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An electric hammer and its control method

A control method and electric hammer technology, applied in the direction of manufacturing tools, motor generators/starters, motor parameter estimation/correction, etc., can solve the problems of electric hammer starting current increase controller, electric hammer starting failure, etc. Achieve the effect of reducing the starting current of the electric hammer and solving the failure of starting at low temperature

Active Publication Date: 2022-07-19
HUIZHOU TOPBAND ELECTRICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides an electric hammer and its control method, which aims to solve the problem that the starting current of the electric hammer increases due to the solidification of butter at low temperature, and the controller enters the overcurrent protection, which makes the electric hammer fail to start.

Method used

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  • An electric hammer and its control method
  • An electric hammer and its control method
  • An electric hammer and its control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] see figure 1 , is a schematic flowchart of the control method of the electric hammer provided in the first embodiment of the present invention, and the method includes the following steps:

[0029] Step S01, it is judged whether the electric hammer is in a start-up state.

[0030] The starting state of the electric hammer in this embodiment refers to a state between when the motor of the electric hammer starts to rotate and works normally. Whether the hammer is in the starting state can be judged by whether the motor of the hammer is rotating.

[0031] Specifically, the number of commutation steps of the motor is monitored in real time, and when the number of commutation steps of the motor is greater than zero, the motor rotates and the electric hammer is in the starting state. In addition, by adding a start button feedback, a start signal can be triggered when the start switch is turned on, and the controller can judge the current state of the electric hammer accordi...

Embodiment 2

[0047] Further, see figure 2 , is a schematic flowchart of a control method of an electric hammer provided in the second embodiment of the present invention. The difference between the second embodiment and the first embodiment is that the electric hammer includes a switch for controlling the starting current, and the size of the starting current is related to the switching range of the switch. The data is positively correlated. After step S04 in the first embodiment, the method further includes:

[0048] Step S05 , acquiring the current output duty ratio of the electric hammer in the low-temperature startup current-limiting mode.

[0049] Step S06, receiving the switch range data converted by pressing the switch, and reducing the current of the electric hammer according to the switch range data.

[0050] In step S07, the conversion output duty ratio is calculated and obtained according to the reduced current.

[0051] Step S08, judging whether the conversion output duty cycl...

Embodiment 3

[0056] see image 3 , is a schematic flowchart of a control method for an electric hammer provided in Embodiment 3 of the present invention. The difference between Embodiment 3 and Embodiment 1 is that after step S04 in Embodiment 1, the method further includes:

[0057] Step S010, detecting the operating time of the electric hammer in the low-temperature startup current-limiting mode.

[0058] Step S011, determining whether the running duration is greater than a preset duration.

[0059] Step S012, if yes, control the electric hammer to exit the low temperature startup current limiting mode.

[0060] It is understandable that when the electric hammer enters the low temperature start current limiting mode, the current of the electric hammer has been limited. When the electric hammer has been started at low temperature, the user may not know when or forget to control the electric hammer. Exiting this current-limiting mode will cause the hammer to remain in a low current condi...

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PUM

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Abstract

The invention provides a control method of an electric hammer, comprising the steps of: judging whether the electric hammer is in a starting state; if so, obtaining the starting current of the electric hammer and the number of commutation steps of the motor; judging whether the starting current is greater than a low-temperature starting current threshold, and Whether the number of motor commutation steps is less than the threshold of commutation steps; if so, control the hammer to enter the low-temperature start current-limiting mode, and start with the current limited by the low-temperature start current-limiting mode. The present invention also provides an electric hammer. In the control method of the present invention, the electric hammer is started with the current limited by the low temperature current limiting mode, so as to reduce the starting current of the electric hammer, and prevent the controller of the electric hammer from entering the overcurrent protection due to the excessive starting current of the electric hammer. As a result, the electric hammer fails to start, which effectively solves the problem that the electric hammer fails to start at low temperature.

Description

technical field [0001] The invention relates to the technical field of electromechanical equipment, in particular to an electric hammer and a control method thereof. Background technique [0002] The electric hammer is a widely used electric construction tool. It is based on the electric drill, adding a piston with a crankshaft connecting rod driven by an electric motor, and reciprocatingly compresses air in a cylinder, so that the air pressure in the cylinder changes periodically. The changing air pressure drives the hammer in the cylinder to reciprocate against the top of the drill bit, which is equivalent to hitting the drill bit with a hammer, hence the name electric hammer. [0003] As a type of electric drill, the electric hammer is widely used for rapid reciprocating motion along the direction of the drill bit while the drill bit is rotating, so it is widely used in the brittle concrete, floor, brick wall, stone and other materials. Punch holes. [0004] However, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25D11/00B25D17/00H02P1/16H02P23/14
CPCB25D11/00B25D17/00H02P1/16H02P23/14
Inventor 何柱铭
Owner HUIZHOU TOPBAND ELECTRICAL TECH CO LTD