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Pneumatic torque pulse wrench with step-by-step shutoff

A technology of pulse wrench and pneumatic torque, which is used to measure torque/torsion force, motor tools and other directions during wrench and tightening, and can solve problems such as overshoot and too strong pulse torque

Active Publication Date: 2015-11-25
ATLAS COPCO INDAL TECHN AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This means that there is a risk that the last pair of pulses will be too strong and cause an undesired torque overshoot, especially in stiff joints that feature a sharp torque increase per rotational angle

Method used

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  • Pneumatic torque pulse wrench with step-by-step shutoff
  • Pneumatic torque pulse wrench with step-by-step shutoff
  • Pneumatic torque pulse wrench with step-by-step shutoff

Examples

Experimental program
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Effect test

Embodiment Construction

[0020] The power wrench shown in the figures is a pistol-type air pulse wrench comprising a housing 10 with a handle 11 . The handle 11 is provided with a connection 12 for a compressed air line and comprises a throttle valve operated by a trigger 13 . The throttle valve is arranged to control the supply of compressed air through a compressed air supply channel 14 in the housing 10 , which communicates with the air motor 15 . The motor 15 comprises a rotor 17 connected to a square-ended output shaft 18 via a hydraulic pulse unit 20 . The output shaft 18 is intended to carry a nut socket for connection to a threaded joint so that it is fastened. The pulse unit 20 includes an inertial drive member 21 having a rear extension 19 coupled to the motor rotor 17 . In a well-known manner, the inertial drive member 21 also includes an internal fluid chamber into which the rear end of the output shaft 18 extends, wherein the inertial drive member 21 is intermittently coupled to the out...

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PUM

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Abstract

A pneumatic torque impulse wrench comprises a housing (10), a motor (15), a hydraulic impulse unit (20) including an inertia drive member (21) and intermittently coupling the motor (15) to an output shaft (18), a shut-off valve (23) controlling the pressure air supply to the motor (15), and an activating mechanism (25) arranged to shift the shut-off valve (23) from a fully open position to a closed position via one or more partly closed positions. An activating mechanism (25) for shifting the shut-off valve (23) comprises a retardation responsive inertia element (28) movably supported on the inertia drive member (21), and a trip element (24) displaceable by the inertia element (28) and arranged to initially support the shut-off valve (23) in a fully open position during a screw joint tightening process and in succeeding one or more partly open positions for obtaining a power reduction of the motor (15) when approaching a target torque level.

Description

technical field [0001] The present invention relates to a pneumatic torque pulse wrench, which includes a housing, a pneumatic rotary motor, an output shaft, a pulse unit and a power shut-off mechanism, the pulse unit including a motor connected to the motor and intermittently coupling the motor to the output shaft an inertial drive member, the powered shutoff mechanism including an actuation mechanism responsive to a magnitude of retardation of the inertial drive member and a shutoff valve operated by the actuation mechanism for Shut off the compressed air supply to the motor at preset target torque levels. [0002] In particular, the present invention relates to a pneumatic torque pulse wrench of the type described above, wherein the power shut-off mechanism includes trip means actuated by an inertial member that retards the response so that when the magnitude of the transmitted torque pulse Reaching a certain level corresponding to a preset target torque level releases the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25B21/02B25B23/145G01L5/24
CPCB25B23/145B25B21/02B25B23/1453
Inventor P·T·瑟德隆德
Owner ATLAS COPCO INDAL TECHN AB
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