Trigger device for automatic fire extinguishing system of electric discharge forming machine tool

Abstract

The invention discloses an automatic fire extinguishing system triggering device of an electric spark forming machine tool. The automatic fire extinguishing system triggering device is composed of a spring compression mechanism, an electromagnetic linkage mechanism and an auxiliary supporting mechanism, the electromagnetic linkage mechanism is installed on one outer side of the auxiliary supporting mechanism, an electromagnetic valve is used for completing the triggering operation of the whole device, the spring compression mechanism is used for completing compression and retention of a spring, and the whole spring compression mechanism is installed between an inner side fixing plate of the auxiliary supporting mechanism and an outer side fixing plate of the auxiliary supporting mechanism through an internal integrated spring guide, and the auxiliary supporting mechanism is used for installing and positioning the spring compression mechanism and the electromagnetic linkage mechanism. According to the automatic fire extinguishing system triggering device, a temperature sensor signal is adopted to control the electromagnetic triggering linkage structures and mechanical triggering linkage structures, and therefore reliable triggering of a carbon dioxide automatic fire extinguishing system is realized; the structure has the characteristics of being high in triggering strength, compact in structure, convenient to install, suitable for severe coastal humid environments, and the device can be applied to automatic fire extinguishing devices in the electric machining process and is suitable for the machining systems of electric spark forming machine tools of various types.

Description

Technical field [0001] The invention belongs to the technical field of special processing, and is specifically a trigger device for an automatic fire extinguishing system of an electric spark forming machine tool. Background technique [0002] The EDM machine tool is often accompanied by strong spark discharge in the electrical discharge machining process. At the same time, the machine tool uses a combustible working fluid (kerosene). When the workpiece surface is very close to the combustible working fluid surface, once the electrode and the workpiece Discharge, because the electric spark is exposed to the air, it is easy to ignite the working fluid under the action of oxygen. Moreover, because of the long processing time of the electric machining machine tool, a single person has to control multiple machine tools. If the measures are not taken in time, serious consequences will be caused. It is very necessary to set a reasonable automatic fire extinguishing device for EDM machi...

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Problems solved by technology

[0002] In the process of electric discharge machining, electric discharge forming machine tools are often accompanied by strong spark discharge. At the same time, the machine tool uses flammable working fluid (kerosene). Discharge, because the electric spark is exposed to the air and under the action of oxygen, it is easy to ignite the working fluid. Moreover, due to the long processing time of the electric processing machine tool, a single person has to control multiple machine tools. If measures cannot be taken in time, serious consequences will result. Therefore, It is very necessary to set up a reasonable automatic fire extinguishing device for electric discharge forming machine tools

[0003] Traditional EDM machine tool fire extinguishers mostly use difluorochlorobromomethane commonly known as 1211 fire extinguishing agent. Although it has good fire extinguishing effect, no trace left after fire extinguishing and low boiling point pressure, it seriously damages the ozone layer, and there are 1211 fire extinguishers inside The pressure is 1.3MPa, the trigger adopts electromagnet to control the Φ4mm needle-shaped iron core, and directly pierces the sealing 0.5mm thick stainless steel foil to release the fire extinguishing agent. Since the electromagnet iron core needs materials with high magnetic permeability, stainless steel cannot be used, so in In areas with high air humidity along the coast, the phenomenon that the iron core is rusted and cannot be triggered often occurs, which reduces the reliability of the system

As an excellent fire extinguishing material, carbon dioxide is easy to obtain and the cost is very low. It is widely used in manual flammable liquid fire extinguishing equipment. However, due to the high internal pressure of a carbon dioxide fire extinguisher (generally, the internal pressure of a 3Kg carbon dioxide fire extinguisher is about 20 MPa), manual triggering adopts an increased arm The method can meet the triggering requirements, but for the automatic electromagnet core, it is difficult to directly obtain enough force to trigger the carbon dioxide fire extinguisher due to the limited power

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