Abstract: A waterproof lamp head, including: a lamp core holder, a lamp holder, and a light-transmitting cover. The lamp core holder is arranged with an LED lamp board; the lamp core holder is further arranged with a lead wire, an end of the lead wire passing through the lamp core holder and being connected to the LED lamp board. The lamp holder is integrally injection molded on an outer side of the lamp core holder and on an outer side of the lead wire; the lamp holder defines a through hole for the lead wire to pass through. The light-transmitting cover is ultrasonically welded to the lamp core holder; a sealed space is defined between the light-transmitting cover and the lamp core holder to mount the LED lamp board.

Abstract: It is an object to provide an aerial work vehicle in which an engine drive unit and an electric drive unit that serve as a power source can be interchanged depending on the usage environment, where the interchanging of power source is easy, and the vehicle is balanced so that the center of gravity position of the vehicle remains unchanged before and after the interchanging. As a solution, a first mounting portion (8), on which an engine drive unit (7) and an electric drive unit (13) that serve as a power source of a hydraulic device (11) are interchangeably mounted, and a second mounting portion (10), on which a counterweight (9) and a battery (14) which provide a balancing mass are interchangeably mounted, are arranged on different sides of a raising/lowering unit (5) on a vehicle body frame (3).

Abstract: A lamp cap of a Christmas lamp includes a lamp cap housing, and a potting wick assembly arranged in the lamp cap housing. The potting wick assembly includes a patch lamp board, a lead wire connected to the patch lamp board, a transparent outer housing, and a potting adhesive. At least one LED lamp bead is arranged on the patch lamp board. A receiving cavity is arranged in the transparent outer housing, and the patch lamp board is placed at a bottom of the receiving cavity. The lead wire is led out from one end of the receiving cavity, and the potting adhesive is potted into the receiving cavity.