SU697362A2 - Anti-skid arrangement for electric rolling stock - Google Patents

Description

one

Basically auth. swith No. 588147 describes a device for the anti-slip protection of an electric rolling stock comprising frequency sensors connected via pulse counters, switches, a reversible counter and a comparison element with an actuator, which is equipped with a frequency switch to switch to increase the reliability of protection and sensitivity at different speeds.

The adhesion coefficient with increasing ciAipocTH movement of the locomotive varies according to a law other than linear. By a non-linear law, the dynamic component of axial loads also changes with increasing speeds of movement. These factors are decisive for the implementation of traction. Consequently, in order to obtain the limit values of the thrust force, it is necessary that the sensitivity of the anti-boxing device changes with an increase in the speed of the locomotive, according to the law, due to the laws of variation in the friction coefficient and the dynamic component of the axial loads for a particular tin locomotive. The well-known device on the main author. swith No. 588147 does not allow for changes in the sensitivity of the anti-blocking device other than directly proportional to the speed of the locomotive.

The purpose of the invention is to change the sensitivity of the device depending on the speed of movement.

This goal is achieved by the fact that the input of the frequency block in the proposed device is connected to the output of a reversible counter.

The drawing shows a schematic electrical block diagram of a device for anti-box protection.

The device consists of two counting circuits and a control circuit. In the general case, the number of counting chains is determined by the number of wheel pairs subject to blocking. Each counting circuit consists of a switch 1 and a counter 2 pulses connected in series. Switches 1 one of its inputs are connected to frequency sensors (not shown in the drawing). The element 3 of comparison is connected to the inputs of the counters of 2 pulses. These outputs of counters 2 369 are made at full capacity. To the other outputs of the counters 2, performed on a part of the tank, the logical element AND 4 is connected. Element 3 is comparable to reversible counter 5 connected to the executive body 6. The logical element AND 4 is also connected to the executive body 6. The device also contains the frequency block 7, the output which is connected to the switches 1. The input of the frequency block is connected to the output of the reversible counter 5. The circuit and structural implementation of the listed elements The block diagram of the device is as follows. Switch I is a disjunctor with two inputs, one of which receives impulses from the frequency sensor, and the other from frequency block 7, made in the form of a pulse generator with a time variable pulse frequency. There may be cases of temporal coincidence of pulses from the frequency dattack and the 7 o'clock block with a time-varying pulse frequency. In this case, at the output of switch 1, there is only one pulse. If, according to the accuracy conditions, this is simply not desirable, Switch 1 is executed according to one of the known schemes of temporary pulse separators. Pulse counter 2 is a common continuous device made on elements selected from economic considerations and operating in the corresponding code. The principle of operation of a pulse counter 2 is determined by its design and does not have any differences from the known counters, described in the literature. Comparison element 3 is the logical OR element, made according to a known scheme. Reversible counter 5 is a powerful one-shot with constant pulse duration. Structurally: the reversible counter 5 is made in the form of a successively connected low-power one-shot one-shot and power amplifier g ,,., „Executive body 6 is a double-unstable trigger controlled by two outputs. For example, a common industrial trigger with separate entrances is used for the 2TE10 locomotive. Frequency block 7 is designed as a sawtooth voltage generator and multivibrator. The sawtooth generator is w} started by a pulse cut from a reversible counter. 5 Both the saw voltage generator and the multivibrator are made according to a known scheme. In some particular cases, the sawtooth generator may be replaced by a generator, the output voltage of which varies according to a different law, for example, exponential. The device works as follows. The signals from the frequency sensors of the speed of the wheel pairs are fed through the switch1 1 to the counters 2. At a time, the counters 2 through the switches 1 receive signals from the frequency block 7 with the time variable frequency of the pulses. After filling in one of the counters 2, the element 3 is compared and starts the reversing counter 5, which resets the counters 2 and prepares the frequency block 7 for start with a time variable pulse frequency, and also gives a pulse to the executive unit 6. If during the time of filling the counters 2 there was no blocking, both counters are filled with the same speed and at the outputs of the partial capacitance of both counters 2 a signal appears which, through an AND 4 logic gate, prohibits the switching on of the actuator 6. If during the filling of the counters 2 was boxing. one of the wheel pairs, the counter 2 of the boxing wheel pair is filled to its capacity, before the counter 2 of the non-box wheel pair is filled to a part of the tank. In this case, at the output of the AND 4 logic element, the signal does not appear and the pulse from the reversible counter 5 turns on the actuator 6. At the end of the pulse from the reversible counter 5, the next analogous counting cycle starts. The sensitivity of the anti-boxing device AV is defined by the following expression: AV (ANV-AK), where k is the coupling coefficient between the speed of the wheelset and the frequency of the frequency speed sensor; f (.p (t) is the frequency of the pulses from the frequency 7 unit with a time-varying pulse frequency; AN is the capacity of counter 2 between the outputs for full and partial capacity; V is the speed of the locomotive; the total capacity of counter 2. Based on this dependence The range of variation of the frequency of the frequency block 7 of the frequency with the time-dependent frequency of the pulse followed was determined, for which the traction characteristic of a particular type of locomotive was previously determined experimentally.

5697362

11р; The proposed invention makes it possible to most fully utilize the traction properties of a locomotive, in particular a diesel locomotive, when operating at the adhesion limit, since the sensitivity of the device at various speeds s of the locomotive is closest to the limits of operational glide at times of movement speeds.

Claims (1)

Invention Formula Device for anti-roll protection of electric rolling stock by author. swith No. 588147, characterized in that, in order to change the sensitivity depending on the speed of the locomotive, the input of the frequency block is connected to the output of the reversible counter.