Shi Weiying concrete pump truck motor premature damage causes and solutions (with photos)

SCHWING (KVM34X) concrete pump truck made by Schweitzer of Germany has the advantages of large conveying pressure and stable flow, and is a good equipment for pumping concrete in building construction. However, due to premature damage to the pump motor (two broken in two years), this has a direct impact on normal construction and results in a significant waste of hydraulic oil. Therefore, through the analysis of the connection between the stirring motor and the stirring shaft of the vehicle, the connection between the two is improved, and the practical effect is better, which basically solves the problem of premature damage to the stirring motor. The car mixing motor and stirring shaft connection shown in Figure 1. (1) Stirring motor causes premature damage Stirring motor at work, the mortar along the surface of the stirring shaft seepage into the shaft of the stirring motor, causing stirring motor seal parts damage, the stirring motor hydraulic oil leaks, the motor Does not work properly. The reasons are: work, the mixing motor and the stirring shaft for rotational movement, the mixing shaft 1 and the seal 8 and the sleeve 6 there is a gap between the mortar along the surface of the shaft infiltration Stir motor shaft end 5; mixing work The vanes push the concrete to form an axial cyclic flow of the flow, generating axial pressure and accelerating the infiltration of the mortar. The seal 8 is sealed by means of elasticity due to its own aging and being affected by the concrete and alkaline, as well as the concrete The loss of sealing performance causes the mortar to easily penetrate into the shaft end of the motor. Once the infiltration occurs, the mortar acts as an abrasive to aggravate the wear of the seal and create a vicious cycle. (2) solution In view of the above analysis, to fundamentally solve the problem of premature damage to the stirring motor, stirring shaft should be resolved from the start of the connection with the stirring motor, for which we made the following improvements (see Figure 2): Additional flange 5 and short shaft 8, the stirring motor as much as possible out of contact with the mortar; additional flange 5 set again on the sealing felt 6, the mortar is difficult to penetrate the stirring motor; in the new method A drain hole is provided just below the blue plate so that the infiltrated mortar does not coagulate on the newly added flange. Proved to be used to improve the effect of better, to avoid the damage to the stirring motor seals, stirring motor to improve the service life, and to avoid a lot of hydraulic oil waste.