SU1689499A1 - Mouldboard - Google Patents

Description

The invention relates to machines for the winter maintenance of roads and airfields, mainly of type ²

snow blowers with high swinging action. The purpose of the invention is to increase efficiency by ensuring the creation of a uniform movement of snow on the surface of the blade. The working body consists of a conical blade 1 with a cutting knife.

2. The blade 1 is made with an increase in the curvature of the frontal surface in the transverse vertical plane from its lower edge, which is associated with the cutting knife 2, towards the upper edge. The specified curvature change occurs according to the conditions of the formation of the Archimedes spiral. 2 Il.

FIG. 2

3 1689499 4

The invention relates to machines for the winter maintenance of roads and airfields, mainly of the type of high-speed plow snow plows with a swinging action. . five

The purpose of the invention is to increase efficiency by ensuring uniform movement of snow over the surface of the blade.

FIG. 1 schematically shows the working body of the snow thrower of the rejecting action 10, axonometric, general view; see

2 shows section A-A in FIG. one.

The working body of the snow thrower of the throwing action contains a blade 1 with a conical frontal surface, installed in a horizontal plane at an angle a to the direction of movement during snow development, indicated by arrow B. The blade 1 is equipped with a cutting knife 2.

The blade 1 is made with an increase in the curvature of the frontal surface in the transverse vertical plane (Fig. 2) from its lower edge, which is paired with the cutting knife 2, towards the upper edge. In this case, the radius K of the curvature of the frontal surface of the blade decreases with increasing current angle φ of the turn of the radius, and the derivative.

th / a φ <o. zo

The blade 1 in the transverse vertical plane is made, for example, in the form of a segment of the Archimedean spiral, corresponding to the expression 35

angle a to the cutting knife 2, then moves along a curved path, as shown by the dotted line in FIG. 1, along the frontal surface of the blade 1 and is ejected along the arrow G., making further flight along a ballast path.

The movement of snow on the surface of the blade

1, the curvature of which increases with distance from the cutting knife 2, provides the effect on the flow of snow Coriolis force, Since the derivative ά P / ccr <0. then the vector of Coriolis force in the vertical transverse plane coincides with the direction of movement of the snow, the plane (without taking into account friction of snow over the dump) is defined in the general form by the expression:

'p, ~ - ^{2 8} V ² . 6th

^to dR _cf. άφ '

where B is the cutting width of snow;

K is the thickness of the snow cover; y-density of snow;

V - translational speed

snow plow;

d - acceleration of gravity;

Ver - the average radius of curvature of the blade. Accordingly, for an Archimedes helix shaped blade, the value of the Coriolis force

_ in Umaks V ² a • ^p '—addr /'

Yamax - I "in -

where Yamax - the maximum radius of curvature of the blade 1, conducted from the center of curvature 0 to the place of pairing of the blade with a cutting knife 2;

Yamin - the minimum radius of curvature of the blade 1, drawn from the center of curvature 0 to the upper edge of the blade;

The advantage of the invention is that the additional effect of the Coriolis force, the direction of movement of the snow flow along the dump, directed to K, provides an increase in the distance of snow throwing at a constant speed of movement or at a constant distance of snow throwing reduces the operating speed of the machine and reduces the energy intensity of the snow cleaning process.

a - the step of the Archimedes spiral depends on the angles of inclination of the upper edge of the blade 1 and the cutting knife 2 relative to the horizontal plane;

y ^ lax is the maximum central angle of the blade between the minimum and maximum radius of its curvature.

The working body of the snowplow interacts with the snow as follows.

During the forward movement along arrow B along the snow-covered surface of the road, snow comes along arrow B below

Claims (1)

Claim The blade, installed at an angle to the direction of movement, contains a conical frontal surface with a curvature that increases in cross section from the bottom edge to the top, characterized in that, in order to increase efficiency by ensuring uniform snow movement along the surface of the blade, this section is Archimedes spiral segment. 1689499