Self-powered wireless transmission type tension-compression magnetostrictive force sensor

Abstract

The present invention relates to the field of magnetostrictive force sensors. Disclosed is a self-powered wireless transmission type tension-compression magnetostrictive force sensor. The self-powered wireless transmission type tension-compression magnetostrictive force sensor comprises an inner wall of a barrel wall, a pressure ring and a lower end shaft, which enclose a mounting cavity, wherein an input shaft passes through the pressure ring to be arranged at a top opening of the barrel wall, and is connected to a connecting shaft; an upper piezoelectric ceramic ring sheet is provided between the input shaft and a piezoelectric ceramic ring sheet baffle, and a lower piezoelectric ceramic ring sheet is provided between the connecting shaft and the piezoelectric ceramic ring sheet baffle; an upper permanent magnet is provided in a recess between a fixing frame end cover and a fixing frame; a magnetostrictive rod is provided in an inner cavity of the fixing frame; an upper magnetically conductive sheet and a preload spring are arranged at the upper end of the magnetostrictive rod, and a lower magnetically conductive sheet is arranged at the lower end of the magnetostrictive rod; a lower permanent magnet is sleeved on a lower permanent magnet baffle; and an energy collection module and a data acquisition and radio frequency transmission output module are arranged in the barrel wall. The present invention helps to realize the self-powering of a device, tracks in real time the force conditions of a rotor of each aircraft and a pitch link thereof, and reduces maintenance costs.

Description

Self-powered wireless transmission type tension and compression magnetostrictive force sensor TECHNICAL FIELD

[0001] The present application relates to the technical field of magnetostrictive force sensors, and particularly relates to a self-powered wireless transmission type tension and compression magnetostrictive force sensor. BACKGROUND

[0002] During high-speed flight of a helicopter, sharp maneuvering flight can cause serious structural stress of a propeller variable-pitch connecting rod, and if the stress is too large, an accident can be caused, and a new rotor variable-pitch rod load monitoring sensor system is needed for load monitoring of the rotor variable-pitch rod.

[0003] A traditional power supply mode is to provide energy by using a chemical battery, and a wireless sensor that needs to provide energy for a long time needs to replace the battery regularly, which not only brings many inconveniences and economic burdens to the wireless sensor, but also causes environmental pollution. The inherent shortcomings of the chemical battery limit the application of portable electronic devices and wireless sensors, and become one of the bottlenecks of the development. Mechanical vibration is ubiquitous in nature, and has a high energy density, so that an energy collector based on mechanical vibration has advantages such as long-term power supply, not easy to be limited by weather and application occasions, and thus becomes a research field that is increasingly concerned. The piezoelectric energy collector has advantages such as simple structure, high energy density, long service life, and compatibility with MEMS.

[0004] As a core component in a monitoring diagnosis and intelligent control system, the performance of a sensor directly determines the quality of a test result and influences a final diagnosis conclusion, so any sensor first needs to meet the requirements of sensitivity and linearity. In addition, once the structure of the sensor is too complex and the working condition is poor, the stability of the sensor will be reduced, and faults are prone to occur. At this time, the sensor that is convenient to disassemble and assemble can shorten the maintenance period and reduce economic losses. Therefore, the sensors at the present stage develop in the direction of simple structure and wireless testing. The magnetostrictive effect and its inverse effect can realize mutual conversion between magnetic energy and mechanical energy.

[0005] For an information transmission and collection system, a traditional mode is a wired connection mode, which limits the number of layout lines and occupies a large space. At present, with rapid development of a wireless layout mode, more and more systems adopt a wireless mode.

[0006] Therefore, how to provide a self-powered wireless transmission type tension and compression magnetostrictive force sensor to achieve the effects of simple structure, real-time perception, fast response, and high stability is a problem that needs to be solved by those skilled in the art. SUMMARY

[0007] Therefore, the self-powered wireless transmission type tension and compression magnetostrictive force sensor can realize self-powered function of the sensor and can monitor the stress and strain of the aircraft rotor in real time.

[0008] A self-powered wireless transmission type tension and compression magnetostrictive force sensor comprises:

[0009] The barrel wall, the compression ring and the lower end shaft are arranged to form an installation cavity.

[0010] The input shaft is arranged at the opening of the top of the barrel wall through the compression ring.

[0011] The upper piezoelectric ceramic ring piece and the lower piezoelectric ceramic ring piece are arranged between the input shaft and the connecting shaft from top to bottom.

[0012] The upper permanent magnet is arranged between the fixed frame end cover and the upper end of the fixed frame, the magnetostrictive rod is arranged in the fixed frame inner cavity, the slot is arranged on one side of the fixed frame for pasting the Hall element at the slot of the fixed frame, the Hall element is in contact with the magnetostrictive rod, and the upper magnetic guide piece and the lower magnetic guide piece are arranged at the upper end and the lower end of the magnetostrictive rod.

[0013] The pre-tightening spring is arranged between the upper magnetic guide piece and the connecting shaft.

[0014] The lower end of the fixed frame is connected with the lower permanent magnet, and the position of the lower permanent magnet is fixed by the lower permanent magnet baffle.

[0015] The chip end cover and the chip barrel wall are arranged in the space formed by the lower permanent magnet baffle, the barrel wall and the lower end shaft, and the energy collection module and the data acquisition and wireless radio frequency transmission output module are arranged between the chip end cover and the chip barrel wall.

[0016] Optionally, the compression ring and the barrel wall are connected by threads, and the position of the piezoelectric ceramic ring piece baffle is fixed.

[0017] The input shaft and the connecting shaft are connected by threads, the upper piezoelectric ceramic ring piece and the lower piezoelectric ceramic ring piece are arranged on the connecting shaft, and the upper piezoelectric ceramic ring piece and the lower piezoelectric ceramic ring piece are separated by the piezoelectric ceramic ring piece baffle.

[0018] In addition, the piezoelectric ceramic ring piece baffle is provided with two symmetrical through holes for the lead wires of the upper piezoelectric ceramic ring piece and the lower piezoelectric ceramic ring piece to pass through the through holes and connect to the subsequent circuit.

[0019] Optionally, the inner diameter of the compression ring matches the outer diameter of the stop ring of the input shaft, the upper end of the compression ring is lower than the upper end of the input shaft, and the inner diameter of the compression ring matches the outer diameter of the stop ring of the input shaft.

[0020] The inner diameter of the upper piezoelectric ceramic ring, the inner diameter of the lower piezoelectric ceramic ring, the inner diameter of the piezoelectric ceramic ring partition, and the outer diameter of the connecting shaft threaded hole are equal to each other.

[0021] The inner diameter of the fixed frame is equal to the inner diameter of the upper permanent magnet, the outer diameter of the upper end of the fixed frame is equal to the outer diameter of the upper permanent magnet, the fixed frame end cover is connected with the fixed frame, the outer diameter of the lower end of the fixed frame, the outer diameter of the lower permanent magnet, and the outer diameter of the upper permanent magnet are equal to each other, the lower permanent magnet is sleeved on the lower permanent magnet baffle, the diameter of the lower end of the lower permanent magnet baffle is equal to the inner diameter of the barrel wall, and two symmetrical through holes are punched.

[0022] The diameter of the upper magnetic guide sheet, the diameter of the lower magnetic guide sheet, the diameter of the magnetostrictive rod, and the outer diameter of the pre-tightening spring are equal to the inner diameter of the groove of the lower permanent magnet baffle.

[0023] The lower surface of the fixed frame is glued to the upper surface of the lower permanent magnet, and the lower surface of the lower permanent magnet is glued to the upper surface of the lower permanent magnet baffle.

[0024] The height of the upper magnetic guide sheet is lower than the height of the upper permanent magnet, and the height of the lower magnetic guide sheet is higher than the height of the lower permanent magnet.

[0025] The upper magnetic guide sheet is arranged on the top surface of the magnetostrictive rod, and the lower magnetic guide sheet is arranged on the bottom surface of the magnetostrictive rod, for guiding the magnetic flux of the upper permanent magnet and the lower permanent magnet.

[0026] The upper permanent magnet and the lower permanent magnet have opposite polarities on opposite surfaces, for applying a bias magnetic field to the magnetostrictive rod.

[0027] The chip end cover and the lower permanent magnet baffle are connected by means of a countersunk screw, the chip barrel wall and the lower end shaft are connected by means of a countersunk screw, the chip end cover and the chip barrel wall are threadedly connected, and a through hole is left in the chip barrel wall.

[0028] The lower permanent magnet baffle and the inner side of the barrel wall are threadedly connected, the lower end shaft and the inner side of the barrel wall are threadedly connected, and the lower end shaft is provided with a stop ring, which is tightly attached to the bottom of the barrel wall, so as to avoid interference fit phenomenon of the lower end shaft when rotating into the inner side of the barrel wall, thereby limiting the lower end shaft and the lower permanent magnet baffle.

[0029] Compared with the prior art, the self-powered wireless transmission type tension-compression magnetostrictive force sensor has the following beneficial effects: the self-powered function of the sensor is realized, the traditional chemical power supply mode is abandoned, the stress and strain of the aircraft rotor are monitored, the wireless transmission of data is realized, the daily maintenance cost of the aircraft is effectively reduced, the accuracy of the helicopter load monitoring data is improved, and the safety performance during the flight of the helicopter is improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only a part of the embodiments of the present application, and all other drawings obtained by those skilled in the art without creative effort based on the provided drawings also belong to the protection scope of the present application.

[0031] Fig. 1 is a structure diagram of a self-powered wireless transmission type tension-compression magnetostrictive force sensor disclosed by the present application;

[0032] Fig. 2 is an application schematic diagram of a self-powered wireless transmission type tension-compression magnetostrictive force sensor disclosed by the present embodiment;

[0033] Among them, 1-energy collection module, 2-lower permanent magnet baffle, 3-lower permanent magnet, 4-Hall element, 5-fixing frame, 6-upper permanent magnet, 7-connection shaft, 8-lower piezoelectric ceramic ring piece, 9-piezoelectric ceramic ring piece partition, 10-upper piezoelectric ceramic ring piece, 11-input shaft, 12-fixing frame end cover, 13-pressing ring, 14-pre-tightening spring, 15-upper magnetic conducting sheet, 16-magnetostrictive rod, 17-lower magnetic conducting sheet, 18-barrel wall, 19-data acquisition and wireless radio frequency transmission output module, 20-chip end cover, 21-chip barrel wall, 22-lower end shaft. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0035] In this application, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between such entities or operations, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0036] Referring to FIG. 1, the application discloses a self-powered wireless transmission type tension-compression magnetostrictive force sensor, comprising:

[0037] The barrel wall 18, the compression ring 13 and the lower end shaft 22 are enclosed to form a mounting cavity between the inner wall of the barrel wall 18, the compression ring 13 and the lower end shaft 22.

[0038] The input shaft 11 is arranged at the top opening of the barrel wall 18 through the compression ring 13.

[0039] The input shaft 11 is threadedly connected with the connecting shaft 7, and the upper piezoelectric ceramic ring piece 10 and the lower piezoelectric ceramic ring piece 8 are arranged between the input shaft 11 and the connecting shaft 7 from top to bottom in sequence, so that a piezoelectric ceramic ring piece is always subjected to force and further energized except when the input shaft 11 is subjected to pressure F. In addition, the piezoelectric ceramic ring piece partition plate 9 is arranged between the upper piezoelectric ceramic ring piece 10 and the lower piezoelectric ceramic ring piece 8.

[0040] The upper permanent magnet 6 is arranged between the fixed frame end cover 12 and the upper end of the fixed frame 5, the upper permanent magnet 6 is sleeved on the fixed frame 5, the fixed frame 5 has a cantilever beam structure ring, which cooperates with the fixed frame end cover 12 to fix the position of the upper permanent magnet 6, the fixed frame 5 is provided with the magnetostrictive rod 16 in the inner cavity, the fixed frame 5 is provided with the slot hole, the horizontal Hall element 4 is attached to the slot hole, the top end of the Hall element 4 abuts against the magnetostrictive rod 16, the upper magnetic guide piece 15 and the lower magnetic guide piece 17 are arranged at the upper end and the lower end of the magnetostrictive rod 16 respectively, and the pre-tightening spring 14 is arranged between the upper magnetic guide piece 15 and the input shaft 11, so that the magnetostrictive rod 16 is subjected to a pre-tightening force.

[0041] The lower end of the fixed frame 5 is connected with the lower permanent magnet 3, and the position of the lower permanent magnet 3 is fixed by the lower permanent magnet baffle 2 to prevent the position of the lower permanent magnet 3 from changing, in addition, the lower surface of the fixed frame 5 and the upper surface of the lower permanent magnet 3, and the lower surface of the lower permanent magnet 3 and the upper surface of the lower permanent magnet baffle 2 are subjected to glue bonding treatment.

[0042] The lower permanent magnet baffle 2 is provided with a chip end cover 20 and a chip barrel wall 21 in the cavity between the barrel wall 18 and the lower end shaft 22, and the energy collection module 1 and the data acquisition and wireless radio frequency transmission output module 19 are placed between the chip end cover 20 and the chip barrel wall 21.

[0043] Further, the compression ring 13 is threadedly connected with the barrel wall 18, used for fixing the position of the piezoelectric ceramic ring sheet partition 9 and preventing it from moving; at the same time, the piezoelectric ceramic ring sheet partition 9 plays a role in isolating the upper piezoelectric ceramic ring sheet 10 and the lower piezoelectric ceramic ring sheet 8, so as to ensure that only one piezoelectric ceramic ring sheet can generate voltage in the working state.

[0044] Further, the input shaft 11 is threadedly connected with the connecting shaft 7, the upper piezoelectric ceramic ring sheet 10 and the lower piezoelectric ceramic ring sheet 8 are sleeved on the connecting shaft 7, and the upper piezoelectric ceramic ring sheet 10 and the lower piezoelectric ceramic ring sheet 8 are separated by the piezoelectric ceramic ring sheet partition 9.

[0045] The distance between the non-contact surface between the input shaft 11 and the connecting shaft 7 is equal to the thickness of the upper piezoelectric ceramic ring sheet 10, the lower piezoelectric ceramic ring sheet 8 and the piezoelectric ceramic ring sheet partition 9. The input shaft 11 and the compression ring 13 are sealed by sealing glue.

[0046] The input shaft 11 is provided with threads and is threadedly connected with the connecting shaft 7, so that the force on the input shaft 11 can be transmitted to the connecting shaft 7, and then transmitted to the magnetostrictive rod 16 through the pre-tightening spring 14 and the upper magnetic conductive sheet 15.

[0047] Further, the piezoelectric ceramic ring sheet partition 9 is provided with two symmetrical through holes, used for the lead wires of the upper piezoelectric ceramic ring sheet 10 and the lower piezoelectric ceramic ring sheet 8 to pass through the through holes and connect to the subsequent circuit.

[0048] Further, the inner diameter of the compression ring 13 matches the outer diameter of the blocking ring of the input shaft 11, the upper end of the compression ring 13 is lower than the upper end of the input shaft 11, and sealing glue is used for sealing treatment between the two.

[0049] Further, the inner diameter of the upper piezoelectric ceramic ring sheet 10, the inner diameter of the lower piezoelectric ceramic ring sheet 8 and the inner diameter of the piezoelectric ceramic ring sheet partition 9 are equal to the outer diameter of the threaded hole at the upper end of the connecting shaft 7.

[0050] Further, the inner diameter of the inner cavity of the fixed frame 5 is equal to the inner diameter of the upper permanent magnet 6, the outer diameter of the upper end ring of the fixed frame 5 is equal to the outer diameter of the upper permanent magnet 6, the fixed frame end cover 12 is connected with the fixed frame 5, the outer diameter of the lower end of the fixed frame 5, the outer diameter of the lower permanent magnet 3, and the outer diameter of the upper permanent magnet 6 are equal, and the lower permanent magnet 3 is sleeved on the lower permanent magnet baffle 2, the lower end diameter of the lower permanent magnet baffle 2 is equal to the inner diameter of the barrel wall 18, and the lower permanent magnet baffle 2 is provided with two symmetrical through holes.

[0051] Specifically, the fixed frame 5 is glued with the fixed frame end cover 12, the outer diameter of the upper end of the fixed frame 5 and the outer diameter of the lower end of the fixed frame end cover 12 are equal to the inner diameter of the upper permanent magnet 6, and the outer diameter of the upper end cantilever beam structure of the fixed frame 5 is equal to the outer diameter of the upper permanent magnet 6.

[0052] Further, the diameter of the upper magnetic guide sheet 15, the diameter of the lower magnetic guide sheet 17, the diameter of the magnetostrictive rod 16, and the diameter of the inner cavity of the fixed frame 5 are equal to the inner diameter of the recess of the lower permanent magnet baffle 2, and the outer diameter of the pre-tightening spring 14 is equal to the diameter of the inner cavity of the fixed frame 5.

[0053] The lower surface of the fixed frame 5 is glued with the upper surface of the lower permanent magnet 3 and the lower surface of the lower permanent magnet 3 is glued with the upper surface of the lower permanent magnet baffle 2.

[0054] Further, the height of the upper magnetic guide sheet 15 is lower than the height of the upper permanent magnet 6, and the height of the lower magnetic guide sheet 17 is higher than the height of the lower permanent magnet 3.

[0055] The top surface of the magnetostrictive rod 6 is provided with the upper magnetic guide sheet 15 and the bottom surface is provided with the lower magnetic guide sheet 17, which is used to guide the magnetic flux of the upper permanent magnet 6 and the lower permanent magnet 3.

[0056] Further, the opposite faces of the upper permanent magnet 6 and the lower permanent magnet 3 have opposite polarities, which is used to apply a bias magnetic field to the magnetostrictive rod 16.

[0057] Further, the lower permanent magnet baffle 2 is threadedly connected with the inner cavity of the barrel wall 18, the chip end cover 20 is connected with the lower permanent magnet baffle 2 by means of a countersunk screw, the chip barrel wall 21 is connected with the lower end bearing 22 by means of a countersunk screw, the chip end cover 20 is threadedly connected with the chip barrel wall 21, and a through hole is left at the chip barrel wall 21; the lower end bearing 22 is threadedly connected with the inner cavity of the barrel wall 18.

[0058] The lower end shaft 22 is screwed to the inner side of the barrel wall 18, and the lower end shaft 22 is provided with a retaining ring abutting the bottom of the barrel wall to avoid interference fit when the lower end shaft 22 is screwed into the inner side of the barrel wall 18, thereby limiting the lower end shaft 22 and the lower permanent magnet baffle 2, and cooperating with the piezoelectric ceramic ring plate 9, the connecting shaft 7, the magnetostrictive rod 16, the upper magnetic guide sheet 15 and the lower magnetic guide sheet 17 to leave a certain position space for the pre-tightening spring 14, so as to determine the spring pre-tightening force.

[0059] Further, the pre-tightening spring 14 is subjected to a pre-tightening force F, and at this moment the magnetostrictive rod 16 and the lower piezoelectric ceramic ring plate 8 are subjected to the force F, which ensures that the magnetostrictive rod 16 is subjected to the force when the input shaft 11 is subjected to pressure or tension.

[0060] Further, the energy collection module 1 is designed in an integrated manner with the data acquisition and wireless radio frequency transmission module 19, and the integrated chip height is the same as the depth of the inner cavity of the chip barrel wall 21, and a through hole is provided on the side of the chip barrel wall 21, and the required lead of the chip is pulled out from the through hole in advance.

[0061] Further, the upper piezoelectric ceramic ring plate 10 and the lower piezoelectric ceramic ring plate 8 are subjected to the force to generate energy during the operation of the rotor, thereby realizing the self-power supply function. The energy generated by the piezoelectric ceramic is collected and stored by the energy collection module 1, the voltage output pin lead of the energy collection module 1 is connected with the input pin lead of the Hall element 4 and the data acquisition and wireless radio frequency transmission output module 19, the energy collection module 1 is used to supply power to the Hall element 4 and the data acquisition and wireless radio frequency transmission output module 19, the voltage signal of the output end of the Hall element 4 is converted into a digital signal by an ADC and connected with the input end of the data acquisition and wireless radio frequency transmission output module 19, thereby realizing the monitoring of the voltage signal of the Hall element 4. In addition, during the flight of the aircraft, if the force of the rotor does not change, the electric energy stored in the energy collection module 1 can maintain a certain working time for the Hall element 4 and the data acquisition and wireless radio frequency transmission output module 19, thereby ensuring the uninterrupted monitoring of the rotor load.

[0062] Specifically, the lower end shaft 22, the input shaft 11 and the connecting shaft 7 are limited, and the pre-tightening spring 14 between the connecting shaft 7 and the upper magnetic conductive sheet 15 is also fixed and subjected to a certain amount of pre-tightening force F. The force applied to the input shaft 11 in the initial state is 0, the connecting shaft 7, the input shaft 11 and the lower piezoelectric ceramic ring sheet 8 are subjected to a force F in one direction, in the working process, the screw rod is subjected to force, the input shaft 11 applies force, and the pressure F0 is applied between 0≤F0<F, the lower piezoelectric ceramic ring sheet 8 is subjected to pressure to generate energy, and the upper piezoelectric ceramic ring sheet 10 is not subjected to force. When the input shaft 11 applies a pressure of F, the upper and lower piezoelectric ceramic ring sheets are not subjected to force. When the input shaft 11 applies a pressure greater than F, the lower piezoelectric ceramic ring sheet 8 is not subjected to force, and the upper piezoelectric ceramic ring sheet 10 is subjected to force to generate electric energy; when the input shaft 11 applies tension, the upper piezoelectric ceramic ring sheet 10 is not subjected to force, and the lower piezoelectric ceramic ring sheet 8 is subjected to force to generate energy. This ensures that the input shaft 11 is subjected to force greater than F or force less than F, and there is always a piezoelectric ceramic ring sheet that can be subjected to force, vibration, a certain amount of electric charge, and self-power function. When the input shaft 11 is subjected to a pressure F, the piezoelectric ceramic ring sheet is not subjected to force and does not generate energy, but the energy collection module 1 still has electric energy and can still realize the rotor load monitoring. In addition, the state of the input shaft 11 subjected to the pressure F is maintained for a very short time, which has no effect on the whole energy collection. The energy collection module 1 collects the generated electric charge to supply power to the Hall element 4 and the data acquisition and wireless radio frequency transmission output module 19; the magnetostrictive sensor takes the magnetostrictive rod 16 as the main core structure, and high magnetic conductive sheets are placed above and below the magnetostrictive rod 16, which can guide the magnetic flux and make the magnetic flux density in the magnetostrictive rod 16 uniform.

[0063] Specifically, a slot hole is formed in the fixed frame 5, and a horizontally placed Hall element 4 is tightly attached to the slot hole, the top end of the Hall element 4 abuts against the magnetostrictive rod 16, and the Hall element 4 is powered by the voltage generated by the piezoelectric ceramic and collected by the energy collection module 1, the Hall element 4 is placed in the bias magnetic field generated by the upper permanent magnet 6 and the lower permanent magnet 3, and when the magnetostrictive rod 16 is subjected to dynamic force under the action of the input shaft 11, the magnetic permeability of the magnetostrictive rod 16 changes. Since the magnetostrictive rod 16 is located in the magnetic field generated by the permanent magnet, the change of the magnetic permeability affects the change of the magnetic flux, and further causes the change of the voltage of the Hall element 4, the voltage is converted into a digital signal by a signal adjusting circuit and is collected by a data acquisition circuit, and the Hall element 4 can also detect the size of the bias magnetic field applied to the whole structure by the upper permanent magnet 6 and the lower permanent magnet 3; the magnetic induction intensity on the magnetostrictive rod 16 can be measured by collecting the voltage signal output by the Hall element 4, and the size of the force applied by the input shaft 11 can be detected.

[0064] Referring to Fig. 2, the self-powered wireless transmission type tension-compression magnetostrictive force sensor is composed of an energy collector, a magnetostrictive load sensor, a wireless intelligent transmission and an embedded load monitoring system. In the process of input shaft 11 applying force to the piezoelectric stack, the piezoelectric stack generates electric energy, which is stored into the battery through capacitor, AC / DC conversion, voltage stabilizer and voltage amplifier, etc. process, forming an energy collector. The energy collector powers the magnetostrictive load sensor, wireless intelligent transmission and embedded load monitoring system. The output end of the Hall element 4 inside the magnetostrictive load sensor is connected to the embedded load monitoring system through voltage stabilizing and filtering, A / D conversion, etc. The system analyzes the detected signal and transmits it to the host interface through wireless intelligent transmission to realize force monitoring. Through the above, the self-powered function of the sensor is realized, and the rotor load size is monitored in real time.

[0065] In order to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been described above in general terms. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0066] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A self-powered wireless transmission type tension-compression magnetostrictive force sensor, characterized by, It comprises: a barrel wall (18), a compression ring (13) and a lower end shaft (22), the barrel wall (18), the compression ring (13) and the lower end shaft (22) form an installation cavity; an input shaft (11) is arranged at the top opening of the barrel wall (18) through the compression ring (13); an upper piezoelectric ceramic ring piece (10) and a lower piezoelectric ceramic ring piece (8) are arranged between the input shaft (11) and the connecting shaft (7) from top to bottom, and a piezoelectric ceramic ring piece partition plate (9) is arranged between the upper piezoelectric ceramic ring piece (10) and the lower piezoelectric ceramic ring piece (8); an upper permanent magnet (6) is arranged between the fixed frame end cover (12) and the upper end of the fixed frame (5), a magnetostrictive rod (16) is arranged in the inner cavity of the fixed frame (5), a slot hole is formed on the fixed frame (5), a Hall element (4) is horizontally attached to the slot hole, and the top end of the Hall element (4) abuts against the magnetostrictive rod (16), and an upper magnetic guide piece (15) and a lower magnetic guide piece (17) are arranged at the upper and lower ends of the magnetostrictive rod (16) respectively; a pre-tightening spring (14) is arranged between the upper magnetic guide piece (15) and the connecting shaft (7); the lower end of the fixed frame (5) is connected with a lower permanent magnet (3), and the position of the lower permanent magnet (3) is fixed by a lower permanent magnet baffle (2); a chip end cover (20) and a chip barrel wall (21) are arranged in the space enclosed by the lower permanent magnet baffle (2), the barrel wall (18) and the lower end shaft (22), and an energy collection module (1) and a data acquisition and wireless radio frequency transmission output module (19) are arranged between the chip end cover (20) and the chip barrel wall (21).

2. The self-powered wireless transmission type tension-compression type magnetostrictive force sensor according to claim 1, wherein the compression ring (13) and the barrel wall (18) are connected by threads, and are used to fix the position of the piezoelectric ceramic ring piece partition plate (9); the input shaft (11) and the connecting shaft (7) are connected by threads, the upper piezoelectric ceramic ring piece (10) and the lower piezoelectric ceramic ring piece (8) are sleeved on the connecting shaft (7), and the upper piezoelectric ceramic ring piece (10) and the lower piezoelectric ceramic ring piece (8) are separated by the piezoelectric ceramic ring piece partition plate (9); in addition, two symmetrical through holes are arranged on the piezoelectric ceramic ring piece partition plate (9), which are used for the lead wires of the upper piezoelectric ceramic ring piece (10) and the lower piezoelectric ceramic ring piece (8) to pass through the through holes and connect to the subsequent circuit.

3. The self-powered wireless transmission type tension-compression type magnetostrictive force sensor according to claim 1, wherein the inner diameter of the compression ring (13) matches the outer diameter of the blocking ring of the input shaft (11), the upper end of the compression ring (13) is lower than the upper end of the input shaft (11), and in addition, sealing glue is used for sealing treatment between the two.

4. The self-powered wireless transmission type tension-compression type magnetostrictive force sensor according to claim 1, wherein the inner diameter of the upper piezoelectric ceramic ring piece (10), the inner diameter of the lower piezoelectric ceramic ring piece (8) and the inner diameter of the piezoelectric ceramic ring piece partition plate (9) are equal to the outer diameter of the threaded hole of the connecting shaft (7). The inner diameter of the inner cavity of the fixed frame (5) is equal to the inner diameter of the upper permanent magnet (6), the outer diameter of the upper end ring of the fixed frame (5) is equal to the outer diameter of the upper permanent magnet (6), the fixed frame end cover (12) is connected with the fixed frame (5), the lower end outer diameter of the fixed frame (5), the outer diameter of the lower permanent magnet (3), and the outer diameter of the upper permanent magnet (6) are equal, and the lower permanent magnet (3) is sleeved on the lower permanent magnet baffle (2), the lower end diameter of the lower permanent magnet baffle (2) is equal to the inner diameter of the barrel wall (18), and the lower permanent magnet baffle (2) is provided with two symmetrical through holes; The diameter of the upper magnetic guide sheet (15), the diameter of the lower magnetic guide sheet (17), the diameter of the magnetostrictive rod (16), and the outer diameter of the pre-tightening spring (14) are equal to the inner diameter of the groove of the lower permanent magnet baffle (2).

5. The self-powered wireless transmission type tension and compression magnetostrictive force sensor according to claim 1, wherein The lower surface of the fixed frame (5) is glued to the upper surface of the lower permanent magnet (3), and the lower surface of the lower permanent magnet (3) is glued to the upper surface of the lower permanent magnet baffle (2).

6. The self-powered wireless transmission type tension and compression magnetostrictive force sensor according to claim 1, wherein The height of the upper magnetic guide sheet (15) is lower than the height of the upper permanent magnet (6), and the height of the lower magnetic guide sheet (17) is higher than the height of the lower permanent magnet (3); The top surface of the magnetostrictive rod (16) is provided with the upper magnetic guide sheet (15), and the bottom surface is provided with the lower magnetic guide sheet (17), which is used for guiding the magnetic flux of the upper permanent magnet (6) and the lower permanent magnet (3).

7. The self-powered wireless transmission type tension and compression magnetostrictive force sensor according to claim 1, wherein The upper permanent magnet (6) and the lower permanent magnet (3) have opposite polarities on opposite surfaces, which is used for applying a bias magnetic field to the magnetostrictive rod (16).

8. The self-powered wireless transmission type tension and compression magnetostrictive force sensor according to claim 1, wherein The chip end cover (20) and the lower permanent magnet baffle (2) are connected by means of a countersunk screw, the chip barrel wall (21) and the lower end shaft (22) are connected by means of a countersunk screw, the chip end cover (20) and the chip barrel wall (21) are threadedly connected, and a through hole is left at the chip barrel wall (21).

9. The self-powered wireless transmission type tension and compression magnetostrictive force sensor according to claim 1, wherein The lower permanent magnet baffle (2) and the inner side of the barrel wall (18) are threadedly connected, the lower end shaft (22) and the inner side of the barrel wall (18) are threadedly connected, and the lower end shaft (22) is provided with a stop ring, which is tightly attached to the bottom of the barrel wall, so as to avoid the interference fit phenomenon of the lower end shaft (22) when it is screwed into the inner side of the barrel wall (18), thereby limiting the lower end shaft (22) and the lower permanent magnet baffle (2).

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