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Electric pulse tool

A technology of electric pulses and tools, applied in power tools, manufacturing tools, metal processing, etc., can solve problems such as pulse number expansion

Active Publication Date: 2019-12-31
ATLAS COPCO INDAL TECHN AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One problem associated with undefined pulses is the expansion of the number of pulses required to achieve e.g. a target torque

Method used

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  • Electric pulse tool

Examples

Experimental program
Comparison scheme
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Embodiment approach

[0018] According to one embodiment, the sensor 25 is arranged on the output shaft 14 . Alternatively, the sensor 25 may be located on the gear unit 13 . However, the sensor 25 may be located elsewhere in the electrical pulse tool 10 . According to an exemplary embodiment of the present invention, the sensor 25 is a torque sensor 25 . According to another exemplary embodiment of the invention, the sensor 25 is a position sensor 25 .

[0019] In electric pulse tools according to the prior art, pulses are generated by applying a fixed current to a motor in the power tool for a fixed time. The problem with this approach is that the pulses cannot be clearly defined. One problem associated with undefined pulses is the spread of the number of pulses needed to achieve eg a target torque.

[0020] However, the inventors have realized that a well-defined pulse can be obtained by controlling the speed of the rotor 12 until it is determined that the play in the gearing 13 closes and t...

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Abstract

The present disclosure relates to an electric pulse tool (10) and a method in an electric pulse tool (10) to achieve well defined pulses. This object is obtained by an electric pulse tool (10), wheretorque is delivered in pulses on an output shaft (14) of the electric pulse tool (10). The electric pulse tool (10) comprises an electric motor (11) with a rotor (12) and a gear arrangement (13) adapted to drive the output shaft (14). Whereby the electrical pulse tool (10) for each period is operative to control the speed of the rotor (12) until a play in the gear arrangement (13) is determined tobe closed and the gear arrangement starts to move the output shaft

Description

technical field [0001] The invention relates to an electric pulse tool and a method in an electric pulse tool. In particular, the present invention relates to an electric pulse tool for performing screwing operations in which torque is transmitted in pulses to eg tighten and / or loosen threaded joints. Background technique [0002] Power tools for tightening bolts, screws and nuts are used in many different applications. In some such applications, it is desirable or even required to be able to control the clamping force or at least the associated torque. Such power tools are typically controlled to rotate an output shaft of the power tool to measure torque. When the torque reaches a predetermined value, the electric tool is controlled to stop the rotation of the output shaft. For example, this can be achieved by cutting power to the tool, or it can be achieved by slipping a clutch. [0003] A problem encountered when operating power tools, especially hand-held power tools...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B25B21/00B25B21/02
CPCB25B21/00B25B21/02B25B23/147B23P19/066B25B23/1475
Inventor A·克洛特布利克斯特C·J·纳赛尔
Owner ATLAS COPCO INDAL TECHN AB