CN109850071B

CN109850071B - Double-rigidity double-pretightening damping system

Info

Publication number: CN109850071B
Application number: CN201910264066.4A
Authority: CN
Inventors: 赵大刚; 钟祥海; 张佐天; 林健峰; 林洪志; 汪瑜玮; 李元弟
Original assignee: Harbin Engineering University
Current assignee: Harbin Engineering University
Priority date: 2019-04-03
Filing date: 2019-04-03
Publication date: 2021-02-02
Anticipated expiration: 2039-04-03
Also published as: CN109850071A

Abstract

A double stiffness double preload shock absorption system belongs to the technical field of marine equipment. The device is mainly used in dredgers and consists of a trolley and a shock absorber. The trolley is fixed on the dredger through the sliding rail and the connecting arm, the positioning pile passes through the trolley, and the lower end is inserted into the underwater soil, which can be regarded as a hinged connection. The dredger is affected by the environmental load and produces six-degree-of-freedom irregular motion, which affects the movement of the positioning pile. The trolley converts this irregular movement into the movement of the positioning pile around the lower end point. The shock is mounted on the link arm, with two springs of different stiffnesses and preloaded. The installation of double stiffness and double preload shock absorption system reduces the influence of the hull motion load on the positioning pile, prolongs the service life of the positioning pile, and improves the safety and economic benefits of the dredger.

Description

Double-rigidity double-pretightening damping system

Technical Field

The invention belongs to the technical field of ship equipment, and particularly relates to a double-rigidity double-pretightening damping system.

Background

A dredger is a high-tech vessel, and a spud is an important structural component of the dredger. One section of the positioning pile is inserted into the sediment, the other end of the positioning pile is connected with the ship body, and in the working process, the environmental load and the working load borne by the dredger are finally acted on the positioning pile through transmission. Due to the poor wind and wave resistance of the dredger, the dynamic load is transmitted to the positioning pile, so that the positioning pile is subjected to fatigue failure. Therefore, reducing the effect of hull motion loads on the spud by installing a shock absorbing system is an important way to extend its useful life.

Disclosure of Invention

The invention aims to provide a double-rigidity double-pretightening damping system which is used for improving the wave resistance and safety of a dredger. The damping system can reduce the acting force of the ship body on the positioning pile, weaken fatigue damage and prolong the service life.

The purpose of the invention is realized as follows:

a double-rigidity double-pretightening damping system comprises a trolley 1, a damper 2, a connecting arm 3, a sliding rail 4 and a positioning pile; the trolley 1 is fixed on the dredger through a slide rail 4 and a connecting arm 3; the shock absorber 2 is arranged on the connecting arm 3 on one side, is of a double-spring structure and is connected with the connecting arm 3 in a flange plate mode; the positioning pile passes through the upper anchor ear 5 and the lower anchor ear 10 of the trolley and is inserted into the silt.

Linear bearings 6 are arranged in the upper anchor ear 5 and the lower anchor ear 10; the upper bearing 7, the middle bearing 8 and the lower bearing 9 are respectively provided with two bearings which are symmetrically arranged at two sides of the trolley, the upper bearing 7 and the lower bearing 9 are connected with the connecting arm 3, and the middle bearing 8 is connected with the sliding block and the sliding rail.

The shock absorber comprises two springs A13 and B14 with different stiffness coefficients, two outer shells, a shaft, a limit nut and an adjusting nut, wherein a first spring 13 and a second spring 14 exert pretightening force through the adjusting nut; sliding bearings are arranged in the first shock absorber shell 11 and the second shock absorber shell 12; the limit nut, the adjusting nut and the sliding bearing are all fixedly arranged on the shaft 21.

The invention has the beneficial effects that: the double-rigidity double-pretightening damping system is simple in design principle, has a clear structure, is easy to produce and is applied to a dredger. The system reduces the influence of the movement of the ship body on the positioning pile, weakens the fatigue damage of the positioning pile, can prolong the service life of the positioning pile and further improves the economic benefit of the dredger.

Drawings

FIG. 1 is a three-dimensional schematic view of a dual-stiffness dual-pretension damping system;

FIG. 2 is a schematic three-dimensional labeling diagram of a dual-stiffness dual-pretension damping system;

FIG. 3 is a three-dimensional schematic view of the trolley;

FIG. 4 is a side view of the trolley;

fig. 5 is a structural view of a shock absorber.

Detailed Description

The following further describes embodiments of the present invention with reference to the accompanying drawings:

in the figure: 1. the damping device comprises a trolley, 2. a damper, 3. a connecting arm, 4. a sliding block and a sliding rail, 5. an upper hoop, 6. a linear bearing, 7. an upper bearing, 8. a middle bearing, 9. a lower bearing, 10. a lower hoop, 11. a first damper shell, 12. a second damper shell, 13. a first spring, 14. a second spring, 15-16. a limiting nut, 17-18. an adjusting nut, 19-20. a sliding bearing and 21. a shaft.

The invention relates to a double-rigidity double-pretightening damping system. The double-rigidity double-pretightening damping system consists of a trolley and a damper. The trolley is fixed on the dredger through the sliding rail and the connecting arm. The positioning pile passes through the trolley and is inserted into the muddy sand. The trolley structure converts six-degree-of-freedom irregular motion of the dredger into rotation of the fixed pile around the lower end point. The connecting arm is provided with a shock absorber which has a double-spring structure, and the two springs have different rigidity and apply pretightening force. In the pretightening force range, the load generated by the movement of the ship body cannot cause the movement of the positioning pile; when the load generated by the movement of the ship body is greater than the pretightening force, the shock absorber works to weaken the influence of the movement of the ship body on the positioning pile

Referring to fig. 2, the double-rigidity double-pretension damping system comprises a trolley (1), four connecting arms (2), two dampers (3), a sliding block and a sliding rail (4). The shock absorber (3) is arranged on the connecting arm (2) on one side and connected in a flange plate mode.

Referring to fig. 3 and 4, the positioning pile passes through an upper anchor ear (5) and a lower anchor ear (10) of the trolley and is inserted into the muddy sand. A linear bearing (6) is arranged in the hoop, and the positioning pile can perform circumferential rotation movement and axial movement. The upper bearing (7), the middle bearing (8) and the lower bearing (9) are respectively two and are symmetrically arranged on two sides of the trolley. The upper bearing (7) and the lower bearing (9) are connected with the connecting arm (2), the middle bearing (8) is connected with the sliding block and the sliding rail (4), the trolley is further fixed on the dredger, and six-degree-of-freedom irregular motion influence of the dredger is converted into motion of the positioning pile around an end point.

Referring to fig. 5, the damper has two springs a (13) and B (14) with different stiffness coefficients, and the preload is applied by adjusting nuts (17.18). Sliding bearings (19.20) are arranged in the damper housing a (11) and the damper housing b (12), and the sliding friction force of the shaft (21) is reduced. The limiting nut (15.16), the adjusting nut (17.18) and the sliding bearing (19.20) are all fixedly arranged on the shaft. In practice, the damper housing b (12) is connected to the trolley, assuming it is stationary. If the damper shell a (11) moves rightwards, the pretightening force of the spring A (13) needs to be overcome; when the limiting nut moves rightwards, the limiting nut (15) and the shock absorber shell B (12) keep relative positions, the compression amount of the spring B (14) is not changed, and the shock absorber shell a (11) presses the spring A (13). If the shock absorber shell a (11) moves leftwards, the pretightening force of the spring B (14) needs to be overcome firstly; when the spring moves leftwards, the limiting nut (16) moves leftwards together, the compression amount of the spring A (13) is not changed, and the adjusting nut (18) extrudes the spring to generate elastic force.

A double-rigidity double-pretightening damping system comprises a trolley and a damper, wherein the damper is arranged on a connecting arm of the trolley, and the trolley converts six-degree-of-freedom motion of a dredger into motion of a positioning pile around a lower end point by utilizing structures such as a linear bearing, a sliding block, a sliding rail and the like; the main components of the shock absorber comprise two springs with different rigidity, two outer shells, a shaft, a limit nut, an adjusting nut and the like. The pre-tightening force can be applied to the spring through the adjusting nut; if one of the shells is not moved, the other shell moves forwards or backwards to overcome the pretightening force, and only the expansion and contraction amount of one of the springs is changed, and the expansion and contraction amount of the other spring is not changed.

Claims

1. A double stiffness double preload shock absorption system, characterized in that: it comprises a trolley (1), a shock absorber (2) and a positioning pile; the upper part of the trolley (1) is provided with an upper hoop (5). ), the lower part of the trolley is provided with a lower hoop (5), and a linear bearing (6) is arranged in the upper hoop (5) and the lower hoop (5); the positioning pile passes through the upper hoop of the trolley The hoop (5) and the linear bearing (6) in the lower hoop (10) are inserted into the mud and sand, and the positioning pile can perform circumferential rotational motion and axial motion; the shock absorber (2) includes a shock absorber housing a (11), shock absorber housing b (12) and shaft (21); one end of the shaft (21) is inserted into the shock absorber housing a (11), and the other end is inserted into the shock absorber housing In b(12), a first limit nut (15) and a second limit nut (16) are arranged on the shaft (21); the first limit nut (15) and the second limit nut ( 16) Both are arranged between the shock absorber housing a (11) and the shock absorber housing b (12), and between the first limit nut (15) and the shock absorber housing a (11) Spring A (13); a first sliding bearing (19) and a first adjusting nut (17) are arranged inside the shock absorber housing a (11); the first sliding bearing (19) is arranged in the reducing The right end of the shock housing a (11), and the first sliding bearing (19) is fixedly arranged on the shaft (21); the first adjusting nut (17) is installed on the left end of the shaft (21), and the first sliding bearing (19) is fixed on the shaft (21); The adjusting nut (17) is arranged on the left side of the first sliding bearing (19); the shock absorber housing b (12) is provided with a second sliding bearing (20) and a second adjusting nut (18) inside; The second sliding bearing (20) is arranged at the left end of the shock absorber housing b (12), and the second sliding bearing (20) is fixedly arranged on the shaft (21); the second adjusting nut (18) Installed on the right end of the shaft (21), and the second adjusting nut (18) is arranged on the right side of the second sliding bearing (20), between the second adjusting nut (18) and the second sliding bearing (20) is provided Spring B (14); the stiffness coefficients of the spring A (13) and the spring B (14) are different; the upper bearing (7) is arranged on both sides of the upper part of the trolley (1), and the upper bearing (7) It is connected with the shock absorber housing b (12) of the shock absorber (2) through the connecting arm; the middle bearing (8) is arranged on both sides of the middle part of the trolley (1), and the middle bearing (8) passes through the slider. The slide rail (4) is installed on the dredger; the lower bearing (9) is arranged on both sides of the lower part of the trolley (1), and a connecting arm (3) is installed on the lower bearing (9).