A scissors-type aerial work platform with anti-tilting self-locking outriggers and a working method thereof

Abstract

The application provides a scissor-type aerial work platform with anti-overturning self-locking outriggers and a working method thereof. The aerial work platform comprises a scissor-type aerial work platform body, an outrigger assembly, a telescopic driving mechanism, a self-locking control module and an audible and visual alarm. The outrigger assembly is provided with multiple groups and is uniformly arranged at the base of the scissor-type aerial work platform body. The telescopic driving mechanism drives the telescopic movement of the outrigger oil cylinder. The self-locking control module comprises a sensing unit, a control unit and an execution unit. In the application, the dependence on the experience of operators is greatly reduced through the automatic safety closed loop of continuous monitoring, algorithm judgment, audible and visual early warning and active locking. The after-repair is changed into pre-prevention and in-process interruption through high-tech means, the safety performance of the scissor-type aerial work platform is essentially improved, the hydraulic locking valve of the execution unit replaces manual operation for instantaneous operation, the problem of human reaction delay is eliminated, and the timeliness and reliability of the intervention of the platform overturning are greatly improved.

Description

Technical Field

[0001] This invention belongs to the technical field of scissor lift aerial work platforms, and particularly relates to a scissor lift aerial work platform with anti-tipping self-locking outriggers and its working method. Background Technology

[0002] A scissor lift is a specialized piece of equipment that uses a hydraulic or electric system to vertically raise and lower a manned platform with a work platform along an "X"-shaped folding scissor boom for high-altitude work. It is a type of mobile lifting work platform.

[0003] Scissor lifts are indispensable aerial work platforms in modern engineering construction, equipment installation, and warehousing and logistics. They achieve vertical lifting of the work platform by extending the scissor arms. To ensure stability during operation, the platform chassis is usually equipped with multiple retractable outriggers that extend and support the ground before operation to increase the support span, lower the center of gravity, and prevent tipping.

[0004] Currently, most scissor lift platforms have outrigger systems that are manually operated or simply hydraulically driven. Their function is limited to providing static support, and operational safety relies heavily on the operator's experience when operating the outriggers: a firm, flat surface must be selected, and all outrigger plates must be in full contact with the ground and the force must be evenly distributed. However, actual working conditions are complex and variable, and there may be sudden situations such as ground subsidence (e.g., soft soil, underground pits), unstable support foundations (e.g., stopping on top of a manhole cover), or unexpected and significant shifts in the load above the platform. Traditional outrigger systems cannot detect these risks. Once the support fails, the platform will quickly become unstable and overturn, causing serious casualties and equipment and property damage.

[0005] Therefore, there is an urgent need for an intelligent outrigger system that can monitor the stability of the platform in real time and actively and quickly intervene to lock it when a tipping risk occurs. To this end, this invention designs a scissor lift aerial work platform with anti-tipping self-locking outriggers and its working method. Through continuous monitoring, algorithm judgment, audible and visual warnings, and active locking, the automated safety closed loop greatly reduces the dependence on operator experience. By using high-tech means, it transforms post-event remediation into pre-event prevention and in-event interruption, fundamentally improving the safety performance of the scissor lift aerial work platform. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a scissor lift aerial work platform with anti-tipping self-locking outriggers and its operating method, which solves the problems of existing scissor lift aerial work platform outrigger systems relying on human reaction speed, the limitations of risk assessment being singular and ambiguous, reliability and response speed issues, and the lack of a closed-loop safety management system.

[0007] The present invention achieves the above-mentioned technical objectives through the following technical means.

[0008] A scissor lift aerial work platform with anti-tipping self-locking outriggers includes a scissor lift aerial work platform body, outrigger assemblies, a telescopic drive mechanism, a self-locking control module, and an audible and visual alarm. Multiple outrigger assemblies are arranged around the base of the scissor lift aerial work platform body. The telescopic drive mechanism controls the telescopic movement of the outrigger assemblies. The telescopic drive mechanism is signal-connected to the self-locking control module and receives its control commands. The self-locking control module is also signal-connected to the audible and visual alarm. When a risk of tipping over is detected, the audible and visual alarm is activated to alert workers. The self-locking control module includes a sensing unit, a control unit, and an execution unit.

[0009] Furthermore, the outrigger assembly includes an outrigger body, an outrigger cylinder, and a foot plate. The outrigger cylinder is telescopically disposed within the outrigger body, and the foot plate is disposed at the end of the outrigger cylinder. The telescopic drive mechanism employs a hydraulic pump station and a reversing valve assembly.

[0010] Furthermore, the sensing unit includes a tilt sensor and a pressure sensor; the tilt sensor is installed on the chassis of the scissor lift platform body and is used to detect the tilt angle of the scissor lift platform body in the front-back direction and the left-right direction; there are multiple pressure sensors, which are respectively installed in the rodless chamber oil circuit and the rod chamber oil circuit of the outrigger cylinder, and on the contact surface between the outrigger plate and the ground, and are used to detect the supporting force of the outrigger assembly.

[0011] Furthermore, the control unit receives signals from the sensing unit and calculates the stability of the scissor lift platform body accordingly, and issues a locking command to the execution unit when it determines that there is a risk of tipping over; the control unit includes an ECU and a control panel, which has a pre-defined tipping judgment algorithm built in.

[0012] Furthermore, the execution unit includes a normally open two-position two-way hydraulic locking valve located on the hydraulic circuit of the outrigger cylinder; when the control unit issues a locking command, the hydraulic locking valve is energized and switches to the closed position, cutting off the return oil circuit of the outrigger cylinder to achieve hydraulic locking, and the scissor lift aerial work platform enters the "fail-safe" mode: when the system is powered off or malfunctions, the hydraulic locking valve remains open and does not affect the normal operation of the equipment, and is only energized and closed when locking is required.

[0013] A method for operating the aforementioned scissor lift aerial work platform with anti-tipping self-locking outriggers includes the following steps:

[0014] S1: The operator moves the scissor lift to a flat and solid ground in the target work area, turns on the power switch, and the whole machine control system and ECU start to power on. The ECU automatically performs a power-on self-test.

[0015] S2: Activate the telescopic drive mechanism to supply oil to the four outrigger cylinders, pushing the cylinder piston rods downwards and causing the outrigger body and foot plate to move downwards until they contact the ground. Once the foot plate contacts the ground, the oil pressure begins to rise, continuing to lift the entire chassis of the scissor lift platform off the ground until the entire weight is supported by the four outrigger assemblies. During this process, pressure sensors continuously monitor the pressure values ​​of each outrigger's oil circuit, and tilt sensors continuously monitor the levelness of the scissor lift platform's chassis. The ECU reads the sensor monitoring data in real time and makes a preliminary judgment on whether each outrigger assembly is effectively grounded and under load. If the pressure of a certain outrigger assembly is found to be significantly low, an intermittent alarm will be issued through the audible and visual alarm to prompt the operator to check the situation under that outrigger assembly.

[0016] S3: After the outrigger assembly is in place, the sensing unit works, and the tilt sensor measures the tilt angle values ​​θ_x and θ_y of the main body of the scissor lift in the front-back and left-right directions.

[0017] The pressure sensor synchronously measures the oil pressure values ​​P1, P2, P3, and P4 in the rodless chamber of the four outrigger cylinders. Based on the piston area of ​​the cylinder, the ECU calculates the actual supporting force F1, F2, F3, and F4 of the four outrigger components. Then, it executes its internal core risk judgment algorithm to determine whether there is a risk of tipping over.

[0018] S4: After the ECU determines that there is a risk of tipping over, it first sends the highest priority command to the audible and visual alarm. The audible and visual alarm emits a sharp, rapid sound accompanied by a red flash, strongly warning the operator on the main body of the scissor lift. At the same time, the ECU sends an electrical signal to the hydraulic locking valves on the hydraulic circuits of the four outrigger cylinders. After receiving the locking command from the ECU, the valve core of the hydraulic locking valve actuates and switches to the closed state, cutting off the return oil passage of all outrigger cylinders. The entire outrigger assembly becomes a rigid support to prevent the main body of the scissor lift from tilting further.

[0019] S5: After hearing the alarm and feeling the main body of the scissor lift stop moving, the operator should immediately stop all aerial work, get off the vehicle to check the ground conditions, the status of the outrigger assembly, and the load distribution of the main body of the scissor lift. After eliminating all potential hazards, the operator should press and hold the "System Reset" button on the control panel. After the ECU receives the reset signal, it will disconnect the power supply to the hydraulic lock valve, restore it to the normal open state, retract the outrigger assembly, and move the equipment.

[0020] Furthermore, during the process of the ECU executing its internal core risk assessment algorithm to determine whether there is a rollover risk, the algorithm inputs are: real-time data streams θ_x, θ_y, P1, P2, P3, P4; the algorithm output is: a rollover risk flag.

[0021] The ECU uses the following criteria to assess rollover risk based on its risk assessment algorithm:

[0022] Criterion 1: Levelness exceeds limit. When θ_x > θ_max or θ_y > θ_max, the risk output is True, indicating that there is a risk. Here, θ_max is the preset maximum allowable tilt angle threshold. Tilting in any direction exceeding this value will directly trigger the risk.

[0023] Criterion 2: Uneven force distribution on the outriggers exceeds the limit;

[0024] First, calculate the average supporting force F_avg of the four outrigger components;

[0025] Then calculate the percentage deviation of the support force of each outrigger assembly from the average support force, Deviationn, where n = 1, 2, 3, 4; Deviation1, Deviation2, Deviation3, and Deviation4 represent the percentage deviation of the support force of the first, second, third, and fourth outrigger assemblies from the average support force, respectively.

[0026] When the maximum value among Deviation1, Deviation2, Deviation3, and Deviation4 is greater than D_max, the risk output is True, indicating that there is a risk. Here, D_max is the preset maximum allowable deviation percentage threshold.

[0027] Criterion 3: Loss of pressure in one leg;

[0028] When the supporting force of the outrigger assembly is less than F_min, the risk output is True, indicating that there is a risk. F_min is the minimum supporting force threshold of the outrigger, which is used to determine whether the ground under the outrigger assembly suddenly collapses, causing complete loss of support.

[0029] If any of the above criteria is met, the ECU will immediately set the rollover risk flag to True.

[0030] The present invention has the following beneficial effects:

[0031] 1. It solves the problem of the limitation of human reaction speed. When a dangerous situation occurs, there is a time delay from the time the platform shows signs of instability to the time the operator notices and reacts. Often, the best time for intervention is missed, and it is impossible to prevent the instantaneous overturning accident. The device forms a complete automated control link of "perception-decision-execution-alarm". The central controller replaces the human brain to make high-speed judgments, and the hydraulic locking valve of the execution unit replaces the human hand to perform instantaneous operations. It eliminates the delay of human reaction, and the response speed reaches the millisecond level, which greatly improves the timeliness and reliability of intervention and builds an efficient and reliable automated safety closed loop.

[0032] 2. This solution addresses the limitations and ambiguity in risk assessment of existing scissor lift aerial work platform outrigger systems. Some existing safety devices may rely solely on levelness or the force exerted on a single outrigger for assessment, failing to comprehensively and accurately evaluate the platform's overall stability. This can easily lead to misjudgments or omissions, resulting in insufficient reliability. The core multi-criteria parallel algorithm comprehensively assesses the platform's levelness and the balance of force exerted on multiple outriggers, covering various hazardous conditions such as uneven ground, localized collapses, and outrigger suspension. This cross-validation strategy significantly enhances the accuracy, sensitivity, and comprehensiveness of risk identification. Even if the platform's tilt angle has not exceeded the limit, abnormal changes in outrigger force can provide early warnings, truly achieving "prevention before the event."

[0033] 3. This design addresses the reliability and response speed issues of existing locking mechanisms in scissor lift outrigger systems. A key technical challenge was designing an actuator that could operate normally without disrupting equipment, yet provide instantaneous locking force and high reliability in emergencies. A normally open 2-position 2-way hydraulic locking valve was chosen as the actuator. This ingenious design maintains the flow path during power outages or malfunctions, ensuring uninterrupted operation; locking only occurs when power is restored. This design guarantees both ease of daily use and extremely high reliability and immense locking force in emergency situations, instantly averting danger.

[0034] 4. This design addresses the lack of a closed-loop safety management system in existing scissor lift aerial work platform outrigger systems. A key safety management issue is ensuring that the locking mechanism is completely eliminated before releasing the lock after a hazard occurs, preventing secondary accidents caused by accidental reset. A normally open 2-position 2-way hydraulic locking valve is cleverly designed as the actuator. It maintains the flow path during power outages or malfunctions, ensuring normal equipment operation; the lock is only closed when power is restored. This design guarantees both ease of daily use and extremely high reliability and powerful locking force (based on the hydraulic locking principle) for emergency locking, instantly stopping danger and making safety management and reset procedures more rigorous. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the scissor lift aerial work platform described in this invention.

[0036] Figure 2 This is a flowchart illustrating the workflow of the scissor lift aerial work platform described in this invention.

[0037] Figure 3 This is a schematic diagram of the control principle of the outrigger assembly in the scissor lift aerial work platform of the present invention.

[0038] In the diagram: 1-Scissor lift aerial work platform main body; 2-Outrigger assembly; 3-Telescopic drive mechanism; 4-Self-locking control module; 5-Audible and visual alarm. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0040] It should be noted that when a component is described as being "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] like Figure 1 As shown, the anti-tipping self-locking outrigger scissor lift aerial work platform of the present invention includes a scissor lift aerial work platform body 1, outrigger assemblies 2, telescopic drive mechanism 3, self-locking control module 4, and audible and visual alarm 5. Multiple outrigger assemblies 2 (preferably four in this embodiment) are evenly distributed at the base of the scissor lift aerial work platform body 1. The telescopic drive mechanism 3 drives the extension and retraction of the outrigger cylinders. The self-locking control module 4 includes a sensing unit, a control unit, and an execution unit, used to achieve comprehensive control of the anti-tipping self-locking outriggers.

[0042] The sensing unit is used to monitor the attitude information of the main body 1 of the scissor lift aerial work platform and the force information of the outrigger assembly 2 in real time. The control unit is connected to the sensing unit, and the execution unit is connected to the control unit and the outrigger cylinder. The execution unit responds to the locking command to mechanically lock the extension and retraction movement of the outrigger cylinder. The audible and visual alarm 5 is connected to the control unit, thus constructing a complete and efficient "sensing-decision-execution-alarm" automated control closed loop, ensuring the continuity and immediacy from risk identification to safety response, and greatly reducing the accidents that may be caused by slow human reaction.

[0043] Outrigger assembly 2 includes outrigger body, outrigger cylinder, and outrigger plate. The outrigger cylinder is telescopically mounted inside the outrigger body, and the outrigger plate is located at the end of the outrigger cylinder. The telescopic drive mechanism 3 adopts a hydraulic pump station and a reversing valve group. The outrigger body is an "X"-shaped scissor structure or a vertical telescopic structure, ensuring that the outrigger system itself has a robust mechanical structure and a mature and reliable drive method, laying a solid physical foundation for the subsequent intelligent anti-rollover function.

[0044] The sensing unit includes tilt sensors and pressure sensors. The tilt sensors are mounted on the chassis of the scissor lift platform body 1 to detect the tilt angles of the scissor lift platform body 1 in the X and Y axis directions. Multiple pressure sensors are installed in the rodless and rod-type hydraulic circuits of the outrigger cylinders, and at the contact surface between the outrigger plate and the ground. These sensors detect the supporting force of the outrigger assemblies 2, accurately obtaining key parameters of the stability state of the scissor lift platform body 1. The tilt sensors directly monitor the absolute horizontal attitude of the scissor lift platform body 1, providing a direct indicator of overall stability. The pressure sensors monitor hydraulic pressure or the force on the outrigger plates, indirectly calculating the actual supporting force of each outrigger assembly 2, thereby determining the balance and effectiveness of the support.

[0045] The control unit receives signals from the sensing unit and calculates the stability of the scissor lift platform body 1 accordingly. It issues a locking command when a tipping risk is detected. The control unit consists of a central controller (ECU) and a control panel, and it has a built-in pre-defined tipping detection algorithm. This algorithm determines a tipping risk when the received tilt angle exceeds a first safety threshold or when the calculated difference in support force between the outrigger components 2 exceeds a second safety threshold. It can process sensor data at high speed and make risk judgments based on preset logic. Its core function is a "multi-criteria parallel algorithm," which does not rely on a single condition but comprehensively evaluates the tilt angle and the differences in force between the outriggers. Its advantage lies in greatly enhancing the sensitivity and accuracy of risk judgment. Even if the platform's tilt angle has not exceeded the limit, but the force on individual outriggers has changed drastically (such as ground subsidence), the algorithm can detect this risk in advance and trigger protection, achieving true "prevention before the event."

[0046] The actuator includes a normally open two-position two-way hydraulic lock-up valve located on the hydraulic circuit of the outrigger cylinder. When the control unit issues a lock-up command, the hydraulic lock-up valve is energized and switches to the closed position, cutting off the return oil circuit of the outrigger cylinder and realizing hydraulic lock-up. This achieves a "fail-safe" mode: when the system is powered off or malfunctions, the valve remains open and does not affect the normal operation of the equipment (such as outrigger retraction); it is only energized to close when lock-up is required. This design is safe and reliable, with a huge locking force (based on the hydraulic lock-up principle) and an extremely fast response speed (millisecond level), which can instantly stop dangerous situations and provide the most critical technical means for ultimate safety assurance.

[0047] When the control unit determines that there is a risk of tipping over, it triggers the audible and visual alarm 5 to issue an alarm. When the control unit issues a locking command, it also triggers the audible and visual alarm 5 to issue an alarm to remind relevant personnel to pay attention.

[0048] Reference Figure 2 , 3 As shown, the method of using the anti-tipping self-locking outrigger scissor lift aerial work platform of the present invention is as follows:

[0049] S1, Platform positioning and system power-on self-test;

[0050] The operator moves the scissor lift to the target work area and chooses a flat and solid surface. The operator switches the power switch on the platform chassis to the on position, and the whole machine control system and the dedicated central controller (ECU) are powered on. The ECU will automatically perform a power-on self-test (POST) on the self-locking control module 4.

[0051] The self-test process includes: checking whether the tilt sensor communication is normal, checking whether the readings of each pressure sensor are near zero (i.e., the normal value under no-load conditions), and checking whether the circuit path of the hydraulic lock valve is normal. The audible and visual alarm 5 will emit a short beep to indicate that the self-test is complete and there is no fault. If any equipment is abnormal, the audible and visual alarm 5 will continuously beep and display a fault code on the control panel, prompting the operator that the next operation cannot be performed.

[0052] S2, the outrigger extends and the initial support is established;

[0053] Start the telescopic drive mechanism 3 to supply oil to the four outrigger cylinders, push the cylinder piston rods downward to extend downward, and drive the outrigger body and outrigger plate downward until they contact the ground. When the outrigger plate contacts the ground, the oil pressure begins to rise, and continues to lift the entire chassis of the scissor lift aerial work platform 1 off the ground until the entire weight is supported by the four outrigger components 2, and the tires of the scissor lift aerial work platform are about to leave the ground.

[0054] System monitoring: During this process, the pressure sensor continuously monitors the pressure value of each outrigger oil circuit, the tilt sensor continuously monitors the levelness of the chassis, the ECU reads these data in real time, and makes a preliminary judgment on whether each outrigger assembly 2 has been effectively grounded and under force. If it is found that the pressure of a certain outrigger assembly 2 is significantly low (possibly suspended), the ECU will issue an intermittent alarm through the audible and visual alarm 5 to prompt the operator to check the situation under the outrigger assembly 2.

[0055] S3, the active safety monitoring and risk assessment algorithm is running;

[0056] The system enters a monitored state: After outrigger assembly 2 completes its support, the system enters a continuous active safety monitoring state. This process is completely automatic and requires no manual intervention.

[0057] The sensing unit operates as follows: The tilt sensor measures the tilt angle values ​​θ_x and θ_y of the main body 1 of the scissor lift aerial work platform in the X-axis (front-back direction) and Y-axis (left-right direction) at a high frequency of tens of times per second.

[0058] The pressure sensor synchronously measures the oil pressure values ​​P1, P2, P3, and P4 in the rodless chamber of each outrigger cylinder (corresponding to the four outriggers). Based on the piston area of ​​the cylinder, the ECU calculates the actual supporting force F1, F2, F3, and F4 for each outrigger assembly 2.

[0059] Next, the ECU executes its internal core risk assessment algorithm to determine whether a risk exists. The specific assessment method is as follows:

[0060] Algorithm input: Real-time data stream θ_x, θ_y, P1, P2, P3, P4;

[0061] Algorithm output: a boolean value (True or False) indicating the rollover risk flag;

[0062] Criterion 1: Levelness exceeds limit. When θ_x > θ_max or θ_y > θ_max, the risk output is True, indicating that there is a risk. Here, θ_max is the preset maximum allowable tilt angle threshold (e.g., 3°). Tilting in any direction exceeding this value will directly trigger the risk.

[0063] Criterion 2: Uneven force distribution on the outriggers exceeds the limit;

[0064] First, calculate the average supporting force of the four outrigger components 2: F_avg = (F1 + F2 + F3 + F4) / 4;

[0065] Then, calculate the percentage deviation between the support force and the average support force of each outrigger assembly 2, where n = 1, 2, 3, 4; Deviation1, Deviation2, Deviation3, and Deviation4 represent the percentage deviation between the support force and the average support force of the first outrigger assembly 2, the second outrigger assembly 2, the third outrigger assembly 2, and the fourth outrigger assembly 2, respectively.

[0066] When the maximum value among Deviation1, Deviation2, Deviation3, and Deviation4 is greater than D_max, the risk output is True, indicating that there is a risk. Here, D_max is the preset maximum allowable deviation percentage threshold (e.g., 25%). This means that if the force on a certain outrigger component 2 is more than 25% lighter (or heavier) than the average value, it indicates that the weight distribution of the scissor lift aerial work platform body 1 is extremely uneven, and there is a risk of tipping over.

[0067] Criterion 3: Loss of pressure in one leg;

[0068] When the supporting force of outrigger assembly 2 is less than F_min, the risk output is True, indicating that there is a risk. F_min is the minimum supporting force threshold of the outrigger (e.g., 100 kgf), which is used to determine whether the ground below outrigger assembly 2 suddenly collapses, causing complete loss of support.

[0069] If any of the above criteria is met, the ECU will immediately set the rollover risk flag to True.

[0070] S4, Risk Response and Automatic Lockout;

[0071] Trigger alarm: After the ECU determines that there is a risk of tipping over (the tipping risk flag is set to True), it first sends the highest priority command to the audible and visual alarm 5. The audible and visual alarm 5 emits a sharp and rapid sound accompanied by a red flash, strongly warning the operator on the main body 1 of the scissor lift aerial work platform.

[0072] Execute lock-up: Simultaneously, the ECU sends an electrical signal to the hydraulic lock-up valves on the hydraulic circuits of the four outrigger cylinders;

[0073] These locking valves are normally open, allowing hydraulic oil to flow freely for normal outrigger extension and retraction. Upon receiving the locking command from the ECU, the valve core quickly moves to the closed state. This action cuts off the return oil passage of all outrigger cylinders. Due to the incompressibility of hydraulic oil, the cylinder piston is firmly fixed in its current position and cannot retract. The entire outrigger assembly 2 changes from a "retractable support" to a "rigid support", thereby forcibly preventing further tilting of the scissor lift aerial work platform body 1.

[0074] S5, Lockout post-processing and system reset;

[0075] Operator action: After hearing the alarm and feeling the movement of the scissor lift body 1 stop, the operator shall immediately stop all aerial work and slowly lower the scissor lift body 1 to the lowest position at the lowest speed using the controller on the scissor lift body 1.

[0076] System status: After the scissor lift platform body 1 is lowered to the lowest position, the outrigger assembly 2 is unloaded, and the hydraulic locking valve remains closed and locked to ensure that the scissor lift platform body 1 will not move unexpectedly during the risk assessment process;

[0077] Reset Operation: The operator gets off the vehicle to check the ground conditions (such as collapse or softness), the status of outrigger assembly 2, and the load distribution of the scissor lift aerial work platform body 1. After eliminating all potential hazards, the operator needs to press and hold the "System Reset" button on the control panel for 3 seconds. After the ECU receives the reset signal, it will disconnect the power supply to the hydraulic lock valve and restore it to its normal open state. Only then can the outrigger assembly 2 be retracted and the equipment moved normally.

[0078] It should be noted that, in this document, relational terms such as "first" and "second" are used merely 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. Content not described in detail in this specification is prior art known to those skilled in the art.

[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A scissor lift aerial work platform with anti-tipping self-locking outriggers, characterized in that, The system includes a scissor lift aerial work platform body (1), outrigger assemblies (2), telescopic drive mechanism (3), self-locking control module (4), and audible and visual alarm (5). Multiple outrigger assemblies (2) are arranged around the base of the scissor lift aerial work platform body (1). The outrigger assemblies (2) are controlled by the telescopic drive mechanism (3) to extend and retract. The telescopic drive mechanism (3) is connected to the self-locking control module (4) and receives its control commands. The self-locking control module (4) is also connected to the audible and visual alarm (5). When it is determined that there is a risk of tipping over on the scissor lift aerial work platform, the audible and visual alarm (5) is controlled to issue an audible and visual alarm to warn the workers. The self-locking control module (4) includes a sensing unit, a control unit, and an execution unit.

2. The scissor lift aerial work platform with anti-tipping self-locking outriggers according to claim 1, characterized in that, The outrigger assembly (2) includes an outrigger body, an outrigger cylinder, and an outrigger plate. The outrigger cylinder is telescopically mounted inside the outrigger body, and the outrigger plate is mounted at the end of the outrigger cylinder. The telescopic drive mechanism (3) uses a hydraulic pump station and a reversing valve group.

3. The scissor lift aerial work platform with anti-tipping self-locking outriggers according to claim 2, characterized in that, The sensing unit includes a tilt sensor and a pressure sensor; the tilt sensor is set on the chassis of the scissor lift body (1) and is used to detect the tilt angle of the scissor lift body (1) in the front-back direction and the left-right direction; there are multiple pressure sensors, which are respectively set in the rodless chamber oil circuit, the rod chamber oil circuit of the outrigger cylinder, and the contact surface between the outrigger plate and the ground, and are used to detect the supporting force of the outrigger assembly (2).

4. The scissor lift aerial work platform with anti-tipping self-locking outriggers according to claim 3, characterized in that, The control unit receives signals from the sensing unit and calculates the stability of the scissor lift platform body (1) accordingly. When it is determined that there is a risk of overturning, it issues a locking command to the execution unit. The control unit includes an ECU and a control panel, which has a pre-defined overturning judgment algorithm built in.

5. The scissor lift aerial work platform with anti-tipping self-locking outriggers according to claim 4, characterized in that, The execution unit includes a normally open two-position two-way hydraulic locking valve located on the hydraulic circuit of the outrigger cylinder. When the control unit issues a locking command, the hydraulic locking valve is energized and switches to the closed position, cutting off the return oil circuit of the outrigger cylinder to achieve hydraulic locking. The scissor lift aerial work platform enters the "fail-safe" mode: when the system is powered off or malfunctions, the hydraulic locking valve remains open and does not affect the normal operation of the equipment. It is only energized and closed when locking is required.

6. A method for operating a scissor lift aerial work platform with anti-tipping self-locking outriggers as described in claim 5, characterized in that, The process includes the following: S1: The operator moves the scissor lift to a flat and solid ground in the target work area, turns on the power switch, and the whole machine control system and ECU start to power on. The ECU automatically performs a power-on self-test. S2: Start the telescopic drive mechanism (3), supply oil to the four outrigger cylinders, push the cylinder piston rod to extend downward, drive the outrigger body and outrigger plate to move downward until they contact the ground. When the outrigger plate contacts the ground, the oil pressure begins to rise, and continues to lift the chassis of the entire scissor lift platform (1) off the ground until the entire weight is supported by the four outrigger components (2). During this process, the pressure sensor continuously monitors the pressure value of each outrigger oil circuit, the tilt sensor continuously monitors the levelness of the chassis of the scissor lift platform (1), the ECU reads the sensor monitoring data in real time, and makes a preliminary judgment on whether each outrigger component (2) has been effectively grounded and under force. If the pressure of a certain outrigger component (2) is found to be significantly low, an intermittent alarm is issued through the sound and light alarm (5) to prompt the operator to check the situation below the outrigger component (2). S3: After the outrigger assembly (2) is in place, the sensing unit works and the tilt sensor measures the tilt angle values ​​θ_x and θ_y of the main body (1) of the scissor lift in the front-back and left-right directions. The pressure sensor synchronously measures the oil pressure values ​​P1, P2, P3, and P4 in the rodless chamber of the four outrigger cylinders. Based on the piston area of ​​the cylinder, the ECU calculates the actual supporting forces F1, F2, F3, and F4 of the four outrigger components (2), and then executes its internal core risk judgment algorithm to determine whether there is a risk of overturning. S4: After the ECU determines that there is a risk of tipping over, it first sends the highest priority command to the audible and visual alarm (5). The audible and visual alarm (5) emits a sharp and rapid sound accompanied by a red flash, strongly warning the operator on the main body (1) of the scissor lift platform. At the same time, the ECU sends an electrical signal to the hydraulic locking valves on the hydraulic circuits of the four outrigger cylinders. After receiving the locking command from the ECU, the valve core of the hydraulic locking valve moves and switches to the closed state, cutting off the return oil passage of all outrigger cylinders. The entire outrigger assembly (2) becomes a rigid support to prevent the main body (1) of the scissor lift platform from tilting further. S5: After hearing the alarm and feeling the scissor lift main body (1) stop moving, the operator should immediately stop all high-altitude operations, get off the vehicle to check the ground conditions, the status of the outrigger assembly (2) and the load distribution of the scissor lift main body (1), and eliminate all hidden dangers. Then, the operator should press and hold the "System Reset" button on the control panel. After the ECU receives the reset signal, it will disconnect the power supply to the hydraulic lock valve, restore it to the normal open state, retract the outrigger assembly (2), and move the equipment.

7. The working method of the scissor lift aerial work platform with anti-tipping self-locking outriggers according to claim 6, characterized in that, During the process of the ECU executing its internal core risk assessment algorithm to determine whether there is a risk of rollover, the algorithm input is: real-time data stream θ_x, θ_y, P1, P2, P3, P4; the algorithm output is: rollover risk flag. The ECU uses the following criteria to assess rollover risk based on its risk assessment algorithm: Criterion 1: Levelness exceeds limit. When θ_x > θ_max or θ_y > θ_max, the risk output is True, indicating that there is a risk. Here, θ_max is the preset maximum allowable tilt angle threshold. Tilting in any direction exceeding this value will directly trigger the risk. Criterion 2: Uneven force distribution on the outriggers exceeds the limit; First, calculate the average supporting force F_avg of the four outrigger components (2); Then calculate the percentage deviation of the support force of each leg assembly (2) from the average support force, Deviationn, n=1,2,3,4; Deviation1, Deviation2, Deviation3, and Deviation4 represent the percentage deviation of the support force of the first leg assembly (2), the second leg assembly (2), the third leg assembly (2), and the fourth leg assembly (2) from the average support force, respectively. When the maximum value among Deviation1, Deviation2, Deviation3, and Deviation4 is greater than D_max, the risk output is True, indicating that there is a risk. Here, D_max is the preset maximum allowable deviation percentage threshold. Criterion 3: Loss of pressure in one leg; When the supporting force of the outrigger assembly (2) is less than F_min, the risk output is True, indicating that there is a risk. F_min is the minimum supporting force threshold of the outrigger, which is used to determine whether the ground below the outrigger assembly (2) suddenly collapses, resulting in a complete loss of support. If any of the above criteria is met, the ECU will immediately set the rollover risk flag to True.

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