Gate unit and mixer provided with same

The utility model provides a gate unit and a mixer provided with the same, wherein the gate unit consists of a gate frame and a gate opened or closed relative to the gate frame, the gate is matched with the gate frame in the manner of clearance fit, the matched contact surfaces of the gate and the gate frame are cambered, and the gate frame is made of wear-resistant material or cast steel. Since the contact surfaces of the gate and the gate frame of the gate unit are cambered, when the gate is closed, the contact surfaces can be more tightly matched, sealing is more uniform, meanwhile, the sizes of the fitting surfaces can be enlarged, so that the active area for preventing slurry leakage can be enlarged, and thereby the slurry leakage-preventing effect is notable. In addition, since the gate frame is made of wear-resistant material, the wear-resistant property of the contact surfaces can be effectively enhanced, thus preventing slurry leakage caused by the abrasion of the material of the contact surfaces due to the opening or closing of the gate. When mixing material such as concrete, the mixer adopting the gate unit can effectively avoid the problem of slurry leakage.