Lightweight forklift frame structure

Abstract

The utility model discloses a light-weight forklift frame structure which comprises a top frame, the top frame is composed of a front supporting frame, a rear supporting frame and an arch-shaped top frame, the inner wall of the arch-shaped top frame is fixedly connected with a hollow transverse pipe, the front portion of the front supporting frame is fixedly connected with two first supporting columns, and the rear supporting frame is fixedly connected with two second supporting columns. The rear portion of the rear supporting frame is fixedly connected with two second supporting columns. By adopting various lightweight design means such as arranging the hollow transverse pipes on the inner wall of the arched top frame and arranging the protective net with light high-strength fiber composite materials, energy consumption is effectively reduced, the endurance of the electric forklift is improved, the influence of the weight of the forklift frame on gravity center distribution is reduced, and the forklift is flexible to control, high in stability, suitable for complex environments and high in practicability. And the four lifting mechanisms can drive the protective net to vertically ascend and descend, the visual field of the grid structure is good, the protective effect is good, impact force can be dispersed, the damage risk is reduced, reliable protection is provided for personnel and key parts, and the safety and applicability of operation are enhanced.

Description

Technical Field

[0001] This utility model relates to the field of forklift technology, and in particular to a lightweight forklift frame structure. Background Technology

[0002] In the modern logistics and warehousing industry, forklifts are important cargo handling equipment, and their performance and safety directly affect the efficiency and quality of logistics operations.

[0003] Traditional forklift chassis top frames are typically made from a single piece of metal or plastic sheet. To ensure sufficient strength and protection, thicker sheets are required, resulting in a heavier top frame. This heavier top frame not only increases the forklift's energy consumption and reduces the electric forklift's range, but also alters the forklift's center of gravity, affecting its stability and maneuverability during travel and operation. Furthermore, traditional top frames offer poor visibility, limited protection against small particles or irregularly shaped objects, and are inconvenient to install and disassemble, making them difficult to adapt to the needs of different operating environments.

[0004] As the logistics industry increasingly demands lighter, more efficient, and more multifunctional equipment, there is an urgent need for a new type of lightweight forklift frame structure to reduce frame weight and improve overall forklift performance while ensuring safety and protection.

[0005] Therefore, we propose a lightweight forklift frame structure. Utility Model Content

[0006] The main objective of this utility model is to provide a lightweight forklift frame structure. This structure aims to prevent problems such as increased forklift energy consumption, reduced electric forklift range, altered center of gravity affecting stability and maneuverability due to excessive weight of the top frame, as well as the poor visibility, limited protection, and inconvenient installation and disassembly of traditional top frames. The goal is to improve the forklift's operating efficiency, safety, and adaptability to different operating environments, while simultaneously reducing operating costs. This meets the modern logistics industry's demand for lightweight, efficient, and multifunctional equipment, effectively solving the problems in the background technology.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A lightweight forklift frame structure includes a top frame, which is composed of a front support frame, a rear support frame, and an arched top frame, wherein a hollow horizontal tube is fixedly connected to the inner wall of the arched top frame.

[0009] The front support frame is fixedly connected to two first support columns, and the rear support frame is fixedly connected to two second support columns. Each pair of first and second support columns is vertically equipped with a lifting mechanism at its top, and the lifting mechanisms are arranged opposite to each other. A protective net is connected between the four lifting mechanisms.

[0010] By adopting the above technical solution, the front support frame and the rear support frame are the basic support parts of the entire top frame. They are connected to the forklift body and transfer the weight of the top frame and the external load it bears to the forklift chassis, ensuring the stability of the top frame during forklift travel and operation.

[0011] The arched roof frame design can better distribute the pressure from above. The arched structure has good mechanical properties and can distribute the vertical force along the arch curve to the front and rear support frames, thereby improving the overall load-bearing capacity of the roof frame. At the same time, the hollow horizontal tubes on the inner wall of the arched roof frame play a role in strengthening the strength and rigidity of the roof frame. The hollow design reduces weight while ensuring strength, which meets the requirements of lightweight design.

[0012] Protective netting tends to use lightweight, high-strength materials, such as fiber composites like aramid fiber. Aramid fiber has a low density and is lightweight, reducing the overall weight when weaving the netting. At the same time, these materials have high strength, allowing for the use of finer fibers to meet protective performance requirements, thus reducing weight. The netting uses its mesh structure to block falling objects. Furthermore, the netting material itself has a degree of elasticity; when impacted, it can undergo elastic deformation to some extent, buffering some of the impact force. Additionally, the mesh structure disperses the impact force over a larger area, reducing the risk of damage caused by excessive localized pressure.

[0013] Compared to traditional roof racks, which mainly provide protection through solid panels such as metal or plastic sheets, and whose protection against falling objects relies on the strength of the panels and the stability of the overall structure, protective nets use a mesh structure to block objects. They can provide better visibility while ensuring protection. Protective nets may be more advantageous for protecting against small particles or irregularly shaped objects.

[0014] Traditional top frames are usually made of a single piece of material. To ensure sufficient strength and protective area, thicker plates are required. However, the lightweight design of the protective net gives it a significant advantage in weight. This greatly improves the forklift's handling performance, energy consumption, and especially the range of electric forklifts. The lightweight design of the protective net is also reflected in its structural flexibility. Due to its light weight, it is relatively easy to install and disassemble, and it has less impact on the overall center of gravity of the forklift. In contrast, traditional top frames are heavier, and the installation process may require more manpower and resources. Furthermore, its weight may change the center of gravity distribution of the forklift, affecting its stability and maneuverability to some extent.

[0015] Four lifting mechanisms are respectively installed on the top of the first and second support columns and are arranged opposite each other. The lifting mechanisms can drive the protective net to move vertically up and down. When the forklift does not need the protective net, the lifting mechanism can lower the protective net to reduce space occupation and facilitate the forklift to drive and operate in some space-constrained environments. When the forklift enters an area where there may be a risk of objects falling from above, such as when working under warehouse shelves, the lifting mechanism is activated to raise the protective net. The protective net can block goods, debris, etc. falling from above, and provide protection for forklift operators and critical components.

[0016] Furthermore, the bottom end of the arched top frame is fixedly connected to the top end of the front support frame and the rear support frame, respectively.

[0017] By adopting the above technical solution, when the forklift is operating normally or during operation, the arched top frame will bear its own weight, the weight of equipment that may be placed on it, and various external loads such as wind loads during outdoor operations and possible cargo collisions during warehouse operations. The fixed connection between the bottom end of the arched top frame and the top of the front and rear support frames allows these forces to be effectively transferred to the support frames. Due to the characteristics of the arched structure, the force will be distributed along the curve of the arched top frame to the connection points at both ends, namely the front and rear support frames. This dispersion effect is similar to the arched structure of a bridge, which can disperse concentrated forces into pressure along the axial direction of the structure, thereby reducing local stress concentration. This allows the entire top frame structure to withstand greater loads. The fixed connection ensures that the arched top frame, the front support frame, and the rear support frame form a stable overall structure. This connection method limits the relative displacement between the various components and enhances the rigidity of the top frame structure. During forklift operation, especially on uneven roads or during loading and unloading operations, the forklift will vibrate and shake. Through the strong fixed connection, the arched top frame and the support frame can work together to resist these deformations and shaking, maintaining the stability of the top frame structure. This provides a stable support environment for the normal operation of the forklift and also ensures that other equipment installed on the top frame, such as protective nets and lighting equipment, can work normally.

[0018] Furthermore, the hollow horizontal tubes are arranged in multiple sets at equal intervals along the direction of the arched top frame.

[0019] By adopting the above technical solution, when a vertical load such as the weight of goods, the weight of equipment, or an external impact acts on the arched top frame, multiple sets of equidistantly arranged hollow horizontal tubes can disperse these loads along the length of the arched top frame, just like adding multiple lateral support points in the arched structure, so that the force originally concentrated in certain parts can be evenly distributed on the entire arched top frame, avoiding deformation or damage to local areas due to excessive pressure.

[0020] Hollow horizontal tubes can effectively improve the bending stiffness of arched top frames. From a mechanical point of view, the presence of horizontal tubes increases the moment of inertia of the top frame in the lateral direction, thereby enhancing its ability to resist bending deformation. For example, when a forklift encounters bumps or lateral forces while driving, hollow horizontal tubes can prevent the arched top frame from bending excessively, ensuring the stability of the top frame structure.

[0021] The hollow horizontal tube adopts a hollow design, which achieves lightweighting while ensuring structural strength. Compared with solid tubes, the hollow structure can effectively resist deformation when subjected to axial pressure and bending force by utilizing the annular cross section of the tube. This design utilizes the principles of material mechanics, which allows the tube to use less material under the same load, thereby reducing the overall weight of the top frame.

[0022] Multiple sets of equidistant hollow horizontal tubes can achieve efficient use of materials while ensuring the overall performance of the top frame. Through reasonable spacing, each hollow horizontal tube can play a role in reinforcing the structure within its effective range, avoiding excessive or redundant use of materials. This layout not only meets the requirements of structural strength, but also avoids adding unnecessary weight due to excessive material accumulation.

[0023] Multiple sets of hollow horizontal tubes and arched top frames work together to form a coordinated whole structure. The arched top frame provides the installation foundation and main force transmission path for the hollow horizontal tubes, while the hollow horizontal tubes, in turn, enhance the load-bearing capacity and stability of the arched top frame. The connections between them are tight and stable, and together they resist loads from all directions, ensuring that the top frame can work normally under various forklift operating conditions, such as lifting goods and traveling on uneven roads.

[0024] Furthermore, the lifting mechanism includes a fixed cylinder, and a movable rod is slidably connected inside the fixed cylinder.

[0025] By adopting the above technical solution, the fixed cylinder serves as the guide and support structure for the moving rod. When the protective net needs to be raised, an external force is applied to the moving rod, causing it to slide upward along the inner wall of the fixed cylinder. The inner wall of the fixed cylinder and the outer wall of the moving rod have good fit precision, ensuring that the moving rod can slide smoothly while preventing excessive swaying. This sliding connection method is similar to the movement of a piston in a cylinder, enabling precise linear movement and effectively controlling the lifting height of the protective net.

[0026] During the raising of the protective net, the moving rod bears the weight of the net and other external forces that may be applied to it, such as the impact force of goods and wind load. The moving rod transmits these forces to the fixed cylinder, which then distributes the forces to the first and second support columns of the forklift, and finally to the frame structure of the forklift. This force transmission path ensures the stability and safety of the protective net during and after raising. At the same time, the structural design of the fixed cylinder and the moving rod needs to be able to withstand these forces without damage.

[0027] Furthermore, a fixing head is fixedly connected to the upper outer side of the movable rod, and a connecting ring is fixedly connected to the fixing head, the connecting ring being connected to the protective net.

[0028] By adopting the above technical solution, the fixed head and the connecting ring constitute the connecting parts between the protective net and the moving rod. By connecting the connecting ring to the protective net, the protective net can be tightly connected to the moving rod. This connection method ensures that the protective net can move synchronously with the moving rod during the lifting process. When the protective net is subjected to external loads such as the impact of objects falling from above or wind loads, the force is first applied to the protective net. Since the connecting ring is connected to the protective net, the force will be transmitted to the fixed head through the connecting ring, and then to the moving rod through the fixed head. As the main force-bearing component, the moving rod further transmits the force to the fixed cylinder and the entire support structure of the forklift, thereby ensuring that the protective net can stably withstand external loads, and that the entire lifting mechanism can effectively share the force on the protective net.

[0029] The connecting ring acts as a link between the protective net and the moving rod, ensuring that the movement of the protective net and the moving rod are synchronized. When the moving rod of the lifting mechanism slides upward, the protective net will also unfold upward through the drive of the connecting ring; when the moving rod slides downward, the protective net will also descend and retract synchronously. This synchronized movement mechanism ensures that the position of the protective net can be adjusted in a timely and accurate manner according to the actual operating needs of the forklift, such as the need to raise or lower the protective net in different working environments.

[0030] Furthermore, the movable rod has multiple sets of equally spaced threaded holes vertically on its outer side, and the fixed cylinder has a threaded through hole on its upper outer side near the threaded holes for connection with a bolt. One end of the bolt passes through the threaded through hole and is threadedly connected to the threaded hole.

[0031] By adopting the above technical solution, multiple sets of equidistant threaded holes vertically opened on the outer side of the movable rod provide multiple selectable positions for adjusting the height of the protective net. Operators can slide the movable rod to a suitable height within the fixed cylinder according to the needs of the actual work scenario, such as the height of the goods or limitations of the workspace. The threaded through holes on the fixed cylinder cooperate with bolts. When the movable rod reaches the predetermined height, the bolt is passed through the threaded through holes of the fixed cylinder and screwed into the corresponding threaded holes of the movable rod. In this way, the bolt firmly connects the movable rod and the fixed cylinder together, thereby fixing the protective net at the required height. The threaded connection has a self-locking characteristic; once the bolt is screwed into the threaded hole, it remains locked without external force. When in use, the bolts will not loosen on their own. This is because the friction between the threads and the helix angle of the threads work together to allow the bolts to resist the weight of the protective net itself and potential external impacts such as wind or cargo collisions. This prevents the moving rod from sliding inside the fixed cylinder and ensures that the protective net is stably maintained at the set height. The design of multiple sets of equally spaced threaded holes provides high flexibility and adaptability. Different working scenarios may require the protective net to be at different heights. By selecting different threaded holes to match the bolts, the height of the protective net can be easily adjusted. This design allows the forklift's protective net to adapt to various working environments, improving the forklift's versatility and practicality.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) This utility model provides a lightweight forklift frame structure. The forklift frame structure adopts a variety of lightweight design methods, such as hollow horizontal tubes set in the inner wall of the arched top frame, which reduces weight while ensuring strength; the protective net is made of lightweight and high-strength fiber composite material, which significantly reduces weight compared with the traditional solid plate top frame. The lightweight design effectively reduces the energy consumption of the forklift, improves the range of electric forklifts, and reduces the impact of frame weight on the center of gravity distribution of the forklift, making the forklift more flexible to operate and more stable during driving and operation. It is especially suitable for operation in complex environments such as warehouse racks with limited space.

[0034] (2) This utility model provides a lightweight forklift frame structure. Four lifting mechanisms can drive the protective net to move vertically. When the forklift is operating in an area where there is no danger of objects falling from above, the protective net can be lowered to reduce space occupation. When entering dangerous areas such as under warehouse shelves, the protective net can be quickly raised. The mesh structure of the protective net can not only effectively block falling objects, but also has a good field of vision. It has a better protective effect on small particles or irregularly shaped objects. In addition, the elasticity of its material and the mesh structure can disperse the impact force and reduce the risk of damage to the protective net. It provides reliable protection for forklift operators and key components, and significantly enhances the safety and applicability of forklift operation. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a lightweight forklift frame structure according to the present invention.

[0036] Figure 2 This is a schematic diagram of the arched top frame structure of a lightweight forklift frame structure according to this utility model.

[0037] Figure 3 This is a schematic diagram of the lifting mechanism of a lightweight forklift frame structure according to the present invention.

[0038] In the diagram: 1. Front support frame; 2. Rear support frame; 3. Arched top frame; 4. Hollow horizontal tube; 5. First support column; 6. Second support column; 7. Lifting mechanism; 8. Protective net; 9. Fixed cylinder; 10. Moving rod; 11. Fixed head; 12. Connecting ring; 13. Threaded hole; 14. Bolt. Detailed Implementation

[0039] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0040] To prevent increased forklift energy consumption, reduced electric forklift range, and altered center of gravity affecting stability and maneuverability due to excessive weight of the top frame, as well as the problems of poor visibility, limited protection, and inconvenient installation and disassembly associated with traditional top frames, this design aims to improve forklift operating efficiency, safety, and adaptability to different operating environments, while simultaneously reducing operating costs and meeting the modern logistics industry's demands for lightweight, efficient, and multifunctional equipment. Figure 1 , Figure 2 , Figure 3 As shown, a lightweight forklift frame structure includes a top frame, which is composed of a front support frame 1, a rear support frame 2 and an arched top frame 3. A hollow horizontal tube 4 is fixedly connected to the inner wall of the arched top frame 3.

[0041] The front support frame 1 is fixedly connected to two first support columns 5, and the rear support frame 2 is fixedly connected to two second support columns 6. Each pair of first support columns 5 and second support columns 6 is vertically provided with a lifting mechanism 7 at its top, and the lifting mechanisms 7 are arranged opposite to each other. A protective net 8 is connected between the four lifting mechanisms 7.

[0042] When in use, the front support frame 1 and the rear support frame 2 are the basic support parts of the entire top frame. They are connected to the forklift body and transfer the weight of the top frame and the external load it bears to the forklift chassis, ensuring the stability of the top frame during forklift travel and operation.

[0043] The design of the arched top frame 3 can better distribute the pressure from above. The arched structure has good mechanical properties and can distribute the vertical force along the arched curve to the front support frame 1 and the rear support frame 2, thereby improving the overall load-bearing capacity of the top frame. At the same time, the hollow horizontal tube 4 on the inner wall of the arched top frame 3 plays a role in strengthening the strength and rigidity of the top frame. The hollow design reduces the weight while ensuring strength, which meets the requirements of lightweight design.

[0044] Protective netting tends to use lightweight, high-strength materials, such as fiber composites like aramid fiber. Aramid fiber has a low density and is lightweight, reducing the overall weight when weaving the netting. At the same time, these materials have high strength, allowing for the use of finer fibers to meet protective performance requirements, thus reducing weight. The netting uses its mesh structure to block falling objects. Furthermore, the netting material itself has a degree of elasticity; when impacted, it can undergo elastic deformation to some extent, buffering some of the impact force. Additionally, the mesh structure disperses the impact force over a larger area, reducing the risk of damage caused by excessive localized pressure.

[0045] Compared to traditional roof racks, which mainly provide protection through solid panels such as metal or plastic sheets, and whose protection against falling objects relies on the strength of the panels and the stability of the overall structure, protective nets use a mesh structure to block objects. They can provide better visibility while ensuring protection. Protective nets may be more advantageous for protecting against small particles or irregularly shaped objects.

[0046] Traditional top frames are usually made of a single piece of material. To ensure sufficient strength and protective area, thicker plates are required. However, the lightweight design of the protective net gives it a significant advantage in weight. This greatly improves the forklift's handling performance, energy consumption, and especially the range of electric forklifts. The lightweight design of the protective net is also reflected in its structural flexibility. Due to its light weight, it is relatively easy to install and disassemble, and it has less impact on the overall center of gravity of the forklift. In contrast, traditional top frames are heavier, and the installation process may require more manpower and resources. Furthermore, its weight may change the center of gravity distribution of the forklift, affecting its stability and maneuverability to some extent.

[0047] Four lifting mechanisms 7 are respectively installed on the top of the first support column 5 and the second support column 6, and are arranged opposite each other. The lifting mechanism 7 can drive the protective net 8 to move vertically. When the forklift does not need the protective net 8 for protection, the lifting mechanism 7 can lower the protective net 8 to reduce space occupation and facilitate the forklift to drive and operate in some space-constrained environments. When the forklift enters an area where there may be a risk of objects falling from above, such as when working under warehouse shelves, the lifting mechanism 7 is activated to raise the protective net 8. The protective net 8 can block goods, debris, etc. falling from above, and provide protection for forklift operators and key components.

[0048] For example, such as Figure 1 As shown, the present invention also includes that the bottom end of the arched top frame 3 is fixedly connected to the top ends of the front support frame 1 and the rear support frame 2 respectively.

[0049] During use, when the forklift is running normally or in operation, the arched top frame 3 will bear its own weight, the weight of equipment that may be placed on it, and various external loads such as wind loads during outdoor operations and possible cargo collisions during warehouse operations. The fixed connection between the bottom end of the arched top frame 3 and the top ends of the front support frame 1 and the rear support frame 2 allows these forces to be effectively transferred to the support frames. Due to the characteristics of the arched structure, the force will be distributed along the curve of the arched top frame 3 to the connection points at both ends, namely the front support frame 1 and the rear support frame 2. This dispersion effect is similar to the arched structure of a bridge, which can disperse concentrated forces into pressure along the axial direction of the structure, thereby reducing local stress concentration and making... The entire top frame structure can withstand greater loads. The fixed connection ensures that the arched top frame 3, the front support frame 1, and the rear support frame 2 form a stable overall structure. This connection method limits the relative displacement between the various components and enhances the rigidity of the top frame structure. During forklift operation, especially on uneven roads or when loading and unloading goods, the forklift will vibrate and shake. Through the firm fixed connection, the arched top frame 3 and the support frame can work together to resist these deformations and shaking, maintain the stability of the top frame structure, and thus provide a stable support environment for the normal operation of the forklift. At the same time, it also ensures that other equipment installed on the top frame, such as protective nets and lighting equipment, can work normally.

[0050] For example, such as Figure 1 , Figure 2 As shown, this utility model also includes multiple sets of hollow horizontal tubes 4 arranged at equal intervals along the direction of the arched top frame 3.

[0051] When in use, when a vertical load such as the weight of goods, equipment, or external impact is applied to the arched top frame 3, multiple sets of equidistantly arranged hollow horizontal tubes 4 can distribute these loads along the length of the arched top frame 3, just like adding multiple lateral support points to the arched structure, so that the force originally concentrated in certain parts can be evenly distributed to the entire arched top frame 3, avoiding deformation or damage to local areas due to excessive pressure.

[0052] The hollow horizontal tube 4 can effectively improve the bending stiffness of the arched top frame 3. From a mechanical point of view, the presence of the horizontal tube increases the moment of inertia of the top frame in the lateral direction, thereby enhancing its ability to resist bending deformation. For example, when the forklift encounters bumps or lateral forces during travel, the hollow horizontal tube 4 can prevent the arched top frame 3 from bending excessively, ensuring the stability of the top frame structure.

[0053] Hollow horizontal tube 4 adopts a hollow design, which achieves lightweighting while ensuring structural strength. Compared with solid tubes, hollow structures can effectively resist deformation when subjected to axial pressure and bending force by utilizing the annular cross section of the tube. This design utilizes the principles of material mechanics, enabling the tube to use less material under the same load, thereby reducing the overall weight of the top frame.

[0054] Multiple sets of equidistant hollow horizontal tubes 4 can achieve efficient use of materials while ensuring the overall performance of the top frame. Through reasonable spacing, each hollow horizontal tube 4 can play a role in reinforcing the structure within its effective range, avoiding excessive use or redundancy of materials. This layout not only meets the requirements of structural strength, but also does not add unnecessary weight due to excessive material accumulation.

[0055] Multiple sets of hollow horizontal tubes 4 and arched top frame 3 work together to form a coordinated whole structure. The arched top frame 3 provides the installation foundation and main force transmission path for the hollow horizontal tubes 4, while the hollow horizontal tubes 4 in turn enhance the load-bearing capacity and stability of the arched top frame 3. The connection between them is tight and solid, and they jointly resist loads from all directions, ensuring that the top frame can work normally under various forklift operating conditions such as lifting goods and traveling on uneven roads.

[0056] For example, such as Figure 1 , Figure 3 As shown, the present invention also includes a lifting mechanism 7 comprising a fixed cylinder 9, wherein a movable rod 10 is slidably connected inside the fixed cylinder 9.

[0057] In use, the fixed cylinder 9 serves as a guide and support structure for the moving rod 10. When the protective net 8 needs to be raised, an external force is applied to the moving rod 10, causing the moving rod 10 to slide upward along the inner wall of the fixed cylinder 9. The inner wall of the fixed cylinder 9 and the outer wall of the moving rod 10 have good fit precision, ensuring that the moving rod 10 can slide smoothly while preventing excessive shaking. This sliding connection method is similar to the movement of a piston in a cylinder, which can achieve precise linear movement and thus effectively control the lifting height of the protective net 8.

[0058] During the raising of the protective net 8, the moving rod 10 bears the weight of the protective net 8 as well as other external forces that may be applied to the protective net 8, such as the impact force of the goods and wind load. The moving rod 10 transmits these forces to the fixed cylinder 9, which then distributes the forces to the first support column 5 and the second support column 6 of the forklift, and finally to the frame structure of the forklift. This force transmission path ensures the stability and safety of the protective net 8 during the raising and lowering process and after it is raised. At the same time, the structural design of the fixed cylinder 9 and the moving rod 10 needs to be able to withstand these forces without damage.

[0059] For example, such as Figure 1 , Figure 3 As shown, the present invention also includes a fixed head 11 fixedly connected to the upper outer side of the movable rod 10, and a connecting ring 12 fixedly connected to the fixed head 11, the connecting ring 12 being connected to the protective net 8.

[0060] In use, the fixed head 11 and the connecting ring 12 constitute the connecting parts between the protective net 8 and the moving rod 10. By connecting the connecting ring 12 to the protective net 8, the protective net 8 can be tightly connected to the moving rod 10. This connection method ensures that the protective net 8 can move synchronously with the moving rod 10 during the lifting process. When the protective net 8 is subjected to external loads such as the impact of objects falling from above or wind loads, the force is first applied to the protective net 8. Since the connecting ring 12 is connected to the protective net 8, the force will be transmitted to the fixed head 11 through the connecting ring 12, and then to the moving rod 10 through the fixed head 11. The moving rod 10, as the main force-bearing component, further transmits the force to the fixed cylinder 9 and the entire support structure of the forklift, thereby ensuring that the protective net 8 can stably bear the external load, and the entire lifting mechanism 7 can effectively share the force on the protective net 8.

[0061] The connecting ring 12 serves as the link between the protective net 8 and the moving rod 10, ensuring that the movement of the protective net 8 is synchronized with the movement of the moving rod 10. When the moving rod 10 of the lifting mechanism 7 slides upward, the protective net 8 will also unfold upward through the drive of the connecting ring 12; when the moving rod 10 slides downward, the protective net 8 will also descend and retract synchronously. This synchronous movement mechanism ensures that the protective net 8 can adjust its position in a timely and accurate manner according to the actual operating needs of the forklift, such as the need for the protective net 8 to rise or fall in different working environments.

[0062] For example, such as Figure 1 , Figure 3 As shown, the present invention also includes a plurality of equally spaced threaded holes 13 vertically opened on the outer side of the movable rod 10, and a threaded through hole connected to a bolt 14 is opened on the upper outer side of the fixed cylinder 9 near the threaded holes 13. One end of the bolt 14 passes through the threaded through hole and is threadedly connected to the threaded hole 13.

[0063] In use, the multiple sets of equidistant threaded holes 13 vertically opened on the outer side of the movable rod 10 provide multiple selectable positions for adjusting the height of the protective net 8. Operators can slide the movable rod 10 to a suitable height within the fixed cylinder 9 according to the needs of the actual work scenario, such as the height of the goods or limitations of the workspace. The threaded through holes on the fixed cylinder 9 cooperate with the bolts 14. When the movable rod 10 reaches the predetermined height, the bolts 14 are passed through the threaded through holes of the fixed cylinder 9 and screwed into the corresponding threaded holes 13 of the movable rod 10. In this way, the bolts 14 firmly connect the movable rod 10 and the fixed cylinder 9 together, thereby fixing the protective net 8 at the required height. The threaded connection has a self-locking characteristic; once the bolts 14 are screwed into the threaded holes 13, they remain locked in place. Under external force, bolt 14 will not loosen on its own. This is because the friction between the threads and the helix angle of the threads work together to make bolt 14 resist the weight of the protective net 8 itself and the external impact forces that may be received, such as wind force and cargo collisions. This prevents the moving rod 10 from sliding in the fixed cylinder 9 and ensures that the protective net 8 is stably maintained at the set height position. The design of multiple sets of equally spaced threaded holes 13 provides high flexibility and adaptability. Different working scenarios may require the protective net 8 to be at different heights. By selecting different threaded holes 13 to cooperate with bolt 14, the height of the protective net 8 can be easily adjusted. This design enables the forklift's protective net 8 to adapt to a variety of working environments, improving the versatility and practicality of the forklift.

[0064] It should be noted that this utility model is a lightweight forklift frame structure. The bottom end of the arched top frame 3 is fixedly connected to the top end of the front support frame 1 and the rear support frame 2 to form a stable top frame structure. Hollow horizontal tubes 4 are arranged and fixed at equal intervals along the direction of the arched top frame 3. The fixing cylinder 9 is fixed to the top of the first support column 5 and the second support column 6. The moving rod 10 is slidably connected to the inside of the fixing cylinder 9. A fixing head 11 and a connecting ring 12 are installed on the upper part of the outer side of the moving rod 10, and the connecting ring 12 is connected to the protective net 8.

[0065] When a forklift enters an area where there is a risk of objects falling from above, an external force is applied to the moving rod 10 to make it slide upward along the inner wall of the fixed cylinder 9, thereby raising the protective net 8 to block goods, debris, etc. falling from above.

[0066] When the forklift does not require the protection of the safety net 8, the moving rod 10 slides down along the inner wall of the fixed cylinder 9 to reduce the height of the safety net 8, reduce space occupation, and facilitate driving and operation in space-constrained environments.

[0067] Depending on the actual working scenario, such as cargo height or space constraints, slide the movable rod 10 to a suitable height inside the fixed cylinder 9, then pass the bolt 14 through the threaded through hole on the fixed cylinder 9 and screw it into the corresponding threaded hole 13 of the movable rod 10 to fix the protective net 8 at the required height.

[0068] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A lightweight forklift frame structure, including a top frame, characterized in that, The top frame consists of a front support frame (1), a rear support frame (2) and an arched top frame (3), and the inner wall of the arched top frame (3) is fixedly connected with a hollow horizontal tube (4); The front support frame (1) is fixedly connected to two first support columns (5), and the rear support frame (2) is fixedly connected to two second support columns (6). The top of each pair of first support columns (5) and second support columns (6) is provided with a vertical lifting mechanism (7), and the two lifting mechanisms (7) are arranged opposite to each other. A protective net (8) is connected between the four lifting mechanisms (7).

2. The lightweight forklift frame structure according to claim 1, characterized in that: The bottom end of the arched top frame (3) is fixedly connected to the top end of the front support frame (1) and the rear support frame (2), respectively.

3. The lightweight forklift frame structure according to claim 1, characterized in that: The hollow horizontal tubes (4) are arranged in multiple sets at equal intervals along the direction of the arched top frame (3).

4. The lightweight forklift frame structure according to claim 1, characterized in that: The lifting mechanism (7) includes a fixed cylinder (9), and a movable rod (10) is slidably connected inside the fixed cylinder (9).

5. A lightweight forklift frame structure according to claim 4, characterized in that: A fixing head (11) is fixedly connected to the upper outer side of the movable rod (10), and a connecting ring (12) is fixedly connected to the fixing head (11). The connecting ring (12) is connected to the protective net (8).

6. A lightweight forklift frame structure according to claim 4, characterized in that: The movable rod (10) has multiple sets of equally spaced threaded holes (13) vertically arranged on its outer side. The fixed cylinder (9) has a threaded through hole on its upper outer side near the threaded holes (13) for connection with a bolt (14). One end of the bolt (14) passes through the threaded through hole and is threadedly connected to the threaded hole (13).

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