CN116204991A - Design calculation method for ship lift steel wire rope-buffer oil cylinder anti-collision device - Google Patents
Design calculation method for ship lift steel wire rope-buffer oil cylinder anti-collision device Download PDFInfo
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Abstract
The invention provides a ship lift steel wire rope-buffer oil cylinder anti-collision device design calculation method, which comprises the following steps: providing buffer oil cylinder selection recommendation parameter tables of anti-collision devices corresponding to blocking ships with different rated drainage according to engineering experience of built ship lifts; according to the parameters of the buffer oil cylinder and the strength requirement of the steel wire rope, carrying out design calculation on the steel wire rope; calculating kinetic energy when the ship stall impacts the steel wire rope; according to the energy conversion principle, calculating the buffer distance of the buffer oil cylinder; according to the geometric relationship, calculating the horizontal travelling distance of the ship, and obtaining the maximum travelling distance limit value of the ship under the condition that the ship does not strike the cabin door, so as to judge whether the design of the steel wire rope-buffer oil cylinder anti-collision device meets the arrangement requirement. According to the invention, under the condition of fully considering the factors of the attached water quality, the bow angle of the ship, the elastic deformation of the steel wire rope and the like, the design calculation is carried out on the steel wire rope-buffer oil cylinder anti-collision device, and the blank in the aspect of the design of the anti-collision device on the ship lift is filled.
Description
Technical Field
The invention relates to ship lift engineering in the field of hydraulic and hydroelectric engineering, in particular to a design calculation method suitable for a ship lift steel wire rope-buffer oil cylinder anti-collision device.
Background
The anti-collision device is a safety device which is arranged on the inner side of the ship compartment door of the ship lift and used for preventing the ship entering the ship compartment from being out of control and then striking the ship compartment door, thereby causing a disaster accident caused by a large amount of water leakage of the ship compartment. The anti-collision device needs to absorb and dissipate the kinetic energy of the ship before the ship collides with the door of the ship compartment, so that the purpose of effectively blocking and preventing the stalled ship is achieved, and the reasonable design of the anti-collision device is very important for ensuring the operation and equipment safety of the ship lift.
In ship lift engineering with larger ship passing scale, the anti-collision device is mainly in the form of a steel wire rope-buffer oil cylinder. The anti-collision device adopts the steel wire rope to block the ship, the two ends of the steel wire rope are connected with the buffer cylinders, and when the ship stalls to strike the steel wire rope, the kinetic energy of the ship is mainly absorbed through the elastic deformation of the steel wire rope and the acting of the buffer cylinders, so that the anti-collision device is a complex energy conversion process. The anti-collision device meets two conditions during design, namely, the anti-collision device can absorb the kinetic energy of a stall ship; secondly, the ship cannot collide with the ship compartment door at the end of the collision process, and a certain distance margin is maintained. The related references at present have little research on the wire rope-buffer cylinder anti-collision device, and certain limitations exist, and the related references mainly show the following aspects: (1) The influence of the attached water quality is not considered, the calculated value of the kinetic energy of the ship is lower than the actual value, and the calculated result is unsafe; (2) The ship advancing distance is calculated without considering the bow angle, so that the calculated value is smaller than the actual value, and the calculated result is unsafe; (3) The calculation of the oil cylinder buffer distance does not consider the elastic performance of the steel wire rope and has a difference with the actual physical process; moreover, the related specifications of the ship lift have no unified design and calculation method for the collision prevention device of the steel wire rope and the buffer oil cylinder.
Disclosure of Invention
The invention aims to provide a design calculation method of a steel wire rope-buffer oil cylinder anti-collision device suitable for a ship lift, and provides a calculation method of a buffer oil cylinder type recommended parameter table, a steel wire rope type recommended parameter table, stall ship kinetic energy considering attached water quality, a buffer oil cylinder buffer distance and a ship travelling distance of anti-collision device corresponding to blocking ships with different rated drainage amounts, and a method for judging whether the design of the steel wire rope-buffer oil cylinder anti-collision device meets arrangement requirements.
A design calculation method suitable for a ship lift steel wire rope-buffer oil cylinder anti-collision device comprises the following steps:
according to the engineering experience of the built ship lift, providing a buffer oil cylinder type selection recommended parameter table of a buffer device corresponding to the blocking ships with different rated drainage amounts, wherein the buffer oil cylinder type selection recommended parameter table of the buffer device comprises a buffer oil cylinder pre-tightening oil pressure, a buffer oil cylinder overflow pressure, a buffer oil cylinder inner diameter and a buffer oil cylinder piston rod diameter;
selecting a steel wire rope model according to the overflow pressure of the buffer oil cylinder, the inner diameter of the buffer oil cylinder body, the diameter of a piston rod of the buffer oil cylinder and the strength requirement of the steel wire rope in a buffer oil cylinder selection recommendation parameter table of the anti-collision device, wherein the selected steel wire rope model comprises the diameter of the steel wire rope, the effective cross-sectional area of the steel wire rope and the strength grade of the steel wire rope;
calculating kinetic energy when the ship stall impacts the steel wire rope;
under the condition that the pre-tightening oil pressure of the buffer oil cylinder, the overflow pressure of the buffer oil cylinder, the inner diameter of the cylinder body of the buffer oil cylinder, the diameter of a piston rod of the buffer oil cylinder and the effective cross-section area of the steel wire rope are known, according to the energy conversion principle that the kinetic energy obtained when the ship stall is impacted on the steel wire rope is converted into the deformation energy of the steel wire rope and the heat energy of the buffer oil cylinder, the buffer distance of the buffer oil cylinder is calculated;
according to the buffer distance and the geometric relation, calculating the horizontal travelling distance of the ship, and judging whether the design of the steel wire rope-buffer oil cylinder anti-collision device meets the arrangement requirement according to the horizontal travelling distance of the ship and the maximum travelling distance limit value of the ship under the condition that the ship does not strike the ship compartment door.
Further, according to the requirements of the buffer cylinder overflow pressure, the buffer cylinder inner diameter, the buffer cylinder piston rod diameter and the steel wire rope strength in the buffer cylinder selection recommendation parameter table of the anti-collision device, the steel wire rope is subjected to selection design calculation, and specifically, the method comprises the following steps:
wherein S is b For minimum breaking force of steel wire rope, p e The overflow pressure of the oil cylinder is buffered; d (D) ci The inner diameter of the cylinder body of the buffer oil cylinder is the inner diameter of the cylinder body of the buffer oil cylinder; d, d p And selecting the type of the steel wire rope by combining the steel wire rope product sample for buffering the diameter of the piston rod of the oil cylinder.
Further, the kinetic energy of the ship stall when striking the wire rope is calculated taking into account the attached water quality effect:
wherein E is s Kinetic energy when the ship stalls and impacts the steel wire rope; m is M c Is the total mass of the ship and is equal to the rated displacement of the ship in value; v is the maximum allowable speed of the ship entering the compartment; lambda is the attached water quality coefficient.
Further, the buffer distance of the buffer oil cylinder is calculated, and the specific formula is as follows:
wherein d cp For buffering the oil cylinder buffer distance E s For kinetic energy when the ship stall hits the steel wire rope, D ci The inner diameter of the cylinder body of the buffer oil cylinder is the inner diameter of the cylinder body of the buffer oil cylinder; d, d p The diameter of a piston rod of the buffer oil cylinder is; p is p e The overflow pressure of the oil cylinder is buffered; p is p 0 Pre-tightening oil pressure for the buffer oil cylinder; a is the effective cross-sectional area of the steel wire rope; l is the distance between steel wire rope fulcrums; e is the elastic modulus of the steel wire rope.
Further, according to the buffer distance and the geometric relationship, calculating the horizontal travelling distance of the ship, wherein the specific formula is as follows:
wherein, I sh Is the horizontal travel distance of the ship; d, d cp The buffer distance is the buffer distance of the buffer oil cylinder; delta is the elastic elongation of the steel wire rope after the ship collision, and is determined according to the formula (5); beta is the bow inclination angle of the ship; l is the distance between steel wire rope fulcrums.
Further, whether the design of the steel wire rope-buffer oil cylinder anti-collision device meets the arrangement requirement is judged according to the horizontal travelling distance of the ship and the maximum travelling distance limit value of the ship under the condition that the ship does not strike the ship compartment door, specifically:
wherein, I sh Is the horizontal travel distance of the ship; d, d gc The distance from the ship compartment door to the blocking steel wire rope is set; delta h The vertical distance between the top of the compartment door and the blocking steel wire rope;
if the formula (6) is established, the design of the steel wire rope-buffer oil cylinder anti-collision device is proved to meet the arrangement requirement; if the formula (6) is not established, the parameters of the buffer oil cylinder are required to be adjusted, and rechecking is performed again.
The invention has the following beneficial effects:
1. the invention provides a design calculation method of a ship lift steel wire rope-buffer oil cylinder anti-collision device, which comprises a buffer oil cylinder type selection recommendation parameter table of anti-collision devices corresponding to blocking ships with different rated drainage amounts, a calculation method of steel wire rope type selection, stall ship kinetic energy considering attached water quality, buffer oil cylinder buffer distance and ship travelling distance, and a method for judging whether the design of the steel wire rope-buffer oil cylinder anti-collision device meets arrangement requirements;
2. the design calculation of the ship lift steel wire rope-buffer oil cylinder anti-collision device considers the attached water quality, the ship bow angle and the elastic deformation performance of the steel wire rope, so that the calculation result is more matched with the actual stress and physical process, and the design rationality of the anti-collision device is ensured.
Drawings
FIG. 1 is a simplified and calculated plan view of a wireline-buffer cylinder force;
FIG. 2 is a simplified and calculated elevation of a wireline-buffer cylinder force;
fig. 3 is a diagram showing the piston rod travel and the crashproof rope stress change of a real-ship test of a crashproof device of a ship lift of a home dam.
Detailed Description
The invention is further described below with reference to the drawings and detailed description. It should be understood that the following detailed description is merely illustrative of the invention and is not intended to limit the scope of the invention.
Referring to fig. 1-3, an embodiment of the invention provides a design calculation method for a ship lift steel wire rope-buffer oil cylinder collision avoidance device, which comprises the following steps:
step one, selecting recommended parameters of a buffer cylinder of the anti-collision device are shown as follows:
step two, according to the requirements of the buffer cylinder overflow pressure, the buffer cylinder inner diameter, the buffer cylinder piston rod diameter and the steel wire rope strength in the buffer cylinder selection recommendation parameter table of the anti-collision device, selecting the steel wire rope, and specifically, the method comprises the following steps:
wherein S is b For minimum breaking force of steel wire rope, p e The overflow pressure of the oil cylinder is buffered; d (D) ci The inner diameter of the cylinder body of the buffer oil cylinder is the inner diameter of the cylinder body of the buffer oil cylinder; d, d p And selecting the type of the steel wire rope by combining the steel wire rope product sample for buffering the diameter of the piston rod of the oil cylinder.
Thirdly, calculating kinetic energy when the ship stall impacts the steel wire rope, and considering the influence of attached water quality:
wherein E is s Kinetic energy when the ship stalls and impacts the steel wire rope; m is M c Is the total mass of the ship and is equal to the rated displacement of the ship in value; v is the maximum allowable speed of the ship entering the compartment; lambda is the attached water quality coefficient.
Step four, calculating the buffer distance of the buffer oil cylinder, wherein the specific formula is as follows:
wherein d cp For buffering the oil cylinder buffer distance E s For kinetic energy when the ship stall hits the steel wire rope, D ci The inner diameter of the cylinder body of the buffer oil cylinder is the inner diameter of the cylinder body of the buffer oil cylinder; d, d p The diameter of a piston rod of the buffer oil cylinder is; p is p e The overflow pressure of the oil cylinder is buffered; p is p 0 Pre-tightening oil pressure for the buffer oil cylinder; a is the effective cross-sectional area of the steel wire rope; l is the distance between steel wire rope fulcrums; e is the elastic modulus of the steel wire rope.
Step five, calculating the horizontal advancing distance of the ship according to the buffer distance and the geometric relationship, wherein the specific formula is as follows:
wherein, I sh Is the horizontal travel distance of the ship; d, d cp The buffer distance is the buffer distance of the buffer oil cylinder; delta is the elastic elongation of the steel wire rope after the ship collision, and is determined according to the formula (5); beta is the bow inclination angle of the ship; l is the distance between steel wire rope fulcrums.
Step six, according to the horizontal travelling distance of the ship and the condition that the ship does not strike the ship compartment door
The maximum travel distance limit value judges whether the design of the steel wire rope-buffer oil cylinder anti-collision device meets the arrangement requirement, and specifically comprises the following steps:
wherein, I sh Is the horizontal travel distance of the ship; d, d gc The distance from the ship compartment door to the blocking steel wire rope is set; delta h The vertical distance between the top of the compartment door and the blocking steel wire rope;
if the formula (6) is established, the design of the steel wire rope-buffer oil cylinder anti-collision device is proved to meet the arrangement requirement; if the formula (6) is not established, the parameters of the buffer oil cylinder are required to be adjusted, and rechecking is performed again.
The technical solution of the present invention will be described below with specific examples (to a dam lift).
The ship lift for the home dam adopts a steel wire rope-buffer oil cylinder anti-collision device, 2 sleeves are arranged at the inner sides of the ship compartment doors at the two ends in an antisymmetric way. The capacity of the bump guard was designed to strike a 1000t displacement vessel at a rate of 0.5 m/s.
(1) Buffer cylinder for determining anti-collision device
Referring to a 'buffer cylinder selection recommendation parameter table of an anti-collision device', the parameters of the buffer cylinder are selected as follows: the pre-tightening oil pressure is 3MPa, the overflow pressure is 14MPa, the inner diameter of the cylinder body is 250mm, and the diameter of the piston rod is 125mm.
(2) According to the parameters of the buffer oil cylinder and the strength requirement of the steel wire rope, the steel wire rope is subjected to model selection design calculation, namely, the steel wire rope can be obtained according to the formula (1):
with reference to a steel wire rope sample, the diameter of the steel wire rope is 64mm, and the effective cross section area A is 2508mm 2 Intensity level 1960N/mm 2 。
(3) When calculating the kinetic energy of the ship stall when striking the steel wire rope, consider the attached water mass coefficient lambda=0.5, and carry-in formula (2) can be obtained:
(4) According to formula (3), calculating a buffer distance of the buffer cylinder as follows:
according to the formula (5), the elastic elongation of the steel wire rope after the ship collision is calculated as follows:
according to equation (4), the ship travel distance is calculated as:
the maximum travel distance limit value of the ship is as follows:
according to formula (6), it is possible to obtain:
the design of the anti-collision device is proved to meet the requirements.
And then verifying the rationality of the design calculation method of the steel wire rope-buffer oil cylinder anti-collision device provided by the invention by combining the real-ship test result of the home dam ship lift.
The anti-collision test of the ship-receiving-chamber anti-collision device is carried out on a home dam ship lift in 2018, and the speed and momentum change, the ship buffering distance, the space change quantity of the anti-collision steel wire rope, the stroke of a buffering oil cylinder, the stress and acting condition, the stress of a ship-chamber locking mechanism and the like of the ship when the bow impacts the downstream anti-collision steel wire rope in the process of discharging the ship downstream are tested, wherein the tested ship is a 'Chuan 6' self-unloading ship, the ship length is 57.6m, the ship width is 10.8m, the draft is 2.3m, the cargo carrying speed is 700t, and the total drainage quantity is about 942t.
The real ship test is based on the progressive principle, the ship bumps the anti-collision steel wire rope at the downstream of the ship compartment for five times, the speed of the ship at each time of bumping the anti-collision rope is measured to be 0.22m/s, 0.26m/s, 0.38m/s, 0.52m/s and 0.60m/s, and the ship is effectively blocked by the anti-collision device. In the impact process, the piston rod stroke and the anti-collision rope stress change are shown in fig. 3.
The relevant parameters of the anti-collision device and the real ship test ship are shown in table 1:
TABLE 1
The above parameters are brought into formula (3), and calculated values of the buffer distances of the buffer cylinders of the test ships under different impact speeds can be obtained and are listed in table 2 together with the test values:
TABLE 2
As can be seen from Table 2, the calculated value of the buffer distance of the buffer cylinder is close to the test value and slightly larger than the test value under different ship impact speeds, and a certain safety margin is provided, so that the rationality of the design calculation method of the ship lift steel wire rope-buffer cylinder anti-collision device is demonstrated.
In summary, the invention provides a design calculation method suitable for the ship lift steel wire rope-buffer oil cylinder anti-collision device, which is reasonable, feasible and reliable through engineering example verification, aiming at the blank in the design calculation of the ship lift steel wire rope-buffer oil cylinder anti-collision device.
The foregoing is merely illustrative embodiments of the present invention, and the present invention is not limited thereto, and any changes and substitutions that may be easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (6)
1. A ship lift steel wire rope-buffer oil cylinder anti-collision device design calculation method is characterized in that: the method comprises the following steps:
according to the engineering experience of the built ship lift, providing a buffer oil cylinder type selection recommended parameter table of a buffer device corresponding to the blocking ships with different rated drainage amounts, wherein the buffer oil cylinder type selection recommended parameter table of the buffer device comprises a buffer oil cylinder pre-tightening oil pressure, a buffer oil cylinder overflow pressure, a buffer oil cylinder inner diameter and a buffer oil cylinder piston rod diameter;
selecting a steel wire rope model according to the overflow pressure of the buffer oil cylinder, the inner diameter of the buffer oil cylinder body, the diameter of a piston rod of the buffer oil cylinder and the strength requirement of the steel wire rope in a buffer oil cylinder selection recommendation parameter table of the anti-collision device, wherein the selected steel wire rope model comprises the diameter of the steel wire rope, the effective cross-sectional area of the steel wire rope and the strength grade of the steel wire rope;
calculating kinetic energy when the ship stall impacts the steel wire rope;
under the condition that the pre-tightening oil pressure of the buffer oil cylinder, the overflow pressure of the buffer oil cylinder, the inner diameter of the cylinder body of the buffer oil cylinder, the diameter of a piston rod of the buffer oil cylinder and the effective cross-section area of the steel wire rope are known, according to the energy conversion principle that the kinetic energy obtained when the ship stall is impacted on the steel wire rope is converted into the deformation energy of the steel wire rope and the heat energy of the buffer oil cylinder, the buffer distance of the buffer oil cylinder is calculated;
according to the buffer distance and the geometric relation, calculating the horizontal travelling distance of the ship, and judging whether the design of the steel wire rope-buffer oil cylinder anti-collision device meets the arrangement requirement according to the horizontal travelling distance of the ship and the maximum travelling distance limit value of the ship under the condition that the ship does not strike the ship compartment door.
2. The ship lift wire rope-buffer cylinder collision avoidance device design calculation method according to claim 1, characterized in that: the steel wire rope is selected, designed and calculated according to the requirements of the overflow pressure of the buffer oil cylinder, the inner diameter of the buffer oil cylinder body, the diameter of a piston rod of the buffer oil cylinder and the strength of the steel wire rope in the buffer oil cylinder selection recommendation parameter table of the anti-collision device, and specifically comprises the following steps:
wherein S is b For minimum breaking force of steel wire rope, p e The overflow pressure of the oil cylinder is buffered; d (D) ci The inner diameter of the cylinder body of the buffer oil cylinder is the inner diameter of the cylinder body of the buffer oil cylinder; d, d p And selecting the type of the steel wire rope by combining the steel wire rope product sample for buffering the diameter of the piston rod of the oil cylinder.
3. The ship lift wire rope-buffer cylinder collision avoidance device design calculation method according to claim 1, characterized in that: the calculation of the kinetic energy of the ship when stalling hits the wire rope takes into account the influence of the attached water quality:
wherein E is s Kinetic energy when the ship stalls and impacts the steel wire rope; m is M c Is the total mass of the ship and is equal to the rated displacement of the ship in value; v is the maximum allowable speed of the ship entering the compartment; lambda is the attached water quality coefficient.
4. The ship lift wire rope-buffer cylinder collision avoidance device design calculation method according to claim 1, characterized in that: the buffer distance of the buffer oil cylinder is calculated, and the specific formula is as follows:
wherein d cp For buffering the oil cylinder buffer distance E s For kinetic energy when the ship stall hits the steel wire rope, D ci The inner diameter of the cylinder body of the buffer oil cylinder is the inner diameter of the cylinder body of the buffer oil cylinder; d, d p The diameter of a piston rod of the buffer oil cylinder is; p is p e The overflow pressure of the oil cylinder is buffered; p is p 0 Pre-tightening oil pressure for the buffer oil cylinder; a is the effective cross-sectional area of the steel wire rope; l is the distance between steel wire rope fulcrums; e is the elastic modulus of the steel wire rope.
5. The ship lift wire rope-buffer cylinder collision avoidance device design calculation method according to claim 4, wherein the ship lift wire rope-buffer cylinder collision avoidance device design calculation method is characterized in that: according to the buffer distance and the geometric relationship, calculating the horizontal travelling distance of the ship, wherein the specific formula is as follows:
wherein, I sh Is the horizontal travel distance of the ship; d, d cp The buffer distance is the buffer distance of the buffer oil cylinder; delta is the elastic elongation of the steel wire rope after the ship collision, and is determined according to the formula (5); beta is the bow inclination angle of the ship; l is the distance between steel wire rope fulcrums;
6. the ship lift wire rope-buffer cylinder collision avoidance device design calculation method according to claim 1 or 5, characterized in that: judging whether the design of the steel wire rope-buffer oil cylinder anti-collision device meets the arrangement requirement according to the horizontal travelling distance of the ship and the maximum travelling distance limit value of the ship under the condition that the ship does not strike a cabin door, wherein the method specifically comprises the following steps:
wherein, I sh Is the horizontal travel distance of the ship; d, d gc The distance from the ship compartment door to the blocking steel wire rope is set; delta h The vertical distance between the top of the compartment door and the blocking steel wire rope;
if the formula (6) is established, the design of the steel wire rope-buffer oil cylinder anti-collision device is proved to meet the arrangement requirement; if the formula (6) is not established, the parameters of the buffer oil cylinder are required to be adjusted, and rechecking is performed again.
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| CN116204991B (en) | 2023-07-11 |
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