JPS5820847B2 - Belt breakage detection method for belt conveyor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for quickly detecting an accident in which a belt is cut due to vertical cracks or the like in a belt conveyor for conveying ore or the like.

BACKGROUND ART In belt conveyor equipment, accidents such as vertical tearing or holes in the belt (hereinafter simply referred to as vertical tearing) are fatal, and restoration work is time consuming and costly.

/In order to prevent such vertical locking of belts, various equipment has been installed to remove metal fragments, such as metal fragment detection devices, and inspections to prevent foreign matter from entering have been strengthened, but they are still insufficient. Instead, accidents occur one after another due to vertical belt tears.

There is a method to detect this longitudinal crack, which uses a coil or oscillator embedded inside the belt to detect changes in frequency, but it is very expensive and lacks versatility in terms of construction and technology. Although various methods have been proposed, they are not necessarily satisfactory.

Based on the above-mentioned current situation, the present inventor has conducted various experimental studies with the aim of developing a low-cost, technically simple, and easy-to-inspect method for detecting longitudinal cracks in belts.
Focusing on the fact that if an accident occurs in a belt conveyor, ore will inevitably fall from the vertical crack, a conductor consisting of a positive electrode and a negative electrode is installed below the belt on the conveying side. By keeping the conductor in a state where current is constantly applied during operation, it is possible to detect vertical cracks in the belt during conveyance by detecting a short circuit between the positive and negative electrodes caused by falling ore. I found out.

That is, in the present invention, one or more sets of conductors, each consisting of a plurality of parallel wires joined in a comb-teeth shape and alternately combining positive electrodes and negative electrodes, are installed at a desired position between the conveying side and return side belts of a belt conveyor. The conductor is kept in a current applied state at all times during the operation of the belt conveyor, the positive electrode and the negative electrode are short-circuited by the ore falling from the belt breakage, and the current or voltage flowing through the conductor is detected. It is characterized by detecting cut damage.

The present invention will be explained in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing an example of the implementation of the present invention, in which the belt conveyor 1 is in a driving state, and the belt 3 on the conveying side is
The ore is shot onto the top, and the loaded ore is conveyed in the direction of the arrow and supplied to the next process, but as mentioned above, accidents often occur when the belt is vertically cracked while the belt conveyor 1 is being driven. Occur.

This vertical cracking of the belt is caused by foreign substances mixed in the ore, such as liner, at the time of chute from the hopper 2 or at the falling position from the top 3' of the inclined rise of the belt conveyor.
This is thought to be caused by the impact of the steel bar, channel, etc.

When a vertical tear occurs in the belt in this way, the ore being conveyed inevitably falls downward from the longitudinal tear in the belt, making it impossible to convey it smoothly.

Therefore, the present invention is designed to quickly detect accidents by detecting longitudinal cracks.
A conductor 4, which will be described later, is installed below the conveyor belt 3 at the chute position from the hopper 2 and the drop position from the sloped rising top 3', where longitudinal belt tearing is likely to occur.
The conductor 4 is kept in a current applied state at all times during operation, and the positive and negative electrodes constituting the conductor 4 are short-circuited by falling ore due to vertical tearing of the conveyor belt 3, and the flowing current or voltage is detected. , to detect vertical tears in the belt.

An example of the structure of the conductor 4 described above is shown in FIG.

A cathode formed by arranging a large number of wire rods 6 in parallel at predetermined intervals, arranging a common cross member 6' at one end to form a comb-teeth shape, and applying wiring A, and wire rods 7 arranged in parallel in the same manner. cross member 7 at one end of
The positive electrodes are arranged in a comb-like shape and provided with wiring B, with the ends of each electrode facing the inside of the cross members 6' and 7' at a constant interval, and the ends of each electrode facing each other at a constant interval. The ends of both electrodes are integrally fixed using a known insulating material (not shown) to form a mesh having the required area, and the wirings A and B of each electrode are connected to a power source 5. Connect to.

The conductor 4 configured in this manner is arranged horizontally below the conveyor belt 3 (FIG. 1) as described above, and the conductor 4 is maintained in a state where current is constantly applied during operation of the belt conveyor. A vertical tear occurs in the belt, and when the falling ore falls onto the conductor 4, the conductor 4 is short-circuited.By detecting this short circuit by the current value of the ammeter 8, the vertical tear in the belt is detected. can be detected.

What is shown in Fig. 4 is a modification of Fig. 2, in which positive electrodes and negative electrodes formed almost in the same manner as explained in Fig. 2 are arranged with the electrode ends facing in the same direction and the electrode ends facing alternately. As shown in the schematic diagram in Figure 3, the conductor 4', which is made by combining the horizontal members 6' and 7' in a polymerized state with an insulating material (not shown), is positioned in a polymerized state. An electrode end is arranged in a hanging manner below the conveyor side belt 3 at a position assumed to be 3, with the electrode end close to the upper surface side of the return belt 31.
If the A wiring and the B wiring are connected to the power source 5 (Fig. 4) and the conductor 4' is kept in a state where current is constantly applied during the operation of the belt conveyor, longitudinal cracks will occur in the belt 3, and the longitudinal cracks will be prevented. The ore that falls onto the return belt 31 from above causes a short circuit between the positive and negative electrodes that constitute the conductor 4', and this can be detected by the current value of the ammeter 8 to detect vertical tearing of the belt. .

The distance between the wire rods 6 and 7 (first extreme) of both electrodes in the conductors 4 and 4' is determined by the grain size of the ore to be conveyed, and is approximately 2 to 3 m in the case of fine ore and 5 to 10 m in the case of concentrate. It is preferable that

In the above explanation, the conductors shown in FIGS. 2 and 4 are used individually, but this does not preclude the use of both in combination if necessary, and the structure of the conductor is not limited to the one described above. Design changes can be made without departing from the gist of the invention.

The method of the present invention described above has the problem that it cannot be detected unless the ore falls from the belt during conveyance because it is indirect with respect to the belt. By installing a belt, most of the accidents can be detected, a low current is enough to apply, it is technically very simple, easy to inspect and maintain, and it is low cost. It can deal with most accidents where vertical tearing or partial damage occurs.

[Brief explanation of the drawing]

Each of the figures shows an embodiment of the present invention; FIGS. 1 and 3 are schematic diagrams showing embodiments, and FIGS. 2 and 4 are explanatory diagrams schematically showing details of a conductor. In the figure, 1: belt conveyor, 2: hopper, 3: conveyance belt, 3. : Return side belt, 4, 4': Conductor, 5
: Power supply, 6, 7 two wires, 6',? ': Cross member, 8: Ammeter.

Claims (1)

[Claims] 1. One or more sets of conductors, each consisting of an alternate combination of positive electrodes and negative electrodes made by joining a large number of parallel wires in a comb-like shape, are installed at a desired position between the conveyance side and return side belts of a belt conveyor, and the belt A belt conveyor characterized in that the conductor is maintained in a current applied state at all times during conveyor operation, and the positive electrode and the negative electrode are short-circuited by falling ore from the cut portion of the belt, and the current or voltage flowing through the conductor is detected. belt breakage detection method.