JPS5920616A - Abrasion board for concrete mixer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a drum-shaped mixing tank, in which at least one mixing shaft is supported horizontally, and the mixing shafts are intertwined with each other in a spiral shape and are integrally formed. two worm belts with helical faces oriented perpendicular to the mixed sliding tangent and matching bits, the worm belts being configured as support helices; is divided into receiving compartments for the wear plates which are arranged next to each other without any gaps with mutually rounded and flat partial surfaces, the wear plates being separated from the worm belt on the opposite side from the supply side. Concrete mixer mixers that are engaged and movably connected.

This type of mixing device is described in German Patent No. 231157 of the Federal Republic of Germany.
9@, and at the heart of this patent is the issue of easy adjustment of the wear plate.

Due to the fact that the worm belt and the supporting spirals and wear plates constituting this worm belt 1 are oriented perpendicularly to the tangent of the mixing tank drum, these wear plates can be 1-Exposed to strong mixed material flow and wear during upward movement. Furthermore, it has been demonstrated that the fixing holes in the wear plate also promote wear. This is because grooves are formed on the surface of each 1f wear plate from those holes.

The essence of the problem underlying the invention is to improve the above-mentioned mixer so as to prevent the wear plates from wearing out and to make them last longer.

The above object is achieved by leading the wear plate obliquely relative to the helical surface of the support helix, ie with the edge facing the mixing tank drum.

Another advantageous front collar was obtained by a modified angle of attack between the wear plate and the support helix. The free space for fixing the wear plate can be used in the following way: by inserting the fixing element into a pocket corresponding to its shape, it is possible to easily insert the fixing element into the wear plate without pushing it into the wear plate from above. A particular advantage is that it can be installed.

The figures showing examples will be described in detail.

Figure 1 shows the entire concrete mixer. Between the two machine frames there is a drum-shaped, horizontally supported mixing tank 11.

A horizontal mixing shaft 14 is supported on the two mutually overlapping end-side mixing tank walls 12, 13 and on the respective machine frame. This mixing shaft has mixing arms 15-18 extending radially close to the mixing tank wall, and at the ends of these mixing arms there are two supporting spirals 25. 26, these support spirals each start from one of the two end-side mixing vessel walls 12.13 and extend diametrically towards each other in the longitudinal direction of the mixing layer 11 of the mixing vessel. It extends beyond the center to a distance from the respective end mixing vessel wall forming a turning chamber for the mixed material.

The support spirals 25, 26 are each fixed to a rotating mixing arm in the area of the end moisture metering walls 12 and 13. There are also two separate mixing arms 15.
16, 17, and 18 are fixed in the same way. During operation, the mixed material is moved alternately on the convection principle from one end-side mixing tank wall 12, 13 to the other with a horizontal feed effect in the region of the tank wall, and is then mixed with the remaining mixed material in a circulation process. Ru. Replacement of mixed materials is rapid and effective regardless of type.

The support spirals 25 and 26 have, on their feed sides, directly adjacent receiving compartments 21 . In this receiving compartment, wear plates 28 made of a particularly hard and highly wear-resistant alloy can be fixed, which are arranged next to each other without gaps.

Inside the storage compartment 21 there are a mutually angled flat surface 29, a protruding guide bar 30, and an elongated hole 31. In German Patent No. 2,311,579, these guiding and fixing elements 30, 31 are fitted with the rear side of the wear plate opposite the feed side. In this case, the wear plate 28 is fixed in its installed position with the correct spacing up to the mixing tank wall.

The supply surfaces of the wear plates 28 that are arranged adjacent to each other on one spiral form a solid when they are continuously transferred to each other and warped uniformly, and this helix 70 surface is used as the mixing surface on the end surface side. 1 wall 12.13
(this mixing) continues on the 7-m to the supporting position of the mixing shaft 14.

The present invention improves upon this known and still generally trusted arrangement as follows. Is it 1? The wear plate 28 does not rest on the flat surface 29 of the support helix 25, 26 with its back side, but is arranged obliquely and significantly elongated so that the edge facing the mixing tank drum leads with respect to the direction of rotation of the mixing shaft 14. .

The navigational tilt position is determined by the wear plate 2 constructed according to the present invention.
8 is directed towards the inside of the mixing tank.
5.26 and overlapping the guide bar 30 of this support helix, a bearing 4 is provided on the underside of the wear plate 28, i.e. in the rear area.
This can be obtained by setting 0.

The wear plate 28 is thus tilted -C relative to the plane defined by the support spiral surface.

In the development of this wear plate arrangement, which is advantageous with respect to wear, the free space 41 obtained by the inclined position between the wear plate lower side and the supporting helix surface is connected to the bearing connected to the wear plate 28 and to this bearing. It is utilized as long as a releasable connection between the wear plate 28 and the support μlυ25.26 is made through a fastening member that engages with the support and enters the elongated hole 31 in the support /υ25.26. . In this way, holes extending through the wear plate 28 as a whole are prevented from forming in the surface of the wear plate 28 at the leading edges and corners.

In the illustrated embodiment, the bearing is realized by providing a slitted frustoconical projection 42 along the generatrix. This truncated cone is hollow inside, so that the head of a screw can be inserted through the opening in the generatrices, creating a space. On the free end surface, a truncated cone is configured to provide a shoulder-like contact surface for the head of the screw.Moreover, the free end surface of the truncated cone is beveled;
If the inclination position of the wear plate 28 is as determined, said end face is aligned with the corresponding planar partial face 2 of the support helix 25,26.
It is placed on top of 9.

The wear plate 28 thus rests on the receiving compartment 21 via the front edge, the bearing 40 and the projection 42. As in the case of DE 23 11 579, the best method of adjusting the wear plate 28 by linear sliding on the flat part surface 29 is maintained.

FIG. 3 shows screwed onto the support spiral 25, 26,
A wear plate 28 constructed according to the invention is shown in cross section.

The tilt position is characterized and defined by the angle α.

The illustrated bearings 40 are spaced far enough apart so that a screw 43 can be passed through as a fastening element. Wear plate 2
A truncated cone-shaped projection 42 is provided approximately at the center of 8. This protrusion is a slit extending from the side surface of the support portion 40 toward this side. The free end surface of the protrusion 42 is beveled to match the inclined position of the wear plate 28, and its surface lies on the support spiral.

Furthermore, said end face is tapered in the form of a collar and is configured to provide a resting shoulder for the screw head.

Said screw is designated at 43. This screw is wear plate 2
8 is passed through a truncated conical protrusion 42 between the bearing parts 40, and the threaded portion protrudes from the free end surface of the protrusion 42. The head of the screw contacts the inside of the collar-like constriction.

The wear plate 28 rests on the corresponding portion of the support helix 25, 26 by means of loose screws 43. screw 4
The threaded portion 3 is passed through a corresponding elongated hole 31, and is fixed from the back side with a screw nut. The individual wear plates 28 are clamped by the respective partial surfaces 29 of the receiving compartment 27 via their bearings 40 and the end faces of the truncated conical projections 42 . By releasing the screw connection, each wear plate 28 can be slid and fixed anew.

With the configuration according to the invention of the threaded connection between the wear plate and the support helix, a smooth surface throughout is possible for the surface of the fixture exposed to the mixed flow without interruption by threaded holes. The arrangement according to the invention significantly increases the life of expensive wear plates, since the oblique positioning of these wear plates also has an effect in reducing wear and tear on them.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the entire mixing device; FIG. 2 is a view showing a support spiral of the mixing device with a wear plate configured according to the invention;
FIG. 3 is a cross-sectional view of the support helix and wear plate. Reference numerals 25 and 2 in the figure (3... support spiral 28... wear plate.

Claims (1)

[Scope of Claims] 1) It has a drum-shaped mixing tank, in which at least one mixing shaft is supported horizontally, and the mixing shafts are intertwined with each other in a spiral shape and are integrally formed. It has two threaded worm belts with helical surfaces oriented perpendicular to the mixing sliding tangent and a matching pitch, these worm belts being configured as support spirals, 1. These support helices are divided into receiving compartments for the wear plates which are arranged next to each other without any gaps with mutually rounded and flat partial surfaces, and the wear plates are arranged on the opposite side of the supply side. A-
In a mixing tool for a concrete mixer that is movably connected to the belt in a non-frictional engagement, the wear plate (28
) supporting the helix (25, 26), which is arranged obliquely relative to the helical surface of the helix (25, 26), and is characterized by being preceded by the edge facing the mixing tank drum. Ingredients. 2) The wear plate (28) supports the inner edge (25°2
6) Mixing device according to claim 1, characterized in that it has a support (40) in the region of the outer edge corresponding to the tilted position, resting on it. 3) The wear plate (28) is attached to the opposite side of the supply side.
) and a support spiral (25, 26), the mixing device having a bearing for accommodating and holding a fixing member for connection with the support spiral (25, 26). 4) The structure of the bearing part is as follows: a) wear plate (2
8) A substantially truncated conical extension (42) approximately in the center of the back surface of the
[With No C, b) The truncated cone is hollow to match the fixed member, C) The end face of the truncated cone is shaved diagonally to match the inclined position of the wear plate (28), d) The truncated cone e) The generatrix of the truncated cone is made into a slit from the open side given by the inclined position of the wear plate (28) to the end face in line with the fixing member. As a result of the above, a pocket-shaped cutout for introducing the fixing member having a shoulder for supporting the fixing member oppositely is formed.
The mixing tool according to claim 3). 5) Mixing tool according to any one of claims 2) to 4), characterized in that the wear plate (28) is constructed as a one-piece casting together with the bearing (40) and the frustoconical extension (42).