The chassis frame of a self-propelled crane

 

(57) Abstract:

The invention relates to construction machinery and can be used in automobile cranes, planners and other road construction equipment. The invention consists in that the chassis frame has a transverse beams and the supporting base node of the longitudinal beam. The base unit is designed in the form of a truncated pyramid with a height equal to the height of the longitudinal beam and the longitudinal beam cross-section is made in the form of a trapezoid. The technical result achieved by the invention is to further increase the rigidity of the lower frame, including the perimeter of a turntable with a minimum frame weight, increase durability and reliability of the frame, simplifying its manufacturing process. 1 C.p. f-crystals, 3 ill.

The invention relates to the field of construction machines and can be used in automobile cranes, planners, lifts and other road construction equipment.

Known chassis frame of the automobile cranes, having a cross-joisting and consisting of two longitudinal and short transverse beams. Two cross-beams are located in the middle of the frame and form together with knee shall see L. C. Hare, M. D. Polosin. Mobile cranes. M.: Vysshaya SHKOLA, 1987, S. 151).

However, this construction of the base node in the navigation frame does not create a rigid base along the perimeter of the SDA. This causes wear rings at SDA in places where you rely on the beams of the base node, its unreliability in operation and low durability.

Known suspension frames with the base node, the closest to the technical essence is the frame in which the base node is made in the form of a truncated cone with a height equal to the height of the longitudinal beams and the angle between the generatrix and its longitudinal axis is: 0<and<45 (patent RU 2081776). A disadvantage of the known device is the complexity of the manufacturing process of the frame and lack of reliability.

The present invention is the simplification of the manufacturing process of the frame and further increase the rigidity of the lower frame including a perimeter plots with minimum weight of the frame increase the durability and reliability of the frame.

The problem is solved in such a way that in the chassis in order to increase the rigidity of the longitudinal beam cross-section has the form of a trapezoid, in the longitudinal cuts the base node, which in its design has will truncate high and uniform along the perimeter of the SDA rigidity. This is because the vertical deformation of the surface of the host, which supports SDA-related stress tension-compression in the wall of the shell, have little value. In the beam structure similar strains have a much greater value, as these relate to stresses in the shelves from bending beams.

In Fig. 1 shows a General view of the chassis frame of a truck crane with a base node in the form of a truncated pyramid, Fig. 2 - the same, front view; Fig. 3 - section a-a in Fig. 2.

The frame consists of transverse beams 1 for outriggers and longitudinal beams 2, has a cross-sectional view of a trapezoid. Seams 3 are used to connect the upper base 4 from the top shelf of the longitudinal beams. In the middle part for technical reasons made the window. The top of the base is attached to the ring 5 for connecting the frame with the node PP. The base node 6 is connected with the longitudinal beam 2, and in the process of manufacturing the frame of a truck crane, there are no complex operations on the formation of the base unit in the form of a truncated cone, because the base unit is formed from individual elements that form the faces of a truncated pyramid.

In addition, it reduces the initial voltage at the base node due to the replacement of the a-line greatly increases the reliability of the frame.

1. The chassis frame of a self-propelled crane, containing the transverse beams and the supporting base node of the longitudinal beam, wherein the base node is made in the form of a truncated pyramid with a height equal to the height of the longitudinal beams.

2. The chassis frame under item 1, characterized in that the longitudinal beam cross-section is made in the form of a trapezoid.

 

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