Shark clamp oil cylinder pressure protection system

Abstract

The invention discloses a pressure protection system for an oil cylinder of shark pincers, and belongs to the technical field of shark pincers. The pressure protection system comprises the oil cylinder, a power system, a three-position four-way electro-hydraulic reversing valve, a first hydraulic-control proportional reversing valve, a second hydraulic-control proportional reversing valve, a first overflow valve and a second overflow valve. A first port of the first hydraulic-control proportional reversing valve, a first port of the first overflow valve and a channel of the second hydraulic-control proportional reversing valve are communicated with a third port of the three-position four-way electro-hydraulic reversing valve, a first port of the second hydraulic-control proportional reversing valve, a first port of the second overflow valve and a channel of the first hydraulic-control proportional reversing valve are communicated with a fourth port of the three-position four-way electro-hydraulic reversing valve, other ports of the first hydraulic-control proportional reversing valve and a second port of the first overflow valve are connected with a rodless cavity of the oil cylinder, and other ports of the second hydraulic-control proportional reversing valve and a second port of the second overflow valve are connected with a rod cavity of the oil cylinder. The pressure protection system has the advantages that stress on the oil cylinder can be reduced when a working load of the shark pincers has large tonnage, so that low pressure of the shark pincers is guaranteed, and the shark pincers are assuredly reliable in work.

Description

technical field [0001] The invention relates to the technical field of shark pliers, in particular to a pressure protection system for a shark pliers cylinder. Background technique [0002] Shark clamp is a device widely used in ships. Its function is to hold the anchor chain or cable tightly when the ship is docked to prevent the anchor chain or cable from slipping. Generally, the mechanical device of the shark pliers is fixedly connected with the piston rod of the rod chamber of the oil cylinder. After the oil enters the rodless chamber, the oil will push the piston rod up, thereby pushing the mechanical device of the shark pliers upward, so that the shark pliers rise. To make the shark pliers hold the anchor chain or cable tightly. After the oil enters the rod cavity, the oil will push the piston rod down, thereby pushing the mechanical device of the shark pliers to move downward, so that the shark pliers will descend, so that the shark pliers can be released. Open the a...

AI Technical Summary

Problems solved by technology

[0005] The three-position four-way electro-hydraulic reversing valve, hydraulic control check valve and one-way throttle valve can maintain the pressure of the oil cylinder, but when the working load of the shark jaw is large tonnage, the force on the oil cylinder cannot be reduced, resulting in the pressure of the shark jaw Larger and unreliable

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