Circuit board detection mechanism

Abstract

The invention discloses a circuit board detection mechanism which comprises a base, a frame body is arranged on the base, transverse electric lead screws are installed on the two sides of the base, two longitudinal electric lead screws are arranged between the two transverse electric lead screws in a sliding mode, and two moving frames are arranged on the two longitudinal electric lead screws in a sliding mode respectively. A second limiting assembly is arranged on the tops of the two moving frames located on the front side, and a first limiting assembly is arranged on the tops of the two moving frames located on the rear side. A pushing block is used for integrally pressing down a limiting assembly II and a limiting assembly I until the limiting assembly I and the limiting assembly II compress a telescopic rod to drive a circuit board to move downwards, and an electromagnet of an external power supply is started to perform positive and negative alternating current work so as to change an electrode; the electrode is used for attracting and pushing a semicircular magnet piece on the first limiting assembly and a quarter magnet piece on the second limiting assembly, so that a circuit board is driven to vibrate up and down, and welding spot detection is carried out on the circuit board through the vibration.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit board detection, and in particular to a circuit board detection mechanism. Background Art

[0002] With the continuous development of technology, printed circuit boards are becoming thinner and thinner, so the circuits are becoming more and more dense, and the number of layers is increasing. In traditional backward technology, printed circuit boards are generally inspected by human eyes. The existing technology uses a circuit board inspection machine to inspect printed circuit boards. The principle is to collect image information of the printed circuit board under test and compare it with the image information of the qualified circuit board to detect whether the printed circuit board under test is a qualified part. Therefore, using a circuit board inspection machine to inspect PCB boards (i.e. printed circuit boards) is far more mature, accurate and efficient than manual testing; The circuit board detection mechanism in the existing equipment uses the vibration and / or knocking of the detection part to perform strength detection on the solder joints on the circuit board, detect whether there are hidden cracks, whether the stress intensity meets the standard, and identify defective products when cracks and other problems appear after knocking and vibration. This direct contact detection method will cause certain damage to the circuit board itself, and some larger and thinner circuit boards are difficult to control the vibration size during vibration detection due to their own structural reasons. If the force is small, the detection purpose cannot be achieved. If the force is large, the middle area of ​​the circuit board will produce a large amplitude and affect the circuit board structure, which does not meet the safety detection requirements.

[0003] Therefore, it is necessary to provide a circuit board detection mechanism to solve the above technical problems. Summary of the invention

[0004] The object of the present invention is to provide a circuit board detection mechanism to solve the problem that the circuit board detection mechanism of the prior art proposed in the above background technology utilizes the knocking of a small hammer to perform strength detection on the solder joints on the circuit board, and identifies defective products when cracks and other problems appear after the knocking vibration. This detection method will cause damage to the circuit board itself and does not meet the purpose of safety detection.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a circuit board detection mechanism, comprising a base, a frame body is arranged on the base, transverse electric screws are installed on both sides of the base, two longitudinal electric screws are arranged to slide between the two transverse electric screws, two mobile racks are arranged to slide on the two longitudinal electric screws, a limiting component 2 is arranged on the top of the two mobile racks located on the front side, and a limiting component 1 is arranged on the top of the two mobile racks located on the rear side, a telescopic rod is arranged between the limiting component 1 and the limiting component 2 and the mobile rack, and a spring 1 is sleeved on the outer side of the telescopic rod; A semicircular magnet sheet is arranged on the first limiting component, and the first limiting component and the semicircular magnet sheet are connected via a second spring; The limiting component 2 includes a semicircular bottom plate fixedly connected to the mobile frame through a telescopic rod, an arc-shaped guide block is arranged on the semicircular bottom plate, and the arc-shaped guide blocks on the two mobile frames form an opening for introducing the circuit board, a quarter magnet sheet is arranged on one side of the top of the semicircular bottom plate, and the quarter magnet sheet and the semicircular bottom plate are fixedly connected by a spring 3, a limiting component 3 is arranged on the front side of the limiting component 2, and one end of the bottom of the limiting component 3 is obliquely inserted into the interior of the mobile frame and is slidably connected between the mobile frame, and the bottom of one end of the limiting component 3 extending to the interior of the mobile frame is fixedly connected to a spring 4 for elastically supporting the limiting component 3; A lifting device is installed at the rear side of the frame, and a fixed disc is fixed on one end of the lifting device extending to the center position of the top of the base, and four pressing components are arranged in a circular array on the outside of the fixed disc, and the four pressing components correspond to the two limit components 1 and 2; The pressing component includes a bamboo-jointed telescopic rod hinged to the bottom of the fixed disc, a top cover is fixedly arranged at one end of the bamboo-jointed telescopic rod, and a pushing block is arranged on one side of the top cover for compressing the telescopic rod downwardly for the two limit assemblies 1 and the limit assemblies 2 during the descending process of the fixed disc, a spring 6 is fixedly connected to the bottom of the top cover, and an electromagnet of an external power supply is fixedly connected to the bottom of the spring 6 for pressing the circuit board and compressing the spring 2 during the downward movement of the fixed disc, and during the pressing process of the electromagnet of the external power supply, the circuit board will be accurately placed in the limit position of the limit assembly 3 and the limit assembly 1 due to the guidance of the limit assembly 3.

[0006] As a further solution of the present invention: the limiting component three includes an L-shaped guide block fixedly connected to the spring four, and a plurality of rotatable longitudinal electric screws are arranged on the guide surface on the top side of the L-shaped guide block to promote the guide movement during the downward pressing process of the circuit board.

[0007] As a further solution of the present invention: an insert plate is provided at the bottom of the base, and a plurality of circular holes are opened on the base and the insert plate, wherein an amplitude control component is provided in one of the circular holes, and the amplitude control component can be adjusted and inserted into one of the circular holes in the circuit board according to the setting of the plurality of circular holes.

[0008] As a further solution of the present invention: the amplitude control component includes a fixing part threadedly connected to the plug plate, the top of the fixing part is threadedly connected to a main rod, a fixed ring is fixedly arranged on the main rod, a movable ring is arranged on the top of the fixed ring and is connected to the movable ring by a spring five, a slider is arranged on the top of the movable ring and is slidably connected to the main rod, and the slider is provided with an inwardly retractable limiting rod for inserting into the circular hole of the circuit board so that the circuit board is placed between the limiting rod and the movable ring to limit the amplitude of the middle position of the circuit board.

[0009] As a further solution of the present invention: the sliding block is placed on one side of the main rod, the top thereof is fixedly connected to the main rod with a spring seven, and an elastic sliding connection is formed with the main rod through the spring seven.

[0010] As a further solution of the present invention: the inner side of the slider is embedded with an electromagnet 2 which attracts and contracts the limit rod after power is turned on, and a touch switch is provided at the bottom of the electromagnet of the external power supply and is electrically connected to the electromagnet 2.

[0011] As a further solution of the present invention: the fixing piece is threadedly connected to the plug plate and the top thereof extends to the bottom of the base, and the bottom of the main rod penetrates the base and is threadedly connected to the fixing piece.

[0012] As a further solution of the present invention: the bamboo-jointed telescopic rod is fixedly connected to the fixed disc by threads and is fixed after adjusting the angle by tightening or loosening the bolts.

[0013] As a further solution of the present invention: a loading platform is fixedly arranged on the top of one side of the frame, and the height points of the loading platform, the semicircular magnet sheet, the quarter magnet sheet and the L-shaped guide block are on the same horizontal plane.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the present invention, the circuit board can be inserted between the two arc-shaped guide blocks along the top surface of the loading platform and guided between the two limit components 2, and then extended to the two limit components 1, and then the lifting device is started to press down the fixed disc and multiple pressing components, and the circuit board is initially fixed by the electromagnet of the external power supply on the pressing component, and then the limit component 2 and the limit component 1 are pressed down as a whole by the pushing block, until the limit component 1 and the limit component 2 compress the telescopic rod to drive the circuit board to move downward, and then the electromagnet of the external power supply is started to work with positive and negative alternating current to change the electrode, and the electrode is used to absorb and push the semicircular magnet sheet on the limit component 1 and the quarter magnet sheet on the limit component 2, so as to drive the circuit board to vibrate up and down, and the vibration frequency is adjustable, and the solder joint detection of the circuit board is performed by this vibration, which is safer than the traditional knocking; 2. When inspecting large circuit boards or some relatively thin circuit boards, the amplitude of the intermediate position is controlled to avoid damage to the circuit board due to excessive amplitude in the process of up and down vibration, so that the present invention can be applied to the inspection of some special circuit boards. During this period, the touch switch on the electromagnet of the external power supply is used. When the electromagnet of the external power supply is not in contact with the top of the limit component 1 and the limit component 2, the limit rod is closed inside the slider. At this time, the electromagnet 2 is energized and adsorbed. After the contact, the current of the electromagnet 2 reverses to generate a repulsive force on the limit rod to push the limit rod outward, and then the limit rod enters the round hole under the pressure of the downwardly moving circuit board. After the downward pressure component moves upward as a whole, the touch switch on the electromagnet of the external power supply loses contact, and the limit rod is adsorbed back, which is convenient for the disassembly of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 is a side view of the present invention; Figure 3 The present invention Figure 2 A partial enlarged view of part B in the middle; Figure 4 The present invention Figure 2 A partial enlarged view of the middle part; Figure 5 is a bottom view of the present invention; Figure 6 The present invention Figure 5 A partial enlarged view of the middle C part; Figure 7 It is a schematic diagram of the three-dimensional structure of the limiting component 2 of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the amplitude control component of the present invention; Fig. 9 It is a schematic diagram of the second installation structure of the electromagnet of the present invention; Fig.10 It is a schematic diagram of the main rod and the fixing member installation structure of the present invention.

[0017] In the figure: 1, mobile frame; 2, base; 3, horizontal electric screw; 4, frame; 5, lifting device; 6, fixed disc; 7, pressing assembly; 701, bamboo telescopic rod; 702, top cover; 703, spring six; 704, electromagnet of external power supply; 705, pushing block; 8, feeding platform; 9, longitudinal electric screw; 10, limit assembly one; 11, limit assembly two; 1101, arc guide block; 1102, semicircular bottom plate; 1103, One quarter magnet piece; 12, limit assembly three; 1201, L-shaped guide block; 1202, limit convex block; 13, spring four; 15, telescopic rod; 16, semicircular magnet piece; 17, plug plate; 18, amplitude control assembly; 181, main rod; 182, spring seven; 183, slider; 184, moving ring; 185, spring five; 186, fixed ring; 187, fixing piece; 188, electromagnet two; 189, limit rod; 19, roller. DETAILED DESCRIPTION

[0018] like Figures 1 to 7 As shown, a circuit board detection mechanism comprises a base 2, a frame body 4 is arranged on the base 2, transverse electric screws 3 are installed on both sides of the base 2, two longitudinal electric screws 9 are arranged to slide between the two transverse electric screws 3, two mobile racks 1 are arranged to slide on the two longitudinal electric screws 9, a limiting component 2 11 is arranged on the top of the two mobile racks 1 located on the front side, and a limiting component 1 10 is arranged on the top of the two mobile racks 1 located on the rear side, and a telescopic rod 15 is arranged between the limiting component 10 and the limiting component 2 11 and the mobile rack 1, and a spring 1 is sleeved on the outer side of the telescopic rod 15; The limiting component 10 is provided with a semicircular magnet sheet 16 and the limiting component 10 and the semicircular magnet sheet 16 are connected via a spring 2; The limiting component 11 includes a semicircular bottom plate 1102 fixedly connected to the mobile frame 1 through a telescopic rod 15, an arc-shaped guide block 1101 is arranged on the semicircular bottom plate 1102, and the arc-shaped guide blocks 1101 on the two mobile frames 1 form an opening for introducing the circuit board, a quarter magnet sheet 1103 is arranged on one side of the top of the semicircular bottom plate 1102, and the quarter magnet sheet 1103 is fixedly connected to the semicircular bottom plate 1102 through a spring three, a limiting component 12 is arranged on the front side of the limiting component 11, and one end of the bottom of the limiting component 12 is obliquely inserted into the interior of the mobile frame 1 and is slidably connected to the mobile frame 1, and the bottom of one end of the limiting component 12 extending to the interior of the mobile frame 1 is fixedly connected to a spring four 13 for elastic support of the limiting component 12; A lifting device 5 is installed at the rear side of the frame 4. A fixed disc 6 is fixed on one end of the lifting device 5 extending to the center position of the top of the base 2. Four pressing components 7 are arranged in a circular array on the outside of the fixed disc 6. The four pressing components 7 correspond to the two limit components 1 10 and the limit component 2 11. The pressing component 7 includes a bamboo-jointed telescopic rod 701 hinged to the bottom of the fixed disc 6, a top cover 702 is fixedly provided at one end of the bamboo-jointed telescopic rod 701, a pushing block 705 is provided on one side of the top cover 702 for compressing the telescopic rod 15 downwards on the two limit components 10 and the limit component 2 11 during the descent of the fixed disc 6, a spring 6 703 is fixedly connected to the bottom of the top cover 702, and an electromagnet 704 of an external power supply is fixedly connected to the bottom of the spring 6 703 for pressing the circuit board and compressing the spring 2 during the downward movement of the fixed disc 6, and during the pressing process of the electromagnet 704 of the external power supply, the circuit board will be accurately placed in the limit position of the limit component 3 12 and the limit component 1 10 due to the guidance of the limit component 3 12, a loading platform 8 is fixedly provided on the top of one side of the frame 4, and the corresponding high points of the loading platform 8, the semicircular magnet sheet 16, the quarter magnet sheet 1103 and the L-shaped guide block 1201 are on the same horizontal plane; In the actual working process, the present invention can be used to insert the circuit board between the two arc-shaped guide blocks 1101 along the top surface of the loading platform 8 and guide it between the two limit components 11, and then extend it to the two limit components 10, and then start the lifting device 5 to press down the fixed disk 6 and the multiple pressing components 7, and use the electromagnet 704 of the external power supply on the pressing component 7 to preliminarily fix the circuit board, and then use the pushing block 705 to press down the limit component 11 and the limit component 10 as a whole, until the limit component 10 and the limit component 11 compress the telescopic rod 15 to drive the circuit board to move downward, and then start the electromagnet 704 of the external power supply to work with positive and negative alternating current to change the electrode, and use the electrode to absorb and push the semicircular magnet piece 16 on the limit component 10 and the quarter magnet piece 1103 on the limit component 11, so as to drive the circuit board to vibrate up and down, and the vibration frequency is adjustable, and the solder joint detection of the circuit board is carried out by this vibration, which is safer than traditional knocking.

[0019] like Figure 1 , Figure 4 and Figure 7As shown, the limit component three 12 includes an L-shaped guide block 1201 fixedly connected to the spring four 13, and a plurality of rotatable longitudinal electric screws 9 are arranged on the guide surface on the top side of the L-shaped guide block 1201 to guide and move the circuit board during the pressing process. A plug plate 17 is arranged at the bottom of the base 2, and a plurality of circular holes are opened on the base 2 and the plug plate 17, and an amplitude control component 18 is arranged in one of the circular holes. The amplitude control component 18 can be adjusted and inserted into one of the circular holes in the circuit board according to the setting of the plurality of circular holes. In actual application, through the setting of the roller 19, the L-shaped guide block 1201 and the limit protrusion 1202, the circuit board can be accurately placed in the four-point positioning of the limit component one 10 and the limit component two 11 by utilizing the guidance of the top of the L-shaped guide block 1201 during the pressing process of the circuit board, and the rolling friction of the roller 19 is utilized to make the guide movement smoother.

[0020] like Figure 1 , 4 , 5, 7, 8, 9 and Fig.10 As shown, the amplitude control assembly 18 includes a fixing member 187 threadedly connected to the plug plate 17, a main rod 181 is threadedly connected to the top of the fixing member 187, a fixing ring 186 is fixedly arranged on the main rod 181, a moving ring 184 is arranged on the top of the fixing ring 186 and is connected to the moving ring 184 through a spring 185, a slider 183 is arranged on the top of the moving ring 184 and is slidably connected to the main rod 181, and a limiting rod 189 that can be retracted inward is arranged on the slider 183, which is used to insert the circuit board into the circular hole of the circuit board so that the circuit board is placed between the limiting rod 189 and the moving ring 184 to limit the amplitude of the middle position of the circuit board; The slider 183 is placed on one side of the main rod 181, and a spring 7 182 is fixedly connected between the main rod 181 and the main rod 181 through the spring 7 182 to form an elastic sliding connection with the main rod 181. The inner side of the slider 183 is embedded with an electromagnet 2 188 that absorbs the limit rod 189 to shrink after power is turned on. The bottom of the electromagnet 704 of the external power supply is provided with a touch switch and is electrically connected to the electromagnet 2 188. The fixing piece 187 is threadedly connected to the plug plate 17 and the top thereof extends to the bottom of the base 2. The bottom of the main rod 181 passes through the base 2 and is threadedly connected to the fixing piece 187. Through the setting of the amplitude control component 18, the semicircular bottom plate 1102 can be moved down to the limiting protrusion 1202 to form a four-point positioning and then continue to move down. The limiting rod 189 and the slider 183 at the top of the amplitude control component 18 pass through the circular holes in the circuit board. In addition to the four corner positioning circular holes, there will be several circular holes on the circuit board for positioning and installation. This is a prior art and is not described here. After insertion, the limiting rod 189 pops out to limit the top of the circuit board. This limitation can be used to control the amplitude of the intermediate position when testing large circuit boards or some relatively thin circuit boards, so as to avoid the situation where the intermediate amplitude is too large during the up and down vibration process, causing damage to the circuit board. The invention can be applied to the detection of some special circuit boards, during which the touch switch on the electromagnet 704 of the external power supply is used. When the electromagnet 704 of the external power supply is not in contact with the top of the limit component 10 and the limit component 2 11, the limit rod 189 is closed inside the slider 183. At this time, the electromagnet 2 188 is energized and adsorbed. After the contact, the current of the electromagnet 2 188 reverses to generate a repulsive force on the limit rod 189, pushing the limit rod 189 to move outward, and then the limit rod 189 enters the round hole under the pressure of the downwardly moving circuit board. After the downward pressure component 7 moves upward as a whole, the touch switch on the electromagnet 704 of the external power supply loses contact, and the limit rod 189 is adsorbed back, which is convenient for the disassembly of the circuit board.

Claims

1. A circuit board detection mechanism, comprising a base (2), a frame (4) being arranged on the base (2), transverse electric lead screws (3) being installed on both sides of the base (2), two longitudinal electric lead screws (9) being arranged to slide between the two transverse electric lead screws (3), and two movable frames (1) being arranged to slide on the two longitudinal electric lead screws (9), respectively, wherein: A second limiting assembly (11) is arranged on the top of the two moving frames (1) located at the front side, and a first limiting assembly (10) is arranged on the top of the two moving frames (1) located at the rear side. A telescopic rod (15) is arranged between the first limiting assembly (10), the second limiting assembly (11) and the moving frames (1), and a spring (1) is sleeved on the outer side of the telescopic rod (15); A semicircular magnet sheet (16) is provided on the limiting component one (10), and the limiting component one (10) and the semicircular magnet sheet (16) are connected via a spring two; The second limiting component (11) comprises a semicircular bottom plate (1102) fixedly connected to the mobile frame (1) via a telescopic rod (15), an arc-shaped guide block (1101) being arranged on the semicircular bottom plate (1102), the arc-shaped guide blocks (1101) on the two mobile frames (1) forming an opening for introducing a circuit board, a quarter magnet sheet (1103) being arranged on one side of the top of the semicircular bottom plate (1102), and the quarter magnet sheet (1103) and the semicircular bottom plate (1102) being fixedly connected via a spring three, a third limiting component (12) being arranged on the front side of the second limiting component (11), and one end of the bottom of the third limiting component (12) being obliquely inserted into the interior of the mobile frame (1) and being slidably connected to the mobile frame (1), and a fourth spring (13) being fixedly connected to the bottom of one end of the third limiting component (12) extending into the interior of the mobile frame (1) for elastically supporting the third limiting component (12); A lifting device (5) is installed on the rear side of the frame (4); a fixed disc (6) is fixed on one end of the lifting device (5) extending to the center position of the top of the base (2); four downward pressing components (7) are arranged in a circular array on the outside of the fixed disc (6); and the four downward pressing components (7) correspond to the two limit components one (10) and the limit component two (11).

2. A circuit board detection mechanism according to claim 1, characterized in that: The pressing component (7) comprises a bamboo-jointed telescopic rod (701) hinged to the bottom of the fixed disc (6); a top cover (702) is fixedly provided at one end of the bamboo-jointed telescopic rod (701); a pushing block (705) is provided on one side of the top cover (702) for compressing the telescopic rod (15) downwards on the two limit components 1 (10) and the limit component 2 (11) during the descent of the fixed disc (6); a spring 6 (703) is fixedly connected to the bottom of the top cover (702); and an electromagnet (704) of an external power source for pressing the circuit board and compressing the spring 2 during the downward movement of the fixed disc (6) is fixedly connected to the bottom of the spring 6 (703); and during the pressing process of the electromagnet (704) of the external power source, the circuit board will be accurately placed in the limit position of the limit component 3 (12) and the limit component 1 (10) due to the guidance of the limit component 3 (12) during the pressing process.

3. A circuit board detection mechanism according to claim 1, characterized in that: The limiting assembly three (12) comprises an L-shaped guide block (1201) fixedly connected to the spring four (13), and a plurality of rotatable longitudinal electric lead screws (9) are arranged on a guide surface on one side of the top of the L-shaped guide block (1201) to promote the guide movement during the downward pressing process of the circuit board.

4. A circuit board detection mechanism according to claim 1, characterized in that: The base (2) is provided with an inserting plate (17) at the bottom thereof. The base (2) and the inserting plate (17) are provided with a plurality of circular holes, one of the circular holes being provided with an amplitude control component (18). The amplitude control component (18) can be inserted into a circular hole in the circuit board in an adjustable manner according to the arrangement of the plurality of circular holes.

5. A circuit board detection mechanism according to claim 4, characterized in that: The amplitude control component (18) comprises a fixing member (187) threadedly connected to the plug plate (17); the fixing member (187) is threadedly connected to a main rod (181) at the top; a fixing ring (186) is fixedly arranged on the main rod (181); a moving ring (184) is arranged on the top of the fixing ring (186) and is connected to the moving ring (184) via a spring (185); a slider (183) is arranged on the top of the moving ring (184) and is slidably connected to the main rod (181); and a limiting rod (189) that can be retracted inwardly is arranged on the slider (183) and is used to place the circuit board between the limiting rod (189) and the moving ring (184) after being inserted into the circular hole of the circuit board to limit the amplitude of the middle position of the circuit board.

6. A circuit board detection mechanism according to claim 5, characterized in that: The sliding block (183) is placed at the top of one side inside the main rod (181) and is fixedly connected to the main rod (181) with a spring seven (182), and forms an elastic sliding connection with the main rod (181) through the spring seven (182).

7. A circuit board detection mechanism according to claim 6, characterized in that: The inner side of the slider (183) is embedded with a second electromagnet (188) which attracts the limit rod (189) to shrink after power is supplied, and a touch switch is provided at the bottom of the electromagnet (704) of the external power supply and is electrically connected to the second electromagnet (188).

8. A circuit board detection mechanism according to claim 5, characterized in that: The fixing member (187) is threadedly connected to the insert plate (17) and the top thereof extends to the bottom of the base (2); the bottom of the main rod (181) passes through the base (2) and is threadedly connected to the fixing member (187).

9. A circuit board detection mechanism according to claim 2, characterized in that: The bamboo-jointed telescopic rod (701) is fixedly connected to the fixed disc (6) via threads and is fixed after adjusting the angle by tightening or loosening the bolts.

10. A circuit board detection mechanism according to claim 1, characterized in that: A loading platform (8) is fixedly arranged on the top of one side of the frame (4); the loading platform (8) and the height points of the semicircular magnet sheet (16), the quarter magnet sheet (1103) and the L-shaped guide block (1201) are on the same horizontal plane.

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