A low-speed mechanical barring gear for steam turbine maintenance

Abstract

The present invention relates to a low-speed mechanical barring gear, and particularly to a low-speed mechanical barring gear for steam turbine maintenance. The object of the present invention is to provide a low-speed mechanical barring gear for steam turbine maintenance that can avoid damage to gears, is simple to operate, and can avoid waste of lubricating oil. The present invention provides such a low-speed mechanical barring gear for steam turbine maintenance, which includes a barring gear device, a transmission mechanism, a lifting mechanism, and a lubrication mechanism. A transmission mechanism for driving the rotor of the steam turbine to rotate is provided on the barring gear device. A lifting mechanism for controlling the up and down movement of the transmission mechanism is provided on the barring gear device. A lubrication mechanism for lubricating the transmission mechanism is provided on the barring gear device. By using an electric push rod as the driving force, the present invention can drive the transmission gear to move downward. Under the buffering action of the first spring, the transmission gear can be accurately engaged with the large barring gear on the steam turbine, thereby preventing damage to the transmission gear, and having a simple structure and convenient operation.

Description

Technical Field

[0001] The present invention relates to a low-speed mechanical barring gear, and particularly to a low-speed mechanical barring gear for steam turbine maintenance. Background Art

[0002] Before the steam turbine starts and rotates impulsively or after it stops, the rotor needs to rotate at a certain speed for a period of time to keep the temperature field of the steam turbine rotor symmetrically distributed along the axis circumference, prevent the rotor from being bent due to uneven heating, or prevent the rotor from being accidentally bent due to uneven heating. Long-term continuous barring can correct the thermal bending of the rotor. The barring device is a device that can make the rotor rotate at a low speed under such circumstances.

[0003] The current steam turbine barring devices are basically composed of an electric motor, a gear reducer, and a swing gear. During operation, the electric motor drives the reducer, the reducer drives the swing gear, and the swing gear then drives the driving gear, gradually reducing the speed step by step. When starting, the swing gear is pushed by the starting mechanism to mesh with the main shaft gear, and then the electric motor is started to drive the rotor to rotate. However, the gears of the existing barring devices may not be successfully engaged at one time, and there is a large impact force during engagement, which is likely to cause damage to the gears. Moreover, the starting and withdrawing mechanisms are complex, with poor reliability and heavy structure. At the same time, during lubrication, the rotation of the gears will throw the lubricating oil away, resulting in waste.

[0004] In summary, there is an urgent need for a low-speed mechanical barring gear for steam turbine maintenance that can avoid gear damage, is easy to operate, and can avoid waste of lubricating oil to solve the above problems. Summary of the Invention

[0005] In order to overcome the shortcomings that the gears of the existing barring devices may not be successfully engaged at one time, there is a large impact force during engagement, which is likely to cause damage to the gears, the mechanism is complex, and the lubricating oil will be thrown away resulting in waste, the purpose of the present invention is to provide a low-speed mechanical barring gear for steam turbine maintenance that can avoid gear damage, is easy to operate, and can avoid waste of lubricating oil.

[0006] The present invention is achieved through the following technical means:

[0007] A low-speed mechanical barring gear for steam turbine maintenance includes a barring device, a transmission mechanism, a lifting mechanism, and a lubrication mechanism. The barring device is provided with a transmission mechanism for driving the rotor of the steam turbine to rotate, a lifting mechanism for controlling the up and down movement of the transmission mechanism, and a lubrication mechanism for lubricating the transmission mechanism.

[0008] Preferably, the transmission mechanism includes a slide rail, a sliding block, a rotating shaft, a small gear, a load-bearing shaft, a transmission gear, and a first spring. A slide rail is connected to the front side of the barring gear device. A sliding block is slidably connected to the slide rail. A rotating shaft is rotatably connected to the sliding block. A small gear is connected to the rear side of the rotating shaft. When the small gear moves downward, it will mesh with the meshing gear of the barring gear device. A load-bearing shaft is connected to the front side of the rotating shaft. A transmission gear is rotatably connected to the load-bearing shaft. Four first springs are connected between the transmission gear and the load-bearing shaft.

[0009] Preferably, the lifting mechanism includes an electric push rod and a fixed frame. An electric push rod is connected to the front side of the barring gear device. The electric push rod is located above the slide rail. A fixed frame is connected to the telescopic rod of the electric push rod. The rotating shaft is rotatably connected to the fixed frame.

[0010] Preferably, the lubrication mechanism includes a retaining shell, an oil storage tank, a transmission component, a rotating rod, an oil inlet valve, a sponge column, and a discharge plate. A retaining shell is connected to the front side of the barring gear device. The retaining shell is located on the left side of the electric push rod. A rotating rod is rotatably connected to the front side of the barring gear device. An oil storage tank is connected to the rotating rod. The oil storage tank is located inside the retaining shell. A transmission component is connected between the rotating rod and the meshing gear of the barring gear device. An oil inlet valve is connected and communicated with the front side of the oil storage tank. A plurality of discharge plates are evenly spaced and connected to the outside of the oil storage tank and communicated. The discharge plates are in contact with the transmission gear. Sponge columns are connected to the mutually remote ends of the discharge plates.

[0011] Preferably, a protection mechanism for protecting the transmission gear is further included. The protection mechanism includes a guiding frame, a sliding protection frame, a second spring, a connecting rod, a guiding rod, a clamping rod, and a third spring. A guiding frame is connected to the right side of the barring gear device. A sliding protection frame is slidably connected to the guiding frame. The transmission gear is located inside the sliding protection frame. Two second springs are connected between the sliding protection frame and the guiding frame. A connecting rod is connected to the lower part of the fixed frame. Two guiding rods are connected to the right side of the barring gear device. A clamping rod is slidably connected between the two guiding rods. The connecting rod is in contact with the clamping rod. A third spring is connected between the left side of the clamping rod and the barring gear device.

[0012] Preferably, a detection mechanism for detecting the rotational speed of the large barring gear on the steam turbine is further included. The detection mechanism includes a rotational speed sensor and a control box. A rotational speed sensor is connected to the front side of the barring gear device. The rotational speed sensor is located below the retaining shell. A control box is connected to the front side of the barring gear device. The control box is located between the rotational speed sensor and the retaining shell. The rotational speed sensor is electrically connected to the control box. The electric push rod is connected to the control box through an external circuit.

[0013] Preferably, the plurality of discharge plates enclose a circle.

[0014] Preferably, the oil inlet valve is a one-way valve.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. By using an electric push rod as the driving force, the present invention can drive the transmission gear to move downward. Under the buffering effect of the first spring, the transmission gear can accurately engage with the turning gear on the steam turbine, thereby preventing the transmission gear from being damaged, and the structure is simple and the operation is convenient.

[0017] 2. By rotating the discharge plate and the sponge column, the present invention can evenly apply lubricating oil on the transmission gear, and the baffle can block the outside of the discharge plate to prevent waste caused by splashing of the lubricating oil.

[0018] 3. The sliding protective frame of the present invention can protect the transmission gear and prevent the transmission gear from being damaged when not in use.

[0019] 4. The speed sensor of the present invention can detect the speed of the turning gear on the steam turbine. When the speed of the turning gear on the steam turbine reaches the preset value, it can automatically control the transmission gear to move upward and separate from the turning gear on the steam turbine, without manual control, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0021] Figure 2 It is a three-dimensional structural schematic diagram of the turning device of the present invention.

[0022] Figure 3 It is the first explosion diagram of the transmission mechanism of the present invention.

[0023] Figure 4 It is the second explosion diagram of the transmission mechanism of the present invention.

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the lifting mechanism of the present invention.

[0025] Figure 6 It is a three-dimensional structural schematic diagram of the lubricating mechanism of the present invention.

[0026] Figure 7 It is an explosion diagram of the lubricating mechanism of the present invention.

[0027] Figure 8 It is a three-dimensional structural schematic diagram of components such as the fuel tank, the fuel inlet valve, and the sponge column of the present invention.

[0028] Figure 9 It is a three-dimensional structural schematic diagram of the protection mechanism of the present invention.

[0029] Figure 10 It is a three-dimensional structural schematic diagram of components such as the latch rod and the third spring of the present invention.

[0030] Figure 11 Schematic diagram of the three-dimensional structure of the detection mechanism of the present invention.

[0031] Reference numerals in the drawings: 1 - barring gear device, 2 - transmission mechanism, 21 - slide rail, 22 - sliding block, 23 - rotating shaft, 24 - pinion gear, 25 - load-bearing shaft, 26 - transmission gear, 27 - first spring, 3 - lifting mechanism, 31 - electric push rod, 32 - fixing bracket, 4 - lubrication mechanism, 41 - retaining shell, 42 - oil storage tank, 43 - transmission assembly, 44 - rotating rod, 45 - oil inlet valve, 46 - sponge column, 47 - discharge plate, 5 - protection mechanism, 51 - guide frame, 52 - sliding protection frame, 53 - second spring, 54 - connecting rod, 55 - guide rod, 56 - clamping rod, 57 - third spring, 6 - detection mechanism, 61 - rotational speed sensor, 62 - control box. Specific embodiments

[0032] The following further illustrates the technical solution with specific embodiments. It should be noted that: The words indicating directions such as up, down, left, and right mentioned herein are only in terms of the positions of the shown structures in the corresponding drawings. The serial numbers assigned to the components herein, for example: first, second, etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And as used in this application: connection, coupling, unless otherwise specified, all include direct and indirect connection (coupling).

[0033] Embodiment 1

[0034] A low-speed mechanical barring gear for steam turbine maintenance, referring to Figures 1 - 8 , includes a barring gear device 1, a transmission mechanism 2, a lifting mechanism 3 and a lubrication mechanism 4. A transmission mechanism 2 is provided on the barring gear device 1, a lifting mechanism 3 is provided on the barring gear device 1, and a lubrication mechanism 4 is provided on the barring gear device 1.

[0035] Referring to Figure 1 , Figure 3 and Figure 4 , the transmission mechanism 2 includes a slide rail 21, a sliding block 22, a rotating shaft 23, a pinion gear 24, a load-bearing shaft 25, a transmission gear 26 and a first spring 27. A slide rail 21 is bolted to the front side of the barring gear device 1. A sliding block 22 is slidably connected to the slide rail 21. A rotating shaft 23 is rotatably connected to the sliding block 22. A pinion gear 24 is connected to the rear side of the rotating shaft 23. When the pinion gear 24 moves downward, it will mesh with the meshing gear of the barring gear device 1. A load-bearing shaft 25 is connected to the front side of the rotating shaft 23. A transmission gear 26 is rotatably connected to the load-bearing shaft 25. When the barring gear device 1 works, it can drive the pinion gear 24, the load-bearing shaft 25 and the transmission gear 26 to rotate, thereby driving the rotor of the barring gear device 1 to rotate. Four first springs 27 are connected between the transmission gear 26 and the load-bearing shaft 25.

[0036] Reference Figure 1 and Figure 5 The lifting mechanism 3 includes an electric push rod 31 and a fixing frame 32. The electric push rod 31 is bolted to the front side of the barring gear device 1. The electric push rod 31 is located above the slide rail 21. A fixing frame 32 is connected to the telescopic rod of the electric push rod 31. The rotating shaft 23 is rotatably connected to the fixing frame 32. By starting the electric push rod 31, the driving gear 26 can be controlled to move up and down.

[0037] Reference Figure 1 、 Figure 6 、 Figure 7 and Figure 8 The lubricating mechanism 4 includes a retaining shell 41, an oil storage tank 42, a transmission assembly 43, a rotating rod 44, an oil inlet valve 45, a sponge column 46 and a discharge plate 47. The retaining shell 41 is connected to the front side of the barring gear device 1. The retaining shell 41 is located on the left side of the electric push rod 31. A rotating rod 44 is rotatably connected to the front side of the barring gear device 1. An oil storage tank 42 is connected to the rotating rod 44. The oil storage tank 42 is located inside the retaining shell 41. A transmission assembly 43 is connected between the rotating rod 44 and the meshing gear of the barring gear device 1. The transmission assembly 43 consists of two belt pulleys and a flat belt. The two belt pulleys are respectively installed on the rotating rod 44 and the meshing gear of the barring gear device 1. The flat belt is wound between the two belt pulleys. The front side of the oil storage tank 42 is connected to and communicated with an oil inlet valve 45. The oil inlet valve 45 is a one-way valve. A plurality of discharge plates 47 are evenly spaced and connected to the outside of the oil storage tank 42 and are communicated. The discharge plates 47 are in contact with the driving gear 26. The plurality of discharge plates 47 enclose a circle. Sponge columns 46 are connected to the mutually remote ends of the discharge plates 47. The sponge columns 46 can apply the lubricating oil in the oil storage tank 42 onto the driving gear 26.

[0038] When the mechanical barring gear needs to be used, first install the mechanical barring gear at the designated position, then pour an appropriate amount of lubricating oil into the oil storage tank 42 through the oil inlet valve 45. The lubricating oil can wet the sponge column 46 through the discharge plate 47, and then control the barring gear device 1 to work. The meshing gear of the barring gear device 1 can drive the rotating rod 44 to rotate through the transmission component 43, thereby driving the oil storage tank 42, the sponge column 46 and the discharge plate 47 to rotate. The discharge plate 47 can drive the transmission gear 26 to rotate. At this time, the sponge column 46 will contact the transmission gear 26, thereby applying the lubricating oil on the transmission gear 26. The baffle shell 41 can prevent the lubricating oil from being thrown out. After the lubricating oil is applied on the transmission gear 26, start the electric push rod 31, control the telescopic rod of the electric push rod 31 to extend, drive the fixed frame 32 to move downward, thereby driving the sliding block 22, the rotating shaft 23, the pinion gear 24, the bearing shaft 25 and the transmission gear 26 to move downward. The slide rail 21 plays a guiding role, so that the transmission gear 26 is separated from the discharge plate 47, and the pinion gear 24 will mesh with the meshing gear of the barring gear device 1, and the transmission gear 26 will mesh with the barring gear of the steam turbine. If the transmission gear 26 does not mesh with the barring gear of the steam turbine, the transmission gear 26 will first contact the barring gear of the steam turbine. At this time, the transmission gear 26 stops moving downward, and the bearing shaft 25 continues to move downward, driving the transmission gear 26 to move downward. The transmission gear 26 will be rotated by the extrusion of the barring gear of the steam turbine, and the first spring 27 will deform, so that the transmission gear 26 meshes with the barring gear of the steam turbine. Then control the telescopic rod of the electric push rod 31 to stop moving. At this time, the meshing gear of the barring gear device 1 will drive the pinion gear 24 to rotate, thereby driving the rotating shaft 23 and the bearing shaft 25 to rotate. The first spring 27 returns to its original state, and the bearing shaft 25 can drive the transmission gear 26 to rotate. The transmission gear 26 can drive the barring gear of the steam turbine to rotate, thereby driving the rotor of the steam turbine to rotate, so that the rotor of the steam turbine can be evenly heated or cooled, avoiding thermal bending of the rotor of the steam turbine. Moreover, the transmission gear 26 is coated with lubricating oil, which can reduce the wear of the barring gear of the steam turbine, and at the same time can also detect whether the rotor of the steam turbine can rotate normally. When the rotor of the steam turbine reaches a certain rotational speed, control the telescopic rod of the electric push rod 31 to shorten, drive the fixed frame 32 to move upward and reset, thereby driving the sliding block 22, the rotating shaft 23, the pinion gear 24, the bearing shaft 25 and the transmission gear 26 to move upward and reset, so that the pinion gear 24 is separated from the meshing gear of the barring gear device 1, and the transmission gear 26 is separated from the barring gear of the steam turbine, and then turn off the electric push rod 31.

[0039] Embodiment 2

[0040] On the basis of Embodiment 1, referring to Figure 1 、 Figure 9 and Figure 10, it further includes a protection mechanism 5. The protection mechanism 5 includes a guide frame 51, a sliding protection frame 52, a second spring 53, a connecting rod 54, a guide rod 55, a clamping rod 56 and a third spring 57. The guide frame 51 is welded to the right side of the barring gear device 1. The sliding protection frame 52 is slidably connected to the guide frame 51. The transmission gear 26 is located inside the sliding protection frame 52. The sliding protection frame 52 can protect the transmission gear 26. Two second springs 53 are connected between the sliding protection frame 52 and the guide frame 51. The lower part of the fixed frame 32 is connected with the connecting rod 54. Two guide rods 55 are welded to the right side of the barring gear device 1. The clamping rod 56 is slidably connected between the two guide rods 55. The connecting rod 54 contacts the clamping rod 56. A third spring 57 is connected between the left side of the clamping rod 56 and the barring gear device 1.

[0041] Initially, the connecting rod 54 presses the clamping rod 56, and the third spring 57 is in a compressed state. When the mechanical barring gear needs to be used, first push the sliding protection frame 52 forward, and the second spring 53 is compressed, so that the sliding protection frame 52 no longer blocks the outside of the transmission gear 26. When the fixed frame 32 moves downward, it will drive the transmission gear 26 and the connecting rod 54 to move downward, so that the connecting rod 54 is separated from the clamping rod 56, and the third spring 57 returns to its original state, driving the clamping rod 56 to move to the right to clamp the sliding protection frame 52. When the fixed frame 32 moves upward to reset, it will drive the transmission gear 26 and the connecting rod 54 to move upward to reset. When the connecting rod 54 contacts the clamping rod 56, it will squeeze the clamping rod 56 to move to the left, and the third spring 57 is compressed, so that the clamping rod 56 releases the sliding protection frame 52, and the second spring 53 returns to its original state, driving the sliding protection frame 52 to move backward to reset, so that the sliding protection frame 52 blocks the outside of the transmission gear 26 again, thereby being able to protect the transmission gear 26.

[0042] Refer to Figure 1 and Figure 11 , it further includes a detection mechanism 6. The detection mechanism 6 includes a speed sensor 61 and a control box 62. The speed sensor 61 is bolted to the front side of the barring gear device 1. The speed sensor 61 is located below the retaining shell 41. The speed sensor 61 can detect the speed of the barring gear on the steam turbine. The control box 62 is connected to the front side of the barring gear device 1. The control box 62 is located between the speed sensor 61 and the retaining shell 41. The speed sensor 61 is electrically connected to the control box 62. The electric push rod 31 is connected to the control box 62 through an external circuit.

[0043] When it is necessary to use the mechanical barring gear, the rotational speed sensor 61 can be started. The rotational speed sensor 61 can detect the rotational speed of the barring gear on the steam turbine. When the telescopic rod of the electric push rod 31 extends, it can drive the transmission gear 26 to move downward and mesh with the barring gear on the steam turbine, thereby driving the barring gear on the steam turbine to rotate, and then driving the rotor of the steam turbine to rotate. When the rotational speed sensor 61 detects that the rotational speed of the barring gear on the steam turbine reaches the preset value, the rotational speed sensor 61 emits a signal. After receiving the signal, the control box 62 controls the telescopic rod of the electric push rod 31 to shorten, driving the transmission gear 26 to move upward and separate from the barring gear on the steam turbine, so as to achieve the effect of automatic control, without manual control, saving time and effort.

[0044] The above has introduced this application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A low-speed mechanical barring gear for steam turbine maintenance, comprising a barring gear device (1), characterized in that, It further includes a transmission mechanism (2), a lifting mechanism (3) and a lubrication mechanism (4). A transmission mechanism (2) for driving the rotor of the steam turbine to rotate is provided on the barring gear device (1). A lifting mechanism (3) for controlling the up and down movement of the transmission mechanism (2) is provided on the barring gear device (1). A lubrication mechanism (4) for lubricating the transmission mechanism (2) is provided on the barring gear device (1); The transmission mechanism (2) includes a slide rail (21), a sliding block (22), a rotating shaft (23), a small gear (24), a load-bearing shaft (25), a transmission gear (26) and a first spring (27). The front side of the barring gear device (1) is connected with a slide rail (21). A sliding block (22) is slidably connected to the slide rail (21). A rotating shaft (23) is rotatably connected to the sliding block (22). A small gear (24) is connected to the rear side of the rotating shaft (23). When the small gear (24) moves downward, it will engage with the meshing gear of the barring gear device (1). A load-bearing shaft (25) is connected to the front side of the rotating shaft (23). A transmission gear (26) is rotatably connected to the load-bearing shaft (25). Four first springs (27) are connected between the transmission gear (26) and the load-bearing shaft (25); The lifting mechanism (3) includes an electric push rod (31) and a fixing frame (32). The front side of the barring gear device (1) is connected with an electric push rod (31). The electric push rod (31) is located above the slide rail (21). A fixing frame (32) is connected to the telescopic rod of the electric push rod (31). The rotating shaft (23) is rotatably connected to the fixing frame (32); The lubrication mechanism (4) includes a retaining shell (41), an oil storage tank (42), a transmission component (43), a rotating rod (44), an oil inlet valve (45), a sponge column (46) and a discharge plate (47). The front side of the barring gear device (1) is connected with a retaining shell (41). The retaining shell (41) is located on the left side of the electric push rod (31). A rotating rod (44) is rotatably connected to the front side of the barring gear device (1). An oil storage tank (42) is connected to the rotating rod (44). The oil storage tank (42) is located inside the retaining shell (41). A transmission component (43) is connected between the rotating rod (44) and the meshing gear of the barring gear device (1). An oil inlet valve (45) is connected to the front side of the oil storage tank (42) and is in communication. A plurality of discharge plates (47) are evenly spaced and connected to the outside of the oil storage tank (42) and are in communication. The discharge plates (47) are in contact with the transmission gear (26). Sponge columns (46) are connected to the mutually remote ends of the discharge plates (47).

2. The low-speed mechanical barring gear for steam turbine maintenance according to claim 1, wherein, It further includes a protection mechanism (5) for protecting the transmission gear (26). The protection mechanism (5) includes a guide frame (51), a sliding protection frame (52), a second spring (53), a connecting rod (54), a guide rod (55), a clamping rod (56), and a third spring (57). A guide frame (51) is connected to the right side of the barring gear device (1). A sliding protection frame (52) is slidably connected to the guide frame (51). The transmission gear (26) is located inside the sliding protection frame (52). Two second springs (53) are connected between the sliding protection frame (52) and the guide frame (51). A connecting rod (54) is connected to the lower part of the fixed frame (32). Two guide rods (55) are connected to the right side of the barring gear device (1). A clamping rod (56) is slidably connected between the two guide rods (55). The connecting rod (54) contacts the clamping rod (56). A third spring (57) is connected between the left side of the clamping rod (56) and the barring gear device (1).

3. A low-speed mechanical barring gear for steam turbine maintenance according to claim 2, characterized in that, It further includes a detection mechanism (6) for detecting the rotational speed of the large barring gear on the steam turbine. The detection mechanism (6) includes a rotational speed sensor (61) and a control box (62). The rotational speed sensor (61) is connected to the front side of the barring gear device (1). The rotational speed sensor (61) is located below the retaining housing (41). The control box (62) is connected to the front side of the barring gear device (1). The control box (62) is located between the rotational speed sensor (61) and the retaining housing (41). The rotational speed sensor (61) is electrically connected to the control box (62). The electric push rod (31) is connected to the control box (62) through an external circuit.

4. A low-speed mechanical barring gear for steam turbine maintenance according to claim 1, characterized in that, A plurality of discharge plates (47) enclose a circle.

5. A low-speed mechanical barring gear for steam turbine maintenance according to claim 1, characterized in that, The oil inlet valve (45) is a one-way valve.

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