JPS6218005B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a guide device for bulk material flow;
It comprises a measuring device for detecting the horizontal force component and a measuring surface (reaction force plate) for deflecting the bulk material flow, which is coupled to the measuring device, and the outflow part of the guiding device and the measuring surface face each other. The present invention relates to a measuring device for detecting the feed strength of a flow of bulk material such as those arranged in parallel.

It is known to measure the feed strength of a bulk material stream by dropping the conveyed material from a predetermined fall height onto an inclined flat reaction plate.

In particular, the impact on the reaction plate in certain relationships, such as the height of the fall, the friction between the bulk material and the reaction plate, the impact factors, the type of conveyed material and its particle size, are of equal value. The impact force is proportional to the feed strength, and this proportionality factor is detected and adjusted during operation. The reaction plate is tilted at an angle of less than approximately 60° to allow rapid flow of bulk material. Furthermore, only the horizontal component of the impact force is detected by the measuring device in order to avoid changes in self-weight due to material adhering to the reaction plate.

In a known device for continuously measuring the quantity of a raw material stream consisting of bulk solids (see German Patent Publication No. 2 327 624), a centrifugal rotating wheel with entraining elements is provided. The ring accelerates the material stream to a high velocity that is approximately equal for every feed particle. This cylindrical centrifugal rotating ring is additionally provided with a guide plate that limits the passage over a part of its outer periphery, into which the material stream is introduced by the centrifugal rotating ring. and is guided by a reaction plate that deflects the bulk material flow. This reaction plate is connected to a measuring device for detecting the horizontal force component, the outlet of the guide device and the reaction plate being arranged opposite each other. Such devices require additional drive means (centrifugal wheels, drive motors, etc.) and are not generally applicable and are only suitable for certain bulk solid objects.

The object of the invention is to create a generally applicable measuring device for detecting the feed strength of a bulk material stream, which does not influence the measuring direction and therefore the measuring results. The goal is to create the device so that only a small amount of frictional force is generated on the measuring surface. In this case, the influence of the impact of the bulk material flow on the measuring surface should be kept to a minimum. The guiding device consists of a guide chute onto which the bulk material can be fed in free fall, the guide chute receiving the flow of bulk material with little impact and directing it diagonally downward. For deflection towards the measurement plane, the guide chute is steeply sloped in its upper part and somewhat more gently in its lower part, with a continuous slope between these two parts. and such that the bulk material flow coming from the guide chute impinges at an acute angle (less than 90°) to the measuring plane,
This problem is solved in that the measurement plane is arranged substantially in a vertical plane. The claims also cover embodiments of the invention.

In the measuring device according to the invention, only a small amount of friction occurs between the conveyed material and the reaction plate when the measuring surface is hit by the flow of bulk material, since the conveyed material is in contact with the measuring surface only for a short time. Because they don't. By selecting the impact angle appropriately, the effects of impact can furthermore be kept low. Since only the horizontal component of the force generated thereon is detected on the measurement surface, even if there is a frictional force that also extends in the vertical direction on the measurement surface, which is disposed approximately vertically, it will not affect the measurement results.

The measuring surface for the guide chute is formed curved (concavely) around the horizontal axis, the degree of curvature being configured in a particularly desirable manner such that the flow of bulk material is deflected by approximately 40-60° from the direction of contact. The influence of the impact of the bulk material impinging on the measuring surface can be significantly eliminated, especially when the bulk material flow impinges on an approximately tangentially curved measuring surface. The resultant force of the frictional forces on the individual track segments of the curved measuring surface extends approximately vertically in such an arrangement and therefore has virtually no horizontal component that can influence the measuring device.

In order to also eliminate the influence of friction on the guide chute and thus to maintain a constant speed of contact of the bulk material stream with the measuring surface, it is more expedient to support the guide chute so that it can vibrate and to provide a vibration generator. It is true.

The invention will now be illustrated by embodiments shown in the drawings and will be explained in detail in the following specification.

FIG. 1 shows a measuring device for detecting the feed strength with a flat reaction plate 1 set vertically, which reaction plate is suspended on a vertical elastic band 2 and It is supported in the measuring cell 3 in the horizontal direction. The vertical component of all forces applied to the reaction plate 1 is absorbed by the elastic band 2. The horizontal component is transmitted to the measuring cell 3 and converted into a proportional output signal and indicated in the electrical part of the device.

The conveyed material 4 is dropped from the vibrating groove 5 and taken up by the guide chute 6. This guide sheet has an inclination angle of approximately 80° at its upper end.
At the lower end of the guide chute, the bulk material is placed on the reaction plate 1.
It is curved to such an extent that it abuts at an angle of inclination of approximately 45° or less. The vertical friction force component generated on the reaction plate is absorbed by the elastic band 2.

The guide chute 6 is mounted so as to vibrate on a rubber damper 7 and is vibrated by a magnetic exciter 8 . By vibrating the guide chute 6 and because the friction occurring therein is significantly reduced, the frictional forces damping the conveying stream no longer influence the velocity of the conveying stream. The final velocity of the conveying flow at the lower end of the guide chute 6 is therefore practically unaffected by the frictional force between the bulk flow and the chute and remains approximately constant.

FIG. 2 shows that instead of a flat reaction plate, a curved measuring surface 9 takes over the bulk material flow 4 approximately tangentially.
A force measuring device is shown that is deflected by an angle of approximately 60° from its direction of contact. The curved measuring surface can be produced, for example, from a cylindrical armored body. The plane of symmetry of the measuring surface is substantially horizontal, and the arrangement is such that the resultant force of the frictional forces extends substantially perpendicularly to the measuring surface, so that no force is applied to the force measuring device. Other arrangements correspond to those shown in FIG.

[Brief explanation of the drawing]

Fig. 1 shows a feed strength measuring device with a guide chute supported in a vibrating manner and a measuring surface disposed perpendicularly, and Fig. 2 shows a feed strength measuring device with a guide chute supported in a vibrating manner and a measuring surface disposed vertically. This shows a strength measuring device. Reference numbers in the figure indicate the following: 1... Reaction plate, 2... Elastic band, 3... Measurement cell, 4...
... Bulk material flow, 5 ... Vibration groove, 6 ... Guide chute, 7 ... Rubber shock absorber, 8 ... Vibration generator, 9 ... Measurement surface.

Claims (1)

[Claims] 1. A guiding device for the bulk material flow and a measuring surface (reaction force plate) for deflecting the bulk material flow, which is coupled to a force measuring device for detecting the horizontal force component. In the measuring device for detecting the feeding strength of a flow of bulk material, the guide device is provided with a flow of bulk materials, in which an outflow portion and a measuring surface of the guide device are disposed facing each other. It consists of a guide chute 6 onto which the load material 4 can fall freely and be fed, and the guide chute 6 receives the flow of bulk material 4 with almost no impact and measures it diagonally downward. The guide chute 6 is sloped significantly in its upper part and somewhat more gently in its lower part so as to deflect towards the planes 1, 9;
The slope changes continuously between the upper part and the lower part of both of these measuring surfaces, such that the flow of bulk material coming from the guide chute 6 strikes the measuring surfaces 1 and 9 at an acute angle. A measuring device characterized by being arranged in a substantially vertical plane. 2. The guide chute (6) is provided with an inclination at the outlet of its lower part such that the bulk material stream (4) flows away from the guide chute at an inclination angle of approximately 45° or less. measurement device. 3. The measuring device according to claim 1, wherein the measuring surface 9 facing the guide chute 6 is curved concavely around a horizontal axis. 4. The inclination at the outflow portion of the guide chute 6 and the degree of curvature of the measurement surface 9 are adjusted as follows, that is, the bulk material flow 4 is adjusted so that it hits the measurement surface 9 in a substantially tangential direction. A measuring device according to claim 1 or 3, characterized in that: 5. The measuring device according to claim 4, characterized in that the degree of curvature of the measuring surface 9 is such that it deflects the bulk material flow 4 by about 40 to 60 degrees from the direction of contact. 6. The measuring device according to claim 1, wherein the guide chute 6 is supported so as to be able to vibrate and is equipped with a vibration generator 8.