Rotary crusher

Crushing equipment is the mechanical equipment used to crush minerals
crushing operations are usually divided into coarse crushing, medium crushing and fine crushing according to the size of feeding and discharging particles. The commonly used sand and stone equipment include jaw crusher, impact crusher, impact crusher, compound crusher, single stage hammer crusher, vertical crusher, rotary crusher, cone crusher, roller crusher, double roller crusher, two in one crusher, one-time molding crusher, etc
it can be divided into six categories according to crushing mode and mechanical structure characteristics (action principle)
(1) jaw crusher (tiger mouth). The crushing action is that the movable jaw plate periodically presses the fixed jaw plate to crush the ore block sandwiched in it< (2) cone crusher. The ore block is between the inner and outer cones, the outer cone is fixed, and the inner cone swings eccentrically to crush or break the ore block
(3) roller crusher. In the gap between two opposite rotating round rollers, the ore block is mainly crushed continuously, but it also has the function of grinding and stripping, and the toothed roller surface also has the function of splitting
(4) impact crusher. The ore block is broken by the impact of fast rotating moving parts. Belong to this category can be divided into: hammer crusher; Cage crusher; Impact crusher
(5) grinding machine. The ore is crushed by the impact and grinding of grinding medium (steel ball, steel bar, gravel or ore block) in the rotating cylinder
(6) other types of crushers and grinders. Drilling machinery is divided into rock drill and drilling rig, and drilling rig is divided into open-pit drilling rig and underground drilling rig
① rock drill: it is used to drill blastholes with a diameter of 20-100 mm and a depth of less than 20 m in medium hard rock. According to its power, it can be divided into pneumatic, internal combustion, hydraulic and electric rock drills, among which pneumatic rock drill is the most widely used
② surface drilling rig: according to the working mechanism of crushing ore and rock, it can be divided into wire rope percussion drilling rig, down the hole drilling rig, cone drilling rig and rotary drilling rig. Because of the low efficiency, the wire rope percussion drill has been graally replaced by other drills
③ downhole drilling machine: when drilling borehole with diameter less than 150 mm, in addition to rock drill, 80-150 mm small diameter down the hole drill can also be used. Using the axial pressure and rotary force of the cutter to roll the rock surface, it is a mechanical equipment for directly crushing ore and rock. The cutter used includes disc hob, wedge hob, ball hob and milling cutter. According to the different driving roadway, it is divided into raise boring machine, shaft boring machine and drift boring machine
① raise boring machine is specially used for drilling raise and pass. Generally, it doesn't need to enter the raise for operation. The guide hole is drilled with a cone bit, and the hole is enlarged upward with a reamer composed of disc hobs
② the vertical drilling rig is specially used for drilling a well at one time, which is composed of drilling tool system, rotary device, derrick, drilling tool lifting system and mud circulation system
③ drift digger is a comprehensive mechanized equipment which combines mechanical rock breaking and slag removal and continuously dries. It is mainly used for tunneling in coal roadway, engineering tunnel in soft mine and middle drift with medium hardness and above
the special dryer for slime is a new type of special drying equipment developed on the basis of drum dryer, which can be widely used in the drying of slime, raw coal, flotation clean coal, mixed clean coal and other materials in coal instry
2. Drying of blast furnace slag, clay, bentonite, limestone, sand, quartzite and other materials in construction instry
3. Drying of various metal concentrates, waste resie, tailings and other materials in mineral processing instry
4. Drying of non heat sensitive materials in chemical instry

In 1936, among the mixed praise of the new deal in China, the presidential election once every four years came again. Roosevelt won again, winning all the electoral votes except Maine and Vermont. Roosevelt became the first president to control both houses of Congress by his party for two consecutive terms since President Monroe

The publication of Monroe declaration originated from the independence movement of Spanish colonies in America. Latin American countries began the independence movement at the time of the uprising in Spain and achieved a major victory. The United States took the lead in recognizing the independence of Latin American countries in the world. Faced with the threat of intervention from the holy alliance, British Foreign Secretary canning proposed to the United States that the two countries issue a joint statement opposing the restoration of colonization in Latin America and advocating the recognition of Latin American independence. After a heated debate, American foreign policy makers decided to put aside canning's proposal and interpret the American position independently. On December 2, 1823, Monroe, the then president of the United States, issued his state of the Union address, which is the origin of Monroe Doctrine
the geographical scope of Monroe Doctrine is in Latin America. The major powers involved are Spain, Britain, Russia and France. Spain is the suzerain of the newly independent countries in Latin America and strongly advocates the suppression of the Latin American independence movement; Russia is the leader of the holy alliance. It owns Alaska in America and tries to expand to China and the United States; France has close economic relations with Latin America and actively advocates interfering in Latin American affairs; Britain was the most powerful country at that time and the largest trading partner of the newly independent countries in Latin America. Although Britain was willing to see the independence of the Spanish colonies in Latin America, it had mutual suspicion with the United States and tried to curb the expansion of American power. It can be said that the United States is facing a dangerous international environment
the Monroe declaration was published in the 47th year after the independence of the United States. As far as the comprehensive national strength is concerned, the United States ring the Monroe period is not a strong country, even a weak country compared with these powers. Economically, the manufacturing instry in the United States is only about 1 / 5 of that in the United Kingdom, less than half of that in Russia and France, and also lower than that in Spain, accounting for about 2% of the world's total manufacturing output. The Monroe era is a naked era of power politics. Today, some widely accepted norms and norms of international law, such as limiting the right to war, are far from being accepted. The most important means for countries to safeguard their national interests and strive for international status is war, and the most important tool is the army. During the Monroe period, the military strength of the United States was rather weak. In 1819, before the Monroe declaration was issued, the United States encountered economic crisis, and some plans to expand its military strength were postponed or cancelled. In 1821, the U.S. Congress reced the size of the army to 6183. Although the Navy passed the long-term construction plan in 1819, the expansion plan was delayed and compressed. In 1823, the strength of the U.S. Navy was only 1 / 4 of that of France and 1 / 8 of that of Russia, and the gap with Britain was even greater. Compared with the hundreds of thousands of troops of the relevant powers, it is almost negligible. The Holy Alliance threatened to suppress the Latin American independence movement. At that time, the international community only recognized Latin American independence by the United States. What kind of policy to adopt on the issue of Latin American independence will be an important test for the young United States