A water-lubricated bearing with self-repairing and self-cleaning functions and a detection method thereof

Abstract

The present invention discloses a water-lubricated bearing with self-repairing and self-cleaning functions and a detection method. The water-lubricated bearing comprises an alloy outer sleeve and a rubber inner sleeve. Self-repairing materials are dispersed in the rubber inner sleeve. The rubber inner sleeve is composed of a plurality of petal bodies. Each petal body can move in the radial direction. The gaps between adjacent petal bodies serve as water guide grooves. A detection hole is arranged on the alloy outer sleeve at a position directly opposite to the petal body. A pressure sensor is installed on the detection hole. When the pressure value fed back by the pressure sensor changes suddenly, the host of the pressure sensor outputs a signal that "the corresponding petal body and the shaft of the water-lubricated bearing have friction". The frequency of the signal occurring within the detection cycle is counted, and the corresponding part whose obtained frequency is greater than the critical value is calibrated as the vulnerable part of the rubber inner sleeve. The water-lubricated bearing provided by the present invention has self-repairing and self-cleaning functions, and solves the problem that the probe is easily damaged in the process of detecting the wear of the inner sleeve of the water-lubricated bearing.

Description

Technical Field

[0001] The invention belongs to the technical field of water-lubricated bearings, and in particular relates to a water-lubricated bearing with self-repairing and self-cleaning functions and a detection method. Background Art

[0002] Water-lubricated bearings have a certain degree of wear during use. Studies have shown that in clean water media, the wear of rubber bearings is relatively small, and the wear rate decreases with the increase of load and speed, and decreases with the increase of running time; in water lubrication media with a high impurity concentration of 0.15% sand content, the wear rate and friction coefficient of rubber bearings increase with the increase of load, and decrease with the increase of running time. It can be seen that the wear of water-lubricated bearings is greatly affected by the sand content in the water. Therefore, how to reduce the wear of water-lubricated bearings during use in turbid water is a problem that needs to be solved. The inner sleeve of a water-lubricated bearing is usually made of rubber material, which will affect the formation of a water film when it is worn or scratched. For this reason, a self-repairing water-lubricated rubber alloy material was developed in the early stage (see document CN113248803B for details), which can repair damage such as cracks or scratches on the surface of the inner sleeve. However, this solution cannot solve the damage problem of the inner sleeve of a water-lubricated bearing from the source. In addition, existing methods for detecting wear of the inner sleeve of water-lubricated bearings almost all involve inserting the front end of the probe into the inner sleeve and performing contact detection close to the shaft surface. The biggest disadvantage of this method is that it is easy to damage the sensor probe. The sensor probe also needs to be embedded in the inner sleeve, which damages the inner sleeve and is not convenient to operate.

[0003] At present, the inner sleeve of water-lubricated bearings is equipped with a water guide groove, which is used to discharge granular impurities such as sand between the inner sleeve and the shaft. In actual application, many granular impurities are difficult to be discharged smoothly from the water film, especially large particles (such as particles with a particle size of 0.5~2mm) are easy to get stuck between the inner sleeve and the shaft for a long time, and can hardly enter the water guide groove by themselves. Once a large particle is stuck between the inner sleeve and the shaft, it will cause serious damage to the surface of the inner sleeve. Therefore, how to clean the particles at the water film in a timely and smooth manner is also a problem that needs to be solved. Summary of the invention

[0004] At least in view of the problems mentioned in the background technology, one of the objectives of the present invention is to provide a water-lubricated bearing with self-repairing and self-cleaning functions.

[0005] The present invention adopts the following technical solution.

[0006] A water-lubricated bearing with self-repairing and self-cleaning functions comprises an alloy outer sleeve and a rubber inner sleeve, wherein the rubber inner sleeve is dispersed with self-repairing material, and the rubber inner sleeve is composed of a plurality of petal bodies, each of which can move in the radial direction, and the gaps between adjacent petal bodies serve as water guide grooves.

[0007] Furthermore, an elastic element is connected to the back side of each petal body, and radial movement of the petal body is achieved through the elastic element.

[0008] Furthermore, the alloy outer sleeve includes an inner ring and an outer ring, the inner ring and the outer ring are connected together by a rib plate, a chamber is provided between the inner ring and the outer ring, an axially arranged strip hole is provided on the inner ring, the elastic element passes through the strip hole, one end of the elastic element is fixedly connected to the petal body, and the other end is fixedly connected to the outer ring.

[0009] Furthermore, each petal body is connected to a plurality of elastic elements arranged at intervals, a partial area of ​​each elastic element is embedded in the petal body, and the elastic element is a cylindrical spring.

[0010] Furthermore, the cross section of each petal body is approximately trapezoidal, and the inner arc surfaces of all the petal bodies are located on the same circumference when the water-lubricated bearing is in normal operation.

[0011] Furthermore, the chamber is filled with a sponge body or a sponge ball, and the sponge body or the sponge ball is simultaneously coated on the elastic element located in the chamber.

[0012] As another preferred embodiment of the present invention, the rubber inner sleeve is replaced by polytetrafluoroethylene.

[0013] The second object of the present invention is to provide a method for detecting vulnerable parts of the rubber inner sleeve of the aforementioned water-lubricated bearing. A detection hole is provided on the alloy outer sleeve at a position directly opposite to the petal body, and a pressure sensor is installed on the detection hole. When the pressure value fed back by the pressure sensor changes suddenly, the host of the pressure sensor outputs a signal that "friction has occurred between the corresponding petal body and the shaft of the water-lubricated bearing"; the frequency of the occurrence of the signal within the detection period is counted, and the corresponding part whose obtained frequency is greater than the critical value is calibrated as the vulnerable part of the rubber inner sleeve. Preferably, the detection hole is directly opposite to the middle of the petal body, and the sudden change in pressure value means that the pressure suddenly increases and then suddenly decreases or remains constant.

[0014] Furthermore, the front end of the probe of the pressure sensor is located in the detection hole.

[0015] Beneficial effects: The water-lubricated bearing provided by the present invention has self-repair and self-cleaning functions. With the help of the water-lubricated bearing itself, granular impurities such as sand between the inner sleeve and the shaft can be discharged smoothly and quickly, which can effectively prevent large particles from being stuck between the inner sleeve and the shaft for a long time, and can effectively guide large particles into the water guide groove and be discharged, thereby avoiding damage to the inner sleeve of the water-lubricated bearing from the source as much as possible; the method for detecting vulnerable parts of the rubber inner sleeve of the water-lubricated bearing provided by the present invention is a non-destructive test, which does not require the probe to contact the shaft, fundamentally avoids the problem of friction and wear of the probe, and does not require the probe to be embedded in the rubber inner sleeve, thereby solving the problem of easy damage of the probe in the process of detecting wear of the inner sleeve of the water-lubricated bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional schematic diagram of a water-lubricated bearing in Example 1;

[0017] Figure 2 Schematic diagram of the cross section of the water-lubricated bearing in Example 1;

[0018] Figure 3 It is a three-dimensional schematic diagram of the water-lubricated bearing in Example 2;

[0019] Figure 4 Schematic diagram of the cross section of the water-lubricated bearing in Example 2;

[0020] Figure 5 It is a partial schematic diagram of the cross section of the water-lubricated bearing in Example 2 (detection state). DETAILED DESCRIPTION

[0021] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings. 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. Example 1

[0022] Combination Figure 1 to Figure 2 As shown, a water-lubricated bearing with self-repairing and self-cleaning functions includes an alloy outer sleeve 1 and a rubber inner sleeve 2, in which self-repairing materials are dispersed (self-repairing materials are prior art, and can adopt self-repairing water-lubricating rubber alloy materials developed in the early stage, or commercially available self-repairing rubber materials), and the rubber inner sleeve 2 is composed of a plurality of petal bodies 3, each of which can move in the radial direction, and the gaps between adjacent petal bodies 3 serve as water guide grooves 4.

[0023] In this embodiment, an elastic element 5 is connected to the back side of each petal body 3, and the radial movement of the petal body 3 is realized by the elastic element 5; a plurality of elastic elements 5 arranged at intervals are connected to each petal body 3, and a part of each elastic element 5 is embedded in the petal body 3, and the elastic element 5 is a cylindrical spring. The alloy outer sleeve 1 includes an inner ring 10 and an outer ring 11, and the inner ring 10 and the outer ring 11 are connected together through a rib plate 15, and a chamber 12 is provided between the inner ring 10 and the outer ring 11, and an axially arranged strip hole is provided on the inner ring 10, and the elastic element 5 passes through the strip hole, and one end of the elastic element 5 is fixedly connected to the petal body 3, and the other end is fixedly connected to the outer ring 11; the cross section of each petal body 3 is approximately trapezoidal, and the inner arc surfaces of all petal bodies 3 under the normal operation of the water-lubricated bearing are located on the same circumference.

[0024] When in use, the relative position of the shaft and the water-lubricated bearing is adjusted in advance, and a water film is formed between the inner arc surface of the petal body 3 and the shaft during operation. If the water-lubricated bearing is operated in water with a low content of particles, each petal body 3 will maintain its initial state. If the water-lubricated bearing is operated in water with a high content of particles, a part of the particles in the water (especially large particles) will enter between the inner arc surface of the petal body 3 and the shaft. Once the particles contact the inner arc surface of the petal body 3 and the shaft surface at the same time, the petal body 3 will be radially pressed and the elastic element 5 will be compressed. At this time, as the shaft continues to rotate, the particles will be driven laterally into the water guide groove 4. Once the particles enter the water guide groove 4, the petal body 3 can be reset with the help of the elastic force of the elastic element 5. Since the petal body 3 can move radially back and forth, in the process of radially pressing the petal body 3, the particles will roll into the water guide groove 4 under the rotation of the shaft (in the traditional scheme, once the particles enter between the inner arc surface of the petal body 3 and the shaft, they cannot roll. At this time, the particles are equivalent to blades and will continue to scratch the inner arc surface of the petal body 3), thereby achieving smooth and rapid discharge of granular impurities such as sand between the inner sleeve and the shaft, and also achieving self-cleaning of the inner arc surface of the petal body 3, reducing the wear of the inner arc surface of the petal body 3 by particles, and especially preventing the appearance of linear scratch grooves on the inner arc surface of the petal body 3. Example 2

[0025] Combination Figures 2 to 5 As shown, a water-lubricated bearing with self-repairing and self-cleaning functions includes an alloy outer sleeve 1 and a rubber inner sleeve 2, in which self-repairing materials are dispersed (self-repairing materials are prior art, and can adopt self-repairing water-lubricating rubber alloy materials developed in the early stage, or commercially available self-repairing rubber materials), and the rubber inner sleeve 2 is composed of a plurality of petal bodies 3, each of which can move in the radial direction, and the gaps between adjacent petal bodies 3 serve as water guide grooves 4. In this embodiment, an elastic element 5 is connected to the back side of each petal body 3, and the radial movement of the petal body 3 is achieved through the elastic element 5; each petal body 3 is connected to a plurality of elastic elements 5 arranged at intervals, and a partial area of ​​each elastic element 5 is embedded in the petal body 3, and the elastic element 5 adopts a cylindrical spring. The alloy sleeve 1 includes an inner ring 10 and an outer ring 11, and the inner ring 10 and the outer ring 11 are connected together by a rib plate 15. A chamber 12 is provided between the inner ring 10 and the outer ring 11. An axially arranged strip hole is provided on the inner ring 10, and an elastic element 5 passes through the strip hole. One end of the elastic element 5 is fixedly connected to the petal body 3, and the other end is fixedly connected to the outer ring 11; the cross-section of each petal body 3 is approximately trapezoidal, and the inner arc surfaces of all the petal bodies 3 under the normal operating state of the water-lubricated bearing are located on the same circumference.

[0026] In this embodiment, the chamber 12 is filled with a sponge 14 , and the sponge 14 is also wrapped around the elastic element 5 located in the chamber 12 .

[0027] In this embodiment, a detection hole 16 is provided on each alloy jacket 1 at a position directly opposite to the petal body 3, and a pressure sensor is installed on the detection hole 16. When the pressure value fed back by the pressure sensor changes suddenly, the host of the pressure sensor outputs a signal that "the corresponding petal body 3 and the shaft of the water-lubricated bearing have friction." Among them, the detection hole is directly opposite to the middle of the petal body 3, and the sudden change in pressure value means that the pressure suddenly increases first and then suddenly decreases or the position is at a larger value. The front end of the probe 6 of the pressure sensor is located in the detection hole, and the front section of the probe 6 is essentially a thin tube with an open front end, and the measured liquid can enter the inner cavity of the thin tube.

[0028] Compared with the first embodiment, the advantages of this embodiment include: the water-lubricated bearing can not only effectively eliminate the collision and impact potential energy of the shaft, but also facilitate accurate detection of the vulnerable parts of the water-lubricated bearing, and can self-clean particles attached to the side wall of the petal body 3. Figure 5 As shown, whenever a force (indicated by the arrow) from the inner side of the lobed body 3 acts on the lobed body 3, the lobed body 3 moves radially outward. At this time, there is a gap 17 between the side wall of the lobed body 3 and the side wall of the strip hole on the inner ring 10, and part of the water will enter the chamber 12 and wet the sponge 14 until the liquid on the sponge 14 in the chamber 12 is in a saturated state; in the subsequent use process, when the lobed body 3 maintains the initial state, the water pressure in the inner cavity of the probe 6 is consistent with the water pressure in the chamber 12, and the pressure value fed back by the pressure sensor in this process is a constant value; whenever a force (indicated by the arrow) from the inner side of the lobed body 3 acts on the lobed body 3, the lobed body 3 will squeeze the sponge 14, thereby removing part of the water in the sponge 14. It quickly squeezes into the inner cavity 7 of the probe 6, which causes the pressure value fed back by the pressure sensor to suddenly increase. At this time, it can be considered that the lobed body 3 is hit or that particles are stuck between the inner arc surface of the lobed body 3 and the shaft. Then, the host of the pressure sensor can output a signal that "the corresponding lobed body 3 and the shaft of the water-lubricated bearing have friction." When the particles leave / detach, the lobed body 3 is reset, and the pressure value fed back by the pressure sensor will be reset or changed to other constant values. If a certain detection part continuously or frequently experiences a sudden change in the pressure value fed back by the pressure sensor, indicating that the inner arc surface of the lobed body 3 corresponding to the part frequently rubs, then it can be known that the inner arc surface of the lobed body 3 corresponding to the part is a vulnerable part. On the other hand, in the process of the lobed body 3 squeezing the sponge 14, the water stored in the sponge 14 will flow from the gap 17 to the side of the inner arc surface of the lobed body 3, thereby washing away the particles attached to the side wall of the lobed body 3, and realizing self-cleaning of the particles attached to the side wall of the lobed body 3.

[0029] Here, the present embodiment also provides a method for detecting vulnerable parts of the rubber inner sleeve of a water-lubricated bearing. A detection hole 16 is provided on the alloy outer sleeve 1 at a position directly opposite to the petal body 3. A pressure sensor is installed on the detection hole 16. When the pressure value fed back by the pressure sensor changes suddenly, the host of the pressure sensor outputs a signal that "friction has occurred between the corresponding petal body 3 and the shaft of the water-lubricated bearing". The frequency of occurrence of the signal within the detection period is counted, and the corresponding part where the obtained frequency is greater than the critical value is calibrated as the vulnerable part of the rubber inner sleeve. Among them, the detection hole 16 is directly opposite to the middle of the petal body 3, and the sudden change in pressure value means that the pressure suddenly increases and then suddenly decreases or remains constant. The front end of the probe 6 of the pressure sensor is located in the detection hole 16. Figure 5 For example, if particles are stuck in the inner arc surface of the lobed body 3 and the shaft surface, the rotating shaft will press the lobed body 3, and the lobed body 3 will squeeze the sponge 14 in the direction indicated by the arrow, and then the water pressure in the inner cavity 7 of the probe 6 will increase instantly. At this time, it means that the lobed body 3 is hit or particles are stuck, which can easily cause wear on the inner arc surface of the lobed body 3. When the lobed body 3 is reset, the water in the inner cavity of the probe 6 will be absorbed / flow back to the sponge 14. In addition, this method is also suitable for detecting whether large particles are stuck in the inner arc surface of the lobed body 3 and the shaft surface. Example 3

[0030] A water-lubricated bearing with self-repairing and self-cleaning functions, referring to Example 2, the difference between it and Example 2 is that the rubber inner sleeve 2 is replaced by polytetrafluoroethylene.

[0031] The water-lubricated bearing provided by the present invention has the functions of self-repair and self-cleaning. With the help of the water-lubricated bearing with a specific structure, the sand and other granular impurities between the inner sleeve and the shaft can be discharged smoothly and quickly, which can effectively prevent large particles from being stuck between the inner sleeve and the shaft for a long time, and can effectively guide the large particles into the water guide groove and be discharged, thereby avoiding damage to the inner sleeve of the water-lubricated bearing from the source as much as possible; the method for detecting vulnerable parts of the rubber inner sleeve of the water-lubricated bearing provided by the present invention belongs to non-destructive testing, does not require the probe to contact the shaft, fundamentally avoids the problem of friction and wear of the probe, and does not need to embed the probe into the rubber inner sleeve, thereby solving the problem of easy damage of the probe in the process of detecting wear of the inner sleeve of the water-lubricated bearing.

Claims

1. A method for detecting vulnerable parts of a rubber inner sleeve of a water-lubricated bearing, characterized in that: A detection hole (16) is provided on the alloy outer sleeve (1) at a position directly opposite to the petal body (3), and a pressure sensor is installed on the detection hole (16). When the pressure value fed back by the pressure sensor changes suddenly, the host of the pressure sensor outputs a signal that "friction has occurred between the corresponding petal body (3) and the shaft of the water-lubricated bearing". The frequency of occurrence of the signal within the detection cycle is counted, and the corresponding part whose obtained frequency is greater than a critical value is calibrated as a vulnerable part of the rubber inner sleeve; The water-lubricated bearing comprises an alloy outer sleeve (1) and a rubber inner sleeve (2), wherein a self-repairing material is dispersed in the rubber inner sleeve (2), and the rubber inner sleeve (2) is composed of a plurality of petal bodies (3), each of which is capable of moving in a radial direction, and the gaps between adjacent petal bodies (3) serve as water guide grooves (4); an elastic element (5) is connected to the back side of each petal body (3), and radial movement of the petal body (3) is achieved through the elastic element (5); the alloy outer sleeve (1) comprises an inner ring (10) and an outer ring (11), and the inner ring The inner ring (10) and the outer ring (11) are connected together through a rib plate (15); a chamber (12) is provided between the inner ring (10) and the outer ring (11); an axially arranged strip hole is provided on the inner ring (10); an elastic element (5) passes through the strip hole; one end of the elastic element (5) is fixedly connected to the petal body (3) and the other end is fixedly connected to the outer ring (11); a sponge (14) or a sponge ball is filled in the chamber (12); the sponge (14) or the sponge ball is simultaneously covered on the elastic element (5) located in the chamber (12).

2. The detection method according to claim 1, characterized in that: A plurality of elastic elements (5) arranged at intervals are connected to each petal body (3); a partial area of ​​each elastic element (5) is embedded in the petal body (3); and the elastic element (5) is a cylindrical spring.

3. The detection method according to claim 2, characterized in that: The cross section of each petal body (3) is approximately trapezoidal, and the inner arc surfaces of all the petal bodies (3) are located on the same circumference when the water-lubricated bearing is in normal operation.

4. The detection method according to any one of claims 1 to 3, characterized in that: The rubber inner sleeve (2) is replaced by polytetrafluoroethylene.

5. The detection method according to claim 4, characterized in that: The detection hole (16) is directly opposite to the middle of the petal body (3), and the sudden change in pressure value means that the pressure suddenly increases and then suddenly decreases or remains at a constant value.

6. The detection method according to claim 5, characterized in that: The front end of the probe (6) of the pressure sensor is located in the detection hole (16).

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