Sliding rail moving type wall-mounted automobile charging pile

Abstract

The invention belongs to the technical field of charging piles, and discloses a sliding rail moving type wall-mounted automobile charging pile which comprises a support and a mounting box, a sliding rail is mounted on the inner wall of the support, a sliding block is slidably mounted on the outer surface of the sliding rail, a metal plate is fixedly mounted on the top of the sliding block, and a charging pile body is fixedly mounted on a bottom plate of the sliding block. And a charging gun is installed on the side face of the charging pile, a photovoltaic panel is fixedly installed at the top of the installation box, and two sets of second pole pieces are installed at the bottom of the photovoltaic panel. According to the device, the capacitor is designed to supply power to the electromagnet and generate magnetic attraction force, the metal block, the metal plate, the sliding block and the charging pile are pulled upwards, the gravity from the charging pile is offset, the pressure of the sliding block and the charging pile on the sliding rail is reduced, and due to the design, when the charging pile moves, internal stress damage to the sliding rail is remarkably reduced; and the service life of the device is greatly prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of charging piles, and particularly relates to a sliding rail mobile wall-mounted vehicle charging pile. Background Art

[0002] A vehicle charging pile is a power supply device used to charge new energy vehicles (with lithium batteries as the main energy storage carrier). As the battery capacity of new energy vehicles increases, maintaining a relatively fast charging speed has quickly become a necessity. Therefore, the charging power of vehicle charging piles has also increased accordingly, and the weight of vehicle charging piles has also increased. Currently, in order to improve the utilization rate of vehicle charging piles, the market has gradually adopted a guide rail and wall-mounted structure, enabling the charging pile to freely move behind the designated parking space to charge the designated new energy vehicle. This design avoids the waste of one charging pile corresponding to one parking space, but the following problems arise: the charging pile with too high charging power becomes very heavy, and users will damage the charging pile guide rail due to friction and gravity during the movement of the charging pile, and the process of moving the charging pile also becomes time-consuming and laborious. Especially outdoors, the corrosion of sunlight and rain will accelerate the aging of the guide rail used to support the charging pile. Coupled with the internal stress exerted on the guide rail when moving the charging pile, the service life of the guide rail is significantly shortened. Summary of the Invention

[0003] The purpose of the invention is to provide a sliding rail mobile wall-mounted vehicle charging pile to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the invention provides the following technical solution: A sliding rail mobile wall-mounted vehicle charging pile, including a bracket and an installation box. A sliding rail is installed on the inner wall of the bracket. A slider is slidably installed on the outer surface of the sliding rail. A metal plate is fixedly installed on the top of the slider. A charging pile is fixedly installed on the bottom plate of the slider. A charging gun is installed on the side of the charging pile. A photovoltaic panel is fixedly installed on the top of the installation box. Two groups of pole pieces two are installed at the bottom of the photovoltaic panel. A telescopic rod is fixedly installed on the top of the inner wall of the installation box. The telescopic end of the telescopic rod is fixedly connected with a capacitor. Two groups of pole pieces three are fixedly connected to the top of the capacitor. Two groups of pole pieces four are fixedly connected to the bottom of the capacitor. A fixed platform is fixedly installed on the inner wall of the installation box below the capacitor. A plurality of electromagnets are fixedly installed horizontally and equidistantly inside the fixed platform. Two groups of pole pieces one are fixedly installed on the top of the fixed platform. A wire is electrically connected between the plurality of electromagnets. The electromagnets are electrically connected with the pole pieces one. The pole pieces two and the pole pieces three are in contact. The slider can move in the vertical direction.

[0005] As a preferred solution of the invention, both the telescopic rod and the charging pile are powered by external cables. The photovoltaic panel and the capacitor are electrically connected through two groups of pole pieces two and two groups of pole pieces three to form an energized circuit.

[0006] As a preferred embodiment of the present invention, two sets of the second pole pieces, the third pole pieces, and the first pole pieces respectively form positive and negative electrodes. The leftmost first pole piece is electrically connected to the leftmost electromagnet, and the rightmost first pole piece is electrically connected to the rightmost electromagnet.

[0007] As a preferred embodiment of the present invention, a placement groove is provided on the inner wall of the slide rail. Support columns are fixedly installed on both the front and rear sides of the inner wall of the slider. Rotating wheels are rotatably installed on the outer surfaces of the support columns. The two rotating wheels respectively abut and support inside the front and rear placement grooves. Two card slots located above and below the support columns are provided on both the front and rear sides of the inner wall of the slider. Steel balls are rotatably installed inside the card slots, and the outer surfaces of the steel balls are rotatably abutted against the surface of the slide rail.

[0008] As a preferred embodiment of the present invention, multiple electromagnets are connected in series through wires. Three metal blocks with the same diameter and spacing as the electromagnets are provided on the top of the metal plate.

[0009] As a preferred embodiment of the present invention, there is a gap a between the top of the outer surface of the rotating wheel and the top of the placement groove, and a gap b between the bottom end of the electromagnet and the top end of the metal block, and a < b.

[0010] As a preferred embodiment of the present invention, guide columns are fixedly installed on both the left and right sides of the top of the capacitor. Guide cylinders are fixedly installed on both the left and right sides of the top inner wall of the installation box. The guide columns are adaptively inserted into the inner walls of the guide cylinders.

[0011] As a preferred embodiment of the present invention, when the telescopic rod drives the capacitor to move downward, the second pole piece and the third pole piece are separated from contact, the fourth pole piece abuts against the first pole piece, and at this time, the capacitor forms an energized circuit with multiple electromagnets through the first pole piece and the fourth pole piece.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. The device has been optimized, greatly reducing the internal stress damage to the slide rail caused by the movement of the slider and the charging pile. By setting a capacitor to store the electric energy generated by the photovoltaic panel for power generation, when it is necessary to move the slider and the charging pile to the position of the charging vehicle, the telescopic rod can drive the capacitor to move downward, drive the fourth pole piece to abut against the first pole piece, and form a series-connected energized circuit between the capacitor and multiple electromagnets. At this time, the capacitor supplies power to the electromagnets and generates magnetic suction, pulling up the metal block, the metal plate, the slider, and the charging pile, and offsetting the gravity from the charging pile, reducing the pressure of the slider and the charging pile on the slide rail. Such a design significantly reduces the internal stress damage to the slide rail when the charging pile moves, greatly extending the service life of the device.

[0014] 2. At the same time, the device also provides an energy source for the capacitor by arranging a photovoltaic panel on the top of the installation box without consuming additional electrical energy. The device utilizes the characteristics of the capacitor that can store energy and automatically release energy, and designs a telescopic rod to drive the capacitor to move up and down: up, the capacitor is driven to move upward by the telescopic rod, and the pole piece three is driven to abut against the pole piece two, forming a power-on circuit with the photovoltaic panel and charging the capacitor; down, the capacitor is driven to move downward by the telescopic rod, and the pole piece three is driven to break contact with the pole piece two, ending energy storage, and at the same time, the pole piece four is driven to abut against the pole piece one, forming a power-on circuit with the electromagnet, so that the electromagnet can magnetically attract metal blocks and metal plates downward, provide pulling force for the slider and the charging pile, and offset the gravity of the charging pile. This design reduces the complex steps of connecting to the power grid and the additional power consumption, and has the advantage of high reliability.

[0015] 3. The device also installs two sets of support columns and a rotating wheel inside the slider. When the electromagnet generates an upward magnetic attraction force on the metal plate and the metal block, the rotating wheel gradually reduces the contact with the bottom of the inner wall of the placement groove under the drive of the upward movement of the slider, and the pressure of the rotating wheel on the slide rail will be greatly reduced. At this time, when the charging pile drives the slider to move horizontally along the surface of the slide rail, it will drive the rotating wheel to rotate. At this time, most of the pressure generated by the rotating wheel on the placement groove is offset by the magnetic attraction force generated by the electromagnet. Therefore, the movement of the slider and the charging pile will save time and effort, and at the same time reduce the pressure damage of the rotating wheel on the surface of the slide rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the front appearance of the overall structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the internal structure of the installation box of the present invention;

[0018] Figure 3 For the present invention Figure 2 A magnified schematic diagram of the structure at center A;

[0019] Figure 4 It is a side cutaway schematic diagram of the installation box and photovoltaic panel of the present invention;

[0020] Figure 5 For the present invention Figure 4 A magnified schematic diagram of the structure at B in the middle;

[0021] Figure 6 It is a partial structural schematic diagram of the slide rail, slider, metal plate, metal block, charging pile and charging gun of the present invention;

[0022] Figure 7 It is a top view cutaway schematic diagram of the installation box of the present invention;

[0023] Figure 8This is a schematic diagram of the separation of the photovoltaic panel, electromagnet, and capacitor of the present invention.

[0024] In the figure: 1, bracket; 2, installation box; 3, photovoltaic panel; 4, slide rail; 5, slider; 6, metal plate; 7, metal block; 8, charging pile; 9, charging gun; 10, placement groove; 11, fixed platform; 12, electromagnet; 13, wire; 14, first pole piece; 15, telescopic rod; 16, capacitor; 17, guide cylinder; 18, guide post; 19, second pole piece; 20, third pole piece; 21, fourth pole piece; 22, support column; 23, runner; 24, card slot; 25, steel ball. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] As Figures 1 to 8 shown, the embodiment of the present invention provides a wall-mounted vehicle charging pile with a sliding rail for movement, including a bracket 1 and an installation box 2. A slide rail 4 is installed on the inner wall of the bracket 1, and a slider 5 is slidably installed on the outer surface of the slide rail 4. A metal plate 6 is fixedly installed on the top of the slider 5, and a charging pile 8 is fixedly installed on the bottom plate of the slider 5. A charging gun 9 is installed on the side of the charging pile 8. A photovoltaic panel 3 is fixedly installed on the top of the installation box 2. Two groups of second pole pieces 19 are installed at the bottom of the photovoltaic panel 3. A telescopic rod 15 is fixedly installed on the top of the inner wall of the installation box 2. The telescopic end of the telescopic rod 15 is fixedly connected to a capacitor 16. Two groups of third pole pieces 20 are fixedly connected to the top of the capacitor 16. Two groups of fourth pole pieces 21 are fixedly connected to the bottom of the capacitor 16. A fixed platform 11 is fixedly installed on the inner wall of the installation box 2 below the capacitor 16. A plurality of electromagnets 12 are fixedly installed horizontally and equidistantly inside the fixed platform 11. Two groups of first pole pieces 14 are fixedly installed on the top of the fixed platform 11. A wire 13 is electrically connected between the plurality of electromagnets 12. The electromagnet 12 is electrically connected to the first pole piece 14. The second pole piece 19 and the third pole piece 20 are in contact. The slider 5 can move in the vertical direction;

[0027] This device has been optimized to significantly reduce the internal stress damage to the slide rail 4 caused by the movement of the slider 5 and the charging pile 8. By setting a capacitor 16 to store the electric energy generated by the photovoltaic panel 3 for power generation, when it is necessary to move the slider 5 and the charging pile 8 to the position of the charging vehicle, the telescopic rod 15 can be used to drive the capacitor 16 to move downward, driving the fourth pole piece 21 to abut against the first pole piece 14, and forming a series energized circuit with the capacitor 16 and multiple electromagnets 12. At this time, the capacitor 16 supplies power to the electromagnets 12 and generates magnetic attraction, pulling up the metal block 7, the metal plate 6, the slider 5 and the charging pile 8, and offsetting the gravity from the charging pile 8, so that the pressure of the slider 5 and the charging pile 8 on the slide rail 4 is reduced. Such a design significantly reduces the internal stress damage suffered by the slide rail 4 when the charging pile 8 moves, and greatly extends the service life of the device.

[0028] At the same time, this device also provides an energy source for the capacitor 16 by setting a photovoltaic panel 3 on the top of the installation box 2, without consuming additional electric energy. Utilizing the characteristics of the capacitor 16 to store energy and automatically release energy, the telescopic rod 15 is designed to drive the capacitor 16 to move up and down: when moving up, the telescopic rod 15 drives the capacitor 16 to move upward, driving the third pole piece 20 to abut against the second pole piece 19, forming an energized circuit with the photovoltaic panel 3, and charging the capacitor 16; when moving down, the telescopic rod 15 drives the capacitor 16 to move downward, driving the third pole piece 20 to disengage from the second pole piece 19, ending the energy storage. At the same time, it drives the fourth pole piece 21 to abut against the first pole piece 14, forming an energized circuit with the electromagnet 12, enabling the electromagnet 12 to magnetically attract the metal block 7 and the metal plate 6 downward, providing a pulling force for the slider 5 and the charging pile 8 to offset the gravity of the charging pile 8. This design reduces the complex steps of connecting to the power grid and the consumption of additional electric energy, and has the advantage of high reliability.

[0029] Among them, both the telescopic rod 15 and the charging pile 8 are powered by external cables. The photovoltaic panel 3 and the capacitor 16 are electrically connected through two groups of second pole pieces 19 and two groups of third pole pieces 20, and an energized circuit is formed.

[0030] The telescopic rod 15 and the charging pile 8 are connected to the power grid and are uniformly controlled by the controller built into the charging pile 8. The photovoltaic panel 3 absorbs light energy and converts it into electric energy to be stored in the capacitor 16.

[0031] Among them, the two groups of second pole pieces 19, the third pole pieces 20 and the first pole piece 14 respectively form positive and negative poles. The leftmost first pole piece 14 is electrically connected to the leftmost electromagnet 12, and the rightmost first pole piece 14 is electrically connected to the rightmost electromagnet 12.

[0032] The positive and negative poles of multiple electromagnets 12 are connected end to end, and a series circuit is formed with the capacitor 16 through the first pole piece 14 to ensure that the capacitor 16 can stably supply power to the electromagnets 12 through discharging.

[0033] Among them, a placement groove 10 is formed in the inner wall of the slide rail 4. Support columns 22 are fixedly installed on both the front and rear sides of the inner wall of the slider 5. Rotating wheels 23 are rotatably installed on the outer surfaces of the support columns 22. The two groups of rotating wheels 23 are respectively abutted and supported inside the front and rear two groups of placement grooves 10. Two groups of clamping grooves 24 are formed on both the front and rear sides of the inner wall of the slider 5 and are located on the upper and lower sides of the support columns 22. Steel balls 25 are rotatably installed inside the clamping grooves 24. The outer surfaces of the steel balls 25 are rotatably abutted against the surface of the slide rail 4;

[0034] Two support columns 22 and rotating wheels 23 are additionally installed inside the slider 5 of this device. When the electromagnet 12 generates an upward magnetic attraction force on the metal plate 6 and the metal block 7, the rotating wheel 23, driven by the upward movement of the slider 5, gradually reduces the abutment against the bottom of the inner wall of the placement groove 10, and the pressure of the rotating wheel 23 on the slide rail 4 will be greatly reduced. At this time, when the charging pile 8 drives the slider 5 to move horizontally along the surface of the slide rail 4, it will drive the rotating wheel 23 to rotate. At this time, since most of the pressure generated by the rotating wheel 23 on the placement groove 10 is offset by the magnetic attraction force generated by the electromagnet 12, therefore, the movement of the slider 5 and the charging pile 8 will save time and effort, and at the same time reduce the pressure damage of the rotating wheel 23 on the surface of the slide rail 4.

[0035] Among them, multiple electromagnets 12 are connected in series through wires 13. Three metal blocks 7 with the same diameter value and spacing as the electromagnet 12 are provided on the top of the metal plate 6;

[0036] The three metal blocks 7 with a convex design have the same spacing from the electromagnet 12. When the slider 5 drives the metal plate 6 and the metal block 7 to move, the metal block 7 can strengthen the magnetic attraction force of the electromagnet 12 on the metal plate 6.

[0037] Among them, a gap a is left between the top of the outer surface of the rotating wheel 23 and the top of the placement groove 10, and a gap b is left between the bottom end of the electromagnet 12 and the top end of the metal block 7, and a < b;

[0038] As Figure 4 shown, when the slider 5 moves upward under the action of the electromagnet 12, it will drive the support column 22 and the rotating wheel 23 to move upward. Due to the self-weight of the charging pile 8, the upward movement distance of the metal plate 6 is relatively small and it will not contact the electromagnet 12, so it will not affect the horizontal maneuverability of the slider 5 and the charging pile 8.

[0039] Among them, guide columns 18 are fixedly installed on both the left and right sides of the top of the capacitor 16. Guide cylinders 17 are fixedly installed on both the left and right sides of the top of the inner wall of the installation box 2. The guide columns 18 are adaptively inserted into the inner walls of the guide cylinders 17;

[0040] The guide cylinder 17 and the guide column 18 are mutually adapted and arranged, mainly providing a stable guiding function for the capacitor 16 when it moves up and down.

[0041] When the telescopic rod 15 drives the capacitor 16 to move, the second pole piece 19 and the third pole piece 20 are disengaged from contact, and the fourth pole piece 21 abuts against the first pole piece 14. At this time, an energized circuit is formed between the capacitor 16 and the multiple electromagnets 12 through the first pole piece 14 and the fourth pole piece 21;

[0042] The capacitor 16 can only be connected to the photovoltaic panel 3 or the electromagnet 12 at a time to form an energized circuit. After charging, it can discharge energy to the electromagnet 12. Moreover, the capacitor 16 has a large energy storage space, is less affected by environmental stability, and can be replaced like a spare part if damaged, which is convenient and fast, significantly reducing the maintenance cost of the device.

[0043] Working principle:

[0044] When this device is in use, it can be installed outdoors to facilitate the photovoltaic panel 3 to absorb solar energy and generate electricity. As Figure 2 shown, when the capacitor 16 moves upward to the highest position driven by the telescopic rod 15, the third pole piece 20 abuts against the second pole piece 19, and the circuit between the photovoltaic panel 3 and the capacitor 16 is connected to form an energized circuit. At this time, the photovoltaic panel 3 continuously charges and stores energy for the capacitor 16 through photovoltaic power generation;

[0045] Then, when the vehicle needs to be charged, the user first scans the code and pays on the display screen of the charging pile 8. At this time, the controller inside the charging pile 8 controls the telescopic rod 15 to move downward, and makes the second pole piece 19 disengage from the abutment with the third pole piece 20. The circuit between the photovoltaic panel 3 and the capacitor 16 is disconnected. The capacitor 16 drives the fourth pole piece 21 to move downward, and makes the fourth pole piece 21 abut against the first pole piece 14, and connects the circuit between the capacitor 16 and the electromagnet 12. Since the electromagnet 12 is a load, the connected circuit makes the capacitor 16 automatically discharge through the first pole piece 14, the wire 13 and the fourth pole piece 21, and charges the multiple electromagnets 12. The energized electromagnet 12 generates an upward suction force on the metal block 7 and the metal plate 6. As Figure 4 shown, the slider 5 is pulled upward by the metal plate 6 and the metal block 7, so that the support column 22 and the runner 23 are gradually disengaged from the inner wall of the placement groove 10. At this time, the pressure between the runner 23 and the placement groove 10 decreases or becomes zero, and the steel ball 25 provides a limit for the front and rear positions of the slider 5. The user can easily push the charging pile 8 and the slider 5 to move horizontally along the surface of the slide rail 4 to the back of the vehicle to be charged;

[0046] Finally, after the charging gun 9 is inserted into the charging port of the vehicle for charging, after the controller inside the charging pile 8 detects that the slider 5 stops moving, it controls the telescopic rod 15 to drive the capacitor 16 to reset upward. At this time, the circuit between the capacitor 16 and the electromagnet 12 is disconnected, and the circuit is reconnected to the photovoltaic panel 3. At this time, the photovoltaic panel 3 continues to charge the capacitor 16, and the slider 5 remains stationary.

[0047] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0048] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sliding rail movable wall-mounted automobile charging pile, comprising a bracket (1) and an installation box (2), wherein a sliding rail (4) is installed on the inner wall of the bracket (1), characterized in that: A slider (5) is slidably mounted on the outer surface of the slide rail (4), a metal plate (6) is fixedly mounted on the top of the slider (5), a charging pile (8) is fixedly mounted on the bottom plate of the slider (5), a charging gun (9) is mounted on the side of the charging pile (8), a photovoltaic panel (3) is fixedly mounted on the top of the installation box (2), two sets of pole pieces (2) (19) are mounted on the bottom of the photovoltaic panel (3), a telescopic rod (15) is fixedly mounted on the top of the inner wall of the installation box (2), a capacitor (16) is fixedly connected to the telescopic end of the telescopic rod (15), and two sets of pole pieces (3) are fixedly connected to the top of the capacitor (16). 20), two groups of pole pieces four (21) are fixedly connected to the bottom of the capacitor (16), a fixed platform (11) located below the capacitor (16) is fixedly installed on the inner wall of the installation box (2), multiple groups of electromagnets (12) are fixedly installed at equal intervals in the horizontal direction inside the fixed platform (11), two groups of pole pieces one (14) are fixedly installed on the top of the fixed platform (11), wires (13) are electrically connected between the multiple groups of electromagnets (12), the electromagnets (12) are electrically connected to the pole piece one (14), the pole piece two (19) and the pole piece three (20) are abutted, and the slider (5) can move in the vertical direction.

2. The sliding rail movable wall-mounted car charging pile according to claim 1, characterized in that: The telescopic rod (15) and the charging pile (8) are both powered by external cables, and the photovoltaic panel (3) and the capacitor (16) are electrically connected via two sets of pole pieces two (19) and two sets of pole pieces three (20) to form a power circuit.

3. The sliding rail movable wall-mounted car charging pile according to claim 2 is characterized by: The two groups of pole piece two (19), pole piece three (20) and pole piece one (14) respectively form positive and negative poles, the pole piece one (14) located on the far left is electrically connected to the electromagnet (12) located on the far left, and the pole piece one (14) located on the far right is electrically connected to the electromagnet (12) located on the far right.

4. The sliding rail movable wall-mounted car charging pile according to claim 3 is characterized by: The inner wall of the slide rail (4) is provided with a placement groove (10), and support columns (22) are fixedly installed on the front and rear sides of the inner wall of the slider (5), and a rotating wheel (23) is rotatably installed on the outer surface of the supporting column (22). Two groups of rotating wheels (23) are respectively abutted and supported on the inside of the front and rear groups of placement grooves (10). The inner wall of the slider (5) is provided with two groups of clamping grooves (24) located on the upper and lower sides of the supporting column (22), and a steel ball (25) is rotatably installed inside the clamping groove (24), and the outer surface of the steel ball (25) is rotatably abutted against the surface of the slide rail (4).

5. The sliding rail movable wall-mounted car charging pile according to claim 4, characterized in that: A plurality of groups of electromagnets (12) are connected in series via a wire (13), and three groups of metal blocks (7) having the same diameter and spacing as the electromagnets (12) are arranged on the top of the metal plate (6).

6. The sliding rail movable wall-mounted car charging pile according to claim 5, characterized in that: A gap a is left between the top of the outer surface of the rotating wheel (23) and the top of the placement groove (10), and a gap b is left between the bottom end of the electromagnet (12) and the top end of the metal block (7), wherein a<b.

7. The sliding rail movable wall-mounted vehicle charging pile according to claim 6, characterized in that: Guide columns (18) are fixedly installed on both left and right sides of the top of the capacitor (16), and guide cylinders (17) are fixedly installed on both left and right sides of the top of the inner wall of the installation box (2), and the guide columns (18) are adapted to be plugged into the inner wall of the guide cylinder (17).

8. The sliding rail movable wall-mounted vehicle charging pile according to claim 7, characterized in that: When the telescopic rod (15) drives the capacitor (16) to move, the pole piece 2 (19) and the pole piece 3 (20) are out of contact, the pole piece 4 (21) is in contact with the pole piece 1 (14), and at this time, the capacitor (16) forms an electric circuit with the multiple groups of electromagnets (12) through the pole piece 1 (14) and the pole piece 4 (21).

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