Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
  • E01H10/00—Improving gripping of ice-bound or other slippery traffic surfaces, e.g. using gritting or thawing materials ; Roadside storage of gritting or solid thawing materials; Permanently installed devices for applying gritting or thawing materials; Mobile apparatus specially adapted for treating wintry roads by applying liquid, semi-liquid or granular materials
  • E01H10/007—Mobile apparatus specially adapted for preparing or applying liquid or semi-liquid thawing material or spreading granular material on wintry roads

Definitions

• the invention relates to a spreading device for distributing granulated spreading material moistened with a liquid, which is applied centrally to a spreading disc rotating about a vertical axis, the upper side of which is provided with approximately radially extending throwing blades.
• the spreading disc used there has on its upper side radially extending throwing blades with a constant blade height, the upper edge of which is bent towards the loading side.
• the bent shovel has the task of bundling the spreading material captured by the throwing shovel before it leaves the spreading plate. While the spreading material flows through the throwing blades in the radial direction, vertical vibrations of the spreading material particles also occur as a result of the rotation impulse, so that the spreading material beam runs in a wave shape. The consequence of this is an uncontrolled spreading material discharge from the throwing vane and thus an irregular spreading pattern.
• the object of the present invention is to generate a bundle of scattering material when it emerges from the blades by means of a suitable structural design of the throwing blades, said beam spreading parallel to the level of the scattering element.
• the throwing blades each have an approximately semicircular cross-section that is open towards their loading side, that a radial inner portion of each throwing blade is designed as a mixing section with a blade height that decreases in the radial direction and that a radial outer portion of each throwing blade is designed as a calming section is formed with a substantially constant blade height, which corresponds to that at the exit of the mixing section.
• the throwing blades each have an approximately semicircular cross-section that is open toward their loading side, that a radial inner section of each throwing blade is designed as a mixing section with a blade height that decreases in the radial direction and that a radial outer section of each throwing blade is designed as a calming element that extends the inner section route is formed, wherein the length of the outer portion corresponds to three to eight times the blade height at the exit of the inner portion.
• the semicircular blade cross-section enables a particularly violent transverse vibration of the scattering material particles in the area of the mixing section, the vertical component of which is particularly pronounced due to the shape of the blades and the rotational movement.
• This vibration is used for the intimate mixing of the dry granulated thawing material with the liquid which is only admixed immediately before it is applied to the spreading disc.
• a certain length of the calming section is particularly conducive to this. It is sufficient if, in a preferred variant, the outer section of the throwing shovel has a constant shovel height, ie it is not necessary for the shovel cross-section to decrease progressively towards the shovel end.
• a scattering material beam is formed in the center of the throwing vane, which extends in a straight line and also emerges straight from the throwing vane, which allows large throwing distances that are stable against wind influences before it dissolves, so that a regular, repeatable spread pattern can be achieved.
• the blade shape according to the invention thus combines an increase in the mixing effect with an improvement in the scatter pattern, both objectives which are generally prerequisites for one economical, yet effective use of grit can be recognized.
• brine and salt crystals result from the fact that the length of the outer section is at least 3 times its blade height. In this case, 5 to 8 times the blade height represents a particularly favorable embodiment.
• This embodiment entails that the end sections of the throwing blades protrude beyond the edge of a conventional spreader. However, this has no negative influence on the function of the scattering device.
• the upper edge area of the outer section is cut out towards the end of the blade.
• an additional improvement of the mixing effect is achieved in that an upwardly conically tapered baffle is arranged in the center of the spreading plate and that the adjacent ends of the Throwing heaps are arranged at a distance from the circumference of the impact body on the divider side.
• an increased mixing effect in the deflection zone between the impact body and the inner ends of the throwing blades, since the spreading material occurring there is entrained by the friction with the surface of the rotating spreader and is consequently additionally circulated.
• the height of the throwing bucket in the entrance area of the measuring section is clearly above the requirements for maximum throughput of grit, while the height of the throwing bucket in the area of the calming section just permits the unhindered passage of grit. In this way, a straight stream of scattering material is achieved.
• 1 is a plan view of the throwing shovel with three cross sections A, B and C,
• Fig. 2 shows a radial section through a spreading plate with a throwing shovel according to FIG. 1 in side view
• Fig. 3 is a speed diagram related to a grit particle as it passes through a throwing pusher.
• the figures of the drawing show an exemplary embodiment of a throwing shovel 1, approximately on a scale of 1: 2.
• the cross-sectional profile of the throwing shovel from the inside to the outside is illustrated by the sections A, B and C to the associated section planes AA, BB and CC shown in FIG. 1.
• the section plane BB corresponds to a transition plane U between an inner section 2 and an outer section 3 of the throwing shovel 1.
• a mixture of these two components flows from a chute (not shown) into the annular space between the inlet cross section E of the throwing blades 1 and a conical impact body 4, which is fastened centrally on a flat spreading plate 5.
• the latter, as well as the impact body 4, are indicated by dashed lines.
• the plane of the spreader plate 5 extends obliquely to its axis of rotation R, in such a way that the top of the spreader plate 5 forms an angle with the axis of rotation R that is slightly below 90 ° (for example 84 °). Only for the sake of simplifying the drawing, a scatter plate 5 running perpendicular to the axis of rotation R has been shown.
• the length of the throwing blades is approximately 280 mm
• the radius of the spreading disc is approximately 300 mm
• the throwing blades being arranged such that their end sections 7 protrude about 50 mm beyond the edge of the spreader.
• the cross-sectional shape of the throwing blades is approximately semicircular, the diameter decreasing starting from the input cross-section E to the transition plane U.
• the upper edge area of the outer section 3 of the throwing pusher 1 is cut out, with a bevel cut 5 which is linear in plan view being selected according to FIG. 1.
• the spreading material jet By influencing the spreading material jet, it is possible to generate a bundled spreading material jet that is suitable for large throwing distances with a uniform throwing pattern. As a result of the semicircular shape of the throwing shovel, the particles which form the scattering material jet are given a swirl which additionally stabilizes the scattering material jet.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Crushing And Pulverization Processes (AREA)
• Road Paving Machines (AREA)
• Mixers Of The Rotary Stirring Type (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6385833

Family Applications (1)

Country Status (3)

Families Citing this family (1)

Citations (4)

• 1989
  • 1989-07-26 DE DE3924656A patent/DE3924656C1/de not_active Expired - Fee Related
• 1990
  • 1990-06-15 EP EP90909666A patent/EP0435977B1/de not_active Expired - Lifetime
  • 1990-06-15 WO PCT/EP1990/000938 patent/WO1991002123A1/de active IP Right Grant
  • 1990-06-15 DE DE9090909666T patent/DE59001125D1/de not_active Expired - Fee Related

Patent Citations (4)

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