Tower crane and slewing power loss protection device
A tower crane, power loss protection technology, applied in cranes, transportation and packaging, etc., can solve problems such as hidden safety hazards, uncontrollable, power failure of tower cranes, etc.
Active Publication Date: 2017-07-18
HUNAN SANY TOWER CRANE CO LTD
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Problems solved by technology
[0005] In view of this, the present invention proposes a tower crane and a slewing power loss protection device to solve the problem that the tower crane cannot be controlled after a sudden power failure during high-speed slewing, and there are potential safety hazards
Method used
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[0034] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0035] The basic idea of the present invention is: in order to overcome the shortcomings of uncontrollable and potential safety hazards after a sudden power failure during the high-speed rotation of the tower crane, the present invention provides a protection device for power loss in rotation. The protection circuit is used to keep the disc brake of the tower crane in the open state when the tower crane suddenly loses power. Therefore, when the slewing mechanism of the tower crane is running at high speed, it can quickly and softly make the slewing mechanism Stop and effectively prevent the occurrence of collision accidents caused by inertia, and the investment is small, safe and reliable.
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The invention discloses a rotation power loss protection device and a tower crane. The rotation power loss protection device comprises a storage batter, a first switch, a second switch, a rotation motor brake coil circuit, a follow current wave-proof circuit and a power loss emergency protection circuit, wherein the rotation motor brake coil circuit, the follow current wave-proof circuit and the power loss emergency protection circuit are arranged in parallel; the cathode of the storage battery is connected with the input end of the follow current wave-proof circuit and the output end of the rotation motor brake coil circuit; the anode of the storage battery is connected with the output end of the follow current wave-proof circuit and the input end of the rotation motor brake coil circuit; when the tower crane normally works, the first switch is turned on, and is automatically turned off after power loss; when the tower crane normally works, the second switch is turned off, and is turned on in a delayed manner after power loss; and the power loss emergency protection circuit is used for keeping a disc brake of the tower crane in an open state when the tower crane suddenly loses power. The rotation power loss protection device has the advantage that after sudden power failure, a rotation mechanism automatically, safely, quickly and softly stops, so that collision accidents and whole machine impact are avoided.
Description
technical field [0001] The invention relates to the field of construction machinery, in particular to a tower crane and a slewing power loss protection device. Background technique [0002] The slewing brake of the tower crane is divided into two types: open brake and normally closed brake. The normally open brake coil brakes when it is energized, and the normally closed brake coil brakes when it is powered off. In order to resist the wind when not in use, the tower crane must release the slewing brake. The normally open brake will automatically release the brake when the power is turned off, and the normally closed brake must be manually released after the power is turned off. Therefore, most tower cranes use normally open brakes. In order to lock the slewing even when there is no power, some tower cranes with normally open brakes will be equipped with batteries as backup power for the slewing brake. Regardless of whether it is a normally open brake or a normally closed b...
Claims
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IPC IPC(8): B66C23/94
CPCB66C23/94B66C2700/0392
Inventor 田清文姜连才封华
Owner HUNAN SANY TOWER CRANE CO LTD