SU57709A1 - Device for actuating air sandboxes - Google Patents

Description

The proposed device for actuating air sandboxes, which includes so-called solenoids already known for their use in such constructions for the independent opening of air valves, is designed to automatically activate sandboxes installed in this direction of movement at the oncoming wheels of the car. train deceleration passes a certain value, taken with some margin of safety in relation to the maximum possible, which is determined by the coefficient of adhesion of wheels to lsami. For this purpose, according to the invention, the air valves of the proposed device are associated with inertial: with a weight serving to automatically open them during emergency braking when the train slowdown exceeds the above value. In case the deceleration falls below this value, the action of the sandboxes is automatically terminated.

In FIG. 1 shows the general scheme of the device and FIG. 2 is a diagram of the device installation in train cars.

The proposed device consists of air valves 1, 2, connected by means of a T-shaped lever 5 with an inertial load 4 (Fig. 1).

When the train brakes, due to the presence of deceleration, the inertia force appears on the load 4 and has a direction that coincides with the direction of the train. This force, turning the lever 4 around the fixed axis 5, tends to press down the valve 1, which is held in the upper position by the total force of the spring and the compressed air pressure of the pressure line 7 of the sandboxes.

When the inertia force acting on the load 4, through the lever 5, creates a force on the valve 1, directed downward, exceeding the force acting on the valve up, the latter will be switched to the lower position, thereby producing the inclusion of the front sandboxes of the cars (under the rolling wheels). The slowdown at which the sandbox should work (f / nec) is selected with a certain margin, i.e., 0.7-0.8 Ears, where btau is the maximum train deceleration. Thus, the sandbox is turned on earlier than it can occur.

critical deceleration, thereby increasing the coefficient of adhesion of the wheels to the rails and preventing the wheels from slipping.

When the car moves in the direction opposite to that indicated in the arrow / 1i diagram (Fig. 1), the device proceeds in the same way as described above, only in this case, when the braking force of the inertia of the load 4, acts on the direction of motion through the lever 3 It already includes the valve I and compressed air arrives at the rear sandboxes of the car, which, in this direction of movement, are mounted under the rolling wheels.

Thus, the device automatically turns on the car's sandboxes installed, according to the given direction of travel, under the oncoming wheels, and this activation occurs only at a predetermined distance of the train. In case the train deceleration becomes lower than the set value, to which the device is adjusted, it disappears completely (uniform motion, stop), then the force acting upwards and the valve 1 or 2 (depending on the direction of motion) will be greater than that acting down from load 4 through lever 3 and the valve returns to its upper position (shown in the diagram), stopping the supply of sandboxes with compressed air. The compressed air in the drive of the sandboxes 1 At the same time, it enters the atmosphere through a gap between the upper clan and the saddle.

In order to control the sandboxes manually, at any and unlimited time, the device, as already mentioned, contains solenoids 8 (Fig. 1), which are used to open air valves /, 2, and an inclusive button 6 is installed in the cab of the car. button 6, the voltage enters the wire / (Fig. 2), which sends a current. in the coil of the solenoid valve 1, including the front sandbox of the car. When the voltage is removed from the wire / the work of the front sandboxes is stopped. Since the location of the cabin in the car determines the direction of travel, the inclusive button 6 is connected to the valve that sends air to the sandboxes under the rolling wheels (Fig. 2). As for the rest of the train cars, they also include valves that send air into the sandboxes beneath. rolling wheels.

In the diagram, control occurs from cabin B. When the button 6 is turned on in the cabin of the first car, current flows into the valve /, which sends air to the sandboxes of the rolling wheels. In the second car, the cabin of which is located opposite to the direction of movement, the current enters already in wire II, including valve 2, which in this case also communicates with the connecting wheels of the car. In the third car, the cabin of which is located along the movement, will be the same as in the first car, etc.

The subject matter of the invention.

A device for actuating air sandboxes, including solenoids for opening air valves, wherein the air valves are associated with inertial load, which is used for emergency braking to open air valves and supply air to the front or rear sandboxes of the car depending from the direction of movement of the car. to the author's testimony of L. S. Fig. Faina La 57701

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