Auxiliary braking device for magnetic rheological body petroleum drilling rig

An auxiliary brake and variant technology, applied in mechanical equipment, hydraulic resistance brakes, brake types, etc., can solve the problems of not easy to dissipate heat, rapid temperature rise, high manufacturing precision, and overcome the problems of poor low-speed performance, large amount of winding, and high manufacturing low cost effect
CN1945047AActive Publication Date: 2007-04-11BC P INC CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
BC P INC CHINA NAT PETROLEUM CORP
Publication Date
2007-04-11

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Abstract

The auxiliary braking device with magnetic rheological body for petroleum rig includes one cylinder of non-magnetic conductive material and two end caps of magnetic conductive material to form one sealed cylindrical cavity, two magnetic conductive columns with wound exciting coil outside the cylinder and between the two end caps, one shaft of non-magnetic conductive material with fixed magnetic conductive blades set between the two end caps, and magnetic rheological body filled in the sealed cylindrical cavity. The present invention can provide great braking moment at all rig winch speeds, and has stepless regulation of braking moment, fast response, low cost and long service life.
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Description

technical field

[0001] The invention relates to an auxiliary braking device for an oil drilling rig, in particular to an auxiliary braking device for an oil drilling rig using magneto-rheological technology. Background technique

[0002] At present, known auxiliary brake devices for oil drilling rigs include water brakes, electromagnetic eddy current brakes, multi-disc brakes, and Eaton air-controlled brakes.

[0003] Water brake is a kind of auxiliary brake often used by oil drilling rigs. Its braking torque is proportional to the square of the speed. Therefore, the braking torque is very low when running at low speed, which cannot meet the needs of deep well drilling.

[0004] Electromagnetic eddy current braking, such as Chinese patent announcement number: 2079386, provides a kind of novel electromagnetic eddy current braking device. It is composed of motor, transformer, rectifier, stator, stator coil, rotor shaft, cooling water cavity and circulating water cooling devic...

Claims

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