Stepless adjustment of pump truck delivery capacity of small-scale concrete mixer: stepless adjustment of pumping speed is realized, and discharge gate of hopper is installed? Small pump truck price can be in accordance with the specific situation of construction, 33m series concrete mixing machine! It can change the pumping displacement and satisfy different working conditions.
Maintenance methods: 1. The maintenance method of small-scale concrete mixer should follow the corresponding requirements and methods in the product specification, and check the relevant items of pump truck before and after use. Direct hanging water method 1) check the friction damage condition between the incision ring and the eye plate, which is the key to the success or failure of the direct hanging water method. If the friction damage between the incision ring and the eye plate is not severe, and the time period of the incision ring and eye plate is less than 0.1 mm, and there is no groove scratch beyond 1 mm between them, the direct water lifting method can be used.
2) After pumping concrete, pump 0. 15～0。 The water cement ratio of 25m3 is 1 ∶ 1. 5 or 1:2 mortar, and then fill the distribution valve with water, start pumping, and pump the concrete to the pouring position until clear water flows out of the delivery pipe. If the pipeline is short and the cleaning effect is good, the cleaning process is over.
3) Close the discharge door of the upper hopper and add water to the hopper. When the water is added to the height of 2 / 3 of the diameter of the concrete cylinder, the head of the column is loaded into the concrete cylinder in the direction of the distribution valve, and the cylinder is butted with a wooden sled bar about 1m long and 30mm in diameter, and water is added to the center line of the mixing shaft. Remove the crowbar, start pumping quickly, and continue to add water until the cylinder is pumped out of the delivery tube. The advantages of the piston method are that the pipeline cleaning is relatively clean, the water flow rate can be low, can be suspended, and the cost of removing the outlet and elbow is reduced.
4) The price of the concrete mixing machine is closed in the pumping volume under the low-pressure pumping state, and the rubber tube price of the concrete mixing machine is not enough to meet the conditions mentioned above in the practical construction. It depends on the following elements. (1) Constant efficiency point of pumping system: at present, the pumping arrangement of concrete pump made by domestic and foreign enterprises adopts constant power grade system.
When the pumping pressure is high, the pumping volume is low; when the pumping pressure is low, the pumping volume increases to the power level, which is conducive to the reasonable matching of power and main oil pump. From the pumping performance curve, it can be seen that the basic constant power rating curve is about MPa.
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