Rotary braking system and tower crane control system

A technology of slewing braking and control system, applied in the field of frequency conversion control, can solve problems such as accidents, loss of control of slewing mechanism, failure of eddy current coil power failure, etc., and achieve the effect of preventing failure

Active Publication Date: 2015-04-29
SHENZHEN INVT ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing slewing braking system realizes the slewing action of the boom by performing variable frequency drive and eddy current braking on the eddy current motor (currently using a wound asynchronous motor with eddy current coils). In the event of a fault (such as grid phase loss or instantaneous power failure, etc.), the eddy current coil will fail to be powered off, and eddy current braking cannot be performed, which will cause the slewing mechanism to lose control and cause an accident

Method used

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  • Rotary braking system and tower crane control system
  • Rotary braking system and tower crane control system
  • Rotary braking system and tower crane control system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] see Figure 1a-1b , Embodiment 1 of the present invention discloses a slewing braking system to prevent eddy current braking failure and out-of-control risks caused by grid power outages or failures (such as grid phase loss or instantaneous power failure, etc.), including slewing Brake brake circuit 110 and rotary eddy current brake circuit 120;

[0035] The slewing brake braking circuit 110 includes: a switch KM that is automatically closed when the power grid suddenly loses power or fails, a first transformer 111, a rectifier circuit 112 and a brake switch 113 connected in series between the power grid and the slewing brake power supply of the tower crane, and connected to the first storage battery 114 of the slewing brake power supply via the switch KM and the brake switch 113;

[0036] Among them, the switch KM can be automatically controlled by the electric control part of the tower crane. The switch KM is preferably the total contactor KM of the tower crane. self...

Embodiment 2

[0075] see figure 2 , Embodiment 2 of the present invention discloses another rotary braking system to prevent the risk of eddy current braking failure and loss of control caused by power failure or failure of the grid, including a rotary braking circuit 110 and a rotary eddy current braking circuit 120 ;

[0076] The slewing brake circuit 110 includes: a first controllable rectifier circuit 111 and a brake switch 112 connected in series between the grid and the slewing brake power supply of the tower crane;

[0077] The rotary eddy current braking circuit 120 includes a grid power supply circuit L1 and a battery power supply circuit L2, wherein:

[0078] The grid power supply circuit L1 includes a second controllable rectifier circuit 121 and an external control relay KA1 connected in series between the grid and the eddy current coil of the eddy current motor, but not limited thereto;

[0079] The storage battery power supply circuit L2 includes a transformer 122 connected...

Embodiment 3

[0083] see image 3 , Embodiment 3 of the present invention discloses a tower crane control system to prevent the risk of eddy current braking failure and loss of control caused by power outage or failure of the power grid, including an eddy current motor M1, a frequency converter 10 for driving the eddy current motor M1, And a rotary braking system 20 for braking the eddy current motor M1; wherein, the rotary braking system 20 adopts the structure disclosed in the first embodiment.

[0084] The tower crane control system adopts frequency conversion drive and eddy current braking for the eddy current motor M1 to realize the slewing action of the boom. In terms of variable frequency drive, the operating signals (such as zero position, left turn, right turn, second gear, third gear, fourth gear) and fault reset signals sent by the master controller of the cab are connected to the switching value of the inverter 10. Input port, by monitoring the different states of the master co...

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Abstract

The invention discloses a rotary braking system and a tower crane control system. The rotary braking system comprises a rotary braking circuit and a rotary eddy current braking circuit, wherein the rotary braking circuit comprises a switch, a first transformer, a rectifying circuit, a brake switch and a first storage battery; the switch is automatically switched on when sudden power failure of the power grid is caused or when the power grid fails; the first transformer is connected in series between the power grid and a rotary braking power supply of the tower crane; the first storage battery is connected to the rotary braking power supply by virtue of the switch and the brake switch; the rotary eddy current braking circuit comprises a power grid power supply circuit and a storage battery power supply circuit; and the storage battery power supply circuit comprises a second transformer connected in series between the power grid and an eddy current coil of the eddy current motor, a rectification filter circuit, a charging circuit, a second storage battery, an internal control relay, and a relay control circuit connected with the internal control relay. According to the systems disclosed by the invention, the eddy current braking failure and out-of-control risk caused by the power failure or fault of the power grid can be effectively avoided.

Description

technical field [0001] The invention relates to the technical field of frequency conversion control, more specifically, to a slewing brake system and a tower crane control system. Background technique [0002] Tower cranes are commonly used lifting equipment on construction sites. The boom of the tower crane is a common slewing mechanism. It is characterized by a large impact inertia, and the impact is large if it is started too fast. Stopping and reverse rotation are not allowed. Too fast, otherwise it will not only run smoothly, but also damage the mechanism. [0003] The existing slewing braking system realizes the slewing action of the boom by performing variable frequency drive and eddy current braking on the eddy current motor (currently using a wound asynchronous motor with eddy current coils). In the event of a fault (such as a phase loss in the power grid or a momentary power failure), the eddy current coil will fail to be powered off, and eddy current braking will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66C23/84B66C13/22
CPCB66C13/22B66C23/84B66C2700/00
Inventor 李炳峰
Owner SHENZHEN INVT ELECTRIC
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