An inductive proximity switch

Abstract

The utility model discloses an inductance type proximity switch, including metal casing, the surface of metal casing is equipped with installation screw thread, the surface screw thread coupling of installation screw thread has the shield, one end of metal casing is connected with the inductive head, and the other end is connected with the connecting wire, and the inside both sides of shield are slidably installed with the shield board, and the detection adjusting mechanism is equipped between shield and shield board, and the bottom of shield is equipped with detection positioning mechanism. The utility model has the following effect: through the mutual cooperation of shield and internal shield board, can form the shielding structure for the constraint alternating magnetic field detection range, and through detection adjusting mechanism, can freely adjust the opening size of shielding structure, thereby according to the size of the measured object and the conveying interval in actual application to adjust the coverage range of magnetic field, avoid the signal superposition and the misrecognition caused by multiple objects simultaneously in the induction field, realize accurate, independent detection to single metal object.

Description

Technical Field

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

[0002] Inductive proximity switches, as a commonly used non-contact detection device, are widely used in industrial automation control, especially for the detection and counting of the position and travel of metal objects. Their working principle involves using an internal oscillating coil to generate an alternating magnetic field. When a metal object enters this magnetic field, eddy currents are induced within the object, causing energy loss in the oscillator or a change in the oscillation frequency, thereby triggering an output signal.

[0003] However, in practical applications, a significant drawback of existing standard inductive proximity switches has been found: the alternating magnetic field they generate typically diffuses freely in front of and around the sensing head, resulting in a large effective detection area that is not adjustable. When used to detect closely spaced metal objects on a conveyor line, if two or more metal objects are close together and simultaneously enter the effective detection area of ​​the inductive proximity switch, the alternating magnetic field will cover multiple targets at the same time. In this case, the proximity switch will identify multiple adjacent metal objects as a single, larger target, outputting only one detection signal. This can lead to missed detections, counting errors, or logic control malfunctions, severely affecting the sorting, counting, and positioning accuracy of automated equipment. Utility Model Content

[0004] In view of the problems in the related technologies, this utility model proposes an inductive 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] An inductive proximity switch includes a metal housing with mounting threads on its surface. A shield is threaded onto the mounting threads. A sensing head is connected to one end of the metal housing, and a connecting wire is connected to the other end. Shielding plates are slidably mounted on both sides inside the shield. A detection and adjustment mechanism is provided between the shield and the shield. A detection and positioning mechanism is provided at the bottom of the shield.

[0007] Furthermore, in order to adjust the distance between the two shielding plates inside the shielding cover, the detection and adjustment mechanism includes a transmission groove on the inner bottom surface of the shielding cover, a bidirectional screw is rotatably installed inside the transmission groove, a transmission block is connected to the bottom of the shielding plate, and the transmission block is threadedly connected to the bidirectional screw.

[0008] Furthermore, in order to install and fix the proximity switch as a whole, the detection and positioning mechanism includes a limiting groove at the bottom of the shielding cover, a limiting block slidingly installed inside the limiting groove, a positioning plate connected to the bottom of the limiting block, an adjustment groove on the bottom surface of the positioning plate, a bidirectional screw rod II rotatably installed inside the adjustment groove, and clamping plates threaded to both sides of the surface of the bidirectional screw rod II.

[0009] Furthermore, to facilitate the twisting and rotation of the first and second bidirectional screws, a twisting head is connected to one end of each of the first and second bidirectional screws.

[0010] Furthermore, to facilitate the twisting and unscrewing of the shielding cover and the metal housing, a twisting ring is connected to one side of the surface of the metal housing.

[0011] Furthermore, in order to achieve the overall power connection of the proximity switch, one end of the connecting wire is connected to a power connector.

[0012] Furthermore, in order to increase the friction when the clamping plate and the proximity switch mounting point are pressed together, an anti-slip pad is provided on one side of the clamping plate.

[0013] The beneficial effects of this utility model are as follows: through the cooperation of the shielding cover and the internal two-sided shielding plates, the alternating magnetic field generated by the induction head can be effectively limited to the sides and rear, thereby forming a rectangular opening shielding structure for constraining the detection range of the alternating magnetic field. This concentrates the magnetic field energy at the rectangular opening of the shielding structure, significantly reducing the effective detection area. Furthermore, through the detection adjustment mechanism, the size of the rectangular opening of the shielding structure can be freely adjusted, thereby adjusting the coverage of the magnetic field according to the size of the object being measured and the transmission distance in the actual application. This avoids signal superposition and misidentification caused by multiple objects being in the induction field at the same time, and achieves accurate and independent detection of a single metal object. Attached Figure Description

[0014] 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.

[0015] Figure 1 This is a schematic diagram of the surface structure of an inductive proximity switch according to an embodiment of the present utility model;

[0016] Figure 2 This is a side view of an inductive proximity switch after the shielding plate has been adjusted according to an embodiment of the present utility model;

[0017] Figure 3This is a rear view of an inductive proximity switch according to an embodiment of the present utility model;

[0018] Figure 4 This is a bottom view of an inductive proximity switch according to an embodiment of the present utility model;

[0019] Figure 5 This is a schematic diagram of the disassembly mechanism of the limit block and the shielding cover in an inductive proximity switch according to an embodiment of the present utility model;

[0020] Figure 6 This is a schematic diagram of the surface structure of the metal housing in an inductive proximity switch according to an embodiment of the present invention.

[0021] In the picture:

[0022] 1. Metal housing; 2. Mounting thread; 3. Shielding cover; 4. Sensor head; 5. Connecting wire; 6. Shielding plate; 7. Detection and adjustment mechanism; 701. Transmission groove; 702. Bidirectional screw one; 703. Transmission block; 8. Detection and positioning mechanism; 801. Limit groove; 802. Limit block; 803. Positioning plate; 804. Adjustment groove; 805. Bidirectional screw two; 806. Clamping plate; 9. Tightening head; 10. Tightening ring; 11. Power connector; 12. Anti-slip pad. Detailed Implementation

[0023] 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.

[0024] According to an embodiment of the present invention, an inductive proximity switch is provided.

[0025] like Figures 1-6As shown, an inductive proximity switch according to an embodiment of the present invention includes a metal housing 1. The surface of the metal housing 1 is provided with mounting threads 2, and a shield 3 is threadedly connected to the surface of the mounting threads 2. One end of the metal housing 1 is connected to a sensing head 4. The sensing head 4 and the interior of the metal housing 1 include a coil, an oscillator, a switching circuit, and an amplification output circuit. The coil is connected to the oscillator. After being energized, the oscillator drives the generation of a high-frequency alternating magnetic field, which is emitted from the sensing head. When a metal target approaches the magnetic field and reaches the sensing distance of the switch, eddy currents are generated inside the metal target due to electromagnetic induction. The reaction of the eddy currents increases the energy loss of the coil, thereby attenuating the oscillation amplitude of the oscillator, or even stopping it. This change in oscillation and cessation signal is detected and processed by the subsequent amplification output circuit. The switching circuit is converted into a standard switching signal, which triggers the drive controller to achieve non-contact detection of metal objects. Shielding plates 6 are slidably installed on both sides of the inner side of the shielding cover 3. Both the shielding plates 6 and the shielding cover 3 are made of low-carbon steel. Through the cooperation of the shielding cover 3 and the shielding plates 6 on both sides, a rectangular opening shielding interface can be formed. Through this shielding structure, the alternating magnetic field generated by the sensing head 4 can be constrained, so that the magnetic field energy is concentrated at the rectangular opening of the shielding structure. A detection adjustment mechanism 7 is provided between the shielding cover 3 and the shielding plates 6 to adjust the distance between the two shielding plates 6, thereby changing the size of the opening of the shielding structure. A detection positioning mechanism 8 is provided at the bottom of the shielding cover 3 to fix the proximity switch as a whole at the place to be detected (such as the side of a conveyor belt used to transport metal objects).

[0026] like Figures 1-6As shown, the detection adjustment mechanism 7 includes a transmission groove 701 on the inner bottom surface of the shielding cover 3. A bidirectional screw 702 is rotatably mounted inside the transmission groove 701. The threads on both sides of the surface of the bidirectional screw 702 are opposite. Transmission blocks 703 are connected to the bottom of both shielding plates 6. The transmission blocks 703 are threadedly connected to the bidirectional screw 702. By rotating the bidirectional screw 702, the two transmission blocks 703 drive the shielding plates 6 to move relative to each other on their surfaces, thereby changing the distance between the two shielding plates 6. This allows for adjustment of the rectangular opening of the shielding interface when detecting metal objects of different sizes. The detection positioning mechanism 8 includes a limiting groove 801 on the bottom of the shielding cover 3. A limiting block 802 is slidably mounted inside the limiting groove 801. A positioning plate 803 is connected to the bottom of the limiting block 802. An adjustment groove 804 is opened on the bottom surface of the positioning plate 803. A bidirectional screw 805 is rotatably mounted inside the adjustment groove 804. The threads on both sides of the surface of the bidirectional screw 805 are opposite. A clamping plate 806 is connected to the side thread. By turning the double-ended screw 805, the two clamping plates 806 are brought closer together and placed on both sides of the required installation location of the proximity switch. The clamping plates 806 securely clamp the device, achieving a fixed installation of the entire device. The distance between the shielding structure opening and the object to be detected can be adjusted by sliding the limiting block 802 in the adjusting groove 804. One end of both the double-ended screw 702 and the double-ended screw 805 is connected to a turning head 9 for easy turning and rotation. A turning ring 10 is connected to one side of the surface of the metal housing 1 for easy turning and unscrewing of the shielding cover 3 and the metal housing 1. One end of the connecting wire 5 is connected to a power connector 11 for powering the coil inside the sensing head 4, thereby generating an alternating magnetic field. An anti-slip pad 12 is provided on one side of the clamping plate 806 to increase the friction when the clamping plate 806 is pressed against the proximity switch installation location.

[0027] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0028] In practical use, the two clamping plates 806 at the bottom of the positioning plate 803 are placed on both sides of the mounting bracket or support structure at the point to be tested. By manually rotating the bidirectional screw 805, the two clamping plates 806 are moved towards each other using the transmission characteristics of their opposite threads, thereby clamping and fixing the support structure. The anti-slip pads 12 provided on the inner side of the clamping plates 806 can effectively increase friction and prevent the device from loosening or shifting during operation. After the overall installation is completed, the opening size of the shielding cover 3 is precisely adjusted by the detection adjustment mechanism 7 according to the size and shape of the metal object being tested and the distance between adjacent objects. In specific operation, the screw head 9 located on one side of the shielding cover 3 is manually rotated to drive the internal bidirectional screw 702 to rotate. Because the threads on both sides of the bidirectional screw 702 are in opposite directions and are threadedly connected to the transmission blocks 703 at the bottom of the two shielding plates 6, when the bidirectional screw 702 rotates, the two transmission blocks 703 will move synchronously in opposite directions, thereby driving the shielding plates 6 on both sides to move closer or further apart within the shielding cover 3, achieving continuous adjustment of the rectangular opening width of the shielding interface. This opening faces the sensing head 4. The shielding cover 3 and shielding plates 6, made of low-carbon steel, have good magnetic permeability, effectively absorbing and confining the high-frequency alternating magnetic field generated by the coil, suppressing its diffusion to the sides and rear, and concentrating the magnetic field energy to be emitted forward from the adjusted rectangular opening, forming a detection area with strong directionality and controllable range. When the proximity switch is energized, the coil inside its sensing head 4 generates a high-frequency alternating electromagnetic field under the drive of the oscillator. This magnetic field, after being shaped by the shielding structure, only acts effectively within the set direction and range. When metal objects on the conveyor line pass through this restricted detection area one by one, a switch signal is triggered, completing the accurate detection of the metal objects.

[0029] The above description is only a preferred embodiment of the present utility model and is 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 should be included within the protection scope of the present utility model.

Claims

1. An inductive proximity switch, characterized in that, It includes a metal housing (1), the surface of the metal housing (1) is provided with mounting threads (2), the surface of the mounting threads (2) is threaded with a shield (3), one end of the metal housing (1) is connected to a sensor head (4), the other end is connected to a connecting wire (5), the shield (3) is slidably installed on both sides inside the shield (3), a detection and adjustment mechanism (7) is provided between the shield (3) and the shield (6), and a detection and positioning mechanism (8) is provided at the bottom of the shield (3).

2. An inductive proximity switch according to claim 1, characterized in that, The detection and adjustment mechanism (7) includes a transmission groove (701) on the inner bottom surface of the shield (3), a bidirectional screw (702) is rotatably installed inside the transmission groove (701), and a transmission block (703) is connected to the bottom of the shield (6). The transmission block (703) is threadedly connected to the bidirectional screw (702).

3. An inductive proximity switch according to claim 2, characterized in that, The detection and positioning mechanism (8) includes a limiting groove (801) at the bottom of the shield (3), a limiting block (802) is slidably installed inside the limiting groove (801), a positioning plate (803) is connected to the bottom of the limiting block (802), an adjustment groove (804) is opened on the bottom surface of the positioning plate (803), a double-acting screw (805) is rotatably installed inside the adjustment groove (804), and clamping plates (806) are threadedly connected to both sides of the surface of the double-acting screw (805).

4. An inductive proximity switch according to claim 3, characterized in that, Both the first (702) and the second (805) bidirectional screws are connected to a screwing head (9) at one end.

5. An inductive proximity switch according to claim 1, characterized in that, A screw ring (10) is connected to one side of the surface of the metal casing (1).

6. An inductive proximity switch according to claim 1, characterized in that, One end of the connecting wire (5) is connected to a power connector (11).

7. An inductive proximity switch according to claim 3, characterized in that, An anti-slip pad (12) is provided on one side of the clamping plate (806).

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