An electric jack comprises a jack body, and an ejector rod is arranged in the jack body. The plunger pump assembly is arranged on one side of the jack body and comprises a connecting base, a pump body, a plunger pump core and a pump body spring; the device is characterized by further comprising a fixing frame installed on the connecting base; the driving mechanism is installed on the upper portion of the fixing frame and provided with an output shaft, a driving motor and a reduction gearbox, and the driving motor is connected with the battery pack; the impeller is arranged in the inner cavity of the fixing frame and connected to the output shaft, the impeller is located above the plunger pump core and provided with a corrugated part, and the corrugated part is provided with a wave crest section and a wave trough section; and the movable rod mechanism is arranged in the inner cavity of the fixing frame and comprises a movable rod piece and guide blocks, the movable rod piece is arranged between the two guide blocks, is positioned between the impeller and the limiting plate of the plunger pump core and abuts against the impeller and the limiting plate of the plunger pump core, and vertical reciprocating motion of the plunger pump core is achieved through the height difference between the wave crest section and the wave trough section and the elastic force of a pump body spring. The structure is simple, the strength is high, the service life is long, the size is small, and the operation stability and safety are improved.

一种电动千斤顶，包括千斤顶本体，内设顶杆；柱塞泵组件，设在千斤顶本体的一侧，包括连接底座、泵体、柱塞泵芯与泵体弹簧；特点：还包括固定架，安装在连接底座上；驱动机构，安装在固定架的上部，具有输出轴、驱动电机与减速箱，驱动电机连接电池包；波轮，设在固定架的内腔中并连接在输出轴上，波轮位于柱塞泵芯的上方位置处且具有波纹部，波纹部上设波峰段与波谷段；动杆机构，设在固定架内腔内且包括动杆件、导向块，动杆件设在两导向块之间同时还定位设在波轮与柱塞泵芯的限位板之间且相互抵接，利用波峰段与波谷段之间的高度差及泵体弹簧的弹力实现柱塞泵芯的上下往复运动。结构简单、强度高、寿命长，体积小，提升运行稳定性和安全性。