Welding fixing device, automatic welding equipment and welding method

Abstract

The invention provides a welding fixing device, automatic welding equipment and a welding method, relates to the technical field of circuit board welding, and aims to solve the technical problem that a circuit board with a slender bonding pad cannot be attached to a welding strip in the welding process. The fixing device comprises two clamping plates for clamping the circuit board. Each clamping plate is provided with a first end face used for clamping a circuit board and a second end face opposite to the first end face. Each clamping plate is provided with at least one first groove formed in the first end face, and the first grooves are matched with the circuit board; each clamping plate is provided with at least one welding part formed on the second end face, the welding part comprises a through hole and a second groove connected with the through hole, the through hole corresponds to the first bonding pad, the groove bottom of the second groove is provided with a second plane, and the second plane is used for fixing a welding strip; the groove bottom of the first groove is provided with a first plane, the first plane and the second plane have a common plane, and the flatness of the common plane is smaller than 0.01. By means of the welding fixing device, the welding qualification rate can be guaranteed.

Description

Technical Field

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

[0002] As electronic devices gradually develop towards miniaturization and integration, the integration of various components is getting higher and higher, and the packaging density is getting higher and higher. Theoretical calculations show that the shape of the solder joints inside the circuit board is the most important factor affecting the distribution of electromagnetic fields and the propagation of electromagnetic waves. In the actual welding process, small differences in the length and size of the solder joints will cause changes in the performance of the circuit board.

[0003] The pads with slender solder joints in the circuit board need to be soldered with the solder tape close to the microstrip line, without warping or offset, and the amount of tin is evenly distributed. The positioning requirements are high, and the amount of tin creeping must be uniform and consistent within a certain distance. From the above, it can be seen that for circuit boards with slender solder joints, the bonding effect between the solder tape and the pad is not good during the welding process, especially during automatic welding. Summary of the invention

[0004] The purpose of the present invention is to provide a welding fixture, automatic welding equipment and welding method to solve the technical problem that a circuit board with a slender welding pad cannot be bonded with a welding strip during welding.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a welding fixing device for fixing a circuit board and a welding strip, wherein both sides of the circuit board have at least one first welding pad, and the first welding pad is an elongated welding pad; the fixing device comprises two clamping plates for clamping the circuit board;

[0007] Each of the clamping plates has a first end surface for clamping the circuit board and a second end surface opposite to the first end surface;

[0008] Each of the clamping plates has at least one first groove formed on the first end surface, and the first groove matches the circuit board;

[0009] Each of the clamping plates has at least one welding portion formed on the second end surface, the welding portion includes a through hole and a second groove connected to the through hole, the through hole corresponds to the first pad, the bottom of the second groove has a second plane, and the second plane is used to fix the welding strip;

[0010] The bottom of the first groove has a first plane, the first plane and the second plane have a common plane, and the flatness of the common plane is less than or equal to 0.01.

[0011] According to at least one embodiment of the present invention, the two clamping plates are connected by magnetic clearance fit; or,

[0012] The two clamping plates are connected by means of a stud clearance fit.

[0013] According to at least one embodiment of the present invention, the fixing device further comprises a frame for accommodating the two clamping plates, and one of the two clamping plates is fixedly connected to the frame.

[0014] According to at least one embodiment of the present invention, the fixing device further comprises at least one third groove formed on the inner wall of the frame, and the third groove is used to accommodate the electrical connector of the circuit board;

[0015] The third groove is matched with the corresponding electrical connector.

[0016] According to at least one embodiment of the present invention, the circuit board has a second soldering pad connected to the electrical connector, and each of the clamping plates has at least one notch corresponding to the second soldering pad.

[0017] According to at least one embodiment of the present invention, the frame is a frame formed by at least a plurality of connecting rods, and the connecting rods are fixedly connected; or,

[0018] The connecting rods are detachably connected.

[0019] According to at least one embodiment of the present invention, when the connecting rods are detachably connected, the connecting rods are connected by magnetic attraction; or,

[0020] The connecting rods are connected by bolts.

[0021] According to at least one embodiment of the present invention, the fixing device further comprises at least one connecting portion respectively formed on the outer walls opposite to the frame, and the connecting portion is used to be connected to the welding device.

[0022] According to at least one embodiment of the present invention, the through hole has a first transition inner wall, and along the direction from the second end face to the first end face, the cross-sectional area of ​​the through hole at the first transition inner wall portion decreases; and / or,

[0023] The second groove has a second transition inner wall, and along the direction from the second end surface to the first end surface, the cross-sectional area of ​​the second groove at the second transition inner wall portion decreases.

[0024] According to at least one embodiment of the present invention, at least one threaded hole is formed on the second end surface of at least one of the two clamping plates, and the threaded hole is used to connect the detachable handle.

[0025] Among the one or more technical solutions provided in the exemplary embodiments of the present invention, at least one of the following beneficial effects can be achieved.

[0026] (1) The welding and fixing device of the embodiment of the present invention clamps the circuit board between two clamping plates, and a corresponding first groove is formed on the first end faces of the two clamping plates. The shape and size of the first groove are the same as those of the circuit board, so that the circuit board can be positioned and the relative position relationship between the circuit board and the two clamping plates can be maintained. By setting a welding part at the position corresponding to the first pad on each clamping plate and the circuit board, the first pad on the front and back sides of the circuit board can be welded. Specifically, the welding part includes a through hole penetrating the clamping plate to expose the first pad to be welded on the circuit board, and the welding part also includes a second groove connected to the through hole. A second plane is formed at the bottom of the second groove. The second plane can be used to fix the welding strip to be welded. Since the first plane and the second plane at the bottom of the first groove have a common plane, wherein the flatness of the common plane is less than or equal to 0.01, the welding strip fixed on the second plane forms a tightly fitting configuration relationship with the slender pad on the circuit board attached to the first plane, so that the welding strip and the pad are flat and tightly attached without warping or hanging, thereby ensuring the welding qualification rate.

[0027] (2) The clamping plate of the exemplary embodiment of the present invention has a certain thickness. The first groove, the second groove and the through hole are formed on the clamping plate to form a second plane for fixing the solder strip, so that the flatness of the common plane of the first plane and the second plane is less than or equal to 0.01. On the one hand, the clamping plate with a certain thickness has a certain rigidity, which can form a tight fitting and fixing effect between the first groove and the circuit board; on the other hand, the common plane with a flatness less than or equal to 0.01 can be formed through existing processing technology to meet the requirement of tight fitting between the solder strip and the circuit board. If a thinner clamping plate is used to ensure the flatness of the common plane of the two planes, the clamping plate cannot have a large rigidity, and the fit between the circuit board cannot be guaranteed, and further, the tight fit between the pad and the solder strip cannot be guaranteed.

[0028] (3) Furthermore, a welding portion is provided on each clamping plate, so that the parts to be welded on the front and back sides of the circuit board can be welded by flipping, which is suitable for automatic welding and has a higher degree of automation.

[0029] In a second aspect, the present invention further provides an automatic welding device, comprising a welding device and the fixing device described in the first aspect, wherein the fixing device is rotatably connected to the welding device.

[0030] The advantages of the automatic welding equipment over the prior art are the same as the advantages of the welding fixture provided in the first aspect over the prior art, and will not be repeated here.

[0031] In a third aspect, the present invention further provides an automatic welding method, which is applied to the welding device described in the second aspect, and the method comprises:

[0032] One of the two clamping plates is fixed in the frame;

[0033] Fix the welding strip on the second plane of each clamping plate;

[0034] The circuit board to be welded is placed in the first groove of the clamping plate fixed to the frame;

[0035] After connecting the other clamping plate of the two clamping plates to the handle, the other clamping plate is placed on the circuit board, wherein the first groove of the other clamping plate is attached to the circuit board, and the two clamping plates are connected by magnetic attraction;

[0036] removing the handle on the other clamping plate;

[0037] The frame is rotatably connected to the welding device.

[0038] The advantages of the automatic welding method over the prior art are the same as the advantages of the welding fixture provided in the first aspect over the prior art, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings illustrate exemplary embodiments of the present invention and together with the description serve to explain the principles of the present invention, and these drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification;

[0040] Figure 1 is a schematic diagram of an exploded structure of a welding fixture according to an embodiment of the present invention;

[0041] Figure 2 is a schematic diagram of a top view of a welding fixture according to an embodiment of the present invention;

[0042] Figure 3 is a bottom view structural schematic diagram of a welding fixture according to an embodiment of the present invention;

[0043] Figure 4 is a schematic diagram of a three-dimensional structure of a clamping plate according to an embodiment of the present invention;

[0044] Figure 5 is a bottom view structural schematic diagram of a clamping plate according to an embodiment of the present invention;

[0045] Figure 6 is a schematic diagram of a three-dimensional structure of a clamping plate according to another embodiment of the present invention;

[0046] Figure 7 is a bottom view structural schematic diagram of a clamping plate according to another embodiment of the present invention;

[0047] Figure 8 2 is another exploded structural schematic diagram of a welding fixture according to an embodiment of the present invention.

[0048] Figure numerals: 10, clamping plate; 11, second end face; 111, second groove; 111a, second transition inner wall; 112, through hole; 112a, first transition inner wall; 12, first end face; 121, first groove; 13, positioning hole; 14, threaded hole; 15, magnet hole; 16, notch; 30, circuit board; 31, welding strip; 32, electrical connector; 40, frame; 41, connecting part; 42, first connecting rod; 421, rib plate; 43, second connecting rod; 431, third groove; 432, magnetic column; 50, magnet. DETAILED DESCRIPTION

[0049] The present invention will be further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0050] As electronic equipment such as radars gradually develop towards miniaturization and integration, the integration of various components is becoming higher and higher, and the packaging density is becoming higher and higher, which also puts very high requirements on the control of performance differences between individual radar antennas.

[0051] The shape of the solder joints inside the antenna layout is the most important factor affecting the electromagnetic field distribution and electromagnetic wave propagation. The simulation results of the antenna are obtained under the ideal solder joint state. In the actual welding process, slight differences in the length and size of the solder joints will cause changes in the antenna performance. Due to the special structural characteristics and temperature resistance requirements of the antenna, the product welding efficiency is low in the traditional laser welding method. Compared with the traditional laser welding method, the antenna layout laser welding requires: the pads of the slender solder joints are located on the microstrip line, and the round copper wire is welded close to the microstrip line without warping or offset; the amount of tin needs to be evenly distributed, the positioning requirements are high, and the amount of tin creeping within a certain distance needs to be uniform.

[0052] Traditional laser welding cannot meet the welding requirements of the antenna layout, and automatic welding using welding equipment requires pre-welding fixation between the round copper wire and the circuit board, so that the round copper wire is welded closely to the microstrip line during welding without warping or offset. The pre-welding fixation device in the related art cannot meet the above requirements.

[0053] In response to the above problems, the welding fixture provided by the exemplary embodiment of the present invention clamps the circuit board by two clamping plates, and a first groove is arranged on the first end face of the clamping plate, and the first groove has a first plane, which provides a reference and positioning for the circuit board; further, a second plane is arranged on the second end face of the clamping plate, which provides a reference and positioning for the round copper wire. Therefore, the welding fixture can provide a double reference for the circuit board and the welding strip, thereby ensuring that the circuit board and the round copper wire are straight and close to achieve precise welding.

[0054] It should be noted that the welding and fixing device provided by the exemplary embodiment of the present invention is not only applicable to antenna layouts and round copper wires used in radars, but also applicable to pre-welding fixation between other circuit boards and other welding strips except round copper wires.

[0055] Figure 1 is a schematic diagram of an exploded structure of a welding fixture according to an embodiment of the present invention; Figure 2 is a schematic diagram of a top view of a welding fixture according to an embodiment of the present invention; Figure 3 is a bottom view structural schematic diagram of a welding fixture according to an embodiment of the present invention; Figure 4 is a schematic diagram of a three-dimensional structure of a clamping plate according to an embodiment of the present invention; Figure 5 2 is a schematic diagram of the structure of the clamping plate according to an embodiment of the present invention when viewed from above. Figure 1-Figure 5 As shown, the welding fixing device provided by the exemplary embodiment of the present invention is used for fixing the circuit board 30 and the welding strip 31, and both sides of the circuit board 30 have at least one first welding pad, and the first welding pad is a slender welding pad; the fixing device includes two clamping plates 10 for clamping the circuit board 30; each clamping plate 10 has a first end face 12 for clamping the circuit board 30 and a second end face 11 opposite to the first end face 12; each clamping plate 10 has at least one first groove 121 formed on the first end face 12, and the first groove 121 matches the circuit board 30; each clamping plate 10 has at least one welding portion formed on the second end face 11, and the welding portion includes a through hole 112 and a second groove 111 connected to the through hole 112, and the through hole 112 corresponds to the first welding pad, and the bottom of the second groove 111 has a second plane, and the second plane is used to fix the welding strip 31; the bottom of the first groove 121 has a first plane, and the first plane and the second plane have a common plane, and the flatness of the common plane is less than or equal to 0.01.

[0056] In practical applications, the first grooves 121 formed on the first end surfaces of the two clamping plates 10 are opposite to each other, and the first planes of the bottoms of the two first grooves 121 are respectively attached to the front and back sides of the circuit board 30 to be welded. When the two clamping plates 10 are fixedly connected, the circuit board 30 is fixed and positioned, and the shape and size of the first grooves 121 match the circuit board 30 to be clamped. Since both sides of the circuit board 30 have elongated first pads to be welded, a welding portion is formed on each of the two clamping plates 10, wherein the welding portion is composed of a through hole 112 and a second groove 111 connected to the through hole 112, and the through hole 112 can expose the first pad on the circuit board 30 and the surrounding area so as to be welded with the welding strip 31. The bottom of the second groove 111 has a second plane, and a part of the welding strip 31 can be fixed on the second plane, thereby providing stable support and positioning, and the fixing method can be bonding or gluing. Since the second plane is coplanar with the first plane of the first groove 121, the flatness of the common plane is less than or equal to 0.01. Therefore, when the soldering strip 31 is fixed on the second plane, the other part of the soldering strip 31 can be flat and tightly attached to the first pad of the circuit board 30, such as the microstrip line of the antenna pattern, so as to fix the relative position of the soldering strip 31 and the first pad of the circuit board 30. Then, the two can be welded together by manual welding or automatic welding. This fixing method can realize automatic welding of solder joints on both sides of the circuit board through automatic welding, and can realize that the round copper wire has no warping or hanging problems after welding, thereby improving the welding qualification rate and welding efficiency.

[0057] It should be noted that one side of the circuit board 30 may have one elongated first pad or multiple first pads. When one side of the circuit board 30 has multiple first pads, multiple soldering portions may be provided at corresponding positions on the clamping plate 10 corresponding to the one side of the circuit board 30.

[0058] Furthermore, each clamping plate 10 may be formed with a first groove 121, such as Figure 5 As shown; a plurality of first grooves 121 may also be formed, such as Figure 6 When the clamping plate 10 has a plurality of first grooves 121, two clamping plates 10 can be used to clamp a plurality of circuit boards 30 at the same time, thereby improving the welding efficiency. When one clamping plate 10 has two first grooves 121, another clamping plate 10 of the same type can be used to clamp two circuit boards 30; Figure 1As shown, two other clamping plates 10 having only one first groove 121 may also be used for clamping, which is determined according to the actual situation. It should be noted that when the above two clamping plates 10 clamp the circuit board 30, the sameness of the two clamping plates 10 refers to the same general structure, and the corresponding parts of the two should be mirror images of each other. It can be understood that in the above scheme of clamping multiple circuit boards 30, corresponding welding parts should be opened on the clamping plate 10 at the corresponding position of each first pad.

[0059] It should be pointed out that the circuit board 30 and its solder strip 31 are fixed by opening a first groove 121, a through hole 112 and a second groove 111 connected to the through hole 112 on each clamping plate 10. The grooves can be machined, and in engineering, the flatness of the common plane of the first plane and the second plane can be less than or equal to 0.01. Assuming that a very thin clamping plate 10 is used to clamp the circuit board 30, on the one hand, due to the very high flatness requirements of the first plane and the second plane, it is difficult for such a thin plate to have a certain rigidity to form a good bonding effect for the entire circuit board 30; on the other hand, by clamping the clamping plate 10 with a certain thickness on both sides of the circuit board 30, due to the certain weight of the clamping plate 10 itself, a certain pressure on the circuit board 30 can be maintained, thereby achieving a better bonding effect.

[0060] The connection between the two clamping plates 10 of the welding fixture provided by the exemplary embodiment of the present invention can be various.

[0061] For example, the two clamping plates 10 are fixed by stud connection to achieve the effect of clamping the circuit board 30. It can be understood that the groove depth of the first groove 121 of the two clamping plates 10 should be less than half the thickness of the circuit board 30. When clamping, the first planes of the two first grooves 121 can be tightly fitted on the front and back sides of the circuit board 30 to form a fixation. Exemplarily, the groove depth of the first groove 121 is 0.1mm to 0.3mm, and optionally 0.2mm, which can be set according to the actual circuit board 30 to be clamped and the thickness of the clamping plate itself.

[0062] Described from another perspective, when the circuit board 30 is clamped between the two clamping plates 10, the first end faces 12 of the two clamping plates 10 do not fit together, that is, when the two clamping plates 10 are fixed in relative position using studs or screws, the two form a clearance fit. Exemplarily, the assembly clearance between the two is ≥0.1mm, that is, the distance between the first end faces 12 of the two clamping plates 10 should be ≥0.1mm.

[0063] In another optional embodiment, the two clamping plates 10 are connected by magnetic clearance fit, and the clearance of the clearance fit between the two clamping plates 10 is the same as that of fixing by stud connection, which will not be described in detail here.

[0064] When the two clamping plates 10 are connected by magnetism, the two clamping plates 10 can be fastened, which is convenient for clamping and disassembly; at the same time, for circuit boards 30 of different thicknesses, the surface contact principle can be used to achieve a straight and close fit between the soldering strip 31 and the first soldering pad, which is adaptive.

[0065] like Figure 1 and Figure 4 As shown, a plurality of magnet holes 15 can be provided on one of the two clamping plates 10, and a magnet 50 is embedded in each magnet hole 15; the other clamping plate 10 of the two clamping plates 10 can be made of ferromagnetic material; or, a magnet hole 15 can also be provided at a corresponding position on the other clamping plate 10, so that a magnet 50 is arranged therein, so as to form a magnetic attraction fixing effect between the two clamping plates 10. It is understandable that when the thickness of the circuit board 30 is very thick, a magnet 50 with strong magnetism can be arranged in the magnet hole 15 to increase the strength of the connection.

[0066] In order to firmly fix the magnet 50 in the magnet hole 15 , the magnet 50 can be fixed on the corresponding clamping plate 10 by interference fit.

[0067] Considering that when the two clamping plates 10 clamp the circuit board 30 , the first grooves 121 on the two clamping plates 10 need to be arranged relatively and accurately, and positioning mechanisms are also provided on the two clamping plates 10 . Figure 6 FIG. 2 is a schematic diagram of a three-dimensional structure of a clamping plate according to another embodiment of the present invention. Figure 1 , Figure 4 as well as Figure 6 As shown, a positioning hole 13 is provided on the clamping plate 10 located at the bottom, and a corresponding positioning hole 13 is also provided on the clamping plate 10 located at the top, wherein a positioning column is interference-connected with the positioning hole 13 of the clamping plate 10 at the bottom. After the circuit board 30 is placed on the clamping plate 10 at the bottom, the positioning column can be matched with the positioning hole 13 of the clamping plate 10 at the top, thereby ensuring the relative position relationship between the two clamping plates 10 is accurate. It can be understood that the above-mentioned positioning hole 13 can be provided in one or more positions, and the position of the positioning hole 13 at the corresponding clamping plate 10 should be in the outer area of ​​the first groove 121.

[0068] Figure 8 FIG. 2 is another exploded structural schematic diagram of a welding fixture according to an embodiment of the present invention. Figure 1 and Figure 8As shown, the welding fixture provided by the exemplary embodiment of the present invention further includes a frame 40 for accommodating two clamping plates 10 , and one of the two clamping plates 10 is fixedly connected to the frame 40 .

[0069] The frame 40 not only provides fixed support for the two clamping plates 10 , but also enables the entire frame to be mounted on an automatic welding device, so that the frame 40 can be easily flipped to the front and back sides of the circuit board 30 for welding.

[0070] like Figure 3 and Figure 8 As shown, ribs 421 are provided on two opposite inner walls of the frame 40, and the clamping plate 10 located below is fixed to the two ribs 421 by screw connection to form a positioning, while the other clamping plate 10 is connected to the clamping plate 10 below by magnetic attraction, thereby forming a fixation between the two clamping plates and the frame 40.

[0071] The welding and fixing device provided by the exemplary embodiment of the present invention further includes at least one third groove 431 formed on the inner wall of the frame 40 , and the third groove 431 is used to accommodate the electrical connector 32 of the circuit board 30 ; the third groove 431 cooperates with the corresponding electrical connector 32 .

[0072] like Figure 8 As shown, third grooves 431 are respectively provided on two opposite inner walls of the frame 40, and the electrical connectors 32 to be welded on the two circuit boards 30 are arranged in the third grooves 431 in a matching manner, so as to fix the relative positions between the circuit boards 30 and the corresponding electrical connectors 32, so that the electrical connectors 32 can be welded on the corresponding circuit boards 30, and the welding feet of the electrical connectors 32 can also fit tightly on the second welding pads of the circuit boards 30.

[0073] Exemplarily, the electrical connector 32 of the antenna layout is a SMA connector (SubMiniature version A, SMA), whose outer contour is square and has a stepped surface, and the corresponding third groove 431 should also be a square stepped hole.

[0074] In order to weld the circuit board 30 and the corresponding electrical connector 32, since the electrical connector 32 needs to be welded on both the front and back sides of the circuit board 30, a corresponding notch 16 should also be provided on each clamping plate 10 so as to expose the second pad on the circuit board 30 and facilitate automatic welding. Based on this, the frame 40 not only provides support and positioning for the two clamping plates 10, but also provides a positioning receiving groove for the electrical connector 32, thereby fixing the relative position relationship between the welding strip 31, the electrical connector 32 and the circuit board 30, and making the first pad and the second pad fit each other with the corresponding parts to be welded, so as to have a high welding qualification rate. It can be understood that the number of the third grooves 431 and the notches 16 mentioned above is determined according to the number of actual circuit boards 30 or the interface of the corresponding electrical connector. In some embodiments, the number is not further limited.

[0075] In some embodiments, the frame 40 may be formed by welding a plurality of connecting rods, or the connecting rods may be detachably connected to each other.

[0076] like Figure 8 As shown, when the connecting rods are detachably connected, the electrical connector 32 can be conveniently placed in the third groove 431 in a mating manner, and then the connecting rods are connected, fixed and enclosed to form a frame 40. This is because the solder pins of the electrical connector 32 need to be soldered on both sides of the circuit board 30, so the connecting rods are first connected to form the frame 40, and after the electrical connector 32 is placed in the connecting rod, the circuit board 30 cannot be placed.

[0077] For example, Figure 8 As shown, the frame 40 is enclosed by two first connecting rods 42 and two second connecting rods 43, wherein a rib plate 421 is provided on the inner wall of each first connecting rod 42 for fixing the corresponding clamping plate 10. The two first connecting rods 42 and the two second connecting rods 43 are fixed and enclosed by bolt connection.

[0078] In order to improve assembly efficiency, illustratively, two first connecting rods 42 and two second connecting rods 43 are connected by magnetic attraction. Figure 8 As shown, a receiving hole is provided at the end of the first connecting rod 42 for receiving the magnet 50, and a screw hole is provided at the corresponding end of the second connecting rod 43 for connecting the magnetic column 432, wherein the other end of the magnetic column 432 can be embedded in the receiving hole at the end of the first connecting rod 42 to form a magnetic connection with the magnet 50, thereby forming a fixation between the two connecting rods.

[0079] like Figure 1-Figure 3As shown, in the welding fixture provided by the exemplary embodiment of the present invention, there are connecting parts 41 on two opposite outer walls of the frame, respectively, and the connecting parts 41 are used to connect with corresponding welding devices, especially automatic welding devices. The number of connecting parts 41 on each outer wall is determined according to actual needs, and is not further limited in some embodiments. By fixing the connecting parts 41 on the automatic welding device, the welding fixture can be automatically rotated, and then the parts to be welded on both sides of the circuit board 30 can be welded.

[0080] Figure 7 is a bottom view of the structure of a clamping plate according to another embodiment of the present invention; Figure 4 and Figure 7 As shown, in the welding fixture provided by the exemplary embodiment of the present invention, the structure of the welding portion of the clamping plate 10 on the second end face 11 is formed by milling the plate-shaped clamping plate 10 by machining. Based on this, the through hole 112 has a first transition inner wall 112a, and along the direction from the second end face 11 to the first end face 12, the cross-sectional area of ​​the through hole 112 located at the first transition inner wall 112a portion decreases. For example, the through hole 112 has a tapered transition inner wall, which can facilitate the processing of a more accurate through hole 112. For the same reason, when processing the second groove 111, the second groove 111 has a second transition inner wall 111a, and along the direction from the second end face 11 to the first end face 12, the cross-sectional area of ​​the second groove 111 located at the second transition inner wall 111a portion decreases. That is, the second groove 111 processes a second plane at the bottom of the groove, and the length direction of the second plane is also the length direction of the welding strip 31, and the second transition inner wall 111a with a certain slope is provided on both sides of the length direction of the second plane.

[0081] Exemplarily, the first transition inner wall 112a and the second transition inner wall 111a are substantially inner wall surfaces connected together in adjacent areas. Through the transition inner wall of this shape structure, the first plane and the second plane can be machined to form a mechanical coplanar effect in accordance with the exemplary embodiment of the present invention, thereby ensuring a tight fit between the solder strip 31 and the first solder pad in the circuit board 30.

[0082] Considering that two clamping plates 10 are arranged in the inner cavity of the frame 40, when one clamping plate 10 is fixed on the frame 40, the other clamping plate 10 is not easy to be disassembled, and a handle needs to be provided on the clamping plate 10. For the convenience of description, take the clamping plate 10 located at the top as an example. Figure 4As shown, one or more threaded holes 14 are provided on the second end surface of the clamping plate 10, and a screw can be threadedly connected to the threaded hole 14. The screw is used as a handle to facilitate the disassembly and assembly of the clamping plate 10. For example, an M3 long screw is screwed into the threaded hole 14 as a handle, and the M3 long screw is removed during the welding process to avoid interference of the screw during the welding flipping process, which affects the welding.

[0083] An exemplary embodiment of the present invention further provides an automatic welding device, comprising a welding device and the above-mentioned welding fixture, wherein the welding fixture is rotatably connected to the welding device.

[0084] As can be seen from the above, the welding fixture provided by the exemplary embodiment of the present invention has adaptive positioning, and uses the surface contact principle, takes the plane of the circuit board itself as a reference, and realizes the straight and close welding between the round copper wire and the pad for circuit boards of different thicknesses through the magnetic connection between the two clamping plates. Especially for automatic welding equipment, by flipping the welding fixture, automatic welding on both sides of the circuit board can be realized, with high welding quality and improved welding efficiency. At the same time, the frame and clamping plate of the exemplary embodiment of the present invention can be machined to meet the straight and close fit between the welding strip and the slender pad of the circuit board, and are easy to clamp and disassemble, and are suitable for welding different types of circuit boards.

[0085] The exemplary embodiment of the present invention further provides an automatic welding method, which is applied to the above-mentioned automatic welding equipment, and the automatic welding method comprises:

[0086] Step S1, fixing one of the two clamping plates 10 on the rib plate 421, with the second end surface 11 facing upward;

[0087] Step S2, fixing a portion of the soldering strip 31 on the second plane of each clamping plate 10, and disposing another portion of the soldering strip 31 in the through hole 112 in a suspended manner;

[0088] Step S3, placing the circuit board 30 to be soldered in the first groove 121 of the clamping plate 10 fixed to the rib plate 421, wherein the reverse side of the circuit board 30 is attached to the first plane of the first groove 121;

[0089] Step S4, after connecting the handle to the other clamping plate 10 of the two clamping plates 10, place it on the circuit board 30, wherein the first plane of the first groove 121 of the other clamping plate 10 is attached to the front surface of the circuit board 30, and the two clamping plates 10 are fixed together by magnetic connection; at this time, the part of each soldering strip 31 suspended in the through hole 112 is attached to the slender first solder pad of the circuit board 30;

[0090] Step S5, remove the handle on the clamping plate 10; place the electrical connector 32 in the third groove 431 of the second connecting rod 43, assemble the two first connecting rods 42 and the second connecting rod 43 to form a frame 40; and rotatably connect the frame 40 to the welding device.

[0091] Based on this, the above-mentioned automatic welding method for circuit boards and solder strips overcomes the defects of cumbersome manual processes in traditional welding processes, and solves the problem of pre-welding fixation of circuit boards, solder strips and SMA connectors, ensuring that the back structure to be welded is not affected during the flipping process of the welding fixture, and in the case of inconsistent circuit board thickness, the solder strips and pads can be straight and close to each other for different circuit boards without warping or overhanging, thereby ensuring the automatic welding pass rate.

[0092] It should be understood by those skilled in the art that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. A welding fixture, characterized in that: Used for fixing a circuit board and a soldering strip, both sides of the circuit board have at least one first soldering pad, and the first soldering pad is an elongated soldering pad; the fixing device comprises two clamping plates for clamping the circuit board; Each of the clamping plates has a first end surface for clamping the circuit board and a second end surface opposite to the first end surface; Each of the clamping plates has at least one first groove formed on the first end surface, and the first groove matches the circuit board.

2. The fixing device according to claim 1, characterized in that: The fixing device also includes a frame for accommodating the two clamping plates, and one of the two clamping plates is fixedly connected to the frame.

3. The fixing device according to claim 2, characterized in that: The fixing device further comprises at least one third groove formed on the inner wall of the frame, wherein the third groove is used to accommodate the electrical connector of the circuit board; The third groove is matched with the corresponding electrical connector.

4. The fixing device according to claim 3, characterized in that: The circuit board has a second soldering pad connected to the electrical connector, and each of the clamping plates has at least one notch corresponding to the second soldering pad.

5. The fixing device according to claim 2, characterized in that: The frame is a frame formed by at least a plurality of connecting rods, and each of the connecting rods is fixedly connected; or, The connecting rods are detachably connected.

6. The fixing device according to claim 5, characterized in that: When the connecting rods are detachably connected, the connecting rods are connected by magnetic attraction; or, The connecting rods are connected by bolts.

7. The fixing device according to any one of claims 2 to 6, characterized in that: The fixing device further comprises at least one connecting portion respectively formed on the outer walls opposite to the frame, and the connecting portion is used to be connected to the welding device.

8. The fixing device according to any one of claims 1 to 6, characterized in that: At least one threaded hole is formed on the second end surface of at least one of the two clamping plates, and the threaded hole is used to connect the detachable handle.

9. An automatic welding device, characterized in that: It comprises a welding device and the fixing device according to any one of claims 1 to 8, wherein the fixing device is connected to the welding device.

10. An automatic welding method, characterized in that: Automatic welding is performed using the welding equipment described in any one of claims 1 to 9.

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