SU931997A1 - Apparatus for diagnostics of hydraulic drive - Google Patents

Description

(5) DEVICE FOR DIAGNOSTICS OF HYDRAULIC DRIVE

one

The invention relates to hydraulic and testing equipment and can be used for in-line diagnostics of the technical condition of hydraulic systems; for example pumps.

A device for diagnostics of a hydraulic drive is known, comprising a pressure gauge connected via a switch and a converter with a recording unit.

The disadvantages of the known device are low reliability and complexity of the design.

The purpose of the invention is to increase reliability and simplify the design.

This goal is achieved by the fact that the converter is made in the form of an electrically interconnected integrator with circuits. Switching on and off, a discharge unit, a differentiator, a strobe pulse former, four multivibrators, three AND elements and is equipped with a zero-body, with the first inputs the first, second and third elements And are connected to the outputs of the first, second and third multivibrators connected in series, respectively, the second inputs - to the output of the differentiator, and the outputs from the recording unit, in the stroke of the first multivibrator is connected to the output of the fourth multivibrator, the other outputs of which are connected to the integrator on and off circuits, and the input through the gate driver to the output of the switch to which the on circuit, the integrator, the off circuit and the discharge unit are connected in series, and the integrator output through the null-organ is connected to the input of the differentiator.,

FIG. 1 shows a diagram of a device for diagnosing hydraulic drive} in FIG. 2 - timing charts of the device.

The device contains a pressure gauge of hydraulic actuator 1, made in the form of sensors 2-5, switch 6 and converter, made in the form of integrator 7 with switching on and off circuits 9, 9, respectively, discharge unit 10, differentiator 11, generator 12, strobe pulses, first, second, the third and fourth multivibrators 13-16, respectively, of the first, second and third elements And 17-19. respectively, and is equipped with a null organ 20. The first inputs of the And elements are connected to the outputs of multivibrators 13 15 serially connected to each other, respectively, the second inputs are connected to the output of the differentiator 11, and the output is connected to the registration blocks 21, the input of the multivibrator 13 is connected to the output of the multivibrator 19 Other outputs of which are connected with circuits 8 and 9 of integrator 7, output 3 — through strobe pulse generator 12 — with output of switch 6, to which the switch-on circuits 8, integrator 7, shut-off circuit 9 and discharge unit 10 are connected, and the output of the integrator 7 through the null body 20 is connected to the input of the differentiator 11.

Chart 22 (FIG. 2) is a pulse generated by a 2, 3, or 5 sensor, 23 is a switching circuit 8, a diagram by a strobe pulse shaper 12, a diagram 25 by an integrator 7, a chart 26 by a multivibrator 1, a diagram 27 - block 10 bits, diagram 28 - multivibrator 13, diagram 29 multivibrator 15, and diagram 30 - null organ 20.

The device for the diagnosis (hydraulic sticks works as follows.

The signal from the pressure sensors 2-5 through the switch 6 is supplied to the integrator 7 on circuit 8 and to the strobe pulse generator 12, generating a starting pulse of the multivibrator 16, which generates a pulse of duration {. Its duration is set to the duration of the positive half period of the input signal. The pulses of the multivibrator 16 control the switching-on circuit 8 of the integrator 7 and the switching-off circuit 9 of the integrator 7 With the arrival of a pulse, the circuit operates

9 and turns off the 10-bit block, the turn-on circuit 8 also operates and the integrator 7 is connected to the output of the switch 6. The integrator 7 is charged by the input signal gated with an If pulse. With the end of the pulse l, the integrator 7 is disconnected from the switch 6 by the circuit 8 and connected to the output of the discharge unit 10 by the circuit 9. The integrator 7, charged to a value proportional to the input signal area, begins to discharge through the discharge unit 10, which provides

S of the discharge current during the entire cycle, therefore, the discharge of the integrator 7 occurs in a linear manner, and the duration is proportional to the area of the input signal.

Null 20 selects the start of the write output and the end of the read. At the end of the impulse l, the Multivibrator 13 is triggered, producing a pulse duration of 5. In turn, after the end of the pulse Id, the multivibrator Ij is triggered, producing pulses of duration J, and at the end of the pulse cj the multivibrator 15 is activated, generating pulses of duration c.

The magnitude of the discharge current is chosen so that the end of the pulse of the nullorgan 20, corresponding to the end of the readout at a normal input signal, lies within the range of the pulse duration 13. Then the impulse corresponding to the end of the reading coming from the output of the differentiator 11 to the element I 17-19 will pass to the output of only the element 18.

If the input signal is changed so that the area of the study area decreases, which means the impulse from differentiator 11 is within LI, then the logical unit (signal) will be at the output of element 17. And with increasing area of the input signal, the logical unit will be at the output of element 19, as impulse from differentiator 11 will be within i.

The signals arrive at the registration unit 21, where the corresponding output signal of the hydraulic actuator 1 is generated when the input signal area and the specified area of the normalized signal are equal, or

malfunction output with decreasing and increasing the input signal area compared to the normalized signal area.

The use of the proposed device for the diagnosis of non-refillable detection of defects, which serves to prevent the emergency interruption of the fluid supply and does not require the use of a model of the hydraulic drive being diagnosed, thus ensuring the simplicity of the device design.

Claims (1)

1. USSR author's certificate IfSlH O, cl. F 15 B 19/00,. g ;: ir. s.