A differential bolt assembly for hydraulic turning and a steam turbine rotor maintenance device

Abstract

The present invention provides a differential bolt assembly for hydraulic winching and a turbine rotor maintenance device, which are used to connect the rotor rear axle head and the hydraulic winching drive device. The differential bolt assembly for hydraulic winching includes a bolt and a one-way bearing; the bolt is used to be rigidly connected to the rotor rear axle head; the inner sleeve of the one-way bearing is coaxially fixedly connected to the bolt, and the outer sleeve of the one-way bearing is used to be coaxially fixedly connected to the hydraulic winching drive device; when the hydraulic winching drive device drives the rotor rear axle head to rotate, the one-way bearing is in a locked state. The present invention effectively solves the problem of the bolt and the rotor rear axle head thread biting during the winching deceleration process during the general assembly and maintenance of the gas turbine by unidirectional force on the thread and unidirectional torque transmission of the one-way bearing, reduces the wear of the threads on the winching equipment and the rotor, reduces the maintenance cost of the maintenance equipment and the rotor, and saves manpower and material costs.

Description

Technical Field

[0001] The invention belongs to the field of maintenance equipment and mechanical transmission, and particularly relates to a differential bolt assembly for a hydraulic turning machine and a steam turbine rotor maintenance device. Background Art

[0002] The gas turbine rotor is not put into operation for a long time, which causes the rotor to deform flexibly. Before the formal operation of the gas turbine and during maintenance, the cranking gear must be used to drive the gas turbine rotor to rotate at a low speed to eliminate the flexible deformation of the gas turbine rotor. In traditional hydraulic winching, the hydraulic winching gear used for gas turbine maintenance is rigidly connected to the gas turbine rotor through the bolts on the winching gear and the threaded holes on the turbine end of the rotor, and the bolts are screwed into the center threaded holes of the rear axle head that transmit torque; during the winching speed-up process, the bolts rotate with the hydraulically driven winching gear, and the rotor is driven to rotate by the torque transmitted through the threads. When the winching gear reaches the set speed and rotates at a fixed speed, the rotor also rotates at a certain speed; when the winching gear slows down, since the rotor speed is higher than the winching gear speed, the winching gear rotates in the opposite direction to the rotor. At this time, the bolts will loosen from the threaded holes of the rear axle head. Since the entire winching gear is fixed on the turbine bearing housing, there is no space for the bolts to withdraw, which causes the bolts and the winching gear threads to bite, affecting the rotation of the rotor and damaging the winching gear device and the rotor rear axle head threads; in order to avoid the sticking phenomenon, the bolts need to be manually tightened again, which poses a certain danger to the staff. Summary of the Invention

[0003] In view of the shortcomings of the prior art mentioned above, the technical problem to be solved by the present invention is to provide a differential bolt assembly for hydraulic turning and a turbine rotor maintenance device, which effectively solves the problem of the bolts and the rotor rear shaft head threads being stuck during the turning and deceleration process during the general assembly and maintenance of the gas turbine, and reduces the wear of the threads on the turning equipment and the rotor.

[0004] To achieve the above-mentioned objectives, the present invention provides a differential bolt assembly for a hydraulic winch, which is used to connect the rear axle head of the rotor and the driving device of the hydraulic winch. The differential bolt assembly for the hydraulic winch includes a bolt and a one-way bearing; the bolt is used to be rigidly connected to the rear axle head of the rotor; the inner sleeve of the one-way bearing is coaxially fixedly connected to the bolt, and the outer sleeve of the one-way bearing is used to be coaxially fixedly connected to the driving device of the hydraulic winch; when the driving device of the hydraulic winch drives the rear axle head of the rotor to rotate, the one-way bearing is in a locked state.

[0005] Furthermore, the differential bolt assembly for the hydraulic turning gear further comprises a coupling, and the outer sleeve of the one-way bearing is fixedly connected to the driving device of the hydraulic turning gear via the coupling.

[0006] Furthermore, the inner sleeve of the one-way bearing and the bolt are fixedly connected by a plurality of first fixing bolts, and the outer sleeve of the one-way bearing and the coupling are fixedly connected by a plurality of second fixing bolts.

[0007] The present invention also provides a steam turbine rotor maintenance device, comprising a rotor rear axle head and a hydraulic turning drive device, and a differential bolt assembly for the hydraulic turning drive, wherein the bolt and the rotor rear axle head are rigidly connected, and the outer sleeve of the one-way bearing and the hydraulic turning drive device are coaxially fixedly connected.

[0008] Furthermore, the turbine rotor maintenance device also includes a positioning plate and an axial positioning assembly for axially fixing the positioning plate and fixedly arranged; the positioning plate is fixed to the rear shaft head of the rotor, and a positioning center hole is opened in the positioning plate to cooperate with the bolt positioning.

[0009] Preferably, the axial positioning assembly includes a first fixed bracket, a U-shaped tube fixed on the first fixed bracket, and a first horizontally movable positioning rod and a second horizontally movable positioning rod both movably assembled in the U-shaped tube; the positioning plate is clamped between the first horizontally movable positioning rod and the second horizontally movable positioning rod.

[0010] Furthermore, the steam turbine rotor maintenance device further includes a fixed second fixing bracket and an oil receiving box fixed on the second fixing bracket, wherein the oil receiving box is used to lubricate the positioning plate.

[0011] Furthermore, the steam turbine rotor maintenance device also includes a fixed third fixing bracket, and the driving device is installed on the third fixing bracket.

[0012] Preferably, the driving device is a hydraulic driving device, a motor driving device, or a manual driving device.

[0013] As described above, the differential bolt assembly for a hydraulic turning machine and the steam turbine rotor maintenance device according to the present invention have the following beneficial effects:

[0014] The present invention effectively solves the problem of the bolts and the rotor rear shaft head threads being stuck together during the cranking and deceleration process of the gas turbine during general assembly and maintenance by means of the unidirectional force of the bolts and the unidirectional torque transmission of the unidirectional bearings, thereby reducing the wear of the threads on the cranking equipment and the rotor, lowering the maintenance costs of the maintenance equipment and the rotor, and saving manpower and material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of a steam turbine rotor maintenance device according to the present invention;

[0016] Figure 2 It is a schematic structural diagram of the differential bolt assembly for the hydraulic disc brake of the present invention.

[0017] Description of Reference Numerals

[0018] 1 Rotor rear axle head

[0019] 2 Drive unit

[0020] 21 Third fixing bracket

[0021] 3 bolts

[0022] 4 One-way bearings

[0023] 41 inner sleeve

[0024] 42 coat

[0025] 43 First fixing bolt

[0026] 44 Second fixing bolt

[0027] 5 Positioning plate

[0028] 6 Axial positioning assembly

[0029] 61 First fixing bracket

[0030] 62 U-tube

[0031] 63 First moving positioning rod

[0032] 64 Second moving positioning rod

[0033] 7 Oil collection box

[0034] 71 Second fixing bracket

[0035] 8 Coupling

[0036] 9 Turbine bearing housing

[0037] 10 Differential bolt assembly for hydraulic disc brake DETAILED DESCRIPTION

[0038] The following is a further detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0042] like Figure 1 and Figure 2 As shown, the present application provides a hydraulic turning differential bolt assembly 10 for connecting the rotor rear shaft head 1 of the rotor and the driving device 2 of the hydraulic turning, which eliminates the flexible deformation of the rotor by allowing the rotor to rotate at a low speed. In this embodiment, as shown in FIG. Figure 1 and Figure 2 As shown, the hydraulic disc brake differential bolt assembly 10 includes a bolt 3 and a one-way bearing 4; wherein the bolt 3 is rigidly connected to the rear shaft head 1 of the rotor; Figure 2 As shown, the inner sleeve 41 of the one-way bearing 4 is coaxially fixedly connected to the bolt 3, and the outer sleeve 42 of the one-way bearing 4 is coaxially fixedly connected to the drive unit 2 of the hydraulic winch. Since the one-way bearing 4 has the characteristic of unidirectional torque transmission, the present application combines the unidirectional force of the bolt 3 with the unidirectional locking of the one-way bearing 4 to form a differential bolt assembly 10 for hydraulic winch, which can transmit torque in one direction and the bolt 3 can rotate freely with the rotor in the other direction. Therefore, when the drive unit 2 of the hydraulic winch drives the rear shaft head 1 to rotate, the one-way bearing 4 is in a locked state; the drive unit 2 of the hydraulic winch is a rotatable drive shaft structure.

[0043] In addition, if Figure 2As shown, the differential bolt assembly 10 for a hydraulic turning machine further includes a coupling 8, which securely connects the outer sleeve 42 of the one-way bearing 4 to the drive unit 2 of the hydraulic turning machine via the coupling 8. In this example, the coupling 8 not only accommodates installation errors between the drive unit 2 and the one-way bearing 4, but also absorbs shock and vibration generated by the drive unit 2, thereby improving overall stability.

[0044] like Figure 2 As shown, the inner sleeve 41 of the one-way bearing 4 is fixedly connected to the bolt 3 via a plurality of first fixing bolts 43, and the outer sleeve 42 of the one-way bearing 4 is fixedly connected to the coupling 8 via a plurality of second fixing bolts 44. In this embodiment, the inner sleeve 41 of the one-way bearing 4 is fixedly connected to the bolt 3 via the first fixing bolts 43, and the outer sleeve 42 of the one-way bearing 4 is fixedly connected to the coupling 8 via the second fixing bolts 44, which facilitates disassembly and maintenance.

[0045] like Figure 1 As shown, the present invention also provides a steam turbine rotor repair device, including a rotor rear shaft head 1 and a hydraulic turning drive device 2, and the above-mentioned hydraulic turning differential bolt assembly 10, the bolt 3 is rigidly connected to the rotor rear shaft head 1, the outer sleeve 42 of the one-way bearing 4 and the hydraulic turning drive device 2 are coaxially fixedly connected, and the two are preferably fixedly connected by a coupling 8. When the hydraulic turning drive device 2 rotates, it can drive the rotor rear shaft head 1 to rotate.

[0046] Based on this, when the speed of the hydraulic winch drive device 2 is in the process of increasing speed, the hydraulic winch drive device 2 drives the outer sleeve 42 of the one-way bearing 4 to rotate forward through the coupling 8. At this time, the inner sleeve 41 and the outer sleeve 42 of the one-way bearing 4 are in a locked state, and the inner sleeve 41 of the one-way bearing 4 rotates in the same direction as the outer sleeve 42. The inner sleeve 41 of the one-way bearing 4 drives the bolt 3 to rotate forward. The bolt 3 is threadedly connected to the rear shaft head 1 of the rotor, thereby driving the rotor to rotate with the hydraulic winch drive device 2; when the speed of the hydraulic winch drive device 2 reaches the set speed, the drive device 2 rotates at a fixed speed. When the hydraulic winch is turned on, the rotor also rotates at a certain speed, which is convenient for the maintenance of the unit, the measurement of the runout, etc. When the maintenance is completed, the speed of the hydraulic winch drive device 2 gradually slows down or stops, so that the speed of the rotor is faster than the speed of the drive device 2. On the contrary, the drive device 2 rotates in the opposite direction relative to the rotor. At this time, the inner sleeve 41 and the outer sleeve 42 of the one-way bearing 4 are in a free state, that is, the drive device 2 and the outer sleeve 42 of the one-way bearing 4 are in a state of the same speed. The rotor is in free rotation with the bolt 3 and the inner sleeve 41 of the one-way bearing 4, and the rotor is decelerated or stopped by its own resistance. Based on the characteristic of the one-way bearing 4 that transmits torque in one direction, this application avoids the risk of the bolt 3 loosening in the threaded hole of the rotor rear shaft head 1.

[0047] Since the rotor is prone to movement during rotation, the turbine rotor repair device further includes a positioning plate 5 and an axial positioning component 6 for axially fixing the positioning plate 5 and fixedly arranged. Figure 1 As shown. The positioning plate 5 is fixed on the rotor rear shaft head 1, and a positioning center hole is provided in the positioning plate 5 for positioning with the bolt 3. In this embodiment, the positioning plate 5 is fixedly connected to the rotor rear shaft head 1 by the bolt 3, so that the bolt 3, the positioning plate 5 and the rotor rear shaft head 1 are coaxially arranged. In this application, the axial positioning assembly 6 is used to fix the positioning plate 5 in a specific position. On the one hand, it prevents the rotor from moving during rotation. On the other hand, it reduces the wear on the rotor rear shaft head 1 by wearing the positioning plate 5, thereby reducing the maintenance cost of the inspection equipment and the rotor. Furthermore, the axial positioning assembly 6 includes a first fixed bracket 61, a U-shaped tube 62 fixed on the first fixed bracket 61, and a first horizontal movable positioning rod 63 and a second horizontal movable positioning rod 64, both of which are movably assembled in the U-shaped tube 62; the positioning plate 5 is clamped between the first horizontal movable positioning rod 63 and the second horizontal movable positioning rod 64. In this embodiment, by adjusting the positions of the first and second horizontally movable positioning rods 63 and 64, the position of the positioning plate 5 is changed, thereby changing the axial position of the rotor, facilitating runout measurement. The first and second horizontally movable positioning rods 63 and 64 clamp the positioning plate 5, ensuring that the rotor always rotates in the same position. In this embodiment, both the first and second horizontally movable positioning rods 63 and 64 can utilize a screw-nut mechanism to achieve their movable assembly within the U-shaped tube 62.

[0048] As described above, since the first horizontal movable positioning rod 63 and the second horizontal movable positioning rod 64 clamp the positioning plate 5, friction loss is generated between the first horizontal movable positioning rod 63 and the second horizontal movable positioning rod 64 and the positioning plate. Therefore, the steam turbine rotor repair device further includes a fixed second fixed bracket 71 and an oil receiving box 7 fixed to the second fixed bracket 71. The oil receiving box 7 is used to lubricate the positioning plate 5. Figure 1 In this embodiment, lubricating oil is placed in the oil receiving box 7, and the lower end of the positioning plate 5 is placed in the oil receiving box 7. As the positioning plate 5 rotates, the outer surface of the positioning plate 5 is evenly stained with lubricating oil, thereby reducing friction loss with the first horizontally movable positioning rod 63 and the second horizontally movable positioning rod 64, reducing the maintenance cost of the inspection equipment and the rotor, and saving manpower and material costs.

[0049] like Figure 1As shown, the steam turbine rotor inspection and repair device also includes a fixed third fixing bracket 21, on which the drive device 2 is mounted to prevent vibrations from the drive device 2 from affecting rotor inspection and measurement. In this example, the rotor rear shaft head 1 is mounted within the turbine bearing housing 9 of the steam turbine, and the drive device 2 is secured to the turbine bearing housing 9 via the third fixing bracket 21, thereby improving space utilization. Of course, the first fixing bracket 61 and the second fixing bracket 71 described above can also be mounted on the turbine bearing housing 9. Furthermore, the drive device 2 can be a hydraulic drive, an electric motor drive, or a manual drive, and can be configured according to actual needs.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A steam turbine rotor maintenance device, comprising a rotor rear shaft head (1) and a hydraulic turning drive device (2), characterized in that: The invention also includes a differential bolt assembly for a hydraulic turning gear, wherein the differential bolt assembly for the hydraulic turning gear includes a bolt (3) and a one-way bearing (4); the bolt (3) is used for rigid connection with the rear shaft head (1) of the rotor; the inner sleeve (41) of the one-way bearing (4) is coaxially fixedly connected to the bolt (3); and the outer sleeve (42) of the one-way bearing (4) is used for coaxially fixedly connected to the driving device (2) of the hydraulic turning gear; The bolt (3) is rigidly connected to the rotor rear shaft head (1), and the outer sleeve (42) of the one-way bearing (4) is coaxially fixedly connected to the driving device (2) of the hydraulic turning gear; It also includes a coupling (8), and the outer sleeve (42) of the one-way bearing (4) is fixedly connected to the driving device (2) of the hydraulic turning gear through the coupling (8); The inner sleeve (41) of the one-way bearing (4) and the bolt (3) are fixedly connected via a plurality of first fixing bolts (43), and the outer sleeve (42) of the one-way bearing (4) and the coupling (8) are fixedly connected via a plurality of second fixing bolts (44); It also includes a positioning disc (5) and an axial positioning assembly (6) for axially fixing the positioning disc (5) and fixedly arranged; the positioning disc (5) is fixed on the rotor rear shaft head (1), and a positioning center hole is provided in the positioning disc (5) for positioning with the bolt (3); The axial positioning assembly (6) comprises a first fixed bracket (61), a U-shaped tube (62) fixed to the first fixed bracket (61), and a first horizontal movable positioning rod (63) and a second horizontal movable positioning rod (64) both movably assembled in the U-shaped tube (62); the positioning plate (5) is clamped between the first horizontal movable positioning rod (63) and the second horizontal movable positioning rod (64); When the hydraulic turning drive device (2) drives the rotor rear shaft head (1) to rotate, the one-way bearing (4) is in a locked state.

2. The steam turbine rotor maintenance device according to claim 1, characterized in that: It also includes a fixed second fixing bracket (71) and an oil receiving box (7) fixed on the second fixing bracket (71), wherein the oil receiving box (7) is used to lubricate the positioning plate (5).

3. The steam turbine rotor maintenance device according to claim 1, characterized in that: It also includes a fixed third fixing bracket (21), and the driving device (2) is installed on the third fixing bracket (21).

4. The steam turbine rotor maintenance device according to claim 1, characterized in that: The driving device (2) is a hydraulic driving device, a motor driving device, or a manual driving device.

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