Double-drive large wind turbine main shaft bearing seal ring sealing performance test device

Abstract

The invention discloses a dual-drive large-scale wind power main shaft bearing sealing ring sealing performance testing device, which has a main shaft, self-aligning bearings are installed at both ends of the main shaft, a horizontal moving workbench and a vertical moving workbench are installed at the bottom of the self-aligning bearing, and a main shaft rotation drive motor is connected to the right end of the main shaft; a disc-shaped frame and left and right inner-linked simulation rings are installed on the main shaft, an inner gear turntable bearing is installed on the disc-shaped frame, and left and right outer-linked simulation rings are installed on the inner gear turntable bearing, and left and right annular mounting grooves are respectively provided on the inner ring surfaces of the left and right outer-linked simulation rings, and a clamping ring is provided outside the mounting groove, and an inner oil-separating sleeve is sealed between the left and right inner-linked simulation rings, and an outer oil-separating sleeve is sealed between the left and right outer-linked simulation rings, and an annular oil injection chamber is formed between the inner and outer oil-separating sleeves, and an inner ring drive motor is also installed on the disc-shaped frame, and a brake is installed on the output shaft of the main shaft rotation drive motor. The invention can be used to test the sealing performance of the large-scale wind power main shaft bearing sealing ring.

Description

Technical Field

[0001] The invention relates to a large-scale wind turbine main shaft bearing sealing ring, in particular to a dual-drive large-scale wind turbine main shaft bearing sealing ring sealing performance testing device. Background Art

[0002] The diameter of the main shaft bearing seal ring of a large wind turbine is large, and the processing and manufacturing is very difficult. Since the main shaft bearing seal ring of a large wind turbine is mainly used in the air and in the field, the working conditions are complex and harsh, and it is not possible to fully consider the design and manufacturing of the seal ring. It is necessary to repeatedly improve the design and manufacturing of the seal ring according to the use effect during use to meet the use requirements. The improvement of the seal ring mainly involves adjusting the shape of the sealing lip, including the height of the sealing lip, the thickness of the waist, etc., and the size of the clamping spring. Each time the seal ring is improved, the seal ring must be removed from the bearing of the main shaft of the wind turbine. The disassembly process is cumbersome, which not only reduces the power generation efficiency of the wind turbine, but also increases the cost during the disassembly and assembly process. In addition, if the seal fails during the operation of the wind turbine, it may also lead to a production safety accident.

[0003] There is no device for testing the sealing performance of a large wind turbine main shaft bearing seal ring in the prior art. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a dual-drive large-scale wind turbine main shaft bearing seal ring sealing performance testing device, and the present invention can be used to test the sealing performance of large-scale wind turbine main shaft bearing seal rings.

[0005] In order to solve the above technical problems, the invention discloses a dual-drive large-scale wind turbine main shaft bearing sealing ring sealing performance testing device, which has a horizontal main shaft, and the left and right ends of the main shaft are respectively provided with self-aligning bearings through split bearing seats, wherein the bottom of the split bearing seat at the left end is provided with a horizontal movable workbench, and the bottom of the horizontal movable workbench is provided with a vertical movable workbench, and the main shaft end located on the right side of the self-aligning bearing at the right end is connected to the main shaft rotation driving motor through a flexible coupling; left and right inner couplings are positioned on the middle shaft section of the main shaft from left to right in sequence. The dummy ring is provided with a disc-shaped frame mounted on the main shaft on the left side of the left inner-linked simulation ring, an annular gap is provided between the disc-shaped frame and the main shaft, and fixed support brackets are connected to the front and rear sides of the disc-shaped frame; it also includes an internal gear turntable bearing, the left end of the bearing outer ring of the internal gear turntable bearing is fixedly mounted on the outer circumference of the disc-shaped frame, and the right end of the bearing inner ring of the internal gear turntable bearing is fixedly mounted with left and right outer-linked simulation rings corresponding to the left and right inner-linked simulation rings, and the outer ring surfaces of the left and right inner-linked simulation rings are aligned with the inner ring surfaces of the left and right outer-linked simulation rings. An annular test gap is formed between the left and right outer simulation rings, and the left and right annular large wind turbine main shaft bearing sealing ring installation grooves are respectively provided on the inner ring surfaces of the left and right outer simulation rings. The outer sides of the inner ring surfaces of the left and right outer simulation rings are respectively provided with left and right clamping rings that can press the large wind turbine main shaft bearing sealing rings into the left and right annular large wind turbine main shaft bearing sealing ring installation grooves. When the large wind turbine main shaft bearing sealing rings are respectively installed in the left and right annular large wind turbine main shaft bearing sealing ring installation grooves, the sealing limbs can be connected with the outer sides of the left and right inner simulation rings. A dynamic seal is formed between the ring surfaces; an inner oil-isolating sleeve is sealed between the left and right inner simulation rings, an outer oil-isolating sleeve is sealed between the left and right outer simulation rings, an annular oil injection chamber is formed between the inner and outer oil-isolating sleeves, and an oil injection nozzle connected to the oil injection chamber is arranged on the left and right inner simulation rings or the left and right outer simulation rings; the disc-shaped frame is also equipped with an inner ring driving motor for driving the inner ring of the internal gear slewing bearing to rotate, and a first brake is installed on the output shaft of the main shaft rotation driving motor.

[0006] The present invention tests the sealing performance of the large wind power main shaft bearing seal ring installed in the bearing by simulating the working environment of the large wind power main shaft bearing. During the test, the large wind power main shaft bearing seal ring is first pressed into the left and right annular large wind power main shaft bearing seal ring installation grooves through the left and right clamping rings, and then grease is injected into the oil filling chamber through the oil filling nozzle, and then the main shaft rotation drive motor and the inner ring drive motor are turned on to test the sealing performance of the seal ring. If the seal ring leaks, the cause of the leakage is analyzed and the seal ring structure is improved accordingly; then the main shaft is moved forward and backward in a small range by adjusting the horizontal moving workbench or the main shaft is moved vertically in a small range by adjusting the vertical moving workbench, and the sealing performance of the seal ring is tested again. If the seal ring leaks, the cause of the leakage is analyzed again and the seal ring structure is improved accordingly. After the present invention is applied, the sealing performance test of the large wind power main shaft bearing seal ring can be carried out, and the simulation test can be carried out without being installed in the main shaft bearing of the wind power unit, and the structure of the seal ring is easy to improve, and the normal operation of the wind power unit will not be affected.

[0007] As an improvement of the present invention, two sections with enlarged diameters are formed on the middle section of the main shaft, the diameter of the left section is larger than the diameter of the right section, the diameter of the right section is larger than the diameter of the main shaft, the disc-shaped frame is located on the left side of the left section, the left inline simulation ring is positioned on the right section, and the left side of the left inline simulation ring abuts against the right side wall of the left section, the right inline simulation ring is positioned on the main shaft, and the left side of the right inline simulation ring abuts against the right side wall of the right section, and a positioning sleeve is provided between the left and right inline simulation rings and is mounted on the right section. After adopting the above technical features, the installation of the left and right inline simulation rings is more secure and reliable.

[0008] As a further improvement of the present invention, the left and right inner line simulation rings are respectively composed of inner left and right inner line simulation rings positioned on the intermediate shaft section and outer left and right inner line simulation rings respectively connected to the outer circumference of the inner left and right inner line simulation rings through first connecting bolts; the left and right outer line simulation rings are respectively composed of outer left and right outer line simulation rings fixedly mounted on the right end of the inner ring of the internal gear turntable bearing and inner left and right outer line simulation rings respectively connected to the inner circumference of the outer left and right outer line simulation rings through second connecting bolts; the inner oil-isolating sleeve seal is installed between the outer left and right inner line simulation rings, and the outer oil-isolating sleeve seal is installed between the inner left and right outer line simulation rings; the oil injection nozzle communicated with the oil injection chamber is arranged on the inner left and right outer line simulation rings or on the outer left and right inner line simulation rings. After adopting the above technical features, the sealing performance of sealing rings with different diameters can be tested by replacing the outer left and right inline simulation rings or the inner left and right outer simulation rings of different sizes, thereby expanding the test range of the present invention for sealing rings with different diameters.

[0009] As another improvement of the present invention, the left and right inner simulation rings or the left and right outer simulation rings are also provided with a grease heater for heating the grease in the oil injection chamber, a temperature sensor for detecting the temperature of the grease in the oil injection chamber, and a pressure sensor for detecting the pressure of the grease in the oil injection chamber. With the above technical features, the temperature of the grease in the oil injection chamber can be changed to simulate the temperature environment in different seasons, thereby performing a more accurate sealing performance test on the sealing ring, and the pressure of the injected grease can be changed to perform a more accurate sealing performance test on the sealing ring.

[0010] As another improvement of the present invention, a second brake for braking the rotation of the inner ring of the internal gear slewing bearing is installed on the disc-shaped frame at intervals.

[0011] Furthermore, an outer connecting ring is arranged between the left end of the outer ring of the bearing and the outer circumference of the disc-shaped frame, and the outer connecting ring and the outer ring of the bearing are connected and fixed in sequence by third connecting bolts arranged at intervals on the outer circumference of the disc-shaped frame. After the outer connecting ring is further arranged, the installation of the internal gear slewing bearing is facilitated.

[0012] Furthermore, the right end of the inner ring of the bearing is fixed with a mounting ring by means of mounting screws, and the outer ends of the left and right outer connection simulation rings are respectively fixed on the left and right sides of the mounting ring. After the mounting rings are further arranged, the assembly between the left and right outer connection simulation rings and the inner ring of the bearing of the internal gear turntable bearing is facilitated. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0014] Figure 1 It is a main cross-sectional structural schematic diagram of a large-scale wind turbine main shaft bearing sealing ring sealing performance testing device of the present invention.

[0015] Figure 2 is along Figure 1 Schematic diagram of the cross-section along line AA.

[0016] Figure 3 It is a structural view of the left end of the main shaft in the present invention.

[0017] Figure 4 is along Figure 3 Schematic cross-sectional view along line BB.

[0018] Figure 5 is along Figure 4 Schematic cross-sectional view of the CC line.

[0019] Figure 6 yes Figure 1 A magnified schematic diagram of the structure at position I.

[0020] Figure 7 yes Figure 1 An enlarged schematic diagram of the structure at position II in the figure.

[0021] Figure 8 After removing the seal ring of the large wind turbine main shaft bearing Figure 7 . DETAILED DESCRIPTION

[0022] See also Figure 1 - Figure 8 The dual-drive large-scale wind turbine main shaft bearing seal ring sealing performance testing device of the present invention comprises a horizontal main shaft 1, and the left and right ends of the main shaft are respectively provided with self-aligning bearings 3 through split bearing seats 2, wherein a horizontal movable workbench 4 is provided at the bottom of the split bearing seat at the left end, and the split bearing seat can be horizontally moved forward and backward on the horizontal movable workbench, and the forward and backward horizontal movement of the split bearing seat can drive one end of the main shaft to move forward and backward accordingly, and a vertical movable workbench 5 is provided at the bottom of the horizontal movable workbench 4, and the horizontal movable workbench can be moved up and down in the vertical direction on the vertical movable workbench The horizontal moving table can move up and down in the vertical direction to drive one end of the main shaft to move up and down in the vertical direction. The main shaft end located on the right side of the right end self-aligning bearing is connected to the main shaft rotation drive motor 7 through a flexible coupling 6; left and right inline simulation rings 8 and 9 are positioned and installed on the middle shaft section of the main shaft 1 from left to right, and a disc-shaped frame 10 is mounted on the main shaft located on the left side of the left inline simulation ring 8. There is an annular gap 11 between the disc-shaped frame and the main shaft, and fixed support brackets 12 are connected to the front and rear sides of the disc-shaped frame; it also includes an internal gear turntable bearing 13, and the shaft of the internal gear turntable bearing The left end of the outer ring 131 of the bearing is fixedly mounted on the outer circumference of the disc-shaped frame 10, and the right end of the inner ring 132 of the internal gear slewing bearing is fixedly mounted with left and right outer simulation rings 14 and 15 corresponding to the left and right inner simulation rings 8 and 9, and an annular test gap 16 is formed between the outer ring surfaces of the left and right inner simulation rings and the inner ring surfaces of the left and right outer simulation rings. The inner ring surfaces of the left and right outer simulation rings are respectively provided with left and right annular large wind turbine main shaft bearing sealing ring mounting grooves 17 and 18, and the outer surfaces of the inner ring surfaces of the left and right outer simulation rings are respectively provided with large wind turbine main shaft bearings. The sealing rings are pressed into the left and right clamping rings 19 and 20 in the left and right annular large wind turbine main shaft bearing sealing ring installation grooves. When the large wind turbine main shaft bearing sealing rings 1000 are respectively installed in the left and right annular large wind turbine main shaft bearing sealing ring installation grooves, the sealing limbs 1001 can form a dynamic seal with the outer ring surfaces of the left and right inner line simulation rings 8 and 9; the inner oil-isolating sleeve 21 is sealed between the left and right inner line simulation rings 8 and 9, and the outer oil-isolating sleeve 22 is sealed between the left and right outer line simulation rings 14 and 15. An annular oil injection chamber 23 is formed between the inner and outer oil-isolating sleeves. Figure 7The oil filling chamber is filled with grease, and an oil filling nozzle 24 connected to the oil filling chamber is provided on the left and right inner simulation rings or the left and right outer simulation rings; the disc-shaped frame 10 is also equipped with an inner ring driving motor 25 for driving the inner ring 132 of the internal gear slewing bearing 13 to rotate, and the output shaft of the main shaft rotation driving motor 7 is equipped with a first brake 26. Two sections with increased diameters are formed on the roughly middle section of the main shaft 1. The diameter of the left section 101 is larger than the diameter of the right section 102, and the diameter of the right section is larger than the diameter of the main shaft. The disc-shaped frame 10 is located on the left side of the left section. The left inline simulation ring 8 is positioned on the right section, and the left side of the left inline simulation ring abuts against the right side wall of the left section 101. The right inline simulation ring 9 is positioned on the main shaft, and the left side of the right inline simulation ring abuts against the right side wall of the right section 102. A positioning sleeve 27 mounted on the right section is provided between the left and right inline simulation rings 8 and 9. The left and right inner simulation rings 8 and 9 are respectively composed of inner left and right inner simulation rings 81 and 91 positioned on the intermediate shaft section and outer left and right inner simulation rings 82 and 92 connected to the outer circumference of the inner left and right inner simulation rings through the first connecting bolts 28, respectively. The left and right outer simulation rings 14 and 15 are respectively composed of outer left and right outer simulation rings 141 and 151 fixedly mounted on the right end of the inner ring 132 of the internal gear turntable bearing and connected to the outer circumference of the inner left and right inner simulation rings through the second connecting bolts 28. The bolts 29 are respectively connected to the inner circumference of the outer left and right outer connection simulation rings 142 and 152; the inner oil-isolating sleeve 21 is sealed between the outer left and right inner connection simulation rings 82 and 92, and the outer oil-isolating sleeve 22 is sealed between the inner left and right outer connection simulation rings 142 and 152; the oil injection nozzle 24 connected to the oil injection chamber 23 is arranged on the inner left and right outer connection simulation rings or the outer left and right inner connection simulation rings. The left and right inner connection simulation rings 8 and 9 or the left and right outer connection simulation rings 14 and 15 are also provided with a grease heater 30 for heating the grease in the oil injection chamber 23, a temperature sensor 31 for detecting the grease temperature in the oil injection chamber, and a pressure sensor 32 for detecting the grease pressure in the oil injection chamber. The disc-shaped frame 10 is also provided with a second brake 33 for braking the rotation of the bearing inner ring 132 of the inner gear slewing bearing 13. The horizontally movable workbench 4 includes a box-shaped shell 401, which has a box bottom plate 402. A horizontally arranged lead screw 403 is rotatably installed in the box-shaped shell, one end of the lead screw is connected to a lead screw rotation drive motor 404, and a slide plate 405 that can slide horizontally along the box body is arranged on the top of the box-shaped shell. A nut 406 screwed on the lead screw is installed at the bottom of the slide plate. The rotation of the lead screw can drive the horizontal movement of the nut, and then drive the horizontal movement of the slide plate. The split bearing seat 2 is fixed on the slide plate 405.The vertical movable workbench 5 comprises a horizontal base plate 501 and a screw rod 502 and a guide rod 503 rotatably mounted on the base plate vertically. One end of a slider 504 is mounted on the guide rod and the other end is mounted on the screw rod through a nut 505 matched with the screw rod. A gear 506 is fixed at the bottom of the screw rod. A transmission gear 508 meshing with the gear is mounted on the output shaft of a screw rotation driving motor 507. The transmission gear can drive the gear to rotate. The rotation of the gear drives the screw rod to rotate accordingly. The rotation of the screw rod drives the nut to move up and down along the screw rod, thereby driving the slider to slide up and down. The top of the slider is fixed to the bottom of the box bottom plate 402. An outer connecting ring 110 is arranged between the left end of the bearing outer ring 131 and the outer circumference of the disc-shaped frame 10. The outer connecting ring and the bearing outer ring are sequentially connected and fixed by third connecting bolts 111 arranged at intervals on the outer circumference of the disc-shaped frame. The right end of the bearing inner ring 132 is fixed with a mounting ring 134 through a mounting screw 133, and the outer ends of the left and right external connection simulation rings 14 and 15 are respectively fixed on the left and right sides of the mounting ring.

Claims

1. A dual-drive large wind turbine main shaft bearing seal ring sealing performance test device, characterized in that: The invention has a horizontal main shaft (1), and the left and right ends of the main shaft are respectively provided with self-aligning bearings (3) through split bearing seats (2), wherein a horizontal movable worktable (4) is provided at the bottom of the split bearing seat at the left end, and a vertical movable worktable (5) is provided at the bottom of the horizontal movable worktable, and a main shaft end located on the right side of the self-aligning bearing at the right end is connected to a main shaft rotation drive motor (7) through a flexible coupling (6); left and right inline simulation rings (8, 9) are positioned and installed in sequence from left to right on the middle shaft section of the main shaft (1), and a disc-shaped frame (10) is mounted on the main shaft located on the left side of the left inline simulation ring (8), and the disc-shaped frame There is an annular gap (11) between the main shaft and the disc-shaped frame, and fixed support brackets (12) are connected to the front and rear sides of the disc-shaped frame; it also includes an internal gear turntable bearing (13), the left end of the bearing outer ring (131) of the internal gear turntable bearing is fixedly mounted on the outer circumference of the disc-shaped frame (10), and the right end of the bearing inner ring (132) of the internal gear turntable bearing is fixedly mounted with left and right outer connection simulation rings (14, 15) corresponding to the left and right inner connection simulation rings (8, 9), and an annular test gap (16) is formed between the outer ring surfaces of the left and right inner connection simulation rings and the inner ring surfaces of the left and right outer connection simulation rings. The inner ring surface is provided with left and right annular large wind turbine main shaft bearing sealing ring installation grooves (17, 18), respectively. The outer sides of the inner ring surfaces of the left and right outer joint simulation rings are provided with left and right clamping rings (19, 20) for pressing the large wind turbine main shaft bearing sealing rings into the left and right annular large wind turbine main shaft bearing sealing ring installation grooves. When the large wind turbine main shaft bearing sealing rings (1000) are respectively installed in the left and right annular large wind turbine main shaft bearing sealing ring installation grooves, the sealing limbs (1001) thereof can form a dynamic seal with the outer ring surfaces of the left and right inner joint simulation rings (8, 9). The left and right inner joint simulation rings (8, 9) are provided with left and right clamping rings (19, 20) for pressing the large wind turbine main shaft bearing sealing rings into the left and right annular large wind turbine main shaft bearing sealing ring installation grooves. An inner oil-isolating sleeve (21) is sealed between the dummy rings (8, 9), an outer oil-isolating sleeve (22) is sealed between the left and right outer-connected simulation rings (14, 15), an annular oil injection chamber (23) is formed between the inner and outer oil-isolating sleeves, and an oil injection nozzle (24) communicating with the oil injection chamber is provided on the left and right inner-connected simulation rings or the left and right outer-connected simulation rings; the disc-shaped frame (10) is also provided with an inner ring driving motor (25) for driving the inner ring (132) of the inner gear turntable bearing (13) to rotate, and a first brake (26) is provided on the output shaft of the spindle rotation driving motor (7).

2. The dual-drive large wind turbine main shaft bearing sealing ring sealing performance testing device according to claim 1, characterized in that: The intermediate shaft section of the main shaft (1) is formed with two shaft sections with increased diameters, the diameter of the left shaft section (101) is larger than the diameter of the right shaft section (102), and the diameter of the right shaft section is larger than the diameter of the main shaft, the disc-shaped frame (10) is located on the left side of the left shaft section, the left inline simulation ring (8) is positioned and mounted on the right shaft section, and the left side of the left inline simulation ring abuts against the right side wall of the left shaft section, the right inline simulation ring (9) is positioned and mounted on the main shaft, and the left side of the right inline simulation ring abuts against the right side wall of the right shaft section, and a positioning sleeve (27) sleeved on the right shaft section is provided between the left and right inline simulation rings (8, 9).

3. The dual-drive large wind turbine main shaft bearing seal ring sealing performance testing device according to claim 1 or 2, characterized in that: The left and right inner simulation rings (8, 9) are respectively composed of inner left and right inner simulation rings (81, 91) positioned on the intermediate shaft section and outer left and right inner simulation rings (82, 92) respectively connected to the outer circumference of the inner left and right inner simulation rings through first connecting bolts (28), and the left and right outer simulation rings (14, 15) are respectively composed of outer left and right outer simulation rings (141, 151) fixedly mounted on the right end of the bearing inner ring (132) of the internal gear turntable bearing and connected to the outer circumference of the inner left and right inner simulation rings through second connecting bolts (28). The bolt (29) is respectively connected to the inner circumference of the outer left and right outer connected simulation rings (142, 152); the inner oil-isolating sleeve (21) is sealed between the outer left and right inner connected simulation rings (82, 92); the outer oil-isolating sleeve (22) is sealed between the inner left and right outer connected simulation rings (142, 152); the oil injection nozzle (24) connected to the oil injection chamber (23) is arranged on the inner left and right outer connected simulation rings or on the outer left and right inner connected simulation rings.

4. The dual-drive large wind turbine main shaft bearing seal ring sealing performance testing device according to claim 1 or 2, characterized in that: The left and right inner simulation rings (8, 9) or the left and right outer simulation rings (14, 15) are also provided with a grease heater (30) for heating the grease in the oil injection chamber (23), a temperature sensor (31) for detecting the temperature of the grease in the oil injection chamber, and a pressure sensor (32) for detecting the pressure of the grease in the oil injection chamber.

5. The dual-drive large wind turbine main shaft bearing seal ring sealing performance testing device according to claim 1, characterized in that: The disc-shaped frame (10) is also provided with a second brake (33) for braking the rotation of the inner ring (132) of the internal gear slewing bearing (13).

6. The dual-drive large wind turbine main shaft bearing seal ring sealing performance testing device according to claim 1, characterized in that: The horizontally movable workbench (4) comprises a box-shaped shell (401), the box-shaped shell having a box bottom plate (402), a screw (403) arranged in a horizontal direction rotatably mounted in the box-shaped shell, one end of the screw being connected to a screw rotation driving motor (404), a slide plate (405) which can slide horizontally along the box body is arranged on the top of the box-shaped shell, a nut (406) screwed on the screw is arranged on the bottom of the slide plate, the rotation of the screw can drive the nut to move horizontally, and further drive the slide plate to move horizontally, and the split bearing seat (2) is fixed on the slide plate (405).

7. The dual-drive large wind turbine main shaft bearing seal ring sealing performance testing device according to claim 6, characterized in that: The vertically movable workbench (5) comprises a horizontal base plate (501) and a screw rod (502) and a guide rod (503) rotatably mounted vertically on the base plate. One end of a slider (504) is mounted on the guide rod and the other end is mounted on the screw rod through a nut (505) matched with the screw rod. A gear (506) is fixedly mounted on the bottom of the screw rod. A transmission gear (508) meshing with the gear is mounted on the output shaft of a screw rotation driving motor (507). The top end of the slider is fixed to the bottom of the box bottom plate (402).

8. The dual-drive large wind turbine main shaft bearing seal ring sealing performance testing device according to claim 1, characterized in that: An outer connecting ring (110) is arranged between the left end of the bearing outer ring (131) and the outer circumference of the disc-shaped frame (10), and the outer connecting ring and the bearing outer ring are sequentially connected and fixed by third connecting bolts (111) arranged at intervals on the outer circumference of the disc-shaped frame.

9. The dual-drive large wind turbine main shaft bearing seal ring sealing performance testing device according to claim 1, characterized in that: The right end of the bearing inner ring (132) is fixedly mounted with a mounting ring (134) via mounting screws (133), and the outer ends of the left and right external connection simulation rings (14, 15) are respectively fixed to the left and right sides of the mounting ring.

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