Misalignment switch

Abstract

This utility model discloses a deviation switch, including a first coil, a second coil, a sensing module, a control module, and an output module. The sensing module is connected to the first and second coils to drive them to oscillate and generate oscillation signals, and generates a sensing signal based on the oscillation signals. The control module is connected to the sensing module to generate a control signal based on the sensing signals, and the output module is connected to the control module to generate an output signal based on the control signal. This utility model's deviation switch replaces the microswitch in traditional solutions with a dual-coil structure. The first coil serves as a detection coil, and the second coil serves as a reference coil. When a metal target approaches the first coil, eddy currents are generated in the metal target, causing oscillation attenuation and reducing the inductance and oscillation frequency of the first coil. By detecting the first and second oscillation signals, the presence of a target can be identified, achieving non-contact detection.

Description

Technical Field

[0001] This utility model belongs to the field of precision measurement technology, and specifically relates to a deviation switch. Background Technology

[0002] Belt misalignment switches, also known as belt misalignment detection sensors, are primarily used to detect whether conveyor belts and other transport equipment are misaligned. They are widely used in conveyor systems, especially in industries such as mining, chemical, food processing, and warehousing logistics. Belt misalignment switches detect the belt's running status through physical or mechanical means. Once belt misalignment occurs, the sensor can issue an alarm or signal in real time, allowing for timely measures to prevent equipment damage or production interruptions. Particularly in automated production lines, belt misalignment detection sensors can effectively prevent material leakage, equipment damage, and reduced production efficiency caused by conveyor belt deviation from the track.

[0003] Despite significant progress in belt misalignment switching in industrial automation, challenges remain regarding high-precision measurement, response speed, and anti-interference capabilities. Particularly in complex environments, better suppression of electromagnetic interference and improved system compatibility and intelligence are key areas for future research. Therefore, future belt misalignment switch sensors will trend towards integrated, intelligent, and digital designs, combining with modern IoT technologies to achieve remote monitoring, data analysis, and early warning functions, further enhancing system reliability and production efficiency.

[0004] Traditional deviation switches typically use microswitches, which are activated by external pressure to transmit alarm signals. However, over long-term use, the microswitches can be deformed, affecting their accuracy and stability.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a belt misalignment switch that can provide contactless detection of belt misalignment.

[0007] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0008] A deviation switch includes a first coil, a second coil, a sensing module, a control module, and an output module. The sensing module is connected to the first coil and the second coil. The sensing module drives the first coil to oscillate and generate a first oscillation signal sensed by the target under test, drives the second coil to oscillate and generate a second oscillation signal, and generates a sensing signal based on the first oscillation signal and the second oscillation signal. The control module is connected to the sensing module to generate a control signal based on the sensing signal. The output module is connected to the control module to generate an output signal based on the control signal.

[0009] In one or more embodiments of the present invention, the output module includes a switch output unit, which is connected to the control module to generate the output signal in the form of a switch based on the control signal.

[0010] In one or more embodiments of this utility model, the switch output unit includes a first transistor, a first resistor, and a second resistor. The first end of the first resistor is connected to the control module to receive the control signal. The second end of the first resistor and the first end of the second resistor are connected to the control terminal of the first transistor. The second end of the second resistor and the first end of the first transistor are connected to ground voltage. The second end of the first transistor is used to generate the output signal.

[0011] In one or more embodiments of this utility model, the switching output unit further includes a first TVS diode, the first terminal of the first TVS diode being connected to the second terminal of the first transistor, and the second terminal of the first TVS diode being connected to ground voltage; and / or

[0012] The switching output unit further includes a first fuse, the first end of which is connected to the second end of the first transistor, and the second end of the first fuse is used to generate the output signal.

[0013] In one or more embodiments of this utility model, the switch output unit includes a first switch subunit, a second switch subunit, and a third resistor. The first switch subunit is connected to the control module to generate a switch signal based on the control signal. The second switch subunit is connected to the first switch subunit, the power supply voltage, and the first terminal of the third resistor. The second switch subunit controls the switching between the first terminal of the third resistor and the power supply voltage based on the switch signal to generate the output signal. The second terminal of the third resistor is connected to ground voltage.

[0014] In one or more embodiments of this utility model, the first switching subunit includes a fourth resistor, a fifth resistor, a sixth resistor, and a second transistor. The first terminal of the fourth resistor is connected to the control module to receive the control signal. The second terminals of the fourth resistor and the first terminals of the fifth resistor are connected to the control terminal of the second transistor. The second terminals of the fifth resistor and the first terminals of the second transistor are connected to ground. The second terminal of the second transistor is connected to the first terminal of the sixth resistor to generate the switching signal. The second terminal of the sixth resistor is connected to the power supply voltage; and / or

[0015] The second switching subunit includes a seventh resistor and a third transistor. The first end of the seventh resistor is connected to the first switching subunit to receive the switching signal. The second end of the seventh resistor is connected to the control terminal of the third transistor. The first end of the third transistor is connected to the power supply voltage, and the second end of the third transistor is connected to the first end of the third resistor.

[0016] In one or more embodiments of this utility model, the switching output unit further includes a second TVS diode, the first terminal of the second TVS diode being connected to the first terminal of the third resistor, and the second terminal of the second TVS diode being connected to ground; and / or

[0017] The switch output unit further includes a second fuse, the first end of which is connected to the first end of the third resistor, and the second end of which is used to generate the output signal.

[0018] In one or more embodiments of this utility model, the switching output unit includes a relay.

[0019] In one or more embodiments of this utility model, the deviation switch further includes a display module, which is connected to the control module to display based on the control signal.

[0020] In one or more embodiments of this utility model, the deviation switch further includes a circuit board and a housing. The first coil, the second coil, the sensing module, the control module and the output module are all disposed on the circuit board. The circuit board is installed inside the housing, and the housing is filled with potting compound.

[0021] Compared to existing technologies, this utility model's deviation switch replaces the microswitch in traditional solutions with a dual-coil structure. The first coil serves as a detection coil, and the second coil serves as a reference coil. When a metallic target approaches the first coil, eddy currents are generated within the target, causing oscillation attenuation and reducing the coil's inductance and oscillation frequency. By detecting the first and second oscillation signals and comparing the changes in the inductance difference and oscillation frequency between the two coils, the presence of an approaching target can be identified, achieving non-contact detection. Compared to existing products, this system boasts lower power consumption, higher safety performance, and can adapt to harsher working environments. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a system structure diagram of the deviation switch in one embodiment of the present invention.

[0024] Figure 2 This is a circuit diagram of the power supply module in one embodiment of the present invention.

[0025] Figure 3 This is a circuit diagram of the sensing module in one embodiment of the present invention.

[0026] Figure 4 This is a circuit diagram of the switch output unit in one embodiment of the present invention.

[0027] Figure 5 This is a circuit diagram of the switch output unit in another embodiment of the present invention.

[0028] Figure 6 This is a circuit diagram of the switch output unit in another embodiment of the present invention.

[0029] Figure 7 This is a circuit diagram of the display module in one embodiment of the present invention. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0031] The terms "coupled," "connected," or "linked" in this specification include both direct and indirect connections. Indirect connections are those made through an intermediate medium, such as those made through an electrically conductive medium, which may have parasitic inductance or capacitance. Indirect connections may also include connections made through other active or passive devices to achieve the same or similar functional purpose, such as connections through switches, follower circuits, or other circuits or components. Furthermore, in this specification, terms such as "first" and "second" are primarily used to distinguish one technical feature from another, and do not necessarily require or imply any actual relationship, quantity, or order between these technical features.

[0032] In the detailed description of this specification, reference is made to the accompanying drawings, which form a part thereof, wherein like reference numerals always denote like parts, and wherein exemplary embodiments are shown by way of example that may be implemented. It should be understood that other embodiments may be utilized, and structural or logical changes may be made, without departing from the scope of this application. Therefore, the following detailed description should not be considered limiting.

[0033] The various operations in the specification may be described sequentially as multiple discrete actions or operations in a manner most conducive to understanding the claimed subject matter. However, the order of description should not be construed as implying that these operations must be sequentially related. Specifically, these operations may not be performed in the order presented. The described operations may be performed in a different order than in the described embodiments. Various additional operations may be performed in additional embodiments and / or the described operations may be omitted.

[0034] For the purposes of this application, the phrase "A and / or B" means (A), (B), or (A and B). For the purposes of this application, the phrase "A, B and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).

[0035] Various components and devices may be mentioned or shown in the singular form herein, but only for the convenience of discussion, and any element mentioned in the singular form may include multiple such elements as taught herein.

[0036] The description uses the phrases "in one embodiment," "in other embodiments," or "in some embodiments," each of which can refer to one or more of the same or different embodiments. Furthermore, the terms "comprising," "including," "having," etc., used in relation to embodiments of this application are synonymous.

[0037] like Figure 1 As shown, in one embodiment of this utility model, the deviation switch includes a first coil L1, a second coil L2, a sensing module 10, a control module 20, an output module 30, a display module 40, and a power supply module 50.

[0038] The sensing module 10 is connected to the first coil L1 and the second coil L2. The sensing module 10 drives the first coil L1 to oscillate, generating a first oscillation signal sensed by the target object, and drives the second coil L2 to oscillate, generating a second oscillation signal. A sensing signal is generated based on the first and second oscillation signals. The control module 20 is connected to the sensing module 10 to generate a control signal based on the sensing signal. The output module 30 is connected to the control module 20 to generate an output signal based on the control signal. The display module 40 is connected to the control module 20 to display the signal based on the control signal. The power supply module 50 is connected to the sensing module 10, the control module 20, and the output module 30 to provide the required operating voltage for each module.

[0039] By replacing the microswitch in the traditional solution with a dual-coil structure, the first coil L1 serves as the detection coil, and the second coil L2 serves as the reference coil. When a metal target approaches the first coil L1, eddy currents are generated in the metal target, causing oscillation attenuation, reducing the inductance of the first coil L1, and increasing its oscillation frequency. The second coil L2 is unaffected. By detecting the first oscillation signal and the second oscillation signal, and comparing the change in the inductance difference and the change in the oscillation frequency of the two coils, it is possible to identify whether a target is approaching, thus achieving non-contact detection.

[0040] Meanwhile, since the measurement principle is based on induction, there is no physical contact between the misalignment switch and the object being measured. This reduces wear, friction, and signal interference, improving the switch's lifespan and reliability. Furthermore, the circuit board can be encapsulated, completely sealing components that might generate sparks or heat to ignite explosive mixtures within a composite or bonded non-metallic casing. This prevents the circuit board from igniting dust layers or explosive atmospheres under operating or installation conditions, thus meeting the requirements for encapsulated "m" protection equipment.

[0041] In one embodiment, the sensing module 10 drives a first coil L1 and a second coil L2 to oscillate at the same frequency. The inductance value of the first coil L1 is the same as the inductance value of the second coil L2.

[0042] like Figure 2As shown, the power module 50 includes a protection circuit 51 and a step-down circuit. The protection circuit 51 is connected to the 24V power supply voltage and is used to provide power input protection. The step-down circuit is connected to the protection circuit 51 and is used to step down the 24V power supply voltage to the required operating voltage.

[0043] Specifically, the step-down circuit includes step-down chip U1, step-down chip V1 and their peripheral circuits. Step-down chip U1 is used to reduce the power supply voltage to 5V, and step-down chip V1 is used to reduce the 5V voltage to 3.3V.

[0044] like Figure 3 As shown, the sensing module 10 includes an inductor comparator chip U3 and its peripheral circuits. The preferred signal for the inductor comparator chip U3 is LDC0851, which is an inductor comparator with push-pull output.

[0045] Pin 2 of the inductor comparator chip U3 is connected to the first end of the first coil L1, pin 3 of the inductor comparator chip U3 is connected to the first end of the second coil L2, and pin 1 of the inductor comparator chip U3 is connected to the second ends of both the first coil L1 and the second coil L2. Pin 5 of the inductor comparator chip U3 is used to generate a sensing signal.

[0046] The inductor comparator chip U3 can drive the first coil L1 and the second coil L2 to oscillate and detect the equivalent inductance values ​​of the first coil L1 and the second coil L2. When the inductance value of the first coil L1 is detected to be lower than the inductance value of the second coil L2, the inductor comparator chip U3 will generate a low-level sensing signal; when the inductance value of the first coil L1 is detected to be higher than or equal to the inductance value of the second coil L2, the inductor comparator chip U3 will generate a high-level sensing signal.

[0047] The output module 30 includes a digital output unit, which is connected to the control module 20 to generate a digital output signal based on the control signal.

[0048] In one embodiment, five digital output units are provided, namely digital output units 31 to 35, to meet the needs of different types of signal output.

[0049] like Figure 4 As shown, the switching output unit 31 includes a first transistor Q6, a first resistor R13, a second resistor R19, a first TVS diode D4, and a first fuse F1.

[0050] The first terminal of the first resistor R13 is connected to the control module 20 to receive the control signal PA6. The second terminals of the first resistor R13 and the first terminal of the second resistor R19 are connected to the control terminal of the first transistor Q6. The second terminals of the second resistor R19 and the first terminal of the first transistor Q6 are connected to ground. The first terminal of the first fuse F1 is connected to the second terminal of the first transistor Q6, and the second terminal of the first fuse F1 is used to generate the output signal NPN-NO. The first terminal of the first TVS diode D4 is connected to the second terminal of the first transistor Q6, and the second terminal of the first TVS diode D4 is connected to ground.

[0051] In one embodiment, when the sensing signal is low, the control module 20 generates a high-level control signal PA6, the first transistor Q6 is turned on, and a low-level output signal NPN-NO is output; when the sensing signal is high, the control module 20 generates a low-level control signal PA6, the first transistor Q6 is turned off, and no output signal NPN-NO is output (or the output signal NPN-NO is off).

[0052] In other embodiments, the first fuse F1 may be omitted, and the output signal NPN-NO may be generated through the second terminal of the first transistor Q6. In other embodiments, the first TVS diode D4 may also be omitted.

[0053] The circuit structure of the digital output unit 32 is the same as that of the digital output unit 31. The only difference is that it receives the control signal PA7 generated by the control module 20 and generates the output signal NPN-NC. The control logic of the control signal PA7 is the opposite of that of the control signal PA6. Specifically, when the sensing signal is low, the control module 20 generates a low-level control signal PA7 and does not output the output signal NPN-NC (or the output signal NPN-NC is off); when the sensing signal is high, the control module 20 generates a high-level control signal PA7 and the output signal NPN-NC is low.

[0054] like Figure 5As shown, the switch output unit 33 includes a first switch subunit, a second switch subunit, a third resistor R21, a second TVS diode D6, and a second fuse F3. The first switch subunit is connected to the control module 20 to generate a switch signal based on the control signal PA0. The second switch subunit is connected to the first switch subunit, the power supply voltage, and the first terminal of the third resistor R21. The second switch subunit controls the switching between the first terminal of the third resistor R21 and the power supply voltage based on the switch signal. The first terminal of the second fuse F3 is connected to the first terminal of the third resistor R21, and the second terminal of the second fuse F3 is used to generate the output signal PNP-NO. The second terminal of the third resistor R21 is connected to ground. The first terminal of the second TVS diode D6 is connected to the first terminal of the third resistor R21, and the second terminal of the second TVS diode D6 is connected to ground.

[0055] In other embodiments, the second fuse F3 may be omitted, and the output signal PNP-NO may be generated through the first terminal of the third resistor R21. In other embodiments, the second TVS diode D6 may also be omitted.

[0056] The first switching subunit includes a fourth resistor R15, a fifth resistor R16, a sixth resistor R9, and a second transistor Q3. The first end of the fourth resistor R15 is connected to the control module 20 to receive the control signal PA0. The second ends of the fourth resistor R15 and the first ends of the fifth resistor R16 are connected to the control terminal of the second transistor Q3. The second ends of the fifth resistor R16 and the first ends of the second transistor Q3 are connected to the ground voltage. The second end of the second transistor Q3 is connected to the first end of the sixth resistor R9 to generate a switching signal. The second end of the sixth resistor R9 is connected to the power supply voltage.

[0057] The second switching subunit includes a seventh resistor R11 and a third transistor Q2. The first end of the seventh resistor R11 is connected to the first switching subunit to receive a switching signal. The second end of the seventh resistor R11 is connected to the control terminal of the third transistor Q2. The first end of the third transistor Q2 is connected to the power supply voltage. The second end of the third transistor Q2 is connected to the first end of the third resistor R21.

[0058] In one embodiment, when the sensing signal is low, the control module 20 generates a low-level control signal PA0, the second transistor Q3 is turned off, the switch signal is high, the third transistor Q2 is turned off, and the output signal PNP-NO is low; when the sensing signal is high, the control module 20 generates a high-level control signal PA0, the second transistor Q3 is turned on, the switch signal is low, the third transistor Q2 is turned on, and the output signal PNP-NO is high.

[0059] The circuit structure of the switch output unit 34 is the same as that of the switch output unit 33. The only difference is that it receives the control signal PA1 generated by the control module 20 and generates the output signal PNP-NC. The control logic of the control signal PA1 is the opposite of that of the control signal PA0. Specifically, when the sensing signal is low, the control module 20 generates a high-level control signal PA1 and the output signal PNP-NC is high; when the sensing signal is high, the control module 20 generates a low-level control signal PA1 and the output signal PNP-NC is low.

[0060] In one embodiment, the first transistor Q6 and the second transistor Q3 are NPN transistors, and the third transistor Q2 is a PNP transistor. The first terminal of the first transistor Q6, the first terminal of the second transistor Q3, and the first terminal of the third transistor Q2 are emitters; the second terminals of the first transistor Q6, the second terminal of the second transistor Q3, and the second terminal of the third transistor Q2 are collectors; and the control terminals of the first transistor Q6, the second transistor Q3, and the third transistor Q2 are bases.

[0061] In other embodiments, the first transistor Q6 and the second transistor Q3 may also be PNP transistors or other types of transistor devices, and the third transistor Q2 may also be an NPN transistor or other types of transistor devices, in which case the connection method of each transistor is adapted accordingly.

[0062] like Figure 6 As shown, the digital output unit 35 includes a relay, the coil of which is connected to the control module 20 to generate an output signal COM based on the control signal PB1 by controlling the contacts of the relay.

[0063] Furthermore, the digital output unit 35 also includes resistors R6 and R8, transistor Q1, and diode D3. The first terminal of resistor R6 is connected to the control module 20 to receive the control signal PB1. The second terminals of resistor R6 and R8 are connected to the control terminal of transistor Q1. The second terminals of R8 and Q1 are connected to ground. The second terminal of transistor Q1 and the anode of diode D3 are connected to the first terminal of the relay coil. The second terminal of the relay coil is connected to a 3.3V operating voltage. Resistors R6 and R8, and transistor Q1 are used to convert the control signal PB1, and diode D3 is used for voltage regulation.

[0064] In one embodiment, when the sensing signal is low, the control module 20 generates a high-level control signal PB1, transistor Q1 is turned on, the relay coil is energized, and the relay contacts close with the normally open terminal NO; when the sensing signal is high, the control module 20 generates a low-level control signal PB1, transistor Q1 is turned off, the relay coil is not energized, and the relay contacts close with the normally closed terminal NC. The normally closed terminals NC and NO can be selectively connected to either power or ground voltage as needed.

[0065] In other embodiments, the output module 30 may also include one or more of the above-described switch output units.

[0066] like Figure 7 As shown, the display module 40 includes a resistor R1 and a light-emitting diode LED-Y1. The first end of the resistor R1 is connected to the control module 20 to receive the control signal PA8, the second end of the resistor R1 is connected to the anode of the light-emitting diode LED-Y1, and the cathode of the light-emitting diode LED-Y1 is connected to ground voltage.

[0067] In one embodiment, when the sensing signal is low, the control module 20 generates a high-level control signal PA8, and the light-emitting diode LED-Y1 illuminates; when the sensing signal is high, the control module 20 generates a low-level control signal PA8, and the light-emitting diode LED-Y1 does not illuminate.

[0068] In one embodiment, the control module 20 may include an MCU chip, which can be selected according to actual needs.

[0069] In one embodiment, the deviation switch further includes a circuit board and a housing. The first coil L1, the second coil L2, the sensing module 10, the control module 20, the output module 30, the display module 40, and the power module 50 are all disposed on the circuit board. The circuit board is installed inside the housing, and the housing is filled with potting compound.

[0070] The deviation switch of this utility model uses a dual coil instead of a micro switch. When the target of the metal conveyor belt approaches the first coil L1 and reaches the sensing distance, the inductance value of the first coil L1 will be lower than the inductance value of the second coil L2. After the sensing module 10 detects this change, it generates a corresponding sensing signal. The control module 20 further controls the output module 30 to output.

[0071] Non-contact sensing detection reduces wear, friction, and signal interference, improving the lifespan and reliability of the misalignment switch. Furthermore, the circuit PCB can be encapsulated to completely seal components that may generate sparks or heat, potentially igniting explosive mixtures, within a composite or bonded non-metallic shell. This prevents the ignition of dust layers or explosive environments under operating or installation conditions, thus meeting the requirements for encapsulated "m" protection equipment.

[0072] This utility model's misalignment switch integrates five signal outputs commonly found on the market: relay signal and PNP(NO)\PNP(NC)\NPN(NO) / NPN(NC), increasing the customer's selectivity for output signals.

[0073] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0074] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A belt misalignment switch, characterized in that, The system includes a first coil, a second coil, a sensing module, a control module, and an output module. The sensing module is connected to the first coil and the second coil. The sensing module drives the first coil to oscillate and generate a first oscillation signal sensed by the target, drives the second coil to oscillate and generate a second oscillation signal, and generates a sensing signal based on the first oscillation signal and the second oscillation signal. The control module is connected to the sensing module to generate a control signal based on the sensing signal. The output module is connected to the control module to generate an output signal based on the control signal.

2. The belt misalignment switch according to claim 1, characterized in that, The output module includes a switch output unit, which is connected to the control module to generate the output signal in the form of a switch based on the control signal.

3. The belt misalignment switch according to claim 2, characterized in that, The switch output unit includes a first transistor, a first resistor, and a second resistor. The first end of the first resistor is connected to the control module to receive the control signal. The second end of the first resistor and the first end of the second resistor are connected to the control terminal of the first transistor. The second end of the second resistor and the first end of the first transistor are connected to ground voltage. The second end of the first transistor is used to generate the output signal.

4. The belt misalignment switch according to claim 3, characterized in that, The switch output unit further includes a first TVS diode, the first terminal of which is connected to the second terminal of the first transistor, and the second terminal of which is connected to ground; and / or The switching output unit further includes a first fuse, the first end of which is connected to the second end of the first transistor, and the second end of the first fuse is used to generate the output signal.

5. The belt misalignment switch according to claim 2, characterized in that, The switch output unit includes a first switch subunit, a second switch subunit, and a third resistor. The first switch subunit is connected to the control module to generate a switch signal based on the control signal. The second switch subunit is connected to the first switch subunit, the power supply voltage, and the first terminal of the third resistor. The second switch subunit controls the connection and disconnection between the first terminal of the third resistor and the power supply voltage based on the switch signal to generate the output signal. The second terminal of the third resistor is connected to ground voltage.

6. The belt misalignment switch according to claim 5, characterized in that, The first switching subunit includes a fourth resistor, a fifth resistor, a sixth resistor, and a second transistor. The first terminal of the fourth resistor is connected to the control module to receive the control signal. The second terminals of the fourth resistor and the first terminals of the fifth resistor are connected to the control terminal of the second transistor. The second terminals of the fifth resistor and the first terminals of the second transistor are connected to ground. The second terminal of the second transistor is connected to the first terminal of the sixth resistor to generate the switching signal. The second terminal of the sixth resistor is connected to the power supply voltage; and / or The second switching subunit includes a seventh resistor and a third transistor. The first end of the seventh resistor is connected to the first switching subunit to receive the switching signal. The second end of the seventh resistor is connected to the control terminal of the third transistor. The first end of the third transistor is connected to the power supply voltage, and the second end of the third transistor is connected to the first end of the third resistor.

7. The belt misalignment switch according to claim 5, characterized in that, The switch output unit further includes a second TVS diode, the first terminal of which is connected to the first terminal of the third resistor, and the second terminal of which is connected to ground; and / or The switch output unit further includes a second fuse, the first end of which is connected to the first end of the third resistor, and the second end of which is used to generate the output signal.

8. The belt misalignment switch according to claim 2, characterized in that, The switch output unit includes a relay.

9. The belt misalignment switch according to claim 1, characterized in that, The deviation switch also includes a display module, which is connected to the control module to display based on the control signal.

10. The belt misalignment switch according to claim 1, characterized in that, The deviation switch also includes a circuit board and a housing. The first coil, the second coil, the sensing module, the control module and the output module are all disposed on the circuit board. The circuit board is installed inside the housing, and the housing is filled with potting compound.

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