SU863451A2 - Device for automatic detection of overheated axle boxes of railway rolling stock - Google Patents

Description

(54) AUTOMATIC DETECTION METHOD FOR OVERHEATED TOWN MOBILE STRUCTURE

The invention relates to transport and can be used in automation equipment designed to detect emergency boxes in passing trains.

According to the main author. St. No. 432029 an automatic detection device is known. overheated axle boxes of rolling stock used in railway transport. This device contains track reading chambers, wheelset aisle sensors, amplifiers, threshold elements, control units and amplitude memory of 10 heat signals of two car axle boxes, as well as amplitude discriminator, amplifier inverter with a calculated gain factor and adder, and two totalizer inputs and the amplitude discriminator is connected in parallel to the outputs of the memory block of the amplitudes of the thermal signals of two boxes, the output of the amplitude discriminator is connected to the input of the inverter amplifier, the output of which is connected to tr emu sumatora entry whose output is connected to the house vho- JQ threshold element 1.

The reliability of recognizing overheated books in a known device depends on the outdoor temperature. A change in air temperature causes a detuning of the receiving and amplifying path of the device, as a result of which the readings of the latter cannot be used for the correct detection of overheated axle boxes, which leads to a decrease in traffic safety. To restore the normal operation of the device, it is necessary to set it up manually; it is associated with the departure of the attendants to the location of the floor equipment.

The aim of the invention is to increase the reliability of recognition of overheated boxes when the outside temperature changes.

The goal is achieved by the fact that in the automatic detection unit of superheated rolling stock between the preamplifier, located in the reading chamber, and the amplifier, a signal temperature correction unit is included, consisting of a variable gain amplifier, a buffer amplifier, subtractive units, and a determinant module, In this case, amplifier inputs are connected in parallel to the preamplifier output, and a variable gain amplifier output is connected to one of the inputs subtracting blocks buffer amplifier output connected to another input of one of them, the output of which is connected via a determinant modulation with the other input of another subtractor unit.

FIG. 1 shows a block diagram of the device; in fig. 2 - signal temperature correction block.

The device contains a traveling reading camera 1 with an infrared radiation receiver and a pre-amplifier, an amplifier 2 connected to memory block 3, a control block 4 to which wheel pair sensors 5-8 are connected, an amplitude discriminator 9 and an adder 10, an inverter 11 and a threshold element 12; Between the output of the preamplifier of the traveling chamber 1 and the amplifier 2 a block 13 of temperature correction of the signal is turned on, which contains the amplifier 14 with a variable gain otKi, linearly dependent on the external temperature air, a buffer amplifier 15 to the transmission coefficient Cg, the subtracting unit 16 with a transmission ratio equal to 1, the determinant module 17 Rs transfer coefficient and the subtracting unit 18 with a transmission ratio equal to 1.

The device works as follows.

The input of block 13 receives the pulses UBX from the output of the preamplifier, which in the form of voltages UBX-oCKi from the output of amplifier 14 and the output of the buffer amplifier 15 is fed to the inputs of block 16, the output of which is formed by their voltage pulses U out i. proportional to the algebraic difference of the incoming signals;

 (oiK.-K2),

i is the coefficient that is directly dependent on air temperature; K, is a constant coefficient. The pulse from the output of the subtracting unit 16 is fed to the input of the determinant module 17, from the output of which the voltage pulse

 UBX (odKi-Kj)

and

yyhg

arrives at one of the inputs of block 18, and at the other - a voltage pulse from the output of amplifier 14.

The output of block 18 will be a voltage pulse equal to

Uebi) (3 (dKi - Kg - “iKijX

KS) KA, where K4 oiK.-UKi-Kal-K; which is fed to the input of the amplifier device.

Thus, the automatic correction of the heat signal in the receiving-amplifying path of the device is carried out depending on the outdoor temperature.

By introducing a temperature correction unit of the receiver amplifying tract, the device can significantly improve the accuracy, reliability of operation and accuracy of recognition of overheated axle boxes, thereby increasing the traffic safety of trains. In addition, by eliminating manual adjustments, the time for a simple device is reduced, the overhead costs of operating personnel are significantly reduced due to traveling to adjust the device when the outside air temperature changes.

Claims (1)

Invention Formula The device for automatic detection of superheated axle boxes of the rolling stock according to ed. St. No. 432029, characterized in that, in order to increase the reliability of recognition of overheated axle boxes when the outside air temperature changes, between the preamplifier located in the reading chamber and the amplifier a signal temperature correction unit is included, consisting of a variable gain amplifier, a buffer amplifier, subtracting units and a module determinator; in this case, the amplifier inputs are connected in parallel to the output of the preamplifier, and the output of the amplifier with a variable gain is connected to one input of the subtracting unit, an output of the buffer amplifier is connected to another input of one of them, the output of which is connected via a determinant modulation with the other input of another subtractor unit. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 432029, cl. In 61 K 9/06, 1971. (puz.Z