A power tool and a detection method for the power tool. The detection method includes collecting acceleration data, via use of an acceleration sensor of the power tool, along a tangential direction of a rotation axis of a working portion of the power tool, determining whether a proportion of the collected acceleration data that exceeds a first acceleration threshold in a preset time window exceeds a preset value, and determining that a kickback occurs in the power tool when the proportion exceeds the preset value.

The invention relates to a system for monitoring the state of a cable (70), which is guided in an energy chain (1) between a base and a movable driver element. The movable energy chain forms a movable run (1B) at a driver element (2), a resting run (1A) at a base (4) and, between the two runs, a deflecting bend (1C). A monitoring device having at least one indicating element (64) at the energy chain (1) evaluates an indicating-element signal and monitors whether an error state occurs. The indicating element has two electrical indicating conductors (62A, 62B) guided by the energy chain, which indicating conductors extend along the movable run (1B), and the monitoring device comprises a measuring circuit for resistance measurement or conductance measurement (65 . . . 69). One end point of each indicating conductor (62A, 62B) is connected to the measuring circuit and the other end points of the indicating conductors (62A, 62B) are short circuited such that the indicating conductors (62A, 62B) form a measurement loop (62).

An emergency stop system for suppressing the possibility that an emergency stop state of a machine is released due to the shock of the falling of an emergency stop switch that stops an operation of the machine in an emergency is provided. The emergency stop system includes: a fall detection unit that detects falling of an emergency stop switch on the basis of a detection value obtained by an acceleration sensor; a shock detection unit that detects shock after the falling of the emergency stop switch on the basis of the detection value of the acceleration sensor; a switch state detection unit that detects an ON-OFF state of the emergency stop switch; and a signal output unit that outputs an emergency stop signal to the machine regardless of the ON-OFF state of the emergency stop switch when the switch state detection unit has detected switching of the ON-OFF state of the emergency stop switch within a predetermined period after the fall detection unit detected the falling and the shock detection unit detected the shock.

An emergency stop system for suppressing the possibility that an emergency stop state of a machine is released due to the shock of the falling of an emergency stop switch that stops an operation of the machine in an emergency is provided. The emergency stop system includes: a fall detection unit that detects falling of an emergency stop switch on the basis of a detection value obtained by an acceleration sensor; a shock detection unit that detects shock after the falling of the emergency stop switch on the basis of the detection value of the acceleration sensor; a switch state detection unit that detects an ON-OFF state of the emergency stop switch; and a signal output unit that outputs an emergency stop signal to the machine regardless of the ON-OFF state of the emergency stop switch when the switch state detection unit has detected switching of the ON-OFF state of the emergency stop switch within a predetermined period after the fall detection unit detected the falling and the shock detection unit detected the shock.

A collision prevention control system based on an electric lifting table and a collision prevention method thereof are provided. The collision prevention control system includes a lifting table, an electronic lifting table control box disposed on the lifting table, and a single-chip microcomputer disposed in the electric lifting table control box. The electric lifting table control box is internally provided with an acceleration and gyroscope chip, the acceleration and gyroscope chip performing synchronous motion with the lifting table, the acceleration and gyroscope chip being in information interaction with the single-chip microcomputer, and motion control on the lifting table being performed through the single-chip microcomputer. The collision prevention control system has the advantageous effects as follows: has higher sensitivity and more reliable operation, and senses a slight angular change or an acceleration change when the lifting table encounters resistance.

An emergency stop system for suppressing the possibility that an emergency stop state of a machine is released due to the shock of the falling of an emergency stop switch that stops an operation of the machine in an emergency is provided. The emergency stop system includes: a fall detection unit that detects falling of an emergency stop switch on the basis of a detection value obtained by an acceleration sensor; a shock detection unit that detects shock after the falling of the emergency stop switch on the basis of the detection value of the acceleration sensor; a switch state detection unit that detects an ON-OFF state of the emergency stop switch; and a signal output unit that outputs an emergency stop signal to the machine regardless of the ON-OFF state of the emergency stop switch when the switch state detection unit has detected switching of the ON-OFF state of the emergency stop switch within a predetermined period after the fall detection unit detected the falling and the shock detection unit detected the shock.

An emergency stop system for suppressing the possibility that an emergency stop state of a machine is released due to the shock of the falling of an emergency stop switch that stops an operation of the machine in an emergency is provided. The emergency stop system includes: a fall detection unit that detects falling of an emergency stop switch on the basis of a detection value obtained by an acceleration sensor; a shock detection unit that detects shock after the falling of the emergency stop switch on the basis of the detection value of the acceleration sensor; a switch state detection unit that detects an ON-OFF state of the emergency stop switch; and a signal output unit that outputs an emergency stop signal to the machine regardless of the ON-OFF state of the emergency stop switch when the switch state detection unit has detected switching of the ON-OFF state of the emergency stop switch within a predetermined period after the fall detection unit detected the falling and the shock detection unit detected the shock.

A power tool and a detection method for the power tool. The detection method includes collecting acceleration data, via use of an acceleration sensor of the power tool, along a tangential direction of a rotation axis of a working portion of the power tool, determining whether a proportion of the collected acceleration data that exceeds a first acceleration threshold in a preset time window exceeds a preset value, and determining that a kickback occurs in the power tool when the proportion exceeds the preset value.

A collision stress releasing device reversely rotates a feed motor by a return amount set in a return amount setter based on a contact position of a movement unit or a collision detection position regarded as a contact position. Generally, a large error does not occur even when the collision detection position is regarded as the contact position, but when the movement unit or the colliding member has low rigidity, a control of setting a return amount in response to the speed of the movement unit or a control of estimating an actual contact position from a rise curve of a load after a collision is more desirable.

A collision stress releasing device reversely rotates a feed motor by a return amount set in a return amount setter based on a contact position of a movement unit or a collision detection position regarded as a contact position. Generally, a large error does not occur even when the collision detection position is regarded as the contact position, but when the movement unit or the colliding member has low rigidity, a control of setting a return amount in response to the speed of the movement unit or a control of estimating an actual contact position from a rise curve of a load after a collision is more desirable.