CN215894237U

CN215894237U - Moving-magnet type linear motor magnetic spring stiffness performance testing device and assembling and disassembling tool

Info

Publication number: CN215894237U
Application number: CN202121958295.5U
Authority: CN
Inventors: 林明嫱; 牟健; 池春云; 焦珂欣; 洪国同
Original assignee: Technical Institute of Physics and Chemistry of CAS
Current assignee: Technical Institute of Physics and Chemistry of CAS
Priority date: 2021-08-19
Filing date: 2021-08-19
Publication date: 2022-02-22
Anticipated expiration: 2031-08-19

Abstract

The utility model is suitable for the field of magnetic springs, and discloses a device for testing the rigidity performance of a magnetic spring of a moving magnet type linear motor and a loading and unloading tool, wherein the testing device comprises the loading and unloading tool, a tension pressure sensor and a displacement sensor, the loading and unloading tool comprises an outer bracket fixed on a stator component and a driving component used for driving a rotor component to axially move, the driving component is connected with the rotor component through the tension pressure sensor, the displacement sensor is arranged on the outer bracket, the loading and unloading tool drives the rotor component to axially move, the tension pressure sensor measures the stress of the rotor component at different positions in a magnetic field in real time, and the displacement sensor measures the axial displacement of the rotor component at different positions in real time to obtain the rigidity performance of the magnetic spring.

Description

Moving-magnet type linear motor magnetic spring stiffness performance testing device and assembling and disassembling tool

Technical Field

The utility model relates to the technical field of magnetic springs, in particular to a device for testing the rigidity performance of a magnetic spring of a moving magnet type linear motor and a loading and unloading tool.

Background

In the moving magnet type linear motor, the magnetic force interaction between permanent magnets is utilized, so that an object connected with the permanent magnets is subjected to magnetic force opposite to the motion direction in the reciprocating motion process, and a structure similar to the action of a spring is generated, namely a magnetic spring. The application of the magnetic spring not only can effectively replace an original external plate spring structure, so that the linear motor has a more compact structure, but also has no mechanical contact, and has the advantages of no abrasion, low power consumption, long service life, low noise and the like.

At present, research on magnetic springs is few, and a scholart analyzes an annular permanent magnet, a cylindrical permanent magnet and air gap magnetic conductance aiming at a magnetic spring in a shock absorber, provides a permanent magnet spring with 3 degrees of freedom and equal rigidity taking a radial direction as a working direction, and obtains a magnetic force value by measuring with a radial magnetic force method. However, at present, there is no testing device specially used for measuring the axial stiffness of the moving magnet type linear motor magnetic spring, and the influence rule of the elastic force of the magnetic spring changing along with the displacement cannot be accurately obtained.

Meanwhile, in the actual installation process of the rotor assembly of the magnetic spring, due to the fact that air gaps of magnetic fields at two ends are different, large repulsive force or attractive force can be generated, when manual assembly is adopted, the rotor assembly can be hardly stabilized at the balance position of the magnetic field finally, and even the risk of 'the magnetic block jumping out' can exist in the installation process. Therefore, there is a need to develop a device that facilitates efficient assembly of the mover assembly.

SUMMERY OF THE UTILITY MODEL

The utility model provides a device for testing the rigidity performance of a magnetic spring of a moving magnet type linear motor, which can obtain the rigidity performance of the magnetic spring according to the values of a tension pressure sensor and a displacement sensor.

In order to achieve the purpose, the utility model provides the following scheme:

the device for testing the rigidity performance of the magnetic spring of the moving magnet type linear motor comprises a loading and unloading tool, a tension and pressure sensor and a displacement sensor, the assembling and disassembling tool comprises an outer bracket fixed on the stator assembly, and a driving assembly arranged on the outer bracket and used for driving the rotor assembly to move axially relative to the stator assembly, the driving assembly is connected with the rotor assembly through the tension and pressure sensor, the tension and pressure sensor is used for measuring the stress of the rotor assembly at different positions in a magnetic field, the displacement sensor is arranged on the outer support, and is used for measuring the axial displacement of the rotor assembly at different positions, the assembling and disassembling tool drives the rotor assembly to axially move, the tension and pressure sensor measures the stress of the rotor assemblies at different positions in a magnetic field in real time, and the displacement sensor measures the axial displacement of the rotor assemblies at different positions in real time to obtain the rigidity of the magnetic spring.

As a preferred embodiment, the driving assembly includes a rotary screw threadedly coupled to the outer frame, one end of the tension/pressure sensor is coupled to the rotary screw, and the other end of the tension/pressure sensor is coupled to a central position of a piston of the mover assembly, and the displacement sensor measures axial displacement of the mover assembly at different positions by measuring axial displacement of the rotary screw.

In a preferred embodiment, the driving assembly further comprises a rotating nut sleeved on the rotating screw.

In a preferred embodiment, the drive assembly further comprises a handle disposed on the swivel nut.

As a preferred embodiment, the driving assembly further includes a plane bearing sleeved on the rotating screw, and the plane bearing is disposed between the rotating nut and the outer bracket.

As a preferred embodiment, the driving assembly further includes a first connection stud and a second connection stud, the rotating screw is connected to the pull pressure sensor through the first connection stud, and the pull pressure sensor is connected to the mover assembly through the second connection stud.

As a preferred embodiment, the testing device further comprises a sensor mounting support for adjusting the relative position of the displacement sensor and the loading and unloading tool, the sensor mounting support comprises a vertical rod, a horizontal rod and an adjusting knob, the horizontal rod and the vertical rod are connected through the adjusting knob, the vertical rod is mounted on the outer support, and the displacement sensor is arranged at one end of the horizontal rod far away from the vertical rod.

The second purpose of the utility model is to provide a loading and unloading tool for loading and unloading a rotor assembly in a magnetic spring, the loading and unloading tool comprises an outer bracket fixed on a stator assembly and a driving assembly arranged on the outer bracket, and the driving assembly is detachably connected with the rotor assembly and is used for driving the rotor assembly to axially move relative to the stator assembly until the rotor assembly is in a balance position.

In a preferred embodiment, the driving assembly includes a rotary screw threadedly coupled to the outer frame, one end of the rotary screw extends out of the outer frame, and the other end of the rotary screw is coupled to a central position of the piston of the mover assembly.

In a preferred embodiment, the driving assembly further comprises a rotating nut sleeved on the rotating screw and a handle arranged on the rotating nut.

The device for testing the rigidity performance of the magnetic spring of the moving-magnet linear motor drives the rotor assembly to axially move through the loading and unloading tool, measures the stress of the rotor assemblies at different positions in a magnetic field in real time through the tension pressure sensors connected with the loading and unloading tool and the rotor assemblies, and measures the axial displacement of the rotor assemblies at different positions in real time through the displacement sensors, so that the rigidity performance of the magnetic spring is obtained.

The assembling and disassembling tool can effectively realize assembling and disassembling of the rotor component in the moving magnet linear motors with various sizes, the assembling and disassembling tool is integrally fixed with the stator component through the arrangement of the outer support, and then is detachably connected with the rotor component through the driving component, so that the phenomenon of 'magnetic block jumping out' in the assembling process or disassembling process can be avoided, the assembling and disassembling are more convenient, and meanwhile, the driving component is used for driving the rotor component to axially move, so that the rotor component cannot deviate due to repulsion force or suction force generated by a magnetic field in the assembling process, namely, the coaxial assembling of the rotor component and the stator component is realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic diagram of a combination of a magnetic spring stiffness performance testing device and a magnetic spring of a moving-magnet linear motor according to an embodiment of the present invention;

fig. 2 is a schematic view of a combination of a loading and unloading tool and a magnetic spring according to an embodiment of the present invention.

The reference numbers illustrate:

1. returning iron outside; 2. a coil; 3. a main magnet; 4. a spring magnet; 5. a mover support; 6. an outer support; 7. a handle; 8. a flat bearing; 9. rotating the nut; 10. a displacement sensor; 11. a sensor mounting bracket; 12. returning iron in the stator; 13. a cylinder; 14. a piston; 15. a grommet base; 16. a second connecting stud; 17. a pull pressure sensor; 18. rotating the screw; 19. the first connecting stud.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

It will also be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

As shown in fig. 1, the device for testing the stiffness performance of the magnetic spring of the moving-magnet linear motor according to an embodiment of the present invention is used to test the axial stiffness performance of the magnetic spring of the moving-magnet linear motor, so that the device can be used to measure the axial stiffness of the magnetic spring of the free-piston stirling machine and the linear compressor under laboratory conditions, and provide a basis for ensuring that the magnetic spring has proper axial stiffness. Magnetic spring includes backing ring base 15, stator module and active cell subassembly, stator module is including installing the outer indisputable 1 of stator on backing ring base 15, install on backing ring base 15 and lie in the outer indisputable 1 inboard stator of returning of stator and return indisputable 12, fix coil 2 on the outer indisputable 1 of stator, lie in the stator and return indisputable 12 inboard and with backing ring base 15 interference fit's cylinder 13, active cell group price includes piston 14 with cylinder 13 sliding connection, active cell support 5, main magnet 3 and spring magnet 4, spring magnet 4 is provided with two, two spring magnet 4 are located the axial both sides of main magnet 3 respectively, and main magnet 3 and two spring magnet 4 all install the one end at active cell support 5, this end is located outside the stator and is returned indisputable 12 between indisputable 1 and the stator in, the other end and the piston 14 of active cell support 5 are connected.

Specifically, return iron 1 outside the stator and return iron 12 in the stator respectively with backing ring base 15 threaded connection, coil 2 fixes on iron 1 outside the stator through the mode that bonds, and main magnet 3 and spring magnet 4 all adopt radial magnetization mode, and the opposite direction of magnetizing between them, utilize epoxy glue to be fixed in respectively in active cell support 5, form three annular structure, cylinder 13 can guarantee with backing ring base 15 interference fit that cylinder 13 can not produce any slip condition.

Referring to fig. 1, a device for testing stiffness performance of a magnetic spring of a moving magnet linear motor according to an embodiment of the present invention includes a loading and unloading tool, a tension and pressure sensor 17, and a displacement sensor 10, where the loading and unloading tool includes an outer frame 6 fixed to a stator assembly, and a driving assembly mounted on the outer frame 6 and used for driving a mover assembly to move axially relative to the stator assembly, the driving assembly is connected to the mover assembly through the tension and pressure sensor 17, the tension and pressure sensor 17 is used for measuring stress of the mover assembly in a magnetic field at different positions, the displacement sensor 10 is mounted on the outer frame 6 and used for measuring axial displacement of the mover assembly at different positions, after the initial zero position is set, the assembling and disassembling tool drives the rotor assembly to axially move, and records the values of the tension and pressure sensor 17 and the displacement sensor 10 in real time, the rigidity of the magnetic spring can be obtained according to the values of the tension and pressure sensor 17 and the displacement sensor 10.

Alternatively, the displacement sensor 10 employs a laser displacement sensor.

Optionally, the pull pressure sensor 17 is an S-type external pull pressure sensor.

The device for testing the rigidity performance of the magnetic force spring of the moving magnet type linear motor drives the rotor assembly to axially move through the loading and unloading tool, measures the stress of the rotor assembly at different positions in a magnetic field in real time through the tension pressure sensor 17 connecting the loading and unloading tool and the rotor assembly, measures the axial displacement of the rotor assembly at different positions in real time through the displacement sensor 10, and accordingly obtains the rigidity performance of the magnetic force spring.

Referring to fig. 1, the driving assembly includes a rotary screw 18 in threaded connection with the outer frame 6, one end of a tension and pressure sensor 17 is connected with the rotary screw 18, the other end is connected with the central position of a piston 14 of the mover assembly, the displacement sensor 10 measures the axial displacement of the mover assembly at different positions by measuring the axial displacement of the rotary screw 18, and the linear motion of the mover assembly is converted into the rotary motion by using a transmission mechanism between threads. During operation, the rotor assembly is driven to enter the magnetic field through clockwise rotation or is driven to be away from the magnetic field through anticlockwise rotation, and the operation is simple and effective.

Preferably, the driving assembly further comprises a rotating nut 9 sleeved on the rotating screw 18, the rotating nut 9 is used for driving the rotating screw 18 to rotate, the rotating nut 9 drives the rotating screw 18 to rotate, the contact area can be increased, and the operation is lighter.

In order to further improve the portability of loading and unloading frock, drive assembly still includes the handle 7 of setting on swivel nut 9, drives swivel nut 9 clockwise or anticlockwise rotation through handle 7, can make rotatory screw rod 18 down or upwards to drive the active cell subassembly and get into magnetic field or keep away from magnetic field.

Specifically, four planes are milled on the periphery of the swivel nut 9, and threads with certain depth are tapped for installing the four handles 7, so that the swivel nut 9 can move conveniently.

Preferably, the driving assembly further comprises a plane bearing 8 sleeved on the rotating screw 18, and the plane bearing 8 is arranged between the rotating nut 9 and the outer bracket 6, so that the friction resistance during rotation is reduced, and the installation is more convenient.

Further, a groove (not shown) may be provided at the top of the outer bracket 6, and the flat bearing 8 is fitted in the groove.

Preferably, the rotary screw 18 is integrally made of trapezoidal thread for facilitating mechanical transmission, and the rotary nut 9 is made of brass.

Preferably, the driving assembly further comprises a first connecting stud 19 and a second connecting stud 16, the rotating screw 18 is connected with the pulling and pressing force sensor 17 through the first connecting stud 19, and the pulling and pressing force sensor 17 is connected with the mover assembly through the second connecting stud 16.

Preferably, the outer bracket 6 is fixed in the backing ring base 15 by using a long bolt to pass through the outer return iron 1 of the stator assembly, and the stability of the outer bracket 6 is ensured while the position of the outer return iron 1 is defined.

It should be understood that the driving assembly may also be a driving assembly with other structures, for example, a structure driven by electric power or hydraulic pressure is selected, as long as the purpose of measuring the force applied by the mover assembly at different positions in the magnetic field in real time by pulling the pressure sensor 17 and measuring the axial displacement of the mover assembly at different positions in real time by the displacement sensor 10 can be achieved.

Referring to fig. 1, the testing device further comprises a sensor mounting support 11 for adjusting the relative position of the displacement sensor 10 and the loading and unloading tool, the sensor mounting support 11 comprises a vertical rod, a horizontal rod and an adjusting knob, the horizontal rod is connected with the vertical rod through the adjusting knob, the vertical rod is mounted on the outer support 6, the displacement sensor 10 is arranged at one end, far away from the vertical rod, of the horizontal rod, the structure is simple, and the height of the displacement sensor 10 can be adjusted through the adjusting knob.

Specifically, the displacement sensor 10 is in threaded connection with the cross rod, and the connection mode is simple and reliable.

The test process of the test device of the embodiment of the utility model is as follows:

step S10: the driving assembly is arranged on an outer bracket 6, the loading and unloading tool is fixed on the stator outer return iron 1, the tension and pressure sensor 17 is connected with the rotary bolt and the piston 14, and the position sensor is fixed on the displacement sensor 10. In an initial state, the lower surface a of the rotor bracket 5 is flush with the upper surface of the stator external return iron 1, and the rotor assembly does not enter a magnetic field.

Step S20: the height of the displacement sensor 10 is adjusted by the adjustment knob, and the zero point displacement point is set. The tension and pressure sensor 17 is adjusted and installed to be in an unstressed state, and the stress is 0N at the moment.

Step S30: rotating the handle 7 clockwise drives the rotating nut 9 to rotate clockwise, so that the rotating screw 18 slowly moves downwards, and the rotor assembly is driven into a magnetic field.

Step S40: and recording the values F and X of the tension and pressure sensor 17 and the corresponding displacement sensor 10 in real time, so as to obtain the rigidity of the magnetic spring at each position.

Referring to fig. 2, an embodiment of the present invention further provides a loading and unloading tool, which is used for loading and unloading a rotor assembly in a magnetic spring, and includes an outer bracket 6 fixed on a stator assembly and a driving assembly mounted on the outer bracket 6, where the driving assembly is used for being detachably connected to the rotor assembly and driving the rotor assembly to axially move relative to the stator assembly until the rotor assembly is in a balanced position.

The driving assembly comprises a rotary screw 18 in threaded connection with the outer support 6, one end of the rotary screw 18 extends out of the outer support 6, the other end of the rotary screw is used for being connected with the central position of a piston 14 of the rotor assembly, linear motion of the rotor is converted into rotary motion by utilizing a transmission mechanism between threads, the device is simple and reliable, and the whole rotor assembly can be driven to enter a magnetic field. The small clearance maintained between the cylinder 13 and the piston 14 also plays a role in radial positioning to some extent.

In order to further improve the portability of loading and unloading frock, drive assembly still includes the handle 7 of being connected with swivel nut 9, drives swivel nut 9 clockwise or anticlockwise rotation through handle 7, can make rotatory screw rod 18 down or upwards to drive the active cell subassembly and get into magnetic field or keep away from magnetic field.

Preferably, the rotary screw 18 is integrally provided with trapezoidal threads for facilitating mechanical transmission, and the rotary nut 9 is made of brass.

Preferably, the drive assembly further comprises a first connection stud 19, through which the rotary screw 18 is connected with the mover assembly.

The process of assembling and disassembling the mover assembly by the assembling and disassembling tool of the embodiment of the utility model is as follows:

assembling a rotor assembly:

firstly, the driving assembly is installed on the outer bracket 6, the loading and unloading tool is fixed on the stator outer return iron 1, and the rotary bolt is connected with the piston 14. In an initial state, the lower surface a of the rotor bracket 5 is flush with the upper surface of the stator external return iron 1, and the rotor assembly does not enter a magnetic field.

Then, the handle 7 is rotated clockwise to drive the rotating nut 9 to rotate clockwise, so that the rotating screw 18 slowly moves downwards, and the integral rotor assembly is driven into the magnetic field until the integral rotor assembly is in a balance position.

Disassembling the rotor assembly:

firstly, the driving assembly is installed on the outer bracket 6, the loading and unloading tool is fixed on the stator outer return iron 1, and the rotary bolt is connected with the piston 14.

Then, the handle 7 is rotated counterclockwise, which drives the movable rotating nut 9 to rotate counterclockwise, so that the rotating screw 18 is slowly moved upward, thereby driving the integrated rotor assembly to leave the magnetic field from the equilibrium position until the lower surface a of the rotor bracket 5 is flush with the upper surface b of the outer return iron 1.

The assembling and disassembling tool can effectively assemble and disassemble the rotor assembly in the moving magnet linear motors with various sizes, the assembling and disassembling tool is integrally fixed with the stator assembly through the outer support 6 and is detachably connected with the rotor assembly through the driving assembly, the phenomenon that magnetic blocks jump out in the assembling process or disassembling process can be avoided, assembling and disassembling are more convenient, meanwhile, the driving assembly is used for driving the rotor assembly to move axially, so that the rotor assembly cannot deviate due to repulsion force or suction force generated by a magnetic field in the assembling process, and coaxial assembling of the rotor assembly and the stator assembly is realized.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention, which are made by using the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The device for testing the rigidity performance of the magnetic spring of the moving magnet type linear motor is characterized by comprising a loading and unloading tool, a tension and pressure sensor and a displacement sensor, the assembling and disassembling tool comprises an outer bracket fixed on the stator assembly, and a driving assembly arranged on the outer bracket and used for driving the rotor assembly to move axially relative to the stator assembly, the driving assembly is connected with the rotor assembly through the tension and pressure sensor, the tension and pressure sensor is used for measuring the stress of the rotor assembly at different positions in a magnetic field, the displacement sensor is arranged on the outer support, and is used for measuring the axial displacement of the rotor assembly at different positions, the assembling and disassembling tool drives the rotor assembly to axially move, the tension and pressure sensor measures the stress of the rotor assemblies at different positions in a magnetic field in real time, and the displacement sensor measures the axial displacement of the rotor assemblies at different positions in real time to obtain the rigidity of the magnetic spring.

2. The testing apparatus of claim 1, wherein the driving assembly comprises a rotary screw threadedly coupled to the outer frame, the tension/pressure sensor is coupled to the rotary screw at one end and to a central position of a piston of the mover assembly at the other end, and the displacement sensor measures axial displacement of the mover assembly at different positions by measuring axial displacement of the rotary screw.

3. The testing device of claim 2, wherein the drive assembly further comprises a swivel nut that fits over the swivel screw.

4. The testing device of claim 3, wherein the drive assembly further comprises a handle disposed on the spin nut.

5. The testing device of claim 3, wherein the drive assembly further comprises a flat bearing disposed about the rotating screw, the flat bearing being disposed between the rotating nut and the outer support.

6. The testing device of claim 2, wherein the drive assembly further comprises a first connection stud and a second connection stud, the rotary screw is coupled to the pull and pressure sensor through the first connection stud, and the pull and pressure sensor is coupled to the mover assembly through the second connection stud.

7. The testing device of claim 1, further comprising a sensor mounting bracket for adjusting the relative position of the displacement sensor and the loading and unloading tool, wherein the sensor mounting bracket comprises a vertical rod, a horizontal rod and an adjusting knob, the horizontal rod and the vertical rod are connected through the adjusting knob, the vertical rod is mounted on the outer bracket, and the displacement sensor is arranged at one end of the horizontal rod, which is far away from the vertical rod.

8. The assembling and disassembling tool is used for assembling and disassembling a rotor assembly in a magnetic spring and is characterized by comprising an outer support and a driving assembly, wherein the outer support is used for being fixed on a stator assembly, the driving assembly is installed on the outer support, and the driving assembly is used for being detachably connected with the rotor assembly and driving the rotor assembly to axially move relative to the stator assembly until the rotor assembly is in a balance position.

9. The handling tool of claim 8, wherein the driving assembly comprises a rotary screw threadedly coupled to the outer support, one end of the rotary screw extending out of the outer support and the other end coupled to a center position of a piston of the mover assembly.

10. The handling tool of claim 9, wherein the drive assembly further comprises a swivel nut that fits over the swivel screw and a handle that is disposed on the swivel nut.