Inductance type metal distance detection switch sensor

Abstract

The utility model discloses an inductance type metal distance detection switch sensor, which comprises a shell, a magnetic tank assembly and a PCB (printed circuit board), the magnetic tank assembly and the PCB are sequentially arranged in the shell, the magnetic tank assembly is connected with the PCB, the PCB comprises a sensing element, the shell comprises a head and a cavity, the head and the cavity are combined to form the shell with an L-shaped cross section, the head is hollow, and the magnetic tank assembly is connected with the PCB. The connector end of the head is communicated with the interior of the cavity, one end of the cavity is communicated with the head, the end, away from the head, of the cavity is an open end, the magnetic tank assembly is contained in the head, and the PCB is contained in the cavity. According to the utility model, by arranging the shell structure with the L-shaped cross section, the head part of the shell can be adapted to a specific use and installation environment, the cavity of the shell can be used for accommodating the magnetic tank assembly and the PCB, the connection mode of the magnetic tank assembly and the PCB is simple, and the magnetic tank assembly and the PCB have multiple wire outlet modes, can be adapted to wire-to-board quick plug connectors of multiple models, and are high in applicability.

Description

Technical Field

[0001] This utility model relates to the field of proximity switch technology, and in particular to an inductive metal distance detection switch sensor. Background Technology

[0002] In the fields of modern industrial automation and intelligent equipment, fitness equipment, and home appliances, the demand for highly reliable, small-sized sensing control components is growing. Inductive metal distance detection switches are innovative products developed to meet this trend. Based on the principle of inductive sensing, inductive proximity switches can accurately detect changes in distance between metal objects and the switch's sensing surface. Furthermore, they operate entirely without contact, effectively avoiding the performance degradation and frequent malfunctions caused by mechanical wear during frequent use of traditional contact switches.

[0003] Currently, most inductive proximity switches are threaded, straight-rod, or square in shape. However, in certain specific installation environments, none of these structures are the optimal choice. For example, in a narrow space with limited height, while threaded and straight-rod structures can detect at the ends, the rods are relatively long and the wires at the tail require considerable space. Although square structures can meet the wire exit space requirements, it is difficult for the switch's detection area to ideally reach the detection surface. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an inductive metal distance detection switch sensor.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] An inductive metal distance detection switch sensor includes: a housing, a magnetic can assembly, and a PCB board. The magnetic can assembly and the PCB board are sequentially disposed within the housing and connected to the PCB board. The PCB board includes a sensing element. The housing includes a head and a cavity. The head and the cavity are combined to form an L-shaped housing with a hollow structure. One end of the head is a sealed end, and the other end is an interface end. The interface end of the head communicates with the cavity. One end of the cavity communicates with the head, and the end of the cavity away from the head is an open end. The magnetic can assembly is housed within the head, and the PCB board is housed within the cavity.

[0007] The diameter of the head is 5±2mm, and the length of the head is 6±3mm; the width of the cavity is 3mm-14mm, and the length of the cavity is 4.5mm-30mm.

[0008] In one embodiment, the head has a first receiving cavity, the cavity has a second receiving cavity, the first receiving cavity and the second receiving cavity are in communication, the magnetic can assembly is received in the first receiving cavity, and the PCB board is received in the second receiving cavity.

[0009] In one embodiment, the magnetic can assembly includes a coil, a magnetic core, and an outer cover, with the PCB board connected to the coil and the outer cover covering the magnetic core.

[0010] In one embodiment, the cavity is provided with a positioning component for positioning the PCB board. The positioning component includes a plurality of positioning posts located on the inner periphery of the cavity. The plurality of positioning posts are evenly distributed along the inner periphery of the cavity. One end of the positioning post is fixed to the bottom side of the cavity, and the other end of the positioning post faces the opening end of the cavity. The length of the positioning post is adapted to the thickness of the cavity. The outer periphery of the PCB board abuts against the plurality of positioning posts.

[0011] In one embodiment, the upper end of the positioning post is smaller than the lower end of the positioning post, the lower end of the positioning post is connected to the bottom side of the cavity, and when the PCB board is housed in the second accommodating cavity, the outer periphery of the PCB board abuts against the upper ends of the plurality of positioning posts.

[0012] In one embodiment, the upper end of the positioning post is provided with an inclined surface, which is inclined downward from the end face of the opening end of the cavity into the cavity.

[0013] In one embodiment, the magnetic can assembly has a magnetic can lead at one end away from the head, and the magnetic can lead extends from the outside of the PCB board at one end away from the magnetic can assembly to connect to the PCB board.

[0014] In one embodiment, a cable is connected to one end of the PCB board away from the magnetic can assembly, and the end of the cable extends from one side of the housing.

[0015] Compared with the prior art, the present invention has at least the following advantages:

[0016] This utility model discloses an inductive metal distance detection switch sensor. It features an L-shaped housing structure, the head of which can be adapted to specific installation environments, such as narrow spaces with limited height. The head of the housing has sufficient depth to enable detection. The housing cavity can accommodate a magnetic can assembly and a PCB board. The connection between the magnetic can assembly and the PCB board is simple. Compared to threaded or straight rod structures, which have fixed wire exit positions and are difficult to combine with quick-connect connectors, this inductive metal distance detection switch offers multiple wire exit methods and can be adapted to various types of wire-to-board quick-connect connectors, making it highly versatile. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0018] Figure 1 A schematic diagram of the structure of an inductive metal distance detection switch sensor provided by this utility model;

[0019] Figure 2 Another structural schematic diagram of an inductive metal distance detection switch sensor provided by this utility model;

[0020] Figure 3 A schematic diagram of the structure of an inductive metal distance detection switch sensor provided by this utility model, in which a magnetic can assembly is housed within the head;

[0021] Figure 4 A schematic diagram of the structure of an inductive metal distance detection switch sensor provided by this utility model, in which the PCB board is housed in the cavity;

[0022] Figure 5 A schematic diagram of different wiring methods for an inductive metal distance detection switch sensor provided by this utility model;

[0023] Figure 6 This is a schematic diagram of the PCB board structure in an inductive metal distance detection switch sensor provided by this utility model.

[0024] Figure descriptions: 10. Housing; 11. Head; 111. First accommodating cavity; 12. Cavity; 121. Second accommodating cavity; 20. Magnetic can assembly; 21. Magnetic can lead wire; 30. PCB board; 31. Cable; 32. Chip; 33. Oscillating capacitor; 40. Positioning assembly; 41. Positioning post; 411. Inclined surface. Detailed Implementation

[0025] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0026] An inductive metal distance detection switch sensor, referenced Figure 1-4 The system includes a housing 10, a magnetic can assembly 20, and a PCB board 30. The housing 10 has an L-shaped cross-section and is corrosion-resistant. The magnetic can assembly 20 and the PCB board 30 are sequentially disposed within the housing 10. The magnetic can assembly 20 is detachably disposed within the housing 10 and is connected to the PCB board 30. The magnetic can assembly 20 supports the PCB board 30 and communicates with external wires. The PCB board 30 includes a sensing element.

[0027] Reference Figure 1-3 The housing 10 includes a head 11 and a cavity 12, which together form an L-shaped cross-section. The head 11 is hollow, with one end being a sealed end and the other end being an interface end, which communicates with the cavity 12. One end of the cavity 12 communicates with the head 11, and the end of the cavity 12 away from the head 11 is an open end. Specifically, the head 11 has a first receiving cavity 111, and the cavity 12 has a second receiving cavity 121, which communicate with each other. The magnetic can assembly 20 is housed in the first receiving cavity 111 and is detachably connected to the housing 10 via the interface end. The PCB board 30 is housed in the second receiving cavity 121 and connected to the magnetic can assembly 20.

[0028] It should be noted that the head 11 can be square or polygonal, and the outer contour of the cavity 12 can be elliptical or rhomboid. The head 11 and the cavity 12 can each adopt different shapes to form different shell 10 structures. The shell 10 is made of corrosion-resistant material to improve its ability to resist external atmospheric pressure.

[0029] Furthermore, referring to Figure 1 The diameter of head 11 is 5±2mm, and the length of head 11 is 6±3mm. Figure 1 In the diagram, the diameter of the head 11 is represented by A, and the length of the head is represented by B.

[0030] Reference Figure 2 The width of cavity 12 is 3mm-14mm, and the length of cavity 12 is 4.5mm-30mm. Figure 2 In the diagram, the width of cavity 12 is represented by C, and the length of cavity 12 is represented by D.

[0031] Thus, the diameter and length of the head 11 constitute the size of the head 11, and the width and length of the cavity 12 constitute the size of the cavity 12. Since the diameter and length of the head 11, the width and length of the cavity 12 have different dimensions, the first accommodating cavity 111 and the second accommodating cavity 121 can respectively accommodate magnetic can assembly 20 and PCB board 30 of different sizes to adapt to the needs of switch sensors in different scenarios.

[0032] In one embodiment, the diameter of the head 11 is 5 mm, the length of the head 11 is 6 mm, the width of the cavity 12 is 5 mm-10 mm, and the length of the cavity 12 is 7.5 mm-15 mm.

[0033] Furthermore, referring to Figure 3 The magnetic can assembly 20 includes a coil, a magnetic core, and an outer cover. A PCB board 30 is connected to the coil, and the outer cover covers the magnetic core. A gap exists between the surface of the magnetic can assembly 20 that emits and receives the magnetic field and the sensing surface of the PCB board 30. It should be noted that the coil is wound with 2-8 layers of enameled wire with a diameter of 0.04mm-0.12mm, and works in conjunction with the oscillating capacitor 33 to provide high-frequency oscillation. The coil is fitted into the magnetic core after being coated with adhesive; the magnetic core is a ferrite core. It should be noted that the main function of the magnetic can assembly 20 is to generate a magnetic field so that when a metal object approaches, the frequency and amplitude of the switch sensor change, thereby altering the internal circuit parameters of the switch and achieving non-contact detection.

[0034] Furthermore, referring to Figure 3 and Figure 4 The cavity 12 is equipped with a positioning assembly 40 for positioning the PCB board 30. The positioning assembly 40 includes multiple positioning posts 41 located on the inner circumference of the cavity 12, which are evenly distributed along the inner circumferential direction of the cavity 12. The positioning posts 41 are vertically arranged, with one end fixed to the bottom side of the cavity 12 and the other end facing the opening end of the cavity 12. The length of the positioning posts 41 is adapted to the thickness of the cavity 12. The positioning posts 41 are used to position the PCB board 30. When the PCB board 30 is housed in the second receiving cavity 121 within the cavity 12, the outer circumference of the PCB board 30 abuts against the multiple positioning posts 41 to fix the PCB board 30 and prevent it from shaking within the second receiving cavity 121.

[0035] Furthermore, referring to Figure 3 and Figure 4The upper end of the positioning post 41 is smaller than the lower end of the positioning post 41, and the lower end of the positioning post 41 is connected to the bottom side of the cavity 12. Thus, when the PCB board 30 is housed in the second accommodating cavity 121, the outer periphery of the PCB board 30 abuts against the upper ends of the plurality of positioning posts 41, and the lower ends of the plurality of positioning posts 41 are used to support the PCB board 30 above the lower ends of the positioning posts 41, so that the PCB board 30 is separated from the bottom side of the cavity 12 by a certain distance.

[0036] Furthermore, referring to Figure 3 and Figure 4 The upper end of the positioning post 41 is provided with an inclined surface 411, which is inclined downward from the end end that is connected to the opening end of the cavity 12 into the cavity 12. In this way, when the PCB board 30 is accommodated in the second accommodating cavity 121, the inclined surfaces 411 at the upper ends of the multiple positioning posts 41 guide the PCB board 30 so that the PCB board 30 can be smoothly accommodated in the second accommodating cavity 121.

[0037] Furthermore, referring to Figure 3 and Figure 4 The magnetic can assembly 20 has a magnetic can lead 21 at the end furthest from the head 11. The end of the magnetic can lead 21, furthest from the magnetic can assembly 20, extends from the outside of the PCB board 30 to connect with it. It should be noted that the magnetic can lead 21 of the magnetic can assembly 20 is soldered to the PCB board 30. Specifically, the PCB board 30 has an interface for connecting the magnetic can lead 21, enabling connection between the PCB board 30 and the magnetic can assembly 20. Thus, compared to the threaded and straight-tube structures of the housing 10, which require adhesive bonding to secure the magnetic can assembly 20 to the PCB and ensure the linear position of the magnetic can lead 21, and necessitate soldering and fixing the magnetic can lead 21, followed by attaching the magnetic can protective sleeve and applying adhesive, the connection method of the magnetic can assembly 20 to the PCB board 30 in this invention is simpler and more efficient.

[0038] Reference Figure 4 and Figure 5 A cable 31 is connected to the end of the PCB board 30 away from the magnetic can assembly 20, and the end of the cable 31 extends from one side of the housing 10. It should be noted that the cable 31 can exit the PCB board 30 in various ways: it can exit perpendicularly to the PCB board 30, it can exit from the side of the housing 10 away from the head 11, or it can exit from the side of the housing 10. Compared to the threaded and straight-tube structures where the cable exits along the tube direction, this invention offers more options and is better suited to different installation environments.

[0039] The housing 10 of this invention can be combined with wire-to-board quick-connect connectors such as ZH1.5, PH2.0, and XH2.5, and the wire-to-board quick-connect connectors are used in combination with the cavity 12. Since these low-cost quick-connect connectors on the market are generally square in structure, it is difficult to achieve low-cost matching with the circular threaded structure or straight rod structure of the housing 10. Therefore, the housing 10 structure of this invention can realize the combination of quick-connect connectors at low cost.

[0040] Furthermore, referring to Figure 6 The PCB board 30 is equipped with a chip 32 and a vibration capacitor 33. The working principle of this inductive metal distance detection switch sensor is as follows: The inductive metal distance detection switch is externally powered via a cable 31 soldered to the PCB board 30. After being powered on, the inductive metal distance detection switch maintains the LC oscillation circuit composed of the wound magnetic can assembly 20 and the oscillating capacitor 33 on the PCB board 30. When a metal object approaches the head 11 of the housing 10, its frequency and amplitude change. The chip 32 is mounted on the PCB board 30. The oscillation change signal is fed back to the chip 32. The chip 32 analyzes and processes the signal internally, comparing it with parameters set by the external circuit. When a threshold is reached, the internal output of the chip 32 is turned on, thereby generating an output signal. When the metal object moves away from the head 11 of the housing 10, the oscillation change signal is fed back to the chip 32. The chip 32 detects the approach of the metal object by judging the change in the oscillation signal, thereby controlling the switch to open or close and sensing the distance.

[0041] This utility model features an L-shaped housing 10 structure. The head 11 of the housing 10 can be adapted to certain specific installation environments, such as a narrow space with limited height. The head 11 of the housing 10 has a certain depth to achieve the detection function. The cavity 12 of the housing 10 can accommodate the magnetic can assembly 20 and the PCB board 30. The connection between the magnetic can assembly 20 and the PCB board 30 is simple. Compared with the fixed wire outlet position and difficulty in combining with quick-connect connectors of threaded or straight rod structures, this inductive metal distance detection switch has multiple wire outlet methods and can be adapted to various types of wire-to-board quick-connect connectors, making it highly applicable.

[0042] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An inductive metal distance detection switch sensor, characterized in that The application relates to a shell (10), a magnetic tank assembly (20) and a PCB board (30), the magnetic tank assembly (20) and the PCB board (30) are sequentially arranged in the shell (10), the magnetic tank assembly (20) is connected with the PCB board (30), the PCB board (30) comprises an induction element, the shell (10) comprises a head (11) and a cavity (12), the head (11) and the cavity (12) are combined to form the shell (10) with an L-shaped cross section, the head (11) is hollow, one end of the head (11) is a sealed end, the other end of the head (11) is an interface end, the interface end of the head (11) is communicated with the cavity (12), one end of the cavity (12) is communicated with the head (11), and the other end of the cavity (12) away from the head (11) is an open end, the magnetic tank assembly (20) is arranged in the head (11), and the PCB board (30) is arranged in the cavity (12). The diameter of the head (11) is 5+ / -2 mm, and the length of the head (11) is 6+ / -3 mm; the width of the cavity (12) is 3-14 mm, and the length of the cavity (12) is 4.5-30 mm. A first accommodating cavity (111) is arranged in the head (11), a second accommodating cavity (121) is arranged in the cavity (12), the first accommodating cavity (111) is communicated with the second accommodating cavity (121), the magnetic tank assembly (20) is arranged in the first accommodating cavity (111), and the PCB board (30) is arranged in the second accommodating cavity (121).

2. A sensor according to claim 1, wherein the sensor is a sensor for detecting a distance between a metal object and the sensor. The magnetic tank assembly (20) comprises a coil, a magnetic core and an external cover, the PCB board (30) is connected with the coil, and the external cover covers the magnetic core.

3. An inductive metal distance probe switch sensor according to claim 2, characterized in that A positioning assembly (40) for positioning the PCB board (30) is arranged in the cavity (12), the positioning assembly (40) comprises a plurality of positioning columns (41) arranged on the inner periphery of the cavity (12), the plurality of positioning columns (41) are uniformly distributed along the inner periphery direction of the cavity (12), one end of the positioning column (41) is fixed to the bottom side of the cavity (12), the other end of the positioning column (41) faces the open end of the cavity (12), the length of the positioning column (41) is matched with the thickness of the cavity (12), and the outer periphery of the PCB board (30) is in abutment with the plurality of positioning columns (41).

4. An inductive metal distance detecting switch sensor according to claim 2, wherein The upper end of the positioning column (41) is smaller than the lower end of the positioning column (41), the lower end of the positioning column (41) is connected with the bottom side of the cavity (12), and when the PCB board (30) is arranged in the second accommodating cavity (121), the outer periphery of the PCB board (30) is in abutment with the upper end of the plurality of positioning columns (41).

5. An inductive metal distance detection switch sensor according to claim 4, characterized in that The upper end of the positioning column (41) is provided with an inclined surface (411), and the inclined surface (411) is arranged downwardly in the cavity (12) from the end surface of the open end of the cavity (12).

6. A sensor according to claim 5, wherein the sensor is a sensor for a metal distance detection switch. ​ 7. An inductive metal distance detecting switch sensor according to claim 3, wherein The magnetic tank assembly (20) is provided with a magnetic tank lead (21) at one end away from the head (11), and one end of the magnetic tank lead (21) away from the magnetic tank assembly (20) extends from the outer side of the PCB board (30) to be connected with the PCB board (30).

8. The inductive metal distance probe switch sensor of claim 1, wherein, The PCB board (30) is connected with a cable (31) at one end away from the magnetic tank assembly (20), and the end of the cable (31) extends from one side of the shell (10).

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