JPS58220012A - Longitudinal crack detecting device for conveyor belt - Google Patents

Abstract

PURPOSE:To improve the durability of a belt while eliminating wire connecting parts by constructing a resonance circuit with a coil obtained by spirally rolling a conductor, a spiral condenser and a lead wire in a device where the resonance circuit for detecting longitudinal crack is burried within the cover rubber of a conveyor blet. CONSTITUTION:A coil 2 obtained by spirally rolling a lead wire 8, and a spiral condenser 8 are respectively burried in parallel within a cover rubber and also inside the end edge in the width direction of cover rubber (not illustrated) which is piled on the insulating rubber 7 of a conveyor belt 1. These coil 2 and spiral condenser 9 are connected with each other via a plurality of corrugated lead wires 4 arranged in parallel along the belt 1 width direction X, and a resonance circuit 5 for longitudinal crack detection is constituted by these coil 2, spiral condenser 9, and lead wires 4. This resonance circuit 5 is constructed by rolling in a form of arranged two pieces both ends of the conductors 8 of lead wires 4, each wound as a coil 2 so as, to form the spiral condenser 9.

Description

[Detailed Description of the Invention] The present invention relates to a vertical conveyor belt horizontal delivery device;
More specifically, if a vertical tear occurs on the conveyor belt, it will automatically detect this, stop the conveyor belt, and issue an alarm, thereby preventing damage to the conveyor belt to a minimum of 1ljI and improving work safety. The present invention relates to a vertical detection device.

Conventionally, as this type of vertical detection device, for example, the first
As shown in the figure, a coil 2, a mica capacitor 3, and a lead wire 4 are continuously buried in a conveyor belt cover comb (front U shown in the figure).
#c vibration circuit 5 for horizontal cracking of the conveyor belt 1 is tIIg, and when a vertical crack occurs in a part of the conveyor belt 1 and the resonant circuit 5 is disconnected, a phenomenon in which the resonance frequency changes is detected and the conveyor belt 1 is The conveyor belt was stopped and an alarm was issued in order to minimize damage to the conveyor bell (1).

However, with such a conventional vertical cleft lateralization device,
Since the mica capacitor 3 has a structure in which the capacitor element is coated with phenol resin, epoxy resin, etc., the thickness is 4 mm or more, and in order to bury the entire resonant circuit 5,
The thickness of the cover rubber was required to be 6 mm or more.

Also mica capacitor 3. Coil 2. The lead wire 4 is manufactured separately, and its terminals are later connected to form a loop-shaped resonant circuit 5. In particular, the connection portion 6 between the lead wire 4 and the mica capacitor 3 is made from other parts. The disadvantage of being less flexible compared to .

In FIG. 1, 7 indicates insulating rubber and 8 indicates a conducting wire.

This invention was devised by focusing on the N point, and its purpose is to reduce the thickness of the connecting part of the capacitor part that constitutes the resonant circuit, and to By configuring a resonant circuit without a reading section, damage to the conveyor belt can be minimized! The present invention provides a vertical tear detection attachment that not only prevents cracks from occurring, but also improves work safety.

In order to achieve the above object, this invention consists of a coil, a lead wire, and a capacitor embedded in the cover rubber of the conveyor belt to form a resonant circuit for detecting the vertical length of the conveyor belt (L, 2). In the lateral delivery device, a conducting wire is inserted inside the end of the conveyor belt in the width direction.
A coil made of IAef and an A-cane capacitor are buried in parallel, and a plurality of lead cottons are placed in the width direction of the conveyor belt from this coil and a spiral capacitor made of l1ff by resonating both terminals of this coil. The gist is that the resonant circuit for vertical II detection is made up of the coils, spiral capacitors, and a plurality of parallel lead wires arranged in parallel.

In addition, this invention provides that inside the widthwise end line of the conveyor belt,
A coil with a spiral lead wire is buried, and a conductor wire from this coil is meandered continuously in the width direction and longitudinal direction of the conveyor belt, and the number of lead fermenters arranged in this meandering manner is The gist of this invention is to construct a resonant circuit for detecting vertical cracks.

An embodiment of this invention will be described below based on five deceptive drawings.

Note that structural elements that are the same as those of the cane embodiment explained in FIG.

FIG. 2 is a plan view showing the first embodiment of the present invention. A coil 2 with an A-wound conductor 8 and a spiral capacitor 9 are buried in parallel inside a widthwise end of a cover rubber (not shown) superimposed on a rubber band 7.

From the coil 2 and the spiral capacitor 9, a plurality of lead wires 4 are arranged parallel to each other in a wavy shape toward the width direction X of the conveyor belt 1. The spiral capacitor 9 and the plurality of parallel leads 14 constitute a resonant circuit 5 for detecting vertical tears in the conveyor belt 1. The lead t14 is made of a high elongation steel cord with a diameter of about 1.0 to 1.5 mm, which is coated with nylon and bonded to rubber, and has a cutting elongation of 10% or more. It is used. In the production of the resonant circuit 5, which is customary as described above, both ends of the conductive wire 8 wound as the coil 2 are stretched as the lead wire 4 in the insulating rubber 7 with an appropriate distance apart, and are shaped into a waveform so as to withstand bending. After embedding the capacitors in the tube, they are rolled up in pairs to form a spiral capacitor 9.

In addition to being circular, the shape of the cane that can be wrapped around can also be oval or square.

The spiral capacitor 9 acts as a capacitor due to the capacitance between two adjacent conducting wires 8.8, and forms a resonant circuit 5 with the coil 2 (6). Furthermore, by adjusting the length of the omitted conductor 11B, the capacitance of the vortex capacitor 9 can be adjusted, and the unique resonant frequency of the resonant circuit 5 can be set.

Next, sugar diagram 3 shows the second embodiment of this invention.
0 indicates a linear capacitor. In this practical example, a conductor 8 is installed inside the end of the conveyor belt 1 in the width direction.
At the same time as burying the coil 2 which has been made into a coil,
The lead wires 4 are arranged in a continuous meandering manner in the width direction X1 and longitudinal direction Y of the conveyor belt 1 from both terminal parts of the conveyor belt 1. One number of lead wires 4 constitute a resonant circuit 5 for detecting vertical cracks. In the case of this embodiment as well, it is desirable to embed it in the corrugated belt so as to withstand stretching and bending during operation of the conveyor belt 1.

The linear capacitor 10 acts as a capacitor due to the capacitance of the two conductive wires 8.8 and forms a resonant circuit 5 with the coil 2.

By adjusting the length of the linear capacitor 10, the capacitance can be adjusted, and a resonance frequency specific to the resonance frequency m5 can be set.

In each of the above embodiments, the thickness of the capacitor 9 and 10 can be made equal to the thickness of the conductor 1B, and the resonant circuit 5 can be constructed from one continuous conductor 8.・Next, the relationship between the frequency and resonance voltage between the conventional resonant circuit 5 explained in FIG. 1 and the #, oscillating circuit 5 explained in FIG. 2, and the measurement results are shown in FIGS. 4 and 5. explain.

FIG. 4 shows the relationship between the frequency and the resonant voltage of the resonant circuit 5 using the vortex capacitor according to the present invention, and FIG. 5 shows the relationship between the frequency and the resonant voltage using the conventional mica capacitor 3. It is something.

Note that in the figure, a shows the measurement results when the resonant circuit 5 is not cut, and b shows the measurement results when the resonant circuit 5 is cut at the center of the lead wire 4.

Table 1 shows the conditions of the resonant circuit 5 used in this measurement.
... From this measurement result, even if a spiral capacitor is used, as with the case (9) when a mica capacitor is used, if the resonant circuit is not disconnected, it will reach 680K.
The resonance peak is shown at a frequency around Hz, and when the circuit is disconnected, the resonance peak changes significantly to the high frequency side. Therefore, the natural frequency (680KH in this measurement)
Vertical tears in the conveyor belt can be detected by detecting the level of the resonant voltage at z).

In addition, in the second embodiment shown in FIG.
A steel cord with a diameter of 1.05 mm (DX7 structure is used) is aligned with both ends and reciprocated twice in the width direction of the conveyor belt 1, and is embedded in the conveyor belt 1 to form a capacitor. The wave length on one side of this capacitor is 7 m, and the natural frequency at this time is ? 00kHz
becomes. When the capacitor part shown in Fig. 3 is destroyed due to a vertical tear in the conveyor belt, the frequency changes to 20 kHz.

Since the present invention is configured as described above, it has the following excellent effects.

(10) (1) Since the thickness of the connecting part of the capacitor part can be reduced to the same thickness as the lead wire thickness, a resonant circuit for detecting vertical cracks can be embedded in conveyor belts with thinner cover rubber than before. be able to.

(2) When buried in cover rubber of the same thickness, the thickness of the cover rubber on the resonant circuit increases, which has the effect of improving durability.

(3) In addition, by using the same conducting wire for the coil wire, lead I material, and capacitor wire, the resonant circuit can be formed with one continuous conducting wire, eliminating the connection of conducting wires with poor flexibility. This has the effect of improving the durability of the resonant circuit and also improving work safety.

[Brief explanation of drawings]

111th! ! 1 is an explanatory diagram of a conventional resonant circuit, FIG. 2 is an aR diagram of the resonant circuit of the present invention, and FIG.
FIGS. 4 and 5, which are explanatory diagrams of a resonant circuit showing an embodiment, are explanatory diagrams showing the relationship between frequency and resonant voltage between a conventional resonant circuit and the resonant circuit of the present invention. 1φ・Conveyor belt 2・・Coil 4・・Lead wire 5・・Resonant circuit 9・・Vortex capacitor No. 10・Wire cane capacitor agent Nobuo Ogawa, patent attorney - Patent attorney Noguchi Kido Teru Patent attorney Kazuhiko Aoshita Figure 1 Figure 4 Figure 5 Frequency

Claims (1)

[Claims] 1. A coil within the cover rubber of the conveyor belt. In a conveyor belt vertical detection device in which a lead wire and a capacitor are buried to form a resonant circuit for detecting a vertical conveyor belt, a coil having a conductive wire in a spiral shape is provided inside the widthwise end line of the conveyor belt. A spiral capacitor formed by inserting both ends of this coil into a coil is buried parallel to each other, and a plurality of parallel lead wires are connected from the coil and the spiral capacitor to each other in the width direction of the conveyor bell F. The vertical Ill? A conveyor belt vertical detection device characterized by a ten-dimensional resonant circuit for 11 outputs. 2. Coil inside the cover rubber of conveyor bell Y. In a conveyor belt vertical detection device in which a resonant circuit for detecting the vertical direction of a conveyor belt is formed by embedding a lead wire and a capacitor, a coil made of a spiral conductor is installed inside the end line in the width direction of the conveyor belt. At the same time, lead wires from this coil are meandered continuously in the width direction and length direction of the conveyor belt. A vertical conveyor belt detection device characterized by comprising a common IN circuit.