SU1206753A1 - Device for controlling excitation coils of electromagnetic clutches of multispindle power nut-setter - Google Patents

Description

The invention relates to mechanical engineering, namely to nut wrenches, and can be used in assembling group threaded connections.

The purpose of the invention is to expand the functionality of the device by determining the magnitude of the actual tightening torque of the threaded connection with each spindle.

FIG. 1 is given a functional diagram of the device; in fig. 2 - time diagram of the device.

The multi-spindle nut driver consists of a motor 1, a torque sensor 2 located on the motor shaft 1, spindles with working heads 3 driven shafts 4 with clutch electromagnetic clutches 5 and gears 6, the central gear 7, which meshes with the latter and is installed on the output shaft engine 1 and control unit 8.

Each spindle 3 and the driven shaft 4 are interconnected. Planetary gear 9, control unit 8 contains a comparator 10, a program switch 11, the first pulse counter 12, the second element And 13, the waiting multivibrator 14, the second pulse counter 15, the decoder 16, the third element And 17, element 18, transistor switches 19, excitation coils 20, power supply 21, digital-analog converter 22, pulse generator 23, first element 24, fourth elements 25 and pulse shaper 26, indication blocks 27.

The device works as follows.

The working heads 3 of the multi-spindle nut wrench are mounted on nuts (not indicated) and turn on the engine 1 and the control unit 8, previously set to the initial state (not specified). After turning on the engine 1, the rotation from the central gear 7 is transmitted to the driven gear 6 and due to the residual torque (4-5% of the nominal torque transmitted by the clutch) in the electromagnetic clutch 5, the rotation is transmitted through gears 9 to the working heads 3. screwing the nuts on all spindles. After contact of the ends of the nuts with the bearing surface of the assembly

206753.

all spindles except the first stop, since the second pulse counter 15 is in the zero state and at the first output of the second

5 decoder 16 is the voltage of a logical unit.

At the output of the waiting multivibrator 14, the voltage is absent, therefore at the output of the element HE 18 also

10 there is a logical one voltage, therefore, for the element And 17 of the first group the coincidence condition is fulfilled, the corresponding transistor switch 19 is open, the coil 20

15, the exciter is connected to the power supply unit 21, the clutch 5 is turned on and transmits rotation to the working head 3. For the remaining AND elements 17, the coincidence condition is not fulfilled,

20 therefore, the remaining transistor switches 19 are closed, the excitation coils 20 of the remaining clutches 5 are disconnected from the power supply unit 21, the clutches 5 do not transmit the moment, but operate in the mode i = i

25 calves Since the first counter 12 is in the zero state, there is no voltage at the output of the digital-to-analog converter 22, there is no voltage at the output

30 of the torque sensor 2, therefore, the output of the comparator 10 is a logic zero voltage, the matching condition for AND 24 is not fulfilled and the output of the generator 23 is disconnected from

, g information input of the first counter 12 pulses.

I

When the nut is tightened, a voltage proportional to the torque on the working spindle appears at the output of the torque sensor 2, the comparator 10 is activated, the voltage of the logical unit appears at its output, the matching condition for the AND 24 element begins to be fulfilled, and the generator 23 is connected to the information input of the first counter 12 pulses. The counter 12 begins to fill with pulses, therefore, the voltage at the output of the digital to analog converter 22 begins to increase. As soon as the voltage at the output of the digital to analog converter exceeds the value of one step of the reference voltage, the voltage is removed from

55 of the torque sensor 2, the comparator returns to the zero state and disconnects the generator 23 from the information input of the pulse counter 12. Ta40

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In the CMM manner, at each point in time, the counter 12 records the number of pulses corresponding to the torque value on the working spindle of the wrench.

The outputs of the first counter 12 pulses are connected to the inputs of the software switch 11. If the counter coincides, the counter code is 12 s. The code for the required tightening torque dialed in the software switch 11 begins to match the condition for element 13. At the output of element 13, a voltage of the logical unit appears and is fed to the input of the waiting multivibrator 14 and starts it. At the output of the standby multivibrator 14, a pulse appears, the duration of which is set within 0.2-0.8 s. At the output of the element 18 during the action of the pulse of the multivibrator 14, the voltage of the logic zero, the condition for the element And 17 ceases to be fulfilled, the transistor switch 19 is closed, and the clutch 5 is disconnected.

Due to the inertia of the drive, the torque for some time after the excitation of the coil 20 of the clutch coupling 5 continues to increase, therefore, the comparator 10 is in the unit state, and the generator 23 is connected to the information input of the first pulse counter 12 of pulses.

When the moment on the working head 3 of the wrench begins to decrease, the comparator 10 will disconnect the generator 23 from the input of the counter 12 and the number of pulses corresponding to the maximum value of 06753 is fixed in the counter 12.

torque, corresponding to the tightening torque of the threaded connection.

Since, when tightening the first spins5 divide, the condition for the element And 25 is satisfied, the number of pulses of the generator 23, corresponding to the value of the actual tightening torque of the first threaded

10 connection, goes to the indicator 27. After the end of the action of the pulse of the waiting multivibrator, the counter 15 switches to the next state and the activation

15 regular electromagnetic clutch 5 clutch. The falling edge of the multivibrator pulse resets the first pulse counter 12, which prepares for measuring the torque when the second spindle is tightened. Zatka second nut is similar to the first. After the end of the tightening, all nuts turn off the engine and wrench.

25 removed from the clamped nuts. In this case, indicator 27 records the number of pulses corresponding to the tightening torques of threaded connections.

2Q Introduction to the multi-spindle wrench listed in the formula distinctive features allows you to expand the technological capabilities of the wrench by obtaining information about the value of the actual moment

 tightening the threaded connection with each spindle.

The proposed device allows determining the values of the actual tightening torque of each spindle of the multi-spindle nut wrench, which expands the technological capabilities of the multi-spindle nut wrench.

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Compiled by N. Gorbunova Editor L. Zaitseva Tehred A. Babinets Proofreader S. Shekmar

Order 8711/49

Circulation 837

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

FIG.

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Claims (1)

A DEVICE FOR MANAGING THE EXTERNAL EXTERNAL CODES OF A MULTIPLE SPINNING WIPER, containing a torque sensor connected by an output to the first input of a comparator connected by an output to the first input of the first element I connected by an output to the counters input of the first pulse counter connected by the drawers. the inputs of the second element And connected by the output to the input of the multivibrator connected by the output to the input of the element NOT and to the counting input of the second about the pulse counter connected by the bit outputs to the inputs of the decoder connected by the outputs to the first inputs of the third elements. And connected by the second inputs to the output of the element NOT, and the outputs to the control inputs of the corresponding keys connected by the first output to one output of the power supply and the second output through the excitation coil of the corresponding electromagnetic clutch to another output of the power supply, characterized in that, in order to increase the functionality of the device, a pulse generator is introduced into it, the number of spindles are fourth AND elements, a digital-to-analog converter and a pulse shaper connected by an input to the output of the element NOT, and an output to a reset input of the first pulse counter connected by bit outputs to the inputs of a digital-analog converter connected by an output to the second input of the comparator, with the first inputs of the fourth And elements connected to the corresponding outputs of the decoder, and the second inputs - with the output of the first element And connected by the second input to the output of the pulse generator. _120675.3, >