Lattice type intelligent sliding bearing and intelligent lubrication method thereof

Abstract

The invention belongs to the technical field of lubrication in mechanical engineering, and specifically relates to a lattice type intelligent sliding bearing and an intelligent lubrication method thereof. The lattice type intelligent sliding bearing comprises a magnetic liquid sliding bearing body and a closed-loop feedback control system. The magnetic liquid sliding bearing body comprises a bushing, and a plurality of mounting holes are evenly distributed on the bushing for placing electromagnets. The closed-loop feedback control system comprises an eddy current displacement sensor component and a controller. The eddy current displacement sensor component is used to output an original displacement signal for detecting radial runout of a rotating shaft, and the controller controls the current of the electromagnet according to the original displacement signal. The invention uses a closed-loop feedback control system to control the current of each electromagnet in real time, thereby realizing on-demand adjustment of the distribution position of the magnetic liquid. After several iterations, the lubrication effect of the lattice type intelligent sliding bearing under extreme working conditions such as high speed and high load is always maintained, thereby achieving the effect of intelligent lubrication.

Description

Technical Field

[0001] The invention belongs to the technical field of lubrication in mechanical engineering, and in particular relates to a lattice-type intelligent sliding bearing and an intelligent lubrication method thereof. Background Art

[0002] As a new type of active controllable bearing, magnetic liquid sliding bearing has broad application prospects in high-end scientific and technological fields such as aerospace, cutting-edge weapons and communication satellites. Magnetic liquid sliding bearing can make the magnetic liquid in the bearing flow to the designated area under the action of an external magnetic field, thereby achieving the effect of localized lubrication. At the same time, the adjustable characteristics of the viscosity of the magnetic liquid under the action of the magnetic field are an important basis for the intelligent lubrication of the bearing.

[0003] In the context of the rapid development of modern industry towards intelligence, higher requirements are placed on bearing lubrication: under special working conditions such as high speed and high load, the existing bearing lubrication methods face problems such as lubricating medium ejection, excessively thick lubricating oil film and uncontrollable lubrication effect, which are far from meeting the requirements of high-precision and intelligent control of lubrication for high-precision equipment.

[0004] Therefore, how to design a magnetic liquid sliding bearing suitable for special working conditions such as high speed and high load and realize intelligent lubrication has become an urgent problem to be solved by technicians in this field. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a lattice type intelligent sliding bearing and an intelligent lubrication method for a lattice type intelligent sliding bearing, aiming to overcome the problems that the lubrication effect of the sliding bearing is poor and the thickness of the lubricating oil film cannot be adjusted as needed when the sliding bearing is used under special working conditions such as high speed and high load.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] The lattice intelligent sliding bearing comprises: a magnetic liquid sliding bearing body and a closed-loop feedback control system, wherein:

[0008] The magnetic liquid sliding bearing body comprises a bushing sleeved on the outer surface of the rotating shaft, a lubricating oil film formed by magnetic liquid is arranged between the bushing and the rotating shaft, and the lubricating effect of the lubricating oil film is used to realize the lubricated rotation of the rotating shaft in the magnetic liquid sliding bearing body; on this basis, n rows of electromagnetic arrays are evenly arranged along the circumference of the bushing, 4≤n≤20, each row of the electromagnetic array is evenly spaced with m mounting holes, 3≤m≤10, each mounting hole is provided with an electromagnet, each electromagnet is connected to a control wire, and the control wires are connected to a closed-loop feedback control system;

[0009] Closed-loop feedback control system, including:

[0010] An eddy current displacement sensor assembly, comprising a first eddy current displacement sensor and a second eddy current displacement sensor which are both arranged on one side of a magnetic liquid sliding bearing body, wherein the first eddy current displacement sensor and the second eddy current displacement sensor are located in the same vertical plane, and the plane coincides with the radial cross section of the rotating shaft, on this basis, the angle between the two eddy current displacement sensors is 90°, the first eddy current displacement sensor is used to measure the vertical displacement of the rotating shaft, and convert the measured data into an original displacement signal through a converter; the second eddy current displacement sensor is used to measure the horizontal displacement of the rotating shaft, and convert the measured data into an original displacement signal through a converter;

[0011] The controller is connected to each electromagnet and the eddy current displacement sensor assembly. The controller receives and processes the original displacement signal emitted by the eddy current displacement sensor assembly, and then emits a control signal for controlling the magnitude of the coil current in each electromagnet, so as to adjust the thickness of the lubricating oil film to be uniform.

[0012] Preferably, in the magnetic liquid sliding bearing body, the bushing is stepped, including an integrally arranged step portion and a mounting portion, and the mounting hole is arranged on the outer wall of the mounting portion. In addition, on the mounting portion, a wire channel is arranged on one side of each electromagnetic array, and the wire channel is connected to each mounting hole in the electromagnetic array through a wire groove, and one end of a plurality of wire channels is connected through a circular groove, and the circular groove is arranged inside the step portion;

[0013] On this basis, a coil outlet is also provided on the step portion, and the coil outlet is connected to the circular groove; in each column of the electromagnetic array, the control wire in the mounting hole is collected inside the wire channel through the wire groove; on the bushing, the control wires inside several wire channels are collected inside the circular groove, and after extending out of the magnetic liquid sliding bearing body from the coil outlet, they are connected to the closed-loop feedback control system.

[0014] More preferably, the lattice-type intelligent sliding bearing further comprises: a sleeve for covering the outer wall of the mounting portion of the bushing, one end of the sleeve abutting against the step portion, and the wall thickness of the sleeve is the same as the thickness of the step portion, the other end of the sleeve is arranged on one side of the end of the mounting portion through a folding portion, and on the folding portion, a first sealing ring is also provided on the side close to the rotating shaft through a first mounting groove, for preventing the magnetic liquid from leaking from between the folding portion of the sleeve and the rotating shaft.

[0015] Furthermore, the lattice-type intelligent sliding bearing also includes a bearing seat, the inner wall of the bearing seat is fitted with the outer wall of the sleeve and the outer wall of the step portion, and in addition, the magnetic liquid sliding bearing body is provided with an end cover at one end close to the step portion, and the end cover is provided with a through hole, which is connected to the coil outlet for the control wire to pass through, on this basis, the end cover is connected to the bearing seat by a fixing screw, and the end cover is also provided with a second sealing ring through a second mounting groove on the side close to the rotating shaft, which is used to prevent the magnetic liquid from leaking from between the end cover and the rotating shaft;

[0016] The sleeve, bushing and bearing seat are connected by a connecting key.

[0017] Furthermore, in the bushing, a threaded hole is provided at the bottom of each mounting hole on the mounting portion for cooperating with a bolt to tighten the electromagnet to the inside of the mounting hole;

[0018] The control wire is bonded to the wire groove, the wire channel, and the inside of the circular groove by hot-melt adhesive.

[0019] In addition, the present invention also provides an intelligent lubrication method for a lattice-type intelligent sliding bearing, which is applied to the above-mentioned lattice-type intelligent sliding bearing, and the intelligent lubrication method comprises:

[0020] S1. Using a motor to provide rotational power to the shaft, the shaft starts to rotate, and the lattice-type intelligent sliding bearing uses a lubricating oil film body for non-electrical lubrication;

[0021] S2. Under the action of load, the shaft gradually deviates from the center of the bushing during rotation, and the eccentricity causes the shaft to produce horizontal and vertical displacements; two eddy current displacement sensors are used to collect the original displacement signals of the shaft in the horizontal and vertical directions respectively;

[0022] S3, after processing the original displacement signal by the controller, output a current signal for regulating the current in the coil of the electromagnet;

[0023] S4. Repeat the above steps until the minimum oil film thickness of the lubricating oil film is maximized. At this time, the lubrication effect of the lattice intelligent sliding bearing is optimal.

[0024] Preferably, in step S2, under the action of the load, the rotating shaft gradually produces eccentricity from the center of the bushing during the rotation process, and the eccentricity causes the rotating shaft to produce horizontal and vertical displacements. On this basis, taking the center o of the bushing as the origin, its coordinates are o(0, 0), the horizontal direction is the X-axis, and the vertical direction is the Y-axis. After the rotating shaft is eccentric, the detection point coordinates A(0, a) on the surface of the rotating shaft in the vertical direction and the detection point coordinates B(b, 0) on the surface of the rotating shaft in the horizontal direction are measured by two eddy current displacement sensors, and the coordinate data of the two points are converted into original displacement signals through a converter and sent to the controller.

[0025] More preferably, in step S3, after the original displacement signal is processed by the controller, a current signal for regulating the current in the coil of the electromagnet is output, which specifically includes:

[0026] S31, according to the coordinate data of points A (0, a) and B (b, 0), the eccentric trajectory equation group of the rotating shaft is obtained, and the coordinate of the center o' of the rotating shaft after the eccentricity is obtained;

[0027] S32, obtaining the value of the deflection angle according to the coordinates of the center o' of the rotating shaft after the deflection, and determining the geometric position and specific thickness value h of the minimum oil film thickness according to the value of the deflection angle;

[0028] S33, select multiple electromagnets located within the distance s according to the position, and use the controller to adjust the current magnitude of the multiple electromagnets to I i +ΔI i .

[0029] Further, in step S31: assuming that the radius of the bushing is R, the radius of the rotating shaft is r, the center of the rotating shaft after eccentricity is o′, and the coordinates of o′ are o′(x1, y1);

[0030] ① When the shaft is subjected to a vertical downward load, according to the coordinates of points A (0, a) and B (b, 0), the equation of the straight line ab is:

[0031]

[0032] Wherein: a is the ordinate value of the detection point coordinate A (0, a) on the rotating shaft surface in the vertical direction after the rotating shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the rotating shaft surface in the horizontal direction after the rotating shaft is eccentric;

[0033] Point o' is located on the perpendicular bisector of line ab, and the equation of the perpendicular bisector is:

[0034]

[0035] Wherein: a is the ordinate value of the detection point coordinate A (0, a) on the rotating shaft surface in the vertical direction after the rotating shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the rotating shaft surface in the horizontal direction after the rotating shaft is eccentric;

[0036] Since the length of o′b is the radius r of the rotating shaft, according to the perpendicular bisector equation and the Pythagorean theorem, the eccentric trajectory equation group of the rotating shaft is obtained to calculate the o′ coordinate; the eccentric trajectory equation group is:

[0037]

[0038] Where: a is the ordinate value of the detection point coordinate A (0, a) on the surface of the rotating shaft in the vertical direction after the rotating shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the surface of the rotating shaft in the horizontal direction after the rotating shaft is eccentric; x1 and y1 are the abscissa value and ordinate value of the center o′ of the rotating shaft after the rotating shaft is eccentric, respectively;

[0039] ② When the shaft is subjected to a vertical upward load, according to the coordinates of points A (0, a) and B (b, 0), the equation of the straight line ab is:

[0040]

[0041] Wherein: a is the ordinate value of the detection point coordinate A (0, a) on the rotating shaft surface in the vertical direction after the rotating shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the rotating shaft surface in the horizontal direction after the rotating shaft is eccentric;

[0042] Point o' is located on the perpendicular bisector of line ab, and the equation of the perpendicular bisector is:

[0043]

[0044] Wherein: a is the ordinate value of the detection point coordinate A (0, a) on the rotating shaft surface in the vertical direction after the rotating shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the rotating shaft surface in the horizontal direction after the rotating shaft is eccentric;

[0045] Since the length of o′b is the radius r of the rotating shaft, according to the perpendicular bisector equation and the Pythagorean theorem, the eccentric trajectory equation group of the rotating shaft is obtained to calculate the o′ coordinate; the eccentric trajectory equation group is:

[0046]

[0047] In the formula: a is the ordinate value of the detection point coordinate A (0, a) on the shaft surface in the vertical direction after the shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the shaft surface in the horizontal direction after the shaft is eccentric; x1 and y1 are the abscissa value and ordinate value of the center o′ of the shaft after the shaft is eccentric, respectively.

[0048] Furthermore, in step S32: the value θ of the deflection angle is obtained according to the following formula:

[0049]

[0050] Where: x1 and y1 are the horizontal and vertical coordinate values ​​of the center o′ of the rotating shaft after eccentricity;

[0051] On this basis, the minimum thickness h of the lubricating oil film is obtained according to the following formula:

[0052] h=c(1+εcosθ)

[0053] In the formula: c is the radial clearance of the bearing; ε is the eccentricity; θ is the offset angle.

[0054] The beneficial effects of the present invention are:

[0055] The present invention evenly arranges a number of electromagnets on the bushing of the magnetic liquid sliding bearing body, and uses a closed-loop feedback control system to control the current of each electromagnet in real time, thereby achieving controllable magnetic field intensity in each area of ​​the bushing, and finally achieving on-demand adjustment of the distribution position of the magnetic liquid. After several iterations, the minimum lubricating oil film thickness is maximized, so that the lubrication effect of the lattice intelligent sliding bearing under extreme working conditions such as high speed and high load is always maintained, achieving the effect of intelligent lubrication. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0057] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the lattice-type intelligent sliding bearing in the present invention;

[0058] Figure 2 It is a schematic side structural cross-sectional view of the lattice-type intelligent sliding bearing in the present invention;

[0059] Figure 3 for Figure 2 Schematic diagram of the cross section in the AA direction;

[0060] Figure 4 It is a three-dimensional structural schematic diagram of the bushing in the present invention;

[0061] Figure 5It is a measurement schematic diagram of the rotating shaft in the present invention being subjected to a vertical downward load and being eccentric to the negative half axis of the X-axis;

[0062] Figure 6 It is a measurement schematic diagram of the rotating shaft in the present invention being subjected to a vertical downward load and being eccentric to the positive half axis of the X-axis;

[0063] Figure 7 This is a flow chart of the intelligent lubrication method in an embodiment of the present invention;

[0064] Figure 8 This is a flow chart of the processing of the original displacement signal by the controller in an embodiment of the present invention. DETAILED DESCRIPTION

[0065] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] Known magnetic liquid sliding bearings generally use permanent magnets to control the lubricating oil film formed by the magnetic liquid. The control principle is: using the magnetic field generated by the permanent magnet to adsorb nano-scale magnetic particles in the magnetic liquid near the permanent magnet, so as to obtain a lubricating oil film around the entire rotating shaft in the magnetic liquid sliding bearing, thereby achieving a lubricating effect.

[0068] Among them, the lubricating effect of the lubricating oil film is related to the load on the rotating shaft. The forces borne by the commonly used magnetic liquid sliding bearings include: the gravity of the rotating shaft and the downward load. The superposition of the above-mentioned forces will cause the rotating shaft to produce downward eccentricity during operation, thereby making the lubricating oil film at this position thinner. Even when the load is too large, the rotating shaft tends to contact and rub against the bushing. At this time, this position is called the minimum oil film thickness position, and the lubricating effect of the lubricating oil film is significantly reduced.

[0069] In addition, the lubricating effect of the lubricating oil film is also related to the rotation speed of the shaft. Taking the control variable as an example, if the load on the shaft is constant, the faster the rotation speed of the shaft, the easier it is for the magnetic liquid to be thrown out from both ends of the bearing due to the centrifugal force, causing the thickness of the lubricating oil film to decrease. In this case, the lubricating effect of the lubricating oil film is also significantly reduced. As a result, the applicability of the magnetic liquid sliding bearing is greatly reduced. In order to be suitable for different speeds and different loads, multiple types of bearings are required, resulting in a significant increase in production costs.

[0070] In view of this, the present invention provides a lattice type intelligent sliding bearing, in which the permanent magnet is replaced by an electromagnet that can generate a magnetic field when powered on, and the electromagnet is evenly distributed on the bushing, so that the magnetic liquid is evenly distributed between the bushing and the rotating shaft after power is turned on. On the basis of this structure, the present invention uses a closed-loop feedback control system to detect the radial runout of the rotating shaft in real time, and after the controller analyzes the radial runout of the rotating shaft, controls the current of each electromagnet, and then controls the magnetic field strength generated by each electromagnet, so as to achieve real-time control of the distribution of the magnetic liquid in each area where the lubricating oil film is located, and finally maximizes the minimum oil film thickness of the lubricating oil film, so that the lubrication effect of the lattice type intelligent sliding bearing is always maintained, and the effect of intelligent lubrication is achieved.

[0071] Although the reasons for the eccentricity of the rotating shaft include too high a rotation speed and too large a load, the thinning effect of the lubricating oil film caused by the above two reasons is the same. Therefore, this application takes the load aspect as an example to design the magnetic liquid sliding bearing, and the sliding bearings appearing in this application are all magnetic liquid sliding bearings.

[0072] The technical solution of the present application will be described in detail below with reference to the accompanying drawings.

[0073] In this technical solution, the lattice intelligent sliding bearing is applied to the rotating shaft 1. In actual use, it can be summarized as follows: one end of the rotating shaft 1 is provided with a rotational power by a motor, and the other end is provided with a load to provide a load for the rotating shaft 1. The motor and the load are not shown in the figure.

[0074] The lattice type intelligent sliding bearing comprises: a magnetic liquid sliding bearing body 2 and a closed-loop feedback control system.

[0075] Among them, Figure 1-4 As shown, the magnetic liquid sliding bearing body 2 includes a bushing 201 sleeved on the outer surface of the rotating shaft 1. The bushing 201 is stepped and includes an integral step portion 202 and a mounting portion 203. A lubricating oil film 3 formed by magnetic liquid is provided between the bushing 201 and the rotating shaft 1. The lubricating effect of the lubricating oil film 3 enables the lubricated rotation of the rotating shaft 1 in the magnetic liquid sliding bearing body 2.

[0076] As the core of this application, in the bushing 201, as Figure 2-4 As shown, n rows of electromagnetic arrays are evenly distributed along the circumference of the outer wall of the mounting portion 203, 4≤n≤20, and m mounting holes 4 are evenly spaced in each row of the electromagnetic array, 3≤m≤10, where n and m represent the density of the mounting holes 4. If they are too dense, the processing and assembly difficulty of the structure itself will increase. If they are too loose, the intelligent lubrication and control effect of the dot matrix intelligent sliding bearing will deteriorate. An electromagnet is provided in each mounting hole 4, and each electromagnet is connected to a control wire, which is connected to a closed-loop feedback control system after being collected.

[0077] Among them, the installation of the electromagnet adopts the following structural method:

[0078] A threaded hole 401 is provided at the bottom of each mounting hole 4 for cooperating with a bolt to tighten the electromagnet inside the mounting hole 4 .

[0079] In addition, the following structure is used for the collection and processing of the control wires:

[0080] like Figure 3 , Figure 4 As shown, on the mounting portion 203, a wire channel 5 is provided on one side of each electromagnetic array, and the wire channel 5 is connected to each mounting hole 4 in the electromagnetic array through a wire groove 6. One end of several wire channels 5 is connected through a circular groove 7, and the circular groove 7 is arranged inside the step portion 202; furthermore, a coil outlet 204 is also opened on the step portion 202, and the coil outlet 204 is connected to the circular groove 7.

[0081] Based on the above structure, after the control wires in the mounting hole 4 pass through the wire groove 6 and are gathered inside the wire channel 5, several control wires inside the wire channel 5 are gathered again inside the circular groove 7. The finally gathered control wires extend out of the magnetic liquid sliding bearing body 2 from the coil outlet 204 and are connected to the closed-loop feedback control system, wherein the control wires are bonded to the wire groove 6, the wire channel 5, and the inside of the circular groove 7 by hot-melt glue.

[0082] In this technical solution, in order to cooperate with the installation and use of the magnetic liquid sliding bearing body 2, as Figure 3As shown, the lattice type intelligent sliding bearing also includes: a sleeve 8, a bearing seat 9 and an end cover 10.

[0083] Among them, the sleeve 8 is arranged on the outer wall of the mounting portion 203 of the bushing 201, one end of the sleeve 8 is in contact with the step portion 202, and the wall thickness of the sleeve 8 is the same as the thickness of the step portion 202, and the other end of the sleeve 8 is arranged on one side of the end of the mounting portion 203 through a folding portion 801, and on the folding portion 801, a first sealing ring 802 is also provided on the side close to the rotating shaft 1 through a first mounting groove, which is used to prevent the magnetic liquid from leaking from between the folding portion 801 of the sleeve 8 and the rotating shaft 1.

[0084] The inner wall of the bearing seat 9 fits with the outer wall of the sleeve 8 and the outer wall of the step portion 202 . More specifically, the sleeve 8 , the bushing 201 and the bearing seat 9 are connected by a connecting key 205 .

[0085] In addition, the magnetic liquid sliding bearing body 2 is provided with an end cover 10 at one end close to the step portion 202, and a through hole 1001 is provided on the end cover 10. The through hole 1001 is connected to the coil outlet 204 and is used to control the passage of the wire. On this basis, the end cover 10 is connected to the bearing seat 9 through a fixing screw. The end cover 10 is also provided with a second sealing ring 1002 through a second mounting groove on the side close to the rotating shaft 1, which is used to prevent the magnetic liquid from leaking from between the end cover 10 and the rotating shaft 1.

[0086] In this technical solution, if Figure 1 , Figure 3 As shown, the closed-loop feedback control system includes: an eddy current displacement sensor component and a controller.

[0087] The eddy current displacement sensor assembly includes a first eddy current displacement sensor 11 and a second eddy current displacement sensor 12 which are simultaneously arranged on one side of a magnetic liquid sliding bearing body 2. Specifically, the first eddy current displacement sensor 11 is arranged on an end cover 10 through a first connecting member, and the second eddy current displacement sensor 12 is also arranged on the end cover 10 through a second connecting member. In addition, the first eddy current displacement sensor 11 and the second eddy current displacement sensor 12 are located in the same vertical plane, and the plane coincides with the radial section of the rotating shaft 1. On this basis, the angle between the two eddy current displacement sensors is 90°. The first eddy current displacement sensor 1 is used to measure the vertical displacement of the rotating shaft 1, and the measurement data is converted into an original displacement signal through a converter and then sent to a controller; the second eddy current displacement sensor 12 is used to measure the horizontal displacement of the rotating shaft 1, and the measurement data is converted into an original displacement signal through a converter and then sent to the controller.

[0088] The controller is connected to each electromagnet and the eddy current displacement sensor assembly. The controller is used to receive and process the original displacement signal emitted by the eddy current displacement sensor assembly, and then emit a control signal for controlling the size of the coil current in each electromagnet. The controller is not shown in the figure.

[0089] At this point, the above structure can realize real-time control of the distribution of magnetic liquid in each area where the lubricating oil film 3 is located, thereby ultimately maximizing the minimum oil film thickness of the lubricating oil film 3 and making the thickness of the lubricating oil film 3 tend to be uniform, so that the lubrication effect of the lattice intelligent sliding bearing is always maintained, achieving the effect of intelligent lubrication.

[0090] Based on the above structure, the present application also provides an intelligent lubrication method for a dot matrix intelligent sliding bearing, such as Figure 7 As shown, including:

[0091] In step S1: a motor is used to provide rotational power to the shaft 1, and the shaft 1 starts to rotate. Since the magnetic liquid itself is a lubricating oil, at the beginning of the rotation of the shaft 1, the lattice intelligent sliding bearing uses the lubricating oil film 3 body to perform non-electrical lubrication.

[0092] In step S2: under the action of load, the shaft 1 gradually deviates from the center of the bushing 201 during rotation, and the eccentricity causes the shaft 1 to produce horizontal and vertical displacements; two eddy current displacement sensors are used to collect the original displacement signals of the shaft 1 in the horizontal and vertical directions respectively.

[0093] Specifically, the center o of the bushing 201 is taken as the origin, and its coordinates are o(0, 0), the horizontal direction is the X-axis, and the vertical direction is the Y-axis.

[0094] In the present application, two eddy current displacement sensors are used to measure the detection point coordinates A (0, a) on the surface of the rotating shaft 1 in the vertical direction and the detection point coordinates B (b, 0) on the surface of the rotating shaft 1 in the horizontal direction after the rotating shaft 1 is eccentric, and the coordinate data of the two points are converted into original displacement signals through a converter and sent to the controller.

[0095] In step S3: after the original displacement signal is processed by the controller, a current signal for regulating the current in the coil of the electromagnet is output, such as Figure 8 As shown, specifically including:

[0096] S31. The eccentric trajectory equations of the rotating shaft 1 are obtained according to the coordinate data of the two points A (0, a) and B (b, 0), and the coordinates of the center o' of the rotating shaft 1 after the eccentricity are obtained according to the equations. In this step: the radius of the bushing 201 is R, the radius of the rotating shaft 1 is r, the center of the rotating shaft 1 after the eccentricity is o', and the coordinates of o' are o'(x1, y1).

[0097] In actual applications, the load direction of the rotating shaft 1 of the rotating body may be directed to the center of the circle from any point along its circumference, and it is impossible to study any situation of the load on the rotating shaft 1. Therefore, after many experiments, the representative load directions of the rotating shaft 1 are obtained by induction method for research. The representative load directions are: the rotating shaft 1 is subjected to a vertical upward load; the rotating shaft 1 is subjected to a vertical downward load.

[0098] These two situations will be explained in detail below.

[0099] ① When the shaft 1 is subjected to a vertical downward load, according to the coordinates of points A (0, a) and B (b, 0), the equation of the straight line ab is:

[0100]

[0101] In the formula: a is the ordinate value of the detection point coordinate A (0, a) on the rotating shaft surface in the vertical direction after the shaft is eccentric; b is the lateral coordinate value of the detection point coordinate B (b, 0) on the rotating shaft surface in the horizontal direction after the shaft is eccentric.

[0102] Point o' is located on the perpendicular bisector of line ab, and the equation of the perpendicular bisector is:

[0103]

[0104] In the formula: a is the ordinate value of the detection point coordinate A (0, a) on the rotating shaft surface in the vertical direction after the shaft is eccentric; b is the lateral coordinate value of the detection point coordinate B (b, 0) on the rotating shaft surface in the horizontal direction after the shaft is eccentric.

[0105] Since the length of o′b is the radius r of the rotating shaft, according to the perpendicular bisector equation and the Pythagorean theorem, the eccentric trajectory equation group of the rotating shaft is obtained to calculate the o′ coordinate; the eccentric trajectory equation group is:

[0106]

[0107] In the formula: a is the ordinate value of the detection point coordinate A (0, a) on the shaft surface in the vertical direction after the shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the shaft surface in the horizontal direction after the shaft is eccentric; x1 and y1 are the abscissa value and ordinate value of the center o′ of the shaft after the shaft is eccentric, respectively.

[0108] ② When the shaft 1 is subjected to a vertical upward load, according to the coordinates of points A (0, a) and B (b, 0), the equation of the straight line ab is:

[0109]

[0110] Wherein: a is the ordinate value of the detection point coordinate A (0, a) on the rotating shaft surface in the vertical direction after the rotating shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the rotating shaft surface in the horizontal direction after the rotating shaft is eccentric;

[0111] Point o' is located on the perpendicular bisector of line ab, and the equation of the perpendicular bisector is:

[0112]

[0113] Wherein: a is the ordinate value of the detection point coordinate A (0, a) on the rotating shaft surface in the vertical direction after the rotating shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the rotating shaft surface in the horizontal direction after the rotating shaft is eccentric;

[0114] Since the length of o′b is the radius r of the rotating shaft, according to the perpendicular bisector equation and the Pythagorean theorem, the eccentric trajectory equation group of the rotating shaft is obtained to calculate the o′ coordinate; the eccentric trajectory equation group is:

[0115]

[0116] In the formula: a is the ordinate value of the detection point coordinate A (0, a) on the shaft surface in the vertical direction after the shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the shaft surface in the horizontal direction after the shaft is eccentric; x1 and y1 are the abscissa value and ordinate value of the center o′ of the shaft after the shaft is eccentric, respectively.

[0117] In addition, the specific direction of the eccentricity of the shaft 1 is also related to its rotation mode. For example, when the shaft 1 is subjected to a vertical downward load, when the shaft 1 is based on a certain end surface and the shaft 1 rotates in a clockwise direction, the shaft 1 is eccentric to the bottom of the X-axis and is located on the positive half axis of the X-axis. The specific schematic diagram is as follows: Figure 6 As shown; when the shaft 1 is still based on the above end surface and the shaft 1 rotates counterclockwise, the shaft 1 is eccentric to the bottom of the X-axis and is located on the negative half axis of the X-axis. The specific schematic diagram is as shown Figure 5 As shown; the above two situations are the differences in the eccentric positions of the rotating shaft 1 in practice, but in the process of using the above method to study, it is only necessary to directly substitute the actual data of the two detection points A (0, a) and B (b, 0) into the above formula to obtain the horizontal and vertical coordinate values ​​of the specific center o′ respectively.

[0118] like Figure 6 As shown, in step S32: the value θ of the deflection angle is obtained according to the following formula:

[0119]

[0120] Where: x1 and y1 are the horizontal and vertical coordinate values ​​of the center o' after the shaft is eccentric.

[0121] The offset angle refers to the acute angle between the line connecting the center of the journal and the center of the bearing and the load line. In mechanical design, the journal refers to the part of the shaft 1 that matches the bearing. In this application, the journal center is the center o' of the shaft 1 after the offset, the bearing center is the center o(0,0) of the bushing 201, and the load line refers to the straight line where the load is applied.

[0122] According to the definition and value of the load line and the offset angle, the actual angle of eccentricity of the rotating shaft 1 can be determined. At this time, the intersection of the extended line of the connecting line of the journal center and the bearing center of the sliding bearing and the lubricating oil film 3 is the minimum thickness position of the lubricating oil film 3 after the rotating shaft 1 is eccentric.

[0123] On this basis, the minimum thickness h of the lubricating oil film 3 is obtained according to the following formula:

[0124] h=c(1+εcosθ)

[0125] In the formula: c is the radial clearance of the bearing; ε is the eccentricity; θ is the offset angle.

[0126] The radial clearance of the bearing is also called the radius clearance: it refers to the difference between the actual radius of the bushing and the radius of the shaft neck; eccentricity: ε = e / c, where: e is the eccentricity, which refers to the distance between the center o′ of the rotating shaft after eccentricity and the center o of the bearing; c is the radial clearance of the bearing.

[0127] In step S33: according to the minimum thickness position of the lubricating oil film 3, multiple electromagnets with a distance less than s from the position are determined, and the current passing through the multiple electromagnets is adjusted by the controller to be I i +ΔI i That is, after the eddy current displacement sensor assembly detects the eccentricity of the shaft 1 for the first time, the electromagnet is adjusted to start powering on, and the current is I i , I i is an initial, large adjustment current, which is used to quickly respond to the control of the controller and improve the lubrication effect of the area corresponding to the lubricating oil film 3; the eddy current displacement sensor component detects the eccentric position of the shaft 1 again to obtain the minimum oil film thickness position, and continues to adjust the above-mentioned electromagnet. i Increase or decrease the incremental current ΔI based on i , ΔI i It is a smaller adjustment current used to make fine adjustments based on the existing current to further optimize the lubrication effect. In addition, according to the commonly used sliding bearings, the distance s is greater than the size of the electromagnet itself.

[0128] At this point, the controller has completed one regulation of each electromagnet. However, since the closed-loop feedback control system always uses the eddy current displacement sensor component to detect the eccentric position of the rotating shaft 1 in real time, when the minimum thickness h of the lubricating oil film 3 has not reached the maximum, the controller will continue to regulate the current in each electromagnet, and eventually the thickness of the lubricating oil film 3 will tend to be uniform, that is: in step S4: the above steps are repeatedly iterated until the minimum oil film thickness value of the lubricating oil film 3 is the maximum, and the lubrication effect of the lattice intelligent sliding bearing is the best.

[0129] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Dot matrix intelligent sliding bearing, characterized in that: include: Magnetic liquid sliding bearing body, closed-loop feedback control system, wherein: The magnetic liquid sliding bearing body comprises a bushing sleeved on the outer surface of a rotating shaft, a lubricating oil film formed by magnetic liquid is arranged between the bushing and the rotating shaft, and the lubricating oil film is used to realize the lubricated rotation of the rotating shaft in the magnetic liquid sliding bearing body; on this basis, n rows of electromagnetic arrays are evenly arranged along the circumference of the bushing, 4≤n≤20, each row of the electromagnetic array is evenly spaced with m mounting holes, 3≤m≤10, each mounting hole is provided with an electromagnet, each electromagnet is connected to a control wire, and the control wires are connected to a closed-loop feedback control system; Closed-loop feedback control system, including: An eddy current displacement sensor assembly, comprising a first eddy current displacement sensor and a second eddy current displacement sensor which are both arranged on one side of a magnetic liquid sliding bearing body, wherein the first eddy current displacement sensor and the second eddy current displacement sensor are located in the same vertical plane, and the plane coincides with the radial cross section of the rotating shaft, on this basis, the angle between the two eddy current displacement sensors is 90°, the first eddy current displacement sensor is used to measure the vertical displacement of the rotating shaft, and convert the measured data into an original displacement signal through a converter; the second eddy current displacement sensor is used to measure the horizontal displacement of the rotating shaft, and convert the measured data into an original displacement signal through a converter; The controller is connected to each electromagnet and the eddy current displacement sensor assembly. The controller receives and processes the original displacement signal emitted by the eddy current displacement sensor assembly, and then emits a control signal for controlling the magnitude of the coil current in each electromagnet, so as to adjust the thickness of the lubricating oil film to be uniform.

2. The lattice type intelligent sliding bearing according to claim 1 is characterized in that: In the magnetic liquid sliding bearing body, the bushing is stepped, including an integrally arranged step portion and a mounting portion, and the mounting hole is arranged on the outer wall of the mounting portion. In addition, on the mounting portion, a wire channel is arranged on one side of each electromagnetic array, and the wire channel is connected to each mounting hole in the electromagnetic array through a wire groove, and one end of a plurality of wire channels is connected through a circular groove, and the circular groove is arranged inside the step portion; On this basis, a coil outlet is also provided on the step portion, and the coil outlet is connected to the circular groove; in each column of the electromagnetic array, the control wire in the mounting hole is collected inside the wire channel through the wire groove; on the bushing, the control wires inside several wire channels are collected inside the circular groove, and after extending out of the magnetic liquid sliding bearing body from the coil outlet, they are connected to the closed-loop feedback control system.

3. The lattice type intelligent sliding bearing according to claim 2 is characterized in that: The lattice intelligent sliding bearing also includes: a sleeve for covering the outer wall of the mounting portion of the bushing, one end of the sleeve abuts against the step portion, and the wall thickness of the sleeve is the same as the thickness of the step portion, and the other end of the sleeve is arranged on one side of the end of the mounting portion through a folding portion, and on the folding portion, a first sealing ring is also provided on the side close to the rotating shaft through a first mounting groove, which is used to prevent the magnetic liquid from leaking from between the folding portion of the sleeve and the rotating shaft.

4. The lattice type intelligent sliding bearing according to claim 3 is characterized in that: The lattice-type intelligent sliding bearing also includes a bearing seat, the inner wall of the bearing seat is in contact with the outer wall of the sleeve and the outer wall of the step portion. In addition, the magnetic liquid sliding bearing body is provided with an end cover at one end close to the step portion, and the end cover is provided with a through hole, which is connected to the coil outlet for the control wire to pass through. On this basis, the end cover is connected to the bearing seat by a fixing screw, and the end cover is also provided with a second sealing ring on the side close to the rotating shaft through a second mounting groove to prevent the magnetic liquid from leaking from between the end cover and the rotating shaft; The sleeve, bushing and bearing seat are connected by a connecting key.

5. The lattice type intelligent sliding bearing according to claim 4 is characterized in that: In the bushing, a threaded hole is provided at the bottom of each mounting hole on the mounting portion for cooperating with a bolt to tighten the electromagnet to the inside of the mounting hole; The control wire is bonded to the wire groove, the wire channel, and the inside of the circular groove by hot-melt adhesive.

6. An intelligent lubrication method for a lattice type intelligent sliding bearing, applied to the lattice type intelligent sliding bearing according to any one of claims 1 to 5, characterized in that: The intelligent lubrication method comprises: S1. Using a motor to provide rotational power to the shaft, the shaft starts to rotate, and the lattice-type intelligent sliding bearing uses a lubricating oil film body for non-electrical lubrication; S2. Under the action of load, the shaft gradually deviates from the center of the bushing during rotation, and the eccentricity causes the shaft to produce horizontal and vertical displacements; two eddy current displacement sensors are used to collect the original displacement signals of the shaft in the horizontal and vertical directions respectively; S3, after processing the original displacement signal by the controller, output a current signal for regulating the current in the coil of the electromagnet; S4. Repeat the above steps until the minimum oil film thickness of the lubricating oil film is maximized. At this time, the lubrication effect of the lattice intelligent sliding bearing is optimal.

7. The intelligent lubrication method for a matrix type intelligent sliding bearing according to claim 6, characterized in that: In step S2, under the action of load, the shaft gradually produces eccentricity away from the center of the bushing during the rotation process, and the eccentricity causes the shaft to produce horizontal and vertical displacements. On this basis, taking the center o of the bushing as the origin, its coordinates are o (0, 0), the horizontal direction is the X-axis, and the vertical direction is the Y-axis. The two eddy current displacement sensors are used to measure the detection point coordinates A (0, a) on the vertical direction of the shaft surface after the eccentricity, and the detection point coordinates B (b, 0) on the horizontal direction of the shaft surface, and the two-point coordinate data are converted into original displacement signals through a converter and sent to the controller.

8. The intelligent lubrication method for a matrix type intelligent sliding bearing according to claim 7, characterized in that: In step S3, after the original displacement signal is processed by the controller, a current signal for regulating the current in the coil of the electromagnet is output, which specifically includes: S31, according to the coordinate data of points A (0, a) and B (b, 0), the eccentric trajectory equation group of the rotating shaft is obtained, and the coordinate of the center o′ of the rotating shaft after the eccentricity is obtained; S32, obtaining the value of the deflection angle according to the coordinates of the center o' of the rotating shaft after the deflection, and determining the geometric position and specific thickness value h of the minimum oil film thickness according to the value of the deflection angle; S33, select multiple electromagnets located within the distance s according to the position, and use the controller to adjust the current passing through the multiple electromagnets to I i +ΔI i , where s is larger than the size of the electromagnet itself; I i It is an initial, large adjustment current used to quickly respond to the control of the controller and improve the lubrication effect of the area corresponding to the lubricating oil film; ΔI i It is a smaller adjustment current used to make fine adjustments based on the existing current to further optimize the lubrication effect.

9. The intelligent lubrication method for a matrix type intelligent sliding bearing according to claim 8, characterized in that: In step S31: assuming that the radius of the bushing is R, the radius of the shaft is r, the center of the shaft after eccentricity is o′, and the coordinates of o′ are o′(x1, y1); ① When the shaft is subjected to a vertical downward load, according to the coordinates of points A (0, a) and B (b, 0), the equation of the straight line ab is: ， Where: a is the ordinate value of the detection point coordinate A (0, a) on the rotating shaft surface in the vertical direction after the shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the rotating shaft surface in the horizontal direction after the shaft is eccentric; Point o' is located on the perpendicular bisector of line ab, and the equation of the perpendicular bisector is: ， Where: a is the ordinate value of the detection point coordinate A (0, a) on the rotating shaft surface in the vertical direction after the shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the rotating shaft surface in the horizontal direction after the shaft is eccentric; Since the length of o′b is the radius r of the rotating shaft, according to the perpendicular bisector equation and the Pythagorean theorem, the eccentric trajectory equation group of the rotating shaft is obtained to calculate the o′ coordinate; the eccentric trajectory equation group is: ， Where: a is the ordinate value of the detection point coordinate A (0, a) on the rotating shaft surface in the vertical direction after the rotating shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the rotating shaft surface in the horizontal direction after the rotating shaft is eccentric; x1 and y1 are the abscissa value and ordinate value of the center o′ of the rotating shaft after the rotating shaft is eccentric, respectively; ② When the shaft is subjected to a vertical upward load, according to the coordinates of points A (0, a) and B (b, 0), the equation of the straight line ab is: ， Where: a is the ordinate value of the detection point coordinate A (0, a) on the rotating shaft surface in the vertical direction after the shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the rotating shaft surface in the horizontal direction after the shaft is eccentric; Point o' is located on the perpendicular bisector of line ab, and the equation of the perpendicular bisector is: ， Where: a is the ordinate value of the detection point coordinate A (0, a) on the rotating shaft surface in the vertical direction after the shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the rotating shaft surface in the horizontal direction after the shaft is eccentric; Since the length of o′b is the radius r of the rotating shaft, according to the perpendicular bisector equation and the Pythagorean theorem, the eccentric trajectory equation group of the rotating shaft is obtained to calculate the o′ coordinate; the eccentric trajectory equation group is: ， In the formula: a is the ordinate value of the detection point coordinate A (0, a) on the rotating shaft surface in the vertical direction after the rotating shaft is eccentric; b is the abscissa value of the detection point coordinate B (b, 0) on the rotating shaft surface in the horizontal direction after the rotating shaft is eccentric; x1 and y1 are the abscissa value and ordinate value of the center o′ of the rotating shaft after the rotating shaft is eccentric, respectively.

10. The intelligent lubrication method for a matrix type intelligent sliding bearing according to claim 9, characterized in that: In step S32: the value θ of the deflection angle is obtained according to the following formula: ， Where: x1 and y1 are the horizontal and vertical coordinate values ​​of the center o′ of the rotating shaft after eccentricity; On this basis, the minimum thickness h of the lubricating oil film is obtained according to the following formula: ， Where: c — radial clearance of bearings; ε — eccentricity; θ —Offset angle.

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