A hydraulic rack type lifting system of a truss leg jack-up platform and an application method thereof

Abstract

This invention provides a hydraulic rack and pinion lifting system and its application method for a truss-leg self-elevating platform. The hydraulic rack and pinion lifting system is mounted on the chord tube of the leg with a rack and includes a lifting rack, a lifting cylinder, a locking device mechanism, and a fixing frame. The hydraulic rack and pinion lifting system is installed on the main deck of the self-elevating platform. The lifting rack engages and disengages with the rack on the leg chord tube, enabling continuous lifting and lowering of the offshore platform. This invention is a hydraulic rack and pinion lifting system, in which the hydraulic device has elasticity and vibration absorption properties, providing a certain hydraulic buffering effect, making the system stable and reliable in operation. The meshing between the racks does not require gears, resulting in lower manufacturing process requirements. The power drive structure is simple, and the cost is lower than that of an electric gear and rack lifting system, saving costs, reducing lifting difficulty, and minimizing the risk of failure.

Description

Technical Field

[0001] This invention relates to the field of marine platform technology, specifically to a hydraulic rack and pinion lifting system and its application method for a truss-leg self-elevating platform. Background Technology

[0002] The lifting device is installed at the junction of the self-elevating platform's legs and the platform body. Driving the lifting device causes the legs and body to move up and down relative to each other. The lifting device also serves to fix the platform body to a certain position on the legs. In this case, the lifting device mainly bears the vertical force, while the horizontal force is transmitted by the fixing device. The most commonly used lifting devices are rack and pinion lifting systems and hydraulic pin-type lifting systems.

[0003] Among them, the rack and pinion lifting system mainly includes an electric motor or hydraulic motor, a reduction gear, a mounting bracket for installing the reduction gear, and a rack installed on the pile legs; the jacking hydraulic pin-type lifting system mainly includes a hydraulic cylinder drive, a ring beam pin, and a fixing pin. Due to the special structure of its pile legs, truss pile leg self-elevating platforms all use rack and pinion lifting systems. This system requires a large and complex speed-changing mechanism, is bulky, has high gear manufacturing requirements, and is expensive. The jacking hydraulic pin-type lifting system is mainly used for cylindrical pile leg self-elevating platforms. Its upper and lower pile leg ring beam structures are relatively large. If the main body is heavy, it requires a large pin size, uses a large amount of steel, has a complex operating system, and is relatively cumbersome to operate. Its lifting device operates intermittently, and the lifting speed is slow. Summary of the Invention

[0004] To address the aforementioned issues, this invention proposes a hydraulic rack and pinion lifting system and its application method for a truss leg self-elevating platform. The lifting and lowering of the leg is achieved through the meshing of racks, eliminating the need for a complex speed-changing mechanism, saving costs, and reducing the likelihood of malfunctions.

[0005] To achieve the above objectives, the present invention provides a hydraulic rack and pinion lifting system for a truss leg self-elevating platform, comprising: a locking device, a pile fixing frame, a platform body, a lifting cylinder, and a lifting rack;

[0006] The lifting cylinder is connected to one side of the platform body, and the fixed end of the lifting cylinder is connected to the upper end of the platform body by a first hinge.

[0007] The movable end of the lifting cylinder is connected to the lower end of the lifting rack, and the lifting rack and the movable end of the lifting cylinder are connected by a second hinge.

[0008] The lifting rack has two side-push cylinders at its upper and lower ends, respectively. The two side-push cylinders at the upper end of the lifting rack are the first side-push cylinders, and the two side-push cylinders at the lower end of the lifting rack are the second side-push cylinders. One side of the first side-push cylinder and the second side-push cylinder are respectively connected to the lifting rack by a third hinge.

[0009] The other side of the first side push cylinder and the second side push cylinder are respectively connected to the pile fixing frame by a fourth hinge;

[0010] The locking device is locked to the platform body via a screw drive.

[0011] Preferably, the first and second side-push cylinders push the lifting rack to engage and disengage with the rack on the side wall of the pile leg chord tube, thereby realizing the lifting and lowering of the self-elevating platform by pushing the lifting rack through the lifting cylinder.

[0012] Preferably, the lifting rack can determine the number of teeth and tooth thickness parameters according to the weight of the platform body to ensure that the force on a single tooth is within the permissible range.

[0013] Preferably, the lifting cylinder, the first side-push cylinder, the second side-push cylinder, and the rack plate are all connected by hinges, allowing relative rotation between them.

[0014] Preferably, the lifting cylinder is provided with gap plates on both sides. The gap plates are used to guide the lifting rack in the horizontal direction and prevent the lifting rack from disengaging from the pile leg chord tube with rack.

[0015] Preferably, the gap plate is a wear-resistant plate.

[0016] Preferably, two opposing lifting racks are provided along the circumferential direction of the pile leg chord tube, and the lifting racks mesh with the racks on the side wall of the pile leg chord tube.

[0017] Preferably, the system further includes several hydraulic cylinders, the fixed ends of which are connected to the platform body and the pile frame by hinges, the movable ends of which are hinged to the bottom of the lifting rack, and the several hydraulic cylinders are arranged in the same plane.

[0018] This invention also provides a method for applying a hydraulic rack and pinion lifting system for a truss leg self-elevating platform, comprising the following steps:

[0019] Ascending Platform Method:

[0020] S1: Under the action of the first and second side push cylinders, the lifting rack meshes with the rack on the pile leg chord tube, the locking device opens, and the lifting cylinder moves synchronously to lower the pile leg by one pitch; the locking device closes, and the screw drive device is used for locking. By pushing the first and second side push cylinders, the lifting rack separates from the rack on the pile leg chord tube, and the lifting cylinder pushes to move the lifting rack upward by one pitch;

[0021] S2: Repeat S1 until the leg is fixed to the seabed; the lifting rack engages with the rack on the leg chord tube, and the locking device is opened to its original state;

[0022] S3: After the legs are lowered to the seabed and fixed, the lifting cylinders move synchronously to raise the platform body by one pitch; the locking device is closed, and two pairs of screw transmission devices are used for locking. The first and second side push cylinders separate the lifting rack from the rack on the leg chord tube. The lifting cylinders push the lifting rack to move it upward by one pitch.

[0023] S4: Repeat S3 until the platform body is raised to the working position.

[0024] Descent platform method:

[0025] S5: Under the action of the first and second side push cylinders, the lifting rack meshes with the rack on the pile leg chord tube, the locking device opens, and the lifting cylinder moves synchronously to lower the platform body by one pitch; the locking device closes, and the screw drive device is used for locking. By pushing the first and second side push cylinders, the lifting rack separates from the rack on the pile leg chord tube, and the lifting cylinder resets to move the lifting rack downward by one pitch;

[0026] S6: Repeat S5 to start the next work cycle until the main body of the platform descends to sea level.

[0027] Compared with the prior art, the present invention has the following advantages and technical effects:

[0028] 1. The lifting speed of the hydraulic rack and pinion lifting system of the present invention is between that of the gear rack and pinion lifting system and the hydraulic pin-type lifting system.

[0029] 2. This invention is a hydraulic rack and pinion lifting system, in which the hydraulic device has elasticity and vibration absorption performance, and has a certain hydraulic buffering effect, making the system run stably and reliably. The lifting and lowering of the pile legs is achieved through the meshing between the racks, without the need for gears. The manufacturing process requirements are low, the power drive part has a simple structure, and there is no need for a complex speed change mechanism, which saves costs, reduces the difficulty of lifting and lowering, and is less prone to failure. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0031] Figure 1 This is a cross-sectional schematic diagram of the lifting system of the present invention along the AA direction;

[0032] Figure 2 This is a top view of the lifting system of the present invention;

[0033] Figure 3 This is a schematic diagram of the hydraulic cylinder and lifting rack of the lifting system of the present invention;

[0034] Figure 4 This is a schematic diagram of the locking screw transmission device of the present invention;

[0035] Among them, 1-pile leg chord tube, 2-lifting rack, 3-first side push cylinder, 4-second side push cylinder, 5-pile fixing frame, 6-lifting cylinder, 7-platform body, 8-locking device, 1001-first hinge, 1003-second hinge, 1004-third hinge, 1005-fourth hinge, 1002-screw drive device. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0038] like Figure 1-4 As shown, the present invention provides a hydraulic rack and pinion lifting system for a truss leg self-elevating platform, comprising: a locking device 8, a pile fixing frame 5, a platform body 7, a lifting cylinder 6, and a lifting rack 2;

[0039] The lifting cylinder 6 is connected to one side of the platform body 7, and the fixed end of the lifting cylinder 6 is connected to the upper end of the platform body 7 by the first hinge 1001.

[0040] The movable end of the lifting cylinder 6 is connected to the lower end of the lifting rack 2, and the lifting rack 2 and the movable end of the lifting cylinder 6 are connected by a second hinge 1003.

[0041] The lifting rack 2 has two side-push cylinders at its upper and lower ends respectively. The two side-push cylinders at the upper end of the lifting rack 2 are the first side-push cylinders 3, and the two side-push cylinders at the lower end of the lifting rack 2 are the second side-push cylinders 4. One side of the first side-push cylinders 3 and the second side-push cylinders 4 are respectively connected to the lifting rack 2 by a third hinge 1004.

[0042] The other sides of the first side push cylinder 3 and the second side push cylinder 4 are respectively connected to the pile fixing frame 5 by the fourth hinge 1005.

[0043] The locking device 8 is locked to the platform body 7 via the screw drive device 1002.

[0044] Specifically, the first side push cylinder 3 and the second side push cylinder 4 push the lifting rack 2 to engage and disengage with the rack on the side wall of the pile leg chord tube 1, and the lifting cylinder 6 pushes the lifting rack 2 to realize the lifting of the self-elevating platform.

[0045] Specifically, the lifting rack 2 can determine parameters such as the number of teeth and tooth thickness according to the weight of the platform body 7, ensuring that the force on a single tooth is within the permissible range.

[0046] Specifically, the lifting cylinder 6, the first side push cylinder 3, the second side push cylinder 4 and the rack plate are all connected by hinges, allowing relative rotation between them.

[0047] Specifically, the lifting cylinder 6 is provided with gap plates on both sides. The gap plates are wear-resistant plates and are used to guide the lifting rack 2 in the horizontal direction to prevent the lifting rack 2 from separating from the pile leg chord tube 1 with rack.

[0048] Specifically, two opposing lifting racks are provided along the circumference of the pile leg chord tube 1, and the lifting racks mesh with the racks on the side wall of the pile leg chord tube 1.

[0049] Specifically, the system also includes several hydraulic cylinders. The fixed ends of the hydraulic cylinders are connected to the platform body 7 and the fixed pile frame 5 by hinges. The movable end of the lifting cylinder 6 is hinged to the bottom of the lifting rack 2. Several hydraulic cylinders are arranged in the same plane.

[0050] This invention also provides a method for applying a hydraulic rack and pinion lifting system for a truss leg self-elevating platform, comprising the following steps:

[0051] Ascending Platform Method:

[0052] S1: Under the action of the first side push cylinder 3 and the second side push cylinder 4, the lifting rack 2 is engaged with the rack on the pile leg chord tube 1, the locking device 8 is opened, and the lifting cylinder 6 moves synchronously to lower the pile leg by one pitch; the locking device 8 is closed, and the screw transmission device 1002 is used for locking. By pushing the first side push cylinder 3 and the second side push cylinder 4, the lifting rack 2 is separated from the rack on the pile leg chord tube 1, and the lifting cylinder 6 pushes to move the lifting rack 2 upward by one pitch;

[0053] S2: Repeat S1 until the leg is fixed to the seabed; the lifting rack 2 engages with the rack on the leg chord tube 1, and the locking device 8 is opened to its original state;

[0054] S3: After the leg is lowered to the seabed and fixed, the lifting cylinder 6 moves synchronously to raise the platform body 7 by one pitch; the locking device 8 is closed, and two pairs of screw transmission devices 1002 are used for locking. The first side push cylinder 3 and the second side push cylinder 4 separate the lifting rack 2 from the rack on the leg chord tube 1. The lifting cylinder 6 pushes to move the lifting rack 2 upward by one pitch.

[0055] S4: Repeat S3 until the platform body 7 is raised to the working position.

[0056] Descent platform method:

[0057] S5: Under the action of the first side push cylinder 3 and the second side push cylinder 4, the lifting rack 2 is engaged with the rack on the pile leg chord tube 1, the locking device 8 is opened, and the lifting cylinder 6 moves synchronously to lower the platform body 7 by one pitch; the locking device 8 is closed, and the screw transmission device 1002 is used for locking. By pushing the first side push cylinder 3 and the second side push cylinder 4, the lifting rack 2 is separated from the rack on the pile leg chord tube 1, and the lifting cylinder 6 is reset to move the lifting rack 2 downward by one pitch;

[0058] S6: Repeat S5 to start the next work cycle until the platform body 7 descends to sea level.

[0059] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A hydraulic rack and pinion lifting system for a truss-leg self-elevating platform, characterized in that, include: Locking device (8), pile fixing frame (5), platform body (7), lifting cylinder (6), lifting rack (2); The lifting cylinder (6) is connected to one side of the platform body (7), and the fixed end of the lifting cylinder (6) is connected to the upper end of the platform body (7) by a first hinge (1001). The movable end of the lifting cylinder (6) is connected to the lower end of the lifting rack (2), and the lifting rack (2) and the movable end of the lifting cylinder (6) are connected by a second hinge (1003). The lifting rack (2) has two side-push cylinders at its upper and lower ends respectively. The two side-push cylinders at the upper end of the lifting rack (2) are the first side-push cylinders (3), and the two side-push cylinders at the lower end of the lifting rack (2) are the second side-push cylinders (4). One side of the first side-push cylinder (3) and the second side-push cylinder (4) are respectively connected to the lifting rack (2) by a third hinge (1004). The other side of the first side push cylinder (3) and the second side push cylinder (4) are respectively connected to the fixed pile frame (5) by a fourth hinge (1005); The locking device (8) is locked to the platform body (7) by a screw drive device (1002).

2. The hydraulic rack and pinion lifting system for the truss leg self-elevating platform according to claim 1, characterized in that, The first side-push cylinder (3) and the second side-push cylinder (4) push the lifting rack (2) to engage and disengage with the rack on the side wall of the pile leg chord tube (1). The lifting cylinder (6) pushes the lifting rack (2) to realize the lifting of the self-elevating platform.

3. The hydraulic rack and pinion lifting system for the truss leg self-elevating platform according to claim 1, characterized in that, The lifting rack (2) can determine the number of teeth and tooth thickness parameters according to the weight of the platform body (7) to ensure that the force on a single tooth is within the permissible range.

4. The hydraulic rack and pinion lifting system for the truss leg self-elevating platform according to claim 1, characterized in that, The lifting cylinder (6), the first side push cylinder (3), the second side push cylinder (4) are all connected to the rack plate by hinges, allowing relative rotation between them.

5. The hydraulic rack and pinion lifting system for the truss leg self-elevating platform according to claim 2, characterized in that, The lifting cylinder (6) is provided with gap plates on both sides. The gap plates are used to guide the lifting rack (2) in the horizontal direction and prevent the lifting rack (2) from separating from the pile leg chord tube (1) with rack.

6. The hydraulic rack and pinion lifting system for the truss leg self-elevating platform according to claim 5, characterized in that, The gap plate is a wear-resistant plate.

7. The hydraulic rack and pinion lifting system for the truss leg self-elevating platform according to claim 2, characterized in that, Two opposing lifting racks are provided along the circumference of the pile leg chord tube (1), and the lifting racks mesh with the racks on the side wall of the pile leg chord tube (1).

8. The hydraulic rack and pinion lifting system for the truss leg self-elevating platform according to claim 1, characterized in that, The system also includes several hydraulic cylinders. The fixed end of the hydraulic cylinder is connected to the platform body (7) and the pile frame (5) by hinges. The movable end of the lifting cylinder (6) is hinged to the bottom of the lifting rack (2). Several hydraulic cylinders are arranged in the same plane.

9. A method for applying the hydraulic rack and pinion lifting system of the truss leg self-elevating platform according to any one of claims 1-8, characterized in that, Includes the following steps: Ascending Platform Method: S1: Under the action of the first side push cylinder (3) and the second side push cylinder (4), the lifting rack (2) and the rack on the pile leg chord tube (1) are engaged with each other, the locking device (8) is opened, and the lifting cylinder (6) moves synchronously to lower the pile leg by one pitch; the locking device (8) is closed, and the screw transmission device (1002) is used for locking. By pushing the first side push cylinder (3) and the second side push cylinder (4), the lifting rack (2) and the rack on the pile leg chord tube (1) are separated from each other, and the lifting cylinder (6) pushes the lifting rack (2) to move upward by one pitch; S2: Repeat S1 until the leg is fixed to the seabed; the lifting rack (2) engages with the rack on the leg chord tube (1), and the locking device (8) is opened to the original state; S3: After the leg is lowered to the seabed and fixed, the lifting cylinder (6) moves synchronously to raise the platform body (7) by one pitch; the locking device (8) is closed, and two pairs of screw transmission devices (1002) are used for locking. The first side push cylinder (3) and the second side push cylinder (4) separate the lifting rack (2) from the rack on the leg chord tube (1), and the lifting cylinder (6) pushes to move the lifting rack (2) upward by one pitch; S4: Repeat S3 until the platform body (7) is raised to the working position; Descent platform method: S5: Under the action of the first side push cylinder (3) and the second side push cylinder (4), the lifting rack (2) and the rack on the pile leg chord tube (1) are engaged with each other, the locking device (8) is opened, and the lifting cylinder (6) moves synchronously to make the platform body (7) drop by one pitch; the locking device (8) is closed, and the screw transmission device (1002) is used for locking. By pushing the first side push cylinder (3) and the second side push cylinder (4), the lifting rack (2) and the rack on the pile leg chord tube (1) are separated from each other, and the lifting cylinder (6) is reset to make the lifting rack (2) move down one pitch; S6: Repeat S5 to start the next work cycle until the platform body (7) descends to sea level.

Images