Floor scrubber motor protection device
Patent Information
- Application Number
- CN202522230430.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-22
- Publication Date
- 2026-09-01
- Estimated Expiration
- 2035-10-22
AI Technical Summary
在此过程中，电池会处于过度放电状态，长期如此会导致电池内部电极结构受损、容量衰减，缩短电池使用寿命，增加用户的使用成本；同时，低电压状态下电机运行稳定性下降，可能出现转速波动、扭矩不足等问题，不仅影响洗地机的清洁效果，还可能进一步加剧电机的损耗，形成“低电压-电机受损-清洁效果差”的恶性循环；
本实用新型中，通过设置的洗地机电机保护装置，能够实现以下效果：1.针对背景技术中“现有洗地机电机仅靠继电器简单控制，异常电流导致电机、线路损坏甚至引发火灾”的问题，本装置通过设置监测控制模块与继电器配合工作，监测控制模块中的电流监测单元可实时采集吸尘电机和刷子电机的工作电流，当电流超过预设阈值（对应电机阻力增大、堵转等异常工况）时，第一控制单元能及时向继电器发送断开信号，控制继电器切断电机供电回路。该设计实现了对电机异常电流的主动监测与快速响应，可有效避免电机因过流烧毁、线路因过热破损，从根本上消除因电流异常引发火灾的安全隐患，保障洗地机设备安全与使用环境安全；2.针对背景技术中“洗地机供电电池低电压时无保护，导致电池过放损坏、电机运行不稳定”的问题，本装置的监测控制模块包含电压监测单元与第二控制单元，电压监测单元实时采集供电电池的电压数据，当电压低于预设阈值（即电池电量不足）时，第二控制单元一方面控制继电器断开，阻止洗地机继续运行以避免电池过放，保护电池内部电极结构，延长电池使用寿命，降低用户更换电池的成本；另一方面，语音提示模块在第二控制单元触发下发出提示语音，告知用户电池电压不足需及时充电，避免用户因不知情继续操作导致电池损坏，同时保障电机不会在低电压下运行，维持电机运行稳定性与洗地机清洁效果;3.针对背景技术中“传统保险丝保护为一次性设计，操作繁琐且保护功能单一”的问题，本装置设置了复位单元，当导致电机电流异常的故障（如杂物清理、通道疏通等）排除后，通过复位单元向第一控制单元发送复位信号，即可控制继电器重新闭合，使洗地机恢复正常工作，无需更换任何元件，操作便捷且无额外配件成本，实现了保护功能的自恢复；同时，本装置整合了电流监测保护、电压监测保护、语音提示等多重功能，不仅能应对电机过流、电池低电压两类核心故障，还能通过语音提示提升用户使用便捷性，相比传统单一保险丝保护，保护维度更全面，适配洗地机复杂工况的能力更强，显著提升了洗地机的整体可靠性与用户使用体验;4.本装置通过基板、顶板及支撑柱的配合结构，为继电器与监测控制模块提供了稳定的安装与保护载体，避免外界杂物、碰撞对内部核心元件造成损坏，保障保护装置自身的运行稳定性；同时，供电模块为继电器与监测控制模块提供独立且稳定的工作电源，确保各单元在洗地机整体供电波动时仍能正常采集数据、发送控制信号，进一步提升了保护功能的可靠性，避免因供电不稳定导致保护装置失效，间接保障了洗地机电机与电池的安全;5.本装置的整体结构设计简洁，各模块（如电流监测单元、电压监测单元、语音提示模块等）均集成于监测控制模块中，与继电器、供电模块等元件通过基板实现集中安装，无需对现有洗地机的主体结构进行大幅改造，适配性强，便于在各类手扶式洗地机上进行推广应用，降低了洗地机生产企业的改造与装配成本，具有较高的实用价值与市场应用前景。
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Figure CN224709356U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of floor scrubber accessories. Specifically, it relates to a floor scrubber motor protection device for monitoring the working status and fault protection of the dust suction motor and brush motor of a floor scrubber. It is applicable to various walk-behind floor scrubbers and can monitor the motor operating parameters in real time and automatically control the circuit to prevent damage to the motor and wiring due to abnormal working conditions, while also ensuring the service life of the floor scrubber's power supply battery. Background Technology
[0002] Currently, most walk-behind floor scrubbers on the market rely on relays (contactors) to control their vacuum and brush motors, enabling simple on / off operations. This only meets the basic function of starting and stopping the motor and lacks a monitoring mechanism for motor operation. When the floor scrubber operates in special environments (such as excessive debris causing brush jamming or blocked suction channels), the motor's operating resistance increases, potentially leading to motor stalling or jamming. In such cases, the current in the circuit will surge dramatically, and existing relay-based control schemes cannot respond to this abnormal current. This can easily lead to burnt-out motor windings, damaged circuit insulation, and in severe cases, overheating and fire, posing significant safety hazards and equipment damage risks. The power supply system of existing walk-behind floor scrubbers also lacks effective protection measures. When the battery power is insufficient, the battery voltage will continue to drop, but the scrubber will still continue to operate under user control. During this process, the battery will be in an over-discharge state. Over time, this will lead to damage to the internal electrode structure of the battery, capacity decay, shorten battery life, and increase user operating costs. At the same time, the motor's operating stability decreases under low voltage conditions, and problems such as speed fluctuations and insufficient torque may occur. This not only affects the cleaning effect of the floor scrubber but may also further aggravate motor wear, forming a vicious cycle of "low voltage - motor damage - poor cleaning effect." Traditional protection methods for floor scrubber motors sometimes rely on fuse blowing for overcurrent protection. However, fuses are one-time protective components; once they blow due to abnormal current, they must be manually replaced to restore operation, which is cumbersome and incurs additional replacement costs. Furthermore, fuses only passively respond to overcurrent faults and cannot proactively monitor motor operating conditions or protect against other faults affecting the scrubber's operation, such as low battery voltage. Their limited protection function fails to meet the comprehensive protection needs of floor scrubbers under complex operating conditions and is ill-suited to users' requirements for equipment stability and ease of use.
[0003] Therefore, it is necessary to design a motor protection device for the floor scrubber to solve the problems mentioned above. Utility Model Content
[0004] The purpose of this invention is to provide a motor protection device for floor scrubbers to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: The motor protection device for the floor scrubber is installed inside the main body of the floor scrubber. The core components include a base plate, relays, monitoring and control modules, a top plate, and terminals. These components work together to achieve the motor protection function.
[0006] Furthermore, the base plate serves as the mounting carrier for the device, on which relays for controlling the on / off state of the floor scrubber's vacuum motor and brush motor are fixedly mounted, along with a monitoring and control module electrically connected to the relays. The monitoring and control module can monitor the motor's operating status in real time and control the on / off state of the relays based on the monitoring results, thereby achieving active protection for the motor. A top plate is fixedly installed on the top of the base plate, directly above the monitoring and control module. The top plate is equipped with corresponding terminal blocks, which are used to realize the electrical connection between the protection device and external components such as the floor scrubber motor and power supply battery, ensuring stable signal and power transmission. At the same time, a support column is also fixedly installed on the top of the base plate. The top plate is placed on the support column and fixed with connecting nuts. The support column and the top plate work together to form a protective structure, which can prevent external debris and collisions from damaging the monitoring and control module and ensure the operational stability of the core components.
[0007] Furthermore, the monitoring and control module is the core of realizing the protection function. It integrates a current monitoring unit, a first control unit, a voltage monitoring unit, a second control unit, a voice prompt module, a reset unit, and a power supply module. Each unit has a clear division of labor and works in concert. The current monitoring unit includes current sensors connected in series between the vacuum cleaner motor and the power supply circuit, and between the brush motor and the power supply circuit. These sensors can collect current data of the vacuum cleaner motor and brush motor in real time and transmit the collected current data to the first control unit. The first control unit is electrically connected to the current monitoring unit and the relay. It is preset with a current threshold for normal motor operation. When the current data received by the first control unit exceeds the preset current threshold (i.e., the motor experiences abnormal conditions such as increased resistance or stall), the first control unit immediately sends a disconnect signal to the relay to disconnect the relay and cut off the motor power supply circuit, thus preventing the motor from burning out due to overcurrent and the wiring from being damaged due to overheating. The voltage monitoring unit is electrically connected to the power supply battery of the floor scrubber, and can collect the voltage data of the power supply battery in real time and transmit the voltage data to the second control unit. The second control unit is electrically connected to the voltage monitoring unit and the relay respectively. It is preset with a voltage threshold for normal battery power supply. When the voltage data received by the second control unit is lower than the preset voltage threshold (i.e., the battery power is insufficient), the second control unit sends a disconnect signal to the relay to control the relay to disconnect and prevent the floor scrubber from continuing to operate, so as to avoid the battery being damaged due to over-discharge. At the same time, it ensures that the motor does not operate under low voltage, maintaining the stability of motor operation and the cleaning effect of the floor scrubber. The voice prompt module is electrically connected to the second control unit, and the voice prompt module further includes a voice chip and a speaker. The voice chip is electrically connected to the second control unit, and the speaker is electrically connected to the voice chip. When the voltage data collected by the voltage monitoring unit is lower than the preset voltage threshold, the second control unit sends a disconnect signal to the relay and a trigger signal to the voice chip at the same time. After receiving the trigger signal, the voice chip drives the speaker to emit a prompt voice (such as "Battery voltage is low, please charge in time"), intuitively informing the user of the cause of the fault, making it convenient for the user to charge the battery in time and improving the ease of use. The reset unit is electrically connected to the first control unit. When a fault that caused the motor current to exceed the preset threshold (such as cleaning debris on the ground or unblocking the vacuuming passage) is resolved, the user can operate the reset unit (such as pressing the reset button) to send a reset signal to the first control unit. After receiving the reset signal, the first control unit determines that the motor's current operating condition has returned to normal, and then controls the relay to close again to restore the power supply to the motor, so that the floor scrubber can work normally. No components need to be replaced, realizing the self-recovery of the protection function. It is easy to operate and has no additional parts cost. The power supply module is electrically connected to the relay and the monitoring and control module, respectively. It can provide a stable working power to each sub-unit of the relay and the monitoring and control module (current monitoring unit, first control unit, voltage monitoring unit, second control unit, voice prompt module, and reset unit), ensuring that each unit can still collect data and send control signals normally when the overall power supply of the floor scrubber fluctuates. This avoids the failure of the protection device due to unstable power supply and indirectly protects the safety of the floor scrubber motor and battery.
[0008] Compared with the prior art, the beneficial effects of this utility model are: In this utility model, the following effects can be achieved by setting a motor protection device for the floor scrubber: 1. In view of the problem in the background technology that "existing floor scrubber motors are simply controlled by relays, and abnormal currents can cause damage to the motor and wiring or even cause fires", this device sets a monitoring and control module to work in conjunction with the relay. The current monitoring unit in the monitoring and control module can collect the working current of the vacuum motor and the brush motor in real time. When the current exceeds the preset threshold (corresponding to abnormal working conditions such as increased motor resistance and stall), the first control unit can send a disconnect signal to the relay in time to control the relay to cut off the power supply circuit of the motor.This design enables proactive monitoring and rapid response to abnormal motor current, effectively preventing motor burnout due to overcurrent and wiring damage due to overheating. It fundamentally eliminates the safety hazard of fires caused by abnormal current, ensuring the safety of the floor scrubber and the operating environment. 2. Addressing the issue in the background technology of "no protection when the floor scrubber's power battery is low, leading to battery over-discharge damage and unstable motor operation," this device's monitoring and control module includes a voltage monitoring unit and a second control unit. The voltage monitoring unit collects the battery voltage data in real time. When the voltage falls below a preset threshold (i.e., insufficient battery power), the second control unit controls a relay to disconnect, preventing the floor scrubber from continuing to operate and avoiding battery over-discharge, protecting the battery's internal electrode structure, and extending battery life. This reduces the cost of battery replacement for users. On the other hand, the voice prompt module, triggered by the second control unit, issues a prompt to inform the user that the battery voltage is low and needs to be charged promptly, preventing battery damage due to user unawareness and ensuring the motor does not operate under low voltage, maintaining motor stability and the cleaning effect of the floor scrubber. 3. Addressing the issue in the background technology that "traditional fuse protection is a one-time design, cumbersome to operate, and has limited protection function," this device is equipped with a reset unit. When a fault causing abnormal motor current (such as debris removal or channel unblocking) is resolved, a reset signal is sent to the first control unit through the reset unit, which controls the relay to close again, allowing the floor scrubber to return to normal operation without replacing any components. This is convenient and requires no additional cost. The component cost is reduced, and the self-recovery function of the protection function is achieved. Simultaneously, this device integrates multiple functions such as current monitoring protection, voltage monitoring protection, and voice prompts. It not only handles two core faults—motor overcurrent and battery low voltage—but also enhances user convenience through voice prompts. Compared to traditional single fuse protection, it offers more comprehensive protection dimensions and stronger adaptability to complex operating conditions of floor scrubbers, significantly improving the overall reliability of the floor scrubber and the user experience. 4. The device's structure, consisting of a base plate, top plate, and support columns, provides a stable installation and protection platform for the relays and monitoring control modules, preventing damage to internal core components from external debris and collisions, ensuring the operational stability of the protection device itself. At the same time, the power supply module provides power to the relays and monitoring control modules. It provides an independent and stable power supply, ensuring that each unit can still collect data and send control signals normally when the overall power supply of the floor scrubber fluctuates, further improving the reliability of the protection function and avoiding the failure of the protection device due to unstable power supply, thus indirectly protecting the safety of the floor scrubber motor and battery; 5. The overall structure of this device is simple, and all modules (such as the current monitoring unit, voltage monitoring unit, voice prompt module, etc.) are integrated into the monitoring and control module. It is centrally installed with relays, power supply modules and other components through a base plate, without the need for major modifications to the main structure of the existing floor scrubber. It has strong adaptability and is easy to promote and apply to various walk-behind floor scrubbers, reducing the modification and assembly costs for floor scrubber manufacturers. It has high practical value and market application prospects. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model; Figure 2 This utility model Figure 1 Top view of the structure; Figure 3 This utility model Figure 1 A three-dimensional structural diagram of the top plate after disassembly. Figure 4 This utility model Figure 3 A top-view structural diagram; Figure 5 This is a side view of the structure of this utility model; Figure 6 This is a side view structural schematic diagram of the present invention from another perspective.
[0010] In the diagram: 1. Base plate; 2. Relay; 3. Monitoring and control module; 4. Top plate; 5. Terminal block; 6. Support column; 7. Connecting nut; 31. Current monitoring unit; 32. First control unit; 33. Voltage monitoring unit; 34. Second control unit; 35. Voice prompt module; 36. Reset unit; 37. Power supply module. Detailed Implementation
[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.
[0012] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are provided. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete. Example
[0013] Please see Figure 1 This embodiment provides a motor protection device for floor scrubbers, which is suitable for walk-behind floor scrubbers and is used to provide comprehensive protection for the vacuum motor and brush motor of the floor scrubber. The motor protection device for the floor scrubber is installed in the reserved installation space inside the main body of the floor scrubber. The core structure includes a base plate 1, a relay 2, a monitoring and control module 3, a top plate 4, a terminal block 5, a support column 6, and a connecting nut 7. Example
[0014] Please see Figure 1 , Figure 2 as well as Figure 3 Based on Embodiment 1, this embodiment further specifies that the substrate 1 is made of insulating and flame-retardant material, serving as the mounting carrier for the entire protection device. Its size is adapted to the installation space inside the main body of the floor scrubber. A relay 2 and a monitoring and control module 3 are fixedly mounted on the substrate 1 by bolts. The relay 2 is a DC electromagnetic relay, and its model matches the rated operating current of the floor scrubber's vacuum motor and brush motor. It is used to control the on / off of the power supply circuit of the vacuum motor and brush motor. The monitoring and control module 3 is electrically connected to the relay 2 through wires and can collect the motor operating parameters in real time and send on / off control signals to the relay 2. Four support columns 6 are welded and fixed at the four corners of the top of the base plate 1. The support columns 6 are made of metal and are slightly higher than the height of the monitoring and control module 3. The top plate 4 is placed on top of the four support columns 6. The contact position between the top plate 4 and the support columns 6 is provided with mounting holes that are adapted to the support columns 6. The connecting nut 7 passes through the mounting hole and engages with the external thread at the top of the support column 6 to achieve a fixed connection between the top plate 4 and the support columns 6. The top plate 4 covers the top of the monitoring and control module 3, which can prevent dust, water stains or debris generated during the operation of the floor scrubber from contacting the monitoring and control module 3, thus providing physical protection for the monitoring and control module 3. At the same time, the top plate 4 is fixedly provided with terminal posts 5 corresponding to the wiring positions of the floor scrubber's vacuum motor, brush motor and power supply battery. The terminal posts 5 are made of copper conductive material and are connected to the relay 2, the monitoring and control module 3 and the motor and battery outside the floor scrubber through wires to ensure stable transmission of power and signals. Example
[0015] Please see Figure 3 as well as Figure 4 Based on embodiment 1, this embodiment further defines the monitoring and control module 3 as an integrated circuit module, which integrates a current monitoring unit 31, a first control unit 32, a voltage monitoring unit 33, a second control unit 34, a voice prompt module 35, a reset unit 36, and a power supply module 37. The current monitoring unit 31 includes two Hall current sensors, which are connected in series between the vacuum cleaner motor and the power supply circuit, and between the brush motor and the power supply circuit, respectively. The signal output terminal of the Hall current sensor is electrically connected to the signal input terminal of the first control unit 32 through a wire. The current monitoring unit 31 is set to a sampling frequency of 10Hz, which can collect the loop current data of the vacuum cleaner motor and the brush motor in real time, and convert the collected current analog signal into a digital signal and transmit it to the first control unit 32. The first control unit 32 uses a microcontroller as its core control chip. The chip has pre-stored the normal operating current threshold for the vacuum cleaner motor and the brush motor (this threshold is set according to the rated current of the motor, usually 1.2-1.5 times the rated current). When the first control unit 32 receives the current data transmitted by the current monitoring unit 31, it will compare it with the preset current threshold in real time. If the current data does not exceed the preset threshold, the first control unit 32 will not send a control signal to the relay 2, the relay 2 will remain closed, and the motor will work normally. If the current data exceeds the preset threshold (such as the floor scrubber brush getting stuck due to contact with debris on the ground, the vacuuming channel being blocked, causing increased motor resistance, or the motor stalling or jamming), the first control unit 32 will immediately send a high-level disconnect signal to the coil terminal of the relay 2. The moving contact of the relay 2 will separate from the stationary contact, cutting off the power supply circuit of the vacuum cleaner motor and the brush motor, preventing the motor windings from burning out due to overcurrent, and preventing the circuit from overheating due to excessive current, thus eliminating the fire hazard. The voltage monitoring unit 33 uses a voltage sensor. Its input terminal is connected to the positive terminal of the power supply battery of the floor scrubber through a wire, and its output terminal is electrically connected to the signal input terminal of the second control unit 34 through a wire. The voltage monitoring unit 33 has an acquisition accuracy of ±0.05V and can acquire the terminal voltage data of the power supply battery in real time, and convert the voltage data into a digital signal and transmit it to the second control unit 34. The second control unit 34 also uses a microcontroller (which can share the same chip as the first control unit 32, but can be distinguished by different pins). It internally stores the minimum operating voltage threshold of the power supply battery (this threshold is set according to the battery type; for example, the minimum operating voltage threshold for lead-acid batteries is 0.8 times the rated voltage, and for lithium batteries it is 0.7 times the rated voltage). When the second control unit 34 receives voltage data transmitted from the voltage monitoring unit 33, it compares it with the preset voltage threshold. If the voltage data is higher than the preset threshold, the second control unit 34 does not interfere with the operation of the relay 2. If the voltage data is lower than the preset threshold (i.e., the battery power is insufficient), the second control unit 34 sends a disconnect signal to the coil of the relay 2, controlling the relay 2 to disconnect, cutting off the motor power supply circuit, preventing internal electrode polarization and capacity decay due to over-discharge, and extending battery life. Simultaneously, cutting off the power supply in a low-voltage state avoids problems such as reduced motor speed and insufficient torque due to insufficient voltage, ensuring the stability of the cleaning effect before the floor scrubber stops. The voice prompt module 35 includes a voice chip and a miniature speaker. The signal input terminal of the voice chip is electrically connected to the signal output terminal of the second control unit 34 via a wire, and the miniature speaker is electrically connected to the audio output terminal of the voice chip via a wire. The voice chip has pre-stored the voice data "Battery voltage is low, please charge in time" inside. The rated power of the miniature speaker is adapted to the acoustic environment inside the floor scrubber to ensure that the user can clearly hear the prompt sound when the floor scrubber is working. When the voltage data collected by the voltage monitoring unit 33 is lower than the preset threshold, the second control unit 34 sends a disconnect signal to the relay 2 and a trigger signal to the voice chip at the same time. After receiving the trigger signal, the voice chip calls the voice data stored in its internal storage and transmits the voice electrical signal to the miniature speaker. The miniature speaker converts the electrical signal into a sound signal and issues a prompt voice saying "Battery voltage is low, please charge in time". This intuitively informs the user of the reason for the shutdown and prevents the user from repeatedly trying to start the floor scrubber due to ignorance, thus further protecting the battery. The reset unit 36 includes a reset button and a reset circuit. The reset button is installed on the outside of the top plate 4 for easy user operation. The input terminal of the reset circuit is electrically connected to the reset button, and the output terminal is electrically connected to the reset signal input terminal of the first control unit 32. When the current monitoring unit 31 detects that the current exceeds the threshold and the first control unit 32 controls the relay 2 to disconnect, the user can first troubleshoot the floor scrubber (such as cleaning debris from the brushes, unblocking the vacuuming passage, etc.). After the fault is cleared, the user presses the reset button, and the reset circuit sends a low-level reset signal to the first control unit 32. After receiving the reset signal, the first control unit 32 clears the previous overcurrent fault record and rereads the real-time current data of the current monitoring unit 31. If the current data recovers to below the preset threshold at this time, the first control unit 32 sends a closing signal to the relay 2 to control the relay 2 to close again, and the motor resumes normal operation without the need to replace any parts, thus achieving self-recovery of the protection function. The power supply module 37 includes a voltage regulator circuit and a filter circuit. Its input terminal is electrically connected to the power supply battery of the floor scrubber via a wire, and its output terminal is electrically connected to the coil terminal of the relay 2, the current monitoring unit 31, the first control unit 32, the voltage monitoring unit 33, the second control unit 34, the voice prompt module 35, and the reset unit 36 via wires. The power supply module 37 can convert the unstable voltage of the power supply battery (such as the voltage fluctuation from the rated value to the minimum threshold during battery discharge) into a stable DC voltage (such as 5V or 12V, adapted to the working voltage requirements of each unit), and at the same time filter out the ripple interference in the voltage through the filter circuit. Even if the voltage of the floor scrubber's power supply battery fluctuates, the power supply module 37 can still provide a stable power supply to each unit of the monitoring and control module 3 and the relay 2, ensuring the monitoring accuracy of each unit and the reliability of the control signal, and avoiding the failure of the protection device due to unstable power supply.
[0016] The working process of this utility model: This floor scrubber motor protection device implements motor protection based on the logic of "real-time monitoring - abnormal response - fault indication - reset and recovery". Combined with the synergistic effect of the core components of the device (board 1, relay 2, monitoring and control module 3, top plate 4, terminal block 5, support column 6, and connecting nut 7), the specific workflow is as follows: I. Device Initialization and Routine Workflow Power supply start-up: After the floor scrubber is powered on, the power supply module 37 is connected to the floor scrubber's power supply battery through the terminal 5. After stabilizing and filtering the battery voltage, it provides a stable working power supply to the relay 2 and the various sub-units of the monitoring and control module 3, and the device enters the initialization state.
[0017] Parameter preset and monitoring start-up: The first control unit 32 automatically loads the normal operating current threshold of the vacuum motor and brush motor (adapted to the rated current of the motor), and the second control unit 34 automatically loads the minimum operating voltage threshold of the power supply battery (adapted to the battery type); at the same time, the current monitoring unit 31 starts current acquisition, and collects the operating current data of the two motors in real time at a preset frequency (such as 10Hz) through the sensors connected in series in the power supply circuit of the vacuum motor and brush motor. The voltage monitoring unit 33 starts voltage acquisition, and collects the terminal voltage data of the power supply battery in real time.
[0018] Normal control logic: The current monitoring unit 31 transmits the collected current data to the first control unit 32 in real time, and the voltage monitoring unit 33 transmits the collected voltage data to the second control unit 34 in real time; if the current data is lower than the preset current threshold and the voltage data is higher than the preset voltage threshold, neither the first control unit 32 nor the second control unit 34 sends a control signal to the relay 2. The relay 2 remains closed, and the vacuum motor and brush motor obtain power through the relay 2 and operate normally, and the floor scrubber performs cleaning operations.
[0019] II. Motor Overcurrent Fault Protection Procedure (Corresponding to Abnormal Current Scenarios) Abnormal monitoring and signal triggering: When the floor scrubber encounters debris on the ground that jams the brush or the suction channel is blocked, causing the motor resistance to increase, the motor to stall or get stuck, the motor operating current will rise instantly. After the current monitoring unit 31 collects the abnormal current data, it immediately transmits the data to the first control unit 32. The first control unit 32 compares the abnormal current data with the preset current threshold. If it confirms that the threshold is exceeded, it generates a "disconnect control signal".
[0020] Circuit cut-off protection: The first control unit 32 transmits the "disconnect control signal" to the coil terminal of the relay 2. After receiving the signal, the internal moving contact of the relay 2 separates from the stationary contact, cutting off the power supply circuit of the vacuum cleaner motor and the brush motor, preventing the motor from burning out the winding due to continuous overcurrent, and preventing the circuit from overheating due to excessive current, thus eliminating fire hazards.
[0021] Troubleshooting and Reset: After the user discovers that the floor scrubber has stopped, they should troubleshoot and resolve the fault (such as cleaning debris from the brushes and unblocking the suction channel). After troubleshooting, the user should operate the reset unit 36 installed on the outside of the top plate 4 (such as pressing the reset button). The reset unit 36 sends a "reset signal" to the first control unit 32. After receiving the reset signal, the first control unit 32 clears the overcurrent fault record, rereads the real-time current data of the current monitoring unit 31, and after confirming that the current has returned to below the normal threshold, sends a "closing control signal" to the relay 2. The relay 2 closes again, the motor is powered back, and the floor scrubber can be restarted.
[0022] III. Battery Low Voltage Protection Procedure (for abnormal voltage scenarios) Voltage monitoring and signal triggering: As the floor scrubber continues to work, the power supply battery gradually consumes power and the voltage gradually decreases; the voltage monitoring unit 33 collects battery voltage data in real time. When the voltage data is lower than the minimum voltage threshold preset by the second control unit 34, the voltage monitoring unit 33 transmits the low voltage data to the second control unit 34. After the second control unit 34 confirms the data abnormality, it simultaneously generates a "disconnect control signal" and a "voice trigger signal".
[0023] Circuit cut-off and voice prompts: On the one hand, the second control unit 34 transmits a "disconnect control signal" to the relay 2, which disconnects the motor power supply circuit to prevent the battery from being damaged by excessive discharge, thus reducing its capacity and extending its lifespan. On the other hand, the second control unit 34 transmits a "voice trigger signal" to the voice prompt module 35. The voice chip inside the voice prompt module 35 calls preset voice data (such as "Battery voltage is low, please charge in time") and drives the speaker to emit a prompt voice, intuitively informing the user of the reason for the shutdown and avoiding repeated starting of the floor scrubber, which would aggravate battery wear.
[0024] Power supply restoration: After hearing the voice prompt, the user stops using the floor scrubber and charges the power supply battery; after the battery voltage returns to the normal operating range, the floor scrubber is restarted. The voltage monitoring unit 33 collects normal voltage data, the second control unit 34 no longer sends the "disconnect control signal", and the relay 2 can be closed again under the floor scrubber start command, and the motor resumes normal power supply.
[0025] IV. Equipment Protection and Auxiliary Procedures In all the above-mentioned workflows, the base plate 1 serves as the mounting carrier, and the top plate 4 is fixed by the support column 6 and the connecting nut 7. The top plate 4 covers the monitoring and control module 3 directly above it, which can prevent dust, water stains and debris generated during the operation of the floor scrubber from contacting the monitoring and control module 3, thus providing physical protection for the core circuit components. At the same time, the terminal block 5 ensures the stable wiring of the relay 2, the monitoring and control module 3 and the external motor and battery, ensuring the reliability of current and voltage signal transmission, and providing structural and connection support for the smooth execution of the entire protection process.
[0026] 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 motor protection device for a scrubber, which is installed in the interior of a main body of the scrubber and is used to protect a motor of the scrubber, characterized in that: The system includes a base plate (1), a relay (2) located on the base plate (1) for controlling the on / off state of the vacuum cleaner motor and the brush motor of the floor scrubber, and a monitoring and control module (3) electrically connected to the relay (2). The monitoring and control module (3) is used to monitor the working state of the motor and control the on / off state of the relay (2). A top plate (4) is fixedly installed on the top of the base plate (1) directly above the monitoring and control module (3). A terminal block (5) is correspondingly provided on the top plate (4). The monitoring and control module (3) includes a current monitoring unit (31), a first control unit (32), a voltage monitoring unit (33), a second control unit (34), a voice prompt module (35), a reset unit (36), and a power supply module (37).
2. The walk behind machine motor protection device of claim 1, wherein: The current monitoring unit (31) includes a current sensor connected in series between the vacuum cleaner motor and the power supply circuit, and between the brush motor and the power supply circuit, for real-time acquisition of current data when the vacuum cleaner motor and the brush motor are working.
3. The walk behind machine motor protection device of claim 1, wherein: The first control unit (32) is electrically connected to the current monitoring unit (31) and the relay (2) respectively. When the current data collected by the current monitoring unit (31) exceeds the preset current threshold, the first control unit (32) sends a disconnect signal to the relay (2) to control the relay (2) to disconnect.
4. The walk behind machine motor protection device of claim 1, wherein: The voltage monitoring unit (33) is electrically connected to the power supply battery of the floor scrubber and is used to collect the voltage data of the power supply battery in real time.
5. The walk behind machine motor protection device of claim 1, wherein: The second control unit (34) is electrically connected to the voltage monitoring unit (33) and the relay (2) respectively. When the voltage data collected by the voltage monitoring unit (33) is lower than the preset voltage threshold, the second control unit (34) sends a disconnect signal to the relay (2) to control the relay (2) to disconnect.
6. The walk behind machine motor protection device of claim 1, wherein: The voice prompt module (35) is electrically connected to the second control unit (34). When the voltage data collected by the voltage monitoring unit (33) is lower than the preset voltage threshold, the second control unit (34) sends a trigger signal to the voice prompt module (35), and the voice prompt module (35) issues a prompt voice. The voice prompt module (35) includes a voice chip and a speaker. The voice chip is electrically connected to the second control unit (34), and the speaker is electrically connected to the voice chip. The trigger signal sent by the second control unit (34) is transmitted to the voice chip, and the voice chip drives the speaker to emit a prompt voice.
7. The floor scrubber motor protection device according to claim 1, characterized in that: The reset unit (36) is electrically connected to the first control unit (32). When the fault that caused the motor current to exceed the preset current threshold is cleared, the reset unit (36) sends a reset signal to the first control unit (32), and the first control unit (32) controls the relay (2) to close again.
8. The walk behind machine motor protection device of claim 1, wherein: The power supply module (37) is electrically connected to the relay (2) and the monitoring and control module (3) respectively, and is used to provide working power to the relay (2) and the monitoring and control module (3).
9. The walk behind machine motor protection device of claim 1, wherein: The top of the base plate (1) is fixedly provided with a supporting column (6), the top plate (4) is arranged on the supporting column (6) and is fixedly connected by a connecting nut (7), so as to protect the monitoring control module (3).