Vibration isolation mounting platform for turboset

Abstract

The invention relates to the technical field of steam turbine vibration reduction, in particular to a steam turbine set vibration isolation mounting platform which is used for blocking vibration generated between a steam turbine and a base, a foundation pit is formed in the base, a supporting plate is arranged between a steam turbine shell and the base, and the steam turbine shell is fixedly connected with the supporting plate; a movable supporting mechanism is arranged in the foundation pit; vibration force generated by the steam turbine is transmitted to the supporting plate through a shell of the steam turbine, and after the vibration force is transmitted to the supporting plate, displacement in the horizontal direction and displacement in the vertical direction of the supporting plate are generated; the process is completed through cooperation of the vertical vibration reduction mechanism and the horizontal vibration reduction mechanism, when the vibration reduction mechanisms need to be replaced, the bottom of the supporting plate is supported through the movable supporting mechanism, and then the vertical vibration reduction mechanism and the horizontal vibration reduction mechanism are detached and replaced.

Description

Technical Field

[0001] This invention relates to the field of turbine vibration reduction technology, specifically to a turbine unit vibration isolation installation platform. Background Technology

[0002] A steam turbine is a rotating machine that uses steam as a working medium to convert thermal energy into mechanical energy. It is widely used in power generation, marine propulsion, and industrial fields.

[0003] The working principle of a steam turbine is based on the expansion of steam. High-temperature, high-pressure steam is injected into the turbine blades through a series of nozzles. The kinetic energy of the steam is converted into the rotational kinetic energy of the blades, thereby driving the turbine shaft to rotate and generating mechanical energy. This mechanical energy can be used to drive equipment such as generators, pumps, and compressors.

[0004] Under normal circumstances, steam turbines will generate a certain degree of vibration, which is caused by unavoidable factors such as high-speed rotation, steam flow, and thermal expansion. Steam turbines are installed on a base, and generally, the transmission of vibration during steam turbine operation is reduced by designing the base and support structure as a flexible system and using vibration isolation pads, spring supports, etc. Vibration reduction devices can effectively reduce the impact of structural vibration on the base and reduce unnecessary vibration.

[0005] However, steam turbines are usually very large pieces of equipment, especially those used in industrial applications. Moreover, vibration isolation bases and damping devices are usually closely integrated with the turbine's foundation structure, and their installation locations are quite complex. For example, damping elements may be located between the turbine base and the bearing housing, or directly connected to the concrete foundation. This makes it necessary to dismantle the surrounding support structure or other equipment during replacement, making the replacement of the damping devices very complicated and increasing the workload. To address this problem, a vibration isolation installation platform for steam turbine units needs to be proposed. Summary of the Invention

[0006] In view of this, the purpose of this invention is to provide a turbine unit vibration isolation installation platform to solve the problem of cumbersome technical issues in replacing the vibration damping device between the turbine and the base.

[0007] To achieve the above objectives, the present invention provides a turbine unit vibration isolation installation platform for blocking vibrations generated between the turbine and the base. The base has a pit, and a support plate is provided between the turbine casing and the base, with the support plate positioned above the pit. The turbine casing and the support plate are fixedly connected. The pit is equipped with a movable support mechanism, which is used to support the bottom of the support plate. The pit is also equipped with a vertical vibration damping mechanism and a horizontal vibration damping mechanism. The vertical vibration damping mechanism is used to dampen the vertical vibration of the support plate, and the horizontal vibration damping mechanism is installed on the vertical vibration damping mechanism and is used to control the horizontal vibration damping of the support plate.

[0008] Preferably, the outer diameter of the support plate is smaller than the inner diameter of the pit, and the support plate is surrounded by damping elements.

[0009] Preferably, the horizontal vibration damping mechanism includes an annular body, an elastic element is provided on the inner edge surface of the annular body, the elastic element is arranged along the axis of the annular body, one end of the elastic element is connected to the annular body, and the other end of the elastic element is provided with a roller and rotatably connected to it; The bottom of the support plate is provided with an annular cylinder, and the bottom of the annular cylinder is conical; The roller is in contact with the outer wall of the annular cylinder.

[0010] Preferably, the elastic element includes a limiting rod, one end of which is fixedly connected to the inner edge surface of the annular body, and the other end of which is provided with a limiting piece, the diameter of which is larger than that of the limiting rod; The elastic element also includes a sleeve, one end of which is open and fitted onto the limiting rod. A limiting ring is provided at the open end of the sleeve, and the inner diameter of the limiting ring is smaller than the outer diameter of the limiting piece. The sleeve is equipped with a first spring inside. One end of the first spring contacts the inner end wall of the sleeve, and the other end of the first spring contacts the limiting piece.

[0011] Preferably, the vertical vibration damping mechanism includes a top ring and a bottom plate. The top surface of the top ring is distributed with first balls. The bottom plate is provided with top rods distributed thereon. The top end of the top rod passes through the top ring. The top end of the top rod is provided with an insertion rod, and the insertion rod is higher than the top ring. The bottom wall of the annular cylinder is provided with an insertion hole corresponding to the insertion rod. A second spring for pushing the top ring is provided between the top ring and the bottom plate, and the second spring is sleeved on the top rod.

[0012] Preferably, the vertical vibration damping mechanism also includes a base frame, which is cylindrical and the base plate is circular. The diameter of the base plate is smaller than the inner diameter of the base frame, and the ring is fixedly connected to the base frame through the frame body. An end ring is provided at the top of the base frame. The end ring is higher than the base plate, and the inner diameter of the end ring is smaller than the diameter of the base plate. The base frame is also equipped with a third spring for pushing the base plate into contact with the end ring and a second ball bearing. The base frame is equipped with a distance sensor for detecting the base plate.

[0013] Preferably, the vibration isolation installation platform also includes an upper lifting mechanism, which is located inside the foundation pit. A positioning groove is provided inside the foundation pit, and the positioning groove is located below the base frame. The upper lifting mechanism includes a support plate and a cylinder. The support plate is located in a positioning groove. A connecting rod is provided at the center of the support plate. The length of the connecting rod is greater than the thickness of the support plate. The connecting rod is slidably connected to the support plate. A docking rod is provided at the top of the connecting rod. The bottom of the base frame has an opening corresponding to the docking rod. The cylinder is used to push the tray in the positioning groove to rise. The bottom end of the connecting rod is provided with a bottom column, and the output shaft of the cylinder is connected to the bottom column.

[0014] Preferably, the movable support mechanism includes a top plate symmetrically arranged in the foundation pit, the top plate being vertically slidably connected to the foundation pit, and the movable support mechanism also includes an upper jacking drive mechanism, which is connected to the top plate via a linkage rod.

[0015] Preferably, the top drive mechanism includes a slide rail symmetrically arranged inside the pit, a slider slidably arranged on the slide rail, one end of the connecting rod is hinged to the top plate, the other end of the connecting rod is hinged to the slider, and a threaded rod is rotatably arranged on the slide rail, the threaded rod passes through the slider and is threadedly connected to it. The upper drive mechanism also includes a transmission rod and a servo motor. The end of the transmission rod is provided with a first bevel gear, and the end of the threaded rod is provided with a second bevel gear. The first bevel gear meshes with the second bevel gear. The output shaft of the servo motor is connected to the transmission rod via a synchronous belt drive.

[0016] The beneficial effects of this invention are: In this invention, the vibration force generated by the steam turbine is transmitted to the support plate through its outer casing. After being transmitted to the support plate, this vibration force will produce horizontal and vertical displacements. This process is accomplished through the cooperation of the vertical and horizontal vibration damping mechanisms. When it is necessary to replace the vibration damping mechanism, the bottom of the support plate is supported by a movable support mechanism, so that the vertical and horizontal vibration damping mechanisms are no longer bearing the load on the support plate. Subsequently, the vertical and horizontal vibration damping mechanisms are removed and replaced. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a side view of the present invention; Figure 3 This is the front view of the present invention; Figure 4 for Figure 3 A sectional view along the AA direction; Figure 5 for Figure 4 Enlarged view of point B; Figure 6 This is a schematic diagram of the internal structure of the present invention; Figure 7 This is a three-dimensional exploded view of the support plate, vertical vibration damping mechanism, and horizontal vibration damping mechanism of the present invention. Figure 8 This is a schematic diagram of the internal structure of the vertical vibration damping mechanism and the horizontal vibration damping mechanism of the present invention; Figure 9 for Figure 8 Enlarged view of point C.

[0019] The numbers on the map are: 1-Steam turbine; 2-Base; 21-Foundation pit; 22-Positioning groove; 3-Support plate; 31-Damping element; 32-Annular cylinder; 321-Insertion hole; 4-Modible support mechanism; 41-Top plate; 42-Connecting rod; 43-Upper drive mechanism; 431-Slide rail; 432-Slider; 433-Threaded rod; 434-Transmission rod; 435-First bevel gear; 436-Second bevel gear; 437-Servo motor; 5-Vertical vibration damping mechanism; 51-Top ring; 511-First ball bearing; 52-Base plate; 53-Top rod; 531-Insertion rod; 532-Second spring; 54-Base frame; 541-End ring; 542-Second ball bearing; 55-Third spring; 6-Horizontal vibration damping mechanism; 61-Annular body; 62-Elastic element; 621-Limiting rod; 622-Limiting plate; 623-Sleeve; 624-Limiting ring; 625-First spring; 63-Roller; 7-Top lifting mechanism; 71-Support plate; 72-Connecting rod; 721-Diamond rod; 722-Bottom column; 73-Cylinder. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0021] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] In a first aspect, the present invention provides a vibration isolation mounting platform for a steam turbine, such as... Figure 1 , Figure 2 and Figure 3 As shown, a foundation pit 21 is provided on the foundation 2 to block the vibration generated between the turbine 1 and the base 2. A support plate 3 is provided between the outer shell of the turbine 1 and the base 2, and the support plate 3 is located above the foundation pit 21. The outer shell of the turbine 1 is fixedly connected to the support plate 3. The pit 21 is equipped with a movable support mechanism 4, which is used to support the bottom of the support plate 3. The pit 21 is also equipped with a vertical vibration damping mechanism 5 and a horizontal vibration damping mechanism 6. The vertical vibration damping mechanism 5 is used to dampen the support plate 3 vertically. The horizontal vibration damping mechanism 6 is installed on the vertical vibration damping mechanism 5 and is used to control the horizontal vibration damping of the support plate 3.

[0023] In this embodiment, when the steam turbine 1 vibrates during operation, due to the structure of the steam turbine 1, the resulting sway will exist in both axial and radial directions. The vibration force generated by the steam turbine 1 will be transmitted to the support plate 3 through its outer casing. This vibration force will generate horizontal and vertical displacements after being transmitted to the support plate 3. This process will be completed by the cooperation of the vertical vibration damping mechanism 5 and the horizontal vibration damping mechanism 6. Since the vibration effect will be poor to a certain extent under long-term vibration during the operation of the steam turbine 1, it is necessary to replace the corresponding vibration damping mechanism when the vibration damping effect decreases. The bottom of the support plate 3 is supported by the movable support mechanism 4, so that the vertical vibration damping mechanism 5 and the horizontal vibration damping mechanism 6 are no longer supporting the support plate 3. Subsequently, the vertical vibration damping mechanism 5 and the horizontal vibration damping mechanism 6 are removed and replaced.

[0024] As one implementation method, such as Figures 1 to 9 As shown, further details are as follows: The outer diameter of the support plate 3 is smaller than the inner diameter of the pit 21, and the support plate 3 is surrounded by a damping element 31.

[0025] In this embodiment, the damping element 31 is preferably made of rubber to prevent external debris from falling in through the gap between the support plate 3 and the pit 21.

[0026] The horizontal vibration damping mechanism 6 includes an annular body 61, on the inner edge of which an elastic element 62 is provided. The elastic element 62 is arranged along the axis of the annular body 61. One end of the elastic element 62 is connected to the annular body 61, and the other end of the elastic element 62 is provided with a roller 63 and is rotatably connected to it. The bottom of the support plate 3 is provided with an annular cylinder 32, and the bottom of the annular cylinder 32 is conical; The roller 63 is in contact with the outer wall of the annular cylinder 32.

[0027] The elastic element 62 includes a limiting rod 621, one end of which is fixedly connected to the inner edge surface of the annular body 61, and the other end of which is provided with a limiting piece 622, the diameter of which is larger than that of the limiting rod 621. The elastic element 62 also includes a sleeve 623, one end of which is open and sleeved on the limiting rod 621. A limiting ring 624 is provided at the open end of the sleeve 623, and the inner diameter of the limiting ring 624 is smaller than the outer diameter of the limiting piece 622. The sleeve 623 is provided with a first spring 625 inside. One end of the first spring 625 contacts the inner end wall of the sleeve 623, and the other end of the first spring 625 contacts the limiting piece 622.

[0028] The vertical vibration damping mechanism 5 includes a top ring 51 and a bottom plate 52. The top surface of the top ring 51 is provided with first balls 511. The bottom plate 52 is provided with top rods 53, the top end of the top rods 53 passes through the top ring 51, and the top end of the top rods 53 is provided with an insertion rod 531, which is higher than the top ring 51. The bottom wall of the annular cylinder 32 is provided with an insertion hole 321 corresponding to the insertion rod 531. A second spring 532 for pushing the top ring 51 is provided between the top ring 51 and the bottom plate 52. The second spring 532 is sleeved on the top rod 53.

[0029] The vertical vibration damping mechanism 5 also includes a base frame 54, which is cylindrical and the base plate 52 is circular. The diameter of the base plate 52 is smaller than the inner diameter of the base frame 54. The ring is fixedly connected to the base frame 54 through the frame body. An end ring 541 is provided on the top of the base frame 54. The end ring 541 is higher than the base plate 52, and the inner diameter of the end ring 541 is smaller than the diameter of the base plate 52. The base frame 54 is also provided with a third spring 55 for pushing the base plate 52 into contact with the end ring 541 and a second ball bearing 542 distributed thereon; A distance sensor for detecting the base plate 52 is installed on the base frame 54.

[0030] The vibration isolation installation platform also includes an upper lifting mechanism 7, which is located inside the foundation pit 21. A positioning groove 22 is provided inside the foundation pit 21, and the positioning groove 22 is located below the base frame 54. The upper lifting mechanism 7 includes a support plate 71 and a cylinder 73. The support plate 71 is located in the positioning groove 22. A connecting rod 72 is provided at the center of the support plate 71. The length of the connecting rod 72 is greater than the thickness of the support plate 71. The connecting rod 72 is slidably connected to the support plate 71. A docking rod 721 is provided at the top of the connecting rod 72. The bottom of the base frame 54 has an opening corresponding to the docking rod 721. The cylinder 73 is used to push the tray 71 in the positioning groove 22 to rise. The bottom end of the connecting rod 72 is provided with a bottom column 722, and the output shaft of the cylinder 73 is connected to the bottom column 722.

[0031] In this embodiment, before installing the vertical vibration damping mechanism 5 and the horizontal vibration damping mechanism 6, the bottom of the support plate 3 needs to be supported by the movable support mechanism 4. Then, the vertical vibration damping mechanism 5 is pushed into the positioning groove 22 inside the pit 21. At this time, the upper lifting mechanism 7 starts to work, and the piston rod of the cylinder 73 pushes the connecting rod 72 upward through the bottom column 722 until the docking rod 721 at the top of the connecting rod 72 is inserted into the insertion hole at the bottom of the base frame 54. Since the radial surfaces of the docking rod 721 and the bottom column 722 are both larger than the radial surface of the channel formed by the connecting rod 72 penetrating the support plate 71, Therefore, as the piston rod of cylinder 73 continues to push the bottom column 722 upward, the bottom column 722 will lift the support plate 71, thereby driving the base frame 54 to rise. During the rise of the base frame 54, the annular body 61 will move with it. Multiple rollers 63 in the inner ring of the annular body 61 will contact the bottom conical part of the annular cylinder 32 of the support plate 3 and gradually move along it to the outer edge of the annular cylinder 32, thus completing the entire rising process. At this time, the top ring 51 will contact the lower bottom wall of the annular cylinder 32, and multiple insert rods 531 above the top ring 51 will be inserted into the insertion holes 321 accordingly. The vibration force generated by the steam turbine 1 will be transmitted to the support plate 3 through its outer shell. After being transmitted to the support plate 3, this vibration force will generate its horizontal displacement. During the vibration of the support plate 3 with the outer shell of the steam turbine 1, multiple elastic elements 62 arranged around the inner edge of the annular body 61 provide a vibration reduction effect. During the process of the specific elastic element 62 being subjected to force, the displacement generated by the support plate 3 is transmitted to the roller 63 through the annular cylinder 32. The roller 63 compresses the first spring 625 inside it through the sleeve 623. The first spring 625 isolates and reduces the displacement caused by the support plate 3. The vibration force generated by the steam turbine 1 will be transmitted to the support plate 3 through its outer shell. After being transmitted to the support plate 3, this vibration force will produce a vertical displacement. During the vibration of the support plate 3 with the outer shell of the steam turbine 1, the support plate 3 will descend through the annular cylinder 32 to squeeze the top ring 51. At this time, the second spring 532 will isolate and reduce the longitudinal vibration generated by the support plate 3. When turbine 1 experiences imbalance, bearing damage, or other malfunctions, the vibration amplitude will increase significantly. In these cases, the vibration amplitude may exceed 5mm or even higher, potentially leading to equipment damage or malfunction. Therefore, a two-stage vibration damping system is implemented in the vertical vibration damping mechanism 5. After the top ring 51 transmits force to the second spring 532, and the preload of the second spring 532 is exceeded, the base plate 52 will transmit the pressure to the third spring 55. The stiffness coefficient of the third spring 55 is greater than that of the second spring 532. A distance sensor installed on the base frame 54 detects whether the base plate 52 has shifted. When the distance sensor detects shift in the base plate 52, it indicates that the vibration amplitude of turbine 1 is too large, potentially indicating structural damage. This allows the staff to promptly inspect and repair the turbine 1 structure.

[0032] As one implementation method, such as Figure 4 As shown, further details are as follows: The movable support mechanism 4 includes a top plate 41 symmetrically arranged in the foundation pit 21. The top plate 41 is vertically slidably connected to the foundation pit 21. The movable support mechanism 4 also includes an upper drive mechanism 43, which is connected to the top plate 41 through a connecting rod 42.

[0033] like Figure 6 As shown, further details are as follows: The top drive mechanism 43 includes a slide rail 431, which is symmetrically arranged inside the pit 21. A slider 432 is slidably arranged on the slide rail 431. One end of the connecting rod 42 is hinged to the top plate 41, and the other end of the connecting rod 42 is hinged to the slider 432. A threaded rod 433 is rotatably arranged on the slide rail 431, which passes through the slider 432 and is threadedly connected to it. The upper drive mechanism 43 also includes a transmission rod 434 and a servo motor 437. The end of the transmission rod 434 is provided with a first bevel gear 435, and the end of the threaded rod 433 is provided with a second bevel gear 436. The first bevel gear 435 and the second bevel gear 436 mesh. The output shaft of the servo motor 437 is connected to the transmission rod 434 by a synchronous belt drive.

[0034] In this embodiment, when the movable support mechanism 4 starts working, the servo motor 437 starts operating and drives the transmission rod 434, which in turn drives the first bevel gear 435. Since the first bevel gear 435 meshes with the second bevel gear 436, the first bevel gear 435 will drive the threaded rod 433 to rotate through the second bevel gear 436. Since the threaded rod 433 is threadedly connected to the slider 432, the threaded rod 433 will drive the slider 432 to move along the slide rail 431, and the slider 432 will drive the top plate 41 to rise or fall through the connecting rod 42.

[0035] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0036] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A vibration isolation mounting platform for a steam turbine (1) assembly, used to block vibrations generated between the steam turbine (1) and the base (2), characterized in that, A pit (21) is provided on the base (2), and a support plate (3) is provided between the outer shell of the steam turbine (1) and the base (2), and the support plate (3) is located above the pit (21). The outer shell of the steam turbine (1) is fixedly connected to the support plate (3). The pit (21) is equipped with a movable support mechanism (4), which is used to support the bottom of the support plate (3). The pit (21) is also equipped with a vertical vibration damping mechanism (5) and a horizontal vibration damping mechanism (6). The vertical vibration damping mechanism (5) is used to dampen the support plate (3) vertically. The horizontal vibration damping mechanism (6) is installed on the vertical vibration damping mechanism (5) and is used to control the horizontal vibration damping of the support plate (3).

2. The vibration isolation installation platform for a steam turbine (1) group according to claim 1, characterized in that, The outer diameter of the support plate (3) is smaller than the inner diameter of the pit (21), and the support plate (3) is surrounded by damping elements (31).

3. The vibration isolation installation platform for a steam turbine (1) group according to claim 1, characterized in that, The horizontal vibration damping mechanism (6) includes an annular body (61), and an elastic element (62) is provided on the inner edge surface of the annular body (61). The elastic element (62) is arranged along the axis of the annular body (61), one end of the elastic element (62) is connected to the annular body (61), and the other end of the elastic element (62) is provided with a roller (63) and is rotatably connected to it. The bottom of the support plate (3) is provided with an annular cylinder (32), and the bottom of the annular cylinder (32) is conical; The roller (63) is in contact with the outer wall of the annular cylinder (32).

4. The vibration isolation installation platform for a steam turbine (1) group according to claim 3, characterized in that, The elastic element (62) includes a limiting rod (621), one end of which is fixedly connected to the inner edge of the annular body (61), and the other end of which is provided with a limiting piece (622), the diameter of which is larger than that of the limiting rod (621). The elastic element (62) also includes a sleeve (623), one end of which is open and sleeved on the limiting rod (621). A limiting ring (624) is provided at the open end of the sleeve (623), and the inner diameter of the limiting ring (624) is smaller than the outer diameter of the limiting piece (622). The sleeve (623) is provided with a first spring (625) inside. One end of the first spring (625) is in contact with the inner end wall of the sleeve (623), and the other end of the first spring (625) is in contact with the limiting piece (622).

5. The vibration isolation installation platform for a steam turbine (1) group according to claim 3, characterized in that, The vertical vibration damping mechanism (5) includes a top ring (51) and a bottom plate (52). The top surface of the top ring (51) is provided with first ball bearings (511). The bottom plate (52) is provided with top rods (53). The top end of the top rods (53) passes through the top ring (51). The top end of the top rods (53) is provided with a plug rod (531), and the plug rod (531) is higher than the top ring (51). The bottom wall of the annular cylinder (32) is provided with an insertion hole (321) corresponding to the plug rod (531). A second spring (532) for pushing the top ring (51) is provided between the top ring (51) and the bottom plate (52), and the second spring (532) is sleeved on the top rod (53).

6. The vibration isolation installation platform for a steam turbine (1) group according to claim 5, characterized in that, The vertical vibration damping mechanism (5) also includes a base frame (54), which is cylindrical and the base plate (52) is circular. The diameter of the base plate (52) is smaller than the inner diameter of the base frame (54), and the ring is fixedly connected to the base frame (54) through the frame body. An end ring (541) is provided on the top of the base frame (54). The end ring (541) is higher than the base plate (52), and the inner diameter of the end ring (541) is smaller than the diameter of the base plate (52). The base frame (54) is also provided with a third spring (55) for pushing the base plate (52) to contact the end ring (541) and a second ball bearing (542) is distributed thereon. A distance sensor for detecting the base plate (52) is installed on the base frame (54).

7. The vibration isolation installation platform for a steam turbine (1) unit according to claim 6, characterized in that, The vibration isolation installation platform also includes an upper lifting mechanism (7), which is located inside the foundation pit (21). A positioning groove (22) is provided inside the foundation pit (21), and the positioning groove (22) is located below the base frame (54). The top-mounting mechanism (7) includes a support plate (71) and a cylinder (73). The support plate (71) is located in the positioning groove (22). A connecting rod (72) is provided at the center of the support plate (71). The length of the connecting rod (72) is greater than the thickness of the support plate (71). The connecting rod (72) is slidably connected to the support plate (71). A docking rod (721) is provided at the top of the connecting rod (72). An opening corresponding to the docking rod (721) is provided at the bottom of the base frame (54). The cylinder (73) is used to push the tray (71) in the positioning groove (22) to rise. The bottom end of the connecting rod (72) is provided with a bottom column (722), and the output shaft of the cylinder (73) is connected to the bottom column (722).

8. The vibration isolation installation platform for a steam turbine (1) group according to claim 1, characterized in that, The movable support mechanism (4) includes a top plate (41) symmetrically arranged in the pit (21). The top plate (41) is vertically slidably connected to the pit (21). The movable support mechanism (4) also includes an upper drive mechanism (43), which is connected to the top plate (41) via a connecting rod (42).

9. A vibration isolation installation platform for a steam turbine (1) group according to claim 1, characterized in that, The top drive mechanism (43) includes a slide rail (431), which is symmetrically arranged inside the pit (21). A slider (432) is slidably arranged on the slide rail (431). One end of the connecting rod (42) is hinged to the top plate (41), and the other end of the connecting rod (42) is hinged to the slider (432). A threaded rod (433) is rotatably arranged on the slide rail (431), and the threaded rod (433) passes through the slider (432) and is threadedly connected to it. The upper drive mechanism (43) also includes a transmission rod (434) and a servo motor (437). The end of the transmission rod (434) is provided with a first bevel gear (435), and the end of the threaded rod (433) is provided with a second bevel gear (436). The first bevel gear (435) meshes with the second bevel gear (436). The output shaft of the servo motor (437) is connected to the transmission rod (434) by a synchronous belt drive.

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