Power tool with measurement of a penetration depth of a working tool
AssigneeHilti Aktiengesellschaft
InventorChristoph Wuersch
Life of this patent
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Abstract
A power tool (1) for driving a working tool (3) that penetrates at least axially into a to-be-machined material (2), and including a signal processor (6, 6′), and a transducer (5) which is suitable for exciting and detecting a high-frequency electromagnetic wave (4) propagating axially along the working tool (3) and which is connected to the signal processor (6, 6′) that is designed to determine the penetration depth (T) of the working tool (3) into the material (2) based on high-frequency electromagnetic waves (4).
Claims16
A power tool for driving a working tool (3) that penetrates at least axially into a to-be-machined material (2), comprising a signal processor (6, 6′) designed to determine a penetration depth (T) of the working tool (3) into the material (2) based on high frequency electromagnetic waves (4);
- and a transducer (5) suitable for exciting and detecting a high-frequency electromagnetic wave (4) propagating axially along the working tool (3), which is a waveguide of the electromagnetic wave, and connected to the signal processor (6, 6′);
- wherein the transducer (5) is formed as a coaxial conductor system whose elongate inner conductor is formed at least partially by the high-frequency conducting power tool (3) and whose sleeve-shaped outer conductor is formed at least partially by a high-frequency conducting housing (7) of the power tool, the inner conductor and outer conductor being insulated from one another with respect to high frequency.
A power tool for driving a working tool (3) that penetrates at least axially into a to-be-machined material (2), comprising a signal processor (6, 6′) designed to determine a penetration depth (T) of the working tool (3) into the material (2) based on high frequency electromagnetic waves (4);
- and a transducer (5) suitable for exciting and detecting a high-frequency electromagnetic wave (4) propagating axially along the working tool (3), which is a waveguide of the electromagnetic wave, and connected to the signal processor (6, 6′);
- wherein the signal processor (6) has a clock generator (12), a high-frequency pulse generator (13) which is suitable for outputting voltage pulses with rise times of less than 120 ps, a fast measurement input (14) which is suitable for detecting voltage signals with sampling times of less than 12 ps, and computing means (15) which contain a controlling algorithm (16) having a runtime module (17) for determining a time difference (Δt) between at least two voltage pulses selected by the measurement input (14).
A power tool for driving a working tool (3) that penetrates at least axially into a to-be-machined material (2), comprising a signal processor (6, 6′) designed to determine a penetration depth (T) of the working tool (3) into the material (2) based on high frequency electromagnetic waves (4);
- and a transducer (5) suitable for exciting and detecting a high-frequency electromagnetic wave (4) propagating axially along the working tool (3), which is a waveguide of the electromagnetic wave, and connected to the signal processor (6, 6′);
- wherein the signal processor (6′) has a variable-frequency high-frequency oscillator (19) which is suitable for stationary oscillations with frequencies greater than 8 GHz, a demodulator (20) for amplitude modulation of the high-frequency signal, a measurement input (14) suitable for detecting the amplitude signal of the high-frequency signal, and computing means (15) containing a controlling algorithm (16) which has a standing wave module (21) for determining the high-frequency-specific standing wave ratio and a distance module (22) for determining a distance (d) based on at least two different high-frequency-specific standing wave ratios.
A measurement method of determining the penetration depth (T) of a working tool (3) penetrating at least axially into a to-be-machined material, comprising the steps of providing a power tool for driving a working tool (3) that penetrates at least axially into a to-be-machined material (2), comprising a signal processor (6, 6′) designed to determine a penetration depth (T) of the working tool (3) into the material (2) based on high frequency electromagnetic waves (4);
- and a transducer (5) suitable for exciting and detecting a high-frequency electromagnetic wave (4) propagating axially along the working tool (3), which is a waveguide of the electromagnetic wave, and connected to a signal processor (6, 6′), carrying out a distance measurement up to a free end of the working tool in a first step, with the working tool (3) being exposed, and carrying out a distance measurement up to a surface of the machined material (2) in a second step with the working tool (3) penetrating into the machined material (2);
- wherein a time difference (Δt) between a first positive signal peak and a first negative signal peak is measured.
A power tool for driving a working tool (3) that penetrates at least axially into a to-be-machined material (2), comprising a signal processor (6, 6′) designed to determine a penetration depth (T) of the working tool (3) into the material (2) based on high frequency electromagnetic waves (4);
- and a transducer (5) suitable for exciting and detecting a high-frequency electromagnetic wave (4) propagating axially along the working tool (3) and connected to the signal processor (6, 6′);
- wherein the transducer (5) is formed as a coaxial conductor system whose elongate inner conductor is formed at least partially by the high-frequency conducting power tool (3) and whose sleeve-shaped outer conductor is formed at least partially by a high-frequency conducting housing (7) of the power tool, the inner conductor and outer conductor being insulated from one another with respect to high frequency.
A power tool for driving a working tool (3) that penetrates at least axially into a to-be-machined material (2), comprising a signal processor (6, 6′) designed to determine a penetration depth (T) of the working tool (3) into the material (2) based on high frequency electromagnetic waves (4);
- and a transducer (5) suitable for exciting and detecting a high-frequency electromagnetic wave (4) propagating axially along the working tool (3) and connected to the signal processor (6, 6′);
- wherein the signal processor (6) has a clock generator (12), a high-frequency pulse generator (13) which is suitable for outputting voltage pulses with rise times of less than 120 ps, a fast measurement input (14) which is suitable for detecting voltage signals with sampling times of less than 12 ps, and computing means (15) which contain a controlling algorithm (16) having a runtime module (17) for determining a time difference (Δt) between at least two voltage pulses selected by the measurement input (14).
A power tool for driving a working tool (3) that penetrates at least axially into a to-be-machined material (2), comprising a signal processor (6, 6′) designed to determine a penetration depth (T) of the working tool (3) into the material (2) based on high frequency electromagnetic waves (4);
- and a transducer (5) suitable for exciting and detecting a high-frequency electromagnetic wave (4) propagating axially along the working tool (3) and connected to the signal processor (6, 6′);
- wherein the signal processor (6′) has a variable-frequency high-frequency oscillator (19) which is suitable for stationary oscillations with frequencies greater than 8 GHz, a demodulator (20) for amplitude modulation of the high-frequency signal, a measurement input (14) suitable for detecting the amplitude signal of the high-frequency signal, and computing means (15) containing a controlling algorithm (16) which has a standing wave module (21) for determining the high-frequency-specific standing wave ratio and a distance module (22) for determining a distance (d) based on at least two different high-frequency-specific standing wave ratios.
A measurement method of determining the penetration depth (T) of a working tool (3) penetrating at least axially into a to-be-machined material, comprising the steps of providing a power tool for driving a working tool (3) that penetrates at least axially into a to-be-machined material (2), comprising a signal processor (6, 6′) designed to determine a penetration depth (T) of the working tool (3) into the material (2) based on high frequency electromagnetic waves (4);
- and a transducer (5) suitable for exciting and detecting a high-frequency electromagnetic wave (4) propagating axially along the working tool (3) and connected to a signal processor (6, 6′), carrying out a distance measurement up to a free end of the working tool in a first step, with the working tool (3) being exposed, and carrying out a distance measurement up to a surface of the machined material (2) in a second step with the working tool (3) penetrating into the machined material (2);
- wherein the time difference (Δt) between a first positive signal peak and a first negative signal peak is measured.
Dependencies are inferred from the claim text.