CN-121612140-B - Offshore detection method for main bearing of catenary single-point mooring device

CN121612140BCN 121612140 BCN121612140 BCN 121612140BCN-121612140-B

Abstract

The invention relates to the technical field of bearing detection, in particular to a marine detection method of a main bearing of a catenary single-point mooring device, which comprises an axial and radial play measurement method of the main bearing, wherein a magnetic gauge seat is adsorbed on the upper end face of an inner ring of the main bearing, a dial gauge is propped against the upper end face of an outer ring of the main bearing, a hydraulic cylinder is used for propping up a rotating part to measure the axial play of the main bearing, the magnetic gauge seat is adsorbed on the upper end face of the outer ring of the main bearing, the dial gauge is propped against the inner diameter surface of the inner ring of the main bearing, and a first pull block, a second pull block and a second pull block are arranged in the same radial direction of the magnetic gauge seat and the dial gauge, and the radial play of the main bearing is measured. The single-point catenary mooring device can realize detection and evaluation under the in-service state, parts to be replaced and maintenance tools can be prepared according to detection results without stopping, the stopping period of the single-point catenary mooring device is shortened, and the loss caused by stopping the single-point catenary mooring device is obviously reduced.

Inventors

ZHANG PENGLI
FENG WENHUA
WANG XIAOJING
MING RUHAI
SONG QINGZHU
CHEN ZHIYU
YAN HAN
ZOU GUANGLE
CUI JIANWEI

Assignees

大连船舶重工集团装备制造有限公司

Dates

Publication Date: 20260505
Application Date: 20260203

Claims (5)

1. The marine detection method of the catenary single-point mooring device main bearing comprises a water pontoon, wherein the water pontoon comprises a rotating part and a fixed part, a bearing system is respectively connected with the rotating part and the fixed part so as to enable the rotating part and the fixed part to rotate relatively, and the bearing system comprises the main bearing and is characterized in that: the offshore detection method comprises an axial and radial clearance measurement method of the main bearing; The method for measuring the axial and radial play of the main bearing comprises the following specific steps: S410, a magnetic meter seat is adsorbed on the upper end face of the inner ring of the main bearing, a dial indicator supports against the upper end face of the outer ring of the main bearing, a rotating part is lifted by a hydraulic cylinder, the hydraulic cylinder is gradually pressurized to twice the overturning moment of the rotating part, the displacement of the outer ring of the main bearing is measured by the dial indicator, and half of the displacement is the axial play of the main bearing, and the step S411 is started; s411, adsorbing a magnetic meter seat on the upper end face of the outer ring of the main bearing, propping up the inner diameter surface of the inner ring of the main bearing by a dial indicator, and starting step S412 or step S413; S412, a fixed part is connected with a first pull chain block, the first pull chain block is connected with a first tension meter, the first tension meter is connected with a rotating part, the fixed part is connected with a second pull chain block, the second pull chain block is connected with a second tension meter, and the second tension meter is connected with the rotating part, wherein the first pull chain block, the first tension meter, the second tension meter and the second pull chain block are all arranged on the same radial direction of the magnetic meter seat and the dial indicator in the step S411, the first pull chain block and the second pull chain block are symmetrically arranged, and the first tension meter and the second tension meter are symmetrically arranged, and the step S420 is started; S413, a fixed part is connected with a first chain block, the first chain block is connected with a first tension gauge, the first tension gauge is connected with a rotating part, the fixed part is connected with a second chain block, the second chain block is connected with a second tension gauge, the second tension gauge is connected with the rotating part, the fixed part is connected with a third chain block, the third chain block is connected with a third tension gauge, the third tension gauge is connected with the rotating part, the first chain block and the first tension gauge are arranged on the same radial direction of the magnetic gauge stand and the dial gauge in the step S411, the second chain block and the third chain block are symmetrically arranged on two sides of a central line by taking the same radial direction of the magnetic gauge stand and the dial gauge in the step S411 as the central line, and the second tension gauge and the third tension gauge are symmetrically arranged on two sides of the central line, and the step S420 is started; s420, firstly, enabling a second chain block to be in a loose state, slowly increasing the pulling force of the first chain block to be twice of that of a dial indicator with obvious displacement reading, and recording the reading of the dial indicator; secondly, slowly releasing the first hand-pulling hoist to a loose state, slowly increasing the pulling force of the second hand-pulling hoist to twice that of the dial indicator with obvious displacement reading, recording the reading of the dial indicator, Half of the difference between the two readings is the radial play of the main bearing; s430, repeating the steps S410-S420 every 90 degrees along the circumferential direction of the main bearing on the water pontoon, and recording the axial play and the radial play of the main bearing, wherein the axial play and the radial play are used for comparing with theoretical values and evaluating the technical state of the main bearing.
2. The offshore inspection method of a catenary single point mooring main bearing according to claim 1, wherein the offshore inspection method comprises a pre-inspection preparation and safety verification method, The preparation and safety confirmation method before detection comprises the following specific steps: s110, all electronic products used in the detection process meet the explosion-proof requirement; s120, inquiring the basic condition of a bearing system of an operator of the catenary single-point mooring device, and checking maintenance records of the bearing system so as to realize basic understanding of the main bearing; s130, inquiring local sea conditions of an operator of the catenary single-point mooring device, checking input conditions of wind wave current when the device is designed, and particularly paying attention to the high-frequency direction of the wind wave current; S140, after the used tools are ready, selecting a windless and wave-less ship to detect under the condition of berthing of the ship without liquid cargo; S150, before detection, replacing inflammable and explosive liquid cargoes in the pipeline of the catenary single-point mooring device with water or other non-inflammable and explosive products, otherwise, carrying out special security risk assessment, and agreeing with an operator of the catenary single-point mooring device; and S160, before detection, simultaneously closing the liquid cargo transmission pipeline at the upstream of the water pontoon and the liquid cargo transmission pipeline at the downstream of the water pontoon, and when the rotating part does not rotate in the detection process, keeping the rotating part and the fixed part in a locking state and connecting the ground wire between the rotating part and the fixed part.
3. The marine inspection method of a catenary single point mooring main bearing according to claim 1, wherein the marine inspection method comprises a main bearing rotation test and a moment measurement method, The main bearing rotation test and moment measurement method comprises the following specific steps: s310, dragging the rotating part to rotate anticlockwise and rotate clockwise, and confirming whether obvious clamping exists during rotation or whether abnormal noise exists or not; S320, one end of the chain block is connected with the fixed part, the other end of the chain block is connected with the tension meter, the other end of the tension meter is connected with the rotating part, the chain block is pulled to rotate the rotating part, and the starting moment and the rotating moment of the rotating part are measured; S330, repeating the step S320 every 90 degrees along the clockwise direction and the anticlockwise direction of the circumference of the main bearing on the water pontoon, and measuring the starting moment and the rotating moment of the rotating part, wherein the starting moment and the rotating moment are used for comparing with theoretical values and evaluating the technical state of the bearing.
4. The marine inspection method of a catenary single point mooring main bearing according to claim 1, wherein the marine inspection method comprises a main bearing appearance inspection method, and the main bearing appearance inspection method comprises the following specific steps: s210, opening the waterproof cover, and visually checking whether the protection function of the waterproof cover is normal, whether water enters the main bearing cabin, whether the connection of the lubrication system is perfect and whether the lubrication function is normal; S220, visually checking whether the main bearing is rusted and mechanically damaged or not, and visually checking whether a dustproof sealing ring of the main bearing is damaged or not, and whether the dustproof sealing ring is tightly attached to the main bearing or not; and S230, after finishing the appearance inspection of the main bearing, filling lubricating grease into the main bearing if no obvious unacceptable defect exists, and carrying out the rotation test and the rotation moment measurement of the main bearing.
5. The marine inspection method of a catenary single point mooring main bearing according to claim 4, wherein the marine inspection method comprises a method for analyzing the granularity of main bearing grease, and the method for analyzing the granularity of the main bearing grease comprises the following specific steps: S500, the lubricating grease newly released from the main bearing is taken out and sent to a laboratory for particle size distribution analysis, and the analysis result is compared with the particle size distribution of the new lubricating grease with the same brand and model and is used for evaluating the technical state of the main bearing.

Description

Offshore detection method for main bearing of catenary single-point mooring device Technical Field The invention relates to the technical field of bearing detection, in particular to a marine detection method of a main bearing of a catenary single-point mooring device. Background The catenary single-point mooring device has the characteristics of less limitation on the operation environment, high operation efficiency, low manufacturing cost, short construction period and the like, has obvious advantages compared with the traditional island type wharf or jetty wharf, becomes an important wharf form of liquid cargo passing between a liquid cargo ship and a land tank area, and has wide application. The main bearing is the key device of the catenary single point mooring device, and is connected with the rotating and fixing parts of the floating pontoon on the water of the catenary single point mooring device, usually three rows of roller turntable bearings, and is responsible for realizing the relative movement of the rotating part and the fixing part and transmitting the mooring force from the liquid cargo ship to the seabed anchor point. The main bearing is the most vulnerable key component of the catenary single point mooring due to the long-term accumulation of large mooring force impacts. In order to avoid the unplanned shutdown accident of the catenary single-point mooring device caused by sudden damage failure of the main bearing in the service period, the design life of the catenary single-point mooring device is 25 years, and good practice is that the catenary single-point mooring device is planned to be shutdown every 10 to 15 years, and the main bearing is comprehensively inspected and overhauled once when the water pontoon is towed back to the land. The traditional method for carrying out comprehensive inspection and overhaul on the main bearing is that the main bearing is comprehensively inspected after the water pontoon is towed back to the land for disassembly, then the replacement part is purchased for overhaul, and the pontoon is towed back to the sea for installation after being reinstalled. In the stop period of the catenary single-point mooring device, the liquid cargo passing between the liquid cargo ship and the land tank area cannot be realized, huge loss can be caused to related industries, and the shortening of the stop period of the catenary single-point mooring device is an inherent requirement of related parties. Disclosure of Invention In view of the defects in the prior art, the invention provides an offshore detection method for a main bearing of a catenary single-point mooring device, which can realize detection and evaluation of the catenary single-point mooring device in a service state, and can prepare a part to be replaced and a maintenance tool according to a detection result without stopping, thereby shortening the stopping period of the catenary single-point mooring device and obviously reducing the loss caused by stopping the catenary single-point mooring device. In order to achieve the above object, the technical scheme provided by the invention is that the marine detection method of the main bearing of the catenary single-point mooring device comprises a water pontoon, wherein the water pontoon comprises a rotating part and a fixed part, a bearing system is respectively connected with the rotating part and the fixed part so as to enable the rotating part and the fixed part to rotate relatively, the bearing system comprises a main bearing, The offshore detection method comprises an axial and radial clearance measurement method of the main bearing; The method for measuring the axial and radial play of the main bearing comprises the following specific steps: S410, a magnetic meter seat is adsorbed on the upper end face of the inner ring of the main bearing, a dial indicator supports against the upper end face of the outer ring of the main bearing, a rotating part is lifted by a hydraulic cylinder, the hydraulic cylinder is gradually pressurized to twice the overturning moment of the rotating part, the displacement of the outer ring of the main bearing is measured by the dial indicator, and half of the displacement is the axial play of the main bearing, and the step S411 is started; s411, adsorbing a magnetic meter seat on the upper end face of the outer ring of the main bearing, propping up the inner diameter surface of the inner ring of the main bearing by a dial indicator, and starting step S412 or step S413; S412, a fixed part is connected with a first pull chain block, the first pull chain block is connected with a first tension meter, the first tension meter is connected with a rotating part, the fixed part is connected with a second pull chain block, the second pull chain block is connected with a second tension meter, and the second tension meter is connected with the rotating part, wherein the first pull chain block, the first tension meter, the second tension mete