Electromagnetic lifter and vehicle front structure

Abstract

The present application provides an electromagnetic lifter and a front structure of a whole vehicle, which are applied to the field of automobile safety technology, and include an outer shell, a piston, an electromagnetic actuating assembly, and a power supply assembly; the electromagnetic actuating assembly includes a first rail, a second rail, and an armature, the first rail is electrically connected to the positive pole of the power supply assembly, the second rail is electrically connected to the negative pole of the power supply assembly, and the armature is arranged on the first rail and the second rail; the lower end of the piston abuts against the upper end of the armature, and the upper end faces the opening of the outer shell; when the power supply assembly is energized, a closed circuit is formed between the power supply, the first rail, the armature, and the second rail, and under the action of the Lorentz force, the armature bounces upward, pushes the piston, and pushes the upper end of the piston out of the opening of the outer shell. The armature lifting process can stably output the lifting force; and it mainly consumes electrical energy, does not rely on disposable consumables such as gunpowder, greatly reduces the safety hazards during transportation and storage, and can also be reused, the overall structure is simple, and is conducive to later maintenance.

Description

Technical Field

[0001] The present application relates to the field of automobile safety technology, and in particular to an electromagnetic lifter and a front structure of a whole vehicle. Background Art

[0002] In order to better protect vulnerable groups in collision accidents, when a car collides with a vulnerable group on the road, the rear end of the hood will lift up, increasing the gap between the hood and the rigid structure inside the engine compartment, absorbing the impact kinetic energy generated by the collision, thereby reducing the damage caused to the vulnerable groups.

[0003] Since the collision lasts for a very short time, the engine hood needs to be lifted at a very fast speed to effectively protect the vulnerable groups. At present, the lifting of the engine hood mainly relies on pyrotechnic lifters. However, since pyrotechnic lifters rely on the detonation of gunpowder to achieve lifting, they have the following disadvantages: 1. Gunpowder is easily triggered and detonated during transportation and storage, which poses a safety hazard; 2. The detonation process of gunpowder is difficult to control, resulting in unstable lifting force; 3. Existing pyrotechnic lifters cannot be reused, and once accidentally triggered, there will be high maintenance costs.

[0004] Therefore, a new electromagnetic lifter is needed that can reduce safety hazards during transportation and storage, and can stably output lifting force and be reused. Summary of the invention

[0005] In view of this, the embodiments of the present specification provide an electromagnetic lifter and a front structure of a vehicle, which can reduce safety hazards during transportation and storage, and at the same time can stably output the lifting force and be reused.

[0006] The embodiments of this specification provide the following technical solutions:

[0007] The embodiment of this specification provides an electromagnetic lifter, including an outer shell, a piston, an electromagnetic actuation assembly, and a power supply assembly connected to the outer shell;

[0008] The electromagnetic actuation assembly comprises a first guide rail, a second guide rail and an armature, wherein the first guide rail is fixed in the outer shell and electrically connected to the positive electrode of the power supply assembly, the second guide rail is fixed in the outer shell and electrically connected to the negative electrode of the power supply assembly, and the armature is arranged on the first guide rail and the second guide rail;

[0009] The piston is at least partially disposed 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 the opening of the outer shell;

[0010] When the power supply assembly is powered on, a closed circuit is formed between the power supply, the first guide rail, the armature and the second guide rail. Under the action of the Lorentz force, the armature bounces upward along the first guide rail and the second guide rail, pushing the piston and ejecting the upper end of the piston from the opening of the outer shell.

[0011] Through the above technical solution, a closed circuit is formed between the first guide rail, the second guide rail, the armature and the power supply assembly. When the power supply assembly is energized, the Lorentz force can be used to generate a driving force on the armature, so that the armature bounces upward and pushes the piston. The whole process can output the lifting force stably. It mainly consumes electrical energy and does not rely on disposable consumables such as gunpowder. On the one hand, it greatly reduces the safety hazards during transportation and storage. On the other hand, it can be reused. The overall structure is simple, which is conducive to later maintenance.

[0012] Preferably, the outer shell is a tubular structure, the power supply assembly 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 vertical arm structures, which are symmetrically fixed on the mounting surface respectively, and the armature profile matches the inner surface of the first guide rail and the inner surface of the second guide rail.

[0013] Through the above technical solution, the first guide rail and the second guide rail are directly fixedly connected to the power supply assembly through the mounting surface. On the one hand, the first guide rail and the second guide rail can be installed on the power supply assembly in advance outside the outer shell, which is convenient for operation and reduces the difficulty of assembly. On the other hand, the first guide rail and the second guide rail are fixed on the power supply assembly before being installed in the outer shell, which is conducive to adjusting the relative position between the first guide rail and the second guide rail, ensuring the overall installation accuracy and improving reliability.

[0014] Preferably, the outer shell comprises a coaxially arranged installation section, an outlet section and a transition section between the installation section and the outlet section, and the diameter of the installation section is larger than the diameter of the outlet section;

[0015] The mounting surface is located in the mounting section, and 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, and the other end 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 at least partially abuts against the inner surface of the transition section.

[0016] Through the above technical solution, the axial ends of the first guide rail and the second guide rail are limited respectively by relying on the power supply assembly and the transition section. After the power supply assembly is fixed relative to the outer shell, the axial positions of the first guide rail and the second guide rail are completely restricted, and there is no need to add additional steps to fix the first guide rail and the second guide rail, thereby greatly reducing the assembly difficulty of the entire electromagnetic lifter.

[0017] Preferably, the axial cross-sections of the first guide rail and the second guide rail are in the shape of circular arcs;

[0018] The armature is a hollow convex block structure, comprising an annular vertical arm and a dome closed structure at one end of the annular vertical arm, the two ends of the outer surface of the annular vertical arm are respectively in contact with the inner surface of the first guide rail and the inner surface of the second guide rail, and the dome closed structure abuts against the lower end of the piston.

[0019] Preferably, the outer diameter of the annular vertical arm is smaller than or equal to the pipe diameter of the lead-out section.

[0020] Through the above technical solution, the contact between the armature and the inner wall of the lead-out section during the armature's rebound process can be reduced, the external force loss when the armature pushes the piston can be reduced, and the ejection efficiency of the piston can be improved.

[0021] Preferably, an insulating pad is further provided in the outer shell to prevent the first guide rail and the second guide rail from directly contacting the lead-out section and the transition section.

[0022] Through the above technical solution, an insulating pad is provided to block the first guide rail and the second guide rail, thereby reducing external electromagnetic interference and improving the overall reliability of the electromagnetic lifter.

[0023] Preferably, the piston comprises a coaxially arranged piston head and a piston rod, and a bushing is provided in the lead-out section;

[0024] The lower end of the piston head abuts against the upper end of the armature, the piston rod is located at the upper end of the piston head, the piston rod is coaxially connected to the inner hole of the bushing, and the inner ring of the bushing is used to limit the radial jump of the piston rod;

[0025] The inner ring diameter of the bushing is smaller than the outer diameter of the piston head, and is used to limit the piston head from being separated from the inner part of the outer shell.

[0026] Through the above technical solution, a bushing is provided to limit the piston rod and restrict the piston head from detaching. On the one hand, it can ensure that the piston rod can be ejected along a predetermined route without deviation; on the other hand, the bushing can also limit the piston head and reduce the possibility of the piston being ejected as a whole, which is beneficial for maintenance after use.

[0027] Preferably, a rubber plug is provided at the upper end of the outer shell, and the rubber plug is used to seal the opening of the outer shell;

[0028] When the armature slides upward under the action of the Lorentz force, the piston moves upward to push the rubber plug away from the upper end opening of the outer shell.

[0029] Preferably, a sealing ring is provided between the outer periphery of the power supply assembly and the inner periphery of the outer shell.

[0030] The embodiment of the present specification also provides a front structure of a whole vehicle, including an engine hood and an engine compartment, characterized in that any of the above-mentioned electromagnetic lifters is provided between the engine hood and the engine compartment.

[0031] Through the above technical solution, the potential safety hazards during transportation and storage are reduced, and at the same time, the lifting force can be stably output and reused.

[0032] Compared with the prior art, the at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

[0033] 1. When the power supply assembly is powered on, a closed circuit is formed between the first guide rail, the second guide rail, the armature and the power supply assembly, generating a Lorentz force. Under the action of the Lorentz force, the armature bounces upward and pushes the piston, so that the whole process can output a stable lifting force;

[0034] 2. Since the piston relies on the Lorentz force when it is lifted upward, it mainly consumes electrical energy and does not rely on disposable consumables such as gunpowder, thus greatly reducing the safety hazards during transportation and storage, and it can also be reused;

[0035] 3. The electromagnetic lifter formed by the outer shell, the first guide rail, the second guide rail, the armature and the piston has a simple overall structure, which is conducive to later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 is a schematic cross-sectional view of the overall structure of the electromagnetic lifter in this embodiment;

[0038] Figure 2 is an exploded schematic diagram of the electromagnetic lifter in this embodiment;

[0039] Figure 3 It is a schematic diagram of the front structure of the whole vehicle in this embodiment.

[0040] Description of the drawings: 1. outer shell; 101. mounting section; 102. transition section; 103. lead-out section; 2. piston; 201. piston head; 202. piston rod; 3. electromagnetic actuation assembly; 301. first guide rail; 302. second guide rail; 303. armature; 3031. annular vertical arm; 3032. dome closure structure; 4. power supply assembly; 5. sealing ring; 6. mounting surface; 7. first arc groove; 8. second arc groove; 9. insulating pad; 10. bushing; 11. rubber plug; 12. engine hood; 13. engine compartment; 14. sensor; 15. controller; 16. hinge system; 17. bracket; 18. battery. DETAILED DESCRIPTION

[0041] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0042] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0043] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0044] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0045] Additionally, 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 examples can be practiced without these specific details.

[0046] The inventors found that the lifters in the prior art mainly rely on the detonation of gunpowder to achieve lifting. However, the lifters that rely on the detonation of gunpowder to achieve lifting have the following disadvantages: 1. The gunpowder is easily triggered to detonate during transportation and storage, which poses a safety hazard; 2. The detonation process of gunpowder is difficult to control, resulting in unstable lifting force; 3. The existing pyrotechnic lifters cannot be reused, and once accidentally triggered, there will be a high maintenance cost.

[0047] In view of this, the present specification proposes an electromagnetic lifter, referring to Figure 1 , including an outer shell 1, a power supply assembly 4, a first guide rail 301, a second guide rail 302, an armature 303 and a piston 2. 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, generating a Lorentz force, pushing the armature 303 upward to push the piston 2 to achieve lifting. Compared with the method of achieving lifting by detonating gunpowder, the output lifting force is easier to control and more stable, and since the use of gunpowder is avoided, the safety hazard is reduced, and it can also be reused.

[0048] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0049] like Figure 1 and Figure 2 As shown, the embodiment of this specification provides an electromagnetic lifter, which includes an outer shell 1, a piston 2, an electromagnetic actuating assembly 3 and a power supply assembly 4.

[0050] The outer shell 1 is a tubular structure, and includes a coaxially arranged installation section 101, an outlet section 103, and a transition section 102 located between the installation section 101 and the outlet section 103. The diameter of the installation section 101 is larger than that of the outlet section 103, and the installation section 101 is located at the lower end of the outlet section 103.

[0051] The power supply component 4 is cylindrical as a whole, the upper end of the power supply component 4 is coaxially nested in the mounting section 101, and the lower end protrudes from the lower end of the mounting section 101. The outer periphery of the power supply component 4 and the inner periphery of the mounting section 101 are fixedly connected by riveting, and a sealing ring 5 is coaxially installed between the outer periphery of the power supply component 4 and the inner periphery of the mounting section 101 to achieve sealing. In this embodiment, the specific type of the sealing ring 5 is an O-ring.

[0052] In other embodiments, the power supply assembly 4 may also be completely embedded in the installation section 101, and the sealing ring 5 may also be a U-shaped ring, a V-shaped ring, etc.

[0053] The electromagnetic actuation assembly 3 includes a first guide rail 301 , a second guide rail 302 and an armature 303 .

[0054] The first guide rail 301 and the second guide rail 302 are both arc-shaped vertical arm structures, and the axial cross-sections of the first guide rail 301 and the second guide rail 302 are both arc-shaped, and the materials of the first guide rail 301 and the second guide rail 302 can be tungsten copper alloy, copper and brass. The upper end of the power supply component 4 is arranged toward the upper end opening of the outlet section 103, and the upper end of the power supply component 4 is provided with a mounting surface 6, and the mounting surface 6 is perpendicular to the axis of the mounting section 101. The mounting surface 6 is provided with a first arc groove 7 and a second arc groove 8, and the first arc groove 7 and the second arc groove 8 are centrally symmetrical about the 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 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 fixed in the second arc groove 8, and the other end at least partially abuts 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 installation section 101 , the first guide rail 301 is electrically connected to the positive pole of the power supply assembly 4 through the first arc groove 7 , and the second guide rail 302 is electrically connected to the negative pole of the power supply assembly 4 through the second arc groove 8 .

[0055] In other embodiments, the first guide rail 301 and the second guide rail 302 may also be structures of other shapes, such as strips, sheets, etc. Figure 1 and Figure 2 In the illustrated embodiment, the axial cross-sections of the first guide rail 301 and the second guide rail 302 are arc-shaped, and the upper end surfaces thereof are respectively and completely in contact with the inner surface of the transition section 102 .

[0056] In other embodiments, the first guide rail 301 and the second guide rail 302 can also be fixed on the inner surface of the installation section 101, as long as the first guide rail 301 can be electrically connected to the positive pole of the power supply component 4, and the second guide rail 302 can be electrically connected to the negative pole of the power supply component 4. In this installation structure, the first guide rail 301 and the second guide rail 302 can only achieve circuit conduction through the armature 303, avoiding conduction through the outer shell 1 or other components.

[0057] In the present embodiment, the first guide rail 301 and the second guide rail 302 are respectively fixed on the power supply assembly 4. During actual installation, it is only necessary to load the power supply assembly 4 fixed with the first guide rail 301 and the second guide rail 302 into the installation section 101 together, so that the first guide rail 301 and the second guide rail 302 are respectively in contact with the transition section 102, and then fix the power supply assembly 4. There is no need to perform installation operations in a narrow space. On the one hand, it is beneficial to ensure the installation accuracy of the first guide rail 301 and the second guide rail 302 relative to the installation surface 6 and the transition section 102. On the other hand, it is also beneficial to reduce the assembly difficulty of the overall structure and improve the convenience of processing.

[0058] The armature 303 is a hollow convex block structure as a whole, including an annular arm 3031 and a dome closure structure 3032 located at one end of the annular arm 3031, and the annular arm 3031 and the dome closure structure 3032 are both made of aluminum alloy. The annular 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, and the outer surface of the annular arm 3031 is respectively in contact with 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 arm 3031 is less than or equal to the diameter of the lead-out section 103. The dome closure structure 3032 is located at the upper end of the annular arm 3031 to close the annular arm 3031.

[0059] In other embodiments, the armature 303 may also be a solid bump structure.

[0060] When the power supply assembly is powered on, a closed circuit is formed between the first rail 301, the second rail 302, the armature 303 and the power supply assembly 4, and then a strong current is generated on the first rail 301, the armature 303 and the second rail 302, and a strong magnetic field is formed between the opposite ends of the first rail 301 and the second rail 302, so that the powered armature 303 is subjected to the Lorentz force, and bounces upward at a great speed and moves toward the lead-out section 103. In this embodiment, the armature 303 is configured as a hollow convex block structure as a whole, which can reduce resistance, increase current, and then increase the Lorentz force, so that the armature 303 can bounce upward at a faster speed; on the other hand, the overall weight of the armature 303 can be reduced.

[0061] The inner surface of the installation 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 guide rail 301 and the outer surface of the second guide rail 302. The insulating pad 9 can prevent the first guide rail 301 and the second guide rail 302 from directly contacting the inner surface of the installation 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, ensuring that the Lorentz force can be stably output to drive the armature 303 to bounce upward.

[0062] The piston 2 includes a piston head 201 and a piston rod 202 which are coaxially arranged.

[0063] 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 bounced upward by the Lorentz force, the armature 303 will push the piston 2 upward, and the engine hood 12 will be lifted through the piston rod 202. Relying on the stable output of the Lorentz force on the armature 303, the armature 303 is guaranteed to output a stable pushing force on the piston head 201, so that the piston rod 202 can output a stable lifting force on the engine hood 12. And because the lifting force no longer depends on the detonation of gunpowder, it also greatly reduces the safety hazards during transportation and storage, and it can also achieve the reuse of the entire electromagnetic lifter.

[0064] A bushing 10 is coaxially fixed in the lead-out section 103, and the piston rod 202 is coaxially connected to the inner hole of the bushing 10. In this embodiment, the piston rod 202 and the bushing 10 are interference fit, and the bushing 10 limits the radial runout of the piston rod 202 and guides the piston rod 202, ensuring that the piston rod 202 can be ejected along a preset route, achieving stable lifting of the engine hood 12, and ensuring reliability in the event of an accident. The inner hole diameter of the bushing 10 is smaller than the outer diameter of the piston head 201, and is used to limit the piston head 201 from detaching from the outer shell 1, facilitating overall maintenance after an accident.

[0065] In other embodiments, the inner hole of the bushing 10 and the piston rod 202 may also be a clearance fit or a transition fit.

[0066] The opening at the upper end of the outlet section 103 is sealed with a rubber plug 11, which is used to cooperate with the sealing ring 5 to reduce external water vapor, oil and dust from entering the outer shell 1 and improve the overall sealing. In actual use, the rubber plug 11 is easily pushed out by the piston rod 202, and does not have a significant impact on the lifting of the piston rod 202. During later maintenance, the rubber plug 11 can be retracted to re-seal the opening at the upper end of the outlet section 103.

[0067] In this embodiment, the power supply assembly 4 is provided with an integrated circuit, which can convert the DC power on the vehicle into the current required for the first rail 301, the second rail 302 and the armature 303 to form the Lorentz force, thereby adapting to the conditions of different vehicles for power supply.

[0068] The embodiment of this specification also provides a front structure of a vehicle, referring to Figure 1 and Figure 3, including an engine hood 12, an engine compartment 13 and an electromagnetic lifter. The engine hood 12 and the engine compartment 13 are connected by 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 at the front of the engine compartment 13 will transmit a signal to the controller 15 in the engine compartment 13. The controller 15 triggers the power supply assembly 4 to draw power from the battery 18 according to the preset control strategy, so that the armature 303 bounces upward and pushes the piston 2. The piston 2 rises and lifts the engine hood 12, thereby protecting pedestrians.

[0069] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the product embodiment described later, since it corresponds to the method, the description is relatively simple, and the relevant parts can be referred to the partial description of the system embodiment.

[0070] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An electromagnetic lifter, characterized in that: It comprises an outer shell (1), a piston (2), an electromagnetic actuation assembly (3), and a power supply assembly (4) connected to the outer shell (1); The electromagnetic actuation 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 to 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 to 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 disposed 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 the opening of the outer shell (1); The outer shell (1) is a tubular structure, the power supply assembly (4) is at least partially nested inside one end of the tubular structure, and has 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 vertical arm structures, respectively symmetrically fixed on the mounting surface (6), and the contour of the armature (303) matches the inner surface of the first guide rail (301) and the inner surface of the second guide rail (302); The outer shell (1) comprises a coaxially arranged mounting section (101), a lead-out section (103), and a transition section (102) between the mounting section (101) and the lead-out section (103); the diameter of the mounting section (101) is larger than the diameter of the lead-out section (103); The mounting surface (6) is located in the mounting section (101), and 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), and the other end 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 at least partially abuts against the inner surface of the transition section (102); When the power supply assembly (4) is powered on, a closed circuit is formed between the power supply assembly (4), the first guide rail (301), the armature (303) and the second guide rail (302). Under the action of the Lorentz force, the armature (303) bounces upward along the first guide rail (301) and the second guide rail (302) and moves toward the lead-out section (103), and pushes the piston (2), thereby pushing the upper end of the piston (2) out of the opening of the outer shell (1).

2. The electromagnetic lifter according to claim 1, characterized in that: The axial cross-sections of the first guide rail (301) and the second guide rail (302) are in the shape of circular arcs; The armature (303) is a hollow convex block structure, comprising an annular vertical arm (3031) and a dome closed structure (3032) located at one end of the annular vertical arm (3031), the two ends of the outer surface of the annular vertical arm (3031) respectively fit with the inner surface of the first guide rail (301) and the inner surface of the second guide rail (302), and the dome closed structure (3032) abuts against the lower end of the piston (2).

3. The electromagnetic lifter according to claim 2, characterized in that: The outer diameter of the annular vertical arm (3031) is smaller than or equal to the pipe diameter of the outlet section (103).

4. The electromagnetic lifter according to claim 1, characterized in that: An insulating pad (9) is also provided in the outer shell (1) to prevent the first guide rail (301) and the second guide rail (302) from directly contacting the lead-out section (103) and the transition section (102).

5. The electromagnetic lifter according to any one of claims 1 to 4, characterized in that: The piston (2) comprises a coaxially arranged piston head (201) and a piston rod (202), and a bushing (10) is provided in the outlet 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 to the inner hole of the bushing (10), and the inner ring of the bushing (10) is used to limit the radial runout of the piston rod (202); The inner diameter of the bushing (10) is smaller than the outer diameter of the piston head (201), and is used to prevent the piston head (201) from detaching from the inside of the outer shell (1).

6. The electromagnetic lifter according to any one of claims 1 to 4, characterized in that: A rubber plug (11) is provided at the upper end of the outer shell (1), and the rubber plug (11) is used to seal the opening of the outer shell (1); When the armature (303) slides upward under the action of the Lorentz force, the piston (2) moves upward to push the rubber plug (11) away from the upper end opening of the outer shell (1).

7. The electromagnetic lifter according to any one of claims 1 to 4, characterized in that: A sealing ring (5) is provided between the outer periphery of the power supply component (4) and the inner periphery of the outer shell (1).

8. A vehicle front structure, comprising an engine hood (12) and an engine compartment (13), characterized in that: An electromagnetic lifter as claimed in any one of claims 1 to 7 is provided between the engine hood (12) and the engine compartment (13).

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