Safety double solenoid valve

Abstract

The invention relates to a safety duplex electromagnetic valve. The safety duplex electromagnetic valve comprises a main valve assembly composed of two sets of two-position three-way electromagnetic valves. Pilot electromagnetic valves are arranged at the upper portion of the main valve assembly through a pilot valve seat. The main valve assembly comprises a main valve body. The main valve body is provided with an air inlet, an air outlet and an exhaust port. A valve cavity is formed in the main valve body. A main valve element is arranged in the valve cavity. An upper sealing plug and a lower sealing plug are arranged on the main valve element. A reset spring is connected between the lower sealing plug and the main valve body. The safety duplex electromagnetic valve is characterized in that a first air containing cavity and a second air containing cavity are formed in the pilot valve seat, the first air containing cavity in one side communicates with an air inlet chamber of the two-position three-way electromagnetic valve on the other side, the second air containing cavity in the other side communicates with an air inlet chamber of the two-position three-way electromagnetic valve on one side, and the first air containing cavity and the second air containing cavity communicate with pilot air inlets of the corresponding pilot electromagnetic valves. By means of the safety duplex electromagnetic valve, the situation that the path communication phenomenon generated at the opening and closing moment of a main valve interferes with a pilot control air source can be avoided, and the phenomenon of mistaken fault signal reporting and unsafe faults are eliminated.

Description

technical field [0001] The invention relates to a safety double solenoid valve, in particular to a safety double solenoid valve controlled by clutches and brakes of a mechanical press suitable for manual feeding. Background technique [0002] The safety double solenoid valve for mechanical press is a safe pneumatic functional component to control the normal operation of the brake and clutch of the friction press. With the implementation and implementation of the national standard GB27607-2011 "Safety Technical Requirements for Mechanical Presses", the safety performance level of manually operated mechanical presses should reach EN ISO 13849-1:2008 / AC:2009, GB / T 16855.13 (PL e, Cat 4) standard. [0003] In the prior art, the safety double valve disclosed in Chinese patent ZL201310454582.6 includes a main valve assembly and a rear valve seat assembly. The main valve assembly includes two sets of two-position three-way solenoid valves, each set of two-position three-way soleno...

AI Technical Summary

Problems solved by technology

However, after years of use, there are also some defects and unsatisfactory places. The main reason is that the safety double valve sets the pilot air chamber on the rear valve seat. The inlet valve of the main valve is very close to each other. Although there is a constant throttle orifice blocking the throttling effect of the constant orifice orifice, the throttling effect of the constant orifice is reduced. The air source is greatly disturbed

In addition, the aerodynamic damping from the two pilot air inlets of the safety double valve to the first pilot air volume chamber and the second pilot air volume chamber is greater than that from the first pilot air volume chamber and the second pilot air volume chamber to the intake valve port The damping of the safety double valve makes the two main valve spools move relatively slowly after the safety double valve is energized, and unsafe faults often occur after energization, and the dispersion of the action time is relatively large. Because the two pilot cross-measurement and control are too sensitive, the safety The asynchronous reversing performance of the double valve is very poor, and the fault signal is often falsely reported. Therefore, this type of safety double valve is safe, but the action is not reliable.

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