SU783086A1 - Method of controlling the nozzle feeding sand under railway vehicle wheels - Google Patents

Description

The invention relates to railway transport and can be used to increase the coefficient of adhesion of wheels to rails by supplying sand to the zone of their contact.

There is a known method of controlling nozzles for feeding sand, which is included in the pulse of compressed air into the nozzles IJ .10

Although the pulsed mode favorably affects the stability of the injectors, however, when the wheel sets travel along sandy rails (i.e., in the intervals between pulses) | j there may be a clutch disruption.

There is a known method of controlling nozzles for feeding sand under the wheels of a rail vehicle, which consists in supplying impulses of compressed air to the nozzles of different trucks with mutual shift in phase 2.

However, this method has insufficient efficiency.

The purpose of the invention is to increase the efficiency by improving the adhesion of the wheels to the rails.

This goal is achieved by the fact that the phase shift between the moment the nozzles of the front carriage are turned off and the time the nozzles of the next carriages are discharged is inversely proportional to the speed of the vehicle and directly proportional to the distance between the nozzles.

The essence of the invention is illustrated by the example of its specific design for a six-axle locomotive.

Figure 1 shows the principle electropneumatic scheme of a locomotive that implements the proposed method; in fig. 2 (a, .b, c) and 3 (a, b, c) pulse diagrams; Fig.4 is a graph of dependence characterizing the phase shifting device.

Claims (2)

The locomotive (FIG. 1) has motor carriages 1 and 2 (the remaining chassis components of the locomotive are not shown). For the direction of movement of the locomotive, shown by the arrow 3, bunkers 4 and 5 for sand are provided, connected by nozzles 6 and 7 with nozzles 8 and 9. These nozzles are also connected by nozzles 10 and 11 through a disconnecting valve 12 with a pressure air line 13 of the locomotive. The nozzles 10 and 11 have electro-pneumatic valves (EPV) 14 and 15. To the outlet ports of the nozzles 8 and 9 are attached pipes 16 and 17, each of which ends with a nozzle directed into the contact zone of one of the wheels of the front pair of wheels of the respective carriage with the rail 18. Similar sand bunker, sand-conducting pipe, nozzle, and pipe with nozzle are provided for Blow another wheel from the front wheel; pairs of each bogie. Listed before; Additional nozzles are connected to the branches of nozzles 10 and 11. For controlling the EPV coils 14 and 15, there are contactless impulse switches 19 and 20 connected by electrical wires 21 and 22 to the indicated coils; and wires 23 and 24 through the control button 25 to one of the terminals power supply. Control inputs of keys 19 and 20 co; united with electric generators: pulses 26 and 27. As a generator 26, a multivibrator can be used, and as a generator 27, a single vibrator, whose input is connected to the output of generator 26 via a phase-mixing device (FSC) 28, controlled by speed sensor 29 The nozzles are controlled as follows. : To supply sand, the driver presses the button 25, as a result of which the electrical voltage 50V from the source through the keys 19 and 20 enters the EPI 14 and 15. The key 19 is periodically turned on and off by the pulse generator 26, and the key 20. by the generator 27. At the same time, the EPW 15 and 14 pulses pass compressed air from the pneumatic line 13 to the nozzles 8 and 9, due to which sand coming from Ounkers 4 and 5 to the same nozzles is fed through pipes 16 and 17 to the contact area of the wheels with rails. In the actual method (figure 2), compressed air pulses are supplied simultaneously to the nozzles of the front and rear carts (figure 2 a, b). When the period of the following pulses is T 0.5-1c, their filling factor is, o, 3-0, usually it is chosen close to 0.5. At the same time, the supply of sand to the rails is characterized by the diagram in Fig. 2c, from which it can be seen that, after the nozzles 9 of the rear carriage, there are unclean sections of the rails. In the proposed method (FIG. 3), the nozzle control loops produced by the generators 26 and 27 are shifted along the Oas so that the rear nozzle is switched on after a time interval proportional to the distance between the nozzles and inversely proportional to the speed of motion after the front nozzle is turned off. This shift is shown in FIG. 3 a, b. Due to the shift in relief after the passage of both nozzles 8 and 9, there are no uncleaned areas, which substantially improves the adhesion conditions of the second cart (Fig. 3c). This shift is provided by a phase-mixing device, which operates according to the signals of speed sensor 29. FSU 28 can be performed on the basis of a controlled one-shot. A plot of the delay provided by it against the speed is shown in FIG. At low speeds, this delay is limited at a level equal to the gap between adjacent pulses. When this FSU 28 works with the set speed. The invention The method of controlling nozzles for feeding sand under the wheels of a rail vehicle, consisting in supplying pulses of compressed air to the nozzles of different carriages with mutual phase shift, characterized in that, in order to increase efficiency by improving the traction of wheels with rails, the phase shift between the moment of switching off the nozzles of the front truck and the moment of turning off the nozzles of the next truck is carried out in inverse proportion to the speed of the vehicle and forward o proportional to the distance between the nozzles. Sources of information taken into account in the examination 1. The author's certificate of the USSR 591345, cl. B 61 C 15/10, 1977. 2. USSR author's certificate number 598779, cl. B 60 B 39/04, 1977 (prbtotip). 1 (1G) Y 8 to Ai V (1-7} Tr -vrf VV r 1 - 1 / -I k S y JSSSX y yssss I //// L IY /////// 7 ///// A ///// //////// A 9 U- r-- U-at U yrr - J one vr 4 ysssss yssy JWsssss y V //, //