SU1435939A1 - Hydrostatic geodetic level - Google Patents

Description

The invention relates to geodetic instrumentation, in particular to hydrostatic levels of the electrocontact type, and can be used to measure the magnitude of additives or concepts of the earth's surface in geodesy, buildings and structures in construction, in accelerators of elementary particles, etc.

The aim of the invention is to improve the reliability and automation of measurements.

Figure 1 shows the mechanical part and the block diagram of the device; Fig. 2 shows rectangular pulses formed by the former and received from the transducer block.

The device comprises a housing (not shown) in which the vessel 1 with the liquid is located, the rod 2 with the slider 3 and the electrode 4, the micrometer screw 5, connected to it via gear system 6 converter unit 7 and electric motor 8, power connection unit 9 , a stabilizer 10, a waste pulse shaper 11, a coincidence circuit 12, a pulse shaper 13, a switch 14, an electrode displacement limiter 15, a motor control unit 16, a matching unit 17, and a shutdown unit 18.

The device works as follows.

By an external command received at power supply unit 9, for example, by a telemetry signal, a power source (not shown) is connected to the stabilizer 10. When the voltage at the stabilizer output and on all circuit elements reaches the nominal, the needle electrode 4 will receive a power potential, from the output of the faulty impulse generator 11 to the inputs of the engine control unit 16 of the switch 14, a discharge pulse will arrive, setting the triggers of these units to the initial state. In this state, the output of the engine control unit 16 through the matching unit 17, the engine operation command 8 is sent in the forward direction, and via the communication switchboard — the coincidence circuit receives the information output prohibition signal.

The moment of the beginning of the measurement does not occur immediately, but only after two turns of the micrometric screw 5, which: is due to the need to select people)

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com of all mechanical parts of the device.

The position of the origin, which the electrode occupies after two turns of the screw 5 due to the rigid kinematic connection of the rotating parts of the device, remains constant from measurement to measurement. The fixing of the reference position is carried out with the aid of a transducer block 7, which operates as follows. With the start of rotation of the motor, axes and gears in the converters, three types of pulses are formed: the measuring (fig. 2a), the revving pulses of the micrometer screw 5 (fig. 26) and the electrode position pulses (fig. 2c). The measuring pulses through the imaging unit 13 fall on a coincidence circuit, but before the measurement begins, they do not pass through the output due to the action of the said inhibiting signal on the commutator - coincidence circuit. The other two pulses go through the driver 13 to the switch 14, but until they synchronously arrive, they do not trigger any new command in it. The coincidence in time of these pulses determines the location of the electrode at the measurement start position. This coincidence causes a flip-flop of a trigger on the commutator 14, as a result of which a linking signal, which previously previously prohibited the transmission of information, does not come into contact with the circuit 12. From the output of the coincidence circuit, an information receipt (counting pulses) is started in the out-of-box receiving device.

The output of the measuring pulses continues until the contact of the liquid 4 with the electrode. At the moment of contact, the potential of the electrode 4 decreases to zero and, through the disconnecting unit 18, the electrode is disconnected from the power supply. The signal from the shut-down unit 18 is fed to the engine control unit 16 and from its output through the matching unit 17, in the form of a reverse command, goes to the electric motor 8. Under the influence of a signal from the output of the engine control unit 16, the output information switch 14 is generated at the output of the switch 14, incoming lia scheme 12 matches.

The reverse of the engine 8, i.e. its reverse rotation leads to the rise of the electrode 4 from the surface of the liquid.

Due to the instantaneous disconnection of the electrode at the moment of contact, as well as the fact that the ascent occurs immediately after contact without penetration into the fluid, the needle electrode is practically not subjected to corrosion and electro-erosion.

When the electrode 4 in the reverse course reaches the measurement start position from the transducers 7, two pulses synchronously arrive, which passed the shaper 13, hit the input of the switch 14, which, under their influence, turns on the limiter 15 extreme lower and upper positions. Pulses of the speed of the micrometric screw 5 through the shaper 13 also arrive at the input of the limiter 15. When the electric generator 4 reaches the extreme upper position, which corresponds to two revolutions of the micrometric screw, the output of the limiter 15 to the input of the switch 14 receives a signal

1435939

the input of the engine control unit 16 is given to the command for further operation of the engine 8, and the power supply unit is given the command to disconnect from the power supply.

The electrode reaches its initial position, the measurement cycle is completed.

The device can be used in another embodiment: when the measurement is performed while the electrode is reversing. In this case, the moment of the contact of the electrode with the liquid is taken as the starting point, and the end of the reference is the moment of the simultaneous arrival of two pulses from the transition from 7 to 7.

The system can operate both with remote control and autonomously under the influence of telemetry signals or the built-in timer.

All electronic components of the system are built on integrated circuits of CMOS structure.

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Claims (2)

1. HYDROSTATIC LEVEL, containing a vessel with an electrically conductive liquid, an electric motor, a kinematically connected micrometer screw, on which a rod with an electrode is mounted, a stabilizer, a pulse shaper, a disconnecting unit, characterized in that, in order to increase reliability, and automate measurements, it equipped with a power supply unit, a pulse shaper, a matching circuit, a switch, an electrode limiter, an engine control unit, a matching unit, and a conversion unit In this case, the power supply unit through the stabilizer is connected to the first input of the switch and to the first input of the engine control unit, the first output of the pulse shaper is connected to the first input of the coincidence circuit, the second output is connected to the third input of the switch and the first input of the electrode limiter, the first output the switch is connected to the input of the power supply unit and to the second input of the engine control unit, the second output of the switch is connected to the second input of the matching circuit, the third output of the switch is cut the electrode movement limiter is connected to the third input of the engine control unit, the first output of the engine control unit is connected to the first input of the matching unit and the third input of the matching circuit, the second output of the engine control unit is connected to the second input of the matching unit and the fifth input of the switch, and the output of the matching unit connected to the motor input, the outputs of the converter unit are connected to the inputs of the pulse shaper, while the electrode is connected through the disconnecting unit to the fourth input of the control unit engine power. 2. leveler pop.1, characterized in that the transducer unit is in the form of photodiodes with three illuminators and mechanical 'light modulating system ⁴ associated with the hydrochloric micrometer screw and the motor. SU 1435939 A1