[Introduction] mine uses a magnetic switch, also known mine hoist cage position switch, suggests that it is used to locate the position of the cage. General applications, used in conjunction with a permanent magnet. With a fixed position of the magnet mounted on the cage, magnetic switch installed in the lift cage on the wall during the test location, the procedure cage lift operation, to reach the test position, the magnetic switch is mounted on the wall that position, will be able to with magnet cage induction action on the transmission of information to the operator via the signal line, the cage will be set according to the system, change speed. This switching element capable of facilitating the operator to control the speed of the hoist cage lift, both to improve work efficiency, but also to enhance the effective prevention of transportation accidents, mine hoist is an integral component. [Works] I produced mine explosion-proof magnetic switch, a non-mechanical contact magnetic switch. The new chip by the GMR sensor and signal conditioning circuit and an output switching circuit. When the magnetic sample into the giant magnetoresistive sensor sensing area, electromagnetic coupling, switching operation, the output switching signal. Position output signal reflects the specimen, the direction of movement, as a travel system control signals. As in the giant magnetoresistive sensor outside S-pole magnetic field, switching delay display two seconds (the time can be customized according to customer requirements). When static role in the transition state switch, loses a magnetic field, the switch will automatically reset. And general mechanical momentary action pushbutton switch is different, magnetic switch without pressing, according to the magnetic field sensing automatic operation. The company's mine explosion-proof magnetic switch using sensitive and reliable GMR sensors and microelectronics devices with high resolution, high sensitivity and broad magnetic response frequency. Circuit design using a redundant structure and high anti-jamming technology, using a wide voltage input switching power supply voltage of 50 ~ 60HZ AC85 ~ 265V. Magnetic switch due to a combination uses a series of advanced technology and design technology, thus achieved a high technical and performance indicators for the various mines. Use TCK magnetic switch used in the single rope and Multi Rope Hoist machine in two ways: permanent magnet magnetic field source method source method and rope. The two uses can be directly detected actual position in which the lifting vessel. You can use both methods, the implementation of double protection. With electrical control equipment, can guarantee safe and accurate operation of the hoist. [Performance Parameters wide voltage power supply: AC85--265V 50-60Hz (international universal voltage) Contact parameters: 5A 250VAC magnetic induction: 10GS (geomagnetic field intensity 0.5GS) Working Power: 30mW sensing distance: 250mm ± 2mm ( In TS250 type permanent magnet, for example) output contacts: two normally open, normally closed contact load voltage: 750V maximum load current: 5A maximum speed response: meet 30M / s speed requirements. Working times: mechanical life of up to 90,000 internal contact times. [Material] shell structure Selection: based on experimental data, cuboid minimum burst pressure under the same conditions, taking into account security and special explosion-proof underground work requirements, so the selection of the box housing. Housing material: shell material is divided according to the copper shell, stainless steel shell, aluminum. With brass shell cases, the most widely used, because copper is a common metal material in diamagnetic strongest. Internal structure: GMR chip mounted on the switch face, all of the elements by the military grade epoxy potting cured switch shell, moisture, dust, corrosion, shock. Housing leads to an eight-core cable. One side of the switch housing plate, the other side is equipped with two LEDs indicate the operating conditions, the switching operation on.