SU1375171A1 - Apparatus for measuring rotation of working members of farm machine - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to agricultural machinery, in particular, to process control devices. The purpose of the invention is to increase the reliability of work. The device contains a multichannel circuit 1 control. Each channel of the circuit 1 is formed by the sensor 2 of the control unit of the working body, which is connected to the input of the threshold device 3. The output of the latter through the counter 6 pulses is connected to the light indicator 8. The audio alarm element 14 is through the OR 12 element and the key 13 is connected to the counter outputs of 6 all channels. The output of the pulse sensor 11 frequency vrash.en the shaft of the engine of the machine through the element I. 7 is connected to the clock input of the corresponding counter 6 pulses. The threshold device 3 of each channel is formed by a pulse counter 4 and a shaper 5 of a parallel code. The reliability of operation of the device is increased by automatically changing the threshold of operation synchronously with the change in the frequency of the shaft turn of the engine of an agricultural machine. 1 hp f-ly, 1 ill. (BUT)

Description

with SP

FIELD OF THE INVENTION The invention relates to agricultural machinery, in particular, to devices for controlling the technological process of agricultural machines.

The purpose of the invention is to increase the reliability of the device.

The drawing shows a block diagram of the device.

The device for controlling the rotation of the working parts of the agricultural machine of the content of the pulse period at the output of the sensor 11.

Pulses coming from the output of the sensor 11 to the clock input of the counter 4, reduce its content.

Under normal machine operation, when the frequency F of the pulses at the output of sensor 2 is above the threshold frequency FM, i.e. T: T, during T 1 / F, the number of pulses less than N comes to the input of counter 4,

There is a multichannel circuit I control. 10 therefore, at the output of the transfer of counter 4 cox- Each control channel is formed by a logic level zero. With com 2 control of the working body, which this lamp 10 is off, and the key 13 generates pulses with a frequency, it is proportional to open, which indicates the normal rational angular velocity of the working or-machine operating mode, a ghana (not shown), and a threshold device -When reducing the angular velocity of the countergrip 3, includes a counter of 4 pulses and a liable working body, for example, due to

when the drive belt slips due to overloading of the working element, the frequency F of the pulses at the output of sensor 2 decreases. When this frequency reaches the threshold of the threshold (output P) of the counter 4, the And 7 element is of the 20th value, i.e. T Tp, the contents and the light indicator 8, turn on trans- meter 4 at the next cycle, subtractor 9 and the lamp 10. The first inputs of the elec- tron are zero. At the same time, at the output of Pieces I 7 are combined and connected to the counter 4, briefly, the logizer 5 of the parallel code appears. In addition, each control channel includes a pulse counter 6, the installation input of which (input R) is connected to the output output of the pulse sensor 11 of the frequency of the turning of the motor shaft of the machine, which generates pulses with a frequency proportional to the angular velocity of the shaft of the motor cars. The outputs of elements AND 7 are connected to the inputs of the element OR 12, the number of inputs of which is determined by the number of control channels.

The output of the element OR 12 is connected to the control of the lower input of the key 13. The sound alarm element 14 is connected via the key 13 to the power bus 15. The parallel code generator 5 is a permanent storage device, for example, of a matrix type, the outputs of which are connected to the bit inputs DI - 0 by the counter 4.

The device works as follows.

The parameters of the sensor 11 is selected so that

35

ical unit setting counter 6 to zero. At the inverse output of the last bit of the counter 6, a logical unit is set which prepares the element 7 to pass pulses from the sensor 11 to the clock input of the counter 6 and the input of the element OR 12. The element 7 also transmits the pulses until in the last discharge of the counter 6 a unit blocking element AND7 will not be established. Thus, at the output of counter 6, a pulse of duration m T9 2 is formed. The number of bits To counter b is chosen so that m 1 H- 2 s. Thus, when a violation occurs, a pulse from the output of the element And 7 passes through the element OR 12 and periodically closes the key 13, triggering the element 14 of the audible alarm.

when the engine is operating in a nominal value of 40, which generates an audio sounding number mode, the frequency of the pulses at the output signal. At the same time, the pulse from the output of sensor 11 lies in the sound-frequency range and the last digit of counter 6 through 800-1200 Hz. After turning on, the transistor 9 is turned on for the lamp in the last discharge of the counter 6 and pa 10, indicating the number of the working impulses from the output of the sensor P. that has passed through, in which the violation occurred through element I 7 , a work logic is established, a physical unit. At the same time, the logical zero level, taken from the inverse output of the last discharge of counter 6, prevents further passage of the imP after elimination of the disturbance, the output P of counter 4 again sets the logical zero, and the output of the last

pulse through the element I 7 to the clock input of the discharge, the counter 6 - the logical zero, the counter 6. switching off the lamp 10 and the element 14 by the sound pulses from the output of the sensor 2 in the counter alarm.

Chick 4 is periodically entered the number N, available, at the output of the driver 5. The number is chosen from the condition

. ,(one)

where Tm is the period of the threshold frequency Fn, at which the alert signals are generated;

From relationship (1) it can be seen that the period of the threshold frequency changes synchronously with the change in the period of the pulse 55 at the output of the sensor 11.

Taking into account that Fn 1 / T and the ratio (1), get

Fn Fg / N. (2)

TC-period pulses at the output of the sensor 11.

Pulses coming from the output of the sensor 11 to the clock input of the counter 4, reduce its content.

Under normal machine operation, when the frequency F of the pulses at the output of sensor 2 is above the threshold frequency FM, i.e. T: T, during T 1 / F, the number of pulses less than N comes to the input of counter 4,

five

ical unit setting counter 6 to zero. At the inverse output of the last bit of the counter 6, a logical unit is set which prepares the element 7 to pass pulses from the sensor 11 to the clock input of the counter 6 and the input of the element OR 12. The element 7 also transmits the pulses until in the last discharge of the counter 6 a unit blocking element AND7 will not be established. Thus, at the output of counter 6, a pulse of duration m T9 2 is formed. The number of bits To counter b is chosen so that m 1 H- 2 s. Thus, when a violation occurs, a pulse from the output of the element And 7 passes through the element OR 12 and periodically closes the key 13, triggering the element 14 of the audible alarm.

From relationship (1) it can be seen that the period of the threshold frequency changes synchronously with the change in the period of the pulse 55 at the output of the sensor 11.

Taking into account that Fn 1 / T and the ratio (1), get

Fn Fg / N. (2)

The frequency at the output of sensor 11 is proportional to the frequency of rotation of the motor shaft RDV, i.e.

Fg Ko Rdv,

where Ko is the coefficient of proportionality. With this in mind, relation (2) takes the form

R"

 TO,

. NW)

From relation (3) it can be seen that the threshold frequency of the control device is proportional to the frequency of rotation of the motor shaft. This makes it possible to use the device to control the operation of agricultural machines, in which the frequency of rotation of the motor shaft

ten

To improve the reliability of operation, it is equipped with a pulse frequency sensor of the motor shaft of the machine, and each control channel is equipped with a pulse counter and an element, the first input of which is connected to the output of the pulse counter and the light indicator input, the second input is connected to the output of the pulse shaft speed sensor the machine and the second inputs of the threshold devices of all control channels, and the output is connected to the clock input of the pulse counter and the corresponding input of the OR element, while the installation input is the account ika im20

pulses connected to the output of the threshold

Significantly changes in the process of their operation, the device, the first input of which is connected. It is also seen that in the process of acceleration, the output of the sensor of the control of the working body, and the output of the OR element is connected to the element of the audible alarm through a controlled key.

2. The device according to claim 1, characterized in that the threshold device of each channel is made in the form of a pulse counter and a parallel code generator, the outputs of which are connected to the discharge inputs of the pulse counter, the recording input l, each channel of which contains a sensor 25 imipulse is connected to the output of the control of the working body control, the threshold sensor of the control of the working channel, as well as the device, the light indicator, the sound input element - with the pulse output

alarm, controlled key and motor shaft rotation frequency sensor

The element OR, characterized in that, with the price.

During the period of its activation, the monitoring device does not generate any warning signals.

Invention Formula

1. A device for controlling the rotation of the working bodies of an agricultural machine, including a multichannel control circuit

To improve the reliability of operation, it is equipped with a pulse frequency sensor of the motor shaft of the machine, and each control channel is equipped with a pulse counter and an element, the first input of which is connected to the output of the pulse counter and the light indicator input, the second input is connected to the output of the pulse shaft speed sensor the machine and the second inputs of the threshold devices of all control channels, and the output is connected to the clock input of the pulse counter and the corresponding input of the OR element, while the installation input is the account ika them

Claims (2)

Claim 1. A device for monitoring the rotation of the working bodies of an agricultural machine, including a multi-channel control circuit, each channel of which contains a sensor for controlling the working body, a threshold device, a light indicator, an audible alarm element, a controlled key and an OR element, characterized in that, in order to increase reliability work, it is equipped with a pulse sensor of the rotational speed of the motor shaft of the machine, and each control channel is equipped with a pulse counter 5 s and an element And, the first input of which is connected to the output of the counter pulse and the input of the indicator light, a second input connected to the output pulse frequency of rotation of the sensor shaft of the machine motor and the second inputs of the threshold devices ^υ all control channels, and an output coupled to the clock input of the pulse counter and the corresponding input of the OR gate, wherein the adjusting input of the pulse counter is connected to the output of the threshold device 15, the first input of which is connected to the output of the sensor for monitoring the working body, and the output of the OR element is connected to the sound alarm element through a controlled key h 2. The device according to π. 1, characterized in that 20, the threshold device of each channel is made in the form of a pulse counter and a parallel code generator, the outputs of which are connected to the discharge inputs of the pulse counter, while the input of the recording 25 of the pulse counter is connected to the output of the working channel monitoring sensor, and the clock input the output of the pulse sensor of the engine shaft speed.