SU383426A1 - MANAGEMENT SYSTEM OF WORKING PROCESS OF GRAIN BREAKING MACHINE - Google Patents

Description

one

The invention relates to agricultural machinery and can be used on grain harvesters and other harvesting machines.

Devices are known for controlling the work process of the harvesting machine, comprising a sensor for the flow of grain entering the hopper connected to an integrating device that interacts with the sensor of the path traversed by the machine.

However, such devices do not provide a sufficiently reliable estimate of the efficiency of the workflow, since to match the time of the harvested site and the constant value of the transport lag time is introduced, while in reality it is not constant and depends both on the operating mode combine, and from external factors.

The aim of the invention is to improve the accuracy of the evaluation of the control effect by eliminating errors due to inconsistency in transport lag and yield fluctuations.

This is achieved by the fact that the proposed system contains an indicator of the change in the efficiency of the controlled workflow, performed, for example, on an algebraic adder connected to the output of an integrating flow meter of the ground grain.

2

through the elements of continuous memory, unpailed by a common clock generator through a block of consecutive delays, and switched by means of an element or with a trigger controlling the reset of the integrator.

FIG. 1 shows the proposed system for managing the workflow of the harvesting machinery, a block diagram; in fig. 2 - the same, the structural scheme; in fig. 3 - the same

schematic diagram; in fig. 4 - the same, cyclogram of work.

The proposed sensor (see Fig. 1) contains: meter 1 grain consumption, connected to the integrator 2, one output of which

via the signal storage unit 3 is fed to the indicating device 4, and the second to the efficiency indicator 5, which controls the integration time; 6 way gauge with 7 reference driver

pulses acting on the setting device 8 of the feed of the grain mass into the thresher.

The efficiency change indicator 5 includes (see Fig. 2) a block 9 of repeaters of the current integration result associated with memory blocks 10 controlled by a common generator // ticks via triggers 12, 13 with separate inputs connected in series delays: discrete algebraic adder 14

Comparison of three time shifted signals, whose output through the OR / 5 element is applied to the flip-flops 16 and 17, which reset the integrator and the memory elements to zero. The path meter 6 includes (see Fig. 3) a measuring wheel 18 with a cam chopper / I converter 20 of the number of pulses into pressure, the output of which, corresponding to a given number of revolutions of the measuring wheel, is fed through the power amplifier 21 to the input of the actuator 22 of the bread feeder the masses controlled by the trigger 23. The latter is covered by the retransmission feedback consisting of throttles 24, tank 25, valves 26, 27 and accumulative tank 28. In this case, the actuator actuator 22 is formed with the trigger 23 or reference pulses. To put the measuring wheel into operation, a pneumatic cylinder 29 is used, fed through the setting device 30 and the toggle switch 31. The control system works as follows. At the beginning of operation, the circuit is powered on, as a result of which the measuring wheel 18 of the track meter 6 comes into contact with the floor surface and, rotating, sends pressure pulses P to the converter 20. Simultaneously, the integrator 2 is also started, but because the presence of a transport lag, the grain has not yet arrived at the meter / flow input, then the integrator output Sc (see Fig. 4) continues to remain zero. After the time t expires, a grain begins to flow into the meter / flow, and at the integrator output a signal appears that characterizes the growing total amount of grain entering the bunker during time t. Simultaneously, the signal through the repeaters of block 9 passes into all three memory blocks 10 (BPU BP2 and BPZ) and is stored in order and VP1, then after time equal to D, BP2 and, finally, in BPZ. Duration Af is given by the clock generator. After flushing trigger 17, which controls the storage of signals in the last BPZ memory block, all three signals (, qz and dz are fed to the input of the adder 14, which implements expression (I). If two grains are equal and arrive at successive intervals equal to At, q2-gi q3-q2 (P) (Qn graph of Fig. 4), which indicates that the efficiency level of the process is unchanged, i.e., the equality of neighboring quanta (shaded through one on the graph of the current grain q, bunker harvesting machine.) Thus, if qz-qi qs-qz or, which is the same, 2/2-qi- ((see I), then at the output of the comparison element of adder 14 a zero appears that does not change the positions of the flip-flops 12, 13, 16 and 17, n integration continues. If at the next summation it turns out that (i.e. 2 (, which indicates the inequality of two neighboring quanta, i.e. a change in the efficiency of the workflow, the unit appears at the output of the accumulator 3 signal storage, and ensures its fixation on the indicating device 4 until the next change in the efficiency level of the signal Cessa. At the same time, the memory blocks 10 and the integrator 2 itself are reset to zero, as a result of which the circuit is prepared for a new efficiency evaluation cycle that occurs when a new control action is applied in the form of a change in the nominal value of a single-grain feed mass. The latter is provided by the path meter 6, which interacts with the reference pulse shaper 7, and proceeds as follows. The signal from the measuring wheel 18 (Fig. 3) after each revolution enters the converter of the number of pulses into pressure P, which is adjusted to the limiting value P corresponding to a given number of revolutions of the measuring wheel (for example, 10 vol.), I.e. . Upon reaching this limiting pressure, i.e. upon reaching. at the output of valve 26 () of the converter, a unit appears which, through the trigger 23 with separate inputs and the power amplifier 21, moves the actuator 22, abruptly changes the supply for the AG time equal to the time constant of the feedback feedback of the trigger 23 formed by the adjustable throttle 24 and with a capacity of 25. After that, all the elements of the gauge are returned to the initial state, and the integration of the flow rate of grain coming from the area specified in this way continues until a new reference pulse appears at the entrance to the bun a ker in the form of a change in the consumption of grain, which is detected in an iSanic way by an indicator 5 of a change in efficiency. Further, the cycle of measuring the efficiency of workflow management is repeated. The subject matter of the invention 1. A process control system for a grain harvesting machine consisting of an integrating grain flow meter, a track meter, a computing device and a secondary device, characterized in that, in order to improve the accuracy of the process control effect estimate by eliminating faults due to inconsistency of the transport delays and productivity fluctuations, the system contains an indicator of the change in the efficiency of the managed workflow, performed, for example, on algebraic mmatore connected to the output of the integrating flowmeter elements through crop is continuous memory controlled by the common generator cycles through successive delay unit, and by switching OR gate with the trigger, the control the integrator reset.

2. System by n. 1, characterized in that, in order to ensure the case matching of the total integration time of the quantity

of the obtained grain with the size of the area removed during the control cycle, the track meter is connected to a pulse-to-pressure transducer, whose output through a valve controlled by a trigger covered by delayed feedback is fed to the input of the actuator of the grain mass feed unit and forms the reference driver pulses on the consumption of the resulting grain.

((

  W W-W HH to)

Fig

Fig 2