The secondary of the transformer T has an AC voltage of about 70V, which is rectified by D1 and Cl, and then regulated by Rl and DWl to obtain a voltage of VDD=+12v. After power on, C2 charges DW2, DW3, RP3, R3, after charging to 2∕3VDD threshold level, 555 reset, Jl pulls in, J1-1 disconnects, CJl disconnects, due to the current limiting effect of C0, Power saving at no load, the primary current is only about 300mA; when soldering, the secondary voltage of T is only 30-40V, the voltage drops rapidly, causing the 555's 2 pin level to be lower than 1∕3VDD, 555 set, J1 Release, CJ1 is closed and the welder is welded at full pressure. When welding, due to the low voltage, DW2, DW3 is less than a thousand is broken, maintaining the steady state of 555. After the torch is put down, the voltage is raised to about 70V, the 555 is reset, and the CJl is disconnected and in a power-saving state.
BLPS laser safety protective device is designed for personal safety used on hydraulic bender.
The dynamic test technology it used has passed the Type 4 functional safety assessment by TUV, and get the national invention patent. The product reaches the advanced technological level of similar products.
BLPS laser safety device provides protection zone near the die tip of the bender to protect fingers and arms of the operator in close to the upper mold die tip. It is the most effective solution so far to preserves the safety and productivity of the bender.
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