Modular adjusting vertical lifting device and method for top cover of hydroelectric generator set

Abstract

A modular adjustable vertical lifting device and method for the top cover of a hydro-generator unit is disclosed. It includes a main beam, side beams, connecting beams, adjusting joints, and lifting straps. The main beam is connected to the side beams at both ends, and the connecting beams are located on both sides of the main beam and connected to the side beams. Four adjusting joints are located at the lower part of the side beams and connected by lifting straps and two sets of pulleys. The spacing between the upper and lower connecting seats of the adjusting joints is adjustable. An assembled structure connects the side beams to the main beam and the connecting beams to the side beams. The adjusting joints and side beams are flexibly connected by lifting straps to form an integral structure. This integral structure is connected to a bridge crane. The lower end of the adjusting joint is connected to the top cover of the generator unit. The top cover is lifted by the bridge crane, and the horizontal balance of the top cover is adjusted by the adjusting joints. The device is easy to disassemble and install, highly efficient, and safe and reliable.

Description

Technical Field

[0001] This invention belongs to the field of installation and maintenance technology of large hydro-generators, and relates to a modular adjustable vertical lifting device for the top cover of a hydro-generator set. Background Technology

[0002] The top cover of a large hydro-turbine generator unit typically weighs around 380 tons and has a diameter of over 13 meters. To accommodate the hoisting of such a massive structure, the top cover of a large hydro-turbine generator unit is designed with dedicated lifting holes to facilitate assembly with its original lifting equipment. These dedicated lifting equipment are quite large. During overhauls of large hydro-turbine generator units, the assembly is difficult and demanding. The existing lifting equipment is bulky, difficult to install and position, and inconvenient to transport, typically requiring at least several days for each assembly.

[0003] Using slings for roof hoisting is currently the most common method. The distance between the roof and the lifting equipment is usually more than 10 meters. However, the process of protecting and adjusting the slings is cumbersome and time-consuming, relying on the lifting skills and experience of special crane operators. This method is technically challenging and has low maintenance efficiency. Furthermore, during the hoisting process, the long slings pose a risk of being cut by sharp metal structural components at the roof hoisting points, resulting in poor hoisting reliability and safety hazards. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a modular adjustment vertical lifting device and method for the top cover of a hydro-generator unit, which is equipped with an auxiliary adjustment device, optimizes the lifting method, solves the risks in the lifting operation, and improves the efficiency and safety of the operation.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a modular adjustable vertical lifting device for the top cover of a hydro-generator unit, which includes a main beam, side beams, connecting beams, adjusting joints and lifting straps; 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 four adjusting joints are located at the lower part of the side beams and connected by lifting straps and two sets of pulleys; the distance between the upper connecting seat and the lower connecting seat of the adjusting joint is adjustable.

[0006] The connections between the main beam and the side beams, as well as between the connecting beams and the side beams, all adopt a quick-assembly connection structure.

[0007] The main beam includes an inverted T-beam, an end plate, and a pin; the two inverted T-beams are symmetrical and parallel to each other, forming a space for accommodating the crane hook between the two inverted T-beams, and the pin passes through the two inverted T-beams, with a column hole through the inverted T-beam located between the two pins.

[0008] The end plate engages with the slot at the step of the inverted T-beam, and two sets of limiting plates are set on the side of the end plate to limit the inverted T-beam. A through hole is provided between each set of limiting plates.

[0009] The side beam has a trapezoidal structure. Connecting plates are installed at both ends of one side of the side beam and are connected to the connecting beam by fasteners. Inclined lugs are installed at the lower part of both ends of the side beam and are connected to pulleys. Support columns are installed on the lower side of the side beam, and the height of the support columns is higher than that of the lugs. Multiple lifting rings are installed on the upper side of the side beam.

[0010] The adjusting joint includes an upper connecting seat, a lower connecting seat, and a connecting piece; both the upper and lower connecting seats are U-shaped open structures, with a pulley at the open end of the upper connecting seat and a connecting pin at the open end of the lower connecting seat, and the closed ends of the upper and lower connecting seats are connected by the connecting piece.

[0011] A limiting groove is provided in the groove of the lower connecting seat; the connecting component is a bolt with an elongated head, and an adjusting nut engages with the bolt; the bolt head is engaged in the limiting groove, and the bolt passes through the lower connecting seat and the upper connecting seat. The distance between the lower connecting seat and the connecting component is adjusted by rotating the adjusting nut.

[0012] The sling is a flexible ring-shaped belt. After being folded twice, each end has four strands, and each pair of strands engages with pulleys on the side beam and the upper connecting seat, respectively.

[0013] The column holes on the two inverted T-beams have one threaded hole and the other through hole; the load-bearing pin passes through the column hole and engages with its thread, and the bridge crane hook is located in the bridge crane hook accommodating space and is connected to the load-bearing pin; the bridge crane hook is a flat plate with two upward-opening U-shaped grooves centered on the connecting column.

[0014] The method of using the modular adjustable vertical lifting device for the top cover of the hydro-generator unit, as described above, includes the following steps:

[0015] S1, Transfer: Transfer the main beam, side beam, connecting beam, adjusting joint, sling, load-bearing pin and bridge crane hook to the work site respectively;

[0016] S2, Assembly: Assemble the main beam, side beam, and connecting beam into a whole; in this step, the pulley is connected to the lug on the side beam.

[0017] S3, Connect, connect the folded sling to the pulley on the side beam and the pulley on the adjusting joint, and at the same time make the sling in a taut state;

[0018] S4, Lifting: First, remove the main hook of the bridge crane and connect the bridge crane hook to the bridge crane; use the slings on the bridge crane to connect with the lifting rings on the side beams and lift upwards until the entire lifting device is suspended in the air; during this step, the bridge crane hook does not move, and the bridge crane slings lift the lifting device.

[0019] S5, hooking: As the lifting device is lifted upward, the accommodating space of the bridge crane hook on the main beam gradually approaches the bridge crane hook. After the bridge crane hook enters the accommodating space of the bridge crane hook, the load-bearing pin is inserted into the column hole and connected to it. Then the connection between the sling and the lifting ring is released, so that the bridge crane hook and the load-bearing pin are hooked.

[0020] S6, hoist the top cover, start the bridge crane, drive it to the top of the unit top cover, then gradually lower the hoisting device, so that the lower connecting seat gradually approaches the hoisting hole of the top cover, and then use the connecting pin to pass through the hoisting hole and connect the lower connecting seat into a whole, and then use the bridge crane to lift the top cover.

[0021] S7, Adjustment: When the top cover tilts during lifting or installation, the level of the top cover can be adjusted by rotating the adjusting nut on the adjusting joint to bring the upper and lower connecting seats closer or further apart.

[0022] The main beneficial effects of this invention are as follows:

[0023] The main beams, side beams, and connecting beams are connected by assembly, allowing them to be transported separately and then reassembled, which facilitates transportation and improves the convenience of operation.

[0024] The pulleys of the side beam and the pulleys of the upper connecting seat are flexibly connected by slings, which makes it easier for the lower connecting seat to connect with the lifting holes on the top cover. This connection method does not involve rubbing or cutting the slings, thus improving the safety of the overall hoisting process.

[0025] The assembly process utilizes rapid transportation and assembly methods, which not only saves transportation and installation time but also improves the utilization of space and site.

[0026] The crane hook is connected to the crane, and then hooked to the load-bearing pin. The two-point centering hooking is used, so there is no need to find a balance point during the process of hooking the lifting device to the crane hook.

[0027] During the lifting process, the level of the unit's top cover can be adjusted simply by rotating the adjusting nut to bring the lower and upper connecting seats closer together or further apart. At the same time, the lifting sling will not rub against the unit's top cover during the lifting process, thus improving the safety of the operation. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] Figure 1 This is a schematic diagram of the structure of the present invention.

[0030] Figure 2 This is a schematic diagram of the main beam structure of the present invention.

[0031] Figure 3 for Figure 2 A top-down view.

[0032] Figure 4 This is a schematic diagram of the inverted T-shaped beam structure of the present invention.

[0033] Figure 5 This is a schematic diagram of the end plate structure of the present invention.

[0034] Figure 6 for Figure 5 Front view diagram.

[0035] Figure 7 This is a schematic diagram of the side beam structure of the present invention.

[0036] Figure 8 for Figure 7 Front view diagram.

[0037] Figure 9 This is a schematic diagram of the connection between the adjusting joint and the sling of the present invention.

[0038] Figure 10 for Figure 9 Front view diagram.

[0039] Figure 11 This is a schematic diagram of the lower connecting seat structure of the present invention.

[0040] Figure 12 This is a schematic diagram of the connector structure of the present invention.

[0041] Figure 13 This is a schematic diagram of the sling of the present invention folded in half.

[0042] Figure 14 This is a schematic diagram of the bridge crane hook structure of the present invention.

[0043] Figure 15 This is a schematic diagram illustrating the usage state of the present invention.

[0044] The markings in the diagram are: Main beam 1; Inverted T-beam 11; End plate 12; Pin 13; Column hole 14; Slot 15; Limiting 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; Limiting groove 45; Lifting strap 5; Pulley 6; Load-bearing pin 7; Bridge crane hook 8. Detailed Implementation

[0045] like Figures 1-15A modular adjustable vertical lifting device for the top cover of a hydro-generator unit includes a main beam 1, side beams 2, connecting beams 3, adjusting joints 4, and lifting straps 5. The main beam 1 is connected to the side beams 2 at both ends. 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 located at the lower part of the side beams 2 and connected by lifting straps 5 and two sets of pulleys 6. The spacing between the upper connecting seat 41 and the lower connecting seat 42 of the adjusting joint 4 is adjustable. An assembled structure connects the side beams 2 to the main beam 1, and the connecting beams 3 to the side beams 2. The adjusting joints 4 and the side beams 2 are flexibly connected by lifting straps 5 to form an integral structure. This integral structure is connected to a bridge crane. The lower end of the adjusting joint 4 is connected to the top cover of the generator unit. The top cover is lifted by the bridge crane, and the horizontal balance of the top cover is adjusted by the adjusting joints 4. The device is easy to disassemble and install, highly efficient, and safe and reliable.

[0046] In the preferred embodiment, the connection between the main beam 1 and the side beam 2, as well as the connection between the connecting beam 3 and the side beam 2, all adopt a quick-assembly connection structure. During manufacturing, due to the large size and weight of the unit's top cover, the main beam 1, side beam 2, and connecting beam 3 are required to be large in size and have good load-bearing capacity. The connection between them is made by assembly, allowing them to be transported separately and then reassembled, which facilitates transportation and improves the convenience of operation.

[0047] In a preferred embodiment, the main beam 1 includes an inverted T-beam 11, an end plate 12, and a pin 13. Two inverted T-beams 11 are symmetrically parallel to each other, forming a space between them to accommodate the crane hook. The pin 13 passes through the two inverted T-beams 11, and a through-hole 14 is provided between the two pins 13. In use, the two inverted T-beams 11 are first connected into a single unit using the two pins 13. A certain distance exists between the two inverted T-beams 11, forming a space to accommodate the crane hook 8, facilitating subsequent accommodation of the crane hook 8.

[0048] 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 connected to the load-bearing pin 7 by the bridge crane hook 8, forming a sunken design, which greatly reduces the distance between the bridge crane and the lifting device, making it easier to transfer the unit between the factory buildings after the top cover is lifted out of the foundation pit.

[0049] In a preferred embodiment, the end plate 12 engages with the slot 15 at the step of the inverted T-beam 11. Two sets of limiting plates 16 are provided on the side of the end plate 12 to limit the inverted T-beam 11, and a through hole 17 is provided between each set of limiting plates 16. In use, the end plate 12 is engaged in the slot 15 of the inverted T-beam 11. The locking opening and the slot 15 on the lower side of the end plate 12 cooperate to limit the two inverted T-beams 11. At the same time, the two sets of limiting plates 16 on the side of the end plate 12 play a limiting role for 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 on the same axis, which facilitates the accurate passage of the subsequent load-bearing pin 7 and makes assembly quick and efficient.

[0050] In a preferred embodiment, the side beam 2 has a trapezoidal structure. Connecting plates 21 are installed at both ends of one side of the side beam 2, engaging with the connecting beam 3 and connected via fasteners. Inclined lugs 22 are installed at the lower parts of both ends of the side beam 2, connecting to pulleys 6. Support columns 23 are installed on the lower side of the side beam 2, with the height of the support columns 23 exceeding that of the lugs 22. Multiple lifting rings 24 are installed on the upper side of the side beam 2. In use, the fasteners pass through the through holes 17 on the limiting plates 16, with the fastening heads positioned between the two limiting plates 16 to restrict radial rotation. The rod of the fastener passes through the limiting plates 16 and the side beam 2. A nut is fitted onto the other end of the side beam 2, and rotating the nut connects the side beam 2 and the main beam 1 into a single unit. This connection process only requires rotating the nut; no other clamping tools are needed to hold the fastening heads, making installation convenient and quick.

[0051] Preferably, the support column 23 provides support, so that the lower parts of the main beam 1 and the side beam 2 are suspended in the air, which facilitates the installation of the pulley 6.

[0052] Preferably, after the entire lifting device is assembled, it is necessary to connect the lifting device to the bridge crane. At this time, the lifting ring 24 is used as the lifting point to raise the whole device, which facilitates the connection between the lifting device and the bridge crane.

[0053] In a preferred embodiment, the adjusting joint 4 includes an upper connecting seat 41, a lower connecting seat 42, and a connecting member 43. Both the upper connecting seat 41 and the lower connecting seat 42 have a U-shaped opening structure. A pulley 6 is provided at the open end of the upper connecting seat 41, and a connecting pin 44 is provided at the open end of the lower connecting seat 42. The closed ends of the upper connecting seat 41 and the lower connecting seat 42 are connected by the connecting member 43. In use, the connection between the upper connecting seat 41 and the lower connecting seat 42 is made movable by the connecting member 43, which facilitates the adjustment of the distance between the upper connecting seat 41 and the lower connecting seat 42, thereby adjusting the levelness of the top cover during lifting or installation.

[0054] In a preferred embodiment, a limiting groove 45 is provided within the groove of the lower connecting seat 42; the connecting member 43 is a bolt with an elongated head, and an adjusting nut engages with the bolt; the bolt head is engaged within the limiting groove 45, and the bolt passes through the lower connecting seat 42 and the upper connecting seat 41. The distance between the lower connecting seat 42 and the connecting member 43 is adjusted by rotating the adjusting nut. During installation, the bolt head of the connecting member 43 is engaged within the limiting groove 45 of the lower connecting seat 42 and cannot rotate. After passing through the lower connecting seat 42 and the upper connecting seat 41, the bolt engages with the adjusting nut. Adjustment is simple and convenient; simply rotating the adjusting nut allows the lower connecting seat 42 and the upper connecting seat 41 to move closer or further apart.

[0055] In a preferred embodiment, the sling 5 is a flexible, annular belt. After being folded twice, each end forms four strands, with each pair of strands engaging with the pulleys 6 on the side beam 2 and the upper connecting seat 41, respectively. In use, the flexible sling 5 is simply folded in half and then fitted onto the pulleys 6 on the side beam 2 and the upper connecting seat 41 to achieve a flexible connection. Because of this flexible connection, the lower connecting seat 42 can more easily connect with the lifting holes on the top cover, and this connection method eliminates the risk of rubbing or cutting the sling, improving safety during the overall lifting process.

[0056] Preferably, since the sling 5 and the pulley 6 are slidably connected, the amount of slippage can be automatically adjusted during the load-bearing process, which can effectively prevent the sling 5 from getting stuck or slipping during the load-bearing process.

[0057] In the preferred embodiment, one of the column holes 14 on the two inverted T-beams 11 is threaded, while the other is a through hole. The load-bearing pin 7 passes through the column hole 14 and engages with its thread. The bridge crane hook 8 is located within the bridge crane hook accommodating space and is hooked to the load-bearing pin 7. The bridge crane hook 8 is a flat plate with two upward-opening U-shaped grooves centered on the connecting column. In use, the bridge crane hook 8 is connected to the bridge crane, and then hooked to the load-bearing pin 7. This hooking connection is not only convenient for installation and disassembly, but also eliminates the need to find a balance point during the entire process of hooking the lifting device and the bridge crane hook 8 due to the two-point centering hooking.

[0058] In a preferred embodiment, the method of using the modular adjustable vertical lifting device for the top cover of the hydro-generator unit, as described above, includes the following steps:

[0059] S1, Transfer: Transfer the main beam 1, side beam 2, connecting beam 3, adjusting joint 4, sling 5, load-bearing pin 7 and bridge crane hook 8 to the work site respectively;

[0060] S2, Assembly: Assemble the main beam 1, side beam 2, and connecting beam 3 into a whole; in this step, the pulley 6 is connected to the lug 22 on the side beam 2;

[0061] S3, Connect, connect the folded sling 5 to the pulley 6 on the side beam 2 and the pulley 6 on the adjusting joint 4, and at the same time make the sling 5 taut;

[0062] S4, Lifting: First, remove the main hook of the bridge crane and connect the bridge crane hook 8 to the bridge crane; use the slings on the bridge crane to connect with the lifting rings 24 on the side beam 2, and lift upwards 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 slings lift the lifting device.

[0063] S5, hooking, as the lifting device is lifted upward, the bridge crane hook accommodating space on the main beam 1 gradually approaches the bridge crane hook 8. After the bridge crane hook 8 enters the bridge crane hook accommodating space, the load-bearing pin 7 is inserted into the column hole 14 and connected to it. Then the connection between the sling and the lifting ring 24 is released, so that the bridge crane hook 8 and the load-bearing pin 7 are hooked.

[0064] S6, hoist the top cover, start the bridge crane, drive it to the top of the unit top cover, then gradually lower the hoisting device, so that the lower connecting seat 42 gradually approaches the hoisting hole of the top cover, and then use the connecting pin 44 to pass through the hoisting hole and connect the lower connecting seat 42 into a whole, and then use the bridge crane to lift the top cover.

[0065] S7, Adjustment: When the top cover tilts during lifting or installation, the level of the top cover can be adjusted by rotating the adjusting nut on the adjusting joint 4 to bring the upper connecting seat 41 and the lower connecting seat 42 closer or further apart.

[0066] The above method uses a rapid transfer and assembly process, which not only saves transfer and installation time and improves the utilization of space and site, but also eliminates the need to find a balance point when the lifting device is connected to the bridge crane hook 8. During the lifting process, the level of the unit's top cover can be adjusted simply by rotating the adjusting nut. At the same time, the lifting strap will not rub against the unit's top cover during the lifting process, thus improving the safety of the operation.

[0067] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The embodiments and features described in these embodiments can be arbitrarily combined without conflict. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A modular adjustable vertical lifting device for the top cover of a hydro-generator unit, characterized in that: It includes a main beam (1), side beams (2), connecting beams (3), adjusting joints (4), and slings (5); the main beam (1) is connected to the side beams (2) at both ends, the connecting beams (3) are located on both sides of the main beam (1) and connected to the side beams (2), and the four adjusting joints (4) are located at the lower part of the side beams (2) and connected by slings (5) and two sets of pulleys (6); the distance between the upper connecting seat (41) and the lower connecting seat (42) of the adjusting joint (4) is adjustable; 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 symmetrical and parallel to each other, forming a space for accommodating the crane hook between the two inverted T-beams (11), and the pin (13) passes through the two inverted T-beams (11), with a column hole (14) through the inverted T-beam (11) located between the two pins (13). The end plate (12) of the main beam (1) engages with the slot (15) at the step of the inverted T-beam (11). Two sets of limiting plates (16) are set on the side of the end plate (12) to limit the inverted T-beam (11). A through hole (17) is set between each set of limiting plates (16). The sling (5) is a flexible ring-shaped belt. After being folded twice, four strands are formed at each end. Each pair of strands cooperates with the pulley (6) on the side beam (2) and the pulley (6) on the upper connecting seat (41).

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

3. The modular adjustable vertical lifting device for the top cover of a hydro-generator unit according to claim 1, 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 fastened to the connecting beam (3) and connected by fasteners. Inclined ear seats (22) are provided at the lower part of both ends of the side beam (2) and are connected to pulleys (6). Support columns (23) are provided on the lower side of the side beam (2), and the height of the support columns (23) is higher than that of the ear seats (22). Multiple lifting rings (24) are provided on the upper side of the side beam (2).

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

5. The modular adjustable vertical lifting device for the top cover of a hydro-generator unit according to claim 1, characterized in that: The lower connecting seat (42) has a limiting groove (45) in its groove; the connecting piece (43) is a bolt with a long waist-shaped head, and the adjusting nut cooperates with the bolt; the bolt head is located in the limiting groove (45) and engaged, and the bolt passes through the lower connecting seat (42) and the upper connecting seat (41). The distance between the lower connecting seat (42) and the connecting piece (43) is adjusted by rotating the adjusting nut.

6. The modular adjustable vertical lifting device for the top cover of a hydro-generator unit according to claim 1, characterized in that: The two inverted T-beams (11) have column holes (14), one of which is threaded and the other is through. The load-bearing pin (7) passes through the column hole (14) and engages with its 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 with two upward-opening U-shaped grooves centered on the connecting column.

7. The method of using the modular adjustable vertical lifting device for the top cover of a hydro-generator unit according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1, transfer, transfer the main beam (1), side beam (2), connecting beam (3), adjusting joint (4), sling (5), load-bearing pin (7) and bridge crane hook (8) to the work site respectively; S2, Assembly: Assemble the main beam (1), side beam (2) and connecting beam (3) into a whole; in this step, the pulley (6) is connected to the lug (22) on the side beam (2); S3, connect, connect the folded sling (5) to the pulley (6) on the side beam (2) and the pulley (6) on the adjusting joint (4), and at the same time make the sling (5) form a tensioned state; S4, Lifting: First, remove the main hook of the bridge crane and connect the bridge crane hook (8) to the bridge crane; use the slings on the bridge crane to connect with the lifting rings (24) on the side beam (2) and lift upwards 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 slings lift the lifting device. S5, hooking, as the lifting device is lifted upward, the bridge crane hook accommodating space on the main beam (1) gradually approaches the bridge crane hook (8). When the bridge crane hook (8) enters the bridge crane hook accommodating space, the load-bearing pin (7) is inserted into the column hole (14) and connected to it. Then the connection between the sling and the lifting ring (24) is released, so that the bridge crane hook (8) and the load-bearing pin (7) are hooked together. S6, hoist the top cover, start the bridge crane, drive it to the top of the unit, and then gradually lower the hoisting device so that the lower connecting seat (42) gradually approaches the hoisting hole of the top cover. Then use the connecting pin (44) to pass through the hoisting hole and the lower connecting seat (42) to connect them into a whole. After that, use the bridge crane to lift the top cover. S7, Adjustment: When the top cover tilts during lifting or installation, the level of the top cover can be adjusted by rotating the adjusting nut on the adjusting joint (4) to bring the upper connecting seat (41) and the lower connecting seat (42) closer or further apart.

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