A boom luffing linkage

Abstract

The application discloses an arm support amplitude linkage mechanism and relates to the technical field of aerial work, which comprises a base, an arm support assembly, a connecting rod telescopic assembly and a driving assembly. The connecting rod telescopic assembly is connected between the base and the arm support assembly, and the connecting rod telescopic assembly forms a scissor type structure. The driving assembly is arranged on the connecting rod telescopic assembly, the driving assembly is in transmission connection with the arm support assembly, and the driving assembly can drive the arm support assembly to move and change amplitude. The arm support amplitude linkage mechanism has high stability when the arm support assembly changes amplitude, the length of the arm support assembly is shorter at the same working height, and deflection is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-altitude operation, and particularly relates to an arm support amplitude linkage mechanism. BACKGROUND

[0002] The straight-arm type high-altitude operation vehicle has an arm support assembly, which can be extended to a height of more than 10 meters to realize high-altitude operation. The arm support assembly can be directly connected with a rotating platform of the vehicle or indirectly connected with the rotating platform through a mounting accessory. A driving member for amplitude variation of the arm support assembly is arranged between the rotating platform and the arm support assembly, and drives the arm support assembly to move up and down to vary the amplitude. Due to the simple structure, this type of amplitude variation structure is basically adopted, but the movement of the center of gravity of the arm support assembly has a great influence on the stability of the vehicle when the arm support assembly varies the amplitude up and down.

[0003] Sometimes, in order to make the operation height higher, the length of the arm support assembly required is also longer, and the deflection of the arm support assembly is larger during the up and down amplitude variation of the arm support assembly, which has a greater test on the strength of the structural member. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the prior art. To this end, the present application provides an arm support amplitude linkage mechanism, which has high stability when the arm support assembly varies the amplitude, and the length of the arm support assembly required is shorter at the same operation height, thereby reducing the deflection.

[0005] The arm support amplitude linkage mechanism according to the embodiment of the present application comprises a base;

[0006] an arm support assembly;

[0007] a connecting rod telescopic assembly connected between the base and the arm support assembly, and forming a scissor type structure;

[0008] a driving assembly arranged in the connecting rod telescopic assembly, which is in transmission connection with the arm support assembly and can drive the arm support assembly to move and vary the amplitude.

[0009] According to the arm support variable amplitude linkage mechanism of the embodiment of the present application, at least the following advantages are achieved: the arm support assembly is connected with the base through the connecting rod telescopic assembly, when the driving assembly drives the arm support assembly to perform variable amplitude, the connecting rod telescopic assembly is linked with the arm support assembly, so that the hinge point of the arm support assembly can move, and the movement of the gravity center position of the arm support assembly is optimized. When the arm support assembly performs variable amplitude, the gravity center of the arm support assembly gradually moves to the overhanging end of the arm support assembly, and the stability of the whole vehicle in the backward direction is improved; when the arm support assembly performs variable amplitude, the gravity center of the arm support assembly moves to the counterweight end of the vehicle, and the stability of the whole vehicle in the forward direction is improved. The connecting rod telescopic assembly of the scissor type structure is telescoped with the variable amplitude of the arm support assembly, when the arm support assembly performs variable amplitude, the connecting rod telescopic assembly is also elongated, and the arm support assembly reaches the predetermined height, so the length of the arm support assembly itself can be shortened, and the deflection of the arm support assembly is reduced.

[0010] According to some embodiments of the present application, the connecting rod telescopic assembly comprises a first connecting rod, a second connecting rod and a third connecting rod, one end of the first connecting rod is hinged with the base, the other end is hinged with the arm support assembly, the second connecting rod is arranged in cross with the first connecting rod and is hinged at the cross, one end of the second connecting rod is slidingly connected with the base, the other end is hinged with the third connecting rod, the third connecting rod is also hinged with the arm support assembly, the third connecting rod is parallel with the first connecting rod, and the second connecting rod is parallel with the arm support assembly.

[0011] According to some embodiments of the present application, the first connecting rod and the second connecting rod are equal in length, and the cross points of the first connecting rod and the second connecting rod are the middle points respectively, the third connecting rod is half the length of the first connecting rod, and the distance between the hinge point of the third connecting rod and the hinge point of the arm support assembly and the length of the third connecting rod are equal.

[0012] According to some embodiments of the present application, a sliding groove is formed on the base, the guide direction of the sliding groove is parallel with the variable amplitude plane of the arm support assembly, the second connecting rod is provided with a sliding block, and the sliding block is matched with the sliding groove and can move along the sliding groove.

[0013] According to some embodiments of the present application, the driving assembly is a driving cylinder, the driving cylinder has a telescopic rod, the driving cylinder is hinged with the first connecting rod, and the movable end of the telescopic rod is hinged with the arm support assembly.

[0014] According to some embodiments of the present application, the hinge point of the telescopic rod and the arm support assembly and the hinge point of the third connecting rod and the arm support assembly are coincident.

[0015] According to some embodiments of the present application, a strip-shaped slot is arranged on the first connecting rod, the length direction of the strip-shaped slot is parallel to the length direction of the first connecting rod, and the driving cylinder is provided with a hinged rod which is inserted into the strip-shaped slot.

[0016] According to some embodiments of the present application, the free end of the arm support assembly is provided with an auxiliary arm which is hinged to the arm support assembly, and a leveling assembly is arranged between the auxiliary arm and the arm support assembly, the leveling assembly being capable of driving the auxiliary arm to rotate so as to change the included angle between the auxiliary arm and the arm support assembly.

[0017] According to some embodiments of the present application, the leveling assembly comprises a first leveling oil cylinder, one end of the first leveling oil cylinder being hinged to the arm support assembly and the other end being hinged to the auxiliary arm.

[0018] According to some embodiments of the present application, the leveling assembly further comprises a second leveling oil cylinder, one end of the second leveling oil cylinder being hinged to the connecting rod telescopic assembly and the other end being hinged to the arm support assembly, a plurality of hydraulic pipes being arranged in communication between the first leveling oil cylinder and the second leveling oil cylinder, and the first leveling oil cylinder and the second leveling oil cylinder being capable of mutual feedback adjustment.

[0019] Additional aspects and advantages of the present application will be given, partially in the following description, partially will become obvious from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described below in conjunction with the drawings and embodiments, in which:

[0021] Figure 1 Structure schematic view of the arm support amplitude linkage mechanism of the embodiment of the present application;

[0022] Figure 2 Structure schematic view of the connecting rod telescopic assembly in the embodiment of the present application;

[0023] Figure 3 Assembled explosion view of each component in the embodiment of the present application;

[0024] Figure 4 Structure schematic view of the driving assembly in the embodiment of the present application;

[0025] Figure 5 Connection structure schematic view of the first leveling oil cylinder in the embodiment of the present application;

[0026] Figure 6 Connection structure schematic view of the second leveling oil cylinder in the embodiment of the present application;

[0027] Figure 7 Hydraulic connection principle view of the first leveling oil cylinder and the second leveling oil cylinder in the embodiment of the present application.

[0028] Reference Signs:

[0029] Base 100, sliding groove 110, arm support assembly 200, connecting rod telescopic assembly 300, first connecting rod 310, strip-shaped groove 311, second connecting rod 320, sliding block 321, third connecting rod 330, driving assembly 400, driving cylinder 410, telescopic rod 420, auxiliary arm 500, leveling assembly 600, first leveling oil cylinder 610, second leveling oil cylinder 620. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explaining the present application, and should not be understood as a limitation of the present application.

[0031] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, etc. is based on the orientation or position relationship shown in the drawings, which is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as a limitation of the present application.

[0032] In the description of the present application, the plural refers to two or more. If there is a description of first, second, it is only for the purpose of distinguishing technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the sequence of technical features indicated.

[0033] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0034] Referring to Figure 1 The arm support luffing linkage mechanism of one embodiment of the present application includes a base 100, an arm support assembly 200, a connecting rod telescopic assembly 300, and a driving assembly 400.

[0035] The connecting rod telescopic assembly 300 is connected between the base 100 and the arm support assembly 200, and the connecting rod telescopic assembly 300 forms a scissor type structure.

[0036] The driving assembly 400 is arranged in the connecting rod telescopic assembly 300, the driving assembly 400 is in transmission connection with the arm support assembly 200, and the driving assembly 400 can drive the arm support assembly 200 to move and luff.

[0037] The up-and-down luffing of the boom assembly 200 can be simply understood as the change of the angle between the boom assembly 200 and the horizontal plane, so as to change the height position of the free end of the boom assembly 200. The free end of the boom assembly 200 is generally used for mounting a work platform, such as a work bar on which a person can stand.

[0038] On the original conventional straight-arm aerial working truck, the boom is hinged to the rotating platform. When the boom luffs, the hinge point cannot move, and the movement of the center of gravity of the boom cannot be optimized, which greatly affects the stability of the truck and even causes the truck to overturn. The boom assembly 200 is connected to the base 100 through the linkage telescopic assembly 300. When the driving assembly 400 drives the boom assembly 200 to luff up and down, the linkage telescopic assembly 300 is linked with the boom assembly 200, so that the hinge point of the boom assembly 200 can be changed, the movement of the center of gravity of the boom assembly 200 is optimized, and the stability of the truck can be improved. The base 100 can be part of the rotating platform or be fixed to the rotating platform as a mounting member. The rotating platform provides a rotating stroke for the boom assembly 200 and is a commonly used structure.

[0039] When the boom assembly 200 luffs up, the center of gravity of the boom assembly 200 gradually moves to the free end (the end for mounting a work platform, such as the work bar end) of the boom assembly 200, improving the stability of the truck in the rear-leaning direction; when the boom assembly 200 luffs down, the center of gravity of the boom assembly 200 moves to the counterweight end of the truck, improving the stability of the truck in the front-leaning direction.

[0040] The linkage telescopic assembly 300 of the scissor structure telescopes with the up-and-down luffing of the boom assembly 200. When the boom assembly 200 luffs up, the linkage telescopic assembly 300 also elongates to assist the boom assembly 200 to reach the predetermined height, so that the length of the boom assembly 200 itself can be shortened, reducing the deflection of the boom assembly 200.

[0041] Referring to Figure 2 As shown in the figure, it can be understood that the linkage telescopic assembly 300 includes a first linkage 310, a second linkage 320, and a third linkage 330. One end of the first linkage 310 is hinged to the base 100, and the other end is hinged to the boom assembly 200. The second linkage 320 is crosswise arranged with the first linkage 310 and is hinged at the intersection. One end of the second linkage 320 is slidingly connected to the base 100, and the other end is hinged to the third linkage 330. The third linkage 330 is also hinged to the boom assembly 200, and the third linkage 330 is parallel to the first linkage 310. The second linkage 320 is parallel to the boom assembly 200.

[0042] The first connecting rod 310, the second connecting rod 320 and the third connecting rod 330 constitute a scissor structure. When the driving assembly 400 drives the jib assembly 200 to change the amplitude, the sliding end of the second connecting rod 320 moves close to the hinged end of the first connecting rod 310, and the entire connecting rod telescopic assembly 300 will be elongated to assist the jib assembly 200 to change the amplitude upward. When the driving assembly 400 drives the jib assembly 200 to change the amplitude downward, the sliding end of the second connecting rod 320 moves away from the hinged end of the first connecting rod 310, and the entire connecting rod telescopic assembly 300 will be shortened, and the jib assembly 200 changes the amplitude downward.

[0043] When the jib assembly 200 changes the amplitude, the elongation of the connecting rod telescopic assembly 300 helps the jib assembly 200 to reach a predetermined height. At the same height, with the assistance of the connecting rod telescopic assembly 300, the jib assembly 200 can be shortened by a certain length, so the deflection of the jib assembly 200 is also reduced, which helps to improve the stability of the jib assembly 200.

[0044] During the elongation and shortening of the connecting rod telescopic assembly 300, the hinged point of the jib assembly 200 and the first connecting rod 310 also moves, so the center of gravity movement path of the jib assembly 200 can be changed and optimized.

[0045] It can be understood that the first connecting rod 310 and the second connecting rod 320 are equal in length, and the intersection points of the first connecting rod 310 and the second connecting rod 320 are the midpoints, respectively. The third connecting rod 330 is half the length of the first connecting rod 310, and the distance between the hinged point of the third connecting rod 330 and the jib assembly 200 and the hinged point between the first connecting rod 310 and the jib assembly 200 is equal to the length of the third connecting rod 330.

[0046] The third connecting rod 330 and the upper half of the first connecting rod 310 and the second connecting rod 320 constitute a diamond structure, and the stability of the elongation and shortening of the connecting rod telescopic assembly 300 is good, and the support structure has high strength.

[0047] Referring to Figure 3 It can be understood that the base 100 is provided with a sliding groove 110, the guide direction of the sliding groove 110 is parallel to the amplitude plane of the jib assembly 200, and the second connecting rod 320 is provided with a sliding block 321. The sliding block 321 cooperates with the sliding groove 110 and can move along the sliding groove 110.

[0048] The second connecting rod 320 is slidably connected with the base 100 through the cooperation of the sliding block 321 and the sliding groove 110. The sliding block 321 and the sliding groove 110 cooperate to move stably and have strong support capacity.

[0049] It can be understood that the driving assembly 400 is a driving cylinder 410, the driving cylinder 410 has an extension rod 420, the driving cylinder 410 is hinged to the first connecting rod 310, and the movable end of the extension rod 420 is hinged to the jib assembly 200.

[0050] The driving cylinder 410 is preferably a hydraulic cylinder, which is incompressible and has strong pressure transmission capacity. The driving cylinder 410 pushes the telescopic rod 420 to move, so as to push the boom assembly 200 to change the amplitude.

[0051] It can be understood that the articulation point of the telescopic rod 420 and the boom assembly 200 coincides with the articulation point of the third connecting rod 330 and the boom assembly 200.

[0052] The telescopic rod 420 and the boom assembly 200 need to be articulated, and the third connecting rod 330 and the boom assembly 200 also need to be articulated, and they share one articulation point, which can reduce the construction amount on the boom assembly 200, such as the hole opening or welding of components, and reduce the reduction of the structural strength of the boom assembly 200 due to the hole opening or the thermal deformation caused by the welding.

[0053] Referring to FIG. 1, Figure 4 It can be understood that the first connecting rod 310 is provided with a strip-shaped slot 311, the length direction of the strip-shaped slot 311 is parallel to the length direction of the first connecting rod 310, and the driving cylinder 410 is provided with an articulation rod which is inserted into the strip-shaped slot 311.

[0054] The articulation rod is inserted into the strip-shaped slot 311 and can move along the length direction of the strip-shaped slot 311, so that the driving cylinder 410 is articulated to the first connecting rod 310 and can also be adjusted in a small amplitude along the length direction of the first connecting rod 310, thereby improving the degree of freedom of the driving cylinder 410 and enabling the driving cylinder 410 to smoothly drive the boom assembly 200 to change the amplitude.

[0055] Referring to FIG. 1, Figure 1 It can be understood that the free end of the boom assembly 200 is provided with an auxiliary arm 500, the auxiliary arm 500 is articulated to the boom assembly 200, and a leveling assembly 600 is arranged between the auxiliary arm 500 and the boom assembly 200, which can drive the auxiliary arm 500 to rotate to change the included angle between the auxiliary arm 500 and the boom assembly 200.

[0056] The auxiliary arm 500 is used to install a work platform, such as a work bar for personnel to stand on. The leveling assembly 600 is used to be installed between the auxiliary arm 500 and the boom assembly 200 to level the auxiliary arm 500. When the boom assembly 200 changes the amplitude, the included angle between the auxiliary arm 500 and the horizontal plane will also change, and if the leveling is not performed, the work platform connected to the auxiliary arm 500 will form an included angle with the horizontal plane and gradually increase, which is not conducive to the standing of personnel.

[0057] Referring to FIG. 1, Figure 3 It can be understood that the leveling assembly 600 includes a first leveling cylinder 610, one end of the first leveling cylinder 610 is articulated to the boom assembly 200, and the other end is articulated to the auxiliary arm 500.

[0058] By controlling the first leveling oil cylinder 610 to drive the auxiliary arm 500 to rotate around the hinge point, the leveling operation of the auxiliary arm 500 can be realized.

[0059] It can be understood that the leveling assembly 600 further comprises a second leveling oil cylinder 620, one end of the second leveling oil cylinder 620 is hinged with the connecting rod telescopic assembly 300, the other end is hinged with the arm support assembly 200, a plurality of hydraulic pipes are communicated between the first leveling oil cylinder 610 and the second leveling oil cylinder 620, and the first leveling oil cylinder 610 and the second leveling oil cylinder 620 can feedback to each other.

[0060] The second leveling oil cylinder 620 and the first leveling oil cylinder 610 can feedback to each other, for example, when the arm support assembly 200 is luffing downward, the second leveling oil cylinder 620 will contract, and the first leveling oil cylinder 610 needs to be elongated to drive the auxiliary arm 500 to level.

[0061] The first leveling oil cylinder 610 and the second leveling oil cylinder 620 both have a rodless cavity and a rod cavity, and are internally provided with a movable piston rod. When the pressure of the rodless cavity is greater than that of the rod cavity, the piston rod will be pushed out, and when the pressure of the rod cavity is greater than that of the rodless cavity, the piston rod will be retracted.

[0062] Referring to Figure 7 , the first leveling oil cylinder 610 and the second leveling oil cylinder 620 are communicated with a plurality of hydraulic pipes in order to be able to feedback to each other. After the connection diagram of the hydraulic pipe is simplified, it mainly includes the combination of a one-way valve and a sequence valve, and the communication between the rodless cavity of the first leveling oil cylinder 610 and the rodless cavity of the second leveling oil cylinder 620, and the communication between the rod cavity of the first leveling oil cylinder 610 and the rod cavity of the second leveling oil cylinder 620.

[0063] When the third connecting rod 330 and the upper half of the first connecting rod 310 and the second connecting rod 320 form a diamond structure, combined with the application of the first leveling oil cylinder 610 and the second leveling oil cylinder 620, the inner cavity cross-sectional area of the second leveling oil cylinder 620 can be reduced to about half of the inner cavity cross-sectional area of the first leveling oil cylinder 610 at this time.

[0064] Specifically, when the arm support assembly 200 is in the luffing process, the change amount of the angle with the horizontal plane is c, and when the leveling is not performed, the change amount of the angle of the auxiliary arm 500 with the horizontal plane is also c, referring to Figure 5 , at this time, the first leveling oil cylinder 610 needs to drive the auxiliary arm 500 to move reversely to generate a change amount of the angle b, and the value of b is equal to c. Referring to Figure 6As shown, the second leveling oil cylinder 620 is arranged on the first connecting rod 310, the angle change of the first connecting rod 310 with the boom assembly 200 is a, and a is twice the value of c. The chord length corresponding to the double angle can also be considered as a double relationship, so the piston rod elongation distance of the second leveling oil cylinder 620 is approximately twice that of the first leveling oil cylinder 610. The first leveling oil cylinder 610 and the second leveling oil cylinder 620 are in communication with each other, and the volume of the hydraulic oil is substantially incompressible, so the same volume corresponds to a smaller cross-sectional area under a longer displacement amount, so the cross-sectional area of the inner cavity of the second leveling oil cylinder 620 can be reduced to about half of that of the first leveling oil cylinder 610, thereby reducing the size of the second leveling oil cylinder 620 and saving costs.

[0065] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. An arm swing linkage mechanism characterized by comprising: The utility model relates to a crane, which comprises: a base (100); an arm support assembly (200) provided with an auxiliary arm (500) at a free end of the arm support assembly (200), the auxiliary arm (500) being hinged to the arm support assembly (200), and a leveling assembly (600) being arranged between the auxiliary arm (500) and the arm support assembly (200), the leveling assembly (600) being capable of driving the auxiliary arm (500) to rotate so as to change an included angle between the auxiliary arm (500) and the arm support assembly (200), the leveling assembly (600) comprising a first leveling oil cylinder (610), one end of the first leveling oil cylinder (610) being hinged to the arm support assembly (200) and the other end being hinged to the auxiliary arm (500); a connecting rod telescopic assembly (300) connected between the base (100) and the arm support assembly (200), the connecting rod telescopic assembly (300) forming a scissor structure, the connecting rod telescopic assembly (300) comprising a first connecting rod (310), a second connecting rod (320) and a third connecting rod (330), one end of the first connecting rod (310) being hinged to the base (100) and the other end being hinged to the arm support assembly (200), the second connecting rod (320) being arranged crosswise to the first connecting rod (310) and being hinged at the intersection, one end of the second connecting rod (320) being slidingly connected to the base (100) and the other end being hinged to the third connecting rod (330), the third connecting rod (330) also being hinged to the arm support assembly (200), the third connecting rod (330) being parallel to the first connecting rod (310), and the second connecting rod (320) being parallel to the arm support assembly (200); a driving assembly (400) arranged in the connecting rod telescopic assembly (300), the driving assembly (400) being drivingly connected to the arm support assembly (200) and capable of driving the arm support assembly (200) to move and change amplitude, the driving assembly (400) being a driving cylinder (410) having a telescopic rod (420), the driving cylinder (410) being hinged to the first connecting rod (310), and the movable end of the telescopic rod (420) being hinged to the arm support assembly (200); wherein a sliding groove (110) is formed in the base (100), the guiding direction of the sliding groove (110) being parallel to the amplitude changing plane of the arm support assembly (200), and a sliding block (321) is arranged on the second connecting rod (320), the sliding block (321) being capable of moving along the sliding groove (110) in cooperation with the sliding groove (110); a strip-shaped groove (311) is arranged on the first connecting rod (310), the length direction of the strip-shaped groove (311) being parallel to the length direction of the first connecting rod (310), and the driving cylinder (410) is provided with a hinge rod, the hinge rod being inserted into the strip-shaped groove (311). The leveling assembly (600) further comprises a second leveling oil cylinder (620), one end of the second leveling oil cylinder (620) is hinged with the connecting rod telescopic assembly (300), the other end is hinged with the arm support assembly (200), a plurality of hydraulic pipes are communicated between the first leveling oil cylinder (610) and the second leveling oil cylinder (620), and the first leveling oil cylinder (610) and the second leveling oil cylinder (620) can feedback and adjust each other.

2. The boom luffing linkage of claim 1, wherein: The first connecting rod (310) and the second connecting rod (320) are equal in length, and the intersection points of the first connecting rod (310) and the second connecting rod (320) are the midpoints of the first connecting rod (310) and the second connecting rod (320) respectively, the third connecting rod (330) is half the length of the first connecting rod (310), and the distance between the hinged point of the third connecting rod (330) and the arm support assembly (200) and the hinged point of the first connecting rod (310) and the arm support assembly (200) is equal to the length of the third connecting rod (330).

3. The boom luffing linkage of claim 1, wherein: The telescopic rod (420) coincides with the hinged point of the arm support assembly (200) and the hinged point of the third connecting rod (330) and the arm support assembly (200).

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