Movable supporting leg sliding block assembly for large-height overhead working truck

Abstract

The invention provides a movable supporting leg sliding block assembly for a large-height overhead working truck. The technical field relates to high-altitude operation equipment. The technical problems that a traditional flat plate sliding block cannot adapt to supporting leg deflection and flexural deflection, the contact area is small, and stress is concentrated are solved. According to the technical scheme, the device comprises a sliding block mounting seat arranged in a fixed supporting leg box, a supporting sliding block with a double-arc-surface structure and a side baffle connecting plate; the arc surface A of the supporting sliding block is matched with the inner cavity of the mounting base to achieve self-adaptive rotation, and the arc surface B is designed according to the maximum stress deformation curvature of the supporting leg, so that the arc surface B can still keep full contact when the supporting leg deflects or bends. The supporting leg has the beneficial effects that the contact area is obviously increased, the local stress is reduced, and the supporting reliability and safety of the supporting leg are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aerial work equipment, and particularly relates to a movable outrigger sliding block assembly for a high-altitude aerial work truck. BACKGROUND

[0002] The aerial work truck, also known as a truck-mounted mobile aerial work platform, is a special equipment for high-altitude work widely used in municipal, power, communication and landscaping fields. It provides a stable support base for the work platform by unfolding the movable outriggers and supporting on the ground, significantly improving the vehicle's anti-rollover ability and ensuring the safety of high-altitude work. As the core component for transmitting support force, the structure of the movable outrigger directly affects the safety performance of the vehicle.

[0003] At present, the movable outrigger of the aerial work truck mostly adopts a multi-stage sleeve type telescopic structure. To reduce the wear and tear between the outriggers at different levels and between the outriggers and the fixed leg box, sliding support devices are generally provided on the inner walls of the fixed leg box and the interiors of the movable outriggers at different levels, among which the sliding friction pair composed of the sliding block and the outer surface of the outrigger is the most common. To ensure smooth extension and retraction of the outrigger and avoid jamming, a cooperation gap of 1mm to 2mm is usually designed between the sliding block and the surface of the movable outrigger. In the prior art, such sliding blocks mostly adopt a built-in flat plate type, which is simple in structure and easy to install, and is widely used in medium and small height aerial work trucks.

[0004] However, this flat plate sliding block structure has significant limitations. When the aerial work truck enters the working state and the movable outrigger bears a large support force, two main problems are exposed: firstly, due to the existence of the cooperation gap, a certain relative inclination angle will be generated between the movable outrigger and the fixed leg box, and the rigidly installed flat plate sliding block cannot adapt to this angle change, resulting in a decrease in the contact area between the sliding block and the outrigger and a sharp increase in the local contact stress; secondly, the movable outrigger will deform under the action of a large support force, and the upper surface of the outrigger will present a certain curvature as an arc surface due to the deformation. Since the surface of the flat plate sliding block is a plane, it cannot effectively fit the arc surface, further reducing the actual contact area and causing stress concentration.

[0005] For medium and small work trucks, since the outrigger span is short and the support load is small, the deformation of the outrigger is limited, and the flat plate sliding block can still meet the use requirements. However, for high-altitude aerial work trucks, the outrigger span is large and the support force is significantly increased, and the deformation and inclination angle of the outrigger cause a sharp increase in the local stress between the flat plate sliding block and the outrigger, which exceeds the allowable value, resulting in crushing of the outrigger surface or damage to the sliding block, seriously affecting the structural safety and reliability. Therefore, a new type of sliding block structure is urgently needed, which can adapt to the angular deflection and deflection of the outrigger, realize large-area uniform contact, and improve the stress distribution to meet the harsh working condition requirements of high-altitude aerial work trucks. SUMMARY

[0006] The application aims to overcome the problems in the background art and provide a movable outrigger sliding block assembly for a large-height aerial work platform.

[0007] The core idea of the application is to set a support sliding block with double circular arc surfaces, one of which cooperates with the inner cavity of the mounting seat to realize self-adaptive rotation, and the other of which is designed according to the maximum stress deformation curvature of the outrigger, so that the sliding block can still be in full contact with the outrigger when the outrigger bears a large load and is deflected or flexed, significantly increasing the contact area and reducing the local extrusion stress, thereby effectively solving the problems of stress concentration and easy damage of the traditional flat sliding block, and improving the outrigger support reliability and safety.

[0008] To achieve the above-mentioned application purposes, the application adopts the technical scheme, specifically a movable outrigger sliding block assembly for a large-height aerial work platform, comprising a sliding block mounting seat arranged on the inner top wall of the fixed outrigger box door, a support sliding block and a side stop connecting plate.

[0009] The sliding block mounting seat has a circular arc type inner cavity and a threaded hole.

[0010] The support sliding block has a double circular arc surface structure, comprising a circular arc surface A concentrically arranged with the circular arc type inner cavity of the sliding block mounting seat, and a circular arc surface B cooperated with the upper surface of the movable outrigger; the support sliding block is further provided with a circular arc type groove concentric with the circular arc surface A.

[0011] The side stop connecting plate is provided with a pin shaft and a mounting hole, the pin shaft is gap-fitted with the circular arc type groove of the support sliding block, and the mounting hole is connected with the threaded hole of the sliding block mounting seat to mount the support sliding block in the sliding block mounting seat.

[0012] The support sliding block can rotate in the circular arc type inner cavity of the sliding block mounting seat to adapt to the angle change between the movable outrigger and the fixed outrigger box, and realize surface contact between the circular arc surface B and the movable outrigger when the movable outrigger is stressed.

[0013] Further, the circular arc surface B of the support sliding block is provided with an X-shaped oil storage groove for storing lubricating oil, so as to form oil film lubrication during the extension and retraction of the movable outrigger, reduce the movement resistance and wear.

[0014] Further, the intersection between the circular arc surface B and the circular arc surface A is provided with a round corner structure to avoid stress concentration and prevent scratching the surface of the outrigger during movement.

[0015] Further, the curvature radius of the circular arc surface B is the same as the curvature radius of the arc surface formed by the deflection deformation of the movable outrigger under maximum stress; the calculation formula of the curvature radius of the circular arc surface B is:

[0016] R = E x I / F x a x b / L

[0017] Wherein:

[0018] R is the radius of curvature of the circular arc surface B, E is the elastic modulus of the movable leg material, I is the moment of inertia of the movable leg cross section, L is the distance from the support force to the tail end of the horizontal leg, a is the distance from the support slider to the tail end of the movable leg, b is the distance from the support slider to the front end of the movable leg, F is the maximum support force on the front end of the horizontal leg, so that the support slider and the leg surface are fully contacted and matched when the leg bears the maximum load, effectively dispersing the local stress.

[0019] Further, the cooperation gap between the movable leg and the support slider is 1-2mm, which not only ensures the free expansion of the leg, but also avoids impact or vibration caused by too large gap.

[0020] Further, the slider mounting seat is welded to the inner top wall of the fixed leg box, ensuring the rigidity and stability of the mounting seat, which can withstand high load generated during high height operation.

[0021] Further, two slider mounting seats are arranged in the fixed leg box, and the line connecting the two slider mounting seats is perpendicular to the movement direction of the movable leg, providing symmetrical support and enhancing the overall stability of the leg system.

[0022] Further, the two sides of the support slider are provided with the arc-shaped grooves, and the pin shaft of the side stop connecting plate is matched with the arc-shaped grooves, so that the support slider is uniformly stressed and rotates more stably.

[0023] Further, the movable leg is a multi-stage telescopic structure, including a primary movable leg and a secondary movable leg, and the support slider is used for supporting the primary movable leg, which adapts to the complex stress condition of the multi-stage leg of the high height operation vehicle.

[0024] Further, the support slider is a replaceable modular structure, which is convenient for quick replacement after wear, reducing maintenance cost and time.

[0025] Compared with the prior art, the beneficial effects of the present application are:

[0026] 1. When the movable leg bears the support force and forms a certain angle with the fixed leg box, the arc surface A of the support slider is matched with the arc inner cavity of the mounting seat, so that the slider can adaptively rotate, thereby adjusting the support angle. This feature enables the arc surface B of the slider to always be parallel to the inclined leg surface, realizing large-area uniform contact and effectively avoiding the linear or point contact caused by angle mismatch of the traditional flat slider, significantly reducing the local extrusion stress of the leg contact area.

[0027] 2、When the deflection deformation of the active support leg occurs under the maximum support force, and the upper surface presents an arc-shaped curved surface, the curvature radius of the arc surface B of the support slider is designed to be the same as the curvature radius of the deformation curved surface of the leg, so that the two can be completely matched under the maximum load condition. This accurate curved surface matching realizes true full-contact support, fully disperses the concentrated stress, greatly improves the stress condition of the leg, and fundamentally prevents the crushing or plastic deformation of the leg caused by stress concentration.

[0028] 3、The active support leg can obtain optimized support effect under different stress conditions through the double mechanism of self-adaptive rotation and accurate curved surface matching. At the same time, the lubrication and wear-resistant design of the slider effectively reduces the friction and wear during the extension and retraction of the leg. The overall structure significantly improves the reliability, durability and safety performance of the leg system of the large-height aerial work vehicle, and solves the technical problem that the traditional flat slider cannot adapt to complex working conditions under large load. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, illustrate the application, and are used to explain the application together with the embodiments of the application, and do not constitute a limitation on the application.

[0030] Figure 1 is an enlarged structural schematic view of the overall installation position of the application and I.

[0031] Figure 2 is a schematic view of the active support leg and the support slider.

[0032] Figure 3 is a schematic view of the overall structure of the support slider.

[0033] Figure 4 is a front view of the installation slider.

[0034] Figure 5 is a bottom view of the installation slider.

[0035] Figure 6 is a side view of Figure 4 .

[0036] Figure 7 is a schematic view of the overall structure of the side stop connecting plate.

[0037] Figure 8 is a structural schematic view of the active support leg under the support force.

[0038] Figure 9 is a front view of the slider mounting seat.

[0039] The attached figures are labeled as follows: 01, fixed support leg box; 02, support slider; 03, side baffle connecting plate; 04, movable support leg; 05, primary movable support leg; 06, secondary movable support leg; 07, arc-shaped groove; 08, rounded corner structure; 09, X-shaped oil reservoir; 10, slider mounting base; 11, pin; 12, mounting hole; 13, arc surface A; 14, arc surface B. Detailed Implementation

[0040] 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.

[0041] Before delving into the specific structure of this invention, it is necessary to reiterate the existing technical problems it aims to solve. Currently, high-altitude aerial work platforms generally employ a concealed flatbed slider. This structure has two inherent defects: First, it cannot adapt to angle changes. Due to the 1-2mm assembly gap between the outriggers and the housing, when the outriggers bear enormous supporting forces, a slight angle is formed between them and the fixed outrigger housing. The rigidly installed flatbed slider cannot deflect accordingly, causing its contact with the outriggers to degenerate from ideal surface contact to line contact or even point contact, resulting in a sharp increase in local contact stress. Second, it cannot match the deformable surface of the outriggers. High-altitude aerial work platforms have long outriggers and heavy loads. Under maximum supporting force, the outriggers (especially the primary movable outriggers) will undergo significant deflection deformation, and their upper surfaces will bend into an arc-shaped surface. The planar structure of the flatbed slider cannot fit into this curved surface, further reducing the effective contact area and leading to stress concentration. These two problems combined can easily lead to crushing of the outrigger surface or damage to the slider itself, failing to meet the reliability requirements of the support system for high-altitude aerial work platforms.

[0042] To address the aforementioned shortcomings, this invention provides an innovative movable outrigger slider assembly, the core of which lies in an adaptive support system capable of simultaneously adapting to outrigger deflection and flexural deformation. This assembly is primarily integrated into the top wall inside the doorway of the fixed outrigger housing 01—a critical path for outrigger force transmission, where the force is most concentrated.

[0043] like Figures 1-9 As shown, the assembly mainly consists of three core components: slider mounting base 10, support slider 02, and side baffle connecting plate 03.

[0044] Slide mounting base 10: This component serves as the mounting base of the entire slide assembly. Two slide mounting bases 10 are fixed firmly on the inner top wall of the fixed leg box 01 door opening by welding, ensuring sufficient rigidity and mounting strength. Its core feature is a precisely machined circular arc-shaped inner cavity, the center of which is accurately determined. In addition, threaded holes are provided on the seat for connecting the side stop connecting plate 03.

[0045] Supporting slide 02: This is the core innovation of the invention, a modular functional component with a special double-circular-arc surface configuration. It includes:

[0046] (1) Circular arc surface A13: This surface is located on the upper part of the supporting slide 02, and its radius of curvature is exactly the same as and concentric with that of the circular arc-shaped inner cavity of the slide mounting base 10. This design allows the supporting slide 02 to rotate freely in the inner cavity of the mounting base with its center as the axis, which is the physical basis for achieving adaptive angle adjustment.

[0047] (2) Circular arc surface B14: This surface is located on the lower part of the supporting slide 02 and directly contacts the upper surface of the first movable leg 05. Its radius of curvature is not randomly set but calculated by the formula R = (E x I) / (F x a x b / L). Where E and I are the elastic modulus and cross-sectional moment of inertia of the leg material, F is the estimated maximum support force, and a, b, and L are the force arm distance parameters. This formula ensures that the radius of curvature of the circular arc surface B14 is exactly the same as the radius of curvature of the arc-shaped surface generated by the upper cover plate of the first movable leg 05 when it is deflected under the maximum load F, providing geometric assurance for full contact under maximum load.

[0048] (3) Circular arc-shaped groove 07: This groove is machined on the side wall of the supporting slide 02 and is concentric with the circular arc surface A13. Its function is to accommodate the pin shaft 11 of the side stop connecting plate 03, forming a clearance-fitted rotating pair that allows the slide to rotate while limiting it within the mounting base to prevent it from falling off.

[0049] (4) X-shaped oil storage groove 09 and round corner 08: An X-shaped oil storage groove is machined on the circular arc surface B14 to store lubricating grease, continuously forming a lubricating film during leg extension and retraction, effectively reducing friction and wear. Round corners are used at all sharp edges, especially at the junction of the circular arc surfaces B14 and A13, to avoid stress concentration and prevent scratches on the leg surface during movement.

[0050] Side stop connecting plate 03: This component serves as a connecting and limiting part. It is provided with a pin shaft 11 and a mounting hole 12. The pin shaft 11 is embedded in the circular arc-shaped groove 07 of the supporting slide 02, and the mounting hole 12 is fastened and connected with the threaded hole of the slide mounting base 10 by bolts. It "holds" the supporting slide 02 in the slide mounting base 10, completing the assembly of the entire assembly.

[0051] The present application realizes excellent performance improvement through the ingenious cooperation of the above-mentioned components: the slider mounting seat 10 provides a solid and geometrically accurate mounting reference. The cooperation of the arc surface A13 supporting the slider 02 and the inner cavity of the mounting seat gives the slider the ability to adaptively deflect, solving the problem of angle mismatch caused by the existence of clearance. The arc surface B14 supporting the slider 02, through its specific curvature based on calculation, solves the problem of curved surface fitting after the leg deformation, ensuring the contact area under maximum load. The side stop connecting plate 03 reliably realizes the detachable installation of the slider and ensures the realization of the rotating function. The details such as X-shaped oil storage tank 09 and round corner 08 further improve the durability and smoothness of the system from the perspectives of tribology and structural mechanics.

[0052] Working principle

[0053] The working principle of the present application revolves around the two main stress states of the movable leg:

[0054] Adaptive leg deflection state (non-maximum load): When the leg bears the support force and forms an angle with the fixed box, due to the clearance fit of the pin shaft 11 and the arc-shaped groove 07, the supporting slider 02 will not restrict this slight deflection of the leg. On the contrary, the inclination of the leg will push the supporting slider 02 through the contact surface, causing the arc surface A13 of the supporting slider 02 to rotate accordingly along the arc inner cavity of the slider mounting seat 10. This process ensures that the arc surface B14 of the supporting slider 02 always remains parallel to the upper surface of the inclined leg, thereby restoring the contact state from harmful point / line contact to beneficial large-area surface contact, significantly reducing the local pressure.

[0055] Adaptive leg bending state (maximum load): When the leg bears the maximum support force F, in addition to possible deflection, its main feature is deflection deformation, with the upper surface bending into an arc. At this time, since the curvature of the arc surface B14 is accurately calculated and processed in advance according to the formula, its curvature radius is exactly the same as the radius of the curved surface after the leg deformation. Therefore, under maximum load, the arc surface B14 can achieve complete conformal fitting with the leg deformation curve, with the contact area reaching the theoretical maximum. This allows the huge support force to be evenly transmitted through the maximum contact area, avoiding stress concentration and fundamentally preventing damage to the leg structure.

[0056] In summary, through the dual mechanisms of "adaptive rotation" and "precise curved surface matching", the present application intelligently deals with the complex deformation of the leg under different working conditions, always ensuring the optimal contact state and greatly improving the reliability, durability and safety of the outrigger system of the aerial work platform vehicle.

[0057] The above merely describes preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A mobile outrigger slide block assembly for a large height aerial lift, comprising: The slider mounting seat (10) is provided on the inner top wall of the door of the fixed leg box (01), and the support slider (02) and the side stop connecting plate (03) are supported. The slider mounting seat (10) has a circular arc cavity and a threaded hole. The support slider (02) has a double circular arc surface structure, including a circular arc surface A (13) concentrically arranged in the circular arc cavity of the slider mounting seat (10), and a circular arc surface B (14) matched with the upper surface of the movable leg (04); the support slider (02) is also provided with a circular arc groove (07) concentric with the circular arc surface A (13). The side stop connecting plate (03) is provided with a pin shaft (11) and a mounting hole (12), the pin shaft (11) is matched with the circular arc groove (07) of the support slider (02), and the mounting hole (12) is connected with the threaded hole of the slider mounting seat (10), so that the support slider (02) is installed in the slider mounting seat (10). The support slider (02) can rotate in the circular arc cavity of the slider mounting seat (10) to adapt to the angle change between the movable leg (04) and the fixed leg box (01), and realize surface contact between the circular arc surface B (14) and the movable leg (04) when the movable leg (04) is stressed.

2. The mobile outrigger truck assembly for a large height aerial device of claim 1, wherein, The circular arc surface B (14) of the support slider (02) is provided with an X-shaped oil storage groove (09) for storing lubricating oil.

3. The mobile outrigger truck assembly for a high lift aerial device of claim 1, wherein, The intersection of the circular arc surface B (14) and the circular arc surface A (13) is provided with a round corner structure (08).

4. The mobile outrigger truck assembly for a high lift aerial device of claim 1, wherein, The curvature radius of the circular arc surface B (14) is the same as the curvature radius of the arc surface formed by the deflection deformation of the movable leg (04) under the maximum stress state, and the calculation formula of the curvature radius of the circular arc surface B (14) is: R=(E×I) / (F×a×b / L) Wherein: R is the curvature radius of the circular arc surface B (14), E is the elastic modulus of the material of the movable leg (04), I is the moment of inertia of the cross section of the movable leg (04), L is the distance from the support force to the tail end of the horizontal leg, a is the distance from the support slider to the tail end of the movable leg (04), b is the distance from the support slider to the front end of the movable leg (04), and F is the maximum support force on the front end of the horizontal leg. The cooperation gap between the movable leg (04) and the support slider (02) is 1-2mm.

5. The mobile outrigger truck assembly for a large height aerial device of claim 1, wherein, The slider mounting seat (10) is welded to the inner top wall of the fixed leg box (01).

6. The mobile outrigger truck assembly for a large height aerial device of claim 1, wherein, Two slider mounting seats (10) are arranged in the fixed leg box (01), and the line connecting the two slider mounting seats (10) is perpendicular to the movement direction of the movable leg (04).

7. The mobile outrigger truck assembly for a large height aerial device of claim 1, wherein, The two sides of the support slider (02) are provided with circular arc grooves (07), and the pin shaft (11) of the side stop connecting plate (03) is matched with the circular arc groove (07).

8. The mobile outrigger truck assembly for a large height aerial device of claim 1, wherein, The movable leg (04) has a multi-stage telescopic structure, including a first movable leg (05) and a second movable leg (06), and the support slider (02) is used for supporting the first movable leg (05).

9. The mobile outrigger truck assembly for a large height aerial device of claim 1, wherein, The support slider (02) is a replaceable modular structure.

10. The mobile outrigger truck assembly for a large height aerial device of claim 1, wherein, ​

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