SU804775A1 - Device for weighing drag-line bucket - Google Patents

Description

The invention relates to the automatic measurement of the operating parameters of an excavator-dragline and, in particular, is intended to automatically determine the mass of the loaded excavator. A device for weighing a bucket of an excavator-dragline is known, which contains a bucket filling control unit, a drive operation unit, a bucket unloading control unit, a bucket fixation unit, a total angle of rotation 1 of an excavator shape, a bucket load measurement unit and an iameric sensor. In addition to other functions, this device provides a measurement of the mass of an excavator bucket during its movement in space. However, this measures the position of the bucket in space, and determines the mass of the bucket taking into account its position in the space lying to the weighing by the introduction of the corresponding coefficients, i.e. the process is sequential. A device is known for recording an excavator — a dragline — including an analog-to-digital converter, p & counters, a conversion number counter, elements (OR, pulse generator, low frequency amplifier, full-wave rectifier, and threshold device 2. However, the device is difficult when it is used Determining the coordinates of the bucket at the time of weighing is also required. The closest in technical essence and implementation is a device for weighing the bucket of an excavator - dragline, including Lock release static component currents podela drive mechanisms and thrust bucket associated with the roots of these chains and actuators connected to the inputs of the measurement unit load amount

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a bucket, to the other inputs of which the output unit and control unit are connected, CinoK fixing the area of space, ClnOK measuring the angle of rotation of the platform, sensors of the length of a rope and jrna rotating the platform, which are connected with the corresponding blocks of the platform. However, the device, although it provides measurement of the dragline bucket mass, is clearly difficult, since the device uses a block for fixing the area of space with the appropriate and sensors, and one provides for the introduction of a coordinate correction for determining the mass: (more) The weighing time also creates operational inconveniences: when the excavator is short-circuited, when the ropes are tied, when replacing them, it is necessary to adjust the block to fix the area of space.

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

The delivered circuit is achieved by the fact that the bucket load measurement unit is made in the form of two elements for selecting modules of signals, an adder, three keys, two integrators, a single vibrator, a comparator, an inverter and a nepeKnio, one of which is the selection of modules for signaling directly, and the other is connected via an inverter to the adder, the output of which is connected through the first key connected in series, the first integrator, comparator, one-shot second integrator, the second key is connected to the second input of the first integrator the third integrator is connected via a third key to the switch, the control inputs of the first and third keys are parallel in parallel, and the control unit is designed as an integrator, com-, g: arator, three identical drivers, three switches, two triggers and two inverto) X) c, the integrator output through a series-connected comparator, the first element I and the first one center: x p is connected to the corresponding input of the integrator, the output of the comparator is connected through the series-connected second one-one) ator, the first inverter is connected to the second the first element I and to the first input of the second element I and the serially connected third one and a second inverter connected 1C to the third third element I, the second inputs of the second and third elefles And are connected to the output of the comparator directly, the third and fourth inputs of the second element And the pots are connected to the inverting inputs of the first and second trigger, the direct output of the first trigger is connected to the third input of the third element AND, and the outputs of the second and third E and E are connected to the corresponding inputs of the first and orogo triggers.

FIG. 1 shows a block diagram of a device for weighing an excavator bucket — a dragline; in fig. 2 is a functional block diagram of the allocation of static drive currents; in fig. 3 is a functional block diagram of measuring the load of the bucket; in fig. 4 is a functional block diagram of the control unit; in fig. 5 is a diagram of the arrangement of lines of equal relations of static forces and average trajectories of the movement of the bucket during the upper and lower unloading of the latter.

A device for weighing a dragline bucket contains (Fig. 1) a static current isolation unit 1 for drives, a bucket loading measurement unit, a control unit 3 and an output unit 4. Elok 1, a 5–8 m subchapter are connected to the engine voltage and voltage respectively lifting mechanism and a gigabyte, the outputs of block 1 by. chains 9 and 10 are connected to the corresponding inputs of block 2, Block 2 through chains 11-13 is connected to the inputs of block 3, deports 14 and 15 are connected to the outputs of block 3. The inputs of block 4 are connected to the outputs of block 3 via circuit 15 and with the outputs of block 2 — along circuit 16. The block 1 for isolating static currents of the drives contains (fig. 2) sensors of currents 17 and 18 and voltages 19 and 20 of the main circuits of drives for the mechanisms of thrust and bucket lifting, differentiators 21 and 22, and adders 23 and 24. The input circuits of the adders 23 and 24 are connected respectively with the outputs of the current sensors 1.7 and 18 and the outputs of the differentiators 21 and 22, whose inputs They are connected to the corresponding outputs of the sensor 19 and 2O voltages. Unit 2 and measuring the load of the bucket contains (Fig. 3) elements 25 and 26 for extracting the analog signal module, inverter 27, adder 28, keys 29-31, integrators 32 and 33, comparator 34, one-shot 35 and switch 36. Element 26 via an inverter 27 is connected to one input of the adder 28, to the other input of which element 25 is connected. The output of the adder 28 via the switch 29 is connected to one integrator 32, the other input of which through 58 switches 3.1 connected to the output of the integrator 33. The output of the INTAY1 32 through the switch United Comparator 34, one-shot 35 plug to one of the inputs of the integrator 33. The other input of the integrator 33 is connected to the switch 36 via the key AOR. The control inputs of the keys 29 and AOR are connected in parallel, the EVIOK 3 control contains (Fig. 4) the integrator 37, the comparator 38, one-oscillators 39-41 , And 4244 elements, triggers 45 and 46, inverters 47 and 48. The integrator 37 output is connected to the corresponding input of the comparator 318, the output of which is connected to the inputs of one-vibrator 40 and 41 and And 42-44 elements The output of the one-shot 40 through the inverter 47 is connected to the inputs of the AND element 42 and 43, the output of the one-shot 41 via the inverter 48 is connected to in And 44. The outputs of the trigger 45 and 46 are connected to the corresponding inputs of the elements And 43 and 44, the outputs of which are no / t connected to the inputs of the triggers 45 and 46. The device works as follows. In the process of excavation, the inputs of block 1 are connected via chains 5 and 7: signals I „and I are received proportional to the total currents of the main circuits of the engines of the lifting mechanisms and the piston headboard, 6-8 - signals proportional to the voltages in the same flail x In accordance with the equation MC-M -DCJ-, 1 - Mg-CM g ,,, where 0 is the moment of inertia of the drive (speed and acceleration of the engine; MX, M is the moment of the engine and the moment of rotation no., Constant Gd is the resistance of the core of the electric drive drive, Fy is the magnetic flux of the engine, is the current of the circuit of the core, voltage of the generator and under the condition (p-Ir, F -const, and ffi negligible mapo, at the output The MairopOb 23 and 24 signals are formed with IP And 11. proportional to the static component of the core toxes in lift engines and traction. The signals along circuit 9 and U are fed to block 2 by elements 26 and 25. The modules of the signal modules are received by the modules 28, the output of which produces a signal y - 1 -I., because the signal module 1 is inverted by an inverter 27. The signal yj, goes through key 29 to integrator 32, which implements the following function -2-J i, I and JL signals through the I and 12 circuits, respectively, to the comparator 38 and integrator 37. Ks mmparator 38 is triggered through a lie Hz ..I since at its output the signal is produced when the condition of CStC l In- is fulfilled, where k is the coefficient proportionality. The output signal from the comparator 38 is fed to the inputs of the single vibrators 4O and 41 and the element 42. If the duration t c is longer than the pulse duration of the single vibrator 40, then the output of the electronic terminal 43 turns out to be a signal, the trigger 45 switches and the integration signal ii (the moment of intersection of the buckets of the line I of Fig. 5) goes to the keys 29 and 30, the integrator 32 of block 2 begins to integrate the input signal y, (, and the integrator 33 starts integrating the reference signal UJ or and 2 t coming through the key 30 depending on switch 36 position. And vegachiny 6q to a value greater than the duration of the impulse of the one-shot 41, the element 44 is triggered, resulting in the trigger 45 is switched to the initial state and the trigger 46 is switched, resulting in a signal 2 of the end of integration (the moment the bucket crosses the line I 5). The integrators 32 and 33 stop integrating the primary signals, since the switches 29 and 30 are switched to the non-conducting state. At the same time, the key 31 switches to the conducting state and the signal from the output of the integrator 33 is fed to the input of the integrator .32. Due to the fact that the output signal of the integrator 33 has the opposite sign compared to the signal fed to the integrator 32 through the key 29, the integrator begins to integrate the output signal

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integrator 33 to zero. D) and when the state of integrator 32 is reached, the xsmpparator 34 on its output is triggered by a {signal signal that switches one oscillator 35 and enters 16 in block 4, the output signal of the 1st 35 oscillator 35 switches to the state integrator 33 and switches TjHirrep 46 Since the integrator 33 when NHHTerpHpOBaHHH of the input signal, the output voltage reaches a UROR, proportional to the time tfli -it, then when it is applied to the input of the integrator 32, the segment (. Equal to the average value

Joy In - IT time 2 according to the expression

K2l4-ti) (in-l) dS

and

2t,

j (

With tC

P

KjlVtJUo

where and about - and - when unloading a laden KCSH and a hundred horizons above the horizon,

Ufl- (/ 2 - one hundred percent when unloading a loaded bucket below the horizon;

k l - proportional coefficient.

Claims (3)

1. USSR author's certificate 0 № 32730, cl. E 02 F 9/20, 1969. 2. USSR author's certificate number 446599, cl. E 02P9 / 2O, 1973. 3. USSR author's certificate for application number 2344689/03, cl. E 02p9 / 20i 5 1976. t-1 / 7 P I W W Have f2 2ff -ABOUT Phage.g