The segregation phenomenon of the concrete placing boom has always been a problem that plagues the manufacturers of various concrete placing booms. Now, we have found a way to solve this problem. The following Jinyuan will explain in detail for you!
1 Foreign anti-segregation devices and existing problems
The German pm pump truck is equipped with a nylon anti-segregation device. The anti-separation device is mounted at the end of the hose of the pumping arm of the pump, and its end portion is tapered in shape, and several slits are formed in the longitudinal direction. The pm anti-segregation device has a certain resistance to the flow of concrete due to its tapered structure. When the pump truck II is working, the conical structure is opened by the pressure of the concrete pumping pressure, and the concrete can flow out from the flared taper. When the pump truck stops working, the nylon taper automatically shrinks and closes due to its own elastic force, thereby blocking the concrete in the descending pipeline from flowing out.
2 leaf spring double door anti-segregation device
The large drop anti-separation device suitable for the concrete placing boom should have: 1) the outlet resistance can be adjusted according to different pipe drop to balance the gravity of the concrete in the descending pipe; 2) good wear resistance; 3) even after wear The magnitude of the export resistance will not change.
According to the above three points, the so-called “chip spring double door” all-steel structure anti-separation device was developed. The outlet of the device has two discharge doors, and the opening of the discharge door is controlled by a plurality of superimposed leaf springs, and the force required to open the discharge door is adjusted by changing the number of superpositions of the leaf springs to realize different pipes. The static blocking material of the drop. Since the leaf spring is not washed by the concrete, even if the discharge door is worn, it does not affect the performance of the device. In order to improve the life of the device, wear-resistant surfacing is applied to the inner wall. In the actual test process, the anti-separation device fully meets our expected requirements, and the static blocking material can be fully realized when the pipeline drop is 16m. Whether it is static or dynamic, the entire pipeline is filled with concrete, achieving the goal of large-scale anti-segregation. In order to verify the effect of the “leaf spring double door” anti-separation device on reducing the wear of the pipe of the distributor, the same concrete ratio is used for the same machine equipped with the anti-separation device and the anti-segregation device. The working mode and the test conditions were tested for wear resistance.