JPH03500874A - Method and apparatus for regulating the flow of crushed material from a storage hopper - 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] Method and apparatus for regulating the flow of crushed material from a storage hopper The present invention has an outlet aperture located at the lower end, which cooperates with the rocking group to open the material outflow. The door is directed downwardly to close the exit aperture in its closed position. ore from hoppers or similar structures of the type containing containers that are narrowed by The present invention relates to a method and apparatus for regulating the flow of crushed material such as limestone.

A storage hopper with a rocking group of this type is known from 5E-D-8601161-6. This is used as a reference for the structural principle of the oscillating group.

Material typically falls from a storage hopper onto a conveyor belt, which transfers the material to the desired material. The idea is to transport it to a processing location, material storage location, or next transportation facility. These controllers The conveyor belt moves at a virtually constant speed, and the rate at which material is poured from the hopper is determined by the outflow opening. By adjusting the dimensions of the holes, i.e. by adjusting the position of the rocking group. controlled. However, this control method is hampered by several drawbacks. For example, In the case of crushed, free-flowing material, the material flows out through the outflow apertures and onto the conveyor. A large amount of dust is generated when it falls onto the belt. For coarse materials, closed When stored in the hopper for a long period of time, the materials tend to form cross-linked clumps by themselves, This will prevent material from flowing out when the cap is opened. This condition is usually hot removed by a device that vibrates the walls of the But in such cases, this kind of shaking If the bridge suddenly collapses as a result of the movement, the weight of the material falling onto the trunk belt will There is a risk that the conveyor belt will be overloaded and damaged. It is true that this danger is due to the size of the outflow opening. This can be reduced by making the diameter smaller, but this increases the risk of new crosslinking. Connect.

The aim of the invention is to reduce or eliminate these disadvantages and to Provide hoppers and similar storage outlet facilities that can be easily controlled to discharge That's true.

This object is achieved according to the invention by the features set out in claims 1 and 2 respectively. This is accomplished by a method and apparatus comprising: Bring the conveyor belt closer to the outflow aperture This reduces the falling height of the material and thus also reduces the transport of dust from dust-generating materials. Flows freely by changing the belt speed. Material flow can be constricted by reducing belt speed, reducing dust generation. However, due to the material falling from the hopper when the self-closing bridge collapses, Belt overloading can be prevented by temporarily increasing the belt speed.

These features of the invention and the advantages brought about by them are illustrated in the accompanying drawings below. It will become clearer from the description of the embodiments of the present invention with reference to FIG. 1 is a schematic longitudinal sectional view of a device according to the invention; FIG.

Figure 2 shows when the rocker screen is partially open and the conveyor belt is moving at high speed. Fig. 2 schematically shows the outflow of material in a longitudinal section.

In the 's3 figure, the swing wJJj'j is partially opened and the conveyor belt is moving at low speed. FIG. 3 schematically shows the outflow of material during the filling in a longitudinal section; FIG.

Figure 4 illustrates the flow of material when the swing group is completely opened in a longitudinal cross-sectional view. 5 is a cross-sectional view of the device shown in FIG. 4.

The lower part of the apparatus shown in FIG. 1 is shown. Before and after slanting respectively It comprises a container 1 of rectangular cross section with walls 2 and 3 and both side walls which are also inclined. Ru. The walls of the container terminate in vertically extending lower parts 4 and 5 of the front and rear walls, which is a partially arcuate rim that forms a vertical drainage path for the container. It is joined by a vertical part of the side wall. The swing group 6 is supported by the shaft end on the side wall of the container. It is rotatably supported by two wooden arms. $6 has a bottom flap and side walls 8, The part located in front of it is arc-shaped and cooperates with the arc-shaped edge of the outlet on the side wall of the container. It is an attempt to do so. Figure 1 shows the door in its fully open position. Indicated by lines and by dashed lines in closed and intermediate positions.

A variable speed conveyor belt 9 connects the hopper discharge opening formed by the container 1 and the door 6. It is placed a short distance below.

The moving direction of the belt 9 is indicated by an arrow in the figure.

Figures 2 and 3 illustrate the case where material is discharged from the hopper with the door partially open. Indicates that this working mode is suitable for free-flowing or drainable materials, condylar flow-like materials. or aluminum pellets or iron ore pellets; E ), [the pattern of upward material flow is then so-called funnel flow, i.e. corresponds to one in which a stationary ring of material is formed in a container surrounding a conical flow. Therefore, the velocity components of the individual materials include horizontal components.

The ring of material at rest is illustrated by the cross-section in FIGS. 2 and 3, and the material arrangement The flow of material in the center of the cone is indicated by arrows.

The thickness or height of the material discharged onto the conveyor belt 9 changes the belt speed. Adjust. The flow rate of material from the hopper also depends on the belt speed, which allows the material to flow freely through the belt. As long as you are moving fast enough to cause the screen to fall upward, the angle at which you open the screen will circle.

In the case of the example shown in Fig. 2, the belt 9 is moving at high speed, and therefore the belt 9 is moving at high speed. A similar flow pattern is occurring. On the other hand, in the example of FIG. The more material accumulates on the belt that it is prevented from falling freely onto the belt. is driven at a slow speed, thereby constricting the flow of material from the hopper. in this case, The speed at which material is discharged from the hopper is dependent in large part on belt speed. No. The working mode in which the material flow is restricted according to Figure 3 is preferred in the case of dust-generating materials, This is because the slow rate at which the material is discharged from the hopper allows the material to flow freely onto the conveyor. This is because the level of dust generation is significantly reduced compared to methods that allow the product to fall onto the belt. be.

The method using a fully open screen, shown in Figure 4, discharges materials that do not flow freely. applied to prevent the risk of crosslinking. Belt speed causes throttling. material in the area above the door can be considered as a simple free tribute flow. The possible flow pattern, that is, the velocity component of the coarse-grained material is in this region. does not include horizontal components. This is extremely advantageous. free purchase flow This is because the risk of crosslinking is much lower in this case than in the case of funnel flow. Once the material is The probability that crosslinking will occur when the flow is applied is as follows when working according to the method shown in Figure 4. Extremely low.

However, during the transportation of materials in closed hoppers, for example during long-term sea transport, self-closing Cross-linking may occur naturally. Conventional vibrations (not shown) machine into the hopper with the purpose of vibrating the vessel walls and thus collapsing the material bridges. Install. In the case of hoppers fitted with conventional delivery equipment, conveyor belts are When the material is driven at a constant speed, the rack mb<collapses and the material comes out from the brim. , so a large flow rate of this material can overload the belt enough to cause it to jam. To reduce this risk, which can easily become a load, the screen can be partially closed to allow a flow of a given width. 8 apertures are obtained. This certainly reduces the risk of belt overload. However, at the same time there is a risk of spontaneous bridge formation within the drainage aperture. As mentioned above This is because the probability of crosslinking is much higher in funnel flow than in free material flow. Ru. This type of belt overload is achieved according to the invention by reducing the belt speed prior to bridge collapse. increase and then decrease the belt speed to obtain the desired material layer thickness on the conveyor belt. This can be avoided by setting the necessary speed. In this work method, the funnel flow is the hopper discharge. Guarantee that it will never occur in the outbound area.

Finally, when implementing the control method according to the invention, the set position of the door should be It is not changed during the outflow operation, but is compensated for by adjusting the width of the outflow aperture, as in conventional methods. Changes in material properties that occur when conveyor belt speed Compensate by adjustment.

FIG.1 FIG.5 international search report 1 river・++tllll11-^”””+4” kCPc1crac! l’1nE C Jin

Claims (1)

[Claims] 1. It includes a container (1) that narrows downward and forms a material outflow opening at its bottom. The exit aperture cooperating with the swinging door (6) is arranged so that the swinging door (6) swings upwards. ore or stone from a hopper or similar storage vessel that closes the outlet opening at the Depending on the flow properties of the material, methods for regulating the flow of crushed materials such as graystone Adjust the swing door to the partially closed or fully open position using the Maintain the belt speed during the entire material discharge operation and change the belt speed according to the material properties. The belt (9) is a variable speed belt and when the door (6) is in the fully open position, the belt (9) is a variable speed belt. ) is located a short distance below the lower forming surface of the For materials, adjust the door (6) to a partially open position and move the belt (9) at low speed. The flow of material through the outlet is restricted depending on the degree of material accumulation on the conveyor belt. prevent it from falling freely onto the belt; it should flow freely but not create dust. If the material is thick, adjust the door (6) to a partially open position and drive the belt at high speed to remove the material. The material passes through the outlet unhindered by the layer of material deposited on the belt (9). Allow free flow; for materials that do not flow freely, leave door (6) fully open. The belt (9) is driven at high speed so that the material is absorbed by the layer of material deposited on the belt. allow the material to flow freely unhindered; as natural material crosslinking occurs There are measures to temporarily disrupt the natural material bridges that significantly increase belt speed. Measure the outflow of material as taken and the thickness of the material layer discharged onto the conveyor belt. A method characterized by knotting. 2. Swing door (6) that narrows downward and forms a material outflow opening at its bottom. a hopper or similar column containing a container (1) arranged with an outlet aperture cooperating with the In a device for controlling the outflow of crushed material such as ore or limestone, A variable speed conveyor belt (9) is connected to the bottom forming surface of the door (6) when the door is in the fully open position. A device characterized in that it is located a short distance below and below the outflow aperture.