Sharpening is an indispensable preparation procedure before drawing die. According to the introduction, the rotary forging machine has been used in the coarse wire rolling abroad. It is also useful for electric rolling, that is, the two ends of the wire are clamped with electric pliers, and then the wire is stretched into a point and broken. At present, all the domestic use of rolling rod tip, mainly the reciprocating rotary old rolling machine and eccentric rolling machine cycle rotation. Another lever manual reciprocating small tip rolling machine, specially for 1 mm below the use of fine steel wire.
Fold and edit the structure of this section sharpening machine
The reciprocating rotary tip rolling machine is used for decades of old equipment, simple structure, suitable for small factories and production of low carbon steel wire.
This equipment is composed of three parts: transmission, frame and rolling stick. It is reduced by belt wheel and gear, and the big gear rotates about 60 times per minute. A short eccentric shaft is attached to the side of the big gear, which makes the rolling stick rotate around 50° through the arm and connecting rod. If the position of the arm and the connecting rod is changed, the Angle of the rolling rod can be changed.
This old fashioned bar is 100~120 mm in diameter and has 8~16 slots. According to the diameter of the wire, slot from large to small in order. Slot compression rate is: coarse steel wire about 20%, medium and fine specification about 15%. The slot is concentric and symmetrical with the outer circle.
The working principle of the sharpening machine is shown in the figure below.
sharpening machine,bar pointing machine,sharpening machinery,tip rolling machine Jiangyin Wanyi Machinery CO.,Ltd , https://www.wydrawmachine.com
The Dalian LNG Project is the first LNG project that was formally started and constructed by PetroChina. In accordance with the requirements of the group leaders, the Dalian LNG project was built to become a “strategic project, high-quality project, green project, and demonstration projectâ€. The advanced project management model of “employer + PMC + EPC†was adopted. The project is built by PetroChina Dalian Liquefied Natural Gas Co., Ltd., and Ryukyu Engineering Co., Ltd. is the general contractor, which realizes independent design, autonomous procurement, independent construction and self-management. Since the official start of construction on April 18, 2008, all builders have been strictly managing, standardizing operations, meticulously organizing, and meticulously constructing, earnestly implementing each procedure, and proceeding in an orderly manner as planned. It takes only six months from pouring the pot to the top of the rise to create a new record in the history of LNG construction in China. The successful completion of this tank lift is a major breakthrough made by China's self-constructed LNG project, which indicates that China's large-scale LNG storage tank lifting technology has reached the international advanced level, and has accumulated successful experience for China's independent construction of LNG projects.
The Dalian LNG storage tank has a diameter of 84 meters and a height of 51 meters. Each tank can effectively store 160,000 cubic meters of liquefied natural gas at an ultra-low temperature of minus 162 degrees Celsius. Lifting the top of the tank using micro-pressure air buoyancy technology, using a high-power blower to send compressed air into the tank, lifting the pre-fabricated 695-ton arched steel tank top to rise to 36.5 meters along the inner wall of the concrete outer tank. The upper part engages with the outer can pressure ring.
In China, the previous LNG tank top-lift operations were led by foreign companies responsible for the preparation of the top-lift plan and implementation. The Dalian LNG project LNG storage tank is the first project in China to independently formulate a roof-lifting plan and organize implementation. In order to ensure the success of one-time lift, the owner carefully organized relevant experts and participating units to conduct multiple arguments and assessments on the top plan, risk identification, and emergency plan prepared by the general contractor, so as to fully prepare for the first success.
According to foreign experts, the lifting of LNG storage tanks is a key and difficult point in the construction of LNG projects. Its main focus is to grasp the balance in the process of raising the ceiling. Among them, the ascending velocity of steel can tops and the air-lift force are very important in the process of lifting. Only scientific and effective solutions to the coordination and cooperation among the three systems of storage tank sealing, air blowing and balance are available. To ensure that the ceiling is safe. The process of lifting the Dalian LNG storage tank progressed smoothly with a steady increase. The actual tilt error of the tank was less than 70 mm, and the maximum lift speed reached 360 mm per minute. This was the first time that the Chinese people had independently completed the large-scale LNG tank top lift.
PetroChina Dalian LNG Tank Top Lift Operation Completed
On September 27, the lifting of the LNG storage tanks of the Dalian LNG Project of PetroChina was successfully completed. This indicates that the first large-scale LNG project storage tank construction, “independent design, independent procurement, independent construction, and self-managementâ€, has successfully reached the first key control point as planned, presenting a gift for the 60th anniversary of the new China. The Dalian LNG project will lay a solid foundation for completion and production in 2011.