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Optimized method for setting expansion anchors by means of a power tool

A technology of a machine tool and an expansion sleeve is applied in the field of optimized installation of an expansion anchor by means of a machine tool, and can solve problems such as limiting the application range of the expansion anchor.

Active Publication Date: 2017-02-22
HILTI AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increased loss of preload reduces the load values ​​achievable with the expansion anchor and thereby limits the range of applications of the expansion anchor
[0006] Loss of preload may be caused by very high speeds of the installation process

Method used

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  • Optimized method for setting expansion anchors by means of a power tool
  • Optimized method for setting expansion anchors by means of a power tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0027] figure 1 An exemplary expansion anchor 1 comprising a tie rod 2 and an expansion sleeve 3 is shown. The expansion sleeve 3 surrounds the cylindrical section 4 of the tie rod 2 in the circumferential direction. The outer diameter 5 of the cylindrical section 4 is preferably slightly smaller than the inner diameter 6 of the expansion sleeve 3 , so that the tie rod 2 is axially movable relative to the expansion element 3 . The cylindrical section 4 merges into a conical section 7 which forms the expansion body 8 for expanding the expansion sleeve 3 . The largest diameter of the conical section 7 is larger than the inner diameter 6 of the expansion sleeve 3 and preferably smaller than the outer diameter 9 of the expansion sleeve 3 . A thread 10 is provided on the tie rod 2 , by means of which a traction force can be introduced. In the exemplary expansion anchor 1 , the thread 10 is simultaneously used for load-bearing fastening. During assembly, the expansion anchor 1 i...

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Abstract

Method for setting an expansion anchor by means of a power tool, having the steps of exerting rotary impacts on an expansion anchor in order to expand an expansion sleeve in dependence on a first rotational speed until a tightening torque corresponds to a threshold value; exerting a predetermined number of rotary impacts on the expansion anchor in dependence on the first rotational speed; and exerting rotary impacts on the expansion anchor by way of the power tool in dependence on a generated second rotational speed for a predetermined period of time. Power tool containing an input device, a percussion mechanism for generating rotary impacts, a device for sensing a tightening torque and a control device. The control device is configured to set a first rotational speed, with the result that rotary impacts that are dependent on the first rotational speed are able to be exerted on the expansion anchor until an exerted tightening torque corresponds to a predetermined threshold value, and to set the power tool such that a predetermined number of rotary impacts is exerted on the expansion anchor, and to set a second rotational speed, with the result that rotary impacts are able to be exerted on the expansion anchor for a predetermined period of time.

Description

technical field [0001] The invention relates to a method for installing an expansion anchor by means of a machine tool, in particular a percussion screw machine. Furthermore, the invention relates to a machine tool, in particular a percussion screw machine, for carrying out the method, which machine tool comprises an input device for detecting the type of expansion anchor or the tightening torque for the expansion anchor, with An impact mechanism for generating rotational shocks that can be transmitted by and to the expansion anchor, a device for detecting the rotational angle of an output shaft of a power tool, and a control device. Background technique [0002] The expansion anchor is inserted into the pre-drilled hole and is then tightened in the hole by means of a torque wrench as standard. The use of a torque wrench proves to be necessary, since the user cannot observe in the expansion anchor inserted in the hole whether the expansion anchor is properly stretched, ie i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B25B21/02B25B23/147B25B31/00
CPCB25B21/02B25B23/1475B25B31/00
Inventor H-D·高尔
Owner HILTI AG
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