Low-resistance carrier roller with self-powered fault detection function

Abstract

The invention discloses a low-resistance carrier roller with a self-powered fault detection function. The low-resistance carrier roller comprises a roller body and a bearing seat arranged in the roller body. The bearing is arranged in an inner cavity of the bearing seat; the rotating shaft is arranged in the bearing in a penetrating manner; the magnetic pole power generation sealing assembly and the magnetic liquid sealing assembly are arranged in an inner cavity of the bearing seat and arranged on the rotating shaft in the axial direction; the fault detection sensor, the magnetic pole power generation sealing assembly and the magnetic liquid sealing assembly are arranged in an inner cavity of the bearing seat and form sealing on the inner side and the outer side of the bearing respectively; the magnetic power generation sealing assembly comprises a magnetic pole sleeve group, a coil and magnetic liquid, the inner circumference of the coil sleeves the rotating shaft, the coil is electrically connected with the fault detection sensor through a wire, the magnetic pole sleeve group is pressed in an inner cavity of the bearing seat and coaxially surrounds the outer side of the coil, and a gap is formed between the inner circumference of the magnetic pole sleeve group and the outer circumference of the coil; the magnetic liquid is filled in the gap to form sealing. The coil and the rotating shaft rotate synchronously and cut magnetic induction lines to generate an electric field and supply power to the fault detection sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of idlers, and specifically to the safety monitoring technology of idlers. Background Art

[0002] In underground coal mine operations, as a key transportation equipment, the normal operation of the idlers of belt conveyors directly affects the efficiency and safety of the entire conveying system. The underground coal mine environment is harsh, and dust and moisture are likely to invade the interior of the idlers, resulting in problems such as bearing jamming and roller wear. If not detected in time, it may even lead to serious production accidents and pose a threat to the safety of miners. However, most current idler designs do not have internal monitoring sensors.

[0003] In view of this, it is particularly crucial to design an internal monitoring sensor for idlers to ensure the stability of idler operation. By real-time monitoring the operating status of idlers, potential faults can be detected and prevented in a timely manner, reducing the unplanned downtime of equipment and thus improving production efficiency.

[0004] However, traditional monitoring sensors usually rely on external power supply, which is extremely difficult to implement in the underground coal mine environment; moreover, the power supply in underground coal mines is complex and unstable, with high wiring and maintenance costs, and there are also safety hazards.

[0005] Therefore, how to stably and reliably supply power to the internal monitoring sensors of idlers is an urgent problem to be solved in this field. Summary of the Invention

[0006] Aiming at the above technical problems existing in the existing idlers, the purpose of the present invention is to provide a low-resistance idler with a self-powered fault detection function, which forms a self-powered structure inside the low-resistance idler to supply power to the internal monitoring sensors of the idler, abandoning the power supply scheme from the outside of the idler, thereby effectively solving the problems existing in the prior art.

[0007] To achieve the above purpose, the low-resistance idler with a self-powered fault detection function provided by the present invention includes a roller body, a bearing seat fixedly arranged inside the roller body, a bearing arranged inside the bearing seat, and a rotating shaft passing through the bearing; characterized in that it further includes a magnetic pole power generation sealing component and a fault detection sensor located in the inner cavity of the bearing seat;

[0008] The fault detection sensors are distributed on the inner side of the bearing and are arranged on the inner ring of the bearing, and can rotate synchronously with the rotating shaft inside the bearing;

[0009] The magnetic power generation sealing component is distributed on the inner side of the bearing, and includes a magnetic pole sleeve group, a coil, and a first magnetic fluid. The magnetic pole sleeve group is press-fitted in the inner cavity of the bearing seat and coaxially surrounds the outside of the rotating shaft, forming a first magnetic circuit;

[0010] The coil corresponding to the magnetic pole sleeve set is sleeved on the rotating shaft and electrically connected to the fault detection sensor. The coil can rotate synchronously with the rotating shaft and can cut the first magnetic circuit generated by the magnetic pole sleeve set during rotation to generate an electric field inside the coil and supply power to the fault detection sensor when transmitted thereto.

[0011] The first magnetic fluid is filled between the magnetic pole sleeve set and the coil and forms a sealing structure between the bearing seat and the inner cavity of the roller under the restraint of the first magnetic circuit generated by the magnetic pole sleeve set.

[0012] Further, the magnetic pole sleeve set includes at least a pair of magnetic poles, and at least a pair of magnetic poles are symmetrically distributed relative to the rotating shaft.

[0013] Further, the magnetic pole sleeve set includes more than two pairs of magnetic poles. Each pair of magnetic poles is symmetrically distributed relative to the rotating shaft, and the adjacent magnetic poles along the circumferential direction of the rotating shaft are distributed differently in sequence.

[0014] Further, the magnetic pole sleeve set further includes a filler, and the filler is filled between adjacent magnetic poles.

[0015] Further, an insulating structure is formed between the rotating shaft and the coil.

[0016] Further, the low-resistance idler further includes a magnetic fluid sealing assembly, and the magnetic fluid sealing assembly is distributed outside the bearing and can form a liquid sealing structure with the rotating shaft.

[0017] Further, the magnetic fluid sealing assembly includes a first pole shoe, a permanent magnet, a second pole shoe, and a second magnetic fluid. The first pole shoe and the second pole shoe are located in the inner cavity of the bearing seat, are axially distributed along the rotating shaft, and are coaxially distributed with the rotating shaft. The permanent magnet is arranged between the first pole shoe and the second pole shoe and forms a second magnetic circuit between the first pole shoe and the second pole shoe. The second magnetic fluid is filled between the first pole shoe, the second pole shoe and the rotating shaft and forms a liquid sealing structure between the magnetic fluid sealing assembly and the rotating shaft under the restraint of the second magnetic circuit.

[0018] Further, the low-resistance idler further includes a non-magnetic dust cover, and the dust cover is fixed on the rotating shaft and is located outside the magnetic fluid sealing assembly.

[0019] Further, the magnetic power generation sealing assembly further includes a commutator, and the commutator is connected to the output end of the coil.

[0020] Further, the fault detection sensor is one or more of a temperature sensor, a dust sensor, and a vibration sensor.

[0021] The low-resistance idler solution with self-powered fault detection function provided by the present invention can monitor the operating state of the idler in real time by integrating a self-powered monitoring sensor in the idler, and can promptly detect problems such as bearing jamming and wear caused by the intrusion of dust and moisture, thereby effectively preventing major accidents.

[0022] The low-resistance idler solution with self-powered fault detection function provided by the present invention specifically forms a self-powered structure in the idler through an innovative electromagnetic induction structure, directly self-powers the built-in monitoring sensor in the idler, and abandons the solution of power supply from outside the idler. This not only ensures the stable reliability of the power supply for the built-in monitoring sensor in the idler, but also can significantly improve the reliability and service life of the idler.

[0023] On this basis, the solution of the present invention further adopts a magnetic fluid sealing method, which can greatly improve the reliability of the seal, and at the same time greatly reduce the rotation resistance of the idler, thereby reducing the transportation energy consumption of the belt conveyor. Brief Description of the Drawings

[0024] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0025] Figure 1 is a cross-sectional view of the low-resistance idler with self-powered fault detection function provided by the present invention;

[0026] Figure 2 is Figure 1 a schematic diagram in the A-A direction in

[0027] Figure 3 is a schematic diagram of the low-resistance idler with self-powered fault detection function provided by the present invention when two groups of first magnetic poles and two second magnetic poles are adopted;

[0028] Figure 4 is a schematic diagram of the low-resistance idler with self-powered fault detection function provided by the present invention when three groups of first magnetic poles and three second magnetic poles are adopted;

[0029] Illustration:

[0030] Roller body 100, bearing seat 200, bearing 300, rotating shaft 400, magnetic pole power generation and sealing assembly 500, fault detection sensor 600, magnetic fluid sealing assembly 700, first sleeve 800, second sleeve 900;

[0031] Circular snap ring 310, magnetic pole sleeve group 510, first magnetic pole 511, second magnetic pole 512, filler 513, coil 520, first magnetic fluid 530, coil wire 540, first pole shoe 710, permanent magnet 720, second pole shoe 730, second magnetic fluid 740, annular protrusion 750, annular groove 760. Detailed Embodiments

[0032] In order to make the technical means, creative features, achieved purposes and effects realized by the present invention easy to understand, the present invention will be further described below with reference to specific illustrations.

[0033] In view of the problems faced by the existing low-resistance idler fault monitoring technology, the present invention provides a low-resistance idler solution with a self-powered fault detection function. By installing corresponding fault detection sensors inside the low-resistance idler and constructing a self-powered structure based on electromagnetic induction inside the low-resistance idler, this self-powered structure can form a linkage with the rotating shaft inside the low-resistance idler, synchronously form electromagnetic induction when the low-resistance idler rotates, and form an electric field inside to automatically power the fault detection sensors, thereby realizing the abandonment of the power supply scheme from the outside of the idler and ensuring the stable reliability of the power supply for the monitoring sensors built in the idler.

[0034] See Figure 1 , which shows a schematic structural diagram of a low-resistance idler with a self-powered fault detection function provided by the present invention.

[0035] Based on the illustration, the low-resistance idler with a self-powered fault detection function specifically includes seven components: a roller body 100, a bearing seat 200, a bearing 300, a rotating shaft 400, a magnetic pole power generation sealing assembly 500, a fault detection sensor 600, and a magnetic fluid sealing assembly 700.

[0036] The roller body 100 in this low-resistance idler is the structural main body for carrying other components. The specific composition of the roller body 100 is not limited here and can be determined according to actual needs.

[0037] The bearing seat 200 is fixedly arranged inside the roller body 100 for accommodating the bearing 300, the magnetic pole power generation sealing assembly 500, and the magnetic fluid sealing assembly 700.

[0038] On this basis, to ensure the stability of the entire structure, the bearing seat 200 is preferably welded inside the roller body 100. It can be understood that the bearing seat 200 can also adopt other fixed setting structures according to needs.

[0039] The bearing 300 in this low-resistance idler is arranged in the inner cavity of the bearing seat 200 for supporting and connecting the rotating shaft 400. The specific composition of the bearing 300 is not limited here and can be determined according to actual needs.

[0040] The rotating shaft 400 in this low-resistance idler is inserted into the bearing 300. The specific composition of the rotating shaft 400 is not limited here and can be determined according to actual needs.

[0041] Thus, the basic structure of this low-resistance idler is formed, enabling the roller body 100 and the rotating shaft 400 to achieve relative rotation through the bearing 300.

[0042] On this basis, the fault detection sensors 600 in this low-resistance idler are distributed in the inner cavity of the bearing housing 300 for real-time monitoring of the operating state of the idler.

[0043] Specifically, the fault detection sensors 600 are distributed on the inner side of the bearing 300, are arranged on the inner ring of the bearing 300, and can rotate synchronously with the rotating shaft 400 in the bearing 300, that is, there is no relative movement between the sensors and the rotating shaft 400. In this way, there is no need to set up a slip ring structure, thus improving the stability of the detection structure and detection performance.

[0044] Correspondingly, the magnetic pole power generation sealing assembly 500 in this low-resistance idler is entirely located in the inner cavity of the bearing housing 200 and is distributed on the inner side of the bearing 300, used to form an automatic power supply structure based on magnetic induction in the bearing housing 200 to automatically supply power to the fault detection sensors 600; at the same time, it also forms a sealing structure between the bearing housing 200 and the inner cavity of the roller body 100 to improve the stability and reliability of the overall structure.

[0045] Further combined with Figure 1 As shown, the magnetic pole power generation sealing assembly 500 in this low-resistance idler is mainly composed of a magnetic pole sleeve group 510, a coil 520, and a first magnetic fluid 530 in cooperation.

[0046] Among them, the magnetic pole sleeve group 510 is integrally press-fitted into the inner cavity of the bearing housing 200 and coaxially surrounds the outside of the rotating shaft 400, and forms a first magnetic circuit.

[0047] At the same time, the coil 520 corresponds to the magnetic pole sleeve group 510 and is sleeved on the rotating shaft 400, that is, the axial position of the coil 520 is the same as the axial position of the magnetic pole sleeve group 510, so that the coil 520 is located in the first magnetic circuit generated by the magnetic pole sleeve group 510. At the same time, there is no relative movement between the coil 520 and the rotating shaft 400, and it can rotate synchronously with the rotating shaft 400. In this way, the coil 520 can rotate synchronously with the rotating shaft 400 together with the fault detection sensors 600 arranged on the inner ring of the bearing 300. The output end of the coil 520 can be directly electrically connected to the fault detection sensors 600 arranged on the inner ring of the bearing 300. In this way, the slip ring structure is eliminated, and the stability of the detection structure and detection performance can be effectively improved.

[0048] The coil 520 arranged in this way can rotate synchronously with the rotating shaft 400 when the rotating shaft 400 rotates, and the coil 520 can cut the first magnetic circuit generated by the magnetic pole sleeve group 510 during the rotation process to generate an electric field inside the coil 520 and supply power to the fault detection sensors 600 through the coil wire 540.

[0049] Furthermore, when the coil 520 corresponds to the magnetic pole sleeve set 510 and is sleeved on the rotating shaft 400, a gap can be formed between the outer periphery of the coil 520 and the inner periphery of the magnetic pole sleeve set 510, and the first magnetic fluid 530 is filled in this gap. The first magnetic fluid 530 can form a liquid sealing structure between the bearing housing 200 and the inner cavity of the roller body 100 under the restraint of the first magnetic circuit generated by the magnetic pole sleeve set 510, which can prevent the lubricating oil from leaking into the bearing housing 200 and the inner part of the roller body 100 during the operation of the bearing, and ensure the stable and reliable operation of the overall structure.

[0050] The magnetic fluid sealing assembly 700 in this low-resistance idler is integrally arranged in the inner cavity of the bearing housing 200 and axially distributed outside the bearing 300 along the rotating shaft 400. The magnetic fluid sealing assembly 700 is coaxially distributed with the rotating shaft 400 and can form a liquid sealing structure between the outside of the bearing 300 and the rotating shaft 400, which can prevent foreign objects (such as dust) in the external environment from entering the bearing 300 and ensure the stable and reliable operation of the overall structure.

[0051] In this low-resistance idler, the magnetic fluid sealing assembly 700 and the magnetic pole power generation sealing assembly 500 can cooperate to form liquid sealing structures on the inner and outer sides of the bearing 300 respectively, effectively ensuring the stable and reliable operation of the overall structure.

[0052] For the low-resistance idler solution with self-powered fault detection function given in the present invention, the following further gives its specific implementation scheme.

[0053] Combined with Figure 1 As shown, when the bearing 300 in this low-resistance idler is installed inside the bearing housing 200, in order to limit the axial movement of the bearing 300, a retaining ring 310 is preferably provided outside the bearing 300. Specifically, the retaining ring 310 is sleeved on the rotating shaft 400 and located outside the bearing 300, forming an abutment with the outer section of the bearing 300, thereby effectively limiting the axial movement of the bearing 300.

[0054] When the magnetic pole sleeve set 510 in this low-resistance idler is specifically implemented, it is composed of at least a pair of magnetic poles, and this at least a pair of magnetic poles are symmetrically distributed relative to the rotating shaft 400, thereby forming the first magnetic circuit.

[0055] Refer to Figure 2 which shows an example scheme of using a pair of magnetic poles to form the magnetic pole sleeve set 510.

[0056] Based on the illustration, this pole set 510 is composed of a first magnetic pole 511 and a second magnetic pole 512 in cooperation. Among them, the first magnetic pole 511 and the second magnetic pole 512 are different. That is, the first magnetic pole 511 is the N(S) pole, and the second magnetic pole 512 is the S(N) pole. They are symmetrically distributed relative to the rotating shaft 400, thus forming a first magnetic circuit between them. At the same time, the inner circumferences of the first magnetic pole 511 and the second magnetic pole 512 can respectively cooperate with the outer circumference of the coil 520 sleeved on the rotating shaft 400 to define a gap for filling the first magnetic liquid 530; the filled first magnetic liquid 530 can be confined in the corresponding gap under the action of the first magnetic circuit to form a liquid seal structure.

[0057] See Figure 3 , which shows an example scheme of using two pairs of magnetic poles to form the pole set 510.

[0058] Based on the illustration, this pole set 510 is specifically composed of two groups of first magnetic poles 511 and two groups of second magnetic poles 512 in cooperation. Among them, the first magnetic pole 511 and the second magnetic pole 512 are different. That is, the first magnetic pole 511 is the N(S) pole, and the second magnetic pole 512 is the S(N) pole. The two groups of first magnetic poles 511 and the two groups of second magnetic poles 512 are divided into two teams, and each team of magnetic poles is symmetrically distributed relative to the rotating shaft 400, so that two first magnetic circuits can be formed. At the same time, the inner circumferences of each group of first magnetic poles 511 and each group of second magnetic poles 512 can respectively cooperate with the outer circumference of the coil 520 sleeved on the rotating shaft 400 to define a gap for filling the first magnetic liquid 530; the filled first magnetic liquid 530 can be confined in the corresponding gap under the action of the first magnetic circuit to form a liquid seal structure.

[0059] See Figure 4 , which shows an example scheme of using three pairs of magnetic poles to form the pole set 510.

[0060] Based on the illustration, this pole set 510 is specifically composed of three groups of first magnetic poles 511 and three groups of second magnetic poles 512 in cooperation. Among them, the first magnetic pole 511 and the second magnetic pole 512 are different. That is, the first magnetic pole 511 is the N(S) pole, and the second magnetic pole 512 is the S(N) pole. The three groups of first magnetic poles 511 and the two groups of second magnetic poles 512 are divided into three teams, and each team of magnetic poles is symmetrically distributed relative to the rotating shaft 400, and the adjacent magnetic poles are alternately different along the circumferential direction of the rotating shaft 40, so that three first magnetic circuits can be formed. At the same time, the inner circumferences of each group of first magnetic poles 511 and each group of second magnetic poles 512 can respectively cooperate with the outer circumference of the coil 520 sleeved on the rotating shaft 400 to define a gap for filling the first magnetic liquid 530; the filled first magnetic liquid 530 can be confined in the corresponding gap under the action of the first magnetic circuit to form a liquid seal structure.

[0061] It can be understood that the configuration of the magnetic pole sleeve group 510 in the solution of the present invention is not limited to this, and other multi-magnetic pole distribution setting solutions can be further adopted according to needs.

[0062] Here, the specific configurations of the first magnetic pole 511 and the second magnetic pole 512 are not limited, and can be in a fan shape, a square shape or other shapes, for example.

[0063] During the operation of the idler roller, a large amount of heat is generated when the bearing 300 rotates, causing the lubricating oil in the bearing 300 to evaporate. In order to prevent the lubricating oil from leaking into the bearing housing 200 and the roller body 100, the solution of the present invention further adds a filler 513 in the magnetic pole sleeve group 510. The filler 513 is arranged between the adjacent first magnetic pole 511 and the second magnetic pole 512, and the filler 513 is in close contact with the first magnetic pole 511 and the second magnetic pole 512 respectively, thereby forming a sealing structure.

[0064] Here, taking Figure 2 the structure of the magnetic pole sleeve group 510 shown as an example to illustrate the sealing function of the magnetic pole sleeve group 510. The filler 513 arranged between the adjacent first magnetic pole 511 and the second magnetic pole 512 can form a sealing structure between the magnetic pole and the bearing 300 and the bearing housing 200. At the same time, the first magnetic fluid 530 filled in the gap between the magnetic pole sleeve group 510 and the coil 520 is bound between the magnetic pole sleeve group 510 and the coil 520 under the action of the first magnetic circuit formed by the magnetic pole sleeve group 510, forming a liquid sealing structure, which can effectively prevent the lubricating oil from leaking into the bearing housing 20 and the roller body 100.

[0065] When the magnetic pole sleeve group 510 with such a structure is installed in the bearing housing 200, the whole magnetic pole sleeve group 510 is pressed into the bearing housing 200 and axially and radially positioned by the bearing housing 200. Specifically, the inner side of the magnetic pole sleeve group 510 is axially abutted against the inner wall of the bearing housing 200, and the outer side of the magnetic pole sleeve group 510 is abutted against the bearing 300. The axial movement of the magnetic pole sleeve group 510 is limited by the cooperation of the bearing housing 200 and the bearing 300.

[0066] Furthermore, in order to prevent the magnetic field formed in the magnetic pole sleeve group 510 from leaking into the bearing 300 and affecting the operation of the bearing 300, the solution of the present invention adds a first sleeve 800 between the magnetic pole sleeve group 510 and the bearing 300. The whole first sleeve 800 is made of a non-magnetic conductive material, and the outer peripheral surface thereof is respectively fitted with the inner surface of the bearing housing 200, which can prevent the magnetic field formed in the magnetic pole sleeve group 510 from leaking into the bearing 300 and affecting the operation of the bearing 300.

[0067] Furthermore, in order to prevent the electric field generated in the coil 520 from leaking, the solution of the present invention forms an insulating structure between the rotating shaft 400 and the coil 520.

[0068] For example, the rotating shaft 400 can be made of an insulating material.

[0069] As an alternative, an insulating member can be provided between the coil 520 and the rotating shaft 400 to insulate and separate the coil 520 and the rotating shaft 400 through the insulating member.

[0070] Combined Figure 1 As shown, when the magnetic fluid sealing assembly 700 in this low-resistance idler is specifically implemented, it is mainly composed of a first pole shoe 710, a permanent magnet 720, a second pole shoe 730, and a second magnetic fluid 740 in cooperation.

[0071] Among them, the first pole shoe 710 and the second pole shoe 730 are located in the inner cavity of the bearing housing 200, and the first pole shoe 710 and the second pole shoe 730 are arranged in sequence along the axial direction of the rotating shaft 400 outside the bearing 300 and are coaxially distributed with the rotating shaft 400.

[0072] Furthermore, the first pole shoe 710 and the second pole shoe 730 are arranged at intervals along the axial direction of the rotating shaft 400, and a sealing gap is formed between the inner peripheral surfaces of the first pole shoe 710 and the second pole shoe 730 and the peripheral surface of the rotating shaft 400.

[0073] On this basis, the permanent magnet 720 is located in the inner cavity of the bearing housing 200 and is distributed between the first pole shoe 710 and the second pole shoe 730. The permanent magnet 720 is coaxially distributed with the support of the rotating shaft 400, and there is a gap between the inner peripheral surface of the permanent magnet 720 and the peripheral surface of the rotating shaft 400.

[0074] Among them, the first pole shoe 710 and the second pole shoe 730 are made of a magnetic conductive material, so that the permanent magnet 720 cooperates with the first pole shoe 710 and the second pole shoe 730 to form a second magnetic circuit.

[0075] On this basis, the second magnetic fluid 740 in the magnetic fluid sealing assembly 700 is filled in the sealing gap between the first pole shoe 710, the second pole shoe 730 and the rotating shaft 400. The second magnetic fluid 740 filled in the gap is bound between the magnetic fluid assembly 700 and the rotating shaft 400 under the action of the second magnetic circuit formed by the permanent magnet 720, so as to form a liquid sealing structure between the magnetic fluid assembly 700 and the rotating shaft 400.

[0076] As a further explanation, the permanent magnet 720 in the scheme of the present invention is configured to generate a non-uniform magnetic field, which can form a magnetic field gradient in the sealing gap between the pole shoe and the rotating shaft based on the non-uniform magnetic field, so that the particles in the magnetic liquid will gather towards the area with high magnetic field intensity (such as the top of the pole tooth) under the action of the gradient magnetic field, and then form a plurality of high-density "liquid O-rings", thereby significantly improving the sealing pressure and reliability, and avoiding the problem of uneven distribution of the magnetic liquid due to a uniform magnetic field, resulting in sealing failure.

[0077] To this end, the permanent magnet 720 in the solution of the present invention can be composed of cylindrical magnets of different sizes, thereby generating a non-uniform magnetic field.

[0078] As an alternative, the permanent magnet 720 may also be composed of cylindrical magnets made of different materials but of the same size, such as neodymium iron boron N32, N34, N35, etc., thereby generating a non-uniform magnetic field.

[0079] As an alternative, the permanent magnet 720 can also be composed of cylindrical magnets with the same material and size but different magnetization, thereby generating a non-uniform magnetic field, such as Figure 3 and Figure 4 shown.

[0080] As a further explanation, the solution of the present invention preferably has a plurality of annular protrusions 750 arranged at intervals along the axial direction of the rotating shaft 400 on the inner circumferential surfaces of the first pole shoe 710 and the second pole shoe 730, and a sealing gap is formed between the top surfaces of the annular protrusions 750 and the rotating shaft 400. On the first pole shoe 710 and the second pole shoe 730, an annular groove 760 is formed between two adjacent annular protrusions 750.

[0081] In this way, through the cooperation of the annular protrusion 750 and the annular groove 760, a magnetic field gradient will be formed in the sealing gap under the non-uniform magnetic field generated by the permanent magnet 720. At this time, the magnetic field intensity in the top area of ​​the annular pole tooth 750 is high. At this time, the magnetic liquid 900 in the sealing gap is gathered between the annular protrusion 750 and the rotating shaft 400 under the action of the magnetic field gradient, forming liquid "O-rings", thereby achieving a good sealing effect.

[0082] As a further explanation, the present invention adds a second sleeve 900 between the magnetic liquid sealing assembly 700 and the bearing 300. The second sleeve 900 is made entirely of non-magnetic material, and its outer peripheral surface can fit with the inner surface of the bearing seat 200, thereby preventing the magnetic field formed in the magnetic liquid sealing assembly 700 from leaking into the bearing 300 and affecting the operation of the bearing 300.

[0083] Furthermore, in order to prevent leakage of the magnetic field generated by the permanent magnet 720 , the magnetic fluid assembly 700 may be separated from the external environment by providing a dust cover.

[0084] Specifically, the dust cover here is made of non-magnetic material and is in interference connection with the rotating shaft 400. It is fixedly arranged on the rotating shaft 400, has no relative movement with the rotating shaft 400, can rotate synchronously with the rotating shaft 400, and has relative movement with the bearing seat 200.

[0085] The dust cover arranged in this way can not only prevent the magnetic field leakage generated by the permanent magnet 720, but also preliminarily prevent the dust in the external environment from entering the idler.

[0086] Combined with Figure 1 As shown, the fault detection sensor 600 in this low-resistance idler can be one or more of a temperature sensor, a dust sensor, and a vibration sensor, so as to accurately and real-time monitor the operating state of the idler.

[0087] As a further illustration, if the fault detection sensor 600 here adopts an AC-type sensor, it is fixed on the inner ring of the bearing 300 and can be directly electrically connected to the output end of the coil 520 fixedly sleeved on the rotating shaft 400 through the coil wire 540.

[0088] If the fault detection sensor 600 here adopts a DC-type sensor, it is fixed on the inner ring of the bearing 300, and a commutator is added at the output end of the coil 520 fixedly sleeved on the rotating shaft 400, and then the fault detection sensor 600 and the commutator are connected through the coil wire 540. The added commutator is used to convert the current generated by the coil 520 through electromagnetic induction into a direct current to meet the power consumption requirements of the fault detection sensor 600. As an example, the commutator here can be implemented by an AC-DC converter.

[0089] In the low-resistance idler with the self-powered fault detection function formed by the present invention, by integrally arranging the fault detection sensor 600 on the inner ring of the bearing 300 in the low-resistance idler, a self-powered structure based on electromagnetic induction is formed through the magnetic pole power generation and sealing assembly 500 built in the low-resistance idler, so as to automatically supply power to the built-in fault detection sensor 600, without the need to supply power to the built-in fault detection sensor 600 from outside the idler, ensuring the stable reliability of the power supply for the built-in monitoring sensor of the idler.

[0090] Specifically, for the built-in magnetic pole power generation and sealing assembly 500, a first magnetic circuit is formed in the inner cavity of the bearing seat 200 through the magnetic pole sleeve group 510, and the coil 520 fixedly sleeved on the rotating shaft 400 is matched and distributed in the first magnetic circuit and is electrically connected to the fault detection sensor 600.

[0091] On this basis, when the idler runs, the rotating shaft 400 rotates in the bearing 300, and can synchronously drive the coil 520 and the fault detection sensor 600 to rotate. When the coil 520 rotates, it will cut the first magnetic circuit formed by the magnetic pole sleeve group 510 to generate an electric field inside the coil 520, and can supply power to the fault detection sensor 600 through the coil wire 540; after the fault detection sensor 600 is powered on, it will be able to monitor the running state of the idler in real time, and timely detect problems such as bearing jamming and wear caused by the intrusion of dust and moisture, so as to effectively prevent the occurrence of major accidents.

[0092] In addition, when the idler runs, the lubricating oil leaked, the magnetic field and electric field generated during the rotation of the bearing are respectively sealed and isolated by the sealing structure formed by the magnetic pole power generation sealing component 500 and the magnetic fluid sealing component 700 (as described above, details are not elaborated here), ensuring the stable and reliable operation of the entire idler.

[0093] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-resistance idler with a self-powered fault detection function, comprising a roller body, a bearing seat fixedly arranged in the roller body, a bearing arranged in the bearing seat, and a rotating shaft penetrating through the bearing; characterized in that, It also includes a magnetic pole power generation sealing assembly and a fault detection sensor located in the inner cavity of the bearing housing; The fault detection sensors are distributed on the inner side of the bearing and are arranged on the inner ring of the bearing, and can rotate synchronously with the rotating shaft in the bearing; The magnetic power generation sealing assembly is distributed on the inner side of the bearing, and includes a magnetic pole sleeve group, a coil, and a first magnetic fluid. The magnetic pole sleeve group is press-fitted in the inner cavity of the bearing housing and coaxially surrounds the outside of the rotating shaft, and forms a first magnetic circuit; The coil is sleeved on the rotating shaft corresponding to the magnetic pole sleeve group and is electrically connected to the fault detection sensor. The coil can rotate synchronously with the rotating shaft, and can cut the first magnetic circuit generated by the magnetic pole sleeve group during rotation to generate an electric field inside the coil and supply power to the transmitted fault detection sensor; The first magnetic fluid is filled between the magnetic pole sleeve group and the coil, and forms a sealing structure between the bearing housing and the inner cavity of the roller body under the restraint of the first magnetic circuit generated by the magnetic pole sleeve group.

2. The low-resistance idler with self-powered fault detection function according to claim 1, wherein The magnetic pole sleeve group includes at least a pair of magnetic poles, and at least a pair of magnetic poles are symmetrically distributed relative to the rotating shaft.

3. The low-resistance idler with a self-powered fault detection function according to claim 2, wherein, The magnetic pole sleeve group includes more than two pairs of magnetic poles. Each pair of magnetic poles is symmetrically distributed relative to the rotating shaft, and the adjacent magnetic poles along the circumferential direction of the rotating shaft are alternately distributed differently.

4. The low-resistance idler with a self-powered fault detection function according to claim 2, characterized in that, The magnetic pole sleeve group further includes a filler, and the filler is filled between adjacent magnetic poles.

5. The low-resistance idler with self-powered fault detection function according to claim 1, characterized in that, An insulating structure is formed between the rotating shaft and the coil.

6. The low-resistance idler with self-powered fault detection function according to claim 1, characterized in that, The low-resistance idler roller also includes a magnetic fluid sealing assembly, which is distributed on the outer side of the bearing and can form a liquid sealing structure with the rotating shaft.

7. The low-resistance idler with a self-powered fault detection function according to claim 6, characterized in that, The magnetic fluid sealing assembly includes a first pole shoe, a permanent magnet, a second pole shoe, and a second magnetic fluid. The first pole shoe and the second pole shoe are located in the inner cavity of the bearing housing, are arranged axially along the rotating shaft, and are coaxially distributed with the rotating shaft. The permanent magnet is arranged between the first pole shoe and the second pole shoe and forms a second magnetic circuit between the first pole shoe and the second pole shoe; the second magnetic fluid is filled between the first pole shoe, the second pole shoe and the rotating shaft, and forms a liquid sealing structure between the magnetic fluid sealing assembly and the rotating shaft under the restraint of the second magnetic circuit.

8. The low-resistance idler with self-powered fault detection function according to claim 7, wherein The low-resistance idler roller also includes a non-magnetic dust cover, which is fixed on the rotating shaft and is located outside the magnetic fluid sealing assembly.

9. The low-resistance idler with self-powered fault detection function according to claim 1, characterized in that, The magnetic power generation sealing assembly also includes a commutator, and the commutator is connected to the output end of the coil.

10. The low-resistance idler with a self-powered fault detection function according to claim 1, wherein, The fault detection sensor is one or more of a temperature sensor, a dust sensor, and a vibration sensor.

Images