Level rod tilt alarm device

Abstract

The application provides a leveling rod inclination alarm device, belonging to the technical field of inclination detection. The leveling rod inclination alarm device comprises a constant current module, an inclination detection module, an inclination judgment module and an inclination alarm module; the constant current module, the inclination detection module, the inclination judgment module and the inclination alarm module are all arranged on a centering rod; a power supply end of the inclination detection module is connected with the constant current module, the inclination detection module is configured to detect whether the centering rod is inclined, an output end of the inclination detection module is connected with an input end of the inclination judgment module, an output end of the inclination judgment module is connected with the inclination alarm module, and the inclination alarm module is configured to send an inclination alarm signal. The application can improve the measurement accuracy of the level.

Description

Technical Field

[0001] This application relates to the field of tilt detection technology, and in particular to a leveling rod tilt alarm device. Background Technology

[0002] In the field of leveling, the centering rod is a key tool supporting the leveling rod, and its vertical stability directly affects the measurement accuracy. Traditional leveling rods rely on the operator's visual observation or a simple bubble level to determine whether the centering rod is tilted. This method has problems such as strong subjectivity and slow response, and is prone to misjudgment, especially in strong light, vibration, or nighttime working environments, leading to the accumulation of measurement errors. Utility Model Content

[0003] This application provides a leveling rod tilt alarm device to improve the measurement accuracy of the level instrument.

[0004] This application provides a leveling rod tilt alarm device, including: a constant current module, a tilt detection module, a tilt judgment module, and a tilt alarm module;

[0005] The constant current module, tilt detection module, tilt judgment module and tilt alarm module are all mounted on the centering rod;

[0006] The power supply terminal of the tilt detection module is connected to the constant current module. The tilt detection module is configured to detect whether the centering rod is tilted. The output terminal of the tilt detection module is connected to the input terminal of the tilt judgment module. The output terminal of the tilt judgment module is connected to the tilt alarm module. The tilt alarm module is configured to issue a tilt alarm signal.

[0007] In one exemplary embodiment of this application, the tilt detection module includes an acceleration sensor U3;

[0008] The power supply terminal of the accelerometer U3 is connected to the constant current module, and the output terminal of the accelerometer U3 is connected to the tilt detection module.

[0009] The acceleration sensor U3 is configured to detect whether the centering rod is tilted.

[0010] In one exemplary embodiment of this application, the constant current module includes: operational amplifier U2, transistor Q2, resistor R3, and resistor R4;

[0011] The non-inverting input of operational amplifier U2 is connected to a reference voltage, the inverting input of operational amplifier U2 is connected to the VCC power supply, the output of operational amplifier U2 is connected to the base of transistor Q2, the collector of transistor Q2 is connected to the VCC power supply through resistor R3, the emitter of transistor Q2 is grounded through resistor R4, and the emitter of transistor Q2 is connected to the power supply of the tilt detection module.

[0012] In one exemplary embodiment of this application, the constant current module further includes: a voltage regulator U1, a capacitor C1, a capacitor C2, a resistor R1, and a capacitor C2;

[0013] The first terminal of the voltage regulator U1 is connected to the VCC power supply, the second terminal of the voltage regulator U1 is grounded, the first terminal of the voltage regulator U1 is grounded through the capacitor C1, the third terminal of the voltage regulator U1 is connected to the VCC power supply, the fourth terminal of the voltage regulator U1 is grounded through the resistor R1, the capacitor C2 is connected in parallel with the resistor R1, and the fourth terminal of the voltage regulator U1 is used to output a reference voltage.

[0014] In one exemplary embodiment of this application, the tilt determination module includes a resistor R5, a diode D1, a diode D2, a resistor R6, an operational amplifier U5, an operational amplifier U4, and a NAND gate U6;

[0015] The first end of resistor R5 is connected to VCC power supply, the second end of resistor R5 is connected to the anode of diode D1, the cathode of diode D1 is connected to the anode of diode D2, the cathode of diode D2 is grounded through resistor R6, the second end of resistor R5 is connected to the non-inverting input terminal of operational amplifier U5, and the cathode of diode D2 is connected to the inverting input terminal of operational amplifier U4.

[0016] The inverting input of operational amplifier U5 is connected to the non-inverting input of operational amplifier U4. The non-inverting input of operational amplifier U4 is connected to the output of the tilt detection module. The output of operational amplifier U5 is connected to the first input of NAND gate U6. The output of operational amplifier U4 is connected to the second input of NAND gate U6. The output of NAND gate U6 is connected to the tilt alarm module.

[0017] In one exemplary embodiment of this application, the tilt alarm module includes LED1 and LED2;

[0018] The anode of LED1 is connected to the VCC power supply, the cathode of LED1 is connected to the output terminal of the tilt detection module, the cathode of LED1 is connected to the anode of LED2, and the cathode of LED2 is grounded.

[0019] In one exemplary embodiment of this application, it further includes: an isolation module, a wireless communication module, a control module, and a display module;

[0020] The isolation module and wireless communication module are mounted on the centering rod, and the control module and display module are mounted on the level.

[0021] The input terminal of the isolation module is connected to the output terminal of the tilt detection module, the output terminal of the isolation module is connected to the input terminal of the wireless communication module, the output terminal of the wireless communication module is communicatively connected to the control module, and the control module is connected to the display module.

[0022] In one exemplary embodiment of this application, the isolation module includes NOT gate U7 and NOT gate U8;

[0023] The input terminal of NOT gate U7 is connected to the output terminal of the tilt detection module, the output terminal of NOT gate U7 is connected to the input terminal of NOT gate U8, and the output terminal of NOT gate U8 is connected to the wireless communication module.

[0024] The beneficial effects of the leveling rod tilt alarm device provided in this application are as follows: By integrating a constant current module, a tilt detection module, a tilt judgment module, and a tilt alarm module into the centering rod, this application achieves localized real-time monitoring and rapid response to tilt status. Constant current power supply ensures the stability of the detection module and avoids misjudgments caused by voltage fluctuations; the tilt detection module accurately senses the rod's tilt, and after the output signal is compared with a preset threshold by the judgment module, it triggers the audible and visual alarm module to remind the operator to adjust in time, effectively avoiding leveling measurement errors caused by the tilt of the centering rod, thereby improving the measurement accuracy of the level instrument. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, 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 of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the leveling rod tilt alarm device provided in the embodiments of this application;

[0027] Figure 2 This is a circuit diagram of the leveling rod tilt alarm device provided in the embodiments of this application. Detailed Implementation

[0028] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0029] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0030] The implementation of this application will be described in detail below with reference to the specific accompanying drawings:

[0031] Figure 1 This is a structural schematic diagram of a leveling rod tilt alarm device provided in an embodiment of this application. (Refer to...) Figure 1 The leveling rod tilt alarm device includes: a constant current module, a tilt detection module, a tilt judgment module, and a tilt alarm module;

[0032] The constant current module, tilt detection module, tilt judgment module, and tilt alarm module are all mounted on the centering rod.

[0033] The power supply terminal of the tilt detection module is connected to the constant current module. The tilt detection module is configured to detect whether the centering rod is tilted. The output terminal of the tilt detection module is connected to the input terminal of the tilt judgment module. The output terminal of the tilt judgment module is connected to the tilt alarm module. The tilt alarm module is configured to issue a tilt alarm signal.

[0034] In this embodiment, the constant current module provides a stable current to the tilt detection module, ensuring a stable power supply to the tilt detection module. A constant current avoids instability in the detection signal (e.g., sensor sensitivity drift) caused by voltage fluctuations or load changes, ensuring that the tilt detection module always operates under preset electrical parameters, thus improving detection accuracy and reliability.

[0035] The tilt detection module is used to monitor the tilt state of the centering rod in real time. After receiving power from the constant current module, it initiates real-time monitoring of the tilt state of the centering rod. In this embodiment, a MEMS accelerometer or tilt sensor (such as an electrolyte type, capacitive type, or optical type) can be used to determine the tilt by measuring the change in the angle between the direction of gravity and the axis of the rod. The tilt detection module can convert the detected physical tilt amount into an electrical signal (such as voltage, current, or digital pulse) for output.

[0036] The tilt detection module receives electrical signals from the tilt detection module and compares them with a preset tilt threshold. If the detected signal exceeds the threshold (e.g., tilt angle > preset X degrees), it is determined to be a "dangerous tilt" and an alarm is triggered; if the threshold is not exceeded, it is determined to be a "safe state" and no alarm is triggered.

[0037] The tilt alarm module is used to issue a warning signal when alarm conditions are met. Upon receiving the "dangerous tilt" command from the tilt judgment module, the tilt alarm module immediately executes the alarm action. The alarm can be acoustic, such as a high-frequency buzzer sound; optical, such as flashing LEDs (e.g., a red warning light); or a combination of both, such as simultaneous sound and light alerts. This intuitive warning prompts the operator to quickly adjust the centering rod's posture to restore its verticality, ensuring the accuracy of measurement data. If the distance is too far, the alarm signal can be a light signal, allowing the operator to observe whether the centering rod has issued a tilt alarm signal using a level.

[0038] As can be seen from the above, this embodiment integrates the constant current module, tilt detection module, tilt judgment module, and tilt alarm module into the centering rod, achieving localized real-time monitoring and rapid response to tilt status. Constant current power supply ensures the stability of the detection module, avoiding misjudgments caused by voltage fluctuations; the tilt detection module accurately senses the rod's tilt, and after the output signal is compared with a preset threshold by the judgment module, it triggers the audible and visual alarm module to remind the operator to make timely adjustments, effectively avoiding leveling measurement errors caused by the tilt of the centering rod.

[0039] like Figure 2 As shown, in one embodiment of this disclosure, the tilt detection module includes an acceleration sensor U3;

[0040] The power supply terminal of the accelerometer U3 is connected to the constant current module, and the output terminal of the accelerometer U3 is connected to the tilt detection module.

[0041] Accelerometer U3 is configured to detect whether the centering rod is tilted.

[0042] In this embodiment, the acceleration sensor U3 can be a MEMS acceleration sensor.

[0043] The U3 accelerometer sensor is based on microelectromechanical systems (MEMS) technology. Its core sensing unit is a cantilever beam or capacitor plate structure, which measures the tilt angle by detecting inertial force (gravitational component). The specific process is as follows:

[0044] When the centering rod is vertical, the sensor is only affected by gravity, and its output signal corresponds to the component of gravitational acceleration along the Z-axis (vertical direction). When the centering rod tilts, the components of gravitational acceleration along the sensor's sensitive axes (such as the X / Y / Z axes) change. For example, when the rod tilts forward, the Z-axis component of gravity decreases, while the X-axis component increases. The sensor calculates the tilt angle (usually through trigonometric function conversion) by detecting the changes in acceleration values ​​along each axis. The sensor converts the tilt angle into an electrical signal (such as a voltage value, digital quantity, or I²C / SPI interface data) and transmits it to the tilt detection module. In this embodiment, the change in the Z-axis component is sufficient to determine whether the centering rod is tilted.

[0045] In this embodiment, the tilt detection module may include an angular velocity sensor (such as a gyroscope) in addition to the accelerometer U3. The angular velocity sensor can detect the angular velocity change of the centering rod, thus achieving tilt detection. Furthermore, by combining the angular velocity sensor with the accelerometer, the dynamic tilt process can be captured more accurately, reducing misjudgments by a single sensor during vibrations or instantaneous swaying, improving the comprehensiveness and reliability of tilt detection, and further ensuring the accuracy of leveling measurements.

[0046] like Figure 2 As shown, in one embodiment of this disclosure, the constant current module includes: operational amplifier U2, transistor Q2, resistor R3, and resistor R4;

[0047] The non-inverting input of op-amp U2 is connected to the reference voltage, the inverting input of op-amp U2 is connected to the VCC power supply, the output of op-amp U2 is connected to the base of transistor Q2, the collector of transistor Q2 is connected to the VCC power supply through resistor R3, the emitter of transistor Q2 is grounded through resistor R4, and the emitter of transistor Q2 is connected to the power supply of the tilt detection module.

[0048] In this embodiment, operational amplifier U2, transistor Q2, resistor R3, and resistor R4 constitute a constant current source circuit based on operational amplifier feedback control.

[0049] The non-inverting input of op-amp U2 is connected to a stable reference voltage, such as that provided by a Zener diode or a reference voltage chip (let's say Vref).

[0050] The inverting input of op-amp U2 is connected to the CC power supply, forming a voltage difference comparison with the non-inverting input. Op-amp U2 can compare the voltage difference between the non-inverting and non-inverting inputs in real time and adjust the voltage at the output to bring them into balance. Since VCC is usually much higher than Vref, the op-amp output will output a high level to drive transistor Q2. When the load (tilt detection module) current changes, causing fluctuations in the emitter voltage (Ve) of transistor Q2, op-amp U2 quickly adjusts the base current of Q2 through a negative feedback mechanism to maintain a stable emitter current. The output current is determined by the reference voltage Vref and resistor R4, and is essentially independent of VCC voltage fluctuations or load resistance changes, achieving constant current characteristics.

[0051] When the impedance change of the tilt detection module (such as a change in the internal circuit state of the sensor) causes fluctuations in the load current demand, the emitter voltage Ve of transistor Q2 will change accordingly. However, due to the negative feedback effect of operational amplifier U2, the base current of Q2 will be quickly adjusted to maintain Ve≈Vref, thereby ensuring that Ic remains basically constant.

[0052] Even if the VCC power supply voltage fluctuates (such as the voltage drop when powered by battery), since the op-amp controls the balance between Vref and Ve, as long as Vref is stable, Ic remains unchanged, thus achieving a stable power supply to the tilt detection module.

[0053] like Figure 2 As shown, in one embodiment of this disclosure, the constant current module further includes: a voltage regulator U1, a capacitor C1, a capacitor C2, a resistor R1, and a capacitor C2;

[0054] The first terminal of voltage regulator U1 is connected to the VCC power supply, the second terminal of voltage regulator U1 is grounded, the first terminal of voltage regulator U1 is grounded through capacitor C1, the third terminal of voltage regulator U1 is connected to the VCC power supply, the fourth terminal of voltage regulator U1 is grounded through resistor R1, capacitor C2 is connected in parallel with resistor R1, and the fourth terminal of voltage regulator U1 is used to output the reference voltage.

[0055] In this embodiment, the voltage regulator U1 can output a stable voltage (e.g., 2.5V or 1.25V) that is almost unaffected by VCC fluctuations through its internal precision voltage divider network and feedback control mechanism, which serves as the reference signal for the constant current module.

[0056] like Figure 2 As shown, in one embodiment of this disclosure, the tilt detection module includes a resistor R5, a diode D1, a diode D2, a resistor R6, an operational amplifier U5, an operational amplifier U4, and a NAND gate U6;

[0057] The first end of resistor R5 is connected to the VCC power supply, the second end of resistor R5 is connected to the anode of diode D1, the cathode of diode D1 is connected to the anode of diode D2, the cathode of diode D2 is grounded through resistor R6, the second end of resistor R5 is connected to the non-inverting input of operational amplifier U5, and the cathode of diode D2 is connected to the inverting input of operational amplifier U4.

[0058] The inverting input of operational amplifier U5 is connected to the non-inverting input of operational amplifier U4. The non-inverting input of operational amplifier U4 is connected to the output of the tilt detection module. The output of operational amplifier U5 is connected to the first input of NAND gate U6. The output of operational amplifier U4 is connected to the second input of NAND gate U6. The output of NAND gate U6 is connected to the tilt alarm module.

[0059] In this embodiment, the tilt detection module uses a window comparator structure to detect the tilt state: resistor R5 and diodes D1 and D2 are connected in series to divide the voltage and generate a reference voltage Vref (e.g., 1.4V), which is connected to the non-inverting input of operational amplifier U5; the tilt signal output by the tilt detection module is simultaneously sent to the non-inverting input of operational amplifier U4; the inverting input of operational amplifier U4 is grounded (or fixed at a low voltage), forming an inverting comparator, which outputs a high level when the tilt signal > Vref; the inverting input of operational amplifier U5 is connected to a fixed high voltage (e.g., VCC), forming a non-inverting comparator, which outputs a high level when the tilt signal < Vref; the NAND gate U6 takes the inverse AND of the outputs of the two operational amplifiers, that is, an alarm is triggered only when the tilt signal is simultaneously > Vref (U4 output high) and < another threshold (U5 output high, circuit adjustment required) – in reality, it should be a dual-limit comparison: U4 detects whether the signal exceeds the upper limit (connected to Vref), and U5 detects whether it exceeds the lower limit (connected to a lower reference voltage). When both exceed the limits simultaneously (output high level), the NAND gate outputs a low level alarm, thereby accurately identifying significant tilt and filtering out minor interference.

[0060] As can be seen from the above, the tilt detection module forms a stable reference voltage through the voltage divider of diodes D1 and D2, and forms a dual comparator structure with operational amplifiers U5 and U4. The NAND gate U6 realizes the logic judgment, which can accurately identify the tilt state of the centering rod, effectively filter out small interference signals, avoid false alarms, improve the accuracy and reliability of tilt detection, and ensure the accuracy of leveling measurement.

[0061] like Figure 2 As shown, in one embodiment of this disclosure, the tilt alarm module includes LED1 and LED2;

[0062] The anode of LED1 is connected to the VCC power supply, the cathode of LED1 is connected to the output terminal of the tilt detection module, the cathode of LED1 is connected to the anode of LED2, and the cathode of LED2 is grounded.

[0063] In this embodiment, when the NAND gate U6 outputs a low level, LED1 lights up; when the NAND gate U6 outputs a high level, LED2 lights up. By observing the on / off state of LED1 and LED2, it can be determined whether the centering rod is tilted. For ease of observation, LED1 and LED2 can be LEDs of different colors.

[0064] Assume that LED1 emits red light and LED2 emits green light.

[0065] When the NAND gate U6 outputs a low level (indicating that the tilt detection module has detected a significant tilt), current flows through the VCC power supply → anode of LED1 → cathode of LED1 (at this time, the cathode voltage of LED1 is pulled low), forming a conducting circuit, and LED1 emits red light. Simultaneously, the cathode of LED1 is directly connected to the anode of LED2, and LED2 is cut off and extinguished due to the pulled-low anode voltage. Conversely, when the NAND gate U6 outputs a high level (indicating the centering rod is in a normal vertical state), LED1 is cut off due to the raised cathode voltage, and the high-level output of NAND gate U6 passes through LED2, causing LED1 to emit green light. In this way, the operator can quickly identify the tilt state: a bright red light indicates a dangerous tilt requiring adjustment, while a bright green light indicates the centering rod is vertical and requires no intervention, achieving immediate and visual alarm feedback.

[0066] like Figure 1 As shown in one embodiment of this disclosure, it further includes: an isolation module, a wireless communication module, a control module, and a display module;

[0067] The isolation module and wireless communication module are mounted on the centering rod, while the control module and display module are mounted on the level.

[0068] The input of the isolation module is connected to the output of the tilt detection module, the output of the isolation module is connected to the input of the wireless communication module, the output of the wireless communication module is connected to the control module, and the control module is connected to the display module.

[0069] In this embodiment, a remote tilt monitoring system is constructed using an isolation module, a wireless communication module, a control module, and a display module. The isolation module on the centering rod receives the alarm signal output by the tilt judgment module, performs electrical isolation to eliminate ground loop interference, and then transmits the signal to the wireless communication module. The wireless communication module (such as Bluetooth or Wi-Fi) wirelessly sends the alarm information to the control module at the level instrument, avoiding the inconvenience of wired connections. After parsing the received signal, the control module drives the display module (such as an LCD screen or LED indicator) to display the tilt status of the centering rod in real time. This embodiment achieves wireless interconnection between the measurement site and the operating terminal, allowing operators to remotely monitor the tilt status without close observation of the centering rod, improving measurement efficiency and safety, and is particularly suitable for leveling scenarios involving complex terrain or multiple personnel.

[0070] like Figure 2 As shown, in one embodiment of this disclosure, the isolation module includes NOT gate U7 and NOT gate U8;

[0071] The input of NOT gate U7 is connected to the output of the tilt detection module, the output of NOT gate U7 is connected to the input of NOT gate U8, and the output of NOT gate U8 is connected to the wireless communication module.

[0072] In this embodiment, the isolation module uses two NOT gates (NOT gate U7 and NOT gate U8) to form an inverter cascade circuit to achieve signal isolation. The output signal of the tilt detection module is inverted by NOT gate U7 and then inverted twice by NOT gate U8 to restore the original logic state, eliminating interference from the preceding circuit. The cascaded structure enhances the signal driving capability, and the simple structure of the NOT gate can block the ground loop current, avoiding interference caused by the potential difference between the preceding and following circuits, and ensuring that the wireless communication module receives a stable and clean tilt alarm signal.

[0073] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A leveling rod tilt alarm device, characterized in that, include: Constant current module, tilt detection module, tilt judgment module and tilt alarm module; The constant current module, tilt detection module, tilt judgment module and tilt alarm module are all mounted on the centering rod; The power supply terminal of the tilt detection module is connected to the constant current module. The tilt detection module is configured to detect whether the centering rod is tilted. The output terminal of the tilt detection module is connected to the input terminal of the tilt judgment module. The output terminal of the tilt judgment module is connected to the tilt alarm module. The tilt alarm module is configured to issue a tilt alarm signal.

2. The leveling rod tilt alarm device as described in claim 1, characterized in that, The tilt detection module includes an acceleration sensor U3; The power supply terminal of the accelerometer U3 is connected to the constant current module, and the output terminal of the accelerometer U3 is connected to the tilt detection module. The acceleration sensor U3 is configured to detect whether the centering rod is tilted.

3. The leveling rod tilt alarm device as described in claim 1, characterized in that, The constant current module includes: operational amplifier U2, transistor Q2, resistor R3 and resistor R4; The non-inverting input of operational amplifier U2 is connected to a reference voltage, the inverting input of operational amplifier U2 is connected to the VCC power supply, the output of operational amplifier U2 is connected to the base of transistor Q2, the collector of transistor Q2 is connected to the VCC power supply through resistor R3, the emitter of transistor Q2 is grounded through resistor R4, and the emitter of transistor Q2 is connected to the power supply of the tilt detection module.

4. The leveling rod tilt alarm device as described in claim 3, characterized in that, The constant current module also includes: a voltage regulator U1, a capacitor C1, a capacitor C2, a resistor R1, and a capacitor C2; The first terminal of the voltage regulator U1 is connected to the VCC power supply, the second terminal of the voltage regulator U1 is grounded, the first terminal of the voltage regulator U1 is grounded through the capacitor C1, the third terminal of the voltage regulator U1 is connected to the VCC power supply, the fourth terminal of the voltage regulator U1 is grounded through the resistor R1, the capacitor C2 is connected in parallel with the resistor R1, and the fourth terminal of the voltage regulator U1 is used to output a reference voltage.

5. The leveling rod tilt alarm device as described in claim 1, characterized in that, The tilt detection module includes resistor R5, diode D1, diode D2, resistor R6, operational amplifier U5, operational amplifier U4, and NAND gate U6; The first end of resistor R5 is connected to VCC power supply, the second end of resistor R5 is connected to the anode of diode D1, the cathode of diode D1 is connected to the anode of diode D2, the cathode of diode D2 is grounded through resistor R6, the second end of resistor R5 is connected to the non-inverting input terminal of operational amplifier U5, and the cathode of diode D2 is connected to the inverting input terminal of operational amplifier U4. The inverting input of operational amplifier U5 is connected to the non-inverting input of operational amplifier U4. The non-inverting input of operational amplifier U4 is connected to the output of the tilt detection module. The output of operational amplifier U5 is connected to the first input of NAND gate U6. The output of operational amplifier U4 is connected to the second input of NAND gate U6. The output of NAND gate U6 is connected to the tilt alarm module.

6. The leveling rod tilt alarm device as described in claim 1, characterized in that, The tilt alarm module includes LED1 and LED2; The anode of LED1 is connected to the VCC power supply, the cathode of LED1 is connected to the output terminal of the tilt detection module, the cathode of LED1 is connected to the anode of LED2, and the cathode of LED2 is grounded.

7. The leveling rod tilt alarm device as described in claim 1, characterized in that, Also includes: Isolation module, wireless communication module, control module, and display module; The isolation module and wireless communication module are mounted on the centering rod, and the control module and display module are mounted on the level. The input terminal of the isolation module is connected to the output terminal of the tilt detection module, the output terminal of the isolation module is connected to the input terminal of the wireless communication module, the output terminal of the wireless communication module is communicatively connected to the control module, and the control module is connected to the display module.

8. The leveling rod tilt alarm device as described in claim 7, characterized in that, The isolation module includes NOT gate U7 and NOT gate U8; The input terminal of NOT gate U7 is connected to the output terminal of the tilt detection module, the output terminal of NOT gate U7 is connected to the input terminal of NOT gate U8, and the output terminal of NOT gate U8 is connected to the wireless communication module.

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