High-precision QFN pin detector

Abstract

The utility model relates to the technical field of QFN pin detection, in particular to a high-precision QFN pin detector, which comprises a detection frame, a high-resolution camera is embedded in the top of the detection frame, and the front end of the detection frame is fixedly connected with a display screen; the limiting mechanism is arranged at the top of the detection frame; wherein the limiting mechanism comprises a driving frame which is connected to the bottom of the detection frame in a sliding manner; according to the device, contact limiting of the two sides of the IC chip is achieved through the driving frame, the connecting frame, the movable frame and the silica gel wheel, locking of the adjusted driving frame is achieved through the spring, the clamping groove and the clamping rod, it is guaranteed that the IC chip cannot deviate in the conveying process of the IC chip on the detection frame, and compared with an existing mode that a push rod needs to be frequently pulled to lock and limit the IC chip on a containing plate, the IC chip is not prone to deviation. According to the mode, the IC chip can be limited only by adjusting the distance between the two groups of silica gel wheels at one time, and the detection convenience of the QFN pin of the IC chip is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of QFN pin detection, in particular to a high-precision QFN pin detector. Background Art

[0002] A high-precision QFN pin tester uses optical, mechanical, or electrical methods to perform high-precision inspection of the pins of QFN-packaged integrated circuits. QFN packaging is widely used in the electronics industry for its compact size and excellent thermal performance, but its leadless design makes pin inspection more challenging.

[0003] After searching, the Chinese patent "An IC Chip Pin Coplanarity Tester" authorization announcement number "CN215491528U" uses a conveyor belt, a placement plate, a push rod, a push plate and a reset spring to position the IC chip in the placement plate, ensuring that the position of the chip will not shift during the detection process, thereby improving the accuracy of the detection.

[0004] In the above application, when testing the pins of the IC chip, the push rod needs to be frequently pulled to lock or unlock the IC chip on the placement board, which makes it too inconvenient to test the QFN pins of the IC chip.

[0005] Therefore, a high-precision QFN pin detector is proposed to solve the above problems. Utility Model Content

[0006] The purpose of the present invention is to provide a high-precision QFN pin detector in order to solve the above-mentioned problem, thereby improving the problem that the push rod needs to be frequently pulled to lock or unlock the IC chip placed on the board, which makes it too inconvenient to detect the QFN pins of the IC chip.

[0007] The utility model achieves the above-mentioned purpose through the following technical solutions: a high-precision QFN pin detector, comprising: a detection frame, a high-resolution camera is embedded in the top of the detection frame, and a display screen is fixedly connected to the front end of the detection frame; a limiting mechanism, wherein the limiting mechanism is arranged on the top of the detection frame; wherein the limiting mechanism includes a driving frame slidably connected to the bottom of the detection frame, the top of the driving frame is slidably connected to two movable frames, the inner side of the movable frame is rotatably connected to silicone wheels distributed in equal rows, one side of the driving frame is fixedly connected to a connecting frame, the inner wall of the connecting frame is fixedly connected to a spring, the other end of the spring is fixedly connected to a clamping rod, the inner wall of the detection frame is provided with clamping slots distributed in equal rows, and the surface of the clamping rod is clamped to the inner wall of one of the clamping slots. Through the driving frame, connecting frame, movable frame and silicone wheels, contact and limit are achieved on both sides of the IC chip. Through the spring, slot and lever, the adjusted driving frame is locked, ensuring that the IC chip will not deviate during transportation on the detection frame. Compared with the existing method that requires frequent pulling of the push rod to lock the IC chip on the placement plate, this method only requires adjusting the distance between the two sets of silicone wheels once to limit the IC chip, thereby improving the convenience of QFN pin detection of the IC chip.

[0008] Preferably, a pull block is fixedly connected to the lower end of the surface of the clamping rod, and the surface of the pull block passes through and extends out of the inner wall of the connecting frame. The pull block is used to move the clamping rod away from the corresponding clamping slot, thereby releasing the lock on the drive frame and facilitating adjustment of the spacing between the two sets of silicone wheels.

[0009] Preferably, the surface of the pull block is fixedly connected to a mounting block, the top of which is fixedly connected to a plurality of elastic blocks, and the surface of the elastic blocks is engaged with the bottom of the connecting frame. The mounting block and the elastic blocks increase the resistance to the movement of the pull block, ensuring that the clamping rod is stably engaged in the clamping slot.

[0010] Preferably, a scale plate is fixedly connected to the top of the detection frame, and scale lines are provided on one side of the scale plate.

[0011] Preferably, an indicator block is fixedly connected to the top of the movable frame, and the upper end of the indicator block is slidably connected to the surface of the scale plate. Through the indicator block and the scale plate, the moving position of the movable frame can be observed, preventing the silicone wheel from excessively clamping the side of the IC chip.

[0012] Preferably, the bottom of the movable frame is rollingly connected to balls distributed in equal rows, and the surfaces of the balls are rollingly connected to the top of the detection frame.

[0013] Preferably, the inner side of the detection frame is fixedly connected with support rods distributed in equal rows.

[0014] The beneficial effects of the utility model are:

[0015] 1. The drive frame, connecting frame, movable frame and silicone wheels are used to achieve contact and limit on both sides of the IC chip. The adjusted drive frame is locked by springs, slots and levers, ensuring that the IC chip will not deviate during transportation on the detection frame. Compared with the existing method that requires frequent pulling of the push rod to lock the IC chip on the placement plate, this method only requires adjusting the distance between the two sets of silicone wheels once to limit the IC chip, which improves the convenience of detecting the QFN pins of the IC chip.

[0016] 2. By pulling the block, the card rod is moved away from the corresponding card slot, thereby releasing the lock on the drive frame, making it easier to adjust the spacing between the two sets of silicone wheels. By installing the block and the elastic block, the resistance to the movement of the pull block is increased, ensuring that the card rod is stably connected to the card slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a cross-sectional view of the detection frame of the present utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the limiting mechanism of the utility model;

[0020] Figure 4 for Figure 3 A magnified view of center.

[0021] In the figure: 1. Detection frame; 2. High-resolution camera; 3. Display screen; 4. Limiting mechanism; 41. Drive frame; 42. Movable frame; 43. Silicone wheel; 44. Connecting frame; 45. Slot; 46. Spring; 47. Clamping rod; 48. Pull block; 49. Mounting block; 410. Elastic block; 411. Scale plate; 412. Indicator block; 413. Ball bearing; 414. Support rod. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] When implementing: Figure 1-4As shown, a high-precision QFN pin detector includes: a detection frame 1, a high-resolution camera 2 is embedded in the top of the detection frame 1, and a display screen 3 is fixedly connected to the front end of the detection frame 1; a limiting mechanism 4, and the limiting mechanism 4 is arranged on the top of the detection frame 1; wherein, the limiting mechanism 4 includes a driving frame 41 slidably connected to the bottom of the detection frame 1, and the top of the driving frame 41 is slidably connected to two movable frames 42, and the inner side of the movable frame 42 is rotatably connected to silicone wheels 43 distributed in equal rows, one side of the driving frame 41 is fixedly connected to a connecting frame 44, the inner wall of the connecting frame 44 is fixedly connected to a spring 46, and the other end of the spring 46 is fixedly connected to a clamping rod 47, and the inner wall of the detection frame 1 is provided with clamping slots 45 distributed in equal rows, and the surface of the clamping rod 47 is clamped to the inner wall of one of the clamping slots 45.

[0024] Both sides of the inner wall of the detection frame 1 are rotatably connected to pulleys, and the surfaces of the two pulleys are transmission-connected to conveyor belts. The rear end of the detection frame 1 is fixedly connected to a servo motor, and the output shaft of the servo motor is fixedly connected to one end of one of the pulleys. Two driving holes are opened on the top of the driving frame 41, and the lower end of the surface of the movable frame 42 is slidably connected to the inner wall of the driving hole;

[0025] When the QFN pins of the IC chip need to be inspected, the connecting frame 44 is pulled. The connecting frame 44 moves and drives the driving frame 41 to move at the bottom of the inspection frame 1. The driving frame 41 moves to the appropriate position and drives the two movable frames 42 to approach each other, thereby making the two sets of silicone wheels 43 approach each other to the appropriate position. At this time, the elastic force of the spring 46 pushes the clamping rod 47 to move and engage in one of the clamping slots 45, locking the connecting frame 44 and the driving frame 41. The IC chip is placed on the conveyor belt, which is driven to slowly transmit and turn on the high-resolution camera 2 and display screen 3. The output belt in transmission slowly conveys the IC chip. The two sets of silicone wheels 43 limit the moving IC chip. The high-resolution camera 2 captures a high-definition image of the pins of the slowly moving IC chip. The image processing software on the display screen 3 pre-processes the captured image and extracts key features of the pins, such as length, position, coplanarity, etc. from the processed image. The extracted features are compared with the preset standards to determine whether the pins meet the requirements. At this time, the display screen 3 displays a detailed inspection report. It is not necessary to manually shut down the power supply of the conveyor belt drive, the high-resolution camera 2 and the display screen 3 after the test.

[0026] like Figure 4 As shown, the lower end of the surface of the clamping rod 47 is fixedly connected to a pull block 48, the surface of the pull block 48 passes through and extends out of the inner wall of the connecting frame 44, the surface of the pull block 48 is fixedly connected to a mounting block 49, and the top of the mounting block 49 is fixedly connected to several elastic blocks 410, and the surface of the elastic block 410 is clamped to the bottom of the connecting frame 44.

[0027] Under the action of the pulling block 48 and the elastic force of the spring 46, the card rod 47 is snapped into the corresponding card slot 45. The movement of the pulling block 48 drives the installation block 49 and the elastic block 410 to move, so that the elastic block 410 is snapped into the bottom of the connecting frame 44, so that the driving frame 41 and the connecting frame 44 are stably locked on the detection frame 1.

[0028] like Figure 3 As shown, a scale plate 411 is fixedly connected to the top of the detection frame 1, and scale lines are provided on one side of the scale plate 411. An indicator block 412 is fixedly connected to the top of the movable frame 42, and the upper end of the surface of the indicator block 412 is slidably connected to the surface of the scale plate 411.

[0029] like Figure 2 As shown, the bottom of the movable frame 42 is rollingly connected to balls 413 distributed in an even row. The surface of the balls 413 is rollingly connected to the top of the detection frame 1. The inner side of the detection frame 1 is fixedly connected to the inner side of the detection frame 1. The inner side of the conveyor belt contacts the surface of the support rods 414, which keeps the conveyor belt taut at all times.

[0030] When the utility model is in use, after the IC chip is placed on the scale plate 411 to measure the length, the connecting frame 44 is pulled, and the connecting frame 44 moves to drive the driving frame 41 to move. The driving frame 41 moves to the appropriate position to drive the movable frame 42, the indicator block 412 and the silicone wheel 43 to move. After observing that the indicator block 412 moves a suitable distance on the scale plate 411, the pulling of the connecting frame 44 is stopped, and the pulling block 48 and the elastic force of the spring 46 are pulled to make the clamping rod 47 clamped into the corresponding clamping groove 45. The pulling block 48 moves to drive the mounting block 49 and the elastic block 410 to move, so that the elastic block 410 is clamped to the bottom of the connecting frame 44, so that the driving frame 41 and the connecting frame 44 are stably locked on the detection frame 1, and the two sets of silicone wheels 43 flexibly contact the side of the IC chip.

[0031] It should be noted that the detection frame 1, servo motor, high-resolution camera 2 and display screen 3 in the above description are all devices with relatively mature application of existing technologies. The specific models can be selected according to actual needs. At the same time, the servo motor, high-resolution camera 2 and display screen 3 can be powered by a built-in power supply or by AC power. The specific power supply method is selected according to the situation and will not be elaborated here.

[0032] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A high-precision QFN pin detector, characterized in that: include: A detection frame (1), wherein a high-resolution camera (2) is embedded in the top of the detection frame (1), and a display screen (3) is fixedly connected to the front end of the detection frame (1); A limiting mechanism (4), wherein the limiting mechanism (4) is arranged on the top of the detection frame (1); The limiting mechanism (4) comprises a driving frame (41) slidably connected to the bottom of the detection frame (1); the top of the driving frame (41) is slidably connected to two movable frames (42); the inner side of the movable frame (42) is rotatably connected to silicone wheels (43) distributed in equal rows; one side of the driving frame (41) is fixedly connected to a connecting frame (44); the inner wall of the connecting frame (44) is fixedly connected to a spring (46); the other end of the spring (46) is fixedly connected to a clamping rod (47); the inner wall of the detection frame (1) is provided with clamping grooves (45) distributed in equal rows; the surface of the clamping rod (47) is clamped to the inner wall of one of the clamping grooves (45).

2. The high-precision QFN pin detector according to claim 1, characterized in that: The lower end of the surface of the clamping rod (47) is fixedly connected to a pull block (48), and the surface of the pull block (48) penetrates and extends out of the inner wall of the connecting frame (44).

3. The high-precision QFN pin detector according to claim 2, characterized in that: The surface of the pulling block (48) is fixedly connected to a mounting block (49), the top of the mounting block (49) is fixedly connected to a plurality of elastic blocks (410), and the surface of the elastic block (410) is clamped to the bottom of the connecting frame (44).

4. The high-precision QFN pin detector according to claim 1, characterized in that: A scale plate (411) is fixedly connected to the top of the detection frame (1), and scale lines are provided on one side of the scale plate (411).

5. The high-precision QFN pin detector according to claim 4, characterized in that: The top of the movable frame (42) is fixedly connected to an indicator block (412), and the upper end of the surface of the indicator block (412) is slidably connected to the surface of the scale plate (411).

6. The high-precision QFN pin detector according to claim 1, characterized in that: The bottom of the movable frame (42) is rollingly connected to balls (413) distributed in equal rows, and the surface of the balls (413) is rollingly connected to the top of the detection frame (1).

7. The high-precision QFN pin detector according to claim 1, characterized in that: The inner side of the detection frame (1) is fixedly connected with support rods (414) distributed in equal rows.

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