CN115489476A

CN115489476A - Electromagnetic jacking device and front structure of whole vehicle

Info

Publication number: CN115489476A
Application number: CN202211225002.1A
Authority: CN
Inventors: 朱付臻; 邬达文; 王亚骞; 董如昇
Original assignee: Ningbo Junsheng Automobile Safety System Co ltd
Current assignee: Ningbo Junsheng Automobile Safety System Co ltd
Priority date: 2022-10-09
Filing date: 2022-10-09
Publication date: 2022-12-20

Abstract

The application provides an electromagnetic jacking device and a front structure of a whole automobile, which are applied to the technical field of automobile safety and comprise an outer shell, a piston, an electromagnetic actuating assembly and a power supply assembly; the electromagnetic actuating assembly comprises a first guide rail, a second guide rail and an armature, the first guide rail is electrically connected with the positive pole of the power supply assembly, the second guide rail is electrically connected with the negative pole of the power supply assembly, and the armature is arranged on the first guide rail and the second guide rail; the lower end of the piston is abutted against the upper end of the armature, and the upper end of the piston faces the opening of the outer shell; when the power supply assembly is electrified, a closed circuit is formed among the power supply, the first guide rail, the armature and the second guide rail, and under the action of Lorentz force, the armature bounces upwards to push the piston and push the upper end of the piston out of the opening of the outer shell. The jacking force can be stably output in the armature jacking process; and the electric energy is mainly consumed, the disposable consumables such as gunpowder are not depended on, the potential safety hazard during transportation and storage is greatly reduced, the device can be repeatedly used, the whole structure is simple, and the later maintenance is facilitated.

Description

Electromagnetic jacking device and front structure of whole vehicle

Technical Field

The application relates to the technical field of automobile safety, in particular to an electromagnetic jacking device and a whole automobile front structure.

Background

In order to better protect the vulnerable group in the collision accident, when the automobile collides with the vulnerable group on the road, the rear end of the engine hood is lifted, the gap between the engine hood and the rigid structure in the engine compartment is increased, and the impact kinetic energy generated by the collision is absorbed, so that the damage to the vulnerable group is reduced.

Because the collision duration is extremely short, the engine hood needs to be lifted at an extremely fast speed to effectively protect the vulnerable groups, and the lifting of the engine hood is mainly realized by a pyrotechnic lifter at present. However, because the pyrotechnic jack needs to be jacked by igniting gunpowder, the following disadvantages exist: 1. gunpowder is easy to trigger point explosion in the transportation and storage processes, and potential safety hazards exist; 2. the explosive detonation process is not easy to control, so that the jacking force is unstable; 3. the existing firework type jacking device can not be repeatedly used, and once the firework type jacking device is touched by mistake, higher maintenance cost can be realized.

Therefore, a new electromagnetic jacking device is needed, which can reduce the potential safety hazard during transportation and storage, and can stably output jacking force and be reused.

Disclosure of Invention

In view of this, the embodiments of the present disclosure provide an electromagnetic jacking device and a front structure of a whole vehicle, which can reduce potential safety hazards during transportation and storage, and can stably output jacking force and be reused.

The embodiment of the specification provides the following technical scheme:

the embodiment of the specification provides an electromagnetic jacking device which comprises an outer shell, a piston, an electromagnetic actuating assembly and a power supply assembly connected to the outer shell;

the electromagnetic actuating assembly comprises a first guide rail, a second guide rail and an armature, the first guide rail is fixed in the outer shell and is electrically connected with a positive pole of the power supply assembly, the second guide rail is fixed in the outer shell and is electrically connected with a negative pole of the power supply assembly, and the armature is arranged on the first guide rail and the second guide rail;

the piston is at least partially arranged in the outer shell, the lower end of the piston abuts against the upper end of the armature, and the upper end of the piston faces to the opening of the outer shell;

when the power supply assembly is electrified, a closed circuit is formed among the power supply, the first guide rail, the armature and the second guide rail, and under the action of Lorentz force, the armature bounces upwards along the first guide rail and the second guide rail to push the piston, so that the upper end of the piston is pushed out from the opening of the outer shell.

Through the technical scheme, a closed circuit is formed among the first guide rail, the second guide rail, the armature and the power supply assembly, when the power supply assembly is electrified, the armature can be pushed by Lorentz force, so that the armature is upwards bounced and pushes the piston, and the jacking force can be stably output in the whole process; and the electric energy is mainly consumed, the disposable consumables such as gunpowder are not depended on, on one hand, the potential safety hazard during transportation and storage is greatly reduced, on the other hand, the electric energy storage box can be reused, the whole structure is simple, and the later maintenance is facilitated.

Preferably, the outer casing is a tubular structure, the power supply module is at least partially nested inside one end of the tubular structure, and has a mounting surface facing the other end of the tubular structure, the first guide rail and the second guide rail are arc-shaped upright arm structures and are symmetrically fixed on the mounting surface, respectively, and the armature contour is matched with the inner surface of the first guide rail and the inner surface of the second guide rail.

Through the technical scheme, the first guide rail and the second guide rail are directly and fixedly connected with the power supply assembly through the mounting surfaces, on one hand, the first guide rail and the second guide rail can be mounted on the power supply assembly in advance outside the outer shell, operation is convenient, and assembly difficulty is reduced; on the other hand, the first guide rail and the second guide rail are fixed to the power supply module before being installed in the outer casing, so that the relative position between the first guide rail and the second guide rail can be adjusted, the overall installation accuracy can be ensured, and the reliability can be improved.

Preferably, the outer shell comprises a mounting section, a leading-out section and a transition section between the mounting section and the leading-out section, which are coaxially arranged, and the pipe diameter of the mounting section is larger than that of the leading-out section;

the mounting surface is arranged in the mounting section, the mounting surface is provided with a first arc groove and a second arc groove, one end of the first guide rail is embedded in the first arc groove, the other end of the first guide rail at least partially abuts against the inner surface of the transition section, one end of the second guide rail is embedded in the second arc groove, and the other end of the second guide rail at least partially abuts against the inner surface of the transition section.

Through above-mentioned technical scheme, rely on power supply module and changeover portion to carry on spacingly respectively to the axial both ends of first guide rail and second guide rail, the relative shell body of power supply module is fixed the back, and the axial position of first guide rail and second guide rail is by the complete restriction promptly, need not to add extra step again and fixes first guide rail and second guide rail, consequently very big reduction the assembly degree of difficulty of whole electromagnetism jacking ware.

Preferably, the axial cross sections of the first guide rail and the second guide rail are circular arc-shaped;

the armature is of a hollow convex block structure and comprises an annular vertical arm and a dome closed structure located at one end of the annular vertical arm, two ends of the outer surface of the annular vertical arm are respectively attached to the inner surface of the first guide rail and the inner surface of the second guide rail, and the dome closed structure is abutted to the lower end of the piston.

Preferably, the outer diameter of the annular vertical arm is smaller than or equal to the pipe diameter of the leading-out section.

Through the technical scheme, the contact between the armature bouncing process and the inner wall of the lead-out section can be reduced, the external force loss generated when the armature pushes the piston is reduced, and the ejection efficiency of the piston is improved.

Preferably, an insulating pad is further arranged in the outer shell to block direct contact between the first guide rail and the second guide rail and between the leading-out section and the transition section.

Through above-mentioned technical scheme, set up insulating pad, carry out the separation to first guide rail and second guide rail, reduce outside electromagnetic interference, improve the holistic reliability of electromagnetism jacking ware.

Preferably, the piston comprises a piston head and a piston rod which are coaxially arranged, and a bushing is arranged in the leading-out section;

the lower end of the piston head is abutted against the upper end of the armature, the piston rod is positioned at the upper end of the piston head and is coaxially connected with the inner hole of the bushing, and the inner ring of the bushing is used for limiting the piston rod to jump in the radial direction;

the inner ring diameter of the bushing is smaller than the outer diameter of the piston head for limiting the piston head from disengaging from the interior of the outer housing.

Through the technical scheme, the bushing is arranged to limit the piston rod and limit the piston head to be separated, so that the piston rod can be ensured to be ejected out along a given route without deviation on one hand; on the other hand, the piston head can be limited through the bushing, the possibility that the whole piston is ejected out is reduced, and the maintenance after the use is facilitated.

Preferably, a rubber plug is arranged at the upper end of the outer shell and used for plugging an opening of the outer shell;

when the armature slides upwards under the action of Lorentz force, the piston moves upwards to push the rubber plug away from the upper end opening of the outer shell.

Preferably, a seal ring is provided between an outer periphery of the power module and an inner periphery of the outer case.

The embodiment of the specification further provides a whole vehicle front structure, which comprises an engine hood and an engine cabin and is characterized in that any one of the electromagnetic lifters is arranged between the engine hood and the engine cabin.

Through above-mentioned technical scheme, reduce the potential safety hazard when transporting and storing, output jacking force and used repeatedly that simultaneously can be stable.

Compared with the prior art, the beneficial effects that can be achieved by the at least one technical scheme adopted by the embodiment of the specification at least comprise:

1. when the power supply assembly is electrified, a closed circuit is formed among the first guide rail, the second guide rail, the armature and the power supply assembly to generate Lorentz force, and under the action of the Lorentz force, the armature is upwards bounced to push the piston, so that the jacking force can be stably output in the whole process;

2. when the piston is lifted upwards, the piston depends on Lorentz force, mainly consumes electric energy and does not depend on disposable consumables such as gunpowder and the like, so that the potential safety hazard during transportation and storage is greatly reduced, and the piston can be reused;

3. through the electromagnetism jacking ware that shell body, first guide rail, second guide rail, armature and piston formed, overall structure is simple, is favorable to the later maintenance.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic sectional view of the overall structure of an electromagnetic jack in the present embodiment;

fig. 2 is an exploded schematic view of the electromagnetic jack in the present embodiment;

fig. 3 is a schematic diagram of the entire vehicle front structure in the present embodiment.

Description of the drawings: 1. an outer housing; 101. an installation section; 102. a transition section; 103. a lead-out section; 2. a piston; 201. a piston head; 202. a piston rod; 3. an electromagnetic actuating assembly; 301. a first guide rail; 302. a second guide rail; 303. an armature; 3031. an annular vertical arm; 3032. a dome closure structure; 4. a power supply component; 5. a seal ring; 6. a mounting surface; 7. a first arc groove; 8. a second arc groove; 9. an insulating pad; 10. a bushing; 11. a rubber plug; 12. an engine cover; 13. an engine compartment; 14. a sensor; 15. a controller; 16. a hinge system; 17. a support; 18. and (4) a storage battery.

Detailed Description

The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The application is capable of other and different embodiments and its several details are capable of modifications and various changes in detail without departing from the spirit of the application. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number and aspects set forth herein. In addition, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to or other than one or more of the aspects set forth herein.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present application, and the drawings only show the components related to the present application rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.

In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details.

The inventor finds that the jacking device in the prior art mainly depends on the ignition explosive to realize jacking. But the jacking device for realizing jacking by means of igniting gunpowder has the following defects: 1. gunpowder is easy to trigger point explosion in the transportation and storage processes, and potential safety hazards exist; 2. the explosive detonation process is not easy to control, so that the jacking force is unstable; 3. the existing firework type jacking device can not be repeatedly used, and once the firework type jacking device is touched by mistake, higher maintenance cost can be achieved.

In view of this, an embodiment of the present specification provides an electromagnetic lifter, which, with reference to fig. 1, includes an outer casing 1, a power supply assembly 4, a first guide rail 301, a second guide rail 302, an armature 303, and a piston 2, and when the power supply assembly 4 is powered on, a closed circuit is formed between the first guide rail 301, the second guide rail 302, the armature 303, and the power supply assembly 4, so as to generate a lorentz force, push the armature 303 to lift upward, and push the piston 2 to realize lifting. Compare in the mode that the jacking was realized to the ignition powder, the jacking force of output is changeed control and more stable, and owing to avoided the use of gunpowder, consequently also reduced the potential safety hazard, also can realize used repeatedly.

The technical solutions provided by the embodiments of the present application are described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, an embodiment of the present specification provides an electromagnetic lifter. Comprising an outer housing 1, a piston 2, an electromagnetic actuating assembly 3 and a power supply assembly 4.

The outer casing 1 is a tubular structure, and the outer casing 1 comprises a mounting section 101, a leading-out section 103 and a transition section 102 between the mounting section 101 and the leading-out section 103 which are coaxially arranged. The pipe diameter of erection section 101 is greater than the pipe diameter of derivation section 103, and erection section 101 is located the lower extreme of derivation section 103.

The power supply module 4 is cylindrical as a whole, the upper end of the power supply module 4 is coaxially nested in the installation section 101, the lower end protrudes out of the lower end of the installation section 101, the outer periphery of the power supply module 4 is fixedly connected with the inner periphery of the installation section 101 through press riveting, a sealing ring 5 is coaxially installed between the outer periphery of the power supply module 4 and the inner periphery of the installation section 101 to realize sealing, and in the embodiment, the specific type of the sealing ring 5 is an O-ring.

In other embodiments, the power module 4 may be entirely embedded in the mounting section 101, and the seal ring 5 may be a U-ring, a V-ring, or the like.

The electromagnetic actuating assembly 3 comprises a first guide rail 301, a second guide rail 302 and an armature 303.

The first guide rail 301 and the second guide rail 302 are both arc-shaped vertical arm structures, the axial cross sections of the first guide rail 301 and the second guide rail 302 are both arc-shaped, and the first guide rail 301 and the second guide rail 302 can be made of tungsten-copper alloy, red copper, brass and the like. The upper end of the power supply module 4 is disposed toward the upper end opening of the lead-out section 103, and the upper end of the power supply module 4 is provided with a mounting surface 6, the mounting surface 6 being perpendicular to the axis of the mounting section 101. First arc groove 7 and second arc groove 8 have been seted up to mounting surface 6, and first arc groove 7 and second arc groove 8 are central symmetry about mounting surface 6. One end of the first guide rail 301 is embedded in the first arc groove 7 and fixed in the first arc groove 7, and the other end of the first guide rail is at least partially abutted against the inner surface of the transition section 102. One end of the second guiding rail 302 is embedded in the second arc groove 8 and fixed in the second arc groove 8, and the other end part is at least abutted against the inner surface of the transition section 102. The first guide rail 301 and the second guide rail 302 are symmetrically distributed about the axis of the mounting section 101, the first guide rail 301 is electrically connected to the positive pole of the power supply module 4 through the first arc groove 7, and the second guide rail 302 is electrically connected to the negative pole of the power supply module 4 through the second arc groove 8.

In other embodiments, the first rail 301 and the second rail 302 may have other shapes, such as long strips, sheets, and the like. In the embodiment shown in fig. 1 and 2, the first guide rail 301 and the second guide rail 302 have a circular arc-shaped axial cross section, and the upper end surfaces thereof respectively and completely abut against the inner surface of the transition section 102.

In another embodiment, the first rail 301 and the second rail 302 may be fixed to the inner surface of the mounting segment 101, as long as the first rail 301 and the positive electrode of the power module 4 can be electrically connected and the second rail 302 and the negative electrode of the power module 4 can be electrically connected, and in this mounting structure, the first rail 301 and the second rail 302 can be electrically conducted only by the armature 303 and conduction through the outer case 1 or other components is avoided.

In this embodiment, the first guide rail 301 and the second guide rail 302 are both fixed to the power supply module 4, and during actual installation, only the power supply module 4 fixed with the first guide rail 301 and the second guide rail 302 needs to be installed in the installation section 101 together, so that the first guide rail 301 and the second guide rail 302 are both abutted to the transition section 102, and then the power supply module 4 is fixed, and there is no need to perform installation operation in a narrow space, which is beneficial to ensuring the installation accuracy of the first guide rail 301 and the second guide rail 302 for the installation surface 6 and the transition section 102, and is beneficial to reducing the assembly difficulty of the whole structure, and improving the convenience of processing.

The armature 303 is integrally in a hollow convex block structure, and comprises an annular vertical arm 3031 and a dome closing structure 3032 located at one end of the annular vertical arm 3031, wherein the annular vertical arm 3031 and the dome closing structure 3032 are made of aluminum alloy. The annular vertical arm 3031 is coaxially arranged between the inner surface of the first guide rail 301 and the inner surface of the second guide rail 302, the outer surface of the annular vertical arm 3031 is respectively attached to the inner surface of the first guide rail 301 and the inner surface of the second guide rail 302, and the outer diameter of the annular vertical arm 3031 is smaller than or equal to the pipe diameter of the leading-out section 103. A dome closure structure 3032 is located at the upper end of the annular upstanding arm 3031 to close the annular upstanding arm 3031.

In other embodiments, the armature 303 may also be a solid bump structure.

When the power supply component is powered on, a closed circuit is formed between the first guide rail 301, the second guide rail 302, the armature 303 and the power supply component 4, and then strong current can be generated on the first guide rail 301, the armature 303 and the second guide rail 302, and a strong magnetic field can be formed between opposite ends of the first guide rail 301 and the second guide rail 302, so that the powered armature 303 is acted by lorentz force, bounces upwards at a great speed, and moves towards the leading-out section 103. In this embodiment, the armature 303 is integrally configured as a hollow bump structure, which, on one hand, can reduce the resistance, increase the current, and further increase the lorentz force, so that the armature 303 can be bounced up at a faster speed; on the other hand, the overall weight of the armature 303 can be reduced.

The inner surface of the mounting section 101 and the inner surface of the transition section 102 are provided with an insulating pad 9 covering the outer surface of the first rail 301 and the outer surface of the second rail 302. The insulating pad 9 can prevent the first rail 301 and the second rail 302 from directly contacting the inner surface of the mounting section 101 and the inner surface of the transition section 102. The interference of external factors on the magnetic field between the opposite ends of the first guide rail 301 and the second guide rail 302 is reduced, and the Lorentz force can be stably output to drive the armature 303 to bounce upwards.

The piston 2 includes a piston head 201 and a piston rod 202 coaxially arranged.

The piston rod 202 is located at the upper end of the piston head 201, and the lower end of the piston head 201 abuts against the upper end of the armature 303. In actual use, when the armature 303 is sprung upward by the lorentz force, the armature 303 pushes the ejection piston 2 to lift upward, and the piston rod 202 lifts the engine cover 12. By means of stable output of the lorentz force to the armature 303, stable output jacking force of the armature 303 to the piston head 201 is ensured, and further the piston rod 202 can stably output jacking force to the engine hood 12. And because the jacking force does not depend on the detonation of gunpowder, the potential safety hazard in the transportation and storage processes is greatly reduced, and the whole electromagnetic jacking device can be reused.

The bushing 10 is coaxially fixed in the guiding section 103, the piston rod 202 is coaxially connected with an inner hole of the bushing 10, the piston rod 202 and the bushing 10 are in interference fit in the embodiment, radial runout of the piston rod 202 is limited through the bushing 10, the piston rod 202 is guided, the piston rod 202 can be ejected out along a preset route, stable jacking of the engine hood 12 is achieved, and reliability in accident occurrence is guaranteed. The inner bore diameter of bushing 10 is smaller than the outer diameter of piston head 201, and is used to limit piston head 201 from disengaging from outer housing 1, which facilitates overall maintenance after an accident.

In other embodiments, the bushing 10 bore may be a clearance fit or transition fit with the piston rod 202.

The shutoff of the opening part of deriving section 103 upper end has rubber buffer 11, and rubber buffer 11 is used for cooperating with sealing washer 5, reduces inside outside steam, greasy dirt and the dust gets into shell body 1, improves holistic leakproofness. And in the in-service use process, the rubber buffer 11 is easily ejecting by piston rod 202, does not form great influence to the jacking of piston rod 202, when the later maintenance, withdraw rubber buffer 11 and block again and derive the opening part of section 103 upper end and can.

In the present embodiment, the power module 4 is provided with an integrated circuit, and the integrated circuit can convert the direct current on the entire vehicle into the current required for the first rail 301, the second rail 302, and the armature 303 to form the lorentz force. And then can adapt to the condition of different whole cars to supply power.

The embodiment of the specification further provides a whole vehicle front structure, and with reference to fig. 1 and 3, the whole vehicle front structure comprises an engine hood 12, an engine compartment 13 and an electromagnetic lifter. The engine cover 12 and the engine compartment 13 are connected through a hinge system 16, and the electromagnetic lifter is installed in the engine compartment 13 through a bracket 17 of the outer shell 1. When a collision occurs, the sensor 14 in the front of the engine compartment 13 transmits a signal to the controller 15 in the engine compartment 13, and the controller 15 triggers the power supply assembly 4 to take power from the battery 18 according to a preset control strategy, so that the armature 303 bounces upwards to push the piston 2, the piston 2 rises to push the engine hood 12, and the pedestrian protection effect is achieved. The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on differences from other embodiments. In particular, for the product embodiments described later, since they correspond to the method, the description is simple, and the relevant points can be referred to the partial description of the system embodiments.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The electromagnetic lifter is characterized by comprising an outer shell (1), a piston (2), an electromagnetic actuating assembly (3) and a power supply assembly (4) connected to the outer shell (1);

the electromagnetic actuating assembly (3) comprises a first guide rail (301), a second guide rail (302) and an armature (303), the first guide rail (301) is fixed in the outer shell (1) and is electrically connected with the positive pole of the power supply assembly (4), the second guide rail (302) is fixed in the outer shell (1) and is electrically connected with the negative pole of the power supply assembly (4), and the armature (303) is arranged on the first guide rail (301) and the second guide rail (302);

the piston (2) is at least partially arranged in the outer shell (1), the lower end of the piston (2) abuts against the upper end of the armature (303), and the upper end of the piston (2) faces to the opening of the outer shell (1);

when the power supply assembly (4) is electrified, a closed circuit is formed among the power supply assembly (4), the first guide rail (301), the armature (303) and the second guide rail (302), and under the action of Lorentz force, the armature (303) bounces upwards along the first guide rail (301) and the second guide rail (302) to push the piston (2) and push the upper end of the piston (2) out of the opening of the outer shell (1).

2. Electromagnetic lifter according to claim 1, characterized in that the outer casing (1) is a tubular structure, the power supply assembly (4) is at least partially nested inside one end of the tubular structure, having a mounting surface (6) facing the other end of the tubular structure, the first guide rail (301) and the second guide rail (302) are arc-shaped upright arm structures, symmetrically fixed to the mounting surface (6), respectively, and the armature (303) is contoured to match the inner surface of the first guide rail (301) and the inner surface of the second guide rail (302).

3. The electromagnetic jacking device according to claim 2, wherein the outer shell (1) comprises a mounting section (101), a leading-out section (103) and a transition section (102) between the mounting section (101) and the leading-out section (103), which are coaxially arranged, and the pipe diameter of the mounting section (101) is larger than that of the leading-out section (103);

the mounting surface (6) is located in the mounting section (101), the mounting surface (6) is provided with a first arc groove (7) and a second arc groove (8), one end of the first guide rail (301) is embedded in the first arc groove (7), the other end of the first guide rail at least partially abuts against the inner surface of the transition section (102), one end of the second guide rail (302) is embedded in the second arc groove (8), and the other end of the second guide rail at least partially abuts against the inner surface of the transition section (102).

4. Electromagnetic lifter according to claim 3, characterized in that the axial section of the first guide rail (301) and the second guide rail (302) is circular arc-shaped;

the armature (303) is of a hollow convex block structure, the armature (303) comprises an annular vertical arm (3031) and a dome closing structure (3032) located at one end of the annular vertical arm (3031), two ends of the outer surface of the annular vertical arm (3031) are respectively attached to the inner surface of the first guide rail (301) and the inner surface of the second guide rail (302), and the dome closing structure (3032) is abutted to the lower end of the piston (2).

5. Electromagnetic jack according to claim 4, characterized in that the outer diameter of the annular upright arm (3031) is less than or equal to the pipe diameter of the lead-out section (103).

6. Electromagnetic lifter according to claim 3, characterized in that an insulating pad (9) is further arranged in the outer shell (1) to block the first guide rail (301) and the second guide rail (302) from directly contacting the leading-out section (103) and the transition section (102).

7. Electromagnetic lifter according to any of claims 3 to 6, characterized in that the piston (2) comprises a piston head (201) and a piston rod (202) arranged coaxially, a bushing (10) being provided inside the lead-out section (103);

the lower end of the piston head (201) abuts against the upper end of the armature (303), the piston rod (202) is located at the upper end of the piston head (201), the piston rod (202) is coaxially connected with the inner hole of the bushing (10), and the inner ring of the bushing (10) is used for limiting the piston rod (202) to jump in the radial direction;

the inner ring diameter of the bushing (10) is smaller than the outer diameter of the piston head (201) and is used for limiting the piston head (201) from being separated from the inside of the outer shell (1).

8. The electromagnetic jacking device according to any one of claims 1 to 6, wherein a rubber plug (11) is arranged at the upper end of the outer shell (1), and the rubber plug (11) is used for plugging the opening of the outer shell (1);

when the armature (303) slides upwards under the action of Lorentz force, the piston (2) moves upwards to push the rubber plug (11) away from the upper end opening of the outer shell (1).

9. Electromagnetic lifter according to any of claims 1 to 6, characterized in that a sealing ring (5) is provided between the outer circumference of the power module (4) and the inner circumference of the outer housing (1).

10. A whole vehicle front structure comprising an engine cover (12) and an engine compartment (13), characterized in that the electromagnetic lifter of any one of claims 1 to 9 is arranged between the engine cover (12) and the engine compartment (13).