JPS617127A - Longitudinal crack detector for conveyor belt - Google Patents

Abstract

PURPOSE:To make accurate longitudinal crack detection with no wrong operation performable, by detecting a longitudinal crack in a belt with the best use of induced electromotive force to be produced in a detection coil at a time when a conductor loop embedded in the belt passes through the inside of the detection coil surrounding the belt. CONSTITUTION:In case of a conveyor 5, which nippingly presses a strip belt 1 with plural pincers-press rollers 2 disposed in annular form whereby both side parts 3 in the width direction are deformed into the cylindrical form superposed with each other, and conveys a lot of conveyed goods 4, a conductive material 61 extending in the width direction is embedded in the belt 1 at regular intervals along a longitudinal direction. The conductive material 61 is exposed to the belt surface at each side part 3, coming into contact with each other at the superposed part between both side parts 3 and 3 of the belt. And, a detection coil 7 is installed to surround a cylindrical belt part of the conveyor 5 at regular intervals, whereby a longitudinal crack in the belt 1 is detected in a way of whether induced electromotive force is produced or not when the conductive material 61 passes through with the progress of the belt 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a conveyor for transporting powder and granular materials by using a plurality of clamping pressure rollers to move a belt in the form of a cylindrical ft x pipe. (hereinafter referred to as pipe conveyor)
It is related to #/C, and in particular, quantum filters are used in devices that detect longitudinal cracks in belts on pipe conveyors.

The Wataru C blow pipe conveyor is capable of conveying powder and granules at a larger angle of inclination than a normal nine-belt conveyor.

By the way, in general, in belt conveyors, objects to be transported or foreign substances mixed in the objects to be transported may be removed from the conveyor while the conveyor is operating.
When the belt pierces and gets caught, the belt can tear over a long distance π in the longitudinal direction, resulting in a so-called vertical tear, and this is no exception for the Evive Conpei.

For this reason, in a normal trough belt conveyor,
Conventionally, various longitudinal crack detection devices have been proposed, for example,
A conductive material in the form of a straight line or loop is buried in the width direction of the belt for each prisoner for a certain length of the belt, and a conductive material is buried in the belt width direction on both sides of the belt, near the ears, and there is a gap between the belt and the belt. , a transmitting member and a receiving member are placed respectively, and a signal is transmitted using electromagnetic inductive coupling between these members and the conductive material. In this longitudinal crack detection device, when a longitudinal crack occurs in the belt, the conductive material buried in this portion is cut, causing a change in the transmitted signal. Therefore, the belt is automatically stopped by detecting a change in the signal.

Problems to be Solved by the Invention However, in the above-mentioned conventional detection device, the method of embedding a linear conductive material in the width direction of the belt and utilizing capacitance coupling causes the flapping of the four belts, causing the belt and sensor (transmission/reception) to be disconnected. The disadvantage is that there are many false alarms because the distance between the belt and the belt member is unstable, so the method that uses electromagnetic induction coupling by burying a loop-shaped conductive material is a method that embeds the conductive material inside the belt with high precision. In addition, the durability and fatigue properties of the conductive material in the curved portion of the loop were poor.

Furthermore, such a conventional detection device cannot be used for a pipe conveyor in which both sides of the belt overlap each other.

Means and operation for solving the problem Therefore, the invention is 1- To eliminate the drawbacks of the conventional device described above and to provide an electromagnetic inductive coupling type vertical crack detection device that takes into account the special characteristics of pipe conveyors. For this reason, in the present invention, as shown in the accompanying drawings, a belt-shaped belt 1 is clamped by a plurality of clamping pressure rollers 2 arranged in a circumferential manner so that both sides in the width direction of the belt can be compressed. A conveyor (pipe conveyor) 5 for transporting objects 4 into a cylindrical shape in which 3 are superimposed with each other.
In the front penetrating bell), conductive material 6 extending in the width direction of LiC is buried at constant intervals VC along the longitudinal direction. This conductive material 6 is a belt 1σ) on both sides J'f! J
Exposed on the vent surface at X3,3 1. As described above, the loops of the conductive material 6 are made so that when they are formed into a cylindrical shape, the exposed portions overlap and touch each other. Formation, right?
, and a detection coil 7 that surrounds the outer periphery of the belt 1 while keeping it open from the belt is provided in the cylindrical portion of the conveyor 5, and the detection coil 7 and the conductive In the apparatus of the present invention configured in this way, the belt [V
When no longitudinal cracks occur, the conductive material 6 forming a closed loop of conductor passes through the detection coil 7 as the belt 1 advances, so an induced electromotive force is generated in the detection filter 7. . However, when a belt tear occurs, the conductive material 6 is also cut by the longitudinal tear and the closed loop is opened, so that no induced electromotive force is generated in the detection coil 7 even when the conductive material 6 passes through. Therefore, longitudinal tearing of the belt 1 can be detected by the non-generation of the induced electromotive force.

EXAMPLE Hereinafter, an example of the invention will be described with reference to FIGS.

Figure @3 is a schematic perspective view showing the entire pipe conveyor 5 equipped with a longitudinal crack detection device according to the present invention, in which an endless belt t is
It is stretched between a plurality of pulleys 8 and a plurality of pairs of clamp pressure rollers 2. A plurality of clamping pressure rollers 2 are arranged in a circumferential manner in a plane perpendicular to the traveling direction of the belt 1 in each pair. The cylindrical shape 1c is curved by these clamping rollers except for the vicinity of the belt-roe-bouri 8, and as shown in FIG. 2, both sides 3.3 are overlapped with each other. The transported object 4, such as powder or water-containing mud, is conveyed while being held in the cylindrical curved bell I as described above, so that it does not fall off the conveyor during conveyance. In addition, compared to ordinary belt conveyors, it is possible to perform vertically inclined conveyance with a larger loading cross-sectional area.Furthermore, the installation width is narrow compared to the amount of transport, and the conveyor can be curved. You can also set it up.

As shown in Figure 1, the bell) l has a core body 9 made of canvas or steel cord in the center, and the outer and inner surfaces of the core body 9 are covered with an outer cover 10 made of rubber or the like and a bar 11 on the inner surface. 1 inside the outer cover.
From a book or a plurality of electric wires, for example, 1 [filter conductive material 6
I is buried.

This conductive material6. &'f extends over the entire width of the belt 1, and both ends thereof are covered with conductive rubber 62. .

63. This conductive rubber 62% 63 is a conductive material 6. made of the electric wire. Together with this, an integral conductive material 6 is formed. The conductive rubber 62, 63 is exposed on the outer surface J2 and the inner surface 13 of the belt 1 as shown.

This belt (is pressed by the clamping pressure roller 2 and becomes cylindrical as shown in FIG. 2. At this time, the conductive rubber 62
and 6. are overlapping and in contact with each other, and the conductive material 6+
, 62-6s are closed in an annular manner to form a conductor loop.

The conductive material 6 (conductive material 6. and conductive rubber 6)
□, 63)&X, provided at regular intervals in the longitudinal direction of the belt 1. The pipe conveyor 5 is provided with a detection coil 7 that surrounds the outer periphery of the cylindrical belt 1 at a distance from the belt 1.
- The conductive material 6 buried at regular intervals in the longitudinal direction of the tVC and closed to form a T loop passes through the detection coil 7 one after another as the belt advances, and each time If an induced electromotive force is generated in the detection coil, this induced electromotive force is amplified and detected in the control device 14, and if the detection signal is generated regularly as the belt progresses, it is determined that there is a longitudinal crack in the belt 1. If you don't, you'll be judged 〇 Belt [VC
When a longitudinal crack occurs, the conductive material in that area6. Since the conductive material 6. is cut, no loop of the conductor is formed and the conductive material 6. When passing, no induced electromotive force is generated in the detection coil 7. Therefore, when the induced electromotive force detection signal becomes irregular, the control device 14 senses this and issues a longitudinal crack detection signal, and this signal indicates the occurrence of a longitudinal crack on the display device. , the belt will automatically stop.

In the above embodiment, the conductive material 6 is embedded in the outer cover 10 of the belt 1;
Needless to say, it may be buried on the side. Further, in the above embodiment, the detection coil 7 is provided in the upper traveling portion of the funnel, but it may be provided in the lower traveling portion or the &senryo portion, respectively. Many variations are possible within the scope of the invention; however, in accordance with the invention, detection is achieved by passing a conductor loop embedded in the belt through a detection fill surrounding the belt. Since longitudinal cracks in the belt are detected using the induced electromotive force generated in the coil, there is no possibility of false alarms occurring due to fluctuations in the distance between the detection unit and the belt due to belt flapping.

In addition, the conductive material to be buried in the belt (a simple shape with a line-shaped surface can be used, so it is easier to bury the conductive material than a loop-shaped conductive material), and the conductive material σ
It is also advantageous in terms of durability, fatigue resistance, etc.

Furthermore, the conductor loop in the invention is formed by bending the belt into a cylindrical shape by a clamping pressure roller, and is compatible with the special characteristics of a pipe conveyor. It has particularly excellent effects.

[Brief explanation of drawings]

The drawings show an embodiment of the invention; FIG. 1 is a cross-sectional view of a belt, FIG. 2 is a cross-sectional view of a belt bent into a cylindrical shape by a clamping roller, and FIG. It is an overall perspective view. t... Belt, 2... Clamping roller, 3... Side part, 4... Transported object, 5... Conveyor, 6... Conductive material, 7 ...Detection coil, 8...Pulley, 9...
Core body, 10...Outer surface, 211...Inner cover, 12...Outer surface, 13.Inner surface, I4...Control device.

Claims (1)

[Claims] In a conveyor that transports goods by clamping a belt-shaped belt with a plurality of clamping pressure rollers arranged circumferentially to form a cylindrical shape in which both sides in the width direction overlap each other,
A conductive material extending in the width direction is buried in the belt at regular intervals along the longitudinal direction, and when the belt is made into a cylindrical shape, both ends of the conductive material come into contact to form a conductor loop. The conductive material is exposed on the belt surface at both sides of the belt, and the outer periphery of the cylindrical belt is surrounded at a distance from the belt to form an electromagnetic inductive coupling with the conductive loop. A conveyor belt longitudinal tear detection device characterized by being provided with a detection coil that detects longitudinal cracks in a conveyor belt.