Tailgate structure with pressure regulation function

Abstract

The utility model discloses a tailboard structure with pressure regulating function, including support frame, force arm, inclined plate, lifting oil cylinder, flap oil cylinder and pressure regulator. Force arm rotatably is arranged on support frame, and is provided with triangular plate on inclined plate, and the crank of lifting oil cylinder and force arm is connected with follow-up frame, and flap oil cylinder is connected with the top angle of triangular plate. Lifting oil cylinder and flap oil cylinder all adopt the design of exhaust -free piston. Pressure regulator is connected between the oil circuit of lifting oil cylinder and flap oil cylinder, and the pressure balance and action coordination among multiple cylinders are realized through adjusting hydraulic oil flow. The utility model simplifies the structure, and through pressure regulator and optimized triangular plate connecting rod mechanism, the stability and synchronism of tailboard lifting and overturning process are ensured, and the reliability and service life are improved.

Description

Technical Field

[0001] This utility model relates to the field of logistics equipment, and in particular to a loading and unloading device for the rear of a vehicle, specifically a tailgate structure with pressure regulation function. Background Technology

[0002] Existing tailgate structures typically use hydraulic cylinders for drive, but hydraulic cylinders require venting and pressure relief circuits, resulting in complex structures. Some tailgates use balancing cylinders to balance the pressure of the tipping cylinder and the lifting cylinder, but these balancing cylinders increase structural complexity and manufacturing costs. Therefore, it is necessary to provide a simpler and more reliable tailgate structure. Utility Model Content

[0003] This invention aims to solve the problems of complex structure and high cost in the prior art, and proposes a tailplate structure with exhaust-free piston cylinder and pressure regulation, which achieves oil circuit pressure balance through pressure regulator to ensure coordinated operation.

[0004] A tailplate structure with pressure regulation function according to a first aspect embodiment of the present invention is characterized in that it comprises: A support frame, the support frame including a crossbeam, and an outer support plate and an inner support plate disposed at both ends of the crossbeam; At least two lever arms are rotatably mounted on the support frame. Each lever arm includes a follower frame with one end rotatably connected to the inner support plate, and a main arm rotatably hinged to the middle of the follower frame. A crank arm is provided at the end of the main arm away from the follower frame. An inclined plate, wherein a triangular plate is provided on the inclined plate, one side of the triangular plate is in contact with the inclined plate, and the end of the inclined plate is provided with an inclination angle for contacting the ground; At least two lifting cylinders for raising the lever arm, one end of the lifting cylinder being rotatably hinged to the other end of the follower frame, and the other end being connected to the lower end of the crank arm; At least two hydraulic cylinders for folding the inclined plate, wherein the apex of the triangular plate away from the inclined plate is rotatably connected to one end of the hydraulic cylinder; Both the lifting cylinder and the tilting cylinder include a fixed end, a movable end, and a non-venting piston, with a one-way valve at the center of the non-venting piston. A pressure regulator is used to regulate the flow of hydraulic oil, and the pressure regulator is connected between the oil circuits of the lifting cylinder and the flap cylinder.

[0005] According to an embodiment of the present invention, a tailgate structure with pressure regulation function has at least the following beneficial effects: The present invention simplifies the structure and reduces costs by connecting the oil circuits of multiple lifting cylinders and tilting cylinders through a pressure regulator. In this embodiment, the lever arm, through the setting of a follower frame and the hinge structure of the main arm, allows the tilting plate to switch between a horizontal state and an end-touching tilted state even when it is at its lowest point, thanks to the fine adjustment of the lifting cylinder. This facilitates the tool cart entering the tilting plate from its end. The linkage structure of the follower frame replaces the traditional balance cylinder, achieving the goal of cost reduction and efficiency improvement. Furthermore, the pressure regulator can dynamically adjust the flow and pressure distribution of hydraulic oil among multiple cylinders, ensuring that lifting and tilting actions are performed synchronously on both sides, avoiding jamming or structural deformation caused by uneven load or uneven oil circuit pressure. The triangular plate optimizes the force structure of the tilting cylinder, making the tilting action smoother. Simultaneously, the design of the exhaust-free piston and one-way valve avoids the exhaust requirements of traditional cylinders, further simplifying the cylinder structure and improving reliability and service life.

[0006] According to some embodiments of the present invention, the one-way valve includes a valve body with a tapered orifice, a valve core that cooperates with the tapered orifice, and a baffle that restricts the valve core from sliding out of the tapered orifice.

[0007] According to some embodiments of the present invention, the inclined plate is provided with transverse ribs to enhance its resistance to deformation.

[0008] According to some embodiments of this utility model, a fixing plate for installing the pressure regulator is provided in the middle of the crossbeam, and the pressure regulator is connected to the lifting cylinder and the flap cylinder through a pipeline.

[0009] According to some embodiments of the present invention, the pressure regulator is a hydraulic integrated block structure, which has interconnected oil passages inside, including a main oil inlet passage, a lifting oil passage, a flap oil passage and a return oil passage, and an adjustable differential pressure valve is provided between the lifting oil passage and the flap oil passage.

[0010] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0011] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is another structural schematic diagram of an embodiment of the present utility model; Figure 3 This is a schematic diagram of the oil circuit in an embodiment of the present invention; Figure 4 This is a diagram showing the internal structure of the lifting cylinder according to an embodiment of the present invention.

[0012] 100. Support frame; 110. Outer support plate; 130. Inner support plate; 140. Crossbeam; 150. Fixed plate; 200. Lever arm; 210. Follower frame; 220. Main boom; 240. Crank arm; 300. Inclined plate; 310. Horizontal rib; 400. Lifting cylinder; 410. Fixed end; 450. Air-free piston; 460. Check valve; 461. Valve body; 462. Valve core; 463. Baffle; 500. Flip cylinder; 700. Pressure regulator. Detailed Implementation

[0013] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0014] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0015] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0016] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0017] Example 1 Reference Figure 1-3 A tailgate structure with pressure regulation function includes a support frame 100, a lever arm 200, an inclined plate 300, a lifting cylinder 400, a flap cylinder 500, and a pressure regulator 700.

[0018] The support frame 100 is used to secure the entire tailgate structure to the rear of the vehicle. The support frame 100 includes a crossbeam 140. Each end of the crossbeam 140 is provided with an outer support plate 110 and an inner support plate 130. The outer support plate 110 and the inner support plate 130 together provide multiple connection points.

[0019] Reference Figure 1 , Figure 2 and Figure 3 At least two lever arms 200 are rotatably mounted on the support frame 100. Specifically, each lever arm 200 includes a follower frame 210 rotatably connected at one end to the inner support plate 130, and a main arm 220 rotatably hinged to the middle of the follower frame 210. A crank arm 240 is provided at the end of the main arm 220 away from the follower frame 210. The crank arm 240 and the lever arm 200 can be integrally formed or fixedly connected by welding or fasteners.

[0020] The inclined plate 300 is the main component for supporting goods. The inclined plate 300 is connected to the upper end of the crank arm 240 via a hinge point. The end of the inclined plate 300 closest to the ground has an angle, which allows it to smoothly conform to the ground when lowered, facilitating loading and unloading of goods. A triangular plate is fixedly mounted on the inclined plate 300. One side of the triangular plate is firmly attached to the surface of the inclined plate 300. It is conceivable that the triangular plate can be connected to the inclined plate 300 by welding or bolts.

[0021] At least two lifting cylinders 400 are used to provide lifting power. The cylinder body end (fixed end 410) of the lifting cylinder 400 is rotatably hinged to the other end of the follower frame 210. The piston rod end (movable end) of the lifting cylinder 400 is hinged to the lower end of the crank arm 240. By extending and retracting the lifting cylinder 400, the lever arm 200 can be driven to rotate around its hinge point with the support frame 100, thereby realizing the overall lifting and lowering of the inclined plate 300. In addition, in this embodiment, the lever arm is provided with a follower frame and a hinged structure of the main arm, so that when the inclined plate is at its lowest point, the lifting cylinder can be finely adjusted to switch the inclined plate from a horizontal state to an inclined state with its end touching the ground, which facilitates the tool cart to enter the inclined plate from the end of the inclined plate. The linkage structure of the follower frame replaces the traditional balance cylinder, achieving the purpose of cost reduction and efficiency improvement.

[0022] At least two tilting cylinders 500 are used to provide the tilting power. The cylinder body end of the tilting cylinder 500 is hinged to the support frame 100. The piston rod end of the tilting cylinder 500 is hinged to the apex of the triangular plate away from the inclined plate 300. This connection forms a lever mechanism that can efficiently drive the inclined plate 300 to tilt around its hinge point with the crank arm 240 when the tilting cylinders 500 extend or retract.

[0023] Reference Figure 4Both the lifting cylinder 400 and the tilting cylinder 500 adopt a design with a non-venting piston 450. The non-venting piston 450 is located inside the cylinder, and a one-way valve 460 is integrated in its center.

[0024] Pressure regulator 700 is used to regulate the flow of oil in the hydraulic system. Pressure regulator 700 is connected between the oil circuit of lifting cylinder 400 and the oil circuit of flap cylinder 500 via hydraulic lines.

[0025] The beneficial effects of this embodiment are as follows: By setting a pressure regulator 700 to connect the hydraulic circuits of the lifting cylinder 400 and the tilting cylinder 500, the mechanical structure is simplified, and manufacturing costs and potential failure points are reduced. The pressure regulator 700 can dynamically adjust the pressure and flow between the two hydraulic circuits, ensuring that multiple cylinders maintain coordinated and synchronized operation even when subjected to asymmetrical loads, effectively preventing structural jamming. The triangular plate optimizes the lever arm of the tilting cylinder 500, making the tilting action smoother and less strenuous. The design of the exhaust-free piston 450 eliminates the need for a complex exhaust structure, simplifies the cylinder, and improves reliability.

[0026] Example 2 Based on Example 1, referring to Figure 4 Further explanation is given regarding the one-way valve 460.

[0027] The one-way valve 460 includes a valve body 461, a valve core 462, and a baffle 463. The valve body 461 has a tapered bore inside. The valve core 462 is shaped to fit within the tapered bore and is used to seal or open the oil passage. The baffle 463 is fixedly mounted on the valve body 461 and its function is to prevent the valve core 462 from completely sliding out of the tapered bore.

[0028] When hydraulic oil flows from the fixed end 410 to the movable end, the oil pressure pushes the valve core 462 tightly against the tapered hole, closing the oil passage and achieving a one-way shut-off function. When it is necessary to allow the oil accumulated on the piston rod side to flow back, the oil pressure pushes the valve core 462 away from the tapered hole and moves towards the baffle 463, opening the oil passage and allowing the oil to flow back to the chamber of the fixed end 410.

[0029] The beneficial effects of this embodiment are as follows: the one-way valve 460 has a simple structure and reliable operation. It can effectively restrict the one-way flow of oil, ensuring pressure maintenance during lifting and flapping processes. At the same time, it can open in time during reset, allowing trapped oil to flow back, avoiding the problem of piston rod stroke being obstructed due to oil accumulation, and ensuring the accuracy and reliability of tailplate operation.

[0030] Example 3 Based on Example 1 or 2, refer to Figure 1-3 A horizontal rib 310 is provided on the inclined plate 300. The horizontal rib 310 can be formed on the inclined plate 300 by stamping, or it can be a separately welded reinforcing rib structure.

[0031] The beneficial effects of this embodiment are as follows: the transverse ribs 310 significantly enhance the structural rigidity of the inclined plate 300, improving its resistance to bending and deformation. During loading and unloading of heavy goods, this design effectively prevents plastic deformation or damage to the inclined plate 300, extending the service life of the tail plate and improving equipment safety.

[0032] Example 4 Based on any one of Examples 1 to 3, referring to Figure 1-3 A fixing plate 150 is provided at the middle position of the crossbeam 140. The pressure regulator 700 is mounted on the fixing plate 150 by bolts. The pressure regulator 700 is connected to the lifting cylinder 400 and the flap cylinder 500 by a metal pipe or a high-pressure hose.

[0033] The beneficial effects of this embodiment are as follows: the fixing plate 150 provides a centralized and stable mounting position for the pressure regulator 700, making the hydraulic pipeline layout more regular and compact. This integrated installation reduces pipeline clutter, lowers the risk of pipeline wear or loosening caused by vehicle vibration, and facilitates on-site installation and subsequent maintenance.

[0034] Example 5 Based on any one of Examples 1 to 4, referring to Figure 1-3 Further explanation is given regarding the pressure regulator 700.

[0035] The pressure regulator 700 is specifically a hydraulic integrated block structure. It has interconnected oil passages machined internally. These passages include a main inlet oil passage, a lifting oil passage, a flap oil passage, and a return oil passage. The lifting oil passage branches connect to the rodless chambers of the two lifting cylinders 400. The flap oil passage branches connect to the rodless chambers of the two flap cylinders 500. An adjustable differential pressure valve is integrated between the lifting oil passage and the flap oil passage.

[0036] Understandably, the adjustable differential pressure valve can sense the pressure difference between the two oil circuits in real time. When pressure imbalance occurs due to uneven load, the adjustable differential pressure valve will automatically adjust the valve core opening, guiding some oil from the high-pressure side to the low-pressure side to compensate, thereby achieving pressure balance and synchronized operation between the lifting cylinder 400 and the flap cylinder 500. In addition, the pressure regulator 700 includes a directional control valve, which is connected to an external hydraulic pump and oil tank, controlling the direction of hydraulic oil flow between the oil tank, hydraulic pump, and adjustable differential pressure valve.

[0037] The advantages of this embodiment are as follows: the pressure regulator 700, which adopts a hydraulic integrated block structure, integrates the complex oil circuit and valve body into one unit, resulting in a compact structure, fewer leakage points, and high reliability. The internal adjustable differential pressure valve can automatically and accurately balance the pressure between the lifting and tilting actions, ensuring that even under off-center load conditions, the lifting and tilting of the tail plate can be carried out smoothly and synchronously, greatly improving the working performance and operational safety of the equipment.

[0038] The embodiments described above with reference to the accompanying drawings have been described in detail. However, the embodiments are not limited to those described above. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the invention.

Claims

1. A tailplate structure with pressure regulation function, characterized in that, include: The support frame (100) includes a crossbeam (140) and an outer support plate (110) and an inner support plate (130) disposed at both ends of the crossbeam (140). At least two lever arms (200) are rotatably mounted on the support frame (100). Each lever arm (200) includes a follower frame (210) rotatably connected at one end to the inner support plate (130) and a main arm (220) rotatably hinged to the middle of the follower frame (210). A crank arm (240) is provided at the end of the main arm (220) away from the follower frame (210). Inclined plate (300), on which a triangular plate is provided, one side of which is in contact with the inclined plate, and the end of the inclined plate (300) is provided with an inclination angle for contacting the ground; At least two lifting cylinders (400) for lifting the lever arm (200), one end of the lifting cylinder (400) is rotatably hinged to the other end of the follower frame, and the other end is connected to the lower end of the crank arm (240); At least two flipping cylinders (500) for flipping the inclined plate (300), wherein the apex of the triangular plate away from the inclined plate is rotatably connected to one end of the flipping cylinder (500); Both the lifting cylinder (400) and the flap cylinder (500) include a fixed end (410), a movable end, and a non-venting piston (450), with a one-way valve (460) at the center of the non-venting piston (450). A pressure regulator (700) is used to regulate the flow of hydraulic oil. The pressure regulator (700) is connected between the oil circuits of the lifting cylinder (400) and the flap cylinder (500).

2. The tailplate structure with pressure regulation function according to claim 1, characterized in that: The one-way valve (460) includes a valve body (461) with a tapered orifice, a valve core (462) that engages with the tapered orifice, and a baffle (463) that restricts the valve core from sliding out of the tapered orifice.

3. The tailplate structure with pressure regulation function according to claim 1, characterized in that: The inclined plate (300) is provided with transverse ribs (310) to enhance its resistance to deformation.

4. The tailplate structure with pressure regulation function according to claim 1, characterized in that: A fixing plate (150) for installing the pressure regulator (700) is provided in the middle of the crossbeam (140). The pressure regulator (700) is connected to the lifting cylinder (400) and the flap cylinder (500) through pipes.

5. The tailplate structure with pressure regulation function according to claim 1, characterized in that: The pressure regulator (700) is a hydraulic integrated block structure with interconnected oil passages inside, including a main oil inlet passage, a lifting oil passage, a flap oil passage and a return oil passage. An adjustable differential pressure valve is provided between the lifting oil passage and the flap oil passage.

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