SU439005A1 - Device for monitoring and recording the work of an excavator - Google Patents

Description

one

The invention relates to the field of instrumentation and computer technology and can be applied to open pit excavators of the type "mechanical shovel and" dragline.

Known devices for recording and monitoring the operation of an excavator include sensors, a time relay, a counting relay, a counter, and indicators. At the same time, the work of the excavator is taken into account under the condition that the operations are carried out in strict sequence.

However, such devices can be used only for dragline excavators, besides, they cannot take into account such activities as lower and upper unloading of the bucket without rotating the platform or lower unloading of the bucket with rotating the platform, but without lifting the bucket.

This narrows the field of application of the device and reduces the reliability of its operation.

In order to increase the reliability of the operation, a device limiter, a reed switch, thyristors and a transformer are introduced into the proposed device. A bucket unloading sensor through a non-switch and control electrode of the input thyristor is connected to one output of the transformer primary winding, the secondary winding of which is connected respectively via a voltage limiter and control electrode of the power thyristor which anode is connected to the counter to the bucket discharge sensor connected to another to the transformer winding terminal, to the time relay and to the thyristor anode, the control electrode of which is connected through the thyratron and the cathode is connected to the cathode of the power thyristor through a capacitor ora and pulse counting relay. A reed switch is connected in parallel with the time relay capacitor. Diagram of the device depicted: en in the drawing.

The device contains a power source 1, a capacitor 2 and a resistor 3, components of a time relay 4, an input thyristor 5, a transformer 6, a bucket dump sensor 7, a switch 8, a resistor 9, a power thyristor 10,

a counter of the number of unloaded buckets 11, a counting relay and pulses 12 connected to an indicator 13, a switching capacitor 14, a thyristor 15, resistors 16, 17, a thyratron 18, a voltage limiter 19, a reed switch 20, a resistor 21 and a bell 22.

The device works as follows. When current source 1 is on, capacitor 2 begins to charge through resistor 3. Charging time is equivalent to the time of the minimum excavator duty cycle, after which the charge reaches the threshold level and the device acquires a constant readiness for reading.

When the sensor 7 is turned on, the capacitor 2

discharges to resistor 9 through switch 8 and control electrode-cathode of thyristor 5. If the discharge current is less than the threshold current of the thyristor 5, then the thyristor does not open, which eliminates the premature (false) reading of the counter 11. If the charging time is maintained, then the thyristor 5 is opened and the capacitor 2 is intensively discharged into the nervous winding 23 of the transformer 6 (after which the capacitor 2 starts a new charging cycle). At the same time, from the secondary winding 24 of the transformer 6, a positive current pulse is applied to the control electrode-cathode of the thyristor 10, and the latter opens. The current passing through it from the anode to the cathode of the current source 1, turns on the counter 11, the pulse counting relay 12 and the indicator 13. In this state, the anode of the power source 1 moves to the cathode of the power thyristor 10 and the capacitor 14 begins to charge through the resistor 16 When the charge on the plates of the capacitor 14 reaches the threshold value, the thyratron 18 is ignited. The current passes from the anode to the cathode of the capacitor 14 through the resistor 17, the thyratron 18 and the control electrode-cathode of the thyristor 15 and opens the latter. When the thyristor 15 is turned on, the polarity of the capacitor 14 is changed, and the thyristor 10 closes with its energy of discharge, and with it the counter 11, the pulse counting relay 12 and the indicator 13. With increasing charge level of the capacitor 14, its charging current drops and the thyristor 15 closes.

The subsequent switching on of the thyristor 10 (and counter 11) is possible only when the full charge of the capacitor 2 is reached, equivalent to the time delay of the minimum possible operation cycle of the excavator.

Then the cycle of operation is repeated.

In the event that the operating voltage is exceeded or when an alternating current is applied to the device, the reed switch 20 located in the coil 25 is activated to short. As a result, a resistor 21 is connected to the capacitor plates 2 and discharges it. This eliminates the inclusion of a thyristor 10 (and counter 11) and damage to the device.

A voltage limiter 19 protects the power thyristor 10 and the counter AND from overvoltage and prevents them from being turned on.

At the time of the excavator auxiliary work, the switch 8 is moved to the second position. In this case, when the bucket 7 unloading sensor is turned on, the bell 22 is turned on, signaling that the counter of the number of unloaded buckets AND is off.

Subject invention

A device for monitoring and recording the operation of an excavator, comprising a bucket unloading sensor, time setting a cenochone, a capacitor,

a pulse counter relay and a switch through an indicator and a bell, respectively, connected to a power source, characterized in that, in order to increase the reliability of the device, they are entered

limiter, reed switch, thyratron, thyristor and transformer; the bucket unloading sensor is connected via a switch and control electrode of the input thyristor to one of the terminals of the primary winding of the transformer, the secondary winding of which is connected to the circuit breaker and to the control electrode of the power thyristor which anode is connected to the counter, and the cathode is connected to the pulse counting relay connected via a thyratron and a capacitor, respectively, to the control electrode and the thyristor cathode; parallel to the capacitor, the time of the master circuit is connected to a reed switch connected to the cathode of the input thyristor and to the power source connected to the ladle unloading sensor, another output of the transformer primary winding, a counter, a limiter, and a thyristor.