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SMT high speed placement machine operation

In a sense, the placement machine technology has become an important symbol of SMT's pillar and in-depth development. The placement machine is the core and key equipment in the SMT product assembly line. The advanced level of the SMT processing placement machine fundamentally determines the two requirements of the placement process: placement accuracy and placement rate.

First, the function of the PCB drive is to send the PCB that needs the placement machine to the predetermined position, and then send it to the next process after the patch is completed. The transmission device is an ultra-thin belt conveyor system placed on the track. The belt line is usually divided into three sections A, B and C, and a PCB clamping device is arranged in the B section conveying section, and an infrared sensor is arranged in the section A and C. . More advanced machines also come with a barcode recognition device that sets the entry and exit of the PCB and records the number of PCBs.

The board must be fixed during the placement operation. This splint prevents the board from moving without obstructing the available patch area. On some devices, the splint automatically feeds a new board into the machine and feeds the board filled with components into the next process. The transmission is divided into an integral guide rail and a movable guide rail according to the type of the mounter. (1) Integral guide rails. In the placement machine of this type, the entry, patching, and feeding of the PCB are always on the rail. When the PCB is sent to the rail and advanced to the B segment, the PCB table has a retreat action and encounters the rear limit block, so the PCB stops running. At the same time, the top block with the locating pins under the PCB goes up, the pin is pushed into the process hole of the PCB, and the clamping device on the B segment clamps the PCB.

Below the PCB, there is a support platen with an array of circular holes. When the PCB enters the B segment, an appropriate number of support rods can be mounted on the platen according to the PCB structure. As the table top moves up, the support bar supports the PCB in a horizontal position, so that when the head is working, the PCB is not pressed down and the patch accuracy is affected.

If the PCB does not reserve the process hole in advance, the optical identification system can be used to confirm the position of the PCB. At this time, the positioning pin on the positioning block can be removed. When the PCB is in place, the front and rear limit blocks of the PCB and the clamping device are common. After the positioning of the PCB is completed, the accuracy of the optical positioning is generally higher than that of the mechanical positioning, but the positioning time is slightly longer.

(2) movable rails. In another type of high-speed mounter, the B-section rails are fixed relative to the A and C sections, and the A and C sections of the rails can be lifted up and down. When the PCB is sent to the A section of the guide by the printing machine, the A-section rail is at a high position and is connected to the printing machine guide rail: When the PCB runs to the B section, the A-section rail sinks to the same level as the B-section rail. The PCB is moved from section A to section B and clamped by section B. When the PCB patch is completed, it is sent to the C-section rail. The C-section rail is moved from the lower position (same level as the B section) to the same level as the equipment guide of the next process, and the PCB is sent from the C section to the next process. The guide rails of different models have different structures, and the method mainly depends on the overall structure of the placement machine.

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