A method of lifting a main engine on an inclined berth

Abstract

The application discloses a method for hoisting a main engine on an inclined berth, wherein a bow tower crane and a stern tower crane are connected with a main engine lifting hole through a connecting hoisting row, and the height difference between the bow end and the stern end in the main engine hoisting process can be flexibly controlled by using the two tower cranes, so that the main engine can be hoisted and placed on a main engine panel in an inclined state, the problem that the installation time is long due to the fact that the inclination angle of the main engine cannot be adjusted during single-hook hoisting is effectively solved, the hoisting risk caused by the fact that some hoisting points are overweight due to the uneven force of the hoisting points is solved, the hoisting operation time of the main engine is greatly shortened, and the hoisting operation risk is reduced.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a method for hoisting a main engine on an inclined slipway. Background Technology

[0002] When a ship is being loaded onto a tilted slipway, the slipway has a certain inclination. The slipway is typically equipped with a gantry crane (tower crane) with a ram's horn hook type main hook. During the main engine lifting, a single crane cannot pre-adjust the main engine's attitude to match the slipway's inclination. Currently, when lifting the main engine, only one end can be pre-positioned on the base, and the other end slowly lowered. This method has a long installation and adjustment time. Furthermore, because the lifting points on the main engine are asymmetrically arranged, using a single crane with a single hook during adjustment can result in some lifting points being unloaded, potentially leading to excessive stress on those points and creating safety hazards. Summary of the Invention

[0003] In view of this, the present invention provides a method for hoisting the main engine on an inclined slipway. In view of the characteristics of the main engine hoisting point spacing being too small and the main engine needing to be installed at an incline, the method solves the problem of long installation time caused by the inability to adjust the incline angle of the main engine when hoisting with a single hook, as well as the hoisting risk caused by some hoisting points being overloaded due to uneven force on the hoisting points.

[0004] A method for hoisting a main engine on an inclined slipway specifically includes the following steps: S1, using steel wire ropes to connect the hoisting block to the bow tower crane, stern tower crane and main engine hoisting hole; The upper surface of the connecting crane has two sets of upper lifting lugs symmetrically arranged on both sides for connecting the connecting crane to the hooks of the bow tower crane and the stern tower crane. The lower surface of the connecting crane has a set of lower lifting lugs in the middle for connecting the connecting crane to the main crane's lifting hole. The distance between the two sets of upper lifting lugs is equal to the distance between the hooks of the bow tower crane and the stern tower crane. S2, the bow and stern tower cranes move the main unit above its installation position; S3, the bow and stern tower cranes simultaneously and slowly lower the main unit until the bottom of the main unit is at the first height of the main unit panel and then stop lowering; S4, the bow crane remains stationary while the stern crane slowly descends, so that the tilt angle of the main engine is equal to the slope of the tilting slipway; S5, the bow and stern tower cranes descend synchronously, positioning and installing the main unit on the main unit panel.

[0005] Preferably, the wire rope comprises an upper section, a middle section, and a lower section. In step S1, the specific steps for connecting the hoisting block to the bow tower crane, stern tower crane, and main engine hoisting hole using wire ropes are as follows: Calculate the safe distance for hoisting the main unit. Based on the tower crane's lifting height and the safe distance for hoisting the main unit, calculate the maximum total length of the wire rope. The appropriate length of wire rope is provided for each section based on the maximum total length of the wire rope and the height of the hoisting block; The hooks of the bow tower crane and the stern tower crane are connected to the upper lifting lugs on both sides of the lifting block using the upper section of the steel wire rope. Install two shackles on the lower lifting lugs, and install two folded middle section steel wire ropes on each shackle; Install a shackle at each end of each middle section of the wire rope, connect a lower section of the wire rope to each shackle, and fix the lower end of each lower section of the wire rope into the corresponding lifting hole on the main machine.

[0006] Preferably, the maximum total length of the wire rope L = H - H1, where H is the lifting height of the tower crane and H1 is the main hoisting safety distance, which refers to the safe distance required from the main hoisting hole to the ground when the main hoist is being hoisted.

[0007] Preferably, in step S2, the specific steps for the bow and stern tower cranes to move the main unit above its installation position are as follows: The bow and stern tower cranes are lifted synchronously. After the main unit is vertically lifted to the second height above the ground, check for any abnormalities. If there are no abnormalities, continue to lift the main unit vertically until the bottom of the main unit is higher than the stern structure. When the bottom of the main unit is higher than the stern structure, stop vertical lifting and move the bow and stern tower cranes synchronously along their respective tracks until the main unit is moved above its installation position.

[0008] Preferably, in step S5, during the synchronous descent of the bow and stern tower cranes, the relative height of the hooks of the bow and stern tower cranes is continuously adjusted to ensure the tilt angle of the main unit and ensure accurate installation and positioning of the main unit.

[0009] Preferably, the lifting platform includes a lifting platform body, two sets of upper lifting lugs symmetrically arranged along the longitudinal center line of the lifting platform body, and a lower lifting lug located in the middle of the lifting platform body. Each set of upper lifting lugs includes two upper lifting plates symmetrically arranged along the transverse center line of the lifting platform body. Each upper lifting plate has two lifting holes, and the lower lifting lug has two lifting holes.

[0010] Preferably, an upper reinforcing web is fixed to the plate surface around the lifting hole of the upper lifting plate, and a lower reinforcing web is fixed to the plate surface around the lifting hole of the lower lifting lug.

[0011] The beneficial effects of this invention are: 1. This invention connects the bow and stern tower cranes to the main unit's lifting hole via a tandem lifting system. By utilizing the two tower cranes, the height difference between the bow and stern ends can be flexibly controlled during the main unit's lifting process, allowing it to be lifted and placed onto the main unit's panel in an inclined state. This effectively solves the problem of long installation time caused by the inability to adjust the main unit's tilt angle during single-hook lifting, as well as the lifting risk caused by uneven force on the lifting points leading to overloading of some lifting points. This greatly shortens the main unit's lifting operation time and also reduces the lifting operation risk.

[0012] 2. If two cranes are used to lift the main unit, the cranes on the same side need to have a large spacing between their lifting points to avoid interference with the traveling mechanism. However, the spacing between the lifting points of the main unit does not meet this requirement. Therefore, it is impossible to connect the two cranes to the main unit to achieve smooth lifting of the main unit. This invention connects the bow tower crane and the stern tower crane to the lifting hole of the main unit through a lifting block, which effectively solves the problem that it is impossible to use two cranes to lift the main unit due to insufficient spacing between the lifting points of the main unit. This not only greatly shortens the lifting operation time of the main unit, but also improves the positioning and installation accuracy of the main unit. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the main engine being hoisted on the inclined slipway in this invention.

[0015] Figure 2 This is a front view of the suspended platform.

[0016] Figure 3 This is a top view of the suspended platform.

[0017] Figure 4 yes Figure 2 Sectional view of AA.

[0018] Figure 5 yes Figure 2 Cross-sectional view of the middle section (BB).

[0019] The meanings of the labels in the diagram are as follows: 1 is the main engine, 2 is the inclined slipway, 3 is the hoisting bar, 4 is the hoisting bar body, 5 is the upper reinforcing web plate, 6 is the lower reinforcing web plate, 7 is the upper lifting lug, 8 is the lower lifting lug, 9 is the bow tower crane, 10 is the stern tower crane, 11 is the wire rope, 12 is the main engine lifting hole, 13 is the main engine panel, and 14 is the stern structure. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0021] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0022] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0023] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0025] To better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0026] This invention provides a method for hoisting a main engine on an inclined slipway, specifically including the following steps: S1, the hoisting bar 3 is connected to the bow tower crane 9, the stern tower crane 10 and the main engine hoisting hole 12 by steel wire rope 11.

[0027] The upper surface of the connecting hoist 3 is symmetrically provided with two sets of upper lifting lugs 7 on both sides for connecting the connecting hoist 3 to the hooks of the bow tower crane and the stern tower crane. The lower surface of the connecting hoist 3 is provided with a set of lower lifting lugs 8 in the middle position for connecting the connecting hoist 3 to the main lifting hole 12. The distance between the two sets of upper lifting lugs 7 is equal to the distance between the hooks of the bow tower crane and the stern tower crane.

[0028] Specifically, the lifting platform 3 includes a lifting platform body 4, two sets of upper lifting lugs 7 symmetrically arranged along the longitudinal centerline of the lifting platform body 4, and a lower lifting lug 8 located in the middle of the lifting platform body 4. Each set of upper lifting lugs 7 includes two upper lifting plates symmetrically arranged along the transverse centerline of the lifting platform body 4. Each upper lifting plate has two lifting holes, and the lower lifting lug 8 has two lifting holes. Upper reinforcing web plates 5 are fixed to the plate surface around the lifting holes of the upper lifting plates, and lower reinforcing web plates 6 are fixed to the plate surface around the lifting holes of the lower lifting lug 8.

[0029] The specific steps for connecting the hoisting bar 3 to the bow tower crane, stern tower crane, and main engine hoisting hole 12 using wire rope 11 are as follows: First, calculate the safe lifting distance of the main unit 1. Based on the tower crane lifting height and the safe lifting distance of the main unit 1, calculate the maximum total length of the wire rope. The maximum total length of the wire rope L = H - H1, where H is the lifting height of the tower crane and H1 is the safe distance for hoisting the main unit 1. The safe distance for hoisting the main unit 1 refers to the safe distance required from the lifting hole 12 of the main unit to the ground when hoisting the main unit. Then, according to the maximum total length of the wire rope and the height of the hoisting block 3, wire rope of corresponding length is equipped. The wire rope 11 includes three sections: the upper section wire rope, the middle section wire rope and the lower section wire rope. Then, the hooks of the bow tower crane and the stern tower crane are connected to the upper lifting lugs 7 on the left and right sides of the connecting hoisting block 3 using the upper section of the steel wire rope. Then install two 150-ton shackles on the lower lifting lug 8, and install two folded middle section steel wire ropes on each shackle, that is, there are a total of four middle section steel wire ropes. Finally, a shackle is installed at each end of each middle section of the wire rope, and a lower section of the wire rope is connected to each shackle. The lower ends of each lower section of the wire rope are fixed in the corresponding main machine lifting hole 12 on the main machine 1. That is, there are a total of 8 main machine lifting holes 12 on the main machine, and each main machine lifting hole 12 is connected to a lower section of the wire rope.

[0030] S2, the bow tower crane 9 and the stern tower crane 10 move the main unit 1 above its installation position.

[0031] Specifically, firstly, the bow tower crane 9 and the stern tower crane 10 are lifted synchronously. After the main unit 1 is vertically lifted to the second height above the ground (generally 300mm), observe whether there are any abnormalities. If there are no abnormalities, continue to lift the main unit 1 vertically until the bottom of the main unit 1 is higher than the stern structure 14. When the bottom of the main unit 1 is higher than the stern structure 14, vertical lifting stops. Then, the bow tower crane and the stern tower crane move synchronously along their respective tracks until the main unit 1 is moved above its installation position.

[0032] S3, after the main unit 1 is moved above its installation position, the bow tower crane 9 and the stern tower crane 10 simultaneously and slowly lower the main unit 1 until the bottom of the main unit 1 is at the first height (about 1 meter) away from the main unit panel 13 and then stop lowering; S4, the bow crane 9 remains stationary while the stern crane 10 slowly descends, so that the tilt angle of the main engine 1 is equal to the slope of the tilting slipway 2; S5, the bow tower crane 9 and the stern tower crane 10 descend synchronously, positioning the main unit 1 on the main unit panel 13.

[0033] During the synchronous descent of the bow and stern tower cranes, the relative height of their hooks is continuously adjusted to ensure the tilt angle of the main unit 1 and to ensure accurate installation and positioning of the main unit 1.

[0034] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A method for hoisting a main engine on an inclined slipway, characterized in that, Specifically, the following steps are included: S1, using steel wire rope (11) to connect the hoisting bar (3) to the bow tower crane (9), stern tower crane (10) and main engine hoisting hole (12); The upper surface of the connecting hoist (3) is symmetrically provided with two sets of upper lifting lugs (7) for connecting the connecting hoist (3) to the hooks of the bow tower crane and the stern tower crane. The lower surface of the connecting hoist (3) is provided with a set of lower lifting lugs (8) for connecting the connecting hoist (3) to the main lifting hole (12). The distance between the two sets of upper lifting lugs (7) is equal to the distance between the hooks of the bow tower crane and the stern tower crane. S2, the bow tower crane (9) and the stern tower crane (10) move the main unit (1) above its installation position; S3, the bow tower crane (9) and the stern tower crane (10) synchronously and slowly lower the main unit (1) until the bottom of the main unit (1) is at the first height from the main unit panel (13) and then stop lowering; S4, the bow crane (9) remains stationary and the stern crane (10) slowly descends, so that the tilt angle of the main engine (1) is equal to the slope of the tilting slipway (2); S5, the bow tower crane (9) and the stern tower crane (10) fall down simultaneously, positioning the main unit (1) on the main unit panel (13).

2. The method for hoisting the main engine on an inclined slipway according to claim 1, characterized in that, The wire rope (11) includes an upper section, a middle section, and a lower section. In step S1, the specific steps for connecting the hoisting bar (3) to the bow tower crane, stern tower crane, and main engine hoisting hole (12) using steel wire rope (11) are as follows: Calculate the hoisting safety distance of the main unit (1). Based on the tower crane lifting height and the hoisting safety distance of the main unit (1), calculate the maximum total length of the wire rope. The appropriate length of each section of wire rope is provided according to the maximum total length of the wire rope and the height of the hoisting block (3); The hooks of the bow tower crane and the stern tower crane are connected to the upper lifting lugs (7) on the left and right sides of the connecting block (3) using the upper section of steel wire rope respectively; Install two shackles on the lower lifting lug (8), and install two folded middle section steel wire ropes on each shackle; Install a shackle at each end of each middle section of the wire rope, connect a lower section of the wire rope to each shackle, and fix the lower ends of each lower section of the wire rope in the corresponding lifting hole (12) on the main machine (1).

3. The method for hoisting the main engine on an inclined slipway according to claim 2, characterized in that, The maximum total length of the wire rope is L = H - H1, where H is the lifting height of the tower crane and H1 is the safe distance for hoisting the main unit (1). The safe distance for hoisting the main unit (1) refers to the safe distance required from the hoisting hole (12) of the main unit to the ground when the main unit is hoisted.

4. The method for hoisting the main engine on an inclined slipway according to claim 1, characterized in that, In step S2, the specific steps for the bow and stern tower cranes to move the main unit (1) above its installation position are as follows: The bow tower crane and the stern tower crane are lifted synchronously. After the main unit (1) is lifted vertically to the second height above the ground, observe whether there is any abnormality. If there is no abnormality, continue to lift the main unit (1) vertically until the bottom of the main unit (1) is higher than the stern structure (14). When the bottom of the main unit (1) is higher than the stern structure (14), the vertical lifting is stopped, and the bow tower crane and the stern tower crane are moved synchronously along their respective tracks until the main unit (1) is moved above its installation position.

5. The method for hoisting the main engine on an inclined slipway according to claim 1, characterized in that, In step S5, as the bow and stern tower cranes descend synchronously, the relative height of the hooks of the bow and stern tower cranes is continuously adjusted to ensure the tilt angle of the main unit (1) and to ensure the accurate installation and positioning of the main unit (1).

6. The method for hoisting the main engine on an inclined slipway according to claim 1, characterized in that, The connecting hoist (3) includes a hoist body (4), two sets of upper hoisting lugs (7) symmetrically arranged along the longitudinal center line of the hoist body (4), and a lower hoisting lug (8) arranged in the middle of the hoist body (4). Each set of upper hoisting lugs (7) includes two upper hanging plates symmetrically arranged along the transverse center line of the hoist body (4). Each upper hanging plate has two hanging holes. The lower hoisting lug (8) has two hanging holes.

7. The method for hoisting the main engine on an inclined slipway according to claim 1, characterized in that, An upper reinforcing web (5) is fixed on the plate surface around the lifting hole of the upper hanging plate, and a lower reinforcing web (6) is fixed on the plate surface around the lifting hole of the lower lifting lug (8).

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