A roughing main motor thrust device
By using a high-pressure oil inlet pipe to supply high-pressure oil in the thrust device of the main motor of the roughing mill, the gap between the thrust bearing and the thrust plate is maintained, which solves the problem of thrust bearing burn-out caused by axial thrust and achieves stable operation and improved safety of the thrust bearing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- DONGFANG ELECTRIC (DEYANG) MOTOR TECH CO LTD
- Filing Date
- 2025-04-30
- Publication Date
- 2026-08-04
AI Technical Summary
During the rolling process, the thrust bearing of the main motor in the roughing mill is prone to overheating due to axial thrust, which can cause frequent alarms and interlock shutdowns, and even burn out the thrust bearing, affecting the normal rolling of steel plates.
The system uses a high-pressure oil inlet pipe to supply 15 MPa high-pressure oil. Through the gap between the thrust bearing and the thrust plate, the high-pressure oil provides a reverse thrust to the thrust bearing under axial pressure, maintaining the gap between the thrust bearing and the thrust plate and preventing contact. The design includes a rotating shaft, radial bearing end plate, vibration damping seat, thrust bearing, thrust plate and high-pressure oil inlet system.
It effectively avoids the burning of thrust bearings, promotes the long-term stable operation of thrust bearings, reduces vibration, noise and temperature rise, and meets the long-term stable safety requirements of thrust bearings. It has the characteristics of simple structure and strong feasibility.
Smart Images
Figure CN120414982B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of roughing mill main motor technology, and more specifically to the field of a thrust device for a roughing mill main motor. Background Technology
[0002] In order to overcome the axial thrust from the rolling of steel plates in both directions, the main motor of the roughing mill is equipped with a thrust bearing (including thrust pads) with a thrust-resistant function. Its axial load is usually: ±500kN under normal working conditions, ±1000kN under frequent overload, and ±5000kN under maximum accident overload.
[0003] When the main motor of the roughing mill is rolling odd passes, the rotor moves toward the drive side, and the thrust bearing on the drive side bears the corresponding axial thrust; when rolling even passes, the rotor of the main motor moves toward the non-drive side, and the thrust bearing on the non-drive side bears the corresponding axial thrust.
[0004] During the rolling process, the thrust bearing of the main motor of the roughing mill may experience a momentary temperature of 100°C or higher (the thrust bearing alarm setting temperature is 60°C, and the interlock shutdown setting temperature is 90°C). This causes frequent alarms and interlock shutdowns of the main motor, and in severe cases, even frequent burnout of the thrust bearing, affecting the normal rolling of steel plates and causing economic losses.
[0005] The burnout of the thrust bearing of the main motor in the roughing mill is caused by internal factors such as the structure and manufacturing of the thrust bearing, as well as external factors such as the operating conditions of the equipment, the rolling process, and the heating process. Summary of the Invention
[0006] The purpose of this invention is to solve the technical problem that the thrust bearing of the main motor of a roughing mill is easily burned out. This invention provides a thrust device for the main motor of a roughing mill.
[0007] To achieve the above objectives, the present invention specifically adopts the following technical solution: The present invention provides a thrust device for a roughing mill main motor, comprising a rotating shaft, a first radial bearing end plate, a vibration damping seat, a second radial bearing end plate, a shaft extension end thrust pad, a non-shaft extension end thrust pad, a thrust disc, and a transition tube; The shaft extension end thrust pad is mounted on the first radial bearing end plate, and the non-shaft extension end thrust pad is mounted on the second radial bearing end plate. The thrust disc is sleeved on the rotating shaft, and the vibration damping seat is located between the edges of the first radial bearing end plate and the second radial bearing end plate. The first radial bearing end plate, the second radial bearing end plate, and the vibration damping seat form a sealed cavity. The first radial bearing end plate is detachably connected to the shaft extension end thrust pad, and the non-shaft extension end thrust pad is detachably connected to the second radial bearing end plate. The thrust disc is detachably fixed on the rotating shaft. There are buffer gaps between the shaft extension end thrust pad, the non-shaft extension end thrust pad, and the thrust disc, which communicate with the sealed cavity. It also includes two high-pressure oil inlet pipes, which are connected to the internal pipes of the first radial bearing end plate and the second radial bearing end plate, respectively. The internal pipe of the first radial bearing end plate is connected to the internal pipe of the shaft extension end thrust bearing through a transition pipe. The internal pipe of the second radial bearing end plate is connected to the internal pipe of the non-shaft extension end thrust bearing through a transition pipe. The internal pipes of the shaft extension end thrust bearing and the non-shaft extension end thrust bearing are connected to the sealing cavity through corresponding buffer gaps. The sealing cavity is connected to the oil tank and the oil return system, respectively.
[0008] Specifically, each end plate is provided with an end plate oil inlet channel connected to the high pressure oil inlet pipe, each thrust bearing is provided with a thrust bearing oil passage, the end plate oil inlet channel and the thrust bearing oil passage are connected through a transition pipe, each thrust bearing has an annular sealing groove on the bearing thrust surface that is connected to the thrust bearing oil passage, and each thrust bearing has multiple oil outlet pipe assemblies axially arranged on the side near the thrust plate that are connected to the sealing groove. The external system lubricating oil enters the end plate oil inlet channel inside the end plate through the high-pressure oil inlet pipe, then enters the thrust bearing oil passage through the guide pipe, then enters the sealing groove, and finally enters the sealing cavity through the oil outlet pipeline assembly. The sealing cavity is connected to the oil tank, and the oil tank is connected to the return oil system.
[0009] Because there is a gap of about 3mm between the thrust bearing and the thrust plate during installation, they cannot make contact. In existing technology, oil is introduced between the thrust bearing and the thrust plate using ordinary hydraulic pressure. When the thrust bearing is subjected to axial thrust, the oil between the thrust bearing and the thrust plate will be discharged into the sealing cavity, causing the thrust bearing and the thrust plate to come into contact, which will lead to the burnout of the thrust bearing. This solution introduces high-pressure oil of 15Mpa through a high-pressure oil inlet pipe. When the thrust bearing and the thrust plate are subjected to axial pressure, the oil can provide a reverse thrust to the thrust bearing, so that there is always a gap between the thrust bearing and the thrust plate, thus avoiding the burnout of the thrust bearing.
[0010] In one embodiment, a dividing component is provided in the middle of the sealing cavity, which divides the sealing cavity into a first sealing cavity and a second sealing cavity. The first radial bearing end plate and the second radial bearing end plate are symmetrically arranged and have the same structure. The first radial bearing end plate has a radial threaded hole on its outer circumference and a bearing end plate radial hole inside the first radial bearing end plate. The first radial bearing end plate has an axial threaded hole on its inner surface. The radial threaded hole is connected to the outer end of the bearing end plate radial hole, and the inner end of the bearing end plate radial hole is connected to the axial threaded hole.
[0011] Specifically, the segmentation assembly includes a pressure ring fixed on the outer periphery of the thrust disc and a sealing ring fixed on the inner wall of the bearing housing in the circumferential direction. The pressure ring and the sealing ring are fixed by bolt assemblies evenly distributed around the circumference.
[0012] It also includes a balancing hydraulic system for connecting the first sealing cavity and the second sealing cavity, with the two bearing balancing oil holes connected to both ends of the balancing hydraulic system.
[0013] In one embodiment, the thrust bearing at the shaft extension end and the thrust bearing at the non-shaft extension end are symmetrically arranged and have the same structure. The thrust bearing at the shaft extension end has a threaded hole on its circumferential outer surface and a radial hole inside. The thrust bearing surface of the thrust bearing at the shaft extension end has an axial hole, an oil outlet hole, and an oil guide groove. The top of the radial hole communicates with the threaded hole, and the bottom of the radial hole communicates with the axial hole. The side of the thrust bearing at the shaft extension end away from the thrust bearing surface has an annular sealing groove that communicates with the axial hole through a closed space. One end of the oil outlet hole communicates with the sealing groove, and the other end penetrates the thrust bearing surface of the thrust bearing at the shaft extension end.
[0014] In one embodiment, the axial threaded hole penetrates the side of the first radial bearing end plate located near the thrust bearing end near the shaft extension end.
[0015] In one embodiment, the axial threaded hole and the threaded hole are radially offset at an angle for installing the hose.
[0016] In one embodiment, the thrust pad at the shaft extension end and the thrust pad at the non-shaft extension end are both circular structures. The system also includes a fluid sealing plate, which is also circular. There are two fluid sealing plates, which are welded to the sealing grooves of the thrust pad at the shaft extension end and the non-shaft extension end, respectively, to form two closed spaces.
[0017] In one embodiment, the number of oil outlet holes and oil guide grooves are the same, and they are circumferentially distributed on the thrust surface of the bearing. The oil outlet holes in the same group are located in the oil guide grooves, and each oil guide groove is one of circular, elliptical or annular. The enclosed space is connected to the oil guide grooves through the circumferentially distributed oil outlet holes.
[0018] In one embodiment, there are two transition pipes; each transition pipe is a steel pipe with external threads at both ends and multiple planes circumferentially present in the middle part. For the first radial bearing end plate, a transition tube is connected to the axial threaded hole of the first radial bearing end plate, and the other end passes through the connecting hole of the shaft extension end thrust bearing and extends partially into the sealing cavity. For the second radial bearing end plate, another transition tube is connected to the axial threaded hole of the second radial bearing end plate, and the other end passes through the connection hole of the non-shaft extension end thrust bearing and extends partially into the sealing cavity.
[0019] In one embodiment, the system also includes two hoses, each hose having an external thread at one end and an internal thread at the other end, with the two ends at 90° to each other. For the thrust pad at the shaft extension end, one end of the hose with an internal thread is connected to the external thread of a transition tube, and the other end of the hose with an external thread is connected to the threaded hole of the thrust pad at the shaft extension end. For the non-shaft extension end thrust pad, one end of the hose's internal thread is connected to the external thread of another transition tube, and the other end of the hose's external thread is connected to the threaded hole of the non-shaft extension end thrust pad.
[0020] In one embodiment, it also includes adjusting shims, and there are multiple adjusting shims; for the shaft extension end thrust pad, a portion of the adjusting shims are located between the first radial bearing end plate and the shaft extension end thrust pad, and are fixed by the connecting bolts between the first radial bearing end plate and the shaft extension end thrust pad; For the non-shaft extension end thrust pad, another part of the adjusting pad is located between the second radial bearing end plate and the non-shaft extension end thrust pad, and is fixed by the connecting bolts between the second radial bearing end plate and the non-shaft extension end thrust pad; In addition to the holes for connecting bolts, each adjusting plate has multiple holes arranged circumferentially for the passage of transition pipes.
[0021] Specifically, the adjusting shim is a thin plate. In order to adjust the gap between the first radial bearing end plate and the shaft extension end thrust pad to a gap of 3mm, the gap between the second radial bearing end plate and the non-shaft extension end thrust pad can also be adjusted to a gap of 3mm.
[0022] The beneficial effects of this invention are as follows: 1. After the high-pressure oil of 15 MPa is added through the high-pressure oil inlet pipe, the oil between the thrust bearing and the thrust plate will give the thrust bearing a reverse thrust when subjected to axial pressure, so that there is always a gap between the thrust bearing and the thrust plate, thus avoiding the burning of the thrust bearing.
[0023] 2. This invention provides a thrust device for a roughing mill main motor, which overcomes the bearing failure problem caused by the above factors, promotes the long-term and stable operation of the thrust bearing, and has the characteristics of simple structure and strong feasibility.
[0024] 3. This invention can withstand large axial forces by adjusting the oil inlet flow rate, meeting the requirements for long-term, stable and safe operation of thrust bearings, and has the characteristics of low vibration, low noise, low temperature rise, simple structure and strong feasibility. Attached Figure Description
[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the structure of a thrust device for a roughing mill main motor according to the present invention; Figure 2 This is a schematic diagram of the structure of the first radial bearing end plate or the second radial bearing end plate.
[0027] Figure 3 This is a partial structural diagram of a type of thrust bearing.
[0028] Figure 4 yes Figure 3 Schematic diagram of the structure at MM.
[0029] Figure 5 This is a partial structural diagram of another form of thrust bearing.
[0030] Figure 6 yes Figure 5 A structural diagram from another side.
[0031] Figure 7 This is a schematic diagram of the transition tube.
[0032] Reference numerals: 1-Shaft; 2-Radial bearing end plate; 3-Vibration damping seat; 4-End plate; 5-Pressure ring; 6-Sealing ring; 7-Shaft extension end thrust bearing; 8-Non-shaft extension end thrust bearing; 9-Thrust disc; 10-Oil seal; 11-Transition pipe; 13-Oil inlet pipe; 14-Adjusting shim; 15-Fluid sealing plate; 201-Circumferential outer surface; 202-Radial threaded hole; 203-Bearing end plate radial hole; 204-Inner surface; 205-Axial threaded hole; 701-Circumferential outer surface; 702-Threaded hole; 703-Thrust bearing radial hole; 704-Thrust surface; 705-Axial hole; 706-Oil outlet; 707-Oil guide groove; 801-Sealing groove; 802-Enclosed space; 803-Connecting hole; 110-External thread; 111-Flat surface. Detailed Implementation
[0033] To make the technical problems, technical solutions, and technical effects of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.
[0035] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0036] In the description of the embodiments of the present invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.
[0037] Example 1 like Figures 1 to 7 As shown, this embodiment provides a thrust device for a roughing mill main motor, including a rotating shaft 1, a first radial bearing end plate 2, a vibration damping seat 3, a second radial bearing end plate 4, a shaft extension end thrust pad 7, a non-shaft extension end thrust pad 8, a thrust disc 9, and a transition tube 11. The shaft extension end thrust pad 7 is installed on the first radial bearing end plate 2, the non-shaft extension end thrust pad 8 is installed on the second radial bearing end plate 4, the thrust disk 9 is sleeved on the rotating shaft 1, and the vibration damping seat 3 is located between the edges of the first radial bearing end plate 2 and the second radial bearing end plate 4; the first radial bearing end plate 2, the second radial bearing end plate 4 and the vibration damping seat 3 form a sealed cavity, the first radial bearing end plate 2 and the shaft extension end thrust pad 7 are detachably connected, the non-shaft extension end thrust pad 8 and the second radial bearing end plate 4 are detachably connected, the thrust disk 9 is detachably fixed on the rotating shaft 1, and there is a buffer gap between the shaft extension end thrust pad 7 and the non-shaft extension end thrust pad 8 and the thrust disk 9 that communicates with the sealed cavity; It also includes two high-pressure oil inlet pipes 13, which are connected to the internal pipes of the first radial bearing end plate 2 and the second radial bearing end plate 4, respectively. The internal pipe of the first radial bearing end plate 2 is connected to the internal pipe of the shaft extension end thrust bearing 7 through the transition pipe 11. The internal pipe of the second radial bearing end plate 4 is connected to the internal pipe of the non-shaft extension end thrust bearing 8 through the transition pipe 11. The internal pipes of the shaft extension end thrust bearing 7 and the non-shaft extension end thrust bearing 8 are connected to the sealing cavity through corresponding buffer gaps. The sealing cavity is connected to the oil tank and the oil return system, respectively.
[0038] Specifically, each end plate is provided with an end plate oil inlet channel connected to the high pressure oil inlet pipe 13, each thrust bearing is provided with a thrust bearing oil passage, the end plate oil inlet channel and the thrust bearing oil passage are connected through a transition pipe 11, each thrust bearing has an annular sealing groove on its bearing thrust surface that is connected to the thrust bearing oil passage, and each thrust bearing has multiple oil outlet pipe assemblies axially arranged on the side near the thrust plate that are connected to the sealing groove. The external system lubricating oil enters the end plate oil inlet channel inside the end plate through the high-pressure oil inlet pipe, then enters the thrust bearing oil passage through the guide pipe, then enters the sealing groove, and finally enters the sealing cavity through the oil outlet pipeline assembly. The sealing cavity is connected to the oil tank, and the oil tank is connected to the return oil system.
[0039] Example 2 This embodiment is a further optimization based on Embodiment 1, specifically: A dividing component is provided in the middle of the sealing cavity, which divides the sealing cavity into a first sealing cavity and a second sealing cavity; The first radial bearing end plate 2 and the second radial bearing end plate 4 are symmetrically arranged and have the same structure. The circumferential outer surface 201 of the first radial bearing end plate 2 is provided with a radial threaded hole 202. The first radial bearing end plate 2 is provided with a bearing end plate radial hole 203 inside. The inner surface 204 of the first radial bearing end plate 2 is provided with an axial threaded hole 205. The radial threaded hole 202 communicates with the outer end of the bearing end plate radial hole 203, and the inner end of the bearing end plate radial hole 203 communicates with the axial threaded hole 205.
[0040] Specifically, the segmentation assembly includes a pressure ring 5 fixed on the outer periphery of the thrust plate and a sealing ring 6 fixed on the inner wall of the bearing housing in the circumferential direction. The pressure ring 5 and the sealing ring 6 are fixed by bolt assemblies evenly distributed around the circumference.
[0041] It also includes a balancing hydraulic system for connecting the first sealing cavity and the second sealing cavity, with the two bearing balancing oil holes connected to both ends of the balancing hydraulic system.
[0042] Example 3 This embodiment is a further optimization based on embodiment 2, specifically: The thrust bearing 7 at the shaft extension end and the thrust bearing 8 at the non-shaft extension end are symmetrically arranged and have the same structure. The outer circumferential surface 701 of the thrust bearing 7 at the shaft extension end is provided with a threaded hole 702. The interior of the thrust bearing 7 at the shaft extension end is provided with a radial hole 703. The bearing thrust surface 704 of the thrust bearing 7 at the shaft extension end is provided with an axial hole 705, an oil outlet 706, and an oil guide groove 707. The top of the radial hole 703 communicates with the threaded hole 702, and the bottom of the radial hole 703 communicates with the axial hole 705. The side of the thrust bearing 7 at the shaft extension end away from the bearing thrust surface 704 is provided with an annular sealing groove 801 that communicates with the axial hole 705 through a closed space 802. One end of the oil outlet 706 communicates with the sealing groove 801, and the other end passes through the bearing thrust surface 704 of the thrust bearing 7 at the shaft extension end.
[0043] The axial threaded hole 205 passes through the side of the first radial bearing end plate 2 located near the thrust bearing 7 at the shaft extension end.
[0044] The axial threaded hole 205 and the threaded hole 702 are radially offset at an angle for installing the hose.
[0045] Example 4 This embodiment is a further optimization based on embodiment 3, specifically: The shaft extension end thrust pad 7 and the non-shaft extension end thrust pad 8 are circular structures. It also includes a fluid sealing plate 15, which is circular. There are two fluid sealing plates 15. The two fluid sealing plates 15 are respectively welded to the sealing groove 801 of the shaft extension end thrust pad 7 and the sealing groove 801 of the non-shaft extension end thrust pad 8, forming two closed spaces 802 respectively.
[0046] The number of oil outlet holes 706 and the number of oil guide grooves 707 are the same, and they are distributed in a circular pattern on the thrust surface 704 of the bearing bush. The oil outlet holes 706 in the same group are located in the oil guide grooves 707. Each oil guide groove 707 is one of circular, elliptical or annular. The enclosed space 802 is connected to the oil guide grooves 707 through the circumferentially distributed oil outlet holes 706.
[0047] Example 5 This embodiment is a further optimization based on embodiment 4, specifically: There are two transition pipes 11; each transition pipe 11 is a steel pipe with external threads 110 at both ends and multiple planes 111 in the circumferential direction in the middle part. For the first radial bearing end plate 2, a transition tube 11 is connected to the axial threaded hole 205 of the first radial bearing end plate 2, and the other end passes through the connecting hole 803 of the shaft extension end thrust bearing 7 and extends partially into the sealing cavity. For the second radial bearing end plate 4, another transition tube 11 is connected to the axial threaded hole 205 of the second radial bearing end plate 4, and the other end passes through the connecting hole 803 of the non-shaft extension end thrust bearing 8 and extends partially into the sealing cavity.
[0048] It also includes hoses, two hoses in total, each hose has an external thread at one end and an internal thread at the other end, and the two ends are at 90° to each other; For the shaft extension end thrust pad 7, one end of the hose with an internal thread is connected to the external thread 110 of a transition tube 11, and the other end of the hose with an external thread is connected to the threaded hole 702 of the shaft extension end thrust pad 7. For the non-shaft extension end thrust pad 8, one end of the hose's internal thread is connected to the external thread 110 of another transition tube 11, and the other end of the hose's external thread is connected to the threaded hole 702 of the non-shaft extension end thrust pad 8.
[0049] Example 6 This embodiment is a further optimization based on embodiment 5, specifically: It also includes adjusting pads 14, and there are multiple adjusting pads 14; for the shaft extension end thrust pad 7, a portion of the adjusting pads 14 are located between the first radial bearing end plate 2 and the shaft extension end thrust pad 7, and are fixed by the connecting bolts between the first radial bearing end plate 2 and the shaft extension end thrust pad 7. For the non-shaft extension end thrust pad 8, another part of the adjusting pad 14 is located between the second radial bearing end plate 4 and the non-shaft extension end thrust pad 8, and is fixed by the connecting bolts between the second radial bearing end plate 4 and the non-shaft extension end thrust pad 8; In addition to the holes for connecting bolts, each adjusting plate 14 is provided with multiple holes around its circumference for the transition pipe 11 to pass through.
[0050] Specifically, the adjusting shim 14 is a thin plate. In order to adjust the gap between the first radial bearing end plate 2 and the shaft extension end thrust pad 7 to a gap of 3mm, the gap between the second radial bearing end plate 4 and the non-shaft extension end thrust pad 8 can also be adjusted to a gap of 3mm.
[0051] Because there is a gap of about 3mm between the thrust bearing and the thrust plate during installation, they cannot make contact. In existing technology, oil is introduced between the thrust bearing and the thrust plate using ordinary hydraulic pressure. When the thrust bearing is subjected to axial thrust, the oil between the thrust bearing and the thrust plate will be discharged into the sealing cavity, causing the thrust bearing and the thrust plate to come into contact, which will lead to the burnout of the thrust bearing. This solution introduces high-pressure oil of 15Mpa through a high-pressure oil inlet pipe. When the thrust bearing and the thrust plate are subjected to axial pressure, the oil can provide a reverse thrust to the thrust bearing, so that there is always a gap between the thrust bearing and the thrust plate, thus avoiding the burnout of the thrust bearing.
Claims
1. A thrust device for a roughing mill main motor, characterized in that, It includes a rotating shaft (1), a first radial bearing end plate (2), a vibration damping seat (3), a second radial bearing end plate (4), a shaft extension end thrust pad (7), a non-shaft extension end thrust pad (8), a thrust disc (9), and a transition tube (11). The shaft extension thrust pad (7) is mounted on the first radial bearing end plate (2), the non-shaft extension thrust pad (8) is mounted on the second radial bearing end plate (4), the thrust disk (9) is sleeved on the rotating shaft (1), and the vibration damping seat (3) is disposed between the edges of the first radial bearing end plate (2) and the second radial bearing end plate (4); the first radial bearing end plate (2), the second radial bearing end plate (4) and the vibration damping seat (3) form a sealed cavity, the first radial bearing end plate (2) and the shaft extension thrust pad (7) are detachably connected, the non-shaft extension thrust pad (8) and the second radial bearing end plate (4) are detachably connected, the thrust disk (9) is detachably fixed on the rotating shaft (1), and there is a buffer gap between the shaft extension thrust pad (7) and the non-shaft extension thrust pad (8) and the thrust disk (9) that communicates with the sealed cavity; It also includes two high-pressure oil inlet pipes (13), which are respectively connected to the internal pipes of the first radial bearing end plate (2) and the second radial bearing end plate (4). The internal pipe of the first radial bearing end plate (2) is connected to the internal pipe of the shaft extension end thrust pad (7) through the transition pipe (11), and the internal pipe of the second radial bearing end plate (4) is connected to the internal pipe of the non-shaft extension end thrust pad (8) through the transition pipe (11). The internal pipe of the shaft extension end thrust pad (7) and the internal pipe of the non-shaft extension end thrust pad (8) are connected to the sealing cavity through the corresponding buffer gap. The sealing cavity is connected to the oil tank and the return oil system respectively. A dividing component is provided in the middle of the sealing cavity, which divides the sealing cavity into a first sealing cavity and a second sealing cavity. The first radial bearing end plate (2) and the second radial bearing end plate (4) are symmetrically arranged and have the same structure. The first radial bearing end plate (2) has a radial threaded hole (202) on its circumferential outer circular surface (201). The first radial bearing end plate (2) has a bearing end plate radial hole (203) inside. The first radial bearing end plate (2) has an axial threaded hole (205) on its inner surface (204). The radial threaded hole (202) is connected to the outer end of the bearing end plate radial hole (203). The inner end of the bearing end plate radial hole (203) is connected to the axial threaded hole (205). The thrust bearing at the shaft extension end (7) and the thrust bearing at the non-shaft extension end (8) are symmetrically arranged and have the same structure. The circumferential outer surface (701) of the thrust bearing at the shaft extension end (7) is provided with a threaded hole (702). The interior of the thrust bearing at the shaft extension end (7) is provided with a radial hole (703). The bearing thrust surface (704) of the thrust bearing at the shaft extension end (7) is provided with an axial hole (705), an oil outlet hole (706), and an oil guide groove (707). The top of the radial hole (703) of the thrust bearing... The threaded hole (702) is connected to the threaded hole (702), and the bottom of the radial hole (703) of the thrust bearing is connected to the axial hole (705). The shaft extension end thrust bearing (7) is provided with an annular sealing groove (801) that communicates with the axial hole (705) through the closed space (802) on the side away from the bearing thrust surface (704). One end of the oil outlet hole (706) is connected to the sealing groove (801), and the other end passes through the bearing thrust surface (704) of the shaft extension end thrust bearing (7).
2. The thrust device for a roughing mill main motor according to claim 1, characterized in that, The axial threaded hole (205) passes through the side of the first radial bearing end plate (2) located near the side of the thrust bearing (7) at the shaft extension end.
3. A roughing main motor thrust device according to claim 2, characterized in that The axial threaded hole (205) and the threaded hole (702) are radially offset at an angle for installing the hose.
4. A roughing main motor thrust device according to claim 3, characterized in that The shaft extension end thrust pad (7) and the non-shaft extension end thrust pad (8) are circular structures, and also include a fluid sealing plate (15). The fluid sealing plate (15) is circular, and there are two fluid sealing plates (15). The two fluid sealing plates (15) are respectively welded to the sealing groove (801) of the shaft extension end thrust pad (7) and the sealing groove (801) of the non-shaft extension end thrust pad (8), forming two closed spaces (802) respectively.
5. A roughing main motor thrust device according to claim 4, characterized in that The number of oil outlet holes (706) is the same as the number of oil guide grooves (707), and they are distributed circumferentially on the bearing thrust surface (704). The oil outlet holes (706) in the same group are located in the oil guide grooves (707). Each oil guide groove (707) is one of circular, elliptical or annular. The enclosed space (802) is connected to the oil guide grooves (707) through the circumferentially distributed oil outlet holes (706).
6. The thrust device for a roughing mill main motor according to claim 5, characterized in that, The number of transition tubes (11) is two; each transition tube (11) is a steel pipe with external threads (110) at both ends and multiple planes (111) in the circumferential direction in the middle part. For the first radial bearing end plate (2), one of the transition tubes (11) is connected to the axial threaded hole (205) of the first radial bearing end plate (2), and the other end passes through the connecting hole (803) of the shaft extension thrust bearing (7) and extends partially into the sealing cavity; For the second radial bearing end plate (4), another transition tube (11) is connected to the axial threaded hole (205) of the second radial bearing end plate (4), and the other end passes through the connecting hole (803) of the non-shaft extension thrust pad (8) and extends partially into the sealing cavity.
7. A roughing main motor thrust device according to claim 6, characterized in that It also includes hoses, of which there are two, one end of which has an external thread and the other end has an internal thread, and the two ends are at 90° to each other; For the shaft extension end thrust pad (7), one end of the hose with an internal thread is connected to the external thread (110) of a transition tube (11), and one end of the hose with an external thread is connected to the threaded hole (702) of the shaft extension end thrust pad (7). For the non-shaft extension end thrust pad (8), one end of the internal thread of the hose is connected to the external thread (110) of the other transition tube (11), and one end of the external thread of the hose is connected to the threaded hole (702) of the non-shaft extension end thrust pad (8).
8. A roughing main motor thrust device according to claim 7, characterized in that It also includes adjusting pads (14), and the number of adjusting pads (14) is multiple; Regarding the shaft extension end thrust pad (7), a portion of the adjusting pad (14) is located between the first radial bearing end plate (2) and the shaft extension end thrust pad (7), and is fixed by the connecting bolts of the first radial bearing end plate (2) and the shaft extension end thrust pad (7); Regarding the non-shaft extension end thrust pad (8), another part of the adjusting pad (14) is located between the second radial bearing end plate (4) and the non-shaft extension end thrust pad (8), and is fixed by the connecting bolts of the second radial bearing end plate (4) and the non-shaft extension end thrust pad (8); In addition to the holes for connecting bolts, each of the adjusting pads (14) is provided with multiple holes arranged circumferentially for the transition tube (11) to pass through.