Abstract: A casing assembly, an electric fan, and a floor scrubber are provided. The casing assembly includes a housing and a cover plate. The housing has an open end. The cover plate has an assembly end connected to the open end. One of the open end and the assembly end is provided with an elastic sealing part, and the other is provided with a fitting part. A first annular projection and a second annular projection are arranged between the elastic sealing part and the fitting part. The first annular projection is located on an inner side of the second annular projection, or vice versa, in the radial direction of the open end. Two ends of the first annular projection abut against the elastic sealing part and the fitting part, respectively. Two ends of the second annular projection abut against the elastic sealing part and the fitting part, respectively.

Abstract: The present disclosure discloses a multilayer annular pore nickel-cobalt-aluminum precursor and a preparation method and a positive electrode material thereof. The precursor D50 is 8 to 20 ?m. It may be seen from a section diagram that there is a plurality of layers of annular pores in a secondary spherical particle structure, and a average porosity value of the section with a single particle or a plurality of particles is 6% to 14%. A co-precipitation reaction of nickel-cobalt mixed salt solution, alkali-aluminum solution, a complexing agent, and a precipitating agent is performed, a pH value and a concentration of aluminum solution at each stage are strictly controlled, and then working procedures of solid-liquid separating, washing, drying, mixing, sieving, and demagnetizing are performed to obtain the multilayer annular pore nickel-cobalt-aluminum precursor.

Abstract: The present disclosure discloses a gradient single-crystal positive electrode material, which has a chemical formula of LiNixCoyA1-x-yO2@mLiaZbOc, wherein 0<x<1, 0<y<1, 0<x+y<1, 0<m<0.05, 0.3<a?10, 1?b<4, and 1?c<15, A is at least one of Mn, Zr, Sr, Ba, W, Ti, Al, Mg, Y, and Nb, and Z is at least one of B, Al, Co, W, Ti, Zr, and Si. The atomic ratio of the content of Co on the surface of the single-crystal positive electrode material particle to the content of Ni+Co+A on the surface is greater than 0.4 and less than 0.8, and the atomic ratio of Co at a depth 10% of the radius from the surface of the single crystal positive electrode material particle is not less than 0.3; and the single-crystal positive electrode material particle has a roundness of greater than 0.4, and is free from sharp corners.

Abstract: A pile-side lateral static load device includes a jack system, a liftable jack cart, a loading jack fixing system, and a loading system. The jack system includes a jack body. The jack system is installed on the liftable jack cart through the loading jack fixing system. The loading system is installed on the loading jack fixing system, and the loading system includes counter-pressure loading systems and counter-tension loading systems. The pile-side lateral static load device has a simple structure, is convenient to install and operate, and can complete lateral loading and in-situ tests under different pile diameters, different tonnages and different precisions, so as to facilitate a simulation test of in-situ lateral loading of a pile.

Abstract: The invention provides a cab roof of a vehicle with a movable panel. The cab is provided with a front windscreen, a rear deck or rear walls, and door frames at both sides. The door frames are connected with the front windscreen at the front side, with the rear decks or rear walls at the rear side, forming the enclosing sidewalls of the cab. The connecting cover is hinged with the enclosing sidewalls at the front end, and is provided with rear windscreen at the rear end. The entire cab roof is consisted of the connecting cover and the rear windscreen. A telescopic bellow is at the bottom of the cab roof, which connects the enclosing sidewalls at the lower portion. A raising and lowering device is at the bottom of the rear side of the cab roof. The vehicle can be used as a car where passengers can be seated in the rear seats, and as well as a sports car where the cab roof drops on the enclosing sidewalls by pressing the telescopic bellow.

Abstract: The invention provides a cab roof of a vehicle with a movable panel. The cab is provided with a front windscreen, a rear deck or rear walls, and door frames at both sides. The door frames are connected with the front windscreen at the front side, with the rear decks or rear walls at the rear side, forming the enclosing sidewalls of the cab. The connecting cover is hinged with the enclosing sidewalls at the front end, and is provided with rear windscreen at the rear end. The entire cab roof is consisted of the connecting cover and the rear windscreen. A telescopic bellow is at the bottom of the cab roof, which connects the enclosing sidewalls at the lower portion. A raising and lowering device is at the bottom of the rear side of the cab roof. The vehicle can be used as a car where passengers can be seated in the rear seats, and as well as a sports car where the cab roof drops on the enclosing sidewalls by pressing the telescopic bellow.