Arm frame hinged support mechanism of overhead working truck

Abstract

The invention relates to the technical field of overhead working trucks, and discloses an overhead working truck arm support hinged support mechanism which comprises a hinged support of an integral structure formed by welding a left support body and a right support body, the axial distance between a telescopic arm and a folding arm is shortened, and compact layout of an arm support is achieved. A reinforcing shaft penetrating through the right base body is arranged in the left base body and matched with a V-shaped connecting piece to transmit multidirectional loads of the leveling oil cylinder and the variable-amplitude oil cylinder in a concentrated mode, and stress concentration is dispersed. The telescopic arm is connected with the left seat body through a connecting arm, the connecting arm adopts an inverted V-shaped hollow structure to hide the leveling oil cylinder, and the connecting rigidity of the connecting arm and the variable-amplitude oil cylinder is enhanced through a reinforcing frame. The folding arm, the balance pull rod and the rotary table form a parallel four-connecting-rod mechanism, and it is ensured that the pitch angle of the hinge seat is stable when the boom changes amplitude. The cantilever crane hinged support mechanism is compact in structure, reduces bending moment and stress, prolongs the anti-fatigue life, enhances the stability of a working platform, and is suitable for the field of overhead working trucks.

Description

Technical Field

[0001] This invention relates to the field of aerial work platform technology, specifically to an aerial work platform boom hinge mechanism. Background Technology

[0002] In traditional aerial work platform boom systems, the telescopic boom and folding boom are typically hinged together via independent articulation joints. Because the leveling cylinders on existing booms are externally mounted, a significant axial installation distance must be reserved at the ends of the two booms to meet the connection space requirements. This layout has a significant drawback: Extended lever arm and increased bending moment: The telescopic boom (bearing the work platform and load) constitutes a cantilever beam structure. The bending moment at its end is proportional to the length of the lever arm from the load application point to the hinge point of the folding boom and the vehicle body turntable. A larger installation distance causes the "effective cantilever starting point" of the telescopic boom to be far from the vehicle body, effectively extending the lever arm. This design leads to a significant increase in the bending moment acting on the hinge seat, the folding boom connection point, and the boom structure. This not only significantly increases the bending stress at the connection points, accelerating structural fatigue, but also increases the elastic deformation (deflection) of the boom system, affecting the positioning accuracy and stability of the work platform.

[0003] Insufficient structural stiffness and cumulative deformation: When subjected to complex alternating loads, the long transition section (including the articulated seat, the front end of the telescopic arm, and the front end of the folding arm) is prone to the superposition of tensile, compressive, shear, and torsional deformations due to the gaps between multiple body connections and structural elasticity. This multi-source micro-deformation not only weakens the overall stiffness of the system, but also causes lag and deviation in the motion transmission of the luffing cylinder and the leveling cylinder, reducing the accuracy of motion control.

[0004] Low space utilization: The installation of the leveling cylinder requires additional space, which limits the compact design of the articulated seat structure and makes it difficult to meet the requirements of modern aerial work platforms for lightweight, high load-bearing capacity and small turning radius.

[0005] Therefore, a boom hinge mechanism for aerial work platforms is proposed to address the current shortcomings. Summary of the Invention

[0006] In order to solve the problems of the prior art, the present invention provides a boom hinge mechanism for aerial work platforms.

[0007] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned technology and provide a boom hinge mechanism for aerial work vehicles.

[0008] To solve the above-mentioned technical problems, the technical solution provided by the present invention is a boom hinge mechanism for an aerial work platform vehicle, comprising: A hinged base, comprising a left base body and a right base body fixedly connected, wherein a connecting member is provided inside the left base body; The telescopic arm has a connecting arm fixedly installed at its front end, which is connected to the upper end of the left seat body. Reinforcing frames are symmetrically arranged on both sides of the connecting arm, and a fixed seat is fixedly installed inside the front end of the connecting arm. A leveling cylinder, wherein the cylinder body of the leveling cylinder is rotatably connected to one end of the fixed base, and the piston rod of the leveling cylinder is rotatably connected to the upper end of the connecting piece; A luffing cylinder, wherein the cylinder body of the luffing cylinder is rotatably connected to the reinforcing frame, and the piston rod of the luffing cylinder is rotatably connected to the bottom end of the connecting piece; A folding arm, one end of which is rotatably connected to the upper end of the right seat; A balance rod is provided, which is arranged parallel to the folding arm, and one end of the balance rod is rotatably connected to the bottom end of the right seat.

[0009] As an improvement, the left seat body has an L-shaped side and the right seat body has a long strip-shaped side. The vertical sides of the right seat body and the left seat body are set at an acute angle, and the bottom side of the right seat body is flush with the vertical side of the left seat body.

[0010] As an improvement, the lower part of the left seat is provided with a reinforcing shaft that passes through the right seat, and the connecting piece is fixedly mounted on the reinforcing shaft.

[0011] As an improvement, a reinforcing member is provided through the rear ends of the left and right seats, and through holes are provided at both ends of the reinforcing member corresponding to the rear sides of the left and right seats.

[0012] As an improvement, the connector has a V-shaped structure with its opening facing the telescopic arm, and the bottom end of the connector extends to the outside of the left seat.

[0013] As an improvement, the connecting arm and the telescopic arm have an inverted V-shaped structure and their openings face the luffing cylinder.

[0014] As an improvement, the fixed seat includes a fixed frame symmetrically arranged on both sides of the connecting arm and connected to the reinforcing frame, and the leveling cylinder is located inside the fixed frame and its cylinder body is rotatably connected to the end of the fixed seat away from the hinge seat.

[0015] The advantages of this invention compared to the prior art are: By incorporating the leveling cylinder within the telescopic boom, the additional installation space for the leveling cylinder is reduced, thereby significantly shortening the axial installation distance between the telescopic boom and the folding boom. This results in a more compact boom end structure and effectively reduces the overall space required.

[0016] Shortening the installation distance between the telescopic boom and the folding boom significantly reduces the lever arm length of the working load on the hinge seat (especially the connection point between the upper end of the right seat and the folding boom) and the overall boom structure. Under the same load and boom length conditions, this results in a significant reduction in the bending moment acting on the connection point and the hinge seat, thereby significantly reducing the bending stress they bear and effectively improving the fatigue life and structural reliability of the hinge seat and connection point.

[0017] The shortened installation distance allows the hinge points between the telescopic boom and the articulated base, as well as between the folding boom and the articulated base, to be more spatially concentrated, significantly shortening the force transmission path. Combined with the integral high-rigidity articulated base, this effectively reduces hysteresis and errors caused by structural deformation during force transmission, enabling the luffing cylinder's movements to be more accurately translated into the motion of the telescopic boom's end.

[0018] The use of a reinforcing shaft running through both the left and right seats significantly enhances the bending and torsional stiffness of the hinged seat. Simultaneously, a V-shaped connector fixed to the reinforcing shaft receives and transmits bidirectional forces from both the leveling and luffing cylinders, achieving concentrated transmission and rational distribution of multi-directional forces to the reinforcing shaft and the overall hinged seat. This effectively avoids the risk of stress concentration and fatigue failure caused by excessive loads on a single hinge point.

[0019] The connecting arm adopts an inverted V-shaped structure and is designed as a hollow open type. Combined with its fixed seat and reinforcement frame, it provides built-in installation space for the leveling cylinder, realizing the concealed installation of the leveling cylinder. This not only saves external installation space and helps to further shorten the axial installation distance of the boom, but also effectively avoids the risk of accidental collision or damage that the leveling cylinder may suffer from direct exposure, thus improving the durability and reliability of the system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a boom hinge mechanism for an aerial work platform according to the present invention. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the structure of a boom hinge mechanism for an aerial work platform according to the present invention. Figure 2 .

[0022] Figure 3 This is a top view of a boom hinge mechanism for an aerial work platform according to the present invention.

[0023] Figure 4 yes Figure 3 Sectional view at point AA.

[0024] Figure 5 yes Figure 4 A magnified view of a section at point B in the middle.

[0025] Figure 6This is a schematic diagram of the telescopic boom portion in the boom hinge mechanism of an aerial work vehicle according to the present invention.

[0026] Figure 7 yes Figure 6 A magnified view of a section at point C.

[0027] Figure 8 This is a schematic diagram of the hinge seat structure in the boom hinge mechanism of an aerial work vehicle according to the present invention. Figure 1 .

[0028] Figure 9 This is a schematic diagram of the hinge seat structure in the boom hinge mechanism of an aerial work vehicle according to the present invention. Figure 2 .

[0029] Figure 10 This is a schematic diagram of the internal structure of the hinge seat in the boom hinge seat mechanism of an aerial work vehicle according to the present invention.

[0030] Figure 11 This is a schematic diagram of the retracted state structure of the boom hinge mechanism of an aerial work platform according to the present invention. Figure 1 .

[0031] Figure 12 yes Figure 11 A magnified view of a section at point D.

[0032] Figure 13 This is a schematic diagram of the usage state of the boom hinge mechanism of an aerial work vehicle according to the present invention.

[0033] Figure 14 yes Figure 13 A magnified view of a section at point E in the middle.

[0034] As shown in the figure: 1. Hinge seat; 101. Left seat body; 102. Right seat body; 2. Connecting parts; 3. Telescopic boom; 4. Connecting boom; 5. Reinforcing frame; 6. Fixture base; 601. Fixture bracket; 7. Leveling cylinder; 8. Luffing cylinder; 9. Folding arm; 10. Balance rod; 11. Reinforcing shaft; 12. Reinforcing component; 13. Through hole. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the invention clearer, the technical solutions of the embodiments of the invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] In the description of the embodiments of the invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the invention. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of the embodiments of the invention, "a plurality of" means at least two.

[0039] In the description of the embodiments of the invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the invention according to the specific circumstances.

[0040] As shown in the attached figures, a boom hinge mechanism for an aerial work platform effectively shortens the installation distance between the telescopic boom 3 and the folding boom 9, while ensuring the stability of the hinge seat 1's posture during operation, providing a safe and reliable foundation for aerial work.

[0041] The hinge mechanism includes: The hinge base 1 includes a left seat 101 and a right seat 102 that are fixedly connected. The adjacent sides of the left seat 101 and the right seat 102 are connected by welding, realizing a direct connection between the left seat 101 and the right seat 102, reducing the space occupied by the hinge base 1, effectively shortening the installation distance between the telescopic arm 3 and the folding arm 9, and making the structure more compact.

[0042] During implementation, since the telescopic arm 3 (carrying the working platform and load) is equivalent to a cantilever beam, the magnitude of the bending moment borne by its end (i.e. near the hinge point between its end and the hinge seat 1) depends on the length of the "lever arm" of the load from the end hinge point. After reducing the installation distance between the telescopic arm 3 and the folding arm 9, the "effective cantilever starting point" of the telescopic arm 3 is moved towards the vehicle body, shortening the lever arm from the load application point to the connection point between the folding arm 9 and the vehicle body turntable.

[0043] That is, under the same workload and telescopic boom 3 length, the bending moment acting on the connection point between the upper end of the right seat 102 and the folding arm 9, as well as the hinge seat 1 and the boom structure, is greatly reduced. The reduction in bending moment reduces the bending stress borne by the connection point between the upper end of the right seat 102 and the folding arm 9 and the hinge seat 1, thereby improving their fatigue life and reliability. At the same time, it can reduce the bending deformation (deflection) of the telescopic boom 3 and the folding arm 9 themselves, making the position of the work platform more stable under load.

[0044] Furthermore, in traditional articulated joint structures, the installation distance between the telescopic arm 3 and the folding arm 9 is relatively large, meaning there is a long transition section at the ends of the telescopic arm 3 and the folding arm 9. This transition section (composed of the articulated joint 1, telescopic arm 3, and folding arm 9) is prone to slight elastic deformation (such as a combination of tension, compression, shear, and torsion) under stress. Shortening the installation distance between the telescopic arm 3 and the folding arm 9 makes the hinge points of the telescopic arm 3 and the articulated joint 1 and the folding arm 9 and the articulated joint 1 more spatially concentrated, resulting in a shorter force transmission path. Simultaneously, the welded integral articulated joint 1 greatly enhances its overall structural rigidity and reduces deformation sources in intermediate connection links. Moreover, it allows the movement of the luffing cylinder 8 to be accurately converted into the movement of the end of the telescopic arm 3, reducing hysteresis and errors caused by structural deformation.

[0045] Specifically, the left seat 101 has an L-shaped side structure, and the right seat 102 has a long strip-shaped side structure. The vertical sides of the right seat 102 and the left seat 101 are set at an acute angle. The asymmetrical arrangement between the right seat 102 and the left seat 101 provides space and installation angle for the folding arm 9 and the balance rod 10 to be installed on the right seat 102.

[0046] The bottom side of the right base 102 is flush with the vertical side of the left base 101 to maximize the welding surface and improve structural strength.

[0047] The left seat 101 is equipped with a connector 2. Specifically, the lower part of the left seat 101 is equipped with a reinforcing shaft 11 that passes through the right seat 102. The reinforcing shaft 11 significantly enhances the bending and torsional stiffness of the hinge seat 1. The connector 2 is fixedly installed on the reinforcing shaft 11. By fixing the connector 2 on the reinforcing shaft 11, the concentrated transmission and dispersion of forces acting in multiple directions are realized, avoiding fatigue failure caused by excessive load on a single hinge point.

[0048] The connecting piece 2 simultaneously receives the forces from the leveling cylinder 7 and the luffing cylinder 8, and effectively transmits the forces to the reinforcing shaft 11 and the hinge seat 1, thereby driving the telescopic arm 3 to move.

[0049] The connector 2 has a V-shaped structure with its opening facing the telescopic arm 3, and the bottom end of the connector 2 extends to the outside of the left seat 101.

[0050] The V-shaped opening design of the connector 2 enables it to form a reasonable torque distribution when bearing the leveling force of the leveling cylinder 7 and the luffing force of the luffing cylinder 8, ensuring that the telescopic boom 3 maintains a stable posture during the luffing process.

[0051] In addition, a reinforcing member 12 is provided through the rear ends of the left seat 101 and the right seat 102. In this embodiment, the reinforcing member 12 is made of channel steel and its open side is fixedly connected to the rear side of the left seat 101 and the right seat 102. The rigidity of the hinge seat 1 is further improved by the cooperation between the reinforcing member 12 and the reinforcing shaft 11.

[0052] Meanwhile, the two ends of the reinforcing member 12 are provided with through holes 13 corresponding to the rear sides of the left seat 101 and the right seat 102, forming a closed pipe that runs through the left seat 101 and the right seat 102. This allows the hydraulic lines to be concealed inside the hinge seat 1, which can slow down the aging of the hydraulic lines and avoid scratches that are easy to occur on external equipment. At the same time, the use of the reinforcing member 12 to form a pipe channel can avoid the occupation of extra space when installing hydraulic lines, ensuring the compactness of its structure. Furthermore, when the boom is luffing, the hydraulic lines move with the hinge seat 1 as a whole, avoiding fatigue cracking caused by repeated bending of traditional hoses.

[0053] Telescopic arm 3, the front end of which is fixedly provided with a connecting arm 4 connected to the upper end of the left seat 101, and the other end of which is connected to the working platform. At the same time, an auxiliary leveling cylinder connected to the leveling cylinder 7 is provided between the working platform and the telescopic arm 3.

[0054] The connecting arm 4 and the telescopic arm 3 have an inverted V-shaped structure, with their openings facing the luffing cylinder 8. The connecting arm 4 is a hollow structure with an open bottom, providing installation space for the leveling cylinder 7 and enabling the leveling cylinder 7 to be installed in a concealed manner.

[0055] Reinforcing frames 5 are symmetrically arranged on both sides of the connecting arm 4. The reinforcing frames 5 are plate-shaped structures that connect the connecting arm 4 and the telescopic arm 3, ensuring the structural strength and connection stability between the connecting arm 4 and the telescopic arm 3.

[0056] Meanwhile, the bottom of the end of the reinforcing frame 5 away from the hinge seat 1 extends to the lower outer side of the telescopic arm 3 to form a connecting structure, thereby realizing the rotational connection with the cylinder body of the luffing cylinder 8.

[0057] A fixing seat 6 is fixedly installed inside the front end of the connecting arm 4.

[0058] The fixing base 6 includes two fixing frames 601 symmetrically arranged on both sides of the connecting arm 4 and connected to the reinforcing frame 5. The fixing frames 601 are symmetrically arranged on both sides of the connecting arm 4 and connected to the reinforcing frame 5. The front end of the fixing frame 601 extends to the front end of the connecting arm 4 and is rotatably connected to the left seat body 101 to enhance the stability of the connection between the connecting arm 4 and the left seat body 101.

[0059] Meanwhile, the mounting space formed between the fixed brackets 601 allows for the concealed installation of the leveling cylinder 7, avoiding the installation of the leveling cylinder 7 on the outside of the connecting arm 4, and also helps to shorten the installation distance between the telescopic arm 3 and the folding arm 9.

[0060] The leveling cylinder 7 is located inside the fixed frame 601 and its cylinder body is rotatably connected to the end of the fixed seat 6 away from the hinge seat 1. The piston rod of the leveling cylinder 7 is rotatably connected to the upper end of the connecting piece 2. The leveling cylinder 7 is installed in the installation space formed between the fixed brackets 601, so as to achieve its concealed installation and avoid the leveling cylinder 7 being directly exposed on the outside of the connecting arm 4. This not only saves installation space, but also avoids the risk of it being accidentally bumped or damaged from the outside. Specifically, the cylinder body of the leveling cylinder 7 is rotatably connected to the end of the fixed seat 6 away from the hinge seat 1, so that the leveling cylinder 7 can rotate freely under the support of the fixed seat 6, thereby realizing its telescopic movement. In turn, the automatic balance adjustment of the working platform during boom luffing is realized through the action of the leveling cylinder 7 and the auxiliary leveling cylinder.

[0061] The luffing cylinder 8 has its cylinder body rotatably connected to the reinforcing frame 5, and its piston rod is rotatably connected to the bottom end of the connecting piece 2. During extension and retraction, the luffing cylinder 8 drives the connecting arm 4 and the telescopic arm 3 connected thereto to rotate around the connection point between the connecting arm 4 and the left seat 101 by pushing / pulling the bottom end of the connecting piece 2, thereby changing the elevation angle of the telescopic arm 3.

[0062] Folding arm 9, one end of which is rotatably connected to the upper end of right seat 102, and the other end of which is connected to the vehicle body via a turntable.

[0063] The balance rod 10 is arranged parallel to the folding arm 9, with one end rotatably connected to the bottom end of the right seat 102 and the other end connected to the turntable.

[0064] The folding boom 9, the balance bar 10, the right seat 102, and the turntable form a parallel four-bar linkage. During boom luffing (changing the elevation angle), this parallel four-bar linkage ensures that the pitch angle of the articulated seat 1 relative to the horizontal plane or the vehicle body remains fixed, thus improving its stability.

Claims

1. A boom hinge mechanism for an aerial work platform, characterized in that, include: The hinge seat (1) includes a left seat body (101) and a right seat body (102) that are fixedly connected. The left seat body (101) is provided with a connector (2). Telescopic arm (3), the front end of the telescopic arm (3) is fixedly provided with a connecting arm (4) connected to the upper end of the left seat (101), the two sides of the connecting arm (4) are symmetrically provided with reinforcing frames (5), and the front end of the connecting arm (4) is fixedly installed with a fixed seat (6). The leveling cylinder (7) has its cylinder body rotatably connected to one end of the fixed seat (6), and its piston rod is rotatably connected to the upper end of the connecting piece (2). Luffing cylinder (8), the cylinder body of the luffing cylinder (8) is rotatably connected to the reinforcing frame (5), and the piston rod of the luffing cylinder (8) is rotatably connected to the bottom end of the connecting piece (2); Folding arm (9), one end of which is rotatably connected to the upper end of the right seat (102); The balance rod (10) is arranged parallel to the folding arm (9), and one end of the balance rod (10) is rotatably connected to the bottom end of the right seat (102).

2. The boom hinge mechanism of an aerial work platform according to claim 1, characterized in that: The left seat (101) has an L-shaped side and the right seat (102) has a long strip-shaped side. The vertical sides of the right seat (102) and the left seat (101) are set at an acute angle, and one side of the bottom of the right seat (102) is flush with the vertical side of the left seat (101).

3. The boom hinge mechanism of an aerial work platform according to claim 2, characterized in that: The lower part of the left seat (101) is provided with a reinforcing shaft (11) that passes through the right seat (102), and the connecting piece (2) is fixedly installed on the reinforcing shaft (11).

4. The boom hinge mechanism of an aerial work platform according to claim 3, characterized in that: The connector (2) has a V-shaped structure with its opening facing the telescopic arm (3), and the bottom end of the connector (2) extends to the outside of the left seat (101).

5. The boom hinge mechanism of an aerial work platform according to claim 2, characterized in that: The left seat (101) and the right seat (102) are provided with a reinforcing member (12) through their rear ends. The two ends of the reinforcing member (12) are provided with through holes (13) corresponding to the rear sides of the left seat (101) and the right seat (102).

6. The boom hinge mechanism of an aerial work platform according to claim 1, characterized in that: The connecting arm (4) and the telescopic arm (3) have an inverted V-shaped structure and their openings face the variable amplitude cylinder (8).

7. The boom hinge mechanism of an aerial work platform according to claim 1, characterized in that: The fixed seat (6) includes a fixed frame (601) symmetrically arranged on both sides of the connecting arm (4) and connected to the reinforcing frame (5). The leveling cylinder (7) is located inside the fixed frame (601) and its cylinder body is rotatably connected to the end of the fixed seat (6) away from the hinge seat (1).

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