A dynamic spring armature component and a snap-on relay thereof

Abstract

The present invention discloses a movable spring armature component and a snap-fit ​​relay thereof. The movable spring armature component comprises an armature, an injection molded part, and a movable spring. The upper portion of the armature is provided with a mating portion for mating with the blade of a yoke of the relay's magnetic circuit portion. By mating with the yoke, one side of the armature can mate with the pole face of the iron core of the relay's magnetic circuit portion. Both sides of the armature are provided with a bent portion that bends away from one side of the armature. The injection molded part covers the other side and side faces of the armature and completely covers the bent portion to ensure a secure connection between the injection molded part and the armature. The present invention has the advantages of small component size, simple production and assembly, ease of automated production, minimal impact of cumulative assembly tolerances between multiple sets of movable springs, and good parameter consistency in mass production of finished relays.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, in particular to a movable spring armature component and a snap-on relay thereof. Background Art

[0002] A snap-action relay typically includes a moving spring and armature assembly. The moving spring and armature assembly assemble a moving spring and armature. The armature cooperates with the pole surface of the core in the magnetic circuit to drive the moving spring, causing the moving contact of the moving spring to contact the normally open static contact of the normally open static spring and / or to separate from the normally closed static contact of the normally closed static spring. In existing moving spring and armature assemblies, to achieve pressure-resistant isolation between the moving spring and armature, a plastic component for pressure-resistant isolation is installed between the moving spring and armature. Figure 1 This is a schematic diagram of the structure of the movable spring armature component of the prior art, as shown in FIG. Figure 1 As shown, the movable spring armature component includes an armature 101, a restoring spring 102, a plastic movable spring support 103, a movable spring 104, a plastic clamping block 105 and a rivet 106. The restoring spring 102 is L-shaped. When assembling, one side of the L-shaped restoring spring 102 is first riveted to the armature 101, and the other side of the L-shaped restoring spring 102 is used to fix the yoke of the magnetic circuit part of the relay, so that the armature 101 fits on the knife edge of the yoke and is in contact with the magnetic circuit. The movable spring support 103 is then placed on the armature 101, the movable spring 104 is placed in a fixed position on the movable spring support 103, and the clamping block 105 is placed on the movable spring 104. Finally, a rivet 106 is passed through the pre-designed through-hole to sequentially penetrate the clamping block 105, the movable spring 104, the movable spring support 103 and the armature 101, and riveted together to form a movable spring-armature component. The movable spring-armature component of the prior art has the following main disadvantages:

[0003] 1. The armature, movable spring, movable spring support and clamping block all need to have through-holes for rivets to pass through. This makes each component larger, and thus also makes the entire movable spring and armature component larger, which is not conducive to the miniaturization of relay products.

[0004] 2. The armature, movable spring, movable spring support, and clamping block need to be put together and then riveted, that is, multiple parts need to be riveted together. The positioning during assembly is complicated and is not suitable for automated production.

[0005] 3. This type of structure of the movable spring armature component is usually used for multiple groups of movable springs. However, the multiple groups of movable springs will be affected by the cumulative assembly tolerance, resulting in a large difference in the flatness of the movable springs, thus affecting the parameter consistency of mass production of the product. Summary of the Invention

[0006] The object of the present invention is to overcome the deficiencies of the prior art and provide a movable spring armature component and a snap-on relay thereof, which have the characteristics of small component size, simple production and assembly, easy automation of production, little influence of assembly cumulative tolerances between multiple sets of movable springs, and good parameter consistency in batch production of finished relays.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a movable spring armature component, including an armature, an injection molded part and a movable spring; the upper part of the armature is provided with a mating portion for mating with the blade of the yoke of the magnetic circuit part of the relay, and through mating with the yoke, one side of the armature can be mated with the pole surface of the iron core of the magnetic circuit part of the relay; both sides of the armature are respectively provided with a bending portion bent in a direction away from one side of the armature, the injection molded part covers the other side and side surfaces of the armature to retain one side of the armature so that it can maintain mating with the pole surface of the iron core, and the injection molded part is completely covered by the bending portion so that the injection molded part can be firmly combined with the armature; the injection molded part also completely covers the top of the movable spring.

[0008] The movable spring armature component also includes a restoring spring; the restoring spring is L-shaped, and one side of the L-shaped restoring spring is riveted and fixed to the armature; in the injection molded part, on the other side corresponding to the armature, there is also a notch for making way for the restoring spring and an un-injected part for making way for the matching part of the yoke.

[0009] A first through hole is further provided in the bent portion of the armature, and the injection molded part completely fills the first through hole in the bent portion of the armature.

[0010] A second through hole is provided on the top of the movable spring, and the second through hole of the movable spring is completely filled with the injection molded part.

[0011] Both sides of the upper middle portion of the armature are provided with wings protruding outwards, the inner edges of the wings are provided with slits extending upwards from the bottom ends, and the lower portion of the wings is bent upwards by the slits to form a bent portion of the armature.

[0012] The bent portion is bent at 90 degrees or close to 90 degrees relative to the wing.

[0013] The movable springs are divided into two groups; each group of movable springs includes a movable spring piece, an electrical bridge piece and a movable contact; the second through-hole is provided at the top of the movable spring piece, and the top of the movable spring piece is directly below the bent portion of the armature; the middle of the electrical bridge piece is fixedly connected to the bottom of the movable spring piece, and the two movable contacts are respectively fixedly connected to the two ends of the electrical bridge piece; the electrical bridge piece is placed on one side of the movable spring piece, and one side of the movable spring piece is in the same direction as the other side of the armature.

[0014] A snap-on relay comprises the above-mentioned movable spring armature component.

[0015] A snap-action relay comprises a base, a normally closed static spring, and the aforementioned movable spring-armature component; the normally closed static spring is mounted on the base, and the movable spring-armature component is mounted on the base via a magnetic circuit portion of the relay, so that a movable contact in the movable spring-armature component corresponds to and cooperates with a normally closed static contact of the normally closed static spring; a first attracting member is further provided in the base near the normally closed static contact; a second attracting member capable of attracting and cooperating with the first attracting member is provided in the injection molded part of the movable spring-armature component; when the movable contact of the movable spring-armature component contacts the normally closed static contact of the normally closed static spring, the second attracting member of the movable spring-armature component attracts and cooperates with the first attracting member of the base to increase static contact pressure.

[0016] The first adsorption component is a magnet, the second adsorption component is also a magnet, and the polarities of the magnets on the opposite sides of the first adsorption component and the second adsorption component are set to be opposite; or the first adsorption component is a magnet, and the second adsorption component is an iron material; or the second adsorption component is a magnet, and the first adsorption component is an iron material.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention employs a configuration in which bent portions are provided on both sides of the armature, each bent in a direction away from one side of the armature. The injection molded part covers the other side and side of the armature, preserving one side of the armature so that it can mate with the core pole surface. The injection molded part completely covers the bent portions, ensuring a secure connection between the injection molded part and the armature. The injection molded part also includes an unmolded portion on the other side of the armature, which allows for the mating portion of the yoke. The injection molded part also completely covers the top of the movable spring. This structure of the present invention, by providing bent portions on both sides of the armature, effectively bonds the injection molded part to the armature. The armature and movable spring are integrally molded using the injection molded part, achieving pressure-resistant isolation between the armature and movable spring while also offering advantages such as small component size, simple production and assembly, ease of automated production, minimal impact of cumulative assembly tolerances between multiple sets of movable springs, and high parameter consistency in mass-produced finished relays.

[0019] 2. The present invention employs a first through-hole in the bent portion of the armature, allowing the injection molded part to completely fill the first through-hole in the bent portion of the armature; and a second through-hole in the top portion of the movable spring, allowing the injection molded part to completely fill the second through-hole in the movable spring. This structure, utilizing both the first and second through-holes, enhances the securing strength between the plastic part, the armature, and the movable spring.

[0020] 3. The present invention employs outwardly projecting wings on either side of the upper middle portion of the armature. The inner edges of these wings are provided with slits extending upward from their bottom ends. The lower portions of these wings are bent upward using these slits to form the armature's bent portion, and the top of the movable spring is positioned directly below the armature's bent portion. This structure allows the armature's bent portion to be positioned approximately horizontally. This allows the movable spring to freely adjust its distance from the armature, ensuring sufficient insulation and creepage distances. It also facilitates the manufacture of injection molds.

[0021] 4. The present invention employs a bridge piece placed on one side of the movable spring, with one side of the movable spring oriented in the same direction as the other side of the armature. This structure allows the bridge piece to be located on the side of the movable spring facing the normally closed end, thereby adjusting the swing arm of the movable spring, thereby increasing the contact pressure at the normally closed end and preventing vibration.

[0022] 5. The present invention employs a first attracting element provided in the base near the normally closed static contact. The injection-molded component of the movable spring-armature assembly is provided with a second attracting element capable of engaging with the first attracting element. When the movable contact of the movable spring-armature assembly contacts the normally closed static contact of the normally closed static spring, the second attracting element engages with the first attracting element of the base. This structure of the present invention, through the combined attraction of the first and second attracting elements, can increase the contact force of the normally closed contact and the rated load of the statically closed contact, thereby enhancing relay performance. Furthermore, by adjusting the attraction force between the first and second attracting elements, a good match between the statically closed contact pressure and the dynamically closed contact pressure can be achieved.

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the movable spring armature component and the snap-on relay thereof of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the movable spring armature component of the prior art;

[0025] Figure 2 1 is a schematic diagram of the three-dimensional structure of the movable spring armature component of the first embodiment of the present invention;

[0026] Figure 3 1 is a schematic exploded perspective view of the movable spring armature component according to the first embodiment of the present invention;

[0027] Figure 4 1 is a rear view of the movable spring armature component of the first embodiment of the present invention;

[0028] Figure 5 It is along Figure 4The cross-sectional view of line AA in FIG;

[0029] Figure 6 1 is a schematic diagram of the three-dimensional structure of the snap-on relay according to the first embodiment of the present invention (excluding the housing);

[0030] Figure 7 1 is a schematic exploded perspective view of the three-dimensional structure of the snap-on relay according to the first embodiment of the present invention (excluding the housing);

[0031] Figure 8 1 is a schematic diagram of the three-dimensional structure of the snap-on relay according to the second embodiment of the present invention (excluding the housing);

[0032] Figure 9 is a partially exploded schematic diagram of the three-dimensional structure of a snap-on relay according to a second embodiment of the present invention;

[0033] Figure 10 1 is a partially exploded schematic diagram of the three-dimensional structure of the snap-on relay according to the second embodiment of the present invention (the first adsorption member and the second adsorption member are not installed). DETAILED DESCRIPTION

[0034] Example 1

[0035] See also Figures 2 to 5 As shown, a movable spring armature component of the present invention, the movable spring armature component 30 includes an armature 2, a restoring spring 1, an injection molded part 3 and a movable spring 4; the restoring spring 1 is L-shaped, and the upper part of the armature 2 is provided with a mating portion 21 for mating with the knife edge of the yoke of the magnetic circuit part of the relay; one side 11 of the L-shaped restoring spring 1 is riveted to the armature 2, and one side 22 of the armature 2 is able to mate with the iron core pole surface of the magnetic circuit part of the relay, and the other side 12 of the L-shaped restoring spring 1 is used to be fixed to the yoke of the magnetic circuit part of the relay; the two sides of the armature 2 are respectively A bent portion 23 is provided that is bent in a direction away from the side of the armature. The injection molded part 3 covers the other side 24 of the armature 2 and its side surface to retain the one side 22 of the armature so that it can maintain cooperation with the iron core pole surface. The injection molded part 3 is completely covered by the bent portion 23 so that the injection molded part 3 can be firmly combined with the armature 2; in the injection molded part 3, on the other side 24 corresponding to the armature 2, there are also provided a notch 31 that makes way for the restoring spring and an uninjected portion 32 that makes way for the cooperation portion of the yoke; the injection molded part 3 also completely covers the top of the dynamic spring 4.

[0036] In this embodiment, a first through hole 231 is further defined in the bent portion 23 of the armature 2 , and the first through hole 231 of the bent portion 23 of the armature 2 is completely filled with the injection molded part 3 .

[0037] In this embodiment, a second through hole 41 is provided on the top of the dynamic spring 4 , and the second through hole 41 of the dynamic spring is completely filled with the injection molded part 3 .

[0038] In this embodiment, wings 25 protruding outward are respectively provided on both sides of the upper middle part of the armature 2, and the inner edge of the wing 25 is provided with a slit 26 extending upward from the bottom end. The lower part of the wing 25 is bent upward by the slit 26 to form the bending portion 23 of the armature.

[0039] In this embodiment, the bent portion 23 is bent at 90 degrees or close to 90 degrees relative to the wing 25 .

[0040] In this embodiment, the movable springs 4 are divided into two groups; each group of movable springs 4 includes a movable spring piece 42, an electrical bridge piece 43 and a movable contact 44; the second through hole 41 is provided at the top of the movable spring piece 42, and the top of the movable spring piece 42 is directly below the bent portion 23 of the armature 2; the middle of the electrical bridge piece 43 is fixedly connected to the bottom of the movable spring piece 42, and the two movable contacts 44 are respectively fixedly connected to the two ends of the electrical bridge piece 43.

[0041] In this embodiment, the electrical bridge piece 43 is placed on one side of the movable spring piece 42 , and one side of the movable spring piece 42 is facing the same direction as the other side 24 of the armature 2 .

[0042] See also Figures 2 to 7 As shown, a snap-action relay of the present invention includes a base 5, a normally closed static spring 6, a normally open static spring 7, a magnetic circuit portion 8 and the movable spring-armature component 30; the normally closed static spring 6 and the normally open static spring 7 are respectively mounted on the base 5 and are in corresponding states, two normally closed static springs 6 and two normally open static springs 7 form a group, four normally closed static springs 6 and four normally open static springs 7 respectively cooperate with the two groups of movable springs 4, the magnetic circuit portion 8 is mounted on the base via a yoke 81 and a coil frame 82, the other L-shaped side 12 of the restoring spring 1 of the movable spring-armature component 30 is fixed to the yoke 81 of the magnetic circuit portion 8, and the matching portion 21 of the armature 2 is matched with the knife edge of the yoke 81, one side 22 of the armature 2 is matched with the iron core pole surface 83 of the magnetic circuit portion 8, and the movable contact 44 in the movable spring-armature component 30 is matched with the normally closed static contact 61 of the normally closed static spring 6 and the normally open static contact 71 of the normally open static spring 7 respectively.

[0043] A movable spring armature component and a snap-on relay thereof of the present invention adopt a configuration in which bent portions 23 are provided on both sides of the armature 2, each bent in a direction away from one side of the armature. The injection molded part 3 covers the other side 24 and side surfaces of the armature to retain one side 22 of the armature so that it can maintain cooperation with the core pole surface 83. The injection molded part 3 is completely covered by the bent portion 23 so that the injection molded part 3 can be firmly combined with the armature 2. In the injection molded part 3, a notch 31 is provided on the other side 24 corresponding to the armature to make way for the restoring spring leaf and an unmolded portion 32 is provided to make way for the cooperation portion of the yoke. The injection molded part 3 also completely covers the top of the movable spring 4. This structure of the present invention provides a bending portion 23 on both sides of the armature 2, so that the injection molded part 3 and the armature 2 can be effectively combined together. In the snap-fit ​​structure, the armature needs to cooperate with the pole surface of the iron core, so the side where the armature cooperates with the pole surface of the iron core is not suitable for injection molding of plastic parts. The thickness of the plastic part on this side is too thin and it is easy to fall off during demolding, resulting in insufficient fixing strength; if the injection molding is too thick, it will interfere with the coil frame during snap-fit ​​rotation; the present invention solves the problem of combining the injection molded part and the armature through the bending portion 23, and uses the injection molded part 3 to injection mold the armature 2 and the dynamic spring 4 into one, which not only realizes the pressure-resistant isolation between the armature 2 and the dynamic spring 4, but also has the characteristics of small component size, simple production and assembly, easy to realize automated production, little influence of assembly cumulative tolerance between multiple groups of dynamic springs, and good parameter consistency of batch production of finished relays.

[0044] The present invention's movable spring-armature assembly and its snap-action relay utilize a first through-hole 231 in the bent portion 23 of the armature 2, allowing the molded part 3 to completely fill the first through-hole 231. Furthermore, a second through-hole 41 is provided at the top of the movable spring 4, allowing the molded part 3 to completely fill the second through-hole 41. This structure, utilizing the first through-hole 231 and the second through-hole 41, enhances the securing strength between the plastic part 3, the armature 2, and the movable spring 4.

[0045] The present invention employs a movable spring armature assembly and its associated snap-action relay, each with outwardly projecting tabs 25 on either side of the upper middle portion of the armature 2. The inner edges of these tabs 25 are provided with slits 26 extending upward from their bottom ends. The lower portions of these tabs 25 are bent upwardly by the slits 26 to form the armature's bent portion 23. The top of the movable spring tab 42 is positioned directly below the bent portion 23 of the armature 2. This structure allows the bent portion 23 of the armature 2 to be positioned approximately horizontally. This allows the movable spring 4 to freely adjust its distance from the armature 2, ensuring sufficient insulation and creepage distances. It also enhances the manufacturability of the injection mold. Furthermore, the plastic filling the slits 26 also enhances the securing strength between the plastic component 3 and the armature 2.

[0046] The present invention's movable spring-armature assembly and snap-action relay employ an electrical bridge 43 that rests on one side of the movable spring 42, with one side of the movable spring 42 oriented in the same direction as the other side 24 of the armature 2. This structure allows the bridge 43 to be located on the side of the movable spring facing the normally closed end, adjusting the movable spring's swing arm and thereby increasing contact pressure at the normally closed end, preventing vibration.

[0047] Example 2

[0048] See also Figures 8 to 10 As shown, a movable spring-armature component and a snap-on relay thereof according to the present invention differ from those of the first embodiment in that a first suction member 91 is further provided in the base 5 near the normally closed static contact 61; a second suction member 92 capable of being attracted and coordinated with the first suction member 91 is provided in the injection molded part 3 of the movable spring-armature component 30. When the movable contact 44 of the movable spring-armature component contacts the normally closed static contact 61 of the normally closed static spring 6, the second suction member 92 of the movable spring-armature component 30 is attracted and coordinated with the first suction member 91 of the base 5 to increase the static contact pressure.

[0049] In this embodiment, the first adsorbing member 91 is a magnet, and the second adsorbing member 92 is also a magnet. The polarity of the magnets on the opposing sides of the first adsorbing member 91 and the second adsorbing member 92 is set to be opposite. Of course, one of the first adsorbing member and the second adsorbing member can be made of a magnet and the other of a ferrous material. For example, the first adsorbing member can be a magnet and the second adsorbing member can be made of a ferrous material; or the second adsorbing member can be a magnet and the first adsorbing member can be made of a ferrous material.

[0050] In this embodiment, the base 5 is further provided with a protrusion 51 near the normally closed static contact 61, and the first suction member 91 is disposed in the protrusion 51. The purpose of providing the protrusion 51 is to allow the first suction member 91 in the base to better cooperate with the second suction member 92 in the movable spring armature component 30.

[0051] In this embodiment, the convex column 51 of the base is provided with a first groove 52, and the first adsorption member 91 is inserted into the first groove 52 of the base 5 by interference fit. Of course, the first adsorption member can also be provided in the convex column of the base by injection molding.

[0052] In this embodiment, the injection molded part 3 is provided with a second groove 33, and the second adsorption member 92 is inserted into the second groove 33 of the injection molded part 3 by interference fit. Of course, the second adsorption member can also be provided in the injection molded part by injection molding.

[0053] The present invention relates to a movable spring-armature component and a snap-on relay thereof. A first attracting member 91 is provided in the base 5 near the normally closed static contact 61. A second attracting member 92 capable of engaging with the first attracting member is provided in the injection molded part 3 of the movable spring-armature component 30. When the movable contact 44 of the movable spring-armature component 30 contacts the normally closed static contact 61 of the normally closed static spring 6, the second attracting member 92 of the movable spring-armature component 30 engages with the first attracting member 91 of the base 5. This structure of the present invention, through the engaging and engaging interaction of the first attracting member 91 and the second attracting member 92, can increase the contact force of the normally closed end and the rated load of the statically closed contact end, thereby improving the performance of the relay. Furthermore, by adjusting the attracting force between the first and second attracting members, a good match between the statically closed contact pressure and the dynamically closed contact pressure can be achieved.

[0054] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent equivalent embodiment. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A movable spring armature assembly comprising an armature, an injection molded part, and a movable spring; the upper portion of the armature is provided with a mating portion for mating with a knife edge of a yoke of a relay's magnetic circuit portion. By mating with the yoke, one surface of the armature can mate with a pole face of an iron core of the relay's magnetic circuit portion; characterized in that: The lower ends of both sides of the upper and middle part of the armature are respectively provided with bent portions bent in the direction away from the side of the armature, and the injection molded part covers the other side and side surfaces of the armature to keep the side of the armature that cooperates with the iron core completely exposed to the injection molded part so that it can maintain cooperation with the pole surface of the iron core, and the injection molded part is completely covered by the bent portion so that the injection molded part can be firmly combined with the armature; the movable springs are divided into two groups, and the injection molded part also completely covers the top of each group of movable springs, and the injection molded part does not protrude from the side of the armature that cooperates with the iron core; the top of each group of movable springs is located directly below the corresponding bent portion of the armature, and the movable spring and the bent portion are arranged at an interval.

2. The movable spring armature component according to claim 1, characterized in that: The movable spring armature component also includes a restoring spring; the restoring spring is L-shaped, and one side of the L-shaped restoring spring is riveted and fixed to the armature; in the injection molded part, on the other side corresponding to the armature, there is also a notch for making way for the restoring spring and an un-injected part for making way for the matching part of the yoke.

3. The movable spring armature component according to claim 1, characterized in that: A first through hole is further provided in the bent portion of the armature, and the injection molded part completely fills the first through hole in the bent portion of the armature.

4. The movable spring armature component according to claim 1, characterized in that: A second through hole is provided on the top of the movable spring, and the second through hole of the movable spring is completely filled with the injection molded part.

5. The movable spring armature component according to claim 4, characterized in that: Both sides of the upper middle portion of the armature are provided with wings protruding outwards, the inner edges of the wings are provided with slits extending upwards from the bottom ends, and the lower portion of the wings is bent upwards by the slits to form a bent portion of the armature.

6. The movable spring armature component according to claim 5, characterized in that: The bent portion is bent at 90 degrees or close to 90 degrees relative to the wing.

7. The movable spring armature component according to claim 5 or 6, characterized in that: Each group of dynamic springs includes a dynamic spring piece, an electrical bridge piece and a dynamic contact; the second through hole is provided at the top of the dynamic spring piece; the middle of the electrical bridge piece is fixedly connected to the bottom of the dynamic spring piece, and the two dynamic contacts are respectively fixedly connected to the two ends of the electrical bridge piece; the electrical bridge piece is placed on one side of the dynamic spring piece, and one side of the dynamic spring piece is in the same direction as the other side of the armature.

8. A snap-on relay, characterized in that: The invention comprises a movable spring armature component according to any one of claims 1 to 7.

9. A snap-on relay, characterized in that: It comprises a base, a normally closed static spring and a movable spring-armature component as claimed in any one of claims 1 to 7; the normally closed static spring is mounted on the base, and the movable spring-armature component is mounted on the base through the magnetic circuit portion of the relay, so that the movable contact in the movable spring-armature component corresponds to and cooperates with the normally closed static contact of the normally closed static spring; a first adsorption member is further provided in the base near the normally closed static contact; a second adsorption member capable of adsorption-cooperating with the first adsorption member is provided in the injection-molded part of the movable spring-armature component, and when the movable contact of the movable spring-armature component contacts the normally closed static contact of the normally closed static spring, the second adsorption member of the movable spring-armature component adsorption-cooperates with the first adsorption member of the base to increase the static contact pressure.

10. The snap-on relay according to claim 9, characterized in that: The first adsorption member is a magnet, the second adsorption member is also a magnet, and the polarities of the magnets on the opposite sides of the first adsorption member and the second adsorption member are set to be opposite; or the first adsorption member is a magnet, and the second adsorption member is an iron material; Alternatively, the second adsorption component is a magnet, and the first adsorption component is an iron material.

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