SU441777A1 - Indicator of the maximum slip of the wheelset rolling stock - Google Patents

Description

one

The invention relates to control devices for traction of rail vehicles and can be used to detect the skidding (slip) of wheelsets of rolling stock.

Indicators are known for determining the moment of slip of wheelsets of a rolling stock, containing frequency sensors, separators and pulse shapers, logic elements, reset generators, actuators,

However, existing devices have a low coefficient of sensitivity.

The purpose of the invention is to increase the reliability and sensitivity of the indicator.

This is achieved by the fact that the proposed indicator is additionally equipped with a generator of pulses of a constant frequency, the output of which is connected to the inputs of counters through pulse separators

The drawing shows the scheme of the proposed device as applied to a diesel locomotive with six traction engines.

The device consists of six completely identical circuits and seven control units connecting these circuits. Each circuit consists of a frequency sensor 1 of rotational speed, a generator of 2 rectangular pulses, a separator 3 pulses, a counter 4, three AND 5-7 inverters, two inverters B and 9 and a Yu node of the operating memory, two logical elements OR 11 and 12, a block And 13, the generator 14 reset the output trigger block 15, the output relay 16, the auxiliary generator 17,

Frequency sensor 1 serves to convert the angular rotation of the wheelset to the appropriate number of pulses and is either a tachogenerator mounted on the axle of the wheelset or a special winding laid in the main pole of the traction motor.

Shaper 2 rectangular pulses is designed to convert the sinusoidal signals from the frequency sensor to its input into rectangular pulses, the frequency of which is equal to (or in the general case a multiple of) the frequency of the sinusoidal input signal. Pulse separator 3 serves to temporarily separate the pulses arriving at its inputs from the pulse generator and the auxiliary generator at the same time. Pulse counter 4 serves to count pulses arriving at its input during the counting time. Elements 5-7 and give signals after filling the counter to certain numbers of pulses and serve: element 5 to get the counting time; element 6 for receiving a signal that a wheel pair has reached the maximum slip (skidding) value; element AND 7 to cancel the signal received from elements 6, when the limit slip becomes less than the specified value, P1 inverters 8 serve to match the outputs of elements AND b and And 7 with the inputs of the OR blocks 11 and 12. The main memory node 10 is a trigger with separate inputs and serves to store the signal from the element, which ensures reliable operation of the device, and non-simultaneous dropping of the element. The control units process signals from six circuits, each of which is identical to the more value. Unit 13 (element I), which serves as the reference clock for counting all counters, generates a signal when all the inputs of signals from elements, in other words, the unit outputs a signal when the last hex signal arrives at its input. The reset generator represents a waiting one-shot that serves to activate the counters and main memory nodes to their initial state after the signal from block 13 arrives at its input. Element OR 11 serves to turn on the output relay when any signal arrives at its input. Apemeta (via inverter), i.e. when a wheel pair has reached the maximum amount of slip (skidding). The element serves to turn off the device after stopping the slip. The outgoing 1 gripping unit 15 is two triggers connected in series with counting inputs. Signals from the reset generator 14 are sent to the counting input of the first trigger, the trigger inputs are triggered, signals are sent from the elec. MeuT; Ashen Buxavani. The output relay is a flip-flop with separate inputs, one input of which is connected to the element, and the second to the output trip block. From the output of the output relay, a signal is received that a wheel pair has reached the maximum slip value. Auxiliary generator 17 is a constant frequency generator and is used to automatically change the indicator indicator from the static coefficient. The principle of the indicator is as follows. With a stationary diesel locomotive, the auxiliary generator generates pulses of a constant frequency. These pulses flow through the pulse separators to the counter inputs. The counters are filled with the same speed / speed, and the AND 5 elements of all the meters simultaneously emit signals that include the RAM nodes and the AND 13 block. And the 13 block starts the reset generator, resetting the counters and RAM nodes to zero and giving a pulse to output trigger block. At the end of the cycle of the reset generator, the next pulse counting cycle begins. When the locomotive moves without slipping, the operation of the device differs from that described above as follows. The frequency of the pulses at the inputs of the counters, coming from separate pulses, is determined by the sum of the frequencies of the pulses from the auxiliary generator and from the frequency sensors of speed. The pulse frequencies of the speed sensors depend on the speed of movement of the locomotive, therefore the speed of filling the counters is determined by the speed of movement of the locomotive (and the greater the speed) the faster the counters are filled. The number of pulses entering the counters from an auxiliary generator depends on the counting time, and the shorter this time, the smaller the number of pulses entering the counter. The process of filling the counters with pulses from an auxiliary generator can be considered as a change in the capacitance of the counter for signals from frequency sensors. From this it follows that with increasing speed of the locomotive, the counting time decreases, and, consequently, the capacity of the counters from the frequency sensors increases, which corresponds to a change in the static coefficient of sensitivity of the device. A further cycle of counting and processing signals is apopogic to the cycle described above for a stationary diesel locomotive. When a wheel pair reaches the limit of slip (when a wheel pair is slipping), the frequency of the speed sensor of this pair increases, the frequency of the following square impulses and the speed of the wheel pair trapping increase accordingly. At the entrance

A relay 16 (element I) of this counter appears a signal before the signals appear at block 15 (element i) of the remaining counters. This signal is inverted by the inverter, includes the element OR 11 and the output relay, signaling that the wheelset has reached the maximum allowable slip value.

Naturally, the signal of element 6 is preceded by signals from elements 5 and 7. The element writes its signal to the operational memory, and the output signal of the element passed through the inverter and the element resets the output trigger block to zero. In the meantime, the remaining checkers are filled to values at which signals appear at the element outputs. These signals include the RAM nodes, the AND 13 block and the reset generator, which resets the counters and RAMs to zero,

At the end of the work of the reset generator, the next pulse counting cycle begins, however, the output relay continues to generate a skip signal. This mode of operation continues until the slipping is completed. In the process of stopping the slipping, the output relay is turned off after the signal at the output of the element of the bumping wheel pair ceases to appear. Indeed, in order to output

the trigger block has turned off the output relay; the next two additional pulses from the reset generator should come to its input. But if a signal appears at the output of an And 7 element, then each counting stage is accompanied by a reset of the output trng block to zero by a signal from the And 7 element, converted by the inverter and the elements; IL 12. The elements of AND 7 and OR 12 and the output trigger block provide the creation of the required return coefficient of the run. The proposed device detects the skid, since formally the skid process of any wheel pair can be considered as the process of skidding the rest of the wheel pairs.

Claims (1)

Invention Formula The limit slip indicator for wheelsets of a rolling stock, containing frequency sensors, pulse splitters, drivers, counters and logic elements, a reset generator, is an auxiliary relay, characterized in that it is equipped with a constant frequency pulse generator to increase the indicator reliability; the output of which is connected to the input through pulse separators, and counters.