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Exploring the Safety Performance of Overhead Crane Brakes

Exploring the Safety Performance of Overhead Crane Brakes

It is understood that the vast majority of crane brakes currently used are hub-type brakes. When it’s time to release or apply the brake, an electromagnet either pulls in or releases, while an oil pump starts or stops—these actions either compress or release the tension of the brake spring. This mechanism causes the brake shoes to either move away from or press firmly against the brake wheel, thereby achieving either the release or application of the brake. However, modern crane operations—especially when lifting large, heavy objects—often require several crew members to stand by as supervisors. Their primary role is to intervene promptly in case of unexpected incidents such as gear disengagement or cable slippage. In such emergencies, they use tools like pry bars to manually increase the pressure exerted by the brake shoes on the brake wheel, enabling rapid and effective emergency braking to minimize damage caused by accidents.

2020-02-13

Introduction to Crane and Derrick Classification

Introduction to Crane and Derrick Classification

Nowadays, society is evolving at a rapid pace—especially since the Fifth Plenary Session of the 18th Central Committee, when rural development has become the top priority. This shift has, in turn, made crane operators a highly sought-after profession. Today, let’s take a moment to summarize what cranes are. While we commonly refer to them simply as "cranes," their official name is actually "crane trucks." These vehicles come in both large and small varieties. The smaller models are essentially compact lifting machines combined with a chassis, designed as versatile transport tools. They consist of key components such as a boom, slewing platform, frame, and outriggers. By operating mechanisms like luffing, telescoping, slewing, and hoisting, these mini cranes perform a range of mechanical movements—movements that can be skillfully combined to tackle various tasks effectively.

2020-02-13

Summary of Loose Bridge Crane Trolley Rail Issues

Summary of Loose Bridge Crane Trolley Rail Issues

During maintenance work, operators often encounter the issue of loose bridge crane trolley tracks. Let’s analyze the causes of this phenomenon from the following perspectives: 1. **Trolley Asynchrony** - Differences in braking timing between the wheels on either side of the trolley lead to uneven stopping times, causing the bridge structure to twist and sway. In severe cases, this can even result in wheel flange wear against the rail. - Under such conditions, the trolley wheels generate friction forces along the main beam direction—perpendicular to the trolley track—which ultimately contributes to the loosening of the track.

2020-02-13

Crane Slip-Contact Line Fault Handling Summary

Crane Slip-Contact Line Fault Handling Summary

1. Summary of Overhead Crane Slide Contact Line Fault Handling: - Main cause of sparking inside the slide contact line rail: Poor contact between the brush surface and the rail. - Solution: Inspect rail joints and properly grind the brushes to ensure 60% contact area. 2. Major Reasons for Excessive Vibration During Operation of the Slide Contact Line: - The fork cannot effectively absorb transmission errors. - The straightness of the rail’s central line is insufficient. - The suspension bracket is loose.

2020-02-13

Kalmar secures additional order for 15 all-electric gantry cranes in Greece

Kalmar secures additional order for 15 all-electric gantry cranes in Greece

Kalmá has secured an additional order for 15 fully electric gantry cranes from Piraeus Container Terminal (PCT) in Greece, a wholly owned subsidiary of COSCO Pacific Limited. This new order has been included in Cargotec’s third-quarter backlog and is valued at nearly €20 million (approximately RMB 140 million). Kalmá previously delivered 12 fully electric gantry cranes to PCT in 2013 and another 9 in 2015.

2020-02-13

The construction machinery industry faces significant downward pressure, but its outlook remains bright.

The construction machinery industry faces significant downward pressure, but its outlook remains bright.

Currently, China's economic situation remains generally sluggish, and the construction machinery industry— an important segment of China's equipment manufacturing sector—continues to operate at a low level. According to recent reports, in the first half of 2015, 18 listed companies specializing in construction machinery and key components generated total operating revenue of 50.009 billion yuan, marking a 29.31% drop compared to 70.744 billion yuan in the first half of 2014. Meanwhile, these 18 listed firms collectively reported a net loss of 590 million yuan for the first half of the year— a stark contrast to the 3.96 billion yuan profit recorded during the same period in 2014, representing a year-on-year decline of 114.89%. Industry insiders warn that companies are facing significant pressures from high levels of fixed asset investment, rising accounts receivable, and increasing inventory levels.

2020-02-13

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Wind power equipment: Keep half your mind awake, and let the other half drift in a dreamy haze.

2020-02-13

The industry is experiencing explosive growth, reshaping the competitive landscape of the wind power equipment sector.

2020-02-13

The Ministry of Finance clarifies the detailed rules for the use of special funds allocated to the wind power equipment industry.

2020-02-13

Three Major Favorable Policies Supporting the Machinery Industry in 2009

2020-02-13

National Administration of Quality Supervision: Notice on Opinions Regarding the Rectification Work for Metallurgical Lifting Machinery

2020-02-13

A 4 trillion yuan investment boost fuels hopes for the lifting equipment industry's rebirth.

2020-02-13

Chengdu Chengde Heavy Forging Co., Ltd.

Contact: Mr. Feng
Mobile phone: +86-13982279038
Landline: +86-2883066386

Mobile phone: +86-18980030810 (Sales Director, Minister Wang)

Mailbox: 423136809@qq.com
Address: Jinniu Village, Xinmin Town, Xindu District, Chengdu City, Sichuan Province

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