SU1366381A1 - Device for tightening threaded joint - Google Patents

Abstract

The invention relates to devices for tightening threaded connections. The purpose of the invention is to expand the technological capabilities for C4et continuous monitoring of the torque of the threading of the threaded connections. The device for tightening the threaded joint includes a pneumatic wrench 1 with an electropneumatic valve 2 and a trigger switch 3, a torque sensor 4 and a rotation angle sensor 5. Pneumatic wrench 1 start to work. The torque and rotation sensors 4, 5 produce signals that are fed to the inputs of the control system 6, which continuously calculates the derivative value dM / dcf. The calculated values of the derivative are fed to the input of the maximum extraction unit 9, where its maximal value is allocated, it goes to one of the inputs of the multiplication unit 10, to the other input of which a voltage proportional to the required axial pulling force is applied to the other input of the voltage divider 7 a threaded joint, which corresponds to the angle of rotation by which the threaded joint must be rotated in order to obtain the required axial tightening force. 1 il. (L

Description

00 05

O5 so eo

9, L.

one

The invention relates to mechanical engineering, namely, devices for tightening threaded joints, and can be used to mechanize the assembly of threaded joints in various industrial zones.

The aim of the invention is the expansion of technological capabilities through continuous monitoring of the torque for tightening threaded connections without reconfiguring it.

The drawing shows a block diagram of the device.

The device for tightening the threaded joint includes a pneumatic wrench 1 with an electropneumatic valve 2 and a trigger switch 3, a torque sensor 4 M and an angle sensor 5 turning q. The control system 6 includes a voltage divider 7, a torque calculation unit 8 dM / dqi of the torque over the angle of rotation, one of the inputs of which is connected to the torque sensor 4, the other to the angle of rotation angle sensor, block 9 of the maximum torque derivative with respect to the angle of rotation, the input of which is connected to the output of block 8 for calculating the torque derivative with respect to the angle of rotation, output to the input of multiplication unit 10, one of the inputs of which is connected to voltage divider 7, and comparator 11, one of the inputs which is connected to the sensor com 4 torque, the other with the output of block 10 multiply, and the output with electropneumatic valve 2.

The device for tightening the threaded joint works as follows,

The pneumatic wrench 1 is put into operation using the trigger switch 3. The sensors 4 and 5 of the twisting, twisting moment and angle of rotation, respectively, begin to overload the signals that are fed to the inputs of the control system 6, which continuously calculates the derivative value dM / d Cf .

The calculated values of the derivative dM / d (arrive at the input of the maximum extraction unit 9, where its maximum value is allocated, which is

ten

1G

20

25

thirty

35

40

45

50

12

It goes to one of the inputs of the multiplication unit 10, to the other of the inputs of which voltage separator 7 is given a signal proportional to the ratio of the magnitude of the required axial pulling force to the rigidly threaded connection, which corresponds to the angle of rotation for which the threaded connection must be turned obtaining the required axial tightening force. At the input of the multiplication unit 10, a signal is generated that is proportional to the torque value with which the threaded connection must be pulled in order to achieve the required axial tightening force.

Claims (1)

This signal is compared by the comparator 11 with the torque sensor output signal 4 and when the torque reaches the calculated value, the comparator 11 triggers and turns off the wrench 1, which is achieved by applying a control signal to the input of the electropneumatic valve 2 that blocks the compressed air supply to the wrench The invention The device for tightening the threaded joint, containing a pneumatic wrench with an electropneumatic valve and a three-switch switch, torque and rotation angle sensors, with control unit, including a voltage divider, a block. calculating the torque derivative with respect to the angle of rotation, one of the inputs of which is connected to a torque sensor, the other with an angle of rotation sensor, a multiplication unit, one of the inputs connected to the divider voltage, and a comparator, one of the inputs of which is connected to a torque sensor, the other - to the output of the multiplication unit, and the output - to an electropneumatic valve, characterized in that, in order to expand technological capabilities, it is equipped with a maximum allocation unit n The derived torque is in the angle of rotation, the input of which is connected to the output of the unit for calculating the torque derivative in angle of rotation, and the output is connected to the input of the multiplication unit.