Electric scissor lift conveyor

Abstract

The utility model discloses an electric scissor type lifting platform conveyor, including base and conveying platform, and is connected with the scissor lifting mechanism between conveying platform and base, and the scissor lifting mechanism bottom two ends are rotatively connected and slidingly connected on the base respectively, and the scissor lifting mechanism bottom movable end is connected motor drive through crank connecting rod mechanism, and the motor is equipped with the brake of being used for braking and the encoder of being used for controlling the rotation angle, and the motor is equipped with the gear of being matched on the crank connecting rod mechanism and is connected through chain drive, and the device can accurately control the lifting height and has strong adaptability.

Description

Technical Field

[0001] This utility model relates to intelligent warehousing, and in particular to an electric scissor lift conveyor. Background Technology

[0002] With the rapid development of intelligent logistics and automated warehousing technologies, Automated Guided Vehicles (AGVs) have become core equipment for the flexible transfer of materials within warehouses. In the inbound process of intelligent automated storage and retrieval systems (AS / RS), AGVs typically transport pallets carrying materials from the temporary storage area to a fixed conveyor line at the front of the AS / RS. However, in practical applications, it has been found that because the carrying surface height of the AGV is usually fixed, while the height of the conveyor at the front of the AS / RS varies depending on factors such as warehouse structure and conveyor line layout, a significant height difference generally exists between the AGV and the conveyor line. This height mismatch prevents smooth and efficient automated handover of pallets between the AGV and the conveyor line, becoming a bottleneck restricting the overall efficiency of the warehousing system.

[0003] To address the aforementioned height adaptation issue, existing technologies primarily employ lifting and conveying equipment as a transitional mechanism. Hydraulic-driven lifting platforms are a common solution. However, this approach has significant drawbacks: First, the hydraulic system relies on a hydraulic station and cylinders, making it prone to hydraulic oil leaks over time. This not only contaminates the clean storage environment but also requires frequent maintenance, resulting in high operating costs. Second, hydraulic lifting platforms typically only stop at a few preset extreme positions (such as the highest and lowest points), unable to precisely stop at any height within their travel range, exhibiting poor flexibility and difficulty in adapting to various AGV models or future process changes.

[0004] Another alternative is to use an electric actuator or lead screw to directly lift the scissor fork. While this avoids the problem of hydraulic oil leakage, this lifting method often requires a high-power motor, and the actuator or lead screw itself bears enormous axial pressure, resulting in lower efficiency, higher cost, and insufficient stability and reliability over long-term use. Furthermore, this type of solution also has limitations in terms of control precision and safety (such as power-off self-locking). Summary of the Invention

[0005] Purpose of the utility model: The purpose of this utility model is to provide an electric scissor lift conveyor that can accurately control the lifting height and has strong adaptability.

[0006] Technical solution: The electric scissor lift conveyor of this utility model includes a base and a conveying platform. A scissor lifting mechanism is connected between the conveying platform and the base. The two ends of the bottom of the scissor lifting mechanism are rotatably connected to the base and slidably connected to the base, respectively. The movable end of the bottom of the scissor lifting mechanism is connected to a motor for drive through a crank-connecting rod mechanism.

[0007] By connecting the bottom movable end of the scissor lift mechanism to a crank-connecting rod mechanism and driving it with a motor, a complete electric lifting mechanism is formed. This design eliminates the traditional hydraulic system, fundamentally eliminating the risk of hydraulic oil leakage and meeting the environmental protection requirements of cleanrooms. The crank-connecting rod mechanism can efficiently and smoothly convert the rotational motion of the motor into the linear push-pull force required by the scissor lift mechanism, resulting in high transmission efficiency and a compact structure. Simultaneously, the motor drive facilitates precise electrical control, allowing the lifting platform to accurately stop at any height within its travel range. This greatly improves the equipment's adaptability to different docking heights and solves the transfer problem caused by height mismatch between AGVs and fixed conveyor lines.

[0008] Preferably, the motor is equipped with a brake for braking and an encoder for controlling the rotation angle.

[0009] The encoder can provide real-time and accurate feedback on the motor's rotation angle or number of revolutions. This information can be converted by the control system to obtain the accurate height of the conveyor platform, thus achieving precise positioning of the lifting position. The brake activates immediately upon motor power failure or receiving a stop command, generating braking torque to lock the motor shaft and prevent the conveyor platform from accidentally falling due to its own weight or load. This provides crucial safety assurance and avoids potential risks of personal injury and equipment damage.

[0010] Preferably, the motor and the crank-connecting rod mechanism are equipped with matching gears and are connected by chain drive.

[0011] The motor is connected to the crank-connecting rod mechanism via chain and gear transmission, which makes the motor placement more flexible. This is especially useful when there are scissor lift mechanisms and other components that may encroach on each other's space. Flexible motor placement allows for better layout of all components.

[0012] Preferably, a limiting chain is connected between the base and the conveying platform to limit the maximum height of the conveying platform.

[0013] A limiting chain is installed between the base and the conveyor platform as an important mechanical safety redundancy protection. Even if the photoelectric detection system or electrical control system malfunctions, causing the platform to rise beyond its travel range, the limiting chain will be straightened and subjected to tension at the preset maximum safe height, thus mechanically preventing the platform from rising further. This effectively prevents serious accidents such as structural deformation, component damage, or even overall overturning that may be caused by the overextension of the scissor lift mechanism, greatly improving the inherent safety level of the equipment.

[0014] Preferably, the bottom of the lifting lower base is provided with a horizontal adjustment screw.

[0015] A leveling screw is installed at the bottom of the lifting base, which solves the problem of leveling the equipment during on-site installation.

[0016] Preferably, an oil-free bushing is installed in the hinge hole of the lifting scissor fork.

[0017] Installing an oil-free bushing inside the hinge hole of the lifting scissor fork effectively reduces frictional resistance and wear at the hinge point, making the scissor fork rotate more flexibly and smoothly during lifting and lowering, with lower operating noise; moreover, the oil-free bushing has self-lubricating properties, eliminating the need for additional lubricating oil, achieving maintenance-free or low-maintenance operation, and avoiding oil pollution of the storage environment.

[0018] Beneficial effects: By adopting a core solution that combines motor drive with a crank-connecting rod mechanism to propel the scissor lift mechanism, the risk of hydraulic oil leakage is completely eliminated, making it cleaner and more environmentally friendly. Moreover, this electromechanical drive structure can achieve stepless precise positioning and control of the lifting height within the stroke range through the motor, allowing the equipment to flexibly adapt to different docking height requirements and solving the key problem of height mismatch between AGVs and fixed conveyor lines. At the same time, the combined transmission method of crank-connecting rod and scissor mechanism is highly efficient and runs smoothly, together forming a lifting and conveying solution that is precise in control, highly adaptable, and free from oil pollution. Attached Figure Description

[0019] Figure 1 This is a front view of the present invention; Figure 2 This is the left view of the present invention; Figure 3 This is a rear view of the present invention; Figure 4 for Figure 1 Sectional view along the middle AA; Figure 5 This is a three-dimensional structural diagram of the present invention. Detailed Implementation

[0020] As shown in the figure, the electric scissor lift conveyor of this utility model includes a base 1 and a conveying platform 2. A scissor lifting mechanism 3 is connected between the conveying platform 2 and the base 1. The two ends of the bottom of the scissor lifting mechanism 3 are rotatably connected to the base 1 and slidably connected to the base 1, respectively. The movable end of the bottom of the scissor lifting mechanism 3 is connected to a motor for driving through a crank-connecting rod mechanism 4.

[0021] The bottom of the base 1 is provided with a horizontal adjustment screw to adjust the level of the base 1, and the base 1 is provided with a sliding groove that matches the movable end of the bottom of the scissor lift mechanism 3.

[0022] The conveying platform 2 is an electric roller conveyor. The front and rear ends of the conveying platform 2 are equipped with photoelectric sensors for cargo detection. The photoelectric sensors may or may not be installed. The scissor lift mechanism 3 is hinged to the bottom of the conveying platform 2.

[0023] The scissor lift mechanism 3 includes two scissor lifts located on the left and right sides of the base 1. Each scissor lift has two movable rods. The bottom of one movable rod is rotatably connected to the base 1 via a pin or other device, and the bottom of the other movable rod is slidably connected to a groove in the base 1. An oil-free bushing is installed in the hinge hole at the intersection of the two movable rods.

[0024] Each side of the scissor lift mechanism 3 has a crank-connecting rod mechanism 4 at its movable end. The connecting rod of the crank-connecting rod mechanism 4 is hinged to the movable end via a connecting shaft, and both movable ends share a common connecting shaft. The movable end is equivalent to a slider that can move horizontally within a groove. The crank of the crank-connecting rod mechanism 4 is connected to a motor drive, and the motor drives the crank to rotate, thereby causing the movable end at the bottom of the scissor lift mechanism 3 to move horizontally, thus raising and lowering the conveyor platform 2. In this embodiment, the cranks of the crank-connecting rod mechanisms 4 on both sides are fixed to both ends of a rotating shaft 9. The rotating shaft 9 is rotatably connected to the base 1, and a gear is provided on the rotating shaft 9. A motor 5 is provided on the base 1, and a gear is provided on the output shaft of the motor 5. The output shaft and the gear on the rotating shaft 9 are connected by a chain drive. The motor 5 is equipped with a brake for braking and an encoder for controlling the rotation angle.

[0025] A photoelectric system 6 for detecting whether the conveyor platform has reached the bottom and top can also be installed on the rear side of the entire device. The photoelectric system 6 includes two sensors 6 and a sensing plate 7. The entire photoelectric system 6 is located on the rear side of the device. The two sensors 6 are fixed to the rear side of the base 1 by a connecting plate, and the two sensors 6 are arranged vertically, corresponding to the highest and lowest positions of the conveyor platform, respectively. The sensing plate 7 is L-shaped. The long plate is fixed to the rear side of the conveyor platform 2 and is vertically set. The short plate is aligned with the sensor 6 when the conveyor platform 2 moves to the highest and lowest positions, thereby completing the position detection of the conveyor platform 2.

[0026] A limiting chain can also be installed on the front side of the entire device, with its two ends connected to the front sides of the base 1 and the conveyor platform 2, respectively. The limiting chain is not fully shown in the attached drawings; only a portion is shown.

Claims

1. An electric scissor lift conveyor, comprising a base (1) and a conveying platform (2), wherein a scissor lifting mechanism (3) is connected between the conveying platform (2) and the base (1), characterized in that: The bottom ends of the scissor lift mechanism (3) are rotatably connected to the base (1) and slidably connected to the base (1) respectively. The movable end of the bottom of the scissor lift mechanism (3) is connected to the motor (5) for drive through the crank connecting rod mechanism (4).

2. The electric scissor lift conveyor according to claim 1, characterized in that: The motor (5) is equipped with a brake for braking and an encoder for controlling the rotation angle.

3. The electric scissor lift conveyor according to claim 1, characterized in that: The motor (5) and the crank-connecting rod mechanism (4) are equipped with matching gears and are connected by chain drive.

4. The electric scissor lift conveyor according to claim 1, characterized in that: It also includes a photoelectric system (6) for detecting whether the conveyor platform has reached the bottom and top.

5. The electric scissor lift conveyor according to claim 4, characterized in that: The photoelectric system (6) includes two sensors (7) and a matching sensor plate (8). The two sensors (7) are fixed to the base (1) by a connecting plate, and the sensor plate (8) is fixed to the conveying platform (2).

6. The electric scissor lift conveyor according to claim 1, characterized in that: A limiting chain is connected between the base (1) and the conveying platform (2) to limit the maximum height of the conveying platform (2).

7. The electric scissor lift conveyor according to claim 1, characterized in that: The conveying platform (2) is an electric roller conveyor, and the front and rear ends of the conveying platform (2) are equipped with photoelectric sensors for cargo detection.

8. The electric scissor lift conveyor according to claim 1, characterized in that: The bottom of the lifting base (1) is provided with a horizontal adjustment screw.

9. The electric scissor lift conveyor according to claim 1, characterized in that: An oil-free bushing is installed in the hinge hole of the scissor lift mechanism (3).

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