Circuit board positioning tool

Abstract

The invention relates to the technical field of circuit board manufacturing, in particular to a circuit board positioning tool which comprises an assembly frame, a clamping unit for clamping a main circuit board is arranged on the upper portion of the bottom wall of the assembly frame, and the lower portion of the top wall of the assembly frame is connected with a limiting unit for clamping an auxiliary circuit board through a position adjusting unit. The auxiliary circuit boards in different shapes can be clamped and fixed by adopting the limiting units, so that the adaptability to the auxiliary circuit boards is improved, the distance between the lower contacts of the auxiliary circuit boards and the main circuit board is uniform, the contacts of the auxiliary circuit boards can accurately abut against the main circuit board, and the working efficiency of the auxiliary circuit boards is improved. According to the auxiliary circuit board alignment device, the columnar piece is adopted to drive the expansion piece to be inserted into the positioning hole in the main circuit board, the expansion piece can abut against the inner wall of the positioning hole in a self-adaptive mode by synchronously moving the expansion piece, and therefore the stability of the auxiliary circuit board in the welding process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit board manufacturing, in particular to a circuit board positioning tool. Background Art

[0002] When the functions of a circuit board are more complex, in order to facilitate design, production, maintenance, and upgrades, specific functional modules will be independently designed into auxiliary circuit boards and then soldered to the main circuit board. In large-scale production, some circuits are designed into standardized auxiliary circuit boards, which can be mass-produced and tested in advance. Then, when assembling the main circuit board, these auxiliary circuit boards can be directly soldered on. This can reduce the production complexity of the main circuit board and improve overall production efficiency and yield.

[0003] At present, for the alignment welding of the auxiliary circuit board and the main circuit board, a special jig is usually designed to limit the auxiliary circuit board. The special jig is fixed with positioning pins, and positioning holes are opened on the main circuit board. During welding, the positioning pins of the special jig are inserted into the positioning holes so that the contacts of the auxiliary circuit board correspond to the welding positions on the main circuit board.

[0004] However, this method can only align and fix a specific auxiliary circuit board. When the shape of the auxiliary circuit board changes, the jig needs to be designed and manufactured again according to the shape of the auxiliary circuit board. The adaptability of the jig is poor. In addition, due to the gap between the pins and the positioning holes, the correspondence between the auxiliary circuit board and the main circuit board is not accurate enough, which can easily lead to the misalignment of the auxiliary circuit board and the main circuit board due to jitter during welding, resulting in cold solder joints. Summary of the Invention

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a circuit board positioning tool, including a component frame, a clamping unit for clamping the main circuit board is provided on the upper part of the bottom wall of the component frame, and a limiting unit for clamping the auxiliary circuit board is connected to the lower part of the top wall of the component frame through a positioning unit.

[0006] The positioning unit includes an alignment portion arranged at the lower part of the top wall of the component frame, the lower part of the alignment portion is connected to a lifting plate for sliding in the vertical direction, the lower part of the lifting plate is connected to an inverted L-shaped plate and a columnar member through a distance adjustment portion, and the inside of the columnar member is provided with expansion members that slide along its radial direction at equal intervals along its circumference, the lower part of the expansion member is in an arc structure on the side away from the axis of the columnar member, and a driving part is provided on the columnar member to drive the expansion member to move synchronously.

[0007] The limit unit includes a sliding plate that is slidingly arranged on the vertical section of the inverted L-shaped plate, and a rotating column is arranged to rotate inside the sliding plate. An angle plate is fixedly installed on the side of the rotating column away from the sliding plate, and two symmetrically arranged clamping frame plates are provided on the side of the angle plate away from the vertical section of the inverted L-shaped plate to slide along the length direction of the angle plate. A bidirectional screw that is threadably connected to the two clamping frame plates is rotatably arranged on the angle plate, and an L-shaped supporting plate is hinged at the lower part of the vertical section of the inverted L-shaped plate. A coil spring is arranged between the upper part of the sliding plate and the inverted L-shaped plate. The limit unit also includes a locking part for simultaneously locking the angle and position of the angle plate.

[0008] Preferably, the alignment portion includes a semicircular arc groove opened on the top wall of the component frame and passing through the top wall up and down, bolts are inserted in the semicircular arc groove and in the middle of the top wall of the component frame, and a notch plate is provided at the lower part of the top wall of the component frame, and both bolts pass through the notch of the notch plate.

[0009] Preferably, a T-shaped piece is rotatably provided at one end of the lower part of the slotted plate, the horizontal section of the T-shaped piece is connected to the lifting plate for upward and downward sliding via a guide column fixedly installed on the upper part of the lifting plate, an electric push rod is fixedly installed inside the vertical section of the T-shaped piece, and the telescopic section of the electric push rod is fixedly connected to the lifting plate.

[0010] Preferably, the distance adjustment part includes a bidirectional coarse adjustment screw rotatably arranged inside the lifting plate, a columnar member is slidably connected to its lower part along the length direction of the lifting plate, the lower part of the lifting plate is slidably connected to a fine adjustment plate along its length direction, and the fine adjustment plate and the upper part of the columnar member are both threadedly connected to the bidirectional coarse adjustment screw.

[0011] Preferably, the distance adjustment part also includes a fine-tuning screw rotatably arranged inside the horizontal section of the inverted L-shaped plate, and a turntable member threadedly connected to the fine-tuning screw is slidably arranged on the upper part of the horizontal section of the inverted L-shaped plate, and the turntable member is rotatably connected to the inside of the fine-tuning plate.

[0012] Preferably, the driving part includes a pneumatic push rod fixedly installed on the upper inner side of the columnar member, a pushing rod is provided in the middle inner side of the columnar member for sliding up and down, the pushing rod is fixedly connected to the telescopic section of the pneumatic push rod, the lower part of the pushing rod is a conical structure, and a return spring is provided between the upper part of the expansion member and the columnar member.

[0013] Preferably, the locking portion includes a C-shaped square rod slidingly arranged along the thickness direction of the sliding plate on the side away from the angle plate, a push spring is arranged between the C-shaped square rod and the sliding plate, slots for inserting the C-shaped square rod are provided at equal intervals along the circumference on the side surface of the rotating column away from the angle plate, and square grooves for inserting the C-shaped square rod are provided at equal intervals along the vertical direction on the side of the vertical section of the inverted L-shaped plate away from the angle plate.

[0014] Preferably, the locking portion also includes two sliding rods that slide on the left and right sides of the vertical section of the inverted L-shaped plate along the thickness direction of the plate, and the two sliding rods are both slidably connected to the U-shaped square rod along their own length direction. The two hinges between the support plate and the inverted L-shaped plate are provided with cams fixedly connected to the support plate, and the cams rotate to push the corresponding sliding rods.

[0015] Preferably, the locking portion also includes a fan-shaped plate fixedly mounted on the lower side of the vertical section of the inverted L-shaped plate, the fan-shaped plate and the support plate are hinged at a coaxial line, two positioning grooves arranged perpendicular to each other are provided on the fan-shaped plate, the upper sliding portion of the support plate is provided with an insertion rod, and a pushing spring is provided between the insertion rod and the support plate.

[0016] Preferably, a plurality of top columns are fixedly installed on the middle part of the side of the angle plate away from the sliding plate, a top plate is slidingly provided inside the clamping frame plate along its width direction, a clamping frame plate is extended from the side of the top plate close to the middle part of the sliding plate, and abutment spring is provided between the top plate and the clamping frame plate.

[0017] The beneficial effects of the present invention are: 1. The present invention adopts a limiting unit to clamp and fix auxiliary circuit boards of different shapes, and the support plate and the locking part cooperate to adjust the auxiliary circuit board to a horizontal arrangement of the lower contacts, thereby increasing the adaptability of the auxiliary circuit board and making the spacing between the lower contacts of the auxiliary circuit board and the main circuit board uniform, thereby enabling the contacts of the auxiliary circuit board to accurately rest on the main circuit board, increasing the accuracy of alignment.

[0018] 2. The present invention uses a columnar member to drive the expansion member to be inserted into the interior of the positioning hole on the main circuit board. By synchronously moving the expansion member, the expansion member can be adaptively pressed against the inner wall of the positioning hole, thereby increasing the stability of the auxiliary circuit board during welding and preventing the occurrence of welding misalignment. The synchronously moving expansion member can adapt to positioning holes with different inner diameters, thereby increasing adaptability.

[0019] 3. The present invention adopts a distance adjustment part to adjust the distance between the expansion piece and the angle plate, so as to adapt to the different situations of the main circuit board positioning hole distance and the welding position, thereby increasing applicability, and the distance adjustment part can adjust the distance between the expansion piece and the angle plate by coarse adjustment and fine adjustment, thereby increasing the accuracy of the distance adjustment, and further increasing the accuracy of the auxiliary circuit board to the main circuit board welding position. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and examples.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2It is a cross-sectional view of the component frame, alignment part, bidirectional coarse adjustment screw, and electric push rod in the present invention.

[0023] Figure 3 It is a cross-sectional view of the limit unit, lifting plate, distance adjustment part, inverted L-shaped plate, columnar part, expansion support part, and driving part in the present invention.

[0024] Figure 4 It is a cross-sectional view of the columnar part, expansion support part, and pushing rod in the present invention.

[0025] Figure 5 It is a cross-sectional view of the fine adjustment screw, inverted L-shaped plate, and limit unit in the present invention.

[0026] Figure 6 It is a cross-sectional view of the inverted L-shaped plate, sliding plate, supporting plate, locking part, and rotating column in the present invention.

[0027] Figure 7 It is a cross-sectional view of the sliding plate, U-shaped square rod, slot, and rotating column in the present invention.

[0028] Figure 8 It is Figure 2 A schematic diagram of the state of change of the part positions in (looking from the bottom view).

[0029] Figure 9 It is a schematic plan view before the position of the alignment part in the present invention changes.

[0030] Figure 10 It is a schematic plan view after the position of the alignment part in the present invention changes.

[0031] In the figure: 1. Component frame; 2. Clamping unit; 3. Position adjustment unit; 4. Limit unit; 31. Alignment part; 32. Lifting plate; 33. Distance adjustment part; 34. Inverted L-shaped plate; 35. Columnar part; 36. Expansion support part; 37. Driving part; 41. Sliding plate; 42. Angle plate; 43. Clamping frame plate; 44. Supporting plate; 45. Locking part; 46. Bidirectional screw; 47. Rotating column; 311. Semi-circular groove; 312. Bolt; 313. Grooved plate; 314. T-shaped part; 315. Electric push rod; 331. Bidirectional coarse adjustment screw; 332. Fine adjustment plate; 333. Fine adjustment screw; 334. Turntable part; 371. Pneumatic push rod; 372. Pushing rod; 421. Top column; 422. Top plate; 451. U-shaped square rod; 452. Slot; 453. Square groove; 454. Sliding rod; 455. Cam; 456. Sector plate; 457. Positioning groove; 458. Plug rod. Specific implementation manners

[0032] The following embodiments of the present invention are described in detail. The embodiments described below are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in the art or in the product specifications shall be followed.

[0033] See Figure 1 、 Figure 2 and Figure 3 A circuit board positioning tool comprises a component frame 1, a clamping unit 2 for clamping a main circuit board is provided on the upper part of the bottom wall of the component frame 1, and a limiting unit 4 for clamping an auxiliary circuit board is connected to the lower part of the top wall of the component frame 1 through a positioning unit 3.

[0034] When the auxiliary circuit board needs to be soldered to the main circuit board, the auxiliary circuit board is first fixed on the limiting unit 4, and then the main circuit board is clamped on the clamping unit 2. The limiting unit 4 can adjust the lower part of the auxiliary circuit board to a horizontal posture, so that the auxiliary circuit board can be more conveniently docked with the main circuit board. At the same time, the lower part of the auxiliary circuit board can be adjusted to a certain distance from the main circuit board, so as to facilitate the rapid docking of the auxiliary circuit board to the main circuit board. Subsequently, the contact position of the auxiliary circuit board is matched to the welding position on the main circuit board through the adjusting unit 3.

[0035] Continue reading Figure 1 、 Figure 2 and Figure 3 The positioning unit 3 includes a positioning portion 31 arranged at the lower part of the top wall of the component frame 1. The lower part of the positioning portion 31 is slidably connected to a lifting plate 32 in the vertical direction. The lower part of the lifting plate 32 is connected to an inverted L-shaped plate 34 and a columnar member 35 through a distance adjusting portion 33. The distance adjusting portion 33 is used to adjust the distance between the columnar member 35 and the lifting plate 32.

[0036] See Figure 3 and Figure 5 The limiting unit 4 includes a sliding plate 41 that is slidingly arranged on the vertical section of the inverted L-shaped plate 34, and a rotating column 47 is rotatably arranged inside the sliding plate 41. An angle plate 42 is fixedly installed on the side of the rotating column 47 away from the sliding plate 41. Two symmetrically arranged clamping frame plates 43 are slid along the length direction of the angle plate 42 on the side of the angle plate 42 away from the vertical section of the inverted L-shaped plate 34. A bidirectional screw 46 that is threadedly connected to the two clamping frame plates 43 is rotatably provided on the angle plate 42. The lower part of the vertical section of the inverted L-shaped plate 34 is hinged with an L-shaped supporting plate 44, and a coil spring is provided between the upper part of the sliding plate 41 and the inverted L-shaped plate 34.

[0037] See Figure 3A plurality of top columns 421 are fixedly installed on the middle part of the angle plate 42 away from the sliding plate 41, and a top plate 422 is slidingly provided inside the clamping frame plate 43 along its width direction. The clamping frame plate 43 is extended from the side of the top plate 422 close to the middle of the sliding plate 41, and a supporting spring is provided between the top plate 422 and the clamping frame plate 43.

[0038] From the attached Figure 3 From a 3D perspective, the two clamping frames 43 are arranged symmetrically, with the top plate 422 sliding in the front-to-back direction. Initially, the support plate 44 is located below the horizontal section of the inverted L-shaped plate 34. To secure the auxiliary circuit board, it is placed between the two clamping frames 43, resting against the top post 421. The operator then manually rotates the bidirectional screw 46, causing it to move the two clamping frames 43 toward the auxiliary circuit board.

[0039] When the two clamping frames 43 are about to be clamped on the auxiliary circuit board, the operator manually pulls up the angle plate 42, so that the angle plate 42 drives the sliding plate 41 to move up synchronously through the rotating column 47, so that the sliding plate 41 pre-compresses the coil spring. At the same time, the operator manually pulls the two top plates 422 forward to the front side of the auxiliary circuit board, and then continues to move the clamping frame 43, so that the clamping frame 43 drives the top plate 422 on it to move to a position that fits the front side of the auxiliary circuit board.

[0040] Then, the external force on the top plate 422 is removed, so that the supporting spring pushes the top plate 422 backward to rest on the auxiliary circuit board through its own elastic force, and the top plate 422 pushes the auxiliary circuit board backward to rest on the top column 421, thereby preliminarily limiting the auxiliary circuit board through the top column 421 and the top plate 422.

[0041] Then continue to move the clamping frame 43 so that it is clamped on both sides of the auxiliary circuit board, so that the clamping frame 43 clamps and fixes the auxiliary circuit board, and at the same time connects the angle plate 42, the rotating column 47 and the auxiliary circuit board into a whole, and then remove the external force on the angle plate 42, so that the coil spring drives the angle plate 42 to move downward through its own elastic force, and the angle plate 42 drives the lower side of the auxiliary circuit board to rest against the upper side of the support plate 44.

[0042] This ensures that the distance between the lower side of the auxiliary circuit board and the main circuit board in the initial state is always consistent, so that each time the auxiliary circuit board is moved downward by the same distance, it can be moved into contact with the main circuit board, preventing the occurrence of cold solder joints caused by false contact. If the lower side of the auxiliary circuit board is arranged at an angle, when the lower side of the auxiliary circuit board rests on the support plate 44, the reaction force of the support plate 44 on the auxiliary circuit board drives the auxiliary circuit board to rotate to a position where its lower side is horizontal, and the auxiliary circuit board simultaneously drives the rotating column 47 to rotate.

[0043] See Figure 3 、 Figure 5 、 Figure 6 and Figure 7 The limiting unit 4 also includes a locking portion 45 for simultaneously locking the angle and position of the angle plate 42. The locking portion 45 includes a C-shaped square rod 451 that is slidably arranged along the thickness direction of the sliding plate 41 on the side away from the angle plate 42. A push spring is arranged between the C-shaped square rod 451 and the sliding plate 41. Slots 452 for inserting the C-shaped square rod 451 are provided at equal intervals along the circumference of the side surface of the rotating column 47 away from the angle plate 42. Square grooves 453 for inserting the C-shaped square rod 451 are provided at equal intervals along the vertical direction on the side of the vertical section of the inverted L-shaped plate 34 away from the angle plate 42.

[0044] See Figure 5 、 Figure 6 and Figure 7 The locking portion 45 also includes two sliding rods 454 that slide along the thickness direction of the vertical section of the inverted L-shaped plate 34 on its left and right sides respectively. The two sliding rods 454 are both slidably connected to the C-shaped square rod 451 along their own length direction. The two hinges between the supporting plate 44 and the inverted L-shaped plate 34 are each provided with a cam 455 fixedly connected to the supporting plate 44. The cam 455 rotates and pushes the corresponding sliding rod 454. It should be noted that the sliding rod 454 and the C-shaped square rod 451 can slide relative to each other longitudinally, but cannot slide relative to each other laterally.

[0045] See Figure 5 The locking portion 45 also includes a fan-shaped plate 456 fixedly installed on the lower part of the side of the vertical section of the inverted L-shaped plate 34. The fan-shaped plate 456 is coaxially arranged with the hinge of the supporting plate 44. Two positioning grooves 457 arranged perpendicular to each other are provided on the fan-shaped plate 456. The upper sliding portion of the supporting plate 44 is provided with an insertion rod 458, and a push spring is provided between the insertion rod 458 and the supporting plate 44.

[0046] In the initial state, the push spring pushes the insertion rod 458 upward through its own elastic force and inserts it into the positioning groove 457 at the corresponding position of the fan-shaped plate 456, so that the support plate 44 is connected to the inverted L-shaped plate 34 into a whole through the insertion rod 458, thereby fixing the position of the support plate 44 and being able to support and push the lower part of the auxiliary circuit board.

[0047] When the lower side of the auxiliary circuit board is completely against the upper side of the support plate 44, the operator manually pulls the insertion rod 458 downward to the positioning groove 457 where it exits the corresponding position, and then the operator rotates the support plate 44 away from the angle plate 42, so that the support plate 44 drives the insertion rod 458 to move synchronously. When the support plate 44 starts to rotate, the external force on the insertion rod 458 is removed, so that the insertion rod 458 is pushed against the curved surface of the fan plate 456 by the push of the jacking spring.

[0048] And when the supporting plate 44 starts to rotate, the supporting plate 44 drives the cam 455 to rotate synchronously, so that the cam 455 pushes the sliding rod 454 at the corresponding position forward, and the sliding rod 454 pulls the C-shaped square rod 451 and simultaneously gets stuck into the slot 452 and the square groove 453 at the corresponding position, thereby locking the angle of the rotating column 47 and the position of the sliding plate 41 through the C-shaped square rod 451, thereby connecting the auxiliary circuit board and the inverted L-shaped plate 34 into a whole.

[0049] When the support plate 44 drives the insertion rod 458 to rotate to the position of another positioning groove 457, the push spring pushes the insertion rod 458 to be inserted into the inside of the other positioning groove 457, thereby connecting the support plate 44 to the inverted L-shaped plate 34 into a whole again, and making the support plate 44 no longer located at the bottom of the auxiliary circuit board, thereby preventing the support plate 44 from obstructing the contact between the auxiliary circuit board and the main circuit board.

[0050] See Figure 3 and Figure 4 , expansion members 36 that slide radially are arranged at equal intervals along the circumference of the columnar member 35, and the lower part of the expansion member 36 is in an arc structure on the side away from the axis of the columnar member 35. A driving part 37 that drives the expansion member 36 to move synchronously is provided on the columnar member 35, and the driving part 37 includes a pneumatic push rod 371 fixedly mounted on the upper inner part of the columnar member 35, and a pushing rod 372 is provided on the middle part of the inner side of the columnar member 35 for sliding up and down. The pushing rod 372 is fixedly connected to the telescopic section of the pneumatic push rod 371, and the lower part of the pushing rod 372 is in a conical structure. A return spring is provided between the upper part of the expansion member 36 and the inner wall of the columnar member 35.

[0051] See Figure 1 、 Figure 2 、 Figure 8 、 Figure 9 and Figure 10 The alignment portion 31 includes a semicircular arc groove 311 opened on the top wall of the component frame 1 and passing through the top wall up and down. Bolts 312 are inserted into the semicircular arc groove 311 and the middle of the top wall of the component frame 1. A notch plate 313 is provided at the lower part of the top wall of the component frame 1, and two bolts 312 pass through the notch of the notch plate 313.

[0052] In the initial state, the telescopic section of the pneumatic push rod 371 is in a retracted state, so that the return spring pushes the expansion members 36 against each other through its own elastic force, and the two bolts 312 are in an unlocked state in the initial state, thereby allowing the slot plate 313 to be freely adjusted in the horizontal direction at the lower part of the top wall of the component frame 1.

[0053] See Figure 1 、 Figure 2 and Figure 8A T-shaped piece 314 is rotatably provided at one end of the lower part of the slot plate 313. The T-shaped piece 314 is fixedly connected to the slot plate 313 by a locking screw. The horizontal section of the T-shaped piece 314 is connected to the lifting plate 32 for sliding up and down through a guide column fixedly installed on the upper part of the lifting plate 32. An electric push rod 315 is fixedly installed inside the vertical section of the T-shaped piece 314, and the telescopic section of the electric push rod 315 is fixedly connected to the lifting plate 32.

[0054] When the support plate 44 is no longer located at the bottom of the auxiliary circuit board, the telescopic section of the electric push rod 315 is extended and the operator manually moves the columnar member 35 to the coaxial position of the positioning hole of the main circuit board. The electric push rod 315 drives the lifting plate 32 to move downward, and the lifting plate 32 drives the expansion member 36 to move downward through the columnar member 35 to be inserted into the positioning hole of the main circuit board.

[0055] See Figure 1 、 Figure 3 and Figure 5 The distance adjustment part 33 includes a bidirectional coarse adjustment screw 331 rotatably arranged inside the lifting plate 32, and the columnar member 35 is slidably connected to its lower part along the length direction of the lifting plate 32. The lower part of the lifting plate 32 is slidably connected to the fine adjustment plate 332 along its length direction. The fine adjustment plate 332 and the upper part of the columnar member 35 are both threadedly connected to the bidirectional coarse adjustment screw 331.

[0056] Continue reading Figure 1 、 Figure 3 and Figure 5 The distance adjustment part 33 also includes a fine-tuning screw 333 rotatably arranged inside the horizontal section of the inverted L-shaped plate 34, and a turntable member 334 threadedly connected to the fine-tuning screw 333 is slidably arranged on the upper part of the horizontal section of the inverted L-shaped plate 34. The turntable member 334 is rotatably connected to the inside of the fine-tuning plate 332, and a fastening screw is rotatably provided on the fine-tuning plate 332 to lock it with the turntable member 334.

[0057] When the expansion piece 36 is inserted into the positioning hole of the main circuit board, the lifting plate 32 drives the inverted L-shaped plate 34 to move downward synchronously through the fine-tuning plate 332 to the lower side of the auxiliary circuit board and fit on the main circuit board. Then the operator manually moves the auxiliary circuit board to the welding position on the main circuit board, so that the auxiliary circuit board rotates around the positioning hole of the main circuit board through the expansion piece 36, so that the T-shaped piece 314 drives the slot plate 313 to move synchronously.

[0058] At the same time, the T-shaped piece 314 is rotated so that the vertical section of the T-shaped piece 314 is located in the center between the welding position on the main circuit board and the positioning hole thereon, and the horizontal section of the T-shaped piece 314 is located on the line connecting the welding position on the main circuit board and the positioning hole thereon. Then the operator manually rotates the two-way coarse adjustment screw 331 to drive the fine adjustment plate 332 and the columnar piece 35 to move, thereby adjusting the distance between the fine adjustment plate 332 and the columnar piece 35, so that the fine adjustment plate 332 drives the auxiliary circuit board to move to the welding position on the main circuit board through the turntable piece 334.

[0059] Afterwards, the operator rotates the auxiliary circuit board so that the contacts on the auxiliary circuit board are aligned with the welding positions on the main circuit board. The auxiliary circuit board drives the turntable part 334 to rotate synchronously through the inverted L-shaped plate 34, and then locks the position of the notch plate 313 by tightening the two bolts 312. At the same time, the operator tightens the locking screw to lock the rotation angle of the T-shaped part 314, and then tightens the fastening screw to lock the rotation angle of the turntable part 334, thereby aligning the auxiliary circuit board with the main circuit board.

[0060] Then, the telescopic section of the pneumatic push rod 371 is extended, so that the pneumatic push rod 371 is driven to move downward, and the push rod 372 pushes all the expansion members 36 away from the axis of the columnar member 35 through the conical structure at the bottom thereof, so that the expansion members 36 are pressed against the inner wall of the positioning hole of the main circuit board, thereby further locking the position of the auxiliary circuit board to prevent the auxiliary circuit board from being misaligned with the main circuit board during welding.

[0061] It should be noted that the position and angle of the T-shaped member 314, the distance between the fine-tuning plate 332 and the columnar member 35, and the rotation angle of the turntable member 334 only need to be adjusted and locked once. When replacing the auxiliary circuit board of the same shape for welding, the auxiliary circuit board can be directly moved down to the welding position on the main circuit board. If there are multiple welding positions on a main circuit board, the same number of circuit board positioning and fixing components can be set according to the number of welding positions, and the auxiliary circuit board can be welded to the main circuit board through assembly line operations.

[0062] Due to the differences in manufacturing processes for different auxiliary circuit boards of the same shape, there are certain deviations in the contact positions of the auxiliary circuit boards. When there are deviations, the operator rotates the fine-tuning plate 332 through the turntable 334 and the inverted L-shaped plate 34 to assist the circuit board in moving and fine-tuning to a certain position, thereby ensuring its accurate correspondence with the main circuit board.

[0063] When aligning the auxiliary circuit board, the present invention includes the following steps: the first step is to clamp the main circuit board on the clamping unit 2, place the auxiliary circuit board between the two clamping frame plates 43, limit the auxiliary circuit board by the clamping frame plates 43 and the top plate 422, and drive the lower side of the auxiliary circuit board to rest against the upper side of the support plate 44 through the coil spring, so that the support plate 44 pushes the lower side of the auxiliary circuit board to a horizontal level.

[0064] In the second step, the insertion rod 458 is manually pulled downward, and then the operator rotates the support plate 44 away from the angle plate 42, so that the U-shaped square rod 451 locks the angle of the rotating column 47 and the position of the sliding plate 41. The insertion rod 458 is then inserted into the inside of another positioning groove 457, thereby connecting the support plate 44 to the inverted L-shaped plate 34 into a whole again, and making the support plate 44 no longer located at the bottom of the auxiliary circuit board.

[0065] In the third step, the telescopic section of the electric push rod 315 is extended to drive the expansion member 36 to move downward to the inside of the positioning hole for inserting into the main circuit board, and the contacts of the auxiliary circuit board are manually moved to the welding position of the main circuit board. Then the operator locks the position of the notch plate 313, T-shaped member 314, and turntable member 334, so that the auxiliary circuit board is aligned with the main circuit board.

[0066] In the fourth step, the telescopic section of the pneumatic push rod 371 is extended to drive the expansion member 36 to press against the inner wall of the positioning hole of the main circuit board, thereby further locking the position of the auxiliary circuit board to prevent the auxiliary circuit board from being misaligned with the main circuit board during welding.

[0067] In the fifth step, when the auxiliary circuit board is replaced after welding, the operator moves the fine-tuning plate 332 to fine-tune the auxiliary circuit board to the correct alignment with the main circuit board, and then extends the telescopic section of the electric push rod 315 to drive the auxiliary circuit board to align with the main circuit board.

[0068] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention, which are still covered by the scope of protection of the present invention.

Claims

1. A circuit board positioning tool, comprising a component frame (1), wherein a clamping unit (2) for clamping a main circuit board is provided on the upper portion of the bottom wall of the component frame (1), characterized in that: The lower part of the top wall of the component frame (1) is connected to a limiting unit (4) for clamping the auxiliary circuit board via a positioning unit (3); The positioning unit (3) comprises a positioning portion (31) arranged at the lower part of the top wall of the component frame (1); the lower part of the positioning portion (31) is connected to a lifting plate (32) in a vertical sliding direction; the lower part of the lifting plate (32) is connected to an inverted L-shaped plate (34) and a columnar member (35) through a distance adjustment portion (33); and the columnar member (35) is provided with expansion members (36) that slide in the radial direction thereof at equal intervals along its circumference. The limiting unit (4) comprises a sliding plate (41) arranged on the vertical section of the inverted L-shaped plate (34) for sliding up and down, a rotating column (47) is arranged for rotation inside the sliding plate (41), an angle plate (42) is fixedly installed on the side of the rotating column (47) away from the sliding plate (41), two symmetrically arranged clamping frame plates (43) are arranged for sliding along the length direction of the angle plate (42) on the side of the angle plate (42) away from the vertical section of the inverted L-shaped plate (34), a top plate (422) is arranged for sliding along the width direction of the clamping frame plate (43), a support plate (44) is hinged to the lower part of the vertical section of the inverted L-shaped plate (34) and is used to support and level the bottom of the auxiliary circuit board, a coil spring is arranged between the upper part of the sliding plate (41) and the inverted L-shaped plate (34), and the limiting unit (4) further comprises a locking portion (45) for simultaneously locking the angle and position of the angle plate (42); After the auxiliary circuit board is fixed by the clamping frame plate (43) and the top plate (422), the expansion member (36) is inserted into the positioning hole on the main circuit board for positioning, and the auxiliary circuit board is rotated around the expansion member (36) by moving the limiting unit (4), thereby finding the correct welding position.

2. A circuit board positioning tool according to claim 1, characterized in that: The alignment portion (31) comprises a semicircular arc groove (311) formed on the top wall of the component frame (1) and penetrating the top wall from top to bottom. Bolts (312) are inserted into the semicircular arc groove (311) and the middle of the top wall of the component frame (1). A notch plate (313) is provided at the lower part of the top wall of the component frame (1). Two bolts (312) pass through the notches of the notch plate (313). When the position of the auxiliary circuit board is aligned with the welding position, the bolts (312) are tightened to lock the notch plate (313).

3. A circuit board positioning tool according to claim 2, characterized in that: A T-shaped piece (314) is rotatably provided at one end of the lower portion of the notch plate (313); the horizontal section of the T-shaped piece (314) is connected to the lifting plate (32) in an upward and downward sliding manner via a guide column fixedly installed on the upper portion of the lifting plate (32); an electric push rod (315) is fixedly installed inside the vertical section of the T-shaped piece (314); and the telescopic section of the electric push rod (315) is fixedly connected to the lifting plate (32).

4. The circuit board positioning tool according to claim 1, characterized in that: The distance adjustment portion (33) includes a bidirectional coarse adjustment screw (331) rotatably arranged inside the lifting plate (32); a columnar member (35) is slidably connected to the lower portion of the lifting plate (32) along the length direction; a fine adjustment plate (332) is slidably connected to the lower portion of the lifting plate (32) along the length direction; and the fine adjustment plate (332) and the upper portion of the columnar member (35) are both threadedly connected to the bidirectional coarse adjustment screw (331).

5. A circuit board positioning tool according to claim 4, characterized in that: The distance adjustment portion (33) further comprises a fine-tuning screw (333) rotatably arranged inside the horizontal section of the inverted L-shaped plate (34); a turntable member (334) threadedly connected to the fine-tuning screw (333) is slidably arranged on the upper portion of the horizontal section of the inverted L-shaped plate (34); and the turntable member (334) is rotatably connected to the inside of the fine-tuning plate (332).

6. The circuit board positioning tool according to claim 1, characterized in that: The lower part of the expansion member (36) is in an arc-shaped structure on one side away from the axis of the columnar member (35). The columnar member (35) is provided with a driving part (37) for driving the expansion member (36) to move synchronously. The driving part (37) includes a pneumatic push rod (371) fixedly mounted on the upper inner part of the columnar member (35). A pushing rod (372) is provided in the middle inner part of the columnar member (35) for sliding up and down. The pushing rod (372) is fixedly connected to the telescopic section of the pneumatic push rod (371). The lower part of the pushing rod (372) is in a conical structure. A return spring is provided between the upper part of the expansion member (36) and the columnar member (35).

7. The circuit board positioning tool according to claim 1, characterized in that: The locking portion (45) comprises a C-shaped square rod (451) slidingly arranged along the thickness direction of the sliding plate (41) on the side away from the angle plate (42); a push spring is arranged between the C-shaped square rod (451) and the sliding plate (41); slots (452) for inserting the C-shaped square rod (451) are provided at equal intervals along the circumference of the side surface of the rotating column (47) away from the angle plate (42); and square grooves (453) for inserting the C-shaped square rod (451) are provided at equal intervals along the vertical direction on the side of the vertical section of the inverted L-shaped plate (34) away from the angle plate (42).

8. The circuit board positioning tool according to claim 7, characterized in that: The locking portion (45) further comprises two sliding rods (454) which slide along the thickness direction of the vertical section of the inverted L-shaped plate (34) on the left and right sides thereof, respectively. The two sliding rods (454) are both slidably connected to the U-shaped square rod (451) along their own length direction. The two hinged joints between the supporting plate (44) and the inverted L-shaped plate (34) are both provided with cams (455) which are fixedly connected to the supporting plate (44). The cams (455) rotate to push the corresponding sliding rods (454).

9. The circuit board positioning tool according to claim 7, characterized in that: The locking portion (45) further comprises a fan-shaped plate (456) fixedly mounted on the lower side of the vertical section of the inverted L-shaped plate (34), the fan-shaped plate (456) and the support plate (44) are coaxially arranged at a hinge point, two mutually perpendicular positioning grooves (457) are provided on the fan-shaped plate (456), an insert rod (458) is provided on the upper sliding portion of the support plate (44), and a push spring is provided between the insert rod (458) and the support plate (44).

10. The circuit board positioning tool according to claim 1, characterized in that: A plurality of top columns (421) are fixedly installed on the middle part of the side of the angle plate (42) away from the sliding plate (41); a clamping frame plate (43) extends from the side of the top plate (422) close to the middle part of the sliding plate (41); abutting springs are provided between the top plate (422) and the clamping frame plate (43); and a bidirectional screw (46) is rotatably provided on the angle plate (42) and is threadedly connected to the two clamping frame plates (43).

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