Modularized adjustment vertical lifting device and method for top cover of water-turbine generator set

Abstract

The invention discloses a modularized adjusting vertical lifting device and method for a top cover of a water-turbine generator set. The modularized adjusting vertical lifting device comprises a main beam, side beams, connecting beams, adjusting joints and lifting belts, the two ends of the main beam are connected with the side beams, the connecting beams are located on the two sides of the main beam and connected with the side beams, and the four adjusting connectors are located on the lower portions of the side beams and connected with the two pulleys through hanging belts. And the distance between the upper connecting seat and the lower connecting seat of the adjusting joint is adjustable. The side beams are connected with the main beam, the connecting beams are connected with the side beams, the adjusting connectors and the side beams are flexibly connected through the hanging belts to form an integral structure, the integral structure is connected with the bridge crane, the lower ends of the adjusting connectors are connected with the top cover of the generator set, the top cover is lifted through the bridge crane, and the horizontal balance degree of the top cover is adjusted through the adjusting connectors. Disassembly and assembly are convenient, efficiency is high, and safety and reliability are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of installation and maintenance of large-scale hydro-generators, and relates to a modular adjustment vertical lifting device for a top cover of a hydro-generator set. Background Art

[0002] The top cover of a large hydro-turbine generator set generally weighs about 380 tons and is more than 13 meters in diameter. In order to meet the requirements of hoisting the top cover of such a huge structure, the top cover of a large hydro-turbine generator set is designed with special lifting holes to realize assembly with its original matching lifting equipment. The size of the special lifting equipment is relatively large. When a large hydro-turbine generator set is overhauled, the assembly is difficult and stressful. The original hoisting equipment is large in size, difficult to install, and inconvenient to transport. It usually takes at least several days to complete the one-time operation.

[0003] The top cover is hoisted with slings, which is also the currently used top cover hoisting method. The distance between the top cover and the hoisting equipment is usually more than 10 meters, but the protection, installation and adjustment of the rigging are cumbersome and time-consuming, relying on the lifting technology and work experience of special lifting operators to make judgments. There are problems of high technical difficulty and low maintenance efficiency. In addition, during the hoisting process, due to the long slings, there is a risk of being cut by the sharp edges of the metal structural components at the top cover lifting points. The hoisting reliability is poor and there are safety hazards. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a modular adjustable vertical lifting device and method for the top cover of a hydro-turbine generator set, configure an auxiliary adjustment device, optimize the lifting method, solve the risks existing in the lifting operation, and improve the operation efficiency and safety.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a modular adjustable vertical lifting device for the top cover of a hydro-turbine generator set, which includes a main beam, a side beam, a connecting beam, an adjusting joint and a sling; the two ends of the main beam are connected to the side beams, the connecting beams are located on both sides of the main beam and connected to the side beams, and the four adjusting joints are respectively located at the lower part of the side beams and are connected by slings and two sets of pulleys; the spacing between the upper connecting seat and the lower connecting seat of the adjusting joint is adjustable.

[0006] The connection between the main beam and the side beam and between the connecting beam and the side beam all adopts a quick assembly connection structure.

[0007] The main beam includes an inverted T-beam, an end plate and a pin shaft; the two inverted T-beams are symmetrically parallel to each other, forming a bridge crane hook accommodating space between the two inverted T-beams, the pin shaft passes through the two inverted T-beams, and a column hole penetrating the inverted T-beam is set between the two pin shafts.

[0008] The end plate is engaged with the slot at the step of the inverted T-beam, and two groups of limiting plates are arranged on the side of the end plate to limit the inverted T-beam, and through holes are arranged between each group of limiting plates.

[0009] The side beam is a trapezoidal structure, with connecting plates at both ends of one side of the side beam being clamped with the connecting beam and connected by fasteners; ears with inclined structures are arranged at the lower part of both ends of the side beam and connected with the pulley; a support column is arranged on the lower side of the side beam, and the height of the support column is higher than the ear seat; and a plurality of lifting rings are arranged on the upper side of the side beam.

[0010] The adjusting joint comprises an upper connecting seat, a lower connecting seat and a connecting piece; the upper connecting seat and the lower connecting seat are both U-shaped opening structures, a pulley is arranged at the open end of the upper connecting seat, a connecting pin is arranged at the open end of the lower connecting seat, and the closed ends of the upper connecting seat and the lower connecting seat pass through the connecting piece.

[0011] A limiting groove is arranged in the groove body of the lower connecting seat; the connecting piece is a bolt, the bolt head of which is a long waist-shaped structure, and the adjusting nut cooperates with the bolt; the bolt head is engaged in the limiting groove, the bolt passes through the lower connecting seat and the upper connecting seat, and the adjusting nut is rotated to adjust the distance between the lower connecting seat and the connecting piece.

[0012] The sling is an annular belt with a flexible structure, which is folded twice to form four strands at each end, and each two strands are respectively matched with the pulley on the side beam and the pulley on the upper connecting seat.

[0013] The column holes on the two inverted T-beams are threaded on one side and through holes on the other side; the load-bearing pin passes through the column hole and cooperates with the thread, and the bridge crane hook is located in the bridge crane hook accommodating space and is hooked with the load-bearing pin; the bridge crane hook is a flat plate with two upwardly open U-shaped grooves centered on the connecting column.

[0014] The method for using the modular adjustable vertical lifting device for the top cover of the hydro-generator set as described above comprises the following steps: S1, transportation, transporting the main beam, side beam, connecting beam, adjusting joint, sling, load-bearing pin and bridge crane hook to the operation site; S2, assembling, respectively assembling the main beam, the side beam and the connecting beam into a whole; in this step, the pulley is connected to the ear seat on the side beam; S3, connecting, connecting the folded sling to the pulley on the side beam and the pulley on the adjustment joint, and making the sling in a stretched state; S4, lifting, first remove the main hook of the bridge crane, connect the bridge crane hook with the bridge crane; use the sling on the bridge crane to connect with the lifting ring on the side beam, and lift it upward until the entire lifting device is suspended in the air; in this step, the bridge crane hook does not move, and the bridge crane sling lifts the lifting device; S5, hooking, when the lifting device is lifted upward, the bridge crane hook accommodation space on the main beam gradually approaches the bridge crane hook. When the bridge crane hook enters the bridge crane hook accommodation space, the load-bearing pin is inserted into the column hole to connect with it, and then the connection between the sling and the lifting ring is released, so that the bridge crane hook is hooked with the load-bearing pin; S6, hoist the top cover, start the bridge crane, make it move to the upper part of the unit top cover, then gradually lower the lifting device, make the lower connecting seat gradually approach the lifting hole of the top cover, then use the connecting pin to pass through the lifting hole and connect the lower connecting seat into a whole, and then use the bridge crane to lift the top cover; S7, adjustment. When the top cover is tilted during lifting or installation, the top cover can be adjusted to be level by rotating the adjusting nut on the adjusting joint to move the upper connecting seat and the lower connecting seat closer to or farther away from each other.

[0015] The main beneficial effects of the present invention are: The main beam, side beam and connecting beam are connected to each other by assembly and can be transported separately and then reassembled, which is convenient for transportation and improves convenience during operation.

[0016] The pulleys of the side beam and the pulleys of the upper connecting seat are flexibly connected by a sling, so that the lower connecting seat can be more conveniently connected to the lifting hole on the top cover. This connection method does not cause the sling to be scratched, thereby improving the safety of the overall lifting process.

[0017] The assembly is carried out in a fast transportation and assembly manner, which not only saves transportation and installation time, but also improves the utilization rate of space and site.

[0018] The bridge crane hook is connected to the bridge crane, and then hooked with the load-bearing pin through the bridge crane hook, using two-point centering hooking. During the process of hooking the lifting device with the bridge crane hook, there is no need to find a balance point.

[0019] During the lifting process, the horizontality of the unit top cover can be adjusted by rotating the adjusting nut to make the lower connecting seat and the upper connecting seat closer to or farther away from each other. At the same time, during the lifting process, the sling will not be scratched by the unit top cover, which improves the safety during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 It is a schematic diagram of the main beam structure of the present invention.

[0023] Figure 3 for Figure 2 Schematic top view of .

[0024] Figure 4 It is a schematic diagram of the inverted T-beam structure of the present invention.

[0025] Figure 5 It is a schematic diagram of the end plate structure of the present invention.

[0026] Figure 6 for Figure 5 Schematic diagram of the main view.

[0027] Figure 7 It is a schematic diagram of the side beam structure of the present invention.

[0028] Figure 8 for Figure 7 Schematic diagram of the main view.

[0029] Fig. 9 It is a schematic diagram of the connection between the adjusting joint and the sling of the present invention.

[0030] Fig.10 for Fig. 9 Schematic diagram of the main view.

[0031] Fig.11 It is a schematic diagram of the structure of the lower connecting seat of the present invention.

[0032] Fig.12 It is a schematic diagram of the connecting piece structure of the present invention.

[0033] Fig.13 It is a schematic diagram of the sling of the present invention being folded in half.

[0034] Fig.14 It is a schematic diagram of the bridge crane hook structure of the present invention.

[0035] Fig.15 It is a schematic diagram of the use state of the present invention.

[0036] Markings in the figure: main beam 1; inverted T-beam 11; end plate 12; pin shaft 13; column hole 14; slot 15; limit plate 16; through hole 17; side beam 2; connecting plate 21; ear seat 22; support column 23; lifting ring 24; connecting beam 3; adjusting joint 4; upper connecting seat 41; lower connecting seat 42; connecting piece 43; connecting pin 44; limit slot 45; sling 5; pulley 6; load-bearing pin 7; bridge crane hook 8. DETAILED DESCRIPTION

[0037] like Figure 1 to Figure 15In the invention, a modular adjustable vertical lifting device for the top cover of a hydro-turbine generator set is disclosed, which comprises a main beam 1, a side beam 2, a connecting beam 3, an adjusting joint 4 and a sling 5; the two ends of the main beam 1 are connected to the side beams 2, the connecting beam 3 is located on both sides of the main beam 1 and connected to the side beams 2, and four adjusting joints 4 are respectively located at the lower part of the side beams 2 and connected through slings 5 ​​and two groups of pulleys 6; the spacing between the upper connecting seat 41 and the lower connecting seat 42 of the adjusting joint 4 is adjustable. The side beam 2 is connected to the main beam 1 and the connecting beam 3 is connected to the side beam 2 by an assembled structure, and the adjusting joint 4 and the side beam 2 are flexibly connected by the sling 5 to form an integral structure, which is connected to the bridge machine, and the lower end of the adjusting joint 4 is connected to the top cover of the generator set, and the top cover is lifted by the bridge machine, and the horizontal balance of the top cover is adjusted by the adjusting joint 4, which is convenient to disassemble and install, with high efficiency, safety and reliability.

[0038] In the preferred solution, the main beam 1 and the side beam 2 and the connection beam 3 and the side beam 2 are all connected by a quick assembly connection structure. During production, since the unit top cover is large and heavy, the main beam 1, the side beam 2 and the connection beam 3 are also required to be large in size and have good load-bearing performance. They are connected by assembly and can be transported separately and then reassembled, which is convenient for transportation and improves convenience during operation.

[0039] In a preferred solution, the main beam 1 includes an inverted T-beam 11, an end plate 12 and a pin 13; the two inverted T-beams 11 are symmetrically parallel to each other, and a bridge crane hook accommodating space is formed between the two inverted T-beams 11. The pin 13 passes through the two inverted T-beams 11, and a column hole 14 passing through the inverted T-beams 11 is provided between the two pins 13. When in use, the two inverted T-beams 11 are first connected into a whole by the two pins 13, and a certain distance is provided between the two inverted T-beams 11 to form a bridge crane hook accommodating space, which is convenient for accommodating the bridge crane hook 8 later.

[0040] Preferably, since the column hole 14 is located on the main beam 1, the load-bearing pin 7 passes through the column hole 14 and is then hooked with the load-bearing pin 7 through the bridge crane hook 8, forming a sunken design, which greatly reduces the distance between the bridge crane and the hoisting device, making it easy to transport the unit top cover between the factory buildings after it is lifted out of the foundation pit.

[0041] In a preferred solution, the end plate 12 is engaged with the slot 15 at the step of the inverted T-beam 11, and two groups of limiting plates 16 are arranged on the side of the end plate 12 to limit the inverted T-beam 11, and a through hole 17 is arranged between each group of limiting plates 16. When in use, the end plate 12 is engaged in the slot 15 of the inverted T-beam 11, and the slot 15 and the slot 15 on the lower side of the end plate 12 cooperate to limit the two inverted T-beams 11, and at the same time, the two groups of limiting plates 16 on the side of the end plate 12 play a role in limiting the two inverted T-beams 11, thereby accurately ensuring the spacing between the two inverted T-beams 11, and ensuring that the column holes 14 on the two inverted T-beams 11 are located on the same axis, which is convenient for the subsequent accurate passage of the load-bearing pin 7, and the assembly is fast and efficient.

[0042] In the preferred solution, the side beam 2 is a trapezoidal structure, and connecting plates 21 are provided at both ends of one side of the side beam 2 to engage with the connecting beam 3 and be connected by fasteners; ears 22 of inclined structures are provided at the lower parts of both ends of the side beam 2 to be connected with the pulley 6; a support column 23 is provided on the lower side of the side beam 2, and the height of the support column 23 is higher than the ear seat 22; and a plurality of lifting rings 24 are provided on the upper side of the side beam 2. When in use, the fastener passes through the through hole 17 on the limit plate 16, and the fastening head is located between the two limit plates 16 to limit radial rotation. The rod body of the fastener passes through the limit plate 16 and the side beam 2, and a nut is put on the other end of the side beam 2. The nut is rotated to connect the side beam 2 and the main beam 1 into one. During the connection process, only the nut needs to be rotated, and no other clamping tools are needed to clamp the fastening head, so the installation is convenient and quick.

[0043] Preferably, the support column 23 plays a supporting role, so that the lower part of the main beam 1 and the side beam 2 is in a suspended state, which is convenient for installing the pulley 6.

[0044] Preferably, after the entire lifting device is assembled, it is still necessary to connect the lifting device to the bridge crane. At this time, the lifting ring 24 is used as the lifting point to make it rise as a whole, which is convenient for connecting the lifting device to the bridge crane.

[0045] In a preferred solution, the adjustment joint 4 includes an upper connection seat 41, a lower connection seat 42 and a connecting piece 43; the upper connection seat 41 and the lower connection seat 42 are both U-shaped opening structures, a pulley 6 is provided at the open end of the upper connection seat 41, a connecting pin 44 is provided at the open end of the lower connection seat 42, and the closed ends of the upper connection seat 41 and the lower connection seat 42 pass through the connecting piece 43. When in use, the connection between the upper connection seat 41 and the lower connection seat 42 is movably connected by the connecting piece 43, so as to facilitate the adjustment of the distance between the upper connection seat 41 and the lower connection seat 42, thereby adjusting the horizontality of the top cover during lifting or installation.

[0046] In the preferred solution, a limiting groove 45 is provided in the groove body of the lower connecting seat 42; the connecting member 43 is a bolt, the bolt head of which is a long waist-shaped structure, and the adjusting nut cooperates with the bolt; the bolt head is located in the limiting groove 45 and engaged, the bolt passes through the lower connecting seat 42 and the upper connecting seat 41, and the adjusting nut is rotated to adjust the spacing between the lower connecting seat 42 and the connecting member 43. During installation, the bolt head of the connecting member 43 is engaged in the limiting groove 45 of the lower connecting seat 42 and cannot rotate, and the bolt passes through the lower connecting seat 42 and the upper connecting seat 41 and cooperates with the adjusting nut, and the lower connecting seat 42 and the upper connecting seat 41 can be moved closer to or farther from each other by rotating the adjusting nut, and the adjustment is simple and convenient.

[0047] In the preferred solution, the sling 5 is an annular belt of a flexible structure, and after being folded twice, each end forms four strands, and each two strands respectively cooperate with the pulley 6 on the side beam 2 and the pulley 6 on the upper connecting seat 41. When in use, it is only necessary to fold the flexible sling 5 in half and respectively put it on the pulley 6 of the side beam 2 and the pulley 6 of the upper connecting seat 41 to achieve a flexible connection between the two; because a flexible connection is adopted here, the lower connecting seat 42 can be more conveniently connected with the lifting hole on the top cover, and this connection method does not cause the sling to be scratched, thereby improving the safety of the overall lifting process.

[0048] Preferably, since the sling 5 is connected to the pulley 6 in a sliding manner, the amount of slippage can be automatically adjusted during the load-bearing process, which can effectively prevent the sling 5 from getting unsteady and slipping during the force-bearing process.

[0049] In the preferred solution, the column holes 14 on the two inverted T-shaped beams 11 are threaded on one side and through-holes on the other side; the load-bearing pin 7 passes through the column hole 14 and cooperates with the thread thereof, and the bridge crane hook 8 is located in the bridge crane hook accommodation space and hooked with the load-bearing pin 7; the bridge crane hook 8 is a flat plate, and two U-shaped grooves opening upward are provided with the connecting column as the center. When in use, the bridge crane hook 8 is connected to the bridge crane, and then hooked with the load-bearing pin 7 through the bridge crane hook 8. This hooking connection is not only convenient for installation and disassembly, but also because of the two-point centering hooking, there is no need to find a balance point during the entire process of the lifting device and the bridge crane hook 8 being hooked.

[0050] In a preferred solution, the method for using the modular adjustable vertical lifting device for the top cover of a hydro-generator set as described above comprises the following steps: S1, transporting, respectively transporting the main beam 1, the side beam 2, the connecting beam 3, the adjusting joint 4, the lifting strap 5, the bearing pin 7 and the bridge crane hook 8 to the operation site; S2, assembling, respectively assembling the main beam 1, the side beam 2 and the connecting beam 3 into a whole; in this step, the pulley 6 is connected to the ear seat 22 on the side beam 2; S3, connecting, connecting the folded sling 5 to the pulley 6 on the side beam 2 and the pulley 6 on the adjustment joint 4, and making the sling 5 in a stretched state; S4, lifting, first remove the main hook of the bridge crane, connect the bridge crane hook 8 with the bridge crane; use the sling on the bridge crane to connect with the ring 24 on the side beam 2, and lift it upward until the whole lifting device is suspended in the air; in this step, the bridge crane hook 8 does not move, and the bridge crane sling lifts the lifting device; S5, hooking, when the lifting device is lifted upward, the bridge crane hook accommodation space on the main beam 1 gradually approaches the bridge crane hook 8. When the bridge crane hook 8 enters the bridge crane hook accommodation space, the load-bearing pin 7 is inserted into the column hole 14 to connect with it, and then the connection between the sling and the lifting ring 24 is released, so that the bridge crane hook 8 is hooked with the load-bearing pin 7; S6, hoist the top cover, start the bridge crane, make it move to the upper part of the unit top cover, then gradually lower the lifting device, make the lower connecting seat 42 gradually approach the lifting hole of the top cover, then use the connecting pin 44 to pass through the lifting hole and connect the lower connecting seat 42 into a whole, and then use the bridge crane to lift the top cover; S7, adjustment, when the top cover is tilted during lifting or installation, the top cover is adjusted to be level by rotating the adjusting nut on the adjusting joint 4 to move the upper connecting seat 41 and the lower connecting seat 42 closer to or farther from each other.

[0051] During the above method, a rapid transportation and assembly method is adopted for assembly, which not only saves transportation and installation time, but also improves the utilization rate of space and site. In the process of connecting the lifting device with the bridge crane hook 8, there is no need to find a balance point. During the lifting process, only the adjusting nut needs to be rotated to adjust the horizontality of the unit top cover. At the same time, during the lifting process, the sling will not rub against the unit top cover, thereby improving the safety during operation.

[0052] The above-mentioned embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A modular adjustable vertical lifting device for the top cover of a hydro-generator set, characterized by: It comprises a main beam (1), a side beam (2), a connecting beam (3), an adjusting joint (4) and a sling (5); the two ends of the main beam (1) are connected to the side beams (2); the connecting beams (3) are located on both sides of the main beam (1) and connected to the side beams (2); four adjusting joints (4) are respectively located at the lower part of the side beams (2) and are connected via slings (5) and two sets of pulleys (6); and the spacing between the upper connecting seat (41) and the lower connecting seat (42) of the adjusting joints (4) is adjustable.

2. The modular adjustable vertical lifting device for the top cover of a hydro-generator set according to claim 1 is characterized in that: The connection between the main beam (1) and the side beam (2) and between the connecting beam (3) and the side beam (2) all adopts a quick assembly connection structure.

3. The modular adjustable vertical lifting device for the top cover of a hydro-generator set according to claim 1 is characterized in that: The main beam (1) comprises an inverted T-shaped beam (11), an end plate (12) and a pin shaft (13); the two inverted T-shaped beams (11) are symmetrical and parallel to each other, a bridge crane hook accommodating space is formed between the two inverted T-shaped beams (11), the pin shaft (13) passes through the two inverted T-shaped beams (11), and a column hole (14) penetrating the inverted T-shaped beams (11) is provided between the two pin shafts (13).

4. The modular adjustable vertical lifting device for the top cover of a hydro-generator set according to claim 3 is characterized in that: The end plate (12) is engaged with a slot (15) at a step of the inverted T-shaped beam (11), two groups of limiting plates (16) are arranged on the side of the end plate (12) to limit the inverted T-shaped beam (11), and through holes (17) are arranged between each group of limiting plates (16).

5. The modular adjustable vertical lifting device for the top cover of a hydro-generator set according to claim 1 is characterized in that: The side beam (2) is a trapezoidal structure. Connecting plates (21) are provided at both ends of one side of the side beam (2) and are engaged with the connecting beam (3) and connected via fasteners. Ear seats (22) of an inclined structure are provided at the lower part of both ends of the side beam (2) and are connected to the pulley (6). A support column (23) is provided on the lower side of the side beam (2), and the height of the support column (23) is higher than the ear seat (22). A plurality of lifting rings (24) are provided on the upper side of the side beam (2).

6. The modular adjustable vertical lifting device for the top cover of a hydro-generator set according to claim 1 is characterized in that: The adjusting joint (4) comprises an upper connecting seat (41), a lower connecting seat (42) and a connecting piece (43); the upper connecting seat (41) and the lower connecting seat (42) are both U-shaped opening structures, a pulley (6) is arranged at the open end of the upper connecting seat (41), a connecting pin (44) is arranged at the open end of the lower connecting seat (42), and the closed ends of the upper connecting seat (41) and the lower connecting seat (42) are connected through the connecting piece (43).

7. The modular adjustable vertical lifting device for the top cover of a hydro-generator set according to claim 1 is characterized in that: A limiting groove (45) is arranged in the groove body of the lower connecting seat (42); the connecting piece (43) is a bolt, the bolt head of which is a long waist-shaped structure, and the adjusting nut cooperates with the bolt; the bolt head is located in the limiting groove (45) and is engaged, the bolt passes through the lower connecting seat (42) and the upper connecting seat (41), and the adjusting nut is rotated to adjust the distance between the lower connecting seat (42) and the connecting piece (43).

8. The modular adjustable vertical lifting device for the top cover of a hydro-generator set according to claim 1 is characterized in that: The sling (5) is an annular belt with a flexible structure, which is folded twice to form four strands at each end, and each two strands are respectively matched with the pulley (6) on the side beam (2) and the pulley (6) on the upper connecting seat (41).

9. The modular adjustable vertical lifting device for the top cover of a hydro-generator set according to claim 1 is characterized in that: The column holes (14) on the two inverted T-shaped beams (11) are threaded on one side and through-holes on the other side. The load-bearing pin (7) passes through the column hole (14) and cooperates with the thread. The bridge crane hook (8) is located in the bridge crane hook accommodating space and is connected to the load-bearing pin (7). The bridge crane hook (8) is a flat plate and is provided with two U-shaped grooves opening upwards with the connecting column as the center.

10. The method for using the modular adjustable vertical lifting device for the top cover of a hydro-generator set according to any one of claims 1 to 9, characterized in that: The steps include: S1, transporting, respectively transporting the main beam (1), the side beam (2), the connecting beam (3), the adjusting joint (4), the lifting strap (5), the bearing pin (7) and the bridge crane hook (8) to the operation site; S2, assembling, respectively assembling the main beam (1), the side beam (2) and the connecting beam (3) into a whole; in this step, the pulley (6) is connected to the ear seat (22) on the side beam (2); S3, connecting, connecting the folded sling (5) to the pulley (6) on the side beam (2) and the pulley (6) on the adjustment joint (4), and at the same time making the sling (5) form a stretched state; S4, lifting, first remove the main hook of the bridge crane, connect the bridge crane hook (8) to the bridge crane; use the sling on the bridge crane to connect with the lifting ring (24) on the side beam (2), and lift it upward until the entire lifting device is suspended in the air; in this step, the bridge crane hook (8) does not move, and the bridge crane sling lifts the lifting device; S5, hooking, when the lifting device is lifted upward, the crane hook accommodation space on the main beam (1) gradually approaches the crane hook (8), and when the crane hook (8) enters the crane hook accommodation space, the load-bearing pin (7) is inserted into the column hole (14) to connect with it, and then the connection between the sling and the lifting ring (24) is released, so that the crane hook (8) is hooked with the load-bearing pin (7); S6, hoisting the top cover, starting the bridge crane, making it move to the upper part of the unit top cover, then gradually lowering the lifting device, making the lower connecting seat (42) gradually approach the lifting hole of the top cover, and then using the connecting pin (44) to pass through the lifting hole and connect the lower connecting seat (42) into a whole, and then using the bridge crane to lift the top cover; S7, adjustment, when the top cover is tilted during lifting or installation, the top cover is adjusted to be level by rotating the adjustment nut on the adjustment joint (4) to move the upper connecting seat (41) and the lower connecting seat (42) closer to or farther away from each other.

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