A center axle vehicle transport trailer having a widened two-tier loading platform

Abstract

This utility model relates to the field of transport trailer technology and discloses a center-axle vehicle transport trailer with a widened double-layer loading platform. It includes a lower platform for the transport trailer, with hydraulic columns symmetrically installed at one end of the lower platform. A second-layer platform is mounted on the hydraulic columns, with telescopic plates fixed to the side walls of the second-layer platform. A guardrail is fixed to the top surface of the telescopic plates, and a widening component is provided on the bottom surface of the second-layer platform. A fixing plate is fixed to the end side of the lower platform, with a second hydraulic column slidably connected to the fixing plate. A moving component is provided on the end side of the lower platform, with a cable reel mounted on the hydraulic columns. A telescopic rod is fixed to the side wall of the second-layer platform, and a steel cable is wound on the cable reel. This utility model can flexibly adjust the width for different sizes and types of vehicles, meeting the loading and support needs of various models from small cars to wide-body SUVs and low-chassis sports cars.

Description

Technical Field

[0001] This utility model relates to the field of transport trailer technology, specifically a center-axle vehicle transport trailer with an extended two-layer loading platform. Background Technology

[0002] In the field of commercial vehicle logistics and transportation, center-axle vehicle transport trailers have become the core transportation equipment connecting automobile manufacturers, dealers and end customers due to their flexible steering performance, high transportation stability and strong road adaptability. They are widely used in medium- and long-distance bulk transportation scenarios of various commercial vehicles such as sedans, SUVs and new energy vehicles.

[0003] A trailer typically consists of a lower platform for transporting the trailer, a secondary platform for increasing the load capacity, a column structure supporting the secondary platform, and loading and unloading devices to assist in loading and unloading vehicles onto and off the trailer. Its core function is to achieve safe, efficient, and bulk transfer of vehicles, directly affecting the transportation efficiency and cost control of the automotive logistics industry.

[0004] Traditional center-axle vehicle transport trailers typically have fixed designs for the width of the second-level platform, the size of the loading and unloading devices, and the position of the upright supports. This makes it impossible to flexibly adjust the size of the vehicles to be transported. As a result, transport companies need to purchase dedicated trailers for different vehicle models, increasing equipment procurement costs. They also need to invest additional space to store multiple dedicated trailers, which reduces the coverage of a single trailer in various transport scenarios. In mixed-vehicle transport scenarios, multiple trailers need to be dispatched to work together, which restricts the flexibility of transport scheduling and further increases logistics costs.

[0005] Therefore, we propose a center-axle vehicle transport trailer with an extended two-level loading platform to solve the problems mentioned above. Utility Model Content

[0006] The purpose of this utility model is to provide a center-axle vehicle transport trailer with an expanded double-layer loading platform, in order to solve the problem mentioned in the background art that existing trailers cannot be flexibly adjusted according to the size of the goods to be transported, which leads to transportation companies having to purchase special trailers for different vehicle models, increasing equipment procurement costs.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a center-axle vehicle transport trailer with a widened double-layer loading platform, comprising a lower platform of the transport trailer, a hydraulic column 1 symmetrically installed at one end of the lower platform, a double-layer platform installed on the hydraulic column 1, a telescopic plate fixed to the side wall of the double-layer platform, a guardrail fixed to the top surface of the telescopic plate, a widening component provided on the bottom surface of the double-layer platform, a fixing plate fixed to the end side of the lower platform of the transport trailer, a hydraulic column 2 slidably connected to the fixing plate, a moving component provided to the end side of the lower platform of the transport trailer, a cable reel installed on the hydraulic column, a telescopic rod fixed to the side wall of the double-layer platform, a steel cable wound on the cable reel, and the steel cable fixedly connected to the telescopic rod;

[0008] The widening component includes a crossbeam fixedly connected to the bottom surface of the second-floor platform, an extension beam slidably connected inside the crossbeam, a fixing rod fixed on the extension beam, and the fixing rod fixedly connected to the telescopic plate.

[0009] Preferably, the crossbeam has a notch, and there are multiple extension beams, which are slidably connected to the notch. Multiple bolts are threaded onto the crossbeam.

[0010] Preferably, the extension beam has multiple screw holes, and the multiple bolts are threaded into the multiple screw holes.

[0011] Preferably, the moving component includes a hydraulic cylinder fixedly connected to the end of the lower platform of the transport trailer, a piston rod fixedly connected to the output end of the hydraulic cylinder, and a connecting plate fixed to the end of the piston rod.

[0012] Preferably, the fixing plate has a sliding groove, and the bottom surface of the hydraulic column is fixed with an embedded block, which is slidably connected to the sliding groove.

[0013] Preferably, the other end of the steel cable is fixed with a connecting seat, the end of the connecting seat is hinged with a hinge rod, the other end of the hinge rod is hinged with a hinge block, and the hinge block is fixedly connected to the hydraulic column two.

[0014] Preferably, a mounting base is fixed to the lower platform end of the transport trailer, a rotating shaft is fixed inside the mounting base, a hydraulic tail plate is rotatably connected to the outer ring of the rotating shaft, and an adjusting component is installed on the hydraulic tail plate.

[0015] Preferably, the adjusting component includes a fixed beam fixed to the hydraulic tail plate, the fixed beam having a second screw hole, an expanding beam slidably connected to the fixed beam, the expanding beam being fixedly connected to the connecting seat, and a second bolt threaded onto the expanding beam, the second bolt being threaded into the second screw hole.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This transport trailer can be flexibly widened and adjusted to accommodate different sizes and types of vehicles. Through the adjustment of the width of the two-level platform, the adaptation of the hydraulic tailgate length, and the precise positioning of the hydraulic column double support, it can meet the loading and support needs of different models, from small cars to wide-body SUVs and low-chassis sports cars, solving the adaptation problem of traditional trailers that are used for one type of vehicle. There is no need to purchase special trailers for specific models, which greatly reduces the equipment procurement and maintenance costs of transportation companies. At the same time, it improves the coverage of transportation scenarios for a single trailer, especially suitable for logistics transportation scenarios with mixed multi-model loading, enhancing the flexibility of transportation scheduling.

[0018] 2. During the widening and adjustment process, the trailer relies on hydraulic drive and a standardized mechanical structure, eliminating the need for manual pushing, lifting, or pulling of components. It also eliminates the high-intensity physical labor required for traditional ladder-climbing operations, significantly reducing the workload of drivers and operators. The entire adjustment process is simplified and easy to understand, shortening pre-transportation preparation time and loading operation time. In multi-batch transportation scenarios, it can effectively reduce transportation intervals, improve overall logistics turnover efficiency, and help transportation companies reduce costs and increase efficiency.

[0019] 3. The hydraulic tailgate in this transport trailer, after adjustment, allows for a loading angle significantly smaller than that of traditional ladders. Combined with the extended tailgate length from the widened beam, it prevents scraping between the chassis and tailgate edges during loading and unloading of low-chassis vehicles, protecting the vehicle's appearance and chassis components. The second-level platform can be finely adjusted to a suitable climbing angle, ensuring a smooth, bump-free, and unimpeded ride for the vehicle, preventing loss of control and collisions due to improper operation. After loading, the hydraulic tailgate locks vertically, serving as a rear door to prevent dust and debris from entering the trailer, and also cushioning the impact in rear-end collisions, reducing deformation, scratches, and other damage to the vehicle. This lowers vehicle damage claims costs for transport companies and enhances customer satisfaction with transport services.

[0020] 4. The hydraulic support column of this transport trailer does not occupy the space of the second-level platform during adjustment and support. Combined with the widened design of the second-level platform, it can significantly increase the actual working area and loading area of ​​the second-level platform. Compared with traditional trailers, it can carry more vehicles of different widths at the same time, effectively solving the problem of limited loading capacity caused by the space occupied by traditional columns, further improving the single transport capacity of the trailer, and helping transport companies create higher efficiency in a single transport task. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the overall three-dimensional structure of the present invention. Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the overall three-dimensional structure of the present invention. Figure 3 ;

[0024] Figure 4 This is a three-dimensional structural diagram of the widening component of this utility model.

[0025] In the diagram: 1. Under-platform of the transport trailer; 2. Hydraulic column one; 3. Second-level platform; 4. Telescopic plate; 5. Guardrail; 6. Widening component; 61. Crossbeam; 62. Notch; 63. Extension beam; 64. Screw hole one; 65. Bolt one; 66. Fixing rod; 7. Fixing plate; 71. Slide groove; 8. Hydraulic column two; 9. Moving component; 91. Hydraulic cylinder; 92. Piston rod; 93. Connecting plate; 94. Embedded block; 10. Telescopic rod; 11. Cable reel; 12. Steel cable; 13. Connecting seat; 14. Hinge rod; 15. Hinge block; 16. Adjusting component; 161. Widening beam; 162. Bolt two; 163. Fixing beam; 164. Screw hole two; 17. Mounting seat; 18. Rotating shaft; 19. Hydraulic tailgate. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1: Please refer to Figure 1 - Figure 4 A center-axle vehicle transport trailer with an extended double-level loading platform includes a lower platform 1. Hydraulic columns 2 are symmetrically installed at one end of the lower platform 1. This design achieves the extension and retraction of the columns through hydraulic drive, significantly improving the adjustment precision compared to traditional columns. The column height can be precisely adjusted according to the support requirements of vehicles of different heights, ensuring stable support for the vehicles. Simultaneously, the internal hydraulic lifting and telescopic structure greatly enhances the load-bearing capacity and strength of the columns, effectively supporting heavier vehicles and preventing column deformation or damage during transportation. Furthermore, this structural design ensures that the columns do not occupy space on the double-level platform 3 during extension and retraction, thus providing a larger working area for the double-level platform 3 and improving the loading efficiency and quantity of vehicles.

[0028] A second-level platform 3 is installed on the hydraulic column 2. Telescopic plates 4 are fixed to the side walls of the second-level platform 3, and guardrails 5 are fixed to the top surface of the telescopic plates 4. A widening component 6 is provided on the bottom surface of the second-level platform 3. The specific widening dimensions can be designed according to actual transportation needs and the overall structure of the trailer. The widened second-level platform 3 has a significantly increased area, providing operators with more space to move around when securing and inspecting vehicles on the platform, effectively reducing safety risks. At the same time, the wider platform can easily accommodate wide-sized vehicles without requiring special adjustments or disassembly, improving loading convenience.

[0029] The widening component 6 includes a crossbeam 61 fixedly connected to the bottom surface of the second-level platform 3. An extension beam 63 is slidably connected inside the crossbeam 61. A fixing rod 66 is fixed on the extension beam 63. The fixing rod 66 is fixedly connected to the telescopic plate 4. A notch 62 is opened inside the crossbeam 61. Multiple extension beams 63 are provided. Multiple extension beams 63 are slidably connected to the notch 62. Multiple bolts 65 are threadedly installed on the crossbeam 61. Multiple screw holes 64 are opened on the extension beams 63. Multiple bolts 65 are threadedly installed into the multiple screw holes 64.

[0030] In this embodiment: When using the trailer to transport vehicles, the area of ​​the second-level platform 3, the state of the hydraulic tailgate 19, and the position of the hydraulic column 2 8 can be adjusted synchronously according to the size of the vehicle to be transported, so as to adapt to vehicles of different sizes.

[0031] First, the operator loosens bolt 65 on the crossbeam 61, causing bolt 65 to gradually exit the screw hole 64. Then, the operator pushes the extension beam 63 to slide along the recess 62 of the crossbeam 61. The extension beam 63 drives the telescopic plate 4 to extend or retract synchronously through the fixing rod 66. When the extension beam 63 extends or retracts, the telescopic plate 4 retracts synchronously. After adjusting to the appropriate position, bolt 65 is screwed into the corresponding screw hole 64 to complete the fixation, thus flexibly changing the width of the second-floor platform 3.

[0032] Simultaneously, by adjusting the adjusting component 16 on the hydraulic tailplate 19, loosening the bolt 162 to slide the widening beam 161, and adjusting the length of the hydraulic tailplate 19 before re-fixing it, it can adapt to vehicles with different chassis heights and lengths. Activating the hydraulic cylinder 91 of the moving component 9 causes the piston rod 92 to drive the hydraulic column 8 to slide along the groove 71 of the fixed plate 7. The position of the hydraulic column 8 can be adjusted according to the vehicle's support requirements. With all three components adjusted to the appropriate position, the trailer can be adapted to different sizes and types of commercial vehicles, from small cars to wide-body SUVs and low-chassis sports cars. This breaks the traditional limitation of one trailer per vehicle, eliminating the need to equip different vehicles with dedicated trailers, significantly improving the trailer's transport adaptability, and reducing the equipment investment costs for transportation companies.

[0033] Furthermore, the entire adjustment process requires no complex tools or strenuous physical labor. The widening component 6 is quickly fixed through the cooperation of bolts and screw holes. The operating logic of the hydraulic tailplate 19 and the adjusting component 16 is consistent with that of the widening component 6, making it simple and easy to understand. The movement of the hydraulic column 2 8 is automatically driven by the hydraulic cylinder 91, eliminating the need for manual pushing and adjustment. Compared to traditional trailer adjustments that require multiple people and take more than half an hour, this trailer allows a single person to complete all adjustment operations. This not only reduces the labor intensity of operators but also significantly shortens the adjustment time, improving pre-transportation preparation efficiency. Especially in multi-batch, multi-vehicle transportation scenarios, it can reduce transportation intervals and improve overall transportation efficiency.

[0034] Example 2: This example is an improvement upon Example 1. For details, please refer to [link / reference]. Figure 1 - Figure 3 A fixing plate 7 is fixed to the side of the lower platform 1 of the transport trailer. A hydraulic column 2 8 is slidably connected to the fixing plate 7. The hydraulic column 2 8 can stably bear the weight of the commercial vehicle, and due to its structural design, it will not occupy the space of the second-level platform 3, ensuring that the second-level platform 3 has sufficient operating and loading space.

[0035] A movable component 9 is provided on the side of the lower platform 1 of the transport trailer. A cable reel 11 is installed on the hydraulic column. A telescopic rod 10 is fixed on the side wall of the second-level platform 3. A steel cable 12 is wound on the cable reel 11. The steel cable 12 is fixedly connected to the telescopic rod 10. A connecting seat 13 is fixed to the other end of the steel cable 12. A hinge rod 14 is hinged to the end of the connecting seat 13. A hinge block 15 is hinged to the other end of the hinge rod 14. The hinge block 15 is fixedly connected to the hydraulic column 8.

[0036] The mobile component 9 includes a hydraulic cylinder 91 fixedly connected to the end of the lower platform 1 of the transport trailer. A piston rod 92 is fixedly connected to the output end of the hydraulic cylinder 91. A connecting plate 93 is fixed to the end of the piston rod 92. A sliding groove 71 is provided on the fixed plate 7. An embedded block 94 is fixed to the bottom surface of the hydraulic column 8. The embedded block 94 is slidably connected to the sliding groove 71.

[0037] A mounting base 17 is fixed to one end of the lower platform 1 of the transport trailer. A rotating shaft 18 is fixed inside the mounting base 17. A hydraulic tail plate 19 is rotatably connected to the outer ring of the rotating shaft 18. An adjusting component 16 is installed on the hydraulic tail plate 19. The adjusting component 16 includes a fixed beam 163 fixed on the hydraulic tail plate 19. A screw hole 164 is opened on the fixed beam 163. An expansion beam 161 is slidably connected to the fixed beam 163. The expansion beam 161 is fixedly connected to the connecting seat 13. A bolt 162 is threaded on the expansion beam 161. The bolt 162 is threaded into the screw hole 164.

[0038] In this embodiment: Before starting the vehicle loading operation, it is necessary to complete the coordinated adjustment of the hydraulic column 28, the take-up reel 11, the telescopic rod 10, the hydraulic tail plate 19 and the adjusting component 16 according to the size and loading position of the vehicle to be loaded. During the adjustment, the hydraulic cylinder 91 in the end side moving component 9 of the lower platform 1 of the transport trailer is activated. The output end of the hydraulic cylinder 91 drives the piston rod 92 to extend and retract in the horizontal direction. The piston rod 92 drives the hydraulic column 28 to move synchronously through the connecting plate 93 fixed at the end side. At this time, the embedded block 94 on the bottom surface of the hydraulic column 28 slides stably along the sliding groove 71 on the fixed plate 7 to avoid displacement. According to the preset support position of the vehicle to be loaded on the second-level platform 3, the hydraulic column 28 is moved to the corresponding area and then the hydraulic cylinder 91 is closed to complete the positioning of the hydraulic column 28. The adjustment process requires no manual intervention and is automated through hydraulic drive. This not only reduces the driver's workload but also allows for precise control of the parking position of the hydraulic column 28, ensuring the stability of subsequent support for the vehicle. At the same time, the internal hydraulic structure design of the hydraulic column 28 does not occupy the space of the second-level platform 3, ensuring sufficient space for operation and loading on the second-level platform 3.

[0039] Start the take-up reel 11 on the hydraulic column 28. If it is necessary to adjust the second-level platform 3 to an inclined state to adapt to the vehicle's climbing requirements, control the take-up reel 11 to release the steel cable 12. The steel cable 12 is slowly released along the outer ring of the take-up reel 11. Since one end of the steel cable 12 is fixedly connected to the telescopic rod 10 on the side wall of the second-level platform 3, after the steel cable 12 is relaxed, the telescopic rod 10 gradually extends under its own telescopic characteristics and the gravity of the second-level platform 3, causing one side of the second-level platform 3 to slowly descend. If it is necessary to raise one side of the second-level platform 3, control the take-up reel 11 to take in the cable. After the steel cable 12 is tightened, it pulls the telescopic rod 10 to retract, thereby causing one side of the second-level platform 3 to rise.

[0040] Meanwhile, the other end of the steel cable 12 is connected to the hinge rod 14 and the hinge block 15 via the connecting seat 13. The hinge block 15 is fixed on the hydraulic column 8. During the winding and unwinding of the steel cable 12, the hinge rod 14 can rotate flexibly around the hinge point of the connecting seat 13 and the hinge block 15, preventing the steel cable 12 from breaking due to tension and ensuring the safety of the adjustment process. By precisely winding and unwinding the steel cable 12 through the take-up reel 11, the second-level platform 3 can be finely adjusted to an angle that matches the vehicle's driving path, solving the problem of difficulty in vehicle ascent and descent caused by the fixed angle of traditional platforms.

[0041] Next, adjust the adjusting component 16 on the hydraulic tailgate 19 according to the chassis height of the vehicle to be loaded. First, loosen the bolt 162 on the widening beam 161 so that the bolt 162 is disengaged from the screw hole 164 on the fixed beam 163, thereby releasing the fixed constraint between the widening beam 161 and the fixed beam 163. Then, slide the widening beam 161 along the length of the fixed beam 163. The widening beam 161 is fixedly connected to the connecting seat 13, and the overall length of the hydraulic tailgate 19 is adjusted synchronously. When the length of the hydraulic tailgate 19 is adjusted to a state where the loading angle is smaller when it is completely placed on the ground, stop sliding the widening beam 161 and screw the bolt 162 back into the screw hole 164 at the corresponding position on the fixed beam 163 to complete the length fixation of the hydraulic tailgate 19.

[0042] After adjustment, the rotating shaft 18 inside the control mounting base 17 is rotated, causing the hydraulic tail plate 19 to slowly flip around the mounting base 17 until it is completely in contact with the ground. At this time, the tilt angle of the hydraulic tail plate 19 is much smaller than that of a traditional ladder, avoiding the risk of chassis scraping during loading and unloading of low-chassis vehicles. At the same time, the flipping of the hydraulic tail plate 19 is achieved by rotating smoothly with the rotating shaft 18, without the need for manual lifting or disassembly, further reducing the driver's operating intensity.

[0043] After the above adjustment steps are completed, the driver slowly drives the vehicle to be loaded to the rear of the transport trailer. The vehicle travels along the hydraulic tailgate 19, which is completely in contact with the ground. Because the loading angle of the hydraulic tailgate 19 is small after being adapted by the adjusting component 16, and the widening beam 161 extends the length of the tailgate, the chassis of the low chassis vehicle will not scrape against the edge of the tailgate. The vehicle can smoothly drive onto the hydraulic tailgate 19 and enter the area of ​​the lower platform 1 of the transport trailer. If it is necessary to load the vehicle onto the second-level platform 3, the driver continues to drive the vehicle along the lower platform to the bottom of the second-level platform 3. At this time, the second-level platform 3 has been slightly adjusted to the appropriate angle by the cable reel 11 and the telescopic rod 10. The vehicle can slowly drive onto the second-level platform 3 along the inclined path of the second-level platform 3 until the front wheels of the vehicle reach the preset parking position and then stop.

[0044] After the vehicle comes to a complete stop, the hydraulic lifting and telescopic system inside the pipe of the hydraulic column 28 is activated. The hydraulic column 28 extends upward to the top and contacts the vehicle chassis to provide stable support. At the same time, the cable reel 11 can be activated again to fine-tune the tension of the steel cable 12, so that the second-level platform 3 is restored to a horizontal state, ensuring that the vehicle will not slide on the second-level platform 3 due to tilting. Finally, the vehicle is fixed to the second-level platform 3 by the fixing device, and the loading of the second-level platform 3 is completed.

[0045] After loading is completed, the hydraulic system is activated to control the hydraulic tailgate 19 to rotate upward around the pivot 18 until the tailgate stands vertically and fits against the rear of the trailer. The hydraulic tailgate 19 is then fixed by the locking mechanism at the rear of the trailer. At this time, the hydraulic tailgate 19 not only serves as an independent loading platform to transport additional vehicles, but also functions as a trailer rear door, protecting the vehicles loaded on the lower platform and the second-level platform 3. This prevents external dust and debris from entering the trailer during transportation. In the event of a rear-end collision, the hydraulic tailgate 19 can buffer the impact force of the collision, reducing the risk of damage to the vehicles.

[0046] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0047] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A center-axle vehicle transport trailer with an extended two-level loading platform, comprising a lower platform (1) of the transport trailer, characterized in that: Hydraulic columns (2) are symmetrically installed at one end of the transport trailer lower platform (1). A second-level platform (3) is installed on the hydraulic columns (2). A telescopic plate (4) is fixed on the side wall of the second-level platform (3). A guardrail (5) is fixed on the top surface of the telescopic plate (4). A widening component (6) is provided on the bottom surface of the second-level platform (3). A fixing plate (7) is fixed on the end side of the transport trailer lower platform (1). A hydraulic column (8) is slidably connected on the fixing plate (7). A moving component (9) is provided on the end side of the transport trailer lower platform (1). A take-up reel (11) is installed on the hydraulic columns. A telescopic rod (10) is fixed on the side wall of the second-level platform (3). A steel cable (12) is wound on the take-up reel (11). The steel cable (12) is fixedly connected to the telescopic rod (10). The widening component (6) includes a crossbeam (61) fixedly connected to the bottom surface of the second-level platform (3), an extension beam (63) slidably connected inside the crossbeam (61), a fixing rod (66) fixed on the extension beam (63), and the fixing rod (66) fixedly connected to the telescopic plate (4).

2. A center-axle vehicle transport trailer with an extended two-level loading platform according to claim 1, characterized in that: The crossbeam (61) has a notch (62) inside, and there are multiple extension beams (63). The multiple extension beams (63) are slidably connected to the notch (62), and multiple bolts (65) are threaded on the crossbeam (61).

3. A center-axle vehicle transport trailer with an extended two-level loading platform according to claim 2, characterized in that: The extension beam (63) has multiple screw holes (64), and multiple bolts (65) are threaded into the multiple screw holes (64).

4. A center-axle vehicle transport trailer with an extended two-level loading platform according to claim 1, characterized in that: The moving component (9) includes a hydraulic cylinder (91) fixedly connected to the end side of the lower platform (1) of the transport trailer. A piston rod (92) is fixedly connected to the output end of the hydraulic cylinder (91), and a connecting plate (93) is fixed to the end side of the piston rod (92).

5. A center-axle vehicle transport trailer with an extended two-level loading platform according to claim 4, characterized in that: The fixed plate (7) has a sliding groove (71), and the bottom surface of the hydraulic column (8) is fixed with an embedded block (94), which is slidably connected to the sliding groove (71).

6. A center-axle vehicle transport trailer with an extended two-level loading platform according to claim 1, characterized in that: The other end of the steel cable (12) is fixed with a connecting seat (13), and a hinge rod (14) is hinged to one end of the connecting seat (13). A hinge block (15) is hinged to the other end of the hinge rod (14), and the hinge block (15) is fixedly connected to the hydraulic column (8).

7. A center-axle vehicle transport trailer with an extended double-layer loading platform according to claim 6, characterized in that: The lower platform (1) of the transport trailer is fixed with a mounting base (17) at one end. A rotating shaft (18) is fixed inside the mounting base (17). A hydraulic tail plate (19) is rotatably connected to the outer ring of the rotating shaft (18). An adjusting component (16) is installed on the hydraulic tail plate (19).

8. A center-axle vehicle transport trailer with an extended two-level loading platform according to claim 7, characterized in that: The adjusting component (16) includes a fixed beam (163) fixed on the hydraulic tail plate (19), a screw hole (164) is provided on the fixed beam (163), an expansion beam (161) is slidably connected to the fixed beam (163), the expansion beam (161) is fixedly connected to the connecting seat (13), and a bolt (162) is threaded on the expansion beam (161), the bolt (162) is threaded into the screw hole (164).

Images