Installation method of large ship tail shaft

Abstract

The invention discloses an installation method of a large ship tail shaft. The installation method comprises the following steps that S1, an installation platform is erected outside a cabin, and a dragging rail is arranged; s2, arranging a special mounting trolley according to the structural characteristics, the weight and the gravity center of the tail shaft; s3, the tail shaft is placed on a mounting trolley, and the position of the shaft is adjusted through a jackscrew on the mounting trolley; s4, an electric hoist is used for dragging the stern shaft, fine adjustment is conducted on the installation trolleys in good time, when the first installation trolley reaches the end of the stern ball, dragging is stopped, an auxiliary hanging belt is installed, and the hoist is tensioned to enable the hanging belt to be stressed; s5, a jackscrew of the first installation trolley is loosened, the first installation trolley is moved to the position in front of the gravity center of the stern shaft, the stern shaft continues to be dragged, and when the trolley is close to the end face of the stern ball, the first installation trolley is detached after being split; s6, the penetrating shaft continues to be dragged, and the stern shaft is dragged into the shaft sleeve; and S7, after the tail shaft penetrates into the cabin, the tail shaft is dragged in place through a third mounting trolley in the cabin, a second mounting trolley outside the cabin and an auxiliary hanging belt.

Description

Technical Field

[0001] The present invention relates to the technical field of ship equipment installation, and more specifically, to an installation method for a stern shaft of a large ship. Background Art

[0002] During the shipbuilding process, the installation of the stern shaft is an important task in the dock construction stage. For large ships, the stern shaft is long and heavy, and the assembly precision requirements are high. How to install the stern shaft quickly and accurately will be particularly important.

[0003] The patent with the authorization announcement number CN 109204692 B discloses a method for installing a ship's stern shaft, which uses the method of passing the stern shaft from the engine room to the outside of the engine room, and is suitable for shafts without a hub at the tail end of the stern shaft. The flexible guide device mentioned in this authorized patent is relatively cumbersome, the inflation and pressure adjustment operation is complicated, the tooling consumables are large, and the preparation cycle is long.

[0004] Authorization announcement number CN 105966549 B discloses a ship stern shaft installation device, in which the installation method mentioned is suitable for the installation of a stern shaft with a propeller. It has high production costs and is not universal. The tooling used is large in size and weight, and installation and disassembly are relatively troublesome and require the cooperation of a crane. Summary of the invention

[0005] The present invention aims to solve the problems of the existing stern shaft installation device being high in cost, difficult to install and disassemble, and the stern shaft installation method being time-consuming, complicated to operate, and not universal. The present invention provides a large-scale installation method for large ships. Specifically, a working platform is set up at the stern of the ship in advance, and two parallel horizontal tracks are installed on the platform. A special installation trolley is arranged according to the structural characteristics, weight, and center of gravity of the stern shaft, and the stern shaft is hoisted onto the installation trolley. By adjusting the threaded top screw (fine thread) on the trolley, the stern shaft axis is made consistent with the axis of the entire hull. Then use the electric hoist to drag the stern shaft to move. After the stern shaft enters the stern tube, always monitor the symmetry of the gap between the stern shaft and the stern tube, and make fine adjustments to the trolley in time. When the first installation trolley reaches the end of the stern ball, stop dragging, install the auxiliary sling, and tighten the hoist to make the sling bear force, then loosen the bolt top screw of the first installation trolley, and move the trolley to the position of the center of gravity of the stern shaft, and continue to drag the stern shaft. When the trolley approaches the end face of the stern ball, unload the force of the top screw of this trolley, and then remove each part separately. Use the second installation trolley and auxiliary sling to align the stern shaft, and continue to drag the through shaft. Before the center of gravity of the stern shaft approaches the lifting point, the front end of the stern shaft The fake shaft has been placed on the pre-arranged third installation trolley. At this time, adjust the height of the trolley so that the stern shaft does not contact the tungsten gold sleeve. Continue to drag the stern shaft, and when the second installation is almost in contact with the auxiliary sling, stop the car and remove the second installation trolley. Then, use the trolley and auxiliary sling in the cabin to adjust the stern shaft. After the stern shaft is dragged into place, remove the auxiliary sling and the third installation trolley in turn.

[0006] In order to achieve the above object, a method for installing a stern shaft of a large ship comprises the following steps:

[0007] S1. Build an installation platform outside the ship's cabin facing the stern tube;

[0008] S2, arranging the second installation trolley, the first installation trolley, the third installation trolley and the electric hoist in parallel in sequence along the axis direction of the stern tube; wherein the first installation trolley and the second installation trolley are arranged on the installation platform, the electric hoist is arranged outside the ship cabin away from the stern tube, and the third installation trolley is arranged inside the ship cabin;

[0009] S3, placing the stern shaft on the first installation trolley and the second installation trolley, adjusting the first installation trolley and the second installation trolley so that the axis of the stern shaft and the axis of the stern tube are located on the same horizontal straight line; wherein the first installation trolley is located between the bow end of the stern shaft and the center of gravity of the stern shaft, and the second installation trolley is located at the stern end of the stern shaft;

[0010] S4. Install a towing sling at the stern end of the stern shaft, connect the electric hoist and the towing sling together, make the lifting line of the electric hoist and the axis of the stern tube at the same horizontal height, start the electric hoist, pull the first installation trolley, the second installation trolley and the stern shaft to move synchronously toward the stern tube, stop towing when the first installation trolley moves to the end of the stern ball, install an auxiliary sling between the first installation trolley and the end of the stern ball to hold the bottom of the stern shaft, and fix the auxiliary sling at a high point;

[0011] S5, move the first installation trolley backward to a position in front of and close to the center of gravity of the stern shaft, continue to drag the stern shaft toward the stern tube, and when the first installation trolley moves close to the auxiliary sling, stop dragging and remove the first installation trolley;

[0012] S6. Drag the stern shaft toward the stern tube. When the bow end of the stern shaft passes through the stern tube and falls into the ship cabin, stop dragging, place the third installation trolley below the bow end of the stern shaft, and adjust the height of the third installation trolley so that the third installation trolley supports the stern shaft and does not contact the stern tube bearing.

[0013] S7, drag the stern shaft toward the stern tube. When the second installation trolley moves close to the auxiliary sling, stop dragging, remove the second installation trolley, and then drag the stern shaft to the predetermined installation position, and remove the towing sling, the auxiliary sling and the third installation trolley.

[0014] In a preferred embodiment, a guardrail is provided on the outer periphery of the installation platform.

[0015] In a preferred embodiment, two towing tracks for limiting the movement of the first installation trolley and the second installation trolley are laid on the installation platform.

[0016] In a preferred embodiment, the first installation trolley, the second installation trolley and the third installation trolley have the same structure and are height-adjustable.

[0017] In the preferred embodiment, before starting the electric hoist in step S4, a dummy shaft is installed at the bow end of the stern shaft, and in step S6, a third installation trolley is placed below the dummy shaft.

[0018] In the preferred embodiment, after the stern shaft is dragged to the predetermined installation position in step S7, the dummy shaft is removed.

[0019] In the preferred embodiment, during steps S4 to S7, the position change of the stern shaft is monitored. When the stern shaft axis deviates from the linear position of the stern tube axis, the position of the stern shaft is adjusted so that the stern shaft axis and the stern tube axis are located on the same horizontal straight line.

[0020] In a preferred embodiment, in step S3, the position where the first mounting trolley is installed is symmetrical to the center of gravity of the second mounting trolley about the stern shaft.

[0021] Beneficial effects of the present invention

[0022] 1. The installation trolley used in the present invention is a modular trolley, which can be dismantled in parts during dismantling. Each part is light in weight and can be moved by manpower. It is easy to operate when the construction space is limited.

[0023] 2. When adjusting the left and right and up and down positions of the stern shaft, the present invention adopts a fine-pitch thread top screw for adjustment, which has high fine-tuning accuracy, simple operation and good stability.

[0024] 3. The present invention sets a dummy shaft at the bow end of the stern shaft, which can cooperate with the third installation trolley, effectively avoiding the contact between the stern shaft and the tungsten gold sleeve, and ensuring the smooth transition between the shaft shoulder and the end face of the shaft sleeve.

[0025] 4. The present invention is provided with an auxiliary sling on the end surface of the stern ball, which can ensure that the stern shaft remains stable when the stern trolley is removed, avoiding the stern shaft from contacting with the tungsten gold sleeve and excessive local force; the two ends of the sling are arranged at different rib positions, which not only improves the stability of the sling, but also facilitates the adjustment of the stern shaft position.

[0026] 5. The stern shaft installation method of the present invention can be applied to the installation of large-scale stern shafts with a hub on ships, and is particularly suitable for the installation of stern shafts from outside the cabin to inside the cabin. The operation is simple, the alignment is easy, and the dragging is convenient. This method effectively avoids the contact between the stern shaft and the tungsten gold sleeve, ensures the smooth transition between the shaft shoulder and the end face of the sleeve, and can effectively improve the installation efficiency and installation accuracy of the stern shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the bow end of the stern shaft penetrating into the stern tube of the present invention;

[0028] Figure 2 is a schematic diagram of the installation platform of the present invention;

[0029] Figure 3 It is a schematic diagram of the initial placement position of the stern shaft in the installation method of the present invention;

[0030] Figure 4 It is a schematic diagram of installing the auxiliary sling when the first installation trolley moves to the bow of the stern bulb in the installation method of the present invention;

[0031] Figure 5 This is a schematic diagram of the first installation trolley in the installation method of the present invention in a backward moving state;

[0032] Figure 6 It is a schematic diagram of the installation of the stern shaft after the first installation trolley is removed by the installation method of the present invention;

[0033] Figure 7 This is a schematic diagram of the third installation trolley connected to the stern shaft in the installation method of the present invention;

[0034] Figure 8 It is a schematic diagram of the stern shaft reaching a predetermined installation position according to the installation method of the present invention;

[0035] Fig. 9 It is a schematic diagram of the overall structure of the installation trolley.

[0036] 1-installation platform; 2-drag track; 3-guardrail; 4-stern shaft; 5-installation trolley; 6-drag sling; 7-auxiliary sling; 8-electric hoist; 9-dummy shaft; 10, stern ball; 11, stern tube; 12-hook; 13-stern shaft center of gravity; 14-hub; 5a-first installation trolley; 5b-second installation trolley; 5c-third installation trolley; A-removal of the first installation trolley. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0038] The invention relates to a method for installing a stern shaft of a large ship, and a split detachable trolley is used to insert the stern shaft 4 from outside a cabin into a cabin. The method comprises the following process steps: step 1, setting up an installation platform 1 outside the cabin, arranging a towing track 2, and setting up guardrails 3 around the platform; step 2, arranging a special installation trolley 5 according to the structural characteristics, weight and center of gravity of the stern shaft 4; step 3, placing the stern shaft 4 on the installation trolley 5, and adjusting the position of the shaft by using the top screw on the installation trolley 5; step 4, using an electric hoist 8 to tow the stern shaft 4, and making fine adjustments to the installation trolley 5 in time, when the first installation trolley 5a reaches the end of the stern ball 10, stopping towing, installing the auxiliary sling 7, and tightening the hoist to make the sling stressed; step 5, loosening the top screw of the first installation trolley 5a, and moving the first installation trolley 5a to the position of the center of gravity of the stern shaft 4, continuing to tow the stern shaft 4, and when the trolley approaches the end face of the stern ball 10, splitting the first installation trolley 5a and removing it. Step 6: Continue to drag the shaft through, so that the stern shaft 4 can be smoothly dragged into the shaft sleeve; Step 6: After the stern shaft is inserted into the cabin, use the third installation trolley 5c in the cabin and the second installation trolley 5b outside the cabin and the auxiliary sling to drag the stern shaft into place. After the installation is completed, remove the installation trolley 5 and the sling.

[0039] like Fig. 9 As shown, the mounting trolley 5 includes a vehicle body 16, an adjusting body 15 and a support body 14. The bottom of the vehicle body 16 is provided with four small wheels at four corners, and the top of the vehicle body 16 is provided with four first blocks, and the four blocks are distributed in a rectangular shape; the adjusting body 15 is arranged between the four first blocks at the top of the vehicle body 16, and the four corners of the adjusting body 15 are respectively provided with second blocks, and the four first blocks are all provided with a first through hole, and a first threaded top screw is installed in the first through hole, and the first threaded top screw abuts against the second block. By adjusting the first threaded top screw, the adjusting body 15 can be adjusted in the length of the vehicle body 16 The position in the degree direction, a support body 14 is arranged on the adjusting body 15, the support body 14 is fixed on the base, and second through holes are arranged on the four corners of the base respectively, and second threaded top screws are installed in the second through holes, and the second threaded top screws abut against the adjusting body 15. By adjusting the second threaded top screws, the height of the support body 14 can be changed; the upper surface of the support body 14 is a concave arc shape, the arc shape is adapted to the shape of the lower surface of the stern shaft, the tangent direction of the arc shape is the same as the length direction of the vehicle body 16, and the moving direction of the vehicle body 16 is the same as the width direction of the vehicle body 16.

[0040] When in use, the stern shaft 4 is hoisted onto a plurality of installation trolleys 5, and the stern shaft is adjusted up and down and left and right by screwing the first bolt top screw and the second bolt top screw on the installation trolley 5 so that the axis coincides with the ship installation axis.

[0041] Example 1

[0042] A method for installing a stern shaft of a large ship comprises the following steps:

[0043] Step 1: Figure 2 As shown, an installation platform 1 is set up outside the ship cabin, and a towing track 2 is arranged, and a guardrail 3 is set up around the platform. Requirements: The platform strength meets the strength requirements, the two tracks are horizontal and parallel, and the center line of the track coincides with the axis.

[0044] Step 2: Arrange the special installation trolley 5 according to the structural characteristics, weight and center of gravity of the stern shaft 4. The second installation trolley 5b is installed near the hub 14, and the first installation trolley 5a is installed symmetrically with respect to the center of gravity of the stern shaft 4.

[0045] Step 3: Figure 3 As shown, the stern shaft 4 is placed on the installation trolley 5, the dummy shaft 9 is installed to the bow end of the stern shaft 4, and the position of the shaft is adjusted using the top screw on the installation trolley 5 so that the axis of the stern shaft is consistent with the axis of the entire hull.

[0046] Step 4: Figure 4 As shown, the electric hoist 8 is used to drag the stern shaft 4 to move, and the symmetry of the gap between the stern shaft 4 and the stern tube 11 should be monitored at all times, and the first installation trolley 5a and the second installation trolley 5b should be fine-tuned in time. When the first installation trolley 5a reaches the end of the stern ball 10, the dragging is stopped, the auxiliary sling 7 is installed, and it is tightened to make the sling stressed, and then the threaded top screw of the first installation trolley 5a is loosened.

[0047] Step 5: Figure 5 As shown, the first installation trolley 5a is moved to the position before the center of gravity of the stern shaft 4, and the stern shaft 4 is continued to be dragged. When the first installation trolley 5a approaches the auxiliary sling 7, as shown in FIG. Figure 6 As shown, the threaded top screw at the top of the first installation trolley 5a is unloaded and then removed separately, and the force on the auxiliary sling 7 is adjusted while being removed to keep the stern shaft 4 centered.

[0048] Step 6: Figure 7 As shown, the stern shaft 4 is aligned by using the second installation trolley 5b and the auxiliary sling 7, and the stern shaft 4 is continued to be dragged and the dummy shaft 9 at the bow end of the stern shaft 4 has been placed on the pre-arranged third installation trolley 5c before the center of gravity of the stern shaft 4 approaches the lifting point. At this time, the height of the third installation trolley 5c is adjusted so that the stern shaft 4 does not contact the tungsten gold sleeve.

[0049] Step 7: Continue to drag the shaft. When the second installation trolley 5b is close to the auxiliary sling 7, stop the car, unload the threaded top screw on the top of the second installation trolley 5b, and then remove it separately. Use the third installation trolley 5c and the auxiliary sling 7 in the cabin to adjust the stern shaft 4. After centering, continue to drag it until the stern shaft 4 reaches the predetermined position. Figure 8 As shown, the auxiliary sling 8 is then removed, the third installation trolley 5c in the ship cabin is removed, the dummy shaft 9 is removed, and the installation is completed.

[0050] Comparative Example 1

[0051] The patent with the authorization announcement number CN 109204692 B discloses a method for installing a ship's stern shaft. This installation method uses the stern shaft to pass through the cabin from the inside to the outside of the cabin, which is suitable for shafts without a hub at the tail end of the stern shaft. The present invention is suitable for stern shafts with a hub that cannot pass through the cabin and can only pass through the cabin from outside the cabin. In addition, the flexible guide device mentioned in this authorized patent is relatively cumbersome, the inflation and pressure adjustment operation is complicated, the tooling consumables are large, and the preparation cycle is long. In comparison, the present invention is simpler, more reliable, and more applicable.

[0052] Comparative Example 2

[0053] The authorization announcement number CN 105966549 B discloses a ship stern shaft installation device, in which the installation method mentioned is applicable to the installation of a stern shaft with a paddle, which is different from the present invention, which is applicable to the installation without a paddle stern shaft. The tooling form used in this authorized patent is also different from the tooling form of the present invention. The authorized patent uses a supporting trolley and a guiding trolley, and the two trolleys have different structures and functions. The two installation trolleys used in the present invention have the same structure and can play a supporting and adjusting role. The adjustment form used in this authorized patent is also different from the present invention. This authorized patent uses a driving jacking frame and a retractable transverse drive to adjust the stern shaft position, while the present invention uses all threaded top screws for adjustment. Both methods can achieve the adjustment effect, but in terms of production cost and versatility, the present invention is better. In addition, the tooling used in the authorized patent is large in size and heavy in weight, and installation and disassembly are more troublesome, requiring the cooperation of a crane, while the tooling used in the present invention is small in size and light in weight, and installation and disassembly are relatively simple and can be achieved by manpower.

[0054] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for installing a stern shaft of a large ship, characterized in that: The steps include: S1. Building a mounting platform (1) outside the ship cabin at a position facing the stern tube (11); S2, arranging the second installation trolley (5b), the first installation trolley (5a), the third installation trolley (5c) and the electric hoist (8) in parallel and in sequence along the axis direction of the stern tube (11); wherein the first installation trolley (5a) and the second installation trolley (5b) are arranged on the installation platform (1), the electric hoist (8) is arranged outside the ship cabin and away from the stern tube (11), and the third installation trolley (5c) is arranged inside the ship cabin; S3, placing the stern shaft (4) on the first installation trolley (5a) and the second installation trolley (5b), and adjusting the first installation trolley (5a) and the second installation trolley (5b) so that the axis of the stern shaft (4) and the axis of the stern tube (11) are located on the same horizontal straight line; wherein the first installation trolley (5a) is located between the bow end of the stern shaft (4) and the center of gravity (13) of the stern shaft, and the second installation trolley (5b) is located at the stern end of the stern shaft (4); S4, installing a towing sling (6) at the stern end of the stern shaft (4), connecting the electric hoist (8) and the towing sling (6) together, making the suspension line of the electric hoist (8) and the axis of the stern tube (11) at the same horizontal height, starting the electric hoist (8), pulling the first installation trolley (5a), the second installation trolley (5b) and the stern shaft (4) to move synchronously toward the stern tube (11), when the first installation trolley (5a) moves to the end of the stern ball (10), stopping the towing, installing an auxiliary sling (7) between the first installation trolley (5a) and the end of the stern ball (10) to support the bottom of the stern shaft (4), and fixing the auxiliary sling (7) at a high point; S5, moving the first installation trolley (5a) backward to a position in front of the center of gravity of the stern shaft (13) and close to the center of gravity of the stern shaft (4), and continuing to drag the stern shaft (4) toward the stern tube (11). When the first installation trolley (5a) moves close to the auxiliary sling (7), stop dragging and remove the first installation trolley (5a); S6, dragging the stern shaft (4) toward the stern tube (11), and when the bow end of the stern shaft (4) passes through the stern tube (11) and enters the ship cabin, stopping the dragging, placing the third installation trolley (5c) below the bow end of the stern shaft (4), and adjusting the height of the third installation trolley (5c) so that the third installation trolley (5c) supports the stern shaft (4) and does not contact the stern tube bearing; S7, dragging the stern shaft (4) toward the stern tube (11), and when the second installation trolley (5b) moves close to the auxiliary sling (7), stopping the dragging, removing the second installation trolley (5b), and then dragging the stern shaft (4) to a predetermined installation position, and removing the towing sling (6), the auxiliary sling (7) and the third installation trolley (5c).

2. The method for installing a stern shaft of a large ship according to claim 1, characterized in that: A guardrail (3) is provided on the outer periphery of the installation platform (1).

3. The method for installing a stern shaft of a large ship according to claim 1, characterized in that: Two towing tracks (2) for limiting the movement of the first installation trolley (5a) and the second installation trolley (5b) are laid on the installation platform (1).

4. The method for installing a stern shaft of a large ship according to claim 1, characterized in that: The first installation trolley (5a), the second installation trolley (5b) and the third installation trolley (5c) have the same structure and are height-adjustable.

5. The method for installing a stern shaft of a large ship according to claim 1, characterized in that: In step S4, before starting the electric hoist (8), a dummy shaft (9) is installed at the bow end of the stern shaft (4), and in step S6, a third installation trolley (5c) is placed below the dummy shaft (9).

6. The method for installing a stern shaft of a large ship according to claim 5, characterized in that: Step S7: After the stern shaft (4) is dragged to the predetermined installation position, the dummy shaft (9) is removed.

7. The method for installing a stern shaft of a large ship according to claim 1, characterized in that: During steps S4 to S7, the position change of the stern shaft (4) is monitored. When the axis of the stern shaft (4) deviates from the straight line position where the axis of the stern tube (11) is located, the position of the stern shaft (4) is adjusted so that the axis of the stern shaft (4) and the axis of the stern tube (11) are located on the same horizontal straight line.

8. The method for installing a stern shaft of a large ship according to claim 1, characterized in that: Step S3: the first installation trolley (5a) is installed at a position symmetrical to the second installation trolley (5b) about the center of gravity of the stern shaft (4).

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