Submarine fork lift truck

Abstract

The utility model discloses a kind of lurking forklifts, it is related to logistics warehousing technical field, including flat car frame, the car frame includes car frame main body and can be mounted in the fork assembly of car frame main body, the fork assembly includes support mesa, fork chassis and scissor jacking mechanism, the support mesa is connected in the fork chassis by the scissor jacking mechanism, the scissor jacking mechanism includes the scissor foot and screw nut structure of being connected, the support mesa can be lifted, the car frame and the fork assembly are equipped with walking mechanism, the car frame main body and the fork assembly are separable structure.The utility model provides a kind of lurking forklift, solves the technical problem that traditional forklift is difficult to operate in narrow space, especially low type carrier handling exists blind area.

Description

Technical Field

[0001] This utility model relates to the field of logistics and warehousing technology, specifically to a stealthy forklift. Background Technology

[0002] In the process of modern warehousing and logistics automation, the demand for efficient, flexible, and adaptable small handling equipment is growing. Traditional forklifts or manual handling vehicles often face many limitations when handling specific types of goods, such as A-frame pallets, low-profile racks, and cage carts commonly used in warehousing. Ordinary forklifts are bulky and difficult to maneuver flexibly in narrow aisles or under racks, especially for low-profile racks with height restrictions, where the fork lifting height and vehicle height often become bottlenecks. Manual handling vehicles are inefficient and difficult to integrate into automation. To address these pain points, there is an urgent need for a fully automated handling solution that is highly mobile, can reach under goods, and can efficiently pick up and lift goods in limited spaces. Specifically, this solution needs to break through the limitations of traditional fork structures, be able to penetrate under target goods with a small self-compression height, and have a large effective lifting stroke to adapt to the needs of low-profile racks or pallets from low positions to high handling heights. Utility Model Content

[0003] Technical problem to be solved by the utility model

[0004] The technical problem to be solved by this utility model is to provide a hidden forklift that solves the problem of traditional forklifts having difficulty operating in narrow spaces, especially the problem of blind spots when handling low-profile vehicles.

[0005] Technical solution

[0006] To solve the above problems, the technical solution provided by this utility model is as follows:

[0007] A stealthy forklift, characterized in that it includes a flat frame, the frame including a frame body and a fork assembly that can be mounted on the frame body, the fork assembly including a support platform, a fork chassis and a scissor lift mechanism, the support platform being connected to the fork chassis via the scissor lift mechanism, the scissor lift mechanism including connected scissor legs and a lead screw and nut structure, the support platform being liftable, both the frame and the fork assembly having a traveling mechanism, and the frame body and the fork assembly being separable structures.

[0008] A flat frame reduces the overall height of the forklift. The frame body forms the main load-bearing structure and moving platform of the forklift. The fork assembly, which can be mounted on the frame body, is a dedicated module providing the ability to pick up, lift, and carry goods. The support platform directly contacts and supports the goods. The fork chassis serves as the base for the fork assembly. The scissor lift mechanism enables a large-stroke lifting and lowering of the support platform relative to the fork chassis. Scissor legs form the cross linkage of the scissor mechanism. The screw and nut structure provides the linear motion and power to drive the extension and retraction of the scissor mechanism. Both the frame and fork assembly have a travel mechanism, providing independent movement capabilities for the frame body and fork assembly. The frame body and fork assembly are detachable, allowing the fork assembly to be loaded and unloaded from the frame body.

[0009] Optionally, the frame body is provided with a fork slot for accommodating the fork assembly, and the fork assembly reciprocates within the fork slot.

[0010] The design, which features fork slots on the chassis to accommodate the fork assembly, allowing the fork assembly to reciprocate within these slots, provides physical space, precise motion guides, and force transmission paths. This enables the fork assembly to not only be easily mounted and dismounted, but more importantly, to possess controllable horizontal movement relative to the chassis while mounted. This reciprocating movement capability is crucial for enabling the forklift to precisely pick up and place goods in confined spaces, significantly improving the equipment's operational flexibility and precision.

[0011] Optionally, the side wall of the fork slot is provided with a fork mounting assembly. The fork mounting assembly includes a mounting fixing block, a mounting support block, a torsion spring, a pin, a roller, and a guide surface. The mounting fixing block is fixedly installed on the side wall of the fork slot and has a groove to accommodate the pin. The mounting support block is rotatably connected to the mounting fixing block through the fitted pin and the torsion spring. A roller is rotatably connected to the mounting support block, and an inclined guide surface is provided below the roller.

[0012] The precision fork attachment assembly provides a foundation via a mounting block, defines the center of rotation using a pin, and provides automatic locking power with the aid of a torsion spring. The mounting support block acts as a motion conversion arm; its end roller interacts with the inclined guide surface on the fork assembly, cleverly converting the horizontal linear motion of the fork assembly into the rotational motion of the support block. Under the action of the spring force, it ultimately achieves automatic clamping, locking, and stable support. This design greatly simplifies the loading / unloading operation (usually requiring only pushing and pulling the fork assembly), ensures connection rigidity and positioning accuracy, and significantly reduces operating resistance through the rollers.

[0013] Optionally, the support platform is provided with a fork mounting and positioning port that cooperates with the roller.

[0014] A precision-machined, rigid geometric positioning feature (locating port) precisely engages with rollers to provide ultimate, backlash-free positioning for the fork assembly and rigidly transfers load to the chassis body. Combined with the guide surface and torsion spring-driven rotation of the load support block, this locating port ensures ultra-high repeatability of positioning under load, superior structural rigidity, and reliable mechanical locking.

[0015] Optionally, the support platform is provided with a fork lifting clearance opening that cooperates with the fork mounting assembly.

[0016] By precisely removing material from the moving parts (support platform) to form specific shaped notches (avoidance openings), a safe motion envelope space is reserved for the immovable forklift mounting assembly, thus ensuring that the support platform can move freely, smoothly, and without collisions throughout the entire lifting stroke. This seemingly simple structure is crucial for ensuring the reliable operation of the forklift's lifting function and the overall structural safety of the equipment, and is an indispensable spatial coordination method in precision mechanical design.

[0017] Optionally, the fork assembly is provided with guide rails on both sides, and the fork slot is provided with guide grooves that cooperate with the guide rails.

[0018] A set of precision guide rails and guide slots (usually arranged symmetrically) forms the core guiding and load-bearing system for the horizontal reciprocating movement of the fork assembly within the frame slots. This ensures linearity, low resistance, high precision, and stability during movement, and effectively resists lateral forces and torques during operation. It is an indispensable basic mechanical structure for ensuring smooth loading / unloading, precise positioning and fine-tuning of the forklift's fork module, and maintaining structural rigidity under load.

[0019] Optionally, the lead screw and nut structure is connected to a lifting motor, and the output shaft of the lifting motor is connected to the lead screw via a coupling.

[0020] The lifting motor provides the power source and control interface, with its output shaft delivering power. The coupling acts as an indispensable bridge and buffer, ensuring that power is transmitted smoothly, reliably, and without damage to the lead screw, overcoming the unavoidable alignment errors in mechanical installation. The rotation of the lead screw is ultimately converted into the precise linear displacement required to drive the scissor lift mechanism through the lead screw-nut structure.

[0021] Optionally, the walking mechanism includes a driving wheel and a driven wheel, with the driving wheel connected to a walking motor.

[0022] The drive motor acts as the power source, supplying power to the drive wheels and making them the driving wheels that generate traction. The driven wheels, on the other hand, play an auxiliary role in supporting the wheels, sharing the load, and facilitating steering.

[0023] Optionally, the driven wheels of the vehicle frame's running mechanism are swivel wheels.

[0024] By giving the frame the ability to freely turn 360 degrees at the driven support points, the frame body can follow any directional change of the drive wheels with extreme flexibility and low resistance, easily achieving very small radius turns, stationary rotations, and smooth movement in any direction.

[0025] Optionally, an electrical wire is connected between the chassis body and the fork assembly.

[0026] The wiring is used to power and control the fork assembly.

[0027] Beneficial effects

[0028] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0029] The technical solution provided by this utility model achieves low-profile entry through a flat frame and enhances flexibility through a detachable modular design. The core lies in the fork assembly and its scissor lift mechanism (combined with a lead screw and nut drive), which provides the ability to enter with minimal compression height and lift stably over a long stroke. The design of both the frame and the forks being equipped with a traveling mechanism ensures coordinated and precise movement and efficient operation in narrow spaces. It systematically solves the key technical problems of traditional forklifts' difficulty in operating in narrow spaces and the blind spots in handling low-profile vehicles. Attached Figure Description

[0030] Figure 1 A schematic diagram of the overall structure of a stealthy forklift proposed in an embodiment of this utility model;

[0031] Figure 2 A schematic diagram of the bottom structure of a lurking forklift, as proposed in an embodiment of this utility model;

[0032] Figure 3 A schematic diagram of the fork assembly of a stealthy forklift, provided for an embodiment of this utility model;

[0033] Figure 4 A schematic diagram of the structure of a forklift mounting assembly for a lurking forklift, as proposed in an embodiment of this utility model;

[0034] Figure 5 A cross-sectional view of a forklift mounting assembly for a lurking forklift, as proposed in an embodiment of this utility model;

[0035] 1. Frame; 11. Frame body; 111. Fork slot; 12. Drive wheel; 13. Driven wheel; 14. Fork mounting assembly; 141. Mounting block; 142. Mounting support block; 143. Torsion spring; 144. Pin; 145. Roller; 146. Guide surface; 15. Travel motor; 2. Fork assembly; 21. Support platform; 211. Fork lifting clearance opening; 212. Fork mounting positioning opening; 22. Fork chassis; 221. Guide groove; 23. Fork travel mechanism; 24. Scissor lift mechanism; 25. Screw and nut structure; 26. Lifting motor. Detailed Implementation

[0036] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0037] Example

[0038] Combined with appendix Figure 1-2 A stealthy forklift includes a flat frame 1. The frame 1 includes a frame 1 body and a fork assembly 2 that can be mounted on the frame 1 body. The fork assembly 2 includes a support platform 21, a fork chassis 22, and a scissor lift mechanism 24. The support platform 21 is connected to the fork chassis 22 through the scissor lift mechanism 24. The scissor lift mechanism 24 includes connected scissor legs and a screw and nut structure 25. The support platform 21 is liftable. Both the frame 1 and the fork assembly 2 are equipped with a traveling mechanism. The frame 1 body and the fork assembly 2 are separable structures.

[0039] The flat frame 1 significantly reduces the overall height of the vehicle, allowing it to easily access the bottom of low shelves or under pallets, overcoming the limitations of traditional forklifts' excessive size. The frame 1 forms the basic framework of the entire handling platform, on which the critical fork assembly 2 can be mounted. This detachable design provides great flexibility, allowing the forklift to detach the fork assembly 2 when not handling goods, enabling free movement or other tasks (such as towing) with a smaller profile, improving the equipment's versatility and space utilization. The fork assembly 2 itself includes a support platform 21, a key component that directly supports and securely holds goods; the fork chassis 22 provides a stable mounting base for the entire fork assembly 2. The scissor lift mechanism 24, connecting the support platform 21 and the fork chassis 22, is a key innovation for achieving low-profile entry and high lifting. Its scissor outrigger structure has a minimal compression height in the retracted state, facilitating entry, while its extended state provides a large-stroke lifting capacity far exceeding its own compression height. The screw and nut structure 25 (usually driven by a motor) provides precise, stable, and powerful drive for the scissor mechanism's lifting, ensuring smooth and controllable cargo lifting. Finally, the design of both the chassis 1 and the fork assembly 2 having a traveling mechanism is crucial. This allows the chassis 1 and the fork assembly 2, carrying cargo, to move flexibly and collaboratively or independently, jointly completing the entire process of low-profile entry, precise picking, lifting, and efficient handling in narrow passages, completely solving the blind spot problem in low-space operations.

[0040] The main body of the frame 1 has a fork slot 111 for accommodating the fork assembly 2, within which the fork assembly 2 reciprocates. The main body of the frame 1 has an overall "mountain"-shaped layout, with the fork slot 111 located at the opening of the "mountain". The core function of the fork slot 111 is to provide a space for accommodating the fork assembly 2 and a track for its movement. Its function is twofold: firstly, as a physical interface, it provides a positioning reference and support structure for the fork assembly 2 to be embedded into the main body of the frame 1, ensuring accurate and stable positioning of the fork assembly 2 when loaded; secondly, its specific shape and size design (such as grooves and slides) constitute a precise guide path, enabling the fork assembly 2 to perform controllable, linear reciprocating movement within it. This design allows the fork assembly 2 to slide in or out horizontally relative to the main body of the frame 1 when loaded. Its key functions are: 1. To achieve loading and unloading: the fork assembly 2 can slide into the slot along the slot track to achieve loading, or slide out in the opposite direction to achieve quick unloading; 2. To provide fine-tuning positioning capability: in the loaded state, the fork assembly 2 can move back and forth within a small range within the slot, which facilitates precise horizontal position fine-tuning before picking up goods or placing goods, ensuring that the forks can accurately align with the target pallet or rack socket, overcoming installation errors or positioning deviations; 3. To ensure structural rigidity and force transmission: the slot structure not only guides the movement, but also effectively transmits the load (especially the horizontal component) to the main body of the frame 1 through its side walls and other constraint surfaces, ensuring the stability and rigidity of the overall structure when the fork assembly 2 is carrying goods.

[0041] Combined with appendix Figure 4 , 5The side wall of the fork slot 111 is provided with a fork mounting assembly 14. The fork mounting assembly 14 includes a mounting fixing block 141, a mounting support block 142, a torsion spring 143, a pin 144, a roller 145, and a guide surface 146. The mounting fixing block 141 is fixedly installed on the side wall of the fork slot 111 and has a groove to accommodate the pin 144. The mounting support block 142 is rotatably connected to the mounting fixing block 141 through the fitted pin 144 and the torsion spring 143. The roller 145 is rotatably connected to the mounting support block 142, and an inclined guide surface 146 is provided below the roller 145. In this embodiment, a precise fork mounting assembly 14 is designed on the side wall of the fork slot 111. This assembly consists of several key components working together: the mounting block 141, serving as the mounting base for the entire assembly, is fixedly mounted on the side wall of the fork slot 111, providing a stable support foundation for other components. The slot on the block 141 that accommodates the pin 144 provides a precise mounting position for the pin 144. The pin 144, acting as the core rotational axis, runs through both the mounting block 141 and the mounting support block 142. The mounting support block 142 is a movable component, achieving a rotatable connection with the mounting block 141 by fitting onto the pin 144. A torsion spring 143 is also fitted onto the pin 144, its preload acting on the mounting support block 142, providing it with a continuous rotational reset torque (typically causing it to tend to deflect inwards or downwards). The roller 145 is rotatably connected to the mounting support block 142, its core function being to reduce friction and provide a guiding contact point. The inclined guide surface 146 located below the roller 145 (usually at the corresponding position of the fork assembly 2) is key to triggering the entire mechanism's operation. Its contact with the roller 145 converts horizontal movement (sliding in / out of the fork assembly 2) into rotational movement of the mounting support block 142. When the fork assembly 2 slides into the slot, the guide surface 146 first contacts the roller 145, pressing it upwards or outwards, thus overcoming the force of the torsion spring 143 and causing the mounting support block 142 to rotate around the pin 144. When the fork assembly 2 is fully in place, the roller 145 passes the high point of the guide surface 146 or enters a specific locking position. Under the return torque of the torsion spring 143, the mounting support block 142 rotates in the opposite direction, driving the roller 145 to press against the specific position of the guide surface 146 or into the groove, generating a horizontal clamping force to eliminate gaps and simultaneously providing vertical support, achieving automatic locking and positioning of the fork assembly 2. The separation process is the opposite: an external force is applied to drag the fork assembly 2, and the guide surface 146 presses the roller 145 again to make the support block rotate and unlock.

[0042] The support platform 21 is provided with a fork mounting positioning slot 212 that mates with the roller 145. The core function of the positioning slot is to form a final, high-precision engagement with the roller 145 on the mounting assembly. Its function is as follows: when the fork assembly 2 slides into the slot, the guide surface 146 on it guides the roller 145 to move and triggers the rotation of the mounting support block 142. Driven by the torsion spring 143, the roller 145 will eventually fall precisely into or abut against this positioning slot. This positioning slot (usually designed as a recess, notch, or a specific contour surface) provides a defined, immovable locking point for the roller 145. Its key functions are: 1. Providing ultimate positioning: Eliminating any residual horizontal or vertical degrees of freedom of the fork assembly 2 in the loaded state, ensuring that the position of the fork assembly 2 relative to the main body of the frame 1 is absolutely accurate and non-slip, which is crucial for the accuracy of picking up goods; 2. Enhancing rigid connection and load-bearing capacity: After the roller 145 is embedded in the positioning port, the load of the fork assembly 2 (especially the support platform 21 and the weight of the goods it carries) is directly and rigidly transferred to the mounting fixing block 141 and the main body of the frame 1 through the mounting support block 142 and the pin 144, which greatly improves the rigidity and stability of the overall structure and prevents shaking or displacement when handling heavy objects or bearing impacts; 3. Assisting locking: Working together with the guide surface 146 and the spring force, it forms an over-positioning or geometric locking, making it impossible for the fork assembly 2 to easily disengage in the loaded state unless sufficient external force is applied to overcome the spring force and guide the roller 145 to move in the opposite direction along the guide surface 146 to unlock.

[0043] Combined with appendix Figure 3 The support platform 21 is provided with a fork lifting clearance opening 211 that cooperates with the fork mounting assembly 14. The core function of the clearance opening is to provide the necessary physical space passage. Specifically, it is a notch, groove, or hollow area precisely designed according to the spatial envelope of the mounting assembly on the platform's lifting path. Its key function is that when the support platform 21 is lowered (e.g., to prepare for insertion under the cargo or to reset after cargo placement), the clearance opening provides sufficient vertical space for the protruding parts of the mounting assembly (especially the mounting support block 142 and roller 145) to move downwards, preventing the bottom surface of the platform from colliding hard with these components, thus avoiding damage to the mechanism or obstruction of movement. More importantly, during the lifting process of the support platform 21 (lifting the cargo), even if the mounting support block 142 is at a certain angle due to spring force or its own structure, the clearance opening can avoid these fixed or limited-movement components, ensuring that the platform can be smoothly and unimpededly raised to the designed highest position.

[0044] The fork assembly 2 has guide rails on both sides, and the fork slot 111 has guide grooves 221 that mate with the guide rails. Guide rails are provided on both sides of the fork assembly 2 (usually located on its fork chassis 22 or support structure), and guide grooves 221 that precisely match the guide rails are provided at corresponding positions in the fork slot 111 of the frame 1 body. The core function of this mating structure is to provide high-precision linear guidance and stable lateral support. Specifically, the guide rails (usually raised ribs, slide rails, or rollers 145) serve as guiding references on the fork assembly 2, defining the movement trajectory; while the guide grooves 221 (recessed grooves, slides, or guide rail sleeves) are fixed to the slot of the frame 1, serving as load-bearing and constraint references. When the fork assembly 2 moves within the slot, the guide rails on both sides are embedded and slide (or roll) in the corresponding guide grooves 221. The key functions of this combination are: 1. Precision linear guidance: It forces the fork assembly 2 to move strictly along the straight path defined by the guide groove 221, eliminating swaying or jamming, and ensuring high repeatability of positioning accuracy, which is crucial for the precise alignment of the forks with the pallet inserts; 2. Low-friction movement: If roller 145 guide rails or lubricated slide rails are used, the movement resistance can be significantly reduced, making loading / unloading and fine-tuning operations easier and smoother; 3. Bearing lateral forces and moments: The inner wall of the guide groove 221 provides a rigid lateral support surface for the guide rail, which can effectively bear the lateral forces, torsional loads or overturning moments (such as the shift of the center of gravity of the goods or the inertial force of the turning) generated by the fork assembly 2 during picking up, handling and placing goods, preventing the fork assembly 2 from shaking or tilting in the groove, and ensuring the stability and rigidity of the overall structure; 4. Sharing vertical loads: Although the main vertical load is borne by the mounting assembly or chassis support points, the guide rail-guide groove 221 combination can also share some of the vertical force, improving the load-bearing capacity.

[0045] The lead screw and nut structure 25 is connected to a lifting motor 26, and the output shaft of the lifting motor 26 is connected to the lead screw via a coupling. Specifically, the lead screw in the lead screw and nut structure 25 (which serves as a direct drive force conversion device for the extension and retraction of the scissor lift mechanism) requires rotational motion input. The core function of the lifting motor 26 (typically a servo motor or stepper motor) is to provide controllable rotational power (torque and speed). Its output shaft is the output end of the motor's rotational power. To efficiently, reliably, and with some allowable deviation compensation, the motor's rotational power is transmitted to the lead screw, a coupling is provided between the motor output shaft and the lead screw. The key functions of couplings are: 1. Torque transmission: transmitting the rotational torque generated by the motor to the lead screw without loss or with low loss, enabling it to rotate; 2. Misalignment compensation: absorbing and compensating for minor coaxiality errors, angular deviations, or axial displacements that may exist between the motor mounting axis and the lead screw axis, preventing additional stress, vibration, wear, or even jamming caused by misalignment, and ensuring smooth and reliable transmission; 3. Buffering and vibration reduction: some types of couplings (such as flexible couplings) can also absorb shocks and vibrations, protecting the motor and the lead screw and nut mechanism.

[0046] Combined with appendix Figure 2 The traveling mechanism includes a drive wheel and a driven wheel 13, with the drive wheel connected to a traveling motor 15. Specifically, the drive wheel 12 is the key drive wheel providing traction, and its core function is to convert rotational power into driving force to propel the entire vehicle. To drive the drive wheel's rotation, the system is connected to the traveling motor 15. As the core power source of the traveling mechanism, the traveling motor 15's core function is to output controllable rotational torque. The output shaft of the traveling motor 15 (or via a reducer) is directly or indirectly connected to and drives the drive wheel. When the traveling motor 15 starts, the torque it generates drives the drive wheel to rotate, and the drive wheel generates traction force to propel the forklift through friction with the ground. The driven wheel 13's main function is to bear part of the vehicle's weight and provide auxiliary support and steering freedom. It typically does not have independent driving capability but can rotate freely to adapt to changes in direction (e.g., follow-steering or rolling in a fixed direction). The drive wheel and driven wheel 13 work together: the drive wheel provides driving force to overcome resistance and propel the entire vehicle, while the driven wheel 13 shares the load, stabilizes the vehicle body, and follows the movement trajectory. By precisely controlling the speed and direction of the travel motor 15 (especially if the left and right drive wheels are driven independently), the forklift can achieve precise straight-line travel, differential steering (rotation in place or small-radius turning), and speed adjustment, enabling it to move flexibly and accurately in complex environments such as narrow warehouse aisles and the bottom of shelves.

[0047] The driven wheel 13 of the running mechanism of the frame 1 is a swivel wheel.

[0048] There are wires connecting the main body of the frame 1 and the fork assembly 2.

[0049] Working principle:

[0050] 1. Pick up the goods from the ground and load them onto the vehicle.

[0051] The support platform 21 is raised by the scissor lift mechanism 24 until the wheels touch the ground and are detached from the load.

[0052] Action: The scissor lift mechanism 24 lifts the support platform 21.

[0053] Purpose: The wheels of fork assembly 2 contact the ground and bear the weight of fork assembly 2. Simultaneously, the fork assembly 2 frame is raised to a sufficient height to disengage it from the fork mounting assembly 14 on the vehicle body. Fork assembly 2 is now in a "free" state, supported only by its own wheels.

[0054] Fork assembly 2 extends to align with the clearance opening:

[0055] Action: The telescopic mechanism pushes the fork assembly 2 outward horizontally.

[0056] Objective: To move a specific structure at the front end of the fork assembly 2 (“fork lifting clearance opening 211”) to a position precisely aligned with the fork mounting assembly 14 on the vehicle body. This prepares the fork assembly 2 for subsequent descent and smooth movement under the cargo, ensuring no interference with the fork mounting assembly 14.

[0057] Forklift assembly 2 descends to its lowest point:

[0058] Action: The scissor lift mechanism 24 lowers the fork assembly 2.

[0059] Purpose: To lower the fork face (the part that inserts the goods) of the fork assembly 2 to the height below the ground goods pallet, in preparation for inserting the goods underneath.

[0060] Fork assembly 2 moves under the goods:

[0061] Action: The entire vehicle moves forward.

[0062] Purpose: To push the lowered fork assembly 2 (which is now supported by its own wheels) under the goods (usually a pallet).

[0063] Fork assembly 2 rises to its highest position:

[0064] Action: The scissor lift mechanism 24 lifts the fork assembly 2.

[0065] Purpose: The fork assembly 2 lifts the goods off the ground. At this time, the weight of the goods and forks is borne by the scissor lift mechanism 24 of the forks (through the support platform 21), and the wheels of the forks may be off the ground or the load-bearing capacity may be reduced.

[0066] Fork assembly 2 and cargo retracted to the top of the vehicle body:

[0067] Action: The telescopic mechanism pulls the fork assembly 2 carrying the goods horizontally backward.

[0068] Objective: To retract the cargo and fork assembly 2 to a safe transport position directly above the vehicle body.

[0069] The fork assembly 2 descends onto the fork mounting assembly 14 and the wheels are off the ground:

[0070] Action: The scissor lift mechanism 24 lowers the fork assembly 2 (and the goods).

[0071] Purpose: To reposition the fork assembly 2 onto the fork mounting assembly 14 on the vehicle body, whereby the fork mounting assembly 14 bears the weight of the fork assembly 2, the cargo, and the scissor lift mechanism 24. The fork wheels are now off the ground and no longer bear weight. The fork assembly 2 is then reattached and secured to the vehicle body, ready for transport.

[0072] 2. Unloading goods from the vehicle to the ground.

[0073] Fork assembly 2 rises to its highest point:

[0074] Action: The scissor lift mechanism 24 lifts the fork assembly 2 (and the goods).

[0075] Objective: To lift the cargo to a sufficient height to ensure that it can completely leave the vehicle structure when the fork assembly 2 extends, thus avoiding a collision. Simultaneously, to detach the support platform 21 from the fork mounting assembly 14 (at which point the wheels may begin to contact the ground).

[0076] Fork assembly 2 moves the vehicle body:

[0077] Action: The telescopic mechanism pushes the fork assembly 2, which is carrying the goods, outward horizontally.

[0078] Objective: To move the goods outside the vehicle and position them directly above the target placement point.

[0079] Forklift assembly 2 descends to its lowest point:

[0080] Action: The scissor lift mechanism 24 lowers the fork assembly 2 (and the goods).

[0081] Purpose: To place the goods smoothly on the ground.

[0082] Fork assembly 2 retracts into the vehicle body:

[0083] Action: The telescopic mechanism pulls the (unloaded) fork assembly 2 horizontally backward.

[0084] Objective: To remove the empty fork assembly 2 from under the cargo and retract it into the vehicle body area.

[0085] Fork assembly 2 is raised above fork mount assembly 14:

[0086] Action: The scissor lift mechanism 24 lifts the fork assembly 2.

[0087] Purpose: To ensure that the support platform 21 is raised above the fork mounting assembly 14, in preparation for the next step of lowering and accurately placing it onto the fork mounting assembly 14, and to avoid collision.

[0088] The fork assembly 2 descends onto the fork mounting assembly 14 and the wheels are off the ground:

[0089] Action: The scissor lift mechanism 24 lowers the fork assembly 2.

[0090] Purpose: To reposition the support platform 21 of the empty fork assembly 2 onto the fork mounting assembly 14 on the vehicle body, allowing the fork mounting assembly 14 to bear the weight. The fork wheels are lifted off the ground. The forks are re-mounted and secured to the vehicle body, restoring the vehicle to its standby / transportation state.

[0091] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A stealthy forklift, characterized in that, The vehicle includes a flat frame, which comprises a frame body and a fork assembly that can be mounted on the frame body. The fork assembly includes a support platform, a fork chassis, and a scissor lift mechanism. The support platform is connected to the fork chassis via the scissor lift mechanism, which includes connected scissor legs and a lead screw and nut structure. The support platform is liftable. Both the frame and the fork assembly are equipped with a traveling mechanism. The frame body and the fork assembly are separable structures.

2. The stealth forklift according to claim 1, characterized in that, The main body of the frame is provided with a fork slot for accommodating the fork assembly, and the fork assembly reciprocates within the fork slot.

3. A stealthy forklift according to claim 2, characterized in that, The side wall of the fork slot is provided with a fork mounting assembly. The fork mounting assembly includes a mounting fixing block, a mounting support block, a torsion spring, a pin, a roller, and a guide surface. The mounting fixing block is fixedly installed on the side wall of the fork slot and has a groove to accommodate the pin. The mounting support block is rotatably connected to the mounting fixing block through the fitted pin and the torsion spring. A roller is rotatably connected to the mounting support block, and an inclined guide surface is provided below the roller.

4. A stealthy forklift according to claim 3, characterized in that, The support platform is provided with a fork mounting and positioning port that cooperates with the roller.

5. A stealthy forklift according to claim 4, characterized in that, The support platform is provided with a fork lifting clearance opening that cooperates with the fork mounting assembly.

6. A stealthy forklift according to claim 2, characterized in that, The fork assembly has guide rails on both sides, and the fork slot has guide grooves that cooperate with the guide rails.

7. A stealthy forklift according to claim 1, characterized in that, The lead screw and nut structure is connected to a lifting motor, and the output shaft of the lifting motor is connected to the lead screw via a coupling.

8. A stealthy forklift according to claim 1, characterized in that, The walking mechanism includes a driving wheel and a driven wheel, and the driving wheel is connected to a walking motor.

9. A stealthy forklift according to claim 8, characterized in that, The driven wheels of the vehicle frame's running mechanism are omnidirectional wheels.

10. A stealthy forklift according to claim 1, characterized in that, There are wires connecting the main body of the vehicle frame and the fork assembly.

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