SU885836A2 - Device for measuring power primarily of agricultural machines - Google Patents

Description

(54) DEVICE FOR MEASURING POWER

Mostly Drilling Technology The invention relates to a measuring technique and can be used to measure power and other power parameters, mainly agricultural machines. According to the main author. St. 577414, a device is known for measuring the power of extrinsic agricultural machines. This device contains two parallel channels, one of which is made in the form of a displacement sensor, which is connected via a switch to the former and connected in series with a clock generator and a clock counter, and the other in the form of serially connected force sensors, amplifiers, time-amplitude a converter whose starting circuit is connected to an output (driver, and a filling pulse generator, wherein the output of the clock counter is connected to one input of the I circuit, and the other the input of which is connected to the output of the generator filled with pulses, and the output with a digital indicator 1. The disadvantage of this device is the limited functionality of the MACHINE due to the inability to measure the power dispersion and other power parameters.The purpose of the invention is to expand the functionality. due to the fact that a voltage-frequency converter, a digital quadr, a key and an additional digital indicator and circuit I are entered into the device, the first input of which is connected not through voltage-frequency converter with amplifier output, second with amplitude-time converter output, third with clock counter output, and output with direct input of additional digital indicator, with output of main circuit AND through digital quad and control switch which is connected with the output of the clock counter, is connected to the inverse input of an additional digital indicator. The drawing shows a structural diagram of the proposed device. A device for measuring the power of predominantly agricultural machines contains two parallel channels. To the entrance of one of them

A displacement sensor 1 is connected, which the closed contact of switch 2 is connected with the input of the former 3. The output of the latter is connected to the trigger circuit. of the hard-time converter 4. The open contact of the switch 2 is connected to a generator of 5 clock pulses, the output of which is connected to one of the inputs of the AND 7 circuit, the control input of the key 8 and the third input of the additional circuit AND9 through the counter of the second clock And 9 is connected via a voltage-frequency converter 10 to the output of amplifier 11, to the input of which is connected the sensor 12 of the efforts of another channel. The output of converter 4 is connected to the second input of the AND 9 circuit and through the filling pulse generator 13 to the other input of the AND 7 circuit. The input of the AND 7 circuit is connected to the direct input of the digital indicator 14 and through the digital quad 15 and key 8 to the inverse input of the auxiliary a digital indicator 16, the direct input of the latter being connected to the output of an additional circuit AND 9. The digital indicator 14 consists of a serially connected counter 17, a decoder 18 and an indicator 19, and an additional digital indicator 16 of which are connected in series with etchika 20, decoder 21 and display 22.

The device works as follows.

The signal from force sensor 12 (torque) through amplifier 11 is fed to the input of amplitude-time converter 4. Since a displacement sensor 1 (speed) is connected to the input of one channel, it starts through converter 3 with converter 4 with a frequency proportional to the number revolutions At the output of converter 4, pulses appear, the duration of which is proportional to the torque, and the frequency — the number of revolutions, i.e. the total area of the pulses per unit of time is proportional to the average power value for the same time. These pulses trigger a generator 13 for the duration of its duration, whereby a sequence of numbers proportional to the amplitude of torque is generated at the output of the latter, which is fed to the input cxeNta AND 7. The generator 5 pulses arrive at. counter 6, which until its filling forms

. By doing on

output signal

the other input of the circuit is AND 7, the etrt signal permits the passage of a sequence of numbers to the counter 17 of the digital indicator 14 and to the digital quad 15. The number formed in

The counter 17, after filling the counter 6, is the mathematical expectation of the measured power and after conversion by the decoder 18 enters the indicator 19, from which it can be read by the operator.

The number formed at the output of the quad 15 after the filling of the counter 6 is the square of the mathematical: expectation of the measured power.

The signal from the output of amplifier 11 is simultaneously fed to the input of converter 10, the output of which produces a signal with a frequency proportional to the torque. This signal, as well as the signal from the output of converter 4 and counter 6, are fed to the inputs of AND 9 circuit. At the output of the latter, a sequence of numbers is formed, each of which is proportional to the square of the power amplitude. This sequence is fed to the direct input of the counter 20 of the additional digital indicator 16, forming in it the sum of the squares of the power amplitudes. At the moment of filling the counter 6, the signal from its output opens the key 8 and the square of the mathematical expectation of the power of the quad 15 arrives at the inverse input of the counter 20, subtracting from the number contained in it. As a result, a counter proportional to the power dispersion is formed in the counter 20. After being converted by the decoder 21, it is fed to the indicator 22, from which it is also read by the operator. In the case of measuring the dispersion of the power parameter (torque or pulling force), switch 2 is set to the lower (according to the diagram) position.

The use of a digital quad, a key, a voltage-frequency converter and additional And circuits and a digital indicator will allow the device to expand its functionality by allowing measurement of the power dispersion and other power parameters.

Claims (1)

Invention Formula A device for measuring the power of predominantly agricultural machines according to ed. St. 577414, in order to expand its functionality, a voltage-frequency converter, a digital quad, a key and an additional digital indicator and an I circuit are introduced into it, the first input of which is connected via the voltage-frequency converter to the output the amplifier, the second - with the output of the amplitude-time converter, 5 third - with the output of the clock counter pulses, and the output - with the direct input of an additional digital indicator, the output of the main circuit And through a digital quad and key, the control input of which is connected to the output of the clock counter, is connected uMAor additional digital indicator. Sources of information taken into account in the examination.; I; /, r ° P ° USSR certificate 577414, cl. G 01 L 3/24, 21.06.76.