Magnetic proximity switch

Abstract

The utility model discloses a kind of magnetic proximity switches, including protective shell, protective shell inside is equipped with dry Reed tube, dry Reed tube two ends are connected with lead, dry Reed tube outside is equipped with limiting mechanism, limiting mechanism includes the fixed sleeve of dry Reed tube outside, the fixed sleeve both sides are connected with fixed plate, protective shell inside is connected with fixed stake, fixed stake top end is connected with elastic buckle, fixed plate is equipped with clamping groove, elastic buckle is matched with clamping groove, the utility model is equipped with limiting mechanism by dry Reed tube outside, including the fixed sleeve of dry Reed tube outside, the fixed sleeve both sides are connected fixed plate, protective shell is equipped with the fixed stake with elastic buckle in, elastic buckle is matched with the clamping groove on fixed plate. Through the structure, dry Reed tube can be quickly, accurately pre-fixed before potting, ensure that its position and attitude in protective shell keep consistent, avoid deviation caused by resin flow or vibration, ensure the consistency of switch trigger distance and the stability between product batches.

Description

Technical Field

[0001] This utility model relates to the field of magnetic proximity switch technology, and more specifically, to a magnetic proximity switch. Background Technology

[0002] Magnetic proximity switches, as a type of non-contact position detection sensor, are widely used in industrial automation, mechanical equipment, pneumatic systems, and safety protection. Their working principle is primarily based on magnetic field induction, controlling the on / off state of the switch by the proximity or distance of an external magnet. Among them, magnetic proximity switches using a reed switch as the core sensing element are one of the most widely used types due to their simple structure, fast response speed, low power consumption, and lack of power supply requirements.

[0003] However, in existing technologies, reed switches are typically encapsulated in plastic boxes or epoxy resin using a potting process to achieve electrical insulation, dust and water resistance, and some mechanical protection. While this encapsulation method improves the product's environmental adaptability to some extent, it still reveals many technical defects in practical applications. A particularly prominent problem is the lack of precise limiting and fixing structures for the reed switch's positioning within the box. Often, it relies solely on the adhesive force of the resin or simple supports for rough fixation, leading to the reed switch being prone to offset, tilting, or even slight displacement during potting. This unstable positioning directly affects the magnetic field sensitivity and consistency of the switching distance. Due to the non-fixed position of the reed switch, switches from different products or even within the same batch may exhibit significant deviations in trigger distance during actual use. Some switches may conduct even when the magnet is far away, while others require the magnet to be very close to activate, severely impacting the stability and reliability of the control system. Utility Model Content

[0004] In view of the problems in the related technologies, this utility model proposes a magnetic proximity switch to overcome the above-mentioned technical problems existing in the existing related technologies.

[0005] Therefore, the specific technical solution adopted by this utility model is as follows:

[0006] A magnetic proximity switch includes a protective housing, a reed switch inside the protective housing, leads connected to both ends of the reed switch, a limiting mechanism outside the reed switch, a fixing sleeve fitted on the outside of the reed switch, fixing plates connected to both sides of the fixing sleeve, a fixing post connected inside the protective housing, an elastic buckle connected to the top of the fixing post, and a slot on the fixing plate, the elastic buckle matching the slot.

[0007] Furthermore, to reduce the impact of external vibrations on the reed switch, a soft pad is connected inside the fixing sleeve.

[0008] Furthermore, the fixing posts, anchor posts, and elastic clips are all made of plastic.

[0009] Furthermore, to improve sealing performance and prevent moisture and dust from entering the interior, the top of the protective shell is connected to the sealing cover by bolts, and a sealing gasket is connected to the bottom of the sealing cover.

[0010] Furthermore, the protective housing has connection terminals on both sides inside, and the connection terminals are connected to the leads by welding.

[0011] Furthermore, to further secure the reed switch, the interior of the protective housing is filled with rigid epoxy resin.

[0012] Furthermore, in order to install the protective shell, mounting plates are connected to both sides of the protective shell, and mounting holes are provided on the mounting plates.

[0013] The beneficial effects of this utility model are as follows:

[0014] (1) By setting a limiting mechanism on the outside of the reed switch, including a fixing sleeve fitted on the outside of the reed switch, fixing plates connected to both sides of the fixing sleeve, and fixing posts with elastic buckles set inside the protective shell, the elastic buckles matching the slots on the fixing plates. Through this structure, the reed switch can be quickly and accurately pre-fixed before potting, ensuring that its position and posture inside the protective shell remain consistent, avoiding displacement caused by resin flow or vibration, thereby ensuring the consistency of the switch triggering distance and the stability between product batches.

[0015] (2) By setting a soft pad (such as a rubber or silicone pad) inside the fixed sleeve, the soft pad makes flexible contact with the outer wall of the reed switch, which can absorb and buffer external mechanical vibration and impact during equipment operation. This design avoids the direct transmission of vibration energy to the glass tube of the reed switch, significantly reducing the risk of glass breakage or abnormal contact due to vibration, and improving the reliability and durability of the product in high-vibration industrial environments. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a front view of a magnetic proximity switch according to an embodiment of the present utility model;

[0018] Figure 2 This is a top view of the interior of a magnetic proximity switch protective housing according to an embodiment of the present utility model;

[0019] Figure 3 This is a structural diagram of the internal structure of a protective housing for a magnetic proximity switch according to an embodiment of the present utility model;

[0020] Figure 4 yes Figure 3 Enlarged schematic diagram of the structure at point A in the middle;

[0021] Figure 5 This is an installation diagram of a magnetic proximity switch fixing sleeve according to an embodiment of the present utility model.

[0022] In the picture:

[0023] 1. Protective housing; 2. Reed switch; 3. Lead wire; 4. Limiting mechanism; 401. Fixing sleeve; 402. Fixing post; 403. Elastic buckle; 404. Fixing plate; 405. Slot; 5. Soft pad; 6. Sealing cover; 7. Sealing gasket; 8. Connecting terminal; 9. Mounting plate; 10. Mounting hole. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] According to an embodiment of the present invention, a magnetic proximity switch is provided.

[0026] like Figures 1-5As shown, the magnetic proximity switch according to an embodiment of the present invention includes a protective housing 1, and a reed switch 2 is provided inside the protective housing 1. The reed switch 2 is a passive electronic switch that works based on the principle of magnetic field induction. Two iron-nickel alloy reed contacts are encapsulated in its glass tube. When an external permanent magnet approaches, the reeds are magnetized and attract each other to close, thereby realizing circuit conduction. When the magnet moves away, the reeds rely on their own elasticity to reset and separate, cutting off the circuit. The two ends of the reed switch 2 are respectively connected to lead wires 3. A limiting mechanism 4 is provided on the outside of the reed switch 2. The limiting mechanism 4 includes a fixing sleeve 401 sleeved on the outside of the reed switch 2. The fixing sleeve 401 wraps around the reed switch 2 along the axial direction of the reed switch 2, which plays a role in positioning and support. Fixing plates 404 are connected to both sides of the fixing sleeve 401. A fixing post 402 is connected inside the protective shell 1. An elastic buckle 403 is connected to the top of the fixing post 402. A slot 405 is provided on the fixing plate 404. The elastic buckle 403 matches the slot 405. The elastic buckle 403 can deform under the action of external force and automatically rebound after insertion, so as to lock with the slot 405 on the fixing plate 404. The elastic buckle 403 and the slot 405 work together to quickly and accurately pre-fix the reed switch 2 assembly before potting, preventing it from shifting, tilting or loosening during subsequent processing or use. The fixing post 402, the fixing post 402 and the elastic buckle 403 are all made of plastic. The fixing sleeve 401 has a soft pad 5 inside. The soft pad 5 is made of a flexible material with good elasticity (such as silicone rubber, EPDM rubber or polyurethane) and forms a buffer layer around the outer wall of the reed switch 2.

[0027] like Figures 1-4As shown, the top of the protective housing 1 is connected to the sealing cover 6 by bolts. The bolts are evenly distributed around the sealing cover 6. By tightening, uniform pressure can be applied to the sealing cover 6. A sealing gasket 7 is connected to the bottom of the sealing cover 6. The sealing gasket 7 can be a rectangular silicone gasket or a fluororubber gasket. When the sealing cover 6 is pressed, the sealing gasket 7 is deformed under pressure and fills the gap between the housing and the cover, forming a reliable static sealing structure. Connecting terminals 8 are connected to both sides inside the protective housing 1. The connecting terminals 8 are connected to the lead wire 3 by welding. The connecting terminals 8 serve as signal output interfaces for connecting to external electrical equipment. The protective housing 1 is filled with epoxy resin. Epoxy resin is a material with good adhesion, insulation, moisture resistance and mechanical strength. After curing, it can completely encapsulate all internal components, including the reed switch 2, lead wire 3, connecting terminals 8, etc., in a robust integral structure. This not only effectively secures the various components, preventing them from loosening or shifting during use, but also greatly enhances the overall device's resistance to electromagnetic interference and environmental adaptability. The protective housing 1 has a glue inlet on one side at the top for injecting epoxy resin into the protective housing 1. Mounting plates 9 are connected to both sides of the protective housing 1. Mounting plates 9 have mounting holes 10, which support the use of bolts, screws, or rivets to securely install the entire switch on mechanical equipment, cylinders, frames, or other mounting surfaces.

[0028] In practical use, when installing the reed switch 2, the fixing sleeve 401 is placed on the outside of the reed switch 2, and then the fixing sleeve 401 and the reed switch 2 are placed together inside the two fixing posts 402. Then, by pressing down the fixing plate 404, the fixing post 402 deforms during the downward movement of the elastic buckle 403 and automatically rebounds after insertion, locking with the slot 405 on the fixing plate 404, thus initially limiting the reed switch 2. Then, the lead wire 3 is welded to the terminal 8, and epoxy resin is filled into the protective housing 1 through the glue-filling port to fix the reed switch 2. Then, the sealing cover 6 is installed with bolts. When it is necessary to use this magnetic proximity switch, external equipment can be connected through the connecting terminals 8 on both sides of the protective housing 1. Finally, the entire magnetic proximity switch can be firmly installed on mechanical equipment, cylinders, frames or other mounting surfaces using bolts, screws or rivets.

[0029] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A magnetic proximity switch, characterized in that, The device includes a protective shell (1), inside which is a reed switch (2), with lead wires (3) connected to both ends of the reed switch (2), and a limiting mechanism (4) on the outside of the reed switch (2). The limiting mechanism (4) includes a fixing sleeve (401) sleeved on the outside of the reed switch (2), with fixing plates (404) connected to both sides of the fixing sleeve (401), a fixing post (402) connected inside the protective shell (1), with an elastic buckle (403) connected to the top of the fixing post (402), and a slot (405) on the fixing plate (404), with the elastic buckle (403) matching the slot (405).

2. A magnetic proximity switch according to claim 1, characterized in that, The fixing sleeve (401) has a soft pad (5) inside.

3. A magnetic proximity switch according to claim 1, characterized in that, The fixed post (402), the fixed post (402) and the elastic buckle (403) are all made of plastic.

4. A magnetic proximity switch according to claim 1, characterized in that, The top of the protective shell (1) is connected to the sealing cover (6) by bolts, and a sealing gasket (7) is connected to the bottom of the sealing cover (6).

5. A magnetic proximity switch according to claim 1, characterized in that, The protective housing (1) has connecting terminals (8) on both sides inside. The connecting terminals (8) are connected to the lead wire (3) by welding.

6. A magnetic proximity switch according to claim 1, characterized in that, The protective shell (1) is filled with epoxy resin. The protective shell (1) is connected to mounting plates (10) on both sides. Mounting holes (11) are provided on the mounting plates (10).

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