At present, the diameter of submarine cable generally exceeds 200mm, and more and more attention is paid to the control of bending radius in the process of construction. Especially in the launching stage of submarine cable underwater burying machine, it is originally the biggest risk point of construction operation. Once the bending radius of submarine cable is out of control in this stage, it will affect the subsequent construction and operation of the whole line. Since the submarine cable burying machine needs to work under the set buried depth condition, its overall shape tends to meet the ideal state of submarine cable bending radius control during buried depth operation. However, in the launching stage of the burying machine, because the blades of the burying machine are mostly in the initial lifting state close to zero, although the bell mouth design is mostly adopted at the tail outlet, it is limited by the length and strength of the blades, It can not strictly meet the design conditions of submarine cables, resulting in the risk that the minimum bending radius of submarine cables is not controlled in the launching stage of burying machines.

In view of the above situation, a device is needed, which can limit the bending radius of submarine cable to a certain extent during the launching stage of submarine cable burying machine, and can quickly separate from the blade of burying machine underwater according to the needs after the launching operation, so as not to affect the subsequent buried depth operation.

The modular submarine cable bending limiter at the front end of the hydraulic blade of the submarine cable burying machine is mainly used to control the bending radius of the submarine cable at the outlet of the hydraulic blade of the submarine cable burying machine during the delivery of the submarine cable burying machine, prevent the submarine cable from damage, and quickly separate from the burying machine blade after the delivery of the submarine cable burying machine.

In order to achieve the above purpose, the technical scheme adopted by the invention to solve its technical problems is: a modular submarine cable bending limiter at the front end of the hydraulic blade of the submarine cable burying machine, including a hydraulic blade connector and a hydraulic blade connecting pin, a bending limiter body, a connecting pin between the bending limiters and a limit stop rod, The front end of the hydraulic blade connector is connected with the blade outlet end of the submarine cable burying machine through the hydraulic blade connecting pin, the rear end is connected with the bending limiter body through the connecting pin between the bending limiters, the bending limiter bodies are connected through the connecting pin between the bending limiters, and the limit stop rods are installed on both sides of the hydraulic blade connector and the bending limiter body respectively, Form a modular submarine cable bending limiter.

Further, the modular submarine cable bending limiter is pre installed at the outlet end of the cable cavity at the front end of the hydraulic blade of the submarine cable burying machine during the launching operation, and the modular submarine cable bending limiter is used to limit the bending radius of the submarine cable during the launching stage of the burying machine, Prevent the bending radius of the submarine cable at the outlet of the front end of the hydraulic blade of the submarine cable burying machine from getting out of control in the process of dropping the submarine cable burying machine to contacting the seabed surface. At the same time, after the bending limiter contacts the seabed surface, it can fit the seabed shape until the burying machine is put into operation.

Further, after the launching operation of the submarine cable burying machine is completed, the diver shall pull out the limit lever, the hydraulic blade connecting pin and the connecting pin between the bending limiter underwater, separate the modular submarine cable bending limiter from the hydraulic blade of the burying machine and recover it, so that the burying machine can normally carry out the submarine cable laying and burying operation.