Testing device for printed circuit board

Abstract

The utility model discloses a printed circuit board testing device which comprises a base, a draught hood, an exhaust tube and a movable frame, the top end of the base is fixedly connected with a plurality of supporting springs, the center of the side wall of the base is fixedly connected with a fixing frame, the top ends of the supporting springs are fixedly connected with a supporting plate, and the center of the bottom of the supporting plate is fixedly connected with a vibration motor. Adjusting grooves are formed in the top ends of the supporting plates, bidirectional lead screws are rotationally connected to the inner sides of the adjusting grooves, adjusting blocks penetrate through the two sides of the surfaces of the bidirectional lead screws and are in threaded connection with the two sides of the surfaces of the bidirectional lead screws, placing blocks are fixedly connected to the top ends of the adjusting blocks, and intercepting frames are fixedly connected to the left and right sides of the top ends of the supporting plates and the edges of the sides, close to the fixing frame, of the supporting plates; a movable frame is movably connected to the edge of one side, away from the fixed frame, of the top end of the intercepting frame; according to the utility model, the draught hood is arranged to carry out air suction and air draft on the circuit board from the right upper part, so that falling components are sucked and recovered, the loss caused by splashing around is avoided, and the practicability of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit board production equipment, in particular to a test device for printed circuit boards. Background Technique

[0002] A printed circuit board is a board-shaped electronic product made by electronic printing technology. It connects electronic components together through wires, pads, etc. to achieve the electrical connection and mechanical support of each component in an electronic device. Various different electronic components are soldered on its surface. To ensure stable soldering, it is necessary to test the circuit board to avoid unstable circuit boards being put on the market.

[0003] Patent No. CN 214096533 U discloses a test device for printed circuit board production. The printed circuit board is clamped and fixed on a vibration table through a fixture, and the high-frequency vibration generated by the vibration table is transmitted to the printed circuit board. When there are components with false soldering or loose soldering on the printed circuit board, the high-frequency vibration will have a destructive effect on the solder joints of the components with false soldering or loose soldering on the printed circuit board, causing the components with poor soldering or false soldering to become desoldered during the vibration process, thereby achieving the purpose of detecting false soldering or loose soldering of the printed circuit board. And a driving mechanism and a brush mechanism are provided. The driving mechanism drives the brush mechanism to move above the printed circuit board clamped and fixed by the fixture and perform brushing, and cooperates with the vibration effect to slightly brush the components with poor soldering or false soldering to make them desoldered, further improving the detection effect of false soldering or loose soldering of the printed circuit board.

[0004] However, in use, it has the following defects:

[0005] Although the vibration method is used to test the stability of the circuit board soldering, during the vibration process, the components that are not firmly soldered on the circuit board will fall off and fly out. Since the components are small, it is more troublesome to recycle them, and they may be lost, resulting in losses and waste. Content of the Utility Model

[0006] The purpose of the utility model is to provide a test device for printed circuit boards, which solves the problem that in the background technique, during the vibration process, the components that are not firmly soldered on the circuit board will fall off and fly out. Since the components are small, it is more troublesome to recycle them, and they may be lost, resulting in losses and waste.

[0007] To achieve the above object, the utility model provides the following technical solution: A test device for a printed circuit board, comprising a base, an air extraction hood, an air extraction pipe and a movable frame, characterized in that: A plurality of support springs are fixedly connected to the top end of the base, a fixed frame is fixedly connected to the center of the side wall of the base, the top ends of the support springs are fixedly connected to a support plate, a vibration motor is fixedly connected to the center of the bottom of the support plate, an adjustment groove is opened at the top end of the support plate, a bidirectional lead screw is rotatably connected to the inner side of the adjustment groove, both sides of the surface of the bidirectional lead screw penetrate through an adjustment block and are threadedly connected to the adjustment block, the top end of the adjustment block is fixedly connected to a placement block, and intercepting frames are fixedly connected to the left and right sides of the top end of the support plate and the edge near one side of the fixed frame, and a movable frame is movably connected to the edge of the top end of the intercepting frame far away from the fixed frame; The air extraction hood is located directly above the support plate, and both ends of the air extraction pipe are communicated with the air extraction hood and an air suction device respectively.

[0008] In this technical solution, before vibration, the air extraction hood descends to cover the circuit board, and then the air suction device performs air extraction treatment on the surface of the circuit board through the air extraction pipe and the air extraction hood. If any components fall off, they will be absorbed into the air suction device and collected, thus avoiding the loss of components and improving the recovery efficiency during the test. The inner sides of the intercepting frames and the movable frame are provided with elastic intercepting nets. When the air extraction hood performs air extraction and suction, some relatively large components may not be sucked away. Therefore, the intercepting frames and the movable frame can intercept these components. After the test is completed, open the movable frame and take out the components, which is convenient for recovery and cleaning and improves the practicability of the device.

[0009] Preferably, a slot is opened on the surface of the side of the placement block facing the center of the support plate.

[0010] Preferably, a first threaded rod is vertically rotatably connected to the inside of the fixed frame, a first threaded block penetrates through the surface of the first threaded rod and is threadedly connected to the first threaded block, the surface of the first threaded block facing the base is fixedly connected to one end of a connecting block, and the other end of the connecting block is fixedly connected to the side wall of the air extraction hood.

[0011] Preferably, one end of the bidirectional lead screw penetrates through the support plate and is fixedly connected to a crank.

[0012] Preferably, a first motor is fixedly connected to the top end of the fixed frame, and the outer end of the transmission shaft of the first motor is fixedly connected to the top end of the first threaded rod.

[0013] Preferably, two limiting plates are fixedly connected between the left and right inner side walls of the air extraction hood. A second threaded rod is rotatably connected between the left and right inner side walls of the air extraction frame between the limiting plates. The surface of the second threaded rod penetrates through a second threaded block and is fixedly connected to the surface of the second threaded block. A connecting rod is fixedly connected to the bottom of the second threaded block, and a brush plate is fixedly connected to the bottom of the connecting rod.

[0014] Preferably, a second motor is fixedly connected to the outer side wall of the air extraction hood at the horizontal position of the second threaded rod, and the outer end of the transmission shaft of the second motor is fixedly connected to one end of the second threaded rod.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] 1. By arranging an air extraction hood above the support plate in the present utility model, components can be collected. Before vibration, the air extraction hood descends to cover the circuit board, and then the air suction device performs air extraction on the surface of the circuit board through the air extraction pipe and the air extraction hood. If any components fall off, they will be absorbed into the air suction device for collection, thereby avoiding the loss of components and improving the recovery efficiency during the test.

[0017] 2. By arranging an interception frame and a movable frame at the edge of the outer side wall of the support plate in the present utility model, components can be intercepted. An elastic interception net is arranged inside the interception frame and the movable frame. When the air extraction hood performs air extraction and suction, some relatively large components may not be sucked away. Therefore, the interception frame and the movable frame can intercept these components. After the test is completed, the movable frame is opened to take out the components, which facilitates recovery and cleaning and improves the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objectives, and advantages of the present utility model will become more obvious:

[0019] Figure 1 is the overall view of the present utility model;

[0020] Figure 2 is the front sectional schematic view of the present utility model;

[0021] Figure 3 is the side sectional schematic view of the present utility model.

[0022] In the figure: 1. Base; 2. Support spring; 3. Support plate; 301. Vibration motor; 4. Adjustment groove; 5. Bi-directional lead screw; 501. Crank; 6. Adjustment block; 7. Placing block; 8. Slot; 9. Intercepting frame; 10. Movable frame; 11. Fixed frame; 12. First threaded rod; 121. First motor; 13. First threaded block; 131. Connecting block; 14. Air extraction hood; 15. Limiting plate; 16. Second threaded rod; 161. Second motor; 17. Second threaded block; 18. Connecting rod; 19. Brush plate; 20. Air extraction pipe; 21. Air suction device. Detailed implementation mode

[0023] In order to make the technical means, creative features, achieved purposes and effects of the present utility model easy to understand, the following will be further elaborated in combination with the specific implementation modes.

[0024] A test device for printed circuit boards, see Figures 1 to 3 , including a base 1, an air extraction hood 14, an air extraction pipe 20 and a movable frame 10. A plurality of support springs 2 are fixedly connected to the top end of the base 1, a fixed frame 11 is fixedly connected to the center of the side wall of the base 1, the top ends of the support springs 2 are fixedly connected to a support plate 3, a vibration motor 301 is fixedly connected to the center of the bottom of the support plate 3, an adjustment groove 4 is opened at the top end of the support plate 3, a bi-directional lead screw 5 is rotatably connected to the inside of the adjustment groove 4, both sides of the surface of the bi-directional lead screw 5 penetrate through an adjustment block 6 and are threadedly connected to the adjustment block 6, the top end of the adjustment block 6 is fixedly connected to a placing block 7, intercepting frames 9 are fixedly connected to the left and right sides of the top end of the support plate 3 and the edge near the fixed frame 11, the edge of the top end of the intercepting frame 9 far from the fixed frame 11 is movably connected to a movable frame 10. When extracting air, some relatively large components may not be sucked away. Therefore, the intercepting frame 9 and the movable frame 10 can intercept these components. After the test is completed, the movable frame 10 is opened to take out the components, which facilitates recycling and cleaning; the air extraction hood 14 is located directly above the support plate 3, both ends of the air extraction pipe 20 are communicated with the air extraction hood 14 and the air suction device 21 respectively. The air extraction hood 14 descends to cover the circuit board, and then the air suction device 21 performs air extraction on the surface of the circuit board through the air extraction pipe 20 and the air extraction hood 14. If any components fall off, they will be absorbed into the air suction device 21 and collected, thus avoiding the loss of components.

[0025] Specifically, as Figure 2 shown, a slot 8 is opened on the surface of the side of the placing block 7 facing the center of the support plate 3, and a sponge is arranged inside the slot 8, which can not only wrap and buffer both ends of the circuit board, but also increase the friction to make the circuit board more stable.

[0026] It should be noted that, as Figure 3As shown in the figure, a first threaded rod 12 is vertically rotatably connected to the inner side of the fixing frame 11. The surface of the first threaded rod 12 penetrates through a first threaded block 13 and is threadedly connected to the first threaded block 13. One side surface of the first threaded block 13 facing the base 1 is fixedly connected to one end of a connecting block 131. The other end of the connecting block 131 is fixedly connected to the side wall of the air extraction hood 14. After the first threaded rod 12 rotates, the first threaded block 13 moves up and down, thereby driving the air extraction hood 14 to move up and down, facilitating covering the circuit board.

[0027] It should be noted that, as Figure 2 shown, one end of the bidirectional lead screw 5 penetrates through the support plate 3 and is fixedly connected to the crank 501. The setting of the crank 501 makes it more labor-saving when manually rotating, and a nut is arranged on the surface of the part of the bidirectional lead screw 5 located outside the support plate 3. After the distance between the placement plates is adjusted, the nut can be twisted to squeeze the support plate 3, ensuring the stability of the bidirectional lead screw 5.

[0028] It should be noted that, as Figure 3 shown, the top of the fixing frame 11 is fixedly connected to a first motor 121. The outer end of the transmission shaft of the first motor 121 is fixedly connected to the top of the first threaded rod 12. After the first motor 121 is started, it drives the first threaded rod 12 to rotate, thereby causing the first threaded block 13 and the air extraction hood 14 to move up and down.

[0029] It should be noted that, as Figure 2 and Figure 3 shown, two limiting plates 15 are fixedly connected between the left and right inner side walls of the air extraction frame. A second threaded rod 16 is rotatably connected between the left and right inner side walls of the air extraction frame between the limiting plates 15. The surface of the second threaded rod 16 penetrates through a second threaded block 17 and is fixedly connected to the surface of the second threaded block 17. The bottom of the second threaded block 17 is fixedly connected to a connecting rod 18. The bottom of the connecting rod 18 is fixedly connected to a brush plate 19. After the second threaded rod 16 rotates, the second threaded block 17 between the two limiting plates 15 moves horizontally. The bottom surface of the brush plate 19 is provided with soft bristles, which will move along the surface of the circuit board during the movement, thereby brushing the components to test whether their soldering is stable. And since it moves up and down following the air extraction hood 14, the distance between the bristles and the circuit board can be better adjusted, thereby changing the brushing force.

[0030] It should be noted that, as Figure 2 shown, a second motor 161 is fixedly connected to the outer side wall of the air extraction hood 14 at the horizontal position of the second threaded rod 16. The outer end of the transmission shaft of the second motor 161 is fixedly connected to one end of the second threaded rod 16. After the second motor 161 is started, it will cause the second threaded rod 16 to rotate, thereby driving the brush plate 19 to move horizontally.

[0031] It should be noted that when the exhaust hood 14 covers the circuit board, its bottom does not contact the support plate 3, and the bottom of the exhaust hood 14 is lower than the tops of the interception frame 9 and the movable frame 10, so that relatively large components will not fly out from above the interception frame 9 and the movable frame 10; while the suction device 21 functions like a vacuum cleaner, which can absorb and collect small components and wait for subsequent unified recycling.

[0032] During actual use, manually operate the bidirectional lead screw 5 to rotate, driving the adjusting blocks 6 in the adjusting slots 4 to move relative to each other, thereby changing the spacing of the placing blocks 7, enabling the placing plate to clamp and restrain the circuit board from both sides. After the vibration motor 301 is started, the support plate 3 will vibrate under the action of the support springs 2, thereby vibrating the circuit board to detect whether there are components that are not soldered stably. During this process, if a component falls off, it will fly everywhere. Since the components are small and inconvenient to collect, a suction hood 14 is provided above the support plate 3 to collect the components. Before vibration, the suction hood 14 descends to cover the circuit board, and then the suction device 21 performs air extraction on the surface of the circuit board through the suction pipe 20 and the suction hood 14. If a component falls off, it will be absorbed into the suction device 21 and collected, thus avoiding the loss of components and improving the recycling efficiency during the testing process. At the same time, by providing an interception frame 9 and a movable frame 10 on the outer wall edge of the support plate 3, the components can be intercepted. The inner sides of the interception frame 9 and the movable frame 10 are provided with elastic interception nets. When the suction hood 14 performs air extraction and suction, some relatively large components may not be sucked away. Therefore, the interception frame 9 and the movable frame 10 can intercept these components. After the test is completed, open the movable frame 10 to take out the components, which facilitates recycling and cleaning and improves the practicability of the device.

[0033] In addition, the components designed in the present utility model are all common standard parts or parts known to those skilled in the art. Their structures and principles can all be known by those skilled in the art through technical manuals or obtained through conventional experimental methods. Those skilled in the art can fully implement them without further elaboration. The content protected by the present utility model does not involve improvements to the internal structure and method.

[0034] The embodiments disclosed in the present utility model are preferred embodiments, but not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present utility model based on the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present utility model, they are within the protection scope of the present utility model.

Claims

1. A test device for a printed circuit board, comprising a base (1), an air extraction hood (14), an air extraction pipe (20) and a movable frame (10), characterized in that: The top end of the base (1) is fixedly connected with a number of support springs (2). The center of the side wall of the base (1) is fixedly connected with a fixing frame (11). The top end of the support spring (2) is fixedly connected with a support plate (3). The center of the bottom of the support plate (3) is fixedly connected with a vibration motor (301). An adjustment groove (4) is formed at the top end of the support plate (3). A bidirectional lead screw (5) is rotatably connected inside the adjustment groove (4). Both sides of the surface of the bidirectional lead screw (5) penetrate through an adjustment block (6) and are threadedly connected with the adjustment block (6). The top end of the adjustment block (6) is fixedly connected with a placement block (7). Intercepting frames (9) are fixedly connected to the left and right sides of the top end of the support plate (3) and the edge of the side close to the fixing frame (11). The edge of the top end of the intercepting frame (9) far from the fixing frame (11) is movably connected with a movable frame (10); The air extraction hood (14) is located directly above the support plate (3). The two ends of the air extraction pipe (20) are respectively communicated with the air extraction hood (14) and the air suction device (21).

2. The test device for a printed circuit board according to claim 1, wherein: A slot (8) is formed on the surface of the side of the placement block (7) facing the center of the support plate (3).

3. The testing device for a printed circuit board according to claim 1, wherein: A first threaded rod (12) is vertically rotatably connected inside the fixing frame (11). The surface of the first threaded rod (12) penetrates through a first threaded block (13) and is threadedly connected with the first threaded block (13). The surface of the side of the first threaded block (13) facing the base (1) is fixedly connected with one end of a connecting block (131). The other end of the connecting block (131) is fixedly connected with the side wall of the air extraction hood (14).

4. The test device for a printed circuit board according to claim 1, characterized in that: One end of the bidirectional lead screw (5) penetrates through the support plate (3) and is fixedly connected with a crank (501).

5. The testing device for a printed circuit board according to claim 1, wherein: A first motor (121) is fixedly connected to the top end of the fixing frame (11). The outer end of the transmission shaft of the first motor (121) is fixedly connected with the top end of the first threaded rod (12).

6. The test device for a printed circuit board according to claim 1, characterized in that: Two limiting plates (15) are fixedly connected between the left and right inner side walls of the air extraction hood (14). A second threaded rod (16) is rotatably connected between the left and right inner side walls of the air extraction frame between the limiting plates (15). The surface of the second threaded rod (16) penetrates through a second threaded block (17) and is fixedly connected with the surface of the second threaded block (17). The bottom of the second threaded block (17) is fixedly connected with a connecting rod (18). The bottom of the connecting rod (18) is fixedly connected with a brush plate (19).

7. The testing device for a printed circuit board according to claim 6, characterized in that: A second motor (161) is fixedly connected to the outer side wall of the air extraction hood (14) at the horizontal position of the second threaded rod (16). The outer end of the transmission shaft of the second motor (161) is fixedly connected with one end of the second threaded rod (16).

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