Upper control system
The operation of the speed control lever of the mixing drum of the small concrete mixer shall be light and flexible, and a locking device (or positioning device) shall be set. A handle position indicator shall be installed at the visible place near the handle to indicate the direction of the handle during feeding, stirring and discharging.
The hydraulic pipeline shall be arranged neatly, firmly and reasonably, and each element shall be installed and disassembled conveniently for maintenance. The solid pollution limit of hydraulic oil of hydraulic system shall comply with the provisions of QC / t29104. During the operation of small concrete mixer, the temperature rise of hydraulic oil in hydraulic system shall not exceed 40 ℃, and the higher temperature shall not exceed 80 ℃.
Water supply system
The capacity of water in the water tank for mixing drum cleaning shall not be less than 600L, and the water flow shall not be less than 45L / min. The pressure water tank must be equipped with a pressure reducing valve to ensure that the pressure in the water tank is not greater than 0.6MPa. Clear water level gauge (pipe) shall be set in the water tank of small concrete mixer truck, and the operator can easily see the water level in the water tank.
The lighting and signal devices of transport vehicles shall comply with the provisions of gb4785. A working tail light shall be set near the feed hopper. The voltage and current rating of the diesel engine starting circuit installed on the transport vehicle powered by a separate diesel engine shall comply with the relevant provisions of the diesel engine. The mean time between failures (TB) of special equipment for small concrete mixer shall not be less than 100h, and the reliability (R) shall not be less than 80%.
The mixing drum shall be provided with 1 ~ 2 inlets that can be opened quickly, with the hole diameter not less than 450mm. In the case of oval hole, its short diameter shall not be less than 350mm, and it shall be well sealed when closed. The mixing drum shall rotate stably without chattering and vibration under various specified service conditions. The mixing blade and the cylinder shall be firmly welded, and the spiral curve shall be connected. There should be no obvious inflection point.
The discharge chute shall be able to rotate 180 ° in the horizontal plane to adapt to different unloading positions, and the inclination angle with the horizontal direction shall be adjusted in the vertical plane to adapt to different unloading heights. The discharge chute shall be provided with an extended chute, which shall be easy to assemble and disassemble. The total length of the discharge chute and the extended chute shall not exceed 3.5m. After the discharge chute is connected with the extended chute, a smooth connection channel shall be formed, which shall not hinder the unloading of concrete. The discharge chute shall be provided with a locking mechanism. When the small concrete mixer is running, the discharge chute shall be fixed and locked.