Method for installing hydraulic coupling in protective shaft sleeve

Abstract

The invention relates to the technical field of installation of large couplings, in particular to a method for installing a hydraulic coupling in a protective shaft sleeve, which comprises the following steps of: forming a No.1 manhole, a No.2 manhole, a No.3 manhole, a No.4 manhole and a No.5 manhole in the protective shaft sleeve, designing a rail trolley, and transporting the hydraulic coupling in the protective shaft sleeve by the rail trolley by taking a T-shaped section bar in the protective shaft sleeve as a guide; the hoist is hung on the rigging, and after leveling, the hydraulic coupling is transferred to the fourth manhole in the protective shaft sleeve. The rail trolley, the manhole, the rigging, the lifting beam and the hoist lifting appliance are used, the protective shaft sleeve can be pre-placed at a proper position and fixed before being lifted, and when a tail pipe shaft and a paddle shaft are connected through a hydraulic coupling subsequently, the lifting beam can further adjust the height and the horizontal angle of a hydraulic connecting shaft, the paddle shaft and the tail pipe shaft, so that the tail pipe shaft and the paddle shaft are connected conveniently. Centering can be conveniently carried out when the propeller shaft and the tail pipe shaft are connected, the installation precision is improved, and convenience is provided for installation.

Description

Technical Field

[0001] The present invention relates to the technical field of installation of large hydraulic couplings, and particularly to a method for installing a hydraulic coupling within a shaft 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 sleeve (connected by a hydraulic coupling) to form a closed structure. This means that the tail shaft (ø675*L14000) and the stern tube shaft (ø645*L14000) must be connected within the shaft sleeve, and the axis of this shafting makes an angle of 2.0272° with the baseline, which greatly increases the difficulty of construction.

[0003] Also, considering the influence of the welded connection of the shaft sleeve on the shafting, the installation of the tail bearing and the stern tube bearing is arranged after the installation of the shaft sleeve. From the perspective of the physical dimensions, the hydraulic coupling and the stern tube bearing must be pre-placed in appropriate positions within the shaft sleeve before the installation of the shaft sleeve. However, when the hydraulic coupling connecting the propeller shaft and the tail shaft is pre-hoisted and fixed within the shaft sleeve in advance, since the hydraulic coupling is a large workpiece with a large volume and heavy mass, it is difficult to hoist the huge hydraulic coupling into the shaft 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

[0004] In view of this, the purpose of the present invention is to provide a method for installing a hydraulic coupling within a shaft sleeve to solve the problem that before the hoisting of the shaft sleeve, the hydraulic coupling must be pre-hoisted and fixed within the shaft sleeve in advance. Since the hydraulic coupling is a large workpiece with a large volume and heavy mass, and the operation is carried out within the shaft sleeve, it is inconvenient for hoisting, shifting, and centering.

[0005] Based on the above purpose, the present invention provides a method for installing a hydraulic coupling within a shaft sleeve, including the following steps: The first step: opening manholes. Open a first manhole, a second manhole, a third manhole, a fourth manhole, and a fifth manhole on the shaft 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, facilitating construction; The second step: designing a rail trolley. This rail trolley can be guided by the T-shaped profile inside the shaft sleeve, facilitating the transportation of the hydraulic coupling within the shaft sleeve. And the rail trolley has a stopping function. The movement of the stern tube bearing within the shaft sleeve also needs to be transported by the rail trolley. The rail trolley is composed of two moving wheel frames; Step 3: When hoisting the hydraulic coupling into the shaft guard sleeve, first install the 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 as a whole to form a movable trolley. Then, hang a hoist on the rigging, hang the hoist on the hydraulic coupling, and then hang the rigging on the crane. After leveling, move the hydraulic coupling to a position slightly behind the No. 4 manhole in the shaft guard sleeve (i.e., the predetermined position, leaving space for placing and working on the stern tube bearing in front), and fix the hydraulic coupling by using the stopping function of the rail trolley; Step 4: Then, lift and weld the shaft guard sleeve to the hull by an external crane, and then install the stern tube bearing. After installing the stern tube bearing, install the stern tube shaft. Before the stern tube 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; Step 5: When installing the stern tube shaft, first insert the stern tube 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; Step 6: Continue to move the hydraulic coupling by 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 stern tube 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 stern tube shaft; Then insert the propeller shaft into the shaft guard sleeve, and move the propeller shaft to make the two shaft ends 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 sling. At the No. 1 manhole, the stern tube shaft can also be adjusted by using the hoist sling to align the two shaft ends, so that the deviation of offset and twist is controlled within 0.02 mm. For the 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 of adjusting and stabilizing; Step 7: After the two shafts are aligned, clean and report to the shipowner and ship inspection; slide the coupling backward so that half of the hydraulic coupling is wrapped on the propeller shaft and half is wrapped on the stern tube 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; due to the small distance between the hydraulic coupling and the manhole door, the joint connecting the hydraulic oil pipe and the oil hole of the coupling is designed in a right-angle form.

[0006] Preferably, in Step 2, a through groove adapted to the T-shaped section in the shaft guard sleeve is opened at the bottom of the movable wheel frame, and two rollers are provided at the bottom of the movable wheel frame, and the rollers are in contact with the inner wall of the shaft guard sleeve; 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 an installation hole is provided on the retaining piece. A bolt is arranged in the installation hole, and the retaining piece can be fixed to the end of the hydraulic coupling through the bolt.

[0007] Preferably, in the second step, a perforated plate is fixedly connected to the moving wheel frame. A locking bolt is threadedly connected to the perforated plate, and a threaded hole adapted to the locking bolt is provided at the top of the T-shaped profile. When it is necessary to fix the hydraulic coupling in the shaft protection sleeve, the hydraulic coupling can be limited and fixed through the locking bolt.

[0008] Preferably, in the third step, a first lifting point and a third lifting point are respectively arranged at both ends of the hydraulic coupling, and a second lifting point is arranged at the outer circumference of the middle part of the hydraulic coupling.

[0009] Preferably, in the third step, when the hydraulic coupling is hoisted 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. A 3T hoist is hung on the rigging (to facilitate adjusting the length and angle). The rigging is hung on the crane. After leveling, the rear section (i.e., the end provided with the first lifting point) of the hydraulic coupling is moved into the shaft protection sleeve. The crane gently lowers, and the hoist also cooperates to lower, so that the rear wheels of the coupling trolley press against the inner wall of the shaft protection sleeve. Continue to loosen the hoist, and the crane continues to move the coupling into the sleeve until the front wheels also press against the inner wall of the shaft protection sleeve; inside the shaft protection sleeve, the prepared rigging and hoist are used to pull inward, and at the same time, inertial protection is done well; the hoisting rigging and hoist are removed, and the coupling is slid to the predetermined position and fixed.

[0010] Preferably, in the fourth step, when the tail pipe shaft is shifted and installed at the No. 3 manhole, a hoist sling is hung on the second lifting point of the hydraulic coupling. The locking bolt is unscrewed to release the fixation of the hydraulic coupling. Subsequently, the hydraulic coupling is hoisted by the hoist sling, and the hydraulic coupling is moved between the No. 3 and No. 4 manholes, which is convenient for construction personnel to enter the manhole to remove the track trolley and move the track trolley out of the manhole.

[0011] 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 distance between the end of the tail pipe shaft and the hydraulic coupling is about 600 mm, stop inserting the shaft. Make a mark at the position 900 mm away from the end of the tail pipe shaft on the tail pipe shaft; 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 clearance around 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. Thus, gradually complete the installation of the hydraulic coupling onto the tail pipe shaft.

[0012] 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 at 800 mm from the shaft end on the propeller shaft, and then move the propeller shaft so that the two shaft ends are close to each other.

[0013] 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 at an appropriate position before hoisting the shaft sleeve by using a rail trolley, manhole, rigging, 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 lifted 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 connecting shaft, the propeller shaft, and the tail pipe shaft, which is convenient for centering when connecting 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 hanging propeller shaft during the centering process, improving the installation accuracy, and providing convenience for the installation. Description of the Drawings

[0014] 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 use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] 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; Figure 2 It is a cross-sectional view taken along line A - A in the embodiment of the present invention; Figure 3 It is a schematic structural diagram of the shaft sleeve in the embodiment of the present invention; 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; Figure 5Schematic diagram of the structure for moving the end of the third lifting point on the hydraulic coupling in the embodiment of the present invention into the shaft protection sleeve; Figure 6 Schematic diagram of the structure after the propeller shaft and the tail pipe shaft are connected through the shaft protection sleeve in the embodiment of the present invention; Figure 7 Cross-sectional view taken along line B - B in the embodiment of the present invention.

[0016] In the figure: 1. Shaft protection 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; 11. Tail pipe shaft; 12. Propeller shaft; 15. Jacking seat; 16. Jacking bolt. Detailed implementation manners

[0017] 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 in conjunction with specific embodiments and with reference to the accompanying drawings.

[0018] 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 of ordinary skill in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not indicate any order, 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 "linked" 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.

[0019] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , a method for installing a hydraulic coupling in a shaft protection sleeve. First, considering the influence of the welded connection of the installation of the shaft protection sleeve 1 on the shafting, the installation of the tail bearing and the tail pipe bearing is arranged after the installation of the shaft protection sleeve 1. From the perspective of the physical dimensions, the hydraulic coupling 2 and the tail pipe bearing 4 must be pre-placed in the appropriate positions inside the shaft protection sleeve 1 before the installation of the shaft protection sleeve 1. The specific steps are as follows: Step 1: Open manholes. Open No. 1 manhole 5, No. 2 manhole 6, No. 3 manhole 7, No. 4 manhole 8 and No. 5 manhole 9 on the shaft sleeve 1. 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. Step 2: Design a rail trolley. The rail trolley can be guided by the T-shaped profile inside the shaft sleeve 1, which is convenient for transporting 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 by the rail trolley. The rail trolley consists of two moving wheel frames 3. In Step 2, a through groove adapted to the T-shaped profile inside the shaft sleeve 1 is opened at the bottom of the moving wheel frame 3. 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. 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. An installation hole is opened on the retaining piece 33, and a bolt is arranged in the installation hole. The retaining piece 33 can be fixed to the end of the hydraulic coupling 2 through the bolt.

[0020] In Step 2, a hole plate is fixedly connected to the moving wheel frame 3. A locking bolt 34 is threadedly connected to the hole 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 inside the shaft sleeve 1, the hydraulic coupling 2 can be limited and fixed through the locking bolt 34.

[0021] Since the axis line of the shafting must be determined after welding and installation, the tail pipe bearing 4 must also be pre-embedded in the shaft sleeve 1. The tail pipe bearing 4 can be installed only after the shaft sleeve 1 is welded and installed. Similarly, the movement and fixation of the tail pipe bearing 4 in the shaft sleeve 1 also require a similar rail trolley as above.

[0022] For the pre-placement position of the hydraulic coupling 2 in the shaft sleeve 1, the positional relationship of two operation processes needs to be considered. The length 1420 of the tail pipe bearing 4 is pre-placed in front of the hydraulic coupling 2. A passage for personnel to enter the shaft sleeve 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 No. 4 manhole 8.

[0023] Step 3: When hoisting the hydraulic coupling 2 into the shaft sleeve 1, first install 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 to form a movable trolley. Then, hang a hoist on the rigging, and the hoist is hung on the hydraulic coupling 2. Subsequently, hang the rigging on the crane. After leveling, move the hydraulic coupling 2 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 fix the hydraulic coupling 2 by using the stopping function of the rail trolley; 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 circumference of the middle part of the hydraulic coupling 2.

[0024] In Step 3, when hoisting the hydraulic coupling 2 into the shaft sleeve 1, use two lifting points, that is, select the third lifting point 23 at the end of the hydraulic coupling at the front, and use the second lifting point 22 on the outer circumference of the hydraulic coupling 2 at the back. Hang a 3T hoist on the rigging to facilitate adjusting the length and angle. Hang the rigging on the crane. After leveling, move the rear section of the hydraulic coupling 2, that is, the end provided with the first lifting point 21, into the shaft sleeve 1. The crane gently lowers, and the hoist also cooperates to lower, so that the rear wheels of the coupling trolley press against the inner wall of the shaft sleeve 1. Continue to loosen the hoist, and the crane continues to move the hydraulic coupling 2 further into the sleeve until the front wheels also press against the inner wall of the shaft sleeve 1; Inside the shaft sleeve 1, use the prepared rigging and hoist to pull inward, and at the same time do a good job in inertia protection; Remove the hoist of the lifting rigging, slide the hydraulic coupling 2 to the predetermined position, and fix it.

[0025] Before hoisting the shaft sleeve 1 onto the ship, install the hydraulic coupling 2 and the tail pipe bearing 4 on the moving wheel frames 3, assemble them into a rail trolley, hoist and move it in place and fix it in the inner yard. To prevent pollution or damage to it during subsequent processes for a period of time, carry out closed protection for it. Make a switchable and easily disassembled iron sheet door at the actual site. There is also a small square door in the middle of the door for shafting installation and alignment.

[0026] Step 4: Subsequently, hoist the shaft sleeve 1 by an external crane and weld it to the hull, and then install the tail pipe bearing 4. After installing the tail pipe bearing 4, install the tail pipe shaft 11. And before the tail pipe shaft 11 is installed in place, it is necessary to remove the rail trolley on the hydraulic coupling 2. 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 third and fourth manholes) to facilitate removing the removed rail trolley from the manhole; In the fourth step, when the tail pipe shaft 11 is shifted and installed at the third manhole 7, a hoist sling is hung 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 sling and moved close to the position between the third and fourth manholes, facilitating the construction personnel to enter the manhole to remove the track trolley and move the track trolley out of the manhole.

[0027] 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 trolley track of the lifting beam to be the same as that of 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 about 600 mm away from the hydraulic coupling 2, stop inserting the shaft, and make a mark at the position 900 mm away from its end on the tail pipe shaft 11. Subsequently, measure the horizontal angle of the tail pipe shaft 11, which can be measured with a horizontal angle gauge. Adjust the horizontal angle of the lifting beam to be the same as that of the shaft, 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 one person inside the shaft sleeve 1 to observe the surrounding fitting gaps and adjust them evenly. Slowly move the hydraulic coupling 2 onto the tail pipe shaft 11. During the process, the hoist sling 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.

[0028] 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 sling extends into the first manhole to hang 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 moved for sleeving.

[0029] Sixth step: Continuously 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 gap orientation and finely adjust the force on the hoist to sleeve the hydraulic coupling 2 onto the tail pipe shaft 11. 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 height and horizontal angle of the paddle shaft 12 can be adjusted by using the hoist 10. At the No. 1 manhole 5, the tail pipe shaft 11 can also be adjusted by using the hoist 10 to align the two shaft ends, so that the deviation of offset and twist 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.

[0030] 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, and then the paddle shaft 12 is moved so that the two shaft ends are close to each other.

[0031] 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.

[0032] 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.

[0033] 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 in a shaft protection sleeve, characterized in that: The following steps are involved: The first step is to open a manhole, and open a No. 1 manhole (5), a No. 2 manhole (6), a No. 3 manhole (7), a No. 4 manhole (8) and a No. 5 manhole (9) on the shaft protection sleeve (1), and install a manhole cover in all the above manholes, and when the manhole cover is opened, it is convenient for construction workers and work tools to enter and exit the manhole; Step 2: Design a rail trolley, which can be guided by the T-shaped material inside the shaft protection sleeve (1) to facilitate the transportation of the hydraulic coupling (2) inside the shaft protection sleeve (1), and the rail trolley has a stopping function, and the movement of the tail tube bearing (4) inside the shaft protection sleeve (1) also needs to be transported by the rail trolley, and the rail trolley is composed of two moving wheel frames (3); Step 3: When the hydraulic coupling (2) is hoisted into the shaft protection sleeve (1), the two movable wheel frames (3) are first installed at both ends of the hydraulic coupling (2) respectively, so that the two movable wheel frames (3) and the hydraulic coupling (2) are fixed as a whole to form a movable trolley, and then a hoist is hung on the rigging, and the hoist is hung on the hydraulic coupling (2), and then the rigging is hung on the crane. After leveling, the hydraulic coupling (2) is moved to the rear of the No. 4 manhole (8) in the shaft protection sleeve (1), that is, the predetermined position, and the hydraulic coupling (2) is fixed by using the stop function of the rail trolley; Step 4: Subsequently, the shaft protection sleeve (1) is lifted by an external crane and welded to the hull, and then the stern tube bearing (4) is installed. After the stern tube bearing (4) is installed, the stern tube shaft (11) is installed, and before the stern tube shaft (11) is installed in place, the rail trolley on the hydraulic coupling (2) needs to be removed. When removing the rail trolley, the hydraulic coupling (2) is lifted 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; Step 5: When installing the tail tube shaft (11), first insert the tail tube shaft (11) into the shaft protection sleeve (1), measure the horizontal angle of the shaft, and adjust the horizontal angle of the pulley track of the hanging beam to be consistent with the shaft; Step 6: 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) to the position close to the No. 3 manhole (7), so that its end is close to the shaft end of the tail tube shaft (11). If there is any jamming, use a feeler gauge to check the gap position, and fine-tune the hoist force so that the hydraulic coupling 2 is sleeved on the tail tube shaft (11), and the hydraulic coupling (2) is sleeved on the tail tube shaft (11); Then, insert the propeller shaft (12) into the shaft protection sleeve (1), and move the propeller shaft (12) until the two shaft ends are close to each other. The height and horizontal angle of the propeller shaft (12) can be adjusted by using the hoist (10) in the No. 4 manhole (8) and the No. 5 manhole (9). The tail tube shaft (11) can also be adjusted by using the hoist (10) in the No. 1 manhole (5) to align the two shaft ends so that the deviation of the offset and the twist is controlled within 0.02 mm. Step 7: After the two shafts are aligned, clean them and report them to the shipowner for ship inspection; slide the hydraulic coupling (2) backward so that half of the hydraulic coupling (2) is wrapped around the propeller shaft (12) and the other half is wrapped around the stern tube shaft (11). After confirming that the position is correct, use a high-pressure oil pump to pressurize the hydraulic coupling (2) in the radial and axial directions and keep a record, and connect the two shafts into one; since the gap between the hydraulic coupling (2) and the manhole is small, the joint connecting the hydraulic oil pipe and the coupling oil hole is designed to be a right angle.

2. A method for installing a hydraulic coupling in a shaft protection sleeve according to claim 1, characterized in that: In the second step, a through groove matching the T-shaped material inside the shaft protection sleeve (1) is opened at the bottom of the movable wheel frame (3), and two rollers (31) are arranged at the bottom of the movable wheel frame (3), and the rollers (31) are in contact with the inner wall of the shaft protection sleeve (1); The top of the movable wheel frame (3) is an arc-shaped surface that fits the hydraulic coupling (2), and a rubber pad (32) is bonded inside the arc-shaped surface. A baffle (33) is fixedly connected to the end of the movable wheel frame (3), and a mounting hole is formed on the baffle (33), and a bolt is arranged in the mounting hole, so that the baffle (33) can be fixed to the end of the hydraulic coupling (2) by means of the bolt.

3. A method for installing a hydraulic coupling in a shaft protection sleeve according to claim 1, characterized in that: In the second step, a perforated plate is fixedly connected to the movable wheel frame (3), a locking bolt (34) is threadedly connected to the perforated plate, and a threaded hole matched with the locking bolt (34) is opened on the top of the T-shaped material. When it is necessary to fix the hydraulic coupling (2) in the shaft protection sleeve (1), the locking bolt (34) can be used to limit and fix the hydraulic coupling (2).

4. A method for installing a hydraulic coupling in a shaft protection sleeve according to claim 1, characterized in that: In the third step, a first hanging point (21) and a third hanging point (23) are respectively arranged at both ends of the hydraulic coupling (2), and a second hanging point (22) is arranged at the middle outer circle of the hydraulic coupling (2).

5. A method for installing a hydraulic coupling in a shaft protection sleeve according to claim 4, characterized in that: In the third step, when the hydraulic coupling (2) is hoisted into the shaft protection 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. A 3T hoist is hung on the rigging to facilitate the adjustment of the length and angle. The rigging is hung on the crane. After leveling, the rear section of the hydraulic coupling (2), that is, the end with the first lifting point (21) is moved into the shaft protection sleeve (1). ), the crane is gently lowered, and the hoist is also lowered so that the rear wheel of the coupling trolley presses against the inner wall of the shaft protection sleeve (1). The hoist is further relaxed, and the crane continues to move the hydraulic coupling (2) into the sleeve until the front wheel also presses against the inner wall of the shaft protection sleeve (1); the shaft protection sleeve (1) is pulled inwardly with the prepared rigging and hoist, and inertia protection is provided at the same time; the hoisted rigging is released, and the hydraulic coupling (2) is slid to the predetermined position and fixed.

6. A method for installing a hydraulic coupling in a shaft protection sleeve according to claim 5, characterized in that: In the fourth step, the tail tube shaft (11) is moved and installed at the third manhole (7), a hoist is hung on the second lifting point (22) on the hydraulic coupling (2), the locking bolt (34) is unscrewed to release the fixation of the hydraulic coupling (2), and then the hydraulic coupling (2) is lifted by the hoist, and the hydraulic coupling (2) is moved between the third and fourth manholes to facilitate construction personnel to 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 5, characterized in that: In the fifth step, before plugging the tail tube shaft (11), a copper sleeve is detachably installed at the end of the tail tube shaft (11), and the copper sleeve has a guide taper. The length of the hydraulic coupling (2) is 1700 mm. When the end of the tail tube shaft (11) is about 600 mm away from the hydraulic coupling (2), the plugging of the shaft is stopped, and a mark is made on the tail tube shaft (11) at a position 900 mm away from the end thereof; Then measure the horizontal angle of the tail tube shaft (11). The angle can be measured with a horizontal angle meter. Adjust the horizontal angle of the hanging beam to be the same as the shaft. 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 in the shaft protection sleeve (1) to observe the matching clearance around and adjust it evenly. Slowly move the hydraulic coupling (2) onto the tail tube shaft (11). During the process, the hoist can be manually pushed to shake left and right to fine-tune the lifting height as needed. In this way, the hydraulic coupling (2) is gradually put on the tail tube shaft (11).

8. A method for installing a hydraulic coupling in a shaft protection sleeve according to claim 7, characterized in that: In the sixth step, the copper sleeve at the end of the tail tube shaft (11) is removed, and the shaft end of the tail tube shaft (11) is cleaned. After the propeller shaft (12) is inserted, it is checked and cleaned. A mark is made on the propeller shaft (12) at a distance of 800 mm from the shaft end, and then the propeller shaft (12) is moved until the two shaft ends are close to each other.

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