Scissor fork type aerial work platform limiting and stabilizing device

Abstract

The invention discloses a limiting and stabilizing device for a scissor type aerial work platform. The limiting and stabilizing device comprises a guide piece fixed to the bottom of the platform. The sliding pieces are fixedly arranged at the tops of front and rear arm frames of the shear fork arms; the sliding piece and the guide piece form a sliding pair, and the displacement of the platform in the axis direction of the arm support is restrained in the lifting process of the platform, so that the gaps between the two end parts of the arm support and adjacent parts are kept constant; the displacement of the platform along the axis direction of the cantilever crane of the shear fork arm is effectively restrained through a precise sliding pair formed by the platform bottom guide piece and the cantilever crane top sliding piece, the problem of unstable weighing clearance caused by platform movement of a traditional structure is fundamentally solved, the operation stability of the platform in the lifting process is ensured, and the weighing precision of the platform is improved. And the measurement precision of the weighing pin shaft is obviously improved, and the safe and reliable operation of the aerial work platform is guaranteed in an all-around manner.

Description

Technical Field

[0001] The invention relates to an aerial work platform, in particular to a scissor-type aerial work platform limiting and stabilizing device. Background Art

[0002] Measuring load weight on scissor-type aerial work platforms is crucial for ensuring operational safety and stable operation. Sensor-based measurement methods have become the mainstream solution due to their high accuracy and easy calibration. The widely used NYS-GZX1 series load cells utilize a four-corner pin mounting structure for load detection. Their core principle is to utilize a strain gauge load cell embedded in the weighing pin to sense the pin's deformation under load. The output signal is generated via a Wheatstone bridge circuit and converted to a linear current signal via an external amplifier. This sensor requires that the boom and adjacent components, such as the movable or fixed blocks, remain in a non-contact state at all times, and that the spacing must meet strict, high-precision standards. However, existing platforms using these sensors commonly suffer from a technical flaw that results in uncontrolled axial displacement between the pin and boom, leading to variable spacing between the boom and adjacent components. This structural flaw not only significantly reduces the accuracy of weighing data but can also cause mechanical damage to the sensor due to abnormal friction over long periods of operation. Although some platforms have adopted alternative weighing systems, converting existing equipment to other systems requires re-matching installation conditions, which results in long modification cycles and high costs. Equipment that continues to use existing sensors is unable to meet high-precision weighing requirements due to spacing fluctuations, creating a dual dilemma of safety monitoring and equipment upgrades. Summary of the Invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a scissor-type aerial work platform limiting and stabilizing device that suppresses the axial displacement of the work platform through mechanical limiting and simultaneously improves the weighing accuracy and operation stability.

[0004] Technical solution: The scissor-type aerial work platform limit stabilization device described in the present invention includes a guide member fixed to the bottom of the platform; a sliding member fixedly arranged on the top of the front and rear booms of the scissor arms; the sliding member and the guide member form a sliding pair, which constrains the displacement of the platform along the axis of the boom during the platform lifting process to maintain a constant gap between the two ends of the boom and adjacent components.

[0005] Preferably, the scissor-type aerial work platform includes a platform, a scissor arm and its arm support, a weighing pin shaft and a limit stabilization device. Slide grooves are provided on both sides of the bottom of the platform. The two ends of the weighing pin shaft are respectively connected to the arm support and the movable block or fixed block in the slide groove. The arm support is sleeved on the outside of the weighing pin shaft. A strain gauge weighing sensor is provided in the gap position between the arm support and the movable block or fixed block in the weighing pin shaft.

[0006] Preferably, the guide member is a slide rail extending along the center line of the platform, and its cross section forms a U-shaped guide channel.

[0007] Preferably, the sliding member is a sliding block that matches the cross section of the U-shaped guide channel, and its side wall is clearance-fitted with the inner wall of the guide channel.

[0008] Preferably, the sliding member is fixed to the top bearing surface at the axial center position of the arm through a bolt group.

[0009] Preferably, the guide member is welded to the central axis of the bottom of the platform corresponding to the sliding member.

[0010] Preferably, the surface of the sliding part is provided with a wear-resistant and corrosion-resistant coating.

[0011] Preferably, the inner surface of the guide member is provided with a self-lubricating coating.

[0012] Preferably, a rubber buffer layer is provided between the sliding member and the top bearing surface of the arm to reduce vibration and noise during the lifting and lowering of the platform.

[0013] Preferably, the surfaces of the guide member and the sliding member are provided with reflective markings to facilitate identification and inspection in low-light environments.

[0014] Preferably, an anti-static device is provided between the guide member and the sliding member to prevent damage to the equipment and operators caused by static electricity accumulation.

[0015] Beneficial effects: Compared with the existing technology, the present invention has the following significant advantages: the precision sliding pair composed of the guide part at the bottom of the platform and the sliding part at the top of the arm effectively constrains the displacement of the platform along the axis of the scissor arm arm, fundamentally solving the problem of unstable weighing gap caused by platform movement in the traditional structure, not only ensuring the smooth operation of the platform during lifting and lowering, but also significantly improving the measurement accuracy of the weighing pin shaft, providing all-round protection for the safe and reliable operation of the aerial work platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the installation of the position limiting stabilization device in the present invention.

[0017] Figure 2 This is a schematic diagram of the installation of the sliding member of the position limiting stabilization device in the present invention.

[0018] Figure 3 This is an enlarged schematic diagram of the installation of the sliding member in the present invention.

[0019] Figure 4 This is a schematic diagram of the installation of the guide member of the position limiting stabilization device in the present invention.

[0020] Figure 5This is an enlarged schematic diagram of the guide member installation in the present invention.

[0021] Figure 6 This is a schematic diagram of the structure in which the arm support and adjacent components are connected via weighing pins in the present invention. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0023] like Figures 1 to 6 As shown, a scissor-type aerial work platform limit stabilization device in this embodiment mainly consists of a guide member 1 and a slider 2. The guide member 1 is a slide rail extending along the centerline of the bottom of the platform 4. Its cross-section is U-shaped, forming a continuous guide channel and is firmly fixed to the bottom of the platform 4 by welding. The sliders 2 are symmetrically arranged in groups. Their cross-sectional shape matches the U-shaped guide channel, and the side walls maintain a clearance fit with the inner wall of the channel. These sliders 2 are fixedly installed at the axial center position of the top of the front and rear arm frames 3 of the scissor arm by a bolt group to ensure alignment with the guide member. A rubber buffer layer is provided between the slider 2 and the top bearing surface of the arm frame 3 to absorb vibration and reduce noise. The outer surface of the slider 2 is covered with a wear-resistant and corrosion-resistant coating, while the inner surface of the U-shaped channel of the guide member 1 is coated with a self-lubricating coating to enhance durability and smooth movement. Reflective markings can be added to the surfaces of the guide member 1 and the slider 2 for easy identification in low-light environments, and an anti-static device can be provided between the two to eliminate the hazards of static electricity.

[0024] The core principle of the NYS-GZX1 series load cells lies in their built-in strain gauge sensor. Integrated within the weighing pin, this sensor senses the pin's microscopic deformation, or strain, under load. Using a Wheatstone bridge circuit, it converts this deformation into a weak electrical signal, which is then processed by an external amplifier into a standard linear current output. A key prerequisite for achieving high-precision load detection is that the ends of the arm 3, on which the weighing pin is mounted, and the adjacent moving or fixed blocks must maintain a constant, non-contact gap. Any changes in this gap directly affect the pin's load state, introducing measurement errors and compromising the sensor's accuracy.

[0025] In the scissor-type aerial work platform involved in this solution, slides are provided on both sides of the bottom of the platform 4. The two arms 3 of the scissor arms are connected to the slides via weighing pins: the two ends of one arm 3 are connected to the fixed block in the slide via weighing pins and are fixedly connected to the slide, while the two ends of the other arm 3 are connected to the moving block in the slide via weighing pins and can slide in the slide. Figure 6As shown, the moving block and arm 3 are mounted on the outside of the weighing pin. The weighing pin and moving block are bolted or welded together to form a single unit. They are circumferentially fixed to the arm 3 and can move relative to each other axially. When the scissor arms fold or unfold to raise or lower the platform 4, the arm 3 connected to the moving block moves horizontally along the bottom of the platform 4. This movement introduces two potential risks: First, inconsistent clearances between the ends of the arm 3. If the platform 4 shifts or deflects axially relative to the arm 3 during the lifting process, this can cause the clearances between the moving block or fixed block connecting the two ends of the same arm 3 and the ends of the arm 3 to change, or even increase the clearance at one end and decrease the clearance at the other. Second, axial displacement of the platform 4: The platform 4 itself may also experience unexpected horizontal displacement along the axis of the arm 3. Any of these situations will disrupt the constant clearance required for the weighing pin to operate, causing the pin to be subjected to abnormal or asymmetric additional forces or bending moments, ultimately distorting the measurement results of the built-in strain gauge load cell.

[0026] To address this issue, this limited stabilization device features a slide 2 fixed to the top of the axial center of each arm 3 that requires restraint. Simultaneously, a guide 1, typically a U-shaped rail, is fixed to the bottom of the platform 4, along the central axis corresponding to the slide 2. The slide 2 forms a precise sliding pair with the U-shaped channel of the guide 1.

[0027] Its working mechanism is as follows: in the process of the scissor arm driving the platform 4 to rise and fall, the sliding member 2 fixed on the top of the arm 3 is forced to slide along the U-shaped guide member 1 fixed on the bottom of the platform. The purpose of this setting is to strictly limit any horizontal displacement of the platform 4 relative to the arm 3 along the axis of the arm 3. By eliminating this axial displacement, it is ensured that the positional relationship between the two ends of the arm 3, especially the part connected to the weighing pin, relative to its adjacent moving block or fixed block remains stable. The direct effect is that the gap between the two ends of the arm 3 and the moving block or fixed block is forced to remain constant, always meeting the installation gap requirements of high-precision weighing sensors. This rigid constraint effectively avoids abnormal stress on the weighing pin caused by the horizontal deflection of the platform 4, such as additional bending moment or shear force, and fundamentally guarantees the accuracy and reliability of the measurement data of the built-in strain gauge weighing sensor. In addition, the rubber buffer layer between the sliding part 2 and the top bearing surface of the arm 3 effectively absorbs the impact vibration during the lifting process and reduces the noise; and the wear-resistant and corrosion-resistant coating on the surface of the sliding part 2 and the self-lubricating coating on the inner surface of the guide part 1 work together to significantly reduce the friction resistance and wear of the sliding pair, ensuring the smoothness and durability of long-term operation.

[0028] During use, when the scissor arm is raised or lowered, the sliding member 2 slides smoothly in the U-shaped channel of the guide member 1, automatically correcting the horizontal position of the platform 4. The operator can quickly check the alignment status of the sliding pair through the reflective markings, and the anti-static device continuously removes the static charge generated by friction. The device does not require additional operational intervention and maintains the stability of the platform 4 in real time through mechanical constraints, ensuring that the weighing pin is evenly stressed and the connection gap of the arm 3 is constant, thereby ensuring the safety of aerial work and the reliability of weighing. At the same time, for aerial work platforms of this type that use a four-point weighing system and have been put into use on the market, it is only necessary to fix this device on the bottom of the platform 4 and the arm 3 to solve the problem of low measurement accuracy, with a short modification cycle and low cost.

Claims

1. A scissor-type aerial work platform limit stabilization device, characterized by: The invention comprises a guide member (1) fixed to the bottom of a platform (4); a sliding member (2) fixedly arranged on the top of the front and rear arm frames (3) of the scissor arms; the sliding member (2) and the guide member (1) form a sliding pair, which constrains the displacement of the platform (4) along the axis direction of the arm frame (3) during the platform lifting process.

2. The position limiting stabilization device according to claim 1, characterized in that: The guide member (1) is a slide rail extending along the center line of the working platform (4), and its cross section forms a U-shaped guide channel.

3. The position limiting stabilization device according to claim 2, characterized in that: The sliding member (2) is a sliding block that matches the cross section of the U-shaped guide channel, and its side wall is clearance-matched with the inner wall of the guide channel.

4. The position limiting stabilization device according to claim 1, characterized in that: The sliding member (2) is fixed to the top bearing surface at the axial center position of the front and rear arm frames (3) by means of a bolt group.

5. The position limiting stabilization device according to claim 4, characterized in that: The guide member (1) is welded to the bottom of the platform (4) on a central axis corresponding to the sliding member (2).

6. The position limiting stabilization device according to claim 1, characterized in that: The surface of the sliding member (2) is provided with a wear-resistant and corrosion-resistant coating.

7. The position limiting stabilization device according to claim 1, characterized in that: The inner surface of the guide member (1) is provided with a self-lubricating coating.

8. The position limiting stabilization device according to claim 1, characterized in that: A rubber buffer layer is also provided between the sliding member (2) and the top bearing surface of the arm (3) to reduce vibration and noise during the platform lifting process.

9. The position limiting stabilization device according to claim 1, characterized in that: The surfaces of the guide member (1) and the sliding member (2) are provided with reflective markings to facilitate identification and inspection in an environment with insufficient light.

10. The position limiting stabilization device according to claim 1, characterized in that: An anti-static device is provided between the guide member (1) and the sliding member (2) to prevent static electricity accumulation from causing harm to equipment and operators.

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