How does a hoist brake work?
The hoist brake is to quickly stop rotating parts through friction. Depending on their construction and application, industrial brakes can be categorized into various types, such as disc brakes, drum brakes, and band brakes. Regardless of type, their core operating principle is to achieve braking by converting kinetic energy into heat through friction between a braking element (such as a brake pad or band) and a rotating part (such as a brake disc or drum).
Specifically, when the brake receives a braking signal, the braking element, under the influence of an external force (such as air pressure, hydraulic pressure, or electromagnetic force), rapidly compresses the rotating part, generating sufficient friction to slow the rotating part to a stop. During this process, the brake must withstand high temperatures and pressures to ensure reliable operation even under extreme conditions.
Common hoist brakes are mainly divided into three types: hydraulic disc brakes, hydraulic drum brakes and electromagnetic brakes.
How to maintain hoist brakes
As a key safety component when the winch is working, the brake requires regular maintenance to ensure its reliability.
Regular Inspection
Follow the instructions in the manual and adjust the operating stroke of the brake spring and shoe to ensure they engage when power is off and release when power is on.
01
Keep clean
The working surface of the brake wheel must be flat and smooth. The contact area between the brake shoe and the brake wheel should be no less than 80%. Oil and water should be avoided from contaminating the brake wheel, causing slippage and brake failure.
02
Check key components
If a spring cracks or deforms and doesn't rebound, the damaged component should be replaced. Check the tile wear frequently; if the wear exceeds 2mm, replace it promptly.
03
Avoid common problems
Keep brake pads away from water and oil. If you experience slippage or malfunction, immediately shut down the vehicle and make repairs.
04
Below is a table to help you quickly understand when it is time to replace important brake parts.
| Check components | Replacement Standard | Remarks |
| friction linings | Replace when wear reaches 50% of the original lining thickness. | Asbestos brake pads should be replaced when wear exceeds 2mm. |
| Brake Wheels | Replace when surface wear reaches 2-3mm. | The brake wheel's running surface should remain flat and smooth. |
| Springs |
Replace immediately if cracks or plastic deformation occur. |
Springs should also be replaced if permanent deformation occurs. |
| Pin/Axle Hole | Replace when diameter wear reaches 5% of the original diameter. | Severe wear on the pins and axle holes will increase the lost travel of the brake solenoid. |
| Brake Clearance | Adjust the clearance between the brake shoe and the brake wheel if it exceeds 0.8-1.6mm. | Uneven clearance can also cause uneven wear and requires adjustment. |
| Abnormal Operation | Poor braking performance, vehicle slippage, or excessive brake tension that prevents full release. | The center error between the brake wheel and the brake shoe is too large (greater than 3mm) or the centerline is tilted. |
Hoist brakes advantages
Hoist brakes are widely used in various types of cranes, tower cranes, gantry cranes, and other equipment, offering the following advantages:
High Reliability: They provide strong braking in emergency situations, preventing loads from sliding and ensuring the safety of personnel and equipment.
High Automation: The normally closed design allows the drum brake to automatically apply the brake in the event of a malfunction or shutdown, reducing the risk of human error.
High Adaptability: Hydraulically and electromagnetically actuated drum brakes are suitable for cranes of varying sizes and can meet the requirements of high loads and high-frequency operation.
Easy Maintenance: The drum brake's simple design allows for easy maintenance, allowing friction pad replacement and drive system inspection as needed to ensure long-term stable operation.
01
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