Mounting and positioning structure for fixing PCB mainboard

Abstract

The utility model discloses a mounting and positioning structure for fixing a PCB (printed circuit board) mainboard, which relates to the technical field of SMT (surface mount technology) dispensing and comprises a support frame, an operation table and a dispensing mechanism on the operation table. The transposition disc is arranged on the operation table, four clamping mechanisms are fixedly arranged on the transposition disc, and a fastening toothed plate and a loosening toothed plate are fixedly arranged on the operation table; the intermittent mechanism comprises a rotating shaft on the supporting frame, a rotating disc is arranged on the rotating shaft, a driving column is arranged on the rotating disc, an intermittent disc is arranged on the supporting frame, and a transmission mechanism is arranged on the intermittent disc; the transposition disc can carry out transposition on the four clamping mechanisms, so that the circuit board is replaced, the downtime of the dispensing mechanism can be effectively shortened, the transposition disc can intermittently rotate through cooperation of a driving column and an intermittent disc, and time is provided for dispensing and material changing while frequent starting and stopping of a driving motor are prevented; and clamping and loosening of the circuit board can be automatically controlled through the fastening toothed plate and the loosening toothed plate.

Description

Technical Field

[0001] This utility model relates to the field of SMT (Surface Mount Technology) adhesive dispensing, specifically to a mounting and positioning structure for fixing a PCB motherboard. Background Technology

[0002] PCB, or Printed Circuit Board, is an important electronic component. It serves as the support for electronic components and the carrier for their electrical connections. Because it is manufactured using electronic printing techniques, it is called a "printed" circuit board.

[0003] When mounting electronic components on a PCB board, a dispensing process is usually required to bond the two components together. Dispensing is mainly used to apply adhesive to surface electronic components on a PCB board (printed circuit board) for curing. The purpose of using adhesive to reinforce these surface components on the PCB board is to reduce the probability of component failure caused by factors such as temperature changes, drops, and vibrations during product use, thereby extending the product's lifespan.

[0004] For example, CN221768636U discloses an SMT (Surface Mount Technology) dispensing device, which includes a base, a worktable above the base, a clamping groove on the top of the worktable, a sealing plate fixedly connected to the top of the worktable, and a clamping mechanism on the top of the sealing plate. The clamping mechanism includes a load-bearing plate, which is fixedly connected to the rear side of the base near the bottom. The top ends of two moving rods pass through the inner cavities of adjacent moving ports and are fixedly connected to clamping plates. The device clamps the workpiece through the mutual cooperation of the clamping plates, a first rack plate, a worm gear, a second rack plate, a worm, a first servo motor, and a movable gear.

[0005] When applying adhesive to a PCB board, the PCB board needs to be positioned and clamped first. There are many positioning and clamping mechanisms in the existing technology that are similar to the above-mentioned solutions. Most of them use clamping plates to clamp the circuit board. The adhesive dispensing device and the clamping device are in the same station. When applying adhesive, the clamping plates need to be controlled to close and clamp the circuit board first. After the adhesive is applied, the clamping plates need to be released first, and then a new circuit board needs to be replaced and clamped again before the next adhesive dispensing process can be carried out. The whole operation is cumbersome. The adhesive dispensing device is in a stopped state when clamping, releasing and replacing circuit boards, which reduces the adhesive dispensing efficiency. Utility Model Content

[0006] The purpose of this invention is to provide an installation and positioning structure for fixing a PCB motherboard, so as to solve the above-mentioned shortcomings in the prior art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an installation and positioning structure for fixing a PCB motherboard, comprising a support frame and an operating table fixedly mounted on the support frame, wherein a dispensing mechanism is fixedly mounted on the operating table; a shifting plate rotatably mounted on the operating table, wherein four clamping mechanisms are fixedly mounted on the shifting plate; a fastening toothed plate and a loosening toothed plate are fixedly mounted on the operating table, wherein the fastening toothed plate and the loosening toothed plate are symmetrically arranged; and an intermittent mechanism comprising a rotating shaft rotatably mounted on the support frame, wherein a rotating disk is fixedly mounted on the rotating shaft, a drive column is fixedly mounted on the rotating disk, an intermittent disk rotatably mounted on the support frame, wherein four drive slots adapted to the drive column are opened on the intermittent disk, and a transmission mechanism is fixedly mounted on the intermittent disk.

[0008] Preferably, the dispensing mechanism includes a fixed plate fixedly mounted on the operating table, a cylinder fixedly mounted on the fixed plate, a fixed frame fixedly mounted on the top of the cylinder, two first electric slide rails fixedly mounted on the fixed frame, a second electric slide rail disposed between the two first electric slide rails, and a dispensing gun mounted on the second electric slide rail.

[0009] Preferably, each of the clamping mechanisms includes a clamping frame fixedly mounted on the transposition plate, a clamping plate slidably mounted inside each clamping frame, a screw threadedly connected to the end of each clamping frame away from the rotating shaft, and a rotating connection between the end of each screw close to the rotating shaft and each clamping plate corresponding to it.

[0010] Preferably, each of the clamping frames has a cross bar rotatably provided at the end away from the rotating shaft, each cross bar is slidably connected to each of the screws, and each cross bar has a gear fixedly provided at the end away from the rotating shaft.

[0011] Preferably, the transmission mechanism includes a drive gear disk fixedly mounted on the intermittent disk, and a driven gear ring rotatably mounted on the rotating shaft that meshes with the drive gear disk, the driven gear ring being fixedly connected to the shifting disk.

[0012] Preferably, a limiting plate is fixedly provided on the rotating disk, the limiting plate is provided with a clearance groove, and four limiting grooves that are adapted to the outer circumferential surface of the intermittent disk are provided on the outer circumferential surface of the limiting plate.

[0013] In the above technical solution, this utility model provides an installation and positioning structure for fixing a PCB motherboard, which has the following beneficial effects: the four clamping mechanisms and corresponding circuit boards can be interchanged by the shifting plate, so that the circuit board can be directly replaced without occupying the position of the dispensing station, which can effectively reduce the downtime of the dispensing mechanism. The shifting plate can be rotated intermittently by the cooperation of the drive column and the intermittent plate, which can prevent the drive motor from starting and stopping frequently while providing time for dispensing and changing materials. When the shifting plate rotates, the clamping and loosening of the circuit board can be automatically controlled by the fastening tooth plate and the loosening tooth plate. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0015] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0016] Figure 2 A schematic diagram of the support frame provided in an embodiment of this utility model;

[0017] Figure 3 This is a schematic diagram of the dispensing mechanism provided in an embodiment of the present utility model;

[0018] Figure 4 A schematic diagram of the structure of the intermittent disk provided in an embodiment of this utility model;

[0019] Figure 5 Provided for the embodiments of this utility model Figure 1 Enlarged view of the structure at point A in the middle.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Operating table; 2. Support frame; 3. Servo motor; 4. Dispensing station; 5. Unlocking station; 6. Loading / unloading station; 7. Locking station; 11. Rotating shaft; 12. Rotary disc; 13. Limiting disc; 131. Clearance groove; 14. Driven gear ring; 15. Drive column; 16. Rotating rod; 17. Intermittent disc; 171. Limiting groove; 18. Drive gear disc; 19. Drive groove; 20. Shifting disc; 21. Clamping frame; 22. Clamping plate; 23. Screw; 24. Cross bar; 25. Gear; 26. Fastening gear plate; 27. Relaxing gear plate; 31. Fixing plate; 32. Cylinder; 33. Fixing frame; 34. First electric slide rail; 35. Second electric slide rail; 36. Dispensing gun. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0023] Please see Figure 1-5 An installation and positioning structure for fixing a PCB motherboard, the technical solution proposed in this utility model includes a support frame 2 and an operating table 1 fixedly mounted on the support frame 2. A dispensing mechanism is fixedly mounted on the operating table 1. A shifting disk 20 is rotatably mounted on the operating table 1, and four clamping mechanisms are fixedly mounted on the shifting disk 20. A fastening toothed plate 26 and a loosening toothed plate 27 are fixedly mounted on the operating table 1, symmetrically arranged. An intermittent mechanism includes a rotating shaft 11 rotatably mounted on the support frame 2, a rotating disk 12 fixedly mounted on the rotating shaft 11, a drive column 15 fixedly mounted on the rotating disk 12, an intermittent disk 17 rotatably mounted on the support frame 2, four drive slots 19 adapted to the drive column 15 on the intermittent disk 17, and a transmission mechanism fixedly mounted on the intermittent disk 17. A rotating rod 16 is fixedly mounted on the support frame 2, and the intermittent disk 17 is rotatably connected to the rotating rod 16. The operating table 1 is fixedly mounted on the support frame 2, and the shifting disk 20 is rotatably positioned at the center of the operating table 1. Figure 1As shown, the operating table 1 is divided into four stations: dispensing station 4, unlocking station 5, loading / unloading station 6, and locking station 7. The fastening toothed plate 26 is located at the locking station 7, and the loosening toothed plate 27 is located at the unlocking station 5. All four clamping mechanisms are used to clamp the circuit board. When the clamped circuit board moves to the dispensing station 4, it is directly below the dispensing mechanism. At this time, the dispensing mechanism dispenses glue onto the circuit board. The drive column 15 is fixedly installed on the rotating disk 12 near its outer circumference. The four drive slots 19 on the intermittent disk 17 are adapted to the drive column 15. A servo motor 3 is fixedly installed on the support frame 2. The output end of motor 3 is fixedly connected to the rotating shaft 11. The rotation of motor 3 drives the rotating shaft 11 to rotate, which in turn drives the rotating disk 12 to rotate. As the rotating disk 12 rotates, the drive column 15 moves in a circular motion around the rotating shaft 11. When the rotating disk 12 drives the drive column 15 to rotate to the intermittent disk 17, the drive column 15 inserts into the corresponding drive slot 19. With the rotation of the rotating disk 12, the intermittent disk 17 rotates 90 degrees through the interaction of the drive column 15 and the drive slot 19. As the rotating disk 12 rotates, the drive column 15 moves out of the drive slot 19. That is, for every one revolution of the rotating disk 12, the intermittent disk 17 rotates 90 degrees. Furthermore, the intermittent disk 17 does not rotate when the drive column 15 is not in the drive groove 19. When the intermittent disk 17 rotates 90 degrees, it drives the shift disk 20 to rotate 90 degrees through the transmission mechanism. At this time, the circuit board at the dispensing station 4 moves to the unlocking station 5 to be clamped and unlocked, while the circuit board at the unlocking station 5 moves to the loading / unloading station 6. At this time, the dispensing circuit board at the loading / unloading station 6 is removed and replaced with an undispensed circuit board. The undispensed circuit board that was originally at the loading / unloading station 6 moves to the locking station 7 to be clamped. The undispensed circuit board that was originally clamped at the locking station 7 moves to the dispensing station 4 for dispensing. The rotating shaft 11 The time for one rotation is slightly longer than the time for dispensing glue to the circuit board. When the circuit board moves directly below the dispensing mechanism, the drive column 15 extends from the corresponding drive slot 19. At this time, the rotating shaft 11 no longer drives the intermittent disk 17 and the shift disk 20 to rotate, thereby fixing the position of the shift disk 20. At this time, the dispensing mechanism dispenses glue to the circuit board and can replace the circuit board on the loading and unloading station 6. This allows the dispensing, clamping, anti-loosening, and replacement of the circuit board to be performed simultaneously, reducing the downtime of the dispensing mechanism, increasing the dispensing efficiency, and preventing the glue from solidifying at the dispensing needle due to the long downtime of the dispensing mechanism.

[0024] Specifically, the dispensing mechanism includes a fixed plate 31 fixedly mounted on the operating table 1. A cylinder 32 is fixedly mounted on the fixed plate 31, and a fixed frame 33 is fixedly mounted on the top of the cylinder 32. Two first electric slide rails 34 are fixedly mounted on the fixed frame 33, and a second electric slide rail 35 is arranged between the two first electric slide rails 34. A dispensing gun 36 is mounted on the second electric slide rail 35. The fixed plate 31 is fixedly mounted on the dispensing station 4. The dispensing gun 36 dispenses glue onto the circuit board. The dispensing gun 36 can slide on the second electric slide rail 35, and both ends of the second electric slide rail 35 can slide simultaneously on the corresponding first electric slide rail 34. The above are all existing technologies and will not be elaborated on here. The cylinder 32 can control the lifting and lowering of the first electric slide rail 34 and the second electric slide rail 35, thereby controlling the lifting and lowering of the dispensing gun 36, so that the dispensing gun 36 can move in multiple directions to dispense glue to different positions on the circuit board.

[0025] Specifically, each clamping mechanism includes a clamping frame 21 fixedly mounted on the transposition plate 20. Each clamping frame 21 has a clamping plate 22 slidably mounted inside it. The end of each clamping frame 21 away from the rotating shaft 11 is threadedly connected to a screw 23. The end of each screw 23 near the rotating shaft 11 is rotatably connected to each clamping plate 22 in a corresponding manner. The four clamping frames 21 are evenly arranged on the transposition plate 20. The width of the clamping frame 21 is adapted to the circuit board, and the internal length of the clamping frame 21 is greater than that of the circuit board. When it is necessary to clamp the circuit board in the clamping frame 21, the circuit board is placed in the clamping frame 21, and then the forward rotating screw 23 is rotated to move the screw 23 towards the direction closer to the circuit board. As the clamping plate 22 moves, the circuit board is clamped in the clamping frame 21, thus fixing the circuit board. Similarly, flipping the screw 23 can move the clamping plate 22 away from the circuit board, thereby releasing the circuit board, which can then be removed from the clamping frame 21.

[0026] Specifically, each clamping frame 21 has a cross bar 24 rotatably mounted at the end away from the rotating shaft 11. Each cross bar 24 is slidably connected to each screw 23. A gear 25 is fixedly mounted at the end of each cross bar 24 away from the rotating shaft 11. Rotating the gear 25 can drive the corresponding cross bar 24 to rotate. When the cross bar 24 rotates, it can drive the corresponding screw 23 to rotate. When the screw 23 rotates, it will generate displacement on the clamping frame 21. Through the cross bar 24 slidably connected to the screw 23, the screw 23 can move while rotating with the cross bar 24. When the clamping mechanism moves with the shifting plate 20 to the unlocking toothed plate at the unlocking station 5, When the circuit board is unlocked, the unlocking tooth plate meshes with the lower side of the gear 25, causing the gear 25 to rotate and the screw 23 to move away from the rotating shaft 11. When the clamping mechanism moves to the fastening tooth plate 26 at the locking position 7, the fastening tooth plate 26 meshes with the upper side of the gear 25, causing the gear 25 to rotate and the screw 23 to move closer to the rotating shaft 11, thereby clamping the circuit board. Both the fastening tooth plate 26 and the loosening tooth plate 27 have arcs and the same length. After the gear 25 passes through the fastening tooth plate 26, the clamping plate 22 can clamp the circuit board without excessively squeezing it.

[0027] Specifically, the transmission mechanism includes a drive gear 18 fixedly mounted on the intermittent disk 17, and a driven gear ring 14 rotatably mounted on the rotating shaft 11 that meshes with the drive gear 18. The driven gear ring 14 is fixedly connected to the transposition disk 20. When the rotating disk 12 rotates, the intermittent disk 17 is driven to rotate intermittently through the cooperation of the drive column 15 and the drive groove 19. When the intermittent disk 17 rotates intermittently, it drives the drive gear 18 to rotate intermittently, and the transposition disk 20 is driven to rotate intermittently through the driven gear ring 14 meshing with the drive gear 18. That is, the rotating disk 12 rotates 360 degrees and the transposition disk 20 rotates 90 degrees, thereby providing sufficient time for dispensing and loading / unloading of the circuit board.

[0028] Specifically, a limiting disk 13 is fixedly installed on the rotating disk 12, and a clearance groove 131 is provided on the limiting disk 13. Four limiting grooves 171 that are adapted to the outer peripheral surface of the intermittent disk 17 are provided on the outer peripheral surface of the limiting disk 13. The four limiting grooves 171 on the intermittent disk 17 are symmetrically arranged. When the driving column 15 drives the intermittent disk 17 to rotate through the driving groove 19, the clearance grooves 131 are used to avoid the rotating intermittent disk 17, preventing the end corner of the intermittent disk 17 from interfering with the limiting disk 13. At the same time, when the driving column 15 does not enter the driving groove 19, the limiting grooves 171 on the intermittent disk 17 abut against the outer peripheral surface of the limiting disk 13, which can prevent the intermittent disk 17 from rotating at will and ensure the stability of the circuit board during dispensing.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mounting and positioning structure for fixing a PCB motherboard, comprising a support frame (2) and an operating table (1) fixedly mounted on the support frame (2), characterized in that, A dispensing mechanism is fixedly installed on the operating table (1); The shifting plate (20) is rotatably mounted on the operating table (1). Four clamping mechanisms are fixedly mounted on the shifting plate (20). A fastening toothed plate (26) and a loosening toothed plate (27) are fixedly mounted on the operating table (1). The fastening toothed plate (26) and the loosening toothed plate (27) are symmetrically arranged. The intermittent mechanism includes a rotating shaft (11) rotatably mounted on a support frame (2), a rotating disk (12) fixedly mounted on the rotating shaft (11), a drive column (15) fixedly mounted on the rotating disk (12), an intermittent disk (17) rotatably mounted on the support frame (2), four drive slots (19) adapted to the drive column (15) on the intermittent disk (17), and a transmission mechanism fixedly mounted on the intermittent disk (17).

2. The mounting and positioning structure for fixing a PCB motherboard according to claim 1, characterized in that, The dispensing mechanism includes a fixed plate (31) fixedly mounted on the operating table (1), a cylinder (32) fixedly mounted on the fixed plate (31), a fixed frame (33) fixedly mounted on the top of the cylinder (32), two first electric slide rails (34) fixedly mounted on the fixed frame (33), a second electric slide rail (35) is arranged between the two first electric slide rails (34), and a dispensing gun (36) is mounted on the second electric slide rail (35).

3. The mounting and positioning structure for fixing a PCB motherboard according to claim 2, characterized in that, Each clamping mechanism includes a clamping frame (21) fixedly mounted on the transposition plate (20). Each clamping frame (21) has a clamping plate (22) slidably mounted inside it. Each clamping frame (21) has a screw (23) threadedly connected to the end away from the rotating shaft (11). The end of each screw (23) near the rotating shaft (11) is rotatably connected to each clamping plate (22) in a one-to-one correspondence.

4. The mounting and positioning structure for fixing a PCB motherboard according to claim 3, characterized in that, Each clamping frame (21) has a cross bar (24) rotatably mounted at the end away from the rotating shaft (11). Each cross bar (24) is slidably connected to each screw (23) in a one-to-one correspondence. Each cross bar (24) has a gear (25) fixedly mounted at the end away from the rotating shaft (11).

5. The mounting and positioning structure for fixing a PCB motherboard according to claim 4, characterized in that, The transmission mechanism includes a drive gear disk (18) fixedly mounted on the intermittent disk (17), and a driven gear ring (14) rotatably mounted on the rotating shaft (11) and meshing with the drive gear disk (18). The driven gear ring (14) is fixedly connected to the shifting disk (20).

6. The mounting and positioning structure for fixing a PCB motherboard according to claim 5, characterized in that, A limiting disk (13) is fixedly provided on the rotating disk (12). An avoidance groove (131) is provided on the limiting disk (13). Four limiting grooves (171) that are adapted to the outer peripheral surface of the intermittent disk (17) are provided on the outer peripheral surface of the limiting disk (13).

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