A method for installing a hydraulic coupling inside a shaft sleeve

Abstract

The present invention relates to the technical field of the installation of large couplings, and particularly to a method for installing a hydraulic coupling in a shaft sleeve. A first manhole, a second manhole, a third manhole, a fourth manhole, and a fifth manhole are opened on the shaft sleeve. A rail trolley is designed, which is guided by the T-shaped profile inside the shaft sleeve, transports the hydraulic coupling inside the shaft sleeve, and has a stopping function. By hanging a hoist on the rigging, after leveling, the hydraulic coupling is moved to the position of the fourth manhole inside the shaft sleeve. By using the rail trolley, manholes, rigging, hanging beam, and hoist sling, the shaft sleeve can be pre-placed in an appropriate position and fixed before hoisting the shaft sleeve. Subsequently, when connecting the tail pipe shaft and the propeller shaft through the hydraulic coupling, the hanging beam can also adjust the heights and horizontal angles of the hydraulic connecting shaft, the propeller shaft, and the tail pipe shaft, facilitating centering when connecting the propeller shaft and the tail pipe shaft, improving the installation accuracy, and providing convenience for the installation.

Description

[0001] The present invention relates to the technical field of the installation of large hydraulic couplings, and particularly to a method for installing a hydraulic coupling within a shaft protection sleeve. Background Art

[0002] The original structure in which the original shaft between the propeller shaft and the stern tube shaft was immersed in water is connected by a shaft protection sleeve (connected by a hydraulic coupling) and changed to a closed structure. This means that the tail shaft (ø675*L14000) and the stern tube shaft (ø645*L14000) must be connected within the shaft protection sleeve, and the axis of this shafting forms an angle of 2.0272° with the baseline, which increases the construction difficulty significantly.

[0003] Also, considering the influence of the welded connection of the shaft protection sleeve on the shafting, the installation of the tail bearing and the stern tube bearing is arranged after the installation of the shaft protection sleeve. From the perspective of the physical dimensions, the hydraulic coupling and the stern tube bearing must be pre-placed at appropriate positions within the shaft protection sleeve before the installation of the shaft protection sleeve.

[0004] However, when the hydraulic coupling connecting the propeller shaft and the tail shaft is pre-lifted and fixed within the shaft protection sleeve in advance, since the hydraulic coupling is a large workpiece with a large volume and heavy weight, it is difficult to lift the huge hydraulic coupling into the shaft protection sleeve and pre-fix it to the predetermined position. At the same time, when the hydraulic coupling is sleeved onto the stern tube shaft, it is also difficult to adjust the height and horizontal angle of the hydraulic coupling, which brings inconvenience to connecting the propeller shaft and the stern tube shaft (the clearance between the ø900*L1700 coupling and the shaft is only 0.16 mm). Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a method for installing a hydraulic coupling within a shaft protection sleeve to solve the problem that before the hoisting of the shaft protection sleeve, the hydraulic coupling must be pre-lifted and fixed within the shaft protection sleeve in advance. Since the hydraulic coupling is a large workpiece with a large volume and heavy weight, and the operation is within the shaft protection sleeve, it is inconvenient for hoisting, shifting, and centering.

[0006] Based on the above purpose, the present invention provides a method for installing a hydraulic coupling within a shaft protection sleeve, including the following steps:

[0007] The first step: Open manholes. Open a first manhole, a second manhole, a third manhole, a fourth manhole, and a fifth manhole on the shaft protection sleeve. And manhole covers are installed in all the above manholes. When the manhole covers are opened, it is convenient for constructors and tooling to enter and exit the manholes for construction.

[0008] The second step: Design a rail trolley. This rail trolley can be guided by the T-shaped profile inside the shaft protection sleeve to facilitate the transportation of the hydraulic coupling within the shaft protection sleeve. And the rail trolley has a stopping function. The movement of the stern tube bearing within the shaft protection sleeve also needs to be transported by the rail trolley. The rail trolley is composed of two moving wheel frames.

[0009] Step 3: When hoisting the hydraulic coupling into the shaft guard sleeve, first install two movable wheel frames at both ends of the hydraulic coupling respectively, so that the two movable wheel frames are fixed to the hydraulic coupling to form a movable trolley. The hoist is suspended on the hydraulic coupling, and then the hoist is suspended on the crane. After leveling, the hydraulic coupling is moved to a position slightly behind the No. 4 manhole in the shaft guard sleeve (i.e., the predetermined position, with space left in front for placing and working on the tail pipe bearing), and the hydraulic coupling is fixed by using the stopping function of the rail trolley.

[0010] Step 4: Subsequently, lift the shaft guard sleeve by an external crane and weld it to the hull, then install the tail pipe bearing. After installing the tail pipe bearing, install the tail pipe shaft. Before the tail pipe shaft is installed in place (i.e., at the No. 3 manhole), the rail trolley on the hydraulic coupling needs to be removed. When removing the rail trolley, at this time, lift the hydraulic coupling by the lifting beam and move the hydraulic coupling to a position close to the end position (between the No. 3 and No. 4 manholes) to facilitate removing the removed rail trolley from the manhole.

[0011] Step 5: When installing the tail pipe shaft, first insert the tail pipe shaft into the shaft guard sleeve, and measure the horizontal angle of the shaft. Adjust the horizontal angle of the (trolley track) on the lifting beam to be consistent with the shaft.

[0012] Step 6: Continue to move the hydraulic coupling through the lifting beam, and use the same angle between the lifting beam and the shaft to coaxially translate the hydraulic coupling to a position close to the No. 3 manhole, so that its port is close to the shaft end of the tail pipe shaft. If there is jamming, use a feeler gauge to check the clearance orientation, and finely adjust the force of the hoist to sleave the hydraulic coupling on the tail pipe shaft.

[0013] Subsequently, insert the propeller shaft into the shaft guard sleeve and move the propeller shaft until the two shaft ends are close. At the No. 4 manhole and the No. 5 manhole, the height and horizontal angle of the propeller shaft can be adjusted by using the hoist. At the No. 1 manhole, the tail pipe shaft can also be adjusted by using the hoist to align the two shaft ends. Control the deviation of offset and twist within 0.02 mm. For this alignment here, two specially designed embedded adjusting supports are provided below the No. 4 manhole. The adjusting support includes a jacking seat embedded in the shaft guard sleeve, and a jacking bolt is threadedly connected in the jacking seat, which can play its role in adjusting and stabilizing.

[0014] Step 7: After the two shafts are aligned, clean and report to the shipowner and the ship inspection. Slide the coupling backward so that half of the hydraulic coupling is wrapped on the propeller shaft and half on the tail pipe shaft. After confirming the correct position, use a high-pressure oil pump to pressurize the hydraulic coupling radially and axially and make records to connect the two shafts into one body. Since the distance between the hydraulic coupling and the manhole door is small, the joint connecting the hydraulic oil pipe to the oil hole of the coupling is designed in a right-angle form.

[0015] Preferably, in the second step, a through groove adapted to the T-shaped profile inside the shaft protection sleeve is formed at the bottom of the moving wheel frame, and two rollers are provided at the bottom of the moving wheel frame, and the rollers are in contact with the inner wall of the shaft protection sleeve;

[0016] The top of the moving wheel frame is an arc surface that fits the hydraulic coupling, and a rubber pad is bonded inside the arc surface. A retaining piece is fixedly connected to the end of the moving wheel frame, and a mounting hole is provided in the retaining piece. A bolt is provided in the mounting hole, and the retaining piece can be fixed to the end of the hydraulic coupling through the bolt.

[0017] Preferably, in the second step, a hole plate is fixedly connected to the moving wheel frame. A locking bolt is threadedly connected to the hole plate, and a threaded hole adapted to the locking bolt is formed at the top of the T-shaped profile. When it is necessary to fix the hydraulic coupling inside the shaft protection sleeve, the hydraulic coupling can be limited and fixed through the locking bolt.

[0018] Preferably, in the third step, a first lifting point and a third lifting point are respectively provided at both ends of the hydraulic coupling, and a second lifting point is provided at the outer circumference of the middle part of the hydraulic coupling.

[0019] Preferably, in the third step, when the hydraulic coupling is lifted into the shaft protection sleeve, two lifting points are used. That is, the third lifting point at the end of the hydraulic coupling is selected in the front, and the second lifting point on the outer circumference of the hydraulic coupling is used in the back. Hang the hoist on the crane. After leveling, move the rear section (i.e., the end provided with the first lifting point) of the hydraulic coupling into the shaft protection sleeve. The crane gently lowers, and the hoist also cooperates to lower, so that one of the rollers on the rail trolley presses against the inner wall of the shaft protection sleeve. Continue to loosen the hoist, and the crane continues to move the hydraulic coupling into the sleeve until the roller at the other end of the rail trolley presses against the inner wall of the shaft protection sleeve; Use the prepared hoist inside the shaft protection sleeve to pull inward, and at the same time do a good job in inertia protection; Remove the hoisted hoist, slide the coupling to the predetermined position, and fix it.

[0020] Preferably, in the fourth step, when the tail pipe shaft is shifted and installed at the third manhole, hang a hoist on the second lifting point of the hydraulic coupling, unscrew the locking bolt to release the fixation of the hydraulic coupling, and then lift the hydraulic coupling through the hoist and move the hydraulic coupling between the third and fourth manholes, which is convenient for construction personnel to enter the manhole to remove the rail trolley and move the rail trolley out of the manhole.

[0021] Preferably, in the fifth step, before inserting the tail pipe shaft, a copper sleeve is detachably installed at the end of the tail pipe shaft, and the copper sleeve has a guiding taper. The length of the hydraulic coupling is 1700 mm. When the end of the tail pipe shaft is about 600 mm away from the hydraulic coupling, stop inserting the shaft, and make a mark at a position 900 mm away from the end of the tail pipe shaft;

[0022] Subsequently, measure the horizontal angle of the tail pipe shaft. The angle can be measured with a horizontal angle gauge. Adjust the horizontal angle of the hanging beam to be the same as that of the shaft, and then move the hydraulic coupling so that its port is close to the shaft end. Adjust the height and horizontal angle of the hydraulic coupling to fit the shaft. Arrange a person inside the shaft sleeve to observe the surrounding clearance and adjust it evenly. Slowly move the hydraulic coupling onto the tail pipe shaft. During the process, the hoist can be manually pushed to sway left and right, and the lifting height can be finely adjusted as needed. Proceed step by step to complete the installation of the hydraulic coupling onto the tail pipe shaft.

[0023] Preferably, in the sixth step, remove the copper sleeve at the end of the tail pipe shaft, clean the shaft end of the tail pipe shaft. After the propeller shaft is inserted, check and clean it. Make a mark on the propeller shaft 800 mm from its shaft end. Then move the propeller shaft so that the two shaft ends are close to each other.

[0024] Advantages of the present invention: The installation method of the hydraulic coupling inside the shaft sleeve (in a limited space) provided by the present invention can pre-place and fix the shaft sleeve in an appropriate position before hoisting the shaft sleeve by using a rail trolley, manhole, hoist, and hanging beam. Subsequently, when connecting the tail pipe shaft and the propeller shaft through the hydraulic coupling, the tail pipe shaft and the propeller shaft can be hoisted by the hanging beam and the hoist. At the same time, when the hydraulic coupling is sleeved on the tail pipe shaft, the hanging beam can also adjust the height and horizontal angle of the hydraulic connection shaft, the propeller shaft, and the tail pipe shaft, facilitating the centering during the connection of the propeller shaft and the tail pipe shaft. Through the temporary support, i.e., the jacking bolt, preset in the shaft sleeve, the propeller shaft can be supported and the height and horizontal angle of the propeller shaft can be finely adjusted, solving the stability problem of the suspended propeller shaft during the centering process, improving the installation accuracy, and providing convenience for the installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 It is a partial cross-sectional view of the rail trolley and the hydraulic coupling located inside the shaft sleeve in the embodiment of the present invention;

[0027] Figure 2 It is a cross-sectional view taken along line A-A in the embodiment of the present invention;

[0028] Figure 3 It is a schematic structural diagram of the shaft sleeve in the embodiment of the present invention;

[0029] Figure 4 It is a schematic structural diagram of the end of the first lifting point on the hydraulic coupling in the embodiment of the present invention being moved into the shaft sleeve;

[0030] Figure 5 This is a schematic structural view of the end of the third lifting point on the hydraulic coupling in the embodiment of the present invention being transferred into the shaft protecting sleeve;

[0031] Figure 6 This is a schematic structural view of the propeller shaft and the tail pipe shaft being connected through the shaft protecting sleeve in the embodiment of the present invention;

[0032] Figure 7 This is a cross-sectional view taken at B-B in the embodiment of the present invention.

[0033] In the figure: 1. Shaft protecting sleeve; 2. Hydraulic coupling; 21. First lifting point; 22. Second lifting point; 23. Third lifting point; 3. Moving wheel frame; 31. Roller; 32. Rubber pad; 33. Retaining piece; 34. Locking bolt; 4. Tail pipe bearing; 5. First manhole; 6. Second manhole; 7. Third manhole; 8. Fourth manhole; 9. Fifth manhole; 10. Hoist; 11. Tail pipe shaft; 12. Propeller shaft; 15. Jacking seat; 16. Jacking bolt. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to specific embodiments and the accompanying drawings.

[0035] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention should have the ordinary meanings understood by those with ordinary skills in the field to which the present invention pertains. The "first", "second" and similar terms used in the present invention do not indicate any sequence, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0036] Such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7As shown in the figure, a method for installing a hydraulic coupling inside a shaft sleeve protector. First, considering the impact of the installation of the shaft sleeve protector 1 (which is welded) on the shafting system, the installation of the stern bearing and the tailshaft tube bearing is arranged after the installation of the shaft sleeve protector 1. From the perspective of the physical dimensions, the hydraulic coupling 2 and the tailshaft tube bearing 4 must be pre-placed in appropriate positions inside the shaft sleeve protector 1 before the installation of the shaft sleeve protector 1. The specific steps are as follows:

[0037] The first step: Open manholes. Open a first manhole 5, a second manhole 6, a third manhole 7, a fourth manhole 8, and a fifth manhole 9 on the shaft sleeve protector 1. Manhole covers are installed in all of the above manholes, and when the manhole covers are opened, it is convenient for constructors and tooling to enter and exit the manholes.

[0038] The second step: Design a rail trolley. This rail trolley can be guided by the T-shaped profile inside the shaft sleeve protector 1, facilitating the transportation of the hydraulic coupling 2 inside the shaft sleeve protector 1. The rail trolley has a stopping function, and the movement of the tailshaft tube bearing 4 inside the shaft sleeve protector 1 also needs to be transported through the rail trolley. The rail trolley consists of two moving wheel frames 3.

[0039] In the second step, a through groove adapted to the T-shaped profile inside the shaft sleeve protector 1 is opened at the bottom of the moving wheel frame 3. Two rollers 31 are provided at the bottom of the moving wheel frame 3, and the rollers 31 are in contact with the inner wall of the shaft sleeve protector 1.

[0040] The top of the moving wheel frame 3 is an arc surface that fits the hydraulic coupling 2, and a rubber pad 32 is bonded inside the arc surface. A retaining piece 33 is fixedly connected to the end of the moving wheel frame 3, and a mounting hole is opened on the retaining piece 33. A bolt is provided in the mounting hole, and the retaining piece 33 can be fixed to the end of the hydraulic coupling 2 through the bolt.

[0041] In the second step, a hole plate is fixedly connected to the moving wheel frame 3. A locking bolt 34 is threadedly connected to the hole plate, and a threaded hole adapted to the locking bolt 34 is opened at the top of the T-shaped profile. When it is necessary to fix the hydraulic coupling 2 inside the shaft sleeve protector 1, the hydraulic coupling 2 can be limited and fixed through the locking bolt 34.

[0042] Because the axis line of the shafting system must be determined after welding, the tailshaft tube bearing 4 must also be pre-embedded in the shaft sleeve protector 1, and the tailshaft tube bearing 4 can only be installed after the shaft sleeve protector 1 is welded. Similarly, the movement and fixation of the tailshaft tube bearing 4 inside the shaft sleeve protector 1 also require a similar rail trolley as described above.

[0043] Regarding the pre-placement position of the hydraulic coupling 2 inside the shaft sleeve protector 1, the positional relationship of two operating processes needs to be considered. The length 1420 of the tailshaft tube bearing 4 is pre-placed in front of the hydraulic coupling 2, and a passage for personnel to enter the shaft sleeve protector 1 from the manhole must be reserved in the front and back. At this time, as long as the front end of the hydraulic coupling 2 is placed at the middle position of the fourth manhole 8, it is okay.

[0044] Step 3: When hoisting the hydraulic coupling 2 into the shaft sleeve 1, first install the two mobile wheel frames 3 at both ends of the hydraulic coupling 2 respectively, so that the two mobile wheel frames 3 and the hydraulic coupling 2 are fixed together to form a movable trolley. The hoist 10 is suspended on the hydraulic coupling 2, and then the hoist 10 is suspended on the crane. After leveling, the hydraulic coupling 2 is moved to a position slightly behind the No. 4 manhole 8 in the shaft sleeve 1 (i.e., the predetermined position, leaving a placement space and working space for the tail pipe bearing in the front), and the hydraulic coupling 2 is fixed by using the stopping function of the rail trolley;

[0045] In Step 3, a first lifting point 21 and a third lifting point 23 are respectively arranged at both ends of the hydraulic coupling 2, and a second lifting point 22 is arranged at the outer circle of the middle part of the hydraulic coupling 2.

[0046] In Step 3, when the hydraulic coupling 2 is hoisted into the shaft sleeve 1, two lifting points are used. That is, the third lifting point 23 at the end of the hydraulic coupling is selected in the front, and the second lifting point 22 on the outer circle of the hydraulic coupling 2 is used in the back. The hoist 10 is hung on the crane. After leveling, the rear section of the hydraulic coupling 2, that is, the end provided with the first lifting point 21, is moved into the shaft sleeve 1. The crane gently lowers, and the hoist 10 also cooperates to lower, so that one end of the roller 31 on the rail trolley presses against the inner wall of the shaft sleeve 1. Continue to loosen the hoist 10, and the crane continues to move the hydraulic coupling 2 into the sleeve until the roller 31 at the other end of the rail trolley presses against the inner wall of the shaft sleeve 1; Inside the shaft sleeve 1, the prepared hoist 10 is used to pull inward, and at the same time, inertial protection is done well; The hoist 10 for lifting is removed, and the hydraulic coupling 2 is slid to the predetermined position and fixed.

[0047] Before hoisting the shaft sleeve 1 onto the ship, install the hydraulic coupling 2 and the tail pipe bearing 4 on the mobile wheel frame 3, assemble them into a rail trolley, hoist and move it in place and fix it in the inner field. To prevent pollution or damage to it during subsequent processes for a period of time, it is hermetically protected. An iron sheet door that can be opened and closed and is easy to disassemble and assemble is actually made on site. There is also a small square door in the middle of the door for the shafting installation and alignment light use.

[0048] Step 4: Subsequently, hoist the shaft sleeve 1 by an external crane and weld it to the hull, then install the tail pipe bearing 4. After the installation of the tail pipe bearing 4, install the tail pipe shaft 11. And before the tail pipe shaft 11 is installed in place, the rail trolley on the hydraulic coupling 2 needs to be removed. When removing the rail trolley, at this time, hoist the hydraulic coupling 2 by the lifting beam and move the hydraulic coupling 2 to a position close to the end position (between the No. 3 and No. 4 manholes) to facilitate the removal of the removed rail trolley from the manhole;

[0049] In the fourth step, after the tail pipe shaft 11 is shifted and installed at the third manhole 7, a hoist 10 is suspended on the second lifting point 22 of the hydraulic coupling 2. The locking bolt 34 is unscrewed to release the fixation of the hydraulic coupling 2. Subsequently, the hydraulic coupling 2 is lifted by the hoist 10 and moved close to the position between the third and fourth manholes, facilitating the construction personnel to enter the manhole to remove the rail trolley and move the rail trolley out of the manhole.

[0050] Fifth step: When installing the tail pipe shaft 11, first insert the tail pipe shaft 11 into the shaft sleeve 1, and measure the horizontal angle of the shaft. Adjust the horizontal angle of the pulley track of the lifting beam to be the same as the shaft.

[0051] In the fifth step, before inserting the tail pipe shaft 11, a copper sleeve is detachably installed at the end of the tail pipe shaft 11, and the copper sleeve has a guiding taper. The length of the hydraulic coupling 2 is 1700 mm. When the end of the tail pipe shaft 11 is about 600 mm away from the hydraulic coupling 2, stop inserting the shaft. Make a mark at the position 900 mm away from the end of the tail pipe shaft 11.

[0052] Subsequently, measure the horizontal angle of the tail pipe shaft 11. The angle can be measured with a horizontal angle gauge. Adjust the horizontal angle of the lifting beam to be the same as the shaft, then move the hydraulic coupling 2 to make its port close to the shaft end. Adjust the height and horizontal angle of the hydraulic coupling 2 to adapt to the shaft. Arrange one person inside the shaft sleeve 1 to observe the surrounding clearance and adjust it evenly. Slowly move the hydraulic coupling 2 onto the tail pipe shaft 11. During the process, the hoist 10 can be manually pushed to sway left and right, and the lifting height can be finely adjusted as needed. In this way, gradually complete the installation of the hydraulic coupling 2 onto the tail pipe shaft 11.

[0053] When installing the tail pipe shaft 11, a lifting tooling is needed. First, install the lifting tooling on the tail pipe shaft 11, then the hoist 10 extends into the first manhole to suspend the lifting point of the lifting tooling. The lifting point of the lifting tooling is the same as the lifting point set on the hydraulic coupling 2, and the used lifting tooling must be able to be disassembled and lifted in sections. The longest section of the lifting tooling is 1200 mm long, the length of the manhole is 800 mm, and the distances between the first manhole 5, the second manhole 6, the third manhole 7, and the fourth manhole 8 are relatively short, enabling the tail pipe shaft 11 to be gradually moved to the third manhole 7, and then the hydraulic coupling 2 can be sleeved by moving it.

[0054] Sixth step: Continue to move the hydraulic coupling 2 through the lifting beam, and use the same angle between the lifting beam and the shaft to coaxially translate the hydraulic coupling 2 close to the third manhole 7, making its port close to the shaft end of the tail pipe shaft 11. If there is jamming, use a feeler gauge to check the clearance direction, and finely adjust the force of the hoist 10 to sleeve the hydraulic coupling 2 on the tail pipe shaft 11.

[0055] Subsequently, the paddle shaft 12 is inserted into the shaft sleeve 1, and the paddle shaft 12 is moved so that the two shaft ends are close to each other. At the No. 4 manhole 8 and the No. 5 manhole 9, the hoist 10 can be used to adjust the height and horizontal angle of the paddle shaft 12. At the No. 1 manhole 5, the hoist 10 can also be used to adjust the tail pipe shaft 11 to align the two shaft ends. The deviation of offset and bend is controlled within 0.02 mm. For the alignment here, two adjustable supports are specially designed and embedded below the No. 4 manhole 8. The adjustable support includes a jacking seat 15 embedded in the shaft sleeve 1, and a jacking bolt 16 is threadedly connected inside the jacking seat 15, which can play its role of adjusting and stabilizing. When the alignment reaches a satisfactory effect, it is reported for inspection on site.

[0056] It should be noted that in the sixth step, the copper sleeve at the end of the tail pipe shaft 11 is removed, and the shaft end of the tail pipe shaft 11 is cleaned. After the paddle shaft 12 is inserted, it is inspected and cleaned. A mark is made on the paddle shaft 12 at a distance of 800 mm from its shaft end. Subsequently, the paddle shaft 12 is moved so that the two shaft ends are close to each other.

[0057] Step 7: After the two shafts are aligned, clean and report to the shipowner and the ship inspection; slide the hydraulic coupling 2 backward so that half of the hydraulic coupling 2 is wrapped around the paddle shaft 12 and half is wrapped around the tail pipe shaft 11. After confirming the correct position, use a high-pressure oil pump to pressurize the hydraulic coupling 2 radially and axially and make records, and connect the two shafts into one body; since the clearance between the hydraulic coupling 2 and the manhole is small, the joint connecting the hydraulic oil pipe and the oil hole of the coupling is designed in a right-angle form.

[0058] Those of ordinary skill in the art should understand that the discussion of any embodiment above is only exemplary and is not intended to imply that the scope of the present invention is limited to these examples; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as above, which are not provided in detail for the sake of brevity.

[0059] The embodiments of the present invention are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for installing a hydraulic coupling within a shaft sleeve, characterized in that, The steps include the following: The first step: Open manholes. Open a first manhole (5), a second manhole (6), a third manhole (7), a fourth manhole (8), and a fifth manhole (9) on the shaft sleeve (1). Manhole covers are installed in all the above-mentioned manholes. When the manhole covers are opened, it is convenient for constructors and tooling to enter and exit the manholes; The second step: Design a rail trolley. The rail trolley can be guided by the T-shaped profile inside the shaft sleeve (1) to facilitate the transportation of the hydraulic coupling (2) inside the shaft sleeve (1). The rail trolley has a stopping function. The movement of the tail pipe bearing (4) inside the shaft sleeve (1) also needs to be transported through the rail trolley. The rail trolley is composed of two moving wheel frames (3); The third step: When hoisting the hydraulic coupling (2) into the shaft sleeve (1), first install the two moving wheel frames (3) at both ends of the hydraulic coupling (2) respectively, so that the two moving wheel frames (3) are fixed to the hydraulic coupling (2) as a whole to form a movable trolley. The hoist (10) is suspended on the hydraulic coupling (2). Subsequently, the hoist (10) is suspended on the crane. After leveling, the hydraulic coupling (2) is moved to a position slightly behind the fourth manhole (8) inside the shaft sleeve (1), that is, the predetermined position, and the hydraulic coupling (2) is fixed by using the stopping function of the rail trolley; The fourth step: Subsequently, the shaft sleeve (1) is hoisted by an external crane and welded to the hull. Then, install the tail pipe bearing (4). After the tail pipe bearing (4) is installed, install the tail pipe shaft (11). Before the tail pipe shaft (11) is installed in place, the rail trolley on the hydraulic coupling (2) needs to be removed. When removing the rail trolley, at this time, the hydraulic coupling (2) is hoisted by the lifting beam and the hydraulic coupling (2) is moved between the third and fourth manholes to facilitate the removal of the removed rail trolley from the manhole; The fifth step: When installing the tail pipe shaft (11), first insert the tail pipe shaft (11) into the shaft sleeve (1), and measure the horizontal angle of the shaft. Adjust the horizontal angle of the pulley track of the lifting beam to be the same as the shaft; In the fifth step, before inserting the tail pipe shaft (11), a copper sleeve is detachably installed at the end of the tail pipe shaft (11), and the copper sleeve has a guiding taper. The length of the hydraulic coupling (2) is 1700 mm. When the end of the tail pipe shaft (11) is still 600 mm away from the hydraulic coupling (2), stop inserting the shaft. Make a mark at a position 900 mm from the end of the tail pipe shaft (11); Subsequently, measure the horizontal angle of the tail pipe shaft (11). The angle is measured by a horizontal angle gauge. Adjust the horizontal angle of the lifting beam to be the same as the shaft, and then move the hydraulic coupling (2) so that its port is close to the shaft end. Adjust the height and horizontal angle of the hydraulic coupling (2) to adapt to the shaft. Arrange a person inside the shaft sleeve (1) to observe the surrounding clearance and adjust it evenly. Slowly move the hydraulic coupling (2) and sleeve it onto the tail pipe shaft (11); During the process, manually push the hoist (10) to sway left and right, and fine-tune the lifting height as needed. In this way, gradually complete the sleeving of the hydraulic coupling (2) onto the tail pipe shaft (11); Step 6: Continue to move the hydraulic coupling (2) through the lifting beam, and translate the hydraulic coupling (2) coaxially to near the No. 3 manhole (7) at the same angle as the axis of the lifting beam, so that its port is close to the shaft end of the tail pipe shaft (11). If there is jamming, use a feeler gauge to check the clearance orientation, and finely adjust the force of the hoist (10) to sleeved the hydraulic coupling (2) on the tail pipe shaft (11). Subsequently, insert the propeller shaft (12) into the shaft sleeve (1), and move the propeller shaft (12) until the two shaft ends are close. Use the hoist (10) to adjust the height and horizontal angle of the propeller shaft (12) at the No. 4 manhole (8) and the No. 5 manhole (9), and use the hoist (10) to adjust the tail pipe shaft (11) at the No. 1 manhole (5) to align the two shaft ends, so that the deviation of offset and twist is controlled within 0.02 mm. Design and pre-embed two adjusting supports below the No. 4 manhole (8). The adjusting support includes a jacking seat (15) pre-embedded in the shaft sleeve (1), and a jacking bolt (16) is threadedly connected in the jacking seat (15). Step 7: After the two shafts are aligned, clean and report to the shipowner and ship inspection. Slide the hydraulic coupling (2) backward so that half of the hydraulic coupling (2) is wrapped around the propeller shaft (12) and half is wrapped around the tail pipe shaft (11). After confirming the correct position, use a high-pressure oil pump to pressurize the hydraulic coupling (2) radially and axially and make records to connect the two shafts into one body. Since the clearance between the hydraulic coupling (2) and the manhole is small, the joint connecting the hydraulic oil pipe and the oil hole of the coupling is designed in a right-angle form.

2. The installation method of a hydraulic coupling in a shaft protecting sleeve according to claim 1, characterized in that In the second step, a through groove adapted to the T-shaped profile in the shaft sleeve (1) is opened at the bottom of the moving wheel frame (3), and two rollers (31) are arranged at the bottom of the moving wheel frame (3), and the rollers (31) are in contact with the inner wall of the shaft sleeve (1). The top of the moving wheel frame (3) is an arc surface that fits the hydraulic coupling (2), and a rubber pad (32) is bonded inside the arc surface. A retaining piece (33) is fixedly connected to the end of the moving wheel frame (3), and a mounting hole is opened in the retaining piece (33), and a bolt is arranged in the mounting hole. The retaining piece (33) can be fixed to the end of the hydraulic coupling (2) through the bolt.

3. A method for installing a hydraulic coupling in a shaft protection sleeve according to claim 2, characterized in that, In the second step, an orifice plate is fixedly connected to the moving wheel frame (3), and a locking bolt (34) is threadedly connected to the orifice plate. A threaded hole adapted to the locking bolt (34) is opened at the top of the T-shaped profile. When it is necessary to fix the hydraulic coupling (2) in the shaft sleeve (1), the hydraulic coupling (2) can be limited and fixed through the locking bolt (34).

4. A method for installing a hydraulic coupling in a shaft protection sleeve according to claim 3, characterized in that, In the third step, a first lifting point (21) and a third lifting point (23) are respectively arranged at both ends of the hydraulic coupling (2), and a second lifting point (22) is arranged at the outer circumference of the middle part of the hydraulic coupling (2).

5. A method for installing a hydraulic coupling in a shaft sleeve according to claim 4, characterized in that, In the third step, when the hydraulic coupling (2) is lifted into the shaft sleeve (1), two lifting points are used. That is, at the front, the third lifting point (23) at the end of the hydraulic coupling is selected, and at the back, the second lifting point (22) on the outer circle of the hydraulic coupling (2) is used. Hang the hoist (10) on the crane. After leveling, move the rear section of the hydraulic coupling (2), that is, the end with the first lifting point (21), into the shaft sleeve (1). The crane gently lowers, and the hoist (10) also cooperates to lower, so that one of the rollers (31) at one end of the rail trolley presses against the inner wall of the shaft sleeve (1). Continue to loosen the hoist (10), and the crane continues to move the hydraulic coupling (2) into the sleeve until the roller (31) at the other end of the rail trolley presses against the inner wall of the shaft sleeve (1); use the prepared hoist (10) inside the shaft sleeve (1) to pull inward, and at the same time do a good job in inertia protection; release the lifted hoist (10), slide the hydraulic coupling (2) to the predetermined position, and fix it.

6. A method for installing a hydraulic coupling within a shaft sleeve according to claim 5, characterized in that, In the fourth step, when the tail pipe shaft (11) is shifted and installed at the No. 3 manhole (7), hang the hoist (10) on the second lifting point (22) on the hydraulic coupling (2). Unscrew the locking bolt (34) to release the fixation of the hydraulic coupling (2). Then lift the hydraulic coupling (2) through the hoist (10), and move the hydraulic coupling (2) between the No. 3 and No. 4 manholes, so that construction workers can enter the manhole to remove the rail trolley and move the rail trolley out of the manhole.

7. A method for installing a hydraulic coupling in a shaft protection sleeve according to claim 1, characterized in that, In the sixth step, remove the copper sleeve at the end of the tail pipe shaft (11), and clean the shaft end of the tail pipe shaft (11). After the propeller shaft (12) is inserted, check and clean it. Make a mark on the propeller shaft (12) at a distance of 800 mm from its shaft end. Then move the propeller shaft (12) so that the two shaft ends are close to each other.

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