What are the mechanical engineering? Contains what, a lot of people may not know nor understand, then and now, Penglai loader for us to introduce: digging machinery such as single bucket digging machine (can be divided for crawler type digging machine and wheel type digging machine), multi bucket digging machine (can be divided for bucket wheel type digging machine and chain bucket type digging machine), multi bucket trencher (also can be divided into bucket wheel trencher and chain bucket trencher), tumbling digging machine, milling digging machine, tunnel boring machine (including shield ditch machinery). II of earthmoving machines such as bulldozer (also can be divided into rubber tyred bulldozers and crawler bulldozer, scraper can be divided for crawler self-propelled scrapers, tire scraper and towed scraper), loader, can divide again for wheel type loader and crawler loaders, graders (can be divided into self-propelled grader and towed grader), transport vehicle (also can be divided for uniaxial transport vehicle and biaxial traction transport vehicle), flatbed truck and dump trucks. The hoisting machinery such as tower crane, self-propelled crane, derrick crane, grab crane etc.. The compaction machinery such as tire road roller, smooth wheel roller, single foot pressure roller, vibratory road roller, ramming machine, tamping machine. The piling machinery such as drilling machine, diesel hammer, vibrating machine, piling machine etc.. The reinforced concrete machinery such as concrete mixer, concrete mixing station, concrete mixing building, concrete conveying pump, concrete mixing and transporting car, jet concrete, concrete vibrator, steel processing machinery and so on. The pavement machinery such as flat machine, ballast cleaning machine etc.. The rock drilling machinery such as drilling rig, pneumatic rock drill, electric drill, rock drill and DTH Drill etc.. To other engineering machinery. Such as erecting machine, pneumatic tools (pneumatic tools) etc.. The automatic drop of the boom is the shortcoming of the tire loader in the process of using. Loader often in the case of moving arm automatic whereabouts, will not only make the loader working power is low, the hydraulic oil temperature rise is too high, the service life is reduced, but also constitute loader engine fuel consumption increase. Shaanxi loader sold to clarify a arm automatically whereabouts reason: under normal circumstances, when the boom cylinder piston rod stretched to the limit range, boom cylinder no action, hydraulic oil by tightening, the hydraulic system pressure continued to rise. When the hydraulic system pressure arrived at the loader working equipment pressure set value (that is, the main safety valve calibration value), the main safety valve open, from the gear pump output of high pressure oil, from the main safety valve to the hydraulic tank pressure relief. According to the theory, analysis of moving arm automatically whereabouts reason has the following four: (1) the hydraulic hose leak assumption that hydraulic pipe joint seal ring damage, crimping is not real, or tube body damage, moving arm cylinder pressure cavity of the hydraulic oil will be from the damaged, the gap jet hydraulic oil, thus resulting in boom automatically whereabouts. (2) dynamic arm valve spool disadvantages movable arm valve spool can not back, spool serious wear and tear, Mifengbuyan will form a moving arm cylinder pressure cavity of the hydraulic oil flows back to the hydraulic oil tank, causing the boom automatically whereabouts. (3) the main safety valve shortcomings when the main pressure of the hydraulic system to exceed the set value, the hydraulic system of the main oil supply pipeline hydraulic oil, the main safety valve pressure relief. Assuming the main safety valve stuck or damaged, will constitute the hydraulic system in this abnormal pressure relief, and then the automatic whereabouts of the boom. (4) boom cylinder leakage faults in the boom cylinder piston rod rapid movement in the process, moving arm cylinder in the air due to by the sharp tightening and produce instant moment high temperature and high pressure. If the attack of high temperature, high pressure cylinder sealing ring to bear the limit, will cause the sealing ring failure. After the failure of the piston seal ring of the movable arm cylinder, the hydraulic oil in the non rod cavity will leak into the rod cavity, and then the movable arm will automatically drop.

1 view and ensure that all the lights of the Shandong loader lighting and the display of lights can be normal. In particular, to view the normal appearance of the steering lamp and brake light. 2 check and ensure that the Shandong loader in the launch of the launch machine, no one in the car or near the loader local work, to ensure that the accident will not endanger themselves or other people's safety. 3 former Shandong launched transmission operating handle loader should pull in the neutral position. 4 without an emergency brake system, the hand brake handle plate should be put into the parking position. 5 can only be in a good place to launch or work in the air activities of the Shandong loader. As in the indoor work, to the exhaust port of the launch machine or toward the outdoor Shandong loader mainly by the engine, hydraulic system, working equipment, running equipment and electrical control and other parts of the structure. Hydraulic system is composed of hydraulic pump, control valve, hydraulic cylinder, hydraulic motor, pipeline, oil tank and so on. Electrical control system includes monitoring disk, the launch of the control system, pump control system, all kinds of sensors, solenoid valves, etc.. Shandong loader usually consists of three most of the working equipment, reversing equipment and running equipment. According to its structure and use can be divided into: track type, tire type, walking type, full hydraulic, half hydraulic, full inversion, non full inversion, general type, special type, articulated, elastic arm type and other types. Work equipment is a direct end to explore the mission of the equipment. The boom arm and bucket hinged three parts and. The landing boom, bucket and bucket roll elastic rod with reciprocating double hydraulic cylinder control effect. To used a variety of different construction work demand, Shandong loader can be equipped with a variety of equipment, such as