A square arm

Abstract

This invention belongs to the field of tower cranes and discloses a square arm, including a pair of side-by-side upper truss main members and a pair of side-by-side lower truss main members. The upper and lower truss main members form a square column frame structure. Adjacent upper truss main members, adjacent lower truss main members, and adjacent upper and lower truss main members are all connected by reinforcing bars. Each upper truss main member is formed by bending a first profile. One end of each of the two upper truss main members is an asymptotic end, and the other end is a parallel end. The asymptotic ends of the two upper truss main members converge at one point and are connected by a connector. The side of the square arm that connects to the tripod is formed by bending two first profiles, such as round steel, to form a triangular structure, thus achieving the connection with the tripod. This eliminates the need for large-area cutting and welding required in traditional solutions, simplifies production, and can reduce equipment weight by hundreds of kilograms.

Description

Technical Field

[0001] This invention relates to the field of tower cranes, and in particular to a square boom. Background Technology

[0002] CN201820938498.X discloses a screw square frame, including a square frame body. The square frame body is provided with truss ports at both ends. The four corners of the truss ports are provided with arc-shaped grooves in a rectangular shape. The arc-shaped grooves are engaged with the main truss tubes. The adjacent truss tubes are spaced at equal intervals with truss vertical tubes. The square frame body is provided with inclined truss support tubes on both sides. The truss support tubes are connected to the truss ports with support tubes. The middle of both ends of the truss ports are welded to the truss vertical tubes.

[0003] The case revealed the use of a square frame. Not all parts of the tower crane's boom are square frames; at the lifting end of the boom, a triangular frame with a triangular cross-section along the vertical plane is typically used. The connection between the triangular frame and the square frame is as follows: the upper truss main member of the square frame needs to transition to the triangular frame. During this transition, to ensure even stress distribution, the traditional method is to connect the square frame and the triangular frame using a triangular plate (C). This triangular plate consists of two steel plates, one above the other, with a hollowed-out section forming a triangular frame. For example... Figure 1 shown.

[0004] The drawback of this approach is that the triangular frame requires cutting and extensive welding, which is a huge waste of manpower and resources.

[0005] Therefore, the primary problem that this technical solution aims to solve is: how to achieve a stable connection between tripods and square frames while saving manpower and resources. Summary of the Invention

[0006] The purpose of this invention is to provide a square arm, on which the side connecting to the tripod is formed by bending two round steel bars to form a triangular structure, thereby achieving the connection with the tripod. This eliminates the need for large-area cutting and welding required in traditional solutions, simplifies production, and can reduce equipment weight by hundreds of kilograms.

[0007] The technical solution provided by this invention is as follows: a square arm, comprising a pair of upper truss main members arranged side by side and a pair of lower truss main members arranged side by side, the upper truss main members and the lower truss main members forming a square column frame structure, the adjacent upper truss main members, the adjacent lower truss main members, and the upper and lower adjacent upper truss main members and lower truss main members are all connected by reinforcing rods, the upper truss main members are formed by bending a first profile; one end of the two upper truss main members is an asymptotic end and the other end is a parallel end, the asymptotic ends of the two upper truss main members converge at one point and are connected by a connector.

[0008] The first profile is a steel rod with a circular, elliptical, or square cross-section.

[0009] It should be noted that the shape and structure of the first profile do not require strict restrictions, but they must meet basic strength requirements. For example, if the first profile is a hollow tube, its wall thickness must be relatively thick to provide sufficient support strength. If the first profile is a solid round steel bar, its diameter can be smaller. Therefore, the selection of materials for the first profile does not require many restrictions; the only restriction is that it must have sufficient strength and not deform or bend during use.

[0010] In the aforementioned quadrilateral arm, the connector is located on the horizontal perpendicular line of the line connecting the parallel ends of the two upper truss main members.

[0011] In the aforementioned quadrilateral arm, the connecting member includes an upper connecting plate, a lower connecting plate, and a U-shaped plate. One end of the U-shaped plate is welded to the upper surface of the upper connecting plate, and the other end of the U-shaped plate is welded to the lower surface of the lower connecting plate. The asymptotic ends of the two upper truss main members are welded between the upper connecting plate and the lower connecting plate.

[0012] In the aforementioned quadrilateral arm, the U-shaped plate and the lower truss main member are connected by a connecting rod.

[0013] In the aforementioned quadrature arm, the lower truss main member is a second profile, which is one of square steel pipe, square steel column, round steel pipe, or round steel column.

[0014] In the aforementioned quadrilateral arm, the reinforcing rod is made of round steel, and the reinforcing rod is welded to the lower truss main rod and the upper truss main rod via connecting lugs.

[0015] The beneficial effects of this invention after adopting the above technical solution are as follows:

[0016] This solution replaces the main upper truss of the square frame with a single profile, such as round steel. One end of the round steel is bent into a triangular structure, which converges at a point and is connected by connectors. This replaces the steel plate that needs to be cut into triangles in the traditional solution, effectively saving manpower and resources and reducing product weight. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the square arm in the background art of this invention;

[0018] Figure 2 This is a perspective view of Embodiment 1 of the present invention;

[0019] Figure 3 This is the front view of the tripod of the present invention. Detailed Implementation

[0020] The technical solution of the present invention will be further described in detail below with reference to specific embodiments, but this does not constitute any limitation on the present invention.

[0021] Example 1:

[0022] like Figure 2-3 As shown, a quadrangular arm includes a pair of side-by-side upper truss main members 1 and a pair of side-by-side lower truss main members 2. The upper truss main members 1 and the lower truss main members 2 form a quadrangular column frame structure. The adjacent upper truss main members 1, the adjacent lower truss main members 2, and the upper and lower adjacent upper truss main members 1 and lower truss main members 2 are all connected by reinforcing rods 3. The upper truss main member 1 is formed by bending a round steel bar. One end of the two upper truss main members 1 is an asymptotic end B and the other end is a parallel end A. The asymptotic ends B of the two upper truss main members 1 converge at one point and are connected by a connector 4.

[0023] In this embodiment, the progressive ends converge at connector 4, forming a pointed tip, which is connected to connector 4 on the tripod. The tripod is as follows: Figure 3 As shown, its upper chord D is connected to the connector 4.

[0024] The advantages of doing this are: compared to cutting two steel plates to form a triangular structure, it does not require welding between itself and the main upper truss of the square frame, resulting in a complete structure and uniform stress distribution; it is also lighter in weight; and its processing is simple, effectively reducing manpower and material resources.

[0025] Preferably, the connector 4 is located on the horizontal perpendicular line of the line connecting the parallel ends A of the two upper truss main members 1.

[0026] Preferably, the connector 4 includes an upper connecting plate 41, a lower connecting plate 42, and a U-shaped plate 43. One end of the U-shaped plate 43 is welded to the upper surface of the upper connecting plate 41, and the other end of the U-shaped plate 43 is welded to the lower surface of the lower connecting plate 42. The asymptotic ends B of the two upper truss main rods 1 are welded between the upper connecting plate 41 and the lower connecting plate 42. Of course, this embodiment does not exclude other connection methods, but this connector 4 is a common connector 4 in the tower crane field, and its structural stability and reliability have been widely tested in use.

[0027] In this embodiment, the U-shaped plate 43 and the lower truss main rod 2 are connected by a connecting rod 5, and the lower truss main rod 2 is a square steel tube. In practical applications, the lower truss main rod 2 can also be a solid square steel, round steel, etc.

[0028] In a preferred embodiment, the reinforcing rod 3 is made of round steel, and the reinforcing rod 3 is welded to the lower truss main rod 2 and the upper truss main rod 1 via connecting lugs 6.

[0029] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A square arm comprising a pair of upper truss main members arranged side by side and a pair of lower truss main members arranged side by side, wherein the upper and lower truss main members form a square column frame structure, and adjacent upper truss main members, adjacent lower truss main members, and adjacent upper and lower truss main members are all connected by reinforcing members, characterized in that, The upper truss main member is formed by bending a first profile; one end of the two upper truss main members is an asymptotic end and the other end is a parallel end, and the asymptotic ends of the two upper truss main members converge at one point and are connected by a connector; The connector includes an upper connecting plate, a lower connecting plate, and a U-shaped plate. One end of the U-shaped plate is welded to the upper surface of the upper connecting plate, and the other end of the U-shaped plate is welded to the lower surface of the lower connecting plate. The asymptotic ends of the two upper truss main members are welded between the upper connecting plate and the lower connecting plate.

2. The quadrilateral arm according to claim 1, characterized in that, The connector is located on the horizontal perpendicular line of the line connecting the parallel ends of the two upper truss main members.

3. The quadrilateral arm according to claim 1, characterized in that, The U-shaped plate and the main lower truss are connected by a connecting rod.

4. The quadrilateral arm according to claim 1, characterized in that, The lower truss main member is a second profile, which is one of square steel pipe, square steel column, round steel pipe, or round steel column.

5. The quadrilateral arm according to claim 1, characterized in that, The reinforcing rod is made of round steel, and it is welded to the lower truss main rod and the upper truss main rod via connecting lugs.

6. The quadrilateral arm according to any one of claims 1-5, characterized in that, The first profile is a steel rod with a circular, elliptical, or square cross-section.

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