Forklifts refer to wheeled handling vehicles that handle the loading and unloading of palletized cargo, stacking, short-distance transport, and heavy-duty handling. When the hydraulic system is in operation, it will generate hydraulic energy conversion losses and hydraulic system energy transmission losses. Power and energy loss and other unfavorable factors make the working efficiency of the hydraulic system drop. Therefore, the hydraulic system of the forklift is improved. Creating new energy-saving control technologies is of particular importance.
1, energy loss
When the forklift is working, it is working while driving. The load changes frequently and the range of change is large. There are three energy conversions when the hydraulic system is working, including the hydraulic pump producing high pressure oil, converting the mechanical energy into pressure energy; the actuator and the hydraulic element convert the pressure energy of the oil into mechanical energy and heat. The entire energy conversion and transmission process is accompanied by energy loss. At the same time, the mismatch between the engine, the pump, the valve, and the load also generates a large energy loss.
2, power matching energy loss
The operating environment of the forklift is different from that of the operating object, and the power requirements for the engine are also different, the adjustment characteristics of the engine, and the characteristic curve of the engine. When the engine and the hydraulic pump work together, it can be seen from the engine speed regulation characteristics and universal characteristics that the position of each speed adjusting rod of the engine corresponds to the best energy-saving working point and maximum power point, and is used as the engine and the hydraulic pump and most The best match is to adjust the absorbed power of the hydraulic pump. Due to the variability of the workload of the forklift, the absorption power of the hydraulic pump changes, causing the engine speed to deviate from the optimal node.
3, hydraulic source energy conversion loss
When the forklift hydraulic system is working, there is a gap between the relative moving parts in the hydraulic pump body and the seal between the joint surfaces is not strict, which causes the hydraulic pump to leak and cause system power loss; the oil has a certain viscosity and flows through the pump body surface when there is a certain viscosity. Energy loss due to flow resistance; loss of energy due to cavitation under negative pressure conditions and volumetric compression under high pressure conditions; too high oil absorption resistance, large oil viscosity, and excessive pump speed during oil absorption The reason is that the oil cannot fully fill the sealed working chamber and the like causes a volume loss and the efficiency of the pump is reduced.
4, the hydraulic system energy transmission loss
Forklift truck hydraulic system usually consists of several pipelines in series, each of which is connected in series with devices that form local resistance such as elbows, control valves, filters, pipe joints, etc. When hydraulic oil flows through pipes, elbows, When the control valve and pipe joints and other edges and pressure loss and partial pressure loss; hydraulic cylinders and other operating elements due to the design and processing process is not reasonable, the friction pair contact area friction loss. These pressure and frictional losses change the fluid resistance and the amount of heat when the fluid flows, causing the oil temperature of the hydraulic system to be too high. According to relevant statistics, when the oil temperature of the hydraulic system of the forklift exceeds 85 degrees Celsius, the aluminum shell with a large expansion coefficient generates a secondary sweeping phenomenon, the hydraulic valve is easily jammed, the lifting speed of the lifting cylinder drops significantly, and the seal and the high pressure hose are reduced. Easy to age, the small holes and crevices of components are easy to plug.
I hope relevant people will see this article will improve the forklift hydraulic system.
Dimension
1/2" to 4"(DN15~DN100)
Range(Wall Thickness):
3000LB to 9000LB
XS, Sch80, Sch160, XXS.
Standard
ASME/ANSI B16.11
MSS SP-79, MSS SP-83, MSS SP-114
JIS B2316, JIS B2302 etc.
Material:
General Stainless steel, Super Stainless Steel, Duplex Stainless Steel (Ferritic-Austenitic Stainless Steel), Austenitic Stainless Steel, Martensitic Stainless Steel, Ferritic Stainless Steel. etc.
Material:
Carbon steel:
ASTM A105;
ASTM A266 GR.1,GR.2,GR.3,GR.4
Stainless steel:
304/SUS304/UNS S30400/1.4301
304L/UNS S30403/1.4306;
304H/UNS S30409/1.4948;
309S/UNS S30908/1.4833
309H/UNS S30909;
310S/UNS S31008/1.4845;
310H/UNS S31009;
316/UNS S31600/1.4401;
316Ti/UNS S31635/1.4571;
316H/UNS S31609/1.4436;
316L/UNS S31603/1.4404;
316LN/UNS S31653;
317/UNS S31700;
317L/UNS S31703/1.4438;
321/UNS S32100/1.4541;
321H/UNS S32109;
347/UNS S34700/1.4550;
347H/UNS S34709/1.4912;
348/UNS S34800;
Alloy steel:
ASTM A694 F42/F46/F48/F50/F52/F56/F60/F65/F70;
ASTM A182 F5a/F5/F9/F11/F12/F22/F91;
ASTM A350 LF1/LF2/LF3;
Duplex steel:
ASTM A182 F51/S31803/1.4462;
ASTM A182 F53/S2507/S32750/1.4401;
ASTM A182 F55/S32760/1.4501/Zeron 100;
2205/F60/S32205;
ASTM A182 F44/S31254/254SMO/1.4547;
17-4PH/S17400/1.4542/SUS630/AISI630;
F904L/NO8904/1.4539;
725LN/310MoLN/S31050/1.4466
253MA/S30815/1.4835;
Nickel alloy steel:
Alloy 200/Nickel 200/NO2200/2.4066/ASTM B366 WPN;
Alloy 201/Nickel 201/NO2201/2.4068/ASTM B366 WPNL;
Alloy 400/Monel 400/NO4400/NS111/2.4360/ASTM B366 WPNC;
Alloy K-500/Monel K-500/NO5500/2.475;
Alloy 600/Inconel 600/NO6600/NS333/2.4816;
Alloy 601/Inconel 601/NO6001/2.4851;
Alloy 625/Inconel 625/NO6625/NS336/2.4856;
Alloy 718/Inconel 718/NO7718/GH169/GH4169/2.4668;
Alloy 800/Incoloy 800/NO8800/1.4876;
Alloy 800H/Incoloy 800H/NO8810/1.4958;
Alloy 800HT/Incoloy 800HT/NO8811/1.4959;
Alloy 825/Incoloy 825/NO8825/2.4858/NS142;
Alloy 925/Incoloy 925/NO9925;
Hastelloy C/Alloy C/NO6003/2.4869/NS333;
Alloy C-276/Hastelloy C-276/N10276/2.4819;
Alloy C-4/Hastelloy C-4/NO6455/NS335/2.4610;
Alloy C-22/Hastelloy C-22/NO6022/2.4602;
Alloy C-2000/Hastelloy C-2000/NO6200/2.4675;
Alloy B/Hastelloy B/NS321/N10001;
Alloy B-2/Hastelloy B-2/N10665/NS322/2.4617;
Alloy B-3/Hastelloy B-3/N10675/2.4600;
Alloy X/Hastelloy X/NO6002/2.4665;
Alloy G-30/Hastelloy G-30/NO6030/2.4603;
Alloy X-750/Inconel X-750/NO7750/GH145/2.4669;
Alloy 20/Carpenter 20Cb3/NO8020/NS312/2.4660;
Alloy 31/NO8031/1.4562;
Alloy 901/NO9901/1.4898;
Incoloy 25-6Mo/NO8926/1.4529/Incoloy 926/Alloy 926;
Inconel 783/UNS R30783;
NAS 254NM/NO8367;
Monel 30C
Nimonic 80A/Nickel Alloy 80a/UNS N07080/NA20/2.4631/2.4952
Nimonic 263/NO7263
Nimonic 90/UNS NO7090;
Incoloy 907/GH907;
Nitronic 60/Alloy 218/UNS S21800
SALES@GHSAILINGPIPE.COM
SALES@GHSAILINGPIPE.COM
The boss, also known as the nozzle, is a disposable component of the automatic control instrument in the process piping, which is used to connect the supervisor and other components.
The single side double point welding of the convex platform has the following advantages: relatively low cost, multiple use of fixed equipment or robot welding; the surface deformation is slight, the quality is relatively stable; the welding efficiency is high, and the welding work of two welding can be completed at a time. The shortcoming is that there is a certain amount of grinding at the time.
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