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Does the crane experience rail biting, and how can you easily determine if a crane is experiencing rail biting?

Does the crane experience rail biting, and how can you easily determine if a crane is experiencing rail biting?

Rail-related cause: Poor installation quality of the tracks resulted in excessive deviations between the two rails, inevitably leading to rail biting during crane operation. In such cases, the rail-biting phenomenon typically occurs at specific sections of the track. 1. Excessive relative elevation difference between the two rails: Since there is a significant discrepancy in the relative heights of the two rails, one end beam of the bridge crane ends up higher on one side while the other remains lower. As the crane moves, it tends to shift laterally toward the lower side, triggering rail-biting. On the side where the rail is higher, the wheel flange presses tightly against the outer edge of the rail, causing rail biting; conversely, on the side with the lower rail, the wheel flange squeezes against the inner edge of the rail, also resulting in rail biting.

2020-02-13

How to prevent crane wheels from climbing the rails, with special attention to issues with the trolley brakes and gearboxes.

How to prevent crane wheels from climbing the rails, with special attention to issues with the trolley brakes and gearboxes.

For running mechanisms with either centralized or individual drive systems, the methods to prevent and address crane wheel flange wear on the rails should differ. This can be achieved through careful inspection, meticulous adjustment, and correcting any misalignment in the installation of wheels and rails—paying particular attention to synchronization issues between the motors, brakes, and gearboxes on both sides of individually driven mechanisms. 1. Limit the ratio of bridge span \( L \) to wheel gauge \( K \). During normal operation, overhead cranes allow for a certain degree of free inclination between the wheel flanges and the rails, meaning a small lateral movement is permitted between the wheel flanges and the rail sides (typically 20–30 mm). The greater this clearance, the less likely flange wear will occur.

2020-02-13

China's crane industry is growing rapidly, but the tower foundation sector still lags behind to some extent.

China's crane industry is growing rapidly, but the tower foundation sector still lags behind to some extent.

Looking back at the 60-year development history of China's tower crane industry, we see how it has grown from scratch to become a major player—scaling up in size and sophistication while gradually establishing a comprehensive system and product portfolio. Today, China is capable of producing tower cranes ranging from 100 kN·m to 52,000 kN·m, meeting not only domestic construction project needs but also exporting extensively to markets worldwide, particularly making small-volume exports to developed countries and regions in Europe and North America. As a result, China has firmly established itself as a global leader in tower crane manufacturing. However, in recent years, amid rapidly evolving market dynamics and intense competitive pressures, China's leading tower crane manufacturers have significantly increased their investments in research and development as well as production capabilities. As a consequence, the technological gap between Chinese manufacturers and their international counterparts has narrowed considerably. That said, challenges still remain in terms of overall structural design, performance, and quality.

2020-02-13

Features of metallurgical cranes and the requirements they must meet

Features of metallurgical cranes and the requirements they must meet

To ensure the safe operation of metallurgical bridge cranes, and based on the specific conditions of metallurgical production and operations, these cranes must meet the following requirements: 1. Use electric motors specifically designed for metallurgical cranes; in environments where temperatures exceed 40°C, motors with Class H insulation should be selected. 2. Equip the crane with two independently functioning braking systems (dual braking). 3. A load-limiting device must be installed. 4. Install dual limiters—typically combining weight-based and rotary-type designs—to prevent overtravel at the uppermost position. These limiters should activate separate circuit-breaker systems. Additionally, for cranes with lifting heights exceeding 20 meters, a secondary limiter controlling the lower limit should also be fitted as needed.

2020-02-13

The National Bridge Gantry Crane Quality Inspection Center advances safety brake inspection and testing into the "e-era."

The National Bridge Gantry Crane Quality Inspection Center advances safety brake inspection and testing into the "e-era."

The computer program automatically calculates the required moment of inertia and configures it by moving the inertia disk via the control panel. In the control room, the test system is then initiated; once testing is complete, the system automatically generates test curves and a detailed test report. After conducting five tests, technicians analyze the valid data and prepare the final report. On July 23, the comprehensive performance testing system for crane safety brakes—developed by the technical team at the National Bridge Gantry Crane Quality Inspection Center (referred to as "National Crane Center" hereafter)—left a strong impression during a dynamic braking torque test on an SB400 hydraulic clamp-disc brake model conducted for a specific company.

2020-02-13

Which hydraulic oil is suitable for use in lifting machinery?

Which hydraulic oil is suitable for use in lifting machinery?

Good antioxidant and hydrolytic stability: The ideal operating temperature range for most hydraulic oils is between 30°C and 80°C, as the lifespan of hydraulic oil is closely tied to its working temperature. Once the oil temperature exceeds 60°C, for every additional 8°C increase, the oil’s service life is halved. This means that at 90°C, the oil’s lifespan drops to roughly 10% of what it is at 60°C—primarily due to oxidation. At atmospheric pressure, every liter of oil contains slightly less than 0.1 liter of air. In fact, oxygen is always present, reacting with the hydrocarbons in the oil and gradually causing it to oxidize. Over time, this leads to a darkening of the oil’s color and an increase in its viscosity. Eventually, the oxidation products can no longer remain dissolved within the oil.

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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