Hydraulic lifting platform truck

Abstract

The hydraulic lifting platform truck comprises a base, and an upper plate is arranged above the base through a supporting mechanism and is parallel to the base; the upper plate ascends or descends relative to the base through the lifting mechanism; comprising a supporting mechanism, the supporting mechanism is of a three-point linkage structure and comprises a first fixing frame arranged below an upper plate, a first rotating column is arranged in the first fixing frame, and the first rotating column is in rigid connection with the upper plate; the supporting mechanism comprises a moving end, the moving end comprises an extending table, the extending table is lower than a second fixing frame, a second rotating column is arranged in the second fixing frame, and the two ends of a telescopic rod are hinged to the first rotating column and the second rotating column respectively to form a telescopic triangular supporting frame. Line support of a traditional sliding rail is converted into face support, and the non-deformability is improved by 60%.

Description

Technical Field

[0001] The present invention relates to the technical field of flatbed carts, in particular to a hydraulic lifting flatbed cart. Background Art

[0002] Hydraulic lift flatbed trolleys, core equipment for industrial handling, utilize a hydraulic system to raise and lower the platform, offering advantages such as ease of operation and smooth lifting. However, traditional equipment generally utilizes a single-track telescopic structure. When the telescopic platform is extended long distances and carrying heavy objects, the rails and connecting components are susceptible to deformation or fracture due to concentrated bending moments and shear overload, leading to the following core issues: Insufficient structural stability: With a single rail as support, the platform's lateral sway increases exponentially with the extension length, reaching over 30mm when unloaded and prone to tipping over when heavily loaded. Limited load-bearing capacity: Traditional structures have a load-bearing capacity of only 20-30 tons, and this capacity drops by 40% when the extension distance exceeds 1.5m, making them unable to meet the needs of handling large workpieces. Lack of safety protection: The platform lacks dynamic load monitoring and emergency protection mechanisms, making it prone to uncontrolled falls during power outages. The platform also lacks an active unloading function when overloaded, posing a high risk of safety accidents. Weak compound motion capabilities: Lifting, retracting, and steering movements require separate operations, preventing coordinated operation and resulting in low efficiency.

[0003] The essential defects of existing technologies lie in the unreasonable mechanical design of the supporting structure and the single function of the control system. It is urgent to break through the performance bottleneck of traditional equipment through the integration of structural innovation and intelligent control. Summary of the Invention

[0004] In view of the above problems existing in the prior art, the object of the present invention is to provide a hydraulic lifting flatbed cart that is conducive to improving the stability and load-bearing capacity defects.

[0005] To solve the above problems, the present invention adopts the following technical solution: a hydraulic lifting flatbed cart, comprising a base, an upper plate arranged above the base and parallel to the base via a supporting mechanism; the upper plate is raised or lowered relative to the base via a lifting mechanism;

[0006] It includes a supporting mechanism, which is a three-point linkage structure, including a first fixed frame arranged below the upper plate, the first fixed frame having a first rotating column built in, and the first rotating column is rigidly connected to the upper plate; the supporting mechanism includes a moving end, the moving end includes an extension platform, the extension platform is lower than a second fixed frame, the second fixed frame has a second rotating column built in, and the two ends of the telescopic rod are respectively hinged to the first rotating column and the second rotating column to form a retractable triangular support frame.

[0007] The lifting structure includes a guide portion, and the guide portion includes a first slide groove and a second slide groove respectively arranged on the left and right sides of the base and the upper plate, and the first slide groove and the second slide groove are arranged in parallel.

[0008] The lifting mechanism includes a first articulated frame and a second articulated frame. One end of the first articulated frame is arranged on the outside of the first slide groove of the base, and the other end is arranged on the upper plate and movably connected to the upper plate; one end of the second articulated frame is arranged on the outside of the second slide groove of the upper plate, and the other end is arranged on the base and movably connected to the base.

[0009] The lifting structure includes a first sliding rod placed in a first sliding groove and a second sliding rod placed in a second sliding groove; the left and right sides of the first sliding rod are connected to the first articulated frame, and the first articulated frame is connected to the second articulated frame through a fixed column to form an "X-shaped" lifting linkage mechanism; the left and right sides of the second sliding rod are connected to the second articulated frame. When in use, the first sliding rod and the second sliding rod slide back and forth in the corresponding sliding grooves respectively, so that the angle between the first articulated frame and the second articulated frame becomes larger or smaller, thereby driving the upper plate to rise or fall.

[0010] The guide portion includes an outer frame arranged on a base, a movable block is built into the outer frame, and the movable block is connected to a connecting plate via a three-stage telescopic hydraulic cylinder. The left and right sides of the connecting plate are fixedly connected to the first articulated frame.

[0011] Four sets of universal pulleys are symmetrically arranged at the bottom of the base plate, two of which are equipped with electromagnetic brakes.

[0012] The inner walls on the left and right sides of the upper plate are provided with transverse grooves, and the sliding blocks at the bottom of the extension platform are embedded in the transverse grooves.

[0013] A self-locking limit box is provided on the inner wall of the first slide groove, and the self-locking limit box has a power-off mechanical locking device for preventing the base from accidentally sliding.

[0014] An engineering plastic handle is provided on the upper plate, and a pressure sensor is provided inside the engineering plastic handle for performing force feedback in manual mode.

[0015] The flat-panel pusher has a built-in intelligent control system, including an input unit, which adapts to a preset processing mode based on dynamic load data and environmental perception data collected by sensors;

[0016] a processing unit, which automatically adjusts the control strategy based on the mode decision module and plans the multi-joint motion trajectory;

[0017] The output unit, based on the decision of the processing unit, outputs a PWM signal as a control instruction, controls the current flowing through the load through the drive circuit, and thus controls the hydraulic valve group.

[0018] Compared with the prior art, the beneficial technical effects of the present invention are:

[0019] 1. A breakthrough in structural stability and load-bearing capacity. This application provides a triangular support structure: a rigid triangle is formed by the telescopic rod, the upper plate, and the extension platform, transforming the traditional slide rail's "line support" into "surface support." The lateral sway amplitude is reduced from 30mm to 8mm (no load) and 15mm (50T heavy load), and the deformation resistance is improved by 60%;

[0020] The support structure provided by this application has a significant increase in load-bearing capacity: compared with the support structure of the existing technology, at the same extension distance, the load-bearing capacity is increased from 20T of traditional equipment to 50T, and as the extension length increases, the load-bearing capacity attenuation rate is reduced from 40% to 15%, meeting the needs of handling large workpieces;

[0021] 2. Improved hydraulic system performance. The hydraulic system provided in this application effectively improves positioning accuracy and efficiency. Specifically, the three-stage telescopic cylinder, combined with the servo throttle valve, achieves a positioning accuracy of ±0.5mm and a micro-speed adjustment capability (1mm / s) suitable for docking precision equipment. The efficiency of compound movements is increased by 40%;

[0022] Energy saving and reliability: The variable frequency pump unit combined with standby mode (power consumption <15%) saves 30% energy compared to traditional fixed-displacement pumps; the emergency accumulator and mechanical self-locking device reduce the risk of power outage and loss of control by 90%, and the overload protection response time is <5ms, far exceeding the industry standard (10ms);

[0023] 3. Intelligent control and safety protection. This application provides dynamic load management: based on data collected by sensors, load distribution is monitored in real time and the support force is automatically adjusted (for example, when a single side is heavily loaded, the corresponding telescopic rod stiffness is increased by 30%) to avoid structural damage caused by eccentric loading;

[0024] Dual redundant control: Dual operation via wireless remote control and mechanical handle, supporting switching to mechanical control mode in electromagnetic interference environments to ensure operational reliability; the fault diagnosis system can automatically locate problems such as hydraulic leaks and sensor failures, improving maintenance efficiency by 50%. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a hydraulic lift flatbed cart according to an embodiment of the present application;

[0026] Figure 2 This is a three-dimensional diagram of an embodiment of the present application;

[0027] Figure 3 For the embodiment of this application;

[0028] Figure 4 This is an enlarged view of part A of the embodiment of the present application;

[0029] Figure 5 This is an enlarged view of part B of the embodiment of the present application;

[0030] Explanation of the numbers in the figure: 1. Base; 2. First slide groove; 3. First slide rod; 31. First articulated frame; 32. Fixed column; 33. Second articulated frame; 34. Upper plate; 35. Second slide groove; 36. Second slide rod; 37. Lifting mechanism; 4. Horizontal groove; 41. Slider; 42. Extension table; 5. First fixed frame; 51. First rotating column; 52. Telescopic rod; 53. Second fixed frame; 54. Second rotating column; 55. Support mechanism; 6. Connecting plate; 61. Outer frame; 62. Movable block; 63. Three-stage telescopic hydraulic cylinder; 7. Handle; 8. Pulley; 9. Self-locking limit box. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be further described in detail below with reference to the embodiments and drawings.

[0032] like Figure 1-Figure 3 As shown, a hydraulic lifting flatbed cart includes a base 1, and four groups of universal pulleys 8 are symmetrically arranged at the bottom of the base 1, two of which are equipped with electromagnetic brakes; an upper plate 34 is arranged above the base 1 and parallel to the base 1 through a supporting mechanism 55; the upper plate 34 is raised or lowered relative to the base 1 through a lifting mechanism 37; it includes a supporting mechanism 55, and the supporting mechanism 55 is a three-point linkage structure, including a first fixed frame 5 arranged below the upper plate 34, the first fixed frame 5 has a first rotating column 51 built in, and the first rotating column 51 is rigidly connected to the upper plate 34; the supporting mechanism 55 includes a moving end, and the moving end includes an extension platform 42, and the extension platform 42 is lower than a second fixed frame 53, as shown in part B, the second fixed frame 53 has a second rotating column 54 built in, as shown in part A, and the two ends of the telescopic rod 52 are respectively hinged to the first rotating column 51 and the second rotating column 54 to form a retractable triangular support frame. When the extension platform 42 is extended, the telescopic rod 52 automatically adjusts its length so that the upper plate 34, the extension platform 42, and the telescopic rod 52 form an equilateral triangle (with a side length error of less than 1%), converting the platform load into axial pressure on the telescopic rod 52 (reducing the shear force of the slide rail by 60%). Finite element analysis shows that under the same load, the stress of the slide rail is reduced from 280MPa to 110MPa, which is lower than the yield strength of the material (345MPa). It should be noted that

[0033] In some preferred embodiments, the upper plate 34 has transverse grooves 4 formed on the inner walls on the left and right sides, and the sliders 41 at the bottom of the extension platform 42 are embedded in the transverse grooves 4; a ball guide pair (friction coefficient 0.015) is used, the manual pushing force is less than 50N, and in electric mode, it is driven by a double-acting hydraulic cylinder (maximum extension distance 2.8m, speed 100mm / s);

[0034] In some preferred embodiments, the bottom surface of the extension platform 42 is provided with T-shaped reinforcement ribs (spacing 200 mm), which form a grid-like bearing structure with the support points of the telescopic rod 52, and the surface is anti-slip treated (roughness Ra ≤ 3.2 μm) to prevent the goods from sliding.

[0035] In some preferred embodiments, the upper panel 34 is provided with an engineering plastic handle 7 , which incorporates a pressure sensor for force feedback in manual mode. This pressure sensor supports force feedback control in manual mode. An LED warning light strip is located along the edge of the handle 7 to display the device's operating status in real time (green for standby, yellow for operation, and red for fault).

[0036] The lifting structure 37 includes a guide portion, which includes a first slide groove 2 and a second slide groove 35 respectively provided on the left and right sides of the base 1 and the upper plate 34. The first slide groove 2 and the second slide groove 35 are provided in parallel.

[0037] The lifting mechanism 37 includes a first articulated frame 31 and a second articulated frame 33. One end of the first articulated frame 31 is located outside the first chute 2 of the base 1, and the other end is located on the upper plate 34 and is movably connected to the upper plate 34; one end of the second articulated frame 33 is located outside the second chute 35 of the upper plate 34, and the other end is located on the base 1 and is movably connected to the base 1.

[0038] The lifting structure 37 includes a first slide bar 3 placed in the first slide groove 2 and a second slide bar 36 placed in the second slide groove 35. The first slide bar 3 is connected to the first articulated frame 31 on both sides. The first articulated frame 31 is connected to the second articulated frame 33 via a fixed column 32, forming an "X-shaped" lifting linkage mechanism. The second slide bar 36 is connected to the second articulated frame 33 on both sides.

[0039] In some preferred embodiments, the inner wall of the first slide groove 2 is integrated with a self-locking limit box 9, which has a built-in power-off triggered mechanical locking device that can lock the slide bar within 0.2 seconds to prevent accidental sliding.

[0040] During use, the first slide bar 3 and the second slide bar 36 slide back and forth in the corresponding slide grooves, respectively, so that the angle between the first hinge frame 31 and the second hinge frame 33 becomes larger or smaller, thereby driving the upper plate 34 to rise or fall.

[0041] The guide portion comprises an outer frame 61 mounted on the base 1. This outer frame 61 houses a movable block 62, which is connected to a connecting plate 6 via a three-stage telescopic hydraulic cylinder 63. The left and right sides of this connecting plate 6 are fixedly connected to the first articulated frame 31. The bottom of the first articulated frame 31 is connected to the three-stage telescopic hydraulic cylinder 63 via the connecting plate 6. When the hydraulic cylinder retracts and contracts, it drives the two-layer articulated frame to expand and contract synchronously, achieving vertical lifting and lowering of the upper plate 34 and extension platform 42 (travel range: 0-1.5m, lifting speed: adjustable at 50mm / s).

[0042] In some preferred embodiments, the three-stage telescopic hydraulic cylinder 63 utilizes a high-strength chrome-plated piston rod (surface hardness ≥ HRC55) and a built-in displacement sensor (accuracy ±0.1mm). This supports multi-stage synchronous telescopic expansion and contraction, as well as single-stage fine adjustment, extending its applicability. In terms of load capacity, it boasts a rated operating pressure of 35MPa, a maximum load of 50 tons (vertical), and an overload protection pressure of 42MPa. The thickened cylinder body design (160mm first-stage diameter, 80mm third-stage diameter) ensures a balanced rigidity and telescopic ratio.

[0043] In some preferred embodiments, the base 1 is welded from Q345B high-strength steel, and four sets of universal pulleys 8 are symmetrically arranged at the bottom, two of which are equipped with electromagnetic brakes, supporting 360° free steering and precise positioning;

[0044] The lifting mechanism 37 and the supporting mechanism 55 are driven by a composite hydraulic system, which includes:

[0045] Power unit: Includes a twin gear pump assembly (45kW main pump + 15kW auxiliary pump), driven by a variable-frequency motor (adjustable speed from 500-3000rpm), supporting stepless flow control (0-200L / min); hydraulic oil tank capacity of 150L, ​​built-in oil level and temperature sensor (accuracy of ±1°C), and an automatic cooling fan (start temperature of 55°C, stop temperature of 45°C);

[0046] Actuator unit: includes main lifting module: three-stage telescopic hydraulic cylinder 63 (model HSGK-160 / 100 / 63) with bidirectional hydraulic lock, pressure maintenance accuracy of ±0.5MPa in static state; horizontal expansion module: double-acting hydraulic cylinder (cylinder diameter 80mm, stroke 3000mm), rigidly connected to the slide block 41, built-in magnetostrictive displacement sensor (resolution 0.01mm); steering module: planetary gear hydraulic motor (speed ratio 1:10), integrated angle encoder (accuracy ±0.1°), support ±90° steering adjustment, with mechanical limit block (buffer distance 5mm).

[0047] Control unit: includes proportional directional valve group (5-port, response time <10ms), supports PWM signal input (0-5V corresponds to 0-100% opening);

[0048] Pressure compensating valve (model DRV-10), automatically balancing load differences among multiple actuators (pressure fluctuation <2%);

[0049] The servo throttle valve (positioning accuracy ±0.5mm) is combined with displacement closed-loop control to achieve micro-speed precision adjustment (minimum speed 1mm / s).

[0050] Security Unit:

[0051] Overload relief valve (set pressure 42MPa), response time <5ms, with visual pressure pointer (accuracy ±1%FS);

[0052] Emergency accumulator (capacity 5L, pre-charge pressure 25MPa) maintains system pressure for 30s after power failure to ensure completion of current action or safe reset;

[0053] Temperature compensation module: When the oil temperature is greater than 65°C, the air cooling system (air volume 2000m³ / h) is activated to reduce the temperature to below 50°C within 30 minutes.

[0054] The hydraulic circuit characteristics of the composite hydraulic system are as follows:

[0055] Parallel priority circuit: When the flatbed cart described in this application is lifting, 80% of the main pump's flow rate is preferentially supplied to the main lifting cylinder to ensure rapid lifting in an emergency (e.g., in the event of a fault, the descent time for a 1.5m stroke is less than 10s);

[0056] Time-sharing multiplexing of the oil circuit: A solenoid directional valve (DC24V, switching time <30ms) is used to switch between lifting, extension, and steering modes, avoiding interference from multiple actions. For example, when performing the "extension + steering" compound action, the oil circuit operates according to the sequence of "first extending to 50% → turning 30° → continuing to extend";

[0057] Closed-loop pressure feedback: The pressure sensor (accuracy ±0.25% FS) collects the main oil circuit pressure in real time, and the controller PID algorithm adjusts the proportional valve opening to achieve stable control with pressure fluctuation less than 1%.

[0058] Example 1

[0059] A method for automatically adjusting the support force of a flatbed cart based on information collected by sensors, wherein the flatbed cart has a built-in intelligent control system.

[0060] Input units include:

[0061] Wireless remote control unit (effective distance 50m): includes 17 preset modes (such as "precision loading and unloading mode" and "maximum expansion mode"), and has a dual-button design to prevent accidental touches;

[0062] Dynamic load monitoring unit: The upper plate 34 of the flatbed cart described in this application is embedded with 8 sets of stress sensors (distributed at the four corners and the center) to collect real-time load distribution on the upper plate 34 (resolution 10kg). When the imbalance is greater than 5%, an audible and visual alarm is triggered;

[0063] Environmental perception unit: In some embodiments, the present application also includes a slope sensor (accuracy ±0.5°) and a visual recognition camera (1080P, supporting obstacle detection), which automatically adjusts the control strategy based on the collected slope and visual recognition information (such as limiting the maximum extension distance on a slope, etc.).

[0064] Including processing unit:

[0065] Mode decision module: Based on the kinematic inverse solution algorithm (calculation period < 20ms), it automatically plans the multi-joint motion trajectory to avoid mechanical interference (for example, when the extension platform 42 is extended, the distance from the second articulated frame 33 is maintained at least 50mm);

[0066] Safety verification unit: used to integrate strain gauge data (for example, monitoring the deformation of the telescopic rod 52 and the slide rail with an accuracy of 0.001 mm / m) with the load data of the upper plate 34 to build a structural safety model. When the deformation exceeds the safety threshold (0.3 mm / m), the retraction program is forcibly triggered.

[0067] Output units included:

[0068] Hydraulic valve group control: Based on the decision of the processing unit, it outputs PWM signals as control instructions, controls the current flowing through the load through the drive circuit, and thus controls the hydraulic valve group;

[0069] Mechanical locking linkage: After the action is completed, the hydraulic locking valve and the mechanical caliper (located at the hinge point of the telescopic rod 52) are activated simultaneously, and the double locking ensures that the platform displacement is less than 0.1mm in the static state;

[0070] In some preferred embodiments, the present application also includes a human-computer interaction unit, including a 7-inch color touch screen (resolution 800×480), which displays parameters such as pressure, displacement, temperature, etc. in real time and supports historical data query (storage capacity 1GB, can record 100,000 actions).

[0071] The composite motion control process of this application includes:

[0072] Command parsing: For example, after receiving the command "Mode 7: Maximum extension + 30° steering", the system first calls the kinematic model to calculate that the extension platform 42 needs to extend 2.8m and the steering motor needs to rotate 30°;

[0073] Phased implementation:

[0074] Speed ​​priority stage: The horizontal expansion hydraulic cylinder extends rapidly at 80% flow (speed 150mm / s), and the slide rail displacement error is monitored simultaneously (automatic correction is made if it exceeds 2mm);

[0075] Pressure priority stage: The main lift cylinder is fine-tuned (±5cm), and the platform levelness is compensated (error <0.5°) through the PID algorithm to ensure load balance during steering;

[0076] Accuracy priority stage: The steering motor runs in servo mode (speed 5° / s), relying on angle encoder closed-loop control, with a positioning accuracy of ±0.1°;

[0077] Safety locking: After the action is completed, the hydraulic locking valve is energized and closed (response time < 20ms), and at the same time the mechanical caliper clamps the hinge point of the telescopic rod 52 to form a hydraulic-mechanical double lock.

[0078] Example 2

[0079] The operation of a hydraulic lift flatbed trolley is as follows:

[0080] 1. Device initialization and safety self-test

[0081] 1. Start the process

[0082] Connect the power supply (AC220V / 50Hz), the controller will self-check (3s), and the touch screen will display "System Ready" after completion;

[0083] The operator selects "initialization mode" through the remote control or handle, and the hydraulic lifting flatbed cart automatically retracts all actuators to the initial position: the extension platform 42 is fully retracted (flush with the upper plate 34), the lifting mechanism 37 is lowered to the lowest height (0mm), and the steering pulley 8 is reset to the positive direction.

[0084] 2. Safety self-inspection items

[0085] Hydraulic system: detects the oil level in the tank (alarm when it is 15% below the lower limit), accumulator pressure (automatic pressure replenishment when it is less than 25MPa), and various sensor signals (fault codes are displayed when abnormal, such as P01 - pressure sensor disconnection);

[0086] Mechanical structure: Test the locking force of the self-locking limit box 9 (required ≥500N), the brake reliability of the pulley 8 (no sliding on a 3° slope), and the rotation flexibility of the telescopic rod 52 (resistance torque <5N·m).

[0087] 2. Lifting operation (taking lifting 1m as an example)

[0088] 1. Manual mode

[0089] The operator pushes the handle 7, triggering the pressure sensor signal. The controller analyzes the force and direction and outputs a PWM signal to the proportional valve.

[0090] The three-stage telescopic hydraulic cylinder 63 begins to extend and retract based on the PWM signal. The first articulated frame 31 drives the first slide bar 3 to move upward along the first slide groove 2. The second articulated frame 33 simultaneously pushes the second slide bar 36 to slide in the second slide groove 35. The upper plate 34 rises steadily.

[0091] At the same time, the displacement sensor feeds back height data in real time (automatically corrects when the error between the current value and the target value is greater than 2mm). When the vehicle reaches the 1m position, the hydraulic locking valve is automatically activated to maintain the current height.

[0092] 2. Automatic mode

[0093] By selecting the "Lift to 1m" preset mode via the remote control, the system automatically calculates the extension and retraction of the three-stage telescopic hydraulic cylinder 63 (the first stage cylinder extends 500mm, the second stage cylinder extends 300mm, and the third stage cylinder extends 200mm);

[0094] The main pump drives the hydraulic cylinder at 60% flow, and the pressure compensation valve ensures that the forces on both sides of the first articulated frame 31 are balanced (difference < 3%). After reaching the target position, the mechanical caliper synchronously locks the rotation node of the first articulated frame 31.

[0095] 3. Extension of the extension platform 42 and linkage with the support mechanism 55

[0096] 1. Extended Operation

[0097] Electric mode: Select "Extend to 2.8m" on the remote control, the double-acting hydraulic cylinder drives the slide 41 to move along the transverse groove 4, and the extension platform 42 extends synchronously;

[0098] Manual mode: The operator pushes the extension platform 42, the ball guide rail reduces friction resistance, the telescopic rod 52 automatically stretches as the extension platform 42 moves, and the angle between the first rotating column 51 and the second rotating column 54 increases from 0° to 60°, forming an equilateral triangle support.

[0099] 2. Dynamic adjustment of support force

[0100] When the extension platform 42 carries 30 tons of cargo, the stress sensor detects that the load is concentrated in the center of the upper plate 34. The controller instructs the servo motor built into the telescopic rod 52 (an electric telescopic rod 52 is optional) to fine-tune the length (±2mm) to keep the triangle vertex angle at 60°±0.5°, ensuring that the load is evenly distributed to the slide rails on both sides of the base 1.

[0101] 4. Compound Action Execution (Taking "Extension + Turn" as an Example)

[0102] 1. Command input

[0103] The remote control sends "Mode 12: Extend 2m + Turn left 45°". After analysis, the processing layer calls the kinematic model to calculate that the extension platform 42 needs to extend 2m and the steering motor needs to rotate 45°. It also generates the action sequence of the hydraulic cylinder and motor.

[0104] 2. Phased implementation

[0105] Phase 1 (extended to 1m): The hydraulic cylinder extends at a speed of 100mm / s while monitoring the distance between the steering wheel and the obstacle (via visual recognition) to ensure there is no interference;

[0106] Phase 2 (steering to 22.5°): Extension is paused, the steering motor rotates at 5° / s, and the angle encoder provides real-time feedback. When the angle reaches 22.5°, the main lift cylinder fine-tunes by 0.5cm to compensate for the platform tilt caused by steering.

[0107] The third stage (continue to extend to 2m + turn to 45°): Repeat the above steps until the compound action is completed, and finally trigger the hydraulic-mechanical double lock.

[0108] In some preferred embodiments, emergency response and safety protection are also included, specifically:

[0109] 1. Power off protection

[0110] In the event of a sudden power outage, the emergency accumulator immediately releases pressure to maintain the hydraulic locking valve closed. At the same time, the self-locking limit box 9 mechanically locks the first slide bar 3 to ensure that the platform remains stationary within 30 seconds. The operator can slowly lower the platform using a manual pump.

[0111] 2. Overload protection

[0112] When the load exceeds 50T (or the load imbalance is greater than 10%), the overload relief valve automatically relieves pressure, the hydraulic cylinder stops moving, the touch screen displays "Overload Warning", and the voice broadcasts "Please reduce the load" until the load drops to a safe range.

[0113] It should be noted that:

[0114] As shown in this embodiment, the triangle stability principle is: specifically, a rigid structure is formed by hinged connection of three sides, and the lateral shear force is converted into axial pressure by using geometric invariance, which significantly improves the structure's anti-bending ability.

[0115] The three-stage telescopic hydraulic cylinder 63 described in this embodiment adopts a multi-stage sleeve structure, which can achieve a large telescopic stroke (1.5m) while maintaining a compact size (retracted length 0.8m), and ensures lifting and lowering stability through graded telescopic sequence control.

[0116] The proportional directional valve described in this embodiment controls the flow and direction of hydraulic oil through proportional electrical signals to achieve stepless speed regulation and precise positioning of the actuator, and is a key control component of the intelligent hydraulic system.

[0117] In addition, the hydraulic lift platform cart described in this application is also suitable for other industrial application scenarios, such as:

[0118] Heavy machinery manufacturing: Used for cross-station transport of large components such as engine blocks and gearboxes. It supports smooth lifting between workbenches with a height difference of 1.5m. The 2.8m long reach allows for material transfer between multiple machine tools.

[0119] Aerospace assembly: Precision positioning capabilities (±0.5mm) are suitable for docking aircraft components, and dynamic load monitoring ensures the safe handling of easily deformable components such as wings;

[0120] Warehousing and logistics: In high-bay warehouses, height-adjustable platforms combined with long-distance extension capabilities enable efficient storage and retrieval of goods on high-bay shelves, especially palletized goods with uneven weights.

[0121] In summary, this invention, through the geometric innovation of the triangular support mechanism 55 and the control innovation of the intelligent composite hydraulic system, breaks through the stability and load-bearing capacity bottlenecks of traditional hydraulic lift platform carts, achieving systematic improvements in structural mechanics, control accuracy, and safety protection. Third-party testing has confirmed that the device's key performance indicators have reached internationally leading levels, filling a technological gap in heavy-load precision handling equipment and possessing significant engineering application value and market prospects.

[0122] Finally, it is necessary to point out here that the above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the present invention within the technical scope disclosed by the present invention should be covered within the scope of protection of the present invention.

Claims

1. A hydraulic lift flatbed cart, characterized in that: The utility model comprises a base (1), an upper plate (34) being arranged above the base (1) and parallel to the base (1) via a support mechanism (55); the upper plate (34) being able to ascend or descend relative to the base (1) via a lifting mechanism (37); The invention comprises a support mechanism (55), wherein the support mechanism (55) is a three-point linkage structure, comprising a first fixed frame (5) provided below an upper plate (34), wherein the first fixed frame (5) has a first rotating column (51) built therein, and the first rotating column (51) is rigidly connected to the upper plate (34); the support mechanism (55) comprises a movable end, wherein the movable end comprises an extension platform (42), wherein the extension platform (42) is lower than a second fixed frame (53), wherein the second fixed frame (53) has a second rotating column (54) built therein, and both ends of the telescopic rod (52) are respectively hinged to the first rotating column (51) and the second rotating column (54), thereby forming a telescopic triangular support frame.

2. A hydraulic lift flatbed cart according to claim 1, characterized in that: The lifting structure (37) includes a guide portion, and the guide portion includes a first slide groove (2) and a second slide groove (35) respectively arranged on the left and right sides of the base (2) and the upper plate (34), and the first slide groove (2) and the second slide groove (35) are arranged in parallel.

3. The hydraulic lift flatbed cart according to claim 2, characterized in that: The lifting mechanism (37) includes a first articulated frame (31) and a second articulated frame (33). One end of the first articulated frame (31) is arranged outside the first slide groove (2) of the base (1), and the other end is arranged on the upper plate (24) and is movably connected to the upper plate (24); one end of the second articulated frame (33) is arranged outside the second slide groove (35) of the upper plate (34), and the other end is arranged on the base (1) and is movably connected to the base (1).

4. The hydraulic lift flatbed cart according to claim 3, characterized in that: The lifting structure (37) includes a first slide bar (3) placed in the first slide groove (2) and a second slide bar (36) placed in the second slide groove (35); the first slide bar (3) is connected to the first hinge frame (31) on both sides, and the first hinge frame (31) is connected to the second hinge frame (33) through the fixed column (32) to form an "X-shaped" lifting connecting rod mechanism; the second slide bar (36) is connected to the second hinge frame (36) on both sides. When in use, the first slide bar (3) and the second slide bar (36) slide back and forth in the corresponding slide grooves, respectively, so that the angle between the first hinge frame (31) and the second hinge frame (33) becomes larger or smaller, thereby driving the upper plate (34) to rise or fall.

5. The hydraulic lift flatbed cart according to claim 4, characterized in that: The guide portion comprises an outer frame (61) provided on the base (1), wherein the outer frame (61) has a built-in movable block (62), wherein the movable block (63) is connected to the connecting plate (6) via a three-stage telescopic hydraulic cylinder (63), and the left and right sides of the connecting plate (6) are fixedly connected to the first articulated frame (31).

6. The hydraulic lift flatbed cart according to claim 1, characterized in that: Four sets of universal pulleys (8) are symmetrically arranged at the bottom of the base plate (1), two of which are equipped with electromagnetic brakes.

7. The hydraulic lift flatbed cart according to claim 1, characterized in that: The left and right inner walls of the upper plate (34) are provided with transverse grooves (4), and the sliding blocks (41) at the bottom of the extension platform are embedded in the transverse grooves (4).

8. The hydraulic lift flatbed cart according to claim 1, characterized in that: A self-locking limit box (9) is provided on the inner wall of the first slide groove (2), and the self-locking limit box (9) is a power-off mechanical locking device used to prevent the base (1) from sliding accidentally.

9. The hydraulic lift flatbed cart according to claim 1, characterized in that: An engineering plastic handle (7) is provided on the upper plate (24), and a pressure sensor is provided inside the engineering plastic handle (7) for performing force feedback in manual mode.

10. The hydraulic lift flatbed cart according to claim 1, characterized in that: The flat-panel pusher has a built-in intelligent control system, including an input unit, which adapts to a preset processing mode based on dynamic load data and environmental perception data collected by sensors; a processing unit, which automatically adjusts the control strategy based on the mode decision module and plans the multi-joint motion trajectory; The output unit, based on the decision of the processing unit, outputs a PWM signal as a control instruction, controls the current flowing through the load through the drive circuit, and thus controls the hydraulic valve group.

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