Abstract:Aiming at the problem of low volume efficiency of the plunger type grouting pump, two optimization schemes have been put forward. One is to shorten the movement time of the lifting valve, the other is to improve the hydraulic system. Firstly, The movement process of the valve head of the lifting valve was modeled and analyzed, and the slurry reflux quantity of the plunger type grouting pump was calculated, it was known that the slurry reflux quantity is related to the movement time of the lifting valve and the grouting pressure, the experimental comparison shows that with the shortening of the lifting valve movement time, the reverse slurry volume was reduced and the volumetric efficiency was increased. The principle of existing grouting hydraulic system has been analyzed. Sequential valves are added to the system, the reverse slurry phenomenon has been avoided and the volume efficiency has been improved by controlling the switching sequence of horizontal and vertical lifting valves.