SU572763A1 - Numeric program control apparatus - Google Patents

Description

one

The invention relates to automation and computer technology and is intended for use in metal sections and their numerical control (PMC) packs.

It is known a device for phase-to-pulse CNC type used in machines equipped with feed-controlled drives 1. However, the lime device has a small, equal to the sensor pitch, linearity zone, the error-speed characteristic, which limits the maximum frequency difference developed by the drive. The closest technical solution to the invention is a device for numerical control, containing its program setting block, the first and second outputs of which are connected to the corresponding inputs of the reversible counter, the output of which is connected to the input of the drive, the addition – subtraction unit, the first input of which is connected to the third the output of the program setting block, and the output to the input of the frequency divider, the first output of which is connected to the first input of the first trigger, the second output to the second input of the first and second triggers The first input of which is connected to the output of the phase-pulse feedback sensor 2. This known device is characterized by the complexity of matching the computer and the digital indication of the actual position of the machine actuators and the need for filters to isolate a constant component of its signal, since the output The system signal is pulse-width modulated pulses, resulting in a faster response time. In addition, in the device a single noise at the input of the reversible counter-drive leads to an error equal to the sensor pitch, which reduces

its reliability.

The purpose of the invention is to increase speed and reliability. In the described device, this is achieved by the fact that it contains

additionally two elements And, the first input of the first element And connected to the first output of the first trigger, the second input to the first output of the second trigger, and the third input connected to the third output

the program setting block and the first input of the second element I, the second input of which is connected to the second output of the first trigger, and the third input to the second output of the second trigger, the output of the first element I plug into the second input of the addition block - subtraction and the third input of the reversible counter, and the output the second element And the keys to the third input of the addition unit - subtraction and the fourth input of the reversing

counter.

The drawing shows the block diagram of the described device.

The OIO contains a program setting block 1, an addition-subtract block 2, a frequency divider 3, a phase-shift feedback sensor, 4, triggers 5, 6, elements 7 and 8, and a reversible counter 9 connected to the drive 10. The inputs of the "1 The first 5 and second 6 flip-flops are connected respectively to the output of frequency divider 3 and feedback sensor 4, and the inputs of the “O are combined and connected to the intermediate output, respectively N”

impulse divider, where N -

divider capacity. The outputs of the flip-flops are connected to the first and second inputs of the AND elements, the third inputs of which are combined and connected to the clock output of the program setting block, and the outputs are connected to the corresponding inputs of the reversible counter 9 and the addition-subtraction block 2.

In the initial state, when the program pulses are absent, the frequency divider 3 through the addition-subtraction unit 2 is filled with clock pulses from the output of the program setting unit 1. At the outputs of the divider, two sequences of pulses are shifted in phase by / 2 periods. One sequence of pulses is fed to the input of the installation “1 trigger 5, the other - to the inputs of the installation“ About both triggers.

The triggers are used to compare the phase of the sensor 4 signal with the overflow signal of the divider 3, and when the phase unbalance is zero, they work in phase.

Since the inputs of the AND elements receive signals from the direct output of one trigger and from the inverse output of another, the AND elements are closed. When a program pulse arrives, for example, at the summing input of the reversible counter Q, a control signal is generated at its output and acceleration of the actuator 10 begins, which is kinematically connected with feedback sensor 4. At the same time, the sensor signal overtakes the splitter overflow signal, and at the inputs of the element And 8 there is a coincidence of the codes “1. Element I is opened and clock pulses are allowed to the subtracting input of the reversible counter 9 and to the summing - addition-subtraction unit 2. The arrival of each pulse causes the phase of the overflow pulse of the divider to shift to Vv part of the period, thus providing automatic tracking of the overflow pulse phase signal sensor. The number of pulses B at the output of the element And 8 corresponds to the amount of movement of the executive body of the machine. The arrival of program impulses to another input of a reversible counter leads to unlocking the element 7.

Further operation of the device proceeds 0 in the same way.

Thus, the use of the described device to control the machine can significantly improve the performance of the latter. five

Claims (2)

1. USSR author's certificate No. 344416, cl. G 05B 19/18, 1970. 2. USSR author's certificate number 424118, cl. G 05B 19/18, 1972. 1 7 k  s