Abstract: A lightning strike fault monitoring system for a wind turbine generator system and a lightning protection system (110) thereof, wherein the lightning strike fault monitoring system for the wind turbine generator system includes the lightning protection system. The lightning protection system (110) comprises a main body (101) provided with a blind hole (1011), a core (102), a connecting member (103) made of gasifiable material, a first elastic member (104), a second elastic member (105), a sealing cover (106), a bottom plate (107), and a switch used for connecting between an external signal source and a detecting terminal. The core (102) and the first elastic member (104) are respectively accommodated in the blind hole (1011), and the core (102) is connected to the main body through the connecting member (103). One end of the first elastic member (104) abuts against the core (102), and the other end is connected to the bottom wall of the blind hole (1011).

Abstract: A lightning strike fault monitoring system for a wind turbine generator system and a lightning protection system (110) thereof, wherein the lightning strike fault monitoring system for the wind turbine generator system includes the lightning protection system. The lightning protection system (110) comprises a main body (101) provided with a blind hole (1011), a core (102), a connecting member (103) made of gasifiable material, a first elastic member (104), a second elastic member (105), a sealing cover (106), a bottom plate (107), and a switch used for connecting between an external signal source and a detecting terminal. The core (102) and the first elastic member (104) are respectively accommodated in the blind hole (1011), and the core (102) is connected to the main body through the connecting member (103). One end of the first elastic member (104) abuts against the core (102), and the other end is connected to the bottom wall of the blind hole (1011).

Abstract: The present disclosure relates to a graphene and Fe3O4-Au composite and a preparation method and a use thereof. The preparation method includes the following: firstly, preparing a thiol alkyl azide-modified Fe3O4-Au complex, and preparing an alkynylated graphene oxide by reacting a graphene oxide, which is activated by thionyl chloride, with a propargyl alcohol, and then performing a click reaction of the alkynyl group with the azide group between the thiol alkyl azide-modified Fe3O4-Au complex and the alkynylated graphene oxide with adding a catalysis under a nitrogen atmosphere condition to obtain the graphene and Fe3O4-Au composite. The method of preparing the graphene and Fe3O4-Au composite of the present disclosure has mild reaction conditions, and is simple and reliable.

Abstract: Provided are a high temperature and chloride corrosion resistant NiCrTiAlSi/La2O3 coating at a flue gas side of a waste incineration power generating boiler and a preparation method thereof. The method comprises the following steps: (1) preparing a composite powder; (2) uniformly grinding the composite powder to obtain a spherical composite powder, then drying the spherical composite powder; (3) cleaning and roughening a surface of a substrate; (4) using a thermal spraying technique to spray a primer layer on a heating surface; (5) using a thermal spraying technique to spray the spherical composite powder onto the primer layer; and (6) cooling. The coating obtained by the method comprises a composite coating spray-coated on a surface of the primer layer. A rare element in the form of La2O3 is added to the coating to purify a grain boundary of the coating.

Abstract: A wrench of ratchet wheel, to which a high torque force can be applied and which can be widely used, includes a grip, a ratchet wheel mechanism and a driver which successively connect one to another from above to below. The ratchet wheel mechanism includes stem, tumbler member, a first tooth, a second tooth and a tooth pin, wherein the first tooth and the second tooth are flexibly mounted on the stem, the stem is embedded in the tumbler member, the teeth on tooth pin are arranged around the external margin of tooth pin, and the tooth pin and the stem are nest-connected so as to rotate in relative to each other. The ratchet wheel mechanism further includes the third tooth and the fourth tooth, wherein the third tooth and the fourth tooth are flexibly mounted on the stem, and the first tooth, the second tooth, the third tooth and the fourth tooth are successively disposed in the circumference direction of the tooth pin.