Axial magnetizing annular permanent magnet coupling driving magnetic force measuring device

Abstract

The invention provides an axially-magnetized annular permanent magnet coupling driving magnetic force measuring device. The device comprises a top plate; the bottom plate is connected with the top plate through a plurality of stand column screw rods; the outer magnetic ring assembly is fixedly arranged on the bottom plate, and an inner magnetic ring assembly is arranged in the outer magnetic ring assembly; wherein the inner magnetic ring assembly is connected with the top plate through the rotary loading and measuring mechanism, and the inner magnetic ring assembly is driven by the rotary loading and measuring mechanism to move upwards, so that the axial relative distance between the inner magnetic ring assembly and the outer magnetic ring assembly is changed, and the axial load is measured.

Description

Technical Field

[0001] The invention relates to an axially magnetized annular permanent magnetic coupling driven magnetic force measuring device, belonging to the field of permanent magnetic couplers. Background Art

[0002] When oil and gas wells are being mined underground, they often encounter situations where the underground fluid pressure and flow rate increase due to some reason. When encountering the above situation, it is necessary to close the fluid channel in time to avoid causing major safety accidents.

[0003] Downhole safety valve is a downhole tool that prevents blowouts and ensures production safety. There are many ways to classify downhole safety valves. According to the driving method, they can be divided into hydraulic control drive, electric control magnetic coupling drive, etc. However, as the depth of the traditional hydraulic control safety valve gradually increases, a greater hydraulic pressure is required to drive the valve plate, which puts a greater test on the material of the control pipeline and the internal seal of the safety valve. The downhole safety valve driven by magnetic coupling can make up for this defect.

[0004] The magnetic coupling drive structure can realize linear reciprocating motion. It is a transmission machine without dynamic seal and completely leakage-free. It has the characteristics of reliable high-pressure sealing, no leakage, long service life, low vibration, low noise, etc. It has broad application prospects in the fields of petroleum, chemical industry, food, pharmaceuticals, etc. Compared with mechanical transmission, when the magnetic drive transmits force or torque, the driven shaft is not connected to the outside world, the dynamic sealing device is cancelled, and the variable seal is changed to a static seal, which fundamentally eliminates the leakage of the shaft seal. Therefore, it is widely used in environments with special requirements for sealing. Summary of the invention

[0005] In view of the above technical problems existing in the prior art, the present invention proposes an axially magnetized annular permanent magnet coupling driven magnetic force measuring device, which has the characteristics of high measurement accuracy and safety and reliability.

[0006] The present invention proposes an axially magnetized annular permanent magnet coupling driven magnetic force measuring device, comprising:

[0007] roof;

[0008] A bottom plate, wherein the bottom plate is connected to the top plate via a plurality of column screws; and

[0009] An outer magnetic ring assembly is fixedly arranged on the bottom plate, and an inner magnetic ring assembly is arranged inside the outer magnetic ring assembly;

[0010] Wherein, the inner magnetic ring assembly is connected to the top plate through a rotating loading and measuring mechanism. The inner magnetic ring assembly moves upward under the drive of the rotating loading and measuring mechanism, thereby changing the axial relative distance between the inner magnetic ring assembly and the outer magnetic ring assembly to measure the axial load.

[0011] A further improvement of the present invention lies in that the rotation loading and measuring mechanism includes a first tension loading rod and a second tension loading rod. The first tension loading rod is connected to the second tension loading rod through a left-handed screw, and the second tension loading rod is connected to the inner magnetic ring assembly through a first right-handed screw.

[0012] A further improvement of the present invention lies in that the rotation loading and measuring mechanism further includes an S-shaped force sensor. The first tension loading rod is connected to the S-shaped force sensor through a second right-handed screw, and the S-shaped force sensor is connected to the top plate through a third right-handed screw.

[0013] The first tension loading rod and the second tension loading rod provide tension for the inner magnetic ring assembly, driving the inner magnetic ring to move upward, thereby changing the axial relative distance between the inner magnetic ring assembly and the outer magnetic ring assembly. The S-shaped force sensor measures the axial load.

[0014] The inner magnetic ring sleeve is raised or lowered by left-handed and right-handed rotation. The function of the left-handed screw is that its upper end is a left-handed thread and its lower end is a right-handed thread. In this way, when we rotate, it can be ensured that the following loading rod rises or falls simultaneously with the middle left-handed screw.

[0015] A further improvement of the present invention lies in that the rotation loading and measuring mechanism further includes a wire-type displacement sensor connecting the top plate and the inner magnetic ring assembly.

[0016] A further improvement of the present invention lies in that the outer magnetic ring assembly includes an outer magnetic ring sleeve fixed on the bottom plate, an outer magnetic ring washer and an outer magnetic ring arranged in the outer magnetic ring washer. A detachable pressing plate for fixing the outer magnetic ring is provided at the top of the outer magnetic ring sleeve.

[0017] A further improvement of the present invention lies in that the inner magnetic ring assembly includes an inner magnetic ring sleeve connected to the first right-handed screw. An inner magnetic ring and an inner magnetic ring washer are arranged outside the inner magnetic ring sleeve, and the inner magnetic ring and the inner magnetic ring washer are sleeved inside the outer magnetic ring.

[0018] The outer magnetic ring sleeve is preferably an organic glass sleeve. The outer magnetic ring and the outer magnetic ring washer are placed concentrically inside the organic glass sleeve; a plurality of outer magnetic ring washers are sandwiched between the outer magnetic rings, and the number of outer magnetic ring washers can be adjusted as needed to adjust the axial distance between the outer magnetic rings.

[0019] A further improvement of the present invention lies in that the bottom plate is fixed in a constant temperature container, and a constant temperature controller is arranged inside the constant temperature container.

[0020] The inside of the constant temperature container is filled with a liquid constant temperature agent. The inner magnetic ring and the outer magnetic ring assembly are immersed in the constant temperature container filled with liquid. The liquid can be water, oil, or other liquids, and the liquid temperature is adjusted and set by the constant temperature controller.

[0021] A further improvement of the present invention lies in that both the inner magnetic ring washer and the outer magnetic ring washer are made of polytetrafluoroethylene non-magnetic material.

[0022] A further improvement of the present invention lies in that the magnetization method of the inner magnetic ring and the outer magnetic ring is axial magnetization. Both the inner magnetic ring and the outer magnetic ring are made of neodymium iron boron permanent magnet material, and the axial placement directions of the inner magnetic ring and the outer magnetic ring are opposite.

[0023] The magnetization method of the inner magnetic ring and the outer magnetic ring is axial magnetization. Both the inner magnetic ring and the outer magnetic ring are made of neodymium iron boron permanent magnet material, and the axial placement directions of the inner magnetic ring and the outer magnetic ring are opposite. In the device of this embodiment, other components are all made of stainless steel without magnetism.

[0024] A further improvement of the present invention lies in that the outer magnetic ring sleeve is an organic glass sleeve.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] The axially magnetized annular permanent magnet coupling drive magnetic force measuring device of the present invention has reasonable design, high measurement accuracy, and is safe and reliable.

[0027] The axially magnetized annular permanent magnet coupling drive magnetic force measuring device of the present invention aims to measure the influence of the relative axial displacement of the inner and outer magnetic rings on the axial magnetic force under laboratory conditions, and seek the maximum axial magnetic force, and can measure the influence law of the axial interval of multiple groups of magnetic rings on their axial magnetic force; at the same time, by changing the working environment temperature of the magnetic rings, the influence of temperature on the axial magnetic force can be measured.

[0028] The axially magnetized annular permanent magnet coupling drive magnetic force measuring device of the present invention uses the rotation of the loading rod to drive the inner magnetic ring sleeve to move upward, thereby changing the relative displacement of the inner and outer magnetic rings, and obtaining the change law of the axial load of the magnetic rings through the tension and compression sensor. By changing the thickness of the inner and outer magnetic ring washers, the change law of the axial load of the magnetic rings when the distance between the magnetic ring groups is different can be obtained. The overall experimental device has a clever structural design, is simple to operate, reliable and safe in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The preferred embodiments of the present invention will be described in detail below with reference to the drawings. In the drawings:

[0030] Figure 1 Shown is a schematic structural diagram of an axially magnetized annular permanent magnet coupling drive magnetic force measuring device according to an embodiment of the present invention.

[0031] The drawings are not drawn to actual scale.

[0032] The meanings of the reference numerals in the drawings are as follows:

[0033] 1. Top plate, 2. S-type force sensor, 3. Column screw, 4. Left-handed stud, 5. Pull-wire displacement sensor, 6. Inner magnetic ring sleeve, 7. Pressure plate, 8. Outer magnetic ring, 9. Outer magnetic ring gasket, 10. Inner magnetic ring gasket, 11. Inner magnetic ring, 12. Screw, 13. Bottom plate, 14. Outer magnetic ring sleeve, 15. Constant temperature container, 16. Constant temperature controller, 17. First tension loading rod, 18. Third right-handed stud, 19. Nut, 20. Second tension loading rod, 21. First right-handed stud, 22. Second right-handed stud. DETAILED DESCRIPTION

[0034] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0035] When oil and gas wells are being mined underground, they often encounter situations where the underground fluid pressure and flow rate increase due to some reason. When encountering the above situation, it is necessary to close the fluid channel in time to avoid causing major safety accidents.

[0036] Downhole safety valve is a downhole tool that prevents blowouts and ensures production safety. There are many ways to classify downhole safety valves. According to the driving method, they can be divided into hydraulic control drive, electric control magnetic coupling drive, etc. However, as the depth of the traditional hydraulic control safety valve gradually increases, a greater hydraulic pressure is required to drive the valve plate, which puts a greater test on the material of the control pipeline and the internal seal of the safety valve. The downhole safety valve driven by magnetic coupling can make up for this defect.

[0037] The magnetic coupling drive structure can realize linear reciprocating motion. It is a transmission machine without dynamic seal and completely leakage-free. It has the characteristics of reliable high-pressure sealing, no leakage, long service life, low vibration, low noise, etc. It has broad application prospects in the fields of petroleum, chemical industry, food, pharmaceuticals, etc. Compared with mechanical transmission, when the magnetic drive transmits force or torque, the driven shaft is not connected to the outside world, the dynamic sealing device is cancelled, and the variable seal is changed to a static seal, which fundamentally eliminates the leakage of the shaft seal. Therefore, it is widely used in environments with special requirements for sealing.

[0038] To solve the above problems, the present invention provides the described axial magnetization ring permanent magnet coupled drive magnetic force measurement device, which is reasonably designed, has high measurement accuracy, and is safe and reliable. The axial magnetization ring permanent magnet coupled drive magnetic force measurement device of the present invention aims to measure the influence of the relative axial displacement of the inner and outer magnetic rings 8 on the axial magnetic force under laboratory conditions, seek the maximum axial magnetic force, and be able to measure the influence law of the axial spacing of multiple groups of magnetic rings on their axial magnetic force; at the same time, by changing the working environment temperature of the magnetic rings, the influence of temperature on the axial magnetic force can be measured.

[0039] The axial magnetization ring permanent magnet coupled drive magnetic force measurement device includes:

[0040] A top plate 1 and a bottom plate 13. Both the bottom plate 13 and the top plate 1 are plate-like structures, which can be circular plates, rectangular plates or other similar cylindrical shapes. The bottom plate 13 is arranged at the bottom, and the top plate 1 is arranged at the top. The bottom plate 13 and the top plate 1 are connected by several column screws 3. Preferably, the number of column screws 3 can be three, four or more, mainly playing a supporting role.

[0041] An outer magnetic ring assembly is arranged on the bottom plate 13. The outer magnetic ring assembly is fixedly connected to the bottom plate 13 through detachable connectors such as screws 12 or bolts. The outer magnetic ring assembly is fixed on the bottom plate and remains stationary during the measurement process, and is used to provide a fixed magnetic field.

[0042] An inner magnetic ring assembly is arranged inside the outer magnetic ring assembly. The inner magnetic ring assembly is connected to the top plate 1 through a rotation loading and measurement mechanism. The magnetization methods of the inner magnetic ring 11 and the outer magnetic ring 8 are axial magnetization, and the axial placement directions of the inner magnetic ring 11 and the outer magnetic ring 8 are opposite.

[0043] The inner magnetic ring assembly moves upward under the drive of the rotation loading and measurement mechanism, thereby changing the axial relative distance between the inner magnetic ring assembly and the outer magnetic ring assembly, and measuring the axial load.

[0044] In the axial magnetization ring permanent magnet coupled drive magnetic force measurement device according to this embodiment, the top plate 1 and the bottom plate 13 play a supporting role. Through the rotation loading and measurement mechanism, power can be provided for the experiment, and at the same time, the axial load can be measured.

[0045] The inner magnetic ring assembly can move up and down. When the inner magnetic ring assembly moves up, the inner magnetic ring assembly and the outer magnetic ring assembly move relatively, so there is a magnetic force between the inner magnetic ring assembly and the outer magnetic ring assembly. By measuring the axial tensile force value and subtracting the weight of the entire device, the mutual suction force between the inner magnetic ring assembly and the outer magnetic ring assembly can be obtained.

[0046] In one embodiment, the rotation loading and measuring mechanism comprises an axially arranged first tension loading rod 17 and a second tension loading rod 20, and the first tension loading rod 17 and the second tension loading rod 20 are connected in series along the axial direction. Preferably, the lower end of the first tension loading rod 17 is connected to the upper end of the second tension loading rod 20 through a left-handed stud 4, and the lower end of the second tension loading rod 20 is connected to the inner magnetic ring assembly through a first right-handed stud 21.

[0047] In a preferred embodiment, the rotation loading and measuring mechanism further includes an S-type force sensor 2, the first tension loading rod 17 is connected to the S-type force sensor 2 via a second right-handed stud 22, and the S-type force sensor 2 is connected to the top plate 1 via a third right-handed stud 18. Furthermore, the third right-handed stud 18 is connected to the top plate 1 via a nut 19.

[0048] In the axially magnetized annular permanent magnet coupling driven magnetic force measuring device described in this embodiment, the first tension loading rod 17 and the second tension loading rod 20 provide tension for the inner magnetic ring assembly, driving the inner magnetic ring 11 to move upward, thereby changing the axial relative distance between the inner magnetic ring assembly and the outer magnetic ring assembly, and the S-type force sensor 2 measures the axial load.

[0049] The inner magnetic ring 11 sleeve 6 is raised or lowered by left-handed and right-handed rotation; the function of the left-handed stud 4 is: its upper end is a left-handed thread, and the lower end is a right-handed thread. In this way, when we rotate, we can ensure that the loading rod below rises or falls at the same time as the middle left-handed stud 4.

[0050] When the inner magnetic ring 11 and the sleeve 6 rise, the inner magnetic ring 11 and the outer magnetic ring 8 are offset, so that there is a magnetic force between them. The pulling force can be measured by the sensor, and the weight of the entire device minus the weight is the mutual attraction between the inner and outer magnetic rings 8.

[0051] The present invention can obtain the variation law of the axial magnetic force when the axial displacements of the inner and outer magnetic rings 8 are different, obtain the variation law of the axial load of the magnetic rings when the intervals of multiple groups of magnetic rings are different, and can measure the variation of the axial magnetic force when the ambient temperature changes. The overall experimental device has an ingenious structural design, is simple to operate, and has high reliability and safety.

[0052] In one embodiment, the rotation loading and measuring mechanism further comprises a wire-drawing displacement sensor 5, which is arranged between the top plate 1 and the inner magnetic ring assembly. The wire-drawing displacement sensor 5 can detect the displacement data of the inner magnetic ring assembly.

[0053] In a preferred embodiment, the outer magnetic ring assembly includes an outer magnetic ring sleeve 14, and an outer magnetic ring washer 9 and an outer magnetic ring 8 are arranged inside the outer magnetic ring sleeve 14; the outer magnetic ring sleeve 14 includes a bottom surface and a side surface, the bottom surface is a circular structure and is fixedly connected to the bottom plate 13 through screws 12, and the side surface is a cylindrical structure.

[0054] An outer magnetic ring washer 9 and an inner magnetic ring 11 are arranged inside the outer magnetic ring sleeve 14, and the outer magnetic ring washer 9 is sandwiched between the outer magnetic rings 8. And a detachable pressing plate 7 for fixing the outer magnetic ring 8 is arranged at the top of the outer magnetic ring sleeve 14. The pressing plate 7 is a circular ring structure and is installed at the upper end of the outer magnetic ring washer 9, so that an annular groove is formed inside the outer magnetic ring washer 9 for installing the outer magnetic ring 8.

[0055] In the axially magnetized annular permanent magnet coupling driving magnetic force measuring device according to this embodiment, the outer magnetic ring sleeve 14 is preferably a plexiglass sleeve. The outer magnetic ring 8 and the outer magnetic ring washer 9 are placed concentrically inside the plexiglass sleeve; a plurality of outer magnetic ring washers 9 are sandwiched between the outer magnetic rings 8, and the number of outer magnetic ring washers 9 can be adjusted as needed to adjust the axial distance between the outer magnetic rings 8.

[0056] The pressing plate 7 can play a role in fixing the outer magnetic ring 8, and during the experiment, the pressing plate 7 can prevent the outer magnetic ring 8 from moving around.

[0057] In one embodiment, the inner magnetic ring assembly includes an inner magnetic ring 11 sleeve 6 connected to a first right-handed stud 21, an inner magnetic ring 11 is arranged outside the inner magnetic ring 11 sleeve 6, and the inner magnetic ring 11 is sleeved inside the outer magnetic ring 8.

[0058] In this embodiment, the inner magnetic ring 11 sleeve 6 is a cylindrical structure, the inner magnetic ring 11 is sleeved on the inner magnetic ring 11 sleeve 6, and an inner magnetic ring washer 10 is further arranged in the middle of the inner magnetic ring 11. When installing the device according to this embodiment, the number of inner magnetic ring washers 10 is adjusted as needed to adjust the axial distance between the inner magnetic rings 11.

[0059] In one embodiment, the bottom plate 13 is fixed in a constant temperature container 15, and a constant temperature controller 16 is arranged inside the constant temperature container 15.

[0060] Preferably, the inside of the constant temperature container 15 is filled with a liquid constant temperature agent. The inner magnetic ring 11 and the outer magnetic ring 8 group are immersed in the constant temperature container 15 filled with liquid, and the liquid can be water, oil, or other liquids, and the liquid temperature is adjusted and set by the constant temperature controller 16.

[0061] In one embodiment, both the inner magnetic ring washer 10 and the outer magnetic ring washer 9 are made of a polytetrafluoroethylene non-magnetic material.

[0062] The magnetization method of the inner magnetic ring 11 and the outer magnetic ring 8 is axial magnetization. Both the inner magnetic ring 11 and the outer magnetic ring 8 are made of neodymium iron boron permanent magnet materials, and the axial placement directions of the inner magnetic ring 11 and the outer magnetic ring 8 are opposite. Other components in the device of this embodiment are all made of stainless steel and are non-magnetic.

[0063] The screw bolt can be used as a transmission shaft to transmit power from one end to the other end. Utilizing the spiral-shaped thread, the screw bolt can accurately transmit torque and can adapt to different transmission requirements by changing the shape and size of the thread.

[0064] According to the device of this embodiment, in view of the key factors of the structure design of the axial magnetization annular permanent magnet coupling drive structure in the prior art, such as the influence of the relative displacement of the magnetic rings and the working environment temperature on the axial magnetic force, this embodiment is a device invented for facilitating the above-mentioned measurement in the laboratory.

[0065] The purpose of the present invention is to provide a magnetic force measurement device for an axial magnetization annular permanent magnet coupling drive structure with reasonable design, high measurement accuracy, and safety and reliability. The present invention aims to measure the influence of the relative axial displacement of the inner and outer magnetic rings on the axial magnetic force under laboratory conditions, and seek the maximum axial magnetic force, and can measure the influence law of the axial spacing of multiple groups of magnetic rings on their axial magnetic force; at the same time, by changing the working environment temperature of the magnetic rings, the influence of temperature on the axial magnetic force can be measured.

[0066] Embodiment 1

[0067] The axial magnetization annular permanent magnet coupling drive magnetic force measurement device includes:

[0068] A top plate 1 and a bottom plate 13. Both the bottom plate 13 and the top plate 1 are plate-shaped structures, which can be circular plates, rectangular plates or other similar cylindrical shapes. The bottom plate 13 is arranged at the bottom, and the top plate 1 is arranged at the top. Between the bottom plate 13 and the top plate 1, they are connected by several column screws 3. Preferably, the number of column screws 3 can be three, four or more, mainly playing a supporting role.

[0069] An outer magnetic ring assembly is arranged on the bottom plate 13. The outer magnetic ring assembly is fixedly connected to the bottom plate 13 through detachable connectors such as screws 12 or bolts. The outer magnetic ring assembly is fixed on the bottom plate and remains stationary during the measurement process, and is used to provide a fixed magnetic field.

[0070] An inner magnetic ring assembly is arranged inside the outer magnetic ring assembly. The inner magnetic ring assembly is connected to the top plate 1 through a rotation loading and measurement mechanism. The magnetization method of the inner magnetic ring 11 and the outer magnetic ring 8 is axial magnetization, and the axial placement directions of the inner magnetic ring 11 and the outer magnetic ring 8 are opposite.

[0071] The inner magnetic ring assembly moves upward under the drive of the rotation loading and measuring mechanism, thereby changing the axial relative distance between the inner magnetic ring assembly and the outer magnetic ring assembly, and measuring the axial load.

[0072] The rotation loading and measuring mechanism includes a first tension loading rod 17 and a second tension loading rod 20 arranged axially. The first tension loading rod 17 and the second tension loading rod 20 are connected in series along the axis. Preferably, the lower end of the first tension loading rod 17 is connected to the upper end of the second tension loading rod 20 through a left-handed stud 4, and the lower end of the second tension loading rod 20 is connected to the inner magnetic ring assembly through a first right-handed stud 21.

[0073] The rotation loading and measuring mechanism further includes an S-type force sensor 2. The first tension loading rod 17 is connected to the S-type force sensor 2 through a second right-handed stud 22, and the S-type force sensor 2 is connected to the top plate 1 through a third right-handed stud 18. Moreover, the third right-handed stud 18 is connected to the top plate 1 through a nut 19.

[0074] In the axially magnetized annular permanent magnet coupling drive magnetic force measuring device according to this embodiment, the top plate 1 and the bottom plate 13 play a supporting role. The rotation loading and measuring mechanism can provide the driving force for the experiment and measure the axial load at the same time.

[0075] The inner magnetic ring assembly can move up and down. When the inner magnetic ring assembly rises, relative movement occurs between the inner magnetic ring assembly and the outer magnetic ring assembly. In this way, there is a magnetic force between the inner magnetic ring assembly and the outer magnetic ring assembly. By measuring the axial tension value and subtracting the weight of the entire device, the mutual suction force between the inner magnetic ring assembly and the outer magnetic ring assembly can be obtained.

[0076] The rotation loading and measuring mechanism further includes a wire-pulling displacement sensor 5. The wire-pulling displacement sensor 5 is arranged between the top plate 1 and the inner magnetic ring assembly. The wire-pulling displacement sensor 5 can detect the displacement data of the inner magnetic ring assembly.

[0077] The outer magnetic ring assembly includes an outer magnetic ring sleeve 14. An outer magnetic ring washer 9 and an outer magnetic ring 8 are arranged inside the outer magnetic ring sleeve 14; the outer magnetic ring sleeve 14 includes a bottom surface and a side surface. The bottom surface is a circular structure and is fixedly connected to the bottom plate 13 through a screw 12, and the side surface is a cylindrical structure.

[0078] An outer magnetic ring washer 9 and an inner magnetic ring 11 are arranged inside the outer magnetic ring sleeve 14, and the outer magnetic ring washer 9 is sandwiched between the outer magnetic rings 8. Moreover, a detachable pressing plate 7 for fixing the outer magnetic ring 8 is arranged at the top of the outer magnetic ring sleeve 14. The pressing plate 7 is a circular ring structure and is installed at the upper end of the outer magnetic ring washer 9, so as to form an annular groove on the inner side of the outer magnetic ring washer 9 for installing the outer magnetic ring 8.

[0079] The inner magnetic ring assembly includes an inner magnetic ring 11 sleeve 6 connected to the first right-handed stud 21. An inner magnetic ring 11 is disposed outside the inner magnetic ring 11 sleeve 6, and the inner magnetic ring 11 is sleeved inside the outer magnetic ring 8.

[0080] The inner magnetic ring 11 sleeve 6 is of a cylindrical structure. The inner magnetic ring 11 is sleeved on the inner magnetic ring 11 sleeve 6, and an inner magnetic ring washer 10 is further disposed in the middle of the inner magnetic ring 11. When installing the device according to this embodiment, the number of inner magnetic ring washers 10 is adjusted as needed, so as to adjust the axial distance between the inner magnetic rings 11.

[0081] The bottom plate 13 is fixed in a constant temperature container 15, and a constant temperature controller 16 is disposed inside the constant temperature container 15. The constant temperature container 15 is filled with a liquid constant temperature agent. The inner magnetic ring 11 and the outer magnetic ring 8 assembly are immersed in the constant temperature container 15 filled with a liquid. The liquid can be water, oil, or other liquids, and the liquid temperature is adjusted and set by the constant temperature controller 16. The inner magnetic ring washer 10 and the outer magnetic ring washer 9 are both made of a polytetrafluoroethylene non-magnetic material.

[0082] In the present invention, the loading rod is rotated to drive the inner magnetic ring sleeve to move upward, so as to change the relative displacement between the inner and outer magnetic rings. The change law of the axial load of the magnetic ring is obtained through a tensile and compressive force sensor. By changing the thickness of the inner and outer magnetic ring washers, the change law of the axial load of the magnetic ring when the distance between the magnetic ring groups is different is obtained. The overall experimental device has a clever structural design, is simple to operate, and has high reliability and safety when in use.

[0083] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should extend to equivalent alternatives of these features understood by those of ordinary skill in the relevant art. It should also be understood that the terms used herein are only for the purpose of describing specific embodiments and do not mean to limit.

[0084] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0085] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] Certain terms are used throughout this application to refer to particular system components. As those skilled in the art will recognize, the same component may generally be referred to by different names, and thus this application is not intended to distinguish components that differ only in name and not in function. The phrase "one embodiment" or "an embodiment" as used in the specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the phrase "one embodiment" or "an embodiment" that appears throughout the specification does not necessarily all refer to the same embodiment.

[0087] The embodiments of the present invention are given for purposes of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed form. Many modifications and variations will be obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to best explain the principles of the invention and its practical application, and to enable those of ordinary skill in the art to understand the invention so as to design various embodiments with various modifications suitable for a particular purpose.

[0088] Although the preferred embodiments of the present invention have been described, additional changes and modifications can be made by those skilled in the art once they learn of the basic inventive concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and / or modifications that fall within the scope of the present invention. All changes and / or modifications made in accordance with the embodiments of the present invention should be covered within the protection scope of the present invention.

Claims

1. An axially magnetized annular permanent magnet coupled drive magnetic force measuring device, characterized in that, Comprising: Top plate (1); Bottom plate (13), which is connected to the top plate (1) by a number of column screws (3); and An outer magnetic ring assembly fixedly arranged on the bottom plate (13), and an inner magnetic ring assembly is arranged inside the outer magnetic ring assembly; Wherein, the inner magnetic ring assembly is connected to the top plate (1) through a rotation loading and measuring mechanism, and the inner magnetic ring assembly moves upward under the drive of the rotation loading and measuring mechanism, thereby changing the axial relative distance between the inner magnetic ring assembly and the outer magnetic ring assembly, and measuring the axial load.

2. The axial magnetization ring permanent magnet coupling drive magnetic force measuring device according to claim 1, characterized in that The rotation loading and measuring mechanism includes a first tension loading rod (17) and a second tension loading rod (20), the first tension loading rod (17) is connected to the second tension loading rod (20) through a left-handed screw (4), and the second tension loading rod (20) is connected to the inner magnetic ring assembly through a first right-handed screw (21).

3. The axially magnetized annular permanent magnet coupled drive magnetic force measuring device according to claim 2, wherein, The rotation loading and measuring mechanism further includes an S-type force sensor (2), the first tension loading rod (17) is connected to the S-type force sensor (2) through a second right-handed screw (22), and the S-type force sensor (2) is connected to the top plate (1) through a third right-handed screw (18).

4. The axially magnetized annular permanent magnet coupled drive magnetic force measuring device according to claim 3, characterized in that, The rotation loading and measuring mechanism further includes a wire-type displacement sensor (5) connecting the top plate (1) and the inner magnetic ring assembly.

5. The axially magnetized annular permanent magnet coupling drive magnetic force measuring device according to claim 4, characterized in that, The outer magnetic ring assembly includes an outer magnetic ring sleeve (14) fixed on the bottom plate (13), an outer magnetic ring washer (9) and an outer magnetic ring (8) arranged inside the outer magnetic ring washer (9), and a detachable pressing plate (7) for fixing the outer magnetic ring (8) is arranged at the top of the outer magnetic ring sleeve (14).

6. The axially magnetized annular permanent magnet coupled drive magnetic force measuring device according to claim 5, wherein The inner magnetic ring assembly includes an inner magnetic ring (11) sleeve (6) connected to the first right-handed screw (21), an inner magnetic ring (11) and an inner magnetic ring washer (10) are arranged outside the inner magnetic ring (11) sleeve (6), and the inner magnetic ring (11) and the inner magnetic ring washer (10) are sleeved inside the outer magnetic ring (8).

7. The axial magnetization ring permanent magnet coupling drive magnetic force measuring device according to claim 6, characterized in that The bottom plate (13) is fixed in a constant temperature container (15), and a constant temperature controller (16) is arranged inside the constant temperature container (15).

8. The axially magnetized annular permanent magnet coupled drive magnetic force measuring device according to claim 7, characterized in that, Both the inner magnetic ring washer (10) and the outer magnetic ring washer (9) are made of polytetrafluoroethylene non-magnetic material.

9. The axially magnetized annular permanent magnet coupled drive magnetic force measuring device according to claim 8, characterized in that, The magnetization method of the inner magnetic ring (11) and the outer magnetic ring (8) is axial magnetization, both the inner magnetic ring (11) and the outer magnetic ring (8) are made of neodymium iron boron permanent magnet material, and the axial placement directions of the inner magnetic ring (11) and the outer magnetic ring (8) are opposite.

10. The axially magnetized annular permanent magnet coupled drive magnetic force measuring device according to any one of claims 5 to 9, characterized in that, The outer magnetic ring sleeve (14) is an organic glass sleeve.

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