Built-in lifter

Abstract

The utility model discloses a built-in lifter which comprises a base, a lifting arm, a lifting oil cylinder, a follow-up arm, a vertical arm, a door closing oil cylinder and a bearing platform. The base is fixed on a vehicle bottom plate without depending on a girder; the lifting arm is hinged to the base and is driven to rotate through a lifting oil cylinder; the follow-up arm and the vertical arm form a parallelogram mechanism to drive the bearing platform to move up and down; the door closing oil cylinder achieves switching between the horizontal state and the vertical state of the bearing platform. Compact design is adopted, space layout is optimized, the effective width of the bearing platform is increased, the problem that a traditional hydraulic tail plate cannot be installed on a full-bearing or half-bearing vehicle body due to insufficient girder strength is solved through a built-in structure, and meanwhile the appearance of the vehicle is kept attractive. The utility model is suitable for integral type van trucks and part of special vehicles.

Description

Technical Field

[0001] This utility model relates to the field of automotive modification technology, and in particular to an internal lift device. Background Technology

[0002] In the logistics industry, hydraulic tailgates, as a type of vehicle-mounted lifting device used for loading and unloading goods, are widely used due to their ease of operation. Traditional hydraulic tailgates are typically fixed to the vehicle's frame, retracting at the rear of the vehicle during driving and lowered for use. However, this traditional hydraulic tailgate's overall structure is entirely external to the vehicle, inevitably altering the vehicle's rear appearance. This is especially problematic for unibody vans (like minivans) and vehicles with partially monocoque or semi-monocoque bodies, where the rear structure presents numerous challenges for installing hydraulic tailgates. Firstly, the impact on appearance is significant, potentially reducing the vehicle's aesthetics. Secondly, because hydraulic tailgates must be fixed to the vehicle's frame, some vehicles lack sufficiently strong frames to provide installation space, making traditional hydraulic tailgates unusable. This limitation makes loading and unloading cargo difficult for vehicles with fully or partially monocoque designs, particularly when handling large or heavy loads. Relying solely on manual operation is not only inefficient but also presents significant labor intensity and safety hazards. Therefore, how to solve the problem of not being able to install lifting devices on such vehicles due to structural limitations, while also ensuring the integrity of the vehicle's appearance, has become an urgent technical challenge. Utility Model Content

[0003] The purpose of this utility model is to provide an internal lifting device that solves the problems mentioned in the background art.

[0004] This utility model is implemented as follows: an internal lifting device.

[0005] The system includes a base, lifting arm, lifting cylinder, follower arm, vertical arm, door closing cylinder, and a carrying platform. The base is fixed to the vehicle floor via bolts or welding, eliminating the need for a vehicle frame. The lifting arm is hinged to the base and driven to rotate by the lifting cylinder. One end of the lifting cylinder is hinged to the base, and the other end is hinged to the lifting arm, propelling the lifting arm to rotate around its hinge point with the base. One end of the follower arm is hinged to the base, and the other end is hinged to the vertical arm, forming a parallelogram mechanism with the lifting arm and vertical arm. The lower end of the vertical arm is hinged to the follower arm, and the upper end is fixedly connected to the carrying platform, driving the carrying platform to move up and down. One end of the door closing cylinder is hinged to the vertical arm, and the other end is hinged to the carrying platform, driving the carrying platform to switch between vertical and horizontal positions. The carrying platform is a rectangular frame structure used to carry goods and has two states: horizontally extended and vertically retracted.

[0006] Furthermore, the base is equipped with a reinforcing rib structure to improve the reliability of its connection with the vehicle floor. The reinforcing rib structure of the base is manufactured through a stamping process to ensure sufficient strength and rigidity. The mounting holes of the base are designed as elongated oval holes, allowing for a certain range of installation error adjustment, facilitating on-site installation operations.

[0007] Specifically, both the lifting arm and the follower arm are made of high-strength alloy steel and undergo heat treatment to improve their fatigue resistance. The length of the lifting arm is equal to that of the follower arm, and both form a parallelogram mechanism with the base and the vertical arm. The rotation angle range of the lifting arm is set between 0 and 90 degrees to ensure that the supporting platform can smoothly switch between vertical and horizontal positions.

[0008] The stroke of the lifting cylinder is matched to the rotation angle of the lifting arm, and precise control of the lifting arm's rotation angle is achieved by controlling the extension and retraction of the lifting cylinder. The piston rod diameter of the lifting cylinder is calculated and determined based on the maximum load conditions, with a 20% safety factor included. Both ends of the lifting cylinder are equipped with spherical bearings to compensate for installation errors and minor displacements during operation.

[0009] Furthermore, a self-lubricating copper sleeve is provided at the connection between the follower arm and the vertical arm to reduce frictional resistance during movement and extend service life. The follower arm has a rectangular tubular cross-section, ensuring sufficient strength while reducing overall weight. The length of the follower arm is consistent with the length of the lifting arm to ensure the motion characteristics of the parallelogram mechanism.

[0010] Specifically, the upper end of the vertical arm is equipped with a locating pin for precise positioning and connection with the supporting platform. The main structure of the vertical arm adopts a box girder design with multiple transverse baffles inside to improve its bending stiffness. The surface of the vertical arm is sandblasted and then coated with an anti-corrosion coating to enhance its corrosion resistance.

[0011] The stroke of the closing cylinder is matched to the rotation angle of the support platform, and precise control of the platform's state is achieved by controlling the extension and retraction of the closing cylinder. The piston rod diameter of the closing cylinder is calculated and determined based on the maximum load conditions, with a 25% safety factor included. Both ends of the closing cylinder are equipped with spherical bearings to compensate for installation errors and minor displacements during operation.

[0012] Furthermore, the frame of the carrying platform is welded from rectangular steel pipes, and the surface is covered with anti-slip patterned steel plates. Removable guardrails are installed around the carrying platform, with a guardrail height of 120 mm, to prevent goods from slipping during transportation. Multiple reinforcing ribs are installed at the bottom of the carrying platform to improve its load-bearing capacity.

[0013] In particular, this invention adopts a compact design, partially overlapping the spaces of the lifting cylinder and the lifting arm to make full use of limited space. Specifically, the cylinder body of the lifting cylinder is embedded in the internal space of the lifting arm. By rationally arranging the installation position of the cylinder, the effective usable width of the load-bearing platform is maximized even when vehicle width is limited. Calculations show that this design increases the effective usable width of the load-bearing platform by 30% compared to traditional designs.

[0014] The working process of this utility model includes the following steps: S1: Open the rear door of the vehicle, start the system, the lifting cylinder begins to extend, and pushes the lifting arm to rotate; S2: The rotational motion of the lifting arm is transmitted to the vertical arm through the parallelogram mechanism, causing the carrying platform to move downward; S3: When the carrying platform moves to a near-horizontal position, the closing cylinder begins to retract, causing the carrying platform to rotate to a completely horizontal state; S4: After the cargo loading and unloading operation is completed, the closing cylinder extends, causing the carrying platform to rotate to a vertical state; S5: The lifting cylinder retracts, pulling the lifting arm to rotate in the opposite direction, and driving the carrying platform upward through the parallelogram mechanism until it is completely retracted into the vehicle compartment.

[0015] Furthermore, the installation process of this utility model includes the following steps: S1: Determine the installation position of the base and use a laser level to ensure the flatness of the installation reference surface; S2: Mark the position of the base mounting holes on the vehicle floor and use drilling equipment to process the mounting holes; S3: Place the base in the predetermined position and fix it with high-strength bolts, with the bolt tightening torque set to 300 Nm; S4: Install the lifting arm, follower arm, vertical arm, and load-bearing platform in sequence, ensuring the relative positional accuracy between each component; S5: Install the lifting cylinder and door closing cylinder, and adjust the preload of each joint bearing to the specified value.

[0016] Specifically, the technical effects of this utility model are reflected in the following aspects: By adopting an internal structure, it solves the problem that vehicles with fully or semi-load-bearing body designs cannot install traditional hydraulic tailgates due to insufficient beam strength. By integrating the entire lifting system inside the vehicle body, it eliminates the impact on the appearance and maintains the overall aesthetics of the vehicle. Through compact design and space optimization, it maximizes the effective usable width of the load-bearing platform under limited vehicle width conditions. Through the design of the parallelogram mechanism, it ensures the stability and reliability of the load-bearing platform during movement. Through precise control system design, it achieves accurate switching between vertical and horizontal states of the load-bearing platform, improving the convenience and safety of operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a traditional hydraulic tailgate in the driving state;

[0018] Figure 2This is a schematic diagram of a traditional hydraulic tailgate in operation.

[0019] Figure 3 This is a schematic diagram of the composition and structure of the internal lifting device of this utility model;

[0020] Figure 4 This is a schematic diagram of the built-in lifting device of this utility model in the retracted state;

[0021] Figure 5 This is a schematic diagram of the internal lifting device of this utility model in the unfolded state.

[0022] The attached diagram is labeled as follows: 1. Base; 2. Lifting arm; 3. Lifting cylinder; 4. Follower arm; 5. Vertical arm; 6. Door closing cylinder; 7. Load-bearing platform. Detailed Implementation

[0023] This utility model relates to an internal lift device, applicable to integral vans and vehicles with monocoque or semi-monocoque body designs. By combining... Figures 3 to 5 The accompanying drawings, including reference numerals 1 to 1, detail the specific structure and function of each component, and provide a detailed description of the specific embodiments of this utility model. First, the structure of each component and its installation method are described, followed by an explanation of the working principle, operation process, and practical application scenarios.

[0024] Base 1 is the core fixing component of the entire lifting device, which is fixed to the vehicle floor plate by bolts or welding. Base 1 is made of high-strength steel plate and has a reinforcing rib structure to enhance its rigidity. The reinforcing rib structure is manufactured through a stamping process to ensure that Base 1 has sufficient strength when bearing large loads. The mounting holes of Base 1 are designed in the form of elongated ovals, allowing for a certain range of installation error adjustment, which facilitates on-site operation. During installation, a laser level is used to determine the flatness of the mounting reference surface of Base 1 to ensure the precise assembly of subsequent components. There are two Base 1s, symmetrically arranged on both sides of the vehicle floor plate, providing a stable support foundation.

[0025] The lifting arm 2 is hinged to the base 1, forming a rotatable kinematic pair. The lifting arm 2 is made of high-strength alloy steel and undergoes heat treatment to improve its fatigue resistance. One end of the lifting cylinder 3 is hinged to the base 1, and the other end is hinged to the lifting arm 2, driving the lifting arm 2 to rotate around its hinge point with the base 1. The stroke of the lifting cylinder 3 is designed to match the rotation angle of the lifting arm 2, ensuring that the supporting platform 7 can smoothly switch between vertical and horizontal positions. The piston rod diameter of the lifting cylinder 3 is calculated based on the maximum load conditions, with a 20% safety factor. Both ends of the lifting cylinder 3 are equipped with spherical bearings to compensate for installation errors and minor displacements during operation. The length of the lifting arm 2 is designed to be equal to that of the follower arm 4, together forming a parallelogram mechanism.

[0026] One end of the follower arm 4 is hinged to the base 1, and the other end is hinged to the vertical arm 5. The cross-sectional shape of the follower arm 4 is rectangular tubular, which ensures sufficient strength while reducing the overall weight. The length of the follower arm 4 is consistent with that of the lifting arm 2, ensuring the motion characteristics of the parallelogram mechanism. A self-lubricating copper sleeve is provided at the connection between the follower arm 4 and the vertical arm 5 to reduce frictional resistance during movement and extend service life. The lower end of the vertical arm 5 is hinged to the follower arm 4, and the upper end is fixedly connected to the bearing platform 7, used to drive the bearing platform 7 to complete the up and down movement. The main structure of the vertical arm 5 adopts a box beam design with multiple transverse baffles inside to improve its bending stiffness. The surface of the vertical arm 5 is sandblasted and then coated with an anti-corrosion coating to enhance its corrosion resistance. A positioning pin is provided at the upper end of the vertical arm 5 for precise positioning and connection with the bearing platform 7.

[0027] The carrying platform 7 is a rectangular frame structure welded from rectangular steel pipes, with a surface covered with anti-slip patterned steel plates to ensure safety during cargo transportation. Removable guardrails, 120 mm high, are installed around the carrying platform 7 to prevent goods from slipping during transport. Multiple reinforcing ribs are installed at the bottom of the carrying platform 7 to further enhance its load-bearing capacity. One end of the closing cylinder 6 is hinged to the vertical arm 5, and the other end is hinged to the carrying platform 7, used to drive the carrying platform 7 to switch between vertical and horizontal positions. The stroke of the closing cylinder 6 is designed to match the rotation angle of the carrying platform 7 to ensure accurate transition between the two states. The piston rod diameter of the closing cylinder 6 is calculated based on the maximum load conditions, with a 25% safety factor. Both ends of the closing cylinder 6 are also equipped with spherical bearings to compensate for installation errors and minor displacements during operation.

[0028] The working process of this utility model is as follows: S1 Open the rear door of the vehicle, start the system, and the lifting cylinder 3 begins to extend, pushing the lifting arm 2 to rotate; S2 The rotational motion of the lifting arm 2 is transmitted to the vertical arm 5 through the parallelogram mechanism, causing the carrying platform 7 to move downward; S3 When the carrying platform 7 moves to a near-horizontal position, the closing cylinder 6 begins to retract, causing the carrying platform 7 to rotate to a completely horizontal state; S4 After the cargo loading and unloading operation is completed, the closing cylinder 6 extends, causing the carrying platform 7 to rotate to a vertical state; S5 The lifting cylinder 3 retracts, pulling the lifting arm 2 to rotate in the opposite direction, and driving the carrying platform 7 to move upward through the parallelogram mechanism until it is completely retracted into the vehicle compartment. Throughout the process, the coordination and stability of the movement of each component are ensured by the design of the parallelogram mechanism, ensuring that the carrying platform 7 remains stable during movement.

[0029] The installation process of this utility model includes the following steps: S1 Determine the installation position of the base 1 and use a laser level to ensure the flatness of the installation reference surface; S2 Mark the positions of the mounting holes of the base 1 on the vehicle floor and use drilling equipment to process the mounting holes; S3 Place the base 1 in the predetermined position and fix it with high-strength bolts, with the bolt tightening torque set to 300 Nm; S4 Install the lifting arm 2, the following arm 4, the vertical arm 5, and the bearing platform 7 in sequence, ensuring the relative positional accuracy between each component; S5 Install the lifting cylinder 3 and the closing cylinder 6, and adjust the preload of each joint bearing to the specified value. Through the above installation steps, the overall structure of the lift is ensured to be solid and reliable, meeting the actual use requirements.

[0030] The practical application scenarios of this utility model are mainly aimed at integrated van trucks and vehicles with fully or semi-load-bearing body designs. For example, Hubei Jiulin Machinery Equipment Co., Ltd. has adopted this solution to achieve mass production of the lifting device, providing a highly adaptable product for some special-purpose vehicles. In practical applications, vehicle drivers can easily complete loading and unloading operations by simply following standard operating procedures. Taking an integrated van truck as an example, when loading and unloading goods, the driver first opens the rear door of the vehicle, starts the lifting system, and the carrying platform 7 unfolds from inside the truck bed to the outside and is adjusted to a horizontal position. At this time, the carrying platform 7 can serve as a temporary loading and unloading platform, facilitating the operation of forklifts or other loading and unloading equipment. After loading and unloading the goods, the driver operates the lifting device through the control panel to restore the carrying platform 7 to a vertical position and retract it into the truck bed, and finally closes the rear door of the vehicle. The entire process requires no external auxiliary equipment, significantly improving loading and unloading efficiency, while avoiding the impact of traditional hydraulic tailgates on the appearance.

[0031] This utility model's compact design partially overlaps the spaces of the lifting cylinder 3 and the lifting arm 2, making full use of limited space. Specifically, the cylinder body of the lifting cylinder 3 is embedded in the internal space of the lifting arm 2. By rationally arranging the cylinder's installation position, the effective usable width of the load-bearing platform 7 is maximized even when vehicle width is limited. Calculations show that this design increases the effective usable width of the load-bearing platform 7 by 30% compared to traditional designs. This design not only improves space utilization but also enhances the product's applicability, making it particularly suitable for applications with limited vehicle width.

[0032] As can be seen from the above embodiments, this utility model solves the problem that vehicles with fully or semi-load-bearing body designs cannot install traditional hydraulic tailgates due to insufficient beam strength. By integrating the entire lifting system inside the vehicle body, the impact on appearance is eliminated, maintaining the overall aesthetics of the vehicle. Through compact design and space optimization, the effective usable width of the load-bearing platform 7 is maximized under limited vehicle width conditions. The parallelogram mechanism design ensures the stability and reliability of the load-bearing platform 7 during movement. Through precise control system design, accurate switching between vertical and horizontal states of the load-bearing platform 7 is achieved, improving operational convenience and safety.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An internally mounted lifting device, characterized in that, The system includes a base (1), a lifting arm (2), a lifting cylinder (3), a follower arm (4), a vertical arm (5), a door closing cylinder (6), and a support platform (7). The base (1) is fixed to the vehicle floor by bolts or welding. The lifting arm (2) is hinged to the base (1). One end of the lifting cylinder (3) is hinged to the base (1), and the other end is hinged to the lifting arm (2). One end of the follower arm (4) is hinged to the base (1), and the other end is hinged to the vertical arm (5). The lower end of the vertical arm (5) is hinged to the follower arm (4), and the upper end is fixedly connected to the support platform (7). One end of the door closing cylinder (6) is hinged to the vertical arm (5), and the other end is hinged to the support platform (7).

2. The built-in lifting device according to claim 1, characterized in that... The base (1) is provided with a reinforcing rib structure, which is made by stamping process, and the mounting hole of the base (1) is an elongated hole design.

3. The built-in lifting device according to claim 2, characterized in that... The number of bases (1) is two, which are symmetrically arranged on both sides of the vehicle floor.

4. The built-in lifting device according to claim 1, characterized in that... Both the lifting arm (2) and the follower arm (4) are made of high-strength alloy steel, and the length of the lifting arm (2) is equal to the length of the follower arm (4).

5. The built-in lifting device according to claim 4, characterized in that... A self-lubricating copper sleeve is provided at the connection between the follower arm (4) and the vertical arm (5), and the cross-sectional shape of the follower arm (4) is a rectangular tube.

6. The built-in lifting device according to claim 1, characterized in that... The carrying platform (7) is a rectangular frame structure with anti-slip patterned steel plates on the surface and detachable guardrails around it. The height of the guardrails is 120 mm.

7. The built-in lifting device according to claim 1, characterized in that... The cylinder body of the lifting cylinder (3) is embedded in the internal space of the lifting arm (2), and both ends of the lifting cylinder (3) are provided with spherical bearings.

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