Structure and method for disassembling and assembling bearing unit of semi-direct-driven wind driven generator

Abstract

The invention relates to the technical field of semi-direct-drive wind driven generators, in particular to a semi-direct-drive wind driven generator bearing unit disassembling and assembling structure and method. In order to solve the problem that in the prior art, a bearing unit of a casting type semi-direct-drive wind driven generator cannot be independently disassembled and assembled, the invention provides a novel disassembling and assembling structure and method for the bearing unit of the semi-direct-drive wind driven generator. Comprising a semi-direct-drive wind driven generator, a plurality of gap filler strips, a plurality of rotor fixing pieces, a plurality of sliding guide rods, a plurality of reset traction pieces, a plurality of ejection bolts, a fixing plate and a chain block. The bearing unit is disassembled and assembled ingeniously through the gap filler strip, the rotor fixing piece, the sliding guide rod, the reset traction piece, the ejection bolt, the bearing drawing piece and the fixing plate, the disassembling and assembling cost of the bearing unit is greatly reduced, the disassembling and assembling efficiency of the bearing unit is effectively improved, operation is easy and convenient, and the cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of semi-direct-drive wind turbine generators, and in particular to a disassembly and assembly structure and method of a bearing unit of a semi-direct-drive wind turbine generator. Background Art

[0002] Wind turbines are divided into doubly fed, direct drive and semi-direct drive according to the main transmission chain structure. Among them, semi-direct drive means that the wind blades drive the gearbox to drive the permanent magnet motor to generate electricity. It is between direct drive and doubly fed. The speed regulation of the gearbox is not as high as that of the doubly fed. The generator is also changed from the doubly fed winding type to the permanent magnet synchronous type, avoiding many defects of the direct drive drive scheme and the high-speed gearbox drive scheme. It combines the advantages of both direct drive and doubly fed wind turbines, with the advantages of compact structure, high power generation efficiency, small space occupation, etc., and is suitable for large-scale wind power. Therefore, this technology has become the main research object for domestic and foreign wind power companies to reduce costs, increase efficiency and improve competitiveness.

[0003] As we all know, after a period of operation, the bearing unit of a semi-direct-drive wind turbine needs to be maintained and replaced. However, there are still many semi-direct-drive wind turbines designed and manufactured in the early stage and still in operation in my country. Figure 1As shown, it mainly includes a stator matching A, a rotor matching B, a bearing unit C, a flange D and a rear end cover E. The stator matching A is arranged outside the rotor matching B, and the rear end face of the stator matching A is connected to the rear end cover E through a rear connecting bolt. An observation hole is opened on the rear end cover E, and a center hole is provided on the rear end cover. The diameter of the center hole is larger than the outer diameter of the flange D and the outer diameter of the bearing unit C. The stator matching A includes a stator and a base C1, the rotor matching B includes a rotor and a rotor bracket B1, and the bearing unit C includes a bearing seat C1, a hollow shaft C2, a front bearing C3, and a rear bearing C4. The front and rear ends of the hollow shaft C2 of the bearing unit C are respectively mounted on the bearing seat C1 through the front bearing C3 and the rear bearing C4. A front matching stop is provided between the front side end face of the bearing seat C1 of the bearing unit C and the rear side end face of the machine base A1 of the stator matching A, a plurality of front connection threaded blind holes are provided on the rear side end face of the machine base A1 of the stator matching A, a plurality of front connection through holes are provided on the front side end face of the bearing seat C1 of the bearing unit C, which are respectively matched with the plurality of front connection threaded blind holes, the front connection threaded blind holes and the front connection through holes are matched with front connection bolts, and the bearing seat and the machine base are fixed by the front connection bolts, a rear matching stop is provided between the inner edge of the rear end face of the rotor bracket B1 and the outer edge of the front end face of the flange D, and the rear end of the rotor bracket B1 The inner edge of the surface is provided with multiple external connecting threaded blind holes, the outer edge stop of the front end surface of the flange D is provided with multiple external connecting through holes respectively matched with the multiple external connecting threaded blind holes, the external connecting threaded blind holes and the external connecting through holes are matched with external connecting bolts, and the flange and the rotor bracket are fixed by the external connecting bolts, the inner edge of the front end surface of the flange D is provided with multiple internal connecting through holes, and the rear end surface of the hollow shaft C2 is provided with multiple internal connecting threaded blind holes respectively matched with the multiple internal connecting through holes, the internal connecting through holes and the internal bolt threaded blind holes are matched with internal connecting bolts, and the flange and the bearing unit are fixed by the internal connecting bolts.

[0004] The stator frame A1 and rotor bracket B1 of the semi-direct-drive wind turbine are both cast structures, which are large in size and weight. When the internal bearing unit is maintained or replaced, the bearing unit can only be disassembled and assembled after the wind turbine unit is separated from the tower and the hub by lifting equipment and shipping. The bearing unit cannot be disassembled and assembled separately. However, for offshore units, the high lifting and shipping costs seriously restrict the maintenance of the semi-direct-drive wind turbine. In addition, the space in the generator cabin is small, the lifting capacity is insufficient, and the feasibility is low, which in turn affects the normal operation of the existing cast semi-direct-drive wind turbine. Summary of the invention

[0005] In order to solve the problem that the prior art cannot individually disassemble and assemble the bearing unit of a casting-type semi-direct-drive wind turbine, the present invention provides a new disassembly and assembly structure and method for the bearing unit of a semi-direct-drive wind turbine.

[0006] The present invention is achieved by adopting the following technical solutions: A semi-direct-drive wind turbine bearing unit disassembly and assembly structure, comprising a semi-direct-drive wind turbine, a plurality of gap gaskets, a plurality of rotor fixings, a plurality of sliding guide rods, a plurality of reset traction members, a plurality of ejection bolts, a fixing plate, and a hand chain hoist; The semi-direct-drive wind turbine includes a stator supporting part, a rotor supporting part, a bearing unit, a flange and a rear end cover. The stator supporting part includes a stator and a machine base. The rotor supporting part includes a rotor and a rotor bracket. The bearing unit includes a bearing seat, a hollow shaft, a front bearing and a rear bearing. An observation hole is provided on the rear end cover. The inner edge of the rear end face of the rotor bracket is provided with a plurality of external connection threaded blind holes. The outer edge of the front end face of the flange is provided with a plurality of external connection through holes respectively matched with the plurality of external connection threaded holes. The rear side end face of the machine base supporting the stator is provided with a plurality of front connection threaded blind holes. The front side end face of the bearing seat of the bearing unit is provided with a plurality of front connection through holes respectively matched with the plurality of front connection threaded blind holes. A plurality of fixed threaded blind holes are provided on the rear side face of the middle part of the machine base corresponding to the rotor bracket. A plurality of fixed through holes matched with the fixed threaded blind holes are evenly distributed circumferentially on the rotor bracket. The flange is provided with a flange lifting hole for matching with a hand chain hoist during disassembly and assembly. Multiple gap pads are set between the stator and the rotor to prevent the two from sticking together during disassembly and assembly; A plurality of rotor fixing members, each of which is formed by three sections connected in one piece and are respectively a first threaded section, a first cylindrical section, and a first nut section, wherein the plurality of first threaded sections are respectively adapted to the plurality of fixed threaded blind holes on the machine base, and the plurality of first cylindrical sections are respectively clearance-matched to the plurality of fixed through holes on the rotor bracket; A plurality of sliding guide rods, each of which is formed by two sections connected in one piece and are sequentially a second threaded section and a second cylindrical section, the plurality of second threaded sections are adapted to the plurality of external connection threaded blind holes on the rotor bracket and the plurality of front connection threaded blind holes on the machine base, the plurality of second cylindrical sections are slidably matched with the plurality of external connection through holes on the outer edge of the flange and the plurality of front connection through holes on the bearing seat, the front end of the second cylindrical section is provided with two positioning holes front and rear, and the two positioning holes are adapted to limit pins; A plurality of reset traction members, each of which is formed by three sections connected in one piece and is sequentially a third threaded section, a third cylindrical section, and a third nut section, the plurality of third threaded sections are adapted to the plurality of external connection threaded blind holes on the rotor bracket and the plurality of front connection threaded blind holes on the machine base, the plurality of third cylindrical sections are slidably matched with the plurality of external connection through holes on the outer edge of the flange and the plurality of front connection through holes on the bearing seat, the plurality of cylindrical sections are slidably adapted with a plurality of nylon collars for pushing the flange and the bearing unit forward for sliding reinstallation, the sum of the number of the sliding guide rods and the reset traction members is equal to the number of the front connection threaded blind holes and the number of the external connection threaded blind holes; A fixed plate is provided with a fixed lifting hole for fitting and connecting with a hand chain hoist when disassembling and assembling the bearing unit, and is also provided with a plurality of sliding holes respectively fitting with the second cylindrical sections on the plurality of sliding guide rods for front and rear sliding. When disassembling and assembling the bearing unit, the fixed plate is limited between the two limit pins on the sliding guide rod; Multiple ejector bolts, multiple flange ejector threaded through holes adapted to the ejector bolts are evenly distributed on the outer edge of the flange in the circumferential direction, and multiple bearing ejector threaded through holes adapted to the ejector bolts are evenly distributed on the front end surface axis of the bearing seat; Hand chain hoist is used to hang the fixing plate and flange during disassembly and assembly.

[0007] Furthermore, the structure also includes a bearing puller for hooking the rear bearing out of the bearing seat, so as to facilitate separate disassembly of the rear bearing.

[0008] Furthermore, the rear bearing is a cylindrical roller bearing, and the bearing pulling member is a nearly U-shaped pulling rod, and the length of one end of the nearly U-shaped pulling rod is less than the height of the roller gap in the cylindrical roller bearing. When in use, the bearing seat and the inner ring of the rear bearing are heated, and one end of the rod passes through the roller gap of the rear bearing and then hooks the end on the outer ring or inner ring of the rear bearing, and pulls hard to pull out the inner ring or outer ring of the rear bearing.

[0009] Furthermore, the structure also includes a medium frequency heater and a copper rod. The medium frequency heater is used to heat the bearing seat and the inner ring of the rear bearing, and the copper rod is used to knock the bearing unit when it is reset and installed.

[0010] Furthermore, the fixing plate is also provided with a through hole that is adapted to slide forward and backward with the flange ejection threaded through hole and the bearing ejection threaded through hole. After the ejection bolt ejects the flange or the bearing unit from the rear mating stop and the front mating stop, the ejection bolt does not need to be removed when disassembling the flange or the bearing unit, and can further play a guiding and load-bearing role when disassembling and assembling the flange or the bearing unit.

[0011] Furthermore, there are five external connection threaded blind holes, five front connection threaded blind holes, five external connection through holes, five front connection through holes, three sliding guide rods, two ejection bolts, and two reset traction parts, making the structure specific and standardized.

[0012] Furthermore, the shape of the fixed plate is triangular, the fixed lifting hole is located at the top corner of the fixed plate, and multiple sliding holes are located at the three corners of the fixed plate, and there are multiple sliding holes at each corner, which is convenient for adapting to sliding guide rods in different positions on wind turbines of different specifications, and has a wide range of applications.

[0013] Furthermore, the gap pad is L-shaped, which is convenient for installation.

[0014] A method for disassembling and assembling a bearing unit of a semi-direct-drive wind turbine generator is provided. During disassembly and assembly, the above structure is used to realize the disassembly and assembly of the bearing unit, and specifically comprises the following steps: 1) A hand chain hoist is hung in the generator cabin, and the flange is connected to the hand chain hoist through the flange lifting hole. The flange is rotated by the hand chain hoist, thereby driving the rotor bracket to rotate until the fixed through hole on the rotor bracket is aligned with the fixed threaded blind hole on the base; 2) The maintenance personnel enter the interior of the wind turbine through the observation hole opened on the rear cover, first install the rotor fixing parts to lock the relative position of the machine base and the rotor bracket, and then evenly install multiple gap pads between the stator and the rotor; 3) Remove the inner connecting bolts between the flange and the hollow shaft, remove the outer connecting bolts between the flange and the rotor, slide the multiple sliding guide rods through the outer connecting through holes of the flange and then thread them into the outer connecting threaded blind holes of the rotor bracket, and thread the ejector bolts into the flange ejector threaded through holes of the flange. Turn the ejector bolts to separate the flange from the rotor bracket, and then slide the flange axially along the sliding guide rods out of the wind turbine. Finally, lift the flange to a suitable position by a hand chain hoist, remove the connection between the flange and the hand chain hoist, and complete the removal of the flange. 4) Remove the front connecting bolts between the bearing seat and the machine base, and slide the multiple sliding guide rods through the front connecting through holes on the bearing seat and then threadedly connected to the front connecting threaded blind holes of the machine base. The fixing plate is hung on the hand chain hoist. The front ends of the multiple sliding guide rods pass through the sliding holes on the fixing plate, and the fixing plate is fixed in position by the limit pins on the sliding guide rods. The ejector bolts are threadedly connected to the bearing ejector threaded through holes of the bearing seat. The ejector bolts are rotated to separate the bearing unit from the machine base. Then, the bearing unit is axially slid out of the wind turbine along the sliding guide rod. The bearing ejector threaded through holes on the bearing seat and the internal connecting threaded blind holes on the hollow shaft are connected to the lifting eye screws. The bearing unit is hung on the hand chain hoist through the lifting eye screws. The connection between the fixing plate and the hand chain hoist is removed. The fixing plate is removed. Then, the bearing unit is axially slid out of the wind turbine along the sliding guide rod. The bearing unit is vertically placed in the generator cabin by the hand chain hoist, thereby completing the removal of the bearing unit. 5) When reinstalling, follow the above steps in reverse order. In addition, the bearing unit and flange need to slide forward when reinstalling. A reset traction piece is required for sliding forward. When reinstalling, the second threaded section of the reset traction piece is threadedly connected to the front connection threaded blind hole of the machine base or the external connection threaded blind hole of the rotor bracket. At this time, a nylon collar is sleeved on the reset traction piece. The nylon collar on the reset traction piece is abutted by screwing the reset traction piece to push the bearing unit or flange to slide forward. When screwing to the limit, the reset traction piece is removed and removed, and a nylon collar is added. Then the second threaded section of the reset traction piece is threadedly connected to the front connection threaded blind hole of the machine base or the external connection threaded blind hole of the rotor bracket. The reset traction piece is continued to be screwed, and the two nylon collars on the reset traction piece are abutted to push the bearing unit or flange to slide forward. By analogy, the bearing unit or flange is continuously slid forward by adding nylon collars until the bearing unit or flange is reinstalled in place. Finally, the front connection bolts or the inner connection bolts and the outer connection bolts are installed to complete the reinstallation of the bearing unit and the flange.

[0015] Furthermore, when only the rear bearing of the bearing unit needs to be removed, after the flange is removed according to the above steps 1), 2), and 3), the heating tape of the medium frequency heater is wrapped around the outer circumferential surface of the bearing seat corresponding to the rear bearing, the bearing seat is heated so that the bearing seat expands due to heat and a gap is generated between the bearing seat and the outer ring of the rear bearing, the outer ring of the rear bearing is then pulled out with a bearing puller, and the outer ring of the rear bearing is lifted to a suitable position by a hand chain hoist; the heating tape of the medium frequency heater is wrapped around the outer circumferential surface of the inner ring of the rear bearing, the inner ring of the rear bearing is heated so that the inner ring of the rear bearing expands due to heat and a gap is generated between the hollow shaft, the inner ring of the rear bearing is then pulled out with a bearing puller, and the inner ring of the rear bearing is lifted to a suitable position by a hand chain hoist. When reinstalling the rear bearing of the bearing unit, the inner ring of the rear bearing is first installed and then the outer ring of the rear bearing is installed, and the copper rod is used for reinstallation. After the rear bearing is reinstalled, the flange can be reinstalled according to the method of reinstalling the flange in the above step 5).

[0016] The beneficial effects produced by the present invention are as follows: the present invention cleverly realizes the disassembly and assembly of the bearing unit through gap pads, rotor fixings, sliding guide rods, reset traction parts, ejection bolts, bearing pullers, and fixing plates, which greatly reduces the cost of disassembly and assembly of the bearing unit, effectively improves the efficiency of disassembly and assembly of the bearing unit, and is simple, convenient, and low-cost to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a schematic diagram of the structure of a casting type semi-direct drive wind turbine; Figure 2 It is a schematic diagram of the gap pad structure in the disassembly and assembly structure of the present invention; Figure 3 It is a schematic diagram of the structure of the rotor fixing member in the disassembly and assembly structure of the present invention; Figure 4 It is a schematic diagram of the structure of the sliding guide rod in the disassembly and assembly structure of the present invention; Figure 5 It is a structural schematic diagram of a bearing puller in the disassembly and assembly structure of the present invention; Figure 6 It is a schematic diagram of the structure of the resetting traction member in the disassembly and assembly structure of the present invention; Figure 7 It is a schematic diagram of the structure of the triangular fixing plate in the disassembly and assembly structure of the present invention; Figure 8 It is a schematic diagram of the disassembled flange structure of the present invention; Fig. 9 It is a schematic diagram of the structure of the outer ring of the bearing after disassembly of the present invention; Fig.10 It is a schematic diagram of the structure of the inner ring of the bearing after disassembly of the present invention; Fig.11 This is a schematic diagram of the structure of the reassembled flange of the present invention; Fig.12 It is a schematic diagram of the use state of the ejector bolt of the present invention when disassembling the bearing unit; Fig.13 This is a schematic diagram of the disassembled bearing unit structure of the present invention; Fig.14 It is a schematic diagram of the structure of the reassembled bearing unit of the present invention.

[0020] In the figure: A-stator matching, B-rotor matching, C-bearing unit, D-flange, E-rear end cover, A1-machine base, B1-rotor bracket, C1-bearing seat, C2-hollow shaft, C3-front bearing, C4-rear bearing, E1-observation hole, 1-gap pad, 2-rotor fixing part, 21-first threaded section, 22-first cylindrical section, 23-first nut section, 3-sliding guide rod, 31-second threaded section, 32-second cylindrical section, 4-bearing pulling part, 5-resetting traction part, 51-third threaded section, 52-third cylindrical section, 53-third nut section, 54-nylon collar, 6-ejection bolt, 7-fixing plate, 71-fixed lifting hole, 72-sliding hole, 73-through hole, 8-hand chain hoist. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0022] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] like Figures 1 to 7 As shown, a semi-direct-drive wind turbine bearing unit disassembly and assembly structure includes a semi-direct-drive wind turbine, a plurality of gap gaskets 1, a plurality of rotor fixing members 2, a plurality of sliding guide rods 3, a plurality of reset traction members 5, a plurality of ejection bolts 6, a fixing plate 7, and a hand chain hoist 8; The semi-direct drive wind turbine generator includes a stator set A, a rotor set B, a bearing unit C, a flange D and a rear end cover E. The stator set A includes a stator and a base A1, the rotor set B includes a rotor and a rotor bracket B1, the bearing unit C includes a bearing seat C1, a hollow shaft C2, a front bearing C3, and a rear bearing C4. The rear end cover E is provided with an observation hole E1, the inner edge of the rear end face of the rotor bracket B1 is provided with a plurality of external connection threaded blind holes, and the outer edge of the front end face of the flange D is provided with a plurality of external connection threaded blind holes respectively matched with the plurality of external connection threaded holes. Connecting through hole 73, a plurality of front connecting threaded blind holes are provided on the rear side end face of the base A1 of the stator matching A, a plurality of front connecting through holes respectively matched with the plurality of front connecting threaded blind holes are provided on the front side end face of the bearing seat C1 of the bearing unit C, a plurality of fixing threaded blind holes are provided on the middle rear side face of the base A1 corresponding to the rotor bracket B1, a plurality of fixing through holes 73 matched with the fixing threaded blind holes are evenly distributed on the rotor bracket B1 in the circumferential direction, and a flange hoisting hole for matching and connecting with the hand chain hoist 8 during disassembly and assembly is provided on the flange plate D; A plurality of gap gaskets 1 are arranged between the gap between the stator and the rotor to prevent the two from being adsorbed during disassembly and assembly (in specific implementation, the gap gaskets 1 are generally made of anti-magnetic metal materials, such as copper plates and stainless steel); A plurality of rotor fixing members 2, each of which is formed by three sections connected in one piece and are respectively a first threaded section 21, a first cylindrical section 22, and a first nut section 23, wherein the plurality of first threaded sections 21 are respectively adapted to the plurality of fixed threaded blind holes on the base A1, and the plurality of first cylindrical sections 22 are respectively clearance-matched to the plurality of fixed through holes 73 on the rotor bracket B1; A plurality of sliding guide rods 3, each of which is formed by two sections connected in one piece and are respectively a second threaded section 31 and a second cylindrical section 32, the plurality of second threaded sections 31 are adapted to the plurality of external connection threaded blind holes on the rotor bracket B1 and the plurality of front connection threaded blind holes on the base A1, the plurality of second cylindrical sections 32 are slidably matched to the plurality of external connection through holes 73 on the outer edge of the flange D and the plurality of front connection through holes 73 on the bearing seat, the front end of the second cylindrical section 32 is provided with two positioning holes front and rear, and the two positioning holes are adapted to limit pins; A plurality of reset traction members 5, each of which is formed by three sections connected in one piece and are respectively a third threaded section 51, a third cylindrical section 52, and a third nut section 53. The plurality of third threaded sections 51 are all adapted to the plurality of external connection threaded blind holes on the rotor bracket B1 and the plurality of front connection threaded blind holes on the machine base A1. The plurality of third cylindrical sections 52 are all slidably matched with the plurality of external connection through holes 73 on the outer edge of the flange D and the plurality of front connection through holes 73 on the bearing seat. The plurality of cylindrical sections are all slidably adapted with a plurality of nylon collars 54 for pushing the flange D and the bearing unit C to slide forward for reinstallation. The sum of the number of the sliding guide rod 3 and the reset traction members 5 is equal to the number of the front connection threaded blind holes and the number of the external connection threaded blind holes. The fixed plate 7 is provided with a fixed lifting hole 71 for being adapted to be connected with the hand chain hoist 8 when the bearing unit C is disassembled and assembled, and is also provided with a plurality of sliding holes 72 respectively adapted to slide forward and backward with the second cylindrical sections 32 on the plurality of sliding guide rods 3. When the bearing unit C is disassembled and assembled, the fixed plate 7 is limited between the two limit pins on the sliding guide rod 3; Multiple ejector bolts 6, multiple flange ejector threaded through holes adapted to the ejector bolts 6 are evenly distributed on the outer edge of the flange D in the circumferential direction, and multiple bearing ejector threaded through holes adapted to the ejector bolts 6 are evenly distributed on the front end surface axis of the bearing seat C1; The hand chain hoist 8 is used to hang the fixing plate 7 and the flange D during disassembly and assembly.

[0026] Furthermore, the structure also includes a bearing puller 4, which is used to hook the rear bearing C4 out of the bearing seat C1, so as to facilitate the separate removal of the rear bearing C4.

[0027] Furthermore, the rear bearing C4 is a cylindrical roller bearing, and the bearing puller 4 is a nearly U-shaped puller rod, and the length of one end of the nearly U-shaped puller rod is less than the height of the roller gap in the cylindrical roller bearing. When in use, the bearing seat C1 and the inner ring of the rear bearing C4 are heated, and one end of the rod passes through the roller gap of the rear bearing C4 and then hooks the end on the outer ring or inner ring of the rear bearing C4, and pulls hard to pull out the inner ring or outer ring of the rear bearing C4.

[0028] Furthermore, the structure also includes a medium frequency heater and a copper rod. The medium frequency heater is used to heat the bearing seat C1 and the inner ring of the rear bearing C4, and the copper rod is used to knock the bearing unit C when resetting and installing it.

[0029] Furthermore, the fixing plate 7 is also provided with a through hole 73 that is adapted to slide forward and backward with the flange ejection threaded through hole and the bearing ejection threaded through hole. After the ejection bolt 6 ejects the flange D or the bearing unit C from the rear mating stop and the front mating stop, the ejection bolt 6 does not need to be removed when the flange D or the bearing unit C is disassembled, and can further play a guiding and load-bearing role when the flange D or the bearing unit C is disassembled.

[0030] Furthermore, there are five external connection threaded blind holes, five front connection threaded blind holes, five external connection through holes 73 and five front connection through holes 73, three sliding guide rods 3, two ejection bolts 6 and two resetting traction members 5, making the structure more specific and standardized.

[0031] Furthermore, the shape of the fixed plate 7 is a triangle, the fixed lifting hole 71 is located at the top corner of the fixed plate 7, and the multiple sliding holes 72 are located at the three corners of the fixed plate 7, and there are multiple sliding holes 72 at each corner, which is convenient for adapting to the sliding guide rods 3 at different positions on wind turbines of different specifications, and has a wide range of applications.

[0032] Furthermore, the gap gasket 1 is L-shaped, which is convenient for installation.

[0033] A method for disassembling and assembling a bearing unit C of a semi-direct-drive wind turbine generator, wherein the above structure is used to realize the disassembly and assembly of the bearing unit C, and specifically comprises the following steps: 1) A hand chain hoist 8 is mounted in the generator cabin, and the flange D is connected to the hand chain hoist 8 through the flange lifting hole. The flange D is rotated by the hand chain hoist 8, thereby driving the rotor bracket B1 to rotate until the fixed through hole 73 on the rotor bracket B1 is aligned with the fixed threaded blind hole on the base A1; 2) The maintenance personnel enter the interior of the wind turbine through the observation hole E1 opened on the rear cover E, first install the rotor fixing part 2 to lock the relative position of the machine base A1 and the rotor bracket B1, and then evenly install multiple gap spacers 1 between the stator and the rotor; 3) Remove the inner connecting bolts between the flange D and the hollow shaft C2, remove the outer connecting bolts between the flange D and the rotor, slide the multiple sliding guide rods 3 through the outer connecting through holes 73 of the flange D respectively, and then thread them into the outer connecting threaded blind holes of the rotor bracket B1, and thread the ejector bolts 6 into the flange ejector threaded through holes of the flange D. Rotate the ejector bolts 6, and the flange D is separated from the rotor bracket B1. Then, the flange D is axially slid out of the wind turbine along the sliding guide rods 3. Finally, the flange D is lifted to a suitable position by the hand chain hoist 8, and the connection between the flange D and the hand chain hoist 8 is removed, thereby completing the removal of the flange D. Figure 8 As shown; 4) If Fig.12 , 13 As shown, the front connecting bolts between the bearing seat C1 and the machine base A1 are removed, and the plurality of sliding guide rods 3 slide through the front connecting through holes 73 on the bearing seat C1 and are then threadedly connected to the front connecting threaded blind holes of the machine base A1. The fixing plate 7 is hung on the hand chain hoist 8, and the front ends of the plurality of sliding guide rods 3 pass through the sliding holes 72 on the fixing plate 7, and the fixing plate 7 is fixed in position by the limit pins on the sliding guide rods 3. The ejector bolts 6 are threadedly connected to the bearing ejector threaded through holes of the bearing seat C1, and the ejector bolts 6 are rotated, so that the bearing unit C is separated from the machine base A1. , then slide the bearing unit C axially along the sliding guide rod 3 out of the wind turbine, connect the bearing ejection threaded through hole on the bearing seat C1 and the internal connection threaded blind hole on the hollow shaft C2 with eye screws, hang the bearing unit C on the hand chain hoist 8 through the eye screws, remove the connection between the fixing plate 7 and the hand chain hoist 8, remove the fixing plate 7, then slide the bearing unit C axially along the sliding guide rod 3 out of the wind turbine, and place the bearing unit C vertically in the generator cabin through the hand chain hoist 8, thereby completing the removal of the bearing unit C; 5) When reinstalling, follow the above steps in reverse order. In addition, Fig.11 , Fig.14As shown, the bearing unit C and the flange D need to slide forward when they are reinstalled, and a reset traction member 5 is required for sliding forward. When reinstalling, the second threaded section 31 of the reset traction member 5 is threadedly connected to the front connecting threaded blind hole of the machine base A1 or the external connecting threaded blind hole of the rotor bracket B1. At this time, a nylon ring 54 is sleeved on the reset traction member 5. The nylon ring 54 on the reset traction member 5 is abutted by screwing the reset traction member 5 to push the bearing unit C or the flange D to slide forward. When it is screwed to the limit, the reset traction member 5 is removed and removed, and another nylon ring 54 is added. Then the second threaded section 31 of the reset traction member 5 is threadedly connected to the front connecting threaded blind hole of the machine base A1 or the external connecting threaded blind hole of the rotor bracket B1, and the reset traction member 5 is continued to be screwed. The two nylon rings 54 on the reset traction member 5 are abutted to push the bearing unit C or the flange D to slide forward. By analogy, by adding the nylon ring 54, the bearing unit C or the flange D is continuously slid forward until the bearing unit C or the flange D is reinstalled in place, and finally the front connecting bolts or the inner connecting bolts and the outer connecting bolts are installed to complete the reinstallation of the bearing unit C and the flange D.

[0034] Furthermore, when only the rear bearing C4 of the bearing unit C needs to be removed, the flange D is removed according to the above steps 1), 2), and 3). Fig. 9 , 10 As shown, the heating belt of the medium frequency heater is wound around the outer circumferential surface of the bearing seat C1 corresponding to the rear bearing C4, the bearing seat C1 is heated so that the bearing seat C1 expands due to heat and a gap is generated between the bearing seat C1 and the outer ring of the rear bearing C4, and then the outer ring of the rear bearing C4 is pulled out by the bearing puller 4, and the outer ring of the rear bearing C4 is hoisted to a suitable position by the hand chain hoist 8; the heating belt of the medium frequency heater is wound around the outer circumferential surface of the inner ring of the rear bearing C4, the inner ring of the rear bearing C4 is heated so that it expands due to heat and a gap is generated between the hollow shaft C2, and then the inner ring of the rear bearing C4 is pulled out by the bearing puller 4, and the inner ring of the rear bearing C4 is hoisted to a suitable position by the hand chain hoist 8. When reinstalling the rear bearing C4 of the bearing unit C, the inner ring of the rear bearing C4 is first installed, and then the outer ring of the rear bearing C4 is installed, and the copper rod is used for reinstallation. After the rear bearing C4 is reinstalled, the flange D can be reinstalled according to the method of reinstalling the flange D in the above step 5).

[0035] The above is only a specific implementation of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A semi-direct-drive wind turbine bearing unit disassembly and assembly structure, comprising a semi-direct-drive wind turbine, characterized in that the structure further comprises a plurality of gap gaskets (1), a plurality of rotor fixing members (2), a plurality of sliding guide rods (3), a plurality of reset traction members (5), a plurality of ejection bolts (6), a fixing plate (7), and a hand chain hoist (8); The semi-direct-drive wind turbine generator comprises a stator assembly (A), a rotor assembly (B), a bearing unit (C), a flange (D) and a rear end cover (E), wherein the stator assembly (A) comprises a stator and a base (A1), the rotor assembly (B) comprises a rotor and a rotor bracket (B1), the bearing unit (C) comprises a bearing seat (C1), a hollow shaft (C2), a front bearing (C3) and a rear bearing (C4), an observation hole (E1) is provided on the rear end cover (E), a plurality of externally connected threaded blind holes are provided on the inner edge of the rear end face of the rotor bracket (B1), a plurality of externally connected threaded blind holes are provided on the outer edge of the front end face of the flange (D) The outer connecting through hole (73) is matched with the groove hole, the rear side end surface of the machine base (A1) of the stator matching (A) is provided with a plurality of front connecting threaded blind holes, the front side end surface of the bearing seat (C1) of the bearing unit (C) is provided with a plurality of front connecting through holes respectively matched with the plurality of front connecting threaded blind holes, the middle rear side surface of the machine base (A1) corresponding to the rotor bracket (B1) is provided with a plurality of fixing threaded blind holes, the rotor bracket (B1) is evenly distributed with a plurality of fixing through holes (73) matched with the fixing threaded blind holes in the circumferential direction, and the flange plate (D) is provided with a flange lifting hole for matching and connecting with the hand chain hoist (8) during disassembly and assembly; A plurality of gap gaskets (1) are arranged between the stator and the rotor to prevent the two from being adsorbed during disassembly and assembly; A plurality of rotor fixing members (2), each of which is formed by three sections connected in one piece and which are, in sequence, a first threaded section (21), a first cylindrical section (22), and a first nut section (23); the plurality of first threaded sections (21) are respectively adapted to a plurality of fixing threaded blind holes on the machine base (A1); and the plurality of first cylindrical sections (22) are respectively clearance-matched to a plurality of fixing through holes (73) on the rotor bracket (B1); A plurality of sliding guide rods (3), each of which is formed by two sections connected in one piece and which are, in sequence, a second threaded section (31) and a second cylindrical section (32); the plurality of second threaded sections (31) are adapted to a plurality of external connection threaded blind holes on the rotor support (B1) and a plurality of front connection threaded blind holes on the machine base (A1); the plurality of second cylindrical sections (32) are slidingly adapted to a plurality of external connection through holes (73) on the outer edge of the flange (D) and a plurality of front connection through holes (73) on the bearing seat (C1); a front end portion of the second cylindrical section (32) is provided with two positioning holes distributed front and rear, and limit pins are adapted to the two positioning holes; A plurality of reset traction members (5), each of which is formed by three sections connected in one piece and which are, in order, a third threaded section (51), a third cylindrical section (52), and a third nut section (53); the plurality of third threaded sections (51) are all adapted to a plurality of external connection threaded blind holes on the rotor support (B1) and a plurality of front connection threaded blind holes on the machine base (A1); the plurality of third cylindrical sections (52) are all slidably adapted to a plurality of external connection through holes (73) on the outer edge of the flange (D) and a plurality of front connection through holes (73) on the bearing seat (C1); the plurality of cylindrical sections are all slidably adapted to be provided with a plurality of nylon collars (54) for pushing the flange (D) and the bearing unit (C) forward for sliding reinstallation; the sum of the number of the sliding guide rod (3) and the reset traction member (5) is equal to the number of the front connection threaded blind holes and the number of the external connection threaded blind holes; A fixed plate (7) is provided with a fixed lifting hole (71) for being adapted to be connected to a hand chain hoist (8) when the bearing unit (C) is disassembled and assembled, and a plurality of sliding holes (72) are also provided on the fixed plate for respectively being adapted to slide forward and backward with the second cylindrical sections (32) on the plurality of sliding guide rods (3). When the bearing unit (C) is disassembled and assembled, the fixed plate (7) is limited between two limit pins on the sliding guide rod (3); A plurality of ejector bolts (6), a plurality of flange ejector threaded through holes adapted to the ejector bolts (6) are evenly distributed in the circumferential direction on the outer edge of the flange plate (D), and a plurality of bearing ejector threaded through holes adapted to the ejector bolts (6) are evenly distributed on the front end surface axis of the bearing seat (C1); The hand chain hoist (8) is used to hang the fixing plate (7) and the flange (D) during disassembly and assembly.

2. A semi-direct drive wind turbine bearing unit disassembly and assembly structure according to claim 1, characterized in that: The structure also includes a bearing puller (4) for hooking the rear bearing (C4) out of the bearing seat (C1).

3. A semi-direct drive wind turbine bearing unit disassembly and assembly structure according to claim 2, characterized in that: The rear bearing (C4) is a cylindrical roller bearing, and the bearing puller (4) is a nearly U-shaped puller rod, wherein the length of one end of the nearly U-shaped puller rod is less than the roller gap height in the cylindrical roller bearing.

4. A semi-direct drive wind turbine bearing unit disassembly and assembly structure according to claim 3, characterized in that: The structure also includes a medium frequency heater and a copper rod. The medium frequency heater is used to heat the bearing seat (C1) and the inner ring of the rear bearing (C4), and the copper rod is used to knock the bearing unit (C) when resetting and installing it.

5. A semi-direct drive wind turbine bearing unit disassembly and assembly structure according to claim 4, characterized in that: The fixing plate (7) is also provided with a through hole (73) adapted to slide forward and backward with the flange ejection threaded through hole and the bearing ejection threaded through hole.

6. A semi-direct drive wind turbine bearing unit disassembly and assembly structure according to claim 5, characterized in that: There are five external connection threaded blind holes, five front connection threaded blind holes, five external connection through holes (73), and five front connection through holes (73), three sliding guide rods (3), two ejection bolts (6), and two reset traction members (5).

7. A semi-direct drive wind turbine bearing unit disassembly and assembly structure according to claim 6, characterized in that: The fixed plate (7) is in the shape of a triangle, the fixed hoisting hole (71) is located at the top corner of the fixed plate (7), and the plurality of sliding holes (72) are located at three corners of the fixed plate (7), with a plurality of sliding holes (72) being provided at each corner.

8. A semi-direct drive wind turbine bearing unit disassembly and assembly structure according to claim 7, characterized in that: The gap pad (1) is L-shaped.

9. A method for disassembling and assembling a bearing unit of a semi-direct drive wind turbine generator, characterized in that: The method is implemented by using a semi-direct drive wind turbine bearing unit disassembly and assembly structure as claimed in any one of claims 1 to 4, and specifically comprises the following steps: 1) A hand chain hoist (8) is mounted in the generator cabin, and the flange (D) is connected to the hand chain hoist (8) through the flange lifting hole. The flange (D) is rotated by the hand chain hoist (8), thereby driving the rotor bracket (B1) to rotate until the fixed through hole (73) on the rotor bracket (B1) is aligned with the fixed threaded blind hole on the base (A1); 2) The maintenance personnel enter the interior of the wind turbine through the observation hole (E1) opened on the rear cover (E), first install the rotor fixing part (2) to lock the relative position of the machine base (A1) and the rotor bracket (B1), and then evenly install multiple gap spacers (1) between the stator and the rotor; 3) Remove the inner connecting bolts between the flange (D) and the hollow shaft (C2), remove the outer connecting bolts between the flange (D) and the rotor, slide the plurality of sliding guide rods (3) through the outer connecting through holes (73) of the flange (D) and then threadedly connect them to the outer connecting threaded blind holes of the rotor bracket (B1), and thread the ejector bolts (6) to the flange ejector threaded through holes of the flange (D). Rotate the ejector bolts (6) to separate the flange (D) from the rotor bracket (B1), and then slide the flange (D) axially along the sliding guide rods (3) out of the wind turbine. Finally, hoist the flange (D) to a suitable position by means of a hand chain hoist (8), remove the connection between the flange (D) and the hand chain hoist (8), and thus complete the removal of the flange (D); 4) Remove the front connecting bolts between the bearing seat (C1) and the machine base (A1), slide the plurality of sliding guide rods (3) through the front connecting through holes (73) on the bearing seat (C1) and then threadedly connect to the front connecting threaded blind holes of the machine base (A1), hang the fixing plate (7) on the hand chain hoist (8), the front ends of the plurality of sliding guide rods (3) pass through the sliding holes (72) on the fixing plate (7), and the fixing plate (7) is fixed in position by the limit pins on the sliding guide rods (3), the ejector bolts (6) are threadedly connected to the bearing ejector threaded through holes of the bearing seat (C1), rotate the ejector bolts (6), and the bearing unit (C) is separated from the machine base. (A1), then the bearing unit (C) is axially slid out of the wind turbine along the sliding guide rod (3), the bearing ejection threaded through hole on the bearing seat (C1) and the internal connection threaded blind hole on the hollow shaft (C2) are connected to the eye screws, the bearing unit (C) is hung on the hand chain hoist (8) through the eye screws, the connection between the fixing plate (7) and the hand chain hoist (8) is removed, the fixing plate (7) is removed, and then the bearing unit (C) is axially slid out of the wind turbine along the sliding guide rod (3), and the bearing unit (C) is vertically placed in the generator cabin through the hand chain hoist (8), thereby completing the removal of the bearing unit (C); 5) When reinstalling, follow the above steps in reverse order. In addition, the bearing unit (C) and the flange (D) need to be slid forward when reinstalling. When sliding forward, a reset traction member (5) is required. When reinstalling, the second threaded section (31) of the reset traction member (5) is threadedly connected to the front connection threaded blind hole of the machine base (A1) or the external connection threaded blind hole of the rotor bracket (B1). At this time, a nylon collar (54) is provided on the reset traction member (5). The nylon collar (54) on the reset traction member (5) is screwed into the reset traction member (5). ) is abutted against and pushed to push the bearing unit (C) or the flange (D) to slide forward. When it is screwed to the limit, the reset traction member (5) is removed and a nylon collar (54) is installed. Then, the second threaded section (31) of the reset traction member (5) is threadedly connected to the front connection threaded blind hole of the machine base (A1) or the external connection threaded blind hole of the rotor bracket (B1). The reset traction member (5) is further screwed. The two nylon collars (54) on the reset traction member (5) are abutted against and pushed to push the bearing unit (C) or the flange (D) to slide forward. Similarly, by adding nylon collars (54), the bearing unit (C) or the flange (D) is continuously slid forward until the bearing unit (C) or the flange (D) is reinstalled in place. Finally, the front connection bolts or the inner connection bolts and the outer connection bolts are installed to complete the reinstallation of the bearing unit (C) and the flange (D).

10. A method for disassembling and assembling a bearing unit of a semi-direct drive wind turbine generator according to claim 9, characterized in that: When only the rear bearing (C4) of the bearing unit (C) needs to be removed, remove the flange (D) according to the above steps 1), 2), and 3), wrap the heating tape of the medium frequency heater around the outer circumferential surface of the bearing seat (C1) corresponding to the rear bearing (C4), heat the bearing seat (C1) so that the bearing seat (C1) expands due to the heat and creates a gap with the outer ring of the rear bearing (C4), then use the bearing puller (4) to pull out the outer ring of the rear bearing (C4), and use the hand chain hoist (8) to lift the outer ring of the rear bearing (C4) to a suitable position; wrap the heating tape of the medium frequency heater around the rear bearing (C4) The inner ring outer circumference of the inner ring is removed, the inner ring of the rear bearing (C4) is heated to expand due to the heat to create a gap with the hollow shaft (C2), and then the inner ring of the rear bearing (C4) is pulled out with the bearing puller (4), and the inner ring of the rear bearing (C4) is lifted to a suitable position using a hand chain hoist (8). When reinstalling the rear bearing (C4) of the bearing unit (C), the inner ring of the rear bearing (C4) is first installed, and then the outer ring of the rear bearing (C4) is installed, and the copper rod is used for reinstallation. After the rear bearing (C4) is reinstalled, the flange (D) can be reinstalled according to the method of reinstalling the flange (D) in the above step 5).

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