JPH0144490Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conveyor system, and more particularly to a conveyor system equipped with a chain break detector used in the conveyor system.

Conventionally, safety relays have been used as safety devices to prevent chain breakage in conveyor equipment, which detects the motor current of the drive source and stops the motor when a load above a certain value is applied for a set time.
Also, a shear pin type safety device is used which prevents the chain wrapped around the sprocket from breaking by shearing the pin of the driving roller chain when a torque exceeding a certain value is applied to the sprocket. However, these are preventive safety devices for chain breakage, not chain breakage detection devices.

Therefore, chain breakage due to overload is
By adopting the above-mentioned safety devices, this purpose can be achieved to some extent, but it is important to note that conveyor chain failures occur not only due to overload, but also due to fatigue failure due to repeated constant loads. There are many.

Of course, it would be fine to always use the load below the endurance limit without causing fatigue failure, but this would increase the safety factor and make the dimensions of each part larger than necessary, so it is not necessarily a good idea. I can not say.

The object of the present invention is to provide a conveyor that is as compact and lightweight as possible and has a large capacity. Therefore, the conveyor chain is inevitably strained, but before a major accident occurs, in other words, if a part of the chain first breaks due to fatigue, the large impact noise caused by the fatigue failure can be detected. The idea is to stop the conveyor operation at this stage.

When a chain suffers fatigue failure, not only when it is used in multiple strands, but even in the case of a single strand, the plates on both sides of the same link do not always break at the same time, resulting in a major accident. It is. Therefore, if the operation is stopped at the first fatigue failure, repairs can be easily made without incurring major damage due to a major accident.

In addition, chains are often used in corrosive or abrasive environments, and even if they are initially strong enough, the material may deteriorate or deteriorate over long periods of use. Because the original strength of the chain cannot be maintained due to wear and tear, there is a good chance that the chain will break even if there is no overload.

The conveyor device according to the present invention is equipped with a detection device for detecting impact noise generated by the above-mentioned fatigue fracture and the like.

Hereinafter, one embodiment of the conveyor device according to the present invention will be described in detail by taking a bucket elevator as an example.

Although Fig. 1 shows the upper part of the bucket elevator, the bucket elevator main body is not unique in any way; a chain 13 with a bucket 12 attached thereto is wound around sprockets 11, 11 arranged above and below. The powder and the like that have been hung and placed in the bucket 12 are discharged from the opening 15 of the case 14 by the movement of the chain 13.

The conveyor according to the present invention is equipped with a detection section for detecting impact noise, and is attached near the upper sprocket 11 in the case of a bucket elevator.

Generally, the tension in the chain 13 is greatest where it is applied to the drive sprocket 11 on the transportation side, so when the chain 13 breaks, it very often occurs near the sprocket 11 mentioned above. Therefore, in a bucket elevator, the upper sprocket 11 is the driving side, and it is most effective to mount the detection section 1 near the sprocket 11.

By the way, the detection unit 1 is attached to the case 14 via the attachment plate 16 as shown in FIG.
The detection unit 1 is protected by a protective cover 17 and is connected to the operation room via a cable 18.
Therefore, when the impact sound entering from the detection unit 1, generally a microphone, exceeds a certain level, the output unit displays a red lamp, issues an alarm, etc., and stops the conveyor operation.

In other words, the impact sound from the detection unit 1 is detected by the sound level meter.
Enters the voltage comparator as the DC output voltage. The voltage comparator is preset to a constant voltage, and if a voltage exceeding that voltage is input from the sound level meter,
An alarm etc. will be issued.

In this way, when used in a sealed case 14 like a bucket elevator, the chain breakage sound propagates inside the case 14, so the detection unit 1 is installed at one location near the drive sprocket 11 as described above. A microphone with negligible tropism is suitable as the detection unit 1 because it can easily catch sound.

On the other hand, if the length of the conveyor is long, this can be dealt with by increasing the number of detection units.

Also, as for the sound of conveyor equipment, chain 13
There are many noises such as the meshing noise between the sprocket 11 and the sprocket 11, the driving noise of the motor and reducer, the bending noise of the chain 13, the contact noise between the chain 13 and the guide rail, the noise generated by the conveyed object, the vibration noise of the case and frame, etc. Although the sounds are mixed, it is possible to detect the impact sound caused by the breakage of the chain 13, which is much louder than the above sounds, but in order to further improve the reliability of detection, a voice recognition device can be used. be able to.

As described above, the conveyor device according to the present invention is equipped with a detection section that detects the impact sound generated from the chain breakage, and the conveyor detects the impact sound and automatically or automatically detects the impact sound. Conveyor operation can be stopped manually by an alarm, etc. issued via the conveyor.

This detection is different from overload detection, and is different from overload detection.
This is a detection based on partial failure, and is a signal that the conveyor must absolutely stop, and its importance is completely different from the signal issued from overload detection.

Repeating overload detection several times can lead to chain breakage, so it is absolutely necessary for conveyor equipment to have a device that detects chain breakage.The action of this device can prevent major accidents in conveyor equipment from occurring. It can be prevented.

[Brief explanation of drawings]

Fig. 1 shows an example of the conveyor device according to the present invention, in which a detection device is attached to a bucket elevator, and Fig. 2 shows an example of the detection device attached to a bucket elevator.
The figure is a block diagram of the detection device. 1...detection section, 11...sprocket, 12...
...Bucket, 13...Chain, 14...Case, 15...Exit, 16...Mounting plate, 17...Protection cover, 18...Cable.

Claims (1)

[Claims for Utility Model Registration] (1) A conveyor device consisting of a conveyor chain wound around a sprocket is provided with a detection device for detecting an impact sound caused by a break in the conveyor chain, and the detection device detects the impact noise. The detection part for detecting and the impact sound from the detection part
A sound level meter that converts to DC voltage and outputs it, a voltage comparator that compares a preset voltage with the voltage input from the sound level meter, and an alarm or indicator lamp that activates when the input voltage exceeds the set voltage, etc. A conveyor device equipped with a chain break detector, characterized in that it is comprised of: (2) A conveyor device equipped with a chain breakage detector according to claim 1, which is configured to control a drive motor instead of activating the alarm. (3) The above-mentioned detection device includes a storage device that stores the waveform of the impact sound caused by the chain breakage, a detection section that detects the impact sound, and a combination of the waveform from the detection section and the waveform stored in the storage device. A conveyor device equipped with a chain breakage detector as set forth in claim 1 or 2 of the utility model registration claim, comprising a voice recognition device for comparing and classifying.