Shaft connecting method for ship controllable-pitch propeller shafting

Abstract

The invention relates to the technical field of ship shafting, and discloses a shaft connecting method for a ship controllable-pitch propeller shafting, which comprises the following steps of: mounting a first shaft connecting tool between a front end flange of a second intermediate shaft and a flange of a gear box large gear shaft, and mounting a second shaft connecting tool between a flange of a first intermediate shaft and a rear end flange of the second intermediate shaft; after a flange at the front end of the second intermediate shaft and a flange of a large gear shaft of the gearbox are folded, the first connecting shaft tools are detached one by one and replaced with flange fasteners, a second connecting shaft tool is installed between a flange of the first intermediate shaft and a flange at the rear end of the second intermediate shaft, and the lower portion of an adjusting ring is installed; the second connecting shaft tool is disassembled, and an adjusting ring is installed; the shaft section connecting preparation and dismounting workload is reduced, meanwhile, the opening value and the deviation value between the shaft sections can be effectively controlled, the quality problem that the oil pipe in the controllable-pitch propeller shaft is bent greatly can be avoided, and the whole shaft section connecting method is easy to operate and high in safety.

Description

Technical Field

[0001] The invention relates to the technical field of ship shafting, and in particular to a shaft coupling method for a ship controllable pitch propeller shafting. Background Art

[0002] The long shaft system of a ship's controllable pitch propeller is often connected by multiple shaft sections, with a total length of about 48 meters. The positioning and installation of the ship's shaft system is usually carried out in a reasonable alignment method. According to the calculation results of the shaft system alignment, the shipyard needs to connect the shaft sections after completing the alignment of each open shaft section. Since there are spacing, openings and offsets between the shaft sections (intermediate shaft No. 1, intermediate shaft No. 2, and large gear shaft of the gearbox), there are also oil pipes in the shaft that need to be connected and tested for oil pipe tightness. There are often adjustment rings between the shaft section flanges, and a low-pressure oil channel for the controllable pitch propeller is provided in the inner cavity of the shaft section. It has sealing requirements, and the connection process is complicated, which is prone to installation quality accidents. Therefore, the connection of the shaft sections of the ship's controllable pitch propeller shaft system is difficult, risky, and inefficient.

[0003] In order to achieve the connection of the shaft segments of the controllable pitch propeller shaft system, the shipyard often needs to set up temporary adjustment brackets near the ports of each shaft segment. After achieving a small alignment between the shaft segments, the shaft segments are axially moved using auxiliary tools to successfully complete the connection of the shaft segments. Due to the space limitations near the shaft segments, it is very difficult to set up temporary adjustment brackets for the shaft segments, and the adjustment brackets must be removed later. The workload of shaft segment connection preparation and follow-up is large, resulting in low efficiency in the installation of the ship's shaft system. In addition, when using auxiliary tools to axially move the shaft segments, the opening and displacement between the shaft segments are difficult to control, which can easily lead to difficulties in connecting the oil pipes in the shaft, and even cause a major quality accident in which the connected oil pipes in the shaft are bent during the movement of the shaft segments. Summary of the invention

[0004] The purpose of the present invention is to provide a method for connecting the shaft of a ship's adjustable pitch propeller, which reduces the workload of shaft segment connection preparation and dismantling, and can effectively control the opening value and offset value between the shaft segments, thereby avoiding the occurrence of large quality problems such as bending of the oil pipe in the adjustable pitch propeller shaft. The overall shaft segment connection method is simple to operate and has high safety.

[0005] In order to achieve the above-mentioned object, the present invention provides a method for connecting a shaft system of a ship's adjustable pitch propeller, wherein the adjustable pitch propeller shaft system comprises a adjustable pitch propeller, a propeller shaft, a rear hydraulic coupling, a tail shaft, a front hydraulic coupling, a distance ring, a No. 1 intermediate shaft, an adjustment ring, a No. 2 intermediate shaft and a gearbox gear shaft which are connected in sequence, and comprises the following steps: Step 1, performing an open shaft system shaft section alignment operation on the adjustable pitch propeller shaft system, and after the alignment is completed, installing and connecting the propeller shaft, the rear hydraulic coupling, the tail shaft, the front hydraulic coupling, the distance ring and the No. 1 intermediate shaft;

[0006] Step 2, installing a first shaft coupling fixture between the front end flange of the No. 2 intermediate shaft and the flange of the large gear shaft of the gear box, the first shaft coupling fixture comprising a first screw, a first locking nut, a second locking nut and a distance washer, the distance washer being clamped between the front end flange of the No. 2 intermediate shaft and the flange of the large gear shaft of the gear box, the first screw passing through the bolt hole of the front end flange of the No. 2 intermediate shaft, the inner cavity of the distance washer and the bolt hole of the flange of the large gear shaft of the gear box, the first locking nut being tightened and fixed to one end of the screw and pressed against the front end flange of the No. 2 intermediate shaft, the second locking nut being tightened and fixed to the other end of the screw and pressed against the flange of the large gear shaft of the gear box; the number of bolt holes in the front end flange of the No. 2 intermediate shaft is greater than the number of the first shaft coupling fixture installed on the front end flange of the No. 2 intermediate shaft;

[0007] A second shaft coupling fixture is installed between the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft, the second shaft coupling fixture comprising a second screw, a third locking nut, a fourth locking nut and a spacing pad column, the second screw passes through the bolt hole of the No. 1 intermediate shaft, the inner cavity of the spacing pad column and the bolt hole of the rear end flange of the No. 2 intermediate shaft, the third locking nut is tightened and fixed to one end of the second screw and pressed against the flange of the No. 1 intermediate shaft, the fourth locking nut is tightened and fixed to the other end of the second screw and pressed against the rear end flange of the No. 2 intermediate shaft, and the number of bolt holes in the flange of the No. 1 intermediate shaft is greater than the number of the second shaft coupling fixture installed on the flange of the No. 1 intermediate shaft;

[0008] Step 3, butt-connecting the oil pipe in the controllable pitch propeller shaft in the No. 1 intermediate shaft with the oil pipe in the controllable pitch propeller shaft in the No. 2 intermediate shaft, butt-connecting the oil pipe in the controllable pitch propeller shaft in the No. 2 intermediate shaft with the oil pipe in the controllable pitch propeller shaft in the large gear shaft of the gearbox, and performing a tightness test on the oil pipe in the controllable pitch propeller shaft;

[0009] Step 4: After the tightness test of the oil pipe in the controllable pitch propeller shaft is passed, the first coupling fixture is installed on the bolt hole between the front end flange of the No. 2 intermediate shaft and the flange of the gearbox large gear shaft where the first coupling fixture is not installed; the distance pad column on the first coupling fixture is removed, and all the first locking nuts and the second locking nuts are tightened to close the front end flange of the No. 2 intermediate shaft and the flange of the gearbox large gear shaft, and the first coupling fixtures are removed one by one and flange fasteners are installed between the front end flange of the No. 2 intermediate shaft and the flange of the gearbox large gear shaft at the same time. After all the first coupling fixtures are replaced with flange fasteners, the connection between the No. 2 intermediate shaft and the gearbox large gear shaft is completed;

[0010] Step 5, completely dismantle the second shaft coupling tooling located at the lower part between the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft, and install the second shaft coupling tooling at all the bolt holes located at the upper part between the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft, and adjust the length of the spacing column so that the distance between the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft is greater than the length of the adjustment ring by 2 mm to 3 mm;

[0011] Step 6, installing the lower part of the adjusting ring at the lower part between the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft, and preliminarily fastening the flange of the No. 1 intermediate shaft, the lower part of the adjusting ring and the rear end flange of the No. 2 intermediate shaft by means of flange fasteners;

[0012] Step 7, remove all the second coupling tools, install the upper part of the adjusting ring on the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft, connect the upper part of the adjusting ring with the lower part of the adjusting ring, fasten the flange of the No. 1 intermediate shaft, the upper part of the adjusting ring and the rear end flange of the No. 2 intermediate shaft with flange fasteners, and tighten and fix all flange fasteners on the flange of the No. 1 intermediate shaft, the lower part of the adjusting ring and the rear end flange of the No. 2 intermediate shaft;

[0013] Step 8: After the installation of the oil distributor of the controllable pitch propeller is completed, a low-pressure tightness test is performed on the inner hole of the controllable pitch propeller shaft system and a high-pressure tightness test is performed on the oil pipe inside the controllable pitch propeller shaft system.

[0014] As a preferred solution of the present invention, the distance adjusting column includes an externally threaded washer and an internally threaded washer, the externally threaded washer is provided with a connecting section, the outer periphery of the connecting section is provided with external threads, and the internally threaded washer is provided with an internally threaded hole threadedly connected to the connecting section.

[0015] As a preferred solution of the present invention, the first coupling tool also includes a first protective bushing and a second protective bushing, the first protective bushing is inserted into the bolt hole on the front end flange of the No. 2 intermediate shaft, and the second protective bushing is inserted into the bolt hole of the flange of the large gear shaft of the gear box; the second coupling tool also includes a third protective bushing and a fourth protective bushing, the third protective bushing is inserted into the bolt hole on the flange of the No. 1 intermediate shaft, and the fourth protective bushing is inserted into the bolt hole on the rear end flange of the No. 2 intermediate shaft.

[0016] As a preferred solution of the present invention, the first protective bushing is provided with a first limit plate which abuts against the outer end face of the front end flange of the No. 2 intermediate shaft, the second protective bushing is provided with a second limit plate which abuts against the outer end face of the flange of the large gear shaft of the gear box, the third protective bushing is provided with a third limit plate which abuts against the outer end face of the flange of the No. 1 intermediate shaft, and the fourth protective bushing is provided with a fourth limit plate which abuts against the outer end face of the rear end flange of the No. 2 intermediate shaft.

[0017] As a preferred solution of the present invention, the combined surface roughness of the distance pad column, the distance adjusting pad column, the first protective bushing, the second protective bushing, the third protective bushing and the second protective bushing and the front end flange of the No. 2 intermediate shaft, the flange of the large gear shaft of the gear box, the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft is Ra=0.8.

[0018] As a preferred solution of the present invention, the hardness of the distance pad column, the distance adjusting pad column, the first protective bushing, the second protective bushing, the third protective bushing and the second protective bushing are all lower than the hardness of the front end flange of the No. 2 intermediate shaft, the flange of the large gear shaft of the gear box, the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft.

[0019] As a preferred solution of the present invention, in step 4, before the front end flange of the No. 2 intermediate shaft and the flange of the large gear shaft of the gearbox are retracted, the inner end surface of the front end flange of the No. 2 intermediate shaft and the inner end surface of the flange of the large gear shaft of the gearbox are cleaned.

[0020] As a preferred solution of the present invention, in step 6, the inner end surface of the flange of the No. 1 intermediate shaft, the inner end surface of the rear end flange of the No. 2 intermediate shaft and the adjusting ring are cleaned.

[0021] Compared with the prior art, the coupling method of a ship controllable pitch propeller shaft system according to the embodiment of the present invention has the following beneficial effects:

[0022] The present invention connects the No. 2 intermediate shaft and the large gear shaft of the gear box through the first coupling tool, and connects the No. 1 intermediate shaft and the No. 2 intermediate shaft through the second coupling tool, and the distance between the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft can be adjusted through the distance-adjusting pad column; moreover, the shaft shifting is convenient, and there is no need to set up a temporary adjustment bracket when the shaft sections are connected, which reduces the workload of shaft section connection preparation and removal, and can effectively control the opening value and offset value between the shaft sections, so as to avoid the occurrence of large quality problems such as bending of the oil pipe in the controllable pitch propeller shaft, and the overall shaft section connection method is simple to operate and has high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0024] Figure 1 A schematic diagram of the structure of a ship controllable pitch propeller shaft system provided by the present invention;

[0025] Figure 2 A schematic diagram of the connection structure of the first shaft coupling provided by the present invention, the front end flange of the No. 2 intermediate shaft, and the flange of the large gear shaft of the gear box;

[0026] Figure 3 A schematic diagram of the connection structure between the second shaft coupling provided by the present invention and the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft;

[0027] Figure 4 A side view of the second shaft coupling provided by the present invention, the flange of the No. 1 intermediate shaft, and the rear end flange of the No. 2 intermediate shaft;

[0028] Figure 5 This is a schematic diagram of the structure of the second coupling tool provided by the present invention after the distance adjustment pad column is removed;

[0029] Figure 6 A schematic structural diagram of the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft provided by the present invention, in which the lower part of the adjusting ring is installed;

[0030] Figure 7 A side view of the lower part of the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft provided by the present invention, on which the adjusting ring is installed;

[0031] Figure 8 A schematic diagram of the structure of installing the entire adjustment ring between the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft provided by the present invention;

[0032] Fig. 9 A side view of the entire adjusting ring installed between the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft provided by the present invention;

[0033] Fig.10 A schematic structural diagram of a third protective bushing provided by the present invention;

[0034] In the figure, the first coupling tool 1, the first screw 11, the first locking nut 12, the second locking nut 13, the distance column 14, the first protective bushing 15, the second protective bushing 16, the second coupling tool 2, the second screw 21, the third locking nut 22, the fourth locking nut 23, the distance column 24, the external threaded washer 241, the connecting section 2411, the internal threaded washer 242, the third protective bushing 25, the third limit plate 251, the fourth protective bushing 26, the gear box Big gear shaft 3, flange 31 of big gear shaft of gearbox, flange fastener 32, fastening bolt 321, fastening nut 322, No. 2 intermediate shaft 4, front end flange 41 of No. 2 intermediate shaft, rear end flange 42 of No. 2 intermediate shaft, flange connection O-ring 43, adjusting ring 5, No. 1 intermediate shaft 6, flange 61 of No. 1 intermediate shaft, tail shaft 7, front hydraulic coupling 71, distance ring 72, propeller shaft 8, rear hydraulic coupling 81, adjustable pitch propeller 9, and oil pipe 10 in adjustable pitch propeller shaft. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top” and “bottom” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0037] like Figures 1 to 10 As shown, a method for connecting a ship's adjustable pitch propeller shaft system in a preferred embodiment of the present invention, wherein the adjustable pitch propeller shaft system comprises a adjustable pitch propeller 9, a propeller shaft 8, a rear hydraulic coupling 81, a tail shaft 7, a front hydraulic coupling 71, a distance ring 72, a No. 1 intermediate shaft 6, an adjustment ring 5, a No. 2 intermediate shaft 4 and a gearbox large gear shaft 3 connected in sequence, comprising the following steps:

[0038] Step 1, perform an open shafting segment alignment operation on the shafting of the controllable pitch propeller 9. After the alignment is completed, the propeller shaft 8, the rear hydraulic coupling 81, the tail shaft 7, the front hydraulic coupling 71, the distance ring 72, and the No. 1 intermediate shaft 6 are installed and connected;

[0039] Step 2, install the first shaft coupling fixture 1 between the front end flange 41 of the No. 2 intermediate shaft and the flange 31 of the large gear shaft of the gear box, the first shaft coupling fixture 1 includes a first screw rod 11, a first locking nut 12, a second locking nut 13 and a distance column 14, the distance column 14 is clamped between the front end flange 41 of the No. 2 intermediate shaft and the flange 31 of the large gear shaft of the gear box, the first screw rod 11 passes through the bolt hole of the front end flange 41 of the No. 2 intermediate shaft, the inner cavity of the distance column 14 and the bolt hole of the flange 31 of the large gear shaft of the gear box, the first locking nut 12 is tightened and fixed to one end of the screw rod and pressed against the front end flange 41 of the No. 2 intermediate shaft, the bolt holes of the front end flange 41 of the No. 2 intermediate shaft and the bolt holes of the flange 31 of the large gear shaft of the gear box are all reamed holes, the second locking nut 13 is tightened with the The other end of the screw is tightened and fixed and pressed against the flange 31 of the gearbox gear shaft. Preferably, the first locking nut 12 and the second locking nut 13 are tightened symmetrically and evenly. The number of bolt holes in the front end flange 41 of the No. 2 intermediate shaft is greater than the number of the first coupling fixture 1 installed on the front end flange 41 of the No. 2 intermediate shaft. Specifically, the first coupling fixture 1 is installed with the bolt holes on the front end flange 41 of the No. 2 intermediate shaft (the bolt holes on the flange 31 of the gearbox gear shaft) at intervals, and the front end flange 41 of the No. 2 intermediate shaft and the flange 31 of the gearbox gear shaft meet the requirements of offset value ≤ 0.05mm and tortuosity value ≤ 0.05mm / m, and the clearance between the two ends of the spacing column 14 and the inner end surface of the front end flange 41 of the No. 2 intermediate shaft and the inner end surface of the flange 31 of the gearbox gear shaft is less than 0.03mm.

[0040] A second shaft coupling fixture 2 is installed between the flange 61 of the No. 1 intermediate shaft and the rear end flange 42 of the No. 2 intermediate shaft. The second shaft coupling fixture 2 includes a second screw rod 21, a third locking nut 22, a fourth locking nut 23 and a distance-adjusting column 24. The second screw rod 21 passes through the bolt hole of the No. 1 intermediate shaft 6, the inner cavity of the distance-adjusting column 24 and the bolt hole of the rear end flange 42 of the No. 2 intermediate shaft. The third locking nut 22 is tightened and fixed to one end of the second screw rod 21 and pressed against the flange 61 of the No. 1 intermediate shaft. The bolt holes of the rear end flange 42 of the No. 2 intermediate shaft and the flange 61 of the No. 1 intermediate shaft are both reamed holes. The fourth locking nut 23 is tightened and fixed to the other end of the second screw rod 21 and pressed against the rear end flange 42 of the No. 2 intermediate shaft. The flange 42 is preferably symmetrically and evenly tightened with the third locking nut 22 and the fourth locking nut 23, the number of bolt holes in the flange 61 of the No. 1 intermediate shaft is greater than the number of the second coupling fixture 2 installed on the flange 61 of the No. 1 intermediate shaft; specifically, the second coupling fixture 2 is installed with intervals on the bolt holes on the flange 61 of the No. 1 intermediate shaft (the bolt holes on the rear end flange 42 of the No. 2 intermediate shaft), and the flange 61 of the No. 1 intermediate shaft and the rear end flange 42 of the No. 2 intermediate shaft meet the requirements of offset value ≤ 0.05mm and tortuosity value ≤ 0.05mm / m, and the clearance between the two ends of the distance adjusting column 24 and the inner end surface of the flange 61 of the No. 1 intermediate shaft and the rear end flange 42 of the No. 2 intermediate shaft is less than 0.03mm;

[0041] Step 3, butt-connecting the oil pipe 10 in the adjustable pitch propeller shaft in the No. 1 intermediate shaft 6 with the oil pipe 10 in the adjustable pitch propeller shaft in the No. 2 intermediate shaft 4, butt-connecting the oil pipe 10 in the adjustable pitch propeller shaft in the No. 2 intermediate shaft 4 with the oil pipe 10 in the adjustable pitch propeller shaft in the large gear shaft 3 of the gearbox, and performing a tightness test on the oil pipe 10 in the adjustable pitch propeller shaft;

[0042] Step 4: After the tightness test of the oil pipe 10 in the controllable pitch propeller shaft is passed, the first coupling fixture 1 is installed on the bolt hole between the front end flange 41 of the No. 2 intermediate shaft and the flange 31 of the gearbox large gear shaft where the first coupling fixture 1 is not installed; the distance pad column 14 on the first coupling fixture 1 is removed, and all the first locking nuts 12 and the second locking nuts 13 are tightened to close the front end flange 41 of the No. 2 intermediate shaft and the flange 31 of the gearbox large gear shaft, and the first coupling fixtures 1 are removed one by one and at the same time, the front end flange 41 of the No. 2 intermediate shaft is tightened. 1 and the flange 31 of the gearbox large gear shaft, and the flange fasteners 32 are replaced in sequence according to the numbers of the bolt holes on the front end flange 41 of the No. 2 intermediate shaft. When the flange fasteners 32 are installed, the fastening nuts 322 at both ends of the fastening bolts 321 are tightened symmetrically and evenly. After the first coupling tool 1 is completely replaced with the flange fasteners 32, the connection between the No. 2 intermediate shaft 4 and the gearbox large gear shaft 3 is completed, wherein the flange fasteners 32 include fastening bolts 321 and two fastening nuts 322 connected to both ends of the fastening bolts 321;

[0043] Step 5, completely dismantle the second shaft coupling fixture 2 located at the lower part between the flange 61 of the No. 1 intermediate shaft and the rear end flange 42 of the No. 2 intermediate shaft, and install the second shaft coupling fixture 2 at all the bolt holes located at the upper part between the flange 61 of the No. 1 intermediate shaft and the rear end flange 42 of the No. 2 intermediate shaft, and adjust the length of the distance adjustment column 24 so that the distance between the flange 61 of the No. 1 intermediate shaft and the rear end flange 42 of the No. 2 intermediate shaft is greater than the length of the adjustment ring 5 by 2 mm to 3 mm;

[0044] Step 6, install the lower part of the adjusting ring 5 at the lower part between the flange 61 of the No. 1 intermediate shaft and the rear end flange 42 of the No. 2 intermediate shaft, and preliminarily fasten the flange 61 of the No. 1 intermediate shaft, the lower part of the adjusting ring 5 and the rear end flange 42 of the No. 2 intermediate shaft by means of the flange fastener 32;

[0045] Step 7, remove all the second coupling tooling 2, install the upper part of the adjusting ring 5 on the flange 61 of the No. 1 intermediate shaft and the rear end flange 42 of the No. 2 intermediate shaft, and connect the upper part of the adjusting ring 5 with the lower part of the adjusting ring 5, apply a flat sealant or a sealing gasket on the interface between the upper part of the adjusting ring 5 and the lower part of the adjusting ring 5, fasten the flange 61 of the No. 1 intermediate shaft, the upper part of the adjusting ring 5 and the rear end flange 42 of the No. 2 intermediate shaft through the flange fastener 32, and tighten and fix all the flange fasteners 32 on the flange 61 of the No. 1 intermediate shaft, the lower part of the adjusting ring 5 and the rear end flange 42 of the No. 2 intermediate shaft, and symmetrically and evenly tighten the fastening nuts 322 at both ends of the fastening bolt 321, wherein the flange fastener 32 includes a fastening bolt 321 and two fastening nuts 322 connected to both ends of the fastening bolt 321;

[0046] Step 8, after completing the installation of the oil distributor of the adjustable pitch propeller 9, perform a low-pressure tightness test on the inner hole of the adjustable pitch propeller 9 shaft system and a high-pressure tightness test on the oil pipe 10 inside the adjustable pitch propeller shaft in the adjustable pitch propeller 9 shaft system. After the low-pressure tightness test and the high-pressure tightness test are passed, carry out subsequent shaft system installation work according to the shaft system installation process requirements of the ship.

[0047] Exemplarily, the distance adjusting column 24 includes an externally threaded washer 241 and an internally threaded washer 242, the externally threaded washer 241 is provided with a connecting section 2411, the outer periphery of the connecting section 2411 is provided with an external thread, and the internally threaded washer 242 is provided with an internally threaded hole threadedly connected to the connecting section 2411, so as to facilitate the adjustment of the overall length of the distance adjusting column 24 and thus the adjustment of the distance between the flange 61 of the No. 1 intermediate shaft and the rear end flange 42 of the No. 2 intermediate shaft.

[0048] Exemplarily, the first coupling tool 1 also includes a first protective bushing 15 and a second protective bushing 16, the first protective bushing 15 is inserted into the bolt hole on the front end flange 41 of the No. 2 intermediate shaft, and the second protective bushing 16 is inserted into the bolt hole of the flange 31 of the large gear shaft of the gear box; the second coupling tool 2 also includes a third protective bushing 25 and a fourth protective bushing 26, the third protective bushing 25 is inserted into the bolt hole on the flange 61 of the No. 1 intermediate shaft, and the fourth protective bushing 26 is inserted into the bolt hole on the rear end flange 42 of the No. 2 intermediate shaft, and the bolt holes on the flanges can be effectively protected by the protective bushings.

[0049] Furthermore, the first protective bushing 15 is provided with a first limit plate which abuts against the outer end face of the front end flange 41 of the No. 2 intermediate shaft, the second protective bushing 16 is provided with a second limit plate which abuts against the outer end face of the flange 31 of the large gear shaft of the gear box, the third protective bushing 25 is provided with a third limit plate 251 which abuts against the outer end face of the flange 61 of the No. 1 intermediate shaft, and the fourth protective bushing 26 is provided with a fourth limit plate which abuts against the outer end face of the rear end flange 42 of the No. 2 intermediate shaft, and the protective bushing is conveniently positioned on the bolt hole of the flange through the limit plate.

[0050] Exemplarily, the combined surface roughness Ra=0.8 between the distance pad column 14, the distance adjusting pad column 24, the first protective bushing 15, the second protective bushing 16, the third protective bushing 25 and the second protective bushing 16 and the front end flange 41 of the No. 2 intermediate shaft, the flange 31 of the large gear shaft of the gearbox, the flange 61 of the No. 1 intermediate shaft and the rear end flange 42 of the No. 2 intermediate shaft ensures that the connection between the first coupling fixture 1 and the second coupling fixture 2 and the front end flange 41 of the No. 2 intermediate shaft, the flange 31 of the large gear shaft of the gearbox, the flange 61 of the No. 1 intermediate shaft and the rear end flange 42 of the No. 2 intermediate shaft is stable and not easy to slip.

[0051] Furthermore, the hardness of the distance pad column 14, the distance adjusting pad column 24, the first protective bushing 15, the second protective bushing 16, the third protective bushing 25 and the second protective bushing 16 are all lower than the hardness of the front end flange 41 of the No. 2 intermediate shaft, the flange 31 of the large gear shaft of the gear box, the flange 61 of the No. 1 intermediate shaft and the rear end flange 42 of the No. 2 intermediate shaft. The distance pad column 14, the distance adjusting pad column 24, the first protective bushing 15, the second protective bushing 16, the third protective bushing 25 and the second protective bushing 16 can be made of copper material, and the material of the first screw 11 and the second screw 21 can be the same as the material of the fastening bolts 321 on the flange fastener 32.

[0052] Preferably, in step 4, before the front end flange 41 of the No. 2 intermediate shaft and the flange 31 of the gearbox gear shaft are closed, the inner end surface of the front end flange 41 of the No. 2 intermediate shaft and the inner end surface of the flange 31 of the gearbox gear shaft are cleaned, and a flange connection O-ring 43 is placed. In step 6, the inner end surface of the flange 61 of the No. 1 intermediate shaft and the inner end surface of the rear end flange 42 of the No. 2 intermediate shaft and the adjustment ring 5 are cleaned, and a flange connection O-ring 43 is placed to prevent impurities between the shaft segment flanges from affecting the sealing degree.

[0053] In summary, the present invention connects the No. 2 intermediate shaft 4 and the large gear shaft 3 of the gear box through the first coupling fixture 1, and connects the No. 1 intermediate shaft 6 and the No. 2 intermediate shaft 4 through the second coupling fixture 2, and the distance between the flange 61 of the No. 1 intermediate shaft and the rear end flange 42 of the No. 2 intermediate shaft can be adjusted through the spacing pad column 24; moreover, the axis shifting is convenient, and there is no need to set up a temporary adjustment bracket when the shaft sections are connected, which reduces the workload of shaft section connection preparation and removal, and can effectively control the opening value and offset value between the shaft sections, and can avoid the occurrence of large bending quality problems of the oil pipe 10 in the adjustable pitch propeller shaft, and the overall shaft section connection method is simple to operate and has high safety; the first coupling fixture 1 and the second coupling fixture 2 have the advantages of simple structure, simple production, and convenient operation, and can realize the safe connection of the flange-type shaft section of the ship's adjustable pitch propeller 9 shaft system at an extremely low cost.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for connecting a ship's controllable pitch propeller shaft system, wherein the controllable pitch propeller shaft system comprises a controllable pitch propeller, a propeller shaft, a rear hydraulic coupling, a tail shaft, a front hydraulic coupling, a distance ring, a No. 1 intermediate shaft, an adjustment ring, a No. 2 intermediate shaft and a gearbox gear shaft connected in sequence, characterized in that: The following steps are involved: Step 1, perform an open shafting segment alignment operation on the controllable pitch propeller shafting. After the alignment is completed, install and connect the propeller shaft, the rear hydraulic coupling, the tail shaft, the front hydraulic coupling, the distance ring, and the No. 1 intermediate shaft; Step 2, installing a first shaft coupling fixture between the front end flange of the No. 2 intermediate shaft and the flange of the large gear shaft of the gear box, the first shaft coupling fixture comprising a first screw, a first locking nut, a second locking nut and a distance washer, the distance washer being clamped between the front end flange of the No. 2 intermediate shaft and the flange of the large gear shaft of the gear box, the first screw passing through the bolt hole of the front end flange of the No. 2 intermediate shaft, the inner cavity of the distance washer and the bolt hole of the flange of the large gear shaft of the gear box, the first locking nut being tightened and fixed to one end of the screw and pressed against the front end flange of the No. 2 intermediate shaft, the second locking nut being tightened and fixed to the other end of the screw and pressed against the flange of the large gear shaft of the gear box; the number of bolt holes in the front end flange of the No. 2 intermediate shaft is greater than the number of the first shaft coupling fixture installed on the front end flange of the No. 2 intermediate shaft; A second shaft coupling fixture is installed between the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft, the second shaft coupling fixture comprising a second screw, a third locking nut, a fourth locking nut and a spacing pad column, the second screw passes through the bolt hole of the No. 1 intermediate shaft, the inner cavity of the spacing pad column and the bolt hole of the rear end flange of the No. 2 intermediate shaft, the third locking nut is tightened and fixed to one end of the second screw and pressed against the flange of the No. 1 intermediate shaft, the fourth locking nut is tightened and fixed to the other end of the second screw and pressed against the rear end flange of the No. 2 intermediate shaft, and the number of bolt holes in the flange of the No. 1 intermediate shaft is greater than the number of the second shaft coupling fixture installed on the flange of the No. 1 intermediate shaft; Step 3, butt-connecting the oil pipe in the controllable pitch propeller shaft in the No. 1 intermediate shaft with the oil pipe in the controllable pitch propeller shaft in the No. 2 intermediate shaft, butt-connecting the oil pipe in the controllable pitch propeller shaft in the No. 2 intermediate shaft with the oil pipe in the controllable pitch propeller shaft in the large gear shaft of the gearbox, and performing a tightness test on the oil pipe in the controllable pitch propeller shaft; Step 4: After the tightness test of the oil pipe in the controllable pitch propeller shaft is passed, the first coupling fixture is installed on the bolt hole between the front end flange of the No. 2 intermediate shaft and the flange of the gearbox large gear shaft where the first coupling fixture is not installed; the distance pad column on the first coupling fixture is removed, and all the first locking nuts and the second locking nuts are tightened to close the front end flange of the No. 2 intermediate shaft and the flange of the gearbox large gear shaft, and the first coupling fixtures are removed one by one and flange fasteners are installed between the front end flange of the No. 2 intermediate shaft and the flange of the gearbox large gear shaft at the same time. After all the first coupling fixtures are replaced with flange fasteners, the connection between the No. 2 intermediate shaft and the gearbox large gear shaft is completed; Step 5, completely dismantle the second shaft coupling tooling located at the lower part between the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft, and install the second shaft coupling tooling at all the bolt holes located at the upper part between the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft, and adjust the length of the spacing column so that the distance between the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft is greater than the length of the adjustment ring by 2 mm to 3 mm; Step 6, installing the lower part of the adjusting ring at the lower part between the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft, and preliminarily fastening the flange of the No. 1 intermediate shaft, the lower part of the adjusting ring and the rear end flange of the No. 2 intermediate shaft by means of flange fasteners; Step 7, remove all the second coupling tools, install the upper part of the adjusting ring on the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft, connect the upper part of the adjusting ring with the lower part of the adjusting ring, fasten the flange of the No. 1 intermediate shaft, the upper part of the adjusting ring and the rear end flange of the No. 2 intermediate shaft with flange fasteners, and tighten and fix all flange fasteners on the flange of the No. 1 intermediate shaft, the lower part of the adjusting ring and the rear end flange of the No. 2 intermediate shaft; Step 8: After the installation of the oil distributor of the controllable pitch propeller is completed, a low-pressure tightness test is performed on the inner hole of the controllable pitch propeller shaft system and a high-pressure tightness test is performed on the oil pipe inside the controllable pitch propeller shaft system.

2. The method for connecting a ship's controllable pitch propeller shaft system according to claim 1, characterized in that: The distance-adjusting washer column comprises an externally threaded washer and an internally threaded washer. The externally threaded washer is provided with a connecting section, the outer periphery of the connecting section is provided with external threads, and the internally threaded washer is provided with an internally threaded hole threadedly connected to the connecting section.

3. The method for connecting a ship's controllable pitch propeller shaft system according to claim 1, characterized in that: The first coupling tool also includes a first protective bushing and a second protective bushing, the first protective bushing is inserted into the bolt hole on the front end flange of the No. 2 intermediate shaft, and the second protective bushing is inserted into the bolt hole of the flange of the large gear shaft of the gear box; the second coupling tool also includes a third protective bushing and a fourth protective bushing, the third protective bushing is inserted into the bolt hole on the flange of the No. 1 intermediate shaft, and the fourth protective bushing is inserted into the bolt hole on the rear end flange of the No. 2 intermediate shaft.

4. The method for connecting a ship's controllable pitch propeller shaft system according to claim 3, characterized in that: The first protective bushing is provided with a first limit plate which abuts against the outer end face of the front end flange of the No. 2 intermediate shaft, the second protective bushing is provided with a second limit plate which abuts against the outer end face of the flange of the large gear shaft of the gear box, the third protective bushing is provided with a third limit plate which abuts against the outer end face of the flange of the No. 1 intermediate shaft, and the fourth protective bushing is provided with a fourth limit plate which abuts against the outer end face of the rear end flange of the No. 2 intermediate shaft.

5. The method for connecting a ship's controllable pitch propeller shaft system according to claim 3, characterized in that: The combined surface roughness of the distance pad column, the distance adjusting pad column, the first protective bushing, the second protective bushing, the third protective bushing and the second protective bushing and the front end flange of the No. 2 intermediate shaft, the flange of the large gear shaft of the gear box, the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft is Ra=0.

8.

6. The method for connecting a ship's controllable pitch propeller shaft system according to claim 3, characterized in that: The hardness of the distance pad column, the distance adjusting pad column, the first protective bushing, the second protective bushing, the third protective bushing and the second protective bushing are all lower than the hardness of the front end flange of the No. 2 intermediate shaft, the flange of the large gear shaft of the gear box, the flange of the No. 1 intermediate shaft and the rear end flange of the No. 2 intermediate shaft.

7. The method for connecting a ship's controllable pitch propeller shaft system according to claim 1, characterized in that: In step 4, before the front end flange of the No. 2 intermediate shaft and the flange of the gearbox gear shaft are closed, the inner end surface of the front end flange of the No. 2 intermediate shaft and the inner end surface of the flange of the gearbox gear shaft are cleaned.

8. The method for connecting a ship's controllable pitch propeller shaft system according to claim 1, characterized in that: In step 6, the inner end surface of the flange of the No. 1 intermediate shaft, the inner end surface of the rear end flange of the No. 2 intermediate shaft, and the adjusting ring are cleaned.

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