The daily inspection of the lifter has the following points 1. The routine maintenance must be carried out by the operator every three months. If the user uses a higher frequency or is used in a worse environment, the user will shorten the maintenance time according to the specific circumstances. 2. During the daily operation, it is necessary to check the sensitivity and efficiency of the safety device, the leakage of the hydraulic system, the adequacy of the oil quantity, and the grease on the guide rail. 3, check whether the main and auxiliary hooks are sensitive and reliable. The daily inspection of the lifter has the following points 1. The routine maintenance must be carried out by the operator every three months. If the user uses a higher frequency or is used in a worse environment, the user will shorten the maintenance time according to the specific circumstances. 2. During the daily operation, it is necessary to check the sensitivity and efficiency of the safety device, the leakage of the hydraulic system, the adequacy of the oil quantity, and the grease on the guide rail. 3, check whether the main and auxiliary hooks are sensitive and reliable. 4, check whether the synchronous wire rope is loose. If it is loose, please tighten and fix it. 5, check the oil quantity in the tank and fill up the hydraulic oil. 6, cleaning the hydraulic system. 7, hydraulic oil routine is changed once a year (first use for three months to replace). When the hydraulic oil is replaced, the lifting machine is reduced to the lowest position, the hydraulic oil should not have any pressure (zero pressure), no load on the lifting machine, and the anti wear hydraulic oil of N46 is added. The treatment of waste oil must be carried out according to the local environmental protection regulations. 8, clean the oil stains and burrs on the rails of the column, check whether the wear of the slider is serious or not, and replace them in time. The replacement period of the main parts of the double column and Longmen lifting machine is 1. Hydraulic oil: the initial use is 3 months, and then it will be replaced every other year. (2) chain: 3 years or chain piece, chain pin damage signs. (3) chain pin cotter pin and chain end connector connection shaft when the nut is loose, make up in time. (4) the time limit for normal use of seals at tubing connections is two years. If damage occurs, replace them in time. (5) the oil cylinder seal is 2 years. (6) spring 2 years, insurance hook 3 years, pallet pad damage should be promptly filled. (7) sprocket and sprocket shaft, shaft sleeve for 3 years. (8) the slide block was used for 3 years. (9) synchronous wire rope breakage reaches 10 or more than 2 years, and must be replaced. The main reason for the squeal of double column lift is (1) the wear of the slide block is serious or the lubrication condition is poor. (2) because of abnormal use, the deformation of the lead screw causes the movement of the screw nut to vibrate. (3) the nut is badly worn. (4) what includes the upper and lower limit stroke switch, the safety nut, the synchronous insurance device, the triangle belt overload skidding, the arm self locking, the two level arm limit screw, and the tray limit set, which include the upper and lower limit stroke switches, the safety nut, the synchronous insurance device, the triangle belt overload skid, the arm self lock. What are the causes of the jitter failure of the double column lifter and how to eliminate it? (1) the lubrication between the rollers or the slider and the guide rail is poor, and the grease should be lubricated. (2) lubrication and wear of shaft sleeve and shaft in sprocket should be lubricated or replaced by grease. (3) sprocket and chain contact surface wear or damage, should replace the sprocket. (4) wear of roller or slider is serious and should be replaced in time. (5) there is air in the cylinder, and the air is discharged several times through reciprocating motion. What are the reasons for the automatic drop of hydraulic lift? (1) there are impurities or wear in the check valve of the hydraulic system. (2) the electromagnetic valve core on the pumping station of the hydraulic system is in a normally open state. (3) the cylinder piston seal is damaged, reaching the highest point with oil coming out. What are the reasons for the double column and hydraulic lifting machine not to come down? How to exclude (1) filter plugging at the oil return port and removing the cleaning. (2) the solenoid valve spool net plugging and dismantling cleaning. (3) the valve core of the timing valve is jammed and removed. (4) mechanical insurance is not opened or there are mechanical obstructions under the movement. Check the hook spring and exclude the card. (5) the slider or roller is lubricated with the guide rail or the rotating shaft, and should be lubricated with grease. The reasons for lifting the lift are: (1) lifting weights and overloading. (2) the speed adjusting valve can be adjusted too small by users or repairmen, and should be readjusted. (3) the gear pump is not replaced in time due to the hydraulic medium, and the gear pump should be replaced if the gear is worn. (4) there should be mechanical check on the lifting column or lifting machine. What are the safety devices of the Longmen lifter (1) hydraulic system relief valve and overload protection. (2) one way valve pressure protection. (3) the ultra high limit travel switch exceeds the limit stop. (4) mechanical self locking, synchronous insurance, and release. (5) the self locking device of the arm. (6) level two arm limit screw. What are the reasons for the slow down of Longmen hoist? (1) the hydraulic medium exceeds the use period or the pollution is serious. (2) blockage of the filter net of the oil back. (3) the valve core of the speed control valve is stuck. (4) there is a blockage in the joint of the tubing. What are the main points of four column lifter installation (1)? The four corners of the platform are at the same level. (2) the wire rope is in the right direction, and the loosening and depressing plate is complete. (3) the double nuts on the top of the wire rope tighten. (4) four safety blocks work at the same time, and can be adjusted by the top screw. (5) the manipulating handle is flexible. (6) the tubing is connected and fastened. (7) the electrical connection is correct.