Microswitch protection device

Abstract

The invention provides a microswitch protection device which comprises a shell and a cover cap, an installation groove used for installing a microswitch is formed in the shell, the cover cap detachably covers a groove opening of the installation groove, an operation opening is formed in the side wall of the shell and penetrates through the side wall of the shell, and the microswitch protection device further comprises a shielding plate and first sealant. The shielding plate is detachably arranged in the shell and partially shields the operation opening, and the operation opening is filled with the first sealant. The operation opening is shielded by the shielding plate, so that a gap between the microswitch and the inner wall of the operation opening is reduced, the gap between the microswitch and the operation opening can be smoothly blocked by the first sealant, the sealing performance between the operation opening and the microswitch is improved, external rainwater is prevented from entering the operation opening, and the service life of the microswitch is prolonged. The protection performance of the microswitch is improved, the situation of short circuit or poor contact of the microswitch caused by water, dust and other impurities is prevented, and the fault rate of the microswitch is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electric power equipment, and in particular to a micro switch protection device. Background Art

[0002] Micro switches are often used in disconnectors in existing power transmission and distribution systems. When micro switches are arranged in different positions in disconnectors, their functions are also different. For example, when installed on disconnectors, they are used to monitor the status of the switch. When the disconnector is operated, the contacts of the micro switch will change state accordingly, thereby providing an electrical feedback signal of the mechanical action. This state feedback is particularly important for automated control systems, which can ensure the correct operation of the disconnector and system safety. Micro switches can also be used as auxiliary components of disconnectors to control the operation of remote or automatic control systems through their output signals. For example, the signal of the micro switch can trigger a relay or other control element to achieve remote control of the disconnector.

[0003] The isolating switch is generally installed outdoors, so it is easy to be corroded in rainy, snowy or windy weather. Once debris or rainwater enters the isolating switch, it is easy to cause the isolating switch to burn out or have poor contact and other faults, seriously affecting the normal operation of the high-voltage line. The more commonly used method is to install a protective shell for the micro switch, install the micro switch in the protective shell, and set an operating port on the protective shell so that the operating handle of the micro switch extends from the operating port. Due to the special structure of the micro switch operating handle, the operating port needs to be set relatively large. After the micro switch is installed, there is a large gap between the micro switch and the inner wall of the operating port. During use, raindrops splashing on the micro switch operating handle are easy to enter the micro switch along the operating handle, thereby causing a short circuit in the internal circuit of the micro switch and causing the micro switch to burn out. In addition, the large gap between the micro switch and the inner wall of the operating port may cause rainwater to float directly into the protective shell, and it cannot play a protective role. At present, the gap is sealed by glue at the construction site. However, because the gap is too large, it is easy to collapse when applying the glue, and a good sealing effect cannot be achieved.

[0004] In summary, there is an urgent need for a micro switch protection device to solve or at least partially solve the problems existing in the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a micro switch protection device, which aims to solve the problem that the existing micro switch is prone to water ingress during use, resulting in burnout or poor contact inside the micro switch. The specific technical solution is as follows:

[0006] A micro switch protection device comprises a shell and a cover, wherein a mounting groove for mounting a micro switch is arranged in the shell, the cover can be detachably covered on the notch of the mounting groove, the side wall of the shell is provided with an operating port, the operating port runs through the side wall of the shell, and further comprises a shielding plate and a first sealant, the shielding plate can be detachably arranged in the shell, and the shielding plate is arranged to partially shield the operating port, and the first sealant is filled in the operating port.

[0007] Preferably, it also includes a second sealant and a first fastener, the second sealant is arranged around the outer periphery of the notch of the installation groove, and the second sealant is arranged between the shell and the cover, and the cover is fixedly connected to the shell by the first fastener.

[0008] Preferably, a second fastener is further included, and the shell is provided with an elongated hole arranged along the height direction of the shell, the second fastener penetrates the elongated hole, and the shielding plate is fixedly connected to the shell through the second fastener.

[0009] Preferably, slots are provided on the inner wall of the shell, the slots are provided on both sides of the operation port, the slots are provided along the height direction of the shell, and the shielding plates are inserted into the slots.

[0010] Preferably, a connection port is provided on the shell, and the connection port passes through the side wall of the shell, and also includes a wire protection assembly, which includes a bellows, a connecting sleeve and a round nut. A through hole is provided in the connecting sleeve, and the two ends of the through hole are respectively connected to the inner and outer sides of the shell. A boss is provided at the first end of the connecting sleeve, and an external thread is provided at the second end of the connecting sleeve. The second end of the connecting sleeve is passed through the connection port and extends into the shell. The round nut is threadedly connected to the second end of the connecting sleeve so that the side wall of the shell is clamped between the boss and the round nut. One end of the bellows is inserted into the through hole of the connecting sleeve, and the other end of the bellows extends outward.

[0011] Preferably, the wire protection assembly further comprises a sealing gasket, which is sleeved on the connecting sleeve and arranged between the boss and the outer wall of the shell.

[0012] Preferably, a first mounting hole is arranged inside the shell, the first mounting hole is a through hole, and a plurality of first mounting holes are arranged.

[0013] Preferably, it also includes a gasket and a magnetic baffle. The gasket is fixedly connected to the inner wall of the shell, the inner hole of the gasket is arranged corresponding to the first mounting hole, the magnetic baffle is attracted to the gasket, and the magnetic baffle blocks the inner hole of the gasket. The gasket is a flexible gasket.

[0014] Preferably, a countersunk hole is provided on the gasket, and the magnetic baffle is embedded in the countersunk hole.

[0015] Preferably, an inclined plate inclined toward the housing is arranged on the cover, and the inclined plate is arranged around the cover.

[0016] Preferably, a groove is provided on one side of the shell body in contact with the second sealant, the groove is arranged around the notch of the mounting groove, and the second sealant is partially embedded in the groove.

[0017] Preferably, a sealing layer is fixed to one side of the shielding plate close to the inner wall of the shell, and the sealing layer is made of one material selected from rubber, silicone and polyurethane.

[0018] Preferably, the wire protection assembly further includes a third sealant, and the third sealant is filled between the corrugated tube and the connecting sleeve.

[0019] Preferably, a second mounting hole is further arranged in the shell, a plurality of second mounting holes are arranged, the second mounting holes are threaded holes, and the second mounting holes are blind holes.

[0020] The application of the technical solution of the present invention has the following beneficial effects:

[0021] The shielding plate covers the operating port, thereby reducing the gap between the microswitch and the inner wall of the operating port, so that the first sealant can smoothly seal the gap between the microswitch and the operating port, thereby improving the sealing between the operating port and the microswitch, preventing the entry of rainwater from the outside, improving the protection performance of the microswitch, and preventing the microswitch from short-circuiting or having poor contact due to impurities such as water and dust, thereby reducing the failure rate of the microswitch.

[0022] In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. Figure 1-Figure 10 , the present invention is further described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 It is a schematic diagram of the overall structure of a micro switch protection device of the present application;

[0025] Figure 2 This is one of the internal structure diagrams of a micro switch protection device of the present application;

[0026] Figure 3 yes Figure 2 Magnified view at A in the middle;

[0027] Figure 4 This is the second schematic diagram of the internal structure of a micro switch protection device of the present application;

[0028] Figure 5 yes Figure 4Magnified view at B in the middle;

[0029] Figure 6 This is one of the internal structure schematic diagrams of a micro switch protection device of the present application after a micro sensor is installed;

[0030] Figure 7 It is an exploded view of a micro switch protection device of the present application;

[0031] Figure 8 This is the second schematic diagram of the internal structure of a micro switch protection device of the present application after a micro sensor is installed;

[0032] Fig. 9 It is a schematic diagram of the internal structure of another embodiment of a micro switch protection device of the present application;

[0033] Fig.10 yes Fig. 9 Magnified view at center C.

[0034] Among them, 1. shell; 11. installation groove; 12. operation port; 13. groove; 14. long strip hole; 15. slot; 16. connection port; 17. first installation hole; 18. second installation hole; 19. support platform; 2. cover; 21. tilting plate; 3. shielding plate; 31. sealing layer; 4. first sealant; 5. second sealant; 6. first fastener; 7. second fastener; 8. wire protection assembly; 81. bellows; 82. connecting sleeve; 821. boss; 83. round nut; 84. third sealant; 85. sealing gasket; 9. washer; 91. countersunk hole; 10. magnetic baffle; 20. micro switch. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the present invention, the present invention will be described more fully below, and preferred embodiments of the present invention are provided. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] Example:

[0038] Micro switches 20 are often used in the control circuit of high-voltage lines. For example, the micro switch 20 is used to locate the position of the joystick in the isolating switch. During the installation process, the micro switch 20 needs to be installed in the housing 1 first, and the position of the housing 1 on the isolating switch is adjusted until the micro switch 20 is located at the set position on the isolating switch. At this time, the micro switch 20 plays a positioning role in the isolating switch, that is, when the joystick moves to the set position, it will push the operating arm of the micro switch 20 to rotate, so that the micro switch 20 is actuated, and the micro switch 20 sends a signal to the control circuit of the isolating switch, and the control circuit controls the joystick of the isolating switch to stop moving or change the moving direction.

[0039] See also Figure 1-Figure 10 The present embodiment provides a micro switch protection device, including a shell 1 and a cover 2. The shell 1 is provided with a mounting groove 11 for mounting a micro switch 20. The cover 2 is detachably covered on the notch of the mounting groove 11. The side wall of the shell 1 is provided with an operation port 12. The operation port 12 runs through the side wall of the shell 1. The shielding plate 3 and the first sealant 4 are also included. The shielding plate 3 is detachably arranged in the shell 1, and the shielding plate 3 is arranged to partially shield the operation port 12. The first sealant 4 is filled in the operation port 12.

[0040] It should be noted that due to the special structure of the operating arm of the micro switch 20 (the front end of the operating arm is provided with an upwardly protruding roller to reduce the friction during operation so as to achieve sensitive operation), the operating port 12 on the shell 1 needs to be set larger. After the micro switch 20 is installed in the shell 1, the gap between the operating arm of the micro switch 20 and the operating port 12 is larger, and rainwater can easily enter through the gap.

[0041] Specifically, when installing the micro switch 20, the micro switch 20 is placed in the installation groove 11 in the shell 1, and one end of the operating arm of the micro switch 20 is extended from the operating port 12, and the baffle plate 3 is installed in the shell 1. By moving the relative position of the baffle plate 3 and the operating port 12, the operating port 12 is blocked as much as possible by the baffle plate 3, that is, the gap between the micro switch 20 and the operating arm is reduced as much as possible, and then soft glue is applied to the gap to completely block the gap. After the soft glue solidifies, a first sealant 4 is formed, and the baffle plate 3 and the first sealant 4 are used to seal the gap together. Because the shielding plate 3 shields the operation port 12, the gap between the micro switch 20 and the inner wall of the operation port 12 is reduced, so that the first sealant 4 can smoothly block the gap between the micro switch 20 and the operation port 12, improve the sealing between the operation port 12 and the micro switch 20, prevent the entry of rainwater from the outside, improve the protection performance of the micro switch 20, prevent the micro switch 20 from short circuiting or poor contact due to impurities such as water and dust, and reduce the failure rate of the micro switch 20. If the shielding plate 3 is missing and glue is directly used for sealing, on the one hand, the gap is large, and the glue cannot form a stable support during the application process, which easily causes the glue to collapse during the application process, and cannot form a blockage for the gap, which makes it difficult to seal the gap and cannot achieve a good sealing effect. In addition, in order to adapt to the thermal expansion and contraction of the gap, soft glue is generally used, that is, the glue has a certain elasticity after solidification. If the gap is too large, the glue will have weak rigidity at the gap after solidification, and it is easy to deform greatly under the action of external force, causing the first sealant 4 to fall off, which is not conducive to sealing. The setting of the baffle plate 3 can provide support for the first sealant 4, thereby improving the overall rigidity of the first sealant 4 after the glue solidifies, thereby preventing the first sealant 4 from falling off.

[0042] As a preferred embodiment, it also includes a second sealant 5 and a first fastener 6. The second sealant 5 is arranged around the outer periphery of the groove of the installation groove 11, and the second sealant 5 is arranged between the shell 1 and the cover 2. The cover 2 is fixedly connected to the shell 1 by the first fastener 6.

[0043] Specifically, a groove 13 is provided on one side of the housing 1 that contacts the second sealant 5. The groove 13 is arranged around the notch of the mounting groove 11. The second sealant 5 is partially embedded in the groove 13. A plurality of grooves 13 are provided. In the present embodiment, the first fastener 6 is a bolt, and the cover 2 is locked on the housing 1 by the cooperation of the bolt and the nut. In some other embodiments, the first fastener 6 can also be a screw, a rivet or other component or structure that can play a fastening role. In the present embodiment, the second sealant 5 is formed by solidifying by on-site gluing. In some other embodiments, a flexible pad can be used instead. The flexible pad can be made of one of soft materials such as rubber, silicone, polyurethane, etc.

[0044] It can be understood that, by arranging the second sealant 5, after fastening the first fastener 6, the second sealant 5 is pressed between the cover 2 and the housing 1, and the gap between the cover 2 and the housing 1 is sealed by the second sealant 5, so as to prevent external rainwater from entering the housing 1 from the gap between the cover 2 and the housing 1, thereby playing a waterproof role. The second sealant 5 is formed by applying glue and solidifying the glue, and combined with the setting of the groove 13, the second sealant 5 is embedded in the groove 13, further improving the sealing effect.

[0045] As a preferred embodiment, a sealing layer 31 is fixed to one side of the shielding plate 3 close to the inner wall of the housing 1 , and the sealing layer 31 is made of one of rubber, silicone and polyurethane.

[0046] It can be understood that by setting the sealing layer 31, when the shielding plate 3 is attached to the inner wall of the shell 1, the sealing layer 31 abuts against the inner wall of the shell 1, thereby sealing the part of the operating port 12 covered by the shielding plate 3, preventing external rainwater from entering through the gap between the shielding plate 3 and the shell 1.

[0047] As a preferred embodiment, it further includes a second fastener 7 . The shell 1 is provided with an elongated hole 14 arranged along the height direction of the shell 1 . The second fastener 7 penetrates the elongated hole 14 . The shielding plate 3 is fixedly connected to the shell 1 via the second fastener 7 .

[0048] Specifically, the second fastener 7 is a screw, which passes through the long strip through hole to fix the shielding plate 3 to the inner wall of the shell 1 .

[0049] It can be understood that the shielding plate 3 can be easily disassembled and assembled by setting the second fastener 7, that is, after the operating arm of the micro switch 20 is inserted into the operating port 12, the shielding plate 3 can be easily installed in the housing 1 to partially block the larger operating port 12. The setting of the long strip through hole facilitates the position adjustment of the shielding plate 3 along the length direction of the long strip through hole, so that the shielding plate 3 can block the operating port 12 as much as possible. Even after the shielding plate 3 is installed, the gap between the micro switch 20 and the inner wall of the operating port 12 is minimized, so that the gap can be easily sealed with glue.

[0050] As a preferred embodiment, slots 15 are provided on the inner wall of the housing 1 . The slots 15 are provided on both sides of the operating port 12 . The slots 15 are provided along the height direction of the housing 1 . The shielding plate 3 is inserted into the slots 15 .

[0051] It can be understood that, through the setting of the slot 15, when the shielding plate 3 needs to be installed, it can be installed by simply inserting the shielding plate 3 into the slot 15, and the installation and removal can be quickly realized. And when the position of the shielding plate 3 needs to be adjusted, it is only necessary to adjust the relative position of the shielding plate 3 and the slot 15, which is convenient for adjustment. When the shielding plate 3 is inserted into the slot 15, the slot 15 and the shielding plate 3 are interference fit, that is, in the case of interference fit, the shielding plate 3 can be moved and positioned at any position of the slot 15.

[0052] As a preferred embodiment, the shell 1 is provided with a connection port 16, which passes through the side wall of the shell 1 and also includes a wire protection assembly 8, which includes a bellows 81, a connecting sleeve 82 and a round nut 83. A through hole is provided in the connecting sleeve 82, and the two ends of the through hole are respectively connected to the inner and outer sides of the shell 1. A boss 821 is provided at the first end of the connecting sleeve 82, and an external thread is provided at the second end of the connecting sleeve 82. The second end of the connecting sleeve 82 is passed through the connection port 16 and extends into the shell 1. The round nut 83 is threadedly connected to the second end of the connecting sleeve 82 so that the side wall of the shell 1 is clamped between the boss 821 and the round nut 83. One end of the bellows 81 is inserted into the through hole of the connecting sleeve 82, and the other end of the bellows 81 extends outward.

[0053] It should be noted that although there are wireless micro switches 20, wired micro switches 20 are the most widely used due to their low cost, good stability and low failure rate. The connection port 16 is provided to facilitate the connection line of the micro switch 20 to be led out from the housing 1.

[0054] It can be understood that the bellows 81 is arranged to protect the connection wire of the micro switch 20, and the bellows 81 is fixed by the connecting sleeve 82 and the round nut 83. When installing, the bellows 81 is first sleeved on the connection wire of the micro switch 20, the connecting sleeve 82 is inserted into the connection port 16, the round nut 83 is installed from the housing 1 and locked, the connection wire of the micro switch 20 is inserted into the housing 1 from the through hole of the connecting sleeve 82, and installed on the micro switch 20, and finally the bellows 81 is inserted into the through hole of the connecting sleeve 82.

[0055] As a preferred embodiment, the wire protection assembly 8 further includes a sealing gasket 85 , which is sleeved on the connecting sleeve 82 and arranged between the boss 821 and the outer wall of the housing 1 .

[0056] It can be known that by setting the sealing gasket 85, after tightening the round nut 83, the sealing gasket 85 is clamped between the outer wall of the shell 1 and the boss 821, thereby achieving sealing between the boss 821 and the shell 1 and preventing water from entering between the boss 821 and the shell 1.

[0057] As a preferred embodiment, the wire protection assembly 8 further includes a third sealant 84 , and the third sealant 84 is filled between the corrugated tube 81 and the connecting sleeve 82 .

[0058] It can be known that glue is filled between the bellows 81 and the connecting sleeve 82, and the glue forms a third sealant 84 after solidification. The third sealant 84 is used to seal the gap between the connecting sleeve 82 and the bellows 81 to prevent external rainwater from entering.

[0059] As a preferred embodiment, a first mounting hole 17 is arranged inside the housing 1. The first mounting hole 17 is a through hole, and a plurality of first mounting holes 17 are arranged.

[0060] It can be known that, through the provision of the first mounting hole 17, a bolt can be passed through the first mounting hole 17 (the bolt here is not within the protection scope of the present device), and the housing 1 can be conveniently fixed to the required position of the disconnector by the bolt. Multiple mounting holes are arranged to improve the stability of the housing 1 after installation. In addition, if only one bolt is installed, the housing 1 may rotate. Therefore, by providing multiple holes, multiple bolts can be conveniently installed to prevent the housing 1 from rotating.

[0061] As a preferred embodiment, it also includes a gasket 9 and a magnetic baffle 10. The gasket 9 is fixedly connected to the inner wall of the shell 1. The inner hole of the gasket 9 is arranged corresponding to the first mounting hole 17. The magnetic baffle 10 is attracted to the gasket 9, and the magnetic baffle 10 blocks the inner hole of the gasket 9. The gasket 9 is a flexible gasket.

[0062] Specifically, the gasket 9 is also made of magnetic material, such as magnetic rubber (which is a known material and is not an improvement on the material).

[0063] It can be known that during installation, the housing 1 is fixed to the frame of the disconnector by using external bolts to pass through the first mounting hole 17. When the bolts are tightened, the nuts on the bolts are pressed against the washers 9, thereby achieving sealing at the first mounting hole 17 to prevent rainwater from invading the first mounting hole 17.

[0064] Furthermore, a countersunk hole 91 is provided on the gasket 9 , and the magnetic blocking piece 10 is embedded in the countersunk hole 91 .

[0065] It can be known that a plurality of first mounting holes 17 are provided, but not every first mounting hole 17 is correspondingly installed with a bolt during installation. Therefore, in the case where no bolt is installed, the first mounting hole 17 is closed by means of suction and fixation by means of a magnetic baffle 10 to prevent external rainwater from invading the first mounting hole 17. The magnetic baffle 10 is positioned by means of a countersunk hole 91 to prevent the magnetic baffle 10 from moving and causing a poor seal on the first mounting hole 17. During manufacturing, each gasket 9 corresponds to a magnetic baffle 10. When a bolt needs to be installed in the first mounting hole 17 to fix the housing 1, the magnetic baffle 10 on the gasket 9 can be removed.

[0066] As a preferred embodiment, an inclined plate 21 inclined toward the housing 1 is arranged on the cover 2 , and the inclined plate 21 is arranged around the cover 2 .

[0067] It can be known that, because the cover 2 is often arranged on the top of the entire device during the installation process, the inclined plates 21 are arranged around the cover 2 to drain the rainwater, preventing the rainwater from flowing downward along the side walls of the cover 2 and the lower part of the cover 2 to the gap between the cover 2 and the shell 1.

[0068] As a preferred embodiment, a bearing platform 19 is protruded upward in the housing 1, and a second mounting hole 18 is provided on the bearing platform 19. In this embodiment, the second mounting hole 18 is a threaded hole, and the micro switch 20 is fixedly connected to the bearing platform 19 by screws and threaded holes. The second mounting hole 18 is a blind hole, which plays a role in preventing external rainwater from entering the housing 1. Of course, in some embodiments, the second mounting hole 18 can also be a through hole, and the micro switch 20 is fixed by a bolt passing through the through hole. A rubber pad is installed at one end of the bolt located outside the housing 1 to prevent external rainwater from entering the housing 1 from the second mounting hole 18.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A micro switch protection device, characterized in that: The invention comprises a housing (1) and a cover (2); a mounting groove (11) for mounting a micro switch (20) is arranged in the housing (1); the cover (2) is detachably covered on the notch of the mounting groove (11); an operating opening (12) is arranged on the side wall of the housing (1); the operating opening (12) penetrates the side wall of the housing (1); It also comprises a shielding plate (3) and a first sealant (4); the shielding plate (3) is detachably arranged in the shell (1), and the shielding plate (3) is arranged to partially shield the operating port (12); and the first sealant (4) is filled in the operating port (12).

2. A micro switch protection device according to claim 1, characterized in that: It also includes a second sealant (5) and a first fastener (6), wherein the second sealant (5) is arranged around the outer circumference of the slot of the installation slot (11), and the second sealant (5) is arranged between the shell (1) and the cover (2), and the cover (2) is fixedly connected to the shell (1) via the first fastener (6).

3. A micro switch protection device according to claim 1, characterized in that: It also includes a second fastener (7), the shell (1) is provided with an elongated hole (14) arranged along the height direction of the shell (1), the second fastener (7) is arranged to penetrate the elongated hole (14), and the shielding plate (3) is fixedly connected to the shell (1) via the second fastener (7).

4. A micro switch protection device according to claim 1, characterized in that: Slots (15) are provided on the inner wall of the shell (1), the slots (15) are provided on both sides of the operating port (12), the slots (15) are provided along the height direction of the shell (1), and the shielding plate (3) is inserted into the slots (15).

5. A micro switch protection device according to any one of claims 3-4, characterized in that: The housing (1) is provided with a connection port (16), and the connection port (16) is arranged through the side wall of the housing (1). The invention also comprises a wire protection assembly (8), wherein the wire protection assembly (8) comprises a bellows (81), a connecting sleeve (82) and a round nut (83); a through hole is provided in the connecting sleeve (82); two ends of the through hole are respectively connected to the inner and outer sides of the shell (1); a first end of the connecting sleeve (82) is provided with a boss (821); a second end of the connecting sleeve (82) is provided with an external thread; the second end of the connecting sleeve (82) is inserted into the wire connection port (16) and extends into the shell (1); the round nut (83) is threadedly connected to the second end of the connecting sleeve (82) so that the side wall of the shell (1) is clamped between the boss (821) and the round nut (83); one end of the bellows (81) is inserted into the through hole of the connecting sleeve (82); and the other end of the bellows (81) extends outward.

6. A micro switch protection device according to claim 5, characterized in that: The wire protection assembly (8) further comprises a sealing gasket (85), wherein the sealing gasket (85) is sleeved on the connecting sleeve (82), and the sealing gasket (85) is arranged between the boss (821) and the outer wall of the housing (1).

7. A micro switch protection device according to any one of claims 1 to 3, characterized in that: A first mounting hole (17) is arranged inside the housing (1); the first mounting hole (17) is a through hole, and a plurality of the first mounting holes (17) are arranged.

8. A micro switch protection device according to claim 7, characterized in that: It also comprises a gasket (9) and a magnetic baffle (10); the gasket (9) is fixedly connected to the inner wall of the shell (1); the inner hole of the gasket (9) is arranged corresponding to the first mounting hole (17); the magnetic baffle (10) is attracted to the gasket (9) and the magnetic baffle (10) blocks the inner hole of the gasket (9); and the gasket (9) is a flexible gasket.

9. A micro switch protection device according to claim 8, characterized in that: The gasket (9) is provided with a countersunk hole (91), and the magnetic baffle (10) is embedded in the countersunk hole (91).

10. A micro switch protection device according to any one of claims 1 to 3, characterized in that: An inclined plate (21) inclined toward the housing (1) is arranged on the cover (2), and the inclined plate (21) is arranged around the cover (2).

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