2results about How to "Sensitive control" patented technology

This invention belongs to the field of fluid transmission control and relates to an integrated cartridge-type multi-way valve specifically for pipe jacking machines. It includes a safety control valve assembly, a machine head rotation control valve assembly, a main jacking advance / retreat control valve assembly, a pressurization and flow merging direction control valve assembly, a machine head and main jacking pressurization and flow merging valve assembly, and a correction / relay control valve assembly. Each assembly has approximately the same dimensions and uses cartridge valves to control direction and flow. The cartridge valves employ valve core feedback closed-loop control to improve control accuracy. The pilot oil route for the cartridge valves is provided by a small-diameter three-position four-way directional valve. All assemblies are connected together by sealing rings and long bolts. This invention, by highly integrating the functions of various execution parts of the pipe jacking machine and using cartridge valves as the main valve core control, solves the problems of pipeline accumulation and low control accuracy in the pump station of pipe jacking machines. This significantly improves the construction efficiency of the pipe jacking machine, reduces power loss, makes operation more convenient, and is more suitable for construction in various geological formations.

The utility model relates to the technical field of grape planting auxiliary equipment, and particularly discloses a grape bud carving device which comprises a fixed clamping arm which is an arc-shaped support, the fixed clamping arm is hinged to a movable clamping arm through a hinge shaft, and the movable clamping arm can rotate relative to the fixed clamping arm so as to adjust the size of a clamping opening to adapt to grape branches and tendrils with different thicknesses; the fixed clamping arm and the movable clamping arm are each of an arc-shaped structure, and the end, provided with the hinge shaft, of the fixed clamping arm is fixedly connected with the handle rod. According to the grape bud carving device, precise adaptation is achieved through an adjusting structure on a movable clamping arm, a bud carving cutter is slidably connected into a buffer lining through hole of the movable clamping arm, two adjusting threaded rods in a limiting block are rotationally connected with the cutter, when the adjusting threaded rods are rotated, the bud carving cutter slides along the through hole, the bud carving depth is flexibly adjusted, and the bud carving efficiency is improved. Meanwhile, the rotating angle of the movable clamping arm relative to the fixed clamping arm is adjusted through cooperation of a pneumatic corrugated pipe and an arc-shaped sliding rail to adapt to branches and tendrils with different thicknesses.