SU600264A1 - Device for automatic registration of excavator effeciency - Google Patents

Description

one

The invention relates to single-bucket excavators and can be used for automated recording of the operation of an excavator.

A device is known for automatically taking into account the production of an excavator, counting the number of shipped buckets filled with not less than 60% of the weight of a fully loaded bucket 1.

However, such a device does not provide a high accuracy metering, since shipped buckets that are less than 60% full are not taken into account, and, moreover, all buckets to be counted are considered to be 60% full.

A device for automatically recording excavator production is known, comprising its lift motor current sensor with an integrated amplifier at the output, an indicator of complete excavation cycles, to the input of which unloading and turning sensors are connected, key elements and a totalized block associated with a pulse counter 2.

This device does not provide sufficient accuracy, since it registers not the weight of the rock mass in the bucket, but the fact that the bucket is filled in more than 25, 50, 75 and 100% of some rock mass that is 100% weight that can be placed in the bucket.

The aim of the invention is to improve the accuracy of accounting.

This is achieved by the fact that the proposed device for automatically recording the excavator output is equipped with a two-channel waiting pulse generator stable

duration, the inputs of which are connected to the indicator of full excavation cycles, and the outputs - to the inputs of the corresponding key elements.

FIG. 1 shows a block diagram of the proposed device for automatically recording excavator generation; in fig. 2 - time diagram of work.

The device (see Fig. 1) contains a current sensor 1 of the lifting motor; rotation sensor 2,

unloading sensor 3, indicator 4 full excavation cycles, which includes the comparison circuit 5, to the input of which 6 the reference voltage level is supplied, the coincidence circuit 7, the delay circuit 8, the Schmitt trigger 9 and

a matching circuit 10, a dual channel lush generator of 11 pulses of stable duration, which includes pulse shapers 12 and 13, a pulse shaper of stable duration 14 and logic circuits OR 15, AND 16, AND 17; an integrating amplifier 18, key elements 19 and 20, a summing unit, consisting of an integrated amplifier 21 with a capacitor 22 in the feedback circuit, a comparison circuit 23, to the input 24

which is supplied with the reference voltage level, and the output of the comparison circuit 23 is connected to the control output of the switch 25, which shunt the capacitor 22, and to the input of the digital pulse counter 26.

The device works as follows.

When the bucket is raised and when the bucket is raised, the current sensor 1 produces a voltage level corresponding to the weight of the bucket filled with rock mass. This level is converted by the comparison circuit 5 into a standard signal input to the circuit 7, to the second input of which a signal from the rotation sensor 2 is supplied. An impulse appears at the output 7 of the circuit. Delayed by the circuit 8, this pulse switches the Schmitt trigger 9. When a bucket unloading command is issued, the unloading sensor 3 emits a pulse coming along with the signal from the trigger 9 output to the circuit 10. If the signal from the unloading sensor coincides with the signal at the trigger trigger 9, and therefore there is a pulse 10, this means that the excavator produced a full cycle. Indeed, the delay of the circuit 8 is equal to the minimum possible duration of the turn for unloading, if the unloading command coincides with the signal delayed for this time, this means that there is a complete excavation cycle.

The pulse from the output of indicator 4, shown in the timing diagram (see Fig. 2), is fed to the dual-channel standby generator 11, and therein to the pulse shaper 12 and 13. The pulse shaper 12 generates a pulse with a duration ti along the leading edge of the pulse 4. Shaper pulses 13 generates a pulse of duration i, delayed relative to the leading edge of pulse 4 for time / s. The pulses from the outputs of pulse shapers 12 and 13 through the OR 15 circuit are fed to a pulse shaper of stable duration 14, which forms along the front the front of these pulses are pulses of stable duration tz, and the pulses from the formers 12 and 14 through the AND circuit 16, or, alternatively, from one of the outputs of the two-channel standby generator 11 are sent to the key element 19, and the pulses from the other output of the standby generator 11 are fed to the control input key element 20. The pulses arriving at the control input of key elements 19 and 20 have a stable duration of 2. When the driver sends a signal to unload the bucket at the output of the circuit 16, a pulse 27 is formed, the key element 19 opens, of a current sensor 1, the proportional weight of the filled bucket is supplied to summpruyun1, s unit which outputs at this voltage increases (portion 28). This increase occurs during the action of the pulse 27. The growth rate is directly proportional to the value of the voltage at the output of current sensor 1. With the cessation of the pulse 27, the voltage increases to stop (section 29). The time / 3 slightly exceeds the unloading time, after which time a pulse 30 appears at the outputs of the formers 13, 14 and circuit 17, opening the key element 20, the voltage from the current sensor 1, corresponding to the empty weight of the bucket, is fed to the summing unit (section 31). With the cessation of the pulse 30, the voltage change at the output of the summing unit is stopped (section 32), the voltage at the integrator output is proportional to the weight of the rock mass discharged from the bucket.

With the sequential unloading of several buckets, the voltage at the output of the summing block increases, while it is proportional to the total weight of the rock mass found in all the unloaded buckets. This voltage is applied to comparing circuit 23,

5 to the input 24 of which the reference voltage level is applied, which determines the amount of rock mass, which should be taken into account with the help of a summation unit, for example, 100 tons. If this value is exceeded, the output of the circuit

0 comparison 23, a pulse is detected, detected by the counter 26, which opens the key 25, as a result of which the capacitor 22 is discharged, at the output of the summing unit a zero level of voltage 5 PIA is set.

Claims (2)

1. Plekhanov Yu. V. and others. Equipment for automatic control and accounting of single-bucket excavators. - “Mining Journal, 1973 № 5, p. 13-18. 2. USSR author's certificate number 293940, cl. E 02F 3/26, 1969. T Mr. u; V-- I / 7 /five