Freight trolley fixing structure and using method thereof

Abstract

The fixing structure of the freight trolley comprises the bearing unit arranged on the longitudinal beam of the freight frame, the trolley is placed on the bearing unit, and therefore the trolley is fixed to the longitudinal beam of the freight frame, the problem that the storage space is occupied due to the fact that the trolley is placed in a cargo compartment is solved, the problem that the storage space of the cargo compartment is not enough is solved, and the safety of the cargo compartment is improved. The invention further provides a using method of the freight trolley fixing structure, the freight trolley fixing structure is convenient to store or take out, and the loading and transporting efficiency in the freight process can be improved.

Description

Technical Field

[0001] This invention belongs to the field of freight vehicle loading. Specifically, this invention relates to a freight trolley fixing structure and its usage method. Background Technology

[0002] In the current booming freight industry, maximizing cargo capacity while meeting loading quality requirements is receiving increasing attention from customers. According to data from the China Federation of Logistics and Purchasing in 2025, the number of small trucks in my country has exceeded 8 million, with 75% used for urban distribution, such as supermarket delivery and building material transportation. Profit per trip is closely related to the loading volume. However, current small truck freight space is insufficient, with the disorderly storage of cargo carts being a key constraint. Analysis of typical user scenarios shows that to meet last-mile delivery efficiency, 92% of small truck users carry 1 to 2 folding cargo carts, primarily with dimensions of 900mm × 600mm.

[0003] However, the lack of a dedicated trolley securing device results in trolleys being freely stacked inside the cargo compartment, occupying an average of 12%-15% of the effective cargo space, equivalent to a direct loss of 8%-10% of the revenue per transport trip. During vehicle operation, especially when starting and braking, the trolleys shift and damage the goods. At the same time, staff need to spend an additional 2 to 3 minutes on average to place and secure the trolleys, affecting loading and transport efficiency.

[0004] Therefore, in order to improve or solve at least one of the above problems, a freight trolley fixing structure and its usage method are provided, which can solve the problem of trolleys occupying storage space in the cargo compartment, help avoid the problem of insufficient cargo compartment storage space, facilitate the storage and retrieval of trolleys, and improve loading and transportation efficiency. Summary of the Invention

[0005] This invention addresses the aforementioned problems and aims to provide a cargo trolley fixing structure and its usage method that solves the problem of insufficient cargo space due to trolleys occupying storage space, facilitates the storage and retrieval of trolleys, and improves loading and transportation efficiency. To achieve the above objective, the technical solution adopted by this invention is as follows: The present invention provides a cargo trolley fixing structure, which includes a support unit disposed on the longitudinal beam of the cargo vehicle frame, and the trolley is placed on the support unit.

[0006] The cargo trolley fixing structure provided by the present invention may also have the following features: the supporting unit includes a support plate, a left fixing plate and a right fixing plate, the left fixing plate and the right fixing plate are respectively disposed on both sides of the support plate, the side of the left fixing plate away from the support plate is connected to the longitudinal beam of the cargo frame, and the side of the right fixing plate away from the support plate is connected to the longitudinal beam of the cargo frame.

[0007] The cargo cart fixing structure provided by the present invention may also have the following features: a first mounting bolt hole is provided on the left fixing plate; and a second mounting bolt hole is provided on the right fixing plate.

[0008] The cargo trolley fixing structure provided by the present invention may also have the following feature: the supporting unit further includes a front baffle, which is disposed on the support plate and located on the side of the support plate away from the rear of the vehicle.

[0009] The cargo cart fixing structure provided by the present invention may also have the following feature: the supporting unit further includes a front pressure plate, which is disposed on the front baffle and located above the cart.

[0010] The cargo trolley fixing structure provided by the present invention may also include a locking and limiting component, which includes a rotating shaft, a rotating shaft seat, and a hook rod. The rotating shaft is movably inserted into the rotating shaft seat, the rotating shaft seat is mounted on a support plate, and the hook rod is connected to the rotating shaft.

[0011] The cargo trolley fixing structure provided by the present invention may also have the following feature: the locking limiting component further includes a locking spring, which is sleeved on the rotating shaft, with one end of the locking spring connected to the rotating shaft and the other end of the locking spring connected to the rotating shaft seat.

[0012] The cargo cart fixing structure provided by the present invention may also have the following feature: the support plate is provided with wheel grooves, which correspond to the cart wheels.

[0013] The cargo cart fixing structure provided by the present invention may also have the following feature: the left fixing plate and the right fixing plate are provided with strap holes.

[0014] The present invention also provides a method of using the above-described cargo trolley fixing structure, characterized in that, during the placement of the trolley, the trolley is folded up and placed on a support plate, the trolley is pushed forward along the support plate so that the front end of the trolley abuts against the front baffle, and then the trolley is fixed by a locking and limiting component; during the removal of the trolley, the locking and limiting component is unlocked and the trolley is pulled out along the direction of the support plate. The technical effects of this invention are as follows: The freight trolley fixing structure provided by this invention includes a support unit set on the longitudinal beam of the freight vehicle frame. The trolley is placed on the support unit, thereby fixing the trolley to the longitudinal beam of the freight vehicle frame. This solves the problem of the trolley occupying storage space in the cargo compartment, which helps to avoid the problem of insufficient storage space in the cargo compartment. It also eliminates the problem of damage to goods caused by the starting and stopping of the freight vehicle due to the trolley in the cargo compartment. This invention also provides a method of using the above-mentioned freight trolley fixing structure, which facilitates the storage or retrieval of the trolley and can improve the loading and transportation efficiency during freight transportation. Attached Figure Description

[0015] This manual includes the following figures, which illustrate the following: Figure 1 This is a schematic diagram of the structure of the freight trolley fixing structure in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure in an embodiment of the present invention, showing that the fixed structure of the freight trolley is installed on the longitudinal beam of the freight vehicle frame; Figure 3 This is a schematic diagram of the structure in which the trolley is placed on the fixed structure of the freight trolley in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the trolley and the cargo trolley fixing structure installed on the longitudinal beam of the cargo vehicle frame in an embodiment of the present invention; Figure 5 This is a schematic diagram of the locking and limiting component in an embodiment of the present invention; Figure 6 This is a schematic diagram of the support plate in an embodiment of the present invention.

[0016] The components in the diagram are marked as follows: longitudinal beam of freight vehicle frame -1, trolley -2, support unit -10, support plate -11, left fixing plate -12, first mounting bolt hole -121, right fixing plate -13, second mounting bolt hole -131, front baffle -14, front pressure plate -15, wheel groove -16, strap hole -17, locking limiting assembly -20, pivot -21, pivot seat -22, hook rod -23, locking spring -24. Detailed Implementation

[0017] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0018] Figure 1 This is a schematic diagram of the structure of the freight trolley fixing structure in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure in an embodiment of the present invention, showing that the fixed structure of the freight trolley is installed on the longitudinal beam of the freight vehicle frame; Figure 3 This is a schematic diagram of the structure in which the trolley is placed on the fixed structure of the freight trolley in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the trolley and the freight trolley fixing structure installed on the longitudinal beam of the freight vehicle frame in an embodiment of the present invention.

[0019] like Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, the freight trolley fixing structure provided by the present invention includes a support unit 10 set on the longitudinal beam 1 of the freight vehicle frame. The trolley 2 is placed on the support unit 10, thereby fixing the trolley 2 on the longitudinal beam 1 of the freight vehicle frame. This solves the problem of the trolley 2 occupying storage space in the cargo compartment, which helps to avoid the problem of insufficient storage space in the cargo compartment. It also eliminates the problem of damage to items caused by the trolley 2 in the cargo compartment due to the starting and stopping of the freight vehicle. The trolley 2 can be placed by the support unit 10, which facilitates the storage or retrieval of the trolley 2. This can improve the loading and transportation efficiency during freight transportation and save the time and cost of the staff.

[0020] The support unit 10 includes a support plate 11, a left fixed plate 12, and a right fixed plate 13. The left fixed plate 12 and the right fixed plate 13 are respectively disposed on both sides of the support plate 11 and are parallel to each other. The side of the left fixed plate 12 away from the support plate 11 is connected to the longitudinal beam 1 of the freight vehicle frame, and the side of the right fixed plate 13 away from the support plate 11 is connected to the longitudinal beam 1 of the freight vehicle frame, thereby realizing the connection between the support plate 11 and the vehicle body, improving the stability between the support plate 11, the left fixed plate 12, and the right fixed plate 13, and improving the load-bearing capacity of the support plate 11. The left fixed plate 12 and the right fixed plate 13 can provide lateral restraint, preventing the trolley 2 from tipping over and improving the stability of the trolley 2 during transportation.

[0021] The left fixing plate 12 is provided with a first mounting bolt hole 121. Bolts pass through the first mounting bolt hole 121 and the longitudinal beam 1 of the freight vehicle frame to connect the left fixing plate 12 to the vehicle body, facilitating the installation or removal of the left fixing plate 12. The right fixing plate 13 is provided with a second mounting bolt hole 131. Bolts pass through the second mounting bolt hole 131 and the longitudinal beam 1 of the freight vehicle frame to connect the right fixing plate 13 to the vehicle body, facilitating the installation or removal of the right fixing plate 13. Simultaneously, it can adapt to the longitudinal beams of different truck models, facilitating the modification and upgrading of existing freight vehicles. It is suitable for large-scale upgrades of existing vehicles without destructive modifications to the original vehicle, reducing modification costs. It avoids the weak anti-bumping ability caused by direct welding, prevents weld cracking under long-term stress, effectively avoids the problem of the support unit 10 falling off, and improves the reliability and service life of the structure.

[0022] The support unit 10 also includes a front baffle 14, which is mounted on the support plate 11 and located on the side of the support plate 11 away from the rear of the vehicle. The front baffle 14 can effectively prevent the trolley 2 from moving forward due to sudden braking or bumps of the vehicle, thus preventing the trolley 2 from sliding off the support plate 11 and the support unit 10, eliminating the risk of the trolley 2 falling off, and improving the safety of the transportation process. It also reduces the direct collision between the trolley 2 and the longitudinal beam 1 of the freight vehicle frame, reduces the wear and tear on the trolley 2 and the support unit 10, and extends the service life of the components. At the same time, the front baffle 14 is only mounted at the front end of the support plate 11 and does not affect the loading and unloading operation of the trolley 2 from the rear of the vehicle, thus taking into account both the limiting function and the loading and unloading efficiency.

[0023] The support unit 10 also includes a front pressure plate 15, which is mounted on the front baffle 14 and located above the trolley 2. The front pressure plate 15 presses down on the front end of the trolley 2, effectively limiting the upward bounce of the trolley 2 and preventing the trolley 2 from detaching from the support unit when the vehicle is bumpy, thus completely eliminating the risk of falling. The front pressure plate 15 helps to lower the center of gravity of the trolley 2, enhancing its anti-rollover ability during travel, and is especially suitable for complex working conditions such as sharp turns and bumpy roads. The height of the front pressure plate 15 can be adjusted according to the size of the trolley 2, solving the problem of fixing and adapting trolleys of different specifications, improving versatility, and the front pressure plate 15 does not affect the loading and unloading efficiency when picking up and putting down the trolley 2.

[0024] Figure 5 This is a schematic diagram of the locking and limiting component in an embodiment of the present invention.

[0025] like Figure 5 As shown, the freight trolley fixing structure provided by the present invention also includes a locking and limiting component 20. The locking and limiting component 20 is disposed on the support plate 11, located on the side of the support plate 11 near the rear of the vehicle. The locking and limiting component 20 includes a rotating shaft 21, a rotating shaft seat 22, and a hook rod 23. The rotating shaft 21 is rotatably inserted into the rotating shaft seat 22, which is on the support plate 11. Two rotating shaft seats 22 are on the support plate 11. The hook rod 23 is connected to the rotating shaft 21 and is L-shaped, so that the hook rod 23 can rotate with the rotating shaft 21 within the rotating shaft seat 22. The hook rod 23 is attached to the trolley 2, thereby hooking the side of the trolley 2 away from the front baffle 14, effectively restricting the trolley 2 from moving. Together with the front baffle 14 and the front pressure plate 15, the trolley 2 can be limited in both directions, effectively eliminating the risk of the trolley 2 moving on slopes, bumpy roads, and during start-stop operations, and improving the safety of the transportation process. Meanwhile, the hook rod 23 can rotate with the pivot 21. When taking out the trolley 2, simply pull out and flip the hook rod 23 downward to unlock it. No additional tools are required, simplifying the operation process. This ensures that the locking and limiting component 20 does not interfere with the original support unit 10 structure. It can be assembled simultaneously or added later without affecting the overall structural strength and ease of loading and unloading.

[0026] like Figure 5 As shown, the locking and limiting assembly 20 also includes a locking spring 24, which is sleeved on the rotating shaft 21 and located between two rotating shaft seats 22. One end of the locking spring 24 is connected to the rotating shaft 21, and the other end is connected to the rotating shaft seat 22, providing preload force for the hook rod 23. The locking spring 24 ensures that the hook rod 23 is in close contact with the rear of the trolley 2, improving the reliability of the locking and limiting assembly 20, adapting to vibrations caused by road bumps, and effectively limiting the trolley 2's movement. Spring tension design: According to Hooke's Law (F=kx), the spring stiffness k=12N / mm, and the preload x=15mm, ensuring that the contact pressure between the hook rod 23 and the pressure plate is ≥25N during travel, preventing movement.

[0027] Figure 6 This is a schematic diagram of the support plate in an embodiment of the present invention.

[0028] like Figure 6 As shown, the support plate 11 is provided with wheel grooves 16, which correspond to the wheels of the trolley 2. When the trolley 2 is placed on the support plate 11, the wheel grooves 16 can constrain and position the wheels of the trolley 2. At the same time, the wheel grooves 16 have a guiding function, allowing the trolley 2 to slide quickly into the predetermined position along the wheel grooves 16 when placed, without the need for repeated manual alignment, thus improving loading and unloading efficiency. The groove structure of the wheel grooves 16 can distribute the pressure load of the wheels, reduce the contact area between the wheels and the support plate 11, reduce the transmission efficiency of bumps and vibrations, and play a certain role in buffering and damping.

[0029] The left fixing plate 12 and the right fixing plate 13 are provided with strap holes 17. The strap holes 17 can be used to pass through flexible straps. The flexible straps can be used for secondary reinforcement in extreme working conditions or for non-standard trolleys, achieving a redundant design for fixed reliability. The binding position and tightness can be flexibly adjusted according to the actual size of the trolley 2, breaking through the size limitations of rigid structures and adapting to trolleys of different specifications. When the rigid locking components fail, emergency fixation can be quickly achieved through the straps to prevent the trolley from falling off and improve the safety of the transportation process.

[0030] The present invention also provides a method of using the above-described cargo trolley fixing structure. During the placement of the trolley, the trolley 2 is folded up and pushed along the support plate 11 until the front end of the trolley 2 contacts the front baffle 14 and stops. The height is limited by the front pressure plate 15. The hook rod 23 is pulled, the locking spring 24 is compressed, and the hook rod 23 is rotated to lock into the upper surface of the trolley 2. The locking spring 24 releases its spring tension, ensuring that the locking limiting component 20 is reliably locked.

[0031] During the removal of the trolley, pull the hook rod 23, compress the locking spring 24 again, rotate the hook rod 23 so that the hook rod 23 is disengaged from the upper surface of the trolley 2, hold the handle of the trolley 2 with both hands, and pull out the trolley 2.

[0032] Specifically, the left fixing plate 12 is connected to the left-side longitudinal beam 1 of the freight vehicle frame via three sets of M8×20 bolts (Q1840820). The bolts are tightened diagonally with a torque of 30 N·m ± 2 N·m. The right fixing plate 13 is installed in the same way, ensuring that the symmetry between the left and right fixing plates 12 and 13 is ≤0.5 mm. The front baffle 14 and front pressure plate 15 are fixed to the frame crossbeam using a three-point fixing method, using M8×25 bolts (Q1840825) with spring washers. The locking spring 24 is made of 60Si2MnA material with a diameter of φ11 mm. After pre-compression, it is inserted into the rotating shaft 21 with a pre-compression of 20%. The rotating shaft 21 is connected to the hook rod 23 by CO2 gas shielded welding, and VT visual inspection is performed after welding. The rotating shaft seat 22 is fixed to the support plate 11 by plug welding, with a weld diameter of 3 mm and a spacing of 5 mm. To ensure consistency in accuracy, function, and assembly process after the above standard operating procedures, further optimization is carried out through assembly tolerance control, functional verification testing, and ergonomic optimization. Spatial positioning is achieved using tooling fixtures, with assembly accuracy ≤1mm. Key bolt connections are coated with Koch threadlocker (temperature resistance -55℃~150℃). Static load testing involves applying a 50kg vertical load, with maximum deformation ≤1.2mm. Vibration durability testing is conducted according to GB / T 2423.10-2019 standard, involving 3 hours of frequency sweep vibration (frequency range 5-200Hz, acceleration 3g). Salt spray corrosion testing involves spraying with 5% NaCl solution for 480 hours, with surface rust area ≤5%. The hook operating force is designed to be 18N±3N (compliant with ISO 10063 operating force standard), and the spring preload is controlled with ±5% accuracy using specialized tooling (torque wrench + angle encoder).

[0033] The freight trolley fixing structure provided by the present invention includes a support unit 10 set on the longitudinal beam 1 of the freight vehicle frame. The trolley 2 is placed on the support unit 10, thereby fixing the trolley 2 on the longitudinal beam 1 of the freight vehicle frame. This solves the problem of the trolley 2 occupying storage space in the cargo compartment, which helps to avoid the problem of insufficient storage space in the cargo compartment. It also eliminates the problem of damage to items caused by the trolley 2 in the cargo compartment due to the starting and stopping of the freight vehicle. The trolley 2 can be placed by the support unit 10, which facilitates the storage or retrieval of the trolley 2. This can improve the loading and transportation efficiency during freight transportation and save the time and cost of the staff.

[0034] During the placement of the trolley, fold the trolley 2 and push it along the support plate 11 until the front end of the trolley 2 contacts the front baffle 14 and stops. The height is limited by the front pressure plate 15. Pull the hook rod 23 to compress the locking spring 24. Rotate the hook rod 23 to make it lock into the upper surface of the trolley 2. The locking spring 24 releases its spring tension to ensure that the locking limiting component 20 locks reliably.

[0035] During the removal of the trolley, pull the hook rod 23, compress the locking spring 24 again, rotate the hook rod 23 so that the hook rod 23 is disengaged from the upper surface of the trolley 2, hold the handle of the trolley 2 with both hands, and pull out the trolley 2.

[0036] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A cargo trolley fixing structure, characterized in that, It includes a support unit (10) set on the longitudinal beam (1) of the freight vehicle frame, and a trolley (2) placed on the support unit (10).

2. The freight trolley fixing structure according to claim 1, characterized in that, The supporting unit (10) includes a support plate (11), a left fixing plate (12) and a right fixing plate (13). The left fixing plate (12) and the right fixing plate (13) are respectively disposed on both sides of the support plate (11). The side of the left fixing plate (12) away from the support plate (11) is connected to the longitudinal beam (1) of the freight vehicle frame, and the side of the right fixing plate (13) away from the support plate (11) is connected to the longitudinal beam (1) of the freight vehicle frame.

3. The freight trolley fixing structure according to claim 2, characterized in that, The left fixing plate (12) is provided with a first mounting bolt hole (121); the right fixing plate (13) is provided with a second mounting bolt hole (122).

4. The freight trolley fixing structure according to claim 2, characterized in that, The support unit (10) also includes a front baffle (14), which is disposed on the support plate (11) and located on the side of the support plate (11) away from the rear of the vehicle.

5. The freight trolley fixing structure according to claim 4, characterized in that, The supporting unit (10) also includes a front pressure plate (15), which is disposed on the front baffle (14) and located above the trolley (2).

6. The freight trolley fixing structure according to claim 5, characterized in that, It also includes a locking and limiting component (20), which includes a pivot (21), a pivot seat (22), and a hook rod (23). The pivot (21) is movably inserted into the pivot seat (22), which is located on the support plate (11), and the hook rod (23) is connected to the pivot (21).

7. The freight trolley fixing structure according to claim 6, characterized in that, The locking limiting assembly (20) also includes a locking spring (24), which is sleeved on the rotating shaft (21). One end of the locking spring (24) is connected to the rotating shaft (21), and the other end of the locking spring (24) is connected to the rotating shaft seat (22).

8. The freight trolley fixing structure according to claim 2, characterized in that, The support plate (11) is provided with wheel grooves (16), which correspond to the wheels of the trolley (2).

9. The freight trolley fixing structure according to claim 2, characterized in that, The left fixing plate (12) and the right fixing plate (13) are provided with strap holes (17).

10. A method of using the freight trolley fixing structure according to any one of claims 1 to 9, characterized in that, During the placement of the trolley (2), fold the trolley (2) up and place it on the support plate (11). Push the trolley (2) forward along the support plate (11) so that the front end of the trolley (2) abuts against the front baffle (14). Then fix the trolley (2) by locking the limiting component (20). During the removal of the trolley (2), unlock the locking limiting component (20) and pull the trolley (2) out along the direction of the support plate (11).

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