Fixed hydraulic dock leveler

Abstract

The invention relates to the technical field of cargo transportation and discloses a fixed hydraulic dock leveler which comprises a mounting frame, a frame is fixedly arranged on the bottom face of an inner cavity of the mounting frame, a supporting frame is fixedly arranged on the side of the upper surface of the frame, a first hinge is fixedly arranged at the top end of the supporting frame, and a table top frame is riveted to the movable end of the first hinge. A plurality of uniformly distributed reinforcing ribs are arranged on the lower surface of the tabletop frame, a tabletop plate is fixedly arranged on the upper surface of the tabletop frame, and the tabletop plate is a T8 checkered plate; the hydraulic adjusting mechanism is used for adjusting the angles of the table top frame and the table top plate, and the hydraulic adjusting mechanism is fixedly arranged on the bottom surface of the inner cavity of the mounting frame; the positioning mechanism is used for connecting the table top frame and the truck carriage together, and the positioning mechanism is fixedly arranged at the end, away from the first hinge, of the table top frame; and the effect of stably connecting with the boxcar is achieved.

Description

Technical Field

[0001] This invention relates to the field of cargo transportation technology, specifically a fixed hydraulic loading ramp. Background Technology

[0002] Hydraulic loading ramps are indispensable key equipment in modern logistics loading and unloading processes. They are mainly used to connect truck beds and warehouse loading and unloading platforms to compensate for the height difference between the two, enabling forklifts, handcarts, and other loading and unloading tools to pass quickly and safely. This equipment typically consists of core components such as a base, ramps, a power unit, and a hydraulic system. Its working principle is that an electric motor drives a hydraulic pump, converting mechanical energy into hydraulic energy to drive the cylinders to extend and retract, thereby smoothly and precisely controlling the raising and lowering of the ramps. During operation, the ramps can be flexibly adjusted in tilt angle, and the front overlapping lip plate can firmly fit against the edge of the truck bed, forming a stable transition passage. Some models also have ramp adjustment, safety guard edges, and anti-slip panels to accommodate different vehicle types and ensure operational safety. If a hydraulic loading ramp becomes unstable during lifting, it will cause a series of serious consequences. First, operational safety is directly threatened. Sudden subsidence or abnormal swaying of the ramp surface can cause forklifts or handling equipment to become unbalanced, easily leading to serious accidents such as equipment tipping over and goods falling, posing a significant risk of personal injury to on-site personnel. Second, loading and unloading efficiency is significantly reduced. Unstable lifting movements force operators to be more cautious and make repeated adjustments, making it impossible to achieve a fast and smooth work cycle, thus delaying the progress of the entire logistics process. Furthermore, the equipment itself and the goods it carries will be subjected to additional impacts and vibrations. Summary of the Invention

[0003] To achieve the above objectives, the present invention provides the following technical solution: a fixed hydraulic loading ramp, comprising a mounting frame, a frame fixedly mounted on the bottom surface of the inner cavity of the mounting frame, a support frame fixedly mounted on the side of the upper surface of the frame, a first hinge fixedly mounted on the top of the support frame, a platform frame riveted to the movable end of the first hinge, a plurality of evenly distributed reinforcing ribs provided on the lower surface of the platform frame, and a platform panel fixedly mounted on the upper surface of the platform frame, the platform panel being a T8 patterned plate; A hydraulic adjustment mechanism is used to adjust the angle between the table frame and the table panel. The hydraulic adjustment mechanism is fixed to the bottom surface of the inner cavity of the mounting frame. A positioning mechanism for connecting the platform frame to the truck bed, the positioning mechanism being fixed at the end of the platform frame away from the first hinge; A dustproof mechanism is used to prevent dust and impurities from entering the inner cavity of the mounting frame. The dustproof mechanism is symmetrically fixed on the outer side of the table frame. The hydraulic adjustment mechanism includes a cylinder, and a connecting frame is fixedly provided on the outer surface of the cylinder. A limit frame is connected to the outer surface of the connecting frame through a rolling bearing. The limit frame is fixed to the bottom surface of the inner cavity of the mounting frame.

[0004] Preferably, a fixed frame is fixedly connected to the lower surface of the table frame, a pressing rod is fixedly provided at the movable end of the oil cylinder, a rotating column is fixedly provided at the end of the pressing rod, and the two ends of the rotating column are connected to limit rings through rolling bearings. The limit rings are fixed on the top surface of the inner cavity of the fixed frame.

[0005] Preferably, the hydraulic adjustment mechanism further includes a hydraulic pump, which is fixed on the bottom surface of the inner cavity of the mounting frame. The output end of the hydraulic pump is fixed with a first diverter pipe. The two outlets of the first diverter pipe are respectively fixed with a first control valve and a second control valve. The end of the first control valve away from the first diverter pipe is fixed with a first hose, and the end of the first hose is fixed with the oil inlet of the cylinder.

[0006] Preferably, a second diversion pipe is fixed at the end of the second control valve away from the first diversion pipe, a second flexible hose is fixed at the end of the second diversion pipe, a limiting pipe is fixed at the end of the second flexible hose, the limiting pipe is fixed on the lower surface of the table frame, a piston is slidably connected to the inner cavity of the limiting pipe, a moving rod is fixed on the outer surface of the piston, and a squeezing head is fixed at one end of the moving rod that passes through the limiting pipe.

[0007] Preferably, the positioning mechanism includes a fixed plate, which is fixedly disposed on the side of the table frame away from the first hinge. The outer surface of the fixed plate is provided with a positioning hole. The extrusion head is slidably connected to the positioning hole on the outer surface of the fixed plate. A second hinge is fixedly disposed on the outer surface of the fixed plate. A tongue plate is fixedly disposed at the movable end of the second hinge. The surface of the tongue plate is provided with a plurality of anti-slip grooves. The extrusion head is extruded and adapted to the outer surface of the tongue plate.

[0008] Preferably, an anti-slip rubber ring is fixed on the side of the tongue plate away from the anti-slip groove. The anti-slip rubber ring is semi-cylindrical. A groove is opened on the surface of the tongue plate near the anti-slip rubber ring. A damper is fixed on the upper surface of the frame. A pressing block is fixed on the movable end of the damper. The pressing block is pressed and adapted to the inner wall of the anti-slip rubber ring.

[0009] Preferably, the dustproof mechanism includes a side plate, which is fixed to the outer side of the table frame. A limiting post is fixed to the outer surface of the side plate. Two circular grooves are formed on the outer surface of the limiting post, and several balls are slidably connected to the circular grooves formed on the outer surface of the limiting post. A first rotating ring is rotatably connected to the outer surface of the limiting post, and the balls are frictionally adapted to the inner wall of the first rotating ring.

[0010] Preferably, a first baffle is fixedly provided on the outer surface of the first rotating ring, and a first arc-shaped groove is provided on the outer surface of the first baffle away from the first rotating ring. A first stop block is fixedly provided on the side of the side plate near the first arc-shaped groove, and the first stop block is slidably connected to the first arc-shaped groove.

[0011] Preferably, a second rotating ring is rotatably connected to the outer surface of the limiting post, the ball bearing is frictionally adapted to the inner ring of the second rotating ring, a second baffle is fixedly provided on the outer surface of the second rotating ring, a second arc-shaped groove is provided on the outer surface of the second baffle away from the second rotating ring, a second stop block is provided on the outer surface of the first baffle, the second stop block is slidably connected to the second arc-shaped groove, a support plate is fixedly provided on the bottom surface of the inner cavity of the mounting frame, a compression pad is fixedly provided on the top of the support plate, and the first baffle and the second baffle are compressively adapted to the upper surface of the compression pad.

[0012] This invention provides a fixed hydraulic loading ramp. It has the following advantages: I. This fixed hydraulic loading ramp, through the installation frame, frame, support frame, first hinge, platform frame, and platform panel, together constitutes the main load-bearing and rotation structure of the loading ramp. The installation frame serves as the installation base and foundation of the entire device, the frame provides secondary reinforcement support, the support frame transfers the load to the installation frame, the first hinge serves as the rotation fulcrum of the platform, allowing it to make large pitch movements, the platform frame is the core load-bearing frame, and the reinforcing ribs on its lower surface greatly enhance its bending and torsional stiffness, while the T8 patterned steel plate platform panel on the upper surface provides a high-friction, anti-slip, and wear-resistant working surface, ensuring the safe passage of forklifts, handcarts, and other loading and unloading equipment.

[0013] Second, this fixed hydraulic loading ramp, through the setting of a hydraulic adjustment mechanism, is the core power and execution system for driving the platform to rise and fall, and realizing height adjustment to accommodate different car heights. It can output a powerful and stable thrust, and through a precise control system, it can realize stepless adjustment and self-locking of the platform angle, which is the key to realizing automated and labor-saving operation of modern loading ramps.

[0014] Third, the fixed hydraulic loading ramp, through the setting of a positioning mechanism, is a key safety mechanism to ensure a stable and reliable connection between the loading ramp and the truck bed. It uses mechanical locking or hydraulic clamping to firmly lock the free end of the ramp to the edge of the truck bed, preventing relative displacement or separation of the ramp and the truck bed during loading and unloading operations, thus eliminating the danger of "ramp-truck separation".

[0015] IV. This fixed hydraulic loading ramp, with its dustproof mechanism, is a protective system that safeguards precision components such as the hydraulic adjustment mechanism from external environmental damage. It effectively prevents rainwater, dust, and debris from entering the mounting frame, preventing rust, blockage, or damage to the cylinders and hydraulic lines, thus extending the service life of the equipment. It is particularly suitable for outdoor or dusty working environments.

[0016] V. This fixed hydraulic loading ramp, through the setting of a fixed plate, positioning holes, a second hinge, and a tongue plate, constitutes the main frame of the positioning mechanism and the rotating locking tongue. The fixed plate provides a mounting base for the entire mechanism, the positioning holes provide precise guidance for the movement of the pressing head, the second hinge is the rotation fulcrum of the tongue plate, and the tongue plate is a movable locking tongue, one end of which is connected by the hinge, and the other end can rotate up and down around the hinge. The anti-slip grooves on its surface can increase the friction. When the pressing head extends under hydraulic drive and moves along the positioning hole, it will press a specific part of the tongue plate, forcing the tongue plate to rotate upward around the hinge, so that its free end protrudes and presses against the edge of the carriage, forming a reliable mechanical connection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of a fixed hydraulic loading ramp according to the present invention; Figure 2 This is a schematic diagram of the unfolded structure of a fixed hydraulic loading ramp according to the present invention; Figure 3 This is a partial structural schematic diagram of a fixed hydraulic loading ramp according to the present invention; Figure 4 This is a schematic diagram of the hydraulic adjustment mechanism of the present invention; Figure 5 This is a partial structural diagram of the hydraulic adjustment mechanism of the present invention; Figure 6 This is a partial cross-sectional structural diagram of the hydraulic adjustment mechanism of the present invention; Figure 7 This is a schematic diagram of the positioning mechanism structure of the present invention; Figure 8 This is a partial structural diagram of the positioning mechanism of the present invention; Figure 9 This is a schematic diagram of the dustproof mechanism structure of the present invention; Figure 10 This is a schematic diagram of the unfolded structure of the dustproof mechanism of the present invention.

[0018] In the diagram: 1. Mounting frame; 2. Frame; 3. Support frame; 4. First hinge; 5. Tabletop frame; 6. Tabletop panel; 7. Hydraulic adjustment mechanism; 71. Hydraulic pump; 72. First diverter pipe; 73. First control valve; 74. Limiting frame; 75. Connecting bracket; 76. Oil cylinder; 77. First hose; 78. Extrusion rod; 79. Rotating column; 710. Limiting ring; 711. Second control valve; 712. Second diverter pipe; 713. Second hose; 714. Limiting pipe; 715. Piston; 716. Moving rod; 717. Extrusion head; 8. Positioning mechanism; 81. Damping; 82. Pressing block; 83. Fixing plate; 84. Second hinge; 85. Tongue plate; 86. Anti-slip rubber ring; 87. Positioning hole; 9. Dustproof mechanism; 91. Side plate; 92. Limiting post; 93. Ball bearing; 94. First baffle; 95. First rotating ring; 96. First arc groove; 97. First stop block; 98. Second stop block; 99. Second baffle; 910. Second rotating ring; 911. Second arc groove; 10. Support plate; 11. Extrusion pad; 12. Fixing frame. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0020] like Figures 1-10 As shown, the present invention provides a technical solution: a fixed hydraulic loading ramp, including a mounting frame 1, a frame 2 fixedly mounted on the bottom surface of the inner cavity of the mounting frame 1, a support frame 3 fixedly mounted on the side of the upper surface of the frame 2, a first hinge 4 fixedly mounted on the top of the support frame 3, a platform frame 5 riveted to the movable end of the first hinge 4, a plurality of evenly distributed reinforcing ribs provided on the lower surface of the platform frame 5, and a platform panel 6 fixedly mounted on the upper surface of the platform frame 5, the platform panel 6 being a T8 patterned plate. The loading ramp consists of a mounting frame 1, a frame 2, a support frame 3, a first hinge 4, a platform frame 5, and a platform panel 6. The mounting frame 1 serves as the mounting base and foundation for the entire device. The frame 2 provides secondary reinforcement support. The support frame 3 transfers the load to the mounting frame 1. The first hinge 4 serves as the rotation fulcrum of the platform, allowing it to make large pitch movements. The platform frame 5 is the core load-bearing frame. The reinforcing ribs on its lower surface greatly enhance its bending and torsional stiffness. The T8 patterned steel plate platform panel 6 on the upper surface provides a high-friction, anti-slip, and wear-resistant working surface, ensuring the safe passage of forklifts, handcarts, and other loading and unloading equipment. The hydraulic adjustment mechanism 7 is used to adjust the angle of the platform frame 5 and the platform panel 6. The hydraulic adjustment mechanism 7 is fixed to the bottom surface of the inner cavity of the mounting frame 1. The hydraulic adjustment mechanism 7 is the core power and execution system for driving the platform to rise and fall and realizing height adjustment to accommodate different car heights. It can output a strong and stable thrust, and realize stepless adjustment and self-locking of the platform angle through a precise control system. It is the key to realizing the automation and labor-saving operation of modern loading ramps. The positioning mechanism 8 connects the platform frame 5 to the truck bed. The positioning mechanism 8 is fixed at the end of the platform frame 5 furthest from the first hinge 4. The positioning mechanism 8 is a key safety feature ensuring a stable and reliable connection between the loading ramp and the truck bed. It securely locks the free end of the platform to the edge of the truck bed using mechanical locking or hydraulic clamping, preventing relative displacement or detachment of the platform and truck bed during loading and unloading operations, thus eliminating the danger of "bridge-truck separation." Dustproof mechanism 9 is used to prevent dust and impurities from entering the inner cavity of the mounting frame 1. The dustproof mechanism 9 is symmetrically fixed on the outer side of the table frame 5. By setting up the dustproof mechanism 9, a protective system is provided to protect precision components such as the hydraulic adjustment mechanism 7 from external environmental damage. It can effectively block rainwater, dust, debris, etc. from entering the interior of the mounting frame 1, prevent the oil cylinder 76, hydraulic pipelines, etc. from rusting, clogging or damage, and extend the service life of the equipment. It is especially suitable for outdoor or dusty working environments. The hydraulic adjustment mechanism 7 includes a cylinder 76. A connecting frame 75 is fixed to the outer surface of the cylinder 76. A limit frame 74 is connected to the outer surface of the connecting frame 75 via a rolling bearing. The limit frame 74 is fixed to the bottom surface of the inner cavity of the mounting frame 1. By setting the cylinder 76, the connecting frame 75, and the limit frame 74, the linear power output and swing support unit of the hydraulic adjustment mechanism 7 is formed. The cylinder 76 is the actuator that generates linear push / pull force. The connecting frame 75 is connected to the limit frame 74 via a rolling bearing, allowing the cylinder body of the cylinder 76 to swing within a certain angle to compensate for the dynamic change of the connection angle between the cylinder 76 and the platform during the lifting and lowering of the platform, avoid generating lateral force, and extend the sealing life of the cylinder 76.

[0021] A fixed frame 12 is fixedly connected to the lower surface of the platform frame 5. A pressing rod 78 is fixedly mounted on the movable end of the hydraulic cylinder 76, and a rotating column 79 is fixedly mounted on the end of the pressing rod 78. The two ends of the rotating column 79 are connected to a limit ring 710 through rolling bearings. The limit ring 710 is fixed on the top surface of the inner cavity of the fixed frame 12. By setting up the fixed frame 12, pressing rod 78, rotating column 79 and limit ring 710, a rigid transmission and flexible connection hub for hydraulic power from the hydraulic cylinder 76 to the platform frame 5 is formed. The fixed frame 12 provides a solid support for force transmission. The pressing rod 78 is an extension of the piston rod. The rotating column 79 is installed in the limit ring 710 through rolling bearings on both sides. This design makes the piston rod of the hydraulic cylinder 76 and the platform frame 5 form a hinge point that can rotate freely around the axis, ensuring that the thrust of the hydraulic cylinder 76 is always effectively transmitted along its axis. At the same time, it allows the platform to deflect at an angle with the hydraulic cylinder 76 during the lifting process, eliminating stress concentration and wear caused by rigid connection.

[0022] The hydraulic adjustment mechanism 7 also includes a hydraulic pump 71, which is fixed on the bottom surface of the inner cavity of the mounting frame 1. The output end of the hydraulic pump 71 is fixed with a first diverter pipe 72. The two outlets of the first diverter pipe 72 are respectively fixed with a first control valve 73 and a second control valve 711. The end of the first control valve 73 away from the first diverter pipe 72 is fixed with a first hose 77, and the end of the first hose 77 is fixed with the oil inlet of the cylinder 76. By setting up a hydraulic pump 71, a first diverter pipe 72, a first control valve 73, and a second control valve 711, the power source and main control valve group of the entire hydraulic system are constituted. The hydraulic pump 71 provides high-pressure hydraulic oil, the first diverter pipe 72 divides the oil circuit into two, the first control valve 73 is a three-position four-way solenoid directional valve that specifically controls the oil circuit leading to the main lifting cylinder 76, and is used to precisely control the rise, fall, and stop lock of the platform. The second control valve 711 is used to control the on / off of the oil circuit leading to the positioning mechanism 8, so as to realize the independent or coordinated control of the platform lifting and positioning actions, which reflects the integrated and modular design of the system.

[0023] The second control valve 711 has a second diversion pipe 712 fixed at one end away from the first diversion pipe 72. The ends of the second diversion pipe 712 are all fixed with second hoses 713. The ends of the second hoses 713 are fixed with limiting pipes 714. The limiting pipes 714 are fixed on the lower surface of the table frame 5. A piston 715 is slidably connected to the inner cavity of the limiting pipe 714. A moving rod 716 is fixed on the outer surface of the piston 715. A squeezing head 717 is fixed at one end of the moving rod 716 that passes through the limiting pipe 714. By setting up a second diversion pipe 712, a second hose 713, a limiting pipe 714, a piston 715, a moving rod 716, and a pressing head 717, a hydraulic actuator unit for driving the positioning mechanism 8 is formed. The second diversion pipe 712 distributes pressurized oil to two symmetrically arranged hydraulic cylinders, which are composed of a limiting pipe 714, a piston 715, etc. The second hose 713 adapts to the change in pipe length caused by the lifting of the platform. The limiting pipe 714 serves as the cylinder barrel of the hydraulic cylinder. The piston 715 moves under the drive of pressurized oil. The moving rod 716 transmits the linear motion of the piston 715. The pressing head 717 at the end serves as the execution terminal. Its shape is optimized for directly pushing or pressing the positioning mechanism 8 to achieve mechanical locking. This design efficiently converts hydraulic power into the mechanical action required for positioning and locking.

[0024] The positioning mechanism 8 includes a fixed plate 83, which is fixed on the side of the table frame 5 away from the first hinge 4. The outer surface of the fixed plate 83 is provided with a positioning hole 87. The extrusion head 717 is slidably connected to the positioning hole 87 on the outer surface of the fixed plate 83. The outer surface of the fixed plate 83 is provided with a second hinge 84. The movable end of the second hinge 84 is provided with a tongue plate 85. The surface of the tongue plate 85 is provided with several anti-slip grooves. The extrusion head 717 is extruded and adapted to the outer surface of the tongue plate 85. The positioning mechanism 8 is formed by setting a fixed plate 83, a positioning hole 87, a second hinge 84, and a tongue plate 85. The fixed plate 83 provides a mounting base for the entire mechanism, the positioning hole 87 provides precise guidance for the movement of the pressing head 717, the second hinge 84 is the rotation fulcrum of the tongue plate 85, and the tongue plate 85 is a movable locking tongue. One end of the tongue plate 85 is connected by a hinge, and the free end of the other end can be rotated up and down around the hinge. The anti-slip grooves on its surface can increase the friction. When the pressing head 717 extends under hydraulic drive and moves along the positioning hole 87, it will press a specific part of the tongue plate 85, forcing the tongue plate 85 to rotate upward around the hinge, so that its free end protrudes and presses against the edge of the carriage, forming a reliable mechanical connection.

[0025] An anti-slip rubber ring 86 is fixed on the side of the tongue plate 85 away from the anti-slip groove. The anti-slip rubber ring 86 is semi-cylindrical. A hole groove is opened on the side of the tongue plate 85 near the anti-slip rubber ring 86. A damper 81 is fixed on the upper surface of the frame 2. A pressing block 82 is fixed on the movable end of the damper 81. The pressing block 82 is pressed and matched with the inner wall of the anti-slip rubber ring 86. By setting up anti-slip rubber ring 86, slots, damping 81, and compression block 82, an auxiliary buffer and enhanced locking system is formed after positioning and locking. The anti-slip rubber ring 86 is made of highly elastic wear-resistant rubber, and its semi-cylindrical structure forms a "groove". When the tongue plate 85 is not in the working state, the compression block 82 of the damping 81 installed on the frame 2 extends into and presses into the "groove" on the inner wall of the anti-slip rubber ring 86. The damping 81 itself provides a certain buffer and vibration absorption effect, while the interference fit between the compression block 82 and the rubber ring forms an additional mechanical lock, effectively preventing the tongue plate 85 from accidentally rebounding and unlocking under vehicle vibration or impact, greatly enhancing the reliability and safety of locking.

[0026] The dustproof mechanism 9 includes a side plate 91, which is fixed to the outer side of the table frame 5. A limiting post 92 is fixed on the outer surface of the side plate 91. Two circular grooves are opened on the outer surface of the limiting post 92, and several balls 93 are slidably connected to the circular grooves on the outer surface of the limiting post 92. A first rotating ring 95 is rotatably connected to the outer surface of the limiting post 92, and the balls 93 are frictionally adapted to the inner wall of the first rotating ring 95. By setting up a side plate 91, a limiting post 92, a ball bearing 93, and a first rotating ring 95, a fixed base and a first-stage rotary sealing unit for the dustproof mechanism 9 are formed. The side plate 91 is connected to the side of the table frame 5 and moves with it. The limiting post 92 is fixed on it. The circular groove on its surface and the ball bearing 93 inside form a low-friction bearing structure. The first rotating ring 95 can rotate flexibly around the limiting post 92 with the support of the ball bearing 93. This design allows the baffle connected to the first rotating ring 95 to automatically adjust its angle as the table rises and falls, while always maintaining contact with the fixed components below, forming the first line of defense for dynamic sealing.

[0027] A first baffle 94 is fixedly mounted on the outer surface of the first rotating ring 95. A first arc-shaped groove 96 is formed on the outer surface of the first baffle 94 away from the first rotating ring 95. A first stop 97 is fixedly mounted on the side plate 91 near the first arc-shaped groove 96. The first stop 97 is slidably connected to the first arc-shaped groove 96. By setting the first baffle 94, the first arc-shaped groove 96 and the first stop 97, a limiting and angle compensation mechanism for the first-stage dynamic seal is formed. The first baffle 94 is a rigid plate that directly blocks dust. The first arc-shaped groove 96 on it and the first stop 97 fixed on the side plate 91 form a sliding pair. When the platform is raised and lowered, it drives the side plate 91 and the first stop 97 to move. The first stop 97 slides in the first arc-shaped groove 96. This limits the maximum rotation angle of the first rotating ring 95 and the first baffle 94 to prevent them from overturning and failing. On the other hand, it allows the first baffle 94 to adaptively adjust its tilt angle under the action of gravity or contact force to ensure that its lower edge always keeps in contact with the pressing pad 11 of the lower component.

[0028] The outer surface of the limiting post 92 is rotatably connected to the second rotating ring 910. The ball 93 is frictionally adapted to the inner ring of the second rotating ring 910. The outer surface of the second rotating ring 910 is fixedly provided with a second baffle 99. The outer surface of the second baffle 99 away from the second rotating ring 910 is provided with a second arc-shaped groove 911. The outer surface of the first baffle 94 is provided with a second stop 98. The second stop 98 is slidably connected to the second arc-shaped groove 911. The bottom surface of the inner cavity of the mounting frame 1 is fixedly provided with a support plate 10. The top of the support plate 10 is fixedly provided with a compression pad 11. The first baffle 94 and the second baffle 99 are compressively adapted to the upper surface of the compression pad 11. By setting a second rotating ring 910, a second baffle 99, a second arc-shaped groove 911, a second stop 98, a support plate 10, and a compression pad 11, a double-layered, linked dynamic sealing system is formed. The second rotating ring 910 is also mounted on the limiting post 92 by ball bearings 93 and can rotate independently of the first rotating ring 95. The second baffle 99 and the first baffle 94 on it are linked by the sliding pair of the second stop 98 and the second arc-shaped groove 911. This double-layer baffle design expands the sealing coverage area, especially adapting to the large gap changes generated when the table is raised and lowered within a large angle range. The support plate 10 and the wear-resistant rubber of the flexible compression pad 11 on its top are fixed to the bottom surface of the mounting frame 1. No matter what height the table is at, the lower edges of the first baffle 94 and the second baffle 99 will be pressed tightly on the compression pad 11 under the action of gravity and the linkage mechanism, forming a tight sliding contact seal, effectively preventing external impurities from entering the interior of the mounting frame 1, protecting the hydraulic components, and at the same time, the frictional resistance is small and does not affect the table's raising and lowering action.

[0029] Working Principle: The loading ramp is installed at the edge of the logistics platform. Its mounting frame 1 is fixed to the platform foundation by pre-embedded or high-strength fasteners. When the truck reverses and approaches the platform, the loading ramp is in its initial horizontal or slightly tilted retracted position. The operator guides the truck so that the rear door of its cargo compartment is aligned with the free end area of ​​the loading ramp platform frame 5. The operator starts the hydraulic system. The hydraulic pump 71 operates, drawing oil from the tank and generating a high-pressure oil flow. This high-pressure oil flows through the first branch pipe 72 to the first control valve 73. The operator operates the first control valve 73 to the "raise" position. The high-pressure oil enters the rodless chamber of the main lifting cylinder 76 through the first hose 77, pushing the piston rod to extend through the connecting parts such as the compression rod 78 and the rotating column 79. The thrust of the cylinder 76 acts on the platform frame 5 through the hinge point between the rotating column 79 and the fixed frame 12. Since the rear end of the platform frame 5 is connected to the support frame 3 via the first hinge 4, forming a fixed fulcrum, under the thrust of the cylinder 76, the entire platform, including the platform frame 5 and the platform panel 6, smoothly tilts upwards around the axis of the first hinge 4. The cylinder body of the cylinder 76 is connected to the bearings of the connecting frame 75 and the limiting frame 74, allowing for adaptive swinging to ensure pure force application. The operator observes and controls the first control valve 73 to match the slope of the upper surface of the platform 6 with the height and slope of the truck bed floor, ultimately creating a smooth transition between the leading edge of the platform 6 and the edge of the truck bed floor. The T8 patterned steel platform 6 provides a non-slip working surface. Once the platform is raised to approximately aligned with the carriage, a safety lock is required. The operator operates the second control valve 711 to the "locked" position. High-pressure oil from the hydraulic pump 71 flows through the first branch pipe 72, the second control valve 711, the second branch pipe 712, and the second hose 713 into two symmetrically installed limiting pipes 714 located under the platform. The high-pressure oil pushes the piston 715 within the limiting pipe 714, causing the moving rod 716 and its end-mounted pressing head 717 to extend outwards. The pressing head 717 slides along the positioning hole 87 on the fixed plate 83, precisely pressing against a specific slope or groove on the back of the tongue plate 85.

[0030] One end of the tongue plate 85 is connected to the fixed plate 83 via the second hinge 84. Under the thrust of the extrusion head 717, the tongue plate 85 rotates upward around the second hinge 84, its front end protrudes upward and crosses the front edge of the platform, and finally rests firmly on the edge of the truck bed, realizing the mechanical connection between the platform and the truck bed.

[0031] Simultaneously, when the tongue plate 85 is flipped to a working position that is approximately vertical or at a certain angle, the semi-cylindrical anti-slip rubber ring 86 on its back also comes into position. The damper 81 provides cushioning, while the interference fit between the compression block 82 and the rubber ring forms a reliable anti-reverse lock, preventing the tongue plate 85 from unexpectedly rebounding due to vehicle vibration, thus achieving double protection.

[0032] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A fixed hydraulic loading ramp, characterized in that, include: Mounting frame (1), the bottom surface of the inner cavity of the mounting frame (1) is fixed with a frame (2), the side of the upper surface of the frame (2) is fixed with a support frame (3), the top of the support frame (3) is fixed with a first hinge (4), the movable end of the first hinge (4) is riveted with a table frame (5), the lower surface of the table frame (5) is provided with a number of evenly distributed reinforcing ribs, the upper surface of the table frame (5) is fixed with a table panel (6), the table panel (6) is a T8 patterned plate; A hydraulic adjustment mechanism (7) is used to adjust the angle of the table frame (5) and the table panel (6). The hydraulic adjustment mechanism (7) is fixed to the bottom surface of the inner cavity of the mounting frame (1). Positioning mechanism (8) for connecting table frame (5) to truck body, the positioning mechanism (8) being fixed at one end of table frame (5) away from the first hinge (4); Dustproof mechanism (9), which is used to prevent dust and impurities from entering the inner cavity of the mounting frame (1), the dustproof mechanism (9) is symmetrically fixed on the outer side of the table frame (5); The hydraulic adjustment mechanism (7) includes a cylinder (76), and a connecting frame (75) is fixed on the outer surface of the cylinder (76). The outer surface of the connecting frame (75) is connected to a limit frame (74) through a rolling bearing. The limit frame (74) is fixed on the bottom surface of the inner cavity of the mounting frame (1).

2. A fixed hydraulic loading ramp according to claim 1, characterized in that: A fixed frame (12) is fixedly connected to the lower surface of the table frame (5). A pressing rod (78) is fixedly provided at the movable end of the oil cylinder (76). A rotating column (79) is fixedly provided at the end of the pressing rod (78). The two ends of the rotating column (79) are connected to a limit ring (710) through a rolling bearing. The limit ring (710) is fixed on the top surface of the inner cavity of the fixed frame (12).

3. A fixed hydraulic loading ramp according to claim 1, characterized in that: The hydraulic adjustment mechanism (7) also includes a hydraulic pump (71), which is fixed on the bottom surface of the inner cavity of the mounting frame (1). The output end of the hydraulic pump (71) is fixed with a first diverter pipe (72). The two outlets of the first diverter pipe (72) are respectively fixed with a first control valve (73) and a second control valve (711). The end of the first control valve (73) away from the first diverter pipe (72) is fixed with a first hose (77). The end of the first hose (77) is fixed at the oil inlet of the oil cylinder (76).

4. A fixed hydraulic loading ramp according to claim 3, characterized in that: The second control valve (711) is fixed with a second diversion pipe (712) at one end away from the first diversion pipe (72). The ends of the second diversion pipe (712) are all fixed with a second hose (713). The ends of the second hose (713) are fixed with a limiting pipe (714). The limiting pipe (714) is fixed on the lower surface of the table frame (5). A piston (715) is slidably connected to the inner cavity of the limiting pipe (714). A moving rod (716) is fixed on the outer surface of the piston (715). A squeezing head (717) is fixed at one end of the moving rod (716) that passes through the limiting pipe (714).

5. A fixed hydraulic loading ramp according to claim 4, characterized in that: The positioning mechanism (8) includes a fixing plate (83), which is fixed on the side of the table frame (5) away from the first hinge (4). The outer surface of the fixing plate (83) is provided with a positioning hole (87). The extrusion head (717) is slidably connected to the positioning hole (87) on the outer surface of the fixing plate (83). The outer surface of the fixing plate (83) is provided with a second hinge (84). The movable end of the second hinge (84) is provided with a tongue plate (85). The surface of the tongue plate (85) is provided with several anti-slip grooves. The extrusion head (717) is extruded and adapted to the outer surface of the tongue plate (85).

6. A fixed hydraulic loading ramp according to claim 5, characterized in that: An anti-slip rubber ring (86) is fixed on the side of the tongue plate (85) away from the anti-slip groove. The anti-slip rubber ring (86) is semi-cylindrical. A hole groove is opened on the side of the tongue plate (85) near the anti-slip rubber ring (86). A damper (81) is fixed on the upper surface of the frame (2). A pressing block (82) is fixed on the movable end of the damper (81). The pressing block (82) is pressed and adapted to the inner wall of the anti-slip rubber ring (86).

7. A fixed hydraulic loading ramp according to claim 1, characterized in that: The dustproof mechanism (9) includes a side plate (91), which is fixed on the outer side of the table frame (5). A limiting post (92) is fixed on the outer surface of the side plate (91). Two circular grooves are opened on the outer surface of the limiting post (92), and several balls (93) are slidably connected to the circular grooves on the outer surface of the limiting post (92). A first rotating ring (95) is rotatably connected to the outer surface of the limiting post (92), and the balls (93) are rubbed against the inner wall of the first rotating ring (95).

8. A fixed hydraulic loading ramp according to claim 7, characterized in that: A first baffle (94) is fixedly provided on the outer surface of the first rotating ring (95). A first arc-shaped groove (96) is provided on the outer surface of the first baffle (94) away from the first rotating ring (95). A first stop block (97) is fixedly provided on the side plate (91) near the first arc-shaped groove (96). The first stop block (97) is slidably connected to the first arc-shaped groove (96).

9. A fixed hydraulic loading ramp according to claim 8, characterized in that: The outer surface of the limiting post (92) is rotatably connected to a second rotating ring (910). The ball (93) is frictionally adapted to the inner ring of the second rotating ring (910). A second baffle (99) is fixed on the outer surface of the second rotating ring (910). A second arc-shaped groove (911) is opened on the side of the outer surface of the second baffle (99) away from the second rotating ring (910). A second stop block (98) is opened on the outer surface of the first baffle (94). The second stop block (98) is slidably connected to the second arc-shaped groove (911). A support plate (10) is fixed on the bottom surface of the inner cavity of the mounting frame (1). A compression pad (11) is fixed on the top of the support plate (10). The first baffle (94) and the second baffle (99) are compressively adapted to the upper surface of the compression pad (11).

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