Inductance type proximity sensor

Abstract

An inductance type proximity sensor comprises a sensor body, and the sensor body is connected with an inductive head through a cable. A bottom plate is arranged at the bottom of the sensor main body, and a PCB clamped and fixed by the sensor main body and the bottom plate is arranged in the sensor main body; the inductive head comprises an inductive head shell and a front end cover plate which are connected with each other; and an inductor combination which is clamped and fixed by the inductive head shell and the front end cover plate is arranged in the inductive head shell. The detection circuit is arranged on the PCB, and mutual interference between the inductor combination and the detection circuit can be reduced through the design that the inductor combination and the detection circuit are separated. And the clamping and fixing design of the combination of the PCB and the inductor enables the structure to be more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to an inductive proximity sensor. Background Art

[0002] An inductive proximity sensor is a non-contact detection device based on the principle of electromagnetic induction, and is widely used in the fields of industrial automation, robotics, machinery manufacturing, safety monitoring, etc. The working principle of the inductive proximity sensor is based on the electromagnetic induction phenomenon. When a metal object approaches the sensing surface of the sensor, eddy currents will be generated inside the metal object. This eddy current will in turn generate a magnetic field that affects the original magnetic field inside the sensor. By measuring this magnetic field change, the sensor can accurately determine whether a metal object is approaching and output a corresponding electrical signal. However, such sensors often face problems in practical applications such as insufficient sensitivity, susceptibility to environmental interference (such as electromagnetic noise, temperature changes), complex circuits, and unstable induction caused by an unstable structure, which limits their scope of use and performance.

[0003] A new type of inductive proximity sensor with the prior art publication number CN202393398U discloses a new type of inductive proximity sensor, including a square housing and a magnetic powder core arranged inside the square housing, a coil wound around the magnetic powder core, a circuit board electrically connected to the magnetic powder core, and an indicator light connected to the circuit board. The coil wound around the magnetic powder core and the electronic component capacitor on the circuit board form an LC oscillator. Reinforcing ribs are provided inside the square housing, and the circuit board is fixed on the reinforcing ribs. The inductive proximity sensor provided by this utility model has the detection circuit and the inductance component not completely separated, and the structure is not stable enough, is susceptible to environmental interference, and has unstable induction. Summary of the Utility Model

[0004] In the existing inductive proximity sensors, the detection circuit and the inductance component are mostly integrally designed, which is easy to interfere with each other and has unstable induction. At the same time, most of the existing inductive proximity sensors have a metal connector plug-in structure, with complex production processes and inconvenient installation.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is: an inductive proximity sensor, including a sensor main body, and the sensor main body is connected to a sensing head through a cable; a bottom plate is provided at the bottom of the sensor main body, and a PCB board clamped and fixed by the sensor main body and the bottom plate is arranged inside the sensor main body; the sensing head includes a sensing head housing and a front end cover plate connected to each other; an inductance combination clamped and fixed by the sensing head housing and the front end cover plate is arranged inside the sensing head housing. The detection circuit is arranged on the PCB board. The separate design of the inductance combination and the detection circuit can reduce the mutual interference between the two. The clamping and fixing design of the PCB board and the inductance combination can make the structure more stable.

[0006] Preferably, the PCB includes a chipset; one end of the PCB is provided with a power connector pin, and the other end is provided with an indicator light group. One end of the sensor body is provided with a power pin hole that matches the power connector pin on the PCB, through which the power connector pin extends and is secured. The sensor body is also provided with an indicator light hole that corresponds to the indicator light group on the PCB, through which the indicator light group extends. The power pin hole secures the power connector pin, thereby providing a certain degree of stability to the PCB. The indicator light group is used to display sensor detection results.

[0007] Preferably, a first bolt locking hole extending from front to back and a second bolt locking hole extending from top to bottom are provided in the middle of the sensor body. Buckles are provided around the base plate, and slots are provided around the lower end of the sensor body. The base plate and the sensor body are connected by the buckles and slots. Reinforcement ribs are provided at the connection between the base plate and the PCB board to fix the PCB board. The sensor body can be fixed in both directions by two bolt locking holes, which makes the structure more stable and the installation more convenient. The interlocking connection between the base plate and the sensor body ensures a firm structure while facilitating installation. The reinforcement ribs on the base plate can position the PCB board, making the clamping fixation more stable.

[0008] The front cover preferably snaps into place with the sensor head housing. The front cover features a cylindrical inductor mounting slot, into which the inductor assembly is placed. The sensor head housing and the front cover secure the inductor assembly within the slot. A mounting nut is provided at the bottom of the sensor head housing. The snap-fit connection between the front cover and the sensor head housing facilitates installation, while the clamping and securing of the inductor assembly within the slot provides a more stable structure. The mounting nut at the bottom of the sensor head housing allows the sensor head to be secured in various application scenarios, enhancing versatility and flexibility.

[0009] The beneficial effects of the present invention are: through the improvement of structure and circuit, the present invention can provide a simpler installation method compared with conventional structures on the market, the PCB board positioning is more reliable, the electrical performance is more stable, the induction is more stable, and the installation and use are more flexible and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the overall structure diagram of the utility model.

[0011] Figure 2 Schematic diagram of the structure of the sensor body.

[0012] Figure 3 This is a structural diagram of the PCB board.

[0013] Figure 4 Schematic diagram of the base plate structure.

[0014] Figure 5 This is a schematic diagram of the overall structure of the sensor head.

[0015] Figure 6 It is a structural schematic diagram of the front end cover plate.

[0016] Figure 7 It is a structural schematic diagram of the inductor combination.

[0017] Figure 8 It is a sectional view structure diagram of the sensor main body of the present utility model.

[0018] Figure 9 It is a sectional view structure diagram of the induction head.

[0019] Among them, 1 is the sensor main body, 2-1 is the first induction head, 2-2 is the second induction head, 3 is the cable, 4 is the bottom plate, 5 is the PCB board, 6 is the induction head housing, 7 is the front end cover plate, 8 is the inductor combination, 9 is the chip set, 10 is the power connector pin, 11 is the indicator light group, 12 is the power pin hole, 13 is the indicator light hole, 14 is the first bolt locking hole, 15 is the second bolt locking hole, 16 is the buckle, 17 is the card slot, 18 is the reinforcing rib, 19 is the inductor fixing slot, 20 is the inlaid nut, 21 is the indicator light cover, 22 is the induction head cable interface, 23 is the glue inlet, 24 is the air outlet hole, 25 is the glue reduction groove, 26 is the main body cable interface, 27 is the lamp cover card slot, 28 is the cover plate buckle, 29 is the coil, 30 is the terminal, 31 is the protective shell. Specific implementation mode

[0020] The following further describes the present invention in detail with reference to the drawings.

[0021] Embodiment 1: Embodiment 1 of the present utility model provides an inductive proximity sensor, including a sensor main body 1. The sensor main body 1 is connected to the induction head through a cable 3. The cable 3 connects the main body cable interface 26 at the rear side of the sensor main body 1 and the induction head cable interface 22 on the front end cover plate 7 of the induction head. A bottom plate 4 is provided at the bottom of the sensor main body 1, and a PCB board 5 clamped and fixed by the sensor main body 1 and the bottom plate 4 is provided inside the sensor main body 1; the induction head includes an induction head housing 6 and a front end cover plate 7 connected to each other; an inductor combination 8 clamped and fixed by the induction head housing 6 and the front end cover plate 7 is provided inside the induction head housing 6. The detection circuit is arranged on the PCB board 5. The separated design of the inductor combination 8 and the detection circuit can reduce the mutual interference between the two. The clamped and fixed design of the PCB board 5 and the inductor combination 8 can make the structure more stable.

[0022] As a further improvement of the present utility model, as Figure 3As shown in the figure, the PCB includes a chipset 9; one end of the PCB board 5 is provided with a power connector pin 10, and the other end is provided with an indicator light group 11. The indicator light group 11 includes an induction head indicator light and a power indicator light from left to right. One end of the sensor body 1 is provided with a power pin hole 12 that matches the power connector pin 10 on the PCB board 5, and the power connector pin 10 passes through the power pin hole 12 and is fixed. The power connector pin 10 uses an M12 PIN pin (male connector pin of the power connector), and this power connector is a circular connector of German standard, with characteristics such as waterproof, dustproof, and anti-interference. Therefore, it can work reliably in various industrial environments, and at the same time, there are matching sockets for this power connector in most application scenarios, so the application scenarios are more extensive. The sensor body 1 is provided with indicator light holes 13 corresponding to the indicator light group 11 on the PCB board 5, and the indicator light group 11 passes through the indicator light holes 13. The power pin hole 12 can fix the power connector pin 10, thus having a certain fixing effect on the PCB board 5. The indicator light group 11 is used to display the detection results of the sensor.

[0023] As a further improvement of the present utility model, as Figure 2 shown, a lamp cover slot 27 is provided at the position of the indicator light hole 13 on the sensor body 1, and the transparent indicator light cover 21 can be fixed on the indicator light hole 13 through the lamp cover slot 27, which can ensure that the circuit structure is sealed and not easily interfered by the outside world, and can protect the indicator light from being damaged.

[0024] As a further improvement of the present utility model, a first bolt attachment hole 14 that penetrates through the front and back and a second bolt attachment hole 15 that penetrates through the top and bottom are provided in the middle of the sensor body 1. As Figure 4 shown, buckles 16 are provided around the bottom plate 4, and slots 17 are provided at the lower ends of the four sides of the sensor body 1. The bottom plate 4 and the sensor body 1 are fitted and connected through the buckles 16 and the slots 17. A reinforcing rib 18 is provided at the connection between the bottom plate 4 and the PCB board 5 to fix the PCB board 5. The sensor body 1 can be fixed bidirectionally through the two bolt attachment holes, with a more stable structure and more convenient installation. The fitted and connected bottom plate 4 and sensor body 1 ensure a firm structure while being convenient for installation. The reinforcing rib 18 on the bottom plate 4 can position the PCB board 5 to make the clamping and fixing more stable.

[0025] As a further improvement of the present utility model, after the sensor body 1 is installed as Figure 8 shown, in order to ensure the structural stability, potting treatment is carried out to fill the pores of each part of the sensor body 1 and improve the overall protection ability. Glue inlet ports 23 are provided on the bottom plate 4 and the PCB board 5 to facilitate the inflow of the glue; after the glue is poured in, it preferentially covers the reinforcing rib 18 on the bottom plate 4 to enhance the fixing effect of the overall structure on the PCB board 5.

[0026] As a further improvement of the present utility model, as Figure 5 , Figure 6As shown, the front cover plate 7 on the induction head is provided with a cover plate buckle 28, and the front cover plate 7 is snap-connected to the induction head housing 6 through the cover plate buckle 28; the front cover plate 7 is provided with an inductance fixing groove 19 in the shape of a cylindrical hole, and the inductance assembly 8 is placed in the inductance fixing groove 19, and the inductance assembly 8 therein is clamped and fixed by the induction head housing 6 and the front cover plate 7; the inductance assembly 8 is as Figure 7 shown, including a coil 29, a terminal 30 and a protective case 31. The bottom end of the induction head housing 6 is provided with an inlaid nut 20. The design of the snap connection between the front cover plate 7 and the induction head housing 6 makes the installation of this product more convenient, and the design of the inductance assembly 8 placed in the inductance fixing groove 19 and clamped and fixed makes the structure more stable. The inlaid nut 20 at the bottom end of the induction head housing 6 can fix the induction head in different application scenarios, with better versatility and more flexible use.

[0027] As a further improvement of the present utility model, after the induction head is installed as Figure 9 shown, in order to ensure the structural stability, potting treatment is carried out to fill the pores of each part of the induction head and improve the overall protection ability. The front panel of the induction head is provided with a glue inlet 23 for pouring in the glue; the front panel is also provided with an air outlet 24 for discharging air when the glue fills the cavity; the side of the induction head housing 6 is provided with a glue reduction groove 25 for controlling the flow direction of the glue.

[0028] During use, the induction head needs to be fixed at the position to be measured through the inlaid nut 20, and the sensor main body 1 is fixed at a position convenient for the user to observe through the first bolt locking hole 14 and the second bolt locking hole 15. After the power is turned on, the power indicator light is on. When a metal object approaches the front panel of the induction head, the magnetic field generated by the inductance component causes eddy currents to be generated inside the metal object, and this eddy current will in turn generate a magnetic field that affects the original magnetic field of the pole component. When the detection circuit on the PCB board 5 detects the magnetic field change, the indicator light is lit, and when the induction head detects a metal object, the induction head indicator light at the leftmost side of the indicator light group 11 on the sensor main body 1 is lit.

[0029] Embodiment 2: As Figure 1As shown in the figure, Embodiment 2 of the present utility model provides an inductive proximity sensor, which includes a sensor body 1. The sensor body 1 is connected to an induction head through a cable 3. The cable 3 connects the main cable interface 26 at the rear side of the sensor body 1 and the induction head cable interface 22 on the front-end cover plate 7 of the induction head. There are two induction heads in Embodiment 2 of the present utility model, namely a first induction head 2-1 and a second induction head 2-2. A bottom plate 4 is provided at the bottom of the sensor body 1, and a PCB board 5 clamped and fixed by the sensor body 1 and the bottom plate 4 is provided inside the sensor body 1. The induction head includes an induction head housing 6 and a front-end cover plate 7 connected to each other. An inductance combination 8 clamped and fixed by the induction head housing 6 and the front-end cover plate 7 is provided inside the induction head housing 6. The detection circuit is arranged on the PCB board 5. The design of separating the inductance combination 8 and the detection circuit can reduce the mutual interference between the two. The clamped and fixed design of the PCB board 5 and the inductance combination 8 can make the structure more stable.

[0030] As a further improvement of the present utility model, as Figure 3 shown, the PCB includes a chipset 9; one end of the PCB board 5 is provided with a power connector pin 10, and the other end is provided with an indicator light group 11. The indicator light group 11 is, from left to right, the first induction head 2-1 indicator light, the power indicator light, and the second induction head 2-2 indicator light. One end of the sensor body 1 is provided with a power pin hole 12 matching the power connector pin 10 on the PCB board 5, and the power connector pin 10 passes through and is fixed from the power pin hole 12. The power connector pin 10 uses an M12 PIN pin (power connector male connector pin). This power connector is a German standard circular connector, which has the characteristics of waterproof, dustproof, anti-interference, etc. Therefore, it can work reliably in various industrial environments, and at the same time, there are matching sockets for this power connector in most application scenarios, and the application scenarios are more extensive. The sensor body 1 is provided with an indicator light hole 13 corresponding to the indicator light group 11 on the PCB board 5, and the indicator light group 11 passes through from the indicator light hole 13. The power pin hole 12 can fix the power connector pin 10, thereby having a certain fixing effect on the PCB board 5. The indicator light group 11 is used to display the detection result of the sensor.

[0031] As a further improvement of the present utility model, as Figure 1 and Figure 2 shown, a lamp cover slot 27 is provided at the position of the indicator light hole 13 on the sensor body 1. The transparent indicator light cover 21 can be fixed on the indicator light hole 13 through the lamp cover slot 27, which can ensure that the circuit structure is sealed and not easily interfered by the outside, and protect the indicator light from being damaged.

[0032] As a further improvement of the present utility model, a first bolt attachment hole 14 penetrating through the front and back and a second bolt attachment hole 15 penetrating through the top and bottom are provided in the middle of the sensor body 1. As Figure 4As shown in the figure, the bottom plate 4 is provided with buckles 16 around it, and the lower ends of the four sides of the sensor main body 1 are provided with clamping grooves 17. The bottom plate 4 and the sensor main body 1 are fitted and connected through the buckles 16 and the clamping grooves 17. A reinforcing rib 18 is provided at the connection between the bottom plate 4 and the PCB board 5 to fix the PCB board 5. The sensor main body 1 can be fixed bidirectionally through two bolt locking holes, with a more stable structure and more convenient installation. The fitted and connected bottom plate 4 and sensor main body 1 ensure a firm structure while being convenient for installation. The reinforcing rib 18 on the bottom plate 4 can position the PCB board 5 to make the clamping and fixing more stable.

[0033] As a further improvement of the present utility model, after the sensor main body 1 is installed as Figure 8 shown, in order to ensure the structural stability, potting treatment is carried out to fill the pores of each part of the sensor main body 1 and improve the overall protection ability. Glue inlets 23 are provided on the bottom plate 4 and the PCB board 5 to facilitate the inflow of the glue material. After the glue material is poured in, it preferentially covers the reinforcing rib 18 on the bottom plate 4 to enhance the fixing effect of the overall structure on the PCB board 5.

[0034] As a further improvement of the present utility model, as Figure 5 , Figure 6 shown, a cover buckle 28 is provided on the front-end cover plate 7 of the induction head. The front-end cover plate 7 is buckled and connected to the induction head housing 6 through the cover buckle 28. A cylindrical hole-shaped inductor fixing groove 19 is provided on the front-end cover plate 7, and the inductor assembly 8 is placed in the inductor fixing groove 19. The induction head housing 6 and the front-end cover plate 7 clamp and fix the inductor assembly 8 therein. The inductor assembly 8 is as Figure 7 shown. An inlaid nut 20 is provided at the bottom end of the induction head housing 6. The design of the buckling connection between the front-end cover plate 7 and the induction head housing 6 makes the installation of this product more convenient. The design of clamping and fixing the inductor assembly 8 in the inductor fixing groove 19 makes the structure more stable. The inlaid nut 20 at the bottom end of the induction head housing 6 can fix the induction head in different application scenarios, with better versatility and more flexible use.

[0035] As a further improvement of the present utility model, after the induction head is installed as Figure 9 shown, in order to ensure the structural stability, potting treatment is carried out to fill the pores of each part of the induction head and improve the overall protection ability. A glue inlet 23 is provided on the front panel of the induction head for pouring in the glue material. An air outlet 24 is also provided on the front panel for discharging air when the glue material fills the cavity. A glue reduction groove 25 is provided on the side of the induction head housing 6 for controlling the flow direction of the glue material.

[0036] During use, the induction head needs to be fixed at the position to be measured by means of the embedded nut 20, and the sensor body 1 is fixed at a position convenient for the user to observe by means of the first bolt locking hole 14 and the second bolt locking hole 15. After the power is turned on, the power indicator light will light up. When a metal object approaches the front panel of the induction head, the magnetic field generated by the inductor assembly will cause eddy currents to be generated inside the metal object. This eddy current will in turn generate a magnetic field, affecting the original magnetic field of the pole assembly. The detection circuit on the PCB board 5 will light up the indicator light when it detects a change in the magnetic field; when the first induction head 2-1 detects a metal object, the indicator light of the first induction head 2-1 on the far left of the indicator light group 11 on the sensor body 1 will light up; when the second induction head 2-2 detects a metal object, the indicator light of the second induction head 2-2 on the far right of the indicator light group 11 on the sensor body 1 will light up.

[0037] The above specific embodiments are merely preferred embodiments of the present invention and are not intended to limit the specific implementation structure and scope of the present invention. In fact, equivalent variations can be made based on the shape, structure, and design purpose of the present invention. Therefore, all equivalent variations made based on the shape, structure, and design purpose of the present invention should be included in the scope of protection of the present invention and should be protected by the present invention.

Claims

1. An inductive proximity sensor, characterized in that, It includes a sensor body (1), and the sensor body (1) is connected to a sensing head (2) through a cable (3); a bottom plate (4) is provided at the bottom of the sensor body (1), and a PCB board (5) clamped and fixed by the sensor body (1) and the bottom plate (4) is provided inside the sensor body (1); the sensing head (2) includes a sensing head housing (6) and a front end cover plate (7) connected to each other; an inductance assembly (8) clamped and fixed by the sensing head housing (6) and the front end cover plate (7) is provided inside the sensing head housing (6).

2. The inductive proximity sensor according to claim 1, characterized in that, The PCB board (5) includes a chipset (9); a power connector pin (10) is provided at one end of the PCB board (5), and an indicator light group (11) is provided at the other end.

3. The inductive proximity sensor according to claim 1, characterized in that, A power pin hole (12) matching the power connector pin (10) on the PCB board (5) is provided at one end of the sensor body (1), and the power connector pin (10) passes through and is fixed from the power pin hole (12).

4. The inductive proximity sensor according to claim 1 or 3, characterized in that, An indicator light hole (13) corresponding to the indicator light group (11) on the PCB board (5) is provided on the sensor body (1), and the indicator light group (11) passes through from the indicator light hole (13).

5. The inductive proximity sensor according to claim 1 or 3, characterized in that The sensor body (1) is further provided with a first bolt attachment hole (14) penetrating through from front to back and a second bolt attachment hole (15) penetrating through from top to bottom.

6. The inductive proximity sensor according to claim 1, characterized in that, Clasps (16) are provided around the bottom plate (4), a card slot (17) corresponding to the clasps (16) is provided at the bottom of the sensor body (1), and the bottom plate (4) and the sensor body (1) are connected in an embedded manner through the clasps (16) and the card slot (17).

7. The inductive proximity sensor according to claim 1 or 6, characterized in that, A reinforcing rib (18) is provided at the connection between the bottom plate (4) and the PCB board (5) to fix the PCB board (5).

8. The inductive proximity sensor according to claim 1, characterized in that, The front end cover plate (7) is snap-connected to the sensing head housing (6), an inductance fixing groove (19) in the shape of a cylindrical hole is provided on the front end cover plate (7), the inductance assembly (8) is placed in the inductance fixing groove (19), and the inductance assembly (8) therein is clamped and fixed by the sensing head housing (6) and the front end cover plate (7).

9. The inductive proximity sensor according to claim 1, characterized in that, An inlaid nut (20) is provided at the bottom end of the sensing head housing (6).

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