Split type three-layer combined expansion sleeve mounting device and mounting method thereof

Abstract

The present application belongs to the technical field of expansion sleeve installation, in particular to a split type three-layer combined expansion sleeve installation device and method thereof, comprising a rotating shaft, a lower half expansion sleeve assembly, an upper half expansion sleeve assembly, a positioning and fixing mechanism and a hoisting auxiliary mechanism, the lower half expansion sleeve assembly is composed of a lower half expansion sleeve outer sleeve, a lower half expansion sleeve middle sleeve and a lower half expansion sleeve inner sleeve, which are coaxially assembled and have flush end faces. The present application reduces the hoisting frequency in the cabin by pre-assembling the lower half expansion sleeve assembly, avoids the interference problem of hand-pulled down chains, reduces the risk of part collision damage, improves the operation safety, uses the auxiliary fixing structure composed of an expansion sleeve hoop, a jacking bolt and a copper top block to replace the traditional pure hoisting positioning mode, solves the problem of tight operation space below the main shaft, optimizes the assembly sequence of the three-layer expansion sleeve, greatly shortens the assembly time, and ensures the expansion sleeve connection strength through the double fastening of the joint bolt and the tension bolt, effectively preventing slipping during operation.

Description

Technical Field

[0001] This invention relates to the field of expansion sleeve installation technology, and in particular to an installation device and method for a split-type three-layer combined expansion sleeve. Background Technology

[0002] The split-type expansion sleeve is a key component in shipbuilding and old ship renovation, which is used in conjunction with low-speed shaft-mounted permanent magnet synchronous generators. Traditional expansion sleeves mostly adopt a two-layer design with inner and outer sleeves. Although the installation and operation inside the ship's cabin are relatively simple, after long-term operation, the expansion sleeve is prone to slippage due to insufficient torque transmission, which affects the stable operation of the equipment.

[0003] To address the slippage issue, a split-type three-layer combination expansion sleeve (including an outer sleeve, a middle sleeve, and an inner sleeve) has emerged in the industry; however, the existing installation method has significant drawbacks: First, the confined space inside the ship's hold only allows for manual chain hoisting, which makes the chain hoist prone to interference when hoisting the lower half of the expansion sleeve. Second, the lower half of the stator base is already installed directly below the main shaft, further limiting the operating space. Third, the three-layer expansion sleeve has a large number of parts, and assembling it in the conventional order of "installing the lower half outer sleeve - middle sleeve - inner sleeve, then installing the upper half inner sleeve - middle sleeve - outer sleeve" is not only labor-intensive but also prone to damaging the windings, seriously affecting assembly efficiency and quality. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an installation device and method for a split-type three-layer combined expansion sleeve, which overcomes the deficiencies of existing technologies and effectively solves the problems of interference during hoisting of three-layer combined expansion sleeves in ship cabins, limited operating space, low assembly efficiency, and easy damage to components.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An installation device for a split-type three-layer combined expansion sleeve includes a rotating shaft, a lower half expansion sleeve assembly, an upper half expansion sleeve assembly, a positioning and fixing mechanism, and a hoisting auxiliary mechanism; The lower half expansion sleeve assembly consists of a lower half expansion sleeve outer sleeve, a lower half expansion sleeve middle sleeve, and a lower half expansion sleeve inner sleeve, which are coaxially assembled and have flush end faces. The upper expansion sleeve assembly consists of an upper expansion sleeve outer sleeve, an upper expansion sleeve middle sleeve, and an upper expansion sleeve inner sleeve. Its size matches that of the lower expansion sleeve assembly, and together they enclose and form a complete three-layer expansion sleeve structure. The positioning and fixing mechanism includes two sets of end face pressure plates, multiple sets of tension bolts and multiple sets of joint bolts. The end face pressure plates are attached to both ends of the lower half expansion sleeve assembly. The tension bolts pass through the end face pressure plates and the lower half expansion sleeve assembly to achieve axial fixation. The joint bolts are used to connect the joint of the upper and lower half expansion sleeve assemblies. The hoisting auxiliary mechanism includes an expansion sleeve clamp, three sets of tightening bolts, three sets of copper top blocks, and two sets of connecting bolts. The expansion sleeve clamp is semi-circular and can be detachably connected to the lower half of the expansion sleeve outer sleeve by the connecting bolts. The tightening bolts are evenly screwed onto the outer circle of the expansion sleeve clamp. The copper top blocks are fixed to the end of the tightening bolts near the rotating shaft, and the copper top blocks are adapted to the outer wall of the rotating shaft.

[0006] Preferably, the inner diameters of the lower half-expansion sleeve outer sleeve, the lower half-expansion sleeve middle sleeve, and the lower half-expansion sleeve inner sleeve decrease sequentially, and the fitting clearance between adjacent components does not exceed 0.1mm to ensure torque transmission stability.

[0007] Preferably, the copper top block has an arc-shaped groove on the side near the rotating shaft, and the arc of the groove is consistent with the arc of the outer circle of the rotating shaft to avoid damage to the surface of the rotating shaft when tightening.

[0008] Preferably, the end face pressure plate is made of No. 45 steel, and a clearance hole adapted to the rotating shaft is opened in the center. The inner wall of the clearance hole is provided with a wear-resistant coating to prevent wear during assembly.

[0009] Preferably, the thickness of the expansion sleeve clamp is not less than 15mm, and its inner wall is covered with a rubber buffer layer to reduce collision damage when it comes into contact with the lower half of the expansion sleeve outer sleeve.

[0010] Preferably, the joint bolts are evenly distributed along the joint of the upper and lower half-expansion sleeve assemblies, and the distance between adjacent joint bolts does not exceed 100mm to ensure connection strength.

[0011] Preferably, the length of the tightening bolt satisfies the following condition: when the tightening bolt is fully screwed in, the copper top block can fit tightly against the outer wall of the rotating shaft, and the tightening force can be adjusted by a torque wrench.

[0012] A method for installing a split-type three-layer combined expansion sleeve includes the following steps: S1: Pre-assembled lower half-expansion sleeve assembly The lower half expansion sleeve outer sleeve, the lower half expansion sleeve middle sleeve, and the lower half expansion sleeve inner sleeve are coaxially fitted together to ensure that the end faces of the three are flush; a set of end face pressure plates are attached to each end face of the component, tension bolts are inserted and tightened to make the lower half expansion sleeve component form a stable whole and avoid component misalignment during subsequent hoisting. S2: Hoist the lower half of the assembly and connect the clamps. Use two sets of hand-operated chain hoists to lift the pre-assembled lower half of the expansion sleeve assembly directly above the rotating shaft, keeping the chain hoists under tension and preventing the ropes from slackening; slide the expansion sleeve clamp from below the rotating shaft to the position corresponding to the lower half of the expansion sleeve outer sleeve, and fix the two together with connecting bolts to ensure that the expansion sleeve clamp 8 is coaxial with the lower half of the expansion sleeve assembly; S3: Tighten and remove the chain hoist. Install the tightening bolts and copper top blocks in sequence in the screw holes on the outer circle of the expansion sleeve clamp. Tighten the three sets of tightening bolts evenly with a torque wrench until the copper top blocks are tightly fitted to the outer wall of the shaft. After checking that the position of the lower half expansion sleeve assembly is correct, remove the two sets of hand-operated chains. At this time, the lower half expansion sleeve assembly is fixed on the shaft by the tightening bolts and copper top blocks. S4: Rotate the shaft to the target position The rotating shaft is slowly rotated 180° by the turning equipment, which drives the lower half of the expansion sleeve assembly to rotate synchronously to the bottom of the shaft, and the expansion sleeve clamp rotates to the top of the shaft. The hand chain hoists are reinstalled on both sides of the expansion sleeve clamp and tightened to ensure the stability of the lower half of the expansion sleeve assembly. S5: Remove auxiliary components and install the upper expansion sleeve. Remove the connecting bolts, expansion sleeve clamps, tightening bolts and copper top blocks in sequence, and then remove the end face pressure plate and tension bolts; install the upper expansion sleeve assembly on the outside of the rotating shaft and the lower expansion sleeve assembly in the order of "upper half expansion sleeve inner sleeve - upper half expansion sleeve middle sleeve - upper half expansion sleeve outer sleeve", ensuring that the upper and lower components are aligned. S6: Tighten and complete installation Insert the joint bolts into the joints of the upper and lower half expansion sleeve assemblies and tighten them evenly. Check that the gap at all joints does not exceed 0.05mm. Finally, reinstall the tension bolts at both ends of the expansion sleeve along the axial direction and tighten them to the specified torque to complete the installation of the split three-layer combined expansion sleeve.

[0013] The beneficial effects of this invention are as follows: The installation device and method for the split three-layer combined expansion sleeve of the present invention integrates the upper half expansion sleeve outer sleeve, upper half expansion sleeve middle sleeve, upper half expansion sleeve middle sleeve and lower half expansion sleeve outer sleeve, lower half expansion sleeve middle sleeve and lower half expansion sleeve inner sleeve into a single lifting assembly by pre-assembling the lower half expansion sleeve assembly. This reduces the number of lifting operations in the ship's hold, avoids interference problems caused by manual chain hoisting, and reduces the risk of collision damage to parts, thereby improving operational safety. The installation device and method of the split three-layer combined expansion sleeve of the present invention utilizes an auxiliary fixing structure composed of expansion sleeve clamps, tightening bolts and copper top blocks to replace the traditional pure hoisting positioning method. It can stably fix the lower half of the expansion sleeve assembly during the rotation of the shaft, solves the problem of tight operating space below the main shaft, and the copper top blocks can avoid damaging the surface of the shaft. The installation device and method for the split-type three-layer combined expansion sleeve of the present invention optimizes the assembly sequence of the three-layer expansion sleeve through the process of "pre-assembly-rotation positioning-step installation", which greatly shortens the assembly time. At the same time, the double fastening of the joint bolt and the tension bolt ensures the connection strength of the expansion sleeve and effectively prevents slippage during operation. Attached Figure Description

[0014] Figure 1A schematic diagram of the expansion sleeve installation structure for an installation device and method for a split-type three-layer combined expansion sleeve proposed in this invention. Figure 1 ; Figure 2 A schematic diagram of the expansion sleeve installation structure for an installation device and method for a split-type three-layer combined expansion sleeve proposed in this invention. Figure 2 ; Figure 3 This is a schematic diagram of the structure of the installation device and method for a split-type three-layer combined expansion sleeve proposed in this invention after the expansion sleeve is installed. Figure 1 ; Figure 4 This is a schematic diagram of the structure of the installation device and method for a split-type three-layer combined expansion sleeve proposed in this invention after the expansion sleeve is installed. Figure 2 .

[0015] In the diagram: 1. Upper half expansion sleeve outer sleeve; 2. Upper half expansion sleeve middle sleeve; 3. Upper half expansion sleeve inner sleeve; 4. End face pressure plate; 5. Lower half expansion sleeve outer sleeve; 6. Lower half expansion sleeve middle sleeve; 7. Lower half expansion sleeve inner sleeve; 8. Expansion sleeve clamp; 9. Copper top block; 10. Tightening bolt; 11. Tensioning bolt; 12. Connecting bolt; 13. Rotating shaft. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0017] Reference Figures 1-4 Example 1: An installation device for a split-type three-layer combined expansion sleeve. The assembly accuracy of the lower expansion sleeve assembly directly affects the stability of subsequent installation. During pre-assembly, a dial indicator is required to check the coaxiality of the lower expansion sleeve outer sleeve 5, the lower expansion sleeve middle sleeve 6, and the lower expansion sleeve inner sleeve 7 to ensure that the deviation does not exceed 0.03mm. When the end face pressure plate 4 is attached to the end face of the assembly, sealant must be applied to prevent seawater or oil from seeping into the interior of the expansion sleeve during ship operation.

[0018] In this embodiment, the sealant is selected as oil-resistant and high-temperature resistant, and the curing time is no more than 2 hours. This ensures the sealing performance without affecting the efficiency of subsequent removal of auxiliary components. The tightening torque of the tension bolt 11 needs to be set according to the design requirements, generally 80-100 N·m, to avoid excessive torque causing deformation of the expansion sleeve or insufficient torque causing the assembly to loosen.

[0019] In Example 2, the copper top block 9 in the hoisting auxiliary mechanism plays a key role in positioning and protection. The fit between its arc-shaped groove and the rotating shaft 13 needs to reach more than 95%. During installation, a small amount of grease can be applied to the surface of the copper top block 9 to reduce the frictional resistance between it and the rotating shaft 13 during rotation. When tightening the top bolt 10, a "diagonal step" method should be used, with the torque increasing by 20 N·m each time, until the specified value (usually 50-60 N·m) is reached to prevent excessive local force from damaging the rotating shaft 13.

[0020] In this embodiment, marine-specific lithium-based grease is selected as the lubricant, which can maintain stable performance in seawater environment; when the expansion sleeve clamp 8 is connected to the lower half expansion sleeve outer sleeve 5, the connecting bolt 12 needs to be equipped with a spring washer to prevent the bolt from loosening due to ship vibration.

[0021] In Example 3, when installing the upper half of the expansion sleeve assembly, impurities at the joint between the upper and lower half of the expansion sleeve assembly must be cleaned first and wiped clean with alcohol. Before installing the joint bolts, anti-seize agent must be applied to the threads to prevent the bolts from seizing with the expansion sleeve after long-term use, making disassembly difficult. After all bolts are installed, a rotation test must be performed. Rotate the shaft 13 360° to check that the expansion sleeve is free from jamming and abnormal noise, and that the radial runout does not exceed 0.05mm to ensure that the installation is qualified.

[0022] In this embodiment, the anti-seize agent is copper-based and has a temperature range of -50℃ to 600℃, which is suitable for the temperature environment of the ship's engine room. During the cranking test, the torque change of the rotating shaft 13 needs to be recorded to ensure that the torque is stable and there is no obvious fluctuation, indicating that the expansion assembly is normal.

[0023] Working principle: When installing a split-type three-layer combined expansion sleeve inside a ship's hull, the lower half of the expansion sleeve, including the outer sleeve 5, the middle sleeve 6, and the inner sleeve 7, is first pre-assembled into a stable assembly, reducing the number of hoisting operations and the risk of interference. Then, using an auxiliary structure consisting of the expansion sleeve clamp 8, the tightening bolt 10, and the copper top block 9, the lower half assembly is temporarily fixed directly above the rotating shaft 13. It is then precisely moved to directly below the rotating shaft 13 by rotating the machine (avoiding the blind spot of the stator base). Finally, the expansion sleeve clamp 8, copper top block 9, tightening bolt 10, tension bolt 11, and seam bolts are removed, and the upper half of the expansion sleeve, including the outer sleeve 1, the middle sleeve 2, and the inner sleeve 3, is installed in sequence. The entire assembly is then tightened using the seam bolts and tension bolts 11, ensuring both assembly accuracy and safety while significantly improving installation efficiency.

[0024] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An installation device for a split-type three-layer combined expansion sleeve, comprising a rotating shaft (13), characterized in that, It also includes a lower half expansion sleeve assembly, an upper half expansion sleeve assembly, a positioning and fixing mechanism, and a hoisting auxiliary mechanism; The lower half expansion sleeve assembly consists of a lower half expansion sleeve outer sleeve (5), a lower half expansion sleeve middle sleeve (6), and a lower half expansion sleeve inner sleeve (7), which are coaxially assembled and have flush end faces; The upper expansion sleeve assembly consists of an upper expansion sleeve outer sleeve (1), an upper expansion sleeve middle sleeve (2), and an upper expansion sleeve inner sleeve (3), the size of which matches the lower expansion sleeve assembly, together forming a complete three-layer expansion sleeve structure; The positioning and fixing mechanism includes two sets of end face pressure plates (4), multiple sets of tension bolts (11) and multiple sets of joint bolts. The end face pressure plates (4) are attached to both ends of the lower half expansion sleeve assembly. The tension bolts (11) pass through the end face pressure plates (4) and are axially fixed to the lower half expansion sleeve assembly. The joint bolts are used to connect the joint of the upper and lower half expansion sleeve assemblies. The hoisting auxiliary mechanism includes an expansion sleeve clamp (8), three sets of tightening bolts (10), three sets of copper top blocks (9) and two sets of connecting bolts (12). The expansion sleeve clamp (8) is semi-circular and can be detachably connected to the lower half of the expansion sleeve outer sleeve (5) through the connecting bolts (12). The tightening bolts (10) are evenly screwed onto the outer circle of the expansion sleeve clamp (8). The copper top blocks (9) are fixed to one end of the tightening bolts (10) near the rotating shaft (13), and the copper top blocks (9) are adapted to the outer wall of the rotating shaft (13).

2. The installation device for a split-type three-layer combined expansion sleeve according to claim 1, characterized in that, The inner diameters of the lower half-expansion sleeve outer sleeve (5), the lower half-expansion sleeve middle sleeve (6), and the lower half-expansion sleeve inner sleeve (7) decrease sequentially, and the fitting clearance between adjacent components does not exceed 0.1mm, ensuring the stability of torque transmission.

3. The installation device for a split-type three-layer combined expansion sleeve according to claim 1, characterized in that, The copper top block (9) has an arc-shaped groove on the side near the rotating shaft (13). The arc of the groove is consistent with the arc of the outer circle of the rotating shaft (13) to avoid damaging the surface of the rotating shaft (13) when tightening.

4. The installation device for a split-type three-layer combined expansion sleeve according to claim 1, characterized in that, The end face pressure plate (4) is made of No. 45 steel, and a clearance hole adapted to the rotating shaft (13) is provided in the center. The inner wall of the clearance hole is provided with a wear-resistant coating to prevent wear during assembly.

5. The installation device for a split-type three-layer combined expansion sleeve according to claim 1, characterized in that, The thickness of the expansion sleeve clamp (8) is not less than 15mm, and its inner wall is pasted with a rubber buffer layer to reduce collision damage when it comes into contact with the lower half of the expansion sleeve outer sleeve (5).

6. The installation device for a split-type three-layer combined expansion sleeve according to claim 1, characterized in that, The joint bolts are evenly distributed along the joint of the upper and lower half-expansion sleeve assemblies, and the distance between adjacent joint bolts does not exceed 100mm to ensure connection strength.

7. The installation device for a split-type three-layer combined expansion sleeve according to claim 1, characterized in that, The length of the tightening bolt (10) satisfies the following condition: when the tightening bolt (10) is fully screwed in, the copper top block (9) can fit tightly against the outer wall of the rotating shaft (13), and the tightening force can be adjusted by a torque wrench.

8. A method for installing a split-type three-layer combined expansion sleeve, comprising the installation device for a split-type three-layer combined expansion sleeve according to any one of claims 1-7, characterized in that, Includes the following steps: S1: Pre-assembled lower half-expansion sleeve assembly The lower half expansion sleeve outer sleeve (5), the lower half expansion sleeve middle sleeve (6), and the lower half expansion sleeve inner sleeve (7) are coaxially fitted together to ensure that the end faces of the three are flush; a set of end face pressure plates (4) are attached to each end face of the component, and tension bolts (11) are inserted and tightened to make the lower half expansion sleeve component form a stable whole and avoid component misalignment during subsequent hoisting. S2: Hoist the lower half of the assembly and connect the clamps. Using two sets of hand-operated chain hoists, the pre-assembled lower half expansion sleeve assembly is hoisted and placed directly above the rotating shaft (13), keeping the chain hoists under tension and preventing the ropes from loosening; the expansion sleeve clamp (8) is slid from below the rotating shaft (13) to the position corresponding to the lower half expansion sleeve outer sleeve (5), and the two are fixed by connecting bolts (12) to ensure that the expansion sleeve clamp (8) and the lower half expansion sleeve assembly are coaxial; S3: Tighten and remove the chain hoist. Install the tightening bolts (10) and copper top blocks (9) in sequence in the screw holes on the outer circle of the expansion sleeve clamp (8). Tighten the three sets of tightening bolts (10) evenly with a torque wrench until the copper top blocks (9) are tightly fitted to the outer wall of the rotating shaft (13). After checking that the position of the lower half expansion sleeve assembly is correct, remove the two sets of hand-operated chains. At this time, the lower half expansion sleeve assembly is fixed on the rotating shaft (13) by the tightening bolts (10) and copper top blocks (9). S4: Rotate the pivot (13) to the target position The rotating shaft (13) is slowly rotated 180° by the rotating equipment, which drives the lower half of the expansion sleeve assembly to rotate synchronously to the bottom of the rotating shaft (13), and the expansion sleeve clamp (8) rotates to the top of the rotating shaft (13); the hand chain hoists are reinstalled on both sides of the expansion sleeve clamp (8) and tightened to ensure the stability of the lower half of the expansion sleeve assembly; S5: Remove auxiliary components and install the upper expansion sleeve. Remove the connecting bolt (12), expansion sleeve clamp (8), tightening bolt (10) and copper top block (9) in sequence, and then remove the end face pressure plate (4) and tightening bolt (11); in the order of "upper half expansion sleeve inner sleeve (3) - upper half expansion sleeve middle sleeve (2) - upper half expansion sleeve outer sleeve (1)", install the upper half expansion sleeve assembly on the outside of the rotating shaft (13) and the lower half expansion sleeve assembly respectively, and ensure that the upper and lower components are aligned; S6: Tighten and complete installation Insert the joint bolts into the joint of the upper and lower half of the expansion sleeve assembly and tighten them evenly. Check that the gap at all joints does not exceed 0.05mm. Finally, reinstall the tension bolts (11) at both ends of the expansion sleeve in the axial direction and tighten them to the specified torque to complete the installation of the split three-layer combined expansion sleeve.

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