An aerial work platform

Abstract

The application discloses a high-altitude operation device, which comprises a chassis, a lifting mechanism, an operation platform, a connecting frame and a plurality of weighing structures. The top end of the lifting mechanism is movably connected with the connecting frame, and the plurality of weighing structures are arranged between the connecting frame and the operation platform. The upper end of the weighing structure is connected with the bottom plate of the operation platform in a positioning locking mode to eliminate relative displacement, and the lower end of the weighing structure is connected with the top plate of the connecting frame in a flexible mode to realize axial limiting, radial limiting and vibration absorption. The load of the operation platform is transmitted to the connecting frame in a single vertical direction via the weighing structure, and the connecting frame isolates the amplitude motion of the lifting mechanism, so that the weighing structure only bears static vertical load. The application reconstructs the force transmission path and separates the motion and bearing functions, and thus solves the problems of low precision, complex control and high cost of the traditional weighing scheme from the root, reduces the weighing error rate and is suitable for various scissor-type high-altitude operation platforms.

Description

Technical Field

[0001] This invention relates to the field of aerial work equipment technology, and more particularly to an aerial work device. Background Technology

[0002] Scissor lifts are widely used in high-altitude operations such as construction, equipment installation, and municipal maintenance due to their advantages of smooth lifting, high load-bearing capacity, and large working range. To prevent accidents such as overloading causing the entire machine to tip over or structural components to break, a weighing system has become an essential safety device for scissor lifts.

[0003] Currently, the commonly used weighing solution in the industry is to directly use the weighing pin as the connection between the working platform and the scissor lift boom. This solution has the following inherent drawbacks: It requires extremely high precision in the machining and assembly of peripheral components such as the weighing pin, platform slide rails, and boom sliders, significantly increasing production costs. The control logic is complex: During boom luffing, the weighing pin will shift within the slide rail, causing real-time changes in the load distribution between the fixed and movable ends. The control system needs to continuously collect and dynamically process multiple load signals, resulting in cumbersome software logic, high computational load, and high debugging difficulty. The weighing accuracy is low and stability is poor: During operation, the weighing pin is susceptible to interference from various factors such as boom luffing impact, environmental vibration, and assembly gaps, and the error rate gradually increases with usage time and component wear, posing safety hazards. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings of the prior art and provide a high-altitude work device that fundamentally solves the problems of low accuracy, complex control, and high cost of traditional weighing schemes by reconstructing the force transmission path and separating motion and load-bearing functions.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: A high-altitude work platform is provided, comprising a chassis, a lifting mechanism, a work platform, a connecting frame, and multiple sets of weighing structures. The bottom end of the lifting mechanism is movably connected to the chassis, and the top end is movably connected to the connecting frame. The upper end of each weighing structure forms a positioning and locking connection with the bottom plate of the work platform to eliminate relative displacement, and the lower end forms a flexible connection with the top plate of the connecting frame to achieve radial limiting and vibration absorption. The load of the work platform is vertically transmitted to the connecting frame through the multiple sets of weighing structures; the connecting frame is disposed between the lifting mechanism and the weighing structures, enabling the weighing structures to measure static vertical loads and blocking interference caused by the luffing motion of the lifting mechanism.

[0006] In some embodiments, the weighing structure consists of two sets, symmetrically arranged along the width direction of the connecting frame; each set of weighing structures includes two weighing pins spaced apart along the length direction of the connecting frame.

[0007] In some embodiments, each weighing pin includes a load-bearing support portion, a first connecting portion integrally connected to the top surface of the load-bearing support portion, and a second connecting portion integrally connected to the bottom surface of the load-bearing support portion, wherein the diameters of the first connecting portion and the second connecting portion are both smaller than the diameter of the load-bearing support portion; The top surface of the load-bearing support unit abuts against the bottom plate of the work platform, and the bottom surface abuts against the top plate of the connecting frame; The first connecting part is locked to the bottom plate of the work platform by the first locking part to achieve axial limiting and circumferential positioning of the upper part of the symmetrical weight structure; The second connecting part and the top plate of the connecting frame are locked together by a flexible connector and a second locking component to achieve bidirectional axial limiting of the lower part of the symmetrical weight-bearing structure.

[0008] In some embodiments, the first connecting portion includes a connecting post and a limiting block integrally formed on the outer peripheral wall of the connecting post; The base plate of the work platform has a first through hole adapted to the connecting column and a slot adapted to the limiting block and connected to the first through hole. The limiting block is inserted into the slot to achieve circumferential positioning of the weighing pin. The upper outer peripheral wall of the connecting column extending out of the first through hole is provided with an external thread. The axial locking of the weighing pin is achieved by screwing a lock nut into the external thread. The lock nut forms the first locking element.

[0009] In some embodiments, the second connecting part is a cylindrical columnar structure, and the top plate of the connecting frame is provided with a second through hole; The second connecting part passes through the second through hole from top to bottom, and an elastic damping bushing is fitted on the shaft section that extends out of the lower surface of the top plate of the connecting frame. The outer diameter of the elastic damping bushing is larger than the diameter of the second through hole. The second connecting part extends out of the lower end of the elastic damping bushing and has an external thread on its outer peripheral wall. By screwing the locking nut into the external thread, the elastic damping bushing is pressed against the lower surface of the top plate of the connecting frame, thereby achieving axial fixation between the second connecting part and the connecting frame. The elastic damping bushing is formed as a flexible connecting part, and the locking nut is formed as a second locking part.

[0010] In some embodiments, the lifting mechanism is a scissor lift. The top of the chassis has a first groove extending along its length and arranged opposite each other along its width. The fixed hinged end of the scissor lift is hinged to the chassis, and the movable end has a first connecting shaft. First sliders are coaxially mounted at both ends of the first connecting shaft, and each slider is embedded in a corresponding first groove on its respective side and can slide back and forth along its length. The connecting frame has a second groove extending along its length and arranged opposite each other along its width. The fixed hinged end of the top of the scissor lift is hinged to the connecting frame, and the movable end is hinged to a second connecting shaft. Second sliders are coaxially mounted at both ends of the second connecting shaft, and each slider is embedded in a corresponding second groove on its respective side and can slide back and forth along its length.

[0011] In some embodiments, along the width direction of the connecting frame, the second connecting portion and the second slider are arranged side by side with a gap between them.

[0012] Compared with existing technologies, this invention has the following significant advantages: By adding a connecting frame between the lifting mechanism and the working platform, this invention completely separates motion transmission from load measurement, fundamentally solving the problem of the impact of boom amplitude variation on weighing accuracy in traditional weighing schemes. The first locking component at the upper end of the weighing pin eliminates displacement errors caused by assembly gaps and load impacts, while the elastic damping bushing at the lower end achieves both axial anti-disengagement and radial limiting, and absorbs environmental vibration interference, making the weighing results more accurate and stable. Simultaneously, this device reduces the machining accuracy requirements for peripheral components such as the slide and slider, simplifies the assembly process, and effectively controls production costs. The control logic is also greatly simplified; the controller does not need to process complex dynamic load distribution signals, only basic processing of static load signals is required, reducing the difficulty of software development and debugging. Furthermore, the double axial limiting structure at both ends of the weighing pin further enhances the safety and reliability of equipment operation. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0014] Figure 1 A schematic diagram of the structure of an aerial work platform provided in an embodiment of this application; Figure 2 A schematic diagram of the lifting mechanism provided for an embodiment of this application; Figure 3 Exploded views of the lifting mechanism, connecting frame, and work platform provided for embodiments of this application; Figure 4 Exploded views of the work platform, connecting frame, and multiple sets of weighing structures provided for embodiments of this application; Figure 5 for Figure 1 Enlarged view of point A in the middle; Figure 6 An exploded view of a weighing pin provided for an embodiment of this application.

[0015] The attached figures are labeled as follows: 1-Chassis; 11-First groove 2-Lifting mechanism; 21-First connecting shaft; 22-First slider; 23-Second connecting shaft; 24-Second slider 3-Working platform; 31-First through hole; 32-Slot 4-Connecting bracket; 41-Second through hole; 42-Second slide groove 5-Weighing structure; 51-Bearing support part; 52-First connecting part; 521-Connecting column; 522-Limiting block; 53-Second connecting part; 54-First locking element; 55-Flexible connecting element; 56-Second locking element. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0017] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 5 , Figure 1 A schematic diagram of the structure of an aerial work platform provided in an embodiment of this application; Figure 2 A schematic diagram of the lifting mechanism 2 provided in an embodiment of this application; Figure 3 Exploded views of the lifting mechanism 2, connecting frame 4, and working platform 3 provided for embodiments of this application. Figure 4 Exploded view of the work platform, connecting frame 4 and multiple sets of weighing structures 5 provided for embodiments of this application; Figure 5 for Figure 1 Enlarged view at point A. The device includes a chassis 1, a lifting mechanism 2, a working platform 3, a connecting frame 4, and multiple sets of weighing structures 5.

[0018] The chassis 1 provides basic support for the entire device, and is equipped with wheels and retractable outriggers at the bottom to meet the needs of both mobile and stationary operation. For example, chassis 1 is a scissor lift chassis.

[0019] The bottom end of the lifting mechanism 2 is movably connected to the chassis 1, and the top end is movably connected to the connecting frame 4, enabling the connecting frame 4 to smoothly rise and fall in the vertical direction. Specifically, the lifting mechanism 2 can adopt a scissor boom, composed of multiple sets of cross-hinged steel booms, which are driven by hydraulic cylinders to achieve telescopic and luffing (scissor booms are mature existing technology and will not be described in detail here). The top of the chassis 1 is machined with two first slide grooves 11 that extend along its length direction and are arranged opposite each other along its width direction. The fixed hinged end of the bottom of the scissor boom is hinged to the chassis 1 by a pin, and the movable end is hinged to a first connecting shaft 21. The two ends of the first connecting shaft 21 are coaxially fixedly installed with first sliders 22. The two first sliders 22 are respectively embedded in the first slide grooves 11 on the corresponding sides and can slide back and forth along the length direction of the first slide grooves 11.

[0020] The bottom surface of the connecting frame 4 is machined with two second sliding grooves 42 extending along its length and arranged opposite each other along its width. The fixed hinged end of the top of the scissor boom is hinged to the connecting frame 4 via a pin, and the movable end is hinged to a second connecting shaft 23. Two second sliders 24 are coaxially fixedly installed at both ends of the second connecting shaft 23. The two second sliders 24 are respectively embedded in the corresponding second sliding grooves 42 and can slide back and forth along the length of the second sliding grooves 42. Along the width direction of the connecting frame 4, the second connecting part 53 and the second sliders 24 are arranged side by side with sufficient clearance between them to ensure that the second sliders 24 do not collide with the second connecting part 53 when sliding within the second sliding grooves 42 during the full stroke luffing of the scissor boom, thus ensuring the safety of equipment operation.

[0021] The connecting frame 4 serves as an intermediate transition component, positioned between the lifting mechanism 2 and the working platform 3. Multiple sets of weighing structures 5 are evenly distributed between the top surface of the connecting frame 4 and the bottom surface of the working platform 3. The upper end of each set of weighing structures 5 forms a positioning and locking connection with the bottom plate of the working platform 3, completely eliminating the relative displacement between the two; the lower end forms a flexible connection with the top plate of the connecting frame 4, simultaneously achieving radial limiting and vibration absorption functions.

[0022] The load of the working platform 3 is vertically transmitted to the connecting frame 4 through multiple sets of weighing structures 5. The connecting frame 4 completely isolates the amplitude change motion of the lifting mechanism 2 from the weighing structure 5, so that the weighing structure 5 always only measures the static vertical load and is not disturbed by the movement of the lifting mechanism 2.

[0023] Please see Figures 1 to 6 , Figure 6 The exploded view of the weighing pins provided in the embodiments of this application shows that the weighing structure 5 is configured as two sets, symmetrically arranged along the width direction of the connecting frame 4, and each set of weighing structure 5 includes two weighing pins spaced apart along the length direction of the connecting frame 4.

[0024] Specifically, the connecting frame 4 can be rectangular, such as a rectangle or a square. The four weighing pins are distributed in a rectangular pattern at the four corners of the top surface of the connecting frame 4. This arrangement can evenly distribute the load of the working platform 3 to each weighing pin, avoiding measurement deviations caused by excessive local loads.

[0025] Each weighing pin is a one-piece metal structural component, including a central load-bearing support 51, a first connecting part 52 integrally connected to the top surface of the load-bearing support 51, and a second connecting part 53 integrally connected to the bottom surface of the load-bearing support 51. The diameters of both the first connecting part 52 and the second connecting part 53 are smaller than the diameter of the load-bearing support 51. The top surface of the load-bearing support 51 abuts against the lower surface of the base plate of the working platform 3, and the bottom surface abuts against the upper surface of the top plate of the connecting frame 4. All loads on the working platform 3 are transmitted downwards through the load-bearing support 51. This design ensures the uniqueness of the force transmission path and avoids errors caused by other components participating in load transmission. The one-piece structure improves the overall strength of the weighing pin and avoids stress concentration and loosening problems caused by separate connections.

[0026] The first connecting part 52 is locked to the bottom plate of the working platform 3 by the first locking member 54, thereby achieving axial limiting and circumferential positioning of the upper part of the symmetrical weight-bearing structure 5. Specifically, the first connecting part 52 includes a connecting post 521 and a limiting block 522 integrally formed on the outer peripheral wall of the connecting post 521. The bottom plate of the working platform 3 has a first through hole 31 that matches the diameter of the connecting post 521, and a slot 32 that matches the shape of the limiting block 522 and communicates with the first through hole 31.

[0027] During assembly, the connecting column 521 passes through the first through hole 31 from the bottom of the work platform 3, while the limiting block 522 precisely engages in the slot 32, effectively preventing the weighing pin from rotating around its own axis and ensuring a fixed angle between the weighing pin and the work platform 3. The upper outer peripheral wall of the connecting column 521 extending from the first through hole 31 is machined with external threads. After passing through the first through hole 31, it is locked by tightening a locking nut. The lower surface of the locking nut is tightly fitted to the upper surface of the work platform 3's bottom plate, preventing the weighing pin from moving up and down under load impact. This locking nut forms the first locking element 54. This positioning and locking structure eliminates system errors in both assembly and use, avoiding inaccurate weighing caused by weighing pin displacement.

[0028] The second connecting part 53 is a cylindrical columnar structure, which is locked to the top plate of the connecting frame 4 by a flexible connector 55 and a second locking member 56, achieving bidirectional axial limiting of the lower part of the balancing structure 5. A second through hole 41, matching the diameter of the second connecting part 53, is provided on the top plate of the connecting frame 4. The second connecting part 53 passes through the second through hole 41 from top to bottom of the top plate of the connecting frame 4. An elastic damping bushing is fitted on the axial section extending from the lower surface of the top plate of the connecting frame 4. The outer diameter of the elastic damping bushing is larger than the diameter of the second through hole 41, allowing its top surface to tightly abut against the lower surface of the top plate of the connecting frame 4. External threads are machined on the outer peripheral wall of the lower end of the second connecting part 53 extending from the elastic damping bushing. By screwing a locking nut into the external threads, the elastic damping bushing is pressed tightly against the lower surface of the top plate of the connecting frame 4, achieving axial fixation between the second connecting part 53 and the connecting frame 4. The elastic damping bushing is formed as a flexible connector 55, and the locking nut is formed as a second locking member 56.

[0029] This bidirectional axial limiting structure completely prevents axial movement of the weighing pin: the elastic damping bushing engages with the lower end face of the second through hole 41, preventing the second connecting part 53 from dislodging upwards; the second locking member 56 presses against the elastic damping bushing, preventing the second connecting part 53 from dislodging downwards. Even under severe vibration or sudden load changes, the weighing pin remains stable, further improving weighing accuracy and structural reliability. Simultaneously, the elastic damping bushing absorbs high-frequency interference from equipment vibration and ground bumps at the work site, preventing these vibrations from being transmitted to the weighing pin and affecting the stability of the measurement results.

[0030] The working principle of the device provided in the embodiments of this application is as follows: When a load is placed on the work platform 3 or there are workers, the gravity of the load is evenly transmitted to the bearing support parts 51 of the four weighing pins through the bottom plate of the work platform 3. Since the weighing pins are fixed to the work platform 3 by the first locking member 54, there is no relative displacement between the two. The load is entirely applied vertically to the bearing support parts 51, and then transmitted from the bearing support parts 51 to the connecting frame 4, and finally transmitted to the chassis 1 through the lifting mechanism 2. When the lifting mechanism 2 performs luffing motion, the movable end of the scissor boom slides in the first slide groove 11 and the second slide groove 42 respectively through the first slider 22 and the second slider 24, driving the connecting frame 4 to rise and fall. Since there is no direct connection between the work platform 3 and the lifting mechanism 2, all luffing motion of the lifting mechanism 2 is borne independently by the connecting frame 4 and is not transmitted to the work platform 3 and the weighing structure 5. Therefore, the weighing structure 5 only bears a static vertical load throughout the entire lifting process and is not affected by the load distribution changes caused by the boom luffing in the traditional solution. The resistance strain gauge load cell integrated inside the weighing pin converts the vertical load on the support 51 into an electrical signal, which is then transmitted to the controller for processing to obtain the actual load data of the work platform 3. When the actual load exceeds the rated value, the controller will issue an audible and visual alarm and limit the upward movement of the lifting mechanism to prevent overload from causing safety accidents (the working principle of the weighing pin is a mature existing technology and will not be described in detail here).

[0031] The embodiments of this application completely separate motion transmission from load measurement by adding a connecting frame 4 between the lifting mechanism 2 and the working platform 3, fundamentally solving the problem of the impact of boom amplitude variation on weighing accuracy in traditional weighing schemes. The first locking member 54 at the upper end of the weighing pin eliminates displacement errors caused by assembly gaps and load impacts, while the bidirectional axial limiting structure formed by the flexible connecting member 55 and the second locking member 56 at the lower end completely eliminates axial movement of the weighing pin. At the same time, the elastic damping bushing can effectively absorb environmental vibration interference, making the weighing results more accurate and stable. Furthermore, the device provided by the embodiments of this application reduces the machining accuracy requirements of peripheral components such as slides and sliders, simplifies the assembly process, and effectively controls production costs. The control logic is also greatly simplified; the controller does not need to process complex dynamic load distribution signals, but only needs to perform basic processing on static load signals, reducing the difficulty of software development and debugging. In addition, the double bidirectional axial limiting structure at both ends of the weighing pin further improves the safety and reliability of equipment operation and extends the service life of the equipment.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-altitude work device, characterized in that, It includes a chassis (1), a lifting mechanism (2), a working platform (3), a connecting frame (4), and multiple weighing structures (5); The bottom end of the lifting mechanism (2) is movably connected to the chassis (1), and the top end is movably connected to the connecting frame (4); The upper end of each weighing structure (5) forms a positioning and locking connection with the bottom plate of the working platform (3) to eliminate relative displacement, and the lower end forms a flexible connection with the top plate of the connecting frame (4) to achieve radial limiting and vibration absorption. The load of the working platform (3) is vertically transmitted to the connecting frame (4) through multiple sets of the weighing structure (5); the connecting frame (4) is set between the lifting mechanism (2) and the weighing structure (5), so that the weighing structure (5) can measure the static vertical load and block the interference caused by the amplitude change of the lifting mechanism (2).

2. The aerial work platform according to claim 1, characterized in that, The weighing structure (5) is configured in two groups and is symmetrically arranged along the width direction of the connecting frame (4); each group of the weighing structure (5) includes two weighing pins spaced apart along the length direction of the connecting frame (4).

3. The aerial work platform according to claim 2, characterized in that, Each of the weighing pins includes a bearing support (51), a first connecting part (52) integrally connected to the top surface of the bearing support (51), and a second connecting part (53) integrally connected to the bottom surface of the bearing support (51), and the diameters of the first connecting part (52) and the second connecting part (53) are both smaller than the diameter of the bearing support (51); The top surface of the bearing support (51) abuts against the bottom plate of the working platform (3), and the bottom surface abuts against the top plate of the connecting frame (4); The first connecting part (52) is locked to the bottom plate of the working platform (3) by the first locking part (54) to achieve axial limiting and circumferential positioning of the upper part of the symmetrical weight structure (5); The second connecting part (53) and the top plate of the connecting frame (4) are locked together by the flexible connecting part (55) and the second locking part (56) to achieve bidirectional axial limiting of the lower part of the symmetrical weight structure (5).

4. The aerial work platform according to claim 3, characterized in that, The first connecting part (52) includes a connecting post (521) and a limiting block (522) integrally formed on the outer peripheral wall of the connecting post (521). The bottom plate of the work platform (3) is provided with a first through hole (31) adapted to the connecting column (521) and a slot (32) adapted to the limiting block (522) and connected to the first through hole (31). The limiting block (522) is inserted into the slot (32) to realize the circumferential positioning of the weighing pin. The upper outer peripheral wall of the connecting column (521) extending out of the first through hole (31) is provided with external thread. The axial locking of the weighing pin is achieved by engaging the locking nut with the external thread. The locking nut forms the first locking element (54).

5. The aerial work platform according to claim 3, characterized in that, The second connecting part (53) is a cylindrical column structure, and the top plate of the connecting frame (4) is provided with a second through hole (41). The second connecting part (53) passes through the second through hole (41) from top to bottom. An elastic damping bushing is fitted on the shaft section extending from the lower surface of the top plate of the connecting frame (4). The outer diameter of the elastic damping bushing is larger than the diameter of the second through hole (41). The second connecting part (53) extends out of the lower end of the elastic damping bushing and has an external thread. By screwing the locking nut into the external thread, the elastic damping bushing is pressed against the lower surface of the top plate of the connecting frame (4), thereby achieving axial fixation between the second connecting part (53) and the connecting frame (4). The elastic damping bushing is formed as a flexible connecting part (55), and the locking nut is formed as a second locking part (56).

6. The aerial work platform according to claim 4 or 5, characterized in that, The elastic damping bushing is a rubber sleeve.

7. The aerial work platform according to claim 5, characterized in that, The lifting mechanism (2) is a scissor boom; The chassis (1) has a first groove (11) extending along the length direction and arranged opposite to each other along the width direction at the top. The fixed hinge end of the bottom of the scissor boom is hinged to the chassis (1), and the movable end is provided with a first connecting shaft (21). The first connecting shaft (21) is provided with a first slider (22) on both ends coaxially. The first slider (22) is embedded in the first groove (11) on the corresponding side and can slide back and forth along its length direction. The connecting frame (4) is provided with a second slide groove (42) extending along the length direction and arranged opposite to each other along the width direction. The fixed hinge end of the top of the scissor arm is hinged to the connecting frame (4), and the movable end is hinged to a second connecting shaft (23). The two ends of the second connecting shaft (23) are coaxially provided with second sliders (24). The second sliders (24) are embedded in the corresponding second slide grooves (42) and can slide back and forth along their length direction.

8. The aerial work platform according to claim 7, characterized in that, Along the width direction of the connecting frame (4), the second connecting part (53) and the second slider (24) are arranged side by side with a gap between them.

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