SU748431A1 - Multichannel programme-control device - Google Patents

Description

(54) MULTICHANNEL DEVICE FOR SOFTWARE CONTROL

I

The invention relates to automatic control and is intended for use in numerical control systems for drives of feeds of machine tools.

Devices are known for programmatically controlling the feeds of metal-cutting machine tools, (2.

The device contains a software unit, a read amplifier, a frequency to voltage converter, a frequency generator, a inhibitor valve, a drive control unit, a tunable frequency divider, a synchronization unit, and a reversible counter. The input of the read amplifier is connected to the input of the frequency converter to voltage and, via a synchronization unit, to the input of a counter counter, another input of which is connected to the output of the adjustable frequency divider, the output of the reversing counter is connected to a potential input of the inhibit valve, the pulse input of which is connected to the output of the generator the frequency input last connected to the output of the frequency converter in the voltage, and the input of the tunable frequency divider combined

with the input of the drive control unit and connected to the outlet of the valve 1.

The device contains an interpolator, an automatic acceleration and deceleration device, an irreversible counter, the overflow pulse of which is the signal for the start of deceleration 2.

The closest to the technical essence of the present invention is a device for software control, containing an interpolator, a control channel for accelerated travel, including a controllable generator, two counters accelerated, with controllers, a control unit, an inhibit valve, and 5 dinat, OR elements, and the inputs of the entry of counters of accelerated travel are connected by the corresponding coordinate outputs of the interpolator, the outputs of the detectors are connected to the inputs of the control unit, two outputs of which are Uniform with controllable pulse generator, and a third output controlling unit is connected to a control input of the valve prohibition mining. The output of the controlled pulse generator is connected directly to the counting input of the accelerated stroke counters, and over: | coordinate valves, OR elements, the valve of the prohibition of working off to the inputs of the control unit by stepper motors. The output of the controlled pulse generator can be connected to the counting inputs of the counters of accelerated travel through a 1-point divider (c). Respectable devices have limited functionality, namely: tremcordinagaya control: from one controlled generator it is not possible to perform high-speed machining at high speeds, which reduces the power of the CNC; {numerical control devices); There is no possibility of controlling the frequency, acceleration and deceleration time of the drives in the dynamics according to the interpolator program, since there is no connection between the controlled oscillator and the interpolator; lack of feedback between the counter; The accelerated travel and the interpolator do not allow controlling the development of a given movement at high speeds, and, moreover, the lack of feedback on the position of the stepper motor shaft reduces the accuracy and reliability of the device. The purpose of the invention is to expand the functionality of the device and the loss of its accuracy and reliability. It is achieved by the fact that a multichannel device for software logging containing an interpolator and in each control channel counters of the ramp and braking path {and, the first inputs of which are connected respectively to the first and second outputs of the interpolator, and the second inputs. dy - to the third output of the interpolator, and a series-connected controlled oscillator; the acceleration stop valve, the first OR element, connected by another input to the fourth output of the interpolator, the control unit and the stepping motor, are introduced in each control channel to; 1yuch, the code register, the decoder, the first trigger and the And element and the second element OR connected in series, the second trigger and the second element I, whose INPUT is connected to the third, to it is input to the counter of the acceleration path, and the second input is to the first input of the first element of Inc. to the output of the key connected by the first input to the output of the controlled Generator, the second input The first element I is connected to the second inlet of the accelerated development inhibit valve and to the output of the first trigger, and the output to the third input of the braking path counter, the output of which is connected to the HH input of the torus and to the first input of the first trigger connected to the second input of the first decoder of the decoder, the first input of the second OR element and the output of the acceleration coup counter, and the third input of the second OR input, the third output of the interpolator and the first input of the code register, the second input of which is connected to the second row interpolator, and the output - to the input of the controllable oscillator via the decoder, the third input coupled to a sixth output of the interpolator and to a second input of the second flip-flop, and .tem that each channel ;; The control has a position sensor, the input of which is connected to the stepper motor, and the output is connected to the solenoid input .11K) of the given channel. The motor is controlled by the signals of a controlled generator, the mode of operation of which is determined by the interpolator program (calculator), and the output signals of the position sensors are fed to the subtractive inputs of the acceleration or deceleration path counters. FIG. 1 shows a functional diagram of the device; in fig. 2 - timing diagrams explaining the principle of its operation.-.- V.:, .. -. The device (see Fig. 1) contains an interpolator 1, control channels 2, first input 3 c4et4HKa of the overclocking path, first input 4 of the CALCULATION of the trip path: neither, second input of the 5th code register, counters B, 7 of the acceleration and deceleration path, register 8 code, the decoder 9, vfoy element 10 OR, the first trigger 11, controlled generator 12, the second trigger 13, the first element 14 And, the valve 15 prohibition of accelerated testing, the element 16 And, the first | 17th element OR, block 18 controls, stepping motor 19, position sensor 20 and key 21. In FIG. 2, signal 22 is indicated. Acceleration, time diagram of 23 signals .. at the output of trigger 13, time diagram of 24 signals at the output of t of the generator 11, time diagram 25 of changing the frequency of the output pulses of the generator 12, output signal 26 of the counter 6 acceleration path, counter output 27 7 ways of braking and signaling 28 "Reset. The device works as follows. After the signal "Reset from interpolator 1" is sent, each channel 2 is set to its initial position, at which the counters 6, 7 of the acceleration and deceleration paths are disconnected, the register 8, the triggers 11 and 13 are set to zero, resulting in the outputs of the elements 14 and 16, a single potential is established. When specifying accelerated movements, interpolator 1 provides information in the form of a binary code to counter 6 about the acceleration path, to counter 7 - about the braking path, and to register $ -: about speed, acceleration and deceleration time. With a delay after recording, the signal "Acceleration, which weighs the trigger 13 and simultaneously through the decoder 9 turns on the generator 12, the frequency of which pulses varies according to matches; with the code recorded in the register 8 (Fig. 2 column. 25). The output signals of the generator 12 are received through the element. 16 per subtractor

$ the input of counter 6 and at the same time through valve 15, as well as through element 17 OR to the input of block 18. After zeroing the counter b, the transfer signal from the output of counter 6 ("On acceleration") triggers trigger 11 and simultaneously through the decoder 9 switches the operation mode of the generator 12 on slow mode. At the same time, the signal “On acceleration through element 10 OR resets the trigger C to the outgoing state, prohibiting the passage of signals from generator 12 to the subtracting input of counter 6. The output of trigger 11 permits the passage of generator pulses 12 through element 14 to the subtracting input of counter 7. After zeroing the counter 7, the transfer signal "On deceleration" enters interpolator 1 as information on the execution of a given movement and simultaneously resets trigger 11, thereby prohibiting the passage of signals from the output of generator 12 to the subtracting input register 7 through element 14 And to the input of block 18 through valve 15. A new control cycle of a high speed drive can be carried out after reading information in the counters (b and 7 and in register 8 and when the new signal is received. Overclocking from interpolator 1. Control The quick strokes of each motor 19 independently of each other according to the program of the interpolator 1 allow for planar processing at fast strokes. The drives are controlled at low speeds directly by the signals of the interpolator 1, which through the elements 17 OR If the Sensor 20 / POSITION is connected, the signals arriving at the subtractive inputs of the counter: b or counter 7 are taken from the outputs of sensor 20 according to the position of the rotor of the corresponding stepper motor 19. Signals from the output of the generator 12 in this case arrive through valve 15 only to the input of the corresponding block 18. In this case, we obtain a closed tracking system for controlling stepper drives at high speeds, which allows us to increase the reliability and accuracy of working out the specified displacements. Thus, in the proposed device, the coordinates are controlled during contouring at high speeds, i is controlled by an interpolator program by the mode of operation of the controlled pulse generator, increasing reliability and accuracy due to the introduction of feedback on the position of the rotor of the stepper motor. The device allows, by expanding the functionality, to improve the productivity of the machine, as the counter processing speed is increased.

Claims (3)

748431 claims. A multichannel software control device containing an interpolator and, in each control channel, counter acceleration and deceleration paths, the first inputs of which are connected respectively to the first and second outputs of the interpolator, and the second inputs to the third output of the interpolator, and sequentially connected controlled generator, an accelerated testing inhibit valve, the first OR element connected by another input to the fourth output of the interpolator, a control unit and a stepper motor, characterized in that, in order to expand the In the device’s functional capabilities, a key, a code register, a decoder, the first trigger and the AND element and the second OR element, the second trigger and the second AND element, whose output is connected to the third input of the acceleration path and the second input to the the first input of the first element of the output of the key connected to the first input to the output of the control generator; the second input of the first element I is connected to the second input of the acceleration inhibit valve and the output of the first trigger, and stroke - with the third input of the counter-deceleration counter, the output of which is connected to the interpolator input and to the first input of the first trigger connected by the second input to the first input of the decoder, to the first input of the second OR element and to the output of the acceleration path counter, and the third input to the second input of the second element OR, with the third output of the interpolator and with the first input of the register of the code, the second input of which is connected to the fifth output of the interpolator, and the output to the input of the controlled generator through a decoder connected by the third input from the poles m output of the interpolator and with the second input of the second trigger. 2. The device according to claim 1, characterized in that, in order to increase the accuracy and reliability of the device, a position sensor is inserted into the control channel, the input of which is connected to the stepping motor, and the output to the second key input of the given channel. Sources of information taken into account 1FI examination 1. USSR author's certificate № 336647, cl. G About 19/18, 1970. 2. USSR author's certificate number 195532, cl. G 05 G 21/00, 1963. 3. USSR author's certificate Ke 434380, class, G 05 V 19/18, 1972 (prototype): I .11 L: jtb -J- © zT ° go fig. (