Fault detecting method for braking device

Abstract

The invention discloses a fault detecting method for a braking device. The fault detecting method is used for comprehensively detecting and diagnosing the action matching reliability of all sectors on a brake shoe and a brake drum. The fault detecting method comprises the steps of sequentially carrying out static detection and dynamic detection on the braking device; during static detection, applying a torque current with a specific direction to a traction machine in a brake closing state, and observing the slip condition of a traction wheel; during dynamic detection, setting the switching sequence of the sectors through a sector management unit, releasing the brake, and driving the traction machine to rotate; and when the traction machine rotates for a certain mechanical angle, stopping the brake, meanwhile, cutting off a power source of the traction machine, and observing the braking- stopping distance of the traction machine from rotating to stopping. The fault condition of the braking device is diagnosed through judging static and dynamic detection results on all the sectors. The fault detecting method is high in diagnosis coverage rate and capable of checking slight abnormality of the braking device, achieving the aim of nipping in blossom and effectively avoiding accidents caused by failure of the braking device.

Description

technical field [0001] The invention relates to a fault detection method of a braking device. Background technique [0002] At present, there are many technologies about braking force detection in the domestic industry, but there are certain defects. [0003] For example, in patents 200810094853.0 and 02829758.X, the test can only be carried out on a specific floor, and the resistance test of the elevator is required before the test to determine the test torque of the elevator, which makes the testing process complicated and has many restrictions and low flexibility; [0004] Another example is patent 200810037218.9. This technology applies diagnostic and pre-diagnostic torque to the motor under the braking state, and judges the braking force by detecting the slippage of the car. However, it can only detect the braking force of the braking surface where the brake shoe is located. However, the braking condition of the entire braking device cannot be fully detected. For motor...

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Problems solved by technology

However, since the braking force of the brake is far beyond the output torque capacity of the elevator inverter in normal times, in order to realize this technology, it is necessary to use a larger-capacity inverter, so the economic benefit is low

[0006] At the same time, the above technologies still have the following deficiencies: insufficient consideration of the effective mode of braking, such as the oil leakage of the main engine, the oil throwing of the wire rope, and the rusting of the brake drum, so that the local surface of the brake drum is covered with oil, affecting the brake drum. Partial braking force, and in the early stage of the accident, the probability of insufficient braking force is relatively low through the above-mentioned technology, so it cannot be prevented, and it is easy to leave safety hazards and cause safety accidents

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