Sliding bearing with automatic centering function and centering method thereof

Abstract

The invention discloses a sliding bearing with an automatic centering function and a centering method thereof.The sliding bearing comprises a bearing seat and a shaft sleeve, two round hole grooves are vertically and symmetrically formed in the middle of the inner wall of the bearing seat, two cylinders are vertically and symmetrically arranged on the outer wall of the shaft sleeve, each cylinder is provided with an arc head, and the two cylinders are movably inserted into the two round hole grooves correspondingly; a gap is formed between the bearing seat and the shaft sleeve, the shaft sleeve can swing along the central axis of the two cylinders, and an electromagnet and a displacement sensor are further installed on the bearing seat. Through cooperation of the cylinders and the round hole grooves, the shaft sleeve can swing along the central axes of the two cylinders, in the rotating process of the rotating shaft, small-angle swing can be achieved, hard eccentric wear of the bearing bush is prevented, the swing position of the shaft sleeve is measured through the displacement sensor, after swing is finished, electromagnets at different positions are controlled to be started, the shaft sleeve is attracted to be aligned, and the bearing bush is prevented from being damaged. Therefore, the opening and closing consistency of the guide vanes is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of sliding bearings, and in particular to a sliding bearing with an automatic centering function and a centering method thereof. Background Art

[0002] The turbine is a core mechanical component in a hydropower generation system, and the movable guide vanes of the turbine's water guide mechanism are a key component of the turbine, primarily used to control the rate and direction of water flow entering the turbine. The angle of the movable guide vanes can be adjusted by rotating the internal rotating shaft of the guide vanes, thereby changing the speed and flow rate of the water flow, and thus adjusting the output power and efficiency of the turbine. To ensure smooth rotation of the guide vanes, sliding bearings are typically installed inside the guide vanes. However, in actual operation, due to external forces such as water flow, the rotating shaft inside the guide vanes has difficulty maintaining stable rotation around the axis, resulting in eccentricity of the rotating shaft.

[0003] The main factors that cause the rotating shaft in a turbine to become eccentric are the impact of water and the external force applied when adjusting the guide vane rotation. Because the guide vane switch requires a very small adjustment angle each time, actual observations revealed two main areas of eccentric wear on the bearing, each very small and approximately 180° apart. This indicates that during the guide vane opening and closing process, the rotating shaft swings relative to the bearing. To address this issue, a sliding bearing with automatic centering has been proposed. This bearing is capable of swinging at a small angle during shaft rotation to prevent hard eccentric wear on the bearing. After the swing, it automatically returns to center to ensure consistent opening and closing of the guide vanes. Summary of the Invention

[0004] The purpose of the present invention is to provide a sliding bearing with automatic centering function and its use method, which can swing at a small angle during the rotation of the rotating shaft to prevent hard and eccentric wear of the bearing shell. After the swing is completed, it can automatically return to the center to ensure the consistency of the opening and closing of the guide vane. To achieve the above-mentioned objectives, the present invention provides a sliding bearing with an automatic centering function, comprising a bearing seat and a sleeve, wherein two circular hole grooves are symmetrically arranged in the upper and lower middle part of the inner wall of the bearing seat, and two cylinders are symmetrically arranged in the upper and lower outer wall of the sleeve, and the cylinders have arc heads. The two cylinders are movably inserted into the two circular hole grooves respectively, and there is a gap between the bearing seat and the sleeve. The sleeve can swing along the central axis of the two cylinders. An electromagnet and a displacement sensor are also installed on the bearing seat. The electromagnets are distributed at the front end and / or rear end of the sleeve and are located on the left and right sides of the sleeve. The displacement sensors are distributed at the front end and / or rear end of the sleeve and are located on the left and / or right sides of the sleeve. The displacement sensor is perpendicular to the central axis of the two cylinders.

[0005] The upper and lower sides of the bearing seat are respectively provided with mounting holes, and embedded blocks are installed in the mounting holes, and the circular hole groove is located on the embedded blocks.

[0006] The mounting hole has a sinking platform, and a protrusion is provided on the side of the embedded block away from the circular hole groove, and the protrusion is installed on the sinking platform. The mounting hole is provided with sliding grooves on the front and rear sides above the sinking platform, and the front and rear sides of the cover plate are respectively provided with sliders adapted to the sliding grooves. The cover plate is inserted into the top of the mounting hole from the left and right directions to limit the embedded block.

[0007] The protruding portion is provided with a plurality of positioning holes, and the sinking platform is provided with pin holes at positions corresponding to the positioning holes. The pins are inserted into the pin holes from one side of the positioning holes, and the pins are located on the lower side of the cover plate.

[0008] Blind holes are respectively provided on the upper and lower sides of the outer wall of the sleeve. An inserting portion is provided at one end where the cylinder is connected to the sleeve. After the inserting portion is inserted into the blind hole, the cylinder and the sleeve are fixedly connected.

[0009] The bearing seat is provided with a through hole, the electromagnet is installed in the through hole, and the head of the electromagnet is close to the inner wall of the bearing seat.

[0010] The through hole is provided with a first limit platform on the side close to the inner wall of the bearing seat, and the through hole is provided with a second limit platform on the side of the tail of the electromagnet. The front end of the electromagnet is clamped on the first limit platform, and the tail end of the electromagnet is provided with a flange, which is installed on the second limit platform. The electromagnet is limited in the through hole by a locking device.

[0011] The locking device includes a limit block, a movable plate, a spring and a set screw, a triangular cavity is provided in the limit block, the two ends of the bottom edge of the triangular cavity pass through the limit block, the limit block is provided with a through hole on the lower side of the triangular cavity, and the limit block is provided with a threaded hole on the upper side of the triangular cavity. Movable plates are respectively installed at the oblique sides on both sides of the triangular cavity, the two movable plates are pivotally hinged, a spring is installed in the through hole, and the set screw is installed in the threaded hole. The inner wall of the through hole is provided with locking grooves at the positions corresponding to the movable plates on both sides. When the set screws are tightened, the movable plates on both sides are moved closer to one side of the bottom edge of the triangular cavity, and the movable plates on both sides are respectively located at the two ends of the bottom edge of the triangular cavity and extend out and inserted into the locking grooves.

[0012] The flange is provided with a limiting hole, the second limiting platform is provided with a corresponding hole corresponding to the limiting hole, the bottom of the limiting block is provided with a limiting column, and the limiting column penetrates the limiting hole and the corresponding hole.

[0013] The outer wall of the shaft sleeve is provided with a magnetic conductive structure at a position corresponding to the electromagnet.

[0014] The magnetic conductive structure includes a plurality of arc-shaped magnetic conductive blocks. Slots are provided at both ends of the sleeve at positions corresponding to the electromagnets. Blocks are provided on both sides of the magnetic conductive blocks. The magnetic conductive blocks are fixed in the slots by embedding the blocks.

[0015] Two electromagnets are respectively installed on the left and right sides of the bearing seat near the front and rear ends. The bearing seat is provided with an embedding hole between the two electromagnets, and the displacement sensor is fixedly installed in the embedding hole; the magnetic conductive block includes a front magnetic conductive block and a rear magnetic conductive block, the front magnetic conductive block includes a left front magnetic conductive block and a right front magnetic conductive block located on the left and right sides of the front end of the shaft sleeve, and the rear magnetic conductive block includes a left rear magnetic conductive block and a right rear magnetic conductive block located on the left and right sides of the rear end of the shaft sleeve.

[0016] A method for centering a sliding bearing with an automatic centering function, using the sliding bearing with the automatic centering function, the centering method comprises the following steps: S1. When in use, electrically connect the electromagnet and displacement sensor to the control module; S2, using a displacement sensor to detect in real time the distance between the sleeves after they swing along the central axis of the two cylinders; S3. When the displacement sensor detects that the actual spacing at one end of the sleeve is greater than the preset spacing, the control module controls the electromagnet on the side where the spacing increases to be energized and controls the output current to attract the sleeve back to the center position; When the displacement sensor detects that the actual spacing at one end of the sleeve is less than the preset spacing, the actual spacing at the other end of the sleeve on the same side of the displacement sensor increases. The control module controls the electromagnet on the side with the increased spacing to be energized and controls the output current to attract the sleeve back to the normal position.

[0017] Compared with the prior art, the present invention has the following technical effects: 1. The present invention enables the sleeve to swing along the central axis of the two cylinders through the cooperation between the cylinder and the circular hole groove. During the rotation of the rotating shaft, it can swing at a small angle to prevent the bearing from hard eccentric wear. The swing position of the sleeve is measured by a displacement sensor. After the swing is completed, the electromagnets at different positions are controlled to start and attract the sleeve back to the center to ensure the consistency of the opening and closing of the guide vanes. 2. In this invention, when the set screw is tightened, the two movable plates move toward the bottom edge of the triangular cavity. The two movable plates extend from either end of the bottom edge of the triangular cavity and insert into the locking slots. This simplifies installation and, because the movable plates are positioned by inserting into the locking slots, the connection is stronger and more stable. When the set screw is loosened, the space between the two movable plates is lifted by a spring, and the movable plates are withdrawn from the locking slots.

[0018] 3. The outer wall of the sleeve of the present invention is provided with a magnetic conductive structure at the position corresponding to the electromagnet. When the sleeve is made of non-magnetic conductive material, such as copper, it can also be attracted by the electromagnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

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

[0021] Figure 2 for Figure 1 Schematic diagram of the AA cross-section structure.

[0022] Figure 3 for Figure 2 Schematic diagram of the CC cross-section structure.

[0023] Figure 4 for Figure 1 Schematic diagram of the BB cross-section structure.

[0024] Figure 5 for Figure 4 Schematic diagram of the DD cross-section structure.

[0025] Figure 6 for Figure 5 The enlarged structural diagram at E in the middle shows the movable plate in the retracted state.

[0026] Figure 7 for Figure 5 The enlarged structural diagram at E in the middle shows the movable plate in the extended state.

[0027] Figure 8 It is a schematic diagram of the automatic centering principle of the present invention.

[0028] Reference numerals: Bearing seat 10, circular hole groove 11, mounting hole 12, embedded block 13, protrusion 131, positioning hole 132, pin hole 14, pin 15, slider 161, slide groove 17, through hole 18, first limit platform 181, second limit platform 182, locking groove 183, embedded hole 19; Sleeve 20, cylinder 21, insert 211, blind hole 22, slot 23, block 33; Magnetic conductive structure 30, front magnetic conductive block 31, rear magnetic conductive block 32, left front magnetic conductive block 311, right front magnetic conductive block 312, left rear magnetic conductive block 321, right rear magnetic conductive block 322; Electromagnet 40, flange 41, limiting hole 411; Locking device 50, limiting block 51, triangular cavity 511, through hole 512, threaded hole 513, limiting column 514, movable plate 52, spring 53, set screw 54; Displacement sensor 60. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0030] Example 1: See also Figure 1-7 A sliding bearing with an automatic centering function includes a bearing seat 10 and a sleeve 20. Two circular hole grooves 11 are symmetrically provided in the middle of the inner wall of the bearing seat 10, and two cylinders 21 are symmetrically provided in the outer wall of the sleeve 20. The two cylinders 21 are movably inserted into the two circular hole grooves 11 respectively. There is a gap between the bearing seat 10 and the sleeve 20, and the sleeve 20 can swing along the central axis of the two cylinders 21. An electromagnet 40 and a displacement sensor 60 are also installed on the bearing seat 10. The electromagnet 40 is distributed at the front end and / or rear end of the sleeve 20 and is located on the left and / or right sides of the sleeve 20. The displacement sensor 60 is distributed at the front end and / or rear end of the sleeve 20 and is located on the left and / or right side of the sleeve 20. The displacement sensor 60 is perpendicular to the central axis of the two cylinders 21.

[0031] Through the cooperation between the cylinder 21 and the circular hole groove 11, the sleeve 20 can swing along the central axis of the two cylinders 21. During the rotation of the rotating shaft, it can swing at a small angle to prevent the bearing from being hard and eccentrically worn. The swing position of the sleeve 20 is measured by the displacement sensor 60. After the swing is completed, the electromagnets 40 at different positions are controlled to start and attract the sleeve 20 back to the center to ensure the consistency of the opening and closing of the guide vanes. In this embodiment, the displacement sensor 60 is an LVDT displacement sensor.

[0032] Specifically, in this embodiment, see Figure 2 The upper and lower sides of the bearing seat 10 are respectively provided with mounting holes 12, and an embedded block 13 is installed in the mounting hole 12, and the circular hole groove 11 is located on the embedded block 13. By adopting the inlay structure, the circular hole groove 11 is convenient for processing.

[0033] Further, see Figure 1 、 2 3. The mounting hole 12 has a sunken platform. The side of the embedded block 13 away from the circular hole 11 is provided with a protrusion 131. The protrusion 131 is mounted on the sunken platform. The mounting hole 12 is provided with a slide groove 17 on the front and rear sides above the sunken platform. The cover plate 16 is provided with sliders 161 on the front and rear sides that adapt to the slide groove 17. The cover plate 16 is inserted from the left and right into the top of the mounting hole 12 to limit the embedded block 13. The above structure facilitates the fixing of the embedded block 13 to the bearing seat 10.

[0034] Further, see Figure 2The protrusion 131 is provided with a plurality of positioning holes 132. The sinking platform is provided with pin holes 14 at positions corresponding to the positioning holes 132. Pins 15 are inserted into the pin holes 14 from one side of the positioning holes 132. Pins 15 are located on the underside of the cover plate 16. This structure improves the stability of the connection between the insert block 13 and the bearing seat 10. Furthermore, the location of the pins 15 on the underside of the cover plate 16 prevents them from falling out.

[0035] When the bearing seat 10 is fixedly installed in the hole of the equipment, the cover plate 16 is also limited, and the cover plate 16 will not slide left and right during use.

[0036] See also Figure 2 To position and secure the cylinder 21 and the sleeve 20, blind holes 22 are provided on the upper and lower sides of the outer wall of the sleeve 20. An insert 211 is provided at the end of the cylinder 21 that connects to the sleeve 20. After the insert 211 is inserted into the blind hole 22, the cylinder 21 and the sleeve 20 are fixedly connected. Specifically, the insert 211 is inserted into the blind hole 22, positioned, and then fixed to the sleeve 20 by welding.

[0037] See also Figure 5 The bearing seat 10 is provided with a through hole 18, and the electromagnet 40 is installed in the through hole 18, and the head of the electromagnet 40 is close to the inner wall of the bearing seat 10. The electromagnet 40 can be embedded and fixed in the through hole 18.

[0038] See also Figure 6 A first limiting platform 181 is provided on the side of the through hole 18 near the inner wall of the bearing seat 10, and a second limiting platform 182 is provided on the side of the through hole 18 located at the tail of the electromagnet 40. The front end of the electromagnet 40 is clamped on the first limiting platform 181, and the tail end of the electromagnet 40 is provided with a flange 41, which is mounted on the second limiting platform 182. The electromagnet 40 is limited in the through hole 18 by the locking device 50. The electromagnet 40 is limited by the first limiting platform 181 and the second limiting platform 182 to improve the stability of the installation of the electromagnet 40. In order to facilitate the installation and removal of the electromagnet 40, the electromagnet 40 is limited in the through hole 18 by the locking device 50. In one of the solutions, a screw can be used to pass through the flange 41 and the second limiting platform 182 to connect. However, when directly connecting with bolts, due to limited space, the diameter of the screw is very small, which is not only inconvenient to install and disassemble, but also has poor connection strength, affecting stability.

[0039] For this purpose, in this embodiment, see Figure 6The locking device 50 includes a limit block 51, a movable plate 52, a spring 53, and a set screw 54. A triangular cavity 511 is provided in the limit block 51. The two ends of the bottom edge of the triangular cavity 511 pass through the limit block 51. The limit block 51 is provided with a through hole 512 on the lower side of the triangular cavity 511. The limit block 51 is provided with a threaded hole 513 on the upper side of the triangular cavity 511. The triangular cavity 511 is provided with movable plates 52 on both sides of the hypotenuse. The two movable plates 52 are pivotally hinged. The spring 53 is installed in the through hole 512. The set screw 54 is installed in the threaded hole 513. The inner wall of the through hole 18 is provided with locking grooves 183 at the positions corresponding to the movable plates 52 on both sides. Figure 7 When the set screws 54 are tightened, the movable plates 52 on both sides move toward the bottom side of the triangular cavity 511. The movable plates 52 on both sides extend out from the two ends of the bottom side of the triangular cavity 511 and are inserted into the locking grooves 183. This structure not only simplifies installation, but also because the movable plates 52 are inserted into the locking grooves 183 for positioning, the connection strength is higher and the stability is better.

[0040] When the set screw 54 is loosened, the position between the two movable plates 52 is lifted by the spring 53 , and the movable plate 52 is withdrawn from the locking groove 183 .

[0041] When the limiting block 51 is manufactured, two parts can be welded together to facilitate the processing of the internal triangular cavity 511 .

[0042] In this embodiment, the pivot joint between the two movable plates 52 is located on one side of the set screw 54 .

[0043] Furthermore, a limiting hole 411 is provided on the flange 41, a corresponding hole corresponding to the limiting hole 411 is provided on the second limiting platform 182, a limiting column 514 is provided at the bottom of the limiting block 51, and the limiting column 514 penetrates into the limiting hole 411 and the corresponding hole. Through the above structure, the rotation of the electromagnet 40 is limited.

[0044] It should be noted that the bearing seat 10 is axially provided with a through hole at the position of the electromagnet 40, and the through hole is used for the cable to pass through to supply power to the electromagnet.

[0045] Example 2: Based on Example 1, a magnetic conductive structure 30 is installed on the outer wall of the sleeve 20 at a position corresponding to the electromagnet 40. When the sleeve 20 is made of non-magnetic conductive material, for example, copper, it can also be attracted by the electromagnet 40.

[0046] In this embodiment, see Figure 4 、 5The magnetic conductive structure 30 includes a plurality of arc-shaped magnetic conductive blocks. Slots 23 are provided at both ends of the sleeve 20 at positions corresponding to the electromagnets 40. Blocks 33 are provided on both sides of the magnetic conductive blocks. The magnetic conductive blocks are fixed in the slots 23 through the blocks 33. The above structure facilitates the installation of the magnetic conductive blocks.

[0047] In this embodiment, two electromagnets 40 are respectively installed on the left and right sides of the bearing seat 10 near the front and rear ends. The bearing seat 10 is provided with an embedding hole 19 between the two electromagnets 40, and the displacement sensor 60 is fixedly installed in the embedding hole 19; the magnetic block includes a front magnetic block 31 and a rear magnetic block 32, the front magnetic block 31 includes a left front magnetic block 311 and a right front magnetic block 312 located on the left and right sides of the front end of the sleeve 20, and the rear magnetic block 32 includes a left rear magnetic block 321 and a right rear magnetic block 322 located on the left and right sides of the rear end of the sleeve 20.

[0048] Example 3: On the basis of Example 1 or Example 2, see Figure 8 A method for centering a sliding bearing with an automatic centering function is provided, wherein a sliding bearing with an automatic centering function is used, and the centering method comprises the following steps: S1. When in use, the electromagnet 40 and the displacement sensor 60 are electrically connected to the control module; S2, using the displacement sensor 60 to detect in real time the distance between the sleeve 20 after it swings along the central axis of the two cylinders 21; S3. When the displacement sensor 60 detects that the actual spacing at one end of the sleeve 20 is greater than the preset spacing, the control module controls the electromagnet 40 on the side where the spacing increases to be energized and controls the output current to attract the sleeve 20 back to the normal position. When the displacement sensor 60 detects that the actual spacing at one end of the sleeve 20 is less than the preset spacing, the actual spacing at the other end of the sleeve 20 on the same side of the displacement sensor 60 increases. The control module controls the electromagnet 40 on the side with the increased spacing to be energized and controls the output current to attract the sleeve 20 back to the normal position.

[0049] Specifically, see Figure 8 When the shaft is eccentric, the displacement sensor 60 mounted on the bearing seat 10 measures the offset of the sleeve 20. The offset signal is transmitted to the control module, which dynamically adjusts the current using a PID control algorithm and transmits the current to the electromagnet 40. The electromagnet 40 attracts the sleeve 20 to achieve automatic centering. In this embodiment, eight electromagnets are mounted on the bearing seat.

[0050] See also Figure 5The displacement sensor 60 on the left side of the bearing seat 10 is the first sensor, and two electromagnets 40 are installed at both ends of the left side of the bearing seat 10; the displacement sensor 60 on the right side of the bearing is the second sensor, and two electromagnets 40 are installed at both ends of the right side of the bearing. The distance measured by sensors 1 and 2 is .

[0051] The control module is a PID controller, and its principle formula is: ; Where: u(t) is the controller output, e(t) is the error, K p is the proportional gain, K i is the integral gain, K d is the differential gain, is the error change rate, is the integral of the error.

[0052] In the automatic centering process of sliding bearings, the set value is the expected position (centering position), the feedback signal is the actual position, and the error can be expressed as displacement offset. To express.

[0053] According to the PID control formula, the output current is I: ; The operating logic of the bearing automatic alignment function based on the PID control algorithm is as follows: After the control module receives the signal from the displacement sensor, it uses the PID control algorithm to calculate the control signal I To control the current of the electromagnet. Gradually reduce, the current value is continuously adjusted, gradually offset the sleeve, and finally realize the automatic alignment of the bearing and the rotating shaft. When it approaches zero, the control signal I It automatically adjusts to zero, the electromagnet is powered off, and the automatic centering process is completed.

[0054] Current direction control: When Δx>0, it means that the rotating axis is tilted to the right, and the current is directed to the electromagnet 40 at the front end on the right and the rear end on the left; when Δx<0, it means that the rotating axis is tilted to the left, and the current is directed to the electromagnet 40 at the front end on the left and the rear end on the right.

Claims

1. A sliding bearing with an automatic centering function, comprising a bearing seat (10) and a shaft sleeve (20), characterized in that: Two circular hole grooves (11) are symmetrically arranged in the middle of the inner wall of the bearing seat (10), and two cylinders (21) are symmetrically arranged in the outer wall of the shaft sleeve (20). The two cylinders (21) are movably inserted into the two circular hole grooves (11). There is a gap between the bearing seat (10) and the shaft sleeve (20), and the shaft sleeve (20) can swing along the central axis of the two cylinders (21). The bearing seat (10) is also equipped with an electromagnet (40) and a displacement sensor (60). The electromagnet (40) is distributed at the front end and / or rear end of the shaft sleeve (20) and is located on the left and / or right sides of the shaft sleeve (20). The displacement sensor (60) is distributed at the front end and / or rear end of the shaft sleeve (20) and is located on the left and / or right sides of the shaft sleeve (20). The displacement sensor (60) is perpendicular to the central axis of the two cylinders (21).

2. The sliding bearing with automatic centering function according to claim 1, characterized in that: Mounting holes (12) are respectively provided on the upper and lower sides of the bearing seat (10), an embedding block (13) is installed in the mounting hole (12), and the circular hole groove (11) is located on the embedding block (13).

3. The sliding bearing with automatic centering function according to claim 2, characterized in that: The mounting hole (12) has a sinking platform, and a protrusion (131) is provided on a side of the embedded block (13) away from the circular hole groove (11), and the protrusion (131) is installed on the sinking platform. The mounting hole (12) is provided with a slide groove (17) on the front and rear sides above the sinking platform, and a slider (161) adapted to the slide groove (17) is provided on the front and rear sides of the cover plate (16), respectively. The cover plate (16) is inserted into the top of the mounting hole (12) from the left and right directions to limit the embedded block (13).

4. The sliding bearing with automatic centering function according to claim 3, characterized in that: The protruding portion (131) is provided with a plurality of positioning holes (132), and a pin hole (14) is provided on the sinking platform at a position corresponding to the positioning hole (132). The pin (15) penetrates the pin hole (14) from one side of the positioning hole (132), and the pin (15) is located on the lower side of the cover plate (16).

5. The sliding bearing with automatic centering function according to claim 1, characterized in that: Blind holes (22) are respectively provided on the upper and lower sides of the outer wall of the shaft sleeve (20); an insertion portion (211) is provided at one end of the cylinder (21) connected to the shaft sleeve (20); after the insertion portion (211) is inserted into the blind hole (22), the cylinder (21) and the shaft sleeve (20) are fixedly connected.

6. The sliding bearing with automatic centering function according to claim 1, characterized in that: The bearing seat (10) is provided with a through hole (18), and the electromagnet (40) is installed in the through hole (18), with the head of the electromagnet (40) close to the inner wall of the bearing seat (10).

7. The sliding bearing with automatic centering function according to claim 6, characterized in that: A first limiting platform (181) is provided on one side of the through hole (18) close to the inner wall of the bearing seat (10), and a second limiting platform (182) is provided on the side of the through hole (18) located at the tail of the electromagnet (40). The front end of the electromagnet (40) is clamped on the first limiting platform (181), and the tail end of the electromagnet (40) is provided with a flange (41), which is installed on the second limiting platform (182). The electromagnet (40) is limited in the through hole (18) by the locking device (50).

8. The sliding bearing with automatic centering function according to claim 7, characterized in that: The locking device (50) includes a limit block (51), a movable plate (52), a spring (53) and a set screw (54), wherein a triangular cavity (511) is provided in the limit block (51), and both ends of the bottom side of the triangular cavity (511) pass through the limit block (51), and the limit block (51) is provided with a through hole (512) on the lower side of the triangular cavity (511), and the limit block (51) is provided with a threaded hole (513) on the upper side of the triangular cavity (511), and movable springs (53) are respectively installed on the oblique sides of both sides of the triangular cavity (511). The movable plate (52) is pivotally hinged between the two movable plates (52), a spring (53) is installed in the through hole (512), and a set screw (54) is installed in the threaded hole (513). The inner wall of the through hole (18) is provided with a locking groove (183) at the position corresponding to the movable plates (52) on both sides. When the set screw (54) is tightened, the movable plates (52) on both sides are moved closer to the bottom side of the triangular cavity (511), and the movable plates (52) on both sides are respectively located at the two ends of the bottom side of the triangular cavity (511) and extend out and are inserted into the locking groove (183).

9. The sliding bearing with automatic centering function according to claim 8, characterized in that: A limiting hole (411) is provided on the flange (41), a corresponding hole corresponding to the limiting hole (411) is provided on the second limiting platform (182), a limiting column (514) is provided at the bottom of the limiting block (51), and the limiting column (514) penetrates the limiting hole (411) and the corresponding hole.

10. The sliding bearing with automatic centering function according to claim 1, characterized in that: A magnetic conductive structure (30) is installed on the outer wall of the shaft sleeve (20) at a position corresponding to the electromagnet (40).

11. The sliding bearing with automatic centering function according to claim 10, characterized in that: The magnetic conductive structure (30) comprises a plurality of arc-shaped magnetic conductive blocks, and slots (23) are provided at both ends of the shaft sleeve (20) at positions corresponding to the electromagnets (40), and blocks (33) are provided on both sides of the magnetic conductive blocks. The magnetic conductive blocks are embedded and fixed in the slots (23) through the blocks (33).

12. The sliding bearing with automatic centering function according to claim 11, characterized in that: Two electromagnets (40) are respectively installed on the left and right sides of the bearing seat (10) near the front and rear ends. The bearing seat (10) is provided with an embedding hole (19) between the two electromagnets (40), and the displacement sensor (60) is fixedly installed in the embedding hole (19); the magnetic conductive block includes a front magnetic conductive block (31) and a rear magnetic conductive block (32), the front magnetic conductive block (31) includes a left front magnetic conductive block (311) and a right front magnetic conductive block (312) located on the left and right sides of the front end of the shaft sleeve (20), and the rear magnetic conductive block (32) includes a left rear magnetic conductive block (321) and a right rear magnetic conductive block (322) located on the left and right sides of the rear end of the shaft sleeve (20).

13. A method for centering a sliding bearing with an automatic centering function, characterized in that: A sliding bearing with an automatic centering function according to any one of claims 1 to 12 is used, and a centering method comprises the following steps: S1. When in use, the electromagnet (40) and the displacement sensor (60) are electrically connected to the control module; S2, detecting in real time the distance between the sleeve (20) and the center axis of the two cylinders (21) after the sleeve (20) swings along the center axis of the two cylinders (21) through the displacement sensor (60); S3, when the displacement sensor (60) detects that the actual spacing at one end of the sleeve (20) is greater than the preset spacing, the control module controls the electromagnet (40) on the side where the spacing increases to be energized and controls the output current to attract the sleeve (20) back to the normal position; When the displacement sensor (60) detects that the actual spacing at one end of the shaft sleeve (20) is less than the preset spacing, the actual spacing at the other end of the shaft sleeve (20) on the same side of the displacement sensor (60) increases, and the control module controls the electromagnet (40) on the side where the spacing increases to be energized and controls the output current to attract the shaft sleeve (20) back to the normal position.

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