Monostable permanent magnetic mechanism with external opening spring

Abstract

The invention discloses a monostable permanent magnetic mechanism with an external opening spring. The monostable permanent magnetic mechanism comprises a mounting rack, an inner static iron core, a magnetic suction module, an end cover, a pull rod, a movable iron core and an elastic piece. An installation space is arranged above the hollow installation frame, and the inner static iron core is fixed in the installation space. The permanent magnet is arranged in an annular space between the inner static iron core and the mounting rack; and the coil is mounted in the mounting rack above the permanent magnet. The end cover and the coil inner cylinder form a sliding space. And the lower end of the pull rod is connected with a moving contact of the vacuum arc-extinguishing chamber. The movable iron core is fixed to the pull rod and can move in the sliding space. And two ends of the elastic piece are respectively connected with the end cover and the pull rod. The mechanism realizes opening and closing through controlling coil current, when a magnetic field is enhanced through electrification, a magnetic attraction force exceeds an elastic restoring force, and a movable iron core drives a pull rod to move downwards to complete closing; when the current weakens the magnetic field, the magnetic attraction force is reduced, and the elastic piece pushes the movable iron core to move upwards to realize opening.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet mechanisms, and in particular to a monostable permanent magnet mechanism with an externally mounted opening spring. Background Technology

[0002] Monostable permanent magnet mechanisms are used to drive high-voltage circuit breakers (especially vacuum circuit breakers) to perform reliable and rapid opening and closing operations, and can automatically remain in the open position in the event of power failure, thereby ensuring the safety of the power system.

[0003] Traditionally, the opening spring of a monostable permanent magnet mechanism is usually located inside the mechanism, such as on the outside of the moving iron core or near the air gap of the magnetic circuit. This built-in method has significant drawbacks: First, the opening spring and its necessary installation space significantly increase the axial dimension of the mechanism, restricting the miniaturization of the entire product. Second, the opening spring is in a closed environment inside the mechanism for a long time, and its operating temperature is easily affected by the heating of the opening and closing coils, which may cause changes in material properties or stress relaxation. Especially under frequent operation or high-temperature conditions, there is a risk of performance degradation and shortened fatigue life. Furthermore, in terms of maintainability and adjustability, adjusting or replacing the built-in opening spring is extremely inconvenient. If it is necessary to change the preload of the opening spring or replace the opening spring, the entire mechanism needs to be disassembled. This not only increases the complexity of factory commissioning but also brings great difficulties to on-site maintenance, thus affecting the applicability and total life cycle cost of the product. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an externally mounted monostable permanent magnet mechanism for the trip spring, which can effectively overcome the problems of bulky structure, short spring life, and difficulty in replacing and maintaining the spring in traditional monostable permanent magnet mechanisms.

[0005] According to an embodiment of the present invention, an externally mounted monostable permanent magnet mechanism for tripping springs includes: a mounting frame, an inner stationary iron core, a magnetic attraction module, an end cap, a pull rod, a moving iron core, and an elastic element. The mounting frame is hollow, and an installation space is provided at the upper end of the mounting frame. The inner stationary iron core is fixed inside the mounting frame, and there is a gap between the inner stationary iron core and the inner wall of the mounting frame. The magnetic attraction module includes a permanent magnet and a tripping / closing coil. The permanent magnet is disposed within the gap between the inner stationary iron core and the inner wall of the mounting frame. The tripping / closing coil is disposed inside the mounting frame and is located at the upper end of the permanent magnet. The tripping / closing coil is energized to increase or decrease the magnetic attraction force of the magnetic attraction module. The end cap is disposed within the installation space, and the end cap and the inner cylinder of the tripping / closing coil define a space. The sliding space is provided; the pull rod passes through the end cover, the sliding space, the inner stationary iron core, and the mounting bracket from top to bottom, and the pull rod can slide in the vertical direction. The lower end of the pull rod is used to connect the moving contact in the vacuum interrupter chamber; the moving iron core is slidably disposed in the sliding space along the axial direction of the opening and closing coil, and the moving iron core is fixed to the pull rod; the elastic element is disposed above the end cover, one end of the elastic element is connected to the pull rod, and the other end of the elastic element is connected to the end cover; when the magnetic attraction force of the magnetic attraction module on the moving iron core is less than the elastic restoring force of the elastic element on the moving iron core, the moving iron core slides upward; when the magnetic attraction force of the magnetic attraction module on the moving iron core is greater than the elastic restoring force of the elastic element on the moving iron core, the moving iron core slides downward.

[0006] It has at least the following beneficial effects: the mounting frame provides a mounting base for other components; the upper end of the mounting frame has a mounting space; the end cap fits into the mounting space; the end cap can be fixed in the mounting space without additional fasteners, simplifying the overall structure of the monostable permanent magnet mechanism; the end cap is used to close the upper part of the mounting frame; the inner stationary iron core is located inside the mounting frame; there is a gap between the inner stationary iron core and the inner wall of the mounting frame; the magnetic attraction module includes a permanent magnet and a switching coil; the permanent magnet is located in the gap between the inner stationary iron core and the inner wall of the mounting frame; the permanent magnet has permanent magnetism; the inner stationary iron core is used to form a low magnetic resistance main magnetic circuit, guiding and concentrating magnetic flux; the switching coil is used to pass current, which generates a strong magnetic field; the inner stationary iron core provides a path with very low magnetic resistance for this magnetic field; the magnetic flux will preferentially pass through this iron core, forming a clear and concentrated "magnetic circuit"; the moving iron core slides along the axial direction of the switching coil; the magnetic flux is concentrated through the inner... After the stationary iron core is in place, a strong electromagnetic attraction is generated in the sliding space between the inner stationary iron core and the moving iron core. This electromagnetic attraction attracts the moving iron core, causing it to move towards the inner stationary iron core. The up-and-down sliding of the moving iron core is transmitted to the contacts of the vacuum interrupter through the pull rod, thereby completing the closing or opening operation of the circuit breaker. The lower end of the elastic element is fixedly set on the upper side of the end cover. The elastic element is used to provide an upward opening holding force for the moving iron core. The elastic element is set on the outside of the mounting frame, which saves the installation space when the elastic element is set inside the mounting frame in the traditional monostable permanent magnet mechanism. This makes the overall structure of the monostable permanent magnet mechanism more compact, saves the radial installation space of the monostable permanent magnet mechanism, and facilitates installation. Furthermore, setting the elastic element on the outside of the outer stationary iron core can avoid the elastic element being affected by the heating of the opening and closing coils, which may cause changes in its material properties or stress relaxation. Moreover, setting the elastic element on the outside of the mounting frame makes it easier to inspect or replace the elastic element.

[0007] According to some embodiments of the present invention, a limiting ring and a mounting platform are provided in the installation space, the upper surface of the end cap abuts against the limiting ring, and the lower surface of the end cap abuts against the mounting platform. The limiting ring and the mounting platform are used to limit the position of the end cap.

[0008] According to some embodiments of the present invention, a magnetic ring is provided between the outer stationary iron core and the end cap.

[0009] According to some embodiments of the present invention, a limiting space is provided inside the moving iron core, a limiting block is provided on the pull rod, the limiting block is disposed in the limiting space, and the upper surface of the limiting block abuts against the upper surface of the limiting space.

[0010] According to some embodiments of the present invention, the mounting bracket includes a bottom cover plate and an outer stationary iron core. The bottom cover plate is disposed on the lower side of the inner stationary iron core, the bottom cover plate is sleeved on the outer side of the pull rod, and the bottom cover plate is sleeved on the inner side of the outer stationary iron core. The bottom cover plate is used to install the inner stationary iron core and the permanent magnet.

[0011] According to some embodiments of the present invention, the outer stationary iron core is provided with a plurality of first through holes in its circumference, the bottom cover plate is provided with a plurality of first threaded holes in its circumference, and a first fastener fixes the bottom cover plate to the circumference of the outer stationary iron core through the first through holes and the first threaded holes.

[0012] According to some embodiments of the present invention, the present invention further includes a fixing plate disposed on the lower side of the bottom cover plate, the fixing plate being used to fix the external monostable permanent magnet mechanism of the opening spring to other components.

[0013] According to some embodiments of the present invention, the fixing plate is provided with a plurality of second through holes, the bottom cover plate is provided with a plurality of second threaded holes, and the second fastener fixes the fixing plate to the lower side of the bottom cover plate through the second through holes and the second threaded holes.

[0014] According to some embodiments of the present invention, both the first fastener and the second fastener are studs.

[0015] According to some embodiments of the present invention, the present invention further includes a spring seat, which is disposed on the upper side of the opening spring, and is sleeved on the outer side of the pull rod. The spring seat is fixedly disposed with the pull rod, and the spring seat is used to adjust the initial extension and retraction of the opening spring.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of an externally mounted monostable permanent magnet mechanism for opening the circuit breaker according to an embodiment of the present invention; Figure 2 for Figure 1 The front view shown; Figure 3 for Figure 1 The right view shown; Figure 4 for Figure 3 The cross-sectional view of AA is shown; Figure 5 for Figure 1 The bottom view shown; Figure 6 This is a schematic diagram of the structure of an externally mounted monostable permanent magnet mechanism for opening the circuit breaker during closing, according to an embodiment of the present invention. Figure 7 for Figure 6The cross-sectional view of BB is shown; Figure 8 This is a schematic diagram of the external static iron core of an externally mounted monostable permanent magnet mechanism for opening the gate spring, according to an embodiment of the present invention. Figure 9 for Figure 8 The cross-sectional view shown; Figure 10 This is a schematic diagram of the bottom cover plate of an externally mounted monostable permanent magnet mechanism for opening the gate spring, according to an embodiment of the present invention. Figure 11 This is a schematic diagram of the fixing plate of an externally mounted monostable permanent magnet mechanism for opening the gate spring, according to an embodiment of the present invention. Reference numerals: mounting bracket 100, mounting space 110, limiting ring 111, mounting platform 112, bottom cover plate 120, first threaded hole 121, second threaded hole 122, outer stationary iron core 130, first through hole 131; 200mm inner static iron core; Magnetic suction module 300, permanent magnet 310, opening and closing coil 320; End cap 400, sliding space 410; Pull rod 500, limit block 510; Moving iron core 600, limiting space 610; Elastic component 700; Magnetic ring 800; First fastener 900; Fixing plate 1000, second through hole 1010; Second fastener 1100; Spring seat 1200. Detailed Implementation

[0018] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0019] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0020] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0021] Reference Figures 1 to 11 This invention discloses an externally mounted monostable permanent magnet mechanism for tripping springs, comprising: a mounting frame 100, an inner stationary iron core 200, a magnetic suction module 300, an end cap 400, a pull rod 500, a moving iron core 600, and an elastic element 700. The mounting frame 100 is hollow, and an installation space 110 is provided at the upper end of the mounting frame 100. The mounting frame 100 is used to provide a mounting base for other components. The hollow mounting frame 100 is used to install other components. The installation space 110 is defined by two limiting structures. The upper and lower end faces of the end cap 400 are limited by the two limiting structures on the mounting frame 100. The radial direction of the end cap 400 is limited by the radial direction of the installation space 110. The installation space 110 uses limiting structures to restrict the position of the end cap 400, eliminating the need for additional connecting parts and connecting holes, thus simplifying the overall structure of the monostable permanent magnet mechanism. It should be noted that the end cap 400 can also be connected to the upper side of the mounting frame 100 using fasteners.

[0022] The inner stationary iron core 200 is fixed inside the mounting bracket 100, with a gap between the inner stationary iron core 200 and the inner wall of the mounting bracket 100. The inner stationary iron core 200 is used to form a low-resistivity main magnetic circuit, guiding and concentrating magnetic flux. When the opening and closing coil 320 is supplied with a first pulse current, a magnetic field with the same direction as the permanent magnet 310 is generated. The inner stationary iron core 200 provides a path with very low magnetic resistance for this magnetic field, and the magnetic flux will preferentially pass through this iron core, forming a clear and concentrated "magnetic circuit". After the magnetic flux passes through the inner stationary iron core 200, a strong electromagnetic attraction is generated at the working air gap between it and the moving iron core 600. This electromagnetic attraction will attract the moving iron core 600, causing it to slide towards the inner stationary iron core 200. This process converts the electrical and magnetic energy in the opening and closing coil 320 into the mechanical kinetic energy of the moving iron core 600. The inner stationary iron core 200 is usually made of a soft magnetic material with high magnetic permeability, such as silicon steel or industrial pure iron.

[0023] The magnetic attraction module 300 includes a permanent magnet 310 and a switching coil 320. The permanent magnet 310 is disposed in the gap between the inner stationary iron core 200 and the inner wall of the mounting frame 100. The switching coil 320 is disposed inside the mounting frame 100 and is located at the upper end of the permanent magnet 310. The switching coil 320 is energized to increase or decrease the magnetic attraction force of the magnetic attraction module 300. In the external monostable permanent magnet mechanism of the switching spring, the switching coil 320 mainly undertakes the key task of driving the moving iron core 600 to move and changing the magnetic field state. The switching coil 320 is a conventional setting and will not be described in detail.

[0024] The end cover 400 is disposed within the installation space 110. The end cover 400 and the inner cylinder of the opening and closing coil 320 define a sliding space 410. The end cover 400 is used to close the upper side of the mounting bracket 100.

[0025] The tie rod 500 passes through the end cap 400, sliding space 410, inner stationary iron core 200, and mounting bracket 100 sequentially from top to bottom. The tie rod 500 can slide in the vertical direction. The lower end of the tie rod 500 is used to connect the moving contact in the vacuum interrupter chamber. The tie rod 500 is used to connect other components in series. All other components are coaxially sleeved on the outside of the tie rod 500. It is understood that the tie rod 500 needs to withstand a certain tensile load. It is usually made of titanium alloy. Titanium alloy has sufficient structural strength and low density, which is suitable for high stress nodes. It has a relatively good balance between strength and weight. It should be noted that in some applications with stringent requirements for low heat leakage and lightweight, the tie rod 500 may also be made of some composite materials such as glass fiber / carbon fiber / Kevlar fiber + epoxy resin. The manufacturing material of the tie rod 500 needs to be selected by comprehensively considering the actual application and cost.

[0026] The moving iron core 600 is slidably disposed in the sliding space 410 along the axial direction of the opening and closing coil 320. The moving iron core 600 is fixed to the pull rod 500. The moving iron core 600 slides in the up and down direction, and the moving iron core 600 drives the pull rod 500 to slide in the up and down direction.

[0027] The elastic element 700 is located above the end cap 400. One end of the elastic element 700 is connected to the pull rod 500, and the other end of the elastic element 700 is connected to the end cap 400. The elastic element 700 is generally a coil spring or a leaf spring.

[0028] When the magnetic attraction force of the magnetic module 300 on the moving iron core 600 is less than the elastic restoring force of the elastic element 700 on the moving iron core 600, the moving iron core 600 slides upward. When the magnetic attraction force of the magnetic module 300 on the moving iron core 600 is greater than the elastic restoring force of the elastic element 700 on the moving iron core 600, the moving iron core 600 slides downward.

[0029] Specifically, when it is necessary to close the external monostable permanent magnet mechanism of the opening spring, the opening and closing coil 320 is supplied with a first pulse current. The magnetic field generated by the first pulse current is in the same direction as the magnetic field of the permanent magnet 310. The magnetic field generated by the first pulse current and the magnetic field of the permanent magnet 310 are superimposed to generate a downward magnetic force on the moving iron core 600, which is greater than the elastic force of the elastic element 700. The moving iron core 600 slides down and abuts against the inner stationary iron core 200 to complete the closing.

[0030] Specifically, when the external monostable permanent magnet mechanism of the opening spring needs to be opened, a second pulse current is passed through the opening and closing coil 320. The magnetic field generated by the second pulse current is opposite to the magnetic field of the permanent magnet 310. The magnetic field generated by the second pulse current and the magnetic field of the permanent magnet 310 are superimposed to produce a downward magnetic force on the moving iron core 600, which is less than the elastic force of the elastic element 700. The moving iron core 600 slides upward and abuts against the end cover 400 to complete the opening. The end cover 400 is used to limit the position of the moving iron core 600.

[0031] In some embodiments, a limiting ring 111 and a mounting platform 112 are provided on the mounting space 110. The upper surface of the end cover 400 abuts against the limiting ring 111, and the lower surface of the end cover 400 abuts against the mounting platform 112. The limiting ring 111 and the mounting platform 112 are used to limit the position of the end cover 400. The limiting ring 111 and the mounting platform 112 are used to limit the mounting position of the end cover 400 in the vertical direction. The peripheral wall of the outer stationary iron core 130 is used to limit the mounting position of the end cover 400 in its radial direction.

[0032] In some embodiments, a magnetic ring 800 is provided between the outer stationary iron core 130 and the end cover 400. The magnetic ring 800 is used to provide a channel for the external monostable permanent magnet mechanism of the trip spring. The magnetic ring 800 is a conventional setting and will not be described in detail.

[0033] In some embodiments, a limiting space 610 is provided within the moving iron core 600, and a limiting block 510 is provided on the pull rod 500. The limiting block 510 is disposed within the limiting space 610, and the upper surface of the limiting block 510 abuts against the upper surface of the limiting space 610. The limiting space 610 is used to cooperate with the limiting block 510 to fix the moving iron core 600 onto the pull rod 500. When the circuit is closed, the moving iron core 600 moves downward under the action of magnetic force. Since the upper surface of the limiting block 510 abuts against the upper surface of the limiting space 610, the pull rod 500 will move downward together with the moving iron core 600. When the circuit is opened, the pull rod 500 moves upward under the action of the elastic force provided by the elastic element 700, and the moving iron core 600 will move upward together with the pull rod 500 to realize the opening.

[0034] In some embodiments, the mounting bracket 100 includes a bottom cover plate 120 and an outer stationary iron core 130. The bottom cover plate 120 is disposed on the lower side of the inner stationary iron core 200, and is sleeved on the outer side of the pull rod 500 and the inner side of the outer stationary iron core 130. The bottom cover plate 120 is used to install the inner stationary iron core 200 and the permanent magnet 310. The bottom cover plate 120 is used to limit the position of the inner stationary iron core 200 and the permanent magnet 310 in the vertical direction. The bottom cover plate 120, the outer stationary iron core 130 and the end cover 400 cooperate to close the external monostable permanent magnet mechanism of the trip spring. The bottom cover plate 120 and the outer stationary iron core 130 are conventional settings and will not be described in detail.

[0035] In some embodiments, the outer stationary iron core 130 is provided with a plurality of first through holes 131 in the circumferential direction, and the bottom cover plate 120 is provided with a plurality of first threaded holes 121 in the circumferential direction. The first fastener 900 fixes the bottom cover plate 120 to the circumferential direction of the outer stationary iron core 130 through the first through holes 131 and the first threaded holes 121. The number of first through holes 131 and the number of first threaded holes 121 are the same and correspond one-to-one. The outer stationary iron core 130 and the bottom cover plate 120 are fixedly connected by the first fastener 900.

[0036] In some embodiments, the present invention further includes a fixing plate 1000, which is disposed on the lower side of the bottom cover plate 120. The fixing plate 1000 is used to fix the external monostable permanent magnet mechanism of the opening spring to other components. The shape of the fixing plate 1000 can be set according to actual installation requirements. The fixing plate 1000 is usually "U" shaped or "L" shaped. The fixing plate 1000 is a conventional setting and is not subject to additional limitations.

[0037] In some embodiments, the fixing plate 1000 is provided with a plurality of second through holes 1010, and the bottom cover plate 120 is provided with a plurality of second threaded holes 122. The second fastener 1100 fixes the fixing plate 1000 to the lower side of the bottom cover plate 120 through the second through holes 1010 and the second threaded holes 122. The number of second through holes 1010 and the second threaded holes 122 are the same and correspond one-to-one. The fixing plate 1000 is fixedly connected to the lower side of the bottom cover plate 120 by the second fastener 1100.

[0038] In some embodiments, the first fastener 900 and the second fastener 1100 are both studs. Stud connections facilitate frequent disassembly and provide great convenience for subsequent maintenance and parts replacement. The first fastener 900 and the second fastener 1100 can also be set as other fasteners such as bolts or screws.

[0039] In some embodiments, the present invention further includes a spring seat 1200, which is disposed on the upper side of the elastic member 700 and sleeved on the outer side of the pull rod 500. The spring seat 1200 is fixedly disposed with the pull rod 500 and is used to adjust the initial extension and retraction of the elastic member 700. The spring seat 1200 is provided with a pressure plate, a locking nut and a common nut. The pressure plate, the common nut and the locking nut are all sleeved on the pull rod 500. The pressure plate is used to balance the elastic force of the elastic member 700, and the locking nut and the common nut are used to fix the pressure plate on the spring seat 1200.

[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A monostable permanent magnet mechanism with an externally mounted opening spring, characterized in that, include: The mounting bracket (100) is hollow, and the upper end of the mounting bracket (100) is provided with an installation space (110). An inner stationary iron core (200) is fixed inside the mounting bracket (100), and there is a gap between the inner stationary iron core (200) and the inner wall of the mounting bracket (100); The magnetic attraction module (300) includes a permanent magnet (310) and a switching coil (320). The permanent magnet (310) is disposed in the gap between the inner stationary iron core (200) and the inner wall of the mounting frame (100). The switching coil (320) is disposed in the mounting frame (100) and is located at the upper end of the permanent magnet (310). The switching coil (320) is energized to increase or decrease the magnetic attraction force of the magnetic attraction module (300). An end cap (400) is disposed within the installation space (110), and the end cap (400) and the inner cylinder of the opening and closing coil (320) define a sliding space (410). A pull rod (500) passes through the end cap (400), the sliding space (410), the inner stationary iron core (200), and the mounting bracket (100) from top to bottom. The pull rod (500) can slide in the up and down direction. The lower end of the pull rod (500) is used to connect the moving contact in the vacuum interrupter chamber. The moving iron core (600) is slidably disposed in the sliding space (410) along the axial direction of the opening and closing coil (320), and the moving iron core (600) is fixed to the pull rod (500). An elastic element (700) is disposed above the end cap (400), one end of the elastic element (700) is connected to the pull rod (500), and the other end of the elastic element (700) is connected to the end cap (400). When the magnetic attraction force of the magnetic module (300) on the moving iron core (600) is less than the elastic restoring force of the elastic element (700) on the moving iron core (600), the moving iron core (600) slides upward; when the magnetic attraction force of the magnetic module (300) on the moving iron core (600) is greater than the elastic restoring force of the elastic element (700) on the moving iron core (600), the moving iron core (600) slides downward.

2. The externally mounted monostable permanent magnet mechanism for opening the gate spring according to claim 1, characterized in that, The installation space (110) is provided with a limiting ring (111) and a mounting platform (112). The upper surface of the end cap (400) abuts against the limiting ring (111), and the lower surface of the end cap (400) abuts against the mounting platform (112). The limiting ring (111) and the mounting platform (112) are used to limit the position of the end cap (400).

3. The externally mounted monostable permanent magnet mechanism for opening the gate spring according to claim 1, characterized in that, The moving iron core (600) is provided with a limiting space (610), and the pull rod (500) is provided with a limiting block (510). The limiting block (510) is located in the limiting space (610), and the upper surface of the limiting block (510) abuts against the upper surface of the limiting space (610).

4. The externally mounted monostable permanent magnet mechanism for opening the gate spring according to claim 1, characterized in that, The mounting bracket (100) includes a bottom cover plate (120) and an outer stationary iron core (130). The bottom cover plate (120) is disposed on the lower side of the inner stationary iron core (200). The bottom cover plate (120) is sleeved on the outer side of the pull rod (500) and the bottom cover plate (120) is sleeved on the inner side of the outer stationary iron core (130). The bottom cover plate (120) is used to install the inner stationary iron core (200) and the permanent magnet (310).

5. The externally mounted monostable permanent magnet mechanism for opening the gate spring according to claim 4, characterized in that, The outer stationary iron core (130) is provided with a plurality of first through holes (131) in the circumferential direction, and the bottom cover plate (120) is provided with a plurality of first threaded holes (121) in the circumferential direction. The first fastener (900) fixes the bottom cover plate (120) to the circumferential direction of the outer stationary iron core (130) through the first through holes (131) and the first threaded holes (121).

6. The externally mounted monostable permanent magnet mechanism for opening the gate spring according to claim 5, characterized in that, It also includes a fixing plate (1000), which is disposed on the lower side of the bottom cover plate (120) and is used to fix the external monostable permanent magnet mechanism of the opening spring to other components.

7. The externally mounted monostable permanent magnet mechanism for opening the gate spring according to claim 6, characterized in that, The fixing plate (1000) is provided with a plurality of second through holes (1010), and the bottom cover plate (120) is provided with a plurality of second threaded holes (122). The second fastener (1100) fixes the fixing plate (1000) to the lower side of the bottom cover plate (120) through the second through holes (1010) and the second threaded holes (122).

8. The externally mounted monostable permanent magnet mechanism for opening the gate spring according to claim 7, characterized in that, Both the first fastener (900) and the second fastener (1100) are studs.

9. A monostable permanent magnet mechanism with an externally mounted opening spring according to claim 8, characterized in that, A magnetic ring (800) is provided between the outer stationary iron core (130) and the end cover (400), and the magnetic ring (800) is located in the installation space (110).

10. The externally mounted monostable permanent magnet mechanism for opening the gate spring according to claim 1, characterized in that, It also includes a spring seat (1200), which is disposed on the upper side of the elastic element (700). The spring seat (1200) is sleeved on the outside of the pull rod (500). The spring seat (1200) is fixedly disposed with the pull rod (500). The spring seat (1200) is used to adjust the initial extension and retraction of the elastic element (700).

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