Glorysteelwork

Welding Process of Overhead Crane Rail Joint In order to make the overhead crane rail transport more stable, rail splints will not be used for the overhead crane rail joint connection, but welded joint connection will be used. The main key to the welded joint is to solve the bending deformation and weld cracking of the overhead crane rail joint. During the welding process of the overhead crane rail joint, the overhead crane rail joint is deformed downwardly, so the overhead crane rail end must be padded to a certain height before welding to ensure that the rail joint can be kept straight after the welding is completed. The height of the rail end pad is determined by factors such as the type of rail, length, fixing method and ambient temperature. The rails are fixed to the crane beam by means of hook bolts, and each joint is provided with four fixed points. After the bottom of the rail is welded, reduce the height to 20mm, and then tighten the hook bolts to continue welding. When the o...

Welding Technology of QU120 Crane Rail The material of the QU120 crane rail is U71Mn. It can be seen from the chemical composition that U71Mn is a kind of high carbon steel with high carbon, phosphorus and sulfur contents, insufficient weldability and high crack sensitivity. It must be preheated with arc welding. In order to avoid martensite in the heat affected zone of the weld and ensure the quality of the final rail weld, preheating should be carried out at 350 °C – 400 °C during welding. QU120 crane rail joint should be hoisted in place and a piece of 8mmx50mmx200mm steel plate should be placed directly under the interface. The corner of the interface section is polished with a sander. The alignment tolerance of the top and side faces is ≤0.5mm, and it’s better to make the reserved gap of the butt joint kept at 15mm-20mm. Since the base material of QU120 crane rail has high carbon content, large rigidity, and large thickness, it is necessary to select an alkaline low-hydrogen ele...

Selection and Inspection of 40×60 Flat Crane Rail The crane rail includes special rails, railway rails as square rails, like 40×60 flat crane rail and P-rails. Most of the crane carts and trolleys now use P-type rails. The track inspection trolley is mainly composed of a driving unit and can quickly advance and retreat and slowly advance and retreat in the track to adapt to different measurement requirements. The adjustment buttons on both sides of the cart can be used to allow it to operate safely on 40×60 flat crane rail in the range of 69 mm to 129 mm. The control unit belongs to the center of the detection trolley, which is capable of receiving signals from the ground operator, supervising and controlling the movement of the trolley, and being able to discern whether the speed is slowed down, as well as the damage mark and the stop motion, depending on the operation. The track inspection trolley can reach a maximum of 0.55 meters per second. However, in order to ensure the accurac...

Study on the Influence of 40×60 Crane Rail Plate Stress The main operation mode of the overhead crane is the orbital operation, that is, the wheel supports the whole crane and transmits the gravity to the lower 40×60 crane rail , and the 40×60 crane rail receives the concentrated pressure from the crane wheel and guides the wheel to run. Therefore, the track device is the direct load-bearing structure of the crane device. Usually, special rails that meet the requirements of the wheels are used as crane rails. These rails are fixed with the pressure plate and the structure of the plant. If the crane runs at a slow speed, the operating frequency is not high, and the wheel pressure is not large, this solution can still meet the requirements. However, if the crane is in a high-speed, frequent or large-wheel working environment, the existing fixing method cannot meet the performance requirements. At this time, the phenomenon that the rail press plate bolt is broken is extremely likely to ...

US Steel Industry Environment Deteriorated Further The US steel industry is facing a new round of crisis, the terminal market is weak, and ST52 steel flat bar prices are falling, which further leads to the decline of ST52 steel flat bar companies. As the United States tried to raise trade tariffs in 2018, it hit the global free economic market, and international relations began to deteriorate. The trade war finally came back from the counterattacks of other countries, which seriously hindered the healthy development of the global market. Last week, US Steel Company plunged about $13 to $10.78, down about 60% from a year ago. The company announced its latest third-quarter earnings, which was much lower than expected, which led to a sharp fall in stock prices. The company said that due to the impact of falling steel prices, the second half of the flat rolling income has a negative impact, it is expected that the two blast furnaces will remain idle. In the third-quarter earnings report o...