DE2455814A1 - VIBRATION MEASURING AND DISPLAY DEVICE, IN PARTICULAR FOR MONITORING MACHINERY AND EQUIPMENT IN UNDERGROUND MINING - Google Patents

Description

PATENT ADVERTISER BODE · 4033 HOSEL. PO Box 1140 TELEPHONE 02102-60001 TELEX 8585166

N 5-27.

COAL INDUSTRY (PATENTS) LIMITED Hobart House, Grosvenor Place, London SWlX 7AE,

England

Vibration measuring and display device, in particular for Monitoring of machines and devices in underground mining

The invention relates to a vibration measuring and display device, especially for monitoring machines and devices in underground mining. However, the invention is not limited to this particular use, but is intended for display in many other areas as well and monitoring the vibration of machines and devices.

One of the difficulties encountered in maintaining and monitoring machines and equipment is how to manage them to be reached if they are installed at a greater distance. To keep the machines and equipment under good Working conditions have to be made periodically Inspections are carried out to ensure that there is no excessive wear on the moving parts, which can lead to malfunctions or damage, as a result of which fires could occur or other devices and facilities can be damaged. In particular for machines with rotating parts, the condition of the Bearings in the machines are checked regularly. If this check is to be carried out visually,

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the machine must be switched off for a certain period of time during the check. The more inaccessible the machine or their location, the more time the inspections need, which is associated with a significant loss of production can be·

It is therefore an object of the invention to provide an automatic remote display device to create the frequent visual inspections which makes machines and devices superfluous and which is also so robust that it can handle the. destructive environmental conditions withstands, for example, found in mines or in many heavy industry plants are.

The vibration measuring and indicating device according to the invention is provided with a transducer attached to a machine or device, has a circuit, which receives electrical signals from the transducer and generates a signal level proportional to the vibration of the machine is, and finally has a display device, the deviations of the electrical signals from a predetermined Indicates signal level.

The display device is preferably designed so that an alarm is given when the measured by the transducer Vibrations become excessively strong; however, it can also give an alarm or other suitable indication, when the vibrations become weaker or fail completely. These indications can be acoustic or optical or combined be given acoustically and optically.

The circuit may include an integrator capable of causing transient excessive vibrations smooth and the useless operation of the display device

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PATENT ADVERTISER BODE · 4033 HÖSEL. BOX 1140. TELEPHONE 02102-60001 TELEX 8585166

to prevent. The circuit can still be transistor operated Have relays. · -; ■

The transducer can have a certain mass in order to have a spatial reference. -

For a better understanding of the invention, an exemplary embodiment is provided a vibration measuring and display device according to the invention in the following with reference to the accompanying block diagram explained.

In this embodiment, the vibration measuring and display device is used for monitoring the vibrations of a pit ventilator used in a mine.

A variable reluctance and mass acoustic vibration transducer is via a rod which has one end attached to the diaphragm or fitting of the transducer and the other end attached to the Fan is attached, so connected to the fan that it is operated by the vibrations of the fan. Of the Transducer is in the. Attached near the bearings of the fan. In the block diagram, the transducer is denoted by designated. The movement of its mass induces electrical signals which are passed on to an amplifier 2. This amplifier 2 is a conventional transistorized voltage amplifier and is used to measure the signal level of the transducer 1 to lift. The output of the amplifier 2 is input to a converter 3. Be in the converter the AC signals of the amplifier 2 are rectified and then pass through an integrator with a parallel capacitor and resistance and a variable time constant to

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PATENTANWALT BODE · 4033 HÖSEL ■ POST BOX 1140 · TELEPHONE 02102-60001 · TELEX 8585166

Generate an average direct current signal over an adjustable short period of time. Using this Integrator allows the measuring and display device to ignore occasionally occurring oversized pulses, if for any reason these are supplied by the fan.

The output of the converter is fed into a discriminator 4, where switching takes place through the direct current signal. The DC signal is used ₃ by feeding it into the base circuits of a pair of complementary transistors, each of which is statically biased towards its conductive side. These transistors are therefore conductive when normal vibrations are present, which means that _s the collector currents of the two transistors are maintained at a level sufficient to excite two associated relay. These relays are connected to an alarm lamp 5 and a stop circuit with lamp 6. Another lamp 7 is built in to indicate when the system is running normally.

In use, the vibrations of the fan at the output of the transducer 1 produce a general signal level sufficient to to energize both relays of the discriminator U. This causes the lamp 7 to light up, but not the lamps 5 and When the vibration of the fan increases, the signal level of the output signal of the transducer increases accordingly, whereby one of the transistors turns off and the associated relay drops out, causing an alarm condition to occur and the Alarm lamp 5 lights up. An acoustic warning signal can be connected to this lamp 5. A drop in the signal level of the transducer 1, either by the absence of

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PATENTANWALT BODE 4033 HGSEL -POSTBOX 1740 TELEPHONE 02102-60001 TELEX 8585166

Vibrations on the fan or due to a fault in a component may be caused, causes the other transistor switches off, as a result of which the associated relay drops out and any control device is triggered, as well as the Lamp 6. Here, too, an acoustic warning signal can be connected to the lamp 6 again.

The device can be continuously monitored by a siren 8, which is fed from the amplifier 2 via a low-frequency amplifier 9, if this is required. ■ ^e

With the invention, the fan can be monitored continuously and no longer needs to be switched off for regular inspections. If any errors occur, which lead to a strong vibration of the fan, this is indicated immediately and appropriate steps to be taken to remedy the situation can be initiated.

The transducer itself is very stable and can also be used under unfavorable conditions. Since he is only a few Has parts, it is also very reliable.

Batent claims:

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Claims (4)

PATENT ADVERTISER BODE · 4033 HOSEL. PO Box 1140 TELEPHONE 02102-60001. TELEX 8585166 N 5 - 27 - 6 -. Patent claims: 1. j vibration measuring and display device, in particular, for monitoring machines and devices in underground mining, with a transducer on the machine or the device that emits an output signal proportional to the vibration level to a circuit, characterized in that the circuit has an integrator (3), which is arranged to receive the output signal of the measuring transducer, and a display device (5,6,7) which displays the vibration level relative to a predetermined level. 2. Vibration measuring and display device according to claim 1, characterized in that the circuit has a discriminator (4) which receives the output signal of the integrator (3) and a relay for controlling the display device (5,6,7) is actuated. 3. Vibration measuring and display device according to claim 2, characterized in that the Relay is transistor controlled. 4. Vibration measuring and display device according to one of the Claims' 1 -3, characterized in that that the display device (5,6,7) an optical signal, an acoustic signal or a combination emits both signals. 098 23/0654 PATENT ADVERTISER BODE ■ 4033 HÖSEL. PO Box 1140 TELEPHONE 02102-60001. TELEX 8585166 5, vibration measuring and display device according to one of claims l-4, geken nz eich.net through additional display elements (8,9) which indicate the operation of the vibration measuring and display device. II / BO 509823/0654 Blank page