Axial magnetic bearing stiffness testing device

Abstract

The present invention discloses an axial magnetic bearing stiffness test device, which relates to the field of magnetic bearing testing technology, and includes a test bench, wherein the bottom surface of the test bench is provided with support feet at equal angles, the top surface of the rear end of the support feet is fixedly provided with a support seat, the top of the support seat is fixedly provided with a limit seat, and the interior of the limit seat is connected with a stiffness test mechanism. The support feet in the axial magnetic bearing stiffness test device can stably support the test bench, and the setting of the limit seat can limit the lifting and sliding of the stiffness test mechanism, thereby avoiding the offset of the stiffness test mechanism during the lifting process, thereby improving the stability of the axial magnetic bearing stiffness test device, and the symmetrical setting of the side plate and the displacement sensor can perform comparative detection of the displacement change of the magnetic bearing body during the test process, which is conducive to avoiding errors and improving the accuracy of the axial magnetic bearing stiffness test device.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic bearing testing, in particular to an axial magnetic bearing stiffness testing device. Background Art

[0002] Magnetic bearings are non-contact high-performance bearings manufactured using the principle that the same two poles of a magnet repel each other. They have the advantages of low mechanical wear and low noise. Magnetic bearings are usually used in the transmission structure of industrial machinery. In order to ensure stability, the magnetic bearings need to be tested axially using a stiffness test device. However, the existing axial magnetic bearing stiffness test device still has certain defects during use.

[0003] For example, an axial magnetic bearing stiffness testing device proposed in application number CN201921827108.2 comprises a bearing fixing device for arranging the axial magnetic bearing to be tested, wherein the axial magnetic bearing to be tested is placed flat on the bearing fixing device, and also comprises a thrust plate fixing device for arranging a thrust plate, wherein a force sensor is connected between the thrust plate fixing device and the thrust plate, and the direction of the force between the force sensor and the thrust plate is in a vertical direction. In actual use, during the positioning of the magnetic bearing, the device needs to rotate multiple sets of screws separately to drive the clamping blocks to clamp and position the magnetic bearing, which will cause the clamping operation to have complicated steps, and the concentricity of the magnetic bearing and the thrust plate cannot be guaranteed, which will cause the magnetic bearing to be offset, thereby reducing the effect of the stiffness test.

[0004] Therefore, we proposed an axial magnetic bearing stiffness testing device to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide an axial magnetic bearing stiffness testing device to solve the problems raised in the above background technology that it is not convenient to clamp and position the magnetic bearing in a convenient manner and the concentricity between the magnetic bearing and the thrust plate cannot be guaranteed.

[0006] To achieve the above object, the present invention provides the following technical solution: an axial magnetic bearing stiffness testing device, comprising a test bench,

[0007] The bottom surface of the test bench is provided with supporting feet at equal angles, the top surface of the rear end of the supporting feet is fixedly provided with a supporting seat, the top end of the supporting seat is fixedly provided with a limiting seat, and the inside of the limiting seat is connected with a stiffness testing mechanism;

[0008] A displacement sensor is installed on the top surface of the test bench;

[0009] A multi-directional clamping mechanism is installed at the bottom of the test bench, and a magnetic bearing body is clamped and installed inside the multi-directional clamping mechanism.

[0010] Preferably, the stiffness testing mechanism includes a transmission screw rotatably installed inside the limit seat, the top end of the transmission screw is connected to a servo motor, the servo motor is fixedly connected to the top of the limit seat, and the outer ring of the transmission screw located inside the limit seat is provided with a lifting seat.

[0011] Preferably, the transmission screw cooperates with the limiting seat and the lifting seat to form a limiting lifting structure.

[0012] Preferably, the stiffness testing mechanism also includes a pressure sensor fixedly mounted on the front end of the lifting seat, a display assembly is mounted on the top of the pressure sensor, a thrust plate is connected to the bottom end of the pressure sensor, and side plates are fixedly mounted on both sides of the thrust plate.

[0013] Preferably, the displacement sensors are symmetrically distributed on the top surface of the test bench, and the positions of the displacement sensors correspond to the positions of the side panels.

[0014] The above-mentioned structural design facilitates stable stiffness testing of the clamped and positioned magnetic bearing body by lifting and lowering the stiffness testing mechanism. In addition, the stiffness testing mechanism can compare and detect the displacement changes of the magnetic bearing body in conjunction with symmetrically arranged displacement sensors during the stiffness testing, thereby avoiding errors and improving detection accuracy.

[0015] Preferably, a first positioning seat is symmetrically installed at the bottom of the multi-directional clamping mechanism, and a second positioning seat and a third positioning seat are also installed on the bottom surface of the test bench. The first positioning seat, the second positioning seat and the third positioning seat are distributed at equal angles on the bottom surface of the test bench.

[0016] Preferably, the multi-directional clamping mechanism also includes a first adjusting screw rotatably connected to the inside of the first positioning seat, a second adjusting screw rotatably connected to the inside of the second positioning seat, a third adjusting screw rotatably installed inside the third positioning seat, and the threads at both ends of the first adjusting screw are opened in opposite directions.

[0017] Preferably, the multi-directional clamping mechanism also includes a first bevel gear fixedly installed in the middle of the first adjusting screw, and the first bevel gear is vertically meshed with second bevel gears on both sides, and the second bevel gears on both sides are fixedly connected to the second adjusting screw and the third adjusting screw respectively.

[0018] Preferably, the multi-directional clamping mechanism also includes a movable seat sleeved on the outer rings of the first adjusting screw, the second adjusting screw and the third adjusting screw, and limiting grooves are provided at equal angles on the inner side of the test bench, and a clamping plate is fixedly connected to the inner side of the top end of the movable seat, and the inner side of the clamping plate is clamped and connected to the magnetic bearing body.

[0019] Preferably, the limiting groove is connected to the movable seat in a limiting sliding manner.

[0020] The design of the above structure facilitates the multi-directional synchronous clamping of the magnetic bearing body through the multi-directional clamping mechanism, simplifies the clamping operation steps, and at the same time, the synchronous multi-directional clamping of the multi-directional clamping mechanism can also ensure the concentricity of the magnetic bearing body and the thrust plate, which is beneficial for the pressure generated by the thrust plate to be evenly applied to the magnetic bearing body, avoiding deviation and improving the test effect.

[0021] Compared with the prior art, the beneficial effects of the present invention are: the axial magnetic bearing stiffness testing device;

[0022] 1. The supporting feet can stably support the test bench, and the setting of the limit seat can limit the lifting and sliding of the stiffness test mechanism, so as to avoid the offset of the stiffness test mechanism during the lifting process, thereby improving the stability of the axial magnetic bearing stiffness test device, and the symmetrical setting of the side plate and the displacement sensor can perform comparative detection of the displacement changes of the magnetic bearing body during the test, which is conducive to avoiding errors and improving the accuracy of the axial magnetic bearing stiffness test device;

[0023] 2. The setting of the multi-directional clamping mechanism can cooperate with the test bench to perform synchronous multi-directional clamping of the magnetic bearing body, which can effectively reduce the steps in the clamping and positioning process and improve the convenience of the clamping and positioning operation. At the same time, the multi-directional synchronous clamping can ensure that the magnetic bearing body is always located in the center of the test bench, which is beneficial to ensure the concentricity of the magnetic bearing body and the thrust plate, and is beneficial to the uniform application of the pressure generated by the thrust plate on the magnetic bearing body, thereby improving the use effect of the axial magnetic bearing stiffness test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a side view structural schematic diagram of the present invention;

[0025] Figure 2 It is a side view structural schematic diagram of the stiffness testing mechanism of the present invention;

[0026] Figure 3 It is a schematic diagram of the connection structure between the test bench and the multi-directional clamping mechanism of the present invention;

[0027] Figure 4 It is a schematic diagram of the side structure of the multi-directional clamping mechanism of the present invention;

[0028] Figure 5 It is a schematic diagram of the distribution structure of the first bevel gear and the second bevel gear of the present invention.

[0029] In the figure: 1. test bench; 2. supporting foot; 3. supporting seat; 4. limiting seat; 5. driving screw; 6. servo motor; 7. lifting seat; 8. pressure sensor; 9. display assembly; 10. thrust plate; 11. side plate; 12. displacement sensor; 13. first positioning seat; 14. second positioning seat; 15. third positioning seat; 16. first adjusting screw; 17. second adjusting screw; 18. third adjusting screw; 19. first bevel gear; 20. second bevel gear; 21. movable seat; 22. limiting groove; 23. clamping plate; 24. magnetic bearing body. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-5 The present invention provides a technical solution: an axial magnetic bearing stiffness test device, comprising a test bench 1, a support foot 2 is installed at an equal angle on the bottom surface of the test bench 1, a support seat 3 is fixedly installed on the top surface of the rear end of the support foot 2, a limit seat 4 is fixedly installed on the top of the support seat 3, a stiffness test mechanism is connected inside the limit seat 4, and the stiffness test mechanism includes a transmission screw 5 rotatably installed inside the limit seat 4, a servo motor 6 is connected to the top of the transmission screw 5, and the servo motor 6 is fixedly connected to the top of the limit seat 4. The transmission screw 5 located inside the limit seat 4 The outer ring of the rod 5 is provided with a lifting seat 7, and the transmission screw 5 cooperates with the limiting seat 4 and the lifting seat 7 to form a limiting lifting structure. The stiffness testing mechanism also includes a pressure sensor 8 fixedly installed at the front end of the lifting seat 7, and a display component 9 is installed on the top of the pressure sensor 8. The bottom end of the pressure sensor 8 is connected to a thrust plate 10, and side plates 11 are fixedly installed on both sides of the thrust plate 10. A displacement sensor 12 is installed on the top surface of the test bench 1. The displacement sensors 12 are symmetrically distributed on the top surface of the test bench 1, and the position of the displacement sensor 12 corresponds to the position of the side plate 11.

[0032] The design of the above structure enables, when testing the clamped magnetic bearing body 24, the transmission screw 5 is driven to rotate by controlling the servo motor 6, and then the transmission screw 5 drives the lifting seat 7 to perform a limited lifting and sliding movement inside the limit seat 4, which is beneficial to drive the pressure sensor 8 and the thrust plate 10 to synchronously descend to apply pressure to the magnetic bearing body 24 during descent, and the applied pressure can be displayed by the display component 9, wherein the thrust plate 10 can also drive the side plate 11 to synchronously descend during the descent process, so that the side plate 11 can squeeze the displacement sensor 12 according to the displacement change of the magnetic bearing body 24, so that the displacement sensor 12 can effectively display the displacement distance, and then the stiffness of the magnetic bearing body 24 can be obtained according to the displacement distance and the applied pressure, thereby improving the ease of use of the axial magnetic bearing stiffness testing device.

[0033] The bottom of the multi-directional clamping mechanism is symmetrically installed with a first positioning seat 13, and the bottom surface of the test bench 1 is also installed with a second positioning seat 14 and a third positioning seat 15. The first positioning seat 13, the second positioning seat 14 and the third positioning seat 15 are distributed at equal angles on the bottom surface of the test bench 1. The multi-directional clamping mechanism also includes a first adjusting screw 16 rotatably connected to the inside of the first positioning seat 13, the inside of the second positioning seat 14 is rotatably connected to the second adjusting screw 17, and the inside of the third positioning seat 15 is rotatably installed with a third adjusting screw 18. The threads at both ends of the first adjusting screw 16 are opened in opposite directions. The multi-directional clamping mechanism also includes a first adjusting screw 16 fixedly installed on the first adjusting screw 16. A first bevel gear 19 is provided in the middle of an adjusting screw 16, and second bevel gears 20 are vertically meshed and connected on both sides of the first bevel gear 19, and the second bevel gears 20 on both sides are fixedly connected to the second adjusting screw 17 and the third adjusting screw 18 respectively, and the multi-directional clamping mechanism also includes a movable seat 21 sleeved on the outer rings of the first adjusting screw 16, the second adjusting screw 17 and the third adjusting screw 18, and a limiting groove 22 is provided at equal angles on the inner side of the test bench 1, and the limiting groove 22 is limitedly slidably connected to the movable seat 21, and a clamping plate 23 is fixedly connected to the inner side of the top of the movable seat 21, and the inner side of the clamping plate 23 is clamped and connected to the magnetic bearing body 24;

[0034] The design of the above structure enables the magnetic bearing body 24 to be placed at the center of the top surface of the test bench 1 when clamping the magnetic bearing body 24, and then by rotating one of the first adjusting screw 16, the second adjusting screw 17 and the third adjusting screw 18, the vertical engagement of the first bevel gear 19 and the second bevel gear 20 can drive the other two groups to rotate synchronously, so that the first adjusting screw 16, the second adjusting screw 17 and the third adjusting screw 18 can drive the movable seat 21 to slide in a limited position inside the limit groove 22 when rotating, that is, move inward or outward. When the movable seat 21 moves inward, it will drive the clamping plate 23 to clamp the magnetic bearing body 24 synchronously in multiple directions to achieve the positioning of the magnetic bearing body 24. When the movable seat 21 moves outward, it will drive the clamping plate 23 to release the clamping of the magnetic bearing body 24 to achieve the unloading of the magnetic bearing body 24.

[0035] Thereby completing a series of tasks, the contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0036] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An axial magnetic bearing stiffness testing device, comprising a test bench (1), characterized in that: The bottom surface of the test bench (1) is provided with supporting feet (2) at equal angles, a supporting seat (3) is fixedly installed on the top surface of the rear end of the supporting feet (2), a limiting seat (4) is fixedly installed on the top of the supporting seat (3), and a stiffness testing mechanism is connected inside the limiting seat (4); A displacement sensor (12) is installed on the top surface of the test bench (1); A multi-directional clamping mechanism is installed at the bottom of the test bench (1), and a magnetic bearing body (24) is clamped and installed on the inner side of the multi-directional clamping mechanism.

2. The axial magnetic bearing stiffness testing device according to claim 1, characterized in that: The stiffness testing mechanism comprises a transmission screw (5) rotatably mounted inside a limit seat (4), the top end of the transmission screw (5) is connected to a servo motor (6), the servo motor (6) is fixedly connected to the top of the limit seat (4), and a lifting seat (7) is provided on the outer ring of the transmission screw (5) inside the limit seat (4).

3. The axial magnetic bearing stiffness testing device according to claim 2, characterized in that: The transmission screw (5) cooperates with the limiting seat (4) and the lifting seat (7) to form a limiting lifting structure.

4. The axial magnetic bearing stiffness testing device according to claim 2, characterized in that: The stiffness testing mechanism also includes a pressure sensor (8) fixedly mounted on the front end of the lifting seat (7), a display assembly (9) being mounted on the top end of the pressure sensor (8), a thrust plate (10) being connected to the bottom end of the pressure sensor (8), and side plates (11) being fixedly mounted on both sides of the thrust plate (10).

5. The axial magnetic bearing stiffness testing device according to claim 4, characterized in that: The displacement sensors (12) are symmetrically distributed on the top surface of the test bench (1), and the positions of the displacement sensors (12) correspond to the positions of the side plates (11).

6. The axial magnetic bearing stiffness testing device according to claim 1, characterized in that: A first positioning seat (13) is symmetrically mounted on the bottom of the multi-directional clamping mechanism, and a second positioning seat (14) and a third positioning seat (15) are also mounted on the bottom surface of the test bench (1); the first positioning seat (13), the second positioning seat (14) and the third positioning seat (15) are distributed at equal angles on the bottom surface of the test bench (1).

7. The axial magnetic bearing stiffness testing device according to claim 6, characterized in that: The multi-directional clamping mechanism also includes a first adjusting screw (16) rotatably connected to the inside of the first positioning seat (13), a second adjusting screw (17) rotatably connected to the inside of the second positioning seat (14), and a third adjusting screw (18) rotatably installed inside the third positioning seat (15), and the threads at both ends of the first adjusting screw (16) are opened in opposite directions.

8. The axial magnetic bearing stiffness testing device according to claim 7, characterized in that: The multi-directional clamping mechanism also includes a first bevel gear (19) fixedly mounted on the middle of the first adjusting screw (16), and second bevel gears (20) are vertically meshed and connected on both sides of the first bevel gear (19), and the second bevel gears (20) on both sides are respectively fixedly connected to the second adjusting screw (17) and the third adjusting screw (18).

9. The axial magnetic bearing stiffness testing device according to claim 8, characterized in that: The multi-directional clamping mechanism also includes a movable seat (21) sleeved on the outer rings of the first adjusting screw (16), the second adjusting screw (17) and the third adjusting screw (18); the inner side of the test bench (1) is provided with limit grooves (22) at equal angles; the inner side of the top end of the movable seat (21) is fixedly connected with a clamping plate (23); the inner side of the clamping plate (23) is clamped and connected to the magnetic bearing body (24).

10. The axial magnetic bearing stiffness testing device according to claim 9, characterized in that: The limiting groove (22) is connected to the movable seat (21) in a limiting sliding manner.

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