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-rigidity double-pretightening damping system belongs to the technical field of ship equipment. The device is mainly applied to a dredger and consists of a trolley and a shock absorber. The platform truck passes through slide rail and linking arm to be fixed on the dredger, and the spud passes the platform truck, and the lower extreme inserts in submarine earth, can regard as hinged joint. The dredger is influenced by environmental load to generate six-degree-of-freedom irregular motion and influence the motion of the positioning pile, and the trolley converts the irregular motion into the motion of the positioning pile around the lower end point. The shock absorber is arranged on the connecting arm, and is provided with two springs with different rigidity and applies pretightening force. The double-rigidity double-pretightening damping system is arranged to reduce the influence of the motion load of the ship body on the positioning pile, prolong the service life of the positioning pile and improve the safety and the economic benefit 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. The utility model provides a two pretension shock mitigation system of two rigidity which characterized in that: comprises a trolley (1), a shock absorber (2) and a positioning pile; an upper hoop (5) is arranged at the upper part of the trolley (1), a lower hoop (5) is arranged at the lower part of the trolley, and linear bearings (6) are arranged in the upper hoop (5) and the lower hoop (5); the positioning pile penetrates through an upper hoop (5) and a linear bearing (6) in a lower hoop (10) of the trolley and is inserted into the silt, and the positioning pile can perform circumferential rotation movement and axial movement; the shock absorber (2) comprises a shock absorber shell a (11), a shock absorber shell b (12) and a shaft (21); one end of the shaft (21) is inserted into the shock absorber shell a (11), the other end of the shaft is inserted into the shock absorber shell b (12), and a first limiting nut (15) and a second limiting nut (16) are arranged on the shaft (21); the first limiting nut (15) and the second limiting nut (16) are both arranged between the shock absorber shell a (11) and the shock absorber shell b (12), and a spring A (13) is arranged between the first limiting nut (15) and the shock absorber shell a (11); a first sliding bearing (19) and a first adjusting nut (17) are arranged in the shock absorber shell a (11); the first sliding bearing (19) is arranged at the right end of the shock absorber shell a (11), and the first sliding bearing (19) is fixedly arranged on the shaft (21); the first adjusting nut (17) is arranged at the left end of the shaft (21), and the first adjusting nut (17) is arranged at the left side of the first sliding bearing (19); a second sliding bearing (20) and a second adjusting nut (18) are arranged in the shock absorber shell b (12); the second sliding bearing (20) is arranged at the left end of the shock absorber shell b (12), and the second sliding bearing (20) is fixedly arranged on the shaft (21); the second adjusting nut (18) is arranged at the right end of the shaft (21), the second adjusting nut (18) is arranged at the right side of the second sliding bearing (20), and a spring B (14) is arranged between the second adjusting nut (18) and the second sliding bearing (20); the rigidity coefficients of the spring A (13) and the spring B (14) are different; the two sides of the upper part of the trolley (1) are uniformly provided with upper bearings (7), and the upper bearings (7) are connected with a shock absorber shell b (12) of the shock absorber (2) through connecting arms; middle bearings (8) are uniformly arranged on two sides of the middle part of the trolley (1), and the middle bearings (8) are arranged on the dredger through sliding blocks and sliding rails (4); lower bearings (9) are uniformly arranged on two sides of the lower portion of the trolley (1), and connecting arms (3) are mounted on the lower bearings (9).