Hydraulic folding device for a trailer bed

Abstract

The utility model discloses a hydraulic folding device for trailer hopper belongs to trailer accessory technical field, it includes: main frame, auxiliary frame, link plate and extension plate, one end of link plate is hinged with main frame, link plate and main frame are provided with first hydraulic folding mechanism, the other end of link plate is hinged with auxiliary frame, the top of link plate is provided with second hydraulic folding mechanism, extension plate is hinged in the other end of auxiliary frame, the top of auxiliary frame is provided with third hydraulic folding mechanism, the bottom of main frame is provided with controller. The utility model discloses through link plate, auxiliary frame and extension plate's three -segment type hinged design, and cooperate three groups independent hydraulic folding mechanism, can realize the orderly folding of hopper in proper order, under the non -operational state, extension plate, auxiliary frame and link plate can be closely superimposed on main frame, make the longitudinal dimension of whole hopper greatly reduce.

Description

Technical Field

[0001] This utility model relates to the field of trailer accessories technology, and in particular to a hydraulic folding device for trailer beds. Background Technology

[0002] Currently, in the logistics and transportation sector, large trailer beds with expandable functions are increasingly widely used to increase the capacity of a single trip. These beds often employ a segmented structure, connected by hinges to achieve variations in length. Existing technologies offer various methods for expanding and folding the bed. Some simpler solutions rely on purely mechanical structures, such as using manual pins and simple hinges to roughly connect and secure the various sections of the bed. Others may employ more basic hydraulic or pneumatic devices, but these devices are often simply designed and have limited functionality, only capable of swinging or supporting in one direction, lacking coordinated control and optimization of the entire multi-segment folding process.

[0003] However, these existing technical solutions have significant functional and safety drawbacks. While purely mechanical pin and hinge structures are lower in cost, they are extremely cumbersome and laborious in actual operation, requiring operators to spend considerable time and effort manually aligning and locking. This is not only inefficient, but also prone to wear and tear on simple mechanical connection points under bumpy road conditions due to long-term impact, leading to loosening of the truck bed sections, abnormal noises, and even safety hazards during driving. Meanwhile, poorly designed hydraulic extension devices generally lack effective motion constraints and self-stabilizing mechanisms. The hydraulic cylinder mounting points are usually simple single-point hinges, making the extension section prone to swaying under load or during dynamic vehicle movement, resulting in insufficient overall rigidity. Furthermore, multiple extension mechanisms often operate independently, lacking unified control logic, making the folding and unfolding process cumbersome and unable to achieve smooth, orderly automated operation, greatly limiting its practical application and reliability. Therefore, we propose a hydraulic folding device for trailer truck beds to solve this problem. Utility Model Content

[0004] The purpose of this invention is to provide a hydraulic folding device for trailer beds to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A hydraulic folding device for a trailer bed includes: a main frame, a sub-frame, a connecting plate, and an extension plate. One end of the connecting plate is hinged to the main frame. The connecting plate and the main frame are provided with a first hydraulic folding mechanism. The other end of the connecting plate is hinged to the sub-frame. A second hydraulic folding mechanism is provided at the top of the connecting plate. The extension plate is hinged to the other end of the sub-frame. A third hydraulic folding mechanism is provided at the top of the sub-frame. A controller is provided at the bottom of the main frame.

[0006] Preferably, the first hydraulic folding mechanism includes: a first fixed frame, a first connecting frame, and a first hydraulic cylinder, wherein the first fixed frame is fixedly installed at the bottom of the main frame, and the first connecting frame is fixedly installed on one side of the connecting plate; A first rotating seat is rotatably mounted inside the first fixed frame. The first hydraulic cylinder is fixedly mounted on one side of the first rotating seat. A first connecting plate is fixedly mounted on the output end of the first hydraulic cylinder. The first connecting plate is rotatably mounted inside the first connecting frame.

[0007] Preferably, the third hydraulic folding mechanism includes: a third fixed frame, a cross plate, and a third hydraulic cylinder, wherein the third fixed frame is fixedly installed on the top of the subframe, and the cross plate is fixedly installed on one side of the extension plate; A third rotating seat is rotatably installed inside the third fixed frame. The third hydraulic cylinder is fixedly installed on one side of the third rotating seat. A third connecting plate is fixedly installed on the output end of the third hydraulic cylinder. The third connecting plate is hinged to the top of the horizontal plate.

[0008] Preferably, the second hydraulic folding mechanism includes: a second fixed frame, a second connecting frame, and a second hydraulic cylinder, wherein the second fixed frame is fixedly installed on one side of the connecting plate, and the second connecting frame is fixedly installed on the top of the subframe; A second rotating seat is rotatably installed inside the second fixed frame. The second hydraulic cylinder is fixedly installed on one side of the second rotating seat. A second connecting plate is fixedly installed on the output end of the second hydraulic cylinder. The second connecting plate is rotatably installed inside the second connecting frame.

[0009] Preferably, a lower ear plate is fixedly installed at the bottom of the connecting plate and is rotatably installed in the main frame, and an upper ear plate is fixedly installed at the top of the connecting plate and is rotatably installed in the subframe.

[0010] Preferably, a hinge plate is fixedly installed on the top of the extension plate, the hinge plate is rotatably installed in the subframe, and a handle is connected to the front side of the controller.

[0011] The beneficial effects of this utility model are as follows: 1. The hydraulic folding device for trailer beds described in this utility model, through a three-section hinged design of connecting plate, subframe and extension plate, and in conjunction with three sets of independent hydraulic folding mechanisms, can realize the sequential and orderly folding of the trailer bed; in the non-operating state, the extension plate, subframe and connecting plate can be tightly stacked on the main frame, so that the longitudinal dimension of the entire trailer bed is greatly reduced; this compact folding form significantly reduces the parking area of ​​the vehicle, and is very suitable for parking lots, repair shops or road transport scenarios with limited space, effectively solving the common industry problem of inconvenient transfer and storage of long trailers, and improving the flexibility and economy of vehicle use; 2. In this utility model, the hydraulic folding device for a trailer bed achieves mechanical self-locking and operational stability during the folding process through a multi-hinge point layout and a hydraulic cylinder drive method. Each hydraulic folding mechanism adopts a basic structure with a fixed frame accommodating a rotating seat. One end of the hydraulic cylinder is hinged to the rotating seat, and the other end is hinged to the adjacent component through a connecting plate. This design not only provides a stable support foundation for the hydraulic cylinder, but more importantly, the layout of its hinge points naturally forms a stable lever arm system. When the hydraulic cylinder is fully extended to flatten the trailer bed or fully retracted to fold the components into place, each hinge point and the axis of the hydraulic cylinder will enter a stable position close to the dead point. At this time, the internal force of the structure is mainly transmitted along the axial direction of the component, forming a reliable mechanical self-locking effect. This effectively resists the accidental loosening or shaking of components that may be caused by bumps and vibrations during vehicle operation, fully ensuring the structural rigidity and safety during operation. 3. The hydraulic folding device for trailer beds described in this utility model achieves centralized hydraulic control and one-button operation throughout the entire process, significantly reducing the labor intensity of operators and improving operational safety. The entire folding and unfolding action is uniformly commanded by a controller installed at the bottom of the main frame, and instructions can be issued to the three hydraulic cylinders simultaneously or sequentially via a handle. Unlike traditional mechanical locking mechanisms, operators do not need to physically go to different positions in the trailer bed for arduous manual operations or use tools, avoiding the safety risks associated with working in confined spaces or at heights. The hydraulic drive method is powerful and controllable, capable of smoothly and accurately driving heavy trailer bed components to a predetermined angle. The entire process is efficient, labor-saving, and highly repeatable. This highly integrated and automated control method reduces the skill and experience requirements for operators, making complex trailer bed deformation operations simple and easy, effectively improving the overall efficiency and safety level of loading and unloading operations. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of a hydraulic folding device for a trailer bed proposed in this utility model; Figure 2 This is a cross-sectional structural schematic diagram of a hydraulic folding device for a trailer bed proposed in this utility model; Figure 3 for Figure 2 A magnified view of part A in the middle; Figure 4 for Figure 2 A magnified view of part B in the middle section; Figure 5 for Figure 2 Enlarged view of part C Figure 6 This is another cross-sectional view of the hydraulic folding device for a trailer bed proposed in this utility model.

[0013] In the diagram: 1. Main frame; 2. First hydraulic folding mechanism; 201. First fixed frame; 202. First rotating seat; 203. First hydraulic cylinder; 204. First connecting plate; 205. First connecting frame; 3. Connecting plate; 301. Lower ear plate; 302. Upper ear plate; 4. Second hydraulic folding mechanism; 401. Second fixed frame; 402. Second rotating seat; 403. Second hydraulic cylinder; 404. Second connecting plate; 405. Second connecting frame; 5. Subframe; 6. Third hydraulic folding mechanism; 601. Third fixed frame; 602. Third rotating seat; 603. Third hydraulic cylinder; 604. Third connecting plate; 605. Horizontal plate; 7. Extension plate; 701. Hinge plate; 8. Controller; 801. Handle. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0015] Reference Figure 1-6 A hydraulic folding device for a trailer bed includes: a main frame 1, a sub-frame 5, a connecting plate 3, and an extension plate 7. One end of the connecting plate 3 is hinged to the main frame 1. The connecting plate 3 and the main frame 1 are provided with a first hydraulic folding mechanism 2. The other end of the connecting plate 3 is hinged to the sub-frame 5. A second hydraulic folding mechanism 4 is provided at the top of the connecting plate 3. The extension plate 7 is hinged to the other end of the sub-frame 5. A third hydraulic folding mechanism 6 is provided at the top of the sub-frame 5. A controller 8 is provided at the bottom of the main frame 1.

[0016] In this embodiment, the first hydraulic folding mechanism 2 includes: a first fixing frame 201, a first connecting frame 205 and a first hydraulic cylinder 203. The first fixing frame 201 is fixedly installed at the bottom of the main frame 1, and the first connecting frame 205 is fixedly installed on one side of the connecting plate 3. A first rotating seat 202 is rotatably installed inside the first fixed frame 201. A first hydraulic cylinder 203 is fixedly installed on one side of the first rotating seat 202. A first connecting plate 204 is fixedly installed on the output end of the first hydraulic cylinder 203. The first connecting plate 204 is rotatably installed inside the first connecting frame 205.

[0017] In this embodiment, the third hydraulic folding mechanism 6 includes: a third fixing frame 601, a horizontal plate 605 and a third hydraulic cylinder 603. The third fixing frame 601 is fixedly installed on the top of the subframe 5, and the horizontal plate 605 is fixedly installed on one side of the extension plate 7. A third rotating seat 602 is rotatably installed inside the third fixed frame 601. A third hydraulic cylinder 603 is fixedly installed on one side of the third rotating seat 602. A third connecting plate 604 is fixedly installed on the output end of the third hydraulic cylinder 603. The third connecting plate 604 is hinged to the top of the horizontal plate 605.

[0018] In this embodiment, the second hydraulic folding mechanism 4 includes: a second fixing frame 401, a second connecting frame 405, and a second hydraulic cylinder 403. The second fixing frame 401 is fixedly installed on one side of the connecting plate 3, and the second connecting frame 405 is fixedly installed on the top of the subframe 5. A second rotating seat 402 is rotatably installed inside the second fixed frame 401. A second hydraulic cylinder 403 is fixedly installed on one side of the second rotating seat 402. A second connecting plate 404 is fixedly installed on the output end of the second hydraulic cylinder 403. The second connecting plate 404 is rotatably installed inside the second connecting frame 405.

[0019] In this embodiment, a lower ear plate 301 is fixedly installed at the bottom of the connecting plate 3, and the lower ear plate 301 is rotatably installed in the main frame 1. An upper ear plate 302 is fixedly installed at the top of the connecting plate 3, and the upper ear plate 302 is rotatably installed in the sub-frame 5.

[0020] In this embodiment, a hinge plate 701 is fixedly installed on the top of the extension plate 7, and the hinge plate 701 is rotatably installed in the subframe 5. A handle 801 is connected to the front side of the controller 8.

[0021] In this embodiment, during use, the controller 8 sends control information to the first hydraulic cylinder 203, the second hydraulic cylinder 403 and the third hydraulic cylinder 603. The contraction of the first hydraulic cylinder 203 will generate a pulling force. Since the cylinder end of the first hydraulic cylinder 203 is installed in the first fixed frame 201 at the bottom of the main frame 1 through the first rotating seat 202, this force will drive the entire connecting plate 3 to rotate clockwise around its hinge point with the main frame 1 (at the lower ear plate 301) until the connecting plate 3 and the main frame 1 are on the same horizontal plane. After receiving the control information, the second hydraulic cylinder 403 controls its piston rod to retract, pulling the second connecting plate 404. The second connecting plate 404 is rotatably installed in the second connecting frame 405 fixed on the top of the subframe 5. Since the cylinder end of the second hydraulic cylinder 403 is installed on the connecting plate 3 through the second rotating seat 402, this force will drive the entire subframe 5 to rotate clockwise around its hinge point with the connecting plate 3 (at the upper ear plate 302) until the subframe 5 is in a horizontal state. The piston rod of the third hydraulic cylinder 603 retracts into the cylinder body, pulling the third connecting plate 604 fixed thereto. The third connecting plate 604 is hinged to the horizontal plate 605, and the horizontal plate 605 is fixed to one side of the extension plate 7. This pulling force will force the extension plate 7 to rotate clockwise with its hinge point with the subframe 5 (hinged plate 701) as the axis until the extension plate 7 is in a horizontal state. At this point, the connecting plate 3, the subframe 5 and the extension plate 7 are all horizontally unfolded to facilitate the unfolding of more cargo. When these actions are required, the controller 8 sends a retraction command to the first hydraulic cylinder 203, the second hydraulic cylinder 403, and the third hydraulic cylinder 603, causing the extension plate 7 to first rotate counterclockwise and fold 180°, and then the connecting plate 3 and the subframe 5 to rotate counterclockwise 90° respectively to complete the folding, achieving the effect of significantly reducing the floor space occupied.

[0022] The above provides a detailed description of a hydraulic folding device for a trailer bed provided by this utility model. Specific embodiments have been used to illustrate the principle and implementation of this utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A hydraulic folding device for a trailer bed, characterized in that, include: The vehicle consists of a main frame (1), a subframe (5), a connecting plate (3), and an extension plate (7). One end of the connecting plate (3) is hinged to the main frame (1). The connecting plate (3) and the main frame (1) are provided with a first hydraulic folding mechanism (2). The other end of the connecting plate (3) is hinged to the subframe (5). The top of the connecting plate (3) is provided with a second hydraulic folding mechanism (4). The extension plate (7) is hinged to the other end of the subframe (5). The top of the subframe (5) is provided with a third hydraulic folding mechanism (6). The bottom of the main frame (1) is provided with a controller (8).

2. The hydraulic folding device for trailer beds according to claim 1, characterized in that, The first hydraulic folding mechanism (2) includes: a first fixed frame (201), a first connecting frame (205) and a first hydraulic cylinder (203). The first fixed frame (201) is fixedly installed at the bottom of the main frame (1), and the first connecting frame (205) is fixedly installed on one side of the connecting plate (3). A first rotating seat (202) is rotatably installed inside the first fixed frame (201). The first hydraulic cylinder (203) is fixedly installed on one side of the first rotating seat (202). A first connecting plate (204) is fixedly installed on the output end of the first hydraulic cylinder (203). The first connecting plate (204) is rotatably installed inside the first connecting frame (205).

3. The hydraulic folding device for trailer beds according to claim 1, characterized in that, The third hydraulic folding mechanism (6) includes: a third fixed frame (601), a horizontal plate (605) and a third hydraulic cylinder (603). The third fixed frame (601) is fixedly installed on the top of the subframe (5), and the horizontal plate (605) is fixedly installed on one side of the extension plate (7). The third fixed frame (601) is rotatably installed with a third rotating seat (602), the third hydraulic cylinder (603) is fixedly installed on one side of the third rotating seat (602), and a third connecting plate (604) is fixedly installed on the output end of the third hydraulic cylinder (603). The third connecting plate (604) is hinged to the top of the horizontal plate (605).

4. The hydraulic folding device for trailer beds according to claim 1, characterized in that, The second hydraulic folding mechanism (4) includes: a second fixed frame (401), a second connecting frame (405), and a second hydraulic cylinder (403). The second fixed frame (401) is fixedly installed on one side of the connecting plate (3), and the second connecting frame (405) is fixedly installed on the top of the subframe (5). A second rotating seat (402) is rotatably installed inside the second fixed frame (401). The second hydraulic cylinder (403) is fixedly installed on one side of the second rotating seat (402). A second connecting plate (404) is fixedly installed on the output end of the second hydraulic cylinder (403). The second connecting plate (404) is rotatably installed inside the second connecting frame (405).

5. The hydraulic folding device for trailer beds according to claim 1, characterized in that, The bottom of the connecting plate (3) is fixedly installed with a lower ear plate (301), which is rotatably installed in the main frame (1). The top of the connecting plate (3) is fixedly installed with an upper ear plate (302), which is rotatably installed in the sub-frame (5).

6. The hydraulic folding device for trailer beds according to claim 1, characterized in that, A hinge plate (701) is fixedly installed on the top of the extension plate (7), and the hinge plate (701) is rotatably installed in the subframe (5). A handle (801) is connected to the front side of the controller (8).

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