A lever-lifting and transfer trolley for turnover boxes and its usage method

Abstract

This invention relates to the field of material handling auxiliary equipment, and discloses a lever-lifting and transferring trolley for transporting turnover boxes, suitable for handling square turnover boxes with flanges. The trolley includes a supporting base, lifting forks, wheels, and a control lever. The supporting base and lifting forks are C-shaped frames with front openings, hinged together by a first angled connecting block. The wheel seats have horizontal baffles that limit the lowering limit of the lifting forks. The rear end of the supporting base has a control lever mounting seat with a first mounting rod. The control lever has an independent hinge fulcrum and is hinged to the lifting forks via a second connecting block. The first mounting rod has a limiting post, enabling gravity self-locking after lifting to the correct position. This invention is labor-saving to operate, safe to transport, and prevents falling back after lifting, significantly reducing the labor intensity of turnover box transport and making it suitable for high-frequency transport operations in workshops.

Description

Technical Field

[0001] This invention relates to the field of auxiliary equipment for material handling, and in particular to a lever-lifting transfer trolley for turnover boxes and its method of use. Background Technology

[0002] In industrial manufacturing, warehousing, and logistics, flanged square turnover boxes are core carriers for parts, semi-finished products, and finished goods, widely used in industries such as automotive parts, electronics, and food processing. With the increasing prevalence of flexible production models, the demand for short-distance, high-frequency material transfers between multiple processes within a workshop continues to grow, and the efficiency of turnover box transfers directly impacts the overall flow rhythm of the production line. Currently, the mainstream equipment used for turnover box transfer operations includes three types of equipment: industrial forklifts, flatbed trolleys, and hydraulic pallet trucks. Industrial forklifts are primarily used for large-batch, long-distance transfers, while flatbed trolleys and hydraulic pallet trucks are mainly used for short-distance, flexible transfers within the workshop, making them core equipment for material flow between processes.

[0003] Existing turnover box transfer equipment has significant technical shortcomings in practical applications: Industrial forklifts require certified professionals to operate, the number of such vehicles is limited, and starting and stopping are cumbersome and inefficient for short-distance, high-frequency transfers, with insufficient maneuverability in confined workshop spaces; Flatbed handcarts require manual loading and unloading of fully loaded turnover boxes, and multiple people are needed to work together under heavy loads, resulting in high labor intensity, low efficiency, and safety hazards such as back injuries; Existing transfer vehicles with lifting functions generally suffer from problems such as the control structure being tied to the lifting mechanism, fixed operating arm, and laborious operation, and lack of a stable anti-fall structure after lifting, making them prone to loosening and tipping during heavy-load transfers, while also having insufficient ergonomic design, leading to fatigue during long-term operation, complex structure, and high maintenance costs, making them unsuitable for the high-frequency, lightweight transfer operations required in workshops.

[0004] The above background information is provided only to aid in understanding the concept and technical solution of this invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0005] The purpose of this invention is to propose a lever-lifting and transfer trolley for turnover boxes and its usage method, so as to solve the technical problems existing in the prior art, such as laborious operation, easy loosening and falling back after lifting, and easy overturning under heavy load.

[0006] Therefore, this invention proposes a lever-lifting and transfer trolley for turnover boxes and its usage method.

[0007] Preferably, the present invention may also have the following technical features:

[0008] A lever-lifting and transfer trolley for transporting square turnover boxes with flanges, the square turnover box including a square frame and a flange on the upper part of the square frame, including a supporting base, lifting forks, several wheels and a control lever;

[0009] Both the support base and the lifting fork are C-shaped frames with openings on the front. The lifting fork is parallel to and movably disposed above the support base, and the openings of the support base and the lifting fork correspond front to back.

[0010] The two sides of the lifting fork frame and the two sides of the bearing base frame are hinged by multiple sets of first connecting blocks; the first connecting block has an angled structure, including a first hinge plate and a second hinge plate set at a fixed angle, the first hinge plate is hinged to the lifting fork frame, and the second hinge plate is hinged to the bearing base frame.

[0011] The wheels are mounted on the support base frame via wheel seats, wherein two wheel seats near the opening are fixed to the bottom of the support base frame, and horizontal baffles are fixed on the two wheel seats. The horizontal baffles are used to fit and limit the second hinge plate to restrict the extreme position of the lifting fork frame falling toward the support base frame.

[0012] The support base is fixedly provided with a joystick mounting seat at one end away from the opening. The joystick mounting seat includes a horizontally arranged first mounting rod. The lower end of the joystick is hinged to the first mounting rod. The hinge fulcrum of the joystick and the first mounting rod is independent of all hinge axes of the first connecting block and the support base and the lifting fork frame.

[0013] The control lever includes a first segment and a second segment. The second segment is connected to the upper end of the first segment at a fixed angle, and the second segment is located on the side of the first segment away from the supporting base. The first segment is hinged to the end of the lifting fork away from the opening via a second connecting block.

[0014] A limiting post is fixedly provided on the first mounting rod. The limiting post is located on the side of the first rod segment away from the supporting base frame. The limiting post is used to limit the maximum travel of the first rod segment in the direction away from the supporting base frame, so as to limit the highest lifting position of the lifting fork. When the first rod segment abuts against the limiting post, the weight of the square turnover box is transmitted to the first rod segment through the lifting fork and the second connecting block, so that the first rod segment continuously presses against the limiting post to form a gravity self-locking.

[0015] Preferably, each component of the supporting base frame, lifting fork frame and control lever is made of round tubular profile, and corresponding components are connected by connecting joints and locked and fixed at the joints by bolts.

[0016] Preferably, the lifting fork is provided with a lifting support.

[0017] Preferably, the first connecting block is an integrally formed structure, and the first hinge plate and the second hinge plate are combined to form a " "shape.

[0018] Preferably, the supporting frame extends rearward from the end away from the opening and is provided with a wheel assembly mounting rod, and two wheels on the side away from the opening are mounted on the wheel assembly mounting rod via wheel seats.

[0019] Preferably, the two wheels mounted on the wheel assembly mounting rod are swivel wheels.

[0020] Preferably, the extension direction of the first mounting rod is perpendicular to the extension direction of the side beam at the end of the supporting base away from the opening.

[0021] Preferably, a foot pedal stabilizing assembly is provided at the end of the first mounting rod away from the supporting base frame; the foot pedal stabilizing assembly includes a vertical connecting rod, a foot pedal crossbar, and a reinforcing support rod. The vertical connecting rod is fixed vertically to the end of the first mounting rod away from the supporting base frame, and the foot pedal crossbar is fixed horizontally to the end of the vertical connecting rod away from the first mounting rod. The top surface of the foot pedal crossbar is lower than the bottom surface of the supporting base frame, and the reinforcing support rod connects the foot pedal crossbar and the supporting base frame.

[0022] Preferably, the joystick further includes a horizontally arranged handle located at the top of the second joystick segment.

[0023] A method for using a lever-lifting and transfer trolley for turnover boxes, based on the turnover box lever-lifting and transfer trolley, includes the following steps:

[0024] S1. Lowering and positioning: Push the control lever counterclockwise to lower the lifting fork towards the supporting base frame until the second hinge plate of the first connecting block is in contact with the horizontal baffle on the wheel seat and is limited. Orient the opening of the transfer trolley towards the turnover box to be transported, and push the trolley to insert the lifting fork under the flange of the turnover box.

[0025] S2. Lifting Self-Locking: Pull the control lever clockwise to rotate it around the hinge point with the first mounting rod. This will drive the lifting fork to lift vertically upwards through the second connecting block until the first segment of the control lever abuts against the limit post. At this time, the weight of the turnover box is transmitted to the first segment through the lifting fork and the second connecting block, causing the first segment to continuously press against the limit post to form a gravity self-lock, thus completing the lifting and locking of the turnover box.

[0026] S3. Transfer and unloading: Push the control lever to move the transfer trolley to the target position, push the control lever counterclockwise to release the self-locking mechanism, so that the lifting fork falls down to separate from the flange of the turnover box, and pull out the transfer trolley to complete the unloading.

[0027] The beneficial effects of this invention compared to the prior art include:

[0028] 1. This application uses a lever hinge fulcrum design independent of the linkage mechanism to form a lever-type control structure, which greatly optimizes the lever arm ratio. Operators only need to apply a small pulling force to complete the lifting operation of heavy-duty turnover boxes, eliminating the need for manual handling of turnover boxes on and off the vehicle, significantly reducing labor intensity and improving turnover and transportation efficiency.

[0029] 2. This application uses a parallelogram linkage mechanism composed of multiple sets of angled first connecting blocks to ensure that the lifting fork only performs vertical translation and has no horizontal displacement, thus structurally preventing the lifting fork from coming off the underside of the turnover box flange; at the same time, gravity self-locking is achieved through the cooperation of the limiting column, which can achieve more stable locking as the load increases without the need for an additional locking mechanism, fundamentally eliminating the safety hazard of falling off after lifting.

[0030] 3. This application achieves precise limiting of the lifting fork's descent limit through a horizontal baffle on the wheel seat, and achieves precise limiting of the highest lifting position through a limiting post. The bidirectional limiting ensures that the lifting stroke is controllable throughout, avoiding structural interference and component damage caused by overtravel, and improving structural reliability and service life.

[0031] 4. The joystick of this application adopts a segmented design with a fixed angle, which is ergonomic. The operator can complete all operations while standing, without having to bend over. This greatly reduces fatigue during long-term, high-frequency transportation and can meet the usage needs of operators of different heights. Attached Figure Description

[0032] Figure 1 This is an assembly diagram of a specific embodiment of the present invention.

[0033] Figure 2 This is a structural schematic diagram of a specific embodiment of the present invention.

[0034] Explanation of reference numerals in the attached drawings: 1-Square turnover box; 101-Square frame; 102-Flange; 2-Bearing base frame; 21-Wheelset mounting rod; 3-Lifting fork frame; 31-Lifting bracket; 4-Wheel; 41-Horizontal baffle; 5-Control lever; 51-First lever segment; 52-Second lever segment; 53-Handle; 6-First connecting block; 61-First hinge plate; 62-Second hinge plate; 7-Control lever mounting seat; 71-First mounting rod; 8-Second connecting block; 9-Limiting post; 10-Connecting joint; 11-Foot pedal stabilizer assembly; 111-Vertical connecting rod; 112-Foot pedal crossbar; 113-Reinforcing support rod. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope or application of the present invention.

[0036] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein the same reference numerals denote the same parts unless otherwise specifically stated.

[0037] Orientation reference definition: In this specification, all orientation and direction terms are based solely on the structure of the aforementioned turnover box lever lifting and transfer trolley, and are defined as follows:

[0038] 1. Front and rear orientation: The side of the trolley with the opening for inserting the turnover box is the front side, and the side of the trolley where the control lever is installed is the rear side;

[0039] 2. Left and right orientation: From the perspective of the operator standing behind the trolley and facing the front of the trolley, the left side of the trolley is the left side of the operator and the right side of the trolley is the right side of the operator.

[0040] 3. Definition of rotation direction: The "clockwise rotation" and "counterclockwise rotation" mentioned in this manual are based solely on the perspective of the operator standing on the left side of the trolley and facing the right side of the trolley: the rotation that swings the control lever to the rear of the trolley and causes the lifting fork to rise is clockwise rotation, and the rotation that swings the control lever to the front of the trolley and causes the lifting fork to fall is counterclockwise rotation.

[0041] It should be clarified that when the operator's observation angle or standing position changes, the description of the clockwise or counterclockwise direction of rotation will change accordingly, but the corresponding transmission relationship between the swing direction of the control lever and the lifting action of the lifting fork remains unchanged. All operating methods that conform to this transmission logic are within the protection scope of this invention.

[0042] Example 1:

[0043] A type of lever-lifting transfer trolley for turnover boxes, such as Figure 1 and2 As shown, the lever-lifting and transfer trolley for turnover boxes disclosed in this embodiment of the invention is mainly applicable to short-distance transfer operations of square turnover boxes 1 with top flange 102 in factory production workshops and warehousing logistics scenarios. It solves the technical problems of existing turnover box handling equipment, such as laborious operation, easy loosening and falling back after lifting, easy tipping under heavy load, and poor ergonomics.

[0044] In the basic scheme of this embodiment, the turnover box lever lifting and transfer trolley includes a supporting base frame 2, a lifting fork 3, several wheels 4, and a control lever 5. Both the supporting base frame 2 and the lifting fork 3 are C-shaped frames with openings on the front. The lifting fork 3 is parallel to and movably positioned above the supporting base frame 2. The openings of the supporting base frame 2 and the lifting fork 3 correspond front to back, allowing the square turnover box 1 with flanges 102 to enter and exit the working area of ​​the transfer trolley through these openings. The C-shaped frame opening design allows the square turnover box 1 to enter the trolley's working range without needing to be lifted as a whole; only the flanges 102 need to be lifted to complete the transfer, significantly reducing operational intensity.

[0045] The two sides of the lifting fork 3 are hinged to the two sides of the supporting base 2 via multiple sets of first connecting blocks 6. Each first connecting block 6 has an angled structure, including a first hinge plate 61 and a second hinge plate 62 set at a fixed angle. The first hinge plate 61 is hinged to the lifting fork 3, and the second hinge plate 62 is hinged to the supporting base 2. The multiple sets of first connecting blocks 6 are arranged symmetrically from left to right and parallel from front to back, forming a parallelogram linkage mechanism. This ensures that the lifting fork 3 remains parallel to the supporting base 2 throughout the entire lifting process, only undergoing vertical translation without horizontal displacement in the front-to-back direction. Structurally, this prevents the lifting fork 3 from detaching from below the flange 102 of the square turnover box 1, improving operational safety.

[0046] The wheels 4 are mounted on the support frame 2 via wheel seats. Two wheel seats near the opening are fixed to the bottom of the support frame 2, and horizontal baffles 41 are fixed on these two wheel seats. The horizontal baffles 41 are used to fit and limit the movement of the lifting fork 3 towards the support frame 2. When the lifting fork 3 falls to its lowest position, the lower surface of the second hinge plate 62 is completely in contact with the upper surface of the horizontal baffle 41, forming a hard stop to prevent the lifting fork 3 from falling excessively and colliding with the support frame 2. At the same time, it ensures that the lifting fork 3 is in a horizontal state after falling into place, so that it can be accurately inserted under the flange 102 of the square turnover box 1, improving work efficiency.

[0047] The support frame 2 is fixedly provided with a joystick mounting seat 7 at one end away from the opening. The joystick mounting seat 7 includes a horizontally arranged first mounting rod 71. The lower end of the joystick 5 is hinged to the first mounting rod 71. The hinge fulcrum of the joystick 5 and the first mounting rod 71 is independent of all hinge axes of the first connecting block 6 and the support frame 2 and the lifting fork 3. In this design, the swing fulcrum of the joystick 5 is completely decoupled from the hinge linkage mechanism of the lifting fork 3 and is set independently. Unlike the existing technology where the handrail and the hinge linkage are directly fixed and the fulcrum is coaxial, the independent fulcrum design of this design can flexibly adjust the leverage ratio of the joystick 5. By optimizing the lever arm length, the pulling force required for operation is greatly reduced, achieving labor-saving operation. At the same time, it avoids interference between the swing of the joystick 5 and the lifting action of the lifting fork 3, improving structural reliability.

[0048] The control lever 5 includes a first segment 51 and a second segment 52. The second segment 52 is connected to the upper end of the first segment 51 at a fixed angle, and the second segment 52 is located on the side of the first segment 51 away from the supporting base 2. The first segment 51 is hinged to the end of the lifting fork 3 away from the opening via a second connecting block 8. The two ends of the second connecting block 8 are respectively hinged to the middle of the first segment 51 and the rear end of the lifting fork 3 via hinge shafts, forming a crank-slider type transmission mechanism. When the control lever 5 swings back and forth around the hinge fulcrum, the lifting fork 3 can be driven by the second connecting block 8 to complete the vertical lifting action. The transmission path is clear, and the action is smooth and without jamming. At the same time, the fixed angle design between the second segment 52 and the first segment 51 can be optimized according to the operator's height and operating habits, so that the operator can complete the push and pull operation without bending over, which conforms to ergonomic design and greatly reduces fatigue during long-term operation.

[0049] A limiting post 9 is fixedly provided on the first mounting rod 71. The limiting post 9 is located on the side of the first rod segment 51 away from the supporting base 2. The limiting post 9 is used to limit the maximum stroke of the first rod segment 51 in the direction away from the supporting base 2, so as to limit the highest lifting position of the lifting fork 3. When the first rod segment 51 abuts against the limiting post 9, the gravity of the square turnover box 1 is transmitted to the first rod segment 51 through the lifting fork 3 and the second connecting block 8, so that the first rod segment 51 continuously presses against the limiting post 9 to form a gravity self-locking. Its complete working principle is as follows: When the operator pulls the control lever 5 clockwise (swinging it towards the rear of the trolley, away from the load-bearing base 2), the first lever segment 51 rotates clockwise around the hinge fulcrum, driving the lifting fork 3 to rise vertically upwards through the second connecting block 8, until the rear surface of the first lever segment 51 abuts against the limit post 9, stopping the rotation, and the lifting fork 3 reaches its highest lifting position; at this time, the gravity of the square turnover box 1 acts vertically downwards on the fork arm of the lifting fork 3, causing the lifting fork 3 to have a vertical downward tendency to fall back. The downward force is transmitted to the first rod segment 51 through the second connecting block 8, forming a downward pressure on the first rod segment 51. This pressure generates a clockwise torque on the hinge fulcrum of the control lever 5. The direction of this torque is consistent with the rotation direction when the control lever 5 is raised, so that the first rod segment 51 is continuously and stably pressed against the limit post 9, and there will be no counterclockwise rotation (swinging towards the front of the trolley) or the lifting fork 3 falling back, forming a stable gravity self-locking. Moreover, the greater the load of the square turnover box 1, the greater the self-locking torque and the more stable the locking effect.

[0050] The aforementioned transfer trolley utilizes an independent fulcrum lever-type control lever 5 structure with an optimized lever arm design. Operators only need to apply a small pulling force to lift the heavy-duty square turnover box 1, eliminating the need for manual handling of the box on and off the trolley, significantly reducing labor intensity and improving transfer efficiency. A parallelogram linkage mechanism ensures that the lifting fork 3 only performs vertical translational motion, without forward or backward movement, preventing it from detaching from below the flange 102 of the square turnover box 1. Simultaneously, a gravity self-locking structure ensures that the greater the load, the more stable the locking becomes, completely eliminating the risk of loosening after lifting. A horizontal baffle 41 precisely limits the lower limit of the lifting fork 3, and a limiting post 9 precisely limits the upper limit. Bidirectional limiting ensures controllable lifting stroke, preventing structural interference or damage caused by over-travel. The angled design of the control lever 5 allows operators to complete all operations while standing, eliminating the need to bend over, significantly reducing fatigue during long-term work, and adapting to the needs of operators of different heights.

[0051] In some examples of this embodiment, the components of the supporting base 2, lifting fork 3, and control lever 5 are all made of round tubular profiles. Corresponding components are connected via connecting joints 10 and secured with bolts at the joints. The connecting joints 10 can be standard profiles such as two-way joints, three-way joints, and elbow joints that match the round tubular profiles, eliminating the need for custom molds and significantly reducing manufacturing costs. Furthermore, the bolt-locked detachable connection, compared to welding, eliminates the need for specialized welding equipment, allowing for on-site assembly, disassembly, and maintenance. Damaged components can be replaced individually without requiring overall scrapping, greatly reducing subsequent maintenance costs. Round tubular profiles are common industrial standard parts, with low procurement costs and easy availability, requiring no custom processing. The detachable connection using connecting joints 10 and bolts eliminates the need for welding, lowering the assembly threshold and facilitating convenient and quick maintenance and component replacement. Compared to solid profiles, round tubular profiles significantly reduce the overall vehicle weight while maintaining structural strength, making movement more flexible and operation less strenuous. It can directly use stainless steel round tubes or aluminum alloy round tubes, which are suitable for complex working conditions such as damp workshops and oil stains, and have a longer service life.

[0052] In some other examples of this embodiment, the lifting fork 3 is provided with a lifting bracket 31. The lifting bracket 31 is located on the upper surface of the fork arm of the lifting fork 3, corresponding to the position of the flange 102 of the square turnover box 1. The upper surface of the lifting bracket 31 is flush with or slightly higher than the upper surface of the fork arm, and can be directly embedded in the slot below the flange 102 of the square turnover box 1, or directly abut against the lower surface of the flange 102, thereby improving the stability of the lifting.

[0053] In some examples of this embodiment, the first connecting block 6 is a one-piece molded structure, and the first hinge plate 61 and the second hinge plate 62 are combined to form a " The first connecting block 6 can be integrally stamped from steel plate or integrally cast from cast steel, without splicing welds, resulting in strong structural integrity. The integrally formed structure eliminates stress concentration points caused by welding and splicing, exhibiting strong resistance to deformation and fracture, and can bear greater heavy loads, increasing the overall load capacity of the vehicle. The integral forming process allows for precise control of the fixed angle between the first hinge plate 61 and the second hinge plate 62, ensuring dimensional consistency among multiple sets of first connecting blocks 6, and ensuring smooth, unhindered operation of the parallelogram linkage mechanism. The absence of splicing gaps prevents the accumulation of dust and oil, reduces corrosion, and provides excellent fatigue resistance, making it less prone to damage during long-term repeated operation and significantly extending its service life. The angled structure can perfectly fit with the horizontal baffle 41 on the wheel seat. When the lifting fork 3 falls to the limit position, the lower surface of the second hinge plate 62 is in full surface contact with the horizontal baffle 41, making the stop and limit more stable and avoiding stress concentration caused by point contact.

[0054] In some examples of this embodiment, the end of the support frame 2 away from the opening extends rearward and is provided with a wheel assembly mounting rod 21. Two wheels 4 on the side away from the opening are mounted on the wheel assembly mounting rod 21 via wheel seats. In a further example of this embodiment, the two wheels 4 mounted on the wheel assembly mounting rod 21 are swivel wheels. The wheel assembly mounting rod 21 extends rearward along the front-rear direction of the support frame 2, moving the mounting position of the rear wheels 4 out of the main body of the support frame 2, significantly increasing the wheelbase between the front and rear wheels 4. After the rear wheels 4 are moved rearward, the wheelbase between the front and rear wheels increases significantly. Under heavy load, the center of gravity of the vehicle shifts rearward, which can generate a stronger anti-overturning moment through the extended lever arm, completely eliminating the safety hazard of the front end tilting upward and the whole vehicle tipping over when fully loaded, and improving the safety of heavy-load operations. With a wheel arrangement featuring omnidirectional wheels at the rear and directional wheels at the front, when the operator stands at the rear of the trolley and holds the control lever 5 to turn, only a small swing of the control lever 5 is needed to achieve flexible steering via the omnidirectional wheels at the rear. Small-radius turns and U-turns on the spot can be easily achieved. Compared to four-wheel omnidirectional wheels, it is more stable, and compared to four-wheel directional wheels, it is more flexible, greatly reducing the difficulty of operation.

[0055] In some other examples of this embodiment, the extension direction of the first mounting rod 71 is perpendicular to the extension direction of the side beam at the end of the support frame 2 away from the opening. In a further example of this embodiment, a foot pedal stabilizing assembly 11 is provided at the end of the first mounting rod 71 away from the support frame 2; the foot pedal stabilizing assembly 11 includes a vertical connecting rod 111, a foot pedal crossbar 112, and a reinforcing support rod 113. The vertical connecting rod 111 is fixed vertically to the end of the first mounting rod 71 away from the support frame 2, the foot pedal crossbar 112 is fixed horizontally to the end of the vertical connecting rod 111 away from the first mounting rod 71, the top surface of the foot pedal crossbar 112 is lower than the bottom surface of the support frame 2, and the reinforcing support rod 113 connects the foot pedal crossbar 112 and the support frame 2. The first mounting rod 71 extends horizontally in the front-to-back direction and is perpendicular to the left-to-right side beams at the rear end of the supporting base frame 2, providing stable hinge support for the control lever 5 and providing an installation base for the foot pedal stabilizer assembly 11; the foot pedal crossbar 112 is arranged laterally in the left-to-right direction to accommodate the stepping width of the operator's two feet, and the reinforcing support rod 113 is an obliquely arranged support rod, forming a stable triangular support structure.

[0056] When the operator pulls the control lever 5 to lift the heavy-duty square turnover box 1, they can firmly fix the box to the ground by stepping on or bracing their feet against the foot pedal crossbar 112. This prevents the box from lurching forward during lifting and balances the reaction force, preventing the box from tilting. This allows the operator to focus entirely on the lifting operation without needing to control the box's stability, making the operation more effortless and safer. The vertical connecting rod 111, the foot pedal crossbar 112, and the reinforcing support rod 113 together form a stable triangular support structure with strong resistance to deformation, capable of supporting the operator's entire weight and also withstanding the lifting pressure. The alternating load during lifting ensures high structural reliability. The top surface of the foot pedal crossbar 112 is lower than the bottom surface of the support frame 2, ensuring that the operator's feet will not interfere with the support frame 2 or the wheels 4 when stepping on it. At the same time, it is adapted to the operator's foot height when standing, and the stepping posture is natural and ergonomic. In addition to stepping on it to fix the vehicle body, the operator can also push the foot pedal crossbar 112 with their feet to assist in adjusting the position of the trolley without having to bend over to adjust it by hand, further improving the convenience of operation. At the same time, when the trolley is not in use, it can be moved by pushing the foot pedal crossbar 112, making the use scenario more flexible.

[0057] In some examples of this embodiment, the joystick 5 further includes a horizontally arranged handle 53, which is located at the top of the second lever segment 52. The handle 53 is arranged horizontally in the left-right direction, and its length is adapted to the width of the operator's two hands, providing a stable grip point for the operator. The horizontally arranged handle 53 can be adapted to the operator's two-handed grip, which provides more even force distribution and a more stable grip compared to single-handed grip, and requires less effort when pushing or pulling. Holding the handle 53 with both hands allows for better control of the swing speed and angle of the joystick 5, avoiding slippage and loss of control when operating with one hand, and improving the safety of operation. According to the operator's usage habits, accessories such as anti-slip sleeves and grip rubber sleeves can be added to the handle 53 to further improve grip comfort and adapt to the usage needs in complex working conditions such as oily and humid workshops.

[0058] In some optional examples of this embodiment, the upper surface of the lifting bracket 31 is provided with anti-slip texture. The anti-slip texture can be a diamond pattern, horizontal stripes, or a grid pattern, which further increases the friction between the lifting bracket 31 and the flange 102 of the square turnover box 1, preventing relative sliding of the square turnover box 1 during transportation and improving the anti-slip effect. In some optional examples of this embodiment, the outer surface of the foot pedal crossbar 112 is wrapped with an anti-slip rubber sleeve to prevent the operator from slipping when stepping on it, improving operational safety; at the same time, the two ends of the reinforcing support rod 113 are fixedly connected to the left and right ends of the foot pedal crossbar 112 and the left and right side beams of the bearing base frame 2, respectively, forming a symmetrical double support rod structure, which further improves the structural strength and deformation resistance of the foot pedal stabilizing assembly 11. In some alternative examples of this embodiment, the outer surface of the handle 53 is provided with an anti-slip structure, which may be an anti-slip texture, an anti-slip rubber sleeve, or an anti-slip protrusion, to adapt to oily and humid workshop conditions and prevent the operator from slipping when holding it; at the same time, the two ends of the handle 53 are provided with limiting end caps to prevent the hand from slipping off the two ends of the handle 53 when holding it, further improving the safety of operation.

[0059] Example 2:

[0060] A method for using a lever-lifting and transporting trolley for turnover boxes, this embodiment is based on the lever-lifting and transporting trolley for turnover boxes described in Embodiment 1, specifically including the following steps: S1. Lowering and alignment: Push the handle 53 of the control lever 5 counterclockwise, so that the control lever 5 rotates counterclockwise around its hinge fulcrum with the first mounting rod 71, and drives the lifting fork 3 to fall vertically toward the supporting base frame 2 through the second connecting block 8, until the lower surface of the second hinge plate 62 of the first connecting block 6 is completely in contact with the upper surface of the horizontal baffle 41 on the front wheel seat, completing the lower limit limit of the lifting fork 3; at this time, the opening of the transport trolley is oriented toward the square turnover box 1 with flange 102 to be transported, and the trolley is pushed horizontally, so that the fork arm of the lifting fork 3 is completely inserted below the flange 102 of the square turnover box 1, ensuring that the lifting bracket 31 and the lower surface of the flange 102 of the square turnover box 1 are directly in contact, completing the alignment operation.

[0061] S2. Lifting Self-Locking: Pull the handle 53 of the control lever 5 clockwise, causing the control lever 5 to rotate clockwise around its hinge point with the first mounting rod 71. This drives the lifting fork 3 to lift vertically upwards via the second connecting block 8, and the square turnover box 1 lifts synchronously with the lifting fork 3, with its bottom leaving the ground. Continue pulling the control lever 5 until the rear surface of the first segment 51 of the control lever 5 abuts against the limiting post 9 on the first mounting rod 71, stopping the rotation of the control lever 5 and allowing the lifting fork 3 to reach its highest lifting position. At this time, the gravity of the square turnover box 1 acts vertically downwards on the lifting fork 3 and is transmitted to the first segment 51 through the lifting fork 3 and the second connecting block 8, causing the first segment 51 to continuously press against the limiting post 9 to form a gravity self-lock, completing the lifting and locking of the square turnover box 1. The lifting state can be maintained without the operator continuously holding the control lever 5.

[0062] S3. Transfer and Unloading: The operator holds the handle 53 of the control lever 5 and pushes the transfer trolley, moving the locked square turnover box 1 to the target unloading position. After reaching the position, the operator pushes the handle 53 of the control lever 5 counterclockwise, causing the first segment 51 to disengage from the limit post 9 and release the self-locking. While the control lever 5 rotates counterclockwise, it drives the lifting fork 3 to fall vertically through the second connecting block 8 until the bottom of the square turnover box 1 is completely in contact with the ground and the lifting fork 3 separates from the flange 102 of the square turnover box 1. Finally, the operator pulls the transfer trolley horizontally, causing the lifting fork 3 to be pulled out from under the flange 102 of the square turnover box 1, completing the transfer and unloading operation of the square turnover box 1.

[0063] Those skilled in the art will recognize that numerous variations are possible with respect to the above description, and the embodiments and figures are merely for describing one or more specific implementations.

[0064] Although exemplary embodiments of the invention have been described and illustrated, those skilled in the art will understand that various changes and substitutions can be made thereto without departing from the spirit of the invention. Furthermore, many modifications can be made to adapt specific situations to the doctrine of the invention without departing from the central concepts of the invention described herein. Therefore, the invention is not limited to the specific embodiments disclosed herein, but may include all embodiments and equivalents that fall within the scope of the invention.

Claims

1. A lever-lifting and transfer trolley for transporting square turnover boxes with flanges, the square turnover box comprising a square frame and a flange disposed on the upper part of the square frame, characterized in that: Includes a load-bearing underframe, lifting forks, several wheels, and control levers; Both the support base and the lifting fork are C-shaped frames with openings on the front. The lifting fork is parallel to and movably disposed above the support base, and the openings of the support base and the lifting fork correspond front to back. The two sides of the lifting fork frame and the two sides of the bearing base frame are hinged by multiple sets of first connecting blocks; the first connecting block has an angled structure, including a first hinge plate and a second hinge plate set at a fixed angle, the first hinge plate is hinged to the lifting fork frame, and the second hinge plate is hinged to the bearing base frame. The wheels are mounted on the support base frame via wheel seats, wherein two wheel seats near the opening are fixed to the bottom of the support base frame, and horizontal baffles are fixed on the two wheel seats. The horizontal baffles are used to fit and limit the second hinge plate to restrict the extreme position of the lifting fork frame falling toward the support base frame. The support base is fixedly provided with a joystick mounting seat at one end away from the opening. The joystick mounting seat includes a horizontally arranged first mounting rod. The lower end of the joystick is hinged to the first mounting rod. The hinge fulcrum of the joystick and the first mounting rod is independent of all hinge axes of the first connecting block and the support base and the lifting fork frame. The control lever includes a first segment and a second segment. The second segment is connected to the upper end of the first segment at a fixed angle, and the second segment is located on the side of the first segment away from the supporting base. The first segment is hinged to the end of the lifting fork away from the opening via a second connecting block. A limiting post is fixedly provided on the first mounting rod. The limiting post is located on the side of the first rod segment away from the supporting base frame. The limiting post is used to limit the maximum travel of the first rod segment in the direction away from the supporting base frame, so as to limit the highest lifting position of the lifting fork. When the first rod segment abuts against the limiting post, the weight of the square turnover box is transmitted to the first rod segment through the lifting fork and the second connecting block, so that the first rod segment continuously presses against the limiting post to form a gravity self-locking.

2. The turnover box lever lifting and transfer trolley according to claim 1, characterized in that: The supporting base, lifting fork and control lever are all made of round tubular profiles. Corresponding components are connected by connecting joints and locked in place by bolts.

3. The turnover box lever lifting and transfer trolley according to claim 1, characterized in that: The lifting fork is equipped with a lifting support.

4. The turnover box lever lifting and transfer trolley according to claim 1, characterized in that: The first connecting block is a one-piece molded structure, and the first hinge plate and the second hinge plate are combined to form " "shape.

5. The turnover box lever lifting and transfer trolley according to claim 1, characterized in that: The supporting frame extends rearward from the end away from the opening and is provided with a wheel assembly mounting rod. Two wheels on the side away from the opening are mounted on the wheel assembly mounting rod via wheel seats.

6. The turnover box lever lifting and transfer trolley according to claim 5, characterized in that: The two wheels mounted on the wheel assembly mounting rod are swivel wheels.

7. The turnover box lever lifting and transfer trolley according to claim 1, characterized in that: The extension direction of the first mounting rod is perpendicular to the extension direction of the side beam at the end of the supporting base away from the opening.

8. The turnover box lever lifting and transfer trolley according to claim 7, characterized in that: The end of the first mounting rod away from the supporting base is provided with a foot pedal stabilizing assembly; the foot pedal stabilizing assembly includes a vertical connecting rod, a foot pedal crossbar, and a reinforcing support rod. The vertical connecting rod is fixed vertically to the end of the first mounting rod away from the supporting base, and the foot pedal crossbar is fixed horizontally to the end of the vertical connecting rod away from the first mounting rod. The top surface of the foot pedal crossbar is lower than the bottom surface of the supporting base, and the reinforcing support rod connects the foot pedal crossbar and the supporting base.

9. The turnover box lever lifting and transfer trolley according to claim 1, characterized in that: The joystick also includes a horizontally arranged handle, which is located at the top of the second segment.

10. A method of using a lever-lifting and transfer trolley for turnover boxes, based on the lever-lifting and transfer trolley for turnover boxes as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Lowering and positioning: Push the control lever counterclockwise to lower the lifting fork towards the supporting base frame until the second hinge plate of the first connecting block is in contact with the horizontal baffle on the wheel seat and is limited. Orient the opening of the transfer trolley towards the turnover box to be transported, and push the trolley to insert the lifting fork under the flange of the turnover box. S2. Lifting Self-Locking: Pull the control lever clockwise to rotate it around the hinge point with the first mounting rod. This will drive the lifting fork to lift vertically upwards through the second connecting block until the first segment of the control lever abuts against the limit post. At this time, the weight of the turnover box is transmitted to the first segment through the lifting fork and the second connecting block, causing the first segment to continuously press against the limit post to form a gravity self-lock, thus completing the lifting and locking of the turnover box. S3. Transfer and unloading: Push the control lever to move the transfer trolley to the target position, push the control lever counterclockwise to release the self-locking mechanism, so that the lifting fork falls down to separate from the flange of the turnover box, and pull out the transfer trolley to complete the unloading.

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