Motor-operated crane drive

Patent metadata

Field	Value
Publication number	US-10865082-B2
Application number	US-201615762339-A
Country	US
Kind code	B2
Filing date	Sep 23, 2016
Priority date	Sep 23, 2015
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

The invention relates to a motor-operated crane drive in which a more rapidly rotating motor (1) drives a more slowly rotating cable drum (3) via a transmission (3). A safety brake (5) is arranged on the more slowly rotating side of the transmission (2). A signal that is used for actuating the safety brake (5) is utilized for initiating an electrical deceleration of the motor (1).

First claim

The invention claimed is:

1. A method for operating a motor-driven crane drive, said method comprising:
arranging a safety brake on a slower-rotating side of a gear unit placed between a faster-rotating electric motor and a slower-rotating rope drum; and
when an emergency stop signal is activated to trigger the safety brake, initiating electric braking of the electric motor by controlling the electric braking with a frequency converter before the safety brake engages in response to the emergency stop signal.

2. The method of claim 1 , wherein the emergency stop signal is received in a control device, and the control device generating and determining a timing delay of the emergency stop signal with respect to initiating electric braking.

3. A motor-driven crane drive, comprising:
a rope drum;
a control device;
an electric motor driving the rope drum;
a gear unit operatively connecting the rope drum with the electric motor;
a safety brake arranged on a slower-rotating side of the gear unit; and
an emergency stop switch operably connected to the control device, with the control device configured to generate, upon actuation of the emergency stop switch, an emergency stop signal which triggers the safety brake and a further signal which initiates electric braking of the electric motor wherein the further signal initiates the braking of the electric motor before the safety brake engages in response to the emergency stop signal.

4. The motor-driven crane drive of claim 3 , further comprising a frequency converter configured to control the electric braking of the electric motor.

5. The motor-driven crane drive of claim 4 , wherein the emergency stop signal activates the safety brake and thereby cause a braking of the rope drum, and the further signal is transmitted to the frequency converter to cause the electric braking of the electric motor.

Assignees

• Flender Gmbh

Inventors

• Kube Andreas

Classifications

• B66D1/14 Primary

  Power transmissions between power sources and drums or barrels {(including brakes, one-way brakes, one-way clutches, clutches activated alternately with brakes, fixed ratio gearing unless otherwise provided for in B66D1/16 - B66D1/24)} · CPC title

• B66D1/54 Primary

  Safety gear · CPC title

• B66D1/485

  electrical · CPC title

• B66D5/00

  Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads (for pulley blocks B66D3/10) · CPC title

• B66D1/12

  incorporating electric motors · CPC title