A flexible fixed LED street lamp circuit board welding device and method

Abstract

The present invention relates to the technical field of circuit board welding, and more specifically, to a flexible fixed LED street lamp circuit board welding device and method. It is inflated after the circuit board is in place, and the following process is formed: a circuit board with a larger area is squeezed, causing the distance of the blocking piece to change. At this time, after inflation, the change in the distance of the blocking piece causes a change in the inflation time, that is, the larger the area of ​​the circuit board, the longer its inflation time. At this time, the length of time for squeezing the squeezing block will not cause a change in the inflation time, thereby solving the problem that it is difficult for staff to grasp the force of pressing down the circuit board due to the influence of this variable, so that the expansion size of the airbag is only positively correlated with the size of the circuit board area. In the present invention, the gas source starts to supply gas to the gas pipeline after the blocking piece is opened to the maximum extent.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit board welding, and in particular to a flexible fixed LED street lamp circuit board welding device and method. Background Art

[0002] LED street light circuit boards usually use aluminum substrates or other materials with good thermal conductivity to better dissipate heat. However, aluminum substrates are more likely to warp during welding, which is mainly due to the physical properties of aluminum materials, such as thermal expansion coefficient and mechanical strength.

[0003] To this end, Patent Publication No.: CN114793396A proposes a working method of fixing the circuit board after the air bag is deformed to address the problem of warping during welding. Specifically, the circuit board squeezes the extrusion block. Since the extrusion block is provided with an inclined surface, the circuit board with a larger area squeezes the extrusion block to a greater extent. The extruded extrusion block drives the push rod to squeeze the rubber plug, and the rubber plug originally blocked inside the annular limit plate is pushed open. At this time, the gas stored inside the air bag enters the exhaust pipe through the air inlet, and is discharged into the inflatable bag from the inflation pipe. After the inflatable bag is inflated, it expands and deforms and is squeezed out from the clamping port to fill the gap between the placement slot and the circuit board. After the circuit board is placed, the position of the magnifying glass and the welding gun is adjusted, and the circuit board is welded with the welding gun. This can fix the circuit board, prevent the circuit board from warping during welding, and reduce the range of movement of the circuit board in the placement slot.

[0004] But the problem is that once the rubber plug moves, the gas inside the storage airbag will be discharged into the inflatable bag. This will cause the size of the expansion of the airbag to be related to the time of squeezing the extrusion block. Therefore, the time when the extrusion block is squeezed is not uniform, and the correlation accuracy between the size of the expansion of the airbag and the area of ​​the circuit board will be reduced. However, the time when the extrusion block is squeezed is difficult to make uniform, which will lead to the problem of excessive squeezing of the circuit board. Summary of the invention

[0005] The purpose of the invention is to provide a flexible fixed LED street lamp circuit board welding device and method to solve the problem of how to make the time for the gas source to supply gas into the airbag only positively correlated with the area of ​​the circuit board.

[0006] To achieve the above-mentioned purpose, one of the purposes of the present invention is to provide a flexible fixed street lamp circuit board welding device, which is inflated after the circuit board is in place, and forms the following process: a circuit board with a larger area is squeezed, causing the distance of the blocking piece to change. At this time, after inflation, the change in the distance of the blocking piece causes a change in the inflation time, that is, the larger the area of ​​the circuit board, the longer its inflation time. At this time, the length of time of squeezing the extrusion block will not cause a change in the inflation time, thereby solving the problem that the staff is difficult to grasp the force of pressing down the circuit board due to the influence of this variable, and making the expansion size of the airbag positively correlated only with the area of ​​the circuit board.

[0007] Specifically, it comprises a workbench with a circuit board placement cavity on the top, and a flexible fixing system, which uses gas to flexibly fix the circuit board in the circuit board placement cavity, the workbench comprises an inner frame, which is used to enclose the circuit board placement cavity, and a plurality of slide grooves are opened on the side wall of the inner frame corresponding to the flexible fixing system; and an outer frame, which is arranged outside the inner frame and carries the flexible fixing system together with the inner frame;

[0008] The flexible fixing system comprises:

[0009] A contact head is slidably connected in the slide groove, an air bag is arranged inside the contact head, and a side of the contact head facing the circuit board placement cavity has an air bag groove for the air bag to pop out;

[0010] At least one gas pipeline, which is supported by the outer frame, has one end connected to the airbag in the contact head, and the other end connected to the gas source through an air pump, and the gas supplied by the gas source is filled into the airbag through the gas pipeline, so that the airbag is expanded and popped out of the airbag groove to fill the gap between the contact head and the circuit board;

[0011] And, a plugging piece arranged in the gas pipeline, which is squeezed open by the contact head and then slowly closed;

[0012] Among them, the gas source starts to supply gas into the gas pipeline after the sealing piece is opened to the maximum extent, and when a circuit board with a larger area squeezes the contact head, the maximum extent to which the sealing piece can be opened becomes larger, and the time taken for the sealing piece to close is prolonged, so that the time for the gas source to supply gas into the airbag is only positively correlated with the area of ​​the circuit board.

[0013] The second object of the present invention is to provide a welding method, which can use the above-mentioned welding equipment in conjunction with a welding gun to weld the circuit board of an LED street lamp.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] In the flexible fixed LED street lamp circuit board welding equipment and method, the gas source starts to supply gas to the gas pipeline after the sealing piece is opened to the maximum extent, and when a circuit board with a larger area squeezes the contact head, the maximum extent to which the sealing piece can be opened becomes larger, which results in a longer time for the sealing piece to be closed, so that the time for the gas source to supply gas to the airbag is only positively correlated with the area of ​​the circuit board, eliminating the influence of the squeezing time of the squeezing block on the inflation time, and improving the correlation accuracy between the time of gas supply in the airbag and the area of ​​the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the structure of the workbench of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of the flexible fixing system of the present invention;

[0019] Figure 4 It is a schematic diagram of the connection relationship between the flexible fixing system and the workbench structure of the present invention;

[0020] Figure 5 It is a schematic diagram of the circuit board pressing process of the present invention;

[0021] Figure 6 A top view of the airbag of the present invention after expansion;

[0022] Figure 7 It is a schematic diagram of the bottom structure of the bottom plate of the present invention;

[0023] Figure 8 is a schematic diagram of the third airbag structure of the present invention;

[0024] Fig. 9 This is a schematic diagram of the working principle structure of the flexible fixing system of the present invention;

[0025] Fig.10 This is the second schematic diagram of the working principle structure of the flexible fixing system of the present invention.

[0026] The meaning of each number in the figure is:

[0027] 100, workbench; 100A, circuit board placement cavity; 100B, interlayer; 100C, corner space; 110, inner frame; 110A, slide groove; 111, extension plate; 120, outer frame; 120A, connection hole; 130, cover plate; 140, bottom plate; 141, bottom plate groove; 1411, through groove; 142, side groove; 1421, fine hair;

[0028] 200, flexible fixing system; 210, contact head; 210A, air hole; 210B, first airbag groove; 210C, second airbag groove; 210a, first expansion airbag; 210b, second expansion airbag; 211, outer tube; 212, pressure rod; 213, snowflake plate; 220, inner tube; 220A, expansion cavity; 221, movable block; 222, magnetic ring; 230, air pipe; 231, airbag tube; 2311, third airbag; 240, spring; 241, outer shell;

[0029] 300. Air pump; 400. Circuit board. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the prior art, the circuit board squeezes the extrusion block, and the circuit board with a larger area squeezes the extrusion block to a greater extent. The squeezed extrusion block drives the push rod to squeeze the rubber plug. At this time, the gas inside the storage airbag is discharged into the inflatable bag, and the expansion of the inflatable bag fills the gap between the placement groove and the circuit board. Then the circuit board can be welded with a welding gun. However, once the rubber plug moves, the gas inside the storage airbag will be discharged into the inflatable bag. In this way, the size of the expansion of the inflatable bag is also related to the time of squeezing the extrusion block, and under the action of the stretched spring, it will keep synchronous movement with the extrusion block. Once the circuit board is completely placed, the rubber plug will quickly reset.

[0034] To this end, the present invention provides a flexible fixed LED street lamp circuit board welding device, which is inflated after the circuit board is in place, and forms the following process: a circuit board with a larger area is squeezed, causing the distance of the blocking piece to change. At this time, after inflation, the change in the distance of the blocking piece causes a change in the inflation time, that is, the larger the area of ​​the circuit board, the longer its inflation time. At this time, the length of time for squeezing the squeezing block will not cause a change in the inflation time, thereby solving the problem that the staff is difficult to control the force of pressing down the circuit board due to the influence of this variable, and the expansion size of the airbag is only positively correlated with the area of ​​the circuit board.

[0035] In the first embodiment, see Figure 1 As shown, the welding equipment includes a workbench 100, the workbench 100 has a circuit board placement cavity 100A with an open top, a welding gun (not shown in the figure) is arranged near the workbench 100, or an external welding gun is used in conjunction with the workbench 100; Figure 2 As shown, the workbench 100 includes an inner frame 110, and a circuit board placement cavity 100A is formed by the inner frame 110. When welding, the circuit board is placed in the circuit board placement cavity 100A. Figure 4 As shown, a plurality of slide grooves 110A are provided on the side wall of the inner frame 110; the welding device also includes a flexible fixing system 200, see Figure 3 As shown, the flexible fixing system 200 includes a gas pipeline, a contact head 210 and a blocking member. The contact head 210 is slidably connected in the slide groove 110A, and one end of the contact head 210 is exposed in the circuit board placement cavity 100A. The top of the end has a downwardly inclined slope. When in use, the circuit board 400 is placed in the circuit board placement cavity 100A as in the prior art. During this process, the circuit board 400 presses the contact head 210, and when the circuit board 400 with a larger area presses the contact head 210, the sliding amplitude of the contact head 210 will also become larger, as shown in FIG. Figure 5 As shown, the circuit board 400 moves downward. Under the guidance of the top inclined surface of the contact head 210, the downward force of the circuit board 400 on the top inclined surface of the contact head 210 is converted into a thrust to push the contact head 210 to move outward along the slide groove 110A. It should be emphasized that:

[0036] The side of the contact head 210 opposite to the inclined surface is the tail, and the gas pipeline is connected to the tail of the contact head 210. For details, see Figure 3 As shown, the gas pipeline includes an outer tube 211, an inner tube 220 and an air pipe 230. In addition, the interior of the contact head 210 is hollow and accommodates an air bag. A plurality of air holes 210A are opened on the side wall of the rear end of the contact head 210. The air holes 210A are connected to the air bag through a connecting ring. The outer tube 211 is connected to the side wall of the rear end of the contact head 210 at a position coaxial with the air holes 210A. The inner tube 220 is slidably connected in the outer tube 211 (or slidably connected outside the outer tube 211). The air pipe 230 is connected to the rear end of the inner tube 220 (on the same side as the rear end of the contact head 210). The air pipe 230 connects the gas source to the inner tube 220. The gas source connected to the inner tube 220 flows through the outer tube 211 and is filled into the air bag through the air holes 210A. Therefore, the inner tube 220 and the outer tube 211 need to be closely fitted to reduce the amount of gas leakage. In order to fix the inner tube 220, see Figure 2 and Figure 4 As shown, the workbench 100 also includes an outer frame 120, and a connecting hole 120A is opened on the outer frame 120 in the axial direction corresponding to the inner tube 220. The tail end of the inner tube 220 passes through the connecting hole 120A and is connected to the air pipe 230. That is to say, the contour of the connecting hole 120A is adapted to the outer contour of the inner tube 220 to stably fix it on the outer frame 120.

[0037] like Figure 3 As shown, a movable block 221 is arranged in the gas pipeline, or in other words, in the inner tube 220. The outer diameter of the movable block 221 is smaller than the inner diameter of the inner tube 220, and the movable block 221 is suspended in the inner tube 220, so that the movable block 221 and the inner tube 220 are coaxial. In this way, when inflating / exhausting, the gas flows through the inner tube 220 through the gap between the movable block 221 and the inner tube 220. If the inner tube 220 is to be blocked, a magnetic ring 222 needs to be arranged. The magnetic ring 222 is arranged in the inner tube 220 at a position adjacent to the outer tube 211. The magnetic ring 222 is used to provide a suction effect to the movable block 221 at the far end, so that the movable block 221 can be in contact with it. Suction, and the outer diameter of the movable block 221 is larger than the inner ring diameter of the magnetic ring 222, the outer edge of the magnetic ring 222 is tightly fitted with the inner wall of the inner tube 220, and after the movable block 221 and the magnetic ring 222 are attracted to each other, the inner tube 220 can be blocked, and in coordination with it: a snowflake plate 213 is arranged in the air hole 210A, and a pressure rod 212 located in the outer tube 211 is arranged at the center of the snowflake plate 213. The snowflake plate 213 is arranged to avoid blocking the air hole 210A, and is used to connect the pressure rod 212. When the contact head 210 is squeezed by the circuit board 400 and moves outward, the pressure rod 212 will be used to squeeze the movable block 221. In addition, if Figure 3 and Figure 4As shown, a spring 240 is provided between the rear side wall of the contact head 210 and the outer frame 120, and outside the outer tube 211 and the inner tube 220. In this way, after the circuit board 400 is completely placed, the contact head 210 is quickly reset under the action of the compressed spring 240, and at this time, the movable block 221 slowly moves toward the magnetic ring 222 under the force of opposite attraction generated by the magnetic ring 222 until it is attracted thereto. That is to say, when a larger area of ​​the circuit board 400 squeezes the contact head 210, the sliding amplitude of the contact head 210 will also become larger, and the pressure rod 21 The sliding amplitude of the movable block 221 will also increase when it is squeezed. After the contact head 210 is reset, the time taken for the movable block 221 and the magnetic ring 222 to attract each other will also increase. Therefore, if air is inflated into the air pipe 230 after the contact head 210 is reset, the inflation time will match the time taken for the movable block 221 and the magnetic ring 222 to attract each other. Finally, the inflation time is only related to the moving distance of the movable block 221 when it is squeezed by the pressure rod 212 (that is, the distance that the contact head 210 moves outward under the squeezing) (that is, the inflation time is only related to the area size of the circuit board 400).

[0038] It can be seen that the blocking member includes a movable block 221 sliding along the inner tube 220, and a magnetic ring 222 is provided in the inner tube 220 at a position adjacent to the outer tube 211, and the magnetic ring 222 is used to provide a suction effect to the movable block 221 at the far end, so that the movable block 221 can be attracted thereto;

[0039] There is a gap between the movable block 221 and the inner tube 220 for gas circulation;

[0040] The movable block 221 and the magnetic ring 222 are attracted to each other and seal the inner tube 220 .

[0041] For specific implementation, see Figure 2 As shown, a square inner frame 110 and a square outer frame 120 are used as an example. In order to connect the inner frame 110 and the outer frame 120 together, a square support plate is provided at the bottom of the two. The outline of the outer frame 120 is adapted to the outline of the support plate, and the outer frame 120 is fixedly connected to the support plate. The inner frame 110, which is smaller than the outline of the outer frame 120, is fixedly connected to the support plate in the outer frame 120. The circuit board placement cavity 100A is enclosed by the inner frame 110, and a sandwich 100B is formed between the inner frame 110 and the outer frame 120. Slide grooves 110A are provided in four directions of the inner frame 110; most of the structure of the flexible fixing system 200 is accommodated in the sandwich 100B, as shown in FIG. Figure 3As shown, the flexible fixing system 200 includes four contact heads 210, and the four contact heads 210 are slidably connected in four square slide grooves 110A respectively. Since the above scheme has described the specific structure of the contact head 210, it will not be repeated here. However, it should be emphasized that a small part of the inclined surface on the top of the contact head 210 is hidden in the slide groove 110A, so as to ensure that there is no horizontal surface on the top inclined surface of the contact head 210 exposed in the circuit board placement cavity 100A to block the downward pressed circuit board 400; the flexible fixing system 200 also includes four groups of inner tubes 220, which are respectively arranged corresponding to the contact heads 210, and each group is provided with a plurality of inner tubes 220 according to the length of the corresponding contact head 210, such as Figure 4 As shown, the inner tube 220 is fixed in the connection hole 120A opened on the outer frame 120, and returns to Figure 3 From the above scheme, it can be seen that an air hole 210A aligned with the axial direction of the inner tube 220 is opened on the side wall of the rear part of the contact head 210, and the air hole 210A is connected to the pressure rod 212 extending toward the inner tube 220 through the snowflake plate 213. In addition, before the contact head 210 is squeezed, the pressure rod 212 passes through the magnetic ring 222 and fits with the movable block 221 (the magnetic ring 222 and the movable block 221 are both arranged in the inner tube 220), and does not affect the attraction between the movable block 221 and the magnetic ring 222. In this way, when the circuit board 400 with a larger area squeezes the contact head 210, the sliding amplitude of the contact head 210 will also become larger. Fig. 9 As shown, the circuit board 400 moves downward, and under the guidance of the top inclined surface of the contact head 210, the downward pressure of the circuit board 400 on the top inclined surface of the contact head 210 is converted into a thrust for pushing the contact head 210 to move outward along the slide groove 110A, and the movable block 221 and the pressure rod 212 keep moving synchronously. That is to say, when the circuit board 400 with a larger area presses the contact head 210, the sliding amplitude of the movable block 221 will also become larger, such as Figure 5 As shown, after the circuit board 400 is completely positioned, the contact head 210 is quickly reset under the action of the compressed spring 240, and a plurality of hard brushes are irregularly arranged on the periphery of the movable block 221. Under the support of the hard brushes, the movable block 221 can be suspended in the inner tube 220 and be coaxial with the inner tube 220; specifically, after the contact head 210 is quickly reset, under the combined action of the friction force between the hard brush and the inner wall of the inner tube 220 and the magnetic attraction force, the movable block 221 slowly approaches the magnetic ring 222, that is, the time taken for the movable block 221 and the magnetic ring 222 to attract each other and block the inner tube 220 (that is, the inflation time) is proportional to the sliding amplitude of the movable block 221; as shown in FIG. Figure 2 and Figure 4As shown, an air pump 300 is provided in the interlayer 100B, which forms an air source connected to the air pipe 230, and a sensor is provided near the contact head 210, which is used to monitor the movement state of the contact head 210. When the first stage of the reciprocating movement is completed, the air pump 300 inflates the air pipe 230 (thereby making full use of the inflation time), see Fig. 9 As shown, the gas enters the inner tube 220 along the dotted line direction, and then flows through the gap between the movable block 221 and the inner tube 220. Under the filtration of the hard brush, larger particles are blocked on the side of the movable block 221 away from the contact head 210 to prevent the larger particles from scratching the airbag. Then, the filtered gas flows into the outer tube 211 through the magnetic ring 222 and the subsequent inner tube 220, and then enters the airbag through the air hole 210A, so that the airbag in the contact head 210 expands. Figure 5 In the embodiment, the contact head 210 has a first airbag groove 210B at the bottom and second airbag grooves 210C at both sides. Figure 6 As shown, the ends of adjacent contact heads 210 are arranged adjacent to each other, so that corner spaces 100C are formed at the four corners of the circuit board placement cavity 100A. When the airbag in the contact head 210 is expanded, the first expansion airbag 210a ejected from the first airbag groove 210B cooperates with the contact head 210 to limit the four sides of the circuit board 400. Because the first expansion airbag 210a is flexibly connected, the circuit board 400 is slightly deformed during the welding process. The first expansion airbag 210a can also be adaptively adjusted to protect the circuit board 400 while fitting and wrapping the four sides of the circuit board 400 to prevent warping during welding. In addition, the second expansion airbag 210b ejected from the second airbag groove 210C and the adjacent second expansion airbag 210b are connected to the second expansion airbag 210c. The second expansion airbag 210b fills the corner space 100C, thereby wrapping the corner of the circuit board 400 to compensate for the two ends of the first expansion airbag 210a with weak limiting ability; after welding is completed, the circuit board 400 is taken out from the circuit board placement cavity 100A, which will also squeeze the contact head 210. At this time, the gas pipeline cooperates with the air pump 300 to quickly extract the gas in the airbag. In this process, the blocked particles also flow out of the gas pipeline. At the same time, the movable block 221 is gradually sucked to the magnetic ring 222 and fits with it; and with the inside of the contact head 210 as the proximal end, an elastic rope (not shown in the figure) is connected between the proximal end and the distal end in the airbag, and its function is to enable the deflated airbag to be recovered into the contact head 210.

[0042] Preferably, the air pipe 230 is a flexible structure.

[0043] Preferably, Figure 4 As shown, the spring 240 is provided with a shell 241 outside, and the shell 241 can wrap most of the spring 240 to protect it.

[0044] Preferably, continue to see Figure 4 As shown, an extension plate 111 is provided on the outer wall of the inner frame 110 around the slide slot 110A to extend the slide slot 110A, thereby reducing the thickness of the inner frame 110 while ensuring the movable distance of the contact head 210 .

[0045] Preferably, Figure 2 As shown, a cover plate 130 is disposed on the top of the interlayer 100B to seal it.

[0046] In actual use, combined with Fig. 9 As shown, there is an opposite force of attraction between the movable block 221 and the magnetic ring 222. When the two are attracted, because the pressure rod 212 is in contact with the movable block 221, when the circuit board 400 is placed on the contact head 210, the contact head 210 can not only be subjected to the reaction force of the spring 240, but also be subjected to the reaction force of the movable block 221. In this way, the contact head 210 can effectively support the circuit board 400. After the circuit board 400 is adjusted to a horizontal level, a downward pressure is applied to the circuit board 400, usually by pressing with hands. Similarly, after the circuit board 400 is in place, the contact head 210 can also effectively cooperate with the first expansion airbag 210a to wrap the circuit board 400. In addition, a spring 240 with lower strength can be used. Once the movable block 221 is separated from the magnetic ring 222, the contact head 210 only needs to be subjected to a smaller extrusion force to move outward, that is, after overcoming the suction between the movable block 221 and the magnetic ring 222, the contact head 210 can be easily pressed.

[0047] Second embodiment, see Figure 7 As shown, the present embodiment provides a bottom plate 140, which is used to replace the support plate in the above-mentioned embodiment. In the present embodiment, the air pump 300 takes in air or exhausts air from the bottom, and a bottom plate groove 141 is provided at the bottom of the bottom plate 140 corresponding to the air intake or exhaust position of the air pump 300. A through groove 1411 is provided through the bottom plate groove 141 for air intake or exhaust of the air pump 300, and a side groove 142 is provided on one side of the bottom plate groove 141, and the side groove 142 is covered with fine hair 1421, so as to filter the incoming air.

[0048] The third embodiment is improved on the basis of the first embodiment. Figure 8 and Fig.10As shown, a cavity is provided in the support plate, a third airbag 2311 is provided in the cavity, a notch is provided at the top of the cavity (i.e., the third airbag 2311 is provided at the bottom of the circuit board placement cavity 100A), and an airbag tube 231 is provided at the air inlet or exhaust end of the air pump 300, the airbag tube 231 passes through the support plate and is connected to the third airbag 2311, in addition, the bottom of the contact head 210 is also provided with an inclined surface, and the top and bottom inclined surfaces form a "V" shape with the opening facing outwards. When in use, the circuit board 400 squeezes the contact head 210 to trigger the inflation process, and the air is The pump 300 draws the gas in the third airbag 2311 into the airbag of the contact head 210. Based on the first reciprocating motion, when the sensor detects that the contact head 210 in the second stage moves outward, the air pump 300 draws the gas in the airbag of the contact head 210 into the third airbag 2311, causing it to expand upward through the slot to push out the circuit board 400. After the circuit board 400 passes over the contact head 210, the sensor will detect that the contact head 210 in the third stage has completed resetting. At this time, the air pump 300 stops working and waits for the next start.

[0049] Preferably, the first airbag groove 210B is disposed at a lower side position of the bottom slope of the contact head 210 .

[0050] More preferably, Fig.10 As shown, the top of the inner tube 220 protrudes upward near the tail to form an expansion chamber 220A. When the movable block 221 slides to the bottom of the expansion chamber 220A, the gap increases, thereby improving the exhaust or intake efficiency.

[0051] The second purpose of this embodiment is to provide a welding method, which can use the welding equipment of any of the above embodiments in conjunction with a welding gun to weld the circuit board of the LED street lamp.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A flexible fixed LED street lamp circuit board welding device, comprising a workbench (100) with a circuit board placement cavity (100A) arranged on the top, and a flexible fixing system (200), which uses gas to flexibly fix the circuit board in the circuit board placement cavity (100A), characterized in that: The workbench (100) comprises an inner frame (110) for enclosing a circuit board placement cavity (100A), a plurality of slide grooves (110A) being provided on the side wall of the inner frame (110) corresponding to the flexible fixing system (200); and an outer frame (120) which is arranged outside the inner frame (110) and carries the flexible fixing system (200) together with the inner frame (110); The flexible fixing system (200) comprises: A contact head (210) is slidably connected in the slide groove (110A), an air bag is arranged inside the contact head (210), and a side of the contact head (210) facing the circuit board placement cavity (100A) has an air bag groove for the air bag to pop out; at least one gas pipeline, supported by the outer frame (120), one end of which is connected to the airbag in the contact head (210), and the other end of which is connected to the gas source via a provided air pump (300), the gas supplied by the gas source being filled into the airbag via the gas pipeline, so that the airbag is expanded and then popped out of the airbag groove to fill the gap between the contact head (210) and the circuit board; and a blocking piece arranged in the gas pipeline, which is pressed open by the contact head (210) and then slowly closed; The gas source starts to supply gas into the gas pipeline after the blocking piece is opened to the maximum extent, and when the area of ​​the circuit board that squeezes the contact head (210) increases, the maximum extent to which the blocking piece can be opened increases accordingly, and the time taken for the blocking piece to close is prolonged, so that the time for the gas source to supply gas into the airbag is only positively correlated with the area of ​​the circuit board; The contact head (210) has a first airbag groove (210B) at the bottom, second airbag grooves (210C) at both sides, and ends of adjacent contact heads (210) are arranged adjacent to each other to form a corner space (100C), wherein: The first expansion airbag (210a) ejected from the first airbag groove (210B) cooperates with the contact head (210) to restrict the periphery of the circuit board (400); The second inflatable airbag (210b) ejected from the second airbag groove (210C) and its adjacent second inflatable airbag (210b) fill the corner space (100C) to compensate for the two ends of the first inflatable airbag (210a) with weak limiting capabilities.

2. The flexible fixed LED street light circuit board welding equipment according to claim 1 is characterized in that: A plurality of air holes (210A) are provided on the side wall of the rear portion of the contact head (210), and the air holes (210A) are connected to the air bag.

3. The flexible fixed LED street light circuit board welding equipment according to claim 2 is characterized in that: The gas pipeline comprises an outer tube (211), an inner tube (220) and an air pipe (230); the outer tube (211) is connected to the side wall of the rear end of the contact head (210) at a position coaxial with the air hole (210A); the inner tube (220) is slidably connected inside the outer tube (211); one end of the air pipe (230) is connected to the rear end of the inner tube (220), and the other end is connected to a gas source; The inner tube (220) and the outer tube (211) are tightly fitted.

4. The flexible fixed LED street light circuit board welding equipment according to claim 3 is characterized in that: The blocking member comprises a movable block (221) sliding along the inner tube (220); a magnetic ring (222) is provided in the inner tube (220) at a position adjacent to the outer tube (211); the magnetic ring (222) is used to provide a suction force to the movable block (221) at the far end, so that the movable block (221) can be attracted to the inner tube (220); There is a gap between the movable block (221) and the inner tube (220) for gas circulation; The movable block (221) and the magnetic ring (222) are attracted to each other and then seal the inner tube (220).

5. The flexible fixed LED street light circuit board welding equipment according to claim 4 is characterized in that: A snowflake plate (213) is arranged in the air hole (210A), and a pressure rod (212) located in the outer tube (211) is arranged at the center of the snowflake plate (213); Before the contact head (210) is squeezed, the pressure rod (212) passes through the magnetic ring (222) and fits the movable block (221) without affecting the attraction between the movable block (221) and the magnetic ring (222).

6. The flexible fixed LED street light circuit board welding equipment according to any one of claims 3 to 5, characterized in that: A spring (240) is provided between the rear side wall of the contact head (210) and the outer frame (120) and outside the outer tube (211) and the inner tube (220).

7. The flexible fixed LED street light circuit board welding equipment according to claim 4 is characterized in that: A plurality of hard brushes are irregularly arranged on the periphery of the movable block (221); supported by the hard brushes, the movable block (221) is suspended in the inner tube (220) and is coaxial with the inner tube (220).

8. The flexible fixed LED street light circuit board welding equipment according to claim 1 is characterized in that: A third air bag (2311) is arranged at the bottom of the circuit board placement cavity (100A), and the gas stored in the third air bag (2311) forms a gas source for gas supply and recovers the gas at the same time; When the gas is recovered, the third air bag (2311) expands upward to push the circuit board out of the contact head (210).

9. A welding method, characterized in that: The welding device described in any one of claims 1 to 8 can be used in conjunction with a welding gun to weld the circuit board of an LED street lamp.

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