CN213768903U

CN213768903U - Telescopic ladder for climbing

Info

Publication number: CN213768903U
Application number: CN202023014886.5U
Authority: CN
Inventors: 马相; 仓杰; 邵旭; 井玉亮; 王秋翥; 蔡烨; 马昊泽
Original assignee: Shanghai Ouyang Ocean Engineering Co ltd
Current assignee: Shanghai Ouyang Ocean Engineering Co ltd
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-07-23
Anticipated expiration: 2030-12-15

Abstract

The utility model discloses a telescopic ladder of taking advantage of that steps on, including L type mounting panel, winch device is installed to the one end at L type mounting panel top, fixed eye plate is installed to the other end at L type mounting panel top, the connecting plate is installed to the both ends symmetry at L type mounting panel outside top, and the inboard of two sets of connecting plates articulates jointly has the upper portion ladder, one side that winch device was kept away from to the upper portion ladder is provided with the middle part ladder, one side that the upper portion ladder was kept away from to the middle part ladder is provided with the lower part ladder. The utility model discloses a cooperation of upper portion ladder, middle part ladder, lower part ladder, wire rope, pulley gear, second wire wheel, first wire wheel and sliding tray is used, and the vertical interval that realizes between offshore platform and the cargo ship can be in arbitrary suitable within range, and the personnel on the cargo ship of all can being convenient for are through stepping on the offshore platform of taking advantage of the ladder, need not be again through the height at decline adjustment offshore platform place, have improved this telescopic functional and the practicality of stepping on the ladder greatly.

Description

Telescopic ladder for climbing

Technical Field

The utility model relates to a step on and take advantage of ladder technical field, specifically be telescopic step on and take advantage of ladder.

Background

At present, a self-elevating offshore operation platform is higher than the water surface during operation, if the self-elevating offshore operation platform is directly climbed through a suspension rope, the self-elevating offshore operation platform is very inconvenient, and sea storms are large, so that safety boarding of personnel is not facilitated, and therefore a corresponding telescopic boarding ladder is required to be used so that the boarding personnel can safely and quickly board or evacuate.

The length of the boarding ladder on the current self-elevating offshore operation platform is usually fixed, when the distance height between a cargo ship splint and an offshore platform is larger than the length of the boarding ladder, the height of the whole offshore platform is usually required to be reduced so as to be convenient for personnel on the cargo ship to board the offshore platform, and if someone accidentally falls into water, the boarding ladder with insufficient length often makes it difficult for a water-falling person to board the offshore platform again through the boarding ladder, and the length of the boarding ladder cannot be freely adjusted according to actual needs, so that the practicability and functionality of the boarding ladder are reduced; the existing boarding ladder on the self-elevating offshore operation platform is usually vertically arranged on one side of the offshore platform, personnel on a cargo ship need to be very close to the offshore platform through the boarding ladder in a vertical state, and the climbing ladder is very labor-consuming and low in safety, once wave fluctuation occurs, the cargo ship is very easy to collide with the offshore platform and is very unsafe, the inclination angle of the boarding ladder cannot be freely adjusted, and the distance between the offshore platform and the cargo ship is controlled, so that the application range of the boarding ladder is greatly reduced; meanwhile, the climbing ladder used on the current self-elevating offshore operation platform needs manpower to be extended, the functionality of the climbing ladder is low, and the application range is very limited.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a telescopic ladder of taking advantage of that climbs to solve the relevant problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the telescopic climbing ladder comprises an L-shaped mounting plate, a winch device is mounted at one end of the top of the L-shaped mounting plate, a fixing eye plate is mounted at the other end of the top of the L-shaped mounting plate, connecting plates are symmetrically mounted at two ends of the top of the outer side of the L-shaped mounting plate, an upper ladder is hinged to the inner sides of the two groups of connecting plates together, a middle ladder is arranged at one side of the upper ladder away from the winch device, a lower ladder is arranged at one side of the middle ladder away from the upper ladder, sliding grooves are symmetrically formed in two ends of the lower ladder and the middle ladder, two groups of side plates are symmetrically mounted at two ends of the bottom of one side of the upper ladder and the middle ladder away from the winch device, guide wheels matched with the sliding grooves are mounted at the inner sides of the side plates, electric pneumatic cylinders are symmetrically hinged to the bottoms of the two ends of the outer side of the L-shaped mounting plate, and output ends of the two groups of electric pneumatic cylinders are hinged to two ends of one side of the upper ladder close to the winch device, the middle position department of middle part ladder and lower part ladder bottom all installs spacing layer board, pulley gear is installed to the both ends symmetry of lower part ladder bottom, the output of winch device is provided with wire rope, and the one end that wire rope kept away from the winch device behind two sets of pulley gear with the inboard fixed connection of fixed eye board.

Preferably, the top of the two ends of the lower ladder is symmetrically provided with mounting blocks, one side of each mounting block, which is close to the winch device, is provided with a second U-shaped frame, and the inner side of each second U-shaped frame is provided with two groups of second wire guide wheels which are matched with the steel wire rope.

Preferably, first U-shaped frames are symmetrically arranged on one sides, far away from the winch device, of the tops of the two groups of connecting plates, and first wire guide wheels matched with the steel wire ropes are arranged on the tops of the inner sides of the two groups of first U-shaped frames.

Preferably, the middle position department at L type mounting panel top installs the antiskid backing plate, and the both ends symmetry at antiskid backing plate top install supplementary handrail.

Preferably, the stopper is installed at the inboard top of sliding tray, and the bottom of stopper installs two sets of buffer spring, and is two sets of buffer spring's bottom is installed jointly and is mutually supported's activity slider with the sliding tray.

Preferably, four groups of fixing holes are symmetrically formed in the two ends of the top of the L-shaped mounting plate, fixing bolts are arranged on the inner sides of the fixing holes, and the L-shaped mounting plate is fixedly connected with the edge position of a ship deck through the fixing holes and the fixing bolts.

Preferably, vertical handrails are symmetrically installed at the tops of two ends of the upper ladder, and rubber anti-slip sleeves are arranged on the outer sides of the two groups of vertical handrails.

Preferably, the bottom of the inner side of the sliding groove is provided with an anti-falling block matched with the guide wheel, and the top of the anti-falling block is provided with an anti-collision pad.

Preferably, the inboard one end of being close to the upper portion ladder of connecting plate is provided with the articulated shaft, the articulated shaft comprises bearing and pivot jointly, the inboard position department of being close to the upper portion ladder of connecting plate installs the bearing, and the inboard of bearing install with upper portion ladder fixed connection's pivot.

Preferably, the using method of the telescopic boarding ladder comprises the following steps:

when personnel need to be connected from the shore or a small ship to get on the ship, an operator stands beside the ship and controls the winch device to gradually lengthen the steel wire rope through a control panel outside the winch device, at the moment, the lower ladder and the middle ladder gradually descend under the influence of gravity, and the guide wheels roll in the sliding groove in the process.

And step two, when the bottom end of the lower ladder is very close to the bank or a boat, controlling the winch device to stop lengthening the steel wire rope, and at the moment, the lower ladder and the middle ladder do not continuously descend any more, and in the whole process, the upper ladder, the middle ladder and the lower ladder are gradually unfolded and gradually approach to each other end to end.

And step three, if the personnel on the shore or the boat inconveniently crawl the lower ladder in the vertical state, the two sets of electric pneumatic cylinders are controlled to extend gradually before the lower ladder and the middle ladder descend, so that the upper ladder is gradually inclined from the original vertical state, the middle ladder and the lower ladder can also follow the inclination, and then the winch device is controlled to lengthen the steel wire rope, so that the lower ladder and the middle ladder slowly descend.

Step four, when the personnel climb the top of the upper ladder and the middle ladder in sequence, the personnel who go to the ship can hold the vertical handrail with both hands and continue to climb to the topmost part of the upper ladder, then step on the anti-slip backing plate at the top of the L-shaped mounting plate, both hands hold the auxiliary handrail on the anti-slip backing plate immediately, until the personnel completely walk onto the clamping plate of the ship, after the personnel all go to the ship, the winch device is controlled to begin to recover the steel wire rope, until the limiting support plate at the bottom of the lower ladder supports on the limiting support plate at the bottom of the middle ladder, and the limiting support plate at the bottom of the middle ladder supports at the bottom of the upper ladder, finally, the original state is shortened through controlling the electric pneumatic cylinder, so that the upper ladder, the middle ladder and the lower ladder are in a vertical state, and the folding recovery of the telescopic boarding ladder is completed.

Compared with the prior art, the utility model provides a telescopic ladder of taking advantage of that steps on possesses following beneficial effect:

1. the utility model controls the winch device to lengthen the steel wire rope according to the height between the boarding personnel and the offshore platform through the matching use of the upper ladder, the middle ladder, the lower ladder, the steel wire rope, the pulley device, the buffer spring, the winch device, the side plate, the fixed eye plate, the L-shaped mounting plate, the limiting support plate, the guide wheel, the connecting plate, the first U-shaped frame, the mounting block, the second U-shaped frame, the limiting block, the second wire wheel, the first wire wheel and the sliding groove, at the moment, the winch device is controlled to stop lengthening the steel wire rope until the bottom of the lower ladder descends gradually under the influence of gravity until the boarding personnel climb conveniently, then the boarding personnel can climb on the deck of the offshore platform after passing through the lower ladder, the middle ladder and the upper ladder in sequence, thereby being very convenient and realizing that the vertical distance between the offshore platform and the cargo ship can be in any proper range, personnel on the cargo ship can conveniently climb up the offshore platform by climbing the ladder without descending to adjust the height of the offshore platform, so that the functionality and the practicability of the telescopic ladder are greatly improved.

2. The utility model discloses an upper portion ladder, L type mounting panel, electric pneumatic cylinder, the cooperation of connecting plate and articulated shaft is used, can be when cargo ship and offshore platform are in safe distance, cooperate foretell elevation structure, can utilize the inclination of electric pneumatic cylinder control upper portion ladder, thereby together control the inclination of upper portion ladder, the inclination of middle part ladder and lower part ladder, make stretching to different angles that the bottom of lower part ladder can be accurate, even have certain distance between cargo ship and the offshore platform, also can let the personnel on the cargo ship be safe light should climb the ladder and climb the offshore platform through climbing, the practicality and the safety in utilization of this telescopic ladder of ascending a passenger are greatly improved.

3. The utility model discloses an above-mentioned extending structure and angle modulation structure's cooperation is used, through a small amount of parts alright with realize freely adjusting the length and the inclination of taking advantage of the ladder, neither need the manpower adjustment to step on the length and the inclination of taking advantage of the ladder, also very big not personnel on the different positions department cargo ship of being convenient for step on still offshore platform, have improved this telescopic practicality of taking advantage of the ladder of stepping on, are favorable to this telescopic popularization and use of taking advantage of the ladder of stepping on.

Drawings

Fig. 1 is a front view of the extended state of the ascending and taking ladder of the present invention;

fig. 2 is a side view of the utility model in an extended state;

fig. 3 is a side view of the shortened state of the ascending and taking ladder of the present invention;

fig. 4 is a schematic side view of the shortened state of the ascending and riding ladder of the present invention;

fig. 5 is a top sectional view of the boarding ladder of the present invention;

FIG. 6 is an enlarged view of the point A of FIG. 4 according to the present invention;

fig. 7 is an enlarged view of fig. 5B according to the present invention.

In the figure: 1. an upper ladder; 2. a middle ladder; 3. a lower ladder; 4. a wire rope; 5. a pulley device; 6. a buffer spring; 7. a vertical armrest; 8. a winch arrangement; 9. a side plate; 10. fixing the eye plate; 11. an L-shaped mounting plate; 12. an electric pneumatic cylinder; 13. a limiting supporting plate; 14. a guide wheel; 15. a connecting plate; 16. a first U-shaped frame; 17. mounting blocks; 18. a second U-shaped frame; 19. a movable slide block; 20. a limiting block; 21. a second wire guide wheel; 22. a first wire guide wheel; 23. hinging a shaft; 24. a sliding groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example one

Referring to fig. 1-7, the present invention provides a technical solution: the telescopic climbing ladder comprises an L-shaped mounting plate 11, a winch device 8 is mounted at one end of the top of the L-shaped mounting plate 11, a fixing eye plate 10 is mounted at the other end of the top of the L-shaped mounting plate 11, connecting plates 15 are symmetrically mounted at two ends of the top of the outer side of the L-shaped mounting plate 11, an upper ladder 1 is hinged to the inner sides of the two groups of connecting plates 15 together, a middle ladder 2 is arranged at one side of the upper ladder 1 away from the winch device 8, a lower ladder 3 is arranged at one side of the middle ladder 2 away from the upper ladder 1, sliding grooves 24 are symmetrically formed at two ends of the lower ladder 3 and the middle ladder 2, two groups of side plates 9 are symmetrically mounted at two ends of the bottom of one side of the upper ladder 1 and the middle ladder 2 away from the winch device 8, guide wheels 14 matched with the sliding grooves 24 are mounted at the inner sides of the side plates 9, electric pneumatic cylinders 12 are hinged to the bottoms of two ends of the outer side of the L-shaped mounting plate 11 symmetrically, and output ends of the two groups of the electric pneumatic cylinders 12 are hinged to two ends of one side of the upper ladder 1 close to the winch device 8 respectively, the middle positions of the bottoms of the middle ladder 2 and the lower ladder 3 are respectively provided with a limiting supporting plate 13, the two ends of the bottom of the lower ladder 3 are symmetrically provided with pulley devices 5, the output end of a winch device 8 is provided with a steel wire rope 4, and one end, far away from the winch device 8, of the steel wire rope 4 is fixedly connected with the inner side of a fixed eye plate 10 after passing through the two groups of pulley devices 5.

As a preferable embodiment of the present embodiment: the top symmetry at lower part ladder 3 both ends is installed and is installed installation piece 17, and the installation piece 17 is close to one side of winch device 8 and installs second U type frame 18, and two sets of second wire wheels 21 of mutually supporting with wire rope 4 are installed to the inboard of second U type frame 18, help improving the stability of wire rope 4 drive lower part ladder 3 lift in-process.

As a preferable embodiment of the present embodiment: first U-shaped frame 16 is installed to two sets of connecting plate 15 tops one side symmetry of keeping away from winch device 8, and the inboard top of two sets of first U-shaped frame 16 is provided with the first wire wheel 22 of mutually supporting with wire rope 4, helps in adjusting the back of inclination in lower part ladder 3, and wire rope 4 still can be stable drive lower part ladder 3 go up and down.

As a preferable embodiment of the present embodiment: stopper 20 is installed at the inboard top of sliding tray 24, and two sets of buffer spring 6 are installed to stopper 20's bottom, and the bottom of two sets of buffer spring 6 is installed jointly and is mutually supported activity slider 19 with sliding tray 24, helps when lower part ladder 3 and middle part ladder 2 descend too fast, cushions the power that the leading wheel 14 collided on activity slider 19, also restricts the height that lower part ladder 3 and middle part ladder 2 descend simultaneously.

Example two

As a preferable embodiment of the present embodiment: an anti-skid base plate is arranged in the middle of the top of the L-shaped mounting plate 11, and auxiliary handrails are symmetrically arranged at two ends of the top of the anti-skid base plate, so that a person climbing a ship can conveniently hold the auxiliary handrails to walk to a ship deck after climbing the top of the upper ladder 1.

As a preferable embodiment of the present embodiment: four groups of fixing holes are symmetrically formed in two ends of the top of the L-shaped mounting plate 11, fixing bolts are arranged on the inner sides of the fixing holes, and the L-shaped mounting plate 11 is fixedly connected with the edge position of a ship deck through the fixing holes and the fixing bolts, so that the L-shaped mounting plate 11 can be stably mounted on the deck of a ship.

As a preferable embodiment of the present embodiment: vertical handrails 7 are symmetrically installed at the tops of two ends of the upper ladder 1, and rubber anti-skidding sleeves are arranged on the outer sides of the two groups of vertical handrails 7, so that boarding personnel can safely crawl.

As a preferable embodiment of the present embodiment: the anticreep piece of mutually supporting with leading wheel 14 is installed to the inboard bottom of sliding tray 24, and the top of anticreep piece sets up the crash pad, helps restricting the height that lower part ladder 3 and middle part ladder 2 rise.

As a preferable embodiment of the present embodiment: one end that the inboard of connecting plate 15 is close to upper portion ladder 1 is provided with articulated shaft 23, and articulated shaft 23 comprises bearing and pivot jointly, and the inboard position department that is close to upper portion ladder 1 of connecting plate 15 installs the bearing, and the inboard of bearing install with upper portion ladder 1 fixed connection's pivot, and the upper portion ladder 1 of being convenient for can use articulated shaft 23 to rotate as the axle center to change the inclination of upper portion ladder 1.

The using method of the telescopic boarding ladder comprises the following steps:

step one, when needing to connect personnel to get on the boat from a shore or a small boat, an operator stands beside the boat, controls the winch device 8 to gradually lengthen the steel wire rope 4 through a control panel outside the winch device 8, at the moment, the lower ladder 3 and the middle ladder 2 gradually descend under the influence of gravity, and the guide wheel 14 rolls in the sliding groove 24 in the process.

And step two, when the bottom end of the lower ladder 3 is very close to the bank or a boat, controlling the winch device 8 to stop lengthening the steel wire rope 4, and at the moment, the lower ladder 3 and the middle ladder 2 do not continuously descend any more, and in the whole process, the upper ladder 1, the middle ladder 2 and the lower ladder 3 are gradually unfolded and gradually close to each other end to end.

Step three, if the personnel on the bank or the boat are inconvenient to crawl the lower ladder 3 in the vertical state, two sets of electric pneumatic cylinders 12 are controlled to extend gradually before the lower ladder 3 and the middle ladder 2 descend, so that the upper ladder 1 is inclined gradually from the original vertical state, the middle ladder 2 and the lower ladder 3 can also follow the inclination, and then the winch device 8 is controlled to lengthen the steel wire rope 4, so that the lower ladder 3 and the middle ladder 2 slowly descend.

Step four, when the personnel climb the lower ladder 3 and the middle ladder 2 in sequence to reach the top of the upper ladder 1, the personnel on board can hold the vertical handrail 7 with both hands to continue to climb to the topmost part of the upper ladder 1, then step on the antiskid backing plate at the top of the L-shaped mounting plate 11 with feet, hold the auxiliary handrail on the antiskid backing plate with both hands, until the personnel completely walk onto the clamping plate of the large ship, after the personnel are all on board, the winch device 8 is controlled to start to recover the steel wire rope 4, until the limiting backing plate 13 at the bottom of the lower ladder 3 abuts against the limiting backing plate 13 at the bottom of the middle ladder 2, and the limiting backing plate 13 at the bottom of the middle ladder 2 abuts against the bottom of the upper ladder 1, and finally the original state is shortened by controlling the electric pneumatic cylinder 12, so that the upper ladder 1, the middle ladder 2 and the lower ladder 3 are in the vertical state, and the folding recovery of the telescopic ladder is completed.

The working principle is as follows: before the device is used, an operator stands beside a ship, and controls a winch device 8 to gradually lengthen a steel wire rope 4 through a control panel outside the winch device 8, at the moment, a lower ladder 3 and a middle ladder 2 lose upward force given by the steel wire rope 4, the lower ladder 3 and the middle ladder 2 gradually descend under the influence of gravity, a guide wheel 14 rolls in a sliding groove 24 in the process, when the bottom end of the lower ladder 3 is very close to the shore or a boat, the winch device 8 is controlled to stop lengthening the steel wire rope 4, at the moment, the lower ladder 3 is subjected to upward force given by the steel wire rope 4 and a pulley device 5 and does not continuously descend, in the whole process, the upper ladder 1, the middle ladder 2 and the lower ladder 3 gradually expand and gradually approach to each other end to end, if the lower ladder 3 is in a shore or a boat, the personnel on the shore or the boat cannot conveniently climb the vertical state, and two groups of electric pneumatic cylinders 12 can be controlled to gradually extend before the lower ladder 3 and the middle ladder 2 descend, so that the upper ladder 1 is inclined gradually from the original vertical state, the middle ladder 2 and the lower ladder 3 are also inclined along with the inclination, then the winch device 8 is controlled to lengthen the steel wire rope 4, so that the lower ladder 3 and the middle ladder 2 are slowly descended, a person can climb onto the large ship through the upper ladder 1, the middle ladder 2 and the lower ladder 3 conveniently, when the person sequentially climbs the lower ladder 3 and the middle ladder 2 to reach the top of the upper ladder 1, the person on the ship can hold the vertical handrail 7 with both hands to continue climbing to the topmost part of the upper ladder 1, then step on the anti-skid liner plate at the top of the L-shaped mounting plate 11, hold the auxiliary handrail on the anti-skid liner plate with both hands until the person completely walks onto the clamping plate of the large ship, after all the persons are on the ship, the original state is shortened by controlling the electric pneumatic cylinder 12, so that the upper ladder 1, the middle ladder 2 and the lower ladder 3 are in the vertical state, and finally the winch device 8 is controlled to start to recover the steel wire rope 4, through wire rope 4 and pulley gear 5's cooperation, promote lower part ladder 3 and middle part ladder 2 one by one, support on the spacing layer board 13 of middle part ladder 2 bottoms to the spacing layer board 13 of lower part ladder 3 bottoms, and the spacing layer board 13 of middle part ladder 2 bottoms supports the bottom at upper portion ladder 1, accomplishes the telescopic folding recovery of riding the ladder of stepping on.

It should be finally noted that the above only serves to illustrate the technical solution of the present invention, and not to limit the scope of the present invention, and that simple modifications or equivalent replacements performed by those skilled in the art to the technical solution of the present invention do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. Telescopic ladder of taking advantage of, including L type mounting panel (11), its characterized in that: the winch device (8) is installed at one end of the top of the L-shaped mounting plate (11), the fixing eye plate (10) is installed at the other end of the top of the L-shaped mounting plate (11), the connecting plates (15) are symmetrically installed at two ends of the top of the outer side of the L-shaped mounting plate (11), the inner sides of the two groups of connecting plates (15) are hinged to the upper ladder (1) together, the middle ladder (2) is arranged on one side, away from the winch device (8), of the upper ladder (1), the lower ladder (3) is arranged on one side, away from the upper ladder (1), of the middle ladder (2), the sliding grooves (24) are symmetrically formed in two ends of the lower ladder (3) and the middle ladder (2), the two groups of side plates (9) are symmetrically installed at two ends, away from the bottom of one side of the winch device (8), of the upper ladder (1) and the middle ladder (2), and guide wheels (14) matched with the sliding grooves (24) are installed on the inner sides of the side plates (9), the bottom symmetry at L type mounting panel (11) outside both ends articulates there are electric pneumatic cylinder (12), and the output of two sets of electric pneumatic cylinder (12) is articulated with the both ends that upper portion ladder (1) is close to winch device (8) one side respectively, intermediate position department of middle part ladder (2) and lower part ladder (3) bottom all installs spacing layer board (13), pulley gear (5) are installed to the both ends symmetry of lower part ladder (3) bottom, the output of winch device (8) is provided with wire rope (4), and wire rope (4) keep away from the inboard fixed connection of one end behind two sets of pulley gear (5) and fixed eye plate (10) of winch device (8).

2. The telescopic boarding ladder of claim 1, characterized in that: the top at both ends of the lower ladder (3) is symmetrically provided with mounting blocks (17), one side of each mounting block (17) close to the winch device (8) is provided with a second U-shaped frame (18), and the inner side of each second U-shaped frame (18) is provided with two groups of second guide wheels (21) which are matched with the steel wire rope (4).

3. The telescopic boarding ladder of claim 1, characterized in that: first U-shaped frames (16) are symmetrically arranged on one sides, far away from the winch device (8), of the tops of the two groups of connecting plates (15), and first guide wheels (22) matched with the steel wire ropes (4) are arranged on the tops of the inner sides of the two groups of first U-shaped frames (16).

4. The telescopic boarding ladder of claim 1, characterized in that: the middle position department at L type mounting panel (11) top installs anti-skidding backing plate, and the both ends symmetry at anti-skidding backing plate top installs supplementary handrail.

5. The telescopic boarding ladder of claim 1, characterized in that: stopper (20) are installed at the top of sliding tray (24) inboard, and two sets of buffer spring (6) are installed to the bottom of stopper (20), and are two sets of buffer spring (6)'s bottom is installed jointly and is mutually supported movable slider (19) with sliding tray (24).

6. The telescopic boarding ladder of claim 1, characterized in that: four groups of fixing holes are symmetrically formed in two ends of the top of the L-shaped mounting plate (11), fixing bolts are arranged on the inner sides of the fixing holes, and the L-shaped mounting plate (11) is fixedly connected with the edge position of a ship deck through the fixing holes and the fixing bolts.

7. The telescopic boarding ladder of claim 1, characterized in that: vertical handrails (7) are symmetrically installed at the tops of two ends of the upper ladder (1), and rubber anti-skidding sleeves are arranged on the outer sides of the two groups of vertical handrails (7).

8. The telescopic boarding ladder of claim 1, characterized in that: the bottom of sliding tray (24) inboard is installed and is mutually supported with leading wheel (14) anticreep piece, and the top of anticreep piece sets up the crash pad.

9. The telescopic boarding ladder of claim 1, characterized in that: one end that connecting plate (15) inboard is close to upper portion ladder (1) is provided with articulated shaft (23), articulated shaft (23) comprise bearing and pivot jointly, the inboard position department of being close to upper portion ladder (1) of connecting plate (15) installs the bearing, and the inboard of bearing install with upper portion ladder (1) fixed connection's pivot.