Load-based control of breaker machine

Patent metadata

Field	Value
Publication number	US-11065753-B2
Application number	US-201716077204-A
Country	US
Kind code	B2
Filing date	Feb 6, 2017
Priority date	Feb 16, 2016
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

A breaker machine includes a power source, a tool holder arranged to receive a tool and a power driven striking mechanism arranged to strike a tip of the tool with a striking frequency on a hard surface. The breaker machine further includes control circuitry arranged to control an output from the power source and load detection means arranged to detect the load of the power source and transmit information relating to the detected load of the power source to the control circuitry. The control circuitry is arranged to receive information relating to a load of the power source, select a striking frequency based on the information relating to the load of the power source and to apply the selected striking frequency by ramping a current striking frequency to the selected striking frequency based on a predetermined ramping scheme by controlling the output from the power source.

First claim

The invention claimed is:

1. A breaker machine comprising:
a power source,
a tool holder configured to receive a tool,
a power driven striking mechanism configured to strike a tip of the tool with a striking frequency on a hard surface,
control circuitry configured to control an output from the power source, and
a load detector configured to detect the load of the power source and transmit information relating to the detected load of the power source to the control circuitry,
wherein the control circuitry is configured to receive the information relating to the load of the power source,
wherein the control circuitry is further configured to select a striking frequency based on the information relating to the load of the power source and to apply the selected striking frequency by ramping a current striking frequency to the selected striking frequency based on a predetermined ramping scheme by controlling the output from the power source,
wherein the predetermined ramping scheme comprises at least two different ramping rates when ramping the current striking frequency to the selected striking frequency,
wherein the control circuitry is further configured to provide an idling striking frequency below 10 Hz.

2. The breaker machine according to claim 1 , wherein the power source comprises an electric motor.

3. The breaker machine according to claim 1 , wherein the control circuitry is programmable.

4. The breaker machine according to claim 3 , wherein the load detector comprises a power analyzer configured to determine an input power to the power source.

5. The breaker machine according to claim 1 , wherein the breaker machine comprises storage means having stored thereon information relating to a predetermined measure of a highest mechanical output power of the power source.

6. The breaker machine according to claim 1 , wherein the breaker machine is configured to determine a load of the power source based on information relating to an input power to the power source and information relating to a predetermined measure of a highest mechanical output power of the power source.

7. A breaker machine comprising:
a power source,
a tool holder configured to receive a tool,
a power driven striking mechanism configured to strike a tip of the tool with a striking frequency on a hard surface,
control circuitry configured to control an output from the power source, and
a load detector configured to detect the load of the power source and transmit information relating to the detected load of the power source to the control circuitry,
wherein the control circuitry is configured to receive the information relating to the load of the power source,
wherein the control circuitry is further configured to select a striking frequency based on the information relating to the load of the power source and to apply the selected striking frequency by ramping a current striking frequency to the selected striking frequency based on a predetermined ramping scheme by controlling the output from the power source,
wherein the control circuitry is programmable, and
wherein the load detector comprises a multi-meter arranged to measure an input voltage, an input electric current and an efficiency measure of the power source separately.

8. A method performed in a control circuitry of a breaker machine comprising a power source, a tool holder configured to receive a tool and a power driven striking mechanism configured to strike a tip of the tool with a striking frequency on a hard surface, comprising the steps of:
receiving information relating to a load of the power source from a load detector arranged to detect the load of the power source,
selecting a striking frequency based on the information relating to the load of the power source, and
applying the selected striking frequency by ramping a current striking frequency to the selected striking frequency based on a predetermined ramping scheme for controlling an output from the power source, wherein the predetermined ramping scheme comprises at least two different ramping rates when ramping the current striking frequency to the selected striking frequency,
wherein an idling striking frequency is provided below 10 Hz.

9. A non-transitory computer-readable storage medium comprising computer program code which, when executed, causes a control circuitry of a breaker machine to execute the method of claim 8 .

Assignees

• Atlas Copco Airpower Nv

Inventors

• Danielsson Torkel
• Karlsson Magnus

Classifications

• B25D11/00 Primary

  Portable percussive tools with electromotor {or other motor} drive · CPC title

• B25D2250/221

  Sensors · CPC title

• B25D11/005 Primary

  Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface · CPC title

• B25D2250/091

  Electrically-powered tool components · CPC title

• B25D2250/201

  for speed, e.g. drilling or percussion speed · CPC title