The hydraulic power device of the water pump in the hot water weeding machine which only uses the rotation speed of the water pump to adjust its temperature, and the general weeding machine installed on the agricultural vehicle, The utility model is characterized in that: - the hydraulic connection (a) on the hydraulic system of the support,Through the hydraulic hose (b), the hose passes through the "PWM" pilot proportional hydraulic valve (c), which is used to change the oil flow into the hydraulic power unit (d), the mechanical coupling (E) between the hydraulic motor (d) and the water pump (f),Realize the purpose of oil flow regulating speed;Since the three components (E, D and F) are connected, the oil flow into the engine (d) is connected to the water flow (I) from the pump (f),This indicates that changing the water flow rate (I) will involve regulating the oil flow rate - a derivative integrated proportional regulator (g), which drives the proportional hydraulic valve (c) through an integrated control device (H) mounted on the valve.
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