A hoisting control protection circuit

Abstract

This utility model relates to the field of hoisting equipment control technology and discloses a hoisting control and protection circuit, including a DC / DC voltage source, the output terminal of which is connected to the MCU power supply pin to ensure the power supply of the MCU; an output relay, the output terminal of which is connected to the output relay to ensure the power supply of the relay, the output terminal of which is connected to an external contactor, and the output control terminal of which quickly closes or opens the coil circuit of the external motor main contactor; and a detection switch signal, which is connected to the AD port of the MCU to detect the external hoisting switch signal. During operation, the MCU continuously collects the signal from the switch signal detection terminal to monitor the operation status in real time, ensuring smooth execution of the hoisting action. This allows for accurate detection of signals during hoisting control, rapid cut-off protection for abnormal operating conditions, and continuous circuit status monitoring.

Description

Technical Field

[0001] This utility model relates to the field of hoisting equipment control technology, specifically a hoisting control and protection circuit. Background Technology

[0002] In hoisting operations involving lifting machinery and equipment, the stability and reliability of the hoisting control circuit directly impact equipment safety, personnel safety, and operational efficiency. Traditional hoisting control circuits often rely on simple relay logic or basic control modules, resulting in inaccurate signal monitoring and delayed responses to abnormal conditions. For example, when control signals become disordered or hoisting logic malfunctions, it is difficult to promptly disconnect dangerous circuits, potentially leading to equipment failures, cargo falls, and other safety accidents. Furthermore, the lack of effective circuit monitoring results in reactive maintenance, affecting the continuous operating efficiency and lifespan of the hoisting equipment. Therefore, there is an urgent need for a hoisting control protection circuit with accurate signal detection and rapid safety response. Utility Model Content

[0003] The purpose of this invention is to provide a hoisting control protection circuit that can accurately detect signals during the hoisting control process, quickly cut off protection in abnormal operating conditions, and also has the ability to continuously monitor the circuit status.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a lifting control protection circuit, including a DC / DC voltage source, wherein the output terminal of the DC / DC is connected to the MCU power supply pin to ensure the power supply of the MCU;

[0005] An output relay is provided, with the output terminal of the DC / DC converter connected to the output relay to ensure power supply to the relay. The output terminal of the output relay is connected to an external contactor, and the output control terminal of the output relay quickly closes or opens the coil circuit of the external motor main contactor.

[0006] A detection switch signal is connected to the AD port of the MCU and is used to detect an external lifting switch signal.

[0007] Preferably, the system further includes a power supply module, a signal detection module, a control module, and a protection execution module. The power supply module and the signal detection module are electrically connected, the signal detection module and the control module are electrically connected, and the control module and the protection execution module are electrically connected.

[0008] Preferably, the power module is provided with a positive power terminal and a negative power terminal, and the positive power terminal is connected to a DC / DC conversion unit.

[0009] Preferably, the signal detection module is provided with a switch signal detection terminal.

[0010] Preferably, the control module includes a MCU, and the circuit in the control module is provided with an input control terminal and an output control terminal, both of which are used in conjunction with the MCU.

[0011] Preferably, the DC / DC conversion unit outputs a stable voltage of +5V to power the MCU and the output relay.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This invention utilizes an MCU to control logic and output control signals, thereby driving a relay to engage and connect the input and output control terminals. The input and output control terminals are then connected to the main contactor coil circuit of the hoisting motor, enabling the hoisting equipment to execute hoisting actions according to instructions. During operation, the MCU continuously collects signals from the switch signal detection terminal to monitor the operational status in real time, ensuring smooth execution of the hoisting action. This allows for accurate signal detection during hoisting control, rapid cut-off protection in abnormal conditions, and continuous circuit status monitoring. Attached Figure Description

[0014] Figure 1 This is the electrical diagram of the hoisting protection control module in this utility model;

[0015] Figure 2 This is a circuit diagram of the hoisting protection control module in this utility model;

[0016] Figure 3 This is a circuit diagram of the MCU and relay in this utility model;

[0017] Figure 4 This is the MCU circuit diagram of this utility model;

[0018] Figure 5 This is a circuit diagram of the connection point to the MCU port in this utility model. Detailed Implementation

[0019] 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.

[0020] Please see Figure 1-5As shown, a hoisting control and protection circuit includes a DC / DC voltage source. The output terminal of the DC / DC source is connected to the MCU power supply pin. The positive terminal of the power supply (red RD) is connected to the input terminal of the DC / DC converter unit, and the output terminal of the DC / DC source is connected to the MCU power supply pin to ensure the power supply to the MCU. An output relay is connected to the output terminal of the DC / DC source to ensure the power supply to the relay. The output terminal of the output relay is connected to an external contactor. The output control terminal of the output relay quickly closes or opens the coil circuit of the external motor main contactor. The input control terminal (green GN) and the output control terminal (blue BU) are respectively connected to the hoisting control main relay coil circuit. The negative terminal of the power supply (black BK) is reliably connected to the negative pin of each module and the equipment grounding terminal, completing the physical circuit construction. A detection switch signal is connected to the AD port of the MCU to detect the external hoisting switch signal. After the equipment is powered on, the DC / DC converter unit outputs a stable voltage of +5V to power the MCU and the output relay. The MCU starts and executes the initialization program, loading the preset signal filtering algorithm and control logic, and entering the signal monitoring and control standby state.

[0021] The hoisting protection control module circuit provided by this utility model has a built-in DC-DC power supply circuit and an ultra-wide voltage input: the input voltage range is 6V-100V to adapt to vehicles with different voltage platforms. The MCU detects the hoisting switch signal through a preset program and judges the working condition and hoisting operation logic. After detecting normal or abnormal, it drives the relay to close or open to control the main contactor coil circuit of the hoisting motor, thereby protecting the safety of goods and personnel.

[0022] It also includes a power supply module, a signal detection module, a control module, and a protection execution module. The power supply module and the signal detection module are electrically connected, the signal detection module and the control module are electrically connected, and the control module and the protection execution module are electrically connected.

[0023] Power module: Equipped with a positive power terminal (red RD) and a negative power terminal (black BK), providing power input to the circuit. The positive power terminal is connected to the DC / DC conversion unit, and after conversion, it supplies power to the MCU (Microcontroller Unit) and subsequent control circuits, ensuring stable power supply to all modules.

[0024] Signal detection module: Set up a switch signal detection terminal (yellow YL) to collect the switch control signals of the hoisting equipment, monitor the start and stop of the hoisting operation in real time, and transmit the analog signal to the MCU as the input basis for control logic judgment.

[0025] Control Module: Includes an MCU, which receives signals from the switch signal detection terminal, processes them through an internal preset program, and outputs control commands. The circuit has an input control terminal (normally open, green GN) and an output control terminal (normally open, blue BU). The MCU controls the on / off state of the input and output control terminals based on the processed signals. When an abnormal signal is detected or a dangerous condition is determined, the MCU quickly cuts off the control input and output terminals, blocking the dangerous lifting operation; if it is a normal operating signal, the conduction circuit is maintained to ensure the execution of the lifting operation.

[0026] Protection Execution Module: Utilizing the normally open characteristics of the input and output control terminals, and in conjunction with MCU instructions, it achieves circuit on / off control. During normal operation, the control terminals remain conductive under MCU control; in case of an abnormality, they are quickly disconnected, cutting off the input and output control terminals. This disconnects the main contactor coil circuit of the hoisting motor, preventing dangerous actions from continuing and protecting the safety of equipment, goods, and personnel.

[0027] Working principle: Connect the positive terminal of the power supply (red RD) to the input terminal of the DC / DC converter unit, and connect the DC / DC output terminal to the MCU power supply pin to ensure MCU power supply; connect the switch signal detection terminal (yellow YL) to the hoisting button of the hoisting equipment to ensure the signal acquisition link is unobstructed; connect the input control terminal (green GN) and output control terminal (blue BU) to the hoisting control main relay coil circuit respectively, and reliably connect the negative terminal of the power supply (black BK) to the negative pin of each module and the equipment ground terminal to complete the physical circuit construction. After the equipment is powered on, the DC / DC converter unit outputs a stable voltage of +5V to power the MCU and output relay. The MCU starts and executes the initialization program. It loads the preset signal filtering algorithm and control logic, and enters the signal monitoring and control standby state.

[0028] When the operator presses the hoisting button, the switch signal detection terminal (yellow YL) collects the corresponding control signal level signal and transmits it to the MCU. The MCU first filters the signal and then compares it with the preset control logic. After verifying that there are no abnormalities, it determines that it is a "normal hoisting command". After a 50ms delay, the control terminal is activated: the MCU outputs a control signal according to the control logic, thereby driving the relay to activate the input control terminal (green GN, normally open) and the output control terminal (blue BU, normally open). The input control terminal and the output control terminal connect the main contactor coil circuit of the hoisting motor, and the hoisting equipment executes the hoisting action according to the command. During the operation, the MCU continuously collects the signal from the switch signal detection terminal to monitor the operation status in real time and ensure the smooth execution of the hoisting action.

[0029] If any abnormalities occur during the hoisting operation, such as:

[0030] A. Control command conflict: Frequent triggering of lifting / lowering commands within a short period of time, resulting in signal timing disorder. After signal processing and comparison, the MCU determines it to be an "abnormal operating condition".

[0031] B. Control Logic Error: The control signal exists after power-on, indicating a control logic error and classifying it as an "abnormal operating condition." (This could be due to a malfunctioning hoisting button or operator error, such as the hoisting button being pressed before power-on. Immediately executing the hoisting action in this situation could cause significant damage.)

[0032] Rapid protection action: The MCU immediately triggers the protection program, outputs a cut-off command, and quickly disconnects the control input and output terminals, cutting off the power supply to the main contactor coil of the hoisting motor, causing the motor to stop. After the protection action is triggered, and the fault is cleared and the signal returns to normal, the hoisting operation can be restarted after manual power-on and automatic re-detection according to the preset program settings.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hoisting control protection circuit comprising a DC / DC voltage source, characterized by: The output terminal of the DC / DC converter is connected to the MCU power supply pin to ensure the power supply of the MCU. An output relay is provided, with the output terminal of the DC / DC converter connected to the output relay to ensure power supply to the relay. The output terminal of the output relay is connected to an external contactor, and the output control terminal of the output relay quickly closes or opens the coil circuit of the external motor main contactor. A detection switch signal is connected to the AD port of the MCU and is used to detect an external lifting switch signal.

2. A hoisting control protection circuit according to claim 1, characterized in that It also includes a power supply module, a signal detection module, a control module, and a protection execution module. The power supply module and the signal detection module are electrically connected, the signal detection module and the control module are electrically connected, and the control module and the protection execution module are electrically connected.

3. The hoisting control and protection circuit according to claim 2, characterized in that: The power module is provided with a positive power terminal and a negative power terminal, and the positive power terminal is connected to the DC / DC conversion unit.

4. The hoisting control and protection circuit according to claim 2, characterized in that: The signal detection module is equipped with a switch signal detection terminal.

5. A hoisting control and protection circuit according to claim 2, characterized in that: The control module includes a MCU, and the circuit in the control module is provided with an input control terminal and an output control terminal. Both the output and input control terminals are used in conjunction with the MCU.

6. The hoisting control and protection circuit according to claim 3, characterized in that: The DC / DC conversion unit outputs a stable voltage of +5V to power the MCU and output relay.

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