CN105428282A - Chip mounter with anti-overlapping function - Google Patents

Abstract

The invention discloses a placement machine with anti-stacking function, which comprises a frame accommodating box, a transmission track, a placement head and an anti-stacking frame detection mechanism. The transmission track is located at the front end of the frame containing box, and the placement head is located at the rear end of the transmission track. The anti-folding frame detection mechanism includes a fixed bracket, a movable lever, a detection roller, a sensor, a controller and an alarm. When the thickness of the lead frame conveyed on the conveying track is greater than the gap between the lower end surface of the detecting roller and the conveying track, the detecting roller is lifted up, and the movable lever rises accordingly, and the sensor detects the rising movement of the movable lever , send a signal to the controller, and the alarm is controlled by the controller to send out an alarm. The present invention can effectively detect that two or more frames are overlapped and sent to the track, so that the equipment will stop and give an alarm, reminding the staff to deal with it, thus directly improving the welding quality, reducing the loss of raw materials, and thus reducing the production cost.

Description

Mounter with anti-overlap function

technical field

The invention relates to the technical field of placement machines, in particular to a placement machine with an anti-overlapping function.

Background technique

A placement machine, also known as a placement machine or a surface mount system, is a device that fixes a chip to a lead frame. The placement machine is mainly composed of a frame housing box, a conveying track and a placement head. The lead frames are stacked and stored in a frame container. During production, the frame housing box allows the lead frames inside it to drop onto the conveying track one by one, and the lead frame is conveyed to the bottom of the placement head by the conveying track, and the chip is accurately placed on the lead frame by moving the placement head The patch part is patched. As the chip carrier of integrated circuits, the lead frame is a key structural part that realizes the electrical connection between the lead-out end of the chip's internal circuit and the outer lead by means of bonding materials (gold wire, aluminum wire, copper wire) to form an electrical circuit. When it comes to the bridge function of connecting with external wires, most semiconductor integrated blocks need to use lead frames, which are important basic materials in the electronic information industry. With the development trend of semiconductor miniaturization, the existing lead frame is getting thinner, and its thickness generally does not exceed 1mm. However, when a lead frame of this thickness falls from the frame accommodating box to the conveying track, adhesion phenomenon is very likely to occur, and two lead frames fall onto the conveying track at the same time. When two lead frames are overlapped together, the bonding between the chip and the lead frame will be unstable, resulting in unqualified products, and finally lead to lead frame and chip waste.

Contents of the invention

What the present invention aims to solve is that the lead frame overlapping phenomenon easily occurs in the existing chip mounter, which causes the problems of unqualified products and waste of raw materials, and provides a chip mounter with an anti-stacking function.

In order to solve the above problems, the present invention is achieved through the following technical solutions:

A placement machine with an anti-stacking function, including a frame storage box, a transmission track and a placement head; the transmission track is located at the front end of the frame storage box, and the placement head is located at the rear end of the transmission track; the difference is that, It further includes an anti-folding frame detection mechanism; the anti-folding frame detection mechanism includes a fixed bracket, a movable lever, a detection roller, a sensor, a controller and an alarm; wherein the fixed bracket is fixed at the edge of the transmission track; the fulcrum of the movable lever Connect with the fixed bracket, and make the movable lever vertically placed directly above the transmission track; the detection roller is installed at the lower end of the movable lever, and there is a certain gap between the lower end surface of the detection roller and the transmission track, the height of the gap It is equal to the thickness of the lead frame to be conveyed; the sensor is facing the movable lever, the output end of the sensor is connected with the input end of the controller, and the output end of the controller is connected with the alarm. When the thickness of the lead frame conveyed on the transmission track is greater than the gap between the lower end surface of the detection roller and the transmission track, the detection roller is lifted up, and the movable lever rises accordingly, and the sensor detects the upward movement of the movable lever , send a signal to the controller, and the alarm is controlled by the controller to send out an alarm.

In the above scheme, the sensor is a photoelectric sensor, and the photoelectric sensor includes a light emitter, a light receiver and a detection circuit; wherein there is a certain gap between the level of the light emitter and the level of the upper end surface of the movable lever. The height difference is smaller than the thickness of the lead frame to be conveyed; the light receiver and the light emitter are at the same level, and the output end of the light receiver is connected to the input end of the controller through the detection circuit.

In the above scheme, the controller is connected with the shutdown switch of the placement machine.

In the above solution, the alarm is an audible and visual alarm.

Compared with the prior art, the present invention installs an anti-overlapping frame detection mechanism on the existing placement machine, which can effectively detect that two or more frames are overlapped and sent to the track, so that the equipment will stop and give an alarm to remind employees to deal with it. It directly improves the welding quality and reduces the loss of raw materials, thereby reducing production costs.

Description of drawings

Fig. 1 is a structural schematic diagram of a mounter with an anti-overlapping function.

Labels in the figure: 1. Frame storage box; 2. Transmission track; 3. Mounting head; 4. Lead frame, 5. Chip; 6-1. Fixed bracket; 6-2. Movable lever; 6-3. Detection Roller; 6-4, sensor.

detailed description

A placement machine with an anti-stacking function, as shown in FIG. The transmission track 2 is located at the front end of the frame housing box 1 , and the placement head 3 is located at the rear end of the transmission track 2 . It is characterized in that it further includes an anti-folding frame detection mechanism. The anti-folding frame detection mechanism comprises a fixed bracket 6-1, a movable lever 6-2, a detection roller 6-3, a sensor 6-4, a controller and an alarm. Wherein the fixed bracket 6 - 1 is fixed on the edge of the conveying track 2 . The fulcrum of the movable lever 6-2 is connected with the fixed bracket 6-1, and the movable lever 6-2 is placed vertically directly above the transmission track 2. The detection roller 6-3 is installed on the lower end of the movable lever 6-2, and there is a certain gap between the lower end surface of the detection roller 6-3 and the transmission track 2, and the height of the gap is equal to the height of the lead frame 4 to be transmitted. thickness. The sensor 6-4 is facing the movable lever 6-2, the output end of the sensor 6-4 is connected with the input end of the controller, and the output end of the controller is connected with the alarm. When the thickness of the lead frame 4 transmitted on the transmission track 2 was greater than the gap between the lower end surface of the detection roller 6-3 and the transmission track 2, the detection roller 6-3 was lifted upwards, and the movable lever 6-2 then Rise, now sensor 6-4 detects the rising motion of movable lever 6-2, sends signal to controller, and sends the alarm by controller control alarm.

In order to be able to detect the state of the movable lever 6-2, the sensor 6-4 may be a height sensor 6-4, a displacement sensor 6-4, or other sensors 6-4 capable of detecting the lifting of the movable lever 6-2. However, considering the ease of implementation and cost, in a preferred embodiment of the present invention, the sensor 6-4 is a photoelectric sensor 6-4. The photoelectric sensor 6-4 includes a light transmitter, a light receiver and a detection circuit. There is a certain height difference between the level where the light emitter is located and the level where the upper end surface of the movable lever 6-2 is located, and the height difference is smaller than the thickness of the lead frame 4 to be transported. The light receiver and the light emitter are at the same level, and the output end of the light receiver is connected with the input end of the controller through the detection circuit. The light transmitter continuously sends out light signals: when the movable lever 6-2 is not lifted, the light signal sent by the light transmitter is not blocked, the light receiver cannot receive the reflected light signal, and the detection circuit cannot detect To the signal returned by the light receiver, so no signal is sent or a non-stacked signal is sent to the controller; when the movable lever 6-2 is in a raised state, the light signal sent by the light emitter is blocked by the movable lever 6-2 When reflection occurs, the optical receiver receives the reflected optical signal and sends it to the detection circuit. The detection circuit detects the signal returned by the optical receiver and sends a lamination signal to the controller.

The controller and alarm can be specially set controllers and alarms, or can directly use the controllers and alarms that come with the original placement machine itself. In order to be able to inform the production workers of the lamination phenomenon of the lead frame 4 in the placement machine in time, the alarm is an audible and visual alarm. But considering that the production worker may ignore the alarm signal sent by the alarm because of being busy, the controller is also connected with the stop switch of the placement machine, so that when the anti-folding frame detection mechanism detects that the lead frame 4 has laminations, the controller A signal is sent to control the stop of the placement machine, so as to avoid the occurrence of unqualified products, and the waste of the lead frame 4 and the chip 5 caused thereby.

Claims (4)

1. A placement machine with anti-stacking function, including a frame storage box (1), a transmission track (2) and a placement head (3); the transmission track (2) is located at the front end of the frame storage box (1). The mounting head (3) is located at the rear end of the transmission track (2); it is characterized in that it further includes an anti-folding frame detection mechanism; the anti-folding frame detection mechanism includes a fixed bracket (6-1), a movable lever (6-2) , detection roller (6-3), sensor (6-4), controller and alarm; wherein the fixed bracket (6-1) is fixed on the edge of the transmission track (2); the movable lever (6-2) The fulcrum is connected with the fixed bracket (6-1), and the movable lever (6-2) is vertically placed directly above the transmission track (2); the detection roller (6-3) is installed on the movable lever (6-2) The lower end of the detection roller (6-3) and the transmission track (2) leave a certain gap between the height of the gap equal to the thickness of the lead frame (4) to be transmitted; the sensor (6-4 ) is opposite to the movable lever (6-2), the output end of the sensor (6-4) is connected with the input end of the controller, and the output end of the controller is connected with the alarm; When the thickness of the lead frame (4) conveyed on the conveying track (2) is greater than the gap between the lower end face of the detecting roller (6-3) and the conveying track (2), the detecting roller (6-3) is moved upward Lift up, the movable lever (6-2) rises accordingly, at this time the sensor (6-4) detects the upward movement of the movable lever (6-2), sends a signal to the controller, and sends an alarm through the controller to control the alarm . 2. The mounter with anti-overlapping function according to claim 1, characterized in that: the sensor (6-4) is a photoelectric sensor (6-4), and the photoelectric sensor (6-4) includes a light emitter , an optical receiver and a detection circuit; wherein there is a certain height difference between the horizontal height of the optical transmitter and the horizontal height of the upper end surface of the movable lever (6-2), which is smaller than the lead frame to be conveyed ( 4) thickness; the optical receiver and the optical transmitter are at the same level, and the output end of the optical receiver is connected to the input end of the controller through the detection circuit. 3. The chip mounter with anti-overlapping function according to claim 1, characterized in that: the controller is connected to the shutdown switch of the chip mounter. 4. The chip mounter with anti-overlapping function according to claim 1, characterized in that: the alarm is an audible and visual alarm.