The name of the application inventor submitted to the State Intellectual Property Office on 2008-10-23: Oil circuit locking device for hydraulic push rod cylinder (200820186385.5). By lengthening the mating surface length of the spool and valve sleeve, the patented technology greatly improves the accuracy of operation, and then effectively avoids leakage during load, realizes the locking of the hydraulic push rod oil circuit, and ensures the working accuracy of the hydraulic push rod

The purpose of the utility model is to realize the following: the electric hydraulic push rod, which is mainly composed of a motor, a coupling, a oil pump, an integrated block and an oil cylinder connected successively, an oil storage cylinder is arranged outside the oil cylinder, the motor is arranged outside the oil storage cylinder, the coupling, the oil pump and an integrated block are arranged in the oil storage cylinder, and the oil cylinder mainly comprises a cylinder, an oil cylinder base, a piston, a piston rod and a fork head. One end of the cylinder extends out of the oil storage cylinder, and the end of the oil storage cylinder is welded with the cylinder, the cylinder base is connected with the end of the cylinder arranged in the oil storage cylinder, the piston is arranged in the cylinder, one end of the piston rod is connected with the piston, the other end of the piston rod is extended out of the cylinder and the fork head is connected, the cylinder extends out of the oil storage cylinder and the piston rod is arranged between the guide sleeve, The outer end of the guide sleeve is provided with a gland mounting slot, and the gland is provided in the gland mounting slot. The gland is connected with the cylinder thread, and the welding position on the outside of the cylinder is staggered with the thread position on the inside of the cylinder.

Electro-hydraulic plough discharger is widely used in power, metallurgy, coal, chemical, construction and port terminals and other transportation industries, we simply understand the electro-hydraulic plough discharger, electro-hydraulic plough discharger: With the electro-hydraulic push rod as the power source, when working, the push rod is extended to act on the drive rod, drive the frame forward, complete the fall of the plow cutter, and support the flat roller set, so that the working surface of the tape is straight, the lower edge of the plow cutter is closely fitted with the tape surface, and the material on the running tape is unloaded into the funnel (hopper), or unloaded to the required place. When the discharge is completed, the push rod is retracted to act on the drive rod, drive the frame back, lift the plow cutter, and the variable groove Angle idler group is deformed from the flat to the groove shape, so that the working surface of the belt can be restored to the groove shape and the material can pass smoothly; Because the electro-hydraulic push rod adopts hydraulic transmission, it has automatic overload protection performance. When the operation is blocked, the pressure in the oil circuit increases to the adjusted limit, and the overflow device spills quickly and accurately to implement overload protection. The motor runs within the rated value and will not burn out.