The Shantui extended track bulldozer is a modification of the standard model, featuring advanced performance, high reliability, low fuel consumption and convenient maintenance. The machine has an extended track, increasing the overall length of track on the ground and thereby reducing ground pressure. With excellent maneuverability, the extended track bulldozer is well adapted to the earth moving operations on soft ground. Long Track Type Dozers,Yoke Type Track Roller Dozers,Shantui Mini Bulldozer,Big Track Dozers Shandong Shantui Construction Machinery Import & Export Co.,Ltd. , https://www.bulldozers.pl
Shantui extended track bulldozer adopts extended bogie, featuring advanced and reasonable structure, flexible operations of working device, and easy maintenances and repairs, and is suitable for more severe working environments.
Shantui bulldozers are often used in road building, construction, mining, forestry, land clearing, infrastructure development, and any other projects requiring highly mobile, powerful, and stable earth-moving equipment. Shantui hydraulic drive series bulldozer features high technologic content, advanced and reasonable design, strong power, high productivity, and easy maintenances and repairs and can adapt to severe working conditions.
Pneumatic valve fault check and maintenance matters
Pneumatic control valve to control simple, fast response, and intrinsically safe, without the need to take another explosion-proof measures, has been widely used in various industries petroleum, chemical, power, metallurgy and other industrial enterprises widely used. We have to value its life, how to make it longevity? Then daily inspection and maintenance is essential. Take a look at the new European regulation valve manufacturers to introduce pneumatic control valve inspection and maintenance work. Pneumatic valve with graphite asbestos filler, about three months should be added to the filler on a lubricant to ensure that the pneumatic control valve flexible and easy to use. Found that packing under pressure is very low pressure, you should add filler, PTFE packing found hardening should be promptly replaced; should pay attention to the operation of the pneumatic control valve in the tour inspection, check the valve position indicator and adjust The output of the device is consistent; the positioner pneumatic control valve should always check the gas source and found that problems in a timely manner; should always maintain the health of the pneumatic valve and the various components of a complete and easy to use. Pneumatic valve failure and the reasons for the common reasons: (A) Pneumatic valve does not operate the fault phenomenon and the reasons are as follows: 1. No signal, no air source. ①gas source is not open, ② due to gas source water in the winter icing, resulting in duct blockage or filter, pressure regulator plug failure, ③ compressor failure; ④ gas mains leakage. 2. A gas source, no signal. ①regulator failure, ② signal tube leakage; ③ bellows leak locator; ④ regulate the omentum damage. 3. Locator airless. ①filter blockage; ② valve failure I ③ pipeline leakage or blockage. 4. Locator gas source, no output. The throttle of the positioner is blocked. 5. A signal, no action. ①spool off, ② valve core and the community or with the seat stuck; ③ stem bent or broken; ④ seat valve core block or block of dirt; ⑤ actuator spring rust due to long-term useless. (B) Pneumatic control valve instability phenomenon and the reasons are as follows: 1. Gas pressure instability. ①compressor capacity is too small; ② valve failure. 2. Signal pressure is not stable. ①The time constant of the control system (T = RC) is not appropriate; ② The regulator output is not stable. 3. Gas pressure stability, signal pressure is stable, but the action of the pneumatic control valve is still unstable. ①locator amplifier ball valve dirt worn lax, especially when the air consumption will produce output shock; ② locator amplifier nozzle baffle is not parallel, the baffle cover nozzle; ③ output tube , Line air leakage; ④ actuator stiffness is too small; ⑤ stem friction in the movement of large, with the contact parts of the block phenomenon. (C) pneumatic control valve vibration failure phenomenon and the reasons are as follows: 1. Pneumatic control valve at any opening vibration. ①unsteady support; ② nearby vibration source; ③ valve core and bush wear serious. 2. Pneumatic control valve near the fully closed position vibration. ①pneumatic control valve selected, often used in a small opening; ② single-seat valve medium flow direction and closed in the opposite direction. (D) Pneumatic valve slow and slow movement of the phenomenon and the reasons are as follows: 1. Stem only in unilateral action slow. ①Pneumatic diaphragm actuator diaphragm rupture leakage; ② "O" -type seal leakage in the actuator. 2. Stem in the reciprocating action are slow phenomenon. ①blockage of viscous substances in the valve body; ② polytetrafluoroethylene filler hardening or graphite asbestos filler lubricant drying; ③ packing plus too tight, frictional resistance increases; ④ stem because the valve does not lead to direct friction resistance; ⑤ no Pneumatic positioner pneumatic control valve can also lead to slow action. (E) Leakage of pneumatic control valve to increase leakage as follows: 1. Leakage when the valve is closed. ①spool is worn, serious leakage, ② valve not adjusted off is not strict. 2. Valve can not reach the fully closed position. ①medium pressure is too large, the actuator rigidity is small, the valve is not strict; ② valve foreign body; ③ bushing sintering. (F) smaller adjustable flow rate The main reason is smaller spool corrosion, so that adjustable minimum flow becomes larger.