When people talk about the Grand Canal, people will always think of the “Beijing-Hangzhou Grand Canal†that is still partially open to navigation. However, they do not know that there is another “Grand Canal†in the history and loess. The Grand Canal of the Sui and Tang Dynasties (middle and lower reaches of the river) was originally called the Tongji Canal. Song was often referred to as the Dianqu Canal and Luohe River. Since its reign of Siheung, Tang and Song Dynasties, after the Southern Song Dynasty gradually declined, once the glory has gradually been forgotten by people, and even their descendants of the specific flow path is also ambiguous. What is left to the world more is to find chapters in the poetry of the Tang poetry and pay tribute to ancient times. Fortunately, in recent years, many important archaeological work have been carried out in various places so that we can see the grandeur of the Tang Grand Canal. Pro, want to know more treasures of the mystery, want to know more of the treasure of people, want to share treasure exploration experience with the treasurer? Pay attention to gold exploration Internet now!   Â
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.
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