Safe mast structure and method of use

Abstract

The application discloses a ship mast structure with good safety and a use method, which comprises a lower mast seat arranged on a ship deck, a lower mast arranged on the lower mast seat, a upper mast seat arranged on the upper end of the lower mast, a upper mast arranged on the upper mast seat, two fixed pulleys arranged on the front part of the ship deck, and a rope arranged on the fixed pulleys; the lower mast seat and the upper mast seat are both in U shape with an upward opening; the lower part of the lower mast is rotationally connected with the lower mast seat through a lower mast seat rotating shaft; the lower part of the upper mast is rotationally connected with the upper mast seat through an upper mast seat rotating shaft; the lower mast below the lower mast seat rotating shaft is fixedly connected with the lower mast seat through a lower mast fixing bolt; the upper mast can be slowly and self-adaptively adjusted to a backward dumping angle after being collided, so that the upper mast can be separated from the obstacle as soon as possible, the collision force is effectively buffered and reduced, and the loss caused by the collision is reduced.

Description

Technical Field

[0001] This invention relates to the field of mast technology, and in particular to a safe ship mast structure and its usage method. Background Technology

[0002] When a ship is sailing, a collision between the mast and a bridge or other object can cause significant damage due to unforeseen factors or negligence.

[0003] Furthermore, in order to maintain the mast, it needs to be easy to lower. However, in the existing technology, when the mast is hit or needs to be lowered, it can only be quickly lowered onto the deck. Since the speed and gravity of the mast when it falls are relatively large, it is very easy to cause accidents or damage to the mast or other items. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of ship masts, such as the significant damage caused by collisions with other objects and the high risk of accidents when quickly lowered, and to provide a safe ship mast structure and method of use.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A safe and secure ship mast structure includes a lower mast seat on the ship's deck, a lower mast on the lower mast seat, an upper mast seat at the upper end of the lower mast, an upper mast on the upper mast seat, two fixed pulleys at the front of the ship's deck, and ropes on the fixed pulleys. Both the lower mast seat and the upper mast seat are U-shaped with upward openings. The lower part of the lower mast is rotatably connected to the lower mast seat via a lower mast seat pivot, and the lower part of the upper mast is rotatably connected to the upper mast seat via an upper mast seat pivot. The lower mast below the lower mast seat pivot is fixedly connected to the lower mast seat via a lower mast fixing bolt, and the upper mast below the upper mast seat pivot is fixedly connected to the upper mast seat via an upper mast fixing bolt. Both ropes are connected to the upper part of the upper mast. The front side of the upper mast is provided with a vertically extending roller groove, in which a plurality of rollers are arranged at intervals.

[0007] In the initial state, both the upper mast and the lower mast are vertical. The lower mast is fixedly connected to the lower mast base by the lower mast fixing bolts; the upper mast is fixedly connected to the upper mast base by the upper mast fixing bolts.

[0008] As the ship moves forward, when the main mast collides with an obstacle, each roller will first contact the obstacle. The staff will then loosen the main mast fixing bolts so that the main mast fixing bolts are located on the main mast seat and detach from the main mast.

[0009] The two ropes are used to pull the upper part of the mast, and as the ship moves forward, the mast slowly tilts backward, and the rollers roll relative to the obstacle.

[0010] Once the upper mast is detached from the obstacle, the workers use two ropes to pull the upper mast into a vertical position and tighten the upper mast fixing bolts to secure the upper mast to the upper mast base.

[0011] Each roller cushions the impact force, effectively reducing damage caused by the collision; the upper mast can rotate, facilitating its rapid evacuation from obstacles; the tension of the ropes allows the upper mast to tilt slowly, reducing the risk of accidents.

[0012] Preferably, the upper mast base is provided with two symmetrical upper tilting plates, each upper tilting plate being fan-shaped with a central angle of 90°. Each upper tilting plate has an upper arc-shaped hole, the lower edge of which includes several upper tilting steps. The upper mast is provided with a vertically extending upper mast movable groove, and the two ends of the upper mast movable shaft located in the upper mast movable groove extend into the two upper arc-shaped holes respectively. The left and right sides of the upper mast on the upper side of the upper mast base are respectively provided with two upper mast tension springs, the upper ends of which are connected to the lower surfaces of the left and right sides of the upper mast movable shaft respectively.

[0013] The outer side of the upper slow-reverse plate is provided with an upper mast reset slide plate that matches the shape of the upper arc-shaped hole. The upper mast reset slide plate is rotatably connected to the lower rear part of the upper slow-reverse plate via an upper mast slide plate pivot. The upper part of the upper mast reset slide plate is provided with an upper mast release pivot plate located inside the upper mast reset slide plate. The rear part of the upper mast release pivot plate is rotatably connected to the upper mast reset slide plate via an upper mast pivot plate pivot. The lower front part of the upper mast reset slide plate is provided with an upper mast compression spring base support. The upper end of the upper mast compression spring on the upper mast compression spring base support is connected to the upper front edge of the upper mast release pivot plate. The upper front part of the upper mast reset slide plate is provided with an upper mast compression spring avoidance... The opening is provided; the outer side of the upper mast release plate is perpendicular to the ground, and the thickness of the upper mast release plate gradually decreases from top to bottom; the upper mast release plate is provided with an upper mast buckle, and the upper mast reset plate is provided with an upper mast slot on the upper edge, into which the upper mast buckle can enter; a baffle is provided at the outer end of the upper mast slide shaft, and an upper mast shaft compression spring is provided on the upper mast slide shaft inside the baffle to push the upper mast reset plate onto the upper release plate; an upper hook plate is provided at the lower rear corner of the upper mast reset plate, which is located behind the upper release step at the bottom of the upper arc-shaped hole.

[0014] When the mast collides with the obstacle, each roller contacts the obstacle, and the mast slowly tilts backward, with each roller rolling relative to the obstacle. During the backward tilting of the mast, the mast's movable shaft is pushed to the next upper gentle-falling step of the two upper arc-shaped holes, and then the two mast tension springs pull the mast's movable shaft down.

[0015] As the ship continues to move forward and the upper mast has not yet disengaged from the obstacle, the upper mast continues to tilt backward under the resistance of the obstacle, and the upper mast's movable shaft continues to move to the next gentle upward step and slide down.

[0016] After the mast is detached from the obstacle, if the position of the mast's movable shaft is in the middle of the two upper arc-shaped holes, the worker pulls the rope backward and downward, causing the mast's movable shaft to slide down to the bottom of the rear side of the upper gentle-falling step at the lowest point of the two upper arc-shaped holes. This causes the mast's movable shaft to press down on the two upper hook plates, causing the two mast reset slides to rotate clockwise along the corresponding mast slide shafts. The two mast shaft compression springs push the two mast reset slides against the corresponding upper gentle-falling plates, and the two mast buckles enter the two mast slots. The two mast reset slides enter the two upper arc-shaped holes, and the arc-shaped upper edges of the two mast reset slides block the upper gentle-falling steps of the two upper arc-shaped holes.

[0017] After the mast is detached from the obstacle, if the mast's movable shaft is at the bottom of the two upper arc-shaped holes, the mast's movable shaft will automatically press down the two upper hook plates, causing the two mast reset slides to rotate clockwise along the two mast slide shafts. The two mast shaft compression springs will push the two mast reset slides towards the corresponding upper slow-falling plates. The two mast buckles will enter the two mast slots, and the two mast reset slides will enter the two upper arc-shaped holes. The arc-shaped upper edges of the two mast reset slides will block the upper slow-falling steps of the two upper arc-shaped holes.

[0018] After the mainmast is freed from the obstacle, the workers can rotate two fixed pulleys to pull the mainmast forward with two ropes. This causes the mainmast to rotate along the mainmast base pivot and rise upward. The mainmast movable shaft then rises along the upper edge of the upper arc-shaped sliding plate and the upper edge of the upper arc-shaped hole to the top of the two upper arc-shaped holes. The mainmast movable shaft presses the two mainmast release plates downward. As the two mainmast release plates move downward, they push the two mainmast release plates out of the two upper arc-shaped holes, causing the two mainmast latches to disengage from the two mainmast latch slots. The left side of both mainmast release plates falls due to their own weight until they contact the mainmast base. The left side of the two mainmast release plates then stops falling, and under the action of the mainmast compression spring, both mainmast release plates automatically reset. This restores the mainmast to a vertical position, allowing the ship to return to a normal sailing state as quickly as possible.

[0019] Therefore, after being impacted, the mast of the present invention can slowly tilt backward, adaptively adjusting the angle of backward tilt, so that the mast can quickly get away from the obstacle, effectively buffering and reducing the impact force, and reducing the damage caused by the collision; the mast can tilt backward slowly, making it less likely to cause an accident, and the mast is not easily damaged.

[0020] Preferably, the upper end of the lower mast base is provided with two symmetrically placed lower tilting plates, each of which is fan-shaped with a central angle of 90°. Each lower tilting plate has a lower arc-shaped hole, the lower edge of which includes several lower tilting steps. The lower mast is provided with a vertically extending lower mast movable groove, and the two ends of the lower mast movable shaft located in the lower mast movable groove extend into the two lower arc-shaped holes respectively. The left and right sides of the lower mast on the upper side of the lower mast base are respectively provided with two lower mast tension springs, the upper ends of which are connected to the lower surfaces of the left and right parts of the lower mast movable shaft respectively.

[0021] The outer side of the lower tilting plate is provided with a lower mast reset slide plate that matches the lower arc-shaped hole. The lower mast reset slide plate is rotatably connected to the lower part of the lower tilting plate via a lower mast slide plate pivot. The upper part of the lower mast reset slide plate is provided with a lower mast release pivot plate located inside the lower mast reset slide plate. The rear part of the lower mast release pivot plate is rotatably connected to the lower mast reset slide plate via a lower mast pivot plate pivot. The lower front part of the lower mast reset slide plate is provided with a lower mast compression spring base support. The upper end of the lower mast compression spring on the lower mast compression spring base support is connected to the upper front edge of the lower mast release pivot plate. The upper front part of the lower mast reset slide plate is provided with a lower mast compression spring clearance opening. The outer side of the lower mast release plate is perpendicular to the ground, and the thickness of the lower mast release plate gradually decreases from top to bottom; the lower mast release plate is equipped with a lower mast buckle, and the upper edge of the lower mast reset plate is equipped with a lower mast slot, into which the lower mast buckle can enter; the outer end of the lower mast slide shaft is equipped with a baffle, and the lower mast slide shaft inside the baffle is equipped with a lower mast shaft compression spring for squeezing the lower mast reset plate down the lower release plate; the lower rear corner of the lower mast reset plate is equipped with an upward-curving hook plate, which is located behind the lower release step at the bottom of the lower arc-shaped hole.

[0022] When maintenance is required, loosen the lower mast fixing bolts to detach them from the lower mast, and then fix the upper mast to the upper mast seat through the upper mast fixing bolts.

[0023] Pulling the two ropes causes the lower mast to rotate along the lower mast base pivot, causing the upper and lower masts to tilt backward simultaneously. This pushes the lower mast movable shaft towards the next gently falling step of the two lower arc-shaped holes, and the two lower mast tension springs pull the lower mast movable shaft downward.

[0024] Finally, the lower mast movable shaft slides down to the bottom of the rear side of the lower gentle step at the lowest part of the two lower arc-shaped holes. The lower mast movable shaft presses down on the two lower hook plates, causing the two lower mast reset slide plates to rotate clockwise along the two lower mast slide plate pivots. The two lower mast pivot compression springs squeeze the two lower mast reset slide plates towards the corresponding lower gentle step plates. The two lower mast buckles enter the two lower mast slots, and the two lower mast reset slide plates enter the two lower arc-shaped holes. The staff then perform maintenance on the upper mast and lower mast.

[0025] After maintenance, the workers can rotate the two fixed pulleys to pull the upper mast forward with the two ropes. This causes the lower mast and upper mast to rotate together along the lower mast seat pivot and rise upward. The lower mast movable shaft rises along the upper edge of the lower mast reset slide plate and the upper edge of the lower arc-shaped hole to the top of the two lower arc-shaped holes. The lower mast movable shaft presses the two lower mast release plates downward. As the two lower mast release plates move downward, they push the two lower mast reset slide plates out of the two lower arc-shaped holes, causing the two lower mast latches to disengage from the two lower mast slots. The left side of both lower mast reset slide plates falls due to their own weight until they contact the lower mast seat. The left side of the two lower mast reset slide plates then stops falling, and under the action of the two lower mast compression springs, both lower mast release plates automatically reset, restoring both the lower mast and upper mast to a vertical position.

[0026] Therefore, the upper and lower masts of the present invention can tilt backwards slowly and synchronously, making it less likely to cause accidents during the tilting process. Both the upper and lower masts are not easily damaged, which facilitates maintenance work.

[0027] Preferably, the lower mast includes a lower fixed section and an upper fixed section. The upper end of the lower fixed section is provided with a lower flange, and the lower end of the upper fixed section is provided with an upper flange. The lower flange and the upper flange are connected by several bolts.

[0028] The lower mast is divided into two parts: a lower fixed section and an upper fixed section, which makes the installation and disassembly of the upper mast more convenient and facilitates the maintenance of the upper mast.

[0029] Preferably, the lower surface of the lower fixed section and the upper surface of the upper fixed section are connected by a central locating pin. The arrangement of the upper flange, lower flange, various bolts, and central locating pin makes the connection between the lower and upper fixed sections more stable and reliable.

[0030] Preferably, the upper mast is equipped with several crossbars.

[0031] A method for using a safe ship mast structure includes the following steps:

[0032] Both the upper mast and the lower mast are in a vertical position. The ship is moving forward. The lower mast is fixedly connected to the lower mast seat by the lower mast fixing bolts. The upper mast fixing bolts are located on the upper mast seat and are detached from the upper mast. The upper mast movable shaft is located at the bottom front side of the upper gentle step at the upper end of the two upper arc-shaped holes, and the lower mast movable shaft is located at the bottom front side of the lower gentle step at the upper end of the two lower arc-shaped holes.

[0033] Step 1, the upper mast collided and tipped over:

[0034] When the mast collides with the obstacle, each roller contacts the obstacle, and the mast slowly tilts backward, with each roller rolling relative to the obstacle. During the backward tilting of the mast, the mast's movable shaft is pushed to the next upper gentle-falling step of the two upper arc-shaped holes, and then the two mast tension springs pull the mast's movable shaft down.

[0035] As the ship continues to move forward and the upper mast has not yet disengaged from the obstacle, the upper mast continues to tilt backward under the resistance of the obstacle, and the upper mast's movable shaft continues to move to the next gentle upward step and slide down.

[0036] Step 2: The upper mast reset slide plate enters the upper arc-shaped hole:

[0037] Step 2-1: After the upper mast is detached from the obstacle, if the upper mast movable shaft is located in the middle of the two upper arc-shaped holes, the worker pulls the rope backward and downward, causing the upper mast movable shaft to slide down to the bottom of the rear side of the upper gentle step at the lowest point of the two upper arc-shaped holes. This causes the upper mast movable shaft to press down on the two upper hook plates, causing the two upper mast reset slide plates to rotate clockwise along the corresponding upper mast slide plate pivot. The two upper mast pivot springs respectively push the two upper mast reset slide plates towards the corresponding upper gentle step plate. The two upper mast buckles respectively enter the two upper mast slots, and the two upper mast reset slide plates respectively enter the two upper arc-shaped holes. The arc-shaped upper edges of the two upper mast reset slide plates respectively block the upper gentle step of the two upper arc-shaped holes.

[0038] Step 2-2: After the upper mast is detached from the obstacle, if the upper mast movable shaft is located at the bottom of the two upper arc-shaped holes, the upper mast movable shaft automatically presses down the two upper hook plates, causing the two upper mast reset slide plates to rotate clockwise along the two upper mast slide plate pivots respectively. The two upper mast pivot compression springs respectively push the two upper mast reset slide plates towards the corresponding upper slow-falling plates. The two upper mast buckles respectively enter the two upper mast slots, and the two upper mast reset slide plates respectively enter the two upper arc-shaped holes. The arc-shaped upper edges of the two upper mast reset slide plates respectively block the upper slow-falling steps of the two upper arc-shaped holes.

[0039] Step 3, reposition the upper mast:

[0040] Rotating the two fixed pulleys causes the two ropes to pull the upper mast forward, causing the upper mast to rotate along the upper mast base pivot and rise upward. This causes the upper mast movable shaft to rise along the upper edge of the upper mast reset slide and the upper edge of the upper arc-shaped hole to the top of the two upper arc-shaped holes. The upper mast movable shaft presses the two upper mast release plates downward. As the two upper mast release plates move downward, they push the two upper mast reset slides out of the two upper arc-shaped holes respectively, causing the two upper mast latches to disengage from the two upper mast slots. The left side of both upper mast reset slides falls due to their own weight until they contact the upper mast base. The left side of both upper mast reset slides then stops falling, and under the action of the two upper mast compression springs, both upper mast release plates automatically reset.

[0041] As a preferred option, the following steps are also included:

[0042] When maintenance is required, loosen the lower mast fixing bolts to detach them from the lower mast, and then fix the upper mast to the upper mast seat through the upper mast fixing bolts.

[0043] Pulling the two ropes causes the lower mast to rotate along the lower mast base pivot, causing the upper and lower masts to tilt backward simultaneously. This pushes the lower mast movable shaft towards the next gently falling step of the two lower arc-shaped holes, and the two lower mast tension springs pull the lower mast movable shaft downward.

[0044] Finally, the lower mast movable shaft slides down to the bottom of the rear side of the lower gentle step at the lowest part of the two lower arc-shaped holes. The lower mast movable shaft presses down on the two lower hook plates, causing the two lower mast reset slide plates to rotate clockwise along the two lower mast slide plate pivots. The two lower mast pivot compression springs squeeze the two lower mast reset slide plates towards the corresponding lower gentle step plates. The two lower mast buckles enter the two lower mast slots, and the two lower mast reset slide plates enter the two lower arc-shaped holes. The staff then perform maintenance on the upper mast and lower mast.

[0045] Therefore, the present invention has the following beneficial effects: after the upper mast is hit, it can slowly and adaptively adjust the angle of tilting backward, so that the upper mast can get away from the obstacle as soon as possible, effectively buffering and reducing the impact force and reducing the damage caused by the collision; the upper mast can tilt backward slowly on its own, and the upper mast and the lower mast can also tilt backward slowly in sync, so that accidents are not likely to occur during the tilting process, the upper mast and the lower mast are not easily damaged, and maintenance work is convenient. Attached Figure Description

[0046] Figure 1 This is a front view of the present invention;

[0047] Figure 2 This is a left view of the present invention;

[0048] Figure 3 This is a schematic diagram of the structure of the present invention laid flat;

[0049] Figure 4 This is a three-view drawing of the upper slow-falling plate and the upper mast reset slide plate of the present invention. Detailed Implementation

[0050] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0051] like Figures 1-4The illustrated embodiment is a safe mast structure, including a lower mast seat 2 on the ship's deck 1, a lower mast 3 on the lower mast seat, an upper mast seat 4 at the upper end of the lower mast, an upper mast 5 on the upper mast seat, two fixed pulleys 6 at the front of the ship's deck, and ropes 61 on the fixed pulleys. Both the lower mast seat and the upper mast seat are U-shaped with upward openings. The lower part of the lower mast is rotatably connected to the lower mast seat via a lower mast seat pivot 21, and the lower part of the upper mast is rotatably connected to the upper mast seat via an upper mast seat pivot 41. The lower mast below the lower mast seat pivot is fixedly connected to the lower mast seat via a lower mast fixing bolt 22, and the upper mast below the upper mast seat pivot is fixedly connected to the upper mast seat via an upper mast fixing bolt 42. Both ropes are connected to the upper part of the upper mast. The front side of the upper mast is provided with a vertically extending roller groove 51, in which multiple rollers 52 are arranged at intervals.

[0052] The upper mast base has two symmetrical upper tilting plates 70, which are fan-shaped with a central angle of 90°. The upper tilting plates have upper arc-shaped holes 701, and the lower edge of the upper arc-shaped holes includes five upper tilting steps 702. The upper mast has a vertically extending upper mast movable groove 53, and the upper mast movable shaft 54 ​​located in the upper mast movable groove extends into the two upper arc-shaped holes at both ends. The upper mast base has two upper mast tension springs 55 on the left and right sides of the upper mast, respectively. The upper ends of the two upper mast tension springs are connected to the lower surfaces of the left and right sides of the upper mast movable shaft, respectively.

[0053] The outer side of the upper tilting plate is provided with an upper mast reset slide plate 80 that matches the shape of the upper arc-shaped hole. The upper mast reset slide plate is rotatably connected to the lower rear part of the upper tilting plate via an upper mast slide plate pivot 703. The upper part of the upper mast reset slide plate is provided with an upper mast release pivot plate 801 located inside the upper mast reset slide plate. The rear part of the upper mast release pivot plate is rotatably connected to the upper mast reset slide plate via an upper mast pivot plate pivot 802. The lower front part of the upper mast reset slide plate is provided with an upper mast compression spring base 803. The upper end of the upper mast compression spring 804 located on the upper mast compression spring base is connected to the upper front edge of the upper mast release pivot plate. The upper front part of the upper mast reset slide plate is provided with an upper mast compression spring base 803. The spring avoids the opening; the outer side of the upper mast release plate is perpendicular to the ground, and the thickness of the upper mast release plate gradually decreases from top to bottom; the upper slow-falling plate is provided with an upper mast buckle 704, and the upper edge of the upper mast reset slide is provided with an upper mast slot 806, in which the upper mast buckle can enter; the outer end of the upper mast slide shaft is provided with a baffle, and the upper mast slide shaft inside the baffle is provided with an upper mast shaft compression spring 705 for squeezing the upper mast reset slide onto the upper slow-falling plate; the lower rear corner of the upper mast reset slide is provided with an upward-curving upper hook plate 807, which is located behind the upper slow-falling step at the bottom of the upper arc-shaped hole.

[0054] The upper end of the lower mast base is provided with two symmetrically placed lower tilting plates 20. The lower tilting plates are fan-shaped with a central angle of 90°. The lower tilting plates are provided with lower arc-shaped holes 201. The lower edge of the lower arc-shaped holes includes five lower tilting steps 202. The lower mast is provided with a vertically extending lower mast movable groove 31. The lower mast movable shaft 32 located in the lower mast movable groove extends into the two lower arc-shaped holes at both ends. The left and right sides of the lower mast on the upper side of the lower mast base are provided with two lower mast tension springs 33. The upper ends of the two lower mast tension springs are connected to the lower surfaces of the left and right parts of the lower mast movable shaft, respectively.

[0055] The outer side of the lower tilting plate is provided with a lower mast reset slide plate 30 that matches the lower arc-shaped hole. The lower mast reset slide plate is rotatably connected to the lower part of the lower tilting plate via a lower mast slide plate pivot 203. The upper part of the lower mast reset slide plate is provided with a lower mast release pivot plate 301 located inside the lower mast reset slide plate. The rear part of the lower mast release pivot plate is rotatably connected to the lower mast reset slide plate via a lower mast pivot plate pivot 302. The lower front part of the lower mast reset slide plate is provided with a lower mast compression spring base support 303. The upper end of the lower mast compression spring 304 located on the lower mast compression spring base support is connected to the upper front edge of the lower mast release pivot plate. The upper front part of the lower mast reset slide plate is provided with a lower mast compression spring avoidance. The opening is as follows: the outer side of the lower mast release plate is perpendicular to the ground, and the thickness of the lower mast release plate gradually decreases from top to bottom; the lower mast release plate is provided with a lower mast buckle 204, and the upper edge of the lower mast reset plate is provided with a lower mast slot 306, into which the lower mast buckle can enter; the outer end of the lower mast slide shaft is provided with a baffle, and the lower mast slide shaft inside the baffle is provided with a lower mast shaft compression spring 205 for squeezing the lower mast reset plate down the lower release plate; the lower rear corner of the lower mast reset plate is provided with an upward-curving lower hook plate 307, which is located behind the lower release step at the bottom of the lower arc-shaped hole.

[0056] The lower mast includes a lower fixed section and an upper fixed section. The upper end of the lower fixed section is provided with a lower flange 34, and the lower end of the upper fixed section is provided with an upper flange 35. The lower flange and the upper flange are connected by four bolts 341.

[0057] The lower surface of the lower fixed section and the upper surface of the upper fixed section are connected at the middle by a central positioning pin 342. The upper mast is equipped with four crossbars 9.

[0058] A method for using a safe ship mast structure includes the following steps:

[0059] Both the upper mast and the lower mast are in a vertical position. The ship is moving forward. The lower mast is fixedly connected to the lower mast seat by the lower mast fixing bolts. The upper mast fixing bolts are located on the upper mast seat and are detached from the upper mast. The upper mast movable shaft is located at the bottom front side of the upper gentle step at the upper end of the two upper arc-shaped holes, and the lower mast movable shaft is located at the bottom front side of the lower gentle step at the upper end of the two lower arc-shaped holes.

[0060] Step 1, the upper mast collided and tipped over:

[0061] When the mast collides with the obstacle, each roller contacts the obstacle, and the mast slowly tilts backward, with each roller rolling relative to the obstacle. During the backward tilting of the mast, the mast's movable shaft is pushed to the next upper gentle-falling step of the two upper arc-shaped holes, and then the two mast tension springs pull the mast's movable shaft down.

[0062] As the ship continues to move forward and the upper mast has not yet disengaged from the obstacle, the upper mast continues to tilt backward under the resistance of the obstacle, and the upper mast's movable shaft continues to move to the next gentle upward step and slide down.

[0063] Step 2: The upper mast reset slide plate enters the upper arc-shaped hole:

[0064] Step 2-1: After the upper mast is detached from the obstacle, if the upper mast movable shaft is located in the middle of the two upper arc-shaped holes, the worker pulls the rope backward and downward, causing the upper mast movable shaft to slide down to the bottom of the rear side of the upper gentle step at the lowest point of the two upper arc-shaped holes. This causes the upper mast movable shaft to press down on the two upper hook plates, causing the two upper mast reset slide plates to rotate clockwise along the corresponding upper mast slide plate pivot. The two upper mast pivot springs respectively push the two upper mast reset slide plates towards the corresponding upper gentle step plate. The two upper mast buckles respectively enter the two upper mast slots, and the two upper mast reset slide plates respectively enter the two upper arc-shaped holes. The arc-shaped upper edges of the two upper mast reset slide plates respectively block the upper gentle step of the two upper arc-shaped holes.

[0065] Step 2-2: After the upper mast is detached from the obstacle, if the upper mast movable shaft is located at the bottom of the two upper arc-shaped holes, the upper mast movable shaft automatically presses down the two upper hook plates, causing the two upper mast reset slide plates to rotate clockwise along the two upper mast slide plate pivots respectively. The two upper mast pivot compression springs respectively push the two upper mast reset slide plates towards the corresponding upper slow-falling plates. The two upper mast buckles respectively enter the two upper mast slots, and the two upper mast reset slide plates respectively enter the two upper arc-shaped holes. The arc-shaped upper edges of the two upper mast reset slide plates respectively block the upper slow-falling steps of the two upper arc-shaped holes.

[0066] Step 3, reposition the upper mast:

[0067] Rotating the two fixed pulleys causes the two ropes to pull the upper mast forward, causing the upper mast to rotate along the upper mast base pivot and rise upward. This causes the upper mast movable shaft to rise along the upper edge of the upper mast reset slide and the upper edge of the upper arc-shaped hole to the top of the two upper arc-shaped holes. The upper mast movable shaft presses the two upper mast release plates downward. As the two upper mast release plates move downward, they push the two upper mast reset slides out of the two upper arc-shaped holes respectively, causing the two upper mast latches to disengage from the two upper mast slots. The left side of both upper mast reset slides falls due to their own weight until they contact the upper mast base. The left side of both upper mast reset slides then stops falling, and under the action of the two upper mast compression springs, both upper mast release plates automatically reset.

[0068] Additionally, when maintenance is required, loosen the lower mast fixing bolts to detach them from the lower mast, allowing the upper mast to be fixedly connected to the upper mast seat via the upper mast fixing bolts; pull the two ropes to rotate the lower mast along the lower mast seat pivot, causing the upper and lower masts to tilt backward simultaneously, pushing the lower mast movable shaft towards the next gentle-falling step of the two lower arc-shaped holes, and the two lower mast tension springs pull the lower mast movable shaft downward;

[0069] Finally, the lower mast movable shaft slides down to the rear bottom of the lower gentle-falling step at the very bottom of the two lower arc-shaped holes. The lower mast movable shaft presses down on the two lower hook plates, causing the two lower mast reset slide plates to rotate clockwise along their respective lower mast slide plate pivots. The two lower mast pivot compression springs respectively push the two lower mast reset slide plates against their corresponding lower gentle-falling locking plates. The two lower mast latches respectively enter the two lower mast locking slots, and the two lower mast reset slide plates respectively enter the two lower arc-shaped holes. The operator then proceeds to... Figure 3 The upper and lower masts shown are undergoing maintenance.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A safe mast structure, characterized in that, The system includes a lower mast seat (2) on the ship's deck (1), a lower mast (3) on the lower mast seat, an upper mast seat (4) on the upper end of the lower mast, an upper mast (5) on the upper mast seat, two fixed pulleys (6) at the front of the ship's deck, and ropes (61) on the fixed pulleys. Both the lower mast seat and the upper mast seat are U-shaped with upward openings. The lower part of the lower mast is rotatably connected to the lower mast seat via a lower mast seat pivot (21), and the lower part of the upper mast is rotatably connected to the upper mast seat via an upper mast seat pivot (41). The lower mast below the lower mast seat pivot is fixedly connected to the lower mast seat via a lower mast fixing bolt (22), and the upper mast below the upper mast seat pivot is fixedly connected to the upper mast seat via an upper mast fixing bolt (42). Both ropes are connected to the upper mast. The upper mast is connected to the front side of the mast and has a vertically extending roller groove (51) with several rollers (52) arranged at intervals in the roller groove. The upper end of the upper mast seat has two left-right symmetrical upper slow-down clamping plates (70), which are fan-shaped with a central angle of 90°. The upper slow-down clamping plates have upper arc-shaped holes (701) and the lower edge of the upper arc-shaped holes includes several upper slow-down steps (702). The upper mast has a vertically extending upper mast movable groove (53), and the upper mast movable shaft (54) located in the upper mast movable groove extends into the two upper arc-shaped holes at both ends. The upper mast seat has two upper mast tension springs (55) on the left and right sides of the upper mast, respectively, and the upper ends of the two upper mast tension springs are connected to the lower surfaces of the left and right sides of the upper mast movable shaft, respectively. The outer side of the upper slow-reverse plate is provided with an upper mast reset slide plate (80) that matches the shape of the upper arc-shaped hole. The upper mast reset slide plate is rotatably connected to the lower rear part of the upper slow-reverse plate through an upper mast slide plate pivot (703). The upper part of the upper mast reset slide plate is provided with an upper mast release pivot plate (801) located inside the upper mast reset slide plate. The rear part of the upper mast release pivot plate is rotatably connected to the upper mast reset slide plate through an upper mast pivot plate pivot (802). The lower front part of the upper mast reset slide plate is provided with an upper mast compression spring base (803). The upper end of the upper mast compression spring (804) provided on the upper mast compression spring base is connected to the upper front edge of the upper mast release pivot plate. The upper front part of the upper mast reset slide plate is provided with The upper mast spring avoids the opening; the outer side of the upper mast release plate is perpendicular to the ground, and the thickness of the upper mast release plate gradually decreases from top to bottom; the upper mast latch (704) is provided on the upper slow-falling plate, and the upper mast groove (806) is provided on the upper edge of the upper mast reset plate, and the upper mast latch can enter the upper mast groove; a baffle is provided at the outer end of the upper mast slide shaft, and an upper mast shaft spring (705) is provided on the upper mast slide shaft inside the baffle for squeezing the upper mast reset plate onto the upper slow-falling plate; an upper hook plate (807) that curves upward is provided at the lower rear corner of the upper mast reset plate, and the upper hook plate is located on the rear side of the upper slow-falling step at the bottom of the upper arc hole.

2. The safe mast structure according to claim 1, characterized in that, The upper end of the lower mast seat is provided with two symmetrically placed lower tilting plates (20). The lower tilting plates are fan-shaped with a central angle of 90°. The lower tilting plates are provided with lower arc-shaped holes (201). The lower edge of the lower arc-shaped holes includes several lower tilting steps (202). The lower mast is provided with a vertically extending lower mast movable groove (31). The two ends of the lower mast movable shaft (32) located in the lower mast movable groove extend into the two lower arc-shaped holes respectively. The left and right sides of the lower mast on the upper side of the lower mast seat are provided with two lower mast tension springs (33). The upper ends of the two lower mast tension springs are connected to the lower surfaces of the left and right parts of the lower mast movable shaft respectively. The lower tilting plate is provided with a lower mast reset slide plate (30) on the outer side, which matches the lower arc-shaped hole. The lower mast reset slide plate is rotatably connected to the lower part of the lower tilting plate through the lower mast slide plate pivot (203). The upper part of the lower mast reset slide plate is provided with a lower mast release pivot plate (301) located inside the lower mast reset slide plate. The rear part of the lower mast release pivot plate is rotatably connected to the lower mast reset slide plate through the lower mast pivot plate pivot (302). The lower front part of the lower mast reset slide plate is provided with a lower mast compression spring base (303). The upper end of the lower mast compression spring (304) provided on the lower mast compression spring base is connected to the upper front edge of the lower mast release pivot plate. The upper front part of the lower mast reset slide plate is provided with a lower mast compression spring base (303). Spring avoids opening; the outer side of the lower mast release plate is perpendicular to the ground, and the thickness of the lower mast release plate gradually decreases from top to bottom; the lower mast release plate is provided with a lower mast buckle (204), and the upper edge of the lower mast reset plate is provided with a lower mast slot (306), and the lower mast buckle can enter the lower mast slot; the outer end of the lower mast slide shaft is provided with a baffle, and the lower mast slide shaft inside the baffle is provided with a lower mast shaft compression spring (205) for squeezing the lower mast reset plate down the lower release plate; the lower rear corner of the lower mast reset plate is provided with an upward-curving lower hook plate (307), and the lower hook plate is located on the rear side of the lower release step at the bottom of the lower arc hole.

3. The safe mast structure according to claim 1, characterized in that, The lower mast includes a lower fixed section and an upper fixed section. The upper end of the lower fixed section is provided with a lower flange (34), and the lower end of the upper fixed section is provided with an upper flange (35). The lower flange and the upper flange are connected by several bolts (341).

4. The safe mast structure according to claim 3, characterized in that, The middle part of the lower surface of the lower fixed section and the middle part of the upper surface of the upper fixed section are connected by a central positioning pin (342).

5. The safe mast structure according to claim 1, 2, 3, or 4, characterized in that, Several crossbars (9) are provided on the upper mast.

6. A method of using a ship mast structure with good safety as described in claim 2, characterized in that, Includes the following steps: Both the upper mast and the lower mast are in a vertical position. The ship is moving forward. The lower mast is fixedly connected to the lower mast seat by the lower mast fixing bolts. The upper mast fixing bolts are located on the upper mast seat and are detached from the upper mast. The upper mast movable shaft is located at the bottom front side of the upper gentle step at the upper end of the two upper arc-shaped holes, and the lower mast movable shaft is located at the bottom front side of the lower gentle step at the upper end of the two lower arc-shaped holes. Step 1, the upper mast collided and tipped over: When the mast collides with the obstacle, each roller contacts the obstacle, and the mast slowly tilts backward, with each roller rolling relative to the obstacle. During the backward tilting of the mast, the mast's movable shaft is pushed to the next upper gentle-falling step of the two upper arc-shaped holes, and then the two mast tension springs pull the mast's movable shaft down. As the ship continues to move forward and the upper mast has not yet disengaged from the obstacle, the upper mast continues to tilt backward under the resistance of the obstacle, and the upper mast's movable shaft continues to move to the next gentle upward step and slide down. Step 2: The upper mast reset slide plate enters the upper arc-shaped hole: Step 2-1: After the upper mast is detached from the obstacle, if the upper mast movable shaft is located in the middle of the two upper arc-shaped holes, the worker pulls the rope backward and downward, causing the upper mast movable shaft to slide down to the bottom of the rear side of the upper gentle step at the lowest point of the two upper arc-shaped holes. This causes the upper mast movable shaft to press down on the two upper hook plates, causing the two upper mast reset slide plates to rotate clockwise along the corresponding upper mast slide plate pivot. The two upper mast pivot springs respectively push the two upper mast reset slide plates towards the corresponding upper gentle step plate. The two upper mast buckles respectively enter the two upper mast slots, and the two upper mast reset slide plates respectively enter the two upper arc-shaped holes. The arc-shaped upper edges of the two upper mast reset slide plates respectively block the upper gentle step of the two upper arc-shaped holes. Step 2-2: After the upper mast is detached from the obstacle, if the upper mast movable shaft is located at the bottom of the two upper arc-shaped holes, the upper mast movable shaft automatically presses down the two upper hook plates, causing the two upper mast reset slide plates to rotate clockwise along the two upper mast slide plate pivots respectively. The two upper mast pivot compression springs respectively push the two upper mast reset slide plates towards the corresponding upper slow-falling plates. The two upper mast buckles respectively enter the two upper mast slots, and the two upper mast reset slide plates respectively enter the two upper arc-shaped holes. The arc-shaped upper edges of the two upper mast reset slide plates respectively block the upper slow-falling steps of the two upper arc-shaped holes. Step 3, reposition the upper mast: Rotating the two fixed pulleys causes the two ropes to pull the upper mast forward, causing the upper mast to rotate along the upper mast base pivot and rise upward. This causes the upper mast movable shaft to rise along the upper edge of the upper mast reset slide and the upper edge of the upper arc-shaped hole to the top of the two upper arc-shaped holes. The upper mast movable shaft presses the two upper mast release plates downward. As the two upper mast release plates move downward, they push the two upper mast reset slides out of the two upper arc-shaped holes respectively, causing the two upper mast latches to disengage from the two upper mast slots. The left side of both upper mast reset slides falls due to their own weight until they contact the upper mast base. The left side of both upper mast reset slides then stops falling, and under the action of the two upper mast compression springs, both upper mast release plates automatically reset.

7. The method of using the safe mast structure according to claim 6, characterized in that, It also includes the following steps: When maintenance is required, loosen the lower mast fixing bolts to detach them from the lower mast, and then fix the upper mast to the upper mast seat through the upper mast fixing bolts. Pulling the two ropes causes the lower mast to rotate along the lower mast base pivot, causing the upper and lower masts to tilt backward simultaneously. This pushes the lower mast movable shaft towards the next gently falling step of the two lower arc-shaped holes, and the two lower mast tension springs pull the lower mast movable shaft downward. Finally, the lower mast movable shaft slides down to the bottom of the rear side of the lower gentle step at the lowest part of the two lower arc-shaped holes. The lower mast movable shaft presses down on the two lower hook plates, causing the two lower mast reset slide plates to rotate clockwise along the two lower mast slide plate pivots. The two lower mast pivot compression springs squeeze the two lower mast reset slide plates towards the corresponding lower gentle step plates. The two lower mast buckles enter the two lower mast slots, and the two lower mast reset slide plates enter the two lower arc-shaped holes. The staff then perform maintenance on the upper mast and lower mast.

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