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The Development Trends of Technology in the Industrial Brake Industry
(1) Brake Actuation Method
The primary driving method for brakes is Electro-Hydraulic Actuators, followed by AC or DC electromagnets, with a smaller number utilizing hydraulic drives and pneumatic devices. Thanks to their advantages—such as minimal impact, low operational noise, simple control, long service life, and low operating costs—Electro-Hydraulic Actuators have become the mainstream choice for high-speed shaft industrial brakes. In the realm of safety brakes, however, hydraulic-driven brakes remain the dominant option.
(2) The Function of the Brake
As equipment evolves toward larger and ultra-large-scale designs, as well as specialization and highly efficient automation, brakes are rapidly advancing to meet the demands of heavy-duty braking conditions, while also becoming more multifunctional, intelligent, and maintenance-free. The shift toward heavy-duty braking is driven by the need to support large-scale and ultra-heavy-load mechanisms. Meanwhile, multi-functionality now encompasses features such as brake release interlock systems, manual release capabilities, wear-limit monitoring (with interlock functionality), and automatic wear compensation—all designed to enhance both safety and performance. Intelligent design integrates digital and computer technologies into the control system, while "maintenance-free" solutions replace manual adjustment requirements with automated processes, ensuring reliable operation and performance. Additionally, enabling real-time maintenance of industrial brakes through remote monitoring represents a key emerging trend in brake technology development.
(3) Safety Brake
The safety brake is a mechanical braking device installed on the final-stage shaft of the transmission system (such as the drum shaft), and it is typically used only in critical lifting mechanisms—like crane hoisting systems, boom luffing mechanisms, and incline-type belt conveyors. Since the 1980s, with the rapid advancement of lifting and material-handling machinery toward larger and even ultra-large-scale designs, as well as increased specialization, efficiency, and automation—or semi-automation—applications of safety brakes have also seen significant growth. Today, safety brakes are widely adopted in large-scale, specialized port handling equipment, and their use is steadily expanding to advanced lifting devices such as power plant gantry cranes, casting cranes, and cable-suspended crane hoisting systems, as well as incline-type belt conveyors.
Before the mid-1990s, China virtually had no domestic safety brakes. However, since the mid-1990s, the rapid advancement in manufacturing technology for large-scale, specialized port handling machinery, coupled with the soaring demand in the market, has spurred the swift development of China's safety brake industry. In just over a decade and a half, China's safety brake technology has already approached or even reached international standards, while the range of product offerings continues to expand steadily.
(4) Friction Materials
Friction materials, which refer to composite materials containing multiple components, are one of the core technologies in industrial brakes. The coefficient of friction is a key performance indicator of these materials, closely tied to factors such as the surface condition of the material, the medium, or the surrounding environment. Ultimately, the quality and friction performance of friction materials directly influence the operational effectiveness of the brake system.
Before the 1990s, asbestos brake linings were the primary friction materials used. However, since asbestos is a carcinogenic substance, asbestos-free organic (NAO) composite friction materials quickly replaced asbestos-based ones. As braking systems faced increasingly demanding operating conditions—such as heavier loads—their accompanying brake pads needed to meet stringent requirements: excellent resistance to high temperatures, superior wear resistance, consistently high and stable friction performance, minimal maintenance needs, and extended service life. Consequently, semi-metallic resin-based and powder-metallurgy friction materials gradually became the market’s mainstream products. Today, ceramic-based composite friction materials, with their outstanding high-temperature friction properties and suitability for higher specific pressures, are steadily gaining widespread adoption.
(5) Reliability and Lifespan of the Brake
Before the 1990s, brakes were treated as wear-and-tear components. However, with significant advancements in both the technology and quality of industrial brakes, these devices are now evolving toward greater reliability and longer lifespans that match those of their host machinery components.
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① Friction brakes: These rely on the friction force between the braking component and the moving part to achieve braking. ② Non-friction brakes: The main structural types of these brakes include magnetic powder brakes (which use the shear force generated by magnetizing magnetic powder for braking), magnetic eddy current brakes (whose braking torque can be adjusted by regulating the excitation current), and water eddy current brakes, among others.
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