A method for assembling split annular parts of a horizontal hydraulic generator unit

Abstract

The present invention discloses a method for assembling split annular parts of a horizontal hydraulic generator set. The steps are as follows: install pulleys on the lifting frame - fix the relative positions of the two pulleys with connecting plates - install lifting rings on the split parts - connect the crane to the lifting frame - connect the hook of the manual hoist to the lifting frame - connect the hook of the manual hoist to the lifting ring of the split part - hoist the split part - push and pull the split part to move it by using the pulley - assemble the whole circle on the workpiece - assemble the whole split part and the workpiece. The present invention can use a crane to hoist two split parts simultaneously, and use a pulley to easily realize the method of assembling the split parts by moving and forming a circle, effectively solving the main problems of difficult manual assembly of heavy split parts and low efficiency.

Description

Technical Field

[0001] The present invention relates to the field of mechanical installation, and particularly relates to a method for assembling split annular parts of a horizontal hydro-generating unit. Background Art

[0002] The tubular hydro-generating unit is a relatively common type of unit. Different from the Francis turbine unit with a vertical distribution represented by Baihetan, the tubular hydro-generating unit is horizontally distributed, that is, the center line of the unit is parallel to the ground. Currently, when assembling the split parts of a horizontal unit in a hydropower station, in the vertical single-split state, after the first split workpiece is unloaded from the crane and placed in position, there is no bearing point for stable placement. It is necessary to horizontally lay and firmly support the first split part; then lift and lower another split workpiece, align it with the horizontally placed first split workpiece and assemble it into a circle, and then adjust the position of the workpiece after assembling into a circle in the circumferential direction by means of external forces such as jacks. After meeting the installation position requirements, perform overall assembly and fastening with the mating workpieces.

[0003] Due to the limitations of the installation position and method of the workpiece, the crane can only be used as partial auxiliary bearing in this assembly method. The horizontal placement of the first split, the assembly of the two splits into a circle, and the overall adjustment and installation process are mainly completed manually by using a chain block or a jack, etc. It has the characteristics of difficult installation, long cycle, low efficiency, and easy injury to personnel. Moreover, the workpiece is in a state without a stable bearing point during the process of assembling into a circle, which is likely to cause quality problems such as strangulation, scratching, and bruising, affecting the quality of the unit product.

[0004] Therefore, in order to solve the above problems, it is necessary to provide a method for assembling split annular parts of a horizontal hydro-generating unit that is convenient for lifting, convenient for assembly, has strong versatility, reduces labor intensity, improves efficiency, and better guarantees the installation quality. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for assembling split annular parts that is convenient for lifting, convenient for assembly, has strong versatility, reduces labor intensity, improves efficiency, and better guarantees the installation quality. The technical solution of the present invention is as follows:

[0006] 1) Pulley I and Pulley II are assembled onto the slide rail I of the lifting frame, and Pulley III and Pulley IV are assembled onto the slide rail II of the lifting frame;

[0007] 2) Connecting plate I is assembled with Pulley I and Pulley II, and fastened with bolts;

[0008] 3) Connecting plate II is assembled with Pulley III and Pulley IV, and fastened with bolts;

[0009] 4) Two outer-circle lifting holes on the left side of the split annular part are respectively assembled with lifting ring I and lifting ring II;

[0010] 5) Two outer-circle lifting holes on the right side of the split annular part are respectively assembled with lifting ring III and lifting ring IV;

[0011] 6) Connect the hook of the crane with the lifting point of the lifting frame;

[0012] 7) Connect the hook Ⅰ of the chain block Ⅰ with the pulley Ⅰ, connect the hook Ⅱ of the chain block Ⅱ with the pulley Ⅱ, connect the hook Ⅲ of the chain block Ⅲ with the pulley Ⅲ, and connect the hook Ⅳ of the chain block Ⅳ with the pulley Ⅳ;

[0013] 8) Move the crane to displace the lifting frame above the split ring-shaped part, use the hook of the chain block Ⅰ to connect with the lifting ring Ⅰ, use the hook of the chain block Ⅱ to connect with the lifting ring Ⅱ, use the hook of the chain block Ⅲ to connect with the lifting ring Ⅲ, and use the hook of the chain block Ⅳ to connect with the lifting ring Ⅳ;

[0014] 9) Slowly raise the hook of the crane to lift the left and right petals of the split ring-shaped part into the air, and adjust the perpendicularity of the split surface Ⅰ and split surface Ⅱ of the workpiece to the ground plane by adjusting the distance of the lifting chain of the chain block;

[0015] 10) Lift and move the left and right petals of the split ring-shaped part above the horizontal workpiece;

[0016] 11) Drive the pulley Ⅰ and pulley Ⅱ to move on the slide rail of the lifting frame to the left side of the workpiece by moving the left petal of the split ring-shaped part;

[0017] 12) Drive the pulley Ⅲ and pulley Ⅳ to move on the slide rail of the lifting frame to the right side of the workpiece by moving the right petal of the split ring-shaped part;

[0018] 13) After the crane slowly lowers the split ring-shaped part to both sides of the workpiece, move the left and right petals of the split ring-shaped part towards the central workpiece respectively until the split surface Ⅰ is aligned and closely attached to the split surface Ⅱ;

[0019] 14) Carry out the butting assembly of the left and right petals of the split ring-shaped part at the positions of the split surface Ⅰ and split surface Ⅱ;

[0020] 15) Carry out the butting assembly of the integral split ring-shaped part and the workpiece.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. Optimize the on-site installation process of the split ring-shaped part. The two split ring-shaped parts are hoisted and installed simultaneously and always in a stable state under the force of the crane. Through the pulley, the installer only needs to exert a little force to easily realize the parallel movement and circular assembly of the two petals of the workpiece. The operation is simple, which greatly reduces the high-intensity labor of assembling large-weight workpieces into a circle, improves work efficiency, avoids the situation of easy bumping and scratching of the workpiece during the installation process, and ensures the quality of the unit.

[0023] 2. The assembly method provided by the present invention is novel, practical, simple in structure, low in manufacturing cost, highly versatile, and can be widely applied to the circular assembly and disassembly of all split parts. Description of the Drawings

[0024] Figure 1 It is a front view schematic diagram of lifting the split part of the present invention.

[0025] Figure 2 It is a sectional view taken along line A-A of the front view schematic diagram of lifting the split part of the present invention.

[0026] Explanation of the reference numerals in the figure: 1 - lifting hook; 2 - lifting frame; 3 - lifting point; 4 - slide rail I; 5 - slide rail II; 6 - chain block I; 7 - chain block II; 8 - chain block III; 9 - chain block IV; 10 - lifting ring I; 11 - lifting ring II; 12 - lifting ring III; 13 - lifting ring IV; 14 - left flap of the split ring-shaped part; 15 - right flap of the split ring-shaped part; 16 - workpiece; 17 - bolt; 18 - connecting plate I; 19 - connecting plate II; 20 - pulley I; 21 - pulley II; 22 - pulley III; 23 - pulley IV; 24 - lifting hook I; 25 - lifting hook II; 26 - lifting hook III; 27 - lifting hook IV; 28 - split surface I; 29 - split surface II. Detailed Implementation Manner

[0027] Taking the assembly of the cover of a tubular turbine generator set in a hydropower station as an example, the process of applying the method of the present invention for assembly is described as follows: The water turbine main shaft of this unit has been installed and completed at the horizontal placement station. The next step is to install the split part cover. The cover needs to be sleeved on the shaft body, bolted together to form a complete circle, and then the whole is bolted and assembled with the main shaft. The cover weighs 800 KG, has a diameter of 1.2 M, and is of two-flap structure. The split surface of the cover is provided with bolt holes and is fixed by bolts to form a complete circle. Since the weight of a single flap of the workpiece reaches 400 KG and the operating space is narrow, it is extremely difficult to manually move and install the cover. Using the method of the present invention for assembly, as Figure 1 and Figure 2 shown, the process is as follows:

[0028] 1) Pulley I 20 and pulley II 21 are assembled onto slide rail I 4 of lifting frame 2, and pulley III 22 and pulley IV 23 are assembled onto slide rail II 5 of lifting frame 2;

[0029] 2) According to the span distance between the two lifting points of a single flap of the cover, a connecting plate with a suitable length is selected. Connecting plate I 18 is assembled with pulley I 20 and pulley II 21 and fixed by bolts 17 to form a pulley block;

[0030] 3) Connecting plate II 19 is assembled with pulley III 22 and pulley IV 23 and fixed by bolts 17 to form a pulley block;

[0031] 4) For the two outer circular lifting holes on the left flap 14 of the protective cover, the lifting ring I 10 and the lifting ring II 11 are respectively assembled;

[0032] 5) For the two outer circular lifting holes on the right flap 15 of the protective cover, the lifting ring III 12 and the lifting ring IV 13 are respectively assembled;

[0033] 6) The hook 1 of the crane is connected to the lifting point 3 of the lifting frame 2, and the hook 1 is lifted to make the lifting frame 2 located at a position convenient for hanging the manual hoist;

[0034] 7) The hook I 24 of the manual hoist I 6 is connected to the pulley I 20, the hook II 25 of the manual hoist II 7 is connected to the pulley II 21, the hook III 26 of the manual hoist III 8 is connected to the pulley III 22, and the hook IV 27 of the manual hoist IV 9 is connected to the pulley IV 23;

[0035] 8) Move the crane to displace the lifting frame 2 above the protective cover, and use the hook of the manual hoist I 6 to connect with the lifting ring I 10, the hook of the manual hoist II 7 to connect with the lifting ring II 11, the hook of the manual hoist III 8 to connect with the lifting ring III 12, and the hook of the manual hoist IV 9 to connect with the lifting ring IV 13;

[0036] 9) The hook 1 of the crane is slowly lifted to lift the left flap 14 and the right flap 15 of the protective cover into the air, and by adjusting the distance of the lifting chain of the manual hoist, the split surface I 28 and the split surface II 29 of the protective cover are adjusted to be perpendicular to the ground plane;

[0037] 10) Lift and move the left flap 14 and the right flap 15 of the protective cover above the main shaft 16.

[0038] In this step, through the lifting device, the simultaneous lifting and installation of the two split ring-shaped parts are realized. Compared with the conventional method of separately hoisting single split ring-shaped parts, the working efficiency is greatly improved.

[0039] 11) Through the installer moving the left flap 14 of the protective cover, drive the pulley I 20 and the pulley II 21 to move on the slide rail of the lifting frame 2 to the left side of the main shaft 16;

[0040] 12) Through the installer moving the right flap 15 of the protective cover, drive the pulley III 22 and the pulley IV 23 to move on the slide rail of the lifting frame 2 to the right side of the main shaft 16.

[0041] In this step, by using two groups of pulleys, the two split workpieces can be easily moved and assembled. Compared with the conventional method mainly relying on manpower to move the split workpieces, the labor intensity is greatly reduced.

[0042] 13) Adjust the distance between the left flap 14 and the right flap 15 of the protective cover, and the shortest distance between the split surface I 28 and the split surface II 29 of the protective cover should be greater than the diameter dimension of the main shaft 16;

[0043] 14) After the crane slowly lowers the protective cover to the left and right sides of the main shaft 16, move the left flap 14 and the right flap 15 of the protective cover towards the shaft body of the main shaft 16 respectively until the split surface I 28 is aligned and closely attached to the split surface II 29;

[0044] 15) For the left flap 14 and the right flap 15 of the protective cover, use bolts to perform the butting assembly through the butting holes on the split surface I 28 and the split surface II 29 to form a complete circle;

[0045] 16) Then, through 4 groups of chain hoists, adjust the position of the protective cover after forming a complete circle in the circumferential direction. After meeting the installation requirements, assemble it with the main shaft 16.

[0046] In this step, during the process of forming a complete circle of the split ring part group and the overall assembly with the workpiece, it is always in a stable state under the force of the crane, avoiding the situation of bumping and scratching during the installation process, and ensuring the installation quality of the unit.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A method for assembling split ring-shaped parts of a horizontal hydraulic generator unit Its features include the following steps: 1) Pulley I (20) and Pulley II (21) are assembled onto the slide rail I (4) of the lifting frame (2), and Pulley III (22) and Pulley IV (23) are assembled onto the slide rail II (5) of the lifting frame (2); 2) Connecting plate I (18) is assembled with Pulley I (20) and Pulley II (21), and fixed by bolting with bolt (17); 3) Connecting plate II (19) is assembled with Pulley III (22) and Pulley IV (23), and fixed by bolting with bolt (17); 4) For the two outer - circle lifting holes on the left - hand lobe (14) of the split - ring part, sling ring I (10) and sling ring II (11) are respectively assembled; 5) For the two outer - circle lifting holes on the right - hand lobe (15) of the split - ring part, sling ring III (12) and sling ring IV (13) are respectively assembled; 6) The hook (1) of the crane is connected to the lifting point (3) of the lifting frame (2); 7) The hook I (24) of the manual hoist I (6) is connected to Pulley I (20), the hook II (25) of the manual hoist II (7) is connected to Pulley II (21), the hook III (26) of the manual hoist III (8) is connected to Pulley III (22), and the hook IV (27) of the manual hoist IV (9) is connected to Pulley IV (23); 8) Move the crane to displace the lifting frame (2) above the split - ring part. Connect the hook of the manual hoist I (6) to sling ring I (10), the hook of the manual hoist II (7) to sling ring II (11), the hook of the manual hoist III (8) to sling ring III (12), and the hook of the manual hoist IV (9) to sling ring IV (13); 9) Slowly raise the hook (1) of the crane to lift the left - hand lobe (14) and the right - hand lobe (15) of the split - ring part into the air. By adjusting the distance of the lifting chains of the manual hoists, adjust the split surfaces I (28) and II (29) of the workpiece to be perpendicular to the ground plane; 10) Lift and move the left - hand lobe (14) and the right - hand lobe (15) of the split - ring part above the horizontal - placed workpiece (16); 11) By moving the left - hand lobe (14) of the split - ring part, drive Pulley I (20) and Pulley II (21) to move on the slide rails of the lifting frame (2) to the left side of the workpiece (16); 12) By moving the right - hand lobe (15) of the split - ring part, drive Pulley III (22) and Pulley IV (23) to move on the slide rails of the lifting frame (2) to the right side of the workpiece (16); 13) After the crane slowly lowers the split - ring part to the left and right sides of the workpiece (16), move the left - hand lobe (14) and the right - hand lobe (15) of the split - ring part towards the central workpiece (16) respectively until the split surface I (28) is aligned and closely attached to the split surface II (29); 14) The left - hand lobe (14) and the right - hand lobe (15) of the split - ring part are bolted and assembled at the positions of the split surfaces I (28) and II (29); 15) The integral - circle split - ring part is bolted and assembled with the workpiece (16).

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