A top cover hoisting device for a hydrogenerator

Abstract

The present invention discloses a hoisting device for the top cover of a hydrogenerator, which relates to the technical field of hoisting the top cover of a hydrogenerator; it includes a first lifting seat, a top lifting ear is arranged at the top of the first lifting seat, and the top lifting ear is connected to a hoisting device; a main lifting tool for hoisting the top cover of the generator is arranged at the bottom of the first lifting seat, and a second lifting seat is arranged outside the first lifting seat; this solution is mainly aimed at the top cover of the generator with grooves arranged on the side, and an auxiliary fixing mechanism is arranged outside the top cover of the generator. By setting the auxiliary fixing mechanism, during hoisting, after connecting the main lifting tool, each first insertion block can be installed in the groove of the top cover of the generator, so that they are evenly distributed in a circumferential manner, the fastening chain is passed through each side bracket and then tightened, and fixed by a locking component. The auxiliary lifting tool is connected to the second lifting seat and the side bracket. During hoisting, the auxiliary fixing mechanism can be used to assist in hoisting, improving the weighing effect and ensuring the stability of the structure.

Description

Technical Field

[0001] The invention relates to the technical field of water turbine generator top cover hoisting, in particular to a water turbine generator top cover hoisting device. Background Art

[0002] During the erection of a large hydro-turbine generator, the weight of its top cover is relatively large, and the installation of the top cover usually requires a hoisting installation method. For example, the Chinese patent application number CN201920331134.X discloses a hoisting device for the top cover of a hydro-turbine generator set, including a hoisting head, a hoisting connection hole is provided above the hoisting head, and installation holes are provided on both sides of the hoisting connection hole. A hoisting rod connection hole is provided at the lower end of the hoisting head, and a hoisting device is provided on the hoisting rod connection hole. The hoisting device is a hoisting rod device or a hook device. The hoisting rod device is used to lift large objects, and the hook device lifts small objects.

[0003] The above-mentioned traditional lifting method is to lift by a lifting rod device, which can meet certain operation requirements, but the stability is insufficient and needs to be improved. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a hydraulic generator top cover hoisting device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A device for hoisting a top cover of a hydro-turbine generator comprises a first hanger, a top lifting lug is arranged on the top of the first hanger, and the top lifting lug is connected to a hoisting device; a main hoisting device for hoisting the top cover of the generator is arranged at the bottom of the first hanger, and a second hanger is arranged outside the first hanger; this scheme is mainly aimed at a generator top cover with a groove arranged on the side, and an auxiliary fixing mechanism is arranged outside the generator top cover, and the auxiliary fixing mechanism comprises:

[0007] A first plug-in block, the first plug-in block is adapted to a groove on the outer circumference of the generator top cover;

[0008] A side bracket, the side bracket is fixed to the outer wall of one end of the first plug-in block away from the generator top cover;

[0009] A fastening chain, wherein the inner side of the side bracket is provided with a through hole for the fastening chain to pass through, and the fastening chain is used to connect the side brackets in series and tighten them, thereby restricting each first plug block in the groove of the generator top cover;

[0010] A locking assembly, the locking assembly is used to fix the tightened fastening chain;

[0011] Auxiliary sling, which is used to connect the second sling and the side bracket.

[0012] As a preferred embodiment of the present invention: The locking assembly includes:

[0013] A second insertion block, which is adapted to the groove;

[0014] A locking frame, on which an adjusting bolt is connected by a thread, and one end of the adjusting bolt is rotatably installed on the inner wall of the second insertion block;

[0015] Insertion rods, both insertion rods are fixed on the outer wall of the top of the locking frame. After passing through the link of the fastening chain, baffles are detachably installed on the insertion rods.

[0016] As a preferred embodiment of the present invention: The through-opening has a cross-shaped structure adapted to the link of the fastening chain, and an anti-slip pad is provided on the inner wall of the side of the through-opening close to the first insertion block.

[0017] As a preferred embodiment of the present invention: The auxiliary sling includes:

[0018] A vertical rod, which is fixed on the outer wall of the top of the side bracket;

[0019] A connecting head, which is arranged on the outer wall of the top of the vertical rod;

[0020] A connecting frame, on one side of which a connecting column is provided, and the connecting column penetrates through the connecting head;

[0021] A side plate, which is rotatably installed at one end of the connecting frame;

[0022] A limiting block, one end of which penetrates through the side plate and is detachably installed on the connecting column;

[0023] A second lifting rope, one end of which is installed on the connecting frame, a side lifting ear is provided at the bottom of the second lifting seat, and the other end of the second lifting rope is installed on the side lifting ear.

[0024] As a preferred embodiment of the present invention: A pressing plate is slidably installed up and down on the vertical rod, a rubber pad is fixed at the bottom of the pressing plate, and one end of the pressing plate extends to the top of the generator top cover; a fixing part for fixing the pressing plate on the vertical rod is provided at one end of the pressing plate.

[0025] As a preferred embodiment of the present invention: The fixing part includes:

[0026] A toothed plate, a rack is provided on one side of the vertical rod, the toothed plate is adapted to the rack, and the toothed plate is horizontally slidably connected to the inner wall of one end of the pressing plate;

[0027] A fixing knob, one end of which is rotatably installed on the inner wall of the toothed plate, and the other end of the fixing knob is connected to the inner wall of the pressing plate by a thread.

[0028] As a preferred embodiment of the present invention: Positioning grooves are circumferentially distributed inside the connecting head, and convex strips adapted to the positioning grooves are provided on the outer wall of the connecting column.

[0029] As a preferred embodiment of the present invention: the second suspension seat is slidably connected to the outer wall of the first suspension seat; a hydraulic cylinder is fixed to the top of the first suspension seat, and the output end of the hydraulic cylinder is fixed to the outer wall of the top of the second suspension seat.

[0030] As a preferred embodiment of the present invention: the main lifting tool includes:

[0031] An upper lifting ear, which is installed at the bottom of the first suspension seat, and a lifting ring is installed on the upper lifting ear;

[0032] A first lifting rope, one end of which is installed on the lifting ring;

[0033] A hook, a connecting ring is provided at the top of the hook, one end of the first lifting rope is installed on the connecting ring, a lower lifting ear is provided on the top of the generator top cover, and the hook is installed on the lower lifting ear.

[0034] As a preferred embodiment of the present invention: a through groove is opened at the bottom of the hook, a guide rod is fixed in the through groove, an arc plate is slidably connected to the outer wall of the guide rod, the shape of the arc plate is adapted to the inner wall of the bottom of the hook, the arc plate and the hook are connected by a spring, a support shaft is installed in the through groove of the hook, one end of the arc plate is rotatably installed with a connecting rod, a slideway is opened on the connecting rod, the support shaft is located in the slideway, the other end of the connecting rod is hinged with a sealing plate, and a guide post is provided at one end of the hook, and the sealing plate slides on the outer wall of the guide post.

[0035] The beneficial effects of the present invention are:

[0036] By setting the auxiliary fixing mechanism, during hoisting, after connecting the main lifting tool, each first insertion block can be installed in the groove of the generator top cover, and they are equidistantly distributed in a circumferential manner. The fastening chain is passed through each side bracket and then tightened, and fixed by the locking assembly. The auxiliary lifting tool is connected to the second suspension seat and the side bracket. During hoisting, the auxiliary fixing mechanism can be used to assist hoisting, improving the weighing effect and ensuring the stability of the structure.

[0037] By setting the locking assembly, the second insertion block can be inserted into the groove, the fastening chain can be tightened as much as possible, and the two insertion rods are respectively inserted into two chain links of the fastening chain, and the baffle is installed to fix the fastening chain; by screwing the adjusting bolt, the distance between the second insertion block and the lock frame is adjusted, thereby adjusting the tightness.

[0038] By setting the cross-shaped through hole, the fastening chain can pass through better. And because the through hole is of a cross-shaped structure, when the fastening chain is tightened, it is difficult for two adjacent chain links of the chain to maintain a cross-shaped distribution, and then a certain degree of misalignment will occur with the through hole. At this time, the through hole can limit the movement of the fastening chain, further improving the firmness of the bundled state of the fastening chain.

[0039] In the present invention, by providing a secondary lifting appliance, during installation, after the connecting column of the connecting frame penetrates through the connecting head, the side plate is rotated so that its bottom end is aligned with the connecting column, and a limiting block is installed to realize the relative fixation of the side plate and the connecting column.

[0040] In the present invention, by providing a fixing part, the position of the pressing plate can be adjusted according to requirements. The pressing plate is used to press down the top cover of the generator, and the toothed plate and the rack are engaged by screwing the fixing knob to fix the pressing plate, thereby improving the firmness of the overall structure.

[0041] In the present invention, by providing a rib and a positioning groove, the position of the rib installed in the positioning groove can be adjusted according to requirements, thereby adjusting the angle of the connecting frame and improving the practicability. By providing structures such as a hydraulic cylinder, based on the operation of the hydraulic cylinder, the position of the second lifting seat can be adjusted, thereby adjusting the tightness of the second lifting rope to adjust the lifting state and improving the practicability.

[0042] In the present invention, by providing structures such as an arc plate, a connecting rod, and a sealing plate, when the lower lifting ear is installed in the hook, during lifting, due to the downward pressure of the lower lifting ear, the arc plate is pressed to the bottom position of the hook. Thus, under the restriction of the support shaft, one end of the connecting rod contracts into the hook, prompting the sealing plate to slide towards the hook on the guide post, and the sealing plate is used to close the hook; a closed-loop structure is formed between the sealing plate and the hook, improving the stability during lifting. Since the sealing plate is provided to cooperate with the hook, the hook and the lower lifting ear need to move relative to each other along a certain trajectory to achieve installation or disassembly, avoiding the risk of unhooking and improving the reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic structural diagram of a lifting device for the top cover of a hydro-generator proposed by the present invention;

[0044] Figure 2 is a schematic structural diagram of the first lifting seat and the second lifting seat of a lifting device for the top cover of a hydro-generator proposed by the present invention;

[0045] Figure 3 is a schematic structural diagram of an auxiliary fixing mechanism of a lifting device for the top cover of a hydro-generator installed on the outer side of the top cover of the generator;

[0046] Figure 4 is a schematic structural diagram of a hook of a lifting device for the top cover of a hydro-generator proposed by the present invention;

[0047] Figure 5 is a schematic sectional view structural diagram of a hook of a lifting device for the top cover of a hydro-generator proposed by the present invention;

[0048] Figure 6 is a schematic structural diagram of a fastening chain passing through the through-hole of a side bracket of a lifting device for the top cover of a hydro-generator proposed by the present invention;

[0049] Figure 7 This is a schematic cross-sectional view of a pressing plate of a lifting device for the top cover of a hydro-generator proposed by the present invention;

[0050] Figure 8 This is a schematic structural view of a locking component of a lifting device for the top cover of a hydro-generator proposed by the present invention installed on a fastening chain;

[0051] Figure 9 This is a schematic structural view of a locking component of a lifting device for the top cover of a hydro-generator proposed by the present invention.

[0052] In the figure: 1 first hanging seat, 2 first lifting rope, 3 second lifting rope, 4 connecting head, 5 fastening chain, 6 groove, 7 lower hanging ear, 8 generator top cover, 9 second hanging seat, 10 top hanging ear, 11 hydraulic cylinder, 12 side hanging ear, 13 upper hanging ear, 14 lifting ring, 15 hook, 16 pressing plate, 17 adjusting bolt, 18 guide post, 19 plugging plate, 20 connecting ring, 21 arc plate, 22 guide rod, 23 slideway, 24 support shaft, 25 connecting rod, 26 first insertion block, 27 side plate, 28 connecting frame, 29 limiting block, 30 rack, 31 fixing knob, 32 side bracket, 33 convex strip, 34 connecting column, 35 positioning groove, 36 toothed plate, 37 through hole, 38 anti-slip pad, 39 vertical rod, 40 rubber pad, 41 second insertion block, 42 baffle plate, 43 insertion rod, 44 locking frame, 45 spring. Detailed implementation manners

[0053] The technical solutions of the present invention will be further described in detail below in conjunction with the specific implementation manners.

[0054] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0055] Embodiment 1: A lifting device for the top cover of a hydro-generator, as Figures 1-9 shown, includes a first hanging seat 1. A top hanging ear 10 is provided at the top of the first hanging seat 1, and the top hanging ear 10 is connected to a lifting device; a main lifting tool for lifting the generator top cover 8 is provided at the bottom of the first hanging seat 1, and a second hanging seat 9 is provided outside the first hanging seat 1; this solution mainly aims at a generator top cover 8 with a groove 6 provided on the side. An auxiliary fixing mechanism is provided outside the generator top cover 8, and the auxiliary fixing mechanism includes:

[0056] A first insertion block 26, and the first insertion block 26 is adapted to the groove 6 on the circumferential outer side of the generator top cover 8;

[0057] Side bracket 32, the side bracket 32 is fixed to the outer wall of one end of the first insert block 26 away from the generator top cover 8;

[0058] Tightening chain 5, a through hole 37 for the tightening chain 5 to pass through is provided on the inner side of the side bracket 32. The tightening chain 5 is used to connect and tighten each side bracket 32, so as to limit each first insert block 26 in the groove 6 of the generator top cover 8;

[0059] Locking assembly, the locking assembly is used to fix the tightened tightening chain 5;

[0060] Auxiliary sling, the auxiliary sling is used to connect the second sling seat 9 and the side bracket 32;

[0061] By setting the auxiliary fixing mechanism, during hoisting, after connecting the main sling, each first insert block 26 can be installed in the groove 6 of the generator top cover 8, and they are equidistantly distributed in a circle. The tightening chain 5 is passed through each side bracket 32 and then tightened, and is fixed by the locking assembly. The auxiliary sling is connected to the second sling seat 9 and the side bracket 32. During hoisting, the auxiliary fixing mechanism can be used to assist in hoisting, improving the weighing effect and ensuring the stability of the structure.

[0062] In order to facilitate the fixing of the tightening chain 5; as Figure 8 、 Figure 9 shown, the locking assembly includes:

[0063] Second insert block 41, the second insert block 41 is adapted to the groove 6;

[0064] Locking frame 44, an adjusting bolt 17 is connected to the locking frame 44 by thread, and one end of the adjusting bolt 17 is rotatably installed on the inner wall of the second insert block 41;

[0065] Insert rod 43, both of the two insert rods 43 are fixed to the outer wall of the top of the locking frame 44. The insert rod 43 passes through the link of the tightening chain 5 and a baffle 42 is detachably installed;

[0066] By setting the locking assembly, the second insert block 41 can be inserted into the groove 6, the tightening chain 5 can be tightened as much as possible, so that the two insert rods 43 are respectively inserted into two links of the tightening chain 5, and the baffle 42 is installed to realize the fixation of the tightening chain 5; by screwing the adjusting bolt 17, the distance between the second insert block 41 and the locking frame 44 is adjusted, so as to adjust the tightness.

[0067] In order to improve the reliability; as Figure 7 shown, the through hole 37 has a cross-shaped structure adapted to the link of the tightening chain 5, and an anti-slip pad 38 is provided on the inner wall of the side of the through hole 37 close to the first insert block 26;

[0068] By setting the through-hole 37 with a cross-shaped structure, it is possible to better allow the fastening chain 5 to pass through. Moreover, since the through-hole 37 has a cross-shaped structure, when the fastening chain 5 is tightened, it is difficult for two adjacent chain links of the chain to maintain a cross-shaped distribution, and thus there will be a certain degree of misalignment with the through-hole 37. At this time, the through-hole 37 can restrict the movement of the fastening chain 5, further enhancing the firmness of the binding state of the fastening chain 5.

[0069] For the convenience of hoisting operations; as Figure 2 , Figure 3 , Figure 6 shown, the auxiliary sling includes:

[0070] A vertical rod 39, which is fixed to the outer wall of the top of the side bracket 32;

[0071] A connecting head 4, which is integrally arranged on the outer wall of the top of the vertical rod 39;

[0072] A connecting frame 28, one side of the connecting frame 28 is integrally provided with a connecting column 34, and the connecting column 34 penetrates through the connecting head 4;

[0073] A side plate 27, which is rotatably installed at one end of the connecting frame 28;

[0074] A limiting block 29, one end of the limiting block 29 penetrates through the side plate 27 and is detachably installed on the connecting column 34;

[0075] A second lifting rope 3, one end of the second lifting rope 3 is installed on the connecting frame 28, a side lifting ear 12 is arranged at the bottom of the second lifting seat 9, and the other end of the second lifting rope 3 is installed on the side lifting ear 12;

[0076] By setting the auxiliary sling, during installation, after the connecting column 34 of the connecting frame 28 penetrates through the connecting head 4, rotate the side plate 27 so that its bottom end is aligned with the connecting column 34, and install the limiting block 29 to realize the relative fixation of the side plate 27 and the connecting column 34.

[0077] To enhance the structural firmness; as Figure 6 , Figure 7 shown, a pressing plate 16 is slidably installed up and down on the vertical rod 39, a rubber pad 40 is fixed to the bottom of the pressing plate 16, and one end of the pressing plate 16 extends to the top of the generator top cover 8; a fixing part for fixing the pressing plate 16 to the vertical rod 39 is arranged at one end of the pressing plate 16.

[0078] To facilitate the fixation of the pressing plate 16; as Figure 7 shown, the fixing part includes:

[0079] A toothed plate 36, a rack 30 is arranged on one side of the vertical rod 39, the toothed plate 36 is adapted to the rack 30, and the toothed plate 36 is horizontally slidably connected to the inner wall of one end of the pressing plate 16;

[0080] The fixing knob 31 is rotatably installed at one end on the inner wall of the toothed plate 36, and the other end of the fixing knob 31 is connected to the inner wall of the pressing plate 16 by threads;

[0081] By providing the fixing part, the position of the pressing plate 16 can be adjusted according to requirements. The pressing plate 16 is used to press down the top cover 8 of the generator, and the toothed plate 36 and the rack 30 are engaged by screwing the fixing knob 31 to fix the pressing plate 16, thereby improving the firmness of the overall structure.

[0082] For facilitating the adjustment of the angle; as Figure 7 shown, a circumferentially distributed positioning groove 35 is formed inside the connecting head 4, and a rib 33 adapted to the positioning groove 35 is integrally provided on the outer wall of the connecting column 34;

[0083] By providing the rib 33 and the positioning groove 35, the position of the rib 33 installed in the positioning groove 35 can be adjusted according to requirements, thereby adjusting the angle of the connecting frame 28 and improving the practicability.

[0084] For facilitating the adjustment of the hoisting state; as Figure 1 shown, the second lifting seat 9 is slidably connected to the outer wall of the first lifting seat 1; a hydraulic cylinder 11 is fixed on the top of the first lifting seat 1, and the output end of the hydraulic cylinder 11 is fixed to the outer wall of the top of the second lifting seat 9;

[0085] By providing structures such as the hydraulic cylinder 11, the position of the second lifting seat 9 can be adjusted based on the operation of the hydraulic cylinder 11, thereby adjusting the tightness of the second lifting rope 3 to adjust the hoisting state and improving the practicability.

[0086] Embodiment 2: To facilitate the hoisting operation, the following improvements are made to this embodiment on the basis of Embodiment 1: The main hoisting tool includes:

[0087] The upper lifting ear 13 is installed at the bottom of the first lifting seat 1, and a lifting ring 14 is installed on the upper lifting ear 13;

[0088] The first lifting rope 2, one end of the first lifting rope 2 is installed on the lifting ring 14;

[0089] The hook 15, a connecting ring 20 is provided at the top of the hook 15, one end of the first lifting rope 2 is installed on the connecting ring 20, a lower lifting ear 7 is provided on the top of the top cover 8 of the generator, and the hook 15 is installed on the lower lifting ear 7.

[0090] For improving the reliability; as Figure 4 、 Figure 5As shown in the figure, a through groove is formed at the bottom of the hook 15. A guide rod 22 is fixed in the through groove. An arc plate 21 is slidably connected to the outer wall of the guide rod 22. The shape of the arc plate 21 is adapted to the inner wall of the bottom of the hook 15. The arc plate 21 and the hook 15 are connected by a spring 45. A support shaft 24 is installed in the through groove of the hook 15. One end of the arc plate 21 is rotatably installed with a connecting rod 25. A slideway 23 is formed on the connecting rod 25. The support shaft 24 is located in the slideway 23. The other end of the connecting rod 25 is hinged with a sealing plate 19. A guide post 18 is arranged at one end of the hook 15. The sealing plate 19 slides on the outer wall of the guide post 18;

[0091] By arranging structures such as the arc plate 21, the connecting rod 25 and the sealing plate 19, when the lower lifting lug 7 is installed in the hook 15, during hoisting, by using the downward pressure of the lower lifting lug 7, the arc plate 21 is pressed to the bottom position of the hook 15. Thus, under the restriction of the support shaft 24, one end of the connecting rod 25 contracts towards the inside of the hook 15, prompting the sealing plate 19 to slide towards the hook 15 on the guide post 18, and the hook 15 is closed by the sealing plate 19; a closed-loop structure is formed between the sealing plate 19 and the hook 15, improving the stability during hoisting. Since the cooperation between the sealing plate 19 and the hook 15 is provided, the hook 15 and the lower lifting lug 7 need to move relative to each other along a certain track to achieve installation or disassembly, avoiding the risk of unhooking and improving the reliability.

[0092] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A hydro-generator top cover hoisting device, characterized in that: The invention comprises a first hanging seat (1), wherein a top hanging ear (10) is arranged at the top of the first hanging seat (1), and the top hanging ear (10) is connected to a lifting device; a main lifting device for lifting a generator top cover (8) is arranged at the bottom of the first hanging seat (1), and a second hanging seat (9) is arranged outside the first hanging seat (1); a groove (6) is arranged on the side surface of the generator top cover (8); an auxiliary fixing mechanism is arranged outside the generator top cover (8), and the auxiliary fixing mechanism comprises: A first plug block (26), the first plug block (26) being adapted to fit into a groove (6) on the outer circumference of a generator top cover (8); A side bracket (32), the side bracket (32) being fixed to an outer wall of an end of the first plug block (26) away from the generator top cover (8); A fastening chain (5), wherein a through hole (37) for the fastening chain (5) to pass through is provided on the inner side of the side bracket (32), and the fastening chain (5) is used to connect the side brackets (32) in series and tighten them, thereby restricting each first plug block (26) in a groove (6) of the generator top cover (8); A locking assembly, the locking assembly being used to fix the tightened fastening chain (5); A secondary sling, the secondary sling is used to connect the second sling seat (9) and the side bracket (32); The locking assembly comprises: A second plug-in block (41), the second plug-in block (41) being adapted to fit the groove (6); A lock frame (44), the lock frame (44) being threadedly connected with an adjusting bolt (17), one end of the adjusting bolt (17) being rotatably mounted on the inner wall of the second plug block (41); Insertion rods (43), both of which are fixed to the outer wall of the top of the lock frame (44), and the insertion rods (43) are detachably mounted with baffles (42) after passing through the chain links of the fastening chain (5).

2. A hydro-generator top cover hoisting device according to claim 1, characterized in that: The through opening (37) is in a cross-shaped structure adapted to the chain ring of the fastening chain (5), and an anti-slip pad (38) is provided on an inner wall of one side of the through opening (37) close to the first plug block (26).

3. A hydro-generator top cover hoisting device according to claim 1, characterized in that: The auxiliary sling comprises: A vertical rod (39), the vertical rod (39) being fixed to the top outer wall of the side bracket (32); A connecting head (4), the connecting head (4) being arranged on the outer wall of the top of the vertical rod (39); A connecting frame (28), wherein a connecting column (34) is provided on one side of the connecting frame (28), and the connecting column (34) passes through the connecting head (4); A side plate (27) rotatably mounted on one end of the connecting frame (28); A limit block (29), one end of which passes through the side plate (27) and is detachably mounted on the connecting column (34); A second lifting rope (3), one end of the second lifting rope (3) is mounted on the connecting frame (28), a side lifting ear (12) is provided at the bottom of the second hanging seat (9), and the other end of the second lifting rope (3) is mounted on the side lifting ear (12).

4. A hydro-generator top cover hoisting device according to claim 3, characterized in that: The vertical pole (39) is slidably mounted with a pressure plate (16), a rubber pad (40) is fixed to the bottom of the pressure plate (16), one end of the pressure plate (16) extends to the top of the generator top cover (8); and a fixing portion for fixing the pressure plate (16) to the vertical pole (39) is provided at one end of the pressure plate (16).

5. A hydro-generator top cover hoisting device according to claim 4, characterized in that: The fixing portion comprises: A toothed plate (36), a rack (30) is disposed on one side of the vertical rod (39), the toothed plate (36) is matched with the rack (30), and the toothed plate (36) is horizontally slidably connected to the inner wall of one end of the pressing plate (16); A fixed knob (31), one end of which is rotatably mounted on the inner wall of the toothed plate (36), and the other end of which is connected to the inner wall of the pressing plate (16) via a thread.

6. A hydro-generator top cover hoisting device according to claim 5, characterized in that: The inner side of the connector (4) is provided with circumferentially distributed positioning grooves (35), and the outer wall of the connecting column (34) is provided with convex strips (33) matching the positioning grooves (35).

7. A hydro-generator top cover hoisting device according to claim 6, characterized in that: The second suspension seat (9) is slidably connected to the outer wall of the first suspension seat (1); a hydraulic cylinder (11) is fixed to the top of the first suspension seat (1), and the output end of the hydraulic cylinder (11) is fixed to the outer wall of the top of the second suspension seat (9).

8. A hydro-generator top cover hoisting device according to any one of claims 1 to 7, characterized in that: The main lifting device comprises: An upper lifting lug (13), the upper lifting lug (13) being mounted on the bottom of the first hanging seat (1), and a lifting ring (14) being mounted on the upper lifting lug (13); A first lifting rope (2), one end of the first lifting rope (2) being mounted on the lifting ring (14); A hook (15) is provided with a connecting ring (20) at the top of the hook (15), one end of the first lifting rope (2) is mounted on the connecting ring (20), a lower lifting ear (7) is provided at the top of the generator top cover (8), and the hook (15) is mounted on the lower lifting ear (7).

9. A hydro-generator top cover hoisting device according to claim 8, characterized in that: The bottom of the hook (15) is provided with a through groove, a guide rod (22) is fixed in the through groove, an arc plate (21) is slidably connected to the outer wall of the guide rod (22), the shape of the arc plate (21) is matched with the inner wall of the bottom of the hook (15), the arc plate (21) and the hook (15) are connected by a spring (45), a support shaft (24) is installed in the through groove of the hook (15), a connecting rod (25) is rotatably installed at one end of the arc plate (21), a slideway (23) is provided on the connecting rod (25), the support shaft (24) is located in the slideway (23), a blocking plate (19) is hingedly connected to the other end of the connecting rod (25), a guide column (18) is provided at one end of the hook (15), and the blocking plate (19) slides on the outer wall of the guide column (18).

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