A proximity sensor

Abstract

The utility model provides a kind of proximity sensor belongs to sensor technical field, comprising: dry reed tube, it includes two connecting pins;Needle seat, two connecting pins pass through needle seat and are fixed with needle seat;Protective shell, it is fixed with needle seat, when needle seat and protective shell are fixed, protective cavity accommodating dry reed tube is formed between needle seat and protective shell;Advantage is in this embodiment, by dry reed tube and needle seat, protective shell and so on plastic piece are assembled to form protective cavity, replace the process of adopting glue potting dry reed tube in traditional technology.Potting glue is reduced in use, production procedure is simplified, material cost and processing cost are reduced;Meanwhile, the problem that production cycle is extended due to long glue curing time is avoided, and assembly efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, and in particular relates to a proximity sensor. Background Technology

[0002] Proximity sensors, as devices capable of detecting the proximity of objects, are widely used in various fields such as industrial automation, security monitoring, and smart homes. Traditional proximity sensors, especially those based on reed switch technology, typically use glue potting to fix and protect the internal sensitive element, such as the reed switch. However, this traditional process has some significant drawbacks: glue potting requires a long curing time, which not only increases the production cycle but also requires the equipment to remain stationary during the curing process, limiting production efficiency. Traditional connection methods usually rely on wire soldering or adapter terminals, and these intermediate links can easily introduce contact resistance, leading to increased signal transmission loss and affecting the sensor's sensitivity and response speed. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing an assembled proximity sensor.

[0004] The objective of this utility model can be achieved through the following technical solution: a proximity sensor, comprising:

[0005] A reed switch, which includes two connection pins;

[0006] The needle holder has two connecting pins that pass through it and are fixed to it.

[0007] A protective shell is fixed to the needle seat. When the needle seat is fixed to the protective shell, a protective cavity for accommodating the reed switch is formed between the needle seat and the protective shell.

[0008] In one of the aforementioned proximity sensors, the needle holder includes at least two opposing abutment surfaces, and when the needle holder is fixed to the protective housing, the abutment surfaces abut against the inner wall of the protective housing.

[0009] In one of the aforementioned proximity sensors, the insertion end of the contact surface is provided with a guide slope.

[0010] In one of the aforementioned proximity sensors, the contact surface includes a first contact surface disposed opposite to the reed switch along its length extension direction, and a second contact surface disposed opposite to the reed switch along its width direction.

[0011] In one of the proximity sensors described above, the needle holder and the protective housing are detachably fixedly connected.

[0012] In the aforementioned proximity sensor, one of the needle holder and the protective housing is provided with a plugging protrusion facing each other, and the other is provided with a plugging groove facing each other, wherein the plugging protrusion can be plugged into and fixed with the plugging groove.

[0013] In the aforementioned proximity sensor, the pin holder includes a mounting portion and a plug-in portion. The reed switch is connected to the mounting portion, and the plug-in portion includes an insertion cavity. The connecting pin of the reed switch extends into the insertion cavity. When the plug-in portion is plugged into and fixed with an external component, the connecting pin is electrically connected to the corresponding component.

[0014] In one of the aforementioned proximity sensors, the needle holder is provided with a pre-disassembly port, and a portion of the plug-in end of the protective shell is located inside the pre-disassembly port, allowing an external tool to be inserted into the pre-disassembly port to pry the protective shell.

[0015] In one of the aforementioned proximity sensors, the plug end of the protective shell is provided with an inclined surface. When the protective shell is fixed to the needle seat, a gap is left between the inclined surface and the needle seat to form an insertion space.

[0016] In the aforementioned proximity sensor, when the protective shell and the needle seat are fixed together to form a protective cavity, the inner wall of the protective cavity does not contact the reed switch.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] (1) By assembling the reed switch with plastic parts such as the needle socket and protective shell to form a protective cavity, the traditional process of potting the reed switch with glue is replaced. This reduces the use of potting glue, simplifies the production process, and lowers material and processing costs; at the same time, it avoids the problem of extended production cycle caused by long glue curing time and improves assembly efficiency.

[0019] (2) The needle holder and the protective housing are detachably fixed. This makes it easy to inspect, test, replace or repair internal components (such as reed switches) without having to completely replace the entire sensor device, thus reducing maintenance costs. If it is necessary to adjust the sensor configuration according to different application scenarios (such as replacing reed switches of different specifications), the detachable design allows for quick and easy adjustments, improving the product's adaptability and flexibility.

[0020] (3) The reed switch is fixed to the mounting part to achieve stable assembly in the pin socket; by directly inserting the connecting pin of the reed switch into the insertion cavity of the insertion part, and achieving direct electrical connection with external components during the insertion process, the number of wires, solder joints or adapter terminals required in traditional connections is effectively reduced. This not only simplifies the structure, but also significantly reduces contact resistance and signal transmission loss, and improves the sensitivity and stability of signal response. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure;

[0023] Figure 3 This is a three-dimensional structural diagram of the needle holder.

[0024] In the diagram, 100 is a reed switch; 101 is a connecting pin; 200 is a pin seat; 201 is a guide slope; 202 is a first abutment surface; 203 is a second abutment surface; 204 is a plug-in protrusion; 205 is a mounting part; 206 is a plug-in part; 207 is a pre-disassembly port; 300 is a protective shell; 301 is a plug-in groove; 302 is an inclined surface; and 303 is a protective cavity. Detailed Implementation

[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] like Figures 1-3 As shown, a proximity sensor includes:

[0028] The reed switch 100 includes two connecting pins 101;

[0029] The needle holder 200 has two connecting pins 101 that pass through and are fixed to the needle holder 200.

[0030] The protective shell 300 is fixed to the needle seat 200. When the needle seat 200 and the protective shell 300 are fixed, a protective cavity 303 for accommodating the reed switch 100 is formed between the needle seat 200 and the protective shell 300.

[0031] In this embodiment, the reed switch 100 is assembled with plastic parts such as the pin seat 200 and the protective shell 300 to form a protective cavity 303, replacing the traditional process of potting the reed switch 100 with glue. This reduces the use of potting glue, simplifies the production process, and lowers material and processing costs; at the same time, it avoids the problem of extended production cycles caused by long glue curing times, thus improving assembly efficiency.

[0032] It should be noted that the fixing between the reed switch 100 and the pin holder 200 can be achieved in several ways: For example, an interference fit can be used, where the mounting hole diameter inside the pin holder 200 is designed to be slightly smaller than the diameter of the connecting pin 101. During assembly, the body or pin root of the reed switch 100 is pressed firmly into the corresponding hole in the pin holder 200. Alternatively, adhesive can be applied by micro-application, placing a small amount of adhesive (such as epoxy resin or UV glue) at the contact points between the reed switch 100 pin and the pin holder 200 hole, or at local contact points between the body and the inner wall of the pin holder 200. This differs from traditional integral potting and is only used to enhance the reliability of the mechanical connection and prevent loosening; the amount used is small. When manufacturing the pin holder 200, the pin of the reed switch 100 is placed as an insert into the mold, and then injection molded. The plastic directly encapsulates the fixing part of the reed switch 100, forming an integrated structure.

[0033] Furthermore, the needle holder 200 includes at least two opposing abutment surfaces, which abut against the inner wall of the protective housing 300 when the needle holder 200 is fixed to the protective housing 300. This ensures a more stable position of the needle holder 200 within the protective housing 300, reducing displacement of internal components due to external vibrations or impacts. Simultaneously, the abutment surface design helps improve the overall sealing of the proximity sensor, preventing dust, moisture, and other external substances from entering the protective cavity 303, thereby protecting the reed switch 100 and other internal components from environmental influences.

[0034] Preferably, the insertion end of the contact surface is provided with a guide bevel 201. The insertion end refers to the part of the needle holder 200 that first contacts the protective housing 300 during the connection process between the protective housing 300 and the needle holder 200. The guide bevel 201 can act as a guide during assembly, making it easier and more accurate for the needle holder 200 to be inserted into the protective housing 300. Even if there is a slight positional deviation, the guide bevel 201 can help to automatically correct it, ensuring that the needle holder 200 smoothly enters the predetermined position.

[0035] The presence of the guide slope 201 reduces direct friction between the needle holder 200 and the protective shell 300, lowering the risk of wear between them. This is especially important for the plastic needle holder 200 and the protective shell 300, as it can extend their service life.

[0036] Further defined, the contact surface includes a first contact surface 202 disposed opposite to the reed switch 100 along the length extension direction, and a second contact surface 203 disposed opposite to the width direction of the reed switch 100.

[0037] The first contact surface 202 restricts the movement of the needle holder 200 in the length direction of the reed switch 100, and the second contact surface 203 restricts its displacement in the width direction. The two work together to enable the needle holder 200 to achieve complete positioning in the X and Y planes within the protective shell 300, effectively preventing circumferential rotation or offset after assembly, ensuring the spatial posture stability of the reed switch 100 in the protective cavity 303, and improving product consistency and reliability.

[0038] The multi-faceted contact significantly increases the contact area and the number of support points between the pin holder 200 and the protective shell 300, improving the overall mechanical strength of the structure. When subjected to external vibration, impact, or drop, it effectively disperses stress, preventing the internal reed switch 100 from breaking its pins or glass tube due to shaking, thus enhancing the sensor's durability.

[0039] Preferably, the needle holder 200 and the protective housing 300 are detachably fixedly connected. This allows internal components (such as the reed switch 100) to be easily inspected, tested, replaced, or repaired without completely replacing the entire sensor device, thus reducing maintenance costs. If it is necessary to adjust the sensor configuration for different application scenarios (e.g., replacing the reed switch 100 with a different specification), the detachable design allows for quick and easy adjustments, improving the product's adaptability and flexibility.

[0040] Specifically, one of the pin holder 200 and the protective shell 300 is provided with a plugging protrusion 204 facing each other, and the other is provided with a plugging groove 301 facing each other. The plugging protrusion 204 can be plugged into and fixed with the plugging groove 301.

[0041] like Figure 2 As shown, in one specific embodiment, the needle holder 200 is provided with a plugging protrusion 204, and the protective shell 300 is provided with a plugging groove 301.

[0042] Compared to traditional screw fixing methods, the plug-in design simplifies the assembly process, allowing for tool-free assembly or disassembly, greatly improving work efficiency and making it suitable for large-scale production and on-site maintenance. The abutment surfaces (including the first abutment surface 202 along the length of the reed switch 100 and the second abutment surface 203 along the width) provided on the pin holder 200 not only serve a positioning and support function after assembly, but also provide pre-guidance and spatial limitation for the alignment and insertion of the plug-in protrusion 204 and the plug-in groove 301 during the assembly process.

[0043] Specifically, during the initial docking stage between the needle holder 200 and the protective shell 300, the contact surface (especially the guide slope 201 at its insertion end) first contacts the inner wall of the protective shell 300, acting as a rough guide to guide the needle holder 200 into the correct position. As assembly progresses, the insertion protrusion 204 gradually approaches and inserts into the corresponding insertion groove 301. This multi-stage guiding mechanism of "first surface guidance, then block-groove mating" significantly reduces the risk of jamming, scratching, or assembly failure due to misalignment of the insertion protrusion 204 and the groove, improving assembly smoothness and success rate.

[0044] Specifically, the pin holder 200 includes a mounting part 205 and a plug-in part 206. The reed switch 100 is connected to the mounting part 205, and the plug-in part 206 includes an insertion cavity. The connecting pin 101 of the reed switch 100 extends into the insertion cavity. When the plug-in part 206 is plugged and fixed with an external component, the connecting pin 101 is electrically connected to the corresponding component.

[0045] The reed switch 100 is fixed to the mounting part 205, achieving stable assembly within the pin holder 200. By directly inserting the connecting pin 101 of the reed switch 100 into the insertion cavity of the insertion part 206, and achieving direct electrical connection with external components during insertion, the number of wires, solder joints, or adapter terminals required in traditional connections is effectively reduced. This not only simplifies the structure but also significantly reduces contact resistance and signal transmission loss, improving the sensitivity and stability of signal response.

[0046] The contact surface is located at the edge of the mounting part 205. During the assembly process of the needle seat 200 and the protective shell 300, the contact surface first contacts and fits against the inner wall of the protective shell 300, which plays a role in spatial positioning and directional guidance.

[0047] In a further preferred embodiment, the pin holder 200 is provided with a pre-disassembly opening 207, and part of the insertion end of the protective shell 300 is located in the pre-disassembly opening 207. The user can insert external tools (such as screwdrivers, pry bars, etc.) into the pre-disassembly opening 207 and directly act on the end of the protective shell 300. By applying leverage force, it causes elastic deformation, thereby disengaging the insertion protrusion 204 from the insertion groove 301, thus achieving convenient disassembly.

[0048] In a further preferred embodiment, the insertion end of the protective housing 300 is provided with an inclined surface 302. When the protective housing 300 is fixed to the pin seat 200, a gap is left between the inclined surface 302 and the pin seat 200 to form an insertion space. The design of the insertion space allows external tools (such as screwdrivers or pry bars) to more easily access and act on the protective housing 300. The tool can slide along the inclined surface into the insertion space, thereby easily prying the protective housing 300.

[0049] It is worth mentioning that the pre-disassembly port 207 has a bevel at the end opposite to the protective shell 300 as an insertion guide.

[0050] Because of the dedicated insertion space, users do not need to forcefully insert tools or use excessive force to disassemble the needle holder 200, reducing the risk of accidental damage to the protective shell 300, the needle holder 200, or other internal components.

[0051] Preferably, when the protective shell 300 and the needle seat 200 are fixed together to form a protective cavity 303, the inner wall of the protective cavity 303 does not contact the reed switch 100.

[0052] The reed switch 100 typically consists of a glass shell encapsulating internal spring magnetic contacts. This glass shell is brittle and has low impact resistance. If the inner wall of the protective cavity 303 directly contacts the reed switch 100, stress will be directly transmitted to the glass shell when subjected to external vibration, impact, or thermal expansion and contraction, easily leading to shell breakage or pin breakage. By using a non-contact, suspended arrangement, the direct transmission path of mechanical stress is cut off, effectively protecting the integrity of the reed switch 100.

[0053] The reed switch 100 (glass / metal) and the protective housing 300 (usually plastic or metal) have different coefficients of thermal expansion. If they are in direct contact, thermal stress will be generated under temperature changes, which may lead to fatigue failure over long-term cycles. The non-contact design provides a buffer space for thermal expansion, avoiding mutual compression or tearing caused by temperature differences.

[0054] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0055] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0056] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A proximity sensor, characterized by, include: A reed switch, which includes two connection pins; The needle holder has two connecting pins that pass through it and are fixed to it. A protective shell is fixed to the needle seat. When the needle seat is fixed to the protective shell, a protective cavity for accommodating the reed switch is formed between the needle seat and the protective shell.

2. A proximity sensor according to claim 1, wherein, The needle holder includes at least two opposing abutment surfaces. When the needle holder is fixed to the protective shell, the abutment surfaces abut against the inner wall of the protective shell.

3. A proximity sensor according to claim 2, wherein, The insertion end of the contact surface is provided with a guide slope.

4. A proximity sensor according to claim 2, wherein, The contact surface includes a first contact surface disposed opposite to the reed switch along its length extension direction, and a second contact surface disposed opposite to the reed switch along its width direction.

5. The proximity sensor of claim 1, wherein, The needle hub and the protective shell are detachably fixedly connected.

6. A proximity sensor according to claim 5, wherein, The pin holder and the protective shell are provided with a plugging protrusion on one side and a plugging groove on the other side, and the plugging protrusion can be plugged into the plugging groove for fixation.

7. The proximity sensor of claim 1, wherein, The pin holder includes a mounting part and a plug-in part. The reed switch is connected to the mounting part, and the plug-in part includes an insertion cavity. The connecting pin of the reed switch extends into the insertion cavity. When the plug-in part is plugged and fixed with an external component, the connecting pin is electrically connected to the corresponding component.

8. A proximity sensor according to claim 6, wherein, The needle hub is provided with a pre-disassembly port, and part of the plug end of the protective shell is located inside the pre-disassembly port. External tools can be inserted into the pre-disassembly port to pry the protective shell.

9. A proximity sensor according to claim 8, wherein, The plug end of the protective shell is provided with an inclined surface. When the protective shell is fixed to the needle seat, a gap is left between the inclined surface and the needle seat to form an insertion space.

10. The proximity sensor of claim 1, wherein, When the protective shell is fixed to the needle seat to form a protective cavity, the inner wall of the protective cavity does not contact the reed switch.

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