Vacuum platform for printing machine and using method of vacuum platform

Abstract

The invention discloses a vacuum platform for a printing machine and a using method of the vacuum platform, and relate to the technical field of printing machines. The vacuum platform for the printing machine comprises a main body platform, a supporting structure and a suction cup structure, the main body platform is fixed on a lifting workbench, the supporting structure comprises supporting ejector pins, and the suction cup structure comprises a PCB suction cup, a first steel mesh suction cup and a second steel mesh suction cup. When the vacuum platform is used, a PCB is jacked up through the supporting ejector pins, so that a gap is formed between the PCB and the inner bottom surface of a tool jig, and the PCB is prevented from being influenced by deformation of the bottom surface of the tool jig; then the PCB is adsorbed through the PCB suction cup, so that the PCB is tightly attached to the supporting ejector pins, and movement of the PCB is limited; a steel mesh is adsorbed through the first steel mesh suction cup and the second steel mesh suction cup, so that the steel mesh can be tightly and seamlessly attached to the PCB, then the phenomena of tin connection, tin shortage and the like of the PCB in the printing process are avoided, and the printing quality of the PCB can be effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of printing machines, in particular to a vacuum platform for printing machines and a method for using the same. Background technique [0002] During the production and processing of PCB boards, it is necessary to place the PCB boards in special tooling fixtures for processing, and paste high-temperature-resistant tapes on the PCB boards at the four corners of the tooling fixtures to fix the PCB boards. Then it is sent to the workbench of the solder paste printing equipment by the transmission mechanism for printing. After the solder paste is printed, it goes through patch and reflow soldering, and then tear off the high temperature resistant tape attached to the four corners of the PCB board, and then put it on The PCB board is taken out of the tooling fixture to complete the processing of the PCB board, and the tooling fixture is recycled again. Such production and processing methods have the following dis...

AI Technical Summary

Problems solved by technology

[0003] 1. After the tooling fixture passes through the high-temperature furnace for many times, various deformations will occur, especially the bottom plane of the tooling fixture. Due to the frequent close contact with the high-temperature area, the bottom plane of the tooling fixture becomes undulating and uneven. , when the PCB board is placed on the tooling fixture and is transferred to the workbench of the solder paste printing equipment for printing, due to the deformation of the tooling fixture, some parts of the PCB board and the steel mesh can be in contact, and some parts are in contact with the stencil. There is a gap, which will cause a gap between the PCB board and the stencil. In the process of printing solder paste, after the solder paste flows to the corresponding position of the PCB board, the solder paste will flow to the periphery due to the existence of gaps without restrictions. Then there is the phenomenon of tin connection, or because the gap is too large, the solder paste does not flow to the corresponding position of the PCB board, so that the PCB board has a local lack of tin phenomenon, which leads to unstable printing quality of the PCB board and prone to defective products;

[0004] 2. During the printing process of the PCB board, when the PCB board and the stencil are in contact with the printing process, due to the deformation of the tooling fixture on which the PCB board is placed, the contact surface between the PCB board and the stencil is not flat, and the printing pressure Under the action of the PCB board, there may be a slight movement phenomenon, which will cause friction damage on the surface of the PCB board, and will also cause the printed position of the PCB board to shift, making the PCB board printed incorrectly and becoming a defective product

Images