CZ304502B6 - Idler assembly for conveyor belts of steep-incline belt conveyor - Google Patents

Abstract

The aim of the present invention is to achieve a perfect cover of both the bottom and top belts (16) and (17) of a belt conveyor when being filled up with bulk material. Conveyed bulk material of given grain size and mechanical-physical properties is supplied and subsequently entrained by a conveyor carrying belt (16) covering from above a cover belt (17). In such a manner, bulk material is enclosed in a slot performed by both the carrying and cover belts (16) and (17) thus isolated from environment. Through gradual increase of the incline angle of conveyance, the own weight of the cover belt (17) is not sufficient to prevent, due friction forces, the movement of material grains counter the direction of conveyance. In order to recover a faultless conveyance it is therefore necessary to increase pressure of the cover belt (17) relative to the surface of the conveyed material and thus friction forces in contact surfaces of the conveyor belts with entrained material. This can be done through the mediation of the idler assembly according to the present invention.

Description

Technical field

The technical solution deals with the improvement of transport of mainly bulk materials by belt conveyors. More particularly, the technical solution relates to a roller stand arrangement for steep belt conveyors.

BACKGROUND OF THE INVENTION

At present, great emphasis is placed in this field on constructions dealing with vertical conveying using continuously, continuously working modern steep belt conveyors. This trend has led to a great development of these structures, including new designs of pressure rollers.

One of the devices that are currently in use are solutions developed based on CA 1280993 C. This document describes solutions to the subject. However, the device does not allow flexible responses to changes in the amount of material. Other possible solutions used in this field are JP 6305530 A and JP 8198453 A, with a specially profiled conveyor belt which is closed on both sides by a pair of rollers. Another representative of commonly used devices is JP 9183504 A, where the upper rollers abut directly on the conveyor belt and are spring-loaded so that they are able to react and close the conveyor belt at the same locations. Technical solutions protected by documents JP 10175713AaJP 10181823 A are a diamond-shaped cross-section, and this shape limits their usefulness.

It follows from the foregoing that devices with structural constraints are currently used in this field in terms of shape, thereby limiting their usefulness only to certain types of material.

SUMMARY OF THE INVENTION

These disadvantages are largely eliminated by the technical solution according to the invention. The design of the technical solution is designed so that the lower and upper covering strip of the conveyor belt is perfectly covered when it is filled with loose material.

Increasing the limit (permissible) angle of inclination of traffic (given by valid ČSN standards) can be realized by several principles. One possible way is to increase the pressure of the conveyed material against the smooth surface of the supporting conveyor belt by means of the own weight of a supplementary so-called covering conveyor belt. The additional belt increases the pressure of the conveyed mass against the carrier conveyor belt, increases the frictional contact surface and prevents the return of the conveyed grains of the material relative to the directions of movement of the two belts.

The bulk material to be conveyed, given the granularity and mechanical-physical properties, is fed and subsequently entrained by a carrier conveyor belt which covers the covering belt from above. The bulk material is thus enclosed in a slot formed by the carrier and covering conveyor belts and is thus isolated from the surrounding environment (eg weather conditions) and at the same time the negative properties (eg dustiness, odor, etc.) of the conveyed material do not affect the surrounding environment.

By gradually increasing the angle of inclination of the conveyor, the actual weight of the cover strip is not sufficiently large to prevent, due to frictional forces, the movement of the material grains against the direction of conveyance. The frictional forces in the contact surfaces of the conveyed material relative to the contact surfaces of the belts are thus lower than the components of the weight of the conveyed material. For a trouble-free realization of transport, it is necessary to derive a higher pressure of the covering strip against the surface of the conveyed mass and hence also

Frictional forces in the contact surfaces of conveyor belts with entrained material. This can be ensured by the pressing mechanism which is the subject of the present application.

The roller stand for conveyor belts of a steep belt conveyor consists of a frame structure, fixed by means of screw connections to the conveyor belt of the belt conveyor. At least one support roller of the upper branch of the support conveyor belt is attached to the lateral sides of this frame structure. Above it, two pressure support rollers of the edges of the cover conveyor belt and the cover conveyor belt are detachably and unilaterally connected to the sides of the frame structure.

Above the cover conveyor belt there are rocker arms with upper support rollers. These rocker arms are releasably connected to the upper frame structure via a cylindrical compression spring. The compression spring is mounted in cup-shaped holders which are located in the lower holders anchored in the central profiles. The cup holders are secured by a bolt that passes through the longitudinal with the stop and nuts. The upper structure is connected to the conveyor track by screw connections passing through the connecting brackets.

The rocker arms with the upper support rollers are mounted movably in the vertical direction relative to the brackets. The width of the frame structure is adapted to the width of the supporting conveyor belt.

The upper branch of the roller stand can also be designed to be composed of two support rollers. The outer ends of these rollers are detachably anchored in the frame structure. The anchoring angle in the frame structure is given by the angle of the covering conveyor belt. The inner ends of the rollers are anchored in the center bracket.

Another design modification of the upper branch of the roller stand consists of two side support rollers, the outer ends of which are detachably anchored in the frame structure and the central roller. The anchoring angle to this frame structure is given by the angle of the support conveyor belt. The inner ends of the side support rollers are anchored in the center holders, as are both ends of the center roller.

The thrust rollers are anchored at their outer ends at the same angle as the rollers by their outer ends. The curvature of the sides of the frame structure corresponds to the shape of the covering conveyor belt. The sum of the lengths of all the rollers of the upper leg of the roller stand is adapted to the length of the support conveyor belt.

Overview of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates the construction of a roller stand for conveyor belts of a steep belt conveyor utilizing a straight conveyor belt loading profile, in an axonometric view, and FIG. 2 is an elevational view. Figure 3 shows a detailed cross-sectional view of the cover belt thrust mechanism implemented by a compression roller spring.

Figure 4 shows an axonometric view of a roller stand design for conveyor belts of a steep belt conveyor using a trough conveyor belt profile. The loading profile of the supporting conveyor belt consists of a three-roll mill.

Figure 5 shows an axonometric view of a roller stand design for conveyor belts of a steep belt conveyor using a trough loading profile of a conveyor belt. The loading profile of the supporting conveyor belt consists of a two-roller stand.

-2GB 304502 B6

DETAILED DESCRIPTION OF THE INVENTION

Example 1

Roller mill for conveyor belts of a steep belt conveyor using a straight conveyor belt profile, as shown in Figure 1, consists of a frame structure 1, known as a sleeper, which is fastened to the conveyor belt by means of screw connections 10. 2 upper branches of the conveyor belt. The axis of the support roller 2 is terminated on both sides by flattening or, in order to prevent the roller from falling out of the sleeper holder, by an external or internal thread.

The frame structure 1 comprises two thrust rollers 3, which secure the edge pressure of the cover conveyor belt 17 and the support conveyor belt 16 and thus prevent the grain from being conveyed over the edge of the support belt. The thrust rollers 3 are realized with a one-sided axis, they are mechanically connected to the frame structure 1 by means of nuts by means of an external thread. In the frame structure I, an elliptical opening is provided in order to optimally grip the thrust rollers 3, for example at different conveyor belt thicknesses.

Another part of the roller stand for the conveyor belts of the steep belt conveyor is the upper frame structure 9, which is connected to the conveyor belt track by means of screw connections 10. The upper frame structure 9 is formed, see Figure 2, by a longitudinal 12. and the two central profiles 13. The lower brackets 14 of the rocker arms 5 are mechanically slidably mounted in the vertical direction against the center profiles 13 by means of screw connections. The purpose of the lower brackets 14 and the rocker arms 5 is to achieve optimal contact of the support rollers 4 with the cover strip 17 at differently filling the carrier conveyor belt 16 with the conveyed material. Different loading of the conveyor belt with the conveyed material causes a change in the cross-section of the belt filling.

Changing the cross-section of the belt fill has a major effect on the distribution of materials in the cross-section of the conveyor, since the usable belt width (i.e., the loading width of the belt) and the height of the belt canopy canopy are changed. In the case of a different cross-section of the filling, the pressure and optimal contact of the support rollers 4 with respect to the surface of the cover strip 17 is ensured by a mechanism comprising a coil spring 8 and a screw 6 with a nut 7.

The principle of operation of the spring mechanism is shown in Figure 3. When the height of the spherical canopy of the belt filling changes, the screw 6 moves vertically. The contact of the supporting rollers 4 with the cover band Γ7 is ensured by their mounting in the rocker arms. The lower displacement of the lower holders 14 is provided by a coil compression spring 8, which is mounted in two cup-shaped holders 15. The cup-shaped lower bracket 15 is secured against sliding out of the bolt 6 by a nut 7. The maximum height of the vertical displacement of the lower brackets 14 with the rocker arms 5 can be adjusted by the upper nut 7 of the bolt 6 contacting the stop 18 attached to the upper surface. the side member 12 of the upper frame structure 9.

Example 2

The roller stand for conveyor belts of a steep belt conveyor using a trough conveyor belt profile according to Figure 4 differs from Example 1 in that it consists of a frame structure 1, called a sleeper, which is fastened to the conveyor belt by screw connections. Side frame rollers 19 and middle roller 20 of the upper branch of the conveyor belt are mounted in the frame structure 1. The axes of the side support rollers 19, and the central roller 20 are terminated on both sides by flattening, or, to prevent the roller from falling out

-3GB 304502 B6 from sleeper holder, with external or internal thread. Both ends of the central roller 20 and the inner ends of the side support rollers 19 are retained in the central holders 21.

Example 3

The roller stand for conveyor belts of a steep belt conveyor using a trough profile of the conveyor belt of Figure 5 is formed by a frame structure i, a so-called sleeper, which is fastened to the conveyor belt of the conveyor by screw connections. In the frame structure 1 the support rollers 2 of the upper branch of the support conveyor belt are mounted. The axes of the support rollers 2 are terminated on both sides by flattening or, in order to prevent the rollers from falling out of the sleeper holder, by an external or internal thread. The inner ends of the support rollers are mounted in the central holder 21.

Industrial applicability

It is in the field of transport and handling technology, continuous transport of particulate matter.

Claims (7)

PATENT CLAIMS Roller mill for conveyor belts of a steep belt conveyor, characterized in that it consists of a frame structure (1) which is fastened to the support line of the conveyor belt by means of screw connections (10), the lateral sides of said frame structure (1) being at least one support roller (2, 19, 20) of the upper branch of the support conveyor belt is attached, above which two pressure support rollers (3) of the edges of the support conveyor belt (16) and the cover are detachably and unilaterally connected to the sides of this frame structure (1) of the conveyor belt (17), over which the rocker arms (5) with upper support rollers (4) are located, these rocker arms (5) are supported by a cylindrical compression spring (8) housed in cup-shaped holders (15) located in the lower holders (14). ) anchored in the central profiles (13), detachably connected to the upper frame structure (9), which is The cup-shaped holders (15) are secured by a screw (6), which passes through a longitudinal (12) with a stop (18) and nuts (7). Roller mill for conveyor belts of a steep belt conveyor according to claim 1, characterized in that the rocker arms (5) with upper support rollers (4) are movably mounted relative to the holders (14) in a vertical direction. Roller mill for conveyor belts of a steep belt conveyor according to claim 1, characterized in that the upper branch of the roller mill is composed of two support rollers (2), the outer ends of these rollers (2) being detachably anchored in the frame structure (1) , the anchoring angle of this frame structure (1) is given by the angle of the covering conveyor belt (17) and the inner ends of the rollers (2) are anchored in the central holder (21). Roller mill for conveyor belts of a steep belt conveyor according to claim 1, characterized in that the upper branch of the roller mill is composed of two lateral support rollers (19) and the outer ends of which are detachably anchored in the frame structure (1), to this frame structure (1) is given by the angle of the support conveyor belt (16) and the center roller (20), the inner ends of the side support rollers (19) being anchored in the middle holders (21) as well as both ends of the center roller (20) . -4GB 304502 B6 Roller mill for conveyor belts of a steep belt conveyor according to claims 3 and 4, characterized in that the thrust support rollers (3) are anchored to the frame structure (1) with their outer ends at the same angle as the support rollers (2). 5 Roller mill for conveyor belts of a steep belt conveyor according to claims 3 and 4, characterized in that the curvature of the lateral sides of the frame structure (1) corresponds to the shape of the covering conveyor belt (17). Roller mill for conveyor belts of a steep belt conveyor according to claims 3 and 4, characterized in that the sum of the lengths of all the rollers (2, 19, 20) of the upper leg of the roller mill corresponds to the width of the supporting conveyor belt (16).