The hydraulic clamp consists of an oil tank, a power mechanism, a directional control valve, a pressure relief valve, and an oil pumping mechanism. The oil pumping mechanism comprises an oil pump body, high- and low-pressure oil outlets, an eccentric shaft, an eccentric bearing, a driven gear, a pair of high-pressure oil pumps, and a single low-pressure oil pump.
The oil pump body is rigidly mounted to the oil tank cover; the high- and low-pressure oil outlets are formed within the pump body and connected to the oil circuit of the pressure relief valve. The eccentric shaft is oriented vertically, with its upper end pivotally seated in the center of the pump body and its lower end fitted with the eccentric bearing. The driven gear is fixed to the top of the eccentric shaft, establishing a connection with the power mechanism. The high- and low-pressure oil pumps are mounted to the pump body, each featuring an actuating element that contacts the eccentric bearing; the pumping chambers of the high- and low-pressure pumps communicate respectively with the corresponding high- and low-pressure oil outlets.
By establishing a vertical connection between the oil pumping mechanism and the power mechanism, the design maximizes space utilization while minimizing the overall footprint, thereby facilitating both operational use and transportation. Furthermore, by adopting an eccentric-bearing-driven actuation method for the high- and low-pressure pumps, the mechanism offers the advantages of a simple structure, a reduced number of components, and ease of assembly.
