What is the principle of wet concrete shotcrete pump spraying machine pumping?
What are the pumping principles of wet spray trucks? How does the concrete pump pump concrete? Based on long-term repeated tests and customer surveys, Saintyol DAWIN believes that there are many factors that affect the suction performance of the mixing trailer pump pumping system, which are independent and affect each other, including the angle between the conveying cylinder and the horizontal plane, and the reversing frequency of the main hydraulic cylinder. , The angle between the mixing blade and the base, and the structure of the inner cavity of the hopper.
The test conditions and test methods are as follows: (1) All tests are carried out under the condition that the basic conditions such as concrete slump and marking remain unchanged, and the construction site is the floor of the building. (2) Choose a vehicle-mounted pump for test and test. The inclination angle of the conveying cylinder (the angle between the conveying cylinder and the horizontal plane) is changed by adjusting the height of the legs at the hopper end of the on-board pump of the wet spraying trolley, and the suction performance at different angles is obtained through experiments. The test found that raising the hopper end to increase the inclination angle (positive angle) of the conveying cylinder will significantly change the suction performance, and the more the positive angle increases, the better the suction performance. By changing the displacement of the delivery cylinder, it is found that when the displacement is 70%, compared with the displacement of 100%, the improvement of the suction performance is particularly obvious by increasing the positive angle. The average suction efficiency (suction performance) reaches 93.2 at a large angle of 6.3° %, while the horizontal angle is only 85.8%.
Adjust the commutation frequency of the main hydraulic cylinder, and calculate the average commutation frequency by recording the total commutation times and time of pumping 100 III concrete. The main test condition (commutation frequency) in this test is the suction performance when 21-27 times/min, because this condition is a common working condition. Change the welding angle of the stirring blade and the base of the stirring drag pump to make 150, 20, 300, 400 and 50 respectively. From the test results, it can be seen that when the installation angle of the mixing blade of the mixing trailer pump is 30°, the suction efficiency of the pumping system is high, reaching more than 92%, which is nearly higher than 80.96% when the installation angle of the mixing blade is 500. Percentage points, which greatly improves the work efficiency and economy of the entire concrete equipment.
The wet spraying trolley truck has played an important role in the construction according to the above pumping principles, and the wet spraying trolley plays an important role in the construction of new rural areas. Saintyol DAWIN is committed to the development and production of concrete equipment. After-sales service is guaranteed and worthy of your trust. According to the test results, by changing the overall connection mode of the conveying cylinder of the wet spraying trolley, the end of the hopper is raised by about 180 mm, and the angle between the conveying cylinder and the horizontal plane is controlled to be about 4°; the installation angle of the mixing blade of the mixing drag pump and the base is changed from the original Adjust the 20° to 30°, and add pressure relief holes on the blades to ensure adequate feeding.