Hydraulic flexible cable cutting knife

Abstract

The invention discloses a hydraulic flexible cable cutting knife, which comprises a control valve, a seawater or fresh water hydraulic cylinder and a shear movement mechanism which are connected in order, wherein the control valve controls the hydraulic cylinder to extend and retract; the hydraulic cylinder drives the shear movement mechanism to open and close by extending and retracting so as to realize shearing; the shear movement mechanism adopts a connecting rod-slide block mechanism; a slide block guide rail is integrated with the cylinder body into a whole, which has the characteristics of compact structure and high rigidity; a reversing valve is designed to have a three-position four-way structure; a contact mode of a valve plug and a valve seat of the reversing valve adopts a floating structure; and under the action of spring pressure, the valve plug and the valve seat always contact reliably, and a clearance after abrasion can be automatically compensated so as to greatly improve the reliability and service life of a seal. The hydraulic flexible cable cutting knife takes seawater or fresh water as a working medium, has the characteristics of high efficiency, large operational depth, convenient operation and good environmental compatability, and can be widely used for underwater and land shearing operation.

Description

technical field [0001] The invention relates to an underwater working tool, in particular to a hydraulic flexible cable cutter. Background technique [0002] The soft cable cutter is widely used in underwater operations. It can realize the cutting task of soft material cables such as hemp, palm, cotton, nylon, chemical fiber or copper / aluminum core cables. It is mainly used for underwater salvage, resources Underwater operations in fields such as mining and marine construction. The earliest flexible cable cutters for underwater operations were generally converted from land-use hydraulic drive tools. The hydraulic tools have high working pressure and high power density. [0003] Although the hydraulic tools have high working pressure and high power density, due to the physical and chemical characteristics of the hydraulic oil, there are the following problems when the modified hydraulic flexible cable scissors are used for underwater operations: [0004] 1) Hydraulic oil an...

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Problems solved by technology

[0004] 1) Hydraulic oil and water are incompatible. When hydraulic oil leaks into the water environment, it will cause environmental pollution. When used in the field of national defense and military, external leakage may also cause exposure to military activities. When water seeps into the hydraulic system, it will cause environmental pollution. Cause corrosion and functional failure of components, thereby reducing tool reliability;

[0005] 2) The oil pressure soft cable cutter and power source must be designed as a closed system, and oil inlet and outlet pipes are required. When used for large-depth operations, a pressure compensation device must be added, which increases the volume, weight and complexity of the equipment and reduces the system. reliability and maintainability;

[0006] 3) The viscosity of the hydraulic oil is high, and its viscosity-temperature and viscosity-pressure coefficients are large. With the expansion of the operating depth and scope, the pressure loss along the oil inlet and return pipes of the system increases significantly, and the tool efficiency decreases significantly; Oil pipelines are easily affected by wind, waves and currents, which increases the burden on divers during operation

[0007] 4) It is not possible to replace working tools underwater, or perform simple maintenance, and the adaptability of tools is poor

But at present, there is no mature hydraulic flexible cable cutter technical solution announced by the prior art

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