Failure mode of the slider The failure of the slider in the emulsion pump generally has the following two forms: the slider holding cylinder phenomenon slider ZA1108 material itself is greatly expanded by heat, and the gap between the slider and the slide is small, which will cause the pump to slide during operation. The lubrication between the block and the slide is insufficient. The local dry friction causes the surface of the slider to adhere to the slide and the cylinder temperature rises sharply. This type of failure of the slider can be found at the beginning of the pump test and can be eliminated by increasing the fit clearance.

In actual use, the cylindrical pin hole lengthening and the slider breakage occur many times. The slider break position is as shown. This is because the pin connection slider is subjected to alternating tensile and compressive stresses at the slider hole, and the strength of the slider material is insufficient, resulting in irreversible plastic deformation, causing the cylindrical pin to be elongated into an elliptical hole, and Stress concentration occurs at a sudden change in diameter, and fatigue fracture occurs.

The mutual positional relationship between the coaxiality and the perpendicularity of each hole of the processed box cannot meet the design requirements. Secondly, considering the strength of the ZA1108 material itself, the structure of the connecting rod slider assembly is improved in the design. The slider is still made of ZA1108 material with good anti-wear performance. The slider and the connecting rod small head are connected by balls and connected by balls. The self-aligning function overcomes the influence of the machining accuracy of the pump casing on the performance of the connecting rod slider. The horizontal force transmitted to the slider by the small end of the connecting rod is absorbed by the steel mandrel in the middle of the slider. The slider itself only bears the small tensile force, the lateral pressure and the frictional force during the movement process, and improves the use of the slider. life.

Increase the fillet radius at the sudden change in the slider diameter to reduce stress concentration. The connecting rod is connected with the slider ball. When the crankshaft is not removed, the slider can be directly removed from the front end of the pump head for easy maintenance and replacement of the slider. Conclusion After the above-mentioned improvement of high-pressure and large-flow emulsified night pump connecting rod and slider assembly, 500h full load endurance test was carried out under the pressure of 31.5MPa. During the whole endurance test, no moving parts occurred, and the emulsion pump oil temperature was always Stable at 77. After the test, the connecting rod and the slider are disassembled and in normal wear condition, meeting the design and use requirements.

(Finish)

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