Scissor fork type aerial work platform roof rushing prevention system and using method
By using multi-sensor fusion and redundant design, the problem of single-point signal interference in the height detection of scissor lift aerial work platforms has been solved, enabling multi-dimensional real-time status monitoring and adaptive safety control, thus improving detection accuracy and system stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-08
- Publication Date
- 2026-04-03
AI Technical Summary
Existing height detection systems for scissor lift aerial work platforms rely on single-point signals, which are easily affected by transmission backlash, mechanical wear, and environmental interference. Furthermore, insufficient multi-source data processing leads to a decrease in detection accuracy and reliability.
It adopts a multi-sensor fusion scheme, integrating angle sensors, pressure sensors, and chassis tilt sensors, and can be equipped with multi-point laser ranging and inertial measurement units to achieve synchronous acquisition and fusion processing of multi-dimensional data such as height, load, and attitude. Combined with redundant sensors and mechanical limit devices, it forms a multi-level safety protection mechanism.
It significantly improves the accuracy and reliability of height detection, realizes multi-dimensional real-time status monitoring, has adaptive adjustment capabilities, enhances the system's fault tolerance and security, and supports intelligent management.
Smart Images
Figure CN121778643A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of aerial work platform technology, specifically to an anti-overrun system for scissor lift aerial work platforms and its usage method. Background Technology
[0002] In the field of safety automation control for aerial work platforms, especially scissor lifts, existing technologies generally employ single-mode height detection solutions. For example, mainstream scissor lifts on the market are typically equipped with single-point detection devices such as mechanical limit switches, rotary encoders, or laser rangefinders to sense the final position or height of critical nodes during platform lifting. These configurations can meet basic anti-overrun and height-limiting functions, preventing the platform from exceeding set safety limits, but they have various limitations. Rotary encoder detection relies on the precise fixing and long-term stability of mechanical transmission components, making it susceptible to data drift or false alarms due to transmission clearances, mechanical wear, and environmental interference. While laser rangefinders offer the advantage of non-contact detection, they are mostly installed at the corners or center of a single platform, relying too heavily on single-point spatial echoes. Once obstructed by foreign objects, dust accumulation, or strong external light interference, the reliability and accuracy of detection decrease significantly. Some manufacturers use redundant mechanical or magnetic limit devices, using different physical signals for multi-level limiting, but these are often only used as a final safety measure and cannot achieve multi-dimensional fusion perception of the platform's real-time status.
[0003] Therefore, there is an urgent need for a technical solution that can achieve multi-dimensional height dynamic monitoring of scissor lift aerial work platforms without relying on single-point signals, and has sensor-level redundant automatic judgment and multi-source data processing capabilities. Summary of the Invention
[0004] To solve the above technical problems, the present invention provides a scissor lift anti-collision system and its usage method, which can realize the anti-collision of the scissor lift.
[0005] The present invention adopts the following technical solution: A scissor lift aerial work platform anti-collision system includes: Chassis frame, equipped with wheels and mounting platform; The scissor lift assembly is connected to the chassis frame mounting platform via pins and features multi-stage cross articulated arms. The luffing cylinder, connected between the chassis frame and the scissor lift assembly, has a cylinder lowering valve located on the cross articulated arm; An angle sensor, installed on the cross articulated arm of the scissor lift assembly, transmits the angle value of the cross articulated arm change to the controller via a voltage signal; The pressure sensor is installed on the cylinder lowering valve of the luffing cylinder and transmits the weight of the load to the controller through a linear voltage signal. The chassis tilt sensor is mounted on the chassis frame; The controller is electrically connected to the angle sensor, pressure sensor, and chassis tilt sensor. By integrating these core components, multi-dimensional data acquisition of the scissor lift platform's height, load, and tilt status was achieved, providing a hardware foundation for subsequent intelligent judgment and control, and enhancing the system's structural integrity and functional integration.
[0006] Preferably, the system also includes an audible and visual alarm device electrically connected to the controller. The audible and visual alarm device is connected to the power supply through an independent circuit, ensuring that the alarm device can still work independently when the control circuit fails. This improves the system's safety redundancy and warning reliability, and effectively avoids the risk of overall failure due to shared power supply.
[0007] Preferably, a multi-point laser ranging unit is also included. The multi-point laser ranging unit is installed at the intersection of the cross articulated arms, the four corners of the mounting platform, and the fixed points of the chassis frame. It is used to obtain the local vertical distance between each key node of the chassis frame and the ground or working surface. The ranging units maintain the consistency of measurement timing through synchronous triggering signals, realizing synchronous detection of the spatial height of the platform at multiple positions and angles.
[0008] Preferably, an inertial measurement unit (IMU) is also included. The IMU is integrated with the multi-point laser ranging unit and is used to synchronously acquire the attitude angle and acceleration information of each key node of the chassis frame. The IMU output signal is used to compensate for the projection error of the ranging unit in a non-vertical state. The integrated use of the inertial measurement unit and the laser ranging unit can synchronously acquire the attitude angle and acceleration information of the platform. Combined with the IMU data, the attitude compensation of the laser ranging results is performed, which effectively corrects the measurement error caused by platform tilt or vibration, and enhances the adaptability and data accuracy of the system under non-ideal working conditions.
[0009] A method for using a scissor lift aerial work platform anti-collision system, applicable to the scissor lift aerial work platform anti-collision system, further includes the following steps: S1: Calculation of the current height of the scissor lift; S2: Calculation of load at the current scissor lift height; S3: Acquisition of the controller's overshoot signal; S4: Collect pressure sensor voltage thresholds and voltage warning values for different chassis tilt angles, different equipment heights, and different loads; S5: When the controller recognizes that the current pressure sensor voltage signal V>=the current operating condition threshold Vym, the controller sends a command to the hydraulic cylinder lowering valve, which automatically lowers the valve for a preset time, and then stops sending commands. It covers the entire process from height calculation and load identification to overrun signal acquisition and early warning judgment. Through standardized operating procedures, the system has repeatable and configurable overrun prevention logic, which improves the system's operational standardization and intelligence level, and is suitable for safety control under different working conditions.
[0010] Preferably, in S1, the calculation of the current height of the scissor lift includes: the maximum height of the currently deployed cross articulated arm HC = sin(θ2-θ1)*L, and the current equipment height H = sin(θ)*L*HH / HC; where θ1: starting angle, θ2: maximum height angle, θ: current angle, L: length of the cross articulated arm, and HH: maximum equipment height. The specific mathematical model for height calculation is clearly given. Based on angle sensor data and fork arm geometric parameters, the real-time and accurate calculation of the current height of the platform is realized. This method has a simple structure and fast calculation, providing a reliable height benchmark for subsequent load judgment and anti-overrun threshold setting.
[0011] Preferably, in step S2, the calculation of the load at the current scissor lift height includes: a pressure sensor transmitting the load weight to the controller via a linear voltage signal; collecting pressure sensor voltage signals at different heights H of the cross articulated arm under no-load and full-load conditions; and the controller identifying the load at the current scissor lift height as M = Mmax * V / (Vmax - Vmin), where Mmax is the rated load of the current equipment, V is the voltage signal value of the current load at the current angle, Vmax is the voltage signal value of the rated load at the current angle, and Vmin is the voltage signal value of the no-load at the current angle. This provides a linearization method for load calculation. By collecting voltage signals under no-load and full-load conditions and combining them with the current voltage value, the actual load is dynamically calculated. This method enables real-time monitoring of the load status, provides data for adjusting the anti-overshoot threshold under different loads, and enhances the system's adaptive capability.
[0012] Preferably, in step S3, the acquisition of the top-impact signal by the controller includes: when the X and Y angles of the chassis tilt sensors are 0, firstly, sturdy obstacles of different equipment heights H are set to simulate the top-impact of the scissor lift platform. The current obstacle height = H, the load at height H = M, and the pressure sensor voltage signal of the load at height H = V. The controller acquires the pressure sensor voltage signals V1, V2...vmax at different lifting speeds and at different contact surfaces between the platform railing and the obstacle, and takes the minimum value Vm. Vm is the anti-top-impact threshold for the current chassis angle, current height H, and current load M. The experimental method and data processing flow for top-impact signal acquisition are described. By simulating collisions at different heights and speeds, the minimum voltage threshold is extracted as the basis for anti-top-impact judgment. This method enables the system to have self-learning capabilities under working conditions, and the threshold setting is closer to the actual collision scenario, improving the accuracy and reliability of anti-top-impact judgment.
[0013] As a preferred option, the system also includes the acquisition of overshoot warning signals from the controller: When the X and Y angles of the chassis tilt sensors are 0, low-hardness obstacles of different equipment heights H are first set to simulate the overshoot of the scissor lift platform. The current obstacle height = Hy, the load at height Hy = My, and the pressure sensor voltage signal of the load My at height Hy = Vy. The controller acquires the pressure sensor voltage signals Vy1, Vy2...vymax at different lifting speeds and at different contact surfaces between the platform railing and the obstacle, and takes the minimum value Vym. Vym is the overshoot warning value for the current chassis angle, current height Hy, and current load My. Based on the overshoot signal acquisition, a warning signal acquisition mechanism is further introduced, using low-hardness obstacles to simulate minor collisions and extract the warning threshold. This implements a multi-level safety response strategy (warning + emergency braking), improving the system's safety level and response finesse, and helping to intervene in advance before a real danger occurs.
[0014] Preferably, when the controller identifies that the current pressure sensor voltage signal V>=the current operating condition threshold Vm, the controller outputs a power cut-off. When the system determines that the overshoot threshold has been reached, the controller can directly cut off the power supply and forcibly stop the lifting action. This measure, as an ultimate safety protection method, ensures that physical-level power-off protection can still be achieved when the control system or actuator fails, greatly improving the system's fault tolerance and overall safety.
[0015] Compared with the prior art, the present invention has the following advantages: 1. Multi-sensor fusion improves detection accuracy and reliability: The system integrates angle sensors, pressure sensors, and chassis tilt sensors, and can be optionally equipped with multi-point laser ranging and inertial measurement units to achieve synchronous acquisition and fusion processing of multi-dimensional data such as height, load, and attitude. It overcomes the shortcomings of traditional single sensors that are susceptible to interference, data drift, or single-point failure, and significantly improves the overall accuracy and robustness of height detection and status judgment.
[0016] 2. Multi-level security protection and redundancy control mechanism: By employing a multi-level response strategy of "early warning-braking-power failure," combined with independently powered audible and visual alarms, redundant execution paths, and mechanical limit modules, a dual electrical-mechanical protection system is formed. Even in the event of a partial failure in the control system, safety can still be ensured through physical limits or independent alarms, greatly enhancing the system's fault tolerance and safety redundancy capabilities.
[0017] 3. Intelligent early warning and adaptive threshold setting: The system experimentally collects overshoot and warning voltage thresholds under different heights, loads, tilt angles, and lifting speeds, and possesses self-learning and adaptive adjustment capabilities. Combined with real-time data comparison, it can achieve multi-level intelligent judgment and warning from slight contact to severe overshoot, effectively avoiding false alarms and missed alarms, and improving the timeliness and accuracy of safety response.
[0018] 4. High integration and compact structure: The system's sensors and control units are rationally laid out, balancing ease of installation with signal stability. In particular, the coordinated arrangement of angle and pressure sensors enables real-time monitoring of the scissor lift's motion and load changes without significantly increasing structural complexity, making it suitable for retrofitting and upgrading existing equipment.
[0019] 5. Highly scalable and supports intelligent operation and maintenance: The system supports uploading data such as height, load, and alarm status to the cloud or remote monitoring platform in real time through human-machine interaction terminals and wireless communication interfaces, providing data support for equipment status tracking, early warning recording, and remote maintenance, which is conducive to realizing intelligent management and clustered scheduling of aerial work platforms.
[0020] 6. The calculation method is simple, efficient, and has good real-time performance: The system employs a height and load calculation model based on angle and voltage signals. This algorithm has low complexity and fast response speed, and can run in real time in an embedded controller, meeting the real-time control requirements of aerial work platforms while reducing the system's dependence on processing resources. Attached Figure Description
[0021] Figure 1 This is a structural diagram of a scissor lift aerial work platform.
[0022] Figure 2 A schematic diagram of the anti-overhead collision system modules.
[0023] In the diagram, the components are: chassis frame 1, moving wheels 1-1, mounting platform 1-2, scissor lift assembly 2, cross hinge arm 2-1, angle sensor 3, pressure sensor 4, chassis tilt sensor 5, controller 6, and sound and light alarm device 7. Detailed Implementation
[0024] To facilitate understanding of the technical solution of the present invention, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.
[0025] Example 1 like Figure 1-2 As shown, a scissor lift aerial work platform anti-collision system includes: Chassis frame 1, having casters 1-1 and mounting platform 1-2; The scissor lift assembly 2 is connected to the mounting platform 1-2 of the chassis frame via a pin and has a multi-stage cross articulated arm 2-1. The luffing cylinder is connected between the chassis frame 1 and the scissor lift assembly 2, and has a cylinder lowering valve set on the cross articulated arm 2-1; Angle sensor 3 is installed on the cross hinge arm 2-1 of the scissor lift assembly 2, and transmits the angle value of the cross hinge arm 2-1 to the controller 6 through a voltage signal; Pressure sensor 4 is installed on the cylinder lowering valve of the variable amplitude cylinder, and transmits the weight of the load to the controller 6 through a linear voltage signal; Chassis tilt sensor 5 is mounted on chassis frame 1; The controller 6 is electrically connected to the angle sensor 3, the pressure sensor 4, and the chassis tilt sensor 5. By integrating these core components, multi-dimensional data acquisition of the scissor lift platform's height, load, and tilt status was achieved, providing a hardware foundation for subsequent intelligent judgment and control, and enhancing the system's structural integrity and functional integration.
[0026] It also includes an audible and visual alarm device 7 electrically connected to the controller 6. The audible and visual alarm device 7 is connected to the power supply through an independent circuit, ensuring that the alarm device can still work independently when the control circuit fails. This improves the safety redundancy and warning reliability of the system and effectively avoids the risk of overall failure due to shared power supply.
[0027] A method for using a scissor lift aerial work platform anti-collision system, applicable to the scissor lift aerial work platform anti-collision system, further includes the following steps: S1: Calculation of the current height of the scissor lift; S2: Calculation of load at the current scissor lift height; S3: Acquisition of the controller's overshoot signal; S4: Collect pressure sensor voltage thresholds and voltage warning values for different chassis tilt angles, different equipment heights, and different loads; S5: When the controller 6 recognizes that the current pressure sensor voltage signal V>=the current operating condition threshold Vym, the controller 6 sends a command to the hydraulic cylinder lowering valve, which automatically lowers the valve for a preset time, and then stops sending commands. It covers the entire process from height calculation and load identification to overrun signal acquisition and early warning judgment. Through standardized operating procedures, the system has repeatable and configurable overrun prevention logic, which improves the system's operational standardization and intelligence level, and is suitable for safety control under different working conditions.
[0028] In S1, the calculation of the current height of the scissor lift includes: the maximum height of the currently deployed cross articulated arm 2-1, HC = sin(θ2-θ1)*L, and the current equipment height, H = sin(θ)*L*HH / HC; where θ1: starting angle, θ2: maximum height angle, θ: current angle, L: length of the cross articulated arm, and HH: maximum equipment height. The specific mathematical model for height calculation is clearly given. Based on angle sensor data and fork arm geometric parameters, the real-time and accurate calculation of the platform's current height is realized. This method has a simple structure and fast calculation, providing a reliable height benchmark for subsequent load judgment and anti-overrun threshold setting.
[0029] In step S2, the calculation of the load at the current scissor lift height includes: the pressure sensor transmits the load weight to the controller via a linear voltage signal; the voltage signals from the pressure sensor 4 at different heights H of the cross articulated arm 2-1 under no-load and full-load conditions are collected; the controller identifies the load at the current scissor lift height as M = Mmax * V / (Vmax - Vmin), where Mmax is the rated load of the current equipment, V is the voltage signal value of the current load at the current angle, Vmax is the voltage signal value of the rated load at the current angle, and Vmin is the voltage signal value of the no-load condition at the current angle. This provides a linearization method for load calculation. By collecting voltage signals under no-load and full-load conditions and combining them with the current voltage value, the actual load is dynamically calculated. This method enables real-time monitoring of the load status, provides data for adjusting the anti-overshoot threshold under different loads, and enhances the system's adaptive capability.
[0030] In step S3, the acquisition of the top-impact signal by the controller includes: when the X and Y angles of the chassis tilt sensors are 0, firstly, sturdy obstacles of different equipment heights H are set to simulate the top-impact of the scissor lift platform. The current obstacle height = H, the load at height H = M, and the pressure sensor voltage signal of the load at height H = V. The controller acquires the pressure sensor voltage signals V1, V2...vmax at different lifting speeds and at different contact surfaces between the platform railing and the obstacle, and takes the minimum value Vm. Vm is the anti-impact threshold for the current chassis angle, current height H, and current load M. The experimental method and data processing flow for top-impact signal acquisition are described. By simulating collisions at different heights and speeds, the minimum voltage threshold is extracted as the basis for anti-impact judgment. This method enables the system to have self-learning capabilities under working conditions, and the threshold setting is closer to the actual collision scenario, improving the accuracy and reliability of anti-impact judgment.
[0031] It also includes the acquisition of overshoot warning signals from the controller: When the X and Y angles of the chassis tilt sensors are 0, low-hardness obstacles of different equipment heights H are first set to simulate the overshoot of the scissor lift platform. The current obstacle height = Hy, the load at Hy height = My, and the pressure sensor voltage signal of the load My at Hy height = Vy. The controller acquires the pressure sensor voltage signals Vy1, Vy2...vymax at different lifting speeds and at different contact surfaces of the platform railing and obstacles, and takes the minimum value Vym. Vym is the anti-overshoot warning value for the current chassis angle, current height Hy, and current load My. Based on the overshoot signal acquisition, a warning signal acquisition mechanism is further introduced, using low-hardness obstacles to simulate minor collisions and extract warning thresholds. A multi-level safety response strategy (warning + emergency braking) is implemented, improving the system's safety level and response finesse, and helping to intervene in advance before a real danger occurs.
[0032] When the controller identifies that the current pressure sensor voltage signal V>=the current operating condition threshold Vm, the controller outputs a power cut-off. When the system determines that the overshoot threshold has been reached, the controller can directly cut off the power supply and forcibly stop the lifting action. This measure, as an ultimate safety protection method, ensures that physical-level power-off protection can still be achieved when the control system or actuator fails, greatly improving the system's fault tolerance and overall safety.
[0033] Example 2 The difference between Example 2 and Example 1 is that Example 2 also includes a multi-point laser ranging unit, an inertial measurement unit, a structural limiting module, and a human-computer interaction and communication terminal.
[0034] Multi-point laser ranging units are installed at the intersection of the cross articulated arms 2-1, the four corners of the mounting platform 1-2, and the fixed points of the chassis frame 1, respectively, to obtain the local vertical distance between each key node of the chassis frame 1 and the ground or working surface; the ranging units maintain the consistency of measurement timing through synchronous triggering signals, realizing synchronous detection of the spatial height of the platform at multiple positions and angles.
[0035] The inertial measurement unit (IMU) and the multi-point laser ranging unit are integrated and installed to synchronously acquire the attitude angle and acceleration information of each key node of the chassis frame 1. The IMU output signal is used to compensate for the projection error of the ranging unit in a non-vertical state. The integrated use of the inertial measurement unit and the laser ranging unit can synchronously acquire the attitude angle and acceleration information of the platform. Combined with the IMU data, the laser ranging results are used for attitude compensation, which effectively corrects the measurement error caused by platform tilt or vibration, and enhances the system's adaptability and data accuracy under non-ideal working conditions.
[0036] The structural limit module is rigidly connected between the scissor lift assembly 2 and the chassis frame 1 to provide mechanical high redundancy protection in the event of control system failure. The module includes an adjustable travel limit block and a rigid stop structure to ensure that the platform is forcibly locked at its physical limit position.
[0037] The human-machine interaction and communication terminal is connected to the central processing and control unit via a serial communication interface. It is used to display the current platform altitude, safety status, and early warning information. The terminal supports remote wireless communication to realize real-time reporting of altitude data and abnormal status to the cloud monitoring platform.
[0038] By employing a spatial dynamic contour mapping scheme combining multi-point laser ranging and inertial measurement units, multi-dimensional real-time detection of the height of scissor lift aerial work platforms was achieved. This effectively avoids measurement errors caused by traditional single-point measurements or angle sensors under platform tilt and complex stress conditions, significantly improving detection accuracy and anti-interference capabilities. Multi-source spatial data from key platform nodes are fused and modeled by the central processing and control unit, forming redundant feedback and anomaly verification mechanisms. This greatly improves the system's adaptive error correction capability against single-path signal failures or data drift, enhancing the reliability and safety of the height detection system.
[0039] Through dynamic data fusion by the processor and multi-level safety threshold linkage triggering, intelligent speed limiting and stop protection during the lifting process are effectively achieved, optimizing operational efficiency and reducing safety risks caused by height loss of control. The redundant execution path design and the synergistic effect of the mechanical limit module ensure that the platform can be forcibly locked at its physical limit position in the event of a control system or sensor failure, achieving dual safety protection and greatly improving the platform's system stability and practical application safety.
[0040] The integration of embedded display terminals and wireless communication interfaces enables the platform's current height and safety status to be reported to the operator console or cloud monitoring in real time, significantly improving the intelligence and response speed of operation and maintenance management, and reducing resource waste and blind spots in safety supervision caused by information lag. Multi-level redundant detection and feedback mechanisms expand the equipment's adaptability to harsh environments and diverse operating scenarios, providing a highly reliable and easily expandable solution for height detection of aerial work platforms.
[0041] In summary, through innovative data fusion using spatial geometric algorithms, redundant safety features, and mechanical linkage design, the height detection accuracy, safety, and system stability of the scissor lift platform have been significantly improved, and the application value of the equipment in high-risk and variable working conditions has been effectively expanded.
[0042] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention shall be determined by the scope defined in the claims. Any improvements and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall also be considered as within the scope of protection of the present invention.
Claims
1. A scissor lift aerial work platform anti-collision system, characterized in that, include: The chassis frame (1) has wheels (1-1) and a mounting platform (1-2). The scissor lift assembly (2) is connected to the mounting platform (1-2) of the chassis frame via a pin and has a multi-stage cross articulated arm (2-1). The luffing cylinder is connected between the chassis frame (1) and the scissor lift assembly (2) and has a cylinder lowering valve set on the cross articulated arm (2-1); An angle sensor (3) is installed on the cross hinge arm (2-1) of the scissor structure assembly (2) and transmits the angle value of the cross hinge arm (2-1) to the controller (6) through a voltage signal. The pressure sensor (4) is installed on the cylinder lowering valve of the variable amplitude cylinder and transmits the weight of the load to the controller (6) through a linear voltage signal. A chassis tilt sensor (5) is mounted on the chassis frame (1); The controller (6) is electrically connected to the angle sensor (3), the pressure sensor (4), and the chassis tilt sensor (5).
2. The anti-overrun system for scissor lift aerial work platforms according to claim 1, characterized in that, It also includes an audible and visual voice alarm device (7) electrically connected to the controller (6), which is connected to the power supply via an independent circuit.
3. The anti-overrun system for scissor lift aerial work platforms according to claim 1, characterized in that, It also includes a multi-point laser ranging unit, which is installed at the intersection of the cross articulated arm (2-1), the four corners of the installation platform (1-2) and the fixed point of the chassis frame (1) to obtain the local vertical distance between each key node of the chassis frame (1) and the ground or working surface; the ranging units maintain the consistency of measurement timing through synchronous triggering signals.
4. The anti-overrun system for scissor lift aerial work platforms according to claim 3, characterized in that, It also includes an inertial measurement unit, which is integrated with a multi-point laser ranging unit to synchronously collect attitude angle and acceleration information of each key node of the chassis frame (1); the IMU output signal is used to compensate for the projection error of the ranging unit in a non-vertical state.
5. A method for using an anti-collision system for a scissor lift aerial work platform, characterized in that, The anti-collision system for scissor lift aerial work platforms as described in any one of claims 1-4 further includes the following steps: S1: Calculation of the current height of the scissor lift; S2: Calculation of load at the current scissor lift height; S3: Acquisition of the controller's overshoot signal; S4: Collect pressure sensor voltage thresholds and voltage warning values for different chassis tilt angles, different equipment heights, and different loads; S5: When the controller (6) recognizes that the current pressure sensor voltage signal V>=the current working condition threshold Vym, the controller (6) sends a command to the cylinder lowering valve, which automatically lowers for a preset time, and then stops sending the command.
6. The method of using the anti-overrun system for a scissor lift aerial work platform according to claim 5, characterized in that, In S1, the calculation of the current height of the scissor lift includes: the maximum height of the current cross articulated arm (2-1) when it is deployed is HC=sin(θ2-θ1)*L, and the current equipment height is H=sin(θ)*L*HH / HC; where θ1: starting angle, θ2: maximum height angle, θ: current angle, L: length of cross articulated arm, and HH: maximum equipment height.
7. The method of using the anti-collision system for a scissor lift aerial work platform according to claim 5, characterized in that, In S2, the calculation of the load at the current scissor lift height includes: the pressure sensor transmits the weight of the load to the controller through a linear voltage signal, and collects the voltage signals of the pressure sensor (4) at different heights H of the cross articulated arm (2-1) when it is unloaded and fully loaded. The controller identifies the load at the current scissor lift height as M=Mmax*V / (Vmax-Vmin), where Mmax: the rated load of the current equipment, V: the voltage signal value of the current load at the current angle, Vmax: the voltage signal value of the rated load at the current angle, and Vmin: the voltage signal value of the unloaded load at the current angle.
8. The method of using the anti-collision system for a scissor lift aerial work platform according to claim 5, characterized in that, In S3, the acquisition of the controller's overshoot signal includes: when the chassis tilt sensor X and Y angles are 0, firstly, set up sturdy obstacles of different equipment heights H to simulate the overshoot of the scissor lift platform. The current obstacle height = H, the load at height H = M, and the pressure sensor voltage signal of the load at height H M = V; the controller acquires the pressure sensor voltage signals V1, V2...vmax at different lifting speeds and different contact surfaces of the platform railing and the obstacle, and takes the minimum value Vm. Vm is the anti-overshoot threshold for the current chassis angle, current height H, and current load M.
9. The method of using the anti-collision system for a scissor lift aerial work platform according to claim 5, characterized in that, It also includes the acquisition of the controller's overshoot warning signal: When the chassis tilt sensor X and Y angles are 0, firstly, low-hardness obstacles of different equipment heights H are set to simulate the overshoot of the scissor lift platform. The current obstacle height = Hy, the load at the height of Hy = My, and the pressure sensor voltage signal of the load My at the height of Hy = Vy; the controller acquires the pressure sensor voltage signals Vy1, Vy2...vymax at different lifting speeds and different contact surfaces of the platform railing and obstacles, and takes the minimum value Vym. Vym is the overshoot warning value for the current chassis angle, current height Hy, and current load My.
10. The method of using the anti-collision system for a scissor lift aerial work platform according to claim 5, characterized in that, When the controller recognizes that the current pressure sensor voltage signal V is greater than or equal to the current operating condition threshold Vm, the controller outputs a power cut-off switch.