Механики XXI веку №15 2016

429 / 457

Эксплуатация и ремонт машин и оборудования
429
Re-equipment of the turning screw cutter for restoration of the interfaced spherical
surfaces of the hydrodistributor and block of cylinders of the axial and piston pump
Poskrebyshev V.A., Strelkov S.P., Plekhanov N.G.а, Yakovlev I.Y., Hrickov A.V.
Bratsk State university, Makarenko 40, Bratsk, Russia
а
Keywords: hydraulic gear, hydraulic pump, lathe, refusal, wear.
Refusal in system of a hydraulic actuator comes at emergence of refusals or malfunctions in a hydraulic pump.
The most frequent refusal in axial and piston pumps is wear of the interfaced spherical surfaces between the block of
cylinders and the distributor. Costs of repair and restoration of their working capacity are very considerable. For de-
crease in expenses repair work, it is necessary to introduce more widely mechanization of handworks of repair of vari-
ous elements of cars. Use of the turning screw cutter allows increasing productivity of rescue and recovery operations
at high quality of processing of surfaces of friction of the interfaced spheres. The technical offer on creation of a new
design of the blade holder having a possibility of turn of the working tool of the turning screw cutter for restoration of
spherical surfaces of the block of cylinders and the distributor is considered. Use of a platform for installation of a
blade holder or other tool is offered. The drawing of a blade holder and platform for installation is provided.
УДК 621.879.3
About decreasing of ground to machines operating surfaces adhesion
at thermal effect
Zenkov S.A.a, Balakhonov N.A.b , Kirichenko O.P., Kuharchuk S.A.
Bratsk State University, st. Makarenko 40, Bratsk, Russia
a b .
Keywords: adhesion, coefficient of efficiency, thermal effects, the working body.
The paper assesses the degree of influence of thermal effects on the shift in the freezing of the soil in the calcu-
lation of the friction force with the adhesion negative temperature to working bodies earthmoving machinery. Deter-
mined quasi one-factor dependence of the coefficients of efficiency the thermal impact of the main factors (dispersion,
pressing pressure, humidity, temperature, contact time), causing the strength of soil freezing with metal sliding surface.
An equation relating the parameters of external factors to the freezing of the soil strength during thermal exposure,
which shows that in the investigated range of the all factors contribute to an increase in adhesion and freezing in order
to increase the degree of influence of factors make up a number: D, t, W, T, P. it was found that during thermal expo-
sure is significantly affected by the pressure of the pressing.
One of the main reasons for the decline of performance of construction and road machines in the de-
velopment and transportation of wet soils and materials is to increase the adhesion and friction when digging,
unloading, handling and planning [1-9].
Adhesion is caused by intermolecular interactions and manifests itself in the form of forces freezing
at temperatures below freezing, and a force of adhesion at a positive temperature.
Recently, the issue of combating adhesion and freezing of the soil to working bodies earthmover
paid great attention both in Russia and abroad [3-5].
The rate of freezing is influenced by many factors: soil humidity, ambient temperature, soil surface,
with which the freezing together; time of freezing; material and surface condition of the working body of the
machine; the volume of wet soil, its temperature.
One of the most effective ways to reduce the adhesion is considered to be at a negative temperature
heat [10-17].
Evaluating the effectiveness of the excavator bucket on a thermal action to reduce the adhesion of
soil with a negative temperature coefficient was determined by the effectiveness of the formula:
. . .
.
. .
б в в
Э Ф
б в
K  


 , where: . . б в  - shear stress of soil without external influence; . в  - shear stress
under external influence.