阅读说明：本技术 用于直线电机的磁场隔离装置 (Magnetic field isolation device for linear motor ) 是由 梁冉 陈宛 陈福三 于 2021-05-27 设计创作，主要内容包括：本申请涉及直线电机技术领域,公开了一种用于直线电机的磁场隔离装置,基板上安装有直线电机定子；液体槽内设有磁性液体；与直线电机动子连接的传动体浸没于磁性液体内；密封半壳罩于直线电机外,密封半壳未封闭的一侧设有压板组件,压板组件沿传动体的运动方向卡入液体槽内,压板组件的最低位置低于磁性液体的液位；连接板一端固定在基板上,另一端浸入磁性液体内。基板、密封半壳、压板组件、连接板和磁性液体均能导磁,且磁力线能够形成闭合的包络空间,从而起到磁场密封的作用。另外,直线电机动子通过传动体输出动力时克服的始终是其在磁性液体中的流体阻力,直线电机的输出动力不会受限。(The application relates to the technical field of linear motors and discloses a magnetic field isolation device for a linear motor, wherein a linear motor stator is arranged on a substrate; magnetic liquid is arranged in the liquid tank; a transmission body connected with a linear motor rotor is immersed in the magnetic liquid; the sealing half shell is covered outside the linear motor, a pressure plate assembly is arranged on the unsealed side of the sealing half shell, the pressure plate assembly is clamped into the liquid tank along the movement direction of the transmission body, and the lowest position of the pressure plate assembly is lower than the liquid level of the magnetic liquid; one end of the connecting plate is fixed on the base plate, and the other end of the connecting plate is immersed in the magnetic liquid. The substrate, the sealed half shell, the pressing plate assembly, the connecting plate and the magnetic liquid can conduct magnetism, and magnetic lines of force can form a closed enveloping space, so that the magnetic field sealing effect is achieved. In addition, the fluid resistance of the linear motor mover in the magnetic liquid is always overcome when the linear motor mover outputs power through the transmission body, and the output power of the linear motor is not limited.)

1. A magnetic field isolation apparatus for a linear motor, comprising:

the linear motor comprises a base plate, a stator and a motor, wherein the base plate is provided with a linear motor stator through a base;

the liquid tank is internally provided with magnetic liquid;

the transmission body is connected with the linear motor rotor and is immersed in the magnetic liquid;

the sealing half shell is covered outside the linear motor, a pressure plate assembly is arranged on the unsealed side of the sealing half shell, the pressure plate assembly is clamped into the liquid tank along the movement direction of the transmission body, and the lowest position of the pressure plate assembly is lower than the liquid level of the magnetic liquid;

one end of the connecting plate is fixed on the base plate, and the other end of the connecting plate is immersed in the magnetic liquid;

the base plate, the sealing half shell, the pressing plate assembly and the connecting plate are all made of magnetic materials.

2. The magnetic field isolation device for a linear motor according to claim 1, wherein the hermetic half shell comprises a top plate disposed on a top surface thereof and a plurality of side plates disposed on side surfaces thereof, the side surfaces of the hermetic half shell part are not provided with the side plates to form the unsealed side, the pressure plate assembly is fixedly connected to the unsealed side through a magnetic sealing gasket and the top plate and the side plates, and the magnetic sealing gasket is a flexible material filled with magnetic conductive material particles.

3. The magnetic field isolation device for the linear motor according to claim 1 or 2, wherein the pressing plate assembly comprises a trapezoidal plate and a first pressing plate and a second pressing plate symmetrically arranged on two sides of the trapezoidal plate, the first pressing plate and the second pressing plate are connected together through the trapezoidal plate, the first pressing plate is provided with a first V-shaped groove, the second pressing plate is provided with a second V-shaped groove symmetrical to the first V-shaped groove, and two sides of the trapezoidal plate are respectively matched with the first V-shaped groove and the second V-shaped groove.

4. The magnetic field isolation apparatus for a linear motor according to claim 3, wherein the first pressing plate has a first positioning pin at a lower end thereof, first press plates are provided at both sides thereof, a second positioning pin is provided at a lower end thereof, second press plates are provided at both sides thereof, the first positioning pin and the second positioning pin are engaged with the liquid tank, and the first press plates and the second press plates are inclined downward in an inverted V shape and extend in a lateral direction to be immersed in the magnetic liquid.

5. The magnetic field isolation device for the linear motor according to claim 1, wherein the magnetic fluid comprises a magnetic conductive material, a base carrier fluid and a dispersing agent, and the magnetic conductive material is made of Fe with the diameter of 5nm-100nm₃O₄The base carrier liquid is kerosene, engine oil, silicone oil or ester liquid.

6. The magnetic field isolation device for the linear motor according to claim 1, wherein the inner side of the bottom wall of the liquid tank is provided with a V-shaped structure formed by two symmetrical inclined planes, the included angle α between the inclined planes and the vertical direction is less than 90 °, a pipeline is arranged at the position of the side wall of the liquid tank close to the bottom wall, and a valve for controlling the on-off of the pipeline is arranged on the pipeline.

7. The magnetic field isolation device for the linear motor according to claim 1, wherein the transmission body comprises a first mounting flange, a V-shaped beam, a torpedo body and a second mounting flange, wherein both ends of the V-shaped beam and the torpedo body are streamlined, and the transmission body is fixedly connected with the rotor of the linear motor by mounting the first flange.

8. The magnetic field isolation device for a linear motor according to claim 1, wherein a liquid level sensor for detecting a liquid level is provided in the magnetic liquid, and the liquid level sensor gives an alarm when the connection plate and the pressure plate assembly are not immersed in the magnetic liquid.

9. The magnetic field isolation apparatus for a linear motor according to claim 8, wherein the number of the level sensors is 3-5, the arrangement direction is uniformly distributed along the movement direction of the transmission body, the installation position of the level sensors is on the liquid tank, the connection plate, and/or the pressure plate assembly, and the installation position does not affect the movement of the transmission body.

10. The magnetic field isolation apparatus for a linear motor according to claim 4, wherein the first pressure plate, the second pressure plate and the trapezoidal plate are connected by a screw nut.

Technical Field

The invention relates to the technical field of linear motors, in particular to a magnetic field isolation device for a linear motor.

Background

The linear motor has the advantages of high precision, high acceleration speed and the like, but the stator and the rotor of the linear motor are exposed in the air, so that the magnetic field of the linear motor can be diffused to the surrounding environment to a certain extent, and the linear motor is limited to be used in the field with high requirement on the cleanliness of the environmental magnetic field. In order to prevent the magnetic field of the linear motor from being dispersed into the air, an isolation device made of a magnetic conductive material is required to surround the linear motor. When a rotor of the linear motor moves linearly along a stator, the conventional isolating device prevents the linear motor from transmitting power outwards, and the magnetic field sealing effect is poor.

Disclosure of Invention

In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a magnetic field isolation apparatus for a linear motor.

The present invention provides a magnetic field isolation device for a linear motor, comprising: the linear motor comprises a base plate, a stator and a motor, wherein the base plate is provided with a linear motor stator through a base; the liquid tank is internally provided with magnetic liquid; the transmission body is connected with the linear motor rotor and is immersed in the magnetic liquid; the sealing half shell is covered outside the linear motor, a pressure plate assembly is arranged on the unsealed side of the sealing half shell, the pressure plate assembly is clamped into the liquid tank along the movement direction of the transmission body, and the lowest position of the pressure plate assembly is lower than the liquid level of the magnetic liquid; one end of the connecting plate is fixed on the base plate, and the other end of the connecting plate is immersed in the magnetic liquid; the base plate, the sealing half shell, the pressing plate assembly and the connecting plate are all made of magnetic materials.

In one embodiment, the sealed half shell comprises a top plate arranged on the top surface of the sealed half shell and a plurality of side plates arranged on the side surfaces of the sealed half shell, the side plates are not arranged on the side surfaces of the sealed half shell part to form the unsealed side, the pressure plate assembly is fixedly connected to the unsealed side through a magnetic sealing gasket and the top plate and the side plates, and the magnetic sealing gasket is made of a flexible material filled with magnetic conductive material particles.

In one embodiment, the pressing plate assembly comprises a trapezoidal plate, and a first pressing plate and a second pressing plate which are symmetrically arranged on two sides of the trapezoidal plate, wherein the first pressing plate and the second pressing plate are connected together through the trapezoidal plate, the first pressing plate is provided with a first V-shaped groove, the second pressing plate is provided with a second V-shaped groove which is symmetrical to the first V-shaped groove, and two sides of the trapezoidal plate are respectively matched with the first V-shaped groove and the second V-shaped groove.

In one embodiment, the first pressing plate is provided with a first positioning pin at the lower end thereof, first pressing plates are arranged on two sides of the first pressing plate, a second positioning pin is arranged on the lower end of the second pressing plate, second pressing plates are arranged on two sides of the second pressing plate, the first positioning pin and the second positioning pin are clamped on the liquid tank, and the first pressing plates and the second pressing plates are inclined downwards in an inverted V shape and extend transversely to be immersed in the magnetic liquid.

In one embodiment, the magnetic liquid comprises a magnetic conductive material, a base carrier liquid and a dispersing agent, wherein the magnetic conductive material is made of Fe with the diameter of 5nm-100nm₃O₄The base carrier liquid is kerosene, engine oil, silicone oil or ester liquid.

In one embodiment, the inner side of the bottom wall of the liquid tank is provided with a V-shaped structure formed by two symmetrical inclined planes, an included angle alpha between each inclined plane and the vertical direction is smaller than 90 degrees, a pipeline is arranged at a position, close to the bottom wall, of the side wall of the liquid tank, and a valve for controlling the on-off of the pipeline is arranged on the pipeline.

In one embodiment, the transmission body comprises a first mounting flange, a V-shaped beam, a torpedo body and a second mounting flange, wherein both ends of the V-shaped beam and the torpedo body are streamlined, and the transmission body is fixedly connected with the linear motor rotor by mounting the first flange.

In one embodiment, a liquid level sensor for detecting the liquid level is arranged in the magnetic liquid, and the liquid level sensor gives an alarm when the connecting plate and the pressing plate assembly are not immersed in the magnetic liquid.

In one embodiment, the number of the liquid level sensors is 3-5, the arrangement directions are evenly distributed along the movement direction of the transmission body, the installation positions of the liquid level sensors are arranged on the liquid tank, the connecting plate and/or the pressure plate assembly, and the installation positions do not influence the movement of the transmission body.

In one embodiment, the first pressure plate, the second pressure plate and the trapezoidal plate are connected through screws and nuts.

Compared with the prior art, the invention has the beneficial effects that:

the scheme provides a magnetic field isolation device for a linear motor, wherein a linear motor stator is arranged on a substrate through a base; magnetic liquid is arranged in the liquid tank; a transmission body connected with a linear motor rotor is immersed in the magnetic liquid; the sealing half shell is covered outside the linear motor, a pressure plate assembly is arranged on the unsealed side of the sealing half shell, the pressure plate assembly is clamped into the liquid tank along the movement direction of the transmission body, and the lowest position of the pressure plate assembly is lower than the liquid level of the magnetic liquid; one end of the connecting plate is fixed on the base plate, and the other end of the connecting plate is immersed in the magnetic liquid. The base plate, sealed half shell, clamp plate subassembly, connecting plate and magnetic fluid homoenergetic lead magnetic, so the magnetic line of force can form closed envelope space in base plate, clamp plate subassembly, magnetic fluid, sealed half shell and connecting plate, consequently outside envelope space can not revealed in the magnetic field of linear electric motor stator and active cell, thereby play the effect that the magnetic field is sealed, guaranteed the integrality of closed magnetic circuit. In addition, the fluid resistance of the linear motor mover in the magnetic liquid is always overcome when the linear motor mover outputs power through the transmission body, and the output power of the linear motor is not limited.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 is a schematic structural diagram illustrating a magnetic field isolation device for a linear motor according to an embodiment of the present application;

fig. 2 is an assembly view of a linear motor and a substrate according to an embodiment of the present invention;

fig. 3 is a perspective view showing a transmission body according to an embodiment of the present application;

FIG. 4 illustrates a schematic structural diagram of a platen assembly according to an embodiment of the present application;

FIG. 5 illustrates a side view of a first platen in accordance with embodiments of the present application;

FIG. 6 illustrates an assembly view of a platen assembly and liquid bath in accordance with embodiments of the present application;

fig. 7 is a perspective view of a seal housing half according to an embodiment of the present invention.

In the figure: 1-base plate, 2-base, 3-linear motor stator, 4-linear motor rotor, 5-transmission body, 51-first mounting flange, 52-V-shaped beam, 53-torpedo body, 54-second mounting flange, 6-first pressure plate, 61-first V-shaped groove, 62-first pressure wave plate, 63-first positioning pin, 7-second pressure plate, 71-second V-shaped groove, 72-second pressure wave plate, 73-second positioning pin, 8-trapezoidal plate, 9-liquid groove, 91-pin groove, 10-magnetic liquid, 11-pipeline, 12-sealed half shell, 121-first side plate, 122-top plate, 123-second side plate, 124-flange, 13-magnetic sealing gasket and 14-connecting plate.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

To prevent the magnetic field of the linear motor from spreading into the air, a sealed enclosure of magnetically conductive material may be used to enclose the linear motor. At present, the sealing cover of the linear motor is usually an organ cover which is made of steel plates, has gradually increasing cross-sectional sizes from small to large and is nested with each other, and the organ cover is used as the sealing cover to cover the linear motor. Because all the sections of the organ cover are sequentially nested, the linear motor rotor can drive all the sections of the organ cover to move when moving, and power output is realized.

The main problems with the use of steel sheet organ covers are: the bottom of the side face of the steel plate organ cover and the surface of the equipment base are difficult to seal, otherwise, sliding friction exists between the steel plate organ cover and the equipment base, and the steel plate organ cover cannot fully seal the linear motor due to the existence of the gap; mechanical gaps are inevitably formed among the sections of the steel plate organ covers which are sequentially nested, and the gaps are larger and larger along with the use of the organ covers, so that the degree of magnetic field leakage is also increased; the steel plate organ cover is used for controlling weight, so that the thickness of the steel plate of the organ cover is limited, the area of a magnetic circuit is limited, and the sealing effect of the magnetic field is poor; the steel plate organ cover is heavy, so that the load of the linear motor is increased; in addition, since the sizes of the steel plate organ covers are sequentially increased, the mass of the organ covers required to be borne when the linear motor moves to different positions is also different, and thus the dynamic performance of the linear motor is adversely affected.

In order to ensure the magnetic field sealing effect and reduce or eliminate the obstruction of the outward power transmission of the linear motor, the application provides a magnetic field isolation device for the linear motor. Fig. 1 to 7 illustrate a magnetic field isolation apparatus for a linear motor provided by the present application.

As shown in fig. 1, a magnetic field isolation apparatus for a linear motor includes: the motor comprises a substrate 1, wherein a linear motor stator is arranged on the substrate 1 through a base 2; a liquid tank 9, wherein a magnetic liquid 10 is arranged in the liquid tank 9; the transmission body 5 is connected with the linear motor rotor, and the transmission body 5 is immersed in the magnetic liquid 10; a sealing half shell 12, wherein the sealing half shell 12 covers the outside of the linear motor, a pressure plate assembly is arranged on the unsealed side of the sealing half shell 12, the pressure plate assembly is clamped into the liquid tank 9 along the movement direction of the transmission body 5, and the lowest position of the pressure plate assembly is lower than the liquid level of the magnetic liquid 10; one end of the connecting plate 14 is fixed on the substrate 1, and the other end of the connecting plate 14 is immersed in the magnetic liquid 10; the base plate 1, the sealing half shell 12, the pressure plate assembly and the connecting plate 14 are all made of magnetic conductive materials.

The substrate 1 is made of a magnetic conductive material, and may be made of pure iron or steel with low carbon content and low alloy element content. As shown in fig. 2, a base 2 is provided on a substrate 1, and a linear motor stator 3 is mounted on the base 2. The linear motor mover 4 is a member that engages with the linear motor stator 3. When the linear motor rotor 4 moves under the action of the linear motor stator 3, the linear motor rotor 4 drives the transmission body 5 to move in the magnetic liquid 10.

According to the common sense of mechanical design, a linear guide rail which is matched with the linear motor stator 3 and the linear motor rotor 4 and has the same direction with the linear motor stator 3 and a sliding block which moves on the guide rail are also needed. Since these components are part of the motion mechanism, they are not the core content of the magnetic field seal of the linear motor related to the present application, and belong to the common general knowledge in the mechanical field, and therefore, they will not be described again.

As shown in fig. 3, the transmission body 5 may include a first mounting flange 51, a V-shaped beam 52, a torpedo body 53, and a second mounting flange 54, wherein both ends of the V-shaped beam 52 and the torpedo body 53 are streamlined, and the transmission body 5 is fixedly connected to the linear motor mover 4 through the first mounting flange 51. The transmission body 5 does not require a magnetic conductive material, and various metal and non-metal materials meeting the mechanical requirements related to transmission can be used.

The power of the linear motor mover 4 is output through the second mounting flange 54 of the transmission body 5. Since the V-shaped beam 52 and torpedo body 53 of the transmission body 5 are in streamline shapes, the resistance of the transmission body 5 moving in the magnetic liquid 10 can be reduced.

The magnetic liquid 10 comprises a magnetic conductive material, a base carrier liquid and a dispersing agent, wherein the magnetic conductive material is made of Fe with the diameter of 5nm-100nm₃O₄The base carrier liquid is kerosene, engine oil, silicone oil or ester liquid. Namely, magnetic conductive materials are doped into kerosene, engine oil, silicone oil or ester liquid. The magnetic liquid 10 also contains a dispersant, which is used for preventing the magnetic conductive material from agglomerating.

As shown in fig. 4 and 5, the pressing plate assembly may include a trapezoidal plate 8, and a first pressing plate 6 and a second pressing plate 7 symmetrically disposed at two sides of the trapezoidal plate 8, wherein the first pressing plate 6 and the second pressing plate 7 are connected together through the trapezoidal plate 8, the first pressing plate 6 is provided with a first V-shaped groove 61, the second pressing plate 7 is provided with a second V-shaped groove 71 symmetrical to the first V-shaped groove 61, and two sides of the trapezoidal plate 8 are respectively matched with the first V-shaped groove 61 and the second V-shaped groove 71.

As shown in fig. 6, the first pressing plate 6 has a first positioning pin 63 at a lower end thereof, first press plates 62 at two sides thereof, a second positioning pin 73 at a lower end of the second pressing plate 7, second press plates 72 at two sides thereof, the first positioning pin and the second positioning pin are clamped on the liquid tank 9, and the first press plates 62 and the second press plates 72 are inclined downward in an inverted V shape and extend in a transverse direction to be immersed in the magnetic liquid 10.

Since the first pressing plate 6 and the second pressing plate 7 are symmetrical left and right, the first press plates 62 and the first positioning pins 63 have the same shape and number as the second press plates 72 and the second positioning pins 73. The number of the first press plates 62 and the second press plates 72 may be 1, and may also be 2 or more.

First clamp plate 6, second clamp plate 7, trapezoidal plate 8 all are the magnetic material preparation, preferred pure iron, and first clamp plate 6, second clamp plate 7, trapezoidal plate 8 accessible screw nut connect, avoid the soft, the not adaptable problem of tapping of pure iron material.

The first positioning pins 63 of the first presser plate 6 and the second positioning pins 73 of the second presser plate 7 are engaged in the pin grooves 91 on the left and right sides of the liquid tank 9. Because the first pressing plate 6 and the second pressing plate 7 are connected through the trapezoidal plate 8, the first pressing plate 6, the second pressing plate 7 and the trapezoidal plate 8 can be stabilized on the liquid tank 9 through the weight action of the first pressing plate 6, the second pressing plate 7 and the trapezoidal plate 8.

When the trapezoidal plate 8 is adjusted in position in the height direction, the widths of the first pressing plate 6 and the second pressing plate 7 can be adjusted, so that the pressing plate assembly can be clamped into the liquid tank 9 in the moving direction of the transmission body 5, and the first pressing plate 62 and the second pressing plate 72 can be clamped into the inner surface of the liquid tank 9 in the direction perpendicular to the moving direction, thereby eliminating the gap between the first pressing plate 6, the second pressing plate 7 and the liquid tank 9.

The first press wave plate 62 of the first press plate 6 and the second press wave plate 72 of the second press plate 7 are immersed in the magnetic liquid 10 to form a closed magnetic path, and can alleviate the fluctuation of the magnetic liquid 10 caused by the movement of the transmission body 5 in the magnetic liquid 10.

Sealed half shell 12 can be including locating the roof of its top surface and locating a plurality of curb plates of its side, a plurality of curb plates connect in the roof with between the base plate 1, sealed half shell 12 part side does not set up the curb plate forms not confined one side, the clamp plate subassembly pass through magnetic seal pad 13 with roof and curb plate link firmly in not confined one side, magnetic seal pad 13 is the flexible material of inside packing magnetic material granule. The magnetic gasket 13 may be a magnetic rubber gasket.

As shown in fig. 7, the side plates include a first side plate 121, a second side plate 123, and a top plate 122. The sealed half-shell 12 is made of a magnetic conductive material, and the first side plate 121, the top plate 122, and the second side plate 123 may be mechanically manufactured as a whole, and may also be fixedly connected to each other by a flange 124, and the fixing connection mode is various mechanical connection modes adapted to the magnetic conductive material of the sealed half-shell 12. For example, when the first side plate 121, the top plate 122, and the second side plate 123 are made of electrical pure iron, the first side plate 121, the top plate 122, the second side plate 123, and the flange 124 may be connected by screws and nuts.

The liquid groove 9 is characterized in that the inner side of the bottom wall is provided with a V-shaped structure formed by two symmetrical inclined planes, the included angle alpha between each inclined plane and the vertical direction is smaller than 90 degrees, a pipeline 11 is arranged at the position, close to the bottom wall, of the side wall of the liquid groove 9, and when the magnetic liquid 10 in the liquid groove 9 needs to be discharged, the magnetic liquid 10 can gather to the central position of the bottom of the liquid groove 9 and flow out through the pipeline 11. Meanwhile, the pipe 11 can be used for injecting the magnetic liquid 10 into the liquid tank 9. And a valve for controlling the on-off of the pipeline 11 is arranged on the pipeline 11. The material of the liquid tank 9 and the pipe 11 does not necessarily require the use of a magnetic conductive material.

A liquid level sensor for detecting liquid level is arranged in the magnetic liquid, and when the connecting plate 14 and the pressing plate assembly are not immersed in the magnetic liquid, the liquid level sensor gives an alarm. The number of the liquid level sensors can be 3-5, the arrangement directions are uniformly distributed along the movement direction of the transmission body 5, the installation positions of the liquid level sensors are arranged on the liquid tank 9, the connecting plate 14 and/or the pressure plate assembly, and the installation positions do not influence the movement of the transmission body 5.

The liquid level sensor is used for detecting the liquid level of the magnetic liquid 10 in the liquid tank 9, when the local liquid level or the whole liquid level of the magnetic liquid 10 is too low, an alarm prompt is given when the connecting plate 14, the trapezoidal plate 8, the first pressing plate 6 and the second pressing plate 7 are not immersed in the magnetic liquid 10, the magnetic liquid 10 is supplemented through the pipeline 11, or the motion of the linear motor rotor 4 is stopped temporarily.

Because the connecting plate 14 and the sealed half-shell 12 are fixedly connected with the base plate 1, the sealed half-shell 12 is pressed on the first pressing plate 6 and the second pressing plate 7 through the magnetic sealing gasket 13, the first pressing plate 6, the second pressing plate 7 and the connecting plate 14 are all immersed in the magnetic liquid 10, and the base plate 1, the first pressing plate 6, the second pressing plate 7, the trapezoidal plate 8, the magnetic liquid 10, the sealed half shell 12 and the magnetic sealing gasket 13 can conduct magnetism, so that magnetic lines of force can form a closed loop in the base plate 1, the first pressing plate 6, the second pressing plate 7, the trapezoidal plate 8, the magnetic liquid 10, the sealed half shell 12, the magnetic sealing gasket 13 and the connecting plate 14, therefore, the magnetic fields of the linear motor stator 3 and the linear motor rotor 4 cannot leak out of the space enveloped by the substrate 1, the first pressing plate 6, the second pressing plate 7, the trapezoidal plate 8, the sealing half shell 12, the magnetic sealing gasket 13 and the connecting plate 14, and the magnetic field sealing effect is achieved.

Compared with the advantage of a steel plate organ cover, the connecting plate 14, the magnetic sealing gasket 13, the sealing half shell 12, the trapezoidal plate 8, the first pressing plate 6 and the second pressing plate 7 do not move along with the linear motor rotor 4 due to the fact that the connecting plate, the magnetic sealing gasket 13, the sealing half shell 12, the trapezoidal plate 8, the first pressing plate 6 and the second pressing plate 7 belong to fixed parts, the thicknesses of the connecting plate 14, the magnetic sealing gasket 13, the sealing half shell 12, the trapezoidal plate 8, the first pressing plate 6 and the second pressing plate 7 are not limited by output power of the linear motor, the magnetic flux area of the parts can be increased, and the magnetic field isolation effect is guaranteed. Secondly, when the linear motor mover 4 outputs power through the transmission body 5, the fluid resistance of the transmission body 5 in the magnetic liquid 10 is always overcome if the friction of the linear guide rail and the slide block thereof used in cooperation with the linear motor is not counted, so that the dynamic property of the linear motor is favorable.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the disclosure. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.