Circuit board maintenance positioning platform

Abstract

The invention relates to a circuit board maintenance positioning platform, which comprises a base and two groups of sliding clamping mechanisms, each clamping mechanism comprises a plurality of clamping heads, a supporting plate and mounting columns, a driving mechanism and a sliding limiting mechanism are distributed on the supporting plate, and the mounting columns can be driven to be uniformly dispersed or drawn close to adjust the distance between the clamping heads; an over-clamping prevention mechanism is arranged between the mounting column and the clamping head, and over-clamping is avoided through a limiting switch, an electromagnet and the like; the center of the base is provided with an extensible supporting table and a positioning barrier strip to adapt to circuit boards of different sizes. The circuit board maintenance positioning platform can adaptively clamp circuit boards of different specifications, has dual anti-over-clamping protection, is stable in supporting, and improves the maintenance efficiency and safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit board production and manufacturing, in particular to a circuit board maintenance positioning platform. BACKGROUND

[0002] The circuit board, also known as the printed circuit board, is a core basic piece for providing mechanical assembly support and electrical connection for various electronic systems, and carrying the core of electronic device signal transmission, signal transceiver, and power supply, and is called the "mother of electronic products". The production of the circuit board is a precise and complex process, and the quality of each link will directly affect the performance and reliability of the final product. As a key link in production, detection runs through the whole process from design to finished product, the purpose is to find defects in time, reduce the scrap rate, and ensure that the product meets the design standard. When detecting the circuit board, a circuit board maintenance positioning platform is needed to fix it to avoid displacement of the circuit board during detection, which affects the detection operation or detection result.

[0003] At present, the existing circuit board maintenance positioning devices are divided into two categories according to the size of the circuit board: for small circuit boards, one or two pairs of clamping heads are usually used to close from both sides to the middle to achieve clamping; for large circuit boards, multiple pairs of clamping heads are usually used for two-side clamping. However, the spacing of the clamping heads of such devices is fixed and cannot be adjusted, which makes it difficult to flexibly adapt to circuit boards of different sizes, and it is even more difficult to meet the clamping needs of circuit boards with different solder distribution - if the solder-intensive area is blocked by the clamping head, it will directly affect the maintenance operation.

[0004] At the same time, the traditional clamping mechanism generally lacks effective over-clamping protection mechanism: on the one hand, the circuit board is often damaged due to improper clamping force control; on the other hand, although some devices have simple limiting structure, they cannot offset the inertia effect of the driving mechanism, and after the power is cut off, the clamping will continue due to inertia, which has a serious risk of over-clamping.

[0005] In addition, the support table of the existing device is designed with fixed size, and for large circuit boards, insufficient support area can easily cause the circuit board to tilt or even fall, which not only affects the safety of the maintenance operation, but also reduces the positioning stability. These problems together cause the existing positioning platform to have obvious limitations in universality, safety and reliability, and it is difficult to meet the diversified maintenance needs. SUMMARY

[0006] The purpose of the present application is to overcome the above technical problems and provide a circuit board maintenance positioning platform that can be easily adjusted according to the size of the circuit board.

[0007] To achieve the above object, the application adopts the following technical scheme: a circuit board maintenance positioning platform, comprising a base and two groups of clamping mechanisms slidingly arranged in the base, each group of clamping mechanisms comprising a plurality of clamping heads, the base being provided with a clamping driving mechanism for driving the clamping mechanisms to open and close and move, the clamping mechanism further comprising a support plate and mounting columns for mounting the clamping heads, the mounting columns being slidingly arranged on one side of the support plate along the front-rear direction, the support plate being provided with a distribution driving mechanism for uniformly distributing the mounting columns from front to back and a sliding limiting mechanism for limiting the mounting columns; the mounting columns being provided at the top with a telescopic slot one, the clamping heads being slidingly arranged in the telescopic slot one, the mounting columns being provided with an anti-over-clamping mechanism, the clamping heads being retracted into the telescopic slot one to trigger the anti-over-clamping mechanism, the base being provided at the top center with a support table, the support table being an expandable support table, the support table being provided at the front end with a positioning stop.

[0008] Further, the distribution driving mechanism comprises a distribution plate, distribution columns and an electric telescopic rod, the side wall of the support plate being provided with a groove, the distribution plate being slidingly arranged in the groove, the distribution plate being provided with a plurality of strip-shaped through holes, the strip-shaped through holes being radially distributed, the distribution columns being fixedly arranged on the side of the mounting columns close to the distribution plate, the distribution columns being slidingly arranged in the strip-shaped through holes, the electric telescopic rod being fixedly arranged on the support plate, and the telescopic end thereof being fixedly arranged with the distribution plate at the top.

[0009] Further, the groove and the distribution plate are provided with a sliding rail and a sliding groove, the sliding rail being fixedly arranged on the inner wall of the groove, the sliding groove being fixedly arranged on the side wall of the distribution plate, and the two being coated with lubricating oil.

[0010] Further, the sliding limiting mechanism comprises a limiting slide rod and a limiting slide block, the limiting slide block being fixedly arranged on the mounting column, the side wall of the support plate being provided with a strip-shaped groove, the limiting slide rod being fixedly arranged in the strip-shaped groove, the limiting slide block extending into the strip-shaped groove and cooperating with the limiting slide rod.

[0011] Further, the anti-over-clamping mechanism comprises a limiting switch, the limiting switch being fixedly arranged in the telescopic slot one, the clamping head being fully retracted into the telescopic slot one to press the limiting switch, the clamping head being provided with a spring one, and the two ends of the spring one being fixedly connected with the inner wall of the telescopic slot one and the clamping head.

[0012] Further, the anti-over-clamping mechanism further comprises an electromagnet and a fixed column, the mounting column being provided with a telescopic slot two arranged in the up-down direction, the fixed column being slidingly arranged in the telescopic slot two, the top of the fixed column being provided with a limiting ring made of a magnetically attractive material, the electromagnet being arranged in the telescopic slot two and capable of attracting the limiting ring, the limiting switch being electrically connected with the electromagnet, the limiting switch being pressed to make the electromagnet electrified, the telescopic slot two being further provided with a spring two, and the two ends of the spring two being fixedly connected with the fixed column and the telescopic slot two.

[0013] Further, the clamping driving mechanism comprises a bidirectional threaded rod and a driving motor, an open slot is arranged in the base, the bidirectional threaded rod is rotationally arranged in the open slot, a sliding seat is arranged at the bottom of the supporting plate, the sliding seat is slidingly arranged in the open slot, a threaded hole matched with the bidirectional threaded rod is arranged on the sliding seat, the output shaft of the driving motor is connected with the end of the bidirectional threaded rod, and the driving motor is electrically connected with the limit switch.

[0014] Further, the supporting table comprises a main body and expansion plates, receiving grooves are arranged on the top surface of the main body and left and right sides, two expansion plates are arranged, and the two expansion plates are slidingly arranged in the corresponding receiving grooves, the two expansion plates are moved to left and right sides to realize expansion, an expansion driving mechanism for driving the expansion plates to move is arranged on the main body, and the positioning blocking strip is arranged on the main body.

[0015] Further, the expansion driving mechanism comprises a strip-shaped rotating plate, connecting rods and a driving motor, a containing cavity is arranged in the main body, the strip-shaped rotating plate is rotationally arranged in the containing cavity, the two connecting rods are hingedly connected at the two ends of the strip-shaped rotating plate, and the other ends of the two connecting rods are hingedly connected with the bottoms of the expansion plates.

[0016] Further, limit blocks are arranged at the front and rear ends of the expansion plates, the cross section of the limit block is a trapezoidal structure, and trapezoidal limit grooves are arranged on the front and rear sidewalls of the receiving groove.

[0017] The beneficial effects of the present application are as follows:

[0018] 1. Self-adaptive clamping distance adjustment, adaptive to circuit boards of multiple specifications: with the ingenious design of the distribution driving mechanism, when the electric telescopic rod drives the distribution plate to slide up and down in the groove, the distribution column slides along the strip-shaped through hole, and cooperates with the layout of the bisector of the right-angled triangle distribution area, so that multiple mounting columns can be automatically and uniformly dispersed or moved close from front to back. This linkage structure can flexibly adjust the distance between the clamping heads according to the size of the circuit board, without manual adjustment, which greatly improves the adaptive ability of the equipment to circuit boards of different specifications and different solder distribution, and is especially suitable for rapid model change operation during batch maintenance.

[0019] 2. Double over-clamping protection, ensuring clamping safety: the first level of protection triggers the limit switch when the clamping head retracts into the telescopic groove, directly cutting off the driving motor, preventing the clamping mechanism from continuing to move close, and avoiding damage to the circuit board due to excessive clamping force; the second level of protection is triggered at the same time as the limit switch, and the electromagnet is energized to attract the limit block, driving the fixed column to move down and contact the inner wall of the base to form a mechanical brake, effectively resisting the inertial motion of the driving motor after power-off, and completely eliminating the over-clamping risk. The double protection mechanism cooperates with each other to provide reliable clamping safety protection for the precision circuit board.

[0020] 3. The expandable support platform enhances the stability of load bearing: the support table adopts the combined structure of the main body and the expansion plate, the strip-shaped rotating plate is rotated through the expansion driving mechanism, the expansion plate is expanded to both sides through the connecting rod, and the support area can be dynamically adjusted according to the size of the circuit board. In cooperation with the positioning ridge at the front end, the circuit board can be stably supported in the circumferential direction, avoiding the inclination and falling of the circuit board due to insufficient support area, especially suitable for the maintenance positioning of large circuit boards, and significantly improving the load reliability of the equipment.

[0021] 4. Fine structure design improves operation fluency: the sliding rail and sliding groove between the distribution plate and the groove are matched and coated with lubricating oil, reducing the operation friction of the distribution driving mechanism; the sliding limiting mechanism ensures that the mounting column does not deviate and is not jammed in the sliding process through the precise cooperation of the limiting slide and the limiting block; spring one and spring two in the anti-over-clamping mechanism not only assist the clamping head and the fixing column to reset, but also buffer the impact force in the clamping process. These detailed designs jointly guarantee the stability and durability of the equipment operation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of a circuit board maintenance positioning platform of the present application;

[0023] Figure 2 is a structural schematic diagram of the clamping mechanism in the present application;

[0024] Figure 3 is a perspective structural schematic diagram of the mounting column in the present application;

[0025] Figure 4 is an exploded view of the mounting column and its parts in the present application;

[0026] Figure 5 is a structural schematic diagram of the support table in the expanded state from the top view;

[0027] Figure 6 is a structural schematic diagram of the support table in the expanded state from the bottom view;

[0028] Figure 7 is a perspective structural schematic diagram of the support table in the unexpanded state;

[0029] Figure 8 is a structural schematic diagram of the internal structure of the base;

[0030] Figure 9 is a control circuit diagram between the limit switch, the driving motor and the electromagnet in the present application.

[0031] 1. Base; 2. Clamping mechanism; 3. Clamping head; 4. Support plate; 5. Mounting column; 6. Telescopic groove one; 7. Distribution plate; 8. Distribution column; 9. Groove; 10. Strip-shaped through hole; 11. Electric telescopic rod; 12. Support platform; 13. Slide rail; 14. Slide groove; 15. Limiting slide rod; 16. Limiting slider; 17. Strip-shaped groove; 18. Limiting switch; 19. Spring one; 20. Electromagnet; 21. Fixed column; 22. Telescopic groove two; 23. Limiting ring; 24. Spring two; 25. Bidirectional threaded rod; 26. Drive motor; 27. Main body; 28. Extension plate; 29. ​​Storage groove; 30. Strip-shaped rotating plate; 31. Connecting rod; 32. Drive motor; 33. Receiving cavity; 34. Limiting block; 35. Limiting groove; 36. Positioning stop bar; 37. Opening groove; 38. Sliding seat. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0033] Embodiments of the present invention: such as Figures 1-9 As shown, a circuit board inspection and positioning platform includes a base 1 and two sets of clamping mechanisms 2 slidably disposed within the base 1. Each set of clamping mechanisms 2 includes multiple clamping heads 3. The base 1 is provided with a clamping drive mechanism for driving the clamping mechanism 2 to open and close. The clamping mechanism 2 also includes a support plate 4 and mounting posts 5 for mounting the clamping heads 3. The multiple mounting posts 5 are slidably disposed on one side of the support plate 4 in the front-to-back direction. The support plate 4 is provided with a distribution drive mechanism for driving the mounting posts 5 to be evenly distributed from front to back and a sliding limit mechanism for limiting the mounting posts 5. The top of the mounting post 5 is provided with a telescopic groove 6, and the clamping heads 3 are slidably disposed within the telescopic groove 6. The mounting post 5 is provided with an anti-over-clamping mechanism, which is triggered when the clamping heads 3 retract into the telescopic groove 6. The center of the top of the base 1 is provided with a support platform 12, which is an expandable support platform. The front end of the support platform 12 is provided with a positioning stop bar 36.

[0034] Through the above structure, before the maintenance, the spacing between the clamping heads 3 can be adjusted according to the size of the current production batch of circuit board or the position of the soldering points. For the circuit board with regular shape and no soldering points on the edge, the clamping heads 3 on the two clamping mechanisms 2 should be aligned. The spacing between the clamping heads 3 on the two clamping mechanisms 2 can be adjusted individually, so that when there are soldering points or components on the edge of the circuit board, the spacing between the clamping heads 3 can be adjusted flexibly according to the distribution. Before clamping, the edge of the circuit board is first abutted against the positioning stopper 36 to ensure accurate positioning, and then clamping is performed. During clamping, the clamping heads 3 first contact the edge of the circuit board, and as the clamping mechanisms 2 gradually approach, the clamping heads 3 retract into the telescopic grooves 6, thereby triggering the anti-over-clamping mechanism to control the clamping driving mechanism to stop moving, effectively preventing over-clamping.

[0035] As shown in Figure 2 , 3 , the distribution driving mechanism includes a distribution plate 7, a distribution column 8 and an electric telescopic rod 11. The side wall of the support plate 4 is provided with a groove 9, the distribution plate 7 is slidingly arranged in the groove 9, the distribution plate 7 is provided with a plurality of strip-shaped through holes 10, the strip-shaped through holes 10 are distributed in a radial manner (the extension lines converge at a center point), the distribution column 8 is fixedly arranged on one side of the mounting column 5 close to the distribution plate 7, the distribution column 8 is slidingly arranged in the strip-shaped through hole 10, and the electric telescopic rod 11 is fixedly arranged on the support plate 4, and the telescopic end is fixedly arranged with the top of the distribution plate 7.

[0036] It is worth noting that during the movement of the distribution column 8 along the strip-shaped through hole 10, the spacing between the distribution columns 8 is always equal.

[0037] The groove 9 and the distribution plate 7 are provided with a sliding rail 13 and a sliding groove 14, the sliding rail 13 is fixed on the inner wall of the groove 9, the sliding groove 14 is fixed on the side wall of the distribution plate 7, and lubricating oil is applied between the two.

[0038] Through the above structure, the distribution plate 7 is driven to move up and down through the telescopic action of the electric telescopic rod 11. Since the distribution column 8 and the strip-shaped through hole 10 on the distribution plate 7 are in sliding fit, during the movement of the distribution plate 7, the mounting column 5 can be driven to move synchronously, and then the clamping heads 3 are moved, thereby realizing the approaching and separating functions of the clamping heads 3. During the up and down movement of the distribution plate 7, the sliding rail 13 and the sliding groove 14 cooperate with each other and are coated with lubricating oil, which effectively reduces the running friction of the distribution driving mechanism and ensures that the movement is more stable and smooth.

[0039] As shown in Figure 2As shown, the sliding limiting mechanism comprises a limiting slide 15 and a limiting slide block 16, the limiting slide block 16 is fixedly arranged on the mounting column 5, a strip-shaped slot 17 is arranged on the side wall of the supporting plate 4, the limiting slide 15 is fixedly arranged in the strip-shaped slot 17, and the limiting slide block 16 extends into the strip-shaped slot 17 and cooperates with the limiting slide 15.

[0040] Through the above structure, the movement of the mounting column 5 can be effectively constrained through the cooperative limiting action of the limiting slide 15 and the limiting slide block 16, so as to avoid the skewing phenomenon during the movement in the front and back directions.

[0041] As shown in Figure 3 , 4 , the anti-over-clamping mechanism comprises a limiting switch 18, the limiting switch 18 is fixed in the telescopic slot one 6, the clamping head 3 can press the limiting switch 18 when it is completely retracted into the telescopic slot one 6, the clamping head 3 is provided with a spring one 19, and the two ends of the spring one 19 are respectively connected with the inner wall of the telescopic slot one 6 and the clamping head 3.

[0042] It is worth mentioning that the side of the mounting column 5 contacting the circuit board and the side of the clamping head 3 contacting the circuit board can be provided with a silica gel pad to avoid hard contact and protect the circuit board.

[0043] Through the above structure, when the clamping head 3 contacts the circuit board, it is pressed and retracted into the telescopic slot one 6, thereby triggering the limiting switch 18. At this time, the spring one 19 is deformed. In the process of releasing the circuit board, the spring one 19 gradually restores to its original state and drives the clamping head 3 to reset.

[0044] As shown in Figure 2 , 3 , the anti-over-clamping mechanism further comprises an electromagnet 20 and a fixed column 21, the telescopic slot two 22 arranged in the up and down directions is arranged in the mounting column 5, the fixed column 21 is arranged in the telescopic slot two 22 in the up and down sliding mode, the fixed column 21 is provided with a limiting ring 23 at the top, the limiting ring 23 is made of magnetic material, the electromagnet 20 is arranged in the telescopic slot two 22 and can attract the limiting ring 23, the limiting switch 18 is electrically connected with the electromagnet 20, the limiting switch 18 is pressed down to make the electromagnet electrified, the telescopic slot two 22 is further provided with a spring two 24, and the two ends of the spring two 24 are respectively fixedly connected with the fixed column 21 and the telescopic slot two 22.

[0045] Through the above structure, when the limiting switch 18 is pressed down, the electromagnet 20 is immediately electrified to attract the limiting ring 23, thereby driving the fixed column 21 to move downward so that the bottom thereof contacts the inner wall bottom of the base 1 to realize the brake function and avoid over-clamping.

[0046] As shown in Figure 2 , 8As shown, the clamping driving mechanism comprises a bidirectional threaded rod 25 and a driving motor 26, the base 1 is provided with an open slot 37, the bidirectional threaded rod 25 is rotationally arranged in the open slot 37, the bottom of the support plate 4 is provided with a sliding seat 38, the sliding seat 38 is slidingly arranged in the open slot 37, and the sliding seat 38 is provided with a threaded hole matched with the bidirectional threaded rod 25, the output shaft of the driving motor 26 is connected with the end of the bidirectional threaded rod 25, and the driving motor 26 is electrically connected with the limit switch 18, and the limit switch 18 stops the forward rotation of the driving motor 26 when being pressed.

[0047] Through the above structure, the driving motor 26 drives the bidirectional threaded rod 25 to rotate, which can drive the support plates 4 to move close to each other or separate, thereby driving the clamping head 3 to move close to the middle or separate, realizing the clamping and loosening of the circuit board, and when the limit switch 18 is pressed, the driving motor 26 stops rotating forward, avoiding excessive clamping.

[0048] As shown in Figure 1 , 5 , 6, 7, the support table 12 comprises a main body 27 and an expansion plate 28, the top surface of the main body 27 is provided with receiving grooves 29 on the left and right sides, the expansion plate 28 is provided with two, and is slidingly arranged in the corresponding receiving groove 29, the two expansion plates 28 move to the left and right sides to realize expansion, and the main body 27 is provided with an expansion driving mechanism for driving the expansion plate 28 to move; and the positioning stop bar 36 is arranged on the main body 27.

[0049] Through the above structure, in the process of clamping the circuit board, the front end of the circuit board is tightly abutted against the positioning stop bar 36, realizing accurate positioning in the front and back directions. At the same time, with the driving of the expansion driving mechanism, the expansion plate 28 moves accordingly, which can effectively expand the support table 12, thereby adapting to the support demand of larger size circuit boards and preventing them from being skewed or falling off.

[0050] As shown in Figure 5 , 6 , 7, the expansion driving mechanism comprises a strip-shaped rotating plate 30, a connecting rod 31 and a driving motor 32, the main body 27 is provided with a containing cavity 33, the strip-shaped rotating plate 30 is rotationally arranged in the containing cavity 33, the connecting rod 31 is provided with two, and is hingedly connected at both ends of the strip-shaped rotating plate 30, and the other end of the connecting rod 31 is hingedly connected with the bottom of the expansion plate 28.

[0051] Through the above structure, the rotation angle of the driving motor 32 is controlled within 90°, so as to prevent the expansion plate 28 from being separated from the receiving groove 29. When it is needed to expand the support table 12, the strip-shaped rotating plate 30 is rotated by the driving motor 32, and then the connecting rod 31 is driven to move, pushing the expansion plate 28 to move outward, realizing the expansion of the support table. If it is needed to retract the expansion plate 28, the driving motor 32 can be simply reversed.

[0052] AsFigure 5 、 6 As shown in the drawings, the extension plate 28 is provided with a limiting block 34 at both front and rear ends, the limiting block 34 is in a trapezoidal structure in cross section, and the trapezoidal limiting groove 35 is correspondingly provided on the front and rear sidewalls of the receiving groove 29.

[0053] Through the above structure, the displacement trajectory of the extension plate 28 is accurately controlled to ensure smooth movement, thereby realizing the extension or folding function.

[0054] Working principle:

[0055] According to the size of the circuit board, the width of the support table 12 is adjusted. When the circuit board is large, the driving motor 32 drives the strip-shaped rotating plate 30 to rotate, thereby driving the connecting rod 31 to act and push the extension plate 28 to move to both sides to expand the support surface. The circuit board is placed on the support table 12, and the front end of the circuit board is tightly abutted against the positioning stop bar 36. Then, the distribution plate 7 is driven by the electric telescopic rod 11 to move up and down to adjust the distance between the clamping heads 3 to adapt to the width of the circuit board or avoid the welding points and components.

[0056] Then, the driving motor 26 drives the bidirectional threaded rod 25 to rotate forward, so that the clamping mechanism 2 is close to the middle. When the edge of the circuit board contacts the clamping head 3, the clamping head 3 is squeezed to retract into the telescopic groove 6. After clamping, the limit switch 18 is pressed down, so that the power supply of the driving motor 26 is disconnected, and the forward rotation is stopped. At the same time, the electromagnet 20 is electrified to attract the limiting ring 23 to move downward, drive the fixed column 21 to move downward, so that the bottom contacts the inner bottom surface of the base 1, realize the brake function, further avoid excessive clamping, and ensure that the circuit board is not clamped and deformed.

[0057] When the circuit board is repaired, the driving motor 26 is controlled to rotate reversely by the control button, and the electromagnet is de-energized and the limit switch is released, so that the two clamping mechanisms 2 move to both sides to release the circuit board, and the circuit board can be taken out.

[0058] It should be noted that, in the present document, the terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0059] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since various modifications can be made by those skilled in the art, without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

[0060] The above description of the application and its embodiments is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the application, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired by it, without departing from the purpose of the application, without creating a similar structure and embodiment of the technical solution, it should belong to the protection scope of the application.

Claims

1. A circuit board maintenance positioning platform, comprising a base (1) and two groups of clamping mechanisms (2) slidingly arranged in the base (1), each group of clamping mechanisms (2) comprising a plurality of clamping heads (3), and a clamping driving mechanism is arranged in the base (1) to drive the clamping mechanisms (2) to open and close, characterized in that: The clamping mechanism (2) further comprises a support plate (4) and a mounting column (5) for mounting the clamping head (3), a plurality of mounting columns (5) are slidingly arranged on one side of the support plate (4) in the front-rear direction, the support plate (4) is provided with a distribution driving mechanism for uniformly dispersing the mounting columns (5) from front to back and a sliding limiting mechanism for limiting the mounting columns (5); the top of the mounting column (5) is provided with a telescopic slot (6), the clamping head (3) is slidingly arranged in the telescopic slot (6), the mounting column (5) is provided with an anti-over-clamping mechanism, the clamping head (3) retracts into the telescopic slot (6) to trigger the anti-over-clamping mechanism, the top center of the base (1) is provided with a support table (12), the support table (12) is an expandable support table, and the front end of the support table (12) is provided with a positioning baffle (36). ​ 2. The circuit board access positioning platform of claim 1, wherein: The distribution driving mechanism comprises a distribution plate (7), a distribution column (8) and an electric telescopic rod (11), the side wall of the support plate (4) is provided with a groove (9), the distribution plate (7) is slidingly arranged in the groove (9), the distribution plate (7) is provided with a plurality of strip-shaped through holes (10), the strip-shaped through holes (10) are radially distributed, the distribution column (8) is fixedly arranged on one side of the mounting column (5) close to the distribution plate (7), the distribution column (8) is slidingly arranged in the strip-shaped through hole (10), and the electric telescopic rod (11) is fixedly arranged on the support plate (4) and is fixedly arranged at the top of the distribution plate (7) at the telescopic end.

3. The circuit board access positioning platform of claim 2, wherein: The groove (9) and the distribution plate (7) are provided with a sliding rail (13) and a sliding groove (14), the sliding rail (13) is fixed on the inner wall of the groove (9), the sliding groove (14) is fixed on the side wall of the distribution plate (7), and lubricating oil is applied therebetween.

4. The circuit board access positioning platform of claim 1, wherein: The sliding limiting mechanism comprises a limiting slide rod (15) and a limiting slide block (16), the limiting slide block (16) is fixedly arranged on the mounting column (5), the side wall of the support plate (4) is provided with a strip-shaped groove (17), the limiting slide rod (15) is fixedly arranged in the strip-shaped groove (17), and the limiting slide block (16) extends into the strip-shaped groove (17) and cooperates with the limiting slide rod (15).

5. The circuit board access positioning platform of claim 1, wherein: The anti-over-clamping mechanism comprises a limiting switch (18), the limiting switch (18) is fixed in the telescopic slot (6), the clamping head (3) can press the limiting switch (18) when it is completely retracted into the telescopic slot (6), the clamping head (3) is provided with a spring (19), and the two ends of the spring (19) are fixedly connected with the inner wall of the telescopic slot (6) and the clamping head (3).

6. The circuit board access positioning platform of claim 5, wherein: The anti-over-clamping mechanism further comprises an electromagnet (20), a fixed column (21), a second telescopic slot (22) arranged in the up-down direction is arranged in the mounting column (5), the fixed column (21) is arranged in the second telescopic slot (22) in the up-down direction, a limiting ring (23) is arranged at the top of the fixed column (21), the limiting ring (23) is made of magnetic material, the electromagnet (20) is arranged in the second telescopic slot (22) and can attract the limiting ring (23), the limiting switch (18) is electrically connected with the electromagnet (20), the limiting switch (18) is pressed down to make the electromagnet be electrified, and the second telescopic slot (22) is further provided with a second spring (24), and the two ends of the second spring (24) are fixedly connected with the fixed column (21) and the second telescopic slot (22) respectively.

7. The circuit board access positioning platform of claim 5, wherein: The clamping driving mechanism comprises a bidirectional threaded rod (25) and a driving motor (26), the base (1) is provided with an open slot (37), the bidirectional threaded rod (25) is rotatably arranged in the open slot (37), the bottom of the supporting plate (4) is provided with a sliding seat (38), the sliding seat (38) is slidably arranged in the open slot (37), and a threaded hole matched with the bidirectional threaded rod (25) is arranged on the sliding seat (38), the output shaft of the driving motor (26) is connected with the end of the bidirectional threaded rod (25), and the driving motor (26) is electrically connected with the limiting switch (18).

8. The circuit board access positioning platform of claim 1, wherein: The supporting table (12) comprises a main body (27) and an expansion plate (28), the top surface of the main body (27) is provided with receiving grooves (29) on the left and right sides, the expansion plate (28) is provided with two, and the two expansion plates (28) are slidably arranged in the corresponding receiving grooves (29), the two expansion plates (28) are moved to the left and right sides to realize expansion, and the main body (27) is provided with an expansion driving mechanism for driving the expansion plate (28) to move; and the positioning baffle (36) is arranged on the main body (27).

9. The circuit board access positioning platform of claim 8, wherein: The expansion driving mechanism comprises a strip-shaped rotating plate (30), a connecting rod (31) and a driving motor (32), the main body (27) is provided with a containing cavity (33), the strip-shaped rotating plate (30) is rotatably arranged in the containing cavity (33), the connecting rod (31) is provided with two and is hingedly connected at the two ends of the strip-shaped rotating plate (30), and the other end of the connecting rod (31) is hingedly connected with the bottom of the expansion plate (28).

10. The circuit board access positioning platform of claim 8, wherein: The expansion plate (28) is provided with a limiting block (34) at the front end and the rear end, the limiting block (34) is of trapezoidal structure in cross section, and trapezoidal limiting grooves (35) are arranged on the front and rear sidewalls of the receiving groove (29) correspondingly.

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