In recent years, driven by environmental protection concepts, electric loaders have emerged as a new type of construction machinery and are gradually gaining widespread attention in the market. Compared to traditional fuel-powered loaders, electric loaders quickly become popular in modern engineerin

Before using a new airport tow tractor1.Please pay attention to the following points to ensure the efficient operation and longer service life of the airport tow tractor.Please refer to the manual for the use and maintenance of the engine.2.Fill the tank with all kinds of oil according to the requirements, fill all lubrication parts with enough engine oil, gear oil and grease according to the regulations (see the lubrication chart).3.Check the level of cooling water, the battery electrolyte and tire pressure according to the regulations.4.Check the bolt and nut of the whole airport tow tractor.5.Start engine, then check and eliminate the leakage of oil and water. Run-in period of a new airport tow tractorThe new car should be running in at least for 60 hours according to the following regulations.

TDER Lesson: How to maintain a forkliftDaily maintenance1.To clean the dirt and soil on the forklift, the key parts are: fork rack and gantry slide, generator and starter, battery electrode column, water tank, air filter.2.Check the tightening of various parts, focusing on: fork support, lifting chain tightening screws, wheel screws, wheel fixing pins, brakes, steering screws.3.Check the reliability and flexibility of the steering gear.4.Check the leakage, focusing on: each pipe joint, diesel tank, oil tank, brake pump, lifting cylinder, tilt, cylinder, water tank, water pump, engine oil pan, torque converter, transmission, transaxle, main reducer, hydraulic steering gear, steering cylinder.5.Tire pressure check: insufficient should be added to the specified value to confirm that there is no air leakage. Check whether the tire ground and side are damaged, and whether the axle is deformed.6.Brake fluid, water check: check whether the brake fluid is within the scale range, and check whether the brake pipe is mixed with air.When adding brake fluid, prevent dust and water from mixing. When adding water to the tank, use clean tap water, if using antifreeze, the same antifreeze should be added. When the water temperature is higher than 70C, do not open the tank cover. When opening the cover, pad a thin cloth and twist the tank cover without gloves.7.Engine oil, hydraulic oil, electrolyte check: first pull out the oil scale, wipe the ruler head, insert it and then pull out to check whether the oil level is between the two scale lines. The oil level in the working tank should be between two calibration lines; Too little oil will mix air into the pipeline, and too much will overflow from the cover plate. Battery point solution liquid should also be between the upper and lower scale lines, insufficient to add distilled water to the top line.8.Brake pedal check: step on each pedal to check whether there is abnormal sluggishness or blockage.9.Belt, horn, light, instrument and other inspection: check whether the tightness of the belt meets the regulations. No adjustment allowance or damage cracks, need to be replaced; Horn, light, instrument should be normal and effective.10.Remove oil filter sediment. Level 1 technical maintenanceFollow the "Routine maintenance" project and add the following work.1.Check the cylinder pressure or vacuum degree.2.Check and adjust the valve clearance.3.Check whether the thermostat works normally4.Check whether the multi-way reversing valve, lifting cylinder, tilt cylinder, steering cylinder and gear pump work normally.5.Check whether the shift work of the transmission is normal6.Check and adjust the gap between the brake disc and the brake drum of the foot brake.7.Replace the oil in the oil pan, check whether the crankcase ventilation nozzle is intact, and clean the oil filter and diesel filter element.8.Check whether the engine and starter are firmly installed, and whether the connector is clean and firm, check whether the carbon brush and commutator are worn.9.Check the tightness of fan belt.10.Check whether the wheel installation is firm, whether the tire pressure meets the requirements, and remove the debris embedded in the table.11.Due to maintenance work and disassemble parts, when reassembly to carry out forklift road test.(1) Braking performance under different degrees should be free from deviation and snaking. On steep slopes, when the hand brake is tightened, it can stop reliably.(2) Listen to the engine in acceleration, deceleration, heavy load or no-load operation, there is no normal sound.(3) After a road test, check the brake, transmission, front axle housing, gear pump for overheating.(4) The fork will lift speed is normal, there is no shaking.12.Check whether the diesel tank oil inlet filter is blocked and damaged, and clean or replace the filter. Level 2 technical maintenanceIn addition to the maintenance of the items according to Level I technology, the following work has been added:1.Clean the oil tank, filter and pipeline, and check whether there is corrosion, crack, do not use fiber yarn head, cloth wipe after cleaning.2.Clean the torque converter, gearbox, check the wear of parts, and replace the new oil.3.Check the drive shaft bearing and change the direction of the universal joint cross shaft if necessary.4.Check the tightness of all parts of the drive axle and whether there is oil leakage, dredge the porosity. Remove and check the main reducer, adjust the bearing axial clearance, add or replace lubricating oil.5.Disassemble, adjust and lubricate the front and rear wheels, and carry out half-shaft transposition.6.Clean the brake and adjust the friction gap.7.Clean the steering gear and check the free turning momentum of the steering disc.8.Disassemble and clean the gear oil pump, pay attention to check the wear of the gear, housing and bearing.9.Disassemble the multi-way valve, check the gap between the valve stem and the valve body, and do not disassemble the safety valve if necessary.10.Check whether the steering joint is damaged and cracked, the coordination between the steering bridge kingpin and the steering joint, and remove the wear of the longitudinal and horizontal tie rod and the joints of the steering arm.11.Remove the tires, brush and paint the rims, check the inner and outer tires and cushion belts, change positions and inflate according to regulations.

1. Be careful not to get too close to the edge of the cliff. When building a levee, filling or unloading materials down a cliff, one pile should be unloaded first, and the latter pile should be used to push the previous pile.2. When the machine pushes the soil down the cliff or to the top of the slo

First, excavator prohibited operation1. It is prohibited to operate excavators in crowded places to avoid personnel injury due to improper operation.2. It is prohibited to operate excavators in dangerous areas such as driving, pedestrians and high voltage wires to avoid accidents.3. It is prohibited to pile debris on the front of the excavator, so as not to affect the vision and work effect.4. Overload operation is prohibited to avoid damage to the machine and parts, resulting in unnecessary maintenance costs.5. It is prohibited to carry out digging operations in places such as unstable ground, large slope or vertical slope, so as to avoid rollover accidents.Second, the operation of excavators need to pay attention to1. Before operation, we should carefully check whether all parts of the excavator are in good condition, and carry out necessary maintenance and maintenance to ensure that the machine is in good condition.2. In the process of operation, you should always pay attention to the surrounding environment and conditions, and take timely safety protection measures to ensure the safety of operation.3. During operation, the machine should be kept stable to prevent instantaneous pressure waves caused by excessive operation or sudden turning, causing fatigue and aging of parts.4. After the end of the operation, the machine should be cleaned and organized to extend the service life of the machine.To sum up, the excavator is a very important mechanical equipment, and it must be very careful in the operation process. Compliance with the above prohibited operations and precautions can ensure the safe use of excavators and reduce unnecessary losses.

Truck Mounted Crane is a common lifting equipment, widely used in construction sites, logistics warehousing, ports and other fieldsIn the view. It realizes the object by suspending it at the end of the boom, using the power of the hydraulic or electric systemOperations such as lifting, moving and positioning. The following will be from the structural composition, hydraulic system, power system and working originalThe working principle of truck crane is introduced in detail.1. Structure compositionThe truck mounted crane is mainly composed of chassis, hydraulic system, boom and operation room.(1) Chassis: Chassis is the main load-bearing part of the truck crane, usually by the special lifting car chassis and caterpillar bottomDisc in two forms. The chassis of the special lifting vehicle is usually composed of the cab, engine, drive system and chassis structureMake up.(2) Hydraulic system: The hydraulic system is the power source of the truck mounted crane, which converts hydraulic oil into hydraulic energy through the hydraulic pump, and realizes the movement of the boom up and down, expansion and rotation through the hydraulic cylinder, hydraulic motor and other executive components. The hydraulic system also includes control valve group, hydraulic pipeline, hydraulic oil tank, etc.(3) Lifting arm: The lifting arm is the main working part of the truck mounted crane, which is used to suspend objects and achieve lifting, turning and stretchingShrink and other functions. The lifting arm is generally composed of a telescopic arm, a rotating mechanism, a lifting arm and a suspension device. The length of the boomThe degree and structure form are determined according to the actual work needs and tonnage requirements.(4) Operation room: The operation room is generally located at the top of the cab or on the side of the lifting arm, and the operator can pass the controllerOperate the lifting, expansion, rotation and other actions of the crane.2. Hydraulic systemThe hydraulic system is the core part of the crane, which sucks the hydraulic oil from the tank through the hydraulic pumpThe control valve group controls the hydraulic flow, and then the hydraulic energy is converted into the machine by the actuator such as the hydraulic cylinder and the hydraulic motorMech can thus achieve a variety of actions.Hydraulic pumps are mainly gear pumps, vane pumps and plunger pumps and other types. Gear pump simple structure, small volume, suitableSmall crane used. The flow of vane pump is stable, the pressure fluctuation is small, suitable for small and medium-sized cranes. Plunger pumpHigh pressure, large flow, suitable for large cranes.The control valve group is mainly composed of balance valve, relief valve, speed regulating valve, reversing valve and safety valve. Balance valve forBalance the pressure and flow of the hydraulic system to ensure the stable operation of the hydraulic system. The relief valve controls the hydraulic systemThe maximum working pressure of the system, when the pressure exceeds the set value, it will automatically relieve the pressure protection system. Speed regulating valve for controlMake the movement speed of the hydraulic cylinder, and realize the speed adjustment of lifting, expansion and rotation. Directional valves are used to control hydraulic pressureThe flow of oil in and out, to achieve the boom up and down and telescopic movement. Safety valves are used to prevent hydraulic system overload andA fault occurs.The hydraulic cylinder is the actuator of the hydraulic system, which realizes the up and down of the boom through the pressure and flow of the hydraulic oil.Movements such as expansion and rotation. A hydraulic motor, similar to a hydraulic cylinder, is an execution that converts hydraulic energy into rotary motionElement for realizing the rotating motion of the boom.3. The power systemThe electric power system of the crane is mainly composed of starter motor, generator and control device. The starter motor is used for startingDynamo, which converts mechanical energy into electrical energy to provide power for hydraulic systems and auxiliary equipment. ControlsThe device is used to control the operation of the power system, including power switches, control buttons, meters and protection devices.4. The working principleThe working principle of the crane can be simply summarized as follows: the power provided by the hydraulic system drives the lifting of the boom,Movement such as expansion and rotation to complete the suspension, lifting, moving and positioning of the object.The specific operation process is as follows:(1) The operator enters the corresponding command through the button on the operating platform.(2) The hydraulic pump draws the hydraulic oil from the oil tank and enters the hydraulic cylinder or hydraulic horse after adjustment by the control valve groupReach.(3) The hydraulic cylinder or hydraulic motor realizes the up and down, expansion and rotation of the boom according to the pressure and flow of the hydraulic oilAnd other sports.(4) Suspend the object at the end of the lifting arm by means of a sling or fixture.(5) The control valve group of the hydraulic system adjusts the movement of the hydraulic cylinder or hydraulic motor according to the instructions input by the operatorSpeed and direction, to achieve the object lifting, moving and positioning operations.(6) When all the work is completed, the operator controls the hydraulic pump through the button to stop working, and the crane stops working.To sum up, the crane realizes the movement of the crane arm through the power provided by the hydraulic system, so as to achieve the objectOperations such as lifting, moving and positioning. It has the advantages of simple structure, convenient operation and high efficiency in modern timesIt has important application value in the field of lifting and transportation.