SU1734074A1 - Device for control of multiposition object - Google Patents

Abstract

The invention relates to automatic control and can be used in control systems of metal-cutting machines for automatic rotation of the workpiece. The purpose of the invention is to increase reliability and simplify the design. The device contains two inductive sensors 5 and 6 for determining even and odd processing positions, as well as a current relay 8 installed in one of the phases of the electric motor 4, power supply 10, program setting block 11, two amplifying blocks 12 and 13 with interlocking, counter 14 , four elements And 15-18 and elements 1/1 19-28 by the number of processing positions, five elements OR 29-33, pulse element 34, two temporary elements 35 and 36, two elements 37 and 38 of memory, sensor 39 upper position pintles. The memory element 37 consists of two elements OR-NO 40 and 41, and the memory element 38 consists of sensors OR-NO 42 and 43. The program setting unit 11 includes three elements OR, a switch, two delay elements, two pulse formers , toggle switches and LED 6. eaten with

Description

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The invention relates to automatic control and can be used in control systems of metal-cutting machines for automatic rotation of the workpiece.

A known system for automatically controlling the position of a part in a rotating rotary chuck mounted in the body of a machine spindle head, including a position sensor for a part fixed in a cartridge, an auto-synchronous generator, in the passive part of which consists of an inductor and a block of capacitors, the part position sensor is on the capacitor unit is installed in the cartridge, and the inductance coil of the passive part is mounted on the end of the cartridge facing the head of the spindle head, which is coaxial with the above m-mentioned active portion fixed coil inductance of the generator coil.

The closest in technical essence to the invention is a software control system for selecting a tool, comprising a program setting block, a code register, a comparison block, a control trigger, a drive, a main and additional stop count sensors, flags, a tool store, an initial setting sensor, normalizing converters, counting pulse shaping unit, code counter and display unit.

The known system is characterized by considerable complexity, since the unit for forming the counting pulses is the hardest of all the proposed devices, and, consequently, insufficient reliability in operation.

The purpose of the invention is to simplify the design and increase reliability,

The goal is achieved by the fact that four AND elements and AND element groups by the number of processing positions, five OR elements, two are entered into the device for controlling a multi-position object containing a program setting block, an AC reversible electric drive installed in the head, a group of sensors for determining processing positions. pulse generator from a potential signal, two delay elements, a current relay connected to one of the drive phases, a sensor for fixing the head, a sensor for the top position of the quill, the output of which is connected with the signal input of the program setting block, the setup output of which is connected to the installation input of the initial state of the counter, the group of outputs for enabling operation of the program setting block is connected to the first inputs of the group of elements AND, others

the outputs are connected respectively to the first inputs of the first and fourth elements And, to the first inputs of the second and third elements And, to the enable input of the first

memory element to the permitting inputs of the fourth and second sensors, the outputs of which are connected to the corresponding inputs of the first OR element, the output of which is connected to the input of the first shaper

impulses from a potential signal, the output of which is connected to the second inputs of the first and second elements AND, the output of the first element AND connected to the first input of the second element OR, and the output of the second element AND connected to the counting input of the pulse counter, information outputs of which are connected to the second inputs of elements AND the groups whose outputs are connected to the group of inputs of the second element OR,

the output of which is connected to the first installation input of the first memory element and with the switching input of the second memory element, the second inputs of the third and fourth elements I are connected to the input of the first

memory element, and their outputs are connected respectively to the inputs of the first and second delay elements, the outputs of which are connected to the corresponding inputs of the third OR element, whose output

connected to the input of the second memory element, to the input of the indication of the task block and programs, and to the first input of the fourth OR element, the second input of which is connected to the output of the second pulse generator from a potential signal whose inputs are connected to a power source, and the output of the fourth OR element is connected to the third inputs of the first and second memory elements, the outputs of the first and second

the memory elements are connected to the drive inputs, the relay outputs of the block and the sensor of the moments of fixation of the head are connected to the inputs of the fifth OR element, the output of which is connected to the fourth input of the second memory element.

Fig. 1 shows an automatic multiple position head; figure 2 is a toothed disk inductive sensors; fig.Z - functional diagram of the device; 4 is a program setting block.

The automatic multi-positioning head 1 is an electromechanical device for one-sided direction of rotation of the working disk 2 with the workpiece 3, having a certain number of fixed positions. In the head 1 is installed reversing motor 4 AC.

When the drive is switched on directly, the drive disk 2 is unlocked and rotated, for example, counterclockwise. When the drive is switched on reversely, the working disk 2 is fixed at the required position. The workpiece 3, mounted on the working disk, requires, for example, radial processing with a rotating tool mounted in a cartridge (not shown). Workpieces can be of at least three types: first, when sequential processing is required at odd fixed positions; second, when sequential processing is required at even fixed positions; the third, when sequential processing is required at both even and odd fixed positions. It is possible to skip positions where processing is not provided.

A device for controlling an automatic multi-position head 1 comprises inductive sensors 5 and 6 for determining even and odd processing positions.

The sensors 5 and 6 are fixed at the end of the head housing and interact with the toothed disk 7 fixed to the axis of the head 1. The toothed disk 7 has slots in the zones under the teeth, forming sectors A and B. Sensor 5 interacts with sectors A of disk 7 and sensor 6 interacts with sectors B of disk 7.

The device for controlling the head 1 contains a current relay 8 installed in one of the phases of the electric motor 4, the sensor fixing moment 9 of the head, the power supply 10, the program setting block and two amplifying blocks 12 and 13 with interlocking, the outputs of which are connected to the windings of the electric motor 4 The device contains a counter 14, four elements AND 15-18 and elements AND 19-28 according to the number of processing positions, five elements OR 29-33, a pulse element 34, two temporary elements 35 and 36, two elements 37 and 38 of memory, sensor 39 upper position quill.

The memory element 37 consists of two elements OR-NO 40 and 41, and the memory element 38 consists of the elements OR-NO 42 and 43.

The output of the sensor 39 of the upper position of the quill is connected to one of the outputs of the program setting unit 11, the outputs of which are connected to one of the inputs of the counter 14, to the first input of the first memory element 37 and the first inputs of AND 15-28 elements. The outputs of the sensors 5 and 6 determine the processing positions connected to the inputs of the first element OR 29, the output of which is connected to the inputs of the pulse element 34, the output of which is connected to the second inputs of the first and second element And 15 and 16. The output of the element 15 is connected to one of the outputs of the second element IL 30 and the output element AND 16 is connected to another input of counter 14,

the outputs of which are connected to the second inputs of the AND 19-28 elements selected by the number of processing positions, the outputs of which are connected to the other inputs of the second element OR 30, the output of which is connected to

0 by the third input of the first memory element 37 and the first input of the second memory element 38. The second inputs of the third and fourth elements And 17 and 18 are connected to the output of the first memory element 37, and their outputs

5 are connected respectively to the inputs of the first and second time elements 35 and 36, the outputs of which are connected to the inputs of the third element OR 31, the output of which is connected to the fourth input of the second memory element and the first input of the fourth element OR 32, the second input of which is connected to the source output 10 power, and the output with the second inputs of the first and second elements 37 and 38 of the memory. The outputs of the first and second memory elements 37 and 38 are connected to the first inputs of the first and second amplifying unit 12 and 13, respectively. The output of the current relay and the output of the moment of fixation of the head 9 are connected to

0 inputs of the fifth element OR 33, the output of which is connected to the third input of the second memory element 38 and to another input of the program setting unit 11.

Memory elements 37 and 38 contain

5 two elements OR-NOT 40 and 41, 42 and 43. In each element 37 and 38 of the memory, the first input of the first element OR-NO 40 and 42 is connected to the first input of the corresponding memory element, while the output of the first memory element is connected with the first input of the second memory element. The second input of the first element OR is NOT connected to the output of the second element OR NOT and to the output of the corresponding memory element.

5 The remaining inputs of the second elements OR — NO 41 and 43 in each memory element are connected to the corresponding input of the memory element.

The program setting unit 11 (FIG. 4) includes three elements OR 44, 45, 46, switch 47, delay elements 48 and 49, impulse drivers 50 and 51, toggle switches 52, 53 ... 61, LED 62.

The device works as follows.

Suppose that the workpiece must be processed sequentially, for example, at five odd positions (1, 3, 5, 7, 9). Set the switch 47 (figure 4) in the first position. After turning on the power, the pulse shaper produces a pulse, which through the OR element 32 enters the first fault inputs of the memory elements 37 and 38. The memory elements are set to the states in which the potential at the outputs is equal to the logical distance.

At the same time, a potential appears at the output of the element OR 44 and the enable input of the sensor b with a logic level of 1. In this case, the sensor 6 is turned on, as there is a window in the disk 7 at this moment. Then, after a time delay of 0, 2, determined by element 48, the output of the program setting block is a signal that arrives at the first inputs of elements AND 16, 18. This state is initial. At the command of an electrical equipment, such as a drilling machine, spindle drives and machine quill heads are turned on, quill lowering and drilling of the workpiece at the 1st position begins (spindle drives, quills and their connections are not shown). After the workpiece is finished in the first position, the machine quill rises up and communicates to the sensor 39 of the top position of the quill. When this command from the sensor 39 is fed to the input of the device 11 and the input of the imaging unit 51 pulse. A pulse former 51 generates a pulse of a duration of 0.1 s, which from the output of the former and device 11 enters the switching input of the memory element 37. The memory element 37 switches to a state in which a signal with a logic level 1 appears at its output and input to the amplifying device 12. Amplifier 12 and motor 4 are turned on, the unlock and rotation of the work disk 2 with the workpiece 3 starts. The following situations may arise to the next odd position: the first is normal when the turn of the disk continues until the next sector B of the disk 7 acts on the sensor 6, the sensor 6 is included in its signal, through the OR element 29 it enters the driver 34 pulses that generate a pulse, and then this pulse goes to the first inputs of the AND 15, 16 elements. At the output of the AND 15 element, a pulse appears, which through the OR 30 element enters the second reset input of the memory element 37 and includes the input of the element 38 memory Here, the memory element 37 is turned off, and the memory element 38 is turned on. The rotation of the working disk 2 with the workpiece 3 is stopped and the fixation begins at the next, third position.

The motor 4 for fixing the mechanism of the head will be turned on until the sensor 9, the recording moment of fixation, is turned on. Signal from sensor 9 through

the OR element 33 is supplied to the second switching input of the memory element 38. Engine 4 is turned off, the work disk with the workpiece is in the locked position. The drives are quill and

0 spindle, processing of the workpiece at the second odd position begins.

Upon completion of processing, the machine quill rises and turns on the sensor 39 for the top position of the quill.

5 The signal from the sensor 39 is fed to the input of the device 11. Therefore, a signal with a pulse duration of 0.1 s appears at the output of the pulse shaper 51 and the output of the device 11, which acts on

0 includes the input of memory element 37.

Next, the engine 4 is turned on and the release and turning of the working disk 2 with the workpiece 3 to the next odd position and starting in this position begins. So

5 further, for example, up to the 9th last position. The second is an abnormal situation when, at the next turn, the disk with the workpiece did not stop at the next odd position. At the same time, after the next memory element 37 is turned on, the second inputs of the And 17 and 18 elements come with a logic level of 1. At the same time, the first input of the And 18 element also receives a signal from the device 11 with a logic level of 1. At the input of the temporary element 36 a signal also appears with a logic level of 1. If the activation time of memory element 37 exceeds the transit time from one position to another, time element 36 triggers, the output signal of which passes through the OR elements 31, 32 and acts on the switching off inputs 37 s 38 memory. In this case, the rotation of the work disk with the workpiece is stopped. The output signal from the OR element 31 can be used to turn on the sound or light alarm that detects a malfunction of the device, and the signal is input to the device

0 11 and LED 62.

When processing blanks of the second type, two situations may also arise, similar to the above. In this case, instead of sensor 6, sensor 5 is activated, which

5 reacts with sector A of disk 7.

When processing the workpieces of the third type involved sensors 5 and 6.

In this case, it is possible to process workpieces at both even and odd fixed positions;

skip positions where processing is not provided.

Suppose that, for example, it is necessary to process the workpiece at the 1, 2, 3, and 10th fixed position. At the same time, from the device 11c output 1, 2, 4, 6, 7-15, information is received with a logic level 1, with 1 and 2 outputs - permission to work sensors 5 and 6, from outputs 6, 7-15 - permission to work elements And 19, 20-28. At the same time, the switch 47 is set to the 3rd position, and the toggle switches 52, 53, 54 and 61 to the on state. After setting the switch 47 to the on state from the output of the pulse driver 50 and the output of the device 11, a pulse arrives at the input of the counter 14, which sets the counter to the state at which its outputs have a potential with a logic level of O.

Further, through a delay of 0.2 seconds, from the output of the delay element 49 and block 11, permission is given to the operation of the elements 16, 17. A delay of 0.2 seconds is necessary so that the pulse generated by the pulse shaper from the switched on sensor 6, did not pass through the element AND 16 to the input of the counter 14.

This state is original. Next, the spindle is turned on and the machine tool for processing the workpiece is lowered at the first position. After finishing the treatment at the first position, the machine quill rises and turns on the sensor 39, which fixes the top position of the quill.

At the same time, a signal arrives at the first input of the device 11, and at the 16 output of the device 11 a pulse with a duration of 0.1 s appears, which, arriving at the switching input of the memory element 37, switches it to the state where the amplifying device 12 is turned on and engine 4. Starts the release and rotation of the working disk 2 with the workpiece 3.

Two situations can occur during rotation: the first is normal when the sensor 6 is turned off when the disk 7 is rotated, and the sensor 5 is turned on, as it begins to interact with the next sector A of disk 7. The signal from sensor 5 enters the input of the pulse shaping 34 and then through the element And 16 to the input of the counter 14. At the first output of the counter 14, a potential appears with a logic level 1, which through the elements AND 19, OR 30 enters the second reset input of the memory element 37 and sets the input of the memory element 38. The rotation of the work disk with the workpiece is stopped and the engine 4 is turned on for fixation in the second position. The sensor 9 outputs a signal to the second input of the device 11. Next, the workpiece is processed at the second position. Upon completion of the processing of the workpiece at the second position, the spindle is turned off and the quill is raised to the upper position.

Then, the working disk is released and rotated with the workpiece. When the working disk rotates from position to position, the sensors 5, 6 receive electrical signals at the input of the pulse element 34, which are converted by the pulse shaper 34 into pulses, which, through the elements

5 and 16 are fed to the input of the counter 14. At the outputs of the counter 14, signals appear corresponding to the positions passed.

So, when turning to 4, 5, .. 10th positions at the outputs of counter 14, the potential with a logic level of 1 to 4, 5 ... 10 outputs is consistently 0. But since at the second outputs of the elements 21-27 there will be a potential with a logical level of O, then the information will not come through these elements.

5 When reaching the 10th position at the 10th output of the counter 14, the Wits signal that passes through the E28 element, since at its second input there will be a potential with a logic level of 1. Next, the rotation is turned off

0 and fixes on the 11th position. After processing the workpiece at the 11th position, the cycle ends.

The second situation is abnormal when turning, for example, from 3 position to 11

5 there was no stopping and fixing at the 11th position. Since at the beginning of the rotation from the output of the memory element 37, the potential with the logic level 1 enters the input of the element And 17, then at its output and input of the element 35

Delay 0 is also present indicated potential.

If the activation time of the memory element exceeds the rotation time of the work disk by 360 °, then at the output of the delay element 35

5, a signal appears which, through the elements OR 31, 32, acts on the fault inputs of the elements 37, 38 of the memory. The rotation of the disk with the workpiece is stopped and thus the uncontrolled rotation of the working disk is excluded.

Thus, the proposed device for controlling a multi-position object permits processing of the part at any predetermined processing positions, has increased reliability and is much simpler than the known device.

Claims (1)

An apparatus for controlling a multi-position object, comprising a program setting block, an AC reversible electric drive mounted in a head, a group of sensors for determining processing positions, a power source, two memory elements whose outputs are connected to a drive, a pulse counter, characterized in that in order to increase reliability and simplify the design, four AND elements and a group of AND elements by the number of processing positions, five OR elements, two pulse drivers from sweat a potential signal, two delay elements, a current relay included in one of the drive phases, a head locking torque sensor, a top position quill sensor, the output of which is connected to the signal output of the program setting block, the installation output of which is connected to the installation input of the initial state of the counter, group output enablements from the program setting block are connected to the first inputs of a group of elements AND, other outputs are connected respectively to the first inputs of the first and fourth elements AND, to the first inputs of the second and third about elements AND, to the enabling input of the first memory element, to enabling inputs of the first and second sensors, the outputs of which are connected to the corresponding inputs of the first OR element, whose output is connected to the input of the first pulse shaper from a potential signal, the output of which is connected to the second inputs of the first and the second element AND, the output of the first element AND is connected to the first input of the second element OR, and the output of the second element AND is connected to the counting input of the pulse counter, the information outputs of which are connected to the second inputs of elements AND of the group, the outputs of which are connected to a group of inputs of the second element OR, the output of which is connected to the first installation input of the first memory element and the switching input of the second memory element, the second inputs of the third and fourth elements AND are connected to the output of the first memory element and their outputs are connected respectively to the inputs of the first and second delay elements, the outputs of which are connected to the corresponding inputs of the third OR element, the output of which is connected to the input of the second memory element, s in the indication of the program setting block and with the first input of the fourth OR element, the second input of which is connected to the output of the second pulse generator from a potential signal, the inputs of which are connected to the power source, and the output of the fourth OR element to the third inputs , the outputs of the first and second memory elements are connected to the drive inputs, the current relay and the sensor for fixing torque sensor 0 are connected to the inputs of the fifth OR element, the output of which is connected to the fourth input of the second memory element. tpve.1 figure 2. Editor M. Bandura Compiled by A.Zyuzin Tehred M. Morgental // f- 51. fie. four Proofreader E. Lonchakova