SU1267366A1 - Device for controlling excitation coils of electromagnetic clutches of multispindle power nut-setter - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in multi-spindle wrenches for assembling group threaded connections. The purpose of the invention is to expand the functional capabilities of the device by including in the predetermined sequence of electromagnetic couplings only those spindles, the moment at which has not reached the set value. The device contains a comparator, a torque sensor, a power supply unit, a group of first (by the number of spindles) elements AND, a group of first RS triggers, a group of fourth elements AND, two OR elements, two pulse drivers, two pulse generators, a single vibrator, a second RS trigger, the group of the second elements is AND, the third element is AND, the pulse counter, the decoder, the group of keys, two elements are NOT. Introducing a single vibrator, two S pulse drivers, two ORES, a third AND element, a group of fourth AND elements, a second RS flip-flop, two NO elements, and a second pulse generator with appropriate functional connections allows you to achieve the goal. 2 Il.

Description

one

The invention relates to mechanical engineering and can be used in multi-spindle wrenches for assembling group threaded connections.

The purpose of the invention is to expand the functionality of the device by including in the predetermined sequence an electromagnet:, 1x couplings, only those spindles, the moment of which has not reached the set value.

Figure 1 is given a functional diagram of the device; FIG. 2 is a time diagram of the operation of the device (for a duplex wrench).

The device includes an engine 1, a torque sensor 2 mounted on the engine shaft 1, spindles 3 with working heads 4, driven shafts 5, clutch couplings 6, driven gears 7 and planetary gears 8, central gear 9 mounted on the shaft of engine i and kinematically Slave with the slave. gear 7 spindles 3, and control block 10, containing a power supply block 11, comparator 12, first elements AND 13, first K5 triggers 14, quaternary elements AND 15, second element OR 16, second shaper 17 pulses, second generator 18 pulses, one-shot 19, first pulse shaper 20, second RS trigger 21, first pulse generator 22, third AND 23 element, pulse counter 24, decoder 25, second AND 26 elements, grzpp keys 27, clutch electromagnetic coils 28, first element OR 29, the second element is NOT 30 and the first element t is 31.

The device works in the following way.

The working heads 4 of the wrench are mounted on nuts (not shown) and start the engine 1. After turning on the engine I, rotation from the central gear 9 is transmitted by the driven gear 7 of the spindles 3 and due to the residual torque (4-5% of the nominal torque transmitted by the clutch) The electromagnetic clutches 6 of the rotational clutch are transmitted through the planetary gears 8 to the workers

heads 4. When this happens ITS.

Free spindle tacking with all spindle and 3 wrenches. After contact 663662

But the ends of the nuts with the bearing surface of the assembled unit, all the spindles 3, stop as the moments on the spindles become larger than the relative moments of the corresponding electromagnetic couplings and the latter begin to work in the slip mode.

After the spindles 3 are stopped, the control unit 10, previously set to its initial state, is turned on (triggers 15, 21, pulse counter 24). At the same time, the generator 18 begins to generate pulses, the 15th repetition period of which is set within 0.05-1 s. The pulses from the output of the generator 18 are fed to the input of the one-shot 19 and it is periodically started. At the same time, the output of the one-shot 19 appears pulses, the duration of which is set within 0.025-0.5 seconds. From the back of the pulse of the one-shot 19 fornirovatu lem 20 pulse, a pulse is formed which sets the trigger 21 into one state, the coincidence condition for the And 23 element starts to be fulfilled and the counting input of the counter 24 is im-

The 30 pulses are connected to the output of the pulse generator 22, the oscillation frequency of which is set 100-1000 times higher than the frequency of the generator 18.

35 The front edge of the pulse generator pulse 22 pulse 22 is switched to the first state. In this case, the coincidence condition for the elements AND 15 is not fulfilled, since at the end of the course of the NE 31 there is a voltage of logical zero.

Since the triggers 14 are in the zero state and at their inverse outputs the voltage of the logical unit, after the end of the action of the generator 22 pulse for the first element 15, the condition of coincidence is fulfilled, the voltage of the logical unit at its output

50 of the leading edge of which by the shaper 17 (1 pulse is set, setting trigger 2 to zero; the condition. The match condition for AND 23 ceases to be satisfied

Claims (1)

55 and the output of the generator 22 is disconnected from the counting input of the pulse counter 24. As a result, the matching condition for the first element AND 26 begins to be met, the key 27 is opened, and the excitation coil 28 is connected to the power supply unit. In this case, the electromagnetic clutches of the 6 remaining spindles are disconnected and the spindles do not rotate. Under the action of the applied voltage, the clutch engages which transmits rotation to the working head A, as a result of which the nut is partially tightened for a time until the pulse of the one-shot 19. During this time, the moment on the sensor 2 is determined by the moment on the working head 4 spindle. When the next pulse of the generator 18 arrives at the input of the one-oscillator 19, a logical one voltage appears at its output, and a logical zero voltage at the output of the NOT element 30, the matching condition for the And 26 elements stops the (transistor) key 27 through which the first electromagnetic clutch 6 is connected, turned off, and the spindle stops. With the falling edge of the one-shot 19, the trigger 21 is set to one state, the coincidence condition for the element And 23 again starts to be fulfilled and the first pulse of the generator 22 counts 24 to the next state. On the next output of the decoder, a signal appears that is used to connect the electromagnetic coupling 6 of the next spindle, as a result of which a partial nut is tightened. In this case, the torque on sensor 2 is determined by the torque on the running next spindle. Thus, the mechanical switching of the sensor 2 from one spindle to another is carried out and the voltage at its output characterizes the moment at the working head of the working pin. When the working torque reaches the set torque value, the comparator 12 is triggered. A voltage of logical unit appears at its output, which through the AND 13 element for which the coincidence condition is fulfilled goes to the set-up S input of the trigger 14 and sets it to the unit state, the coincidence condition for the corresponding element AND 15 stops running, the voltage of the logical unit disappears at the output of the S1I element 16, the matching condition for the corresponding element And 26 also stops n be the key (transistor) 27 is closed and the sleeve 6 is cut off. When the next pulse of the generator 18 arrives at the input of the one-shot 19 by the back edge of the pulse of the one-shot, the trigger 21 is set to one, the matching condition for the element 23 begins to run, the output of the generator 22 is connected to the counting input of the pulse counter 24 and element 23 and the counter 24 switches to the next state. In this case, the next output of the decoder 25 is the voltage of the logical unit, and if the corresponding trigger 14 is in the unit state, since the set torque by this spindle has been reached, then after the end of the generator pulse 22 the coincidence condition for the corresponding element And 15 does not hold, at the output of the element OR 16 the voltage is a logical zero and trigger 2 continues to remain in the unit state. The coincidence condition for the AND element 23 continues and the second pulse arrives at the counting input of the pulse counter 24, which switches the counter to the next state. If the next trigger 14 is in the single state, the trigger 21 continues to remain in the single state, and the counter 24 of the generator 22 pulses switches to the next state. This mode of operation will continue until the trigger 14, which is in the zero state, is detected. In this case, after the end of the pulse of the generator 22, the matching condition for the corresponding element AND 15 starts to be fulfilled, the output of the element OR 16 is the voltage of the logical unit, the leading edge of which the counter 21 returns to its initial state, which leads to the disconnection of the output of the generator 22, from the countable $ 1 input of the counter 24, the partial tightening of the unattached nut begins. When the set torque value is reached by all the spindles of the multi-spindle wrench, all the triggers 14 are alternately set to one state, which leads to the disconnection of the electromagnetic clutches of all the spindles. The ratchet ends, the drive motor 1 is disconnected, and the wrench is removed from the tightened nuts. Claims An apparatus for controlling excitation coils of an electromagnetic multi-spindle nut driver comprising a comparator connected by a first input to a device mounting bar, a second input to an output of a torque sensor kinematically connected to the shaft of a nut driver, and the output to the first inputs by the number of spindles of the first elements And, connected by the second inputs to the corresponding outputs of the decoder and to the first inputs of the corresponding second elements I, and the outputs to the S inputs of the first RS flip-flops, the first gene pulse generator, pulse counter connected by bit outputs to the decoder inputs, a group of keys connected by control inputs to the outputs of the corresponding second elements I, outputs with a negative output of the power supply, and inputs through the corresponding excitation coil of the electromagnetic wrench couplings with a positive output power supply unit, characterized in that, in order to expand the functional capabilities of the device due to the inclusion in the predetermined sequence of electromagnetic couplings of those spindles, oment on which the set value was not reached, a single vibrator, two pulse drivers, two OR elements, a third AND element and the fourth AND elements by the number of spindles, as well as a second RS trigger, two NOT elements, and a second pulse generator connected by an output to the input one-shot connected to the first input of the first element OR through the first pulse shaper - to the S-input of the second RS-flip-flop connected by the input to the output of the second pulse shaper, and the direct output to the second input of the first And element LI and to the first input of the third element I., connected by the second input with the output of the first pulse generator, and the output to the counting input of the pulse counter and through the first element NOT to the first inputs of the fourth And elements connected by the second inputs to the corresponding outputs of the decoder, the third inputs - to the inverse outputs of the respective first RS-flip-flops, and outputs - to the inputs of the second OR element, connected by an output to the input of the second pulse generator and the second inputs of the second AND elements connected by third ones moves to the second output of the NOR associated input to an output of first OR. 7 v 12 -V fig.g FIG. 2