Automatic blanking machine for lead frame

Abstract

The invention provides an automatic blanking machine for a lead frame. The automatic blanking machine is provided with a controller, a speed sensor, a moving mechanism, a suction head support and a blanking support. The speed sensor can obtain a transmission speed signal of the conveying belt. The controller can process a conveying belt speed signal collected by the speed sensor and can control starting and stopping of the synchronous motor and the adsorption motor. The moving mechanism is provided with a fixed support, a synchronous motor, a synchronous moving support and a straight rack. The straight rack is connected to the upper portion of the synchronous moving support in a fastened mode, and the rolling gear can drive the straight rack to move forwards or backwards on the horizontal track. And the suction head bracket is provided with a suction head for adsorbing the lead frame, and is also provided with an adsorption motor for driving the suction head to rotate by 90 degrees in the forward direction and the reverse direction. And the blanking bracket can receive the lead frame released by the suction head bracket. The suction head support and the conveying belt synchronously advance and retreat, and suction and discharging are accurate.

Description

Technical Field

[0001] This application relates to a loading and unloading device for components in the microelectronics industry. Background Art

[0002] As a chip carrier for integrated circuits, a lead frame is a key structural component that realizes the electrical connection between the internal circuit leads of a chip and the external leads by means of bonding materials (gold wire, aluminum wire, copper wire), forming an electrical loop. It serves as a bridge for connecting to external wires. Most semiconductor integrated circuits require the use of lead frames, which are important basic materials in the electronic information industry.

[0003] In the electroplating production line of lead frames, the processes of loading and unloading are involved. A good loading and unloading mechanism can improve the degree of automation, reduce the amount of manual work, and make electroplating more efficient and the quality more stable.

[0004] The invention with application number 201410854614.6 discloses a lead frame processing production line, including a traveling crane, a processing tank, and a hanger for carrying lead frames; the traveling crane is provided with a hook; the hook is movably arranged, and the hook is detachably connected to the hanger; the processing tank is provided with a cavity and an opening, and through the opening, the lead frame can be put into the cavity; when the hook moves, it carries the hanger to move, and can put the hanger into the processing tank and take out the hanger from the cavity of the processing tank. This invention does not disclose the loading and unloading mechanism of the lead frame.

[0005] The invention with application number 202311154998.6 discloses an automatic unloading device for lead frames, which relates to the technical field of integrated circuit packaging and lead frame conveying and transferring. It includes a material taking unit and a temporary storage unit. The material taking unit includes a linear moving component arranged above the conveying steel belt at the unloading port of the steel strip electroplating line. A first rotating motor is arranged below one side of the linear moving component. Multiple groups of clamping plates are arranged at the lower part of one side of the first push plate. A second rotating motor is arranged below one end of the first push plate. Multiple groups of L-shaped clamping blocks matching the clamping plates are sleeved on the outer peripheral side of the rotating rod. When this invention unloads materials, it is difficult to synchronize the conveying mechanism with the picking and placing of the lead frame, and it is difficult to operate continuously. Summary of the Invention

[0006] Object of the Invention: Provide an automatic lead frame unloading machine that can keep the unloading suction head walking synchronously with the conveyor belt during material taking, and can quickly return before material placing, and cycle in this way to keep the production line running without stopping.

[0007] Technical Solution: The automatic blanking machine for the lead frame of the present invention is arranged along the conveyor belt for hanging the lead frame. It has a controller, a speed sensor, a moving mechanism, a suction head support, and a blanking support. Each lead frame has several plastic-encapsulated chips and their connecting pins arranged in parallel.

[0008] The speed sensor can be arranged on the following vertical baffle plate and can obtain the driving speed signal of the conveyor belt. The controller can process the conveyor belt speed signal transmitted by the speed sensor and can control the start and stop of the following synchronous motor and adsorption motor.

[0009] The moving mechanism has a fixed support (with a horizontal track parallel to the conveyor belt, a vertical baffle plate, and a horizontal bracket), a synchronous motor (the synchronous motor is fixed on the horizontal bracket, and the horizontal bracket is located above or on the side above the following straight rack; a rolling gear is sleeved on the rotating shaft of the synchronous motor, or is transferred through other gears), a synchronous moving support (sleeved on the horizontal track, and the synchronous moving support can move forward or backward on the horizontal track), and a straight rack.

[0010] The synchronous motor is fixed on the horizontal bracket, the straight rack is firmly connected to the upper part or on the side above the synchronous moving support, the rolling gear meshes with the straight rack, and when the synchronous motor rotates, the rolling gear can drive the straight rack (and drive the synchronous moving support) to move forward or backward on the horizontal track.

[0011] The suction head support has a negative pressure device and 2 - 4 suction heads, so as to adsorb different parts (plastic-encapsulated parts or pins) of the lead frame to ensure stable and firm adsorption; it also has an adsorption motor that drives the suction head to rotate reciprocally in the positive and negative directions by 90°.

[0012] The blanking support can receive the lead frame released by the suction head support and stack them one by one in a carrier frame that can be lifted.

[0013] The vertical baffle plate is fixed, and there is a touch switch on the vertical baffle plate that can sense the touch when the synchronous moving support returns. When the synchronous moving support touches the vertical baffle plate instantaneously during its backward movement, the synchronous moving support stops moving.

[0014] Since there is a delay in the speed of the driving rack when the synchronous motor starts, there is a slight error from the speed of the conveyor belt; an electromagnet is preset in the synchronous moving support, and the controller controls the on-off of the electromagnet circuit. By relying on the magnetism after the electromagnet is energized, the suction head support is driven to adsorb to the steel (such as 201 or 202 stainless steel material) conveyor belt, making it completely synchronous with the conveyor belt. There is an adjustable gap between the synchronous moving support and the conveyor belt, and they can approach each other during magnetic adsorption and can naturally separate or bounce off when the magnetism is lost (for example, an elastic spring piece is arranged between them, and the bouncing force is less than the magnetic suction force).

[0015] While adsorbing, the controller controls the synchronous motor to pause, ensuring that the synchronous moving bracket is completely synchronized with the conveyor belt, and relying on the operating power of the conveyor belt to drive the synchronous moving bracket and the suction head bracket to move forward synchronously.

[0016] Then, the controller controls the electromagnet to lose power and no longer has the magnetic adsorption ability. The synchronous moving bracket drives the suction head bracket to separate from the conveyor belt. The synchronous motor rotates in the reverse direction again, driving the synchronous moving bracket and the suction head bracket to move backward in the reverse direction on the rack. Until the touch switch is activated after the synchronous moving bracket touches the vertical baffle, the adsorption motor is controlled to start through the controller, driving the suction head bracket to rotate downward by 90° for blanking.

[0017] The synchronous motor remains stationary at the horizontal bracket position, the vertical baffle remains stationary, the blanking bracket remains stationary, and the horizontal track remains stationary. The conveyor belt suspends pieces of lead frames and continues to rotate or translate to one side.

[0018] The straight rack moves forward (in the same direction as the conveyor belt) or backward synchronously with the synchronous moving bracket, the adsorption motor, and the suction head bracket (including the suction head) on the horizontal track.

[0019] The adsorption motor can also drive the suction head bracket (with the suction head) to rotate inward or downward.

[0020] All the above components can work together to sequentially achieve the following motion process: (1) The controller controls the start and stop of the following two motors.

[0021] First, the synchronous motor drives the straight rack, driving the synchronous moving bracket and simultaneously driving the suction head bracket to move forward following the conveyor belt. The forward speed is determined by the rotational speed of the synchronous motor; (2) When synchronized with the forward speed of the conveyor belt, the adsorption motor drives the suction head bracket to rotate towards the inside, and the suction head extends to suck (relying on the vacuum suction device to suck air for adsorption) the lead frame suspended on the conveyor belt; (3) Then, the suction head that has sucked the lead frame retracts and returns to its position, and the synchronous motor gradually stops. The synchronous moving bracket drives the suction head bracket to be out of sync with the conveyor belt; until it stops; (4) Then, the synchronous motor rotates in the reverse direction, driving the rack and the synchronous moving bracket to move backward. The synchronous moving bracket stops after touching the vertical baffle (the vertical baffle is equipped with a touch switch, which is linked with the synchronous motor), and the synchronous motor stops instantly at the moment of touching; (5) Next, the adsorption motor drives the suction head to rotate downward by 90°, and the suction head extends to release the lead frame, which falls into the blanking bracket; (6) Finally, the suction head returns to its position, the adsorption motor drives the suction head to rotate inward by 90°, and the synchronous motor drives the straight rack again. The synchronous moving bracket drives the suction head bracket to move forward following the conveyor belt; (7) Repeat this process in a cycle.

[0022] Advantageous effects: The present invention can achieve automatic blanking of lead frames with high blanking efficiency.

[0023] Moreover, the controller can automatically control the synchronous moving bracket to drive the suction head bracket forward or backward. Through the energization and suction of the built-in electromagnet and the power-off separation, it can move forward completely synchronously with the conveyor belt. The adsorption is synchronous and the blanking is accurate.

[0024] It automatically loses power and disengages before moving backward, and touches the switch after moving backward in place, causing the controller to control the adsorption motor to start. The whole process is continuously and seamlessly connected, and basically no manual operation is required. Description of the drawings

[0025] Figure 1 is a three-dimensional structural schematic diagram of one direction of the present invention; Figure 2 is a three-dimensional structural schematic diagram of another direction of the present invention; Figure 3 is Figure 2 a three-dimensional structural schematic diagram of another state.

[0026] In the figure, 1 - controller; 2 - speed sensor; fixed bracket (3 - horizontal track; 4 - vertical baffle; 5 - horizontal bracket); 6 - synchronous motor (7 - rolling gear; 8 - other gears); 9 - synchronous moving bracket; 10 - straight rack; 11 - suction head bracket; 12 - suction head; 13 - blanking bracket; 14 - adsorption motor; 15 - lead frame; 16 - conveyor belt; 20 - touch switch. Detailed implementation manners

[0027] Embodiment 1: Such as Figure 1 、 3 shown lead frame automatic blanking machine, set at a certain place on the conveyor belt 16 for hanging the lead frame 15, having a controller 1, a speed sensor 2, a moving mechanism, and a suction head bracket 11; the suction head bracket 11 has a negative pressure device and 3 suction heads 12.

[0028] The speed sensor 2 can obtain the driving speed signal of the conveyor belt 16, and the controller 1 can process the speed signal collected and transmitted by the speed sensor 2, and can control the start and stop of the following synchronous motor 6 and adsorption motor 14 according to this signal.

[0029] The moving mechanism comprises a synchronous moving bracket 9, a synchronous motor 6, and a straight rack 10; the synchronous moving bracket 9 is sleeved on a fixed horizontal track 3 parallel to the conveyor belt 16. A rolling gear 7 is sleeved on the rotating shaft of the synchronous motor 6, and the rolling gear 7 and the straight rack 10 are meshed with each other. The straight rack 10 is fixedly connected to the synchronous moving bracket 9. The rotation of the synchronous motor 6 can drive the synchronous moving bracket 9 to move forward or backward on the horizontal track 3.

[0030] The suction head bracket 11 also has a suction motor 14 that drives the suction head 12 to rotate 90 degrees in the forward and reverse directions respectively.

[0031] Embodiment 2: like Figure 2 , 3 As shown, in the lead frame automatic unloading machine in the first embodiment, the speed sensor 2 is arranged on the vertical baffle 4, and the vertical baffle 4 has a hole for the conveyor belt 16 to pass through. The speed sensor 2 is aligned with the conveyor belt 16 and can collect its transmission speed signal.

[0032] The synchronous movable bracket 9 may be pre-installed with an electromagnet, and the controller 1 controls the on and off of the electromagnet circuit, and relies on the magnetism of the electromagnet after being energized to drive the suction head bracket 11 to be adsorbed onto the steel conveyor belt 16, so that it is completely synchronized with the conveyor belt 16; after the electromagnet loses power, it no longer has the magnetic adsorption ability, and the synchronous movable bracket 9 drives the suction head bracket 11 to separate from the conveyor belt 16.

[0033] The vertical baffle 4 is provided with a touch switch 20, which can sense the touch when the synchronous moving bracket 9 retreats. At the moment of touch, the synchronous moving bracket 9 stops moving; then, the controller 1 controls the adsorption motor 14 to start, driving the suction head bracket 11 to rotate downward 90° to drop the material.

[0034] Then, the adsorption motor 14 drives the suction head 12 to rotate inwardly by 90°, and the suction head bracket 11 and the conveyor belt 16 move synchronously again.

Claims

1. An automatic lead frame unloading machine, arranged along a conveyor belt (16) for hanging lead frames (15), comprising a controller (1), a speed sensor (2), a moving mechanism, a suction head bracket (11), and an unloading bracket (13); the suction head bracket (11) having a negative pressure device and a suction head (12); the unloading bracket (13) being capable of receiving the lead frame (15) released by the suction head bracket (11); characterized in that: The speed sensor (2) is capable of obtaining a transmission speed signal of the conveyor belt (16), and the controller (1) is capable of processing the speed signal transmitted by the speed sensor (2) and controlling the start and stop of the synchronous motor (6) and the adsorption motor (14); The moving mechanism comprises a synchronous moving bracket (9), a synchronous motor (6), and a straight rack (10); the synchronous moving bracket (9) is sleeved on a fixed horizontal track (3) parallel to the conveyor belt (16), and the synchronous motor (6) is fixed on the electrode bracket; a rolling gear (7) is sleeved on the rotating shaft of the synchronous motor (6), the rolling gear (7) and the straight rack (10) are meshed with each other, and the straight rack (10) and the synchronous moving bracket (9) are fixedly connected together, and the rotation of the synchronous motor (6) can drive the straight rack (10) and the synchronous moving bracket (9) to move forward or backward on the horizontal track (3).

2. The automatic lead frame blanking machine according to claim 1, characterized in that: The suction head bracket (11) further comprises an adsorption motor (14) for driving the suction head (12) to reciprocate 90° in forward and reverse directions.

3. The automatic lead frame blanking machine according to claim 1, characterized in that: The speed sensor (2) is arranged on a vertical baffle (4), and a hole is provided on the vertical baffle (4) for the conveyor belt (16) to pass through. The speed sensor (2) is aligned with the conveyor belt (16) and is capable of collecting its transmission speed signal.

4. The automatic lead frame blanking machine according to claim 1, characterized in that: The vertical baffle (4) is provided with a touch switch (20) which can sense the touch of the synchronous movable bracket (9) when it moves backward. At the moment of the touch, the synchronous movable bracket (9) stops moving; then, the controller (1) controls the adsorption motor (14) to start, driving the suction head bracket (11) to rotate downward 90 degrees to drop the material.

5. The automatic lead frame blanking machine according to claim 1, characterized in that: The synchronous movable bracket (9) is pre-installed with an electromagnet, and the controller (1) controls the on and off of the electromagnet circuit, and relies on the magnetism of the electromagnet after being energized to drive the suction head bracket (11) to be adsorbed onto the steel conveyor belt (16), so that it is completely synchronized with the conveyor belt (16); after the electromagnet loses power, it no longer has the magnetic adsorption ability, and the synchronous movable bracket (9) drives the suction head bracket (11) to separate from the conveyor belt (16).

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