Two-stage sliding thrust bearing structure and use method

Abstract

The present invention discloses a two-stage sliding thrust bearing structure and a method for using the same, which improves the ability of a device rotor to withstand axial forces. The structure comprises a main shaft and a device support housing. The main shaft has a stepped shaft extension end. A radial thrust bearing is disposed between the large diameter section of the main shaft extension end and the device support housing. The radial thrust bearing is fixed to the device support housing. An inner thrust disc is sleeved on the small diameter section of the main shaft extension end. An adapter ring is fixed to the end of the device support housing. A thrust bearing is disposed between the adapter ring and the small diameter section of the main shaft extension end. The thrust bearing is fixed to the adapter ring. The end faces of the inner thrust disc slide with the corresponding thrust faces of the radial thrust bearing and the thrust bearing. An outer thrust disc is fixed to the end face of the main shaft extension end. The end faces of the outer thrust disc are thrust faces. A thrust bearing end cap is fixed to the end face of the adapter ring. The end faces of the outer thrust disc slide with the corresponding thrust faces of the thrust bearing and the thrust bearing end cap.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and in particular to a two-stage sliding thrust bearing structure and a use method thereof. Background Art

[0002] The thrust bearing is mainly used to bear the axial thrust of the rotor during operation, so as to determine and maintain the relative position between the rotor and the mounting housing. However, with the continuous development of society, many equipment requirements also need to be further improved to meet the current development requirements. For example, the helical gearbox carries more and more power, and the flow and pressure requirements of the compressor blades are getting higher and higher. These changes will cause the axial force of the equipment rotor to increase significantly. At present, the main way to improve its ability to withstand axial force is to increase the thrust surface diameter of the sliding thrust bearing. However, when the thrust surface diameter increases, the average linear velocity of the surface will also increase. Since the thrust bearing surface temperature is positively correlated with its linear velocity, the bearing thrust surface temperature will increase with the increase of linear velocity. When the temperature is high, it is not conducive to the normal operation of the thrust bearing. Since the thrust bearing balances the axial force of the entire rotor, once it is damaged, the rotor will move axially, causing serious damage to the equipment, which will greatly increase the loss of the enterprise. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a two-stage sliding thrust bearing structure and a method of use, thereby improving the ability of the equipment rotor to withstand axial forces.

[0004] The object of the present invention is achieved like this:

[0005] A two-stage sliding thrust bearing structure comprises a main shaft (6) and an equipment support housing (20); the shaft extension end of the main shaft (6) is stepped; a radial thrust bearing (17) is provided between the large diameter section of the shaft extension end of the main shaft (6) and the equipment support housing (20); the radial thrust bearing (17) is fixed on the equipment support housing (20); an inner thrust disc (10) is sleeved and fixed on the small diameter section of the shaft extension end of the main shaft (6); both end surfaces of the inner thrust disc (10) are thrust surfaces; an adapter ring (1) is fixed to the end of the equipment support housing (20); a thrust disc (10) is provided between the adapter ring (1) and the small diameter section of the shaft extension end of the main shaft (6); A thrust bearing (11) is fixed on the adapter ring (1), and the two end faces of the inner thrust disc (10) are slidably matched with the corresponding thrust faces of the radial thrust bearing (17) and the thrust bearing (11), and axial positioning is formed. An outer thrust disc (5) is fixed on the end face of the shaft extension of the main shaft (6), and the two end faces of the outer thrust disc (5) are thrust faces. A thrust bearing end cover (2) is fixed on the end face of the adapter ring (1), and the two end faces of the outer thrust disc (5) are slidably matched with the corresponding thrust faces of the thrust bearing (11) and the thrust bearing end cover (2), and axial positioning is formed.

[0006] When the main shaft axial force is outward, the thrust surface of the thrust bearing end cover (2) and the inner thrust surface of the thrust bearing (11) jointly bear the thrust. Conversely, when the main shaft axial force is inward, the outer thrust surface of the thrust bearing (11) and the thrust surface of the radial thrust bearing (17) jointly bear the thrust.

[0007] Preferably, the inner thrust disc (10) is fixed on the shaft extension end step of the main shaft (6).

[0008] Preferably, the adapter ring (1) comprises an upper half and a lower half, and the upper half and the lower half are fixed by screws.

[0009] Preferably, the radial bearing of the radial thrust bearing (17) is a sliding tilting pad bearing, the radial bearing of the radial thrust bearing (17) is in sliding engagement with the main shaft (6), and the thrust bearing of the radial thrust bearing (17) is fixed to the equipment support housing (20).

[0010] Preferably, the thrust surfaces of the thrust bearing end cover (2), the thrust bearing (11), and the radial thrust bearing (17) are oil wedge thrust surfaces, and the oil wedge thrust surfaces are used to form an oil film during operation;

[0011] An oil inlet hole is provided radially on the upper side of the equipment support housing (20), and an oil chamber three is provided between the radial thrust bearing (17) and the large diameter section of the shaft extension end of the main shaft (6). Lubricating oil lubricates and cools the radial bearing of the radial thrust bearing (17) through the oil inlet hole, and then enters the oil chamber three to lubricate and cool the thrust surface of the radial thrust bearing (17); an oil inlet hole is provided radially on the upper side of the adapter ring (1), and an oil chamber two is provided between the thrust bearing (11) and the small diameter section of the shaft extension end of the main shaft (6). Lubricating oil enters the oil chamber two through the oil inlet hole to lubricate and cool the thrust surfaces at both ends of the thrust bearing (11); an oil inlet hole three is provided at the axial center of the thrust bearing end cover (2), and an oil chamber one is provided between the thrust bearing end cover (2) and the outer thrust plate (5). Lubricating oil enters the oil chamber one through the oil inlet hole three to lubricate and cool the thrust surface of the thrust bearing end cover (2).

[0012] Preferably, the thrust surface of the oil wedge is formed by spraying Babbitt alloy material.

[0013] Preferably, it also includes an inner thrust disc axial displacement sensor (3), an outer thrust disc axial displacement sensor (4), a thrust bearing end cover temperature sensor (9), a thrust bearing outer thrust surface temperature sensor (14), a thrust bearing inner thrust surface temperature sensor (15), and a radial thrust bearing thrust surface temperature sensor (18), wherein the inner thrust disc axial displacement sensor (3) monitors the axial displacement of the inner thrust disc (10), and the outer thrust disc axial displacement sensor (4) monitors the axial displacement of the outer thrust disc (5); the thrust bearing end cover temperature sensor (9) monitors the thrust surface temperature of the thrust bearing end cover (2), the thrust bearing outer thrust surface temperature sensor (14) monitors the outer thrust surface temperature of the thrust bearing (11), the thrust bearing inner thrust surface temperature sensor (15) monitors the inner thrust surface temperature of the thrust bearing (11), and the radial thrust bearing thrust surface temperature sensor (18) monitors the thrust surface temperature of the radial thrust bearing (17).

[0014] A method for using a two-stage sliding thrust bearing structure to adjust thrust clearance:

[0015] During assembly, the radial thrust bearing (17) is sleeved on the main shaft (6), the radial thrust bearing (17) is fixedly connected to the equipment support housing (20), the inner thrust plate (10) is fixedly installed to the main shaft, the lower half of the adapter ring (1) is fixedly installed to the equipment support housing (20), the thrust bearing (11) is fixedly installed to the lower half of the adapter ring (1), the outer thrust plate (5) is fixedly installed to the main shaft, and the thrust bearing end cover (2) is fixedly installed to the lower half of the adapter ring (1);

[0016] Push the main shaft to the outermost end and use a feeler gauge to check the clearance value L1 between the thrust surface of the thrust bearing end cover (2) and the outer thrust surface of the outer thrust disc (5), the clearance value L2 between the inner thrust surface of the outer thrust disc (5) and the outer thrust surface of the thrust bearing (11), the clearance value L3 between the inner thrust surface of the thrust bearing (11) and the outer thrust surface of the inner thrust disc (10), and the clearance value L4 between the inner thrust surface of the inner thrust disc (10) and the thrust surface of the radial thrust bearing (17). If the measured values ​​do not meet the conditions of L1=L3=0 and L2=L4, use an adjusting shim to adjust the axial position of the thrust bearing end cover (2), the outer thrust disc (5), the inner thrust disc (10), the thrust bearing (11) and the radial thrust bearing (17) until the conditions of L1=L3=0 and L2=L4 are met; then install the upper half of the adapter ring (1).

[0017] Preferably, the values ​​of L2 and L4 are between 0.1 mm and 0.3 mm.

[0018] Preferably, operation monitoring and fault diagnosis:

[0019] During operation, if the inner thrust disc axial displacement sensor (3) detects that the displacement of the inner thrust disc (10) is greater than the installation value L2 / L4, and the temperature of the radial thrust bearing thrust surface temperature sensor (18) rises and exceeds the alarm value, it is judged that the thrust surface of the radial thrust bearing (17) may be damaged by friction, and it is necessary to stop the machine for inspection; if the inner thrust disc axial displacement sensor (3) detects that the displacement of the inner thrust disc (10) is greater than the installation value L2 / L4, and the temperature of the thrust bearing inner thrust surface temperature sensor (15) rises and exceeds the alarm value, it is judged that the inner thrust surface of the thrust bearing (11) may be damaged by friction, The machine needs to be stopped for inspection; if the outer thrust disc axial displacement sensor (4) detects that the displacement of the outer thrust disc (5) is greater than the installation value L2 / L4, and the temperature of the thrust bearing outer thrust surface temperature sensor (14) rises and exceeds the alarm value, it is judged that the outer thrust surface of the thrust bearing (11) may be damaged by friction, and the machine needs to be stopped for inspection; if the outer thrust disc axial displacement sensor (4) detects that the displacement of the thrust disc is greater than the installation value L2 / L4, and the temperature of the thrust bearing end cover temperature sensor (9) rises and exceeds the alarm value, it is judged that the inner thrust surface of the thrust bearing (11) may be damaged by friction, and the machine needs to be stopped for inspection.

[0020] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0021] The present invention increases the number of sliding thrust bearings, controls the size of the assembly clearance of the thrust surfaces of the thrust bearings, and uses operation monitoring and fault judgment methods to further improve the ability of the equipment rotor to withstand axial forces, achieve uniform force on each thrust surface, and monitor the operation of the thrust bearings in real time, thereby reducing the risk of equipment loss in the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a two-stage sliding thrust bearing structure of the present invention.

[0023] Reference numerals

[0024] In the accompanying drawings, there are an adapter ring 1, a thrust bearing end cover 2, an inner thrust disc axial displacement sensor 3, an outer thrust disc axial displacement sensor 4, an outer thrust disc 5, a main shaft 6, a screw 7, a screw 8, a thrust bearing end cover temperature sensor 9, an inner thrust disc 10, a thrust bearing 11, a screw 12, a screw 13, a thrust bearing outer thrust surface temperature sensor 14, a thrust bearing inner thrust surface temperature sensor 15, a screw 16, a radial thrust bearing 17, a radial thrust bearing thrust surface temperature sensor 18, a screw 19, and an equipment support shell 20. DETAILED DESCRIPTION

[0025] See also Figure 1, which is a two-stage sliding thrust bearing structure. This structure can be referred to and extended to more than 3 levels according to actual needs. In order to facilitate installation, disassembly, inspection and subsequent maintenance, the present invention designs the thrust bearing structure on the side of the main shaft extension end. The thrust bearing can be quickly replaced without disassembling the equipment support housing and the main shaft. The adapter ring 1 is mainly used to connect the equipment support housing 20 and the thrust bearing sleeve, and is composed of an upper and lower halves. The thrust bearing end cover 2 acts as an oil barrier, and its right end face is the oil wedge thrust surface. During normal operation, an oil film of a certain thickness can be formed. To protect the rotor, the surface material is generally made of a softer material, Babbitt alloy. It can be re-sprayed after being worn out in abnormal circumstances. The thrust bearing end cover 2 body is provided with an axial displacement hole and a temperature sensor hole. The thrust bearing end cover 2 is connected to the adapter ring 1 by screws 13; the internal thrust The disc axial displacement sensor 3 monitors the axial displacement of the inner thrust disc 10, and the outer thrust disc axial displacement sensor 4 monitors the axial displacement of the outer thrust disc 5; the outer thrust disc 5 is connected to the main shaft 6 by screws 7, and the left and right sides of the outer thrust disc 5 are thrust surfaces, and the average surface roughness is generally less than 1.6; the main shaft 6 is a stepped main shaft; the thrust bearing end cover temperature sensor 9 monitors the thrust surface temperature of the thrust bearing end cover 2; the inner thrust disc 10 is connected to the main shaft 6 by screws 8, and the inner The left and right sides of the thrust disk 10 are thrust surfaces, and their average surface roughness is generally less than 1.6; the left and right end faces of the thrust bearing 11 are both oil wedge thrust surfaces, which can form a certain thickness of oil film during normal operation. To protect the rotor, the surface material is generally made of a softer material, Babbitt alloy. In case of abnormal wear, it can be re-sprayed. There is a temperature sensor hole on the body, which is connected to the adapter ring 1 by screws 12; the thrust bearing outer thrust surface temperature sensor 14 monitors the temperature of the left thrust surface of the thrust bearing 11, and the thrust bearing inner thrust surface temperature sensor 15 monitors the temperature of the right thrust surface of the thrust bearing 11; the radial thrust bearing 17 plays a radial support and bears a certain axial thrust. The radial bearing is a sliding tilting pad bearing, and the left end face is an oil wedge thrust surface. In normal operation, a certain thickness of oil film can be formed. To protect the rotor, the surface material is generally made of a softer material, Babbitt alloy. In case of abnormal wear, it can be re-sprayed. There is a temperature sensor hole on the body, which is connected to the equipment support housing 20 by screws 16. The relative distances between the thrust bearing end cover 2, the outer thrust disc 5, the inner thrust disc 10, the thrust bearing 11 and the radial thrust bearing 17 can be adjusted by adjusting the gaskets.

[0026] 1. Assembly and adjustment of thrust clearance

[0027] The radial thrust bearing 17 is sleeved on the main shaft 6 and fixedly connected to the equipment support housing 20 with screws 16; the inner thrust plate 10 is installed to the main shaft and fixed with screws 8; the lower half of the adapter ring 1 is installed and fixed with screws 19; then the thrust bearing 11, outer thrust plate 5 and thrust bearing end cover 2 are installed in sequence. After each part is installed, it needs to be tightened with screws. Forcefully push the main shaft to the left. Use a feeler gauge to check the clearances (L1) between the thrust bearing end cap 2 and the left end face of the outer thrust disc 5, (L2) between the right end face of the outer thrust disc 5 and the left end face of the thrust bearing 11, (L3) between the right end face of the thrust bearing 11 and the left end face of the inner thrust disc 10, and (L4) between the right end face of the inner thrust disc 10 and the left end face of the radial thrust bearing 17. L1 should equal L3 = 0, and L2 = L4 (the actual values ​​of L2 and L4 depend on the unit design requirements, generally ranging from 0.1mm to 0.3mm). If the measured values ​​do not meet the requirements of L1 = L3 = 0 and L2 = L4, use adjustment shims to adjust the relative distances between the thrust bearing end cap 2, outer thrust disc 5, inner thrust disc 10, thrust bearing 11, and radial thrust bearing 17 until the requirements of L1 = L3 = 0 and L2 = L4 are met. Then, install the upper half of adapter ring 1. After the above work is completed, the assembly is completed.

[0028] 2. Operation monitoring and fault diagnosis

[0029] Sufficient lubricating oil is constantly introduced through oil inlet holes 1, 2, and 3 to lubricate and cool the bearings. Lubricating oil enters oil chamber 3 through oil inlet hole 1 to lubricate the pads and left thrust surface of radial thrust bearing 17. Lubricating oil enters oil chamber 2 through oil inlet hole 2 to lubricate the left and right thrust surfaces of thrust bearing 11. Lubricating oil enters oil chamber 1 through oil inlet hole 3 to lubricate the right thrust surface of thrust bearing end cap 2. When the main shaft axial force is to the left, the right thrust surface of thrust bearing end cap 2 and the right thrust surface of thrust bearing 11 jointly bear the thrust. Conversely, when the main shaft axial force is to the right, the left thrust surface of thrust bearing 11 and the left thrust surface of radial thrust bearing 17 jointly bear the thrust. The simultaneous bearing of thrust by both thrust surfaces significantly improves their load-bearing capacity compared to a single surface. During operation, if the thrust plate displacement detected by the inner thrust plate axial displacement sensor 3 is greater than the installation value L2 or L4, and the temperature of the radial thrust bearing thrust surface temperature sensor 18 suddenly rises sharply and exceeds the alarm value (>85°C), it can be judged that the left thrust surface of the radial thrust bearing 17 may be damaged by friction, and it is necessary to stop the machine for inspection; if the thrust plate displacement detected by the inner thrust plate axial displacement sensor 3 is greater than the installation value L2 or L4, and the temperature of the thrust bearing inner thrust surface temperature sensor 15 suddenly rises sharply and exceeds the alarm value (>85°C), it can be judged that the right thrust surface of the thrust bearing 11 may be damaged by friction, and it is necessary to stop the machine for inspection. Stop the machine for inspection; if the thrust plate displacement detected by the outer thrust plate axial displacement sensor 4 is greater than the installation value L2 or L4, and the temperature of the thrust surface temperature sensor 14 of the thrust bearing suddenly rises sharply and exceeds the alarm value (>85°C), it can be judged that the left thrust surface of the thrust bearing 11 may be damaged by friction, and the machine needs to be stopped for inspection; if the thrust plate displacement detected by the outer thrust plate axial displacement sensor 4 is greater than the installation value L2 / L4, and the temperature of the thrust bearing end cover temperature sensor 9 suddenly rises sharply and exceeds the alarm value (>85°C), it can be judged that the right thrust surface of the thrust bearing 11 may be damaged by friction, and the machine needs to be stopped for inspection.

[0030] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A method for using a two-stage sliding thrust bearing structure, characterized in that: The two-stage sliding thrust bearing structure comprises a main shaft (6) and an equipment support housing (20). The shaft extension end of the main shaft (6) is stepped. A radial thrust bearing (17) is provided between the large diameter section of the shaft extension end of the main shaft (6) and the equipment support housing (20). The radial thrust bearing (17) is fixed on the equipment support housing (20). The small diameter section of the shaft extension end of the main shaft (6) is sleeved and fixed with an inner thrust disc (10). The two end surfaces of the inner thrust disc (10) are thrust surfaces. An adapter ring (1) is fixed at the end of the equipment support housing (20). A thrust disc (1) is provided between the adapter ring (1) and the small diameter section of the shaft extension end of the main shaft (6). Bearing (11), the thrust bearing (11) is fixed on the adapter ring (1), the two end faces of the inner thrust disc (10) are slidably matched with the corresponding thrust faces of the radial thrust bearing (17) and the thrust bearing (11), and axial positioning is formed; an outer thrust disc (5) is fixed on the end face of the shaft extension of the main shaft (6), the two end faces of the outer thrust disc (5) are thrust faces, and a thrust bearing end cover (2) is fixed on the end face of the adapter ring (1), the two end faces of the outer thrust disc (5) are slidably matched with the corresponding thrust faces of the thrust bearing (11) and the thrust bearing end cover (2), and axial positioning is formed; When the main shaft axial force is outward, the thrust surface of the thrust bearing end cover (2) and the inner thrust surface of the thrust bearing (11) jointly bear the thrust; when the main shaft axial force is inward, the outer thrust surface of the thrust bearing (11) and the thrust surface of the radial thrust bearing (17) jointly bear the thrust; The adapter ring (1) comprises an upper half and a lower half, and the upper half and the lower half are fixed by screws; The radial bearing of the radial thrust bearing (17) is a sliding tilting pad bearing, the radial bearing of the radial thrust bearing (17) is in sliding fit with the main shaft (6), and the thrust bearing of the radial thrust bearing (17) is fixed on the equipment support housing (20); The thrust surfaces of the thrust bearing end cover (2), the thrust bearing (11), and the radial thrust bearing (17) are oil wedge thrust surfaces, and the oil wedge thrust surfaces are used to form an oil film during operation; An oil inlet hole 1 is provided radially on the upper surface of the equipment support housing (20), and an oil chamber 3 is provided between the radial thrust bearing (17) and the large diameter section of the shaft extension end of the main shaft (6). Lubricating oil lubricates and cools the radial bearings of the radial thrust bearing (17) through the oil inlet hole, and then enters the oil chamber 3 to lubricate and cool the thrust surface of the radial thrust bearing (17); an oil inlet hole 2 is provided radially on the upper surface of the adapter ring (1), and an oil chamber 2 is provided between the thrust bearing (11) and the small diameter section of the shaft extension end of the main shaft (6). Lubricating oil enters the oil chamber 2 through the oil inlet hole 2 to lubricate and cool the thrust surfaces at both ends of the thrust bearing (11); an oil inlet hole 3 is provided at the axial center of the thrust bearing end cover (2), and an oil chamber 1 is provided between the thrust bearing end cover (2) and the outer thrust plate (5). Lubricating oil enters the oil chamber 1 through the oil inlet hole 3 to lubricate and cool the thrust surface of the thrust bearing end cover (2); It also includes an inner thrust disc axial displacement sensor (3), an outer thrust disc axial displacement sensor (4), a thrust bearing end cover temperature sensor (9), a thrust bearing outer thrust surface temperature sensor (14), a thrust bearing inner thrust surface temperature sensor (15), and a radial thrust bearing thrust surface temperature sensor (18). The inner thrust disc axial displacement sensor (3) monitors the axial displacement of the inner thrust disc (10), and the outer thrust disc axial displacement sensor (4) monitors the axial displacement of the outer thrust disc (5); the thrust bearing end cover temperature sensor (9) monitors the thrust surface temperature of the thrust bearing end cover (2), the thrust bearing outer thrust surface temperature sensor (14) monitors the outer thrust surface temperature of the thrust bearing (11), the thrust bearing inner thrust surface temperature sensor (15) monitors the inner thrust surface temperature of the thrust bearing (11), and the radial thrust bearing thrust surface temperature sensor (18) monitors the thrust surface temperature of the radial thrust bearing (17); Instructions include: Adjusting the thrust clearance: During assembly, the radial thrust bearing (17) is sleeved on the main shaft (6), the radial thrust bearing (17) is fixedly connected to the equipment support housing (20), the inner thrust plate (10) is fixedly installed to the main shaft, the lower half of the adapter ring (1) is fixedly installed to the equipment support housing (20), the thrust bearing (11) is fixedly installed to the lower half of the adapter ring (1), the outer thrust plate (5) is fixedly installed to the main shaft, and the thrust bearing end cover (2) is fixedly installed to the lower half of the adapter ring (1); Push the main shaft to the outermost end and use a feeler gauge to check the clearance value L1 between the thrust surface of the thrust bearing end cover (2) and the outer thrust surface of the outer thrust disc (5), the clearance value L2 between the inner thrust surface of the outer thrust disc (5) and the outer thrust surface of the thrust bearing (11), the clearance value L3 between the inner thrust surface of the thrust bearing (11) and the outer thrust surface of the inner thrust disc (10), and the clearance value L4 between the inner thrust surface of the inner thrust disc (10) and the thrust surface of the radial thrust bearing (17). If the measured values ​​do not satisfy L1=L3=0 and L2=L4, use an adjusting shim to adjust the axial position of the thrust bearing end cover (2), the outer thrust disc (5), the inner thrust disc (10), the thrust bearing (11) and the radial thrust bearing (17) until L1=L3=0 and L2=L4 are satisfied; then install the upper half of the adapter ring (1); Operation monitoring and fault diagnosis: During operation, if the inner thrust disc axial displacement sensor (3) detects that the displacement of the inner thrust disc (10) is greater than the installation value L2 / L4, and the temperature of the radial thrust bearing thrust surface temperature sensor (18) rises and exceeds the alarm value, it is judged that the thrust surface of the radial thrust bearing (17) may be damaged by friction, and it is necessary to stop the machine for inspection; if the inner thrust disc axial displacement sensor (3) detects that the displacement of the inner thrust disc (10) is greater than the installation value L2 / L4, and the temperature of the thrust bearing inner thrust surface temperature sensor (15) rises and exceeds the alarm value, it is judged that the inner thrust surface of the thrust bearing (11) may be damaged by friction, The machine needs to be stopped for inspection; if the outer thrust disc axial displacement sensor (4) detects that the displacement of the outer thrust disc (5) is greater than the installation value L2 / L4, and the temperature of the thrust bearing outer thrust surface temperature sensor (14) rises and exceeds the alarm value, it is judged that the outer thrust surface of the thrust bearing (11) may be damaged by friction, and the machine needs to be stopped for inspection; if the outer thrust disc axial displacement sensor (4) detects that the displacement of the thrust disc is greater than the installation value L2 / L4, and the temperature of the thrust bearing end cover temperature sensor (9) rises and exceeds the alarm value, it is judged that the inner thrust surface of the thrust bearing (11) may be damaged by friction, and the machine needs to be stopped for inspection.

2. The method for using a two-stage sliding thrust bearing structure according to claim 1, characterized in that: The inner thrust plate (10) is fixed on the shaft extension end step of the main shaft (6).

3. The method for using a two-stage sliding thrust bearing structure according to claim 1, characterized in that: The thrust surface of the oil wedge is formed by spraying Babbitt alloy material.

4. The method for using a two-stage sliding thrust bearing structure according to claim 1, characterized in that: The values ​​of L2 and L4 are between 0.1mm and 0.3mm.

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