RU1808614C - Device for automatic sampling of minimal turning angle of machine rotate-able unit - Google Patents

Abstract

Usage: machine tool, automatic tool changer. SUMMARY OF THE INVENTION: the device, in addition to the already existing blocks, has a code converter, a delay circuit, a memory block and an AND element. The input of the code converter is connected to the output of the program task unit, and the output of the code converter is connected to the second input of the adder. The fourth output of the adder via a delay circuit is connected to the input of the memory unit, the output of which is connected to the fourth input of the control circuit of the rotation drive and the first input of the element I. The second input of the element And is connected to the stop control sensor, and the output to the fifth input of the control circuit. 3 ill.

Description

ate

with

The invention relates to the control of industrial mechanisms and can be used, in particular, to automatically determine the direction of rotation of tool magazines of CNC machines along the shortest path.

The aim of the invention is to increase reliability by reducing dynamic loads by providing a signal of slow rotation of the magazine when approaching the stop position for tool change, as well as by simplifying the structure of the device.

In FIG. 1 is a structural diagram of a device; in FIG. 2 is a diagram of the operation of the device; in FIG. 3 - magazine application and the principle of determining the shortest direction of rotation.

A device for automatically selecting the smallest angle of rotation of a rotating machine assembly comprises a dial 1 that generates a binary decimal (VDS) code for specifying the tool to be searched and a read signal To. In accordance with international standards, coding is done at address T; command apparatus .2 KA, also made in the VVD code and designed to identify magazine sockets; a task code converter 3, which generates a code (Tn ± 1) depending on the direction of rotation, which makes it possible to synthesize a code match signal one step before stopping; an adder 4 forming the absolute difference of the reference and identification signals D IT-KA I, as well as the signals T KA, T KA and T KA (SOVP); memory 5 of the number of tool sockets in the magazine; block 5 comparison to a larger and smaller value,

with

ABOUT

Ltd

forming output signals

 -IT-; logic element 7 AND-OR-NOT;

S-trigger 8; delay circuit 9 t; memory 10 of the signal matching codes of the job code and the identification of the SOVP; logical 11th element And; magazine rotation drive control circuit 12; instrumental 13 store; sensor 14 control stop.

The listed elements of the device in a static position are interconnected in the following manner.

The first output of task unit 1 generates a fast rotation driving signal (BW) for the tool drive control circuit 13 of the tool magazine 13, the VSD code of the setter 1 is fed to the first input of the adder circuit 4, as well as to the code conversion circuit 3 controlled by the trigger signals 8 , the output of the code converter 3 is connected to the second input of the adder circuit A, the third input of which receives the VVD code of the command device 2 identifying the actual position

, / N store. Instrument Number Code

of store sockets from memory 5 is fed to the first input of the comparison unit 6, to the second input of which the module of the difference of the task and identification codes A 1T-KAI from the adder circuit 4 is received, the result signals

Comparisons A-TTL A-p- arrive at

the first inputs A of the AND-OR-NOT element 7, to the second inputs of which, respectively, the output signals and adder circuits 4 are supplied, and the external inputs are rotated by the third inputs. The output of element 7 is AND-OR-NOT. generating a working rotation signal counterclockwise comes from the installation input of the RS-flip-flop 8, the outputs of which, generating signals AGAINST and ON, are fed to the second and third inputs of the rotation drive control circuit 12, respectively; the fourth output of adder circuit 4, which generates a signal for matching the reference codes and identification of the SOVP (Tn ± 1) on the spacecraft through delay circuit 9 At is connected to the coincidence signal memory unit 10, the output of which generates a delay signal in the RAM and arrives at the fourth input of the circuit 12 of the rotation drive control, as well as to the first input of the logical element 11 And, the second input of which is fed by the signal of the sensor 14 of the stop control, and the output of the logical 11 of the element And generates a stop signal OST and is fed to the fifth input of the control circuit 12.

nor a rotation drive of the tool magazine 13.

The device operates as follows.

When the power is turned on, the NU initial setting signal resets the trigger for the memory 10 of the match signal, generating. Trigger 8 is set to state 10, AGAINST 1. Since the ON and AGAIN signals are purely informational, and the signal T0 (BV) 0, they do not lead to the rotation of the magazine 13. By the command of the control program or in the setup

In mode 15, the master 1 generates a VSD code for the task to be searched for T1, T2, T4, T8, T10, T20, T40 and T80, and also through the time delay, the read signal To. In this case, the setter-1, the command device 2,

20 adder 4, memory 5, comparison unit 6, AND-OR-NOT 7 element, subject to the presence of the enable signal ROTARY 1, generates a rotation signal along the shortest path in accordance with the algorithm (see Fig. 3);

25 - Clockwise rotation,

N 2

if TJA and T-KA

 KA0

5

0

5

0

5

,those.

; -),) - (),

ON (T KA) - (And where D | T-KA |.

- Counterclockwise rotation AGAINST, AGAINST

ON - (T KA) N,

(

+ () - (A 4), which makes it possible to use the standard AND-OR-NOT chip. Thus, if the AND-OR-NOT logic 7 generates a signal, then the state of trigger 8 does not change and AGAINST 1, counterclockwise rotation. If the AND-OR-NOT element generates a signal, then trigger 8 changes its state, AGAINST 0, clockwise rotation. According to the To (BV) signal, the rotation drive control circuit 12 in the presence of enabling locks will unlock (the RASF signal) the magazine and, if there is a release control signal, the Krasf turns on fast rotation (see Fig. 2), the type of rotation drive is electric or hydraulic, does not matter. The rotation signal ROTARY - 0 blocks the output of the AND-OR-NOT element 7, excluding the possible change in the state of the trigger 8. At each step of the magazine 13, when it is rotated by the adder-compare circuit 4,

comparing the code of the spacecraft command device and the output code of the code converter 3, which generates the VSD code, the weight of which, depending on the direction of rotation, is one more or less than the code of the setter 1, This is necessary to generate a code match signal one step before the store stops, i.e. e.

COBn - {(KA | STi-t) -nO +

+ (KA | 5Pn-1) -PRONTIV1-ROTATION.

Here, the ROTARY signal is an auxiliary blocking signal generated by the rotation drive control circuit 12. When the codes coincide, the SOVP-1 signal and after the time delay Ar turns on the memory 10 of the coincidence signal, generating a deceleration signal RAM 1 for the rotation drive control circuit 12. The time delay Ar is necessary to exclude the action of the signal of the stop monitoring sensor 14 at the time of comparison. The store slows down and in the next step, the And circuit 11 generates a stop signal OST-ZAM-Bone. The store stops and locks (Kfix). In this case, the rotation signal is removed, the triggers 8 for generating the rotation direction signals and 9 codes for the code matching signal are reset. The device is ready for a new cycle of work.

All units of the device are made on standard known elements, the construction principles of which are articulated in special technical literature and textbooks; therefore, there is no need to present their schematic diagrams. 1) Task block 1 is a dial-up field of switching elements, for example, an industrial biscuit switch in the IRR code or a numerical control device,.

2) The command device 2 is a set of contact or proximity switches.

3) Code converter 3, adder 4, comparison unit 6 are made according to the classical principles described.

4) Memory 5 of the number of sockets in the store is a set of typical RS-flip-flops or other switching devices, for example, jumpers to logic zero and one.

5) Logic element 7 AND-OR-NOT - a typical microcircuit.

6) Memory 8 and 10 - typical RS-flip-flops,

7) Temporary element 9 is a typical rising edge delay circuit based on a capacitor charge.

5

0

5 0 5 0

5

0

5

0

5

8) Logical 11 element And - a typical microcircuit ..

9) The control circuit of the rotation drive is not an object of the invention; its construction depends on the particular design of the tool magazine and the type of drive, electric or hydraulic. Docking schemes of industrial electric drives are also described in detail.

10) Sensor 14 stop control - microswitch or any non-contact industrial sensor.

The economic effect of the implementation of the claimed invention in comparison with the prototype is achieved by reducing the rigidity requirements of the tool magazine design, increasing its working time and increasing reliability, which explains the introduction of a slow feed when approaching the stop position, providing an exact stop and reducing dynamic loads. The final result is an increase in reliability and productivity. The estimated need of the national economy for such devices is thousands of pieces per year.

Formulas

A device for automatically selecting the smallest angle of rotation of a rotating assembly of a machine tool, mainly a tool store of CNC machine tools, comprising an electrically connected memory unit, program setting units and identification of the actual position of the store, serially connected adder, comparison unit, AND-OR-NOT element and circuit drive control, rotation, and so on, in order to increase reliability by reducing dynamic loads by providing the formation of a signal of slow rotation of the magician zina when approaching the stop positions for changing the tool, it is equipped with a code converter, a delay circuit, a memory unit and an AND element, with the input of the code converter connected to the output of the program task unit, and the output of the code converter to the second input of the adder, and the fourth output of the adder by means of a delay circuit connected to the input of the memory unit, the output of which is connected to the fourth input of the control circuit of the drive of rotation and the first input of the element And, the input of which is connected to an additional input sensor the trol is stopped, and the output is with the fifth input of said control circuit.

thirteen &

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