CN114233758A - Water-lubricated bearing system with active control separation function and use method thereof - Google Patents

Water-lubricated bearing system with active control separation function and use method thereof Download PDF

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Publication number
CN114233758A
CN114233758A CN202111622650.6A CN202111622650A CN114233758A CN 114233758 A CN114233758 A CN 114233758A CN 202111622650 A CN202111622650 A CN 202111622650A CN 114233758 A CN114233758 A CN 114233758A
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CN
China
Prior art keywords
water
bearing
friction
stern shaft
stern
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Withdrawn
Application number
CN202111622650.6A
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Chinese (zh)
Inventor
梁鹏
李兴阳
郭峰
张晓寒
陈召宝
刘成龙
韩素立
徐洋
王宗斌
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Jinan Shunmao Test Instrument Co ltd
Qingdao University of Technology
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Jinan Shunmao Test Instrument Co ltd
Qingdao University of Technology
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Application filed by Jinan Shunmao Test Instrument Co ltd, Qingdao University of Technology filed Critical Jinan Shunmao Test Instrument Co ltd
Priority to CN202111622650.6A priority Critical patent/CN114233758A/en
Publication of CN114233758A publication Critical patent/CN114233758A/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/22—Sliding surface consisting mainly of rubber or synthetic rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N15/00—Lubrication with substances other than oil or grease; Lubrication characterised by the use of particular lubricants in particular apparatus or conditions
    • F16N15/04—Lubrication with substances other than oil or grease; Lubrication characterised by the use of particular lubricants in particular apparatus or conditions with water
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00—Investigating materials by mechanical methods
    • G01N19/02—Measuring coefficient of friction between materials

Abstract

The invention relates to the technical field of friction and wear of water-lubricated rubber bearings, in particular to a water-lubricated bearing system with an active control separation function, which comprises a stern shaft system and an active control system arranged on the stern shaft system, wherein the active control system comprises an execution unit, the execution unit comprises a water separator, the water separator is positioned on one side of the water-lubricated rubber bearing, the inner wall of the water separator is provided with 4 water outlets, each water outlet corresponds to 1 nesting mechanism, each nesting mechanism can control the water flow and the pressure of the corresponding water outlet, liquid water film force with controllable direction and size is applied to a stern shaft, and the stern shaft is pushed to be separated from a friction contact part by using the liquid water film force between the water separator and the stern shaft; the bearing overcomes the technical defects that the friction can only be optimized, passively born and cannot be reduced fundamentally at present, can reduce the bearing abrasion, obviously prolongs the service life of the bearing, and is applied to a long-service-life bearing system of marine equipment such as ships and the like.

Description

Water-lubricated bearing system with active control separation function and use method thereof
The technical field is as follows:
the invention relates to the technical field of water-lubricated rubber bearing friction and wear, in particular to a water-lubricated bearing system with an active control separation function, which can quickly separate two friction pairs, reduce bearing wear and prolong the service life of a bearing.
Background art:
at present, oil lubricated bearings are also adopted as supporting parts by the propellers of most domestic ships. And the oil-lubricated bearing has oil leakage in the operation process, which can seriously pollute the water environment. The water lubricated bearing can thoroughly solve the problem that ship bearing oil leaks and pollutes the environment, and the control range of passive sonar can be reduced to the ship loading water lubricated bearing simultaneously, improves ship hiding, survivability. Compared with an oil-lubricated bearing, the water-lubricated bearing using water as a lubricating medium has the characteristics of low use cost, environmental friendliness, simple structure, good flame retardance, good cooling effect and the like. Currently, water lubricated bearings have begun to be used in marine vessels, water turbines, water pumps, and the like.
However, the bearing bush of the innermost layer of the water lubricated bearing is usually made of rubber, plastic and the like, and the hardness of the bearing bush is obviously lower than that of the metal material of the stern shaft, so that if the bearing bush is suddenly impacted by external load, ocean current and the like, the stern shaft and the bearing bush are in direct frictional contact, the bearing bush is easily worn quickly, the service life of the water lubricated bearing is obviously shortened, the use cost of marine equipment such as ships and the like is also increased, and the maintenance frequency of the equipment is increased. At present, most researches are carried out on the abrasion problem of the water-lubricated bearing to optimize the bearing from the aspect of the material of the bearing bush, namely, the abrasion of the bearing is reduced by improving the abrasion resistance of the material of the bearing bush, but the method does not fundamentally reduce the friction between the stern shaft and the bearing, the friction is still generated, and the bearing bush still bears the frictional abrasion, so the method for improving the abrasion resistance of the material belongs to a passive method, and the effects of reducing the friction and the abrasion are not ideal. Therefore, a system capable of actively separating the friction parts of the stern shaft and the bearing is designed to be used for quickly separating the two friction pairs, reducing the abrasion of the bearing and prolonging the service life of the bearing, and has important significance.
The invention content is as follows:
the invention aims to overcome the defects that the wear resistance of a bearing bush material is only passively improved and two friction parts are not actively and quickly separated in the conventional method, and designs a control system which can sense and judge whether the bearing is severely rubbed or not in real time and actively separate a stern shaft-water lubrication bearing according to the friction parts.
In order to achieve the purpose, the invention relates to a water lubrication bearing system with an active control separation function, which comprises a main body structure and an active control system arranged on a stern shaft system, wherein the active control system comprises an execution unit, the execution unit comprises a water separator, the water separator is positioned on one side of the water lubrication bearing, 4 water outlets are arranged on the inner wall of the water separator, each water outlet corresponds to 1 nesting mechanism, each nesting mechanism can control the water flow and the pressure of the corresponding water outlet, liquid water film force with controllable direction and size is applied to the stern shaft, and the stern shaft is pushed to be separated from a friction contact part by using the liquid water film force between the water separator and the stern shaft.
Furthermore, the active control system also comprises a sensing unit and a judging unit, wherein the sensing unit is used for measuring the displacement of the axis of the stern shaft, the friction torque of the water-lubricated bearing and the load borne by the water-lubricated bearing; the judging unit is used for acquiring physical quantities measured by the sensing unit, calculating to obtain the axle center coordinate of the stern shaft and the friction coefficient of the water-lubricated bearing, judging whether the bearing is in a normal working state or not, and the industrial personal computer outputs an execution signal to the nesting mechanism of the water segregator according to the state of the bearing.
Further, the sensing unit comprises a Y-direction displacement sensor, an X-direction displacement sensor, a torque tachometer and a load sensor, wherein the Y-direction displacement sensor and the X-direction displacement sensor are used for sensing the Y-direction and the X-direction distances between the two sensors and the stern shaft in real time; the torque tachometer is used for sensing the friction torque of the water lubrication bearing in the running process in real time; the load sensor is used for measuring the load borne by the water lubrication bearing system in real time; the judging unit comprises a data acquisition card and an industrial personal computer, the data acquisition card is connected with the sensing unit through a signal line, and the data acquisition card transmits the physical quantity measured by the sensing unit to the industrial personal computer through the signal line; the industrial personal computer can judge whether the bearing is in a normal working state according to the displacement signal, the friction torque signal and the load signal which are collected in real time, and outputs an execution signal to the nesting mechanism of the water separator according to the state of the bearing.
Further, the execution unit further comprises a hydraulic circuit, and the hydraulic circuit is used for supplying water to the water separator; the hydraulic circuit includes a water tank, a filter, a hydraulic pump, and an overflow valve. The water tank, the filter, the hydraulic pump and the water separator are sequentially connected through pipelines; the hydraulic pump pumps water out of the water tank, and the filter filters the water flowing out of the water tank and conveys the water to the water separator.
Furthermore, nesting holes are formed in the water separator at positions of every 90 degrees in the circumferential direction, a nesting mechanism is arranged in each nesting hole, and water outlets are formed in the bottoms of the nesting holes; and a water inlet is arranged beside each nesting hole and is communicated with the nesting holes through a flow passage.
Furthermore, the main structure of the nesting mechanism comprises a tightening screw block, a homogenizing press plate, piezoelectric ceramics, an output press block, an extrusion cylinder, an elastic deformation sheet and a fixed cylinder; a homogenizing press plate, piezoelectric ceramics, an output press block and an extrusion cylinder are arranged below the tightening screw block in sequence; a hollow cavity is formed between the output pressing block and the extrusion cylinder; the hollow cavity is used for storing water flowing in from the water inlet; the fixed barrel is of a barrel-shaped structure with an upper opening, the extrusion barrel can slide in contact with the inner wall of the fixed barrel, a throttling cavity is formed between the extrusion barrel and the fixed barrel, and the extrusion barrel is circumferentially provided with an introduction hole and a pushing ring; the introduction hole allows water to enter the throttling cavity from the middle cavity; an elastic deformation sheet is arranged below the pushing ring; the position of the end part conical structure of the elastic deformation sheet is preferably not blocked by the leading-out hole; a manifold is arranged below the fixed cylinder, and the bottom of the fixed cylinder is provided with leading-out holes which can lead water in the throttling cavity out to the manifold; the manifold is communicated with the water outlet.
Furthermore, the extrusion cylinder comprises an upper column and a lower column, the upper column and the lower column respectively realize the centering function of the output pressing block and the elastic deformation sheet, and the coaxiality tolerance of the upper column and the lower column is 5 mu m.
Further, the working principle of the water separator is as follows: when the nesting mechanism is assembled, the tightening screw block is rotated to push the lower homogenizing press plate, so that pre-tightening force is applied to the piezoelectric ceramic; the homogenizing press plate can homogenize the extruding force of the tightening screw block, so that the damage of the ceramic wafer caused by uneven stress due to the direct application of the homogenizing press plate to the piezoelectric ceramic is avoided; when the water separator works, the flange on the outer wall of the water separator prevents external water from entering the nesting hole; the hollow cavity stores water flowing in from the water inlet; the piezoelectric ceramic adopts a stack type piezoelectric ceramic piece, and the driving voltage of the piezoelectric ceramic is controlled by utilizing the characteristic that the piezoelectric ceramic is driven by voltages with different amplitudes and has different elongation amounts so as to output expected micro displacement; the output pressing block uniformly outputs the displacement of the piezoelectric ceramic to the extrusion cylinder, water flow enters the throttling cavity from the hollow cavity through the introduction holes distributed on the extrusion cylinder, the extrusion cylinder transmits the displacement to the pushing ring in the throttling cavity, the pushing ring extrudes the elastic deformation sheet to cause the elastic deformation sheet to deform, the conical structure at the end part of the elastic deformation sheet gradually plugs the leading-out hole of the fixed cylinder, the aperture is reduced, and the water flow is adjusted; the water in the throttling cavity is led out to the collecting cavity through the leading-out hole, and the position of the fixed cylinder is always unchanged in the whole working process; the lower part of the fixed cylinder is provided with a manifold, and the inclined plane of the fixed cylinder has the function of flow-collecting guide, so that water flowing out of the leading-out hole is collected to the water outlet hole.
Further, on the basis of considering the measuring ranges of the Y-direction displacement sensor and the X-direction displacement sensor, planning the circumferential positions of the Y-direction displacement sensor and the X-direction displacement sensor on the left end surface of the water separator and the radial distances delta Y and delta X between the Y-direction displacement sensor and the X-direction displacement sensor and the inner wall of the water separator, and precisely installing the Y-direction displacement sensor and the X-direction displacement sensor according to the planning; measuring the inner bore radius R of the water separatorbAnd radius of stern shaft RsSo as to determine the radius clearance c between the water segregator and the stern shaft as Rb-RsAnd the method is used for calculating the axis coordinates (x ', y') of the stern shaft.
The invention discloses a using method of a water lubrication bearing system with an active separation control function, which comprises the following steps:
step 1, measuring the axis coordinates (x ', y') of a stern shaft and the variation range of the friction coefficient f of a water lubrication bearing through a sensing unit, and judging whether the three parameters are always within the allowable variation range of normal working conditions;
step 2, if the three parameters are in the normal variation range, the active control system only starts the sensing unit and the judging unit, and the execution unit does not need to be started;
step 3, if the friction coefficients in the three parameters exceed a normal range in the process of continuously rotating the stern shaft for three circles, indicating that serious friction exists between the stern shaft and the water-lubricated bearing, judging which quadrant the friction part is in by using a sensing unit and starting an execution unit, taking the third quadrant as an example of the friction part, improving the driving voltage of the piezoelectric ceramics in the left side and lower side nesting mechanism, extending the piezoelectric ceramics to push an output pressing block to move downwards and further push an extruding cylinder to move, and a pushing ring of the extruding cylinder further promotes an elastic deformation sheet to bend, so that the throttling aperture and the water yield are reduced, and the pressure of left side and lower side water outlets of the stern is improved, so that the resultant force of the right oblique upper side is applied to the stern shaft to promote the shaft to move to the right oblique upper side, and the stern gradually leaves the friction contact part;
step 4, after that, the sensing unit continuously measures in real time, if the friction part of the stern shaft and the bearing is still in the III-th quadrant through judgment, the voltage at two ends of the piezoelectric ceramic is continuously increased according to the step 3, the throttling aperture is reduced, and finally the friction part of the stern shaft and the bearing is completely separated, so that the time and the process of the friction of the bearing are actively shortened, and the friction and the abrasion of the water-lubricated bearing are reduced; in addition, when the piezoelectric ceramic is shortened, the elasticity of the elastic deformation sheet can drive the connecting part to restore to the initial position.
The working mode of the water lubrication bearing system with the active control separation function comprises the following steps: the method comprises the steps that coordinates of the axle center of a stern shaft and the friction coefficient of a bearing are measured in real time by two displacement sensors and a torque tachometer, signals are transmitted to an industrial personal computer by a data acquisition card, a program in the industrial personal computer automatically judges whether three parameters exceed a normal working condition change range, whether a water-lubricated rubber bearing is in friction contact with the stern shaft or not and a friction position is determined, once the axle center coordinates and the friction coefficient exceed the normal working condition range, the driving voltage of piezoelectric ceramics in a water separator is rapidly increased, the elastic deformation sheet can be pushed to be bent by the extension of the ceramic sheet, the throttling aperture is reduced, the water outlet hole pressure of the water separator is increased, the stern shaft is finally pushed to move, the position far away from the position where the water-lubricated rubber bearing is in friction, and the abrasion between two friction pairs is rapidly and actively reduced.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a control system capable of actively and automatically separating water from a lubricated rubber bearing and a stern shaft, which can actively push the stern shaft to separate from a friction part of the bearing by using the pressure of water flow once the health state of the bearing is monitored and the bearing and the stern shaft are in frictional contact, and overcomes the technical defects that the current bearing material can only be optimized, the friction is passively borne and the friction cannot be fundamentally reduced.
2. The technology for reducing the friction wear of the stern shaft and the water-lubricated rubber bearing can separate the friction contact part of the stern shaft and the water-lubricated rubber bearing on line in real time under the normal working condition of the stern shaft without shutdown operation; in addition, the invention utilizes the liquid water film force between the water separator and the screw shaft to push the screw shaft instead of pushing the screw shaft by the contact force of solid parts, and the flexibility of the water film avoids the secondary friction abrasion between the screw shaft and the solid pushing piece.
3. The invention carries out combined analysis on the axle center coordinate of the stern shaft and the friction coefficient of the bearing, thereby not only judging whether the water lubricating rubber bearing is contacted with the stern shaft in real time, but also judging the position of the friction; the bearing contact friction judgment rule requires that the friction coefficient in the three measurement parameters must exceed the variation range under the normal working condition, and the phenomenon must last for a period of time to be identified as that the bearing and the stern shaft generate direct contact friction, and the judgment rule can avoid the phenomenon that the stern shaft instantly contacts the bearing and then is automatically separated due to some transient external loads.
4. The water separator is arranged on the side surface of the water lubrication bearing, so that the internal structure of the water lubrication bearing cannot be damaged, the service life of the bearing under severe heavy-load working conditions can be prolonged, and the water separator is applied to a long-life bearing system of marine equipment such as ships and the like.
5. The water separator is an important component for adjusting the water outlet flow and changing the stress of the screw shaft, and a matched hydraulic circuit is simple and has strong operability; the elastic deformation sheet arranged inside can freely adjust the size of the throttling aperture, the piezoelectric ceramic pushing the elastic deformation sheet has high-frequency response characteristic (the reaction time is 1ms), the elastic deformation sheet can be pushed at the moment when the bearing and the stern shaft are in direct frictional contact, the stress of the stern shaft is rapidly changed, the friction part of the stern shaft and the bearing bush is separated, the friction coefficient of the bearing is rapidly reduced, and the abrasion of the bearing bush is reduced; in addition, when the piezoelectric ceramic plate is shortened, the elasticity of the elastic deformation plate can drive the connecting part to restore to the initial position.
Description of the drawings:
fig. 1 is a schematic diagram of a main structure of a water-lubricated bearing system with an active control separation function according to the present invention, wherein (a) is a stern shaft system, a sensing unit and a determining unit, and (b) is a determining unit and an executing unit.
Fig. 2 is a schematic diagram of the mounting positions of the Y-direction displacement sensor and the X-direction displacement sensor according to the present invention, wherein (a) is the axial mounting position of the displacement sensor, and (b) is the circumferential mounting position of the displacement sensor.
Fig. 3 is a schematic diagram of the principle of the friction structure between the stern shaft and the bearing bush after the stern shaft is impacted.
Fig. 4 is a schematic diagram of the overall structure of the water separator according to the present invention, wherein (a) is a front view of the water separator, (b) is a sectional view of the water separator, and (c) is an enlarged view of an internal nesting mechanism.
Fig. 5 is a schematic view showing the principle of the elastic deformation sheet according to the present invention before and after deformation, wherein (a) is the elastic deformation sheet before deformation and (b) is the elastic deformation sheet after deformation.
Fig. 6 is a schematic diagram of the calculation of the axial center coordinates of the stern shaft according to the present invention, wherein (a) is the non-eccentric condition and (b) is the normal working eccentric condition.
FIG. 7 shows the variation range of the measurement parameters of the sensing unit under normal conditions, wherein (a) is the variation range of the axis coordinate of the stern shaft, and (b) is the variation range of the friction coefficient of the water-lubricated rubber bearing.
Fig. 8 is a schematic block diagram illustrating the control principle of the active control system according to the present invention.
Fig. 9 is a schematic flow chart of the working steps of the water-lubricated bearing system with active control function according to the invention.
Fig. 10 is a quadrant view of a friction generating portion of the water-lubricated bearing system according to the invention.
Fig. 11 is a schematic view of the overall structure of the elastically deformable sheet according to the present invention.
The specific implementation mode is as follows:
the invention is further described by the following examples in conjunction with the accompanying drawings.
Example 1:
the main structure of the water lubrication bearing system with the active control separation function comprises a stern shaft system and an active control system arranged on the stern shaft system, wherein the active control system comprises a sensing unit, a judging unit and an executing unit; the stern shaft system comprises a stern shaft 21 and a water lubrication rubber bearing 22; the sensing unit is used for measuring the displacement of the axis of the stern shaft 21, the friction torque of the water lubrication rubber bearing 22 and the load borne by the water lubrication rubber bearing 22; the judging unit is used for acquiring physical quantities measured by the sensing unit, calculating to obtain the axis coordinate of the stern shaft 21 and the friction coefficient of the water-lubricated rubber bearing 22, judging whether the execution unit is started, and outputting an execution signal to the execution unit if the execution unit needs to be started; the execution unit mainly comprises a water separator 10, the water separator 10 is sleeved outside a stern shaft 21 and is positioned on the left side of a water-lubricated rubber bearing 22, the inner diameter of the water separator 10 is larger than the outer diameter of the stern shaft 21, 4 water outlets are formed in the inner wall of the water separator 10 in the circumferential direction, each water outlet corresponds to 1 nesting mechanism 12, each nesting mechanism 12 can control the water flow and pressure of the corresponding water outlet, liquid water film force with controllable direction and size is applied to the stern shaft 21, and the stern shaft is pushed to be separated from a friction contact part by the aid of the liquid water film force between the water separator 10 and the stern shaft 21.
The sensing unit comprises a Y-direction displacement sensor 1, an X-direction displacement sensor 2, a torque tachometer 3 and a load sensor 4, wherein the Y-direction displacement sensor 1 and the X-direction displacement sensor 2 are fixedly arranged above and at the right of the stern shaft 21 and used for sensing the distance between the sensors and the stern shaft in the X direction and the Y direction in real time; two sides of the torque tachometer 3 are respectively connected with the stern shaft 21 and the motor 23 through a first coupler 24 and a second coupler 25, and the torque tachometer 3 is used for sensing the friction torque of the water-lubricated rubber bearing in the running process in real time; the load sensor 4 is arranged at the bottom of the water lubrication rubber bearing 22, can measure the load borne by the water lubrication rubber bearing system in real time, and provides preparation for calculating the friction coefficient in real time.
The Y-direction displacement sensor 1 and the X-direction displacement sensor 2 are eddy current displacement sensors capable of working under water, the measuring range is 2mm, the measuring precision can reach 1 mu m, the bandwidth is 50 Hz-50 KHz, the measuring precision of the sensors is insensitive to the influence of water media, the two sensors are respectively arranged above and at the right of the stern shaft 21 (shown in figure 2b), the X-direction and Y-direction distances between the sensors and the stern shaft 21 can be sensed in real time, the X-direction and Y-direction coordinates of the shaft center of the stern shaft 21 can be obtained through conversion, and the Y-direction displacement sensor 1 and the X-direction displacement sensor 2 are fixed in the whole process.
The torque tachometer 3 is a torque tachometer capable of working underwater, or a waterproof shell and a sealing device are arranged on a common torque tachometer, and the torque tachometer 3 can sense the friction torque of the water-lubricated rubber bearing in the running process in real time and calculate to obtain the friction coefficient. Because the water lubricated rubber bearing is often interfered by external load in use, the direct friction between the stern shaft 21 and the bearing bush of the water lubricated rubber bearing 22 is caused (figure 3), and the system can be used as a basis for judging whether the bearing system is healthy or not by monitoring the measurement parameters of four sensors in real time.
The judging unit comprises a data acquisition card 5, an industrial personal computer 6 and a signal amplifier 7, the data acquisition card 5 is respectively connected with the Y-direction displacement sensor 1, the X-direction displacement sensor 2, the torque tachometer 3 and the load sensor 4 through signal lines, and the data acquisition card 5 transmits physical quantities measured by the Y-direction displacement sensor 1, the X-direction displacement sensor 2, the torque tachometer 3 and the load sensor 4 to the industrial personal computer 6 through the signal lines; the industrial personal computer 6 is embedded with a program written by software, whether the bearing is in a normal working state or not can be judged according to a displacement signal, a friction torque signal and a load signal which are collected in real time, the industrial personal computer 6 outputs an execution signal according to the state of the bearing, and the signal amplifier 7 is required to amplify and transmit the electric signal to the execution unit because the electric signal output from the industrial personal computer 6 is weak.
The data acquisition card 5 adopts a PCI-6024E multifunctional data acquisition card, and has 16-path single-end analog input with the sampling rate of 200KS/s and the resolution of 12 bits.
The execution unit further comprises a hydraulic circuit, and the hydraulic circuit is used for supplying water to the water separator 10; the hydraulic circuit comprises a water tank 8, a filter 9, a hydraulic pump 13 and an overflow valve 14. The water tank 8, the filter 9, the hydraulic pump 13 and the water separator 10 are connected in sequence through pipelines; the overflow valve 14 is connected with the hydraulic pump 13 through a pipeline, the hydraulic pump 13 pumps water out of the water tank 8, and the filter 9 filters the water flowing out of the water tank 8 and then conveys the water to the water separator 10.
The water separator 10 is of a hollow annular cylindrical structure and is sleeved on the stern shaft 21, the side face of the water separator is tightly connected with the left side of the water lubricating rubber bearing 22 through fasteners such as bolts, nesting holes 1001 are formed in the circumferential direction of the water separator 10 at positions of 90 degrees, the tops of the nesting holes 1001 are fixed and sealed through flanges 121, and a cylindrical curved surface is cut into a plane with a certain width at the contact position of the outer wall of the water separator 10 and the flanges 121, so that the flanges 121 are convenient to fix and seal; the bottom of the embedding hole 1001 is provided with a water outlet 1224; a water inlet 1213 is arranged at the right side of each nesting hole 1001, and the water inlet 1213 is communicated with the nesting holes 1001 through an oblique flow passage 1212; a group of nesting mechanisms 12 with the same structure are nested in the four nesting holes 1001, the four nesting mechanisms are all in the middle position in the axial direction of the water separator 10, and the nesting mechanisms 12 are used for adjusting the water outlet amount and the pressure of the water outlet 1224.
Taking the nesting mechanism 12 at a position of 90 ° in the circumferential direction as an example, as shown in fig. 4b and 4c, the main structure of the nesting mechanism 12 includes a tightening screw 122, a homogenizing pressure plate 123, a piezoelectric ceramic 124, an output pressure block 129, a squeezing barrel 1214, an elastic deformation sheet 1219 and a fixed barrel 1221; a homogenizing pressure plate 123, a piezoelectric ceramic 124, an output pressure block 129 and an extrusion cylinder 1214 are arranged below the tightening screw block 122 in sequence; a hollow cavity 1211 is formed between the output pressing block 129 and the extrusion cylinder 1214; the fixed cylinder 1221 is a cylindrical structure with an upper opening, the extrusion cylinder 1214 can slide in contact with the inner wall of the fixed cylinder 1221, a throttling cavity 1220 is formed between the extrusion cylinder 1214 and the fixed cylinder 1221, and 8 introduction holes 1217 and a pushing ring 1218 are uniformly distributed in the circumferential direction of the extrusion cylinder 1214; the inlet holes 1217 allow water flow from the central cavity 1211 into the throttle cavity 1220; an elastic deformation sheet 1219 is arranged below the pushing ring 1218; a funnel-shaped manifold 1223 is arranged below the fixed cylinder 1221, the bottom of the fixed cylinder is provided with an outlet hole 1222, and the outlet hole 1222 can lead the water in the throttle chamber 1220 to the manifold 1223; the manifold 1223 communicates with the outlet 1224.
The hollow cavity 1211 communicates with the water inlet 1213 through the inclined flow channel 1212 for storing the water flowing in from the water inlet 1213.
The extrusion cylinder 1214 comprises a circular plate 1201, an upper column 1215, a lower column 1216, introduction holes 1217 and an extrusion ring 1218, the top end of the upper column 1215 is tightly connected with the output pressing block 129, 8 introduction holes 1217 are uniformly distributed on the circular plate 1201, the extrusion ring 1218 is arranged below the circular plate 1201, and the extrusion ring 1218 can extrude the elastic deformation sheet 1219 to cause the deformation.
The elastic deformation sheet 1219 is made of 65Mn, the elastic deformation sheet 1219 is of a hollow annular bending structure, the bending part is of an elastic hinge structure, an included angle is formed between the inner side and the outer side of the bending part, and the outer side end of the bending part is of a conical structure; the elastic deformation sheet 1219 is sleeved on the outer wall of the lower column 1216, the bent part is pressed against the lower bottom plate of the fixed cylinder 1221, and the pushing ring 1218 is pressed against the upper surface of the outer side of the bent part; the pushing ring 1218 is pressed downward, and the angle of the bending part is increased (the inner side of the bending part is fixed, and the outer side of the bending part swings downward), so that the conical structure gradually blocks the outlet 1222, the aperture is reduced, and the adjustment of the water flow and the pressure is realized (shown in fig. 5).
The working principle of the water separator 10 is as follows: the flange 121 on the outer wall of the water separator 10 prevents external water from entering the nesting hole 1001 through the threads 126 and the sealing ring 125, and 6 screws are uniformly distributed on the periphery of the flange 121 to fix the flange 121 on the outer wall of the water separator 10; the tightening screw block 122 is arranged below the flange plate 121, the top of the tightening screw block 122 is provided with a straight groove 127, the tightening screw block 122 can be conveniently screwed by using a tool, the circumference of the tightening screw block 122 is of a cylindrical structure with external threads, and the tightening screw block 122 can be rotated to push the lower homogenizing pressure plate 123 when in use, so that pre-tightening force is applied to the piezoelectric ceramic 124; the homogenizing pressure plate 123 can homogenize the extruding force of the tightening screw block 122, so that damage caused by uneven stress on the ceramic chip due to direct application of the homogenizing pressure plate 123 to the piezoelectric ceramic 124 is avoided, and the sealing ring 125 arranged on the circumference of the homogenizing pressure plate 123 can further prevent water from invading into the nesting hole 1001; piezoelectric ceramics 124 are arranged below the homogenizing pressure plate 123, stacked piezoelectric ceramics are adopted, the piezoelectric ceramics have the characteristics of high rigidity and large output displacement, the driving voltage of the piezoelectric ceramics 124 is actively controlled by utilizing the characteristic that the piezoelectric ceramics 124 has different extension amounts under the driving of voltages with different amplitudes, so that expected micro displacement is output, and the piezoelectric ceramics 124 is connected with the judging unit through a signal line; the output pressing block 129 is arranged below the piezoelectric ceramic 124, can uniformly output the displacement of the piezoelectric ceramic 124 to the next element, and the sealing ring 125 arranged circumferentially can prevent the water in the hollow cavity 1211 from flowing upwards; the hollow 1211 can store water flowing into the upper right-oblique channel 1212, and the water flowing into the channel 1212 comes from the water inlet 1213; the output pressing block 129 transmits displacement to the extrusion cylinder 1214, the introduction holes 1217 distributed on the extrusion cylinder 1214 introduce water flow from the hollow cavity 1211 into the throttling cavity 1220, in the throttling cavity, the extrusion cylinder 1214 transmits displacement to the pushing ring 1218, the pushing ring 1218 extrudes the elastic deformation sheet 1219 to cause deformation, the conical structure at the end of the elastic deformation sheet 1219 gradually blocks the extraction hole 1222 of the fixed cylinder 1221 to reduce the aperture and realize adjustment of water flow and pressure (shown in fig. 5); the outlet hole 1222 can lead the water in the throttle chamber 1220 to the manifold 1223, and the position of the fixed cylinder 1221 is constant in the whole working process; below fixed cylinder 1221 is manifold 1223, and its inclined surface has a function of collecting and guiding water, and collects water flowing out from outlet hole 1222 to water outlet hole 1224. The upper and lower posts 1215, 1216 of the barrel 1214 perform the centering function of the output mass 129 and the resilient tabs 1219, respectively, with a 5 μm tolerance for coaxiality of the upper and lower posts 1215, 1216.
When the method is used, the specific operation steps are performed as follows:
step S1, preparation
S11, mounting the Y-direction displacement sensor 1 and the X-direction displacement sensor 2: in the circumferential direction, the Y-direction displacement sensor 1 is mounted at a 90 ° position of the stern shaft 21 (i.e., the Y-direction in fig. 2) through the Y-direction sensor fixing base 15, and the X-direction displacement sensor 2 is mounted at a 0 ° position of the stern shaft 21 (i.e., the X-direction in fig. 2) through the X-direction sensor fixing base 16; in the radial direction, considering that the ranges of the Y-direction displacement sensor 1 and the X-direction displacement sensor 2 are both 0-2 mm, the radial distance delta Y (shown in figure 6 a) between the Y-direction displacement sensor 1 and the inner wall of the water separator 10 is 1mm, the radial distance delta X between the X-direction displacement sensor 2 and the inner wall of the water separator 10 is also 1mm, and the Y-direction displacement sensor 1 and the X-direction displacement sensor 2 are precisely installed according to the positions; measuring the inner bore radius R of the water separator 10bAnd the radius R of the stern shaft 21sThereby defining the water separator 10 and the stern shaft 21Radius clearance c ═ R betweenb-Rs＝0.3mm；
S12, assembling the nesting mechanism 12 in the water separator 10, rotating the tightening screw block 122, and applying a pretightening force to the piezoelectric ceramic 124, so that the ceramic plate can be protected from being pulled, the extension displacement of the ceramic plate can be increased, the elastic deformation sheet 1219 can be bent to a certain extent, and the position of the end face conical structure of the elastic deformation sheet 1219 is preferably not to block the lead-out hole 1222;
s13, after all components are assembled, the starting motor 23 drives the screw shaft 21 to rotate, the trial operation of the water-lubricated bearing system is started, the normal working stage is started after the running-in stage is passed for a period of time, and the distance Y between the Y-direction displacement sensor 1 and the surface of the screw shaft 21 is measured1And the radial clearance c of the water separator 10 and the radial distance delta Y between the Y-direction displacement sensor 1 and the inner wall of the water separator 10 are combined, the axis coordinate Y 'of the stern shaft 21 (shown in figure 6) can be obtained according to the formula (1), and the axis coordinate x' of the stern shaft 21 can be solved according to the steps and the formula (2); in addition, simultaneously, a torque tachometer 3 is used for recording the friction torque M of the water-lubricated rubber bearing, a load sensor 4 is used for measuring the radial load W of the water-lubricated rubber bearing, and the friction coefficient f is calculated according to a formula (3); the above operation can obtain the axis coordinates (x ', y') of the stern shaft 21 and the variation range of the bearing friction coefficient f under the normal working condition, as shown in fig. 7, the maximum value x of the axis coordinates x under the normal working conditionmax0.57, minimum value xminMaximum value y of axial center y coordinate being-0.32max0.43, minimum value ymin-0.39 and the maximum value of the coefficient of friction f is fmax0.12, minimum value fmin＝0.09。
y′＝Δy+c-y1 (1)
x′＝Δx+c-x1 (2)
f＝2M/(WD) (3)
In the formula, (X ', Y') is the axis coordinate of the stern shaft, Δ Y is the radial distance between the Y-direction displacement sensor 1 and the inner wall of the water separator 10, and Δ X is the radial distance between the X-direction displacement sensor 2 and the inner wall of the water separator 10C is the radial clearance of the water separator 10, y1Is the distance, x, between the Y-direction displacement sensor 1 and the outer wall of the stern shaft 211The distance between the X-direction displacement sensor 2 and the outer wall of the stern shaft 21 is shown, f is a friction coefficient, M is a friction torque, D is the inner diameter of the water lubrication rubber bearing, and W is a radial load.
Step S2, realizing active control function of system
S21, in the actual work of a stern shaft system, real-time measuring and recording the axis coordinates (X ', Y') of the stern shaft through the X-direction displacement sensor 2 and the Y-direction displacement sensor 1, real-time measuring and recording the friction coefficient f of the water lubrication rubber bearing through the torque tachometer 3 and the load sensor 4, and judging whether the three parameters are always within the allowable change range of the normal working condition (shown in figure 8);
s22, if all three parameters (f, x ', y ') are within the normal range, such as f is 0.10, x ' is 0.13, y ' is-0.33, i.e. 0.09 ≦ f is 0.10 ≦ 0.12, -0.32 ≦ x ' is 0.13 ≦ 0.57, -0.39 ≦ y ≦ 0.33 ≦ 0.43, the active control system only activates the sensing unit and the determining unit, and the execution unit does not need to be activated (fig. 9);
s23, but if the friction coefficient f of the three parameters exceeds the normal range in the period of three consecutive turns of the stern shaft 21 (the friction coefficient is large and can be considered as the friction pair is in direct contact only after a period of time), for example, the friction coefficient f suddenly rises to 0.27 in actual operation, i.e. f is 0.27 > fmaxWhen the shaft center coordinate of the stern shaft measured by the sensing unit is in which quadrant the friction part is positioned, the execution unit is started: taking the calculated axis coordinate x ═ 0.44, y ═ 0.41 as an example, as shown in fig. 10, it is found that the friction position is in quadrant III, at this time, the execution unit is started, the driving voltage of the piezoelectric ceramic 124 in the nesting mechanism 12 on the left side and the lower side of the water separator 10 is increased, the piezoelectric ceramic 124 extends and pushes the output pressing block 129 to move, and then the extruding cylinder 1214 is pushed to move, and the extruding ring 1218 of the extruding cylinder 1214 further pushes the elastic deformation sheet 1219 to bend, so that the aperture of the outlet hole of the throttling cavity can be reduced, thereby reducing the water yield and increasing the component yieldThe pressure of the water outlets 1224 on the left and lower sides of the water vessel 10, thereby applying a resultant force obliquely upward to the right to the stern shaft 21 to urge the stern shaft to move obliquely upward to the right (as shown in fig. 10) and gradually leave the frictional contact portion;
s24, continuously measuring in real time by the Y-direction displacement sensor 1, the X-direction displacement sensor 2 and the torque tachometer 3, if the friction coefficient f of the stern shaft 21 and the water-lubricated rubber bearing 22 is judged to be still beyond the normal range and the friction part is still in the III quadrant, continuously increasing the voltage at two ends of the piezoelectric ceramic 124 and reducing the throttling aperture according to the step S23, and finally completely separating the friction part of the stern shaft 21 and the water-lubricated rubber bearing 22, so that the time and the process of the friction between the water-lubricated rubber bearing and the stern shaft are actively and rapidly shortened, and the friction and the abrasion of the water-lubricated rubber bearing are reduced;
s25, if the friction part in the steps S23-S24 is in the I-th quadrant, the driving voltage of the piezoelectric ceramics of the nesting mechanism 12 on the right side and the upper side of the water separator 10 needs to be increased; if the friction part is in the II th quadrant, the driving voltage of the piezoelectric ceramics of the left side and the upper side nesting mechanism 12 needs to be increased; if the rubbing position is in quadrant IV, the driving voltage of the piezoelectric ceramics of the right and lower nesting means 12 needs to be increased.
In order to solve the problem that the water-lubricated rubber bearing system is impacted by external load to cause direct contact friction between a stern shaft and a water-lubricated rubber bearing, the water-lubricated bearing system with the active control separation function is designed in the embodiment, the system judges whether the lubrication state between the stern shaft and the bearing is normal or not through real-time monitoring of the axis coordinate of the stern shaft and the friction coefficient of the bearing, and rapidly responds under the abnormal condition to adjust the flow and the pressure of four water outlets of a water separator, so that controllable acting force is applied to the stern shaft, the friction part of the stern shaft and the bearing is rapidly separated, and the friction and the abrasion of the bearing are reduced. The water-lubricated bearing system with the active control separation function, which is designed by the invention, has very high practical significance for reducing the abrasion of the water-lubricated rubber bearing and prolonging the service life of the bearing, and has better popularization and application values for an intelligent water-lubricated bearing system.

Claims (10)

1. The utility model provides a water lubricated bearing system with active control separation function, its characterized in that, the major structure includes stern axle system and installs the active control system on stern axle system, active control system includes the execution unit, the execution unit includes the water knockout drum, the water knockout drum is located one side of water lubricated bearing, the inner wall of water knockout drum sets up 4 delivery ports, every delivery port corresponds 1 nested mechanism, every nested mechanism can control the discharge and the pressure of corresponding delivery port, exert direction and controllable liquid water film power of size to the stern axle, utilize the liquid water film power between water knockout drum and the stern axle to promote the stern axle and make it break away from the frictional contact position.
2. The water-lubricated bearing system with the active separation control function according to claim 1, wherein the active control system further comprises a sensing unit and a judging unit, the sensing unit is used for measuring the displacement of the shaft center of the stern shaft, the friction torque of the water-lubricated bearing and the load borne by the water-lubricated bearing; the judging unit is used for acquiring physical quantities measured by the sensing unit, calculating to obtain the axle center coordinate of the stern shaft and the friction coefficient of the water-lubricated bearing, judging whether the bearing is in a normal working state or not, and the industrial personal computer outputs an execution signal to the nesting mechanism of the water segregator according to the state of the bearing.
3. The water-lubricated bearing system with the active separation control function according to claim 2, wherein the sensing unit comprises a Y-direction displacement sensor, an X-direction displacement sensor, a torque tachometer and a load sensor, and the Y-direction displacement sensor and the X-direction displacement sensor are used for sensing the Y-direction distance and the X-direction distance between the two sensors and a stern shaft in real time; the torque tachometer is used for sensing the friction torque of the water lubrication bearing in the running process in real time; the load sensor is used for measuring the load borne by the water lubrication bearing system in real time; the judging unit comprises a data acquisition card and an industrial personal computer, the data acquisition card is connected with the sensing unit through a signal line, and the data acquisition card transmits the physical quantity measured by the sensing unit to the industrial personal computer through the signal line; the industrial personal computer can judge whether the bearing is in a normal working state according to the displacement signal, the friction torque signal and the load signal which are collected in real time, and outputs an execution signal to the nesting mechanism of the water separator according to the state of the bearing.
4. The water lubricated bearing system with active separation control function of claim 1, wherein the actuator unit further comprises a hydraulic circuit for supplying water to the water separator; the hydraulic circuit includes a water tank, a filter, a hydraulic pump, and an overflow valve. The water tank, the filter, the hydraulic pump and the water separator are sequentially connected through pipelines; the hydraulic pump pumps water out of the water tank, and the filter filters the water flowing out of the water tank and conveys the water to the water separator.
5. The water-lubricated bearing system with the active separation control function according to claim 1, wherein the water separator is provided with nesting holes at every 90 ° in the circumferential direction, a nesting mechanism is arranged in each nesting hole, and a water outlet is arranged at the bottom of each nesting hole; and a water inlet is arranged beside each nesting hole and is communicated with the nesting holes through a flow passage.
6. The water-lubricated bearing system with the active separation control function according to claim 1, wherein the main structure of the nesting mechanism comprises a tightening screw block, a homogenizing pressure plate, piezoelectric ceramics, an output pressure block, a squeezing barrel, an elastic deformation sheet and a fixing barrel; a homogenizing press plate, piezoelectric ceramics, an output press block and an extrusion cylinder are arranged below the tightening screw block in sequence; a hollow cavity is formed between the output pressing block and the extrusion cylinder; the hollow cavity is used for storing water flowing in from the water inlet; the fixed barrel is of a barrel-shaped structure with an upper opening, the extrusion barrel can slide in contact with the inner wall of the fixed barrel, a throttling cavity is formed between the extrusion barrel and the fixed barrel, and the extrusion barrel is circumferentially provided with an introduction hole and a pushing ring; the introduction hole allows water to enter the throttling cavity from the middle cavity; an elastic deformation sheet is arranged below the pushing ring; the position of the end part conical structure of the elastic deformation sheet is preferably not blocked by the leading-out hole; a manifold is arranged below the fixed cylinder, and the bottom of the fixed cylinder is provided with leading-out holes which can lead water in the throttling cavity out to the manifold; the manifold is communicated with the water outlet.
7. The water-lubricated bearing system having an active separation control function according to claim 6, wherein the container comprises an upper column and a lower column, the upper column and the lower column perform the centering function of the output compact and the elastically deformable sheet, respectively, and the upper column and the lower column have a coaxiality tolerance of 5 μm.
8. The water lubricated bearing system with active separation control function of claim 6, wherein the water separator works on the principle that: when the nesting mechanism is assembled, the tightening screw block is rotated to push the lower homogenizing press plate, so that pre-tightening force is applied to the piezoelectric ceramic; the homogenizing press plate can homogenize the extruding force of the tightening screw block, so that the damage of the ceramic wafer caused by uneven stress due to the direct application of the homogenizing press plate to the piezoelectric ceramic is avoided; when the water separator works, the flange plate on the outer wall of the water separator prevents external water from entering the nesting hole; the hollow cavity stores water flowing in from the water inlet; the piezoelectric ceramic adopts a stack type piezoelectric ceramic piece, and the driving voltage of the piezoelectric ceramic is controlled by utilizing the characteristic that the piezoelectric ceramic is driven by voltages with different amplitudes and has different elongation amounts so as to output expected micro displacement; the output pressing block uniformly outputs the displacement of the piezoelectric ceramic to the extrusion cylinder, water flow enters the throttling cavity from the hollow cavity through the introduction holes distributed on the extrusion cylinder, the extrusion cylinder transmits the displacement to the pushing ring in the throttling cavity, the pushing ring extrudes the elastic deformation sheet to cause the elastic deformation sheet to deform, the conical structure at the end part of the elastic deformation sheet gradually plugs the leading-out hole of the fixed cylinder, the aperture is reduced, and the water flow is adjusted; the water in the throttling cavity is led out to the collecting cavity through the leading-out hole, and the position of the fixed cylinder is always unchanged in the whole working process; the lower part of the fixed cylinder is provided with a manifold, and the inclined plane of the fixed cylinder has the function of flow-collecting guide, so that water flowing out of the leading-out hole is collected to the water outlet hole.
9. The water lubricated bearing system with active separation control function of claim 2, wherein the Y-direction displacement sensor and the X-direction displacement sensor are planned on the basis of considering ranges of the Y-direction displacement sensor and the X-direction displacement sensorPrecisely installing a Y-direction displacement sensor and an X-direction displacement sensor according to the planning at the circumferential position of the displacement sensor on the left end surface of the water separator and the radial distances delta Y and delta X between the displacement sensor and the inner wall of the water separator; measuring the inner bore radius R of the water separatorbAnd radius of stern shaft RsSo as to determine the radius clearance c between the water segregator and the stern shaft as Rb-RsAnd the method is used for calculating the axis coordinates (x ', y') of the stern shaft.
10. A water lubricated bearing system having an active separation control function according to any one of claims 1 to 9, wherein the method of using the system comprises the steps of:
step 1, measuring the axis coordinates (x ', y') of a stern shaft and the variation range of the friction coefficient f of a water lubrication bearing through a sensing unit, and judging whether the three parameters are always within the allowable variation range of normal working conditions;
step 2, if the three parameters are in the normal variation range, the active control system only starts the sensing unit and the judging unit, and the execution unit does not need to be started;
step 3, if the friction coefficients in the three parameters exceed a normal range in the process of continuously rotating the stern shaft for three circles, indicating that serious friction exists between the stern shaft and the water-lubricated bearing, judging which quadrant the friction part is in by using a sensing unit and starting an execution unit, taking the third quadrant as an example of the friction part, improving the driving voltage of the piezoelectric ceramics in the left side and lower side nesting mechanism, extending the piezoelectric ceramics to push an output pressing block to move downwards and further push an extruding cylinder to move, and a pushing ring of the extruding cylinder further promotes an elastic deformation sheet to bend, so that the throttling aperture and the water yield are reduced, and the pressure of left side and lower side water outlets of the stern is improved, so that the resultant force of the right oblique upper side is applied to the stern shaft to promote the shaft to move to the right oblique upper side, and the stern gradually leaves the friction contact part;
step 4, after that, the sensing unit continuously measures in real time, if the friction part of the stern shaft and the bearing is still in the III-th quadrant through judgment, the voltage at two ends of the piezoelectric ceramic is continuously increased according to the step 3, the throttling aperture is reduced, and finally the friction part of the stern shaft and the bearing is completely separated, so that the time and the process of the friction of the bearing are actively shortened, and the friction and the abrasion of the water-lubricated bearing are reduced; in addition, when the piezoelectric ceramic is shortened, the elasticity of the elastic deformation sheet can drive the connecting part to restore to the initial position.
CN202111622650.6A 2021-12-28 2021-12-28 Water-lubricated bearing system with active control separation function and use method thereof Withdrawn CN114233758A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114810841A (en) * 2022-04-02 2022-07-29 陕西理工大学 Intelligent water lubricating bearing
CN115163666A (en) * 2022-05-09 2022-10-11 中国船舶重工集团公司第七一九研究所 Stern bearing for ship propulsion shafting, ship propulsion system and ship
CN117189791A (en) * 2023-11-07 2023-12-08 成都中科翼能科技有限公司 Power turbine bearing casing assembly with sensor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114810841A (en) * 2022-04-02 2022-07-29 陕西理工大学 Intelligent water lubricating bearing
CN114810841B (en) * 2022-04-02 2023-06-27 陕西理工大学 Intelligent water lubrication bearing
CN115163666A (en) * 2022-05-09 2022-10-11 中国船舶重工集团公司第七一九研究所 Stern bearing for ship propulsion shafting, ship propulsion system and ship
CN117189791A (en) * 2023-11-07 2023-12-08 成都中科翼能科技有限公司 Power turbine bearing casing assembly with sensor
CN117189791B (en) * 2023-11-07 2024-01-23 成都中科翼能科技有限公司 Power turbine bearing casing assembly with sensor

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Application publication date: 20220325