag of the second positioning assembly through the air supply pipe to achieve gas replenishment, causing the pressure-bearing rubber air bag of the second positioning assembly to expand, thereby increasing the distance of the second positioning assembly, causing the second positioning assembly to squeeze and position the side wall of the circuit board, thereby improving the positioning accuracy of the circuit board and preventing uneven distribution on the left and right sides. At the same time, the four sides of the circuit board are synchronously limited to improve the clamping stability of the circuit board;

[0019] S3: When the width of the circuit board is large enough to interfere with the second positioning assembly, the first positioning assembly and the second positioning assembly will be simultaneously in a compressed positioning clamping state. At this time, the internal gas of the pressurized rubber air bags in the first positioning assembly and the second positioning assembly will be introduced into the expansion air bags through the air ducts to achieve gas replenishment, causing the expansion air bags to expand, and the packaging board will be driven up through the support rod to squeeze the bottom of the fixing seat and flatten the welded pins, greatly enhancing the flatness of the pin welding operation.

[0020] The present invention also provides an application of the above-mentioned welding auxiliary positioner in PCB circuit board welding.

[0021] Technical effects and advantages of the present invention:

[0022] 1. The present invention divides the functional areas on the circuit board and utilizes the partition positioning function of the positioning plate during welding to make the positioning of the area to be welded more accurate, making it more convenient to insert the pins of the components, and can prevent the circuit board from being skewed or moved. The correspondence between the positioning holes and the pin holes can reveal the welding position of the area to be welded on the circuit board, so that the welding position on the circuit board can be accurately positioned.

[0023] 2. The internal gas of the pressurized rubber airbag in the first positioning assembly and the second positioning assembly of the present invention will be introduced into the expansion airbag through the air duct to achieve gas replenishment, prompting the expansion airbag to expand, and the packaging plate is driven to move up through the support rod to squeeze the bottom of the fixing seat and flatten the welded pins, thereby greatly enhancing the flatness of the pin welding operation. During this process, the positioning plate does not move and is always in a downward limiting state for the components on the circuit board, preventing the pins from being separated from the circuit board when the packaging boss flattens the pins, thereby greatly improving the safety and welding quality of the component welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front view of the overall structure of the present invention;

[0025] Figure 2 It is a bottom view of the overall structure of the present invention;

[0026] Figure 3 This is a schematic structural diagram of the first positioning assembly of the present invention;

[0027] Figure 4 This is a schematic diagram of the packaging board assembly structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the local structure of the bottom of the fixing seat of the present invention;

[0029] Figure 6 It is a schematic diagram of the cross-sectional structure of the pin hole of the present invention.

[0030] In the figure: 1. fixing seat; 2. storage slot; 3. pin hole; 4. first positioning assembly; 5. second positioning assembly; 6. guide rod; 7. clamping plate; 8. guide plate; 9. support spring; 10. pressure-bearing rubber air bag; 11. positioning plate; 12. positioning hole; 13. slide; 14. slide; 15. packaging plate; 16. support rod; 17. limit plate; 18. expansion air bag; 19. packaging boss; 20. first thermal expansion ring; 21. overflow groove; 22. second thermal expansion ring. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] Example 1:

[0033] like Figures 1 to 6 As shown, this embodiment discloses a welding auxiliary positioner, including a fixing base 1, a receiving slot 2 is provided on the top of the fixing base 1, and the size of the receiving slot 2 is larger than the size of the circuit board, so that circuit boards of different sizes can be accommodated, which is convenient for matching different circuit board welding needs. Pin holes 3 are evenly distributed on the bottom of the receiving slot 2, which are through-through, so that the pin holes 3 and the welding holes on the circuit board can be matched conveniently, so that the pins of the components can be better matched when inserted into the welding holes on the circuit board, and can achieve one-to-one correspondence, greatly improving the positioning accuracy. First positioning components 4 are installed oppositely on the front and rear side walls of the receiving slot 2, and second positioning components 5 are installed oppositely on the left and right side walls of the receiving slot 2. The cooperation between the first positioning component 4 and the second positioning component 5 is used to realize the limited fixation of the circuit board.

[0034] For details, please refer to: Figure 1 and Figure 3 The first positioning assembly 4 and the second positioning assembly 5 have the same structural composition. The first positioning assembly 4 includes a guide rod 6 that is slidably plugged and assembled on the fixed seat 1. The outer end of the guide rod 6 is fixed with a clamping plate 7. The top of the clamping plate 7 is integrally provided with a guide plate 8. The clamping plate 7 is a longitudinally arranged clamping plate. The outer surface of the guide plate 8 is arc-shaped, and the connection between the clamping plate 7 and the guide plate 8 is an arc-shaped transition. The guide plate 8 has a guiding function, which makes it convenient for the circuit board and the guide plate 8 to continue to slide after contact. When the clamping plate 7 clamps the circuit board, the guide plate 8 also has a limiting function on the circuit board to prevent the circuit board from detaching due to misoperation. A support spring 9 is fixedly connected between the clamping plate 7 and the inner wall of the storage groove 2 with a support spring 9 sleeved on the outer wall of the guide rod 6. The outer side of the support spring 9 is sleeved with a pressure-bearing rubber air bag 10 fixedly connected between the clamping plate 7 and the inner wall of the storage groove 2.

[0035] See also Figure 1 The length of the storage groove 2 is twice the width. The pressure-bearing rubber air bag 10 in the single group of first positioning components 4 and the single group of second positioning components 5 are connected through an air pipe. The two groups of first positioning components 4 correspond to each other, and the two groups of second positioning components 5 correspond to each other. The first positioning components 4 and the second positioning components 5 are arranged on the same horizontal plane.

[0036] When in use, the circuit board is pressed into the storage slot 2, and the circuit board and the two groups of first positioning components 4 are first in contact. The squeezing force of the circuit board on the guide plate 8 is used to overcome the rebound force of the support spring 9 so that the two groups of first positioning components 4 move away from each other, which facilitates the circuit board to be embedded in the storage slot 2. The rebound of the support spring 9 is used to give the clamping plate 7 a positioning and clamping force on the circuit board, which can ensure that the circuit board is centered inside the storage slot 2.

[0037] First, when the width of the circuit board is not enough to interfere with the second positioning component 5, it means that the length of the circuit board is not enough, and the second positioning component 5 and the first positioning component 4 cannot clamp the circuit board synchronously. At this time, the first positioning component 4 will give priority to positioning and clamping the circuit board, and then the internal gas of the pressure-bearing rubber air bag 10 of the first positioning component 4 in the positioning and compression state will be introduced into the pressure-bearing rubber air bag 10 of the second positioning component 5 through the air pipe to achieve gas replenishment, prompting the pressure-bearing rubber air bag 10 of the second positioning component 5 to expand to increase the length of the second positioning component 5, prompting the second positioning component 5 to squeeze and position the side wall of the circuit board, improve the positioning accuracy of the circuit board, prevent uneven distribution on the left and right, and at the same time, synchronously limit the four sides of the circuit board to improve the clamping stability of the circuit board.

[0038] When the width of the circuit board is sufficient to interfere with the second positioning component 5, the first positioning component 4 and the second positioning component 5 will be synchronously in a compressed positioning clamping state, so that the circuit board can be clamped and fixed directly by the first positioning component 4 and the second positioning component 5, thereby improving the positioning accuracy.

[0039] See also Figure 1 and Figure 2, a slide 13 is provided on the outer edge of the top of the fixing seat 1, which runs through from top to bottom. A slide 14 is slidably installed in the slide 13. A positioning plate 11 is connected between the front and rear slides 14, which is arranged just above the storage slot 2. Positioning holes 12 corresponding to the pin holes 3 are evenly distributed on the positioning plate 11. The slide 13 is opened along the length direction of the fixing seat 1, and the length of the slide 13 is 1 / 3 of the length of the fixing seat 1. There are two groups of positioning plates 11, which are symmetrically installed on the left and right sides of the top of the fixing seat 1, and the positioning plates 11 span the storage slot 2. After the circuit board is positioned and installed, the components are plugged and assembled according to the corresponding functional areas, so that the pins of the components pass through the welding holes on the circuit board and then pass through the pin holes 3. Before welding, the slide 14 is manually slid so that the positioning holes 12 on the positioning plate 11 correspond to the components on the circuit board, and the components in the welding position can be positioned through the positioning plate 11. The pins of the components can be inserted more conveniently during soldering by pressing the positioning plate 11 and the pin holes 3. The corresponding positioning holes 12 and the pin holes 3 can reveal the soldering position of the soldering area of the circuit board, and accurately locate the soldering position on the circuit board.

[0040] See also Figure 5 and Figure 6 The pin holes 3 are evenly distributed in the receiving groove 2, and a first thermal expansion ring 20 is provided on the outside of each pin hole 3 and is nested and assembled at the bottom of the receiving groove 2. The first thermal expansion ring 20 is flush with the bottom of the receiving groove 2, and an overflow groove 21 connected to the pin hole 3 is opened at the bottom of the fixing seat 1 and the position corresponding to the pin hole 3, and a second thermal expansion ring 22 is provided on the outside of each overflow groove 21 and is nested and assembled at the bottom of the fixing seat 1.

[0041] When welding after the components are installed, the pins at the bottom of the fixing seat 1 are welded using wave soldering. At this time, the heat at the pins to be welded suddenly increases, which will cause the first thermal expansion ring 20 and the second thermal expansion ring 22 to expand due to the heat. The first thermal expansion ring 20 can increase the fit between the circuit board and the bottom of the storage groove 2 to prevent the soldering liquid from being contaminated on the bottom of the circuit board and forming a solder bridge. At the same time, the second thermal expansion ring 22 can isolate each pin in the welding state to prevent the soldering liquid from sticking to the pins and forming a solder bridge. At the same time, when the pins in the pin holes 3 are welded, the soldering liquid can be drained into the overflow groove 21 to prevent the pins with higher density from having a solder bridge during welding. It can achieve drainage of excess soldering liquid and isolate the pins to improve the independence of the pins during welding and improve anti-adhesion properties.

[0042] The bottom of each slide 14 is flush with the bottom of the fixed seat 1, and a support rod 16 is longitudinally slidably inserted in the middle of the bottom of the slide 14. The top of each support rod 16 extends out of the top of the slide 14 and is fixedly connected to a limit plate 17. An expansion air bag 18 is connected between the bottom outer edge of each limit plate 17 and the top of the slide 14. The expansion air bag 18 is connected to the pressure-bearing rubber air bag 10 on the second positioning component 5 through an air guide tube, and a solenoid valve is fixedly assembled on the air guide tube. A packaging plate 15 is connected between the bottom ends of the front and rear groups of support rods 16, and the top of the packaging plate 15 is evenly distributed with packaging bosses 19 corresponding to the pin holes 3.

[0043] The packaging boss 19 is a circular boss, and the outer diameter of the packaging boss 19 is the same as the inner diameter of the second thermal expansion ring 22. The packaging boss 19 is made of stainless steel or other materials with poor wettability with solder liquid, which can ensure that the packaging boss 19 is not contaminated with solder liquid after wave soldering. The packaging boss 19 is also easy to disassemble after welding is completed.

[0044] It is worth noting that when the width of the circuit board is not enough to interfere with the second positioning component 5, the gas after the pressure-bearing rubber air bag 10 of the first positioning component 4 is squeezed is introduced into the second positioning component 5, and the side wall of the circuit board is first clamped. Then, after the components on the circuit board are welded, the solenoid valve is controlled to open. At this time, the excess gas generated by the squeezing of the pressure-bearing rubber air bag 10 of the first positioning component 4 will be introduced into the expansion air bag 18 through the second positioning component 5 and the air guide tube, causing the expansion air bag 18 to expand, and then the packaging board 15 is driven to move upward through the support rod 16. The packaging boss 19 corresponds to the pin hole 3, so the upward movement of the packaging board 15 can be used to make the packaging boss 19 impact and flatten the soldering liquid at the overflow groove 21, so that the pins are laid flatly on the bottom of the circuit board, ensuring the welding consistency of the circuit board and avoiding the situation where the pins are of different lengths.

[0045] Similarly, when the width of the circuit board is sufficient to interfere with the second positioning component 5, after the components on the circuit board are welded, the control solenoid valve is opened. At this time, the internal gas of the pressurized rubber air bag 10 in the first positioning component 4 and the second positioning component 5 will be introduced into the expansion air bag 18 through the air duct to achieve gas replenishment, causing the expansion air bag 18 to expand, and the packaging plate 15 is driven upward by the support rod 16 to squeeze the bottom of the fixing seat 1 and flatten the welded pins, greatly enhancing the flatness of the pin welding operation. During this process, the positioning plate 11 does not move and is always in a downward limit state for the components on the circuit board, preventing the packaging boss 19 from flattening the pins and causing the pins to detach from the circuit board, thereby greatly improving the safety and welding quality of the component welding.

[0046] It is worth noting that after completing the welding operation of a group of components, manually press the limit plate 17 downward to cause the gas in the expansion air bag 18 to flow back to the second positioning component 5 and the first positioning component 4 through the air duct. At this time, the packaging plate 15 will move downward with the compression of the expansion air bag 18, and then the solenoid valve is closed, and the positioning, welding and flattening operations are repeated. This cycle is repeated until the welding of a single circuit board is completed, and then the positioning plate 11 is reset following the slide 14, and the circuit board can be removed from the first positioning component 4 and the second positioning component 5, and a new circuit board is replaced, and the pin welding operation of the components is performed again.

[0047] Example 2:

[0048] This embodiment discloses a positioning method for a welding auxiliary positioner, and the specific steps are as follows:

[0049] S1: Press the circuit board into the storage slot 2. The circuit board and the two sets of first positioning components 4 first come into contact. The squeezing force of the circuit board on the guide plate 8 overcomes the rebound force of the support spring 9, causing the two sets of first positioning components 4 to move away from each other, facilitating the insertion of the circuit board into the storage slot 2. The rebound of the support spring 9 exerts a positioning and clamping force on the circuit board on the clamping plate 7, ensuring that the circuit board is in the middle of the storage slot 2.

[0050] S2: When the width of the circuit board is not enough to interfere with the second positioning component 5, the gas inside the pressure-bearing rubber air bag 10 of the first positioning component 4 in the positioning and compression state will be introduced into the pressure-bearing rubber air bag 10 of the second positioning component 5 through the air pipe, so as to realize gas replenishment, prompting the pressure-bearing rubber air bag 10 of the second positioning component 5 to expand and increase the distance of the second positioning component 5, prompting the second positioning component 5 to squeeze and position the side wall of the circuit board, thereby improving the positioning accuracy of the circuit board and preventing uneven distribution on the left and right sides. At the same time, the four sides of the circuit board are synchronously limited to improve the clamping stability of the circuit board;

[0051] S3: When the width of the circuit board is large enough to interfere with the second positioning component 5, the first positioning component 4 and the second positioning component 5 will be synchronously in a compressed positioning clamping state. At this time, the internal gas of the pressurized rubber air bag 10 in the first positioning component 4 and the second positioning component 5 will be introduced into the expansion air bag 18 through the air duct to achieve gas replenishment, causing the expansion air bag 18 to expand, and the packaging board 15 to move upward through the support rod 16, squeezing the bottom of the fixing seat 1, flattening the welded pins, and greatly enhancing the flatness during the pin welding operation.

[0052] Example 3:

[0053] This embodiment discloses an application of a welding auxiliary positioner in PCB circuit board welding. The welding auxiliary positioner described in Example 1 can be used to perform corresponding positioning and installation according to PCB boards of different sizes, while ensuring the stability of the installation. It can achieve a one-to-one correspondence between pins and welding holes, divide the functional areas on the circuit board, and use the partition positioning function of the positioning plate 11 during welding to make the positioning of the area to be welded more accurate, making it more convenient to insert the pins of the components, and avoiding the circuit board from being skewed or moved. The correspondence between the positioning hole 12 and the pin hole 3 can reveal the welding position of the area to be welded on the circuit board, so that the welding position on the circuit board can be accurately positioned.

[0054] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A welding auxiliary positioner, comprising a fixing seat, characterized in that: A storage slot is provided on the top of the fixing seat, and pin holes are distributed on the bottom of the storage slot, and first positioning components are installed on the front and rear side walls of the storage slot, and second positioning components are installed on the left and right side walls of the storage slot. The first positioning assembly and the second positioning assembly have the same structural composition. The first positioning assembly and the second positioning assembly include a guide rod slidably plugged and assembled on the fixed seat, a clamping plate is fixed to the outer end of the guide rod, and a guide plate is integrally formed on the top of the clamping plate. A support spring sleeved on the outer wall of the guide rod is fixedly connected between the clamping plate and the inner side wall of the storage groove, and a pressure-bearing rubber air bag is sleeved on the outer side of the support spring and fixedly connected between the clamping plate and the inner side wall of the storage groove; The pressure-bearing rubber air bags in the single group of first positioning components and the single group of second positioning components are connected through an air pipe; The outer edge of the top of the fixed seat is provided with a slideway running through from top to bottom, and a slide seat is slidably assembled in the slideway. A positioning plate arranged just above the storage slot is connected between the front and rear slide seats, and the positioning plate is evenly distributed with positioning holes corresponding to the pin holes; The outer side of each pin hole is provided with a first thermal expansion ring which is nested and assembled in the bottom of the receiving groove. The bottom of the fixing base and the position corresponding to the pin hole are provided with an overflow groove which is connected to the pin hole. The outer side of each overflow groove is provided with a second thermal expansion ring which is nested and assembled in the bottom of the fixing base. A support rod is inserted in the middle of the bottom of the slide for longitudinal sliding. The top of each support rod extends out of the top of the slide and is fixedly connected to a limit plate. An expansion air bag is connected between the bottom outer edge of each limit plate and the top of the slide. The expansion air bag is connected to the pressure-bearing rubber air bag on the second positioning component through an air guide tube, and a solenoid valve is fixedly assembled on the air guide tube.

2. The welding auxiliary positioner according to claim 1, characterized in that: The two groups of first positioning components are in direct correspondence with each other, the two groups of second positioning components are in direct correspondence with each other, the slide is opened along the length direction of the fixed seat, and the length of the slide is / of the length of the fixed seat, there are two groups of positioning plates and they are symmetrically installed on the left and right sides of the top of the fixed seat, and the positioning plates span the storage slots.

3. The welding auxiliary positioner according to claim 2, characterized in that: The pin holes are evenly distributed in the receiving groove, and the first thermal expansion ring is flush with the bottom of the receiving groove.

4. The welding auxiliary positioner according to claim 1, characterized in that: The first positioning assembly and the second positioning assembly are arranged on the same horizontal plane. The clamping plate is a longitudinally arranged clamping plate. The outer surface of the guide plate is arc-shaped, and the connection between the clamping plate and the guide plate is an arc-shaped transition.

5. The welding auxiliary positioner according to claim 3, characterized in that: The bottom of each slide seat is flush with the bottom of the fixed seat. A packaging plate is connected between the bottom ends of the front and rear support rods. The top of the packaging plate is evenly distributed with packaging bosses corresponding to the pin holes.

6. The welding auxiliary positioner according to claim 5, characterized in that: The packaging boss is a circular boss, and the outer diameter of the packaging boss is the same as the inner diameter of the second thermal expansion ring; the length of the receiving groove is twice the width.

7. A positioning method for a welding auxiliary positioner according to any one of claims 1 to 6, characterized in that: The specific steps include: S1: Press the circuit board into the storage slot. The circuit board and the two sets of first positioning components first come into contact. The squeezing force of the circuit board on the guide plate overcomes the rebound force of the support spring, causing the two sets of first positioning components to move away from each other, facilitating the insertion of the circuit board into the storage slot. The rebound of the support spring applies a positioning and clamping force to the clamping plate on the circuit board, ensuring that the circuit board is in the middle of the storage slot. S2: When the width of the circuit board is not enough to interfere with the second positioning assembly, the gas inside the pressure-bearing rubber air bag of the first positioning assembly in the positioning and compression state is introduced into the pressure-bearing rubber air bag of the second positioning assembly through the air supply pipe to achieve gas replenishment, causing the pressure-bearing rubber air bag of the second positioning assembly to expand, thereby increasing the distance of the second positioning assembly and causing the second positioning assembly to squeeze and position the side wall of the circuit board; S3: When the width of the circuit board is sufficient to interfere with the second positioning assembly, the first positioning assembly and the second positioning assembly are simultaneously in a compressed positioning clamping state; S4: Plug and assemble the components according to the corresponding functional areas, so that the pins of the components pass through the soldering holes on the circuit board and then pass out of the pin holes. When soldering, manually slide the slide according to the length of the circuit board, and move the positioning plate to the soldering position of the components on the circuit board. Press the components at the soldering position through the positioning plate to achieve limited fixation, which facilitates the soldering of the pins of the components.

8. Use of the welding auxiliary positioner according to any one of claims 1 to 6 in PCB welding.

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