SU1368528A1 - Safety friction coupling signalling device - Google Patents

Description

The invention relates to mechanical engineering, in particular, to agricultural mechanical engineering, and is intended to protect the friction elements of the agricultural iman from failures by signaling overloading of the power I drive.

The purpose of the invention is to increase the reliability of the coupling.

Supplying the alarm device with an auxiliary control element and making a thermosensitive element in the form of a shunt made of a thermomagnetic material provide a clear distinction between the signals indicating the normal operation of the friction safety clutch and the signals indicating its thermal overload, which makes it possible to temporarily disconnect the coupling and increase the reliability of her work.

The drawing shows the device alarm thermal overload of the friction safety clutch

The device is placed on the safety coupling and on the base. The safety clutch consists of a leading coupling half 1, a driven coupling half 2, a package of friction discs 3, a disc spring 4, which abuts against a retaining ring 5 and an adjusting sleeve 6, compresses the package of disks 3 through a pressure disk 7 connected by a thread 1m with connection 6 to the sleeve.

On the lip 8, filled on the leading half coupling 1 and located opposite

the periphery of the package of friction discs 3, the control element of the device is fixed, made in the form of a thermomagnetic shunt 9, pole pieces 10 made of a magnetically soft material and a permanent magnet 11. An additional diameter is opposite to the main control element on the housing of the leading half coupling 1. a control element consisting of a non-magnetic gasket 12 and a permanent magnet 13. Outside the coupling, it is fixedly mounted to interact with both control elements of the control element bd member 14 vtolnenny in a sealed sensor, e.g.

reed switch connected to the input of the block 15 alarm.

The device works as follows.

In the absence of an overload in the drive, both the coupling halves 1 and 2 of the friction clutch rotate synchronously without mutual slippage. In this case, the temperature of the thermomagnetic shunt 9 is equal to the ambient temperature and the entire magnetic flux of the permanent magnet 11 is closed through the shunt 9 and does not affect the reed switch 14. The field of the permanent magnet 13 of the additional control element affects the reed switch 14 made him

0 plugging and stretching at the frequency of rotation of the coupling half 1. Signals are received at the input of the alarm unit 15 at a frequency corresponding to the rotation frequency of the coupling half 1

5 If an overload occurs

the safety clutch engages, driven by the half coupling 2 begins to slip relative to the leading coupling half 1. The work of the axle box turns into heat, warming the coupling elements. When the casing of the leading half coupling 1 reaches the maximum permissible temperature, which corresponds to the Curie point of the chosen material of the thermomagnetic shunt 9, the latter loses the magnetic conductivity property and ceases to shunt the magnetic flux of the permanent magnet 11, which due to

0 this starts to affect the reed switch 14. In this case, the reed switch 14 starts to operate twice in one turn of the leading crawler 1, and the signaling unit 15 receives a signal

5 with double frequency in relation to the frequency of rotation of the leading coupling half 1, operating without slipping. At the time of occurrence of signals with a double frequency safety

The Q friction clutch is turned off. The timely shutdown of the safety clutch allows the friction surfaces of its discs to be maintained in a condition that ensures reliable operation of the clutch. With

This extends the service life of the friction discs.

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Claims (1)

SIGNALING DEVICE FOR SAFETY · FRICTION CLUTCH, containing base, control and controlled elements, control element is made with a permanent magnet and heat-sensitive element and mounted on the drive coupling half of the safety coupling, and the controlled element is made in the form of a sealed magnetically controlled sensor and is fixedly mounted on the base from the base the possibility of interaction with the control element, characterized in that, in order to increase the reliability of the coupling, it is equipped with with a permanent control element with a permanent magnet and a non-magnetic gasket, the thermosensitive element is made in the form of a shunt of thermomagnetic material and is placed between the housing of the drive coupling half and the permanent magnet of the main control element, and an additional control element is mounted on the housing of the drive coupling half diametrically opposite to the main one, the non-magnetic gasket being placed between the housing of the driving coupling half and the permanent magnet up to 9 (L with an additional control element. □ about joint venture 1368526