SU945039A1 - Master control for hoist electric drive - Google Patents

Description

(5) TARGET DEVICE FOR ELECTRIC DRIVE

one

The invention relates to an automated electric drive and can be used as a driver for an electric drive of mine hoisting installations.

Known setting device for the electric lift, containing the inverting switch and serially connected integrators

However, in this device, the duration of the jerk is determined only by the output signal level (upon reaching a predetermined level, a transition to the formation of the next section of the diagram occurs), which does not exclude dynamic loads on the lift nodes and, therefore, affects their lifespan. In addition to the difficulty of accurately specifying the duration of the jerk, it is difficult to automatically rebuild the driver while lifting from different horizons of the mine. So, for example p. LIFT

with a significant change in the length of the rope, it is also necessary to change the jerk time in order to eliminate the load oscillations during the start of the mechanism, which makes this device not convenient to use.

The purpose of the invention is to increase the service life and increase the convenience of operation.

This goal is achieved by the fact that

(A controlled one-shot vibrator, a sensor unit, a threshold circuit, and a differentiating circuit were inserted on the device, the output of the controlled one-shot through the inverting switch

15 is connected to the input of the first integrating amplifier., And the output of the second integrating amplifier through a threshold circuit and Au (x differentiation circuit, as well as the input signal is connected to

20 to the trigger input of the controlled one-shot, to the control input of which the output of the sensor unit is spun, and the output of the threshold circuit of the connection with the control input of the inverting switch.

Figure 1 shows the functional scheme of the device; Fig.2 timing diagram of the device; FIG. 3 is a characteristic input-output threshold of the feedback circuit of the device.

The driver consists of two series-connected

integrating amplifiers 1 and

a controlled one-shot 3 with an inverting key k, a threshold circuit 5, a differentiating circuit 6. and a block of 7 sensors. The output of the one-shot 3 through the inertia key 4 is connected to the input of the integrating amplifier 1. From the integrating amplifier 2, the output signal and feedback signal is taken, coming through the threshold circuit 5 and the differentiating circuit to the trigger input of the single-frequency 3. In addition, the output signal of the circuit 5 is the control for the inverting switch A; The pulses corresponding to the start and slow start are also fed to the trigger input of the one-shot 3.- The time and amplitude of the output pulse of the one-shot 3 are controlled by the output signal (signals) of the block of 7 sensors.

The device works as follows.

A trigger pulse is applied to the one-vibrator, the torus 3 (Fig. 2, pos. 1- (1 in)). for a device by a jerk. A reference through an inverting switch is fed to the input of the first integrating amplifier.

The functions of the inverting key are as follows: with denial. At the input signal, the key passes a signal through itself, without inverting it. When the control signal is changed, the signal passing through the key is inverted. The output signal of the first integrating amplifier and for the time from O to f. linearly altered by the drive acceleration reference signal. The output signal of the second integrating amplifier Urt is parabolicly variable at this time, setting the speed

electric drive. After the end of the one-shot pulse, the signal U stops growing and the time from IT to SL is the time of movement with constant acceleration. At this time, the signal Un increases linearly until the voltage at the input of the feedback circuit 5 reaches the value of the voltage Uc-x (Fig. 3).

Under the condition, circuit 5 changes its state (Fig. 2, graph Uj) and at the same time, the following processes take place. Through the differentiating circuit b, a pulse arrives at the trigger input of the one-shot (figure 2, pos. I). At the same time, due to a change in the polarity of the output signal, the inverting switch sends a signal to the first inverting amplifier 1 of the opposite polarity. This leads to the fact that the signal at the input of the first integrating amplifier 1 starts y6biBatb linearly down to zero, and the output signal of the second integrating amplifier 2 parabola goes to the steady-state value. Thus, the overclocking ends.

Processes during deceleration proceed in a similar way. A start-up impulse (Fig., 2, pos. III) comes and, due to the hysteresis of the threshold circuit, its reverse switching occurs when the output signal decreases to (Fig. 2, pos. IV and Fig. 3). The lower response threshold of circuit 5 determines the final value of the specified C1x rate (zero or the dot-spacing rate). Thus, the final value of the velocity and the moments of its Beginning are controlled by feedback, and the moments of smooth transitions are determined by the pulse time of the one-vibrator 3.

A sensor block inserted into the driver allows the velocity diagram to be adapted to the operating conditions.

In the presence of several depths of rise from which it is necessary under-. There is a load on each of them, a sensor is installed, which, when the electric drive starts up, produces two signals from this horizon. One of the signals determines the pulse time of a single-oscillator (the duration of the jerk), and the second sets the amplitude of this pulse so that the acceleration given by the elec-

The drive was constant, independent of the depth of the climb. This provides automatic tuning of the driver.

Setting a jerk time using a single-shot, the pulse time of which is determined by its internal properties, the device provides increased accuracy of setting this time, and the sensor unit allows you to automatically adjust this time.

Accurate setting of the jerk time and its automatic regulation reduces the dynamic loads on the mechanical equipment, which ultimately reduces the accident rate during operation of the lifts and increases their lifespan.

Claims (1)

1. USSR author's certificate №, cl. B 66 B 1/30, 1976 (prototype).