Shafting structure of transmission chain main bearing, debugging method and pre-tightening maintenance method

Abstract

The invention relates to a transmission chain structure of a wind turbine generator, and discloses a shaft system structure of a transmission chain main bearing, which comprises a main bearing connected with a main shaft in an interference fit manner, a bearing seat connected with an outer ring of the main bearing in an interference fit manner, and a split connecting ring connected with a flange end face of the bearing seat, the upper connecting ring is made of transparent materials and formed by castings or forgings, the lower connecting ring is formed by castings or forgings, a main bearing pre-tightening end cover abuts against the end face of the main bearing, the main bearing pre-tightening end cover is formed by splicing at least three arc sections with the same outer side end face circumference, and all the arc sections are connected with the end face of the main shaft through bolt pairs. And the spigot of the pre-tightening end cover axially presses the inner ring of the main bearing, so that the axial pre-tightening of the main bearing is realized. The shaft system of the transmission chain main bearing is simple in structure, reliable operation of the main bearing can be better guaranteed, and the operation and maintenance cost of a unit is greatly reduced.

Description

Technical Field

[0001] The invention relates to a transmission chain structure of a wind turbine generator set, and in particular to a shaft system structure of a transmission chain main bearing, a debugging method of the transmission chain main bearing and a pre-tightening maintenance method of the transmission chain main bearing. Background Art

[0002] With the continuous development of the wind power industry, the layout of the wind turbine transmission system and the connection between the gearbox and the shaft system are constantly changing.

[0003] At present, the arrangement of the main bearings of the shaft system tends to be a single-row tapered roller bearing TRB + single-row tapered roller bearing TRB configuration, and the connection between the shaft system and the gearbox tends to be an integrated structure, that is, the bearing seat is connected to the first-stage gear ring of the gearbox, and the main shaft is connected to the first-stage planetary carrier of the gearbox. For the arrangement of the TRB main bearing structure, the preload control requirements for the main bearing are relatively high. For this integrated connection between the gearbox and the shaft system, the bearing preload end cover is enclosed in the internal cavity of the transmission system. Once the bearing preload is insufficient and needs to be adjusted or the preload end cover bolts are loose, it will be impossible to perform maintenance in time on the wind turbine equipment that has been installed in the sky, and the main bearing will run in circles, move, and fail. At the same time, since the main bearing lubrication method is oil injection lubrication, the injection point is enclosed in the inner cavity, and the internal oil injection lubrication situation cannot be intuitively seen.

[0004] In view of this, it is necessary to provide a shaft system structure in which the preload force of the main bearing of the transmission chain can be maintained, so as to solve or overcome the above-mentioned technical problems. Summary of the invention

[0005] The technical problem to be solved by the first aspect of the present invention is to provide a shaft system structure for a transmission chain main bearing, which can meet the main bearing lubrication test and main bearing pre-tightening maintenance requirements before installation and after the unit is launched into space. The main bearing pre-tightening maintenance can be achieved when the unit is in space, and the shaft system and gear box do not need to be lowered from the tower, which can ensure more reliable operation of the main bearing and reduce the maintenance cost of the unit.

[0006] The technical problem to be solved by the second aspect of the present invention is to provide a method for debugging a main bearing of a transmission chain, which can meet the main bearing lubrication test of the shaft system structure before installation and is easy to operate.

[0007] The technical problem to be solved by the third aspect of the present invention is to provide a pre-tightening maintenance method for the main bearing of the transmission chain. The pre-tightening maintenance method can meet the main bearing pre-tightening maintenance requirements of the shaft system structure, and the main bearing pre-tightening maintenance can be achieved when the unit is in the sky. The shaft system and the gear box do not need to be lowered from the tower, which can ensure more reliable operation of the main bearing and reduce the maintenance cost of the unit.

[0008] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0009] A shaft system structure of a transmission chain main bearing, comprising a main bearing connected to a main shaft by interference fit, a bearing seat connected to an outer ring of the main bearing by interference fit, and a split connecting ring connected to a flange end face of the bearing seat, the split connecting ring comprising a connecting lower ring and a connecting upper ring, the connecting upper ring can be selectively made of a transparent material, or formed by a casting or a forging, the connecting lower ring is formed by a casting or a forging, and the main bearing preload end cover is formed by splicing at least three arc segments with equal outer end face circumferences, and each arc segment is connected to the end face of the main shaft.

[0010] Preferably, the connecting lower ring includes a connecting lower ring body, and the connecting lower ring body is provided with a first arc flange at both ends of the axial direction, and a first transverse flange at both ends of the radial direction, and the first arc flange and the first transverse flange are both provided with connecting holes; and / or, the connecting upper ring includes a connecting upper ring body, and the connecting upper ring body is provided with a second arc flange at both ends of the axial direction, and a second transverse flange at both ends of the radial direction, and the second arc flange and the second transverse flange are both provided with connecting holes.

[0011] Preferably, a sealing groove is provided on the surface of the second transverse flange opposite to the first transverse flange, and a sealing strip is provided in each of the sealing grooves.

[0012] Preferably, the outer circumferential surfaces of the connecting lower ring body and the connecting upper ring body are further provided with hanging bosses, and the hanging bosses are both provided with hanging holes.

[0013] Preferably, a displacement sensor device is also provided on the main bearing preload end cover.

[0014] Preferably, an end cover gap (16) is provided between the arc segments of two adjacent main bearing preload end covers.

[0015] Preferably, one end of the split connecting ring away from the bearing seat is connected to the primary gear ring of the gear box.

[0016] Preferably, a second sealing structure is further provided between the split connecting ring and the bearing seat.

[0017] In addition, the present invention also proposes a method for debugging the shaft system structure of the main bearing of a transmission chain, which is applied to the shaft system structure of the main bearing of the transmission chain described in any one of the above technical solutions, and comprises the following steps:

[0018] Step S01, installing and connecting the upper connecting ring, the lower connecting ring, the main shaft, the main bearing, the bearing seat, the upper connecting ring, the first gear ring of the gear box, and the first gear planet carrier of the gear box, and selecting the upper connecting ring made of a transparent material;

[0019] Step S02, performing an oil injection lubrication test, rotating the main shaft, and observing the lubrication condition of the main bearing through the transparent upper connecting ring;

[0020] Step S03: After the oil injection lubrication test is completed, the upper connecting ring formed of the transparent material is replaced with the upper connecting ring formed of a casting or a forging.

[0021] Furthermore, the present invention also proposes a pre-tightening maintenance method for the shaft system structure of the main bearing of a transmission chain, which is applied to the shaft system structure of the main bearing of the transmission chain described in any one of the above technical solutions, and comprises the following steps:

[0022] Step S01, after receiving the detection signal of the displacement sensor device, remove the connecting ring;

[0023] Step S02, rotating the main shaft, rotating one of the arc segments of the main bearing preload end cover to the 12 o'clock position, and removing or adjusting the connecting bolt pair between the arc segment and the main shaft;

[0024] Step S03, repeating step S02, and sequentially removing or adjusting the connecting bolt pairs between other arc segments and the main shaft;

[0025] Step S04: installing the connecting ring.

[0026] Through the above technical scheme, the shaft system structure of the transmission chain main bearing of the present invention includes a main bearing connected to the main shaft by interference fit, a bearing seat connected to the outer ring of the main bearing by interference fit, and a split connecting ring connected to the flange end face of the bearing seat, the split connecting ring includes a connecting lower ring and a connecting upper ring, the connecting lower ring is located at the bottom, the connecting upper ring is located at the top, the connecting upper ring is formed by transparent materials, castings or forgings, and the connecting lower ring is formed by castings or forgings. The main bearing pre-tightening end cover is against the end face of the main bearing, and the stop of the main bearing pre-tightening end cover is pressed against the inner ring of the main bearing through the bearing pre-tightening end cover connecting bolt pair, so as to realize the axial pre-tightening of the main bearing. At the same time, the main bearing pre-tightening end cover is spliced ​​by at least three arc segments with equal circumference of the outer end face, and each arc segment is connected to the end face of the main shaft by a bolt pair. The shaft system structure of the main bearing of the transmission chain of the present invention can meet the visibility requirements of the main bearing lubrication test in the unit workshop and the pre-tightening maintenance requirements of the main bearing after going into space. The pre-tightening of the main bearing can be maintained when the unit is in space, and the shaft system and gear box do not need to be lowered from the tower, which can ensure more reliable operation of the main bearing and low maintenance costs for the unit.

[0027] Other advantages of the present invention and the technical effects of the preferred embodiments will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1It is a structural schematic diagram of a specific embodiment of the shaft system structure of the main bearing of the transmission chain according to the present invention;

[0029] Figure 2 yes Figure 1 A partial enlarged schematic diagram of

[0030] Figure 3 It is one of the three-dimensional structural schematic diagrams of a specific embodiment of the shaft system structure of the main bearing of the transmission chain according to the present invention;

[0031] Figure 4 yes Figure 3 A partial enlarged schematic diagram of

[0032] Figure 5 This is a second three-dimensional structural schematic diagram of a specific embodiment of the shaft system structure of the main bearing of the transmission chain according to the present invention;

[0033] Figure 6 It is a schematic diagram of a specific embodiment of the shaft system structure of the main bearing of the transmission chain of the present invention;

[0034] Figure 7 yes Figure 6 A partial enlarged schematic diagram of

[0035] Figure 8 It is a flow chart of a method for debugging the shaft system structure of a main bearing of a transmission chain according to the present invention;

[0036] Fig. 9 It is a flow chart of the pre-tightening maintenance method of the shaft system structure of the main bearing of the transmission chain described in the present invention.

[0037] Description of Reference Numerals

[0038] 1 Connect the lower ring 101 Connect the lower ring body

[0039] 102 first arc-shaped flange 103 first transverse flange

[0040] 2 Main shaft 3 Main bearing

[0041] 4 Bearing seat 5 Bearing seat connecting bolt pair

[0042] 6 Connect the upper ring 601 Connect the upper ring body

[0043] 602 second arc flange 603 second transverse flange

[0044] 604 lifting boss 7 gear ring connecting bolt pair

[0045] 8 Gearbox first stage ring gear 9 Gearbox first stage planetary carrier

[0046] 10O-type sealing ring 11Main bearing preload end cover

[0047] 1101 end cover lifting hole 12 bearing preload end cover connecting bolt pair

[0048] 13O-type sealing ring 14 connecting ring connecting bolt pair

[0049] 15 Sealing strip 16 End cover gap DETAILED DESCRIPTION

[0050] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0051] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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 direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0053] like Figures 1 to 7 As shown, the present invention provides a shaft system structure of a transmission chain main bearing, comprising a main bearing 3 connected to a main shaft 2 by interference fit, a bearing seat 4 connected to an outer ring of the main bearing 3 by interference fit, and a split connecting ring connected to a flange end face of the bearing seat 4, the split connecting ring comprising a connecting lower ring 1 and a connecting upper ring 6, the connecting upper ring 6 can selectively be made of a transparent material, or formed by a casting or a forging, the connecting lower ring 1 is formed by a casting or a forging, and the main bearing preload end cover 11 is formed by splicing at least three arc segments with equal outer end face circumferences, and each arc segment is connected to the end face of the main shaft 2.

[0054] In the present invention, the inner ring of the main bearing 3 is connected with the main shaft 2 by interference fit, the outer ring of the main bearing 3 is connected with the bearing seat 4 by interference fit, the main bearing preload cover 11 is pressed against the inner ring end face of the main bearing 3, and is connected to the end of the main shaft 2 by the bearing preload cover connection bolt pair 12, and the stop of the main bearing preload cover 11 is pressed against the inner ring of the main bearing 3 by the bearing preload cover connection bolt pair 12, so as to realize the axial preload of the main bearing 3. The bearing seat 4 is connected with the split connection ring by the bearing seat connection bolt pair 5, and the other end of the split connection ring is connected with the gear box primary ring 8 by the gear ring connection bolt pair 7, the gear box primary planet carrier 9 is pressed against the end of the main shaft 2, the gear box primary planet carrier 9 and the main shaft 2 are connected by the bolt pair, and an O-type sealing ring 13 is provided between the gear box planet carrier 9 and the main shaft 2, so as to constitute the main structure of the shaft system structure of the transmission chain main bearing of the present invention.

[0055] It can be seen that in the above basic structure, the split connecting ring includes a connecting lower ring 1 and a connecting upper ring 6, and the connecting lower ring 1 and the connecting upper ring 6 are connected by a connecting ring connecting bolt pair 14, and the connecting lower ring 1 and the connecting upper ring 6 are connected to the bearing seat 4 by a bearing seat connecting bolt pair 5. At the same time, the main bearing preload end cover 11 includes at least three arc segments with equal circumferences of the outer end faces, that is, the main bearing preload end cover 11 is spliced ​​by at least three congruent arc segments, so that the main bearing preload end cover 11 can be moved to a suitable position and disassembled and installed by rotating the main shaft 2. The arc segment splicing structure can improve the utilization rate of workshop scraps and reduce production costs. Each arc end cover is also provided with a hoisting hole for hoisting and disassembly and maintenance.

[0056] During the processing, the split connecting ring at the 12 o'clock position above (i.e., the connecting upper ring 6) can be made of a transparent material, such as acrylic, or can be formed by casting or forging, depending on the actual use requirements. Specifically, when the shaft system structure of the main bearing 3 of the transmission chain of the present invention is assembled in a workshop or on a test bench, when it is necessary to observe the oil injection lubrication of the main bearing 3, since the connecting upper ring 6 is installed in the upper half, the connecting upper ring 6 can be formed of transparent acrylic, which can not only complete the structural installation, but also observe the use of each component during the test and the lubrication of the main bearing 3, to ensure the reliable operation of the main bearing.

[0057] In addition, when it is necessary to install the shaft system structure of the transmission chain main bearing of the present invention on the fan, the connecting upper ring 6 made of transparent material can be replaced with a connecting upper ring 6 made of a casting or a forging. Since the two ends of the connecting lower ring 1 are respectively connected to the bearing seat 4 and the first-stage gear ring 8 of the gear box, after the connecting upper ring 6 is disassembled, the relative positions of the various components do not change, and the bearing pre-tightening end cover connecting bolt pair 12 can be inspected for operation and maintenance and the main bearing pre-tightening end cover 11 can be replaced.

[0058] During the operation of the unit, once the bearing preload cover connection bolt pair 12 becomes loose or the preload force of the main bearing 3 needs to be adjusted and the preload cover needs to be replaced, the maintenance personnel do not need to completely disassemble the gearbox and the shaft system, nor do they need to lower the gearbox. They only need to remove the upper connection ring 6 located above and rotate the main shaft 2, which can greatly reduce the maintenance cost. Specifically, Figures 3 to 5 As shown, the main shaft 2 is rotated, and the arc segment of the main bearing preload cover 11 that needs to be maintained is turned to a suitable position, and the bearing preload cover connecting bolt pair 12 is maintained, and then the main shaft 2 is rotated again, and the remaining arc segment end covers are rotated to a suitable position in turn, and the bearing preload cover connecting bolt pair 12 is maintained. If the preload force of the main bearing 3 needs to be adjusted and the main bearing preload cover 11 needs to be replaced, the arc segments of the main bearing preload cover 11 that needs to be removed can be rotated to a suitable position by rotating the main shaft 2, and the arc segments of the new main bearing preload cover 11 can be removed and installed in turn. It should be noted that the number of split parts of the split connection ring of the present invention must be less than the number of arc segments of the main bearing preload cover 11, that is, the number of split parts of the split connection ring is two, and the number of arc segments of the main bearing preload cover 11 is set to at least three, and can also be four, or even more. In this way, when removing a small number of arc segments of the main bearing preload cover 11, the disassembled arc segments can be smoothly removed, and the main bearing 3 can also be removed when needed. If the number of the main bearing preload end cover 11 and the split connecting ring is set to other relationships, the effect of the present invention may not be achieved.

[0059] As a preferred embodiment of the present invention, the connecting lower ring 1 includes a connecting lower ring body 101, and the connecting lower ring body 101 is provided with first arc flanges 102 at both ends in the axial direction and first transverse flanges 103 at both ends in the radial direction, and the first arc flange 102 and the first transverse flange 103 are both provided with connecting holes.

[0060] As a preferred embodiment of the present invention, the connecting upper ring 6 includes a connecting upper ring body 601, and second arc flanges 602 are provided at both ends of the connecting upper ring body 601 in the axial direction, and second transverse flanges 603 are provided at both ends in the radial direction, and connecting holes are provided on the second arc flange 602 and the second transverse flange 603.

[0061] In a specific embodiment of the present invention, Figure 5 As shown, a first arc-shaped flange 102 is provided at both ends of the axial direction of the connecting lower ring 1, and a second arc-shaped flange 602 is provided at both ends of the axial direction of the connecting upper ring 6. The outer diameters of the first arc-shaped flange 102 and the second arc-shaped flange 602 are equal, so that when the connecting lower ring 1 and the connecting upper ring 6 are connected to form a split connecting ring, the flanges at both ends of the split connecting ring can basically overlap.

[0062] In addition, the flange on the bearing seat connected to the split connecting ring directly increases the wall thickness of the outer ring of the main bearing 3, reducing the problem of the increase in the weight of the bearing seat 4 caused by the increase in the wall thickness of the bearing seat required for the installation of the main bearing 3. Since the installation of the main shaft where the inner ring of the main bearing 3 is located is connected to the first-level planetary carrier 9 of the gear box, the installation wall thickness of the main shaft and the inner ring of the bearing is relatively thick, while the flange on the bearing seat 4 connected to the split connecting ring effectively ensures the uniformity of the wall thickness of the inner and outer rings of the main bearing 3, so that the inner and outer rings of the bearing have better stiffness matching, the shaft system deformation is small, the meshing of the gear box teeth is more reliable, and the reliability of the entire transmission chain is effectively improved.

[0063] As a preferred embodiment of the present invention, a sealing groove is provided on the surface of the second transverse flange edge 603 opposite to the first transverse flange edge 103, and a sealing strip 15 is provided in each of the sealing grooves.

[0064] In a specific embodiment of the present invention, sealing grooves are arranged in parallel and at equal intervals on the second transverse flange edge 603, and sealing strips are arranged in the sealing grooves to achieve sealing of the end face connection between the lower ring 1 and the upper ring 6 to prevent leakage of lubricating oil in the gear box and the shaft system cavity.

[0065] As a preferred embodiment of the present invention, the outer circumferential surfaces of the connecting lower ring body 101 and the connecting upper ring body 601 are further provided with hanging bosses 604 , and the hanging bosses 604 are both provided with hanging holes.

[0066] In a specific embodiment of the present invention, Figure 5 As shown, according to the lifting requirements, the lifting bosses 604 are symmetrically arranged on the outer circumference of the lower ring body 101, and the lifting bosses 604 are also symmetrically arranged on the outer circumference of the upper ring body 601. Preferably, each of the lifting bosses 604 is provided with a lifting hole.

[0067] As a preferred embodiment of the present invention, a displacement sensor device is also provided on the main bearing preload end cover 11 .

[0068] In a specific embodiment of the present invention, a displacement sensor device is provided on the main bearing preload cover 11, so that the axial movement and radial movement of the main bearing preload cover 11 can be monitored in real time after the shaft system structure of the transmission chain main bearing of the present invention is installed on the wind turbine.

[0069] As a preferred embodiment of the present invention, an end cover gap 16 is provided between arc segments of two adjacent main bearing preload end covers 11 .

[0070] In a specific embodiment of the present invention, Figure 7As shown, an end cover gap 16 is provided between the ends of the two arc segments to prevent the circumferential installation from being difficult or impossible due to machining and cumulative dimensional tolerances.

[0071] As a preferred embodiment of the present invention, one end of the split connecting ring away from the bearing seat 4 is connected to the first-stage gear ring 8 of the gear box.

[0072] As a preferred embodiment of the present invention, an O-ring 10 is further provided between the split connecting ring and the bearing seat 4 .

[0073] As an optimal embodiment of the shaft system structure of the transmission chain main bearing of the present invention, it includes a main shaft 2, a main bearing 3, a bearing seat 4, a split connecting ring, a first-stage gear ring 8 of a gear box, a first-stage planetary carrier 9 of a gear box and a main bearing pre-tightening end cover 11, wherein the inner ring of the main bearing 3 is connected to the outer diameter surface of the main shaft 2 by interference, the outer ring of the main bearing 3 is interference connected with the inner hole of the bearing seat 4, the main bearing pre-tightening end cover 11 is connected to the main shaft 2 by a bearing pre-tightening end cover connecting bolt pair 12, and the main bearing pre-tightening end cover 11 abuts on the inner ring end surface of the main bearing 3, the bearing seat 4 is connected to the split connecting ring by a bearing seat connecting bolt pair 5, an O-ring 10 is provided on the connecting end surface of the bearing seat 4 and the split connecting ring, the other end of the split connecting ring is connected to the first-stage gear ring 8 of the gear box by a gear ring connecting bolt pair 7, the gear box planetary carrier 9 abuts on the end of the main shaft 2, and the gear box planetary carrier 9 and the main shaft 2 are connected by the bearing pre-tightening end cover connecting bolt pair 12. The split connecting ring includes a connecting lower ring 1 and a connecting upper ring 6. The connecting upper ring 6 is formed by transparent material, casting or forging. The connecting lower ring 1 is formed by casting or forging. The connecting lower ring 1 includes a connecting lower ring body 101, a first arc flange 102 arranged at both ends of the connecting lower ring body 101 in the axial direction, and a first transverse flange 103 arranged at both ends of the connecting lower ring body 101 in the radial direction. The first arc flange 102 and the first transverse flange 103 are both provided with connecting holes. The connecting upper ring 6 includes a connecting upper ring body 601, a second arc flange 602 arranged at both ends of the connecting upper ring body 601 in the axial direction, and a second transverse flange 603 arranged at both ends of the connecting upper ring body 601 in the radial direction. The second arc flange 602 and the second transverse flange 603 are both provided with connecting holes. The first transverse flange 103 is provided with a sealing groove, and a sealing strip 15 is provided in the sealing groove. The connecting lower ring 1 and the connecting upper ring 6 are connected by a connecting ring connecting bolt pair 14. The main bearing preload end cover 11 is formed by splicing at least three congruent arc segments, and an end cover gap 16 is provided between the arc segments of two adjacent main bearing preload end covers 11. A displacement sensor device is also provided on the main bearing preload end cover 11.

[0074] Based on the above preferred embodiment, it can be seen that the use process of the shaft system structure of the transmission chain main bearing of the present invention is as follows:

[0075] During the testing phase, the upper connecting ring 6 formed of a transparent material can be used to observe the oil injection lubrication condition of the main bearing in a workshop or on a test bench.

[0076] During the use stage, the upper connecting ring 6 formed of transparent material after the test is completed is replaced with a commonly used upper connecting ring 6 formed of a casting or a forging, and then it can be installed on the wind turbine.

[0077] During the operation and maintenance phase of the unit, through the displacement sensor device, if the connection of the bearing preload cover connecting bolt pair 12 becomes loose and needs to be adjusted, or when the unit is regularly operated and inspected, first remove the upper connecting ring 6, and connect the lower connecting ring 1 between the bearing seat 4 and the gear box ring 8 to ensure that the installation position of each component remains unchanged. It is only necessary to rotate the main shaft 2, and rotate the arc segments of the main bearing preload cover 11 that need to be adjusted to the top in turn, and perform the preload maintenance and adjustment of the bearing preload cover connecting bolt pair 12. If the preload force of the main bearing 3 is not appropriate and the main bearing preload cover 11 needs to be replaced, rotate the main shaft 2, rotate the arc segments of the main bearing preload cover 11 to the appropriate position, and remove and install the new arc segments of the main bearing preload cover 11 in turn.

[0078] It can be seen from this that the present invention can not only realize test observation, but also can maintain the bearing pretightening end cover connecting bolt pair 12 during operation and replace the new main bearing pretightening end cover 11 without the need for the gear box and the shaft system structure to be completely disassembled and separated, and without the shaft system structure and the gear box lower tower. The operator only needs to remove the connecting ring 6 on the tower to perform various operations on the main bearing 3 and the main bearing pretightening end cover 11, which effectively reduces the difficulty of operation and greatly reduces the maintenance cost.

[0079] In addition, if Figure 8 As shown, the present invention further provides a method for debugging the shaft system structure of the main bearing of a transmission chain, which is applied to the shaft system structure of the main bearing of the transmission chain in any one of the above technical solutions, and comprises the following steps:

[0080] Step S01, installing and connecting the upper connecting ring 6, the lower connecting ring 1, the main shaft 2, the main bearing 3, the bearing seat 4, the upper connecting ring 6, the first gear ring 8 of the gear box, and the first gear planet carrier 9, and selecting the upper connecting ring 6 made of a transparent material;

[0081] Step S02, performing an oil injection lubrication test, rotating the main shaft 2, and observing the lubrication condition of the main bearing 3 through the transparent connecting upper ring 6;

[0082] Step S03: After the oil injection lubrication test is completed, the upper connecting ring 6 formed of a transparent material is replaced with the upper connecting ring 6 formed of a casting or a forging.

[0083] The debugging method of the shaft system structure of the main bearing of the transmission chain of the present invention is used in the debugging stage of the shaft system structure, and can realize the main bearing lubrication test observation in the assembly stage. Specifically, after the assembly of each component is completed, the connecting upper ring 6 formed of a transparent material is installed to facilitate the observation of the lubrication condition of the main bearing 3 and the installation condition of other components. After the lubrication test is completed, the connecting upper ring 6 made of the transparent material is removed and replaced with the connecting upper ring 6 made of a casting or forging material, and the next step of the unit installation can be carried out.

[0084] Furthermore, if Fig. 9 As shown, the present invention also provides a pre-tightening maintenance method for the shaft system structure of the main bearing of the transmission chain, which is applied to the shaft system structure of the main bearing of the transmission chain in any one of the above technical solutions, and comprises the following steps:

[0085] Step S01, after receiving the detection signal of the displacement sensor device, remove the connecting ring 6;

[0086] Step S02, rotating the main shaft 2, rotating one of the arc segments of the main bearing preload end cover 11 to the 12 o'clock position, and removing or adjusting the connecting bolt pair 12 between the arc segment and the main shaft;

[0087] Step S03, repeating step S02, and sequentially removing or adjusting the connecting bolt pairs 12 between other arc segments and the main shaft;

[0088] Step S04, installing the connecting upper ring 6.

[0089] When the unit is in the sky, the existing pre-tightening maintenance requires the unit to be disassembled for maintenance. In the pre-tightening maintenance method of the shaft system structure of the transmission chain main bearing of the present invention, since the connecting upper ring 6 and the connecting lower ring 1 are split structures, when the connecting upper ring 6 is removed, the connecting lower ring 1 is still connected between the bearing seat 4 and the first gear ring 8 of the gear box, and the two are limitedly connected. Therefore, the main bearing 3 can be pre-tightened directly on the unit for maintenance, and the shaft system and gear box do not need to be lowered. At the same time, since all important parts are not disassembled, there is no need to calibrate the installation status of each part again after the pre-tightening maintenance, which can effectively ensure the reliability of the operation of the main bearing 3, and the working process is very simple, which reduces the labor intensity of the operators and greatly reduces the maintenance cost of the unit.

[0090] In summary, the present invention can achieve the following two important effects:

[0091] First, the shaft system structure of the present invention can realize the pre-tightening and maintainability of the main bearing 3. Once the bolt pair becomes loose or the pre-tightening force needs to be adjusted, there is no need to completely disassemble and separate the gear box and the shaft system structure, nor is there a need to lower the gear box tower. Maintenance personnel only need to disassemble the connecting upper ring 6 and rotate the main shaft 2, which greatly reduces the difficulty of the operation and reduces the maintenance cost.

[0092] Second, according to the test requirements, the connecting ring 6 is formed of a transparent acrylic material, which can meet the requirements of real-time observation and testing of the oil injection lubrication condition of the main bearing 3 during the test phase.

[0093] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0094] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0095] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A shaft system structure of a transmission chain main bearing, characterized in that: The invention comprises a main bearing (3) connected to a main shaft (2) by interference fit, a bearing seat (4) connected to the outer ring of the main bearing (3) by interference fit, and a split connecting ring connected to the flange end face of the bearing seat (4), wherein the split connecting ring comprises a connecting lower ring (1) and a connecting upper ring (6), wherein the connecting upper ring (6) can be selectively made of a transparent material, or formed by a casting or a forging, and the connecting lower ring (1) is formed by a casting or a forging, and the main bearing preload end cover (11) is formed by splicing at least three arc segments with equal outer end face circumferences, and each arc segment is connected to the end face of the main shaft (2).

2. The shaft system structure of the transmission chain main bearing according to claim 1 is characterized in that: The connecting lower ring (1) comprises a connecting lower ring body (101), wherein the two ends of the connecting lower ring body (101) in the axial direction are provided with first arc-shaped flanges (102), and the two ends of the connecting lower ring body (101) in the radial direction are provided with first transverse flanges (103), and the first arc-shaped flange (102) and the first transverse flange (103) are both provided with connecting holes; and / or, the connecting upper ring (6) comprises a connecting upper ring body (601), wherein the two ends of the connecting upper ring body (601) in the axial direction are provided with second arc-shaped flanges (602), and the two ends of the connecting upper ring body (601) in the radial direction are provided with second transverse flanges (603), and the second arc-shaped flange (602) and the second transverse flange (603) are both provided with connecting holes.

3. The shaft system structure of the transmission chain main bearing according to claim 2 is characterized in that: A sealing groove is provided on the surface of the second transverse flange (603) opposite to the first transverse flange (103), and a sealing strip (15) is provided in each of the sealing grooves.

4. The shaft system structure of the transmission chain main bearing according to claim 3 is characterized in that: A lifting boss (604) is also provided on the outer circumferential surface of the connecting lower ring body (101) and the connecting upper ring body (601), and a lifting hole is provided on the lifting boss (604).

5. The shaft system structure of the main bearing of the transmission chain according to any one of claims 1 to 4, characterized in that: The main bearing preload end cover (11) is also provided with a displacement sensor device.

6. The shaft system structure of the main bearing of the transmission chain according to any one of claims 1 to 4, characterized in that: An end cover gap (16) is provided between the arc segments of two adjacent main bearing preload end covers (11).

7. The shaft system structure of the main bearing of the transmission chain according to any one of claims 1 to 4, characterized in that: One end of the split connecting ring away from the bearing seat (4) is connected to the first-stage gear ring (8) of the gear box.

8. The shaft system structure of the main bearing of the transmission chain according to any one of claims 1 to 4, characterized in that: A second sealing structure (10) is also provided between the split connecting ring and the bearing seat (4).

9. A method for debugging a shaft system structure of a transmission chain main bearing, applied to the shaft system structure of a transmission chain main bearing according to any one of claims 1 to 8, characterized in that: The steps include: Step S01, installing and connecting the upper connecting ring (6), the lower connecting ring (1), the main shaft (2), the main bearing (3), the bearing seat (4), the upper connecting ring (6), the first gear ring (8) of the gear box, and the first gear planet carrier (9) of the gear box, and selecting the upper connecting ring (6) made of a transparent material; Step S02, performing an oil injection lubrication test, rotating the main shaft (2), and observing the lubrication condition of the main bearing (3) through the transparent connecting upper ring (6); Step S03: After the oil injection lubrication test is completed, the connecting upper ring (6) formed of a transparent material is replaced with the connecting upper ring (6) formed of a casting or a forging.

10. A pre-tightening maintenance method for a shaft system structure of a transmission chain main bearing, applied to the shaft system structure of a transmission chain main bearing according to any one of claims 1 to 8, characterized in that: The steps include: Step S01, after receiving the detection signal from the displacement sensor device, remove the connecting ring (6); Step S02, rotating the main shaft (2), rotating one of the arc segments of the main bearing preload end cover (11) to the 12 o'clock position, and removing or adjusting the connecting bolt pair (12) between the arc segment and the main shaft; Step S03, repeating step S02, and sequentially removing or adjusting the connecting bolt pairs (12) between other arc segments and the main shaft; Step S04, installing the connecting ring (6).

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